Light enhancement film set and light-emitting device

Abstract

A light enhancement film set and a light-emitting device are disclosed. The light enhancement film set includes a first enhancement film and a second enhancement film. The first enhancement film comprises a plurality of first enhancement structures arranged respectively along a first direction. The second enhancement film is stacked on one side of the first gain plate and includes a first area surface closer to the center and a second area surface closer to the periphery. The first area surface is provided with a plurality of second enhancement structures distributed respectively along a second direction intersecting the first direction, and the second area surface is provided with a plurality of third enhancement structures distributed along a third direction.

Description

[Technical Field]

[0001] This invention relates to a gain diaphragm assembly and a light-emitting device. [Previous Technology]

[0002] In recent years, liquid crystal displays (LCDs) have become the mainstream of various display devices. For example, home televisions, personal computers, laptops, monitors, mobile phones, and digital cameras all heavily utilize LCDs. The backlight module used in LCDs supplies the liquid crystal with a light source that has sufficient brightness and uniform distribution, enabling the LCD to display images properly. However, it is known that backlight modules sometimes have higher brightness near the surrounding area, resulting in uneven overall light emission, which has room for improvement. [Summary of the Invention]

[0003] The purpose of this invention is to provide a gain diaphragm assembly with more uniform brightness.

[0004] Another object of the present invention is to provide a light-emitting device having a more uniform brightness.

[0005] The gain diaphragm assembly of the present invention includes a first gain diaphragm and a second gain diaphragm. The first gain diaphragm includes a plurality of first gain structures respectively distributed along a first direction. The second gain diaphragm is stacked on one side of the first gain diaphragm and includes a first region closer to the center and a second region closer to the periphery. The first region is provided with a plurality of second gain structures respectively distributed along a second direction intersecting the first direction, and the second region is provided with a plurality of third gain structures distributed along a third direction. The brightness gain effect of the gain diaphragm assembly in the vertical projection range of the first region is greater than the brightness gain effect in the vertical projection range of the second region.

[0006] In one embodiment, the first direction is orthogonal to the second direction.

[0007] In one embodiment, the first gain sheet includes a first surface, on which a plurality of first gain structures are disposed, and the second gain sheet includes a second surface that faces the same direction as the first surface, the second surface including a first region and a second region.

[0008] In one embodiment, a third region is further included between the first region and the second region, and the brightness gain effect of the gain diaphragm group in the vertical projection range of the third region is better than the brightness gain effect in the vertical projection range of the second region, and worse than the brightness gain effect in the vertical projection range of the first region.

[0009] In one embodiment, the angle between the first direction and the second direction is closer to 90 degrees than the angle between the first direction and the third direction.

[0010] In one embodiment, the second gain sheet includes a first sub-film and a second sub-film spliced ​​together, the first sub-film and the second sub-film having a first region and a second region, respectively.

[0011] In one embodiment, the second direction is different from the third direction.

[0012] In one embodiment, the third direction is orthogonal to the first direction.

[0013] In one embodiment, the refractive index of the first region is greater than that of the second region.

[0014] In one embodiment, the cross sections of the plurality of second gain structures perpendicular to the first direction are closer to the plurality of continuously distributed complete triangles than the cross sections of the plurality of third gain structures perpendicular to the first direction.

[0015] In one embodiment, the gain film assembly includes a first gain film, a second gain film, and an interface layer. The first gain film includes a plurality of first gain structures distributed along a first direction. The second gain film is stacked on one side of the first gain film and includes a plurality of second gain structures distributed along a second direction orthogonal to the first direction. The interface layer is disposed between the first gain film and the second gain film and includes a fourth region closer to the center and a fifth region closer to the periphery, wherein the transmittance of the fourth region is higher than that of the fifth region. The brightness gain effect of the gain film assembly in the vertical projection range of the fourth region is greater than the brightness gain effect in the vertical projection range of the fifth region.

[0016] In one embodiment, a sixth region is further included between the fourth region and the fifth region, and the brightness gain effect of the gain diaphragm group in the vertical projection range of the sixth region is better than the brightness gain effect in the vertical projection range of the fifth region, and worse than the brightness gain effect in the vertical projection range of the fourth region.

[0017] The light-emitting device of the present invention includes a light source and the aforementioned gain diaphragm group, wherein the gain diaphragm group is disposed on one side of the light source.

[0018] In one embodiment, at least one of the first gain sheet opposite to the first surface and the second gain sheet opposite to the second surface is further stacked to form a haze film.

Implementation Method

[0019] The following describes the implementation of the connection component disclosed in this invention through specific embodiments and accompanying drawings. Those skilled in the art can understand the advantages and effects of this invention from the content disclosed in this specification. However, the following disclosure is not intended to limit the scope of protection of this invention. Without departing from the spirit of the invention, those skilled in the art can implement this invention in other different embodiments based on different viewpoints and applications. In the drawings, the thickness of layers, films, panels, regions, etc., is enlarged for clarity. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected" to another element, it may be directly on or connected to the other element, or an intermediate element may also be present. Conversely, when an element is referred to as being "directly on" or "directly connected" to another element, no intermediate element is present. As used herein, "connection" can refer to physical and / or electrical connection. Furthermore, "electrical connection" or "coupling" can mean that other elements exist between two elements.

[0020] It should be understood that although the terms "first," "second," "third," etc., may be used herein to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, and / or parts should not be limited by these terms. These terms are used only to distinguish one element, component, region, layer, or part from another element, component, region, layer, or part. Therefore, "first element," "component," "region," "layer," or "part" discussed below may be referred to as a second element, component, region, layer, or part without departing from the teachings of this document.

[0021] Furthermore, relative terms such as “down” or “bottom” and “up” or “top” may be used herein to describe the relationship between one element and another element, as shown in the figures. It should be understood that relative terms are intended to include different orientations of the device other than those shown in the figures. For example, if a device in a figure is flipped, an element described as being “down” to another element will be oriented “up” to another element. Thus, the exemplary term “down” can include both “down” and “up” orientations, depending on the specific orientation of the figure. Similarly, if a device in a figure is flipped, an element described as being “below” or “under” another element will be oriented “above” the other element. Thus, the exemplary term “below” or “under” can include both “up” and “down” orientations.

[0022] As used herein, “about,” “approximately,” or “substantially” includes the value and the average value within an acceptable range of deviations from a particular value as determined by one of ordinary skill in the art, taking into account the measurement in question and a particular number of errors associated with the measurement (i.e., limitations of the measurement system). For example, “about” may mean within one or more standard deviations of the value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, as used herein, “about,” “approximately,” or “substantially” may be chosen based on optical, etched, or other properties to select a more acceptable range of deviations or standard deviations, and may not apply to all properties with a single standard deviation.

[0023] As shown in the embodiment of FIG1, the gain diaphragm assembly 800 of the present invention includes a first gain sheet 100 and a second gain sheet 200. Furthermore, the gain diaphragm assembly 800 of the present invention can be combined with a light source 700 disposed on the other side to form the light-emitting device 900 of the present invention. The light source 700 can be a direct-lit light source or an edge-lit light source, and the light-emitting device 900 can be, for example, a backlight module of a liquid crystal display.

[0024] More specifically, as shown in the embodiment of FIG2A, the first gain plate 100 includes a plurality of first gain structures 120 respectively distributed along a first direction 610. The distribution refers to the extension direction of the gain structure. Preferably, the gain structure is a strip structure with a triangular cross-section, such as a prism strip. The second gain plate 200 is stacked on one side of the first gain plate 100. At least one of the other side of the first gain plate 100 relative to the first surface 110 and the other side of the second gain plate 200 relative to the second surface 210 may be further stacked with, for example, a haze film containing particles with light scattering effect, to increase the uniformity of the transmitted light. The second gain plate 200 includes a first region 211 closer to the center and a second region 212 closer to the periphery. In this embodiment, the second region 212 continuously surrounds the first region 211; however, in other embodiments, the second region 212 may be distributed intermittently between the first region 211 and the periphery of the second gain plate 200. Furthermore, the first gain plate 100 includes a first surface 110 on which a plurality of first gain structures 120 are disposed, and the second gain plate 200 includes a second surface 210 facing the same direction as the first surface 110, and the second surface 210 includes the first region 211 and the second region 212.

[0025] As shown in the embodiments of FIG2A and 2B, the first region 211 is provided with a plurality of second gain structures 220 distributed along a second direction 620 intersecting the first direction 610, wherein the first direction 610 and the second direction 620 are preferably orthogonal. The second region 212 is provided with a plurality of third gain structures 230 distributed along a third direction 630, wherein the angle between the first direction 610 and the second direction 620 is closer to 90 degrees than the angle between the first direction 610 and the third direction 630, in other words, the third direction 630 is not orthogonal to the first direction 610, and the angle between the third direction 630 and the first direction 610 is between 30° and 89°. Further, as shown in FIG2B, in this embodiment, the second gain sheet 200 is formed by splicing together diaphragms 201 and 202 having the first region 211 and the second region 212, respectively. Thus, using the same raw material for the film, the extension direction of the gain structure on the first region 211 and the second region 212 can be controlled by selecting the splicing angle and cutting, making manufacturing more economical. However, in different embodiments, the second gain sheet 200 can be integrally formed, and gain structures with the desired extension direction can be formed on the first region 211 and the second region 212 by means of, for example, mechanical cutting, laser cutting, chemical or physical etching. In this case, the brightness gain effect of the gain film assembly 800 in the vertical projection range of the first region 211 is greater than the brightness gain effect in the vertical projection range of the second region 212.

[0026] More specifically, in this embodiment, since the extension directions of the second gain structure 220 and the first gain structure 120 are orthogonal, the light rays passing sequentially through the first region 211 and the first surface 110 are refracted to be perpendicular to the first surface 110, which is a better effect. Conversely, since the extension directions of the third gain structure 230 and the second gain structure 220 are different, that is, the extension directions of the third gain structure 230 and the first gain structure 120 are not orthogonal, the light rays passing sequentially through the second region 212 and the first surface 110 are refracted to be perpendicular to the first region 211, which is a less desirable effect. In other words, light rays passing through the first region 211, which is closer to the center of the second surface 210, are more directly incident on the side facing the first surface 110 of the gain diaphragm group 800, while light rays passing through the second region 212, which is closer to the periphery of the second surface 210, are less directly incident on the side facing the first surface 110 of the gain diaphragm group 800. Viewed from different angles, the light in the vertical projection range of the second region is actually reduced, achieving the effect of reducing the brightness of the surrounding area, thereby improving the problem of excessive brightness in the surrounding area in the prior art.

[0027] In the embodiments shown in Figures 1 to 2B, the second gain plate 200 is disposed between the first gain plate 100 and the light source 700. Since the second gain plate 200 is formed by splicing films 201 and 202, there may be light leakage at the boundary between the first region 211 and the second region 212 due to the allowance for splicing tolerances. After the light passes through the second gain plate 200, it will be refracted again by the first gain plate 100. Therefore, the light leakage at the boundary between the first region 211 and the second region 212 is less noticeable on the side facing the first surface 110 of the gain film assembly 800. However, in the embodiment shown in Figure 3, based on different requirements such as manufacturing, the second gain plate 200 may be disposed on the side facing the first surface 110 of the first gain plate 100. In other words, the positions of the first gain plate 100 and the second gain plate 200 in this invention are interchangeable.

[0028] As shown in Figure 4, in different embodiments, the third direction 630 can be orthogonal to the first direction 610, that is, the extension directions of the gain structures on the first region 211 and the second region 212 are the same. Viewed from different angles, the second surface 210 of the second gain sheet 200 is provided with gain structures with the same extension direction. However, the first region 211 and the second region 212 have different optical properties, which makes the brightness gain effect of the first surface 110 of the gain film group 800 in the vertical projection range of the first region 211 greater than the brightness gain effect in the vertical projection range of the second region 212.

[0029] More specifically, in one embodiment, by selecting different materials, the refractive index of the first region 211 can be made greater than that of the second region 212. This results in a better effect where light passing sequentially through the first region 211 and the first surface 110 is refracted perpendicularly to the first surface 110, and a lesser effect where light passing sequentially through the second region 212 and the first surface 110 is refracted perpendicularly to the first region 211. Consequently, light passing through the first region 211, which is closer to the center of the second surface 210, is more directly incident on the side of the gain diaphragm assembly 800 facing the first surface 110, while light passing through the second region 212, which is closer to the periphery of the second surface 210, is less directly incident on the side of the gain diaphragm assembly 800 facing the first surface 110. The refractive index n is between 1.4 and 1.7.

[0030] In different embodiments, the brightness gain effect can also be affected by adjusting the construction of the gain structure. More specifically, the cross-sections of the plurality of second gain structures 220 perpendicular to the first direction 610 are made closer to a plurality of continuously distributed complete triangles than the cross-sections of the plurality of third gain structures 230 perpendicular to the first direction 610. For example, after the same gain structure is provided on the second surface 210 of the second gain sheet 200, the height of the third gain structure 230 in the second region 212 can be reduced by up to 50% as shown in FIG. 5A by means such as friction polishing to reduce its refractive effect. Alternatively, the refractive effect can be reduced by filling the spaces between the third gain structures 230 in the second region 212 as shown in FIG. 5B.

[0031] As shown in the embodiment of FIG6, a third region 213 may be further included between the first region 211 and the second region 212. The brightness gain effect of the gain diaphragm assembly 800 in the vertical projection range of the third region 213 is better than the brightness gain effect in the vertical projection range of the second region 212, but less than the brightness gain effect in the vertical projection range of the first region 211. In other words, the change in brightness gain effect is achieved gradually across regions. Accordingly, visually obvious boundaries caused by the difference in brightness gain effects between the first region 211 and the second region 212 can be reduced. In different embodiments, the brightness gain effect in the vertical projection range of the third region 213 can be gradually reduced from the first region 211 to the second region 212, making the gradual change in brightness gain effect more pronounced.

[0032] As shown in the different embodiments in FIG7, the gain film assembly 800' of the present invention includes a first gain film 100, a second gain film 200, and an interface layer 300. The first gain film 100 includes a first surface 110, on which a plurality of first gain structures 120 distributed along a first direction 610 are disposed. The second gain film 200 is stacked on one side of the first gain film 100 and includes a second surface 210 facing the same direction as the first surface 110. The second surface 210 is provided with a plurality of second gain structures 220 distributed along a second direction 620 orthogonal to the first direction 610. The interface layer 300 is disposed between the first gain film 100 and the second gain film 200 and includes a fourth region 340 closer to the center and a fifth region 350 closer to the periphery. By using different materials or adding particles, the light transmittance of the fourth region 340 is higher than that of the fifth region 350. Preferably, the interface layer 300 is an adhesive layer that allows the first gain sheet 100 and the second gain sheet 200 to be adhered and fixed. The brightness gain effect of the gain film assembly 800' in the vertical projection range of the fourth region 340 is greater than the brightness gain effect in the vertical projection range of the fifth region 350.

[0033] More specifically, in this embodiment, since the transmittance of the fourth region 340 is higher than that of the fifth region 350, more light passes through the fourth region 340 than through the fifth region 350. The amount of light in the vertical projection range of the fifth region 350 is substantially reduced, thereby achieving the effect of reducing the brightness of the peripheral area of ​​the gain diaphragm group 800', thus improving the problem of excessive brightness in the peripheral area in the prior art.

[0034] As shown in the embodiment of FIG8, a sixth region 360 may be further included between the fourth region 340 and the fifth region 350. The brightness gain effect of the gain diaphragm group 800' in the vertical projection range of the sixth region 360 is better than the brightness gain effect in the vertical projection range of the fifth region 350, but less than the brightness gain effect in the vertical projection range of the fourth region 340. In other words, the change in brightness gain effect is achieved in a progressive manner. Accordingly, the visually obvious boundary caused by the difference in light transmittance between the fourth region 340 and the fifth region 350 can be reduced. In different embodiments, the brightness gain effect in the vertical projection range of the sixth region 360 can be gradually reduced from the fourth region 340 to the fifth region 350, making the progressive effect of the brightness gain effect more obvious.

[0035] The present invention has been described by the above-described related embodiments; however, the above embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and equivalents that fall within the spirit and scope of the claims are included within the scope of the present invention. [Simplified Explanation of the Diagram]

[0036] Figure 1 is a schematic diagram of an embodiment of the light-emitting device of the present invention.

[0037] Figure 2A is a schematic diagram of an embodiment of the gain diaphragm assembly of the present invention.

[0038] Figure 2B is a schematic diagram of an embodiment in which the second gain plate in the gain diaphragm group of the present invention is formed by splicing diaphragms.

[0039] Figure 3 is a schematic diagram of an embodiment in which the positions of the first diaphragm and the second gain plate are interchanged in the gain diaphragm group of the present invention.

[0040] Figure 4 is a schematic diagram of different embodiments of the gain diaphragm assembly of the present invention.

[0041] Figure 5A is a schematic diagram of an embodiment of the height reduction of the third gain structure in the gain diaphragm group of the present invention.

[0042] Figure 5B is a schematic diagram of an embodiment of the filling material between the third gain structures in the gain diaphragm group of the present invention.

[0043] Figure 6 is a schematic diagram of an embodiment in which a third region is included between the first region and the second region in the gain diaphragm group of the present invention.

[0044] Figure 7 is a schematic diagram of different embodiments of the gain diaphragm assembly of the present invention including an interface layer.

[0045] Figure 8 is a schematic diagram of an embodiment in which the sixth region is included between the fourth and fifth regions of the gain diaphragm group of the present invention.

Claims

1. A gain diaphragm assembly, comprising: a first gain sheet including a plurality of first gain structures respectively distributed along a first direction; and a second gain sheet, stacked on one side of the first gain sheet, including a first region closer to the center and a second region closer to the periphery, the first region being provided with a plurality of second gain structures respectively distributed along a second direction intersecting the first direction, and the second region being provided with a plurality of third gain structures distributed along a third direction; wherein, The brightness gain effect of the gain diaphragm group in the vertical projection range of the first region is greater than that in the vertical projection range of the second region.

2. The gain diaphragm assembly as claimed in claim 1, wherein the first direction is orthogonal to the second direction.

3. The gain diaphragm assembly as claimed in claim 1, wherein the first gain diaphragm includes a first surface on which the plurality of first gain structures are disposed, and the second gain diaphragm includes a second surface facing in the same direction as the first surface, the second surface including the first region and the second region.

4. The gain diaphragm assembly as claimed in claim 1, wherein the first region and the second region further include a third region, wherein the brightness gain effect of the gain diaphragm assembly in the vertical projection range of the third region is better than the brightness gain effect in the vertical projection range of the second region and less than the brightness gain effect in the vertical projection range of the first region.

5. The gain diaphragm assembly as claimed in claim 1, wherein the angle between the first direction and the second direction is closer to 90 degrees than the angle between the first direction and the third direction.

6. The gain diaphragm assembly as claimed in claim 5, wherein the second gain diaphragm comprises a first sub-diaphragm and a second sub-diaphragm spliced ​​together, the first sub-diaphragm and the second sub-diaphragm respectively having the first region and the second region.

7. The gain diaphragm assembly as claimed in claim 1, wherein the second direction is different from the third direction.

8. The gain diaphragm assembly as claimed in claim 1, wherein the third direction is orthogonal to the first direction.

9. The gain diaphragm assembly as claimed in claim 1, wherein the refractive index of the first region is greater than the refractive index of the second region.

10. The gain diaphragm assembly as claimed in claim 1, wherein the cross-sections of the plurality of second gain structures perpendicular to the first direction are closer to a plurality of continuously distributed complete triangles than the cross-sections of the plurality of third gain structures perpendicular to the first direction.

11. A gain film assembly, comprising: a first gain film including a plurality of first gain structures respectively distributed along a first direction; a second gain film stacked on one side of the first gain film, including a plurality of second gain structures respectively distributed along a second direction intersecting the first direction; an interface layer disposed between the first gain film and the second gain film, including a fourth region closer to the center and a fifth region closer to the periphery, wherein the transmittance of the fourth region is higher than that of the fifth region; wherein, The brightness gain effect of the gain diaphragm group in the vertical projection range of the fourth region is greater than that in the vertical projection range of the fifth region.

12. The gain diaphragm assembly as claimed in claim 11, further comprising a sixth region between the fourth and fifth regions, wherein the luminance gain effect of the gain diaphragm assembly in the vertical projection range of the sixth region is better than the luminance gain effect in the vertical projection range of the fifth region and less than the luminance gain effect in the vertical projection range of the fourth region.

13. A light-emitting device comprising: a light source; and a gain diaphragm assembly as described in any one of claims 1 to 12, disposed on one side of the light source.

14. The light-emitting device as claimed in claim 13, wherein at least one of the first gain sheet opposite the first surface and the second gain sheet opposite the second surface is further stacked with a haze film.

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