Backlight structure for improving brightness uniformity
By using a backlight frame, an AG diffusion film and a regular arrangement of LED lamps in the backlight structure, the problem of uneven brightness in the prior art is solved, and a more uniform brightness distribution and higher display quality are achieved.
Patent Information
- Application Number
- CN202420643285.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-03-29
AI Technical Summary
In the existing backlight structure, the LED light source is a one-sided design, resulting in uneven brightness and light eye phenomenon, which affects the display quality of the display module.
Using a combined structure of a backlight frame, AG diffusion film and backlight light source plate, LED lights are distributed on the backlight light source plate in a regular arrangement and covered with the AG diffusion film to disperse light to achieve a more uniform brightness distribution.
Through this design, the uniformity of the brightness of the display area is achieved within 1%, which significantly improves the display quality, reduces the optical components and processing technology required in production, and improves production efficiency.
Smart Images
Figure CN222734610U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of display, in particular to a backlight structure for improving brightness uniformity. Background Art
[0002] With the development of science and technology, intelligent electronic devices can be seen everywhere in people's lives. Smart wearable products have been very popular in recent years, such as smart watches or smart bracelets. For display modules with TFT (thin film transistor) structure, the backlight structure is an indispensable component. The backlight structure provides light source for the display module to ensure the display quality of the display module. Therefore, the backlight structure plays a vital role in the display quality of the display module. Please refer to Figure 1 As shown, the backlight LED light sources in the existing backlight structure are all unilaterally designed. The number of LED lights depends on the final brightness required by the product. Since the LED light source is unilaterally designed, it is necessary to transmit the light to the entire module surface through optical components such as light guide plates. This structure will cause the brightness of the side where the LED light source is placed to be significantly brighter than the brightness of other areas. This phenomenon is called lamp eye, which will cause the problem of uneven display. At the same time, this design makes the brightness of the areas on both sides of the light source very dark, which will also show uneven display on the display module. Utility Model Content
[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a backlight structure for improving brightness uniformity.
[0004] The purpose of this utility model is achieved through the following technical solutions:
[0005] A backlight structure for improving brightness uniformity comprises: a backlight frame, an AG diffusion film and a backlight light source plate, wherein a limited position cavity is arranged on the backlight frame; the AG diffusion film comprises a diffusion film body and an AG film layer, wherein the AG film layer is arranged on one side surface of the diffusion film body; a plurality of LED lamps are arranged on the backlight light source plate, wherein each of the LED lamps is distributed on the entire surface of one side of the backlight light source plate in a regularly arranged structure; the AG diffusion film is arranged on one side surface of the backlight light source plate, and the backlight light source plate is accommodated in the limited position cavity.
[0006] In one embodiment, the AG film layer is disposed on a side surface of the diffusion film body close to the backlight source plate.
[0007] In one embodiment, the diffusion film includes a substrate layer and a diffusion layer, and the diffusion layer is disposed on a side of the substrate layer away from the AG film layer.
[0008] In one embodiment, the substrate layer is a PET substrate layer.
[0009] In one embodiment, the LED lights are distributed on the entire surface of one side of the backlight source plate in a spiral structure.
[0010] In one of the embodiments, the LED lights are distributed on the entire surface of one side of the backlight source panel in a rectangular array structure.
[0011] In one of the embodiments, the backlight frame includes an iron frame and a plastic frame, the plastic frame is built in a receiving cavity of the iron frame, and the plastic frame extends toward the backlight light source panel to form a limiting boss.
[0012] In one of the embodiments, it also includes a light-shielding glue, which is in a frame-shaped structure and is respectively attached to the limiting boss and the AG diffusion film.
[0013] In one embodiment, the light-shielding adhesive is a black light-shielding tape.
[0014] In one embodiment, the thickness of the black light-shielding tape is 0.05-0.15 mm.
[0015] Compared with the prior art, the utility model has at least the following advantages:
[0016] The backlight structure for improving brightness uniformity of the utility model is provided with a backlight frame, an AG diffusion film and a backlight light source board. Firstly, LED lamps are arranged on the backlight light source board in a regular manner so that the entire surface of the backlight light source board is illuminated. Then, an AG diffusion film is covered on the backlight light source board. The light of the backlight light source board is dispersed by the AG diffusion film so that the light can be distributed more evenly. At the same time, the upper brightness enhancement sheet, the lower brightness enhancement sheet, the light guide plate and the reflective film can be omitted, thereby reducing materials and processing technology and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.
[0018] Figure 1 A structural schematic diagram of the arrangement position of LED lamps in an existing backlight structure;
[0019] Figure 2 This is a schematic structural diagram of a backlight structure for improving brightness uniformity in one embodiment of the utility model;
[0020] Figure 3 It is a structural schematic diagram of a backlight source plate in an embodiment of the utility model;
[0021] Figure 4It is a structural schematic diagram of a backlight source plate in another embodiment of the utility model. DETAILED DESCRIPTION
[0022] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.
[0023] See also Figure 2 , Figure 3 and Figure 4 As shown, a backlight structure 10 for improving brightness uniformity includes: a backlight frame 100, an AG diffusion film 200 and a backlight light source plate 300, wherein a limited position cavity is arranged on the backlight frame 100; the AG diffusion film 200 includes a diffusion film body and an AG film layer, and the AG film layer is arranged on one side surface of the diffusion film body; a plurality of LED lamps are arranged on the backlight light source plate 300, and each LED lamp is distributed on the entire surface of one side of the backlight light source plate 300 in a regularly arranged structure; the AG diffusion film 200 is arranged on one side surface of the backlight light source plate 300, and the backlight light source plate 300 is accommodated in the limited position cavity.
[0024] It should be noted that the LED lamps 20 in the existing backlight structure are all unilaterally designed. The design structure of the unilateral LED lamp 20 causes the display module to present a display defect of uneven brightness. Therefore, it is usually necessary to ensure the uniformity of the light source by setting optical modules such as a light guide plate, a reflective film, an upper light-enhancing film, a lower light-enhancing film and a diffusion film. However, this setting method requires more optical components and materials, and more processing steps, and the production efficiency is low. Therefore, in this embodiment, first, the LED lamps are arranged on the backlight light source plate 300 in a regular arrangement so that the entire surface of the backlight light source plate 300 is illuminated, and then an AG diffusion film 200 is covered on the backlight light source plate 300. The AG diffusion film 200 disperses the light of the backlight light source plate 300 so that the light can be distributed more evenly; at the same time, optical components such as the upper light-enhancing film, the lower light-enhancing film, the light guide plate and the reflective film can be omitted, thereby reducing materials and processing technology and improving production efficiency. Through the design structure of the utility model, the uniformity of the brightness of the entire display area can be satisfied within 1%, that is, it is improved from the original 10% to 1%.
[0025] Preferably, the AG film layer is disposed on one side of the diffusion film body close to the backlight source plate 300. The AG (anti-glare) film layer can be disposed on the diffusion film body by magnetron sputtering coating, and the light emitted by the backlight source plate 300 is corrected into a uniform surface light source through the diffusion film body to achieve the effect of optical diffusion. At the same time, the AG film layer can reduce the reflection and glare of the light, that is, the AG diffusion film can improve the uniformity and display brightness of the display module, thereby improving the display quality.
[0026] Preferably, the diffusion film comprises a substrate layer and a diffusion layer, wherein the diffusion layer is disposed on a side of the substrate layer away from the AG film layer. An antistatic layer may be disposed on a side of the substrate layer away from the diffusion layer to play an antistatic role.
[0027] Preferably, the substrate layer is a PET (polyester) substrate layer. The PET substrate layer has good mechanical properties, so during the production and assembly process of the backlight structure, the risk of the AG diffusion film being scratched can be reduced.
[0028] See also Figure 3 As shown, in one embodiment, the LED lights are distributed in a spiral structure on the entire side of the backlight source plate 300. The width of the LED light source is equal to the spacing between adjacent light sources. The display module can be square, rectangular or circular. In this way, the entire backlight source plate 300 emits light, improving the uniformity of the light.
[0029] See also Figure 4 As shown, in another embodiment, the LED lights are distributed on the entire side of the backlight source plate 300 in a rectangular array structure. For example, the LED lights are first arranged in a row with the same spacing, and then distributed on the backlight source plate 300 in a full row of interval arrays, so that the entire surface of the backlight source plate 300 emits light, improving the uniformity of the light. The display module can be square, rectangular or circular.
[0030] In one embodiment, the backlight frame 100 includes an iron frame 110 and a plastic frame 120. The plastic frame 120 is built into the accommodating cavity of the iron frame 110. The plastic frame 120 extends toward the backlight light source board 300 to form a limiting boss 121. By limiting the backlight light source board 300 by the plastic frame, it is possible to reduce the possibility of collision and damage between the backlight light source board 300 and the backlight frame 100 during assembly or transportation.
[0031] In one embodiment, the backlight structure further includes a light shielding glue 400, which is a frame-shaped structure. The light shielding glue 400 is respectively attached to the limiting boss 121 and the AG diffusion film. The light shielding glue 400 is a frame-shaped structure, avoiding the display area, and at the same time, the light shielding glue 400 plays a role of shielding, thereby avoiding lateral light leakage. Preferably, the light shielding glue is a black light shielding tape, and the black light shielding tape has the best light shielding effect. Preferably, the thickness of the black light shielding tape is 0.05 to 0.15 mm.
[0032] In another embodiment, in order to reduce the light loss of the backlight light source panel 300, a reflective film or a white ink layer can be added between the backlight light source panel 300 and the bottom of the limiting cavity. The light emitted by the backlight light source panel 300 can be reflected back again through the reflective film or the white ink layer, thereby improving the utilization rate of the light from the backlight light source panel 300 and further improving the display brightness.
[0033] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A backlight structure for improving brightness uniformity, characterized in that: include: A backlight frame, wherein a limited position cavity is provided on the backlight frame; An AG diffusion film, the AG diffusion film comprising a diffusion film body and an AG film layer, the AG film layer being disposed on one side surface of the diffusion film body; and A backlight source plate, wherein a plurality of LED lamps are arranged on the backlight source plate, and each of the LED lamps is distributed on the entire surface of one side of the backlight source plate in a regularly arranged structure; The AG diffusion film is arranged on one side surface of the backlight source plate, and the backlight source plate is accommodated in the limiting cavity.
2. The backlight structure for improving brightness uniformity according to claim 1, characterized in that: The AG film layer is arranged on a side surface of the diffusion film body close to the backlight source plate.
3. The backlight structure for improving brightness uniformity according to claim 1, characterized in that: The diffusion film includes a substrate layer and a diffusion layer. The diffusion layer is arranged on a side of the substrate layer away from the AG film layer.
4. The backlight structure for improving brightness uniformity according to claim 3, characterized in that: The substrate layer is a PET substrate layer.
5. The backlight structure for improving brightness uniformity according to claim 1, characterized in that: The LED lamps are distributed on the entire surface of one side of the backlight source plate in a spiral structure.
6. The backlight structure for improving brightness uniformity according to claim 1, characterized in that: The LED lamps are distributed on the entire surface of one side of the backlight source plate in a rectangular array structure.
7. The backlight structure for improving brightness uniformity according to claim 1, characterized in that: The backlight frame comprises an iron frame and a plastic frame. The plastic frame is built in the accommodating cavity of the iron frame. The plastic frame extends toward the backlight light source panel to form a limiting boss.
8. The backlight structure for improving brightness uniformity according to claim 7, characterized in that: It also includes a light-shielding glue, which is in a frame-shaped structure and is respectively attached to the limiting boss and the AG diffusion film.
9. The backlight structure for improving brightness uniformity according to claim 8, characterized in that: The light-shielding adhesive is a black light-shielding adhesive tape.
10. The backlight structure for improving brightness uniformity according to claim 9, characterized in that: The thickness of the black light-shielding tape is 0.05-0.15 mm.