Reflective cup, direct backlight module and display device
Patent Information
- Application Number
- CN202522039547.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-23
- Publication Date
- 2026-10-20
- Estimated Expiration
- 2035-09-23
AI Technical Summary
[0003]然而，直下式背光模组在实际使用时容易出现四个直角部偏暗的缺陷，具体见附图1中黑色圆圈圈住的部分所示
[0015]本实用新型的有益效果是：1）本实用新型通过对反射杯结构进行改进，即在位于所述反射杯四角位置处的所述角落腔单元上设有倒角结构，以增加光线在所述角落腔单元的所述反射杯单腔中的反射次数，使得光线更加充分地被利用，从而使得所述反射杯角落位置处变亮，很好的满足了区域扫描均一性要求及大大提升了光学效果。2）本实用新型所述反射杯的结构简单、新颖、合理，易加工制作、且制作成本低，利于产品加工生产实施。3）借由本实用新型提供的反射杯的功能优点，可使应用有所述反射杯的直下式背光模组及显示装置等产品的光学效果佳，很好的满足了市场需求。
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Figure CN224873813U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of optoelectronic display technology, and in particular to a reflective cup, a direct-lit backlight module, and a display device. Background Technology
[0002] As is well known, a direct-lit backlight module refers to a type of backlight module in which LED beads are placed below a diffuser plate. It has advantages such as high contrast, high dynamic range imaging support (HDR support), and strong light control capabilities.
[0003] However, direct-lit backlight modules are prone to a darker appearance at the four right corners during actual use, as detailed in the appendix. Figure 1 The area circled in black is shown in the image. The main reason for this is that the light emitted by the LED beads cannot reach the corner areas of the backlight module due to the structural limitations of the direct-lit backlight module, resulting in darker corner areas. To meet the requirement of uniform area scanning, the current value of the LED beads in the corner areas is generally compensated to solve this problem.
[0004] However, if the scattering and reflection of light can be optimized by modifying local materials and / or improving local structures, more efficient and superior optical effects will be provided. Therefore, this invention is proposed. Summary of the Invention
[0005] To overcome the above-mentioned defects, this utility model provides a reflector cup, a direct-lit backlight module, and a display device. The reflector cup has the characteristics of simple, novel, and reasonable structure, and uniform brightness distribution, which can greatly improve the optical effect of the direct-lit backlight module and the display device, and well meet the market demand.
[0006] The technical solution adopted by this utility model to solve its technical problem is: a reflector cup, including a substrate and a plurality of reflector cup cavities disposed on the substrate, each of the reflector cup cavities having a bottom opening, a reflective side surface surrounding and connected to the periphery of the bottom opening, and a top opening disposed on the side of the reflective side surface facing away from the bottom opening; a corner cavity unit consisting of four reflector cup cavities arranged in a 2×2 array is provided at a corner position of the substrate, and each of the four corner positions of the corner cavity unit has a chamfered structure for increasing the number of reflections of light in the reflector cup cavities.
[0007] As a further improvement of this utility model, in the corner cavity unit, the bottom openings of the four reflective cup single cavities are provided with R-arc edges, and at least one reflective cup single cavity is provided with a reflective arc surface on its reflective side surface.
[0008] As a further improvement of this utility model, the corner cavity unit has diagonal A and diagonal B; In the corner cavity unit, the R-arc edges on the two single cavities of the reflector cup are both located on the diagonal A and are arranged in a mirror symmetry with respect to the center of the diagonal A; the R-arc edges on the remaining two single cavities of the reflector cup are both located on the diagonal B and are arranged in a mirror symmetry with respect to the center of the diagonal B.
[0009] As a further improvement of this utility model, in the corner cavity unit, the bottom openings on the four single cavities of the reflector cups are each composed of two first straight segments connected vertically to form an L shape, two second straight segments connected vertically to the ends of the two first straight segments respectively, and an R-shaped arc edge connecting the two ends of the two second straight segments that are close to each other. Furthermore, the R-shaped arc edges on the four single cavities of the reflector cups all satisfy the relationship: R = L × (38% ~ 55%), where R is the radius of the circle containing the R-shaped arc edge, and L is the length of the first straight segment.
[0010] As a further improvement of this utility model, the substrate is rectangular, and a plurality of the single cavities of the reflective cups are arranged in a rectangular array on the substrate. Correspondingly, corner cavity units are respectively provided at the four corners of the substrate. In each of the four reflective cup cavities of the corner cavity unit, the reflective cup cavity corresponding to the right-angle tip of the substrate has a reflective arc surface on its reflective side surface.
[0011] As a further improvement of this utility model, the reflective arc surface on the same single cavity of the reflective cup is adjacent to the R arc edge, and the reflective arc surface as a whole is a triangular concave arc surface.
[0012] This utility model also provides a direct-lit backlight module, including a reflector cup, a plurality of LED beads, a diffuser plate, and an optical film assembly as described in this utility model. The plurality of LED beads are respectively disposed in a plurality of single cavities of the reflector cup. The diffuser plate is disposed above the reflector cup and is used to uniformly diffuse the light emitted by the LED beads. The optical film assembly is disposed above the light-emitting surface of the diffuser plate and is used to optimize the light emitted from the light-emitting surface of the diffuser plate.
[0013] As a further improvement of this utility model, the optical film assembly includes a lower diffusion film, a middle diffusion film, an upper diffusion film and a DBEF film arranged sequentially from bottom to top.
[0014] This utility model also provides a display device, including the direct-lit backlight module as described in this utility model.
[0015] The beneficial effects of this utility model are: 1) By improving the structure of the reflector cup, specifically by providing chamfered structures on the corner cavity units located at the four corners of the reflector cup, this utility model increases the number of reflections of light within the single cavity of the reflector cup in the corner cavity unit, allowing for more efficient utilization of light and thus brightening the corners of the reflector cup. This effectively meets the requirements for uniformity of area scanning and greatly improves the optical effect. 2) The reflector cup of this utility model has a simple, novel, and reasonable structure, is easy to process and manufacture, and has low manufacturing costs, which is conducive to product processing and production. 3) Utilizing the functional advantages of the reflector cup provided by this utility model, products such as direct-lit backlight modules and display devices using the reflector cup can achieve excellent optical effects, effectively meeting market demands. Attached Figure Description
[0016] Figure 1 A CCD image of a conventional direct-lit backlight module under normal use. Figure 2 This is a three-dimensional structural diagram of the reflective cup described in Embodiment 1 of this utility model; Figure 3 for Figure 2 A schematic diagram of the front view structure of the reflector cup shown in the figure; Figure 4 for Figure 3 An enlarged structural diagram of part A shown in the image; Figure 5 for Figure 4 An enlarged schematic diagram of the bottom opening shown; Figure 6 for Figure 3 An enlarged structural diagram of section B shown in the figure; Figure 7 This is a cross-sectional structural diagram of the direct-lit backlight module described in Embodiment 2 of this utility model; Figure 8 This is a schematic diagram simulating the light rays from the reflector cup; where, Figure 8 Figure A) is a schematic diagram of simulated light rays from a conventional reflector cup; Figure B) is a schematic diagram of simulated light rays from a reflector cup provided in Example 1. Figure 9 Image taken from a CCD sensor in normal operating condition for a direct-lit backlight module; among which... Figure 9 Figure A) shows a CCD measurement image of a corner area of a conventional direct-lit backlight module during normal use; Figure B) shows a CCD measurement image of a corner area of the direct-lit backlight module provided in Example 2 during normal use.
[0017] Referring to the accompanying drawings, the following explanations are provided: 1. Reflector cup; 10. Substrate; 11. Single cavity of reflector cup; 110. Bottom opening; 1101. First straight segment; 1102. Second straight segment; 111. Reflective side; 112. Top opening; 113. R-curved edge; 114. Reflective curved surface; 12. Corner cavity unit; 120. Diagonal A; 121. Diagonal B; 2. LED beads; 3. Diffuser plate; 4. Lower diffuser film; 5. Middle diffuser film; 6. Upper diffuser film; 7. DBEF film. Detailed Implementation
[0018] The preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0019] Example 1:
[0020] In order to overcome the defect of the four right corners being dark in the actual use of the existing direct-lit backlight module, and given that the material of the corner area cannot be precisely different from that of other areas during the processing of the reflector cup, this application makes structural improvements to a local area of the reflector cup (specifically the corner area / or corner region), thereby effectively solving the problem of the corners being dark in the existing direct-lit backlight module while ensuring the integration of the reflector cup.
[0021] Specifically, this application improves the structure of the reflector cup as follows: Please refer to the appendix. Figure 2 To be continued Figure 6 As shown, the reflector cup 1 provided in this application includes a rectangular substrate 10 and a plurality of reflector cup cavities 11 arranged in a rectangular array on the substrate 10. The reflector cup cavities 11 are used to house LED beads, and each reflector cup cavity 11 has a bottom opening 110, a reflective side surface 111 surrounding and connected to the periphery of the bottom opening 110, and a top opening 112 on the side of the reflective side surface 111 facing away from the bottom opening 110. In particular, this application provides corner cavity units 12 at the four corners of the substrate 10, each composed of four reflector cup cavities 11 arranged in a 2×2 array. Each corner cavity unit 12 has a chamfered structure at its four corners to increase the number of reflections of light in the reflector cup cavities 11 of the corner cavity unit 12, so that the light is utilized more fully, thereby making the corner cavity unit 12 (i.e., the four corners of the reflector cup 1) brighter, thus well meeting the requirements of area scanning uniformity and greatly improving the optical effect.
[0022] The specific structure of the reflective cup described in Embodiment 1 is described in detail below.
[0023] Please continue to refer to the appendix. Figure 3 and attached Figure 4As shown, in this embodiment 1, the chamfered structures at the four corners of the corner cavity unit 12 are optimized as follows: in each corner cavity unit 12, an R-curved edge 113 (the R-curved edge 113 is a rounded edge formed by chamfering) is provided on the bottom opening 110 of the four reflective cup single cavities 11 corresponding to the four corner positions of the corner cavity unit 12; and a reflective arc surface 114 is provided on the reflective side surface 111 of at least one reflective cup single cavity 11 corresponding to a corner position of the corner cavity unit 12. It can be understood that the R-curved edge 113 and the reflective arc surface 114 are the chamfered structures at the four corner positions of the corner cavity unit 12. The R-curved edge 113 and the reflective arc surface 114 enable multiple reflections of light entering the reflective cup single cavity 11, allowing for more efficient use of the light and significantly improving brightness. Moreover, the R-arc edge 113 and the reflective arc surface 114 are easy to process and manufacture, and have low manufacturing costs, which effectively improves the processing quality and efficiency of the reflective cup.
[0024] In addition, to ensure that the light reflection effect of the R-arc edge 113 and the reflective arc surface 114 in the corner cavity unit 12 better meets the product design requirements, this embodiment 1 further optimizes the position, layout, and structural parameters of the R-arc edge 113 and the reflective arc surface 114 in the corner cavity unit 12 as follows: ① Please continue to refer to the appendix Figure 4 As shown, each corner cavity unit 12 has a diagonal A120 and a diagonal B121. In the corner cavity unit 12, the R-arc edges 113 on two of the reflector cup single cavities 11 are optimally positioned on the diagonal A120 and are mirror-symmetrically arranged with respect to the center of the diagonal A120. The R-arc edges 113 on the remaining two reflector cup single cavities 11 are optimally positioned on the diagonal B121 and are mirror-symmetrically arranged with respect to the center of the diagonal B121. Furthermore, the diagonal A120 and the diagonal B121 are perpendicular to each other and bisect each other. ② Please continue to refer to the appendix. Figure 4 As shown, in each of the corner cavity units 12, the top openings 112 on the four reflective cup single cavities 11 are all square, and the bottom openings 110 are special square shapes with the R-curved edges 113. Further, the shape of the bottom opening 110 in the corner cavity unit 12 can be described as follows: Please refer to the appendix... Figure 5As shown, the bottom opening 110 consists of two first straight segments 1101 connected vertically to form an L-shape, two second straight segments 1102 connected vertically to the ends of the two first straight segments 1101 that are far apart from each other, and an R-shaped arc edge 113 connecting the ends of the two second straight segments 1102 that are close to each other. Furthermore, in each corner cavity unit 12, the R-shaped arc edges 113 on the four reflector cup single cavities 11 all satisfy the relationship: R = L × (38% ~ 55%), where R is the radius of the circle containing the R-shaped arc edge 113, and L is the length of the first straight segment 1101. ③ Please continue to refer to the appendix. Figure 3 and attached Figure 4 As shown, in each of the four reflective cup cavities 11 of the corner cavity unit 12, the reflective side surface 111 of the reflective cup cavity 11 corresponding to the right-angle tip of the substrate 10 is provided with the reflective arc surface 114. Further, it can be understood that since the substrate 10 is rectangular, it has four corner positions, that is, four right-angle tips: K, L, M, and N; correspondingly, in the four corner cavity units 12, four reflective cup cavities 11 correspond to the above four right-angle tips respectively. The two reflective cup cavities 11 corresponding to K and M are both located on diagonal B121 and simultaneously on the outer side, while the two reflective cup cavities 11 corresponding to L and N are both located on diagonal A120 and simultaneously on the outer side. ④ Please continue to refer to the appendix. Figure 3 and attached Figure 4 As shown, the reflective arc surface 114 and the R arc edge 113 on the same reflective cup single cavity 11 are adjacent to each other, and the reflective arc surface 114 is also generally controlled to be a triangular concave arc surface.
[0025] Please continue to refer to the appendix. Figure 3 and attached Figure 6 As shown, in this embodiment 1, the single cavity 11 of the reflective cup that is not part of the corner cavity unit 12 adopts the conventional structure of the existing reflective cup. That is, in the structure of the single cavity 11 of the reflective cup that is not part of the corner cavity unit 12, the cross section of the bottom opening 110 is square, and the reflective side 111 can be an arc surface or an inclined plane.
[0026] Of course, in the single-cavity structure of the reflective cup 11 of the corner cavity unit 12, the reflective side 111 can also be an arc surface or a sloping plane.
[0027] The following tests compare the performance of a traditional reflector cup and the reflector cup provided in Example 1. The specific test content and results are as follows: 1.1) Test content: Under the same conditions of using the same amount of light and other identical parameters, light simulations were performed on a traditional reflector and the reflector provided in Example 1; the simulation results are attached. Figure 8 As shown.
[0028] 1.2) Simulation results: From the appendix Figure 8 As can be seen, the light is noticeably sparser at the corners of a traditional reflector cup; see attached image for details. Figure 8 In Figure A), the area circled in red will naturally result in a darker corner. However, in the reflective cup provided in Embodiment 1, the light at the corner is increased and diffused outwards after being reflected by the R-corner surface 113, as can be seen in the attached figure. Figure 8 The part circled in red in Figure B) makes the corners brighter.
[0029] In summary, this application improves the reflector cup structure, significantly enhancing the brightness at the corners of the reflector cup, thereby effectively meeting the requirements for uniformity of area scanning and greatly improving the optical effect.
[0030] Example 2:
[0031] Please see the appendix Figure 7 As shown, this embodiment 2 provides a direct-lit backlight module, which includes a reflector cup 1 as provided in embodiment 1 above, a plurality of LED beads 2, a diffuser plate 3, and an optical film assembly. The plurality of LED beads 2 are respectively disposed in a plurality of reflector cup single cavities 11 of the reflector cup 1. The reflector cup single cavity 11 can block crosstalk, optimize optical effects, and improve brightness for the light emitted by the LED beads 2. The diffuser plate 3 is disposed above the reflector cup 1 and is used to uniformly diffuse the light emitted by the LED beads 2. The optical film assembly is disposed above the light-emitting surface of the diffuser plate 3 and is used to optimize the light emitted from the light-emitting surface of the diffuser plate 3.
[0032] Furthermore, the optical film assembly includes, from bottom to top, a lower diffuser film 4, a middle diffuser film 5, an upper diffuser film 6, and a DBEF film 7 (also known as a dual brightness enhancement film). The lower diffuser film 4 mainly functions to homogenize light and also serves to cover diffuser plates or other optical defects. The middle diffuser film 5 mainly functions to enhance light uniformity and optimize layering. The upper diffuser film 6 has high light transmittance, which can improve the viewing angle, increase the softness of the light source, and has the functions of both diffusion and protection of the middle diffuser film. The DBEF film 7 functions to brighten and enhance contrast.
[0033] The following tests the performance of the direct-lit backlight module using a traditional reflector cup structure and the direct-lit backlight module provided in Embodiment 2. The specific test content and results are as follows: 2.1) Test content: Under the same operating current and other identical operating parameters, CCD measurements were performed on a direct-lit backlight module using a traditional reflector cup structure and a direct-lit backlight module provided in Example 2; the CCD measurement images are attached. Figure 9 As shown.
[0034] 2.2) Measurement results: From the appendix Figure 9 As can be seen, the corner areas of the direct-lit backlight module using a traditional reflector cup structure are darker, as can be seen in the attached image. Figure 9 As shown in Figure A); however, the corners of the direct-lit backlight module provided in Embodiment 2 are very bright, as can be seen in the attached figure. Figure 9 As shown in Figure B).
[0035] In summary, based on the functional advantages of the reflector cup provided in Embodiment 1, the direct-lit backlight module provided in Embodiment 2 has uniform brightness distribution and excellent optical performance.
[0036] Example 3:
[0037] This embodiment 3 provides a display device, which includes a display panel and a direct-lit backlight module as provided in embodiment 2 above, wherein the display panel is disposed above the direct-lit backlight module.
[0038] Understandably, based on the functional advantages achieved by the reflective cup and the direct-lit backlight module described in this application, the display device has excellent display effects, making it more comfortable for users to watch and use, and providing a very good user experience.
[0039] Finally, it should be noted that the prefixes "first," "second," etc. (such as first straight line segment, second straight line segment, etc.) in the component names in this specification, as well as the suffixes "A," "B," etc. (such as diagonal A, diagonal B, etc.) in the component names, are only for the purpose of clarity of description and are not intended to limit the scope of implementation of this utility model patent.
[0040] Many specific details have been set forth in the above description to provide a full understanding of this utility model. However, the above description is only a preferred embodiment of this utility model, and this utility model can be implemented in many other ways different from those described herein. Therefore, this utility model is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, shall still fall within the protection scope of the technical solution of this utility model.
Claims
1. A reflective cup, comprising a substrate (10) and a plurality of reflective cup cavities (11) disposed on the substrate (10), each of the reflective cup cavities (11) having a bottom opening (110), a reflective side surface (111) surrounding and connected to the periphery of the bottom opening (110), and a top opening (112) disposed on the side of the reflective side surface (111) facing away from the bottom opening (110); characterized in that: A corner cavity unit (12) is provided at a corner of the substrate (10), consisting of four reflective cup single cavities (11) arranged in a 2×2 array. Each corner cavity unit (12) has a chamfered structure at its four corners to increase the number of reflections of light in the reflective cup single cavity (11).
2. The reflective cup according to claim 1, characterized in that: In the corner cavity unit (12), the bottom opening (110) of each of the four reflective cup single cavities (11) is provided with an R-arc edge (113), and at least one of the reflective cup single cavities (11) is provided with a reflective arc surface (114) on the reflective side surface (111).
3. The reflective cup according to claim 2, characterized in that: The corner cavity unit (12) has diagonal A and diagonal B; In the corner cavity unit (12), the R-arc edges (113) on the two reflector cup single cavities (11) are located on the diagonal A and are arranged in a mirror symmetry with the center of the diagonal A; the R-arc edges (113) on the remaining two reflector cup single cavities (11) are located on the diagonal B and are arranged in a mirror symmetry with the center of the diagonal B.
4. The reflective cup according to claim 3, characterized in that: In the corner cavity unit (12), the bottom opening (110) on each of the four reflector cup single cavities (11) is composed of two first straight segments (1101) connected vertically in an L shape, two second straight segments (1102) connected vertically at the ends that are far away from the two first straight segments (1101), and an R-arc edge (113) connecting the two ends that are close to the two second straight segments (1102). The R-arc edge (113) on each of the four reflector cup single cavities (11) satisfies the following relationship: R = L × (38% ~ 55%), where R is the radius of the circle on which the R-arc edge (113) is located, and L is the length of the first straight segment (1101).
5. The reflective cup according to claim 3, characterized in that: The substrate (10) is rectangular, and a plurality of the reflective cup single cavities (11) are arranged in a rectangular array on the substrate (10). Correspondingly, corner cavity units (12) are provided at the four corners of the substrate (10). In each of the four reflective cup single cavities (11) of the corner cavity unit (12), the reflective arc surface (114) is provided on the reflective side surface (111) of the reflective cup single cavity (11) corresponding to the right angle tip of the substrate (10).
6. The reflective cup according to claim 5, characterized in that: The reflective arc surface (114) belonging to the same single cavity (11) of the reflective cup is adjacent to the R arc edge (113) with the same side, and the reflective arc surface (114) is a triangular concave arc surface as a whole.
7. A direct-lit backlight module, characterized in that: The device includes a reflector cup (1) as described in any one of claims 1-6, a plurality of LED beads (2), a diffuser plate (3), and an optical film assembly. The plurality of LED beads (2) are respectively disposed in a plurality of reflector cup single cavities (11) of the reflector cup (1). The diffuser plate (3) is disposed above the reflector cup (1) and is used to uniformly diffuse the light emitted by the LED beads (2). The optical film assembly is disposed above the light-emitting surface of the diffuser plate (3) and is used to optimize the light emitted from the light-emitting surface of the diffuser plate (3).
8. The direct-lit backlight module according to claim 7, characterized in that: The optical film assembly includes a lower diffusion film (4), a middle diffusion film (5), an upper diffusion film (6), and a DBEF film (7) arranged sequentially from bottom to top.
9. A display device, characterized in that: Including the direct-lit backlight module as described in claim 7.