CSP backlight module and display device
By setting an inclined curved lens layer, a KSF phosphor layer, and a diffusion layer in the LED backlight module, the problem of poor light mixing effect between blue and green light chips was solved, achieving better light mixing effect and uniform light diffusion.
Patent Information
- Application Number
- CN202423291443.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In existing LED backlight display solutions, the mixing effect between blue and green light chips is poor, which easily leads to color differences.
The CSP backlight module includes first and second light-emitting units. Each light-emitting unit is provided with an inclined curved lens layer, and a KSF fluorescent layer, a diffusion layer and a reflective layer are sequentially covered on it. The lens layer covers the two light-emitting units without gaps, and the light is first focused towards the center and then diffused through the lens layer.
It improves the light mixing effect, reduces color difference, and achieves uniform light diffusion.
Smart Images
Figure CN223679484U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of backlight display, more particularly to a CSP backlight module and display device. BACKGROUND
[0002] LED backlight technology is a backlight technology that uses light-emitting diodes (LEDs) as light sources and is widely used in liquid crystal displays (LCDs) and television screens.
[0003] In the existing LED backlight display scheme, white light can be excited by the light source structure of parallel blue chips and green chips, but in this display scheme, the mutual mixing effect of blue chips and green chips is poor, and color difference is prone to occur. CONTENT OF THE UTILITY MODEL
[0004] The purpose of the present application is to provide a CSP backlight module and display device to solve the problem of poor mutual mixing effect of blue chips and green chips and easy color difference in the display process in the prior art using the light source structure of parallel blue chips and green chips.
[0005] Therefore, in a first aspect, the present application provides a CSP backlight module, comprising: a first light emitting unit, a second light emitting unit and a lens layer, the first light emitting unit and the second light emitting unit are arranged in parallel, and the lens layer covers the first light emitting unit and the second light emitting unit; the outer surface of the first light emitting unit and the second light emitting unit is provided with an inclined arc surface lens layer.
[0006] In combination with the CSP backlight module provided in the above-mentioned scheme, the first light emitting unit further comprises: a first LED chip, the inclined arc surface lens layer covers the first LED chip all around; a KSF fluorescent layer, covering the upper surface of the inclined arc surface lens layer; a diffusion layer, covering the upper surface of the KSF fluorescent layer; and a reflective layer, covering the upper surface of the diffusion layer.
[0007] In combination with the CSP backlight module provided in the above-mentioned scheme, the first LED chip is a blue chip.
[0008] In combination with the CSP backlight module provided in the above-mentioned scheme, the second light emitting unit further comprises: a second LED chip, the inclined arc surface lens layer covers the second LED chip all around; a KSF fluorescent layer, covering the upper surface of the inclined arc surface lens layer; a diffusion layer, covering the upper surface of the KSF fluorescent layer; and a reflective layer, covering the upper surface of the diffusion layer.
[0009] In combination with the CSP backlight module provided in the above-mentioned scheme, the second LED chip is a green chip.
[0010] In combination with the CSP backlight module provided in the above-mentioned scheme, the outer surface of the lens layer is a curved surface with an arc line.
[0011] The CSP backlight module provided in the scheme has a curved surface including a first curved surface and a second curved surface, the first curved surface is connected with the second curved surface, and a concave valley structure is formed at the connection.
[0012] The CSP backlight module provided in the scheme has a curved surface including a first curved surface and a second curved surface, the first curved surface is connected with the second curved surface, and a concave valley structure is formed at the connection.
[0013] The CSP backlight module provided in the scheme has a curved surface including a first curved surface and a second curved surface, the first curved surface is connected with the second curved surface, and a concave valley structure is formed at the connection.
[0014] In a second aspect, the application provides a display device including the CSP backlight module.
[0015] The CSP backlight module provided in the scheme has a curved surface including a first curved surface and a second curved surface, the first curved surface is connected with the second curved surface, and a concave valley structure is formed at the connection. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.
[0017] Figure 1 The CSP backlight module provided in the scheme has a curved surface including a first curved surface and a second curved surface, the first curved surface is connected with the second curved surface, and a concave valley structure is formed at the connection.
[0018] Figure 2 The CSP backlight module provided in the scheme has a curved surface including a first curved surface and a second curved surface, the first curved surface is connected with the second curved surface, and a concave valley structure is formed at the connection.
[0019] Figure 3 The CSP backlight module provided in the scheme has a curved surface including a first curved surface and a second curved surface, the first curved surface is connected with the second curved surface, and a concave valley structure is formed at the connection.
[0020] Figure 4 The CSP backlight module provided in the scheme has a curved surface including a first curved surface and a second curved surface, the first curved surface is connected with the second curved surface, and a concave valley structure is formed at the connection.
[0021] In the drawings, various reference signs are used.
[0022] 1, first light-emitting unit; 2, second light-emitting unit; 3, lens layer; 101, blue light chip; 102, inclined arc lens layer; 103, KSF fluorescent layer; 104, diffusion layer; 105, reflective layer; 201, green light chip; 301, first vertical surface; 302, first arc surface; 303, concave valley structure; 304, second arc surface; 305, second vertical surface. DETAILED DESCRIPTION
[0023] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.
[0024] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component. The terms "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or position based on the orientation or position shown in the drawings, and are only for convenience of description, and cannot be understood as a limitation on the technical solutions. The terms "first", "second" are only for the purpose of convenient description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "a plurality of" is two or more, unless otherwise specifically limited.
[0025] CSP (Chip Scale Package) technology is an advanced semiconductor packaging technology that allows the packaged chip size to approach or equal the size of the bare chip, greatly reducing the volume of the package. CSP technology exhibits its unique advantages in many aspects. The development of CSP technology is of great significance to the progress of the semiconductor packaging industry, which not only improves the performance of electronic products, but also provides the possibility for designing smaller and more efficient electronic systems.
[0026] LED display chips are increasingly using CSP packaging technology, which makes the size of the LED approach the size of the chip itself, helping to realize the miniaturization of LED products.
[0027] In the existing LED backlight display scheme, white light can be excited by the light source structure of parallel blue light chips and green light chips, but in this display scheme, the mutual light mixing effect of blue light chips and green light chips is poor, and color difference is prone to occur.
[0028] Therefore, the embodiment of the present application provides a CSP backlight module, as shown in the drawings, comprising: a first light emitting unit 1, a second light emitting unit 2 and a lens layer 3, the first light emitting unit 1 and the second light emitting unit 2 are arranged side by side, and the lens layer 3 covers the first light emitting unit 1 and the second light emitting unit 2; and the outer surfaces of the first light emitting unit 1 and the second light emitting unit 2 are provided with inclined arc surface lens layers 102. Figures 1-4 As shown in the drawings, comprising: a first light emitting unit 1, a second light emitting unit 2 and a lens layer 3, the first light emitting unit 1 and the second light emitting unit 2 are arranged side by side, and the lens layer 3 covers the first light emitting unit 1 and the second light emitting unit 2; and the outer surfaces of the first light emitting unit 1 and the second light emitting unit 2 are provided with inclined arc surface lens layers 102.
[0029] Specifically, in the embodiment, a double light source excitation scheme is adopted, the first light emitting unit 1 can excite blue light, and the light source can be a blue light chip 101. The second light emitting unit 2 can excite green light, and the light source can be a green light chip 201. The first light emitting unit 1 and the second light emitting unit 2 are arranged side by side, and the blue light and the green light excited by the first light emitting unit 1 and the second light emitting unit 2 are mixed and refracted through the externally arranged lens layer 3, and then transmitted outward.
[0030] The outer surfaces of the first light emitting unit 1 and the second light emitting unit 2 are provided with inclined arc surface lens layers 102, which can diffuse the light excited by the blue light chip 101 and the green light chip 201 once, so that the light excited by the blue light chip 101 and the green light chip 201 is more uniformly diffused, which is beneficial to further outward diffusion through the lens layer 3.
[0031] In an embodiment, the first light emitting unit 1 and the second light emitting unit 2 can be arranged at intervals or in contact with each other, and the distance between the first light emitting unit 1 and the second light emitting unit 2 can be reasonably set according to the light mixing effect of the lens layer 3 of different structures.
[0032] Compared with the prior art, the embodiment first collects and mixes the light emitted by the first light emitting unit 1 and the second light emitting unit 2 to the middle, and then uniformly diffuses the light path through the diffusion layer 104, so that the light mixing effect is better, and the purpose of reducing color difference is achieved.
[0033] In an embodiment, the first light emitting unit 1 further comprises: a first LED chip, the inclined arc surface lens layer 102 is wrapped around the first LED chip; a KSF fluorescent layer 103, covering the upper surface of the inclined arc surface lens layer 102; a diffusion layer 104, covering the upper surface of the KSF fluorescent layer 103; and a reflection layer 105, covering the upper surface of the diffusion layer 104.
[0034] Specifically, in the embodiment, the first light emitting unit 1 comprises a first LED chip, a tilted arc lens layer 102, a KSF fluorescent layer 103, a diffusion layer 104 and a reflective layer 105. The first LED chip can be the blue light chip 101 described above, and the tilted arc lens layer 102 is packaged by CSP packaging technology. The shape of the tilted arc lens layer 102 can be reasonably set according to the light diffusion effect. The tilted arc lens layer 102 can be gaplessly wrapped around the four sides of the blue light chip 101.
[0035] The KSF fluorescent layer 103 is arranged on the surface of the tilted arc lens layer 102, and the KSF fluorescent layer 103 can completely cover the tilted arc lens layer 102. The diffusion layer 104 is arranged on the surface of the KSF fluorescent layer 103, and the reflective layer 105 is arranged on the surface of the diffusion layer 104.
[0036] A part of the light emitted from the front of the blue light chip 101 is refracted, and then sequentially passes through the tilted arc lens layer 102, the KSF fluorescent layer 103, the diffusion layer 104 and the reflective layer 105, and is emitted from the front of the blue light chip 101; and another part of the light is refracted back to the tilted arc lens layer 102 by the KSF fluorescent layer 103, the diffusion layer 104 and the reflective layer 105, and is directly emitted from the side of the blue light chip 101. Through multiple refraction and reflection, the light emitted by the blue light chip 101 is uniformly diffused outward.
[0037] In an embodiment, the second light emitting unit 2 further comprises: a second LED chip, a tilted arc lens layer 102 wrapped around the four sides of the second LED chip; a KSF fluorescent layer 103 covering the tilted arc lens layer 102; a diffusion layer 104 covering the KSF fluorescent layer 103; and a reflective layer 105 covering the diffusion layer 104.
[0038] Specifically, in the embodiment, the second light emitting unit 2 comprises a second LED chip, a tilted arc lens layer 102, a KSF fluorescent layer 103, a diffusion layer 104 and a reflective layer 105. The second LED chip can be the green light chip 201 described above, and the tilted arc lens layer 102 is packaged by CSP packaging technology. The shape of the tilted arc lens layer 102 can be reasonably set according to the light diffusion effect. The tilted arc lens layer 102 can be gaplessly wrapped around the four sides of the green light chip 201.
[0039] The KSF fluorescent layer 103 is arranged on the surface of the tilted arc lens layer 102, and the KSF fluorescent layer 103 can completely cover the tilted arc lens layer 102. The diffusion layer 104 is arranged on the surface of the KSF fluorescent layer 103, and the reflective layer 105 is arranged on the surface of the diffusion layer 104.
[0040] Part of the light emitted from the front of the green light chip 201 is refracted and then transmitted through the inclined arc lens layer 102, the KSF fluorescent layer 103, the diffusion layer 104 and the reflective layer 105 and emitted from the front of the green light chip 201; and the other part of the light is refracted back to the inclined arc lens layer 102 by the KSF fluorescent layer 103, the diffusion layer 104 and the reflective layer 105 and directly emitted from the side of the green light chip 201. After multiple refraction and reflection, the light emitted from the green light chip 201 is uniformly diffused outward.
[0041] In an embodiment, the outer surface of the lens layer 3 is a curved surface with an arc line. The curved surface includes a first arc surface 302 and a second arc surface 304, and the first arc surface 302 is connected with the second arc surface 304 to form a concave valley structure 303 at the connection. The curved surface further includes a first vertical surface 301 and a second vertical surface 305, and the first vertical surface 301 is connected with the first arc surface 302, and the second vertical surface 305 is connected with the second arc surface 304.
[0042] Specifically, in the embodiment, the outer surface of the lens layer 3 includes the first arc surface 302 and the second arc surface 304, which can be integrally formed and have a circular arc shape. Therefore, the first arc surface 302 and the second arc surface 304 are connected to form the concave valley structure 303, and the first light emitting unit 1 and the second light emitting unit 2 are arranged inside the lens layer 3 and located at the middle position of the concave valley structure 303. The lens layer 3 forms two convex lens structures on both sides of the first light emitting unit 1 and the second light emitting unit 2, so that the beam angle of the first light emitting unit 1 and the second light emitting unit 2 can be further opened by the first arc surface 302 and the second arc surface 304, and the backlight module has a larger light emitting angle.
[0043] In an embodiment, the lens layer 3 covers the first light emitting unit 1 and the second light emitting unit 2 without gaps.
[0044] Specifically, in the embodiment, the lens layer 3 covers the first light emitting unit 1 and the second light emitting unit 2 without gaps, and the lens layer 3 is combined with the first light emitting unit 1 and the second light emitting unit 2 without gaps, so that the first light emitting unit 1 and the second light emitting unit 2 have sufficient light emitting angles, the half-intensity angle in one direction is more than 160 degrees, and the uniform diffusion of light is facilitated.
[0045] In addition, the embodiment of the present application further provides a display device including the CSP backlight module as described above.
[0046] Specifically, in the embodiment, the display device comprises a substrate and a CSP backlight module, the substrate has a light emitting circuit thereon, and the CSP backlight module is electrically connected with the light emitting circuit; the CSP backlight module can be mainly welded on the substrate by flip technology, and the CSP backlight module emits white light in the light emitting direction by driving of the light emitting circuit on the substrate.
[0047] In the embodiment, the CSP backlight module adopts a double light source excitation scheme, i.e., mixed light emission by the blue light chip 101 and the green light chip 201. The outer surfaces of the blue light chip 101 and the green light chip 201 are provided with the inclined arc lens layer 102 to diffuse the light excited by the blue light chip 101 and the green light chip 201 once. The distance between the blue light chip 101 and the green light chip 201 can be set according to the light mixing effect of the lens layer 3 of different structures.
[0048] The KSF fluorescent layer 103 is arranged on the surface of the inclined arc lens layer 102, and the KSF fluorescent layer 103 can completely cover the inclined arc lens layer 102. The diffusion layer 104 is arranged on the surface of the KSF fluorescent layer 103, and the reflection layer 105 is arranged on the surface of the diffusion layer 104.
[0049] Part of the light emitted from the front of the blue light chip 101 or the green light chip 201 passes through refraction, and then sequentially passes through the inclined arc lens layer 102, the KSF fluorescent layer 103, the diffusion layer 104 and the reflection layer 105 and is emitted from the front of the blue light chip 101; and the other part of the light is refracted back to the inclined arc lens layer 102 by the KSF fluorescent layer 103, the diffusion layer 104 and the reflection layer 105, and is directly emitted from the side of the blue light chip 101 or the green light chip 201. After multiple refraction and reflection, the light emitted by the blue light chip 101 or the green light chip 201 is uniformly diffused outward.
[0050] The blue light chip 101, the inclined arc lens layer 102, the KSF fluorescent layer 103, the diffusion layer 104 and the reflection layer 105 constitute the first light emitting unit 1. The blue light chip, the inclined arc lens layer 102, the KSF fluorescent layer 103, the diffusion layer 104 and the reflection layer 105 constitute the second light emitting unit 2.
[0051] The outer surface of the lens layer 3 covering the first light emitting unit 1 and the second light emitting unit 2 is a curved surface with an arc. The curved surface includes a first arc surface 302 and a second arc surface 304, and the first arc surface 302 is connected with the second arc surface 304 to form a concave valley structure 303 at the connection. The curved surface also includes a first vertical surface 301 connected with the first arc surface 302 and a second vertical surface 305 connected with the second arc surface 304. The first arc surface 302 and the second arc surface 304 can be integrally formed, and the surfaces of the two can be provided in a circular arc shape. Therefore, the first arc surface 302 and the second arc surface 304 are connected to form the concave valley structure 303, and the first light emitting unit 1 and the second light emitting unit 2 are arranged inside and located at the middle position of the concave valley structure 303. The lens layer 3 forms two convex lens structures on both sides of the first light emitting unit 1 and the second light emitting unit 2, so that the beam angle of the first light emitting unit 1 and the second light emitting unit 2 can be further opened through the first arc surface 302 and the second arc surface 304, and the backlight module has a larger light emitting angle.
[0052] The display device provided by the present application is provided with a CSP backlight module. The CSP backlight module separately arranges the first light emitting unit 1 and the second light emitting unit 2 as inclined arc lens layers 102, and sequentially arranges a KSF fluorescent layer 103, a diffusion layer 104 and a reflection layer 105 on the inclined arc lens layers 102. On this basis, the lens layer 3 is coated on the outer surface of the first light emitting unit 1 and the second light emitting unit 2. The light emitted by the first light emitting unit 1 and the second light emitting unit 2 is first collected and mixed in the middle, and then uniformly diffused through the light path of the diffusion layer 104, so that the light mixing effect is better, the color difference is reduced, and the technical problem of poor light mixing effect between the blue light chip 101 and the green light chip 201 in the display process and easy color difference in the prior art is solved.
[0053] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A CSP backlight module, characterized in that, The application relates to a CSP backlight module. The first light-emitting unit and the second light-emitting unit are provided with inclined cambered lens layers on outer surfaces. The first light-emitting unit further comprises:
2. The CSP backlight module according to claim 1, wherein, A first LED chip, and the inclined cambered lens layer is arranged around the first LED chip; A KSF fluorescent layer is arranged above the inclined cambered lens layer; A diffusion layer is arranged above the KSF fluorescent layer; A reflection layer is arranged above the diffusion layer. The first LED chip is a blue light chip.
3. The CSP backlight module of claim 2, wherein, The second light-emitting unit further comprises:
4. The CSP backlight module of claim 1, wherein, A second LED chip, and the inclined cambered lens layer is arranged around the second LED chip; A KSF fluorescent layer is arranged above the inclined cambered lens layer; A diffusion layer is arranged above the KSF fluorescent layer; A reflection layer is arranged above the diffusion layer. The second LED chip is a green light chip.
5. The CSP backlight module according to claim 4, wherein, An outer surface of the lens layer is a curved surface with an arc line.
6. The CSP backlight module according to claim 1, wherein, The curved surface comprises a first cambered surface and a second cambered surface, the first cambered surface is connected with the second cambered surface, and a concave wave valley structure is formed at the connection position.
7. The CSP backlight module according to claim 6, wherein, The curved surface further comprises a first vertical surface and a second vertical surface, the first vertical surface is connected with the first cambered surface, and the second vertical surface is connected with the second cambered surface.
8. The CSP backlight module according to claim 7, wherein, The lens layer covers the first light-emitting unit and the second light-emitting unit without gaps.
9. The CSP backlight module according to any one of claims 1-8, wherein, The application further relates to a CSP backlight module comprising the CSP backlight module as claimed in any one of claims 1-9.
10. A display device, characterized by comprising: