Light guide plate and multi-partition side-entry backlight module
By designing a light guide plate with optical partitioning function and uniform light output function, the problems of large size, high cost and difficult partition control in the existing backlight module structure are solved, and high-quality image display and cost reduction are achieved.
Patent Information
- Application Number
- CN202422001023.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-19
AI Technical Summary
The existing direct-down backlight module structure uses multiple LED lamp beads, resulting in increased module volume, increased production cost and assembly difficulty, and it is difficult to achieve efficient partition control and uniform light output functions.
A light guide plate is designed, and the substrate part made of light-transmitting material includes a plurality of spaced-arranged substrates. Each substrate is equipped with a light-input surface, a reflection surface and a light-out surface. The reflection surface is arranged opposite to the light-out surface, and a mirror or a double-convex lens surface is provided on the light-out surface. An optical microstructure is provided on the reflection surface to disperse light and achieve uniform light-out.
Through the optical partitioning function and uniform light output function of the light guide plate, the prominent partition control timing scanning backlight function of the side-in backlight module is realized, which improves image display quality and reduces production costs.
Smart Images
Figure CN223051532U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optoelectronic display, in particular to a light guide plate and a multi-zone side-in type backlight module. Background Art
[0002] Among the existing backlights with the Local Dimming function (local backlight adjustment function) on the market, most adopt the structure of a direct-lit backlight module. Although it can achieve zonal control of the output light and reduce the backlight power consumption, it uses a very large number of LED beads, thereby expanding the overall volume of the backlight module, increasing the production cost of the product, and increasing the difficulty and complexity of the assembly operation, which is not conducive to the production implementation of the product.
[0003] In view of this, the present utility model is specifically proposed. Summary of the Invention
[0004] In order to overcome the above defects, the utility model provides a light guide plate and a multi-zone side-in type backlight module. On the one hand, the light guide plate has a significant optical zoning function and an excellent light homogenization function, and can enable the side-in type backlight module to have an outstanding zonal control sequential scanning backlight function, with good image display quality; on the other hand, the structure of the light guide plate is simple and easy to arrange and install, achieving the effect of reducing costs.
[0005] The technical solution adopted by the utility model to solve its technical problems is: a light guide plate, including a substrate part made of a light-transmitting material, the substrate part includes a plurality of base plates arranged at intervals, each base plate is provided with a light incident surface for receiving the light emitted by the light source, and a reflection surface and a light exit surface respectively adjacent to the light incident surface, the reflection surface and the light exit surface are arranged back to back;
[0006] In each base plate, the light exit surface is a mirror surface or a double convex lens surface, and an optical microstructure is provided on the reflection surface to disperse the light so that the light is evenly emitted from the light exit surface.
[0007] As a further improvement of the utility model, the plurality of base plates are arranged in parallel in sequence.
[0008] As a further improvement of the utility model, the surface roughness Ra of the opposite two surfaces of two adjacent base plates is ≤ 0.5 μm.
[0009] As a further improvement of the utility model, at least one of the opposite two surfaces of two adjacent base plates is convexly provided with a spacer for restricting the gap between the two adjacent base plates.
[0010] As a further improvement of the utility model, the spacer is any one of a sphere, a hemisphere, a cylinder and a semi-cylinder.
[0011] As a further improvement of the present utility model, the separator is integrally formed with the base plate, or the separator is adhesively fixed to the base plate.
[0012] As a further improvement of the present utility model, the juxtaposition direction of a plurality of the base plates is defined as the first direction; on at least one surface of each of the base plates along the first direction, a plurality of the separators are provided, and the plurality of separators are also arranged at intervals and juxtaposed in a second direction perpendicular to the first direction.
[0013] As a further improvement of the present utility model, the gap between two adjacent base plates is not greater than 0.3 mm.
[0014] As a further improvement of the present utility model, the juxtaposition direction of a plurality of the base plates is defined as the first direction. Correspondingly, at least one surface of each of the base plates along the second direction is the light incident surface, and two surfaces of each of the base plates along the third direction are the reflection surface and the light exit surface respectively, wherein the first direction, the second direction and the third direction are perpendicular to each other.
[0015] The present utility model also provides a multi-zone side-entry backlight module, which includes a light guide plate, a prism sheet, a diffusion film, a reflective film, a back frame and a light source unit as described in the present utility model. Among them, the prism sheet, the diffusion film, the light guide plate and the reflective film are sequentially stacked and are jointly supported and installed by the back frame; the light source unit is provided with a plurality of LED lamp beads, and the plurality of LED lamp beads are all built in the back frame and are respectively arranged beside the light incident surfaces of a plurality of the base plates.
[0016] The beneficial effects of the present utility model are as follows: 1) Through structural innovation, the light guide plate of the present utility model has a significant optical zoning function and an excellent light-emitting uniformity function, so that the side-entry backlight module can have an outstanding zoning control sequential scanning backlight function, and the image display quality is good. 2) The structure of the light guide plate of the present utility model is simple and easy to arrange and install, achieving the effect of cost reduction. Description of the Drawings
[0017] Figure 1 It is a schematic structural diagram of the light guide plate according to Embodiment 1 of the present utility model;
[0018] Figure 2 is Figure 1 a partial cross-sectional structural diagram of the shown light guide plate;
[0019] Figure 3 is Figure 1 a schematic structural diagram of one of the separators on the shown light guide plate;
[0020] Figure 4 For Figure 1 Figure 2 showing the structure of the spacer on the light guide plate;
[0021] Figure 5 Figure showing the structure of the multi - zone side - entry backlight module according to Embodiment 2 of the present utility model;
[0022] Figure 6 For Figure 5 Partial structure diagram of the multi - zone side - entry backlight module shown;
[0023] Figure 7 For Figure 6 Enlarged structure diagram of part A shown;
[0024] Figure 8 For Figure 6 Partial cross - sectional structure diagram of the multi - zone side - entry backlight module shown.
[0025] The following description is made in conjunction with the accompanying drawings:
[0026] 1. Light guide plate; 10. Base plate; 100. Light incident surface; 101. Reflective surface;
[0027] 102. Light exit surface; 11. Optical microstructure; 12. Spacer; 2. Prismatic sheet; 3. Diffusion film; 4. Reflective film; 5. Back frame; 6. LED lamp beads. Specific embodiments
[0028] The following describes the preferred embodiments of the present utility model in detail in conjunction with the accompanying drawings.
[0029] Embodiment 1:
[0030] Embodiment 1 of the present invention provides a light guide plate, by which a partition - controlled sequential scanning backlight application with significant contrast can be realized, improving the image display quality.
[0031] Please refer to the attached Figure 1 to the attached Figure 4As shown in the figure, the light guide plate described in Embodiment 1 includes a substrate portion made of a light-transmitting material. In particular, the substrate portion includes a plurality of base plates 10 arranged at intervals. Each base plate 10 is provided with a light incident surface 100 for receiving light emitted by a light source, and a reflecting surface 101 and a light-emitting surface 102 respectively adjacent to the light incident surface 100, and the reflecting surface 101 and the light-emitting surface 102 are arranged back to back. It can be understood that by assembling a plurality of independent base plates 10 into the substrate portion, an air layer is introduced into the substrate portion, so that the light guide plate can have obvious optical zoning, and further, the side-entry backlight module and its application products can have an outstanding zoning control sequential scanning backlight function. In addition, in each base plate 10, the light-emitting surface 102 is a mirror surface or a double convex lens surface, and an optical microstructure 11 is provided on the reflecting surface 101. By means of the optical microstructure 11, light can be dispersed to achieve the effect of blurring / uniformizing the light, so that the light can be evenly emitted from the light-emitting surface 102, thereby optimizing the optical effects of the light guide plate and its application products (such as side-entry backlight modules, etc.).
[0032] The specific structure of the light guide plate described in Embodiment 1 will be described in detail below.
[0033] First, regarding the substrate portion.
[0034] In Embodiment 1, the substrate portion is entirely made of a light-transmitting material, that is: a plurality of the base plates 10 in the substrate portion are all made of a light-transmitting material. Regarding the light-transmitting material, any one of materials such as PC (polycarbonate), PMMA (polymethyl methacrylate), COP (cycloolefin polymer), and PET (polyethylene terephthalate) can be preferably used. Of course, the present application is not limited to the above types of light-transmitting materials, and other types of light-transmitting materials can also be selected in actual production.
[0035] In Embodiment 1, according to the product design requirements, a plurality of the base plates 10 in the substrate portion are arranged in parallel in sequence, and further, a plurality of the base plates 10 are preferably designed to be arranged in parallel at equal intervals, as can be seen in the attached Figure 1 figure. Of course, the present application is not limited to this. In other embodiments, a plurality of the base plates 10 can also be selected to be arranged in parallel at unequal intervals. In addition, regarding the gap between two adjacent base plates 10, Embodiment 1 is preferably designed such that the gap between every two adjacent base plates 10 is not greater than 0.3 mm. Of course, the present application is not limited to this either, and it can be determined specifically according to the product design requirements.
[0036] Based on the juxtaposed arrangement of the multiple base plates 10 described above, in Embodiment 1, the opposite surfaces of every two adjacent base plates 10 (which can also be referred to as the "cutting surfaces" of the substrate portion) are particularly optimized as follows: the roughness Ra of the opposite surfaces of every two adjacent base plates 10 is preferably controlled to Ra ≤ 0.5 μm; that is, in Embodiment 1, the opposite surfaces of every two adjacent base plates 10 are preferably designed to be mirror surfaces. It can be understood that whether light can pass through a medium depends on whether its exit angle exceeds the critical angle of the medium. In Embodiment 1, by mirroring the "cutting surfaces" of the substrate portion, the number of light rays exceeding the critical angle of the medium is greatly reduced, so that the light rays entering the base plate 10 can be effectively prevented from exiting to the outside from the "cutting surface", that is, the light leakage phenomenon at the "cutting surface" can be avoided, thereby avoiding the obvious visual perception of the division position of the substrate portion, that is, avoiding the obvious visual perception of the gap between every two adjacent base plates 10, and further optimizing and improving the image display quality.
[0037] Next, regarding the spacer 12.
[0038] Based on the juxtaposed arrangement of the multiple base plates 10 described above, and in order to quickly and conveniently arrange the multiple base plates 10, and to ensure that the gap between every two adjacent base plates 10 meets the design requirements of the product, in Embodiment 1, the following optimization improvements are also made to the structure of the base plate 10: on at least one of the opposite surfaces of every two adjacent base plates 10, a spacer 12 is convexly provided for restricting the gap between the two adjacent base plates 10. That is, in Embodiment 1, by providing the spacer 12 on the "cutting surface" of the substrate portion, the gap between every two adjacent base plates 10 can be constrained and restricted, so as to realize the quick and accurate arrangement and installation of the base plates 10.
[0039] Furthermore, according to the design requirements of the product, in Embodiment 1, the spacer 12 can be provided on any one of the opposite surfaces of every two adjacent base plates 10, or the spacer 12 can also be provided on both of the opposite surfaces of every two adjacent base plates 10. It should be noted that when in Embodiment 1, the spacer 12 is provided on both of the opposite surfaces of every two adjacent base plates 10, the spacers 12 located on the two base plates 10 are preferably designed to be arranged in a staggered manner to avoid the arrangement state of the multiple base plates 10 not meeting the design requirements of the product due to the interference between the spacers 12.
[0040] Specifically, in the appendix Figure 1Taking the arrangement of the multiple base plates 10 shown as an example for illustration, if the juxtaposition direction of the multiple base plates 10 is defined as the first direction D1, correspondingly, at least one surface of each base plate 10 along the second direction D2 perpendicular to the first direction D1 is the light incident surface 100, and, two surfaces of each base plate 10 along the third direction D3 perpendicular to the first direction D1 and the second direction D2 respectively are the reflection surface 101 and the light exit surface 102; further taking the Figure 1 base plate 10 shown as a long strip as an example (Note: in actual production, the shapes of the multiple base plates 10 in the substrate part may be the same or different, but for the convenience of illustration, the following takes the shapes of the multiple base plates 10 as the same for illustration), the first direction D1 is parallel to the width direction of the base plate 10, the second direction D2 is parallel to the length direction of the base plate 10, and the third direction D3 is parallel to the vertical direction.
[0041] Based on the above structural description of the base plate 10, in the first embodiment, a plurality of the spacers 12 are provided on at least one surface of each base plate 10 along the first direction D1, that is, a plurality of the spacers 12 are provided on one or two surfaces in the width direction of each base plate 10; and further, a plurality of the spacers 12 located on the same surface of the base plate 10 are also arranged at intervals and juxtaposed along the second direction D2 (the length direction of the base plate 10). Of course, regarding the configuration quantity of the spacers 12, the distance between two adjacent spacers 12, etc., the present application does not make restrictive requirements, and can be specifically determined according to the product design requirements.
[0042] Further, according to the product design requirements, the shape of the spacer 12 is preferably designed as any one of a sphere, a hemisphere, a cylinder, and a semi-cylinder, among which Figure 3 the case where the spacer 12 is a hemisphere is shown, Figure 4 the case where the spacer 12 is a semi-cylinder is shown. However, it can be understood that the present application is not limited to the above shapes, and can be specifically determined according to the actual production requirements.
[0043] Further, regarding the manner in which the spacer 12 is formed on the base plate 10, in the first embodiment, it is preferably adopted that: the spacer 12 can be integrally formed with the base plate 10 by an injection molding process, or the spacer 12 can also be fixedly bonded to the base plate 10 by an adhesive. Of course, the present application is not limited to the above forming methods, and can be specifically determined according to the actual production requirements.
[0044] Then, regarding the optical microstructure 11.
[0045] According to the product design requirements, the optical microstructure 11 of this embodiment 1 may preferably adopt a convex sphere, a convex quadrangular pyramid, a concave conical trough, or a concave quadrangular pyramid trough, etc., which are conventional technical means in the field of light guide plate technology, so they are not described in detail here. In addition, in this embodiment 1, the optical microstructure 11 arranged on the reflective surface 101 of each substrate block 10 is configured as a plurality of them and arranged in an array. It should also be noted that by appropriately selecting the height change and arrangement change of the optical microstructure 11, the diffusion degree shown by the optical microstructure 11 can be adjusted according to different product requirements. This is a conventional technical means well known to those skilled in the art, so it is not described in detail here.
[0046] In summary, on the one hand, the light guide plate described in this embodiment 1 has significant optical partitioning function and excellent uniform light output function, which can enable the edge-entry backlight module to have outstanding partition control timing scanning backlight function and good image display quality; on the other hand, the light guide plate described in this embodiment 1 has a simple structure and is easy to arrange and install, thereby achieving the effect of reducing production costs.
[0047] Embodiment 2:
[0048] Please refer to the attached Figure 5 To Attachment Figure 8 As shown, this embodiment 2 provides a multi-partition side-entry backlight module, which includes a light guide plate 1, a prism sheet 2, a diffusion film 3, a reflective film 4, a back frame 5 and a light source unit, wherein the light guide plate 1 adopts the light guide plate structure provided in the above embodiment 1, and the prism sheet 2, the diffusion film 3, the light guide plate 1 and the reflective film 4 are stacked in sequence and supported and installed together by the back frame 5; the light source unit is provided with a plurality of LED lamp beads 6, and the plurality of LED lamp beads 6 are all built into the back frame 5, and are also respectively and correspondingly arranged beside the light incident surfaces 100 of the plurality of substrate blocks 10. It can be understood that based on the optical partitioning and uniform light output functions of the light guide plate 1, the backlight module described in this embodiment 2 can have an outstanding partition control sequential scanning backlight function, and the image display quality is good.
[0049] Furthermore, the light source unit described in the second embodiment is also provided with an LED driver to control the plurality of LED lamp beads 6 to light up and turn off respectively according to the areas corresponding to the optical partitions, thereby realizing the application of scanning technology on the backlight module.
[0050] Further, the prism sheet 2, the diffusion film 3, and the reflective film 4 described in this Embodiment 2 are all conventional configurations in the backlight module. Among them, the prism sheet 2 and the diffusion film 3 can cooperate to make the emitted light uniform and improve the brightness of the light; the reflective film 4 is used to return the light leaking outside the reflective surface 101 of the light guide plate 1 back into the light guide plate 1 to improve the light utilization efficiency. In addition, this Embodiment 2 does not limit the quantity and type of the prism sheet 2, the diffusion film 3, and the reflective film 4, which are specifically determined according to the product design requirements. In addition, in addition to the above structure, other optical elements may be configured in the backlight module described in this Embodiment 2, such as a DBEF optical brightness enhancement film, etc., which also belong to the conventional technical means in the backlight module, so details are not described herein.
[0051] Many specific details have been set forth in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. All simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the protection of the technical solution of the present invention.
Claims
1. A light guide plate, comprising a substrate portion made of a light-transmitting material, characterized in that: The substrate portion comprises a plurality of substrate blocks (10) arranged at intervals, each of the substrate blocks (10) being provided with a light incident surface (100) for receiving light emitted by a light source, and a reflection surface (101) and a light emitting surface (102) respectively adjacent to the light incident surface (100), the reflection surface (101) and the light emitting surface (102) being arranged in back-to-back relationship; In each of the substrate blocks (10), the light emitting surface (102) is a mirror surface or a biconvex lens surface, and an optical microstructure (11) is provided on the reflective surface (101) to disperse light so that the light is emitted evenly from the light emitting surface (102).
2. The light guide plate according to claim 1, characterized in that: The plurality of substrate blocks (10) are arranged in parallel in sequence.
3. The light guide plate according to claim 2, characterized in that: The roughness Ra of the two opposite surfaces of two adjacent substrate blocks (10) is ≤ 0.5 μm.
4. The light guide plate according to claim 2, characterized in that: An isolating member (12) for limiting the gap between the two adjacent substrate blocks (10) is convexly provided on at least one of the two opposite surfaces of the two adjacent substrate blocks (10).
5. The light guide plate according to claim 4, characterized in that: The isolating member (12) is any one of a sphere, a hemisphere, a cylinder and a semi-cylinder.
6. The light guide plate according to claim 4, characterized in that: The isolating member (12) is integrally formed with the substrate block (10), or the isolating member (12) is adhesively fixed to the substrate block (10).
7. The light guide plate according to claim 4, characterized in that: The parallel direction of the plurality of substrate blocks (10) is defined as a first direction; A plurality of the isolation members (12) are provided on at least one side of each substrate block (10) along the first direction, and the plurality of the isolation members (12) are also spaced and arranged in parallel along a second direction perpendicular to the first direction.
8. The light guide plate according to claim 4, characterized in that: The gap between two adjacent substrate blocks (10) is no greater than 0.3 mm.
9. The light guide plate according to claim 2, characterized in that: The parallel direction of the plurality of substrate blocks (10) is defined as a first direction, and correspondingly, at least one side of each substrate block (10) along the second direction is the light incident surface (100), and the two sides of each substrate block (10) along the third direction are respectively the reflection surface (101) and the light emitting surface (102), wherein the first direction, the second direction and the third direction are perpendicular to each other.
10. A multi-zone edge-type backlight module, characterized in that: The method comprises a light guide plate (1), a prism sheet (2), a diffusion film (3), a reflective film (4), a back frame (5) and a light source unit according to any one of claims 1 to 9, wherein: The prism sheet (2), the diffusion film (3), the light guide plate (1) and the reflective film (4) are stacked in sequence and supported and installed together through the back frame (5); the light source unit is provided with a plurality of LED lamp beads (6), and the plurality of LED lamp beads (6) are all built into the back frame (5) and are also respectively and correspondingly arranged beside the light incident surfaces (100) of the plurality of substrate blocks (10).