阅读说明：本技术 电子装置以及显示设备 (Electronic device and display apparatus ) 是由 郑百乔 蔡宗翰 于 2017-08-30 设计创作，主要内容包括：本发明公开了一种电子装置以及一种显示设备。电子装置包括光源以及光转换元件。光转换元件邻近光源设置,光转换元件具有相对的第一表面与第二表面,第一表面邻近光源,且第二表面远离光源。第一表面具有第一光泽度,第二表面具有第二光泽度,且第一光泽度小于第二光泽度。显示设备包括显示面板以及背光模块。背光模块与显示面板对应设置,且背光模块包括光源以及光转换元件。光转换元件邻近光源设置,光转换元件具有相对的第一表面与第二表面,第一表面邻近光源,且第二表面远离光源。第一表面具有第一光泽度,第二表面具有第二光泽度,且第一光泽度小于第二光泽度。(The invention discloses an electronic device and a display device. The electronic device includes a light source and a light conversion element. The light conversion element is arranged adjacent to the light source and has a first surface and a second surface which are opposite, the first surface is adjacent to the light source, and the second surface is far away from the light source. The first surface has a first gloss, the second surface has a second gloss, and the first gloss is less than the second gloss. The display device comprises a display panel and a backlight module. The backlight module is arranged corresponding to the display panel and comprises a light source and a light conversion element. The light conversion element is arranged adjacent to the light source and has a first surface and a second surface which are opposite, the first surface is adjacent to the light source, and the second surface is far away from the light source. The first surface has a first gloss, the second surface has a second gloss, and the first gloss is less than the second gloss.)

1. An electronic device, comprising:

a light source; and

a light conversion element disposed adjacent to the light source, the light conversion element having a first surface and a second surface opposite to each other, the first surface being adjacent to the light source, and the second surface being far away from the light source, wherein the first surface has a first glossiness, the second surface has a second glossiness, the first glossiness is smaller than the second glossiness, and the first glossiness and the second glossiness satisfy the following relation:

wherein B represents the value of the first glossiness, T represents the value of the second glossiness, and the units of the first glossiness and the second glossiness are glossiness units.

2. The electronic device of claim 1, wherein the second gloss level is greater than or equal to 40 gloss level units and less than or equal to 135 gloss level units.

3. The electronic device of claim 1, wherein the light conversion element comprises a first layer, a second layer and a third layer, the second layer is disposed between the first layer and the third layer, and the second layer comprises a light conversion material.

4. The electronic device of claim 3, wherein the light conversion material is a quantum dot material.

5. The electronic device of claim 1, further comprising a light guide plate disposed adjacent to the light source.

6. The electronic device according to claim 5, further comprising a display panel, wherein the light source is disposed at a side of the light guide plate, and at least a portion of the light conversion element is disposed between the light guide plate and the display panel.

7. The electronic device of claim 1, further comprising a display panel and a substrate, wherein the substrate is disposed corresponding to the display panel, the light source is disposed on the substrate, and at least a portion of the light conversion element is disposed between the display panel and the light source.

Technical Field

The present invention relates to an electronic device and a display apparatus, and more particularly, to an electronic device having a light conversion element and a display apparatus having a light conversion element.

Background

In recent years, liquid crystal display devices and various electronic products provided with liquid crystal display panels, such as mobile phones, tablet computers, wearable devices, and the like, have been designed to be thinner. Therefore, most of the backlight modules for providing backlight are replaced by Light Emitting Diodes (LEDs) as light source generators instead of conventional Cold Cathode Fluorescent Lamps (CCFLs), thereby achieving the purpose of reducing the size of the backlight module. Since most of the backlight sources required in the conventional flat panel display are white light sources, but the problems of poor color purity, complex structure or high manufacturing cost of the conventional white light emitting diode still need to be solved, the conventional white light emitting diode also utilizes the mode of exciting the photoluminescence material by using the blue light generated by the blue light emitting diode to generate the white light by mixing the light. The conversion efficiency of the photoluminescent material directly affects the light conversion efficiency of the backlight module, and therefore how to improve the conversion efficiency through innovative changes in design is a subject of continuous efforts of people in the related art.

Disclosure of Invention

An objective of the present invention is to provide an electronic device and a display apparatus, which improve the conversion efficiency of a light conversion element by adjusting the surface gloss of the light conversion element, so as to improve the light conversion efficiency of the electronic device and the light conversion efficiency of a backlight module in the display apparatus.

An embodiment of the invention provides an electronic device, which includes a light source and a light conversion element.

The light conversion element is arranged adjacent to the light source and has a first surface and a second surface which are opposite, the first surface is adjacent to the light source, and the second surface is far away from the light source. The first surface has a first glossiness, the second surface has a second glossiness, and the first glossiness is less than the second glossiness.

An embodiment of the invention provides a display device, which includes a display panel and a backlight module. The backlight module is arranged corresponding to the display panel and comprises a light source and a light conversion element. The light conversion element is arranged adjacent to the light source and has a first surface and a second surface which are opposite, the first surface is adjacent to the light source, and the second surface is far away from the light source. The first surface has a first glossiness, the second surface has a second glossiness, and the first glossiness is less than the second glossiness.

Drawings

Fig. 1 is a schematic view of a display device according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of the light-emitting wavelength distribution of the backlight module according to the first embodiment of the present invention;

FIG. 3 is a diagram illustrating the conversion efficiency between the first gloss level and the second gloss level according to the first embodiment of the present invention;

FIG. 4 is a schematic view of a display device according to a second embodiment of the present invention;

fig. 5 is a schematic view of a display device according to a third embodiment of the present invention;

fig. 6 is a schematic view of a display device according to a fourth embodiment of the present invention;

fig. 7 is a schematic view of a display device according to a fifth embodiment of the present invention;

fig. 8 is a schematic view of a display device according to a sixth embodiment of the present invention;

fig. 9 is a schematic view of an electronic device according to a seventh embodiment of the invention.

Description of reference numerals: 10-a backlight module; 11-a light source; 11A-a light emitting unit; 12-a light guide plate; 12A-side; 12B — upper surface; 12C-lower surface; 13-a substrate; 15-a light conversion element; 15A-first layer; 15B-a second layer; 15C — a third layer; 19-a light converting material; 20-a display panel; 20S-the lower surface of the display panel; 101-; 201-an electronic device; d1-first direction; d2-second direction; l1 — first ray; l2 — second ray; p1-first peak; p2-second peak; r1 — first line of relationship; r2-second line of relationship; r3-third line of relationship; s1 — first surface; s2 — second surface.

Detailed Description

In order to make those skilled in the art to which the invention pertains understand the present invention, the following embodiments of the present invention are specifically illustrated in the accompanying drawings, and the detailed description of the constituents and intended effects of the invention will be given. These examples are not intended to limit the invention. Furthermore, it will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, regions, steps, operations, and/or elements, but do not preclude the presence or addition of one or more other features, regions, steps, operations, elements, and/or groups thereof. It will be understood that when an element such as a layer or region is referred to as being "on" or extending "onto" another element (or variations thereof), it can be directly on or extend directly onto the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or extending "directly onto" another element (or variations thereof), there are no intervening elements present. It will also be understood that when an element is referred to as being "coupled" to another element (or variations thereof), it can be directly connected to the other element or be indirectly connected (e.g., electrically connected) to the other element through one or more other elements.

Please refer to fig. 1. Fig. 1 is a schematic view showing a display device according to a first embodiment of the present invention. As shown in fig. 1, the present embodiment provides a display device 101, and the display device 101 includes a display panel 20 and a backlight module 10. The display panel 20 is disposed corresponding to the backlight module 10. In some embodiments, the backlight module 10 may be disposed adjacent to the lower surface 20S of the display panel 20 for providing light toward the display panel 20, and the display panel 20 may include a liquid crystal display panel, an electro-wetting (electro-wetting) display panel, or other suitable non-self-luminous display panel. In some embodiments, the display device 101 may be a flexible display device (flexible display), a touch display device (touch display), or a curved display device (curved display), but is not limited thereto. The backlight module 10 may include a light source 11 and a light conversion element 15, the light conversion element 15 being disposed adjacent to the light source 11. In some embodiments, the light source 11 may include a Light Emitting Diode (LED), a micro LED, a quantum dot (quantum dot) material, a fluorescent (fluorescent) material, a phosphorescent (phosphor) material, other suitable light sources, or a combination thereof, but is not limited thereto. In addition, an optical film (not shown), such as a diffusion film, a brightness enhancement film, or/and a polarizer, may be disposed between the backlight module 10 and the display panel 20 as needed, but not limited thereto. The light conversion device 15 may be a film containing a light conversion material, a flexible film containing a light conversion material, or a light conversion device formed by packaging a light conversion material in a container, and the light conversion device 15 may include a single-layer or multi-layer material stack structure, but is not limited thereto. The light conversion material may include Quantum Dot (QD) material, fluorescent (fluorescent) material, phosphorescent (phor) material, other suitable photoluminescent material, or a combination thereof, but is not limited thereto. The light conversion element 15 has a first surface S1 and a second surface S2 opposite to each other, the first surface S1 is adjacent to the light source 11, and the second surface S2 is away from the light source 11. The first surface S1 has a first gloss, the second surface S2 has a second gloss, and the first gloss is less than the second gloss. The gloss is a physical quantity measured for the properties of the surface of a material under conditions that meet the specifications of international standards, and may be in units of Gloss Units (GU). The measurement may be performed according to international standards such as ISO 2813, ISO 7668, ASTM D523, ASTM D2457, DIN 67530, JIS Z8741, and the like. The gloss meter used in the measurement must meet at least one of the above international standards. For example, a standard is first calibrated by a gloss meter during measurement, wherein the gloss of the standard (n ═ 1.567) is defined as 100 GU. And then, measuring the sample by using the corrected gloss meter, and comparing and converting the measurement result of the sample with the standard by using the gloss meter to obtain the gloss of the sample. In one embodiment, the standard is a highly polished black glass (e.g., barium crown glass, BaK50) with a flat top surface, the black glass has an n value of 1.567 as measured by sodium D line (wavelength 589.3 nm), and the gloss measurement of the black glass is defined as 100 GU.

The first surface S1 of the light conversion element 15 can be regarded as a light incident surface of the light conversion element 15, and the second surface S2 of the light conversion element 15 can be regarded as a light emitting surface of the light conversion element 15, but not limited thereto. After the light emitted from the light source 11 (e.g., the first light L1 shown in fig. 1) enters the light conversion element 15 from the first surface S1 of the light conversion element 15, the light may react (e.g., excite, filter, or enhance) with the light conversion material in the light conversion element 15 to emit a second light L2 different from the first light L1 at the second surface S2 of the light conversion element 15, thereby achieving the light conversion effect. For example, the first light L1 may be blue light, the light conversion material in the light conversion element 15 may convert the blue light into light of other colors (e.g., red light and green light), and a portion of the first light L1 may penetrate through the light conversion element 15 to form a second light (e.g., white light) with a color mixture with the light of other colors converted by the light conversion element 15, but not limited thereto. In some embodiments, the color of the first light L1 and/or the light conversion material in the light conversion element 15 can be adjusted according to the required light conversion efficiency of the backlight module to obtain the required second light L2. In one embodiment, the light conversion element includes a light conversion material capable of converting the color of the excitation light into another color, and in other embodiments, the light conversion element includes a light conversion material capable of converting the color of the excitation light into a plurality of color lights, and the type and proportion of the light conversion material are selected according to the requirement, but not limited thereto. The characteristic of the first surface S1 of the light conversion element 15 facing the light source 11 affects the path of the first light L1 entering the light conversion element 15 and then the light conversion element 15, and when the first glossiness of the first surface S1 is reduced, the condition (such as the incident light path or the incident light uniformity) of the first light L1 entering the light conversion element 15 from the first surface S1 is improved. On the other hand, when the second glossiness of the second surface S2 is increased, the first light L1 that enters the light conversion element 15 and is not converted by the light conversion material may be partially reflected to reenter the light conversion element 15 to increase the chance of being converted by the light conversion material. Therefore, when the first glossiness of the first surface S1 is relatively low and the second glossiness of the second surface S2 is relatively high, the light conversion element 15 has a high conversion efficiency, so the first glossiness needs to be smaller than the second glossiness. However, when the second glossiness of the second surface S2 is too high, the probability of reflection is too high, and the light output amount is reduced, so the first glossiness of the first surface S1 and the second glossiness of the second surface S2 should have a better design range.

Please refer to fig. 1 to fig. 3. Fig. 2 is a schematic diagram illustrating a wavelength distribution of light output from the backlight module 10 of the present embodiment, and fig. 3 is a schematic diagram illustrating a conversion efficiency corresponding to the first glossiness and the second glossiness of the present embodiment. Fig. 2 shows a wavelength distribution of the second light L2, wherein the first peak P1 corresponds to blue light and the second peak P2 corresponds to green light, and a conversion efficiency R can be defined as a ratio of green light intensity and blue light intensity in the second light L2 (e.g., R ═ IG/IB, IG represents green light intensity and IB represents blue light intensity). In other words, when the first light L1 is blue light and the light conversion material in the light conversion element 15 converts the blue light into red light and green light, the conversion performance of the light conversion element 15 can be evaluated by the above conversion efficiency R. It should be noted that, as shown in the wavelength distribution of fig. 2, the second light L2 emitted by the backlight module 10 after passing through the light conversion element 15 is measured, and the second light L2 does not pass through the display panel 20. In addition, fig. 3 shows the conversion efficiency R exhibited by different first gloss levels and second gloss levels, and in one embodiment, the distribution of fig. 3 can be represented by the following regression equation:

wherein a is₀＝0.29939，a₁＝-0.0025454，a₂＝0.0041898，a₃＝-0.00001273，a₄-0.11051, B represents the value of the first gloss (in GU) and T represents the value of the second gloss (in GU). Then, after partial differentiation is performed on T by the regression equation, the relationship between the maximum value of the conversion efficiency R and T and B can be found, and the following relational expression (I) can be obtained:

the relationship (I) can be collated:

that is to sayIn other words, the second gloss level T may be considered as a function related to the first gloss level B. Then, a is added₂、a₃And a₄Substituting the values of (c) into (d) and taking into account process variations (e.g., about ± 15GU), the following relationship (II) can be obtained:

the first relation line R1 in fig. 3 may correspond to the condition of the relation (I), and the range between the second relation line R2 and the third relation line R3 in fig. 3 may correspond to the condition of the relation (II). In other words, the first gloss level B and the second gloss level T can be calculated according to the relation (II) to obtain a combination of the first gloss level B and the second gloss level T that can exhibit a better conversion efficiency. In other words, if the value of the first glossiness B is determined, the range of the second glossiness T can be calculated by the above-described relational expression (II). In addition, considering the above relation (II) and the feasibility of the process, the first gloss level B may be greater than or equal to 35 gloss units and less than or equal to 130 gloss units, and the second gloss level T may be greater than or equal to 40 gloss units and less than or equal to 135 gloss units, but not limited thereto. The first glossiness B and the second glossiness T can be adjusted to satisfy the above-mentioned relation (II) by adjusting the material composition contained in the light conversion element 15 or the conditions of the designed first surface S1 and second surface S2, so that the light conversion element 15 can have better conversion efficiency, thereby improving the light conversion efficiency of the backlight module 10.

The following description will mainly describe different parts of each embodiment, and in order to simplify the description, the description will not repeat the description of the same parts. In addition, the same elements in the embodiments of the present invention are denoted by the same reference numerals to facilitate comparison between the embodiments.

Please refer to fig. 4. Fig. 4 is a schematic diagram of a display device 102 according to a second embodiment of the invention. As shown in fig. 4, the difference between the first embodiment and the second embodiment is that the backlight module 10 of the present embodiment further includes a light guide plate 12 disposed adjacent to the light source 11, the light source 11 is disposed on a side surface 12A of the light guide plate 12, and at least a portion of the light conversion element 15 is disposed between the light guide plate 12 and the display panel 20. In other words, the normal direction of the upper surface 12B (light emitting surface) of the light guide plate 12 may be a second direction D2, a first direction D1 is perpendicular to the second direction D2, the light source 11 may be disposed on at least one side surface of the light guide plate 12 in the first direction D1, the light conversion element 15 may be disposed on the upper surface 12B of the light guide plate 12 facing the display panel 20 in the second direction D2, and the second direction D2 may be regarded as the thickness direction of the light guide plate 12, but not limited thereto. Therefore, the backlight module of the present embodiment can be regarded as a side-in type backlight module. In addition, the light guide plate 12 may include, but is not limited to, a light guide plate formed of a glass material, a polymer material such as acryl (polymethyl methacrylate, PMMA), other materials that can resist the high temperature generated by the light source 11, or other materials suitable for the light guide plate, and the shape of the light guide plate 12 may include, but is not limited to, a regular shape, an irregular shape, and/or an asymmetrical shape.

Please refer to fig. 5. Fig. 5 is a schematic diagram of a display device 103 according to a third embodiment of the present invention. As shown in fig. 5, the light conversion element 15 of the present embodiment is different from the first embodiment in that the light conversion element 15 may include a multi-layer structure, for example, the light conversion element 15 may include a first layer 15A, a second layer 15B and a third layer 15C, the second layer 15B may be disposed between the first layer 15A and the third layer 15B in the second direction D2, and the second layer 15B may include a light conversion material 19 therein. In some embodiments, the light conversion material 19 may include quantum dot materials, fluorescent materials, phosphorescent materials, other suitable photoluminescent materials, or combinations thereof, but is not limited thereto. In addition, the first layer 15A or the third layer 15C may include a protective layer for protecting the second layer 15B with the light conversion material 19, but not limited thereto. In some embodiments, the first layer 15A, the second layer 15B, and the third layer 15C may be formed of the same material, or the material of the second layer 15B may be different from the material of the first layer 15A or the third layer 15C, but not limited thereto. In other embodiments, the material of the second layer 15B may have a similar refractive index to the material of the first layer 15A or the third layer 15C, or the refractive index of the material of the second layer 15B may be greater than the refractive index of the material of the third layer 15C, but not limited thereto. For example, if the protective effect of the first layer 15A or the third layer 15C is considered, the first layer 15A or the third layer 15C may be formed by protecting a material with higher strength, such as a polymer (polymer) material, and the second layer 15B may be formed by selecting a material that is easier to uniformly mix with the light conversion material 19, such as a resin (resin) material, but not limited thereto. In addition, the first glossiness of the first surface S1 and the second glossiness of the second surface S2 can be controlled by the material selection of the first layer 15A and the third layer 15C, the film forming condition and/or the surface condition, respectively.

Please refer to fig. 6 and fig. 7. Fig. 6 is a schematic diagram of a display device 104 according to a fourth embodiment of the present invention, and fig. 7 is a schematic diagram of a display device 105 according to a fifth embodiment of the present invention. As shown in fig. 6 and 7, the difference between the above second embodiment is that, in some embodiments, the light conversion element 15 may be disposed on the side surface 12A of the light guide plate 12, and the light conversion element 15 may be disposed between the light guide plate 12 and the light source 11 in the first direction D1. As shown in fig. 6, in some embodiments, the light conversion member 15 may be fixed on the light guide plate 12 as required, and the second surface S2 of the light conversion member 15 may directly contact the side surface 12A of the light guide plate 12, but not limited thereto. In other embodiments, the second surface S2 of the light conversion element 15 can be fixed to the side 12A of the light guide plate 12 by other adhesive layers or other elements. As shown in fig. 7, in some embodiments, the light conversion element 15 may be fixed on the light source 11, and the first surface S1 of the light conversion element 15 may directly contact the light source 11, but is not limited thereto. In other embodiments, the first surface S1 of the light conversion element 15 can be fixed on the light source 11 by other adhesive layers or other elements. It should be noted that, in some embodiments, the light conversion element 15 may be in a thin film type and disposed at least partially on at least a portion of the side surface 12A, at least a portion of the upper surface 12B, or/and at least a portion of the lower surface 12C of the light guide plate 12.

Please refer to fig. 8. Fig. 8 is a schematic diagram of a display device 106 according to a sixth embodiment of the present invention. As shown in fig. 8, the difference between the first embodiment and the second embodiment is that the backlight module 10 of the present embodiment may further include a substrate 13, the substrate 13 may be disposed corresponding to the display panel 20, the light source 11 may be disposed on the substrate 13, and at least a portion of the light conversion element 15 may be disposed between the display panel 20 and the light source 11. In one embodiment, the light conversion element 15 may be a thin film type or a flexible substrate covering the light source 11. For example, the light source 11 may include a plurality of light emitting elements 11A disposed on the substrate 13, and at least a portion of the light conversion element 15 may cover at least one of the plurality of light emitting elements 11A. In some embodiments, the substrate 13 may include a reflective single-layer or multi-layer structure, but is not limited thereto. The substrate 13 may be a glass substrate, a printed circuit board, a flexible substrate, a metal substrate, a back plate, or other devices capable of carrying the light source 11, but not limited thereto. The light emitting element 11A may include, for example, but not limited to, a light emitting diode, a micro light emitting diode, a quantum dot material, a fluorescent material, a phosphorescent material, other suitable light sources, or a combination thereof.

Please refer to fig. 9. Fig. 9 is a schematic diagram of an electronic device 201 according to a seventh embodiment of the invention. As shown in fig. 9, the electronic device 201 may include a light source 11 and a light conversion element 15, and the light conversion element 15 is disposed adjacent to the light source 11. The light conversion element 15 has a first surface S1 and a second surface S2 opposite to each other, the first surface S1 is adjacent to the light source 11, and the second surface S2 is away from the light source 11. The first surface S1 has a first glossiness, the second surface S2 has a second glossiness, and the first glossiness is less than the second glossiness. As described in the above examples, the first gloss level and the second gloss level may conform to the following relationship (II):

wherein B represents a value of the first gloss, T represents a value of the second gloss, and the units of the first gloss and the second gloss are Gloss Units (GU). In some embodiments, the first gloss level may be greater than or equal to 35 gloss units and less than or equal to 130 gloss units, while the second gloss level may be greater than or equal to 40 gloss units and less than or equal to 135 gloss units, but not limited thereto. The related technical features of the light source 11 and the light conversion element 15 have been described in the above embodiments, and therefore are not described herein again. It should be noted that the backlight module 10 in the first to sixth embodiments can be regarded as the electronic device provided by the present invention. For example, as shown in fig. 5, in some embodiments, a light conversion element in an electronic device may include a first layer 15A, a second layer 15B, and a third layer 15C, the second layer 15B may be disposed between the first layer 15A and the third layer 15B in the second direction D2, and the light conversion material 19 may be included in the second layer 15B. However, the electronic device provided by the invention is not limited to be used as a backlight module of a display device, and the electronic device provided by the invention can also be applied to other light-emitting purposes as required.

In summary, in the electronic device and the display apparatus provided by the invention, the surface gloss condition of the light conversion element can be adjusted such that the first gloss of the first surface of the light conversion element adjacent to the light source is lower than the second gloss of the second surface of the light conversion element away from the light source. The lower first glossiness can improve the light-entering path or light-entering uniformity of the light entering the light conversion element, and the higher second glossiness can enable the light which enters the light conversion element and is not converted by the light conversion material to be reflected and re-enter the light conversion element to increase the chance of conversion by the light conversion material. Therefore, the conversion efficiency of the light conversion element can be improved under the condition that the first glossiness is smaller than the second glossiness, and the light conversion efficiency of the electronic device and the backlight module is further improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.