阅读说明：本技术 光学构件和包括光学构件的显示设备 (Optical member and display apparatus including the same ) 是由 张润 尹炳瑞 于 2019-05-24 设计创作，主要内容包括：本申请涉及光学构件和显示设备,光学构件包括导光板、低折射率层、第一光学图案层和第二光学图案层,其中,低折射率层设置在导光板的顶表面上；第一光学图案层设置在导光板的底表面上；第二光学图案层设置为覆盖导光板的光入射表面。第二光学图案层包括聚焦透镜结构。(The present application relates to an optical member and a display apparatus, the optical member including a light guide plate, a low refractive index layer, a first optical pattern layer, and a second optical pattern layer, wherein the low refractive index layer is disposed on a top surface of the light guide plate; the first optical pattern layer is arranged on the bottom surface of the light guide plate; the second optical pattern layer is disposed to cover the light incident surface of the light guide plate. The second optical pattern layer includes a focusing lens structure.)

1. An optical member comprising:

A light guide plate;

A low refractive index layer disposed on a top surface of the light guide plate;

A first optical pattern layer disposed on a bottom surface of the light guide plate; and

A second optical pattern layer disposed to cover a light incident surface of the light guide plate,

Wherein the second optical pattern layer comprises a focusing lens structure.

2. the optical member according to claim 1,

The second optical pattern layer comprises a base layer and a pattern layer arranged on the base layer; and

the pattern layer has a convex surface and a plurality of uneven patterns to form the focusing lens structure.

3. The optical member according to claim 2,

The convex surface is arranged to overlap with the center of the pattern layer; and

The uneven patterns are arranged in series at a constant interval from both edges of the convex surface.

4. The optical member according to claim 3, wherein the focusing lens structure formed by the convex surface of the pattern layer and the uneven pattern is a Fresnel lens structure.

5. the optical component of claim 4 wherein the Fresnel lens structure is a linear Fresnel lens structure.

6. The optical member according to claim 5, further comprising:

A wavelength converting layer disposed on a top surface of the low refractive index layer,

Wherein the content of the first and second substances,

The second optical pattern layer is arranged to further cover the first side of the wavelength conversion layer; and

The first side of the wavelength converting layer is aligned with the light incident surface.

7. The optical member according to claim 6, further comprising:

An adhesive tape layer covering an opposite surface of the light guide plate opposite to the light incident surface,

Wherein the adhesive tape layer comprises a light reflective material.

8. The optical member according to claim 7,

The adhesive tape layer is arranged to cover a second side of the wavelength conversion layer opposite to the first side of the wavelength conversion layer; and

The second side of the wavelength converting layer is aligned with the opposing face.

9. The optical member as claimed in claim 8, wherein the adhesive tape layer is disposed to cover all sides of the light guide plate except the light incident surface.

10. The optical member of claim 9, wherein the second optical pattern layer and the tape layer are in contact with each other.

11. The optical member as set forth in claim 8, wherein the second optical pattern layer comprises:

a first folding surface extending from one side of the light incident surface to cover a top surface of the wavelength conversion layer; and

A second folding surface extending from the other side of the light incident surface to cover a bottom surface of the first optical pattern layer.

12. The optical member of claim 11, wherein the tape layer comprises:

A third folded surface extending from one side of the opposing face to cover a top surface of the wavelength converting layer; and

a fourth folded surface extending from the other side of the opposite face to cover a bottom surface of the first optical pattern layer.

13. The optical member as claimed in claim 5, wherein the second optical pattern layer is disposed to further cover a side portion of the first optical pattern layer.

14. The optical component according to claim 4, wherein the Fresnel lens structure is a circular Fresnel lens structure.

15. The optical member as claimed in claim 14, wherein the second optical pattern layer comprises a fresnel lens array having a plurality of circular fresnel lens structures.

16. A display device, comprising:

An optical member comprising:

A light guide plate;

A low refractive index layer disposed on a top surface of the light guide plate;

A wavelength converting layer disposed on a top surface of the low refractive index layer;

A first optical pattern layer disposed on a bottom surface of the light guide plate; and

A second optical pattern layer disposed to cover a light incident surface of the light guide plate, the second optical pattern layer including a focusing lens structure;

a light source disposed on at least one side of the light guide plate; and

a display panel disposed over the optical member.

17. The display device of claim 16,

the light source is configured to emit blue light; and

The wavelength conversion layer includes:

A first wavelength conversion particle converting the blue light into red light; and

Second wavelength converting particles converting the blue light into green light.

18. The display device of claim 17, wherein the focusing lens structure is a linear fresnel lens structure.

19. The display device of claim 18,

the second optical pattern layer is arranged to further cover the first side of the wavelength conversion layer; and

The first side of the wavelength converting layer is aligned with the light incident surface.

20. The display device of claim 19, further comprising:

An adhesive tape layer covering an opposite surface of the light guide plate opposite to the light incident surface,

Wherein the content of the first and second substances,

The tape layer comprises a light reflective material and is disposed to further cover a second side of the wavelength converting layer opposite the first side of the wavelength converting layer; and

The second side of the wavelength converting layer is aligned with the opposing face.

Technical Field

Exemplary embodiments of the present invention relate generally to an optical member and a display apparatus including the same, and more particularly, to an optical member including a light guide plate and a Liquid Crystal Display (LCD) apparatus including the same.

Background

A Liquid Crystal Display (LCD) device receives light from a backlight assembly and displays an image using the received light. The backlight assembly includes a light source and a light guide plate. The light guide plate receives light provided through the light source and guides the received light to propagate toward the display panel. The light provided through the light source may be white light, and the white light may be filtered through a filter provided in the display panel, thereby implementing various colors. In order to improve picture quality (e.g., color reproducibility) of the LCD device, research has been conducted on ways of applying wavelength conversion materials. In general, a blue light source may be used as the light source, and a wavelength conversion material may be disposed over the light guide plate to convert the blue light into white light.

The angular distribution of light guided by a light guide plate using the total reflection phenomenon is determined by the difference in refractive index at the interface. The smaller the difference in refractive index at the interface, the larger the critical angle for total reflection. Therefore, light incident at an angle smaller than the critical angle for total reflection is not completely reflected, and thus is not guided by the light guide plate.

The above information disclosed in this background section is only for background understanding of the inventive concept and, therefore, it may contain information that does not constitute prior art.

Disclosure of Invention

Exemplary embodiments of the present invention provide an optical member capable of improving luminance of a display device by improving light leakage at a light incident portion.

Exemplary embodiments of the present invention also provide a display device including an optical member capable of improving light leakage at a light incident portion.

Additional features of the inventive concept will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the inventive concept.

Exemplary embodiments of the present invention provide an optical member including a light guide plate, a low refractive index layer, a first optical pattern layer, and a second optical pattern layer, wherein the low refractive index layer is disposed on a top surface of the light guide plate; the first optical pattern layer is arranged on the bottom surface of the light guide plate; the second optical pattern layer is disposed to cover the light incident surface of the light guide plate. The second optical pattern layer includes a focusing lens structure.

Another exemplary embodiment of the present invention provides a display apparatus including an optical member, a light source, and a display panel, wherein the optical member includes a light guide plate, a low refractive index layer, a wavelength conversion layer, a first optical pattern layer, and a second optical pattern layer, the low refractive index layer being disposed on a top surface of the light guide plate, the wavelength conversion layer being disposed on a top surface of the low refractive index layer, the first optical pattern layer being disposed on a bottom surface of the light guide plate, the second optical pattern layer being disposed to cover a light incident surface of the light guide plate, the second optical pattern layer including a focusing lens structure; the light source is arranged on at least one side of the light guide plate; the display panel is disposed over the optical member.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the inventive concept.

Fig. 1 is a perspective view illustrating an optical member and a light source according to an exemplary embodiment of the present invention.

fig. 2 is a sectional view taken along line II-II' of fig. 1.

Fig. 3 and 4 are cross-sectional views of exemplary low refractive index layers.

Fig. 5 is an enlarged perspective view of the optical member of fig. 1.

FIG. 6 is a cross-sectional view of an exemplary second optically patterned layer taken along line VI-VI' of FIG. 5.

Fig. 7 is a cross-sectional view illustrating a path of light passing through the second optical pattern layer of fig. 6.

Fig. 8 is a cross-sectional view of another exemplary second optical pattern layer.

Fig. 9 is a cross-sectional view of another exemplary second optical pattern layer.

Fig. 10 and 11 are perspective views of other exemplary second optical pattern layers.

Fig. 12 and 13 are perspective views of the parent stack structure before and after being cut into nine equal pieces.

fig. 14, 15 and 16 are perspective views of a single stack structure obtained from the parent stack structure of fig. 12 and 13.

Fig. 17, 18, 19, 20 and 21 are sectional views of optical members according to other exemplary embodiments of the present invention.

Fig. 22 is a sectional view of a display apparatus according to an exemplary embodiment of the present invention.

Detailed Description

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the exemplary embodiments of the invention. As used herein, an "embodiment" is a non-limiting example of an apparatus or method that applies one or more of the inventive concepts disclosed herein. It may be evident, however, that the various exemplary embodiments may be practiced without these specific details or with one or more equivalent arrangements. In other instances, well-known structures and devices are shown in block diagram form in order to avoid unnecessarily obscuring the various exemplary embodiments. Moreover, the exemplary embodiments may be different, but are not necessarily exclusive. For example, the particular shapes, configurations and characteristics of the exemplary embodiments may be used or practiced in another exemplary embodiment without departing from the inventive concept.

The exemplary embodiments shown, unless otherwise indicated, are understood to provide exemplary features of varying detail of some ways in which the inventive concepts may be practiced. Thus, unless otherwise indicated, features, components, modules, layers, films, panels, regions, and/or aspects and the like (hereinafter referred to individually or collectively as "elements") of the various embodiments may be otherwise combined, separated, interchanged, and/or rearranged without departing from the inventive concepts.

the use of cross-hatching and/or shading in the drawings is generally employed to clarify the boundaries between adjacent elements. As such, the presence or absence of cross-sectional lines or shading, unless otherwise indicated, does not convey or indicate any preference or requirement for a particular material, material property, dimension, proportion, commonality between the illustrated elements, and/or for any other characteristic, property, etc. of an element. Further, in the drawings, the size and relative sizes of elements may be exaggerated for clarity and descriptive purposes. When the exemplary embodiments may be implemented differently, the particular sequence of processes may be performed differently than described. For example, two processes described in succession may be executed substantially concurrently or in the reverse order to that described. In addition, like reference numerals denote like elements.

when an element such as a layer is referred to as being on, connected to, or coupled to another element or layer, it may be directly on, connected to, or coupled to the other element or layer, or intervening elements or layers may be present. However, when an element or layer is referred to as being directly on, directly connected to, or directly coupled to another element or layer, there are no intervening elements or layers present. To this end, the term "connected" may mean physically, electrically, and/or fluidically connected, with or without intervening elements. Further, the D1 axis, D2 axis, and D3 axis are not limited to three axes of a rectangular coordinate system, such as an x-axis, a y-axis, and a z-axis, and may be explained in a broader sense. For example, the D1, D2, and D3 axes may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purposes of this disclosure, "at least one of X, Y and Z" and "at least one selected from the group consisting of X, Y and Z" can be understood as X only, Y only, Z only, or any combination of two or more of X, Y and Z, such as XYZ, XYY, YZ, and ZZ. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Although the terms first, second, etc. may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first element discussed below could be termed a second element without departing from the teachings of the present disclosure.

Spatially relative terms, such as "below," "lower," "upper," "higher," "side" (e.g., as in "side walls"), and the like, may be used herein for descriptive purposes and thus to describe one element's relationship to another element as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. Moreover, the devices may be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and, as such, the spatially relative descriptors used herein should be interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, the terms "comprises," "comprising," "including," "includes" and/or "including" when used in this specification specify the presence of stated features, integers, steps, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and as such are used to set aside margins for inherent deviations in measured, calculated, and/or provided values that would be recognized by one of ordinary skill in the art.

exemplary embodiments are described herein with reference to cross-sectional and/or exploded views as illustrations of idealized exemplary embodiments and/or intermediate structures. Thus, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, example embodiments disclosed herein should not necessarily be construed as limited to the shapes of regions specifically illustrated, but are to include deviations in shapes that result, for example, from manufacturing. In this manner, the regions illustrated in the figures may be schematic in nature and the shapes of these regions may not reflect the actual region shape of the device and are, therefore, not necessarily intended to be limiting.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. Unless explicitly defined as such herein, terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.

Fig. 1 is a perspective view illustrating an optical member and a light source according to an exemplary embodiment of the present invention. Fig. 2 is a sectional view taken along line II-II' of fig. 1.

Referring to fig. 1 and 2, the optical member 100 includes a light guide plate 10, a low refractive index layer 20 disposed on the light guide plate 10, a wavelength conversion layer 30 disposed on the low refractive index layer 20, a passivation layer 40 disposed on the wavelength conversion layer 30, a first optical pattern layer 50 disposed under the light guide plate 10, and a second optical pattern layer 60 disposed on a side surface of the light guide plate 10. The light guide plate 10, the low refractive index layer 20, the wavelength conversion layer 30, the passivation layer 40, and the first optical pattern layer 50 may be integrally combined to form the stack structure 11. The second optical pattern layer 60 may cover one side of the stack structure 11. In this case, the top surface of the stack structure 11 corresponds to the top surface 40a of the passivation layer 40, and the bottom surface of the stack structure 11 corresponds to the bottom surface 50b of the first optical pattern layer 50.

The light guide plate 10 guides a path of light. The light guide plate 10 may be substantially in the shape of a polygonal column. The planar shape of the light guide plate 10 may be a rectangle, but the inventive concept is not limited thereto. In one exemplary embodiment, the light guide plate 10 may be formed as a hexagonal column having a rectangular planar shape, and may have a top surface 10a, a bottom surface 10b, and four sides, i.e., a first side 10s1, a second side 10s2, a third side 10s3, and a fourth side 10s4, respectively. The first side 10s1, the second side 10s2, the third side 10s3 and the fourth side 10s4 will hereinafter be collectively referred to as sides 10s as required.

In one exemplary embodiment, each of the top surface 10a and the bottom surface 10b of the light guide plate 10 is disposed on a single plane, and planes in which the top surface 10a and the bottom surface 10b are located may be substantially parallel to each other such that the light guide plate 10 may generally have a uniform thickness. However, the inventive concept is not limited to this exemplary embodiment. In other words, alternatively, each of the top surface 10a and the bottom surface 10b may fall on a plurality of planes, and the planes in which the top surface 10a and the bottom surface 10b are located may intersect with each other. For example, if the light guide plate 10 is formed as a wedge, the thickness of the light guide plate 10 may gradually decrease from one side (e.g., a light incident surface) to the other side (e.g., an opposite surface). In another example, the bottom surface 10b may be inclined upward from one side (e.g., a light incident surface) to the other side (e.g., an opposite surface) such that the thickness of the light guide plate 10 is gradually reduced, and then may extend parallel to the top surface 10a such that the thickness of the light guide plate 10 becomes uniform.

The light source 400 may be disposed adjacent to at least one side of the light guide plate 10. A plurality of Light Emitting Diodes (LEDs) 410 may be disposed adjacent to the first side portion 10s1 corresponding to one of the long sides of the light guide plate 10, but the inventive concept is not limited thereto. For example, the LEDs 410 may be disposed adjacent to the first and third side portions 10s1 and 10s3 corresponding to the long side of the light guide plate 10, or adjacent to both the second and fourth side portions 10s2 and 10s4 corresponding to the short side of the light guide plate 10. In the exemplary embodiment of fig. 1, the first side portion 10s1 (to which the light source 400 is disposed) of the light guide plate 10 may become a light incident surface, and the third side portion 10s3 opposite to the first side portion 10s1 may become an opposite surface.

The LED 410 may emit blue light. In other words, the light emitted from the LED 410 may be light having a blue wavelength band. In one exemplary embodiment, the peak wavelength band of the blue light emitted from the LED 410 may be 400nm to 500 nm. Blue light emitted from the LED 410 may enter the light guide plate 10 through the light incident surface 10s 1.

The light guide plate 10 may include an inorganic material. For example, the light guide plate 10 may be formed of glass, but the inventive concept is not limited thereto.

the low refractive index layer 20 is disposed on the top surface 10a of the light guide plate 10. The low refractive index layer 20 may be directly formed on the top surface 10a of the light guide plate 10, and thus may be in contact with the top surface 10a of the light guide plate 10. The low refractive index layer 20 is interposed between the light guide plate 10 and the wavelength conversion layer 30, and contributes to total reflection of light within the light guide plate 10.

In particular, in order for the light guide plate 10 to effectively guide light from the light incident surface 10s1 to the opposite surface 10s3, it may be preferable that effective total internal reflection is required at the top surface 10a and the bottom surface 10b of the light guide plate 10. One of the conditions for generating total internal reflection in the light guide plate 10 is: the refractive index of the light guide plate 10 is greater than that of a medium forming an optical interface with the light guide plate 10. The lower the refractive index of the medium forming the optical interface with the light guide plate 10, the smaller the critical angle for total reflection, and the more total internal reflection will occur.

for example, in the case where the light guide plate 10 is formed of glass having a refractive index of about 1.5, since the bottom surface 10b of the light guide plate 10 is exposed and thus forms an optical interface with an air layer having a refractive index of about 1, sufficient total reflection may occur in the light guide plate 10.

On the other hand, since the optically functional layers are integrally stacked on the top surface 10a of the light guide plate 10, total reflection may not sufficiently occur at the top surface 10a of the light guide plate 10. For example, if a material layer having a refractive index of 1.5 or more is stacked on the top surface 10a of the light guide plate 10, total reflection may not occur at the top surface 10a of the light guide plate 10. Further, if a material layer having a refractive index of, for example, 1.49 (slightly less than the refractive index of the light guide plate 10) is stacked on the top surface 10a of the light guide plate 10, total internal reflection may occur at the top surface 10a of the light guide plate 10, but the total internal reflection is insufficient because the critical angle for total reflection is too large. The wavelength conversion layer 30 stacked on the top surface 10a of the light guide plate 10 may generally have a refractive index of about 1.5. Therefore, if the wavelength conversion layer 30 is directly formed on the top surface 10a of the light guide plate 10, total reflection may not sufficiently occur at the top surface 10a of the light guide plate 10.

The low refractive index layer 20 interposed between the light guide plate 10 and the wavelength conversion layer 30 and forming an interface with the top surface 10a of the light guide plate 10 has a lower refractive index than the light guide plate 10, and thus allows total reflection to occur at the top surface 10a of the light guide plate 10. In addition, the low refractive index layer 20 has a lower refractive index than the wavelength conversion layer 30 (which is a material layer disposed on the low refractive index layer 20), and therefore, more total reflection is allowed to occur than when the wavelength conversion layer 30 is disposed directly on the top surface 10a of the light guide plate 10.

The difference between the refractive index of the light guide plate 10 and the refractive index of the low refractive index layer 20 may be 0.2 or more. In this case, the total reflection may sufficiently occur via the top surface 10a of the light guide plate 10. The upper limit of the difference between the refractive index of the light guide plate 10 and the refractive index of the low refractive index layer 20 is not particularly limited, but may be 1 or less.

The low refractive index layer 20 may have a refractive index of 1.2 to 1.4. Generally, as the refractive index of a solid medium becomes closer to 1, the manufacturing cost of the solid medium is multiplied. If the refractive index of the low refractive index layer 20 is 1.2 or more, the manufacturing cost of the optical member 100 can be prevented from excessively increasing. In addition, the refractive index of the low refractive index layer 20 may preferably be 1.4 or less to sufficiently reduce a critical angle for total reflection at the top surface 10a of the light guide plate 10. In one exemplary embodiment, the low refractive index layer 20 may have a refractive index of about 1.24.

In order to have such a low refractive index, the low refractive index layer 20 may include voids. The voids may be vacuum or may be filled with a layer of air or gas. The voids may be defined by particles and/or a matrix, and this will be described below with reference to fig. 3 and 4.

fig. 3 and 4 are cross-sectional views of exemplary low refractive index layers.

in one exemplary embodiment, as shown in fig. 3, the low refractive index layer 20 may include a plurality of particles PT, a matrix MX surrounding the particles PT, and voids VD. The particles PT may be fillers for controlling the refractive index and mechanical strength of the low refractive index layer 20.

The particles PT may be dispersed in the matrix MX, and the voids VD may be formed in the gaps of the matrix MX. For example, the voids VD may be formed in the matrix MX by mixing the particles PT and the matrix MX in a solvent and drying and/or curing the mixture to evaporate the solvent.

In another exemplary embodiment, as shown in fig. 4, the low refractive index layer 20 may include the matrix MX and the voids VD without particles. For example, the low refractive index layer 20 may include a matrix MX such as a foamed resin and a plurality of voids VD disposed in the matrix MX.

In the case where the low refractive index layer 20 includes the voids VD, as shown in fig. 3 and 4, the total refractive index of the low refractive index layer 20 may be in a range between the refractive index of the particles PT or the matrix MX and the refractive index of the voids VD. As already mentioned above, if the voids VD are vacuum having a refractive index of 1 or filled with an air layer or a gas having a refractive index of about 1, the total refractive index of the low refractive index layer 20 may become 1.4 or less, for example, about 1.25 even if the particles PT or the matrix MX are formed of a material having a refractive index of 1.4 or more. In an exemplary embodiment, the particles PT may be made of, for example, SiO₂、Fe₂O₃Or MgF₂And the matrix MX may be formed of an organic material such as polysiloxane. However, the materials of the particles PT and the matrix MX are not particularly limited.

Referring again to fig. 1 and 2, the thickness of the low refractive index layer 20 may be 0.4 μm to 2 μm. If the thickness of the low refractive index layer 20 is 0.4 μm or more, which corresponds to a wavelength band of visible light, the low refractive index layer 20 may form an effective optical interface with the top surface 10a of the light guide plate 10, and as a result, total reflection may suitably occur at the top surface 10a of the light guide plate 10 according to Snell's law. If the low refractive index layer 20 is too thick, the optical member 100 may also become too thick, the manufacturing cost of the optical member 100 may increase, and the luminance of the optical member 100 may decrease. Accordingly, the low refractive index layer 20 may have a thickness of 2 μm or less.

in one exemplary embodiment, the low refractive index layer 20 may cover most of the top surface 10a of the light guide plate 10, but may partially expose the edge of the light guide plate 10. In other words, the side 10s of the light guide plate 10 may protrude beyond the side of the low refractive index layer 20. The portion of the top surface 10a exposed through the low refractive index layer 20 may provide a space in which the side of the low refractive index layer 20 may be securely covered by the passivation layer 40.

In another exemplary embodiment, the low refractive index layer 20 may cover the entire top surface 10a of the light guide plate 10. The side of the low refractive index layer 20 may be aligned with the side 10s of the light guide plate 10. The differences between these exemplary embodiments may be caused by the manufacturing process of the light guide plate 10. This will be described later with reference to fig. 12 to 16.

The low refractive index layer 20 may be formed by coating. For example, the low refractive index layer 20 may be formed by coating a composition for forming the low refractive index layer 20 on the top surface 10a of the light guide plate 10 and drying and curing the composition. The composition may be coated on the top surface 10a of the light guide plate 10 by slit coating, spin coating, roll coating, spray coating, or inkjet coating, but the present disclosure is not limited thereto. In other words, the composition may be coated on the top surface 10a of the light guide plate 10 using various methods other than the methods set forth herein.

Although not specifically illustrated, a barrier layer may also be disposed between the low refractive index layer 20 and the light guide plate 10. The blocking layer may cover the entire top surface 10a of the light guide plate 10. The side of the barrier layer may be aligned with the side 10s of the light guide plate 10. The low refractive index layer 20 may be formed in contact with the top surface of the barrier layer. The low refractive index layer 20 may partially expose the edge of the barrier layer.

Like the passivation layer 40, the barrier layer prevents the penetration of moisture and/or oxygen. The barrier layer may comprise an inorganic material. For example, the barrier layer may include silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride, or a metal film having light transmittance. The barrier layer may be formed of the same material as the passivation layer 40, but the present disclosure is not limited thereto. The barrier layer may be formed by deposition, such as Chemical Vapor Deposition (CVD).

The wavelength conversion layer 30 is disposed on the top surface 20a of the low refractive index layer 20. The wavelength conversion layer 30 converts the wavelength of at least a portion of the light incident thereon. The wavelength conversion layer 30 may include a binder layer and wavelength conversion particles dispersed in the binder layer. The wavelength conversion layer 30 may also include scattering particles dispersed in the binder layer.

The binder layer, which is a medium in which the wavelength conversion particles are dispersed, may be formed of various resin compositions, which may be generally referred to as binders, but the inventive concept is not limited thereto. Almost any type of medium in which the wavelength converting particles and/or scattering particles may be dispersed may be referred to as a binder layer, regardless of its actual name, additional function, and composition.

The wavelength conversion particles may be, for example, Quantum Dots (QDs), fluorescent materials, or phosphorescent materials as the particles for converting the wavelength of incident light. QDs are materials with nanoscale crystalline structures and are composed of hundreds to thousands of atoms. Due to the small size of the QDs, the band gap increases, i.e., a quantum confinement effect occurs. In response to light having energy higher than the energy band gap being incident on the QDs, the QDs absorb the incident light to be excited, emit light having a specific wavelength, and then fall to a ground state. Light emitted by the QDs has a value corresponding to the energy band gap. The emission characteristics of QDs due to quantum confinement can be controlled by adjusting the size and composition of the QDs.

The QDs may include at least one of: for example, group II-VI compounds, group II-V compounds, group III-VI compounds, group III-V compounds, group IV-VI compounds, group I-III-VI compounds, group II-IV-VI compounds, and group II-IV-V compounds.

Each of the QDs may include a core and a shell that coats the core. The core may include at least one of: example (b)Such as CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InP, InAs, InSb, SiC, Ca, Se, In, P, Fe, Pt, Ni, Co, Al, Ag, Au, Cu, FePt, Fe₂O₃、Fe₃O₄Si and Ge. The housing may comprise at least one of: for example, ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgSe, HgTe, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, GaSe, InN, InP, InAs, InSb, TiN, TiP, TiAs, TiSb, PbS, PbSe, and PbTe.

The wavelength converting particles may include various combinations of wavelength converting particles that convert incident light to light having different wavelengths. For example, the wavelength converting particles may include first wavelength converting particles that convert incident light having a specific wavelength into light having a first wavelength and second wavelength converting particles that convert incident light having a specific wavelength into light having a second wavelength. In one exemplary embodiment, the light emitted from the light source 400 incident on the wavelength conversion particles may be blue wavelength light, the first wavelength may be green wavelength, and the second wavelength may be red wavelength. For example, a blue wavelength may have a peak in the range of 420nm to 470nm, a green wavelength may have a peak in the range of 520nm to 570nm, and a red wavelength may have a peak in the range of 620nm to 670 nm. However, the disclosed blue, green, and red wavelengths are not particularly limited and should be understood to include all bands commonly perceived as blue, green, and red wavelengths.

In this exemplary embodiment, a portion of the blue light incident on the wavelength conversion layer 30 may encounter the first wavelength conversion particles to be converted into and emitted through the wavelength conversion layer 30 as green light, a portion of the blue light incident on the wavelength conversion layer 30 may encounter the second wavelength conversion particles to be converted into and emitted through the wavelength conversion layer 30 as red light, and a portion of the blue light incident on the wavelength conversion layer 30 may be emitted as it is without encountering the first wavelength conversion particles or the second wavelength conversion particles. Accordingly, the light transmitted through the wavelength conversion layer 30 may include all of the blue wavelength light, the green wavelength light, and the red wavelength light. By appropriately controlling the ratio of emitted light having different wavelengths, white light or light having various colors can be displayed. The light beam converted by the wavelength conversion layer 30 is concentrated on a narrow wavelength band and thus has a sharp spectrum with a narrow half width. Therefore, by obtaining a color by filtering light having such a spectrum through a filter, color reproducibility can be improved.

In another exemplary embodiment, the incident light may be short-wavelength light such as Ultraviolet (UV) light, and three combinations of wavelength conversion particles that convert the short-wavelength light into blue-wavelength light, green-wavelength light, and red-wavelength light may be disposed in the wavelength conversion layer 30 to emit white light.

The wavelength conversion layer 30 may also include scattering particles. The scattering particles other than the QDs may be particles having no wavelength conversion function. The scattering particles scatter incident light and thus allow more incident light to be incident on the wavelength converting particles. The scattering particles can uniformly control the emission angle of light having each wavelength. Specifically, when light is incident on the wavelength converting particles and then wavelength-converted and emitted, the emitted light has a random scattering characteristic. If the scattering particles are not provided in the wavelength conversion layer 30, the green wavelength light and the red wavelength light emitted after colliding with the wavelength conversion particles have a scattered emission characteristic, but the blue wavelength light emitted without colliding with the wavelength conversion particles does not have a scattered emission characteristic. Thus, the emission of blue, green, and red wavelength light may differ depending on the emission angle of the light. Since the scattering particles impart a scattering emission characteristic even to blue-wavelength light emitted without colliding with the wavelength converting particles, the emission angle of light having each wavelength can be uniformly controlled. TiO may be used₂Or SiO₂as scattering particles.

the wavelength converting layer 30 may be thicker than the low refractive index layer 20. The wavelength conversion layer 30 may have a thickness of about 10 μm to 50 μm. In one exemplary embodiment, the wavelength conversion layer 30 may have a thickness of about 15 μm.

The wavelength conversion layer 30 may cover the top surface 20a of the low refractive index layer 20 and may completely overlap with the low refractive index layer 20. The bottom surface 30b of the wavelength conversion layer 30 may be in direct contact with the top surface 20a of the low refractive index layer 20. In one exemplary embodiment, the side of the wavelength conversion layer 30 may be aligned with the side of the low refractive index layer 20. Fig. 2 illustrates an example in which the side of the wavelength conversion layer 30 and the side of the low refractive index layer 20 are vertically aligned with the top surface 10a of the light guide plate 10, but the present disclosure is not limited thereto. In other words, alternatively, the side of the wavelength conversion layer 30 and the side of the low refractive index layer 20 have an inclination angle of less than 90 ° with respect to the top surface 10a of the light guide plate 10. The inclination angle of the side of the wavelength conversion layer 30 may be smaller than that of the low refractive index layer 20. As will be described later, if the wavelength conversion layer 30 is formed by slit coating, the side of the wavelength conversion layer 30, which is relatively thick, may have a more gentle inclination angle than the side of the low refractive index layer 20, but the present disclosure is not limited thereto. In other words, alternatively, the inclination angle of the side of the wavelength conversion layer 30 may be substantially equal to or even smaller than the inclination angle of the side of the low refractive index layer 20.

The wavelength conversion layer 30 may be formed by coating. For example, the wavelength conversion layer 30 may be formed by slit-coating a wavelength conversion composition on the light guide plate 10 on which the low refractive index layer 20 is formed and drying and curing the wavelength conversion composition, but the present disclosure is not limited thereto. In other words, wavelength-converting layer 30 may be formed using various methods other than those set forth herein.

The wavelength conversion layer 30 is disposed between the low refractive index layer 20 and the passivation layer 40. The passivation layer 40 prevents the penetration of moisture and/or oxygen. The passivation layer 40 may include an inorganic material. For example, the passivation layer 40 may include silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride, or a metal film having light transmittance. In one exemplary embodiment, the passivation layer 40 may be formed of silicon nitride.

The passivation layer 40 may completely cover the low refractive index layer 20 and the wavelength conversion layer 30 on at least one side of the low refractive index layer 20 and the wavelength conversion layer 30. In one exemplary embodiment, the passivation layer 40 may completely cover the low refractive index layer 20 and the wavelength conversion layer 30 on all sides of the low refractive index layer 20 and the wavelength conversion layer 30, but the inventive concept is not limited thereto.

The passivation layer 40 completely overlaps the wavelength conversion layer 30, covers the top surface 30a of the wavelength conversion layer 30, and further extends from the top surface 30a of the wavelength conversion layer 30 to cover the side of the wavelength conversion layer 30 and the side of the low refractive index layer 20. The passivation layer 40 may contact the top surface 30a and the side of the wavelength conversion layer 30 and the side of the low refractive index layer 20. For example, the bottom surface 40b of the passivation layer 40 may be in direct contact with the top surface 30a of the wavelength conversion layer 30. The passivation layer 40 may extend to an edge of the top surface 10a of the light guide plate 10 exposed through the low refractive index layer 20, and thus may be in direct contact with the top surface 10a of the light guide plate 10. In one exemplary embodiment, the side of the passivation layer 40 may be aligned with the side 10s of the light guide plate 10.

The thickness of the passivation layer 40 may be less than the thickness of the wavelength conversion layer 30, and may be equal to or less than the thickness of the low refractive index layer 20. The thickness of the passivation layer 40 may be 0.1 μm to 2 μm. If the thickness of the passivation layer 40 is 0.1 μm or more, the passivation layer 40 may perform a moisture/oxygen permeation prevention function at a significant level. If the thickness of the passivation layer 40 is 0.3 μm or more, the passivation layer 40 can perform the moisture/oxygen permeation preventing function even more effectively. The thickness of the passivation layer 40 may preferably be 2 μm or less in terms of achieving thinness and transmittance. In one exemplary embodiment, the thickness of the passivation layer 40 may be about 0.4 μm.

the wavelength converting layer 30, in particular the wavelength converting particles comprised in the wavelength converting layer 30, is very susceptible to moisture and/or oxygen. In a conventional wavelength conversion film, barrier films are laminated on top and bottom surfaces of a wavelength conversion layer to prevent moisture and/or oxygen from penetrating into the wavelength conversion layer. On the other hand, in the optical member 100, the wavelength conversion layer 30 is provided without any barrier film laminated thereon, and therefore, a sealing structure for protecting the wavelength conversion layer 30 is required instead of the barrier film. The sealing structure may be implemented by the passivation layer 40 and the light guide plate 10.

Moisture may penetrate into the wavelength-converting layer 30 through the top surface 30a, the side, and the bottom surface 30b of the wavelength-converting layer 30. As already mentioned above, the top surface 30a and the side portions of the wavelength conversion layer 30 are covered and protected by the passivation layer 40. Accordingly, moisture and/or oxygen infiltration through the top surface 30a and sides of the wavelength conversion layer 30 may be prevented or at least mitigated.

On the other hand, the bottom surface 30b of the wavelength conversion layer 30 is in contact with the top surface 20a of the low refractive index layer 20. In the case where the low refractive index layer 20 includes the voids VD or is formed of an organic material, moisture may move around the inside of the low refractive index layer 20, and thus, moisture and/or oxygen may permeate into the wavelength conversion layer 30 through the bottom surface 30b of the wavelength conversion layer 30. However, since the low refractive index layer 20 has a sealing structure, moisture and/or oxygen can be prevented from permeating through the bottom surface 30b of the wavelength conversion layer 30.

In particular, since the side portions of the low refractive index layer 20 are covered and protected by the passivation layer 40, moisture and/or oxygen may be prevented or at least mitigated from penetrating through the side portions of the low refractive index layer 20. Even if the low refractive index layer 20 protrudes beyond the wavelength conversion layer 30 such that a portion of the top surface 20a of the low refractive index layer 20 is exposed, the exposed portion of the top surface 20a is still covered and protected by the passivation layer 40, and thus, moisture and/or oxygen can be prevented or at least mitigated from penetrating through the top surface 20a of the low refractive index layer 20. The bottom surface 20b of the low refractive index layer 20 is in contact with the light guide plate 10. In the case where the light guide plate 10 is formed of an inorganic material such as glass, the light guide plate 10 may prevent or reduce the penetration of moisture and/or oxygen, like the passivation layer 40. Since the stack of the low refractive index layer 20 and the wavelength conversion layer 30 is surrounded and sealed by the passivation layer 40 and the light guide plate 10, even if there are channels for moisture and/or oxygen in the low refractive index layer 20, the penetration of moisture and/or oxygen can be prevented or at least mitigated by the sealing structure formed by the passivation layer 40 and the light guide plate 10. Thus, degradation of the wavelength converting particles by moisture and/or oxygen may be prevented or at least reduced.

the passivation layer 40 may be formed by deposition. For example, the passivation layer 40 may be formed on the light guide plate 10 on which the low refractive index layer 20 and the wavelength conversion layer 30 are sequentially formed by CVD, but the inventive concept is not limited thereto. In other words, the passivation layer 40 may be formed using various deposition methods other than CVD.

As already mentioned above, since the optical member 100 is an integral single member capable of simultaneously performing both the optical guiding function and the wavelength converting function, the manufacturing of the display device can be simplified. In addition, since the low refractive index layer 20 is disposed on the top surface 10a of the light guide plate 10 in the optical member 100, total reflection can effectively occur at the top surface 10a of the light guide plate 10. In addition, since the low refractive index layer 20 and the wavelength conversion layer 30 are sealed by the passivation layer 40, the deterioration of the wavelength conversion layer 30 can be prevented.

The first optical pattern layer 50 may be disposed under the light guide plate 10. The top surface 50a of the first optical pattern layer 50 may be in contact with the bottom surface 10b of the light guide plate 10, but the present disclosure is not limited thereto. In other words, alternatively, an additional layer may be formed between the first optical pattern layer 50 and the light guide plate 10, or the first optical pattern layer 50 and the light guide plate 10 may be spaced apart from each other to have a space therebetween.

In one exemplary embodiment, the side of the first optical pattern layer 50 may be aligned with the side 10s of the light guide plate 10. In other words, the first optical pattern layer 50 may completely cover the bottom surface 10b of the light guide plate 10. In another exemplary embodiment, the first optical pattern layer 50 may cover most of the bottom surface 10b of the light guide plate 10, but may partially expose the edge of the light guide plate 10. In other words, the side portion 10s of the light guide plate 10 may protrude beyond the side portion of the first optical pattern layer 50.

The first optical pattern layer 50 changes the path of light propagating inside the light guide plate 10 by total reflection, and thus allows the light to be emitted. Specifically, among the light beams incident on the light incident surface 10s1, the light traveling toward the first optical pattern layer 50 is refracted or reflected at the interface between the first optical pattern layer 50 and the air layer to travel toward the opposite surface 10s 3.

In one exemplary embodiment, the first optical pattern layer 50 may be provided as a layer separate from the light guide plate 10. The first optical pattern layer 50 may be a scattering pattern layer providing a scattering pattern including a convex pattern and/or a concave pattern on the bottom surface 10b of the light guide plate 10. In another exemplary embodiment, the first optical pattern layer 50 may not be provided as a separate layer, but may be formed on the light guide plate 10 as a surface pattern.

The scattering pattern of the first optical pattern layer 50 may be formed as a linear pattern extending parallel to the light incident surface 10s1 and the opposite surface 10s 3. The scattering pattern of the first optical pattern layer 50 may have various sectional shapes such as a semicircular sectional shape, a triangular sectional shape, or a rectangular sectional shape. The cross-sectional shape of the scattering pattern of the first optical pattern layer 50 may be uniform, but the inventive concept is not limited thereto. The scattering pattern of the first optical pattern layer 50 may be formed in a column shape and may have a semicircular sectional shape, and the size of the scattering pattern of the first optical pattern layer 50 may be uniform from the light incident surface 10s1 to the opposite surface 10s 3. However, the sectional shape of the scattering pattern of the first optical pattern layer 50 is not particularly limited, and the size of the scattering pattern of the first optical pattern layer 50 may gradually increase from the light incident surface 10s1 to the opposite surface 10s 3.

The scattering pattern of the first optical pattern layer 50 may be formed on the base film using an imprinting method or a mold, but the inventive concept is not limited thereto. In other words, the scattering pattern of the first optical pattern layer 50 may be formed using various methods other than the methods set forth herein.

Although not specifically illustrated, the first optical pattern layer 50 may further include an adhesive member (not shown). The adhesive member may be disposed between the top surface 50a of the first optical pattern layer 50 and the bottom surface 10b of the light guide plate 10, and may attach and fix the first optical pattern layer 50 on the bottom surface 10b of the light guide plate 10. The adhesive member may include a Pressure Sensitive Adhesive (PSA), and may further include a primer for improving adhesion, but the inventive concept is not limited thereto.

The second optical pattern layer 60 is disposed on the light incident surface 10s1 of the light guide plate 10. The second optical pattern layer 60 is disposed between the light source 400 and the light guide plate 10, and controls an incident angle of light on the light guide plate 10. The second optical pattern layer 60 may include a Fresnel (Fresnel) lens structure. The structure and function of the second optical pattern layer 60 will be described hereinafter with reference to fig. 5 to 7.

fig. 5 is an enlarged perspective view of an optical member according to another exemplary embodiment of the present invention. FIG. 6 is a cross-sectional view of an exemplary second optically patterned layer taken along line VI-VI' of FIG. 5. Fig. 7 is a cross-sectional view illustrating a path of light passing through the second optical pattern layer of fig. 6.

Referring to fig. 1, 2, 5 and 6, the second optical pattern layer 60 may include a base layer 61, a pattern layer 62 and an adhesive layer 63. The base layer 61 may be a support member supporting each of the second optical pattern layers 60. The size of the base layer 61 may be substantially the same as that of the pattern layer 62, but the inventive concept is not limited thereto. In other words, the base layer 61 may alternatively be larger than the pattern layer 62. In this case, the edge of the base layer 61 may be exposed. This will be described later with reference to fig. 21.

the base layer 61 may be a thin film whose top and bottom surfaces are parallel to each other. The substrate layer 61 may include an inorganic material, and thus may perform a moisture/oxygen permeation prevention function. The base layer 61 may be formed as an acrylic film, a polyether film, a polyester film, a polyolefin film, a polyamide film, a polyurethane film, a polycarbonate film, or a polyimide film, but the inventive concept is not limited thereto.

The pattern layer 62 may be disposed on the base layer 61. The pattern layer 62 may be formed to cover the entire base layer 61, but the inventive concept is not limited thereto. In other words, as already mentioned above, the pattern layer 62 may be formed to expose the edge of the base layer 61.

Patterned layer 62 may include a focusing lens structure. For example, patterned layer 62 may have surface irregularities. The surface irregularities of the design layer 62 may form a linear fresnel lens structure, wherein the linear fresnel lens is a type of focusing lens. In other words, the pattern layer 62 may have a shape in which thin prism stripes having the same curvature as the convex lenses are arranged at a constant pitch. Like the convex lens, the pattern layer 62 including the fresnel lens structure can focus light while maintaining a small thickness. In some exemplary embodiments, the surface irregularities of patterned layer 62 may be divided into several bands that each act as a prism. Therefore, the pattern layer 62 may have a small thickness and a small distortion.

specifically, the pattern layer 62 may include a plurality of uneven patterns PAS and convex surfaces CV. The uneven pattern PAS and the convex surface CV of the pattern layer 62 may be formed on a surface opposite to the surface of the pattern layer 62 adhered to the base layer 61. In other words, the surface on which the uneven pattern PAS and the convex surface CV are formed may be a surface exposed to the outside.

The convex surface CV may be disposed to overlap the center CVL of the pattern layer 62. Since the convex surface CV is a surface having a predetermined curvature, the pattern layer 62 may be thicker at the center CVL than at both sides of the convex surface CV. The uneven pattern PAS may be disposed on the outer portion of the convex surface CV. A plurality of the uneven patterns PAS may be arranged in series between the edge of the convex surface CV and both ends of the pattern layer 62. The uneven pattern PAS may include a flat surface parallel to the top surface 10a and the bottom surface 10b of the light guide plate 10 and a curved surface having a predetermined curvature. The convex surface CV and the uneven pattern PAS of the pattern layer 62 may include surfaces extending parallel to the top surface 10a and the bottom surface 10b of the light guide plate 10.

The pattern layer 62 may be formed of acrylate, urethane acrylate, silicone, epoxy, or a combination thereof, and may include a UV initiator and a binder, but the inventive concept is not limited thereto.

The path of light passing through the second optical pattern layer 60 including the fresnel lens will be described hereinafter with reference to fig. 7.

Fig. 7 illustrates that light emitted from the light source L passes through the second optical pattern layer 60. Referring to fig. 7, the light source L employs a lambertian illuminant, such as the LED 410 of fig. 1. The light emitted from the light source L may be incident on the second optical pattern layer 60 and may be refracted according to a difference in refractive index at an interface formed through the second optical pattern layer 60.

the second optical pattern layer 60 may include a plurality of the uneven patterns PAS. The light emitted from the light source L may pass through the second optical pattern layer 60 and may enter the light guide plate 10. A part of the light emitted from the light source L may PASs through the uneven pattern PAS on one end portion of the second optical pattern layer 60.

A path of light passing through the second optical pattern layer 60 will be described hereinafter, wherein the incident light L1 is light incident on one end portion of the second optical pattern layer 60, and the refracted light L2 is incident light L1 refracted through the second optical pattern layer 60.

In order for the light to be effectively totally reflected within the light guide plate 10, the light needs to be incident on the interface between the light guide plate 10 and the second optical pattern layer 60 at an incident angle greater than a predetermined critical angle. The critical angle may be determined by a difference in refractive index between the light guide plate 10 and a layer forming an interface with the light guide plate 10, and the larger the difference in refractive index between the light guide plate 10 and the layer forming an interface with the light guide plate 10, the smaller the critical angle becomes and more effective total reflection will occur. As already mentioned above, if the wavelength conversion layer 30 (of fig. 2) is directly disposed on the light guide plate 10, total reflection may not properly occur since a difference between the refractive index of the light guide plate 10 and the refractive index of the wavelength conversion layer 30 is small. Accordingly, the low refractive index layer 20 may be disposed between the light guide plate 10 and the wavelength conversion layer 30, thereby lowering the critical angle to effectively cause total reflection. The critical angle may be determined by a difference between the refractive index of the light guide plate 10 and the refractive index of the low refractive index layer 20. For example, when the refractive index of the light guide plate 10 is 1.515 and the refractive index of the low refractive index layer 20 is 1.24, the critical angle may be about 55.5 °.

The incident light L1 propagates without passing through the second optical pattern layer 60 to follow the path of the non-refracted light L2'. If the non-refracted light L2 'is incident on the light guide plate 10 at an incident angle less than the critical angle, a portion of the non-refracted light L2' may pass through the light guide plate 10 without undergoing total reflection at the interface between the top surface 10a of the light guide plate 10 and the bottom surface 20b of the low refractive index layer 20. In other words, a part of the non-refracted light L2' may not be guided by the light guide plate 10, and thus may cause light leakage, particularly at the light incident surface 10s 1. These light leaks may reduce the brightness of the display device. For example, the loss of luminance caused by such light leakage may amount to 10% to 15% of the original luminance of the display device, depending on the refractive index of the low refractive index layer 20.

In the case where the second optical pattern layer 60 is disposed on the light incident surface 10s1 of the light guide plate 10, the incident light L1 may be refracted by the second optical pattern layer 60, and the refracted light L2 may be incident on the top surface 10a of the light guide plate 10 and the bottom surface 20b of the low refractive index layer 20. The incident angle of the refracted light L2 may be greater than the incident angle of the non-refracted light L2'. In other words, the second optical pattern layer 60 may convert the angular component of the incident light L1 into the angular component of the refracted light L2 that is greater than the critical angle, and as a result, total reflection may effectively occur. Light passing through both end portions of the second optical pattern layer 60 may be refracted more than light passing through the center CVL of the second optical pattern layer 60. The light causing the light leakage may be light incident on both end portions of the second optical pattern layer 60. Therefore, the incident light L1 incident on the end portion of the second optical pattern layer 60 can be effectively subjected to total reflection.

referring again to fig. 5 and 6, an adhesive layer 63 may be disposed below the base layer 61. In the case where the adhesive layer 63 is attached on the light incident surface 10s1 of the light guide plate 10, light loss, which may be caused by fresnel reflection at the interface between the second optical pattern layer 60 and the light guide plate 10, may be prevented.

The adhesive layer 63 is disposed between the base layer 61 and the light incident surface 10s1 of the light guide plate 10, and attaches and fixes the second optical pattern layer 60 on the light incident surface 10s1 of the light guide plate 10 via the attachment surface 60 s. The adhesive layer 63 may include a PSA and may further include a primer for improving adhesion, similar to the adhesive member of the first optical pattern layer 50, but the inventive concept is not limited thereto.

A release film (not shown) may be further provided on the adhesive layer 63 before the second optical pattern layer 60 is attached to the light guide plate 10. The release film may protect the adhesive layer 63 and may be peeled off before the second optical pattern layer 60 is attached to the light incident surface 10s1 of the light guide plate 10. The release film may be formed of, for example, polyethylene terephthalate (PET), but the inventive concept is not limited thereto.

The second optical pattern layer 60 may be manufactured in a roll in order to be easily attached to the light guide plate 10. By attaching the second optical pattern layer 60 in a wound state to the light incident surface 10s1 of the light guide plate 10 and cutting the second optical pattern layer 60, a continuous bonding process may be performed.

Fig. 8 is a cross-sectional view of another exemplary second optical pattern layer. The second optical pattern layer 60_1 of fig. 8 is different from the second optical pattern layer 60 of fig. 6 in that the uneven patterns PA1 and PA2 are formed only at both end portions of the pattern layer 62_ 1. The second optical pattern layer 60_1 will hereinafter be described mainly focusing on the difference from the second optical pattern layer 60 of fig. 6.

Referring to FIG. 8, the pattern layer 62_1 of the second optical pattern layer 60_1 may include uneven patterns PA1 and PA2 and a flat surface FA. The uneven patterns PA1 and PA2 may be provided at both end portions of the pattern layer 62_ 1. For convenience, only two uneven patterns PA1 and PA2 are illustrated as being disposed at both ends of the pattern layer 62_1 with the flat surface FA disposed between both ends of the pattern layer 62_1, but the inventive concept is not limited thereto. In other words, each of the uneven patterns PA1 and PA2 may include a plurality of optical patterns.

as already mentioned above, light incident on both end portions of the second optical pattern layer 60_1 may cause light leakage. Accordingly, the uneven patterns PA1 and PA2 are formed only on both end portions of the second optical pattern layer 60_1 to control light incident on both end portions of the second optical pattern layer 60_ 1. The light passing through the flat surface FA may travel along the same path as the light passing through the optical member not including the second optical pattern layer 60_ 1. The flat surface FA may have a larger area than the uneven patterns PA1 and PA 2.

Fig. 9 is a cross-sectional view of another exemplary second optical pattern layer. The second optical pattern layer 60_2 of fig. 9 is different from the second optical pattern layer 60 of fig. 6 in that a passivation layer 64 is further provided on the pattern layer 62 to protect the pattern layer 62.

Referring to fig. 9, a passivation layer 64 may be disposed on the pattern layer 62. The passivation layer 64 may protect the pattern layer 62 so that the pattern layer 62 may maintain its shape. A top surface of passivation layer 64 may be substantially parallel to a top surface of base layer 61, although the disclosure is not limited thereto. In other words, the passivation layer 64 may alternatively be formed to conform to the surface shape of the pattern layer 62.

In another exemplary embodiment, an additional adhesive member (not shown) may be further disposed on the passivation layer 64. The light source 400 of fig. 1 may be attached to an adhesive member. The light source 400 may be disposed in the case (500 of fig. 22), and the second optical pattern layer 60_2 may be in contact with the light source 400 via an adhesive member. In the case where the second optical pattern layer 60_2 and the light source 400 contact each other, light loss, which may be caused by fresnel reflection between the second optical pattern layer 60_2 and the light source 400, may be prevented.

fig. 10 and 11 are perspective views of other exemplary second optical pattern layers. The second optical pattern layer 60_3 of fig. 10 and the second optical pattern layer 60_4 of fig. 11 are different from the second optical pattern layer 60 of fig. 6 in that they include circular fresnel lenses, not linear fresnel lenses.

referring to fig. 10, the second optical pattern layer 60_3 may include circular fresnel lenses C1 and C2 arranged in a row. Circular fresnel lenses C1 and C2 may be disposed to face the light source 400 of fig. 1 or the LED 410 of fig. 1. Accordingly, not only the incident angles of light leaked from the top and bottom of the light guide plate 10 of fig. 2 but also the incident angles of light leaked from the left and right sides of the light guide plate 10 of fig. 2 can be controlled. Therefore, the luminance uniformity of the light guide plate 10 may be improved.

Referring to fig. 11, the second optical pattern layer 60_4 may include a circular fresnel lens array CA having a plurality of circular fresnel lenses CA1, CA2, CA3, CA4, CA5, and CA6 arranged in a plurality of rows. For convenience, the circular fresnel lens array CA is shown to include two rows of circular fresnel lenses, but may include more circular fresnel lenses than two rows. Like the circular fresnel lenses C1 and C2 of fig. 10, circular fresnel lenses CA1, CA2, CA3, CA4, CA5, and CA6 may be disposed to face the light source 400 of fig. 1 or the LED 410 of fig. 1.

Like the second optical pattern layer 60 of fig. 6, the width of the second optical pattern layer 60_1, 60_2, 60_3, or 60_4 may be substantially the same as the thickness of the light guide plate 10, but the inventive concept is not limited thereto. In other words, alternatively, the width of the second optical pattern layer 60_1, 60_2, 60_3, or 60_4 may be greater than the thickness of the light guide plate 10, so that the second optical pattern layer 60_1, 60_2, 60_3, or 60_4 may cover not only the light incident surface 10s1 of the light guide plate 10 but also the side of the low refractive index layer 20 and the side of the wavelength conversion layer 30.

fig. 12 and 13 are perspective views of the parent stack structure before and after being cut into nine equal pieces.

Referring to fig. 12 and 13, the mother stack structure 11m may be formed by sequentially stacking a low refractive index layer 20, a wavelength conversion layer 30, and a passivation layer 40 on a mother light guide plate 10 m. The mother stack structure 11m may be obtained by forming the low refractive index layer 20 and the wavelength conversion layer 30 on the mother light guide plate 10m to expose an edge of the top surface of the mother light guide plate 10m and then forming the passivation layer 40 to cover the side portion 20s of the low refractive index layer 20 and the side portion 30s of the wavelength conversion layer 30. When applied as the optical member 100, the mother stack structure 11m may have the same structure as the stack structure 11 of fig. 2.

In some exemplary embodiments, a single stacked structure may be obtained by forming and then cutting the mother stacked structure 11 m. In other words, as shown in fig. 13, the individual stacked structures 11a, 11b, and 11c can be obtained by preparing and cutting the mother stacked structure 11 m. Fig. 13 shows an example in which the mother stacked structure 11m is cut into nine equal pieces along the cutting line CL. The cut surface of the mother stack structure 11m may have a different shape from the non-cut surface of the mother stack structure 11 m. The individual stacked structures 11a, 11b, and 11c may have different side shapes according to the number and positions of the sides of the stacked structures 11a, 11b, and 11c forming the cutting surfaces. The side portion 20s of the low refractive index layer 20 and the side portion 30s of the wavelength conversion layer 30 may be exposed on the cut surface.

Fig. 14 to 16 are perspective views of a single stack structure obtained from the mother stack structure of fig. 12 and 13. Specifically, fig. 14 to 16 show three types of single stacked structures among nine single stacked structures obtained by cutting the mother stacked structure 11m of fig. 13. Referring to fig. 14, the single stacked structure 11a has four cut sides 11as1, 11as2, 11as3, and 11as 4. In other words, all sides of the single stack structure 11a overlap the cut surface of the mother stack structure 11m of fig. 13, and thus the side 20s of the low refractive index layer 20 and the side 30s of the wavelength conversion layer 30 may all be exposed on the side of the single stack structure 11a, rather than being covered by the passivation layer 40. The cut sides 11as1, 11as2, 11as3, and 11as4 may include the side 20s of the low refractive index layer 20 and the side 30s of the wavelength conversion layer 30, and may be exposed.

Referring to fig. 15, the single stacked structure 11b has three cut sides 11bs2, 11bs3, and 11bs4 and one non-cut side 11bs 1. Referring to fig. 16, a single stacked structure 11c has two cut sides 11cs2 and 11cs3 and two non-cut sides 11cs1 and 11cs 4. Although not specifically illustrated, each individual stacked structure obtained by cutting the mother stacked structure 11m into two equal pieces may have one cut side and three non-cut sides.

Since the side 20s of the low refractive index layer 20 and the side 30s of the wavelength conversion layer 30 are exposed on the cut sides 11as1, 11as2, 11as3, and 11as4 of the single stacked structure 11a, on the cut sides 11bs2, 11bs3, and 11bs4 of the single stacked structure 11b, and on the cut sides 11cs2 and 11cs3 of the single stacked structure 11c, instead of being covered by the passivation layer 40, moisture and/or oxygen may permeate into the wavelength conversion layer 30 through the cut sides 11as1, 11as2, 11as3, and 11as4 of the single stacked structure 11a, the cut sides 11bs2, 11bs3, and 11bs4 of the single stacked structure 11b, and the cut sides 11cs2 and 11cs3 of the single stacked structure 11c, and as a result, the wavelength conversion layer 30 may deteriorate. Accordingly, by providing a sealing structure for blocking moisture and/or oxygen on the cut sides 11as1, 11as2, 11as3, and 11as4 of the single stacked structure 11a, the cut sides 11bs2, 11bs3, and 11bs4 of the single stacked structure 11b, and the cut sides 11cs2 and 11cs3 of the single stacked structure 11c, the penetration of moisture and/or oxygen can be prevented. A barrier film or sealing tape may be used as the sealing structure. The sealing structure may be attached to the portion of each of the individual stacked structures 11a, 11b, and 11c that needs to be sealed, for example, the cut sides 11as1, 11as2, 11as3, and 11as4 of the individual stacked structure 11 a; cut sides 11bs2, 11bs3, and 11bs4 of single stacked structure 11 b; and cut sides 11cs2 and 11cs3 of single stacked structure 11 c. Almost any structure that can appropriately prevent the penetration of moisture and/or oxygen by covering the side portion 20s of the low refractive index layer 20 and the side portion 30s of the wavelength conversion layer 30 can be used as the sealing structure.

An optical member according to other exemplary embodiments of the present invention will be described below. In fig. 1, 2, and 17 to 21, like reference numerals denote like elements, and thus, a detailed description thereof will be omitted.

Fig. 17 and 18 are sectional views of optical members according to other exemplary embodiments of the present invention. The optical member 100_5 of fig. 17 or the optical member 100_6 of fig. 18 is different from the optical member 100 of fig. 1 and 2 in that: it has a cut surface, and the cut surface is covered and protected by the second optical pattern layer 60_5 or 60_ 6. In other words, the side portion 20s of the low refractive index layer 20 and the side portion 30s of the wavelength conversion layer 30 may be exposed on the cut surface of the optical member 100_5 or 100_ 6. The optical members 100_5 and 100_6 will be described hereinafter mainly focusing on differences from the optical member 100 of fig. 1 and 2.

Specifically, fig. 17 and 18 show that the side portion 20s of the low refractive index layer 20 and the side portion 30s of the wavelength conversion layer 30 are covered by the second optical pattern layer 60_5 or 60_ 6.

Referring to fig. 17, the second optical pattern layer 60_5 may be disposed to cover the side portion 20s of the low refractive index layer 20 and the side portion 30s of the wavelength conversion layer 30. As already mentioned above, in the case where the optical member 100_5 has a cut surface, moisture and/or oxygen may permeate into the wavelength conversion layer 30 through the side portion 20s of the low refractive index layer 20 and the side portion 30s of the wavelength conversion layer 30, and as a result, the wavelength conversion particles included in the wavelength conversion layer 30 may deteriorate. The attachment surface 60_5s of the second optical pattern layer 60_5 may be in contact with the side portion 20s of the low refractive index layer 20 and the side portion 30s of the wavelength conversion layer 30, and thus, the penetration of moisture and/or oxygen may be prevented. Accordingly, the life of the wavelength conversion particles of the wavelength conversion layer 30 can be improved, and the color reproducibility of the display device can be maintained over a long period of time.

The optical member 100_6 is different from the optical member 100_5 of fig. 17 in that: the second optical pattern layer 60_6 covers even the side portion 50s of the first optical pattern layer 50. In the case where the second optical pattern layer 60_6 covers the side portion 50s of the first optical pattern layer 50, the area of the attachment surface 60_6s of the second optical pattern layer 60_6 may be increased. In other words, the adhesiveness of the second optical pattern layer 60_6 may be improved. Accordingly, the second optical pattern layer 60_6 may further effectively prevent moisture and/or oxygen from penetrating into the wavelength conversion layer 30. In addition, the second optical pattern layer 60_6 may be prevented from being peeled off at the attachment surface 60_6s thereof.

Fig. 19 and 20 are sectional views of optical members according to other exemplary embodiments of the present invention. The optical member 100_7 of fig. 19 and the optical member 100_8 of fig. 20 are different from the optical member 100_5 of fig. 17 in that: they also include tape layer 70 or 70_ 8. The optical member 100_7 of fig. 19 and the optical member 100_8 of fig. 20 will be described hereinafter mainly focusing on the difference from the optical member 100_5 of fig. 17.

referring to fig. 19, the optical member 100_7 may include an adhesive tape layer 70. The adhesive tape layer 70 may be disposed on at least one of the sides 10s of the light guide plate 10. Specifically, the adhesive tape layer 70 may be disposed on the opposite surface (10 s3 of fig. 2) of the light guide plate 10. In one exemplary embodiment, the tape layer 70 may be a sealing tape for protecting the wavelength conversion layer 30. In other words, the adhesive tape layer 70 may be disposed to cover the side 20s of the low refractive index layer 20 and the side 30s of the wavelength conversion layer 30, and thus prevent moisture and/or oxygen from penetrating into the low refractive index layer 20 and the wavelength conversion layer 30. The adhesive tape layer 70 may be disposed to cover the side 10s of the light guide plate 10, the side 20s of the low refractive index layer 20, the side 30s of the wavelength conversion layer 30, and the side 40s of the passivation layer 40, but the present disclosure is not limited thereto. In other words, alternatively, the adhesive tape layer 70 may not cover the side portion 40s of the passivation layer 40 or may further cover the side portion 50s of the first optical pattern layer 50.

In another exemplary embodiment, the adhesive tape layer 70 may be a reflective adhesive tape that prevents light leakage at the opposite side (10 s3 of fig. 2) of the light guide plate 10. The tape layer 70 may include a light reflective material and may reflect light incident thereon. For example, the light reflective material may include silver (Ag). The light reflective material may be deposited or coated directly on the attachment surface 70s of the tape layer 70. The reflective tape on which Ag is deposited may reflect light having a full wavelength band. In another example, tape layer 70 may have a stack of multiple layers with different refractive indices, such as a reflective polarizing film, instead of a light reflective material.

in yet another exemplary embodiment, the tape layer 70 may be a reflective tape including a yellow material. In the case where a yellow material is contained on the attachment surface 70s of the tape layer 70, the tape layer 70 may absorb blue light incident thereon, and thus may further effectively prevent light leakage at the opposite surface (10 s3 of fig. 2) of the light guide plate 10.

Fig. 20 is a plan view of an optical member according to another exemplary embodiment of the present invention. In the case where the optical member 100_8 has four cut surfaces, as described with reference to fig. 14, it is necessary to prevent moisture and/or oxygen from penetrating on all sides of the optical member 100_ 8. Fig. 20 illustrates an optical member 100_8 in which an adhesive tape layer 70_8 is disposed on all side portions 10s of the light guide plate 10 except the light incident surface 10s1 in the optical member 100_ 8. Referring to fig. 20, the tape layer 70_8 may include an attachment surface 70_8s3 covering the opposite face 10s3 of the light guide plate 10, and may further include an attachment surface 70_8s2 covering the second side 10s2 of the light guide plate 10 and an attachment surface 70_8s4 covering the fourth side 10s4 of the light guide plate 10.

Although not specifically illustrated, in the case where the second optical pattern layer 60 is attached to the light guide plate 10 before the adhesive tape layer 70_8 is attached to the light guide plate 10, the adhesive tape layer 70_8 may be formed to further extend to cover the second optical pattern layer 60. On the other hand, in the case where the adhesive tape layer 70_8 is attached to the light guide plate 10 before the second optical pattern layer 60 is attached to the light guide plate 10, the second optical pattern layer 60 may be formed to further extend to cover the adhesive tape layer 70_ 8. In other words, the second optical pattern layer 60 and the adhesive tape layer 70_8 may be connected to each other, and may surround the entire side 10s of the light guide plate 10.

In the case where the tape layer 70_8 is disposed to cover not only the opposite face 10s3 but also the other sides 10s2 and 10s4 of the light guide plate 10, the tape layer 70_8 may further effectively prevent moisture and/or oxygen from penetrating into the optical member 100_8, and may prevent light leakage at the entire sides 10s of the light guide plate 10.

Fig. 21 is a sectional view of an optical member according to another exemplary embodiment of the present invention. The optical member 100_9 of fig. 21 is different from the optical member 100_7 of fig. 19 in that: the second optical pattern layer 60_9 and the adhesive tape layer 70_9 include folded surfaces 60_9a and 70_9a respectively partially covering the top surface 40a of the passivation layer 40 (partially covering the top face 30a of the wavelength conversion layer 30 in case that the passivation layer 40 is not disposed), and further include folded surfaces 60_9b and 70_9b respectively partially covering the bottom surface (50 b in fig. 2) of the first optical pattern layer 50.

Referring to fig. 21, the second optical pattern layer 60_9 may include a first folding surface 60_9a and a second folding surface 60_9b, and the tape layer 70_9 may include a first folding surface 70_9a and a second folding surface 70_9 b.

The first and second folded surfaces 60_9a and 60_9b may include an adhesive layer (63 of fig. 6), and thus the attachment area of the second optical pattern layer 60_9 may be increased. In other words, the adhesiveness of the second optical pattern layer 60_9 may be improved. The pattern layer (62 of fig. 6) may not be formed on the first and second folding surfaces 60_9a and 60_9 b. Alternatively, the pattern layer may be formed on the first and second folded surfaces 60_9a and 60_9b, but may be a flat surface on which the uneven pattern (PAS of fig. 6) is not formed. The second optical pattern layer 60_9 may be securely attached via the attachment surface 60_9s, the first folding surface 60_9a, and the second folding surface 60_9b, thereby effectively preventing light leakage at the light guide plate 10 and improving moisture/oxygen permeation prevention function.

Similarly, the tape layer 70_9 may be securely attached via the attaching surface 70_9s, the first folding surface 70_9a, and the second folding surface 70_9b, thereby improving the adhesiveness of the tape layer 70_ 9. In addition, a light reflective material may be included even on the first and second folded surfaces 70_9a and 70_9 b. Therefore, light leakage in the display device can be further effectively prevented.

Fig. 22 is a sectional view of a display apparatus according to an exemplary embodiment of the present invention. The display apparatus 1000 of fig. 22 may include the optical member 100 of fig. 1 and 2, but the present disclosure is not limited thereto. In other words, other optical members according to the above-described exemplary embodiments of the present invention may also be applicable to the display apparatus 1000.

referring to fig. 22, the display apparatus 1000 includes a light source 400, an optical member 100 disposed on a path of light emitted from the light source 400, and a display panel 300 disposed over the optical member 100.

The light source 400 is disposed on one side of the optical member 100. The light source 400 may be disposed adjacent to the light incident surface 10s1 of the light guide plate 10 to the optical member 100. The light source 400 may include a plurality of point light source elements or a plurality of line light source elements. As already mentioned above, the point light source elements may be LEDs 410. The LEDs 410 may be mounted on a Printed Circuit Board (PCB) 420. The LED 410 may emit blue light.

In one exemplary embodiment, as shown in fig. 22, the LED 410 may be a side-emitting LED that emits light at its side. In this exemplary embodiment, the PCB 420 may be disposed on the bottom portion 510 of the case 500. Although not specifically illustrated, in another exemplary embodiment, the LED 410 may be a top-emitting LED, in which case the PCB 420 may be disposed on the sidewall 520 of the case 500.

Blue light emitted from the LED 410 may be incident on the light guide plate 10 of the optical member 100. The light guide plate 10 of the optical member 100 guides light and emits the guided light through the top surface 10a or the bottom surface 10b of the light guide plate 10. The wavelength conversion layer 30 of the optical member 100 converts the blue wavelength light incident on the light guide plate 10 into light having another wavelength band, for example, green wavelength light and red wavelength light. The green wavelength light and the red wavelength light are emitted upward along with the non-converted blue wavelength light and thus provided to the display panel 300.

The first optical pattern layer 50 may be disposed on the bottom surface 10b of the light guide plate 10. The first optical pattern layer 50 controls the path of light and thus allows the light guide plate 10 to uniformly supply light to the display panel 300.

The display apparatus 1000 may further include a reflective member 80 disposed under the optical member 100. The reflective member 80 may include a reflective film or a reflective coating layer. The reflection member 80 reflects light emitted from the bottom surface 10b of the light guide plate 10 of the optical member 100, and thus allows the light to enter the light guide plate 10 again.

the display panel 300 is disposed over the optical member 100. The display panel 300 receives light from the optical member 100 and displays a screen using the received light. Examples of the light receiving display panel that receives light and displays a screen using the received light include a Liquid Crystal Display (LCD) panel, an electrophoretic display (EPD) panel, and the like. The display panel 300 will be described below as an LCD panel, but other various light receiving display panels may be applicable to the display apparatus 1000.

the display panel 300 may include a first substrate 310, a second substrate 320 facing the first substrate 310, and a liquid crystal layer (not shown) disposed between the first substrate 310 and the second substrate 320. The first substrate 310 and the second substrate 320 may overlap each other. In one exemplary embodiment, one of the first and second substrates 310 and 320 may be larger in size than the other substrate, and thus may protrude beyond the other substrate. The second substrate 320 is shown larger than the first substrate 310 and protrudes beyond the first substrate 310 on the side where the light source 400 is located. The protruding portion of the second substrate 320 may provide a space in which the driving chip or the external PCB is mounted. Alternatively, the first substrate 310 may be larger than the second substrate 320, and thus may protrude beyond the second substrate 320. A portion of the display panel 300 other than the protruding portion of the second substrate 320 may be substantially aligned with the side portion 10s of the light guide plate 10 of the optical member 100.

The optical member 100 may be coupled to the display panel 300 via the inter-module coupling member 610. The inter-module coupling member 610 may be formed as a rectangular frame in a plan view. The inter-module coupling member 610 may be disposed along an edge of each of the display panel 300 and the optical member 100.

In one exemplary embodiment, a bottom surface of the inter-module coupling member 610 may be disposed on a top surface 40a of the passivation layer 40 of the optical member 100. The bottom surface of the inter-module coupling member 610 may overlap the top surface 30a of the wavelength conversion layer 30 over the passivation layer 40, but not overlap the side portion 30s of the wavelength conversion layer 30 over the passivation layer 40.

The inter-module coupling member 610 may include a polymer resin or an adhesive tape.

In some exemplary embodiments, the inter-module coupling member 610 may additionally serve as a pattern for blocking light transmission. For example, the inter-module coupling member 610 may include a light absorbing material such as a black pigment or a black dye, and thus may block transmission of light.

The display device 1000 may further include a housing 500. The housing 500 may have one open surface and may include a bottom portion 510 and a sidewall 520 connected to the bottom portion 510. In a space defined by the bottom portion 510 and the sidewall 520, the assembly of the light source 400, the optical member 100, and the display panel 300, and the reflective member 80 may be received. The light source 400, the reflective member 80, and the assembly of the optical member 100 and the display panel 300 may be disposed on the bottom portion 510 of the case 500. The height of the sidewall 520 of the case 500 may be substantially the same as the height of the assembly of the display panel 300 and the optical member 100. The display panel 300 may be disposed adjacent to an upper end of the sidewall 520 of the case 500, and may be coupled to the sidewall 520 via the case coupling member 620. The housing coupling member 620 may be formed as a rectangular frame in a plan view. The housing coupling member 620 may include a polymer resin or an adhesive tape.

The display device 1000 may further include at least one optical film 200. The optical film 200 may be disposed between the optical member 100 and the display panel 300, and may be received in a space surrounded by the inter-module coupling member 610. The side of the optical film 200 may be in contact with and attached to the inner side of the inter-module coupling member 610. The optical film 200 and the optical member 100 are illustrated with a gap therebetween, and the optical film 200 and the display panel 300 are also illustrated with a gap therebetween. However, a gap between the optical film 200 and the optical member 100 and a gap between the optical film 200 and the display panel 300 are not required.

The optical film 200 may be a prism film, a diffusion film, a microlens film, a lens film, a polarizing film, a reflective polarizing film, or a phase difference film. The display apparatus 1000 may include a plurality of optical films 200 that may be of the same type or different types. In this case, the plurality of optical films 200 may be disposed to overlap each other, and a side portion of each of the plurality of optical films 200 may be in contact with and attached to an inner side of the inter-module coupling member 610. The plurality of optical films 200 may be spaced apart from each other, and an air layer may be interposed between the plurality of optical films 200.

according to the above and other exemplary embodiments of the present invention, the use of the fresnel lens attached to the light incident surface may improve light leakage at the light incident portion, and as a result, the luminance of the display device may be improved. In addition, since the fresnel lens covers the wavelength conversion layer, deterioration of the wavelength conversion particles included in the wavelength conversion layer can be prevented.

Although certain exemplary embodiments have been described herein, other embodiments and modifications will become apparent from this specification. The inventive concept is therefore not limited to the embodiments, but lies in the broader scope of the appended claims and various modifications and equivalent arrangements as will be apparent to those skilled in the art.