Diffusion plate, backlight module and display equipment
By setting intersecting first and second foam layers in the foamed diffuser plate, and combining UV adhesive and base layer structure, the problem of uneven light output of existing foamed diffuser plates is solved, achieving better diffusion effect and visual uniformity of display devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUIZHOU VISION NEW TECH CO LTD
- Filing Date
- 2025-04-28
- Publication Date
- 2026-05-12
AI Technical Summary
The bubbles in existing foamed diffuser plates extend in the same direction, resulting in poor diffusion of light when it is refracted in the foam layer, uneven light output, and affecting the display effect of display devices.
A diffuser plate is designed, which uses first and second foam layers that intersect in the thickness direction. The projections of the bubble length direction on the light-incident side are intersecting and fixed with UV adhesive. Combined with the base layer and rib structure, the diffuser plate improves the uniformity of light diffusion.
It effectively improves the diffusion effect and light uniformity of the diffuser plate, enhances the visual uniformity of Mini LED display devices, and improves the user experience.
Smart Images
Figure CN224232073U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of display device technology, specifically to a diffuser plate, a backlight module, and a display device. Background Technology
[0002] Currently, most foamed diffuser panels on the market are composed of a three-layer structure consisting of two base layers sandwiching a foam layer. The bubbles in the foam layer extend in the same direction. Therefore, when light is refracted in the foam layer, the diffusion effect is poor, and the uniformity of light emitted from the diffuser panel is poor. Utility Model Content
[0003] This application provides a diffuser plate, a backlight module, and a display device, aiming to improve the uniformity of diffusion in existing foamed diffuser plates.
[0004] On one hand, embodiments of this application provide a diffuser plate having an incident light side and an exit light side disposed opposite to each other in its thickness direction, and a first foaming layer and a second foaming layer stacked along its thickness direction;
[0005] The projections of the length directions of the bubbles in the first foaming layer and the second foaming layer onto the light-incident side of the diffuser plate are intersecting.
[0006] In some embodiments, the angle between the projections of the length directions of the bubbles in the first foaming layer and the length directions of the bubbles in the second foaming layer onto the light-incident side of the diffuser plate is α, where 60°≤α≤120°.
[0007] In some embodiments, 86° ≤ a ≤ 94°; and / or,
[0008] The thickness of the first foam layer is equal to the thickness of the second foam layer.
[0009] In some embodiments, an adhesive layer is provided between the first foam layer and the second foam layer.
[0010] In some embodiments, the adhesive layer is composed of UV adhesive.
[0011] In some embodiments, the diffuser plate further includes a first base layer and a second base layer. The first base layer is disposed on the side of the first foam layer away from the second foam layer, and the side of the first base layer away from the first foam layer constitutes the light-incident side. The second base layer is disposed on the side of the second foam layer away from the first foam layer, and the side of the second base layer away from the second foam layer constitutes the light-outcrystal side.
[0012] In some embodiments, the light-emitting side and / or light-incident side of the diffuser plate are provided with raised ribs.
[0013] In some embodiments, the ribs located on the light-emitting side are arranged in a triangular shape; and / or,
[0014] The rib located on the light-incident side is arranged in the shape of a quadrangular frustum.
[0015] On the other hand, embodiments of this application provide a backlight module including the diffuser plate as described above.
[0016] In another aspect, embodiments of this application provide a display device including the diffusion plate as described above.
[0017] This embodiment of the application sets up a first foaming layer and a second foaming layer, with the length directions of the bubbles in the first foaming layer and the second foaming layer intersecting on the light-incident side of the diffuser plate. That is, the bubbles in the first foaming layer and the bubbles in the second foaming layer do not extend in the same direction. After light enters from the light-incident side of the diffuser plate, it will pass through the first foaming layer and the second foaming layer in sequence and be refracted by the bubbles in the first foaming layer and the second foaming layer. Since the bubbles in the first foaming layer and the bubbles in the second foaming layer do not extend in the same direction, the diffusion effect of the diffuser plate can be effectively improved, and the uniformity of the light flowing out from the light-emitting side can be better. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a top view of a diffusion plate provided in some embodiments of this application;
[0020] Figure 2 yes Figure 1 Cross-sectional view at point AA;
[0021] Figure 3 yes Figure 2 A magnified view of a section at point C;
[0022] Figure 4 yes Figure 1 Cross-sectional view at point BB;
[0023] Figure 5 yes Figure 1 A schematic diagram of the projection on the incident light side.
[0024] Explanation of key component symbols:
[0025] label name label name 100 Diffuser plate 10 incident light side 20 Light-emitting side 30 First foaming layer 40 Second foaming layer 1 bubble 11 ribs 50 Adhesive layer 60 First grassroots 70 Second grassroots Detailed Implementation
[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0027] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.
[0028] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.
[0029] The use of "applies to" or "configured to" in this application implies open and inclusive language, which does not exclude the applicability to or configuration to devices performing additional tasks or steps. Additionally, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more of the stated conditions or values may in practice be based on additional conditions or values beyond those stated.
[0030] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.
[0031] Currently, most foamed diffuser panels on the market are composed of a three-layer structure consisting of two base layers sandwiching a foam layer. The bubbles in the foam layer extend in the same direction. Therefore, when light is refracted in the foam layer, the diffusion effect is poor, and the uniformity of light emitted from the diffuser panel is poor.
[0032] For this, please refer to Figures 1 to 5 This application provides a diffuser plate 100, which has an incident light side 10 and an exit light side 20 disposed opposite to each other in its thickness direction, and a first foaming layer 30 and a second foaming layer 40 stacked along its thickness direction; wherein the projections of the length directions of the bubbles 1 in the first foaming layer 30 and the length directions of the bubbles 1 in the second foaming layer 40 onto the incident light side 10 of the diffuser plate 100 are intersecting.
[0033] Please refer to this carefully. Figure 5 It should be noted that "intersecting arrangement" refers to two lines on a plane intersecting at an angle, meaning the two lines are neither parallel nor collinear, and there is only one point of intersection. Specifically, when the first foaming layer 30 or the second foaming layer 40 needs to stretch the bubble 1 during the molding process, the length direction of the bubble 1 can refer to the stretching direction of the bubble 1. When both the first foaming layer 30 and the second foaming layer 40 contain multiple bubbles 1, the projections of the length directions of all the bubbles 1 distributed in the two foaming layers can be intersecting, or only some of them can be intersecting; this is not limited here.
[0034] This embodiment of the application sets up a first foaming layer 30 and a second foaming layer 40, and the projections of the two length directions of the bubbles 1 in the first foaming layer 30 and the second foaming layer 40 onto the light-incident side 10 of the diffuser plate 100 intersect. That is, the extension directions of the bubbles 1 in the first foaming layer 30 and the second foaming layer 40 are not the same. After the light enters from the light-incident side 10 of the diffuser plate 100, it will pass through the first foaming layer 30 and the second foaming layer 40 in sequence and be refracted by the bubbles 1 in the first foaming layer 30 and the second foaming layer 40. Since the extension directions of the bubbles 1 in the first foaming layer 30 and the second foaming layer 40 are not the same, the diffusion effect of the diffuser plate 100 can be effectively improved, and the uniformity of the light flowing out from the light-emitting side 20 is better.
[0035] Furthermore, in the technical solution of this application, the angle between the stretching directions of the bubbles 1 in the first foaming layer 30 and the second foaming layer 40 can be set as needed, allowing for more flexible settings according to product requirements. Existing foamed diffusion plates can only improve the diffusion effect of the diffusion plate 100 by adjusting the size of the bubbles 1, the stretching length, the density of the bubbles 1, and the haze of the substrate. In this regard, the foamed diffusion plate 100 provided by this application adds the adjustment of the angle between the bubbles 1 in the first foaming layer 30 and the second foaming layer 40 to further improve the diffusion effect of the foamed diffusion plate 100, thus providing researchers with a new approach when adjusting the diffusion effect of the diffusion plate 100.
[0036] It should be noted that the market share of Mini LED LCD panels with short OD values has been increasing year by year. Due to their exquisite appearance, ultra-thin body, large size, and vibrant color performance, they are very popular among consumers. However, as the OD value becomes smaller and the size becomes larger, it is becoming increasingly difficult to develop and improve the visual uniformity of the display module. In particular, the dispensing solution for Mini LED lamp boards is more challenging because the light pattern is small and sensitive to slight changes in the OD value. The traditional three-layer diffuser plate has poor diffusion uniformity, which can easily affect the overall light uniformity of the backlight module and thus the display effect of the Mini LED LCD panel.
[0037] The use of the diffuser plate 100 provided in this application in Mini LED products can effectively improve the visual uniformity of Mini LED products, thereby enhancing the user experience.
[0038] It should be emphasized that the projections of the two length directions are set to intersect, and the range of their included angle is not limited, as long as it is greater than 0° and less than 180°. For example, it can be 1°, 10°, 20°, etc., and there is no limitation here.
[0039] Please refer to this carefully. Figure 5 In some embodiments, the projection angle between the length directions of the bubbles 1 in the first foaming layer 30 and the length directions of the bubbles 1 in the second foaming layer 40 onto the light-incident side 10 of the diffuser plate 100 is α, where 60°≤α≤120°.
[0040] It is understandable that when the angle between the projections of the two length directions is closer to 0° or closer to 180°, the angle change will be smaller when light is refracted by the bubble 1 of the first foaming layer 30 and then by the bubble 1 of the second foaming layer 40, resulting in poor diffusion uniformity. Conversely, when the angle between the projections of the two length directions is closer to 90°, the angle change will be larger when light is refracted by the bubble 1 of the first foaming layer 30 and then by the bubble 1 of the second foaming layer 40, resulting in better diffusion uniformity.
[0041] Therefore, in the embodiment, by setting the projection angle α of the two length directions on the light-incident side 10 of the diffuser plate 100 to between 60° and 120°, the difference in the extension direction of the bubbles 1 of the first foaming layer 30 and the second foaming layer 40 is sufficiently large, so that the angle change of the light during the second refraction is sufficiently large, thereby improving the uniformity of the light emitted by the diffuser plate 100.
[0042] Furthermore, in some embodiments, 86°≤a≤94° is set in such a way that, since the stretching angle of the first foam layer 30 and the second foam layer 40 of the bubble 1 is approximately perpendicular, the internal refraction and reflection of light after entering the diffuser plate 100 are more complete, resulting in a better light mixing effect. Compared with the current display of the single stretching angle of the bubble 1 of the foam diffuser plate 100, its diffusion effect is better.
[0043] The thicknesses of the first foam layer 30 and the second foam layer 40 can be equal or unequal, and this is not limited here.
[0044] In some embodiments, the thickness of the first foam layer 30 is equal to the thickness of the second foam layer 40. With this configuration, the propagation path length of light within the first foam layer 30 and the second foam layer 40 is approximately equal, which can further improve the uniformity of the emitted light.
[0045] Furthermore, since both layers have the same thickness, in actual production, only the first foam layer 30 can be manufactured, and then a portion of the first foam layer 30 can be rotated at a certain angle to obtain the second foam layer 40, resulting in low production costs.
[0046] Furthermore, since both the first foam layer 30 and the second foam layer 40 are made of foamed material, they are relatively lightweight. When the two are stacked directly, relative movement is likely to occur. In this regard, in one embodiment, an adhesive layer 50 is provided between the first foam layer 30 and the second foam layer 40.
[0047] In the scheme of this embodiment, by setting the adhesive layer 50, the first foam layer 30 and the second foam layer 40 can be organically fixed together, thereby avoiding relative movement between the two.
[0048] Since the adhesive layer 50 is disposed between the first foam layer 30 and the second foam layer 40, light will also pass through the adhesive layer 50 during propagation. Therefore, in order to avoid the adhesive layer 50 affecting the efficiency of light propagation, in one embodiment, the adhesive layer 50 is made of UV adhesive.
[0049] It should be noted that UV adhesive (Ultraviolet Adhesive) is an adhesive that cures under ultraviolet light. After curing, UV adhesive usually has high transparency, allowing most visible light and infrared light to pass through.
[0050] Therefore, by using UV adhesive to form the adhesive layer 50, most visible light and infrared light can be allowed to pass through. Furthermore, the tiny bubbles 1 that may be generated during the curing process of the UV adhesive can also cause light to refract and reflect, thereby improving the uniformity of the emitted light.
[0051] Specifically, in the actual manufacturing process, the first foam layer 30 and the second foam layer 40 can be manufactured separately, or only the first foam layer 30 can be manufactured, and then a portion of the first foam layer 30 can be rotated by a certain angle to obtain the second foam layer 40. Then, the first foam layer 30 and the second foam layer 40 can be bonded together to complete the manufacturing of the diffuser plate 100.
[0052] Please refer to this carefully. Figure 3 In some embodiments, the diffuser plate 100 further includes a first base layer 60 and a second base layer 70. The first base layer 60 is disposed on the side of the first foam layer 30 away from the second foam layer 40, and the side of the first base layer 60 away from the first foam layer 30 constitutes the light-incident side 10. The second base layer 70 is disposed on the side of the second foam layer 40 away from the first foam layer 30, and the side of the second base layer 70 away from the second foam layer 40 constitutes the light-emitting side 20.
[0053] In the scheme of this embodiment, by setting the first base layer 60 and the second base layer 70, during the manufacturing process, the foaming material can be directly foamed on the first base layer 60 and the second base layer 70, and then the bubbles 1 of the foamed layer are stretched to obtain the first foamed layer 30 and the second foamed layer 40. Then the first foamed layer 30 and the second foamed layer 40 are bonded together to complete the manufacturing of the diffuser plate 100. The manufacturing process is simple.
[0054] In order to improve the shielding performance of the light-emitting side 20 and / or the light-incident side 10 of the diffuser plate 100, in some embodiments, the light-emitting side 20 and / or the light-incident side 10 of the diffuser plate 100 are provided with ribs 11. Correspondingly, in the scheme of this embodiment, by providing ribs 11 on the light-emitting side 20 and / or the light-incident side 10 of the diffuser plate 100, the ribs 11 improve the shielding performance of the light-emitting side 20 and / or the light-incident side 10.
[0055] Specifically, the rib 11 located on the light-emitting side 20 is arranged in the shape of a triangular strip. The cross-section of the triangular strip is triangular, which can also be understood as a V-structure. The V-structure design can be 90 degrees or 0 degrees. In addition to improving the shielding of the diffuser plate 100, the main purpose of this structure is to utilize the light-gathering principle of the prism lens to improve the brightness of the diffuser plate 100, so as to increase the brightness or maintain the brightness without reducing the shielding.
[0056] In addition, the convex rib 11 located on the light-incident side 10 is arranged in the shape of a quadrangular frustum. The cross-section of the quadrangular frustum is trapezoidal. The light-incident side 10 adopts a trapezoidal pyramid structure design. This design mainly takes into account the fact that it is not easy to cause scratches while meeting the requirements of improving the uniformity of light mixing and improving the shielding of the diffuser plate 100.
[0057] This utility model also proposes a backlight module, which includes a diffuser plate 100. The specific structure of the diffuser plate 100 is as described in the above embodiments. Since this backlight module adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0058] This utility model also proposes a display device, which includes a diffuser plate 100. The specific structure of the diffuser plate 100 is as described in the above embodiments. Since this display device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0059] Specifically, the display device includes a Mini LED display device that uses the diffuser plate 100 provided in this application. Applying it to Mini LED products can effectively improve the visual uniformity of Mini LED products, thereby enhancing the user experience.
[0060] The diffuser plate, backlight module, and display device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A diffusion plate, characterized in that, The diffuser plate has an incident light side and an exit light side disposed opposite to each other in its thickness direction, and a first foaming layer and a second foaming layer stacked along its thickness direction. The projections of the length directions of the bubbles in the first foaming layer and the second foaming layer onto the light-incident side of the diffuser plate are intersecting.
2. The diffuser plate according to claim 1, characterized in that, The angle between the projections of the length directions of the bubbles in the first foaming layer and the length directions of the bubbles in the second foaming layer onto the light-incident side of the diffuser plate is α, where 60°≤α≤120°.
3. The diffuser plate according to claim 2, characterized in that, 86°≤a≤94°; and / or, The thickness of the first foam layer is equal to the thickness of the second foam layer.
4. The diffuser plate according to claim 1, characterized in that, An adhesive layer is provided between the first foam layer and the second foam layer.
5. The diffuser plate according to claim 4, characterized in that, The adhesive layer is made of UV adhesive.
6. The diffusion plate according to any one of claims 1 to 5, characterized in that, The diffuser plate further includes a first base layer and a second base layer. The first base layer is disposed on the side of the first foam layer away from the second foam layer, and the side of the first base layer away from the first foam layer constitutes the light-incident side. The second base layer is disposed on the side of the second foam layer away from the first foam layer, and the side of the second base layer away from the second foam layer constitutes the light-outcrystal side.
7. The diffusion plate according to any one of claims 1 to 5, characterized in that, The diffuser plate is provided with raised ribs on the light-emitting side and / or light-incident side.
8. The diffuser plate according to claim 7, characterized in that, The ribs located on the light-emitting side are arranged in a triangular shape; and / or, The rib located on the light-incident side is arranged in the shape of a quadrangular frustum.
9. A backlight module, characterized in that, Includes the diffusion plate as described in any one of claims 1 to 8.
10. A display device, characterized in that, Includes the diffusion plate as described in any one of claims 1 to 8.