阅读说明：本技术 前光模块及显示装置 (Front light module and display device ) 是由 郑兆峻 戴晟杰 于 2019-10-21 设计创作，主要内容包括：本发明公开了一种前光模块及显示装置,前光模块包括导光板、光源及导光介质。导光板包括顶面、底面及入光面。底面与顶面相对配置。入光面邻接顶面及底面。光源配置于入光面旁,光源的顶面与导光板的顶面之间具有第一段差。导光介质位于光源与导光板的入光面之间。通过这样的设计,可提供全平面的面光源。(The invention discloses a front light module and a display device. The light guide plate comprises a top surface, a bottom surface and a light incident surface. The bottom surface is arranged opposite to the top surface. The light incident surface is adjacent to the top surface and the bottom surface. The light source is arranged beside the light incident surface, and a first section difference is formed between the top surface of the light source and the top surface of the light guide plate. The light guide medium is positioned between the light source and the light incident surface of the light guide plate. By such a design, a planar light source can be provided.)

1. A front light module, comprising:

a light guide plate comprising:

a top surface;

a bottom surface disposed opposite the top surface; and

a light incident surface adjacent to the top surface and the bottom surface; the light source is arranged beside the light incident surface, and a first section difference is formed between the top surface of the light source and the top surface of the light guide plate; and

and the light guide medium is positioned between the light source and the light incident surface of the light guide plate.

2. The front light module as recited in claim 1, further comprising:

a housing having a bottom plate and an extension at an edge of the bottom plate, wherein the light source is positioned above the bottom plate, and a top surface of the extension is substantially flush with the top surface of the light guide plate.

3. The front light module of claim 2, wherein the extension abuts the light incident surface of the light guide plate.

4. The front light module as recited in claim 1, further comprising:

and the adhesive layer is adhered to the light guide medium and the light incident surface of the light guide plate, wherein the refractive index of the adhesive layer is in the range of 1.4-1.6.

5. The front light module of claim 1, wherein a top surface of the light guide medium and the top surface of the light guide plate have a second step therebetween.

6. The front light module of claim 1, wherein the surface of the light guide medium comprises a plurality of microstructures.

7. The front light module according to claim 1, wherein the material of the light guide plate comprises glass.

8. The front light module of claim 1, wherein the light guide plate comprises a plurality of microstructures, the plurality of microstructures being located on the top surface of the light guide plate.

9. A display device, comprising:

a light guide plate comprising:

a top surface;

a bottom surface opposite the top surface; and

the light incident surface is adjacent to the top surface and the bottom surface; the light source is arranged beside the light incident surface, and a first section difference is formed between the top surface of the light source and the top surface of the light guide plate; a light guide medium located between the light source and the light incident surface of the light guide plate; and

and the reflective display panel is positioned on the bottom surface of the light guide plate.

10. The display device of claim 9, further comprising:

a housing having a bottom plate and an extension at an edge of the bottom plate, wherein the light source is located on the bottom plate, and a top surface of the extension is substantially flush with the top surface of the light guide plate.

11. The display device according to claim 9, wherein the extension portion abuts against the light incident surface of the light guide plate.

12. The display device of claim 9, further comprising:

and the adhesive layer is adhered to the light guide medium and the light incident surface of the light guide plate, wherein the refractive index of the adhesive layer is in the range of 1.4-1.6.

13. The display device according to claim 9, wherein a top surface of the light guide medium and the top surface of the light guide plate have a second level difference therebetween.

14. The display device of claim 9, further comprising:

and the adhesive layer is adhered to the reflective display panel and the bottom surface of the light guide plate, wherein the refractive index of the adhesive layer is in the range of 1.3-1.5.

15. The display device of claim 14, wherein the reflective display is positioned between the backplane and the glue layer.

16. The display device according to claim 9, wherein a material of the light guide plate comprises glass.

17. The display apparatus of claim 9, wherein the light-guiding medium comprises a plurality of microstructures.

18. The display device according to claim 9, wherein a top surface of the light guide medium and the top surface of the light guide plate have a second level difference therebetween.

19. The display device of claim 9, further comprising:

at least one sensor is positioned between the reflective display panel and the bottom plate.

Technical Field

The invention relates to a front light module and a display device.

Background

Reflective display devices are used in a wide variety of applications, for example, in outdoor applications such as road lighting, large outdoor signs, traffic lights and related applications. The reflective display device includes a light guide plate, a display panel and a light source module, wherein the light guide plate has a size larger than that of the display panel in order to obtain a good display uniformity, and an optical auxiliary material is attached to a blank area of the light guide plate to reduce light or provide a reflection function, so as to obtain a better display image. The reflective display device further includes an external chassis to protect the light source module. However, since the external case is required to cover the light source module, the external case and the light guide plate are not located on the same horizontal plane, and thus the reflective display device cannot be designed in a full-plane manner.

Disclosure of Invention

Embodiments of the present invention provide a front light module that can provide a planar light source.

The front light module comprises a light guide plate, a light source and a light guide medium. The light guide plate comprises a top surface, a bottom surface and a light incident surface. The bottom surface is arranged opposite to the top surface. The light incident surface is adjacent to the top surface and the bottom surface. The light source is arranged beside the light incident surface, and a first section difference is formed between the top surface of the light source and the top surface of the light guide plate. The light guide medium is positioned between the light source and the light incident surface of the light guide plate.

In an embodiment of the invention, the front light module further includes a housing. The housing has a base plate and an extension at an edge of the base plate. The light source is positioned above the bottom plate, and the top surface of the extension part is substantially flush with the top surface of the light guide plate.

In an embodiment of the invention, the extending portion abuts against the light incident surface of the light guide plate.

In an embodiment of the invention, the front light module further includes a glue layer. The adhesive layer is adhered to the light guide medium and the light incident surface of the light guide plate, and the refractive index of the adhesive layer is in the range of 1.4 to 1.6.

In an embodiment of the invention, a second step is formed between the top surface of the light guide medium and the top surface of the light guide plate.

In an embodiment of the invention, a surface of the light guide medium includes a plurality of microstructures.

In an embodiment of the invention, a material of the light guide plate includes glass.

In an embodiment of the invention, the light guide plate includes a plurality of microstructures, and the microstructures are located on a top surface of the light guide plate.

Embodiments of the present invention provide a display device, which has a good display effect because the display screen is a full plane.

The display device comprises a light guide plate, a light source, a light guide medium and a reflective display panel. The light guide plate comprises a top surface, a bottom surface and a light incident surface. The bottom surface is arranged opposite to the top surface. The light incident surface is adjacent to the top surface and the bottom surface. The light source is arranged beside the light incident surface, and a first section difference is formed between the top surface of the light source and the top surface of the light guide plate. The light guide medium is positioned between the light source and the light incident surface of the light guide plate. The reflective display panel is located on the bottom surface of the light guide plate.

In an embodiment of the invention, the display device further includes a housing. The shell is provided with a bottom plate and an extension part positioned on the edge of the bottom plate, the light source is positioned on the bottom plate, and the top surface of the extension part is substantially flush with the top surface of the light guide plate.

In an embodiment of the invention, the extending portion abuts against the light incident surface of the light guide plate.

In an embodiment of the invention, the display device further includes a glue layer. The adhesive layer is adhered to the light guide medium and the light incident surface of the light guide plate, and the refractive index of the adhesive layer is in the range of 1.4 to 1.6.

In an embodiment of the invention, a second step is formed between the top surface of the light guide medium and the top surface of the light guide plate.

In an embodiment of the invention, the display device further includes a glue layer. The adhesive layer is adhered to the bottom surfaces of the reflective display panel and the light guide plate, wherein the refractive index of the adhesive layer is in a range of about 1.3 to 1.5.

In an embodiment of the invention, the reflective display is located between the bottom plate and the adhesive layer.

In an embodiment of the invention, a material of the light guide plate includes glass.

In an embodiment of the invention, the light guide medium includes a plurality of microstructures.

In an embodiment of the invention, a second step is formed between the top surface of the light guide medium and the top surface of the light guide plate.

In an embodiment of the invention, the display device further includes at least one sensor. The sensor is located between the reflective display panel and the bottom plate.

Based on the above, the first step is formed between the top surface of the light source and the top surface of the light guide plate, so that the housing can be disposed in a sufficient space, and the top surface of the extension portion of the housing is substantially flush with the top surface of the light guide plate. Therefore, the front light module can provide a full-plane surface light source, and the display screen of the display device is full-plane, so that the display device has a good display effect.

Drawings

Various embodiments of the invention can be understood by reading the following detailed description in conjunction with the accompanying drawings. It is noted that the various features of the drawings are not to scale in accordance with standard practice in the industry. In fact, the dimensions of the features described may be arbitrarily increased or reduced for clarity of discussion.

Fig. 1 is a perspective view illustrating a front light module according to an embodiment of the invention.

Fig. 2 is a cross-sectional view of the front light module of fig. 1 taken along a cross-sectional line 1-1.

Fig. 3 is a schematic perspective view illustrating a display device according to an embodiment of the invention.

Fig. 4 shows a cross-sectional view of the display device of fig. 3 along the cross-sectional line 3-3.

Description of the main reference numerals:

1-1-section line, 3-3-section line, 10-front light module, 20-display device, 100-light guide plate, 100 a-top surface, 100B-bottom surface, 100 c-light incident surface, 102-light source, 102 a-top surface, 104-light guide medium, 104 a-top surface, 104B-bottom surface, 104 c-side surface, 106-glue layer, 108-shell, 108A-bottom plate, 108B-extension portion, 108B 1-support portion, 108B 2-shielding portion, 110-glue layer, 112-reflective display panel, 114-sensor, L-light beam, M1-microstructure, M2-microstructure, S1-first step, S2-second step, SP-containing space.

Detailed Description

In the following description, numerous implementation details are set forth in order to provide a thorough understanding of various embodiments of the invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, for the sake of simplicity, some conventional structures and elements are shown in the drawings in a simple schematic manner.

Fig. 1 is a perspective view of a front light module 10 according to an embodiment of the present invention. Fig. 2 is a cross-sectional view of the front light module 10 of fig. 1 taken along section line 1-1. Referring to fig. 1 and fig. 2, the front light module 10 includes a light guide plate 100, a light source 102 and a light guide medium 104. In the present embodiment, the light source 102 is a light emitting strip composed of a plurality of Light Emitting Diodes (LEDs) and adapted to provide the light beam L, and the LEDs are electrically connected in series and parallel. In other embodiments, the light source 102 may be a light bar of other kinds of light emitting elements.

Specifically, the light guide plate 100 includes a top surface 100a, a bottom surface 100b, and a light incident surface 100c, wherein the bottom surface 100b is disposed opposite to the top surface 100a, and the light incident surface 100c is adjacent to the top surface 100a and the bottom surface 100 b. The light source 102 is disposed beside the light incident surface 100c, so that the light beam L provided by the light source 102 enters the light guide plate 100 through the light incident surface 100c of the light guide plate 100, thereby forming a side-entry front light module. The light guide medium 104 is located between the light source 102 and the light incident surface 100c of the light guide plate 100. The surface (e.g., the top surface 104a, the bottom surface 104b and/or the side surface 104c) of the light guide medium 104 includes a plurality of microstructures M1 (e.g., dots or V-shaped grooves), and after the light beam L from the light source 102 enters the light guide medium 104, the microstructures M1 transmit the light beam L toward the light guide plate 100. In the embodiment, the light incident surface 100c of the light guide plate 100 is substantially perpendicular to the top surface 100a and the bottom surface 100b, but the invention is not limited thereto.

The front light module 10 further includes an adhesive layer 106, the adhesive layer 106 is adhered to the light guide medium 104 and the light incident surface 100c of the light guide plate 100 to fix the light guide medium 104 on the light incident surface 100c, wherein a refractive index of the adhesive layer 106 is approximately in a range of 1.44 to 1.5 to match a refractive index of the light guide plate 100 and a refractive index of the light guide medium 104, so as to facilitate transmission of the light beam L to the light incident surface 100c of the light guide plate 100. The adhesive layer 106 may be an Optically Clear Resin (OCR) or an Optically Clear Adhesive (OCA). The adhesive layer 106 is coated between the light guide medium 104 and the light incident surface 100c of the light guide plate 100, and is cured by a curing process. In this embodiment, the light guide medium 104 may be glass, such as soda lime glass, low-iron glass (super white glass), aluminosilicate glass, borosilicate glass, or plastic material, such as polymethyl methacrylate (PMMA), Polycarbonate (PC), and polymethyl methacrylate-styrene (MS).

In the embodiment, the light guide plate 100 may have a plurality of microstructures M2 located on the top surface 100a, and the microstructures M2 may destroy total reflection (total reflection) of the light beam L in the light guide plate 100, so that the light beam L is refracted in a direction toward a lower display panel (not shown). For example, the microstructure M2 may be formed by performing a surface treatment on the top surface 100a of the light guide plate 100 to roughen the top surface 100 a. The surface treatment includes, but is not limited to, spraying an anti-glare film (anti glare coating), spray etching, or other suitable etching methods.

In the present embodiment, the front light module 10 includes a housing 108, and the housing 108 has a bottom plate 108A and an extension 108B located at an edge of the bottom plate 108A, and the extension 108B surrounds the light guide plate 100. The light source 102 is located above the bottom plate 108A, the extending portion 108B has a supporting portion 108B1 and a shielding portion 108B2 perpendicular to each other, the supporting portion 108B1 is located on the bottom plate 108A, the light source 102 is located between the supporting portion 108B1 and the light incident surface 100c of the light guide plate 100, and the shielding portion 108B2 covers the light source 102, so the housing 108 has functions of protecting and fixing the light source 102. In one embodiment, the housing 108 is made of a light reflective material, so that part of the light emitted from the light source 102 toward the housing 108 can be reflected to the light incident surface 100c of the light guide plate 100, thereby increasing the incident light quantity of the light incident surface 100c of the light guide plate 100, and thus enhancing the brightness of the front light module 10. For example, the housing 108 may comprise a metal or alloy.

The first difference S1 between the top surface 102a of the light source 102 and the top surface 100a of the light guide plate 100 and the second difference S2 between the top surface 104a of the light guide medium 104 and the top surface 100a of the light guide plate 100 can provide enough space for disposing the auxiliary material (such as the housing 108) with light reflectivity or protection function. Thus, the top surface of the extension portion 108B of the housing 108 is substantially flush with the top surface 104a of the light guide plate 100, which is more beautiful. In the present embodiment, the extending portion 108B may abut against the light incident surface 100c of the light guide plate 100. The housing 108 and the light guide plate 100 form a receiving space SP for disposing a reflective display panel 112 (see fig. 4), which will be described in detail later. Thus, the front light module 10 can provide a planar surface light source, and provide a good display effect for the display device.

In the present embodiment, the material of the light guide plate 100 includes glass, so that the light guide plate 100 has good structural strength and weather resistance, and the front light module 10 can be applied to an outdoor lighting device. The light guide plate 100 has both functions of light guiding and protecting cover plate, and no additional protecting cover plate is required to be disposed on the top surface 100a of the light guide plate 100, so that the display surface can maintain a full plane, and a good display effect is provided. For example, the light guide plate 100 may include soda-lime glass, low-iron glass (ultra-white glass), aluminosilicate glass, and/or borosilicate glass.

Fig. 3 is a schematic perspective view of a display device 20 according to an embodiment of the invention. Fig. 4 is a cross-sectional view of the display device 20 of fig. 3 taken along section line 3-3. Referring to fig. 3 and 4, the display device 20 includes a light guide plate 100, a light source 102, a light guide medium 104, an adhesive layer 106, a housing 108, and a reflective display panel 112. The configuration of the light guide plate 100, the light source 102, the light guide medium 104, the adhesive layer 106 and the housing 108 is the same as that of the front light module 10 in the embodiment of fig. 1 and 2, and will not be described again. The display device 20 having the front light module 10 of the present invention has a planar surface light source, and the display screen of the display device 20 is made to be planar, so that the display device 20 has a good display effect.

The reflective display panel 112 is located on the bottom surface 100b of the light guide plate 100, the light beam L passes through the light guide plate 100 and is refracted toward the reflective display panel 112, and the display device 20 reflects the light from the light guide plate 100 to the viewer through the reflective display panel 112, thereby achieving the effect of displaying the image.

The reflective display panel 112 is disposed in the accommodating space SP, and in the embodiment, the display device 20 further includes an adhesive layer 110, and the adhesive layer 110 is adhered to the reflective display panel 112 and the bottom surface 100b of the light guide plate 100 to fix the reflective display panel 112 and the light guide plate 100. Further, the reflective display panel 112 is disposed between the adhesive layer 110 and the bottom plate 108A, and the bottom plate 108A can provide a function of protecting the reflective display panel 112. For example, the adhesive layer 110 may be an Optical Clear Resin (OCR) or an Optical Clear Adhesive (OCA). The adhesive layer 110 is coated between the reflective display panel 112 and the bottom surface 100b of the light guide plate 100, and cured through a curing process. In the present embodiment, the adhesive layer 110 includes a low refractive index material, and specifically, the refractive index of the adhesive layer 110 is approximately in the range of 1.38 to 1.43, so that the light beam L travels in the light guide plate 100 with total reflection. The reflective display panel 112 includes a glass fiber composite substrate or a glass material. The reflective display panel 112 may be a single reflective display panel or a plurality of reflective display panels.

In one embodiment, the display device 20 further includes at least one sensor 114. The sensor 114 is located between the reflective display panel 112 and the bottom plate 108A. In one embodiment, the sensor 114 is a photo sensor 114(photo sensor), so that the display device 20 can adjust the display brightness thereof in real time according to the ambient light 102 sensed by the photo sensor 114. In one embodiment, the sensor 114 is a gravity sensor 114(g-sensor) capable of sensing a rotation state of the display device 20, such as an upright state or a flat state. In one embodiment, the number of sensors 114 is multiple.

In summary, in the front light module according to the embodiments of the present invention, a first step is formed between the top surface of the light source and the top surface of the light guide plate, and a second step is formed between the top surface of the light guide medium and the top surface of the light guide plate. Therefore, a sufficient space for arranging the housing can be provided, and the top surface of the extension part of the housing is substantially flush with the top surface of the light guide plate. Thus, the front light module can provide a planar light source. In addition, a first level difference is formed between the top surface of the light source of the display device and the top surface of the light guide plate, and a second level difference is formed between the top surface of the light guide medium and the top surface of the light guide plate. Therefore, enough space can be provided for arranging the shell, the top surface of the extension part of the shell is substantially flush with the top surface of the light guide plate, and thus, the display screen of the display device is full-plane, and therefore, the display device has a good display effect.

The foregoing has outlined features of several embodiments or examples in order that those skilled in the art may better understand the present invention from a variety of aspects. It should be appreciated by those skilled in the art that other processes and structures can be readily devised or modified based on the present invention to achieve the same purposes and/or to achieve the same advantages of the embodiments or examples described herein. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the disclosure. Various changes, substitutions, and alterations can be made hereto without departing from the spirit and scope of the present invention.