A high-brightness thin mini-led backlight structure
By using PDLC dimming film to replace multiple structural diffusion films in the Miniled backlight structure, the problem of excessive thickness of the traditional Miniled backlight structure is solved, and the product is thinner and cost reduction is achieved, while the LED light reflectivity is improved.
Patent Information
- Application Number
- CN202111521539.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-12-13
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2041-12-13
AI Technical Summary
In the traditional Miniled backlight structure, the total thickness of multiple structural diffusion films and printing dot diffusion plates is relatively large, which is difficult to meet the thickness requirements of ultra-thin products, resulting in an increase in the number of LEDs and an increase in costs.
PDLC dimming film is used to replace multiple structural diffusion films in the backlight, including PET substrate and refractive layer. By adjusting the refractive index and LED layout pitch, the number of LEDs is reduced, and the problem of insufficient layout space of the lamp board and PCB is solved.
It achieves a significant reduction in product thickness, reduces the amount of materials, improves the reflectivity of LED light, meets the needs of ultra-thin products, and reduces costs.
Smart Images
Figure CN114185199B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of backlight source production and manufacturing, and specifically to a high-brightness thinned mini-LED backlight structure. Background Art
[0002] Miniled technology products have many advantages such as high brightness, high contrast and partition control to save power. According to product specification requirements, they can be applied to products of different sizes from mobile phones to TVs.
[0003] In the traditional mini-led backlight material stacking Figure 1 As shown in the figure, from bottom to top, they are light board, BLT, QD, multiple structure diffusion films, BEF, and upper diffusion film. When the printed dot diffusion plate solution is adopted, the backlight material stacking is as follows: Figure 2 As shown, from bottom to top are the light board, BLT, QD, multiple structural diffusion films, BEF, and upper diffusion film.
[0004] Multiple structural diffusion films are placed above the light board to shield the LED dot mura. The total thickness of the multiple structural diffusion films and printed dot diffusion plates required by this solution is usually relatively thick, which is difficult to meet the thickness requirements of ultra-thin products. In order to minimize the thickness of the product, it is necessary to reduce the miniled pitch and increase the number of LEDs, which leads to a significant increase in cost. Summary of the invention
[0005] In order to solve the deficiencies mentioned in the above background technology, the purpose of the present invention is to provide a high-brightness thin miniled backlight structure, which uses PDLC dimming film miniled to replace the multiple structural diffusion films in the backlight, which can greatly reduce the product thickness and meet the demand for thinning products. At the same time, it reduces the number of materials to facilitate backlight assembly. In ultra-thin products, the LED arrangement pitch can be increased to reduce the number of LEDs, solving the problem of insufficient light board layout space and insufficient PCB layout space.
[0006] The purpose of the present invention can be achieved through the following technical solutions:
[0007] A high-brightness thin mini-LED backlight structure comprises a back plate, a PDLC dimming film is arranged inside the back plate, the PDLC dimming film comprises a PET substrate and a refractive layer, two PET substrates are arranged, the refractive layer is located between the two PET substrates, an ITO conductive circuit is arranged on the side of the PET substrate close to the refractive layer, the refractive layer comprises a polymer and a liquid crystal, two PDLC dimming films are arranged, and a transparent isolation film is arranged between the two PDLC dimming films.
[0008] As a preferred solution of the present invention, the refractive index of the lower PDLC dimming film is greater than the refractive index of the upper PDLC dimming film.
[0009] As a preferred solution of the present invention, the refractive index of the lower PDLC dimming film is in the range of 1.75-2.3, and the refractive index of the upper PDLC dimming film is in the range of 1.35-1.9.
[0010] As a preferred solution of the present invention, a light board, a BLT, a QD, a BEF and an upper diffusion film are sequentially arranged in the back panel from bottom to top.
[0011] As a preferred solution of the present invention, the PDLC dimming film is located between the BEF and the QD.
[0012] As a preferred solution of the present invention, the PDLC dimming film is located between the BLT and the light board.
[0013] Beneficial effects of the present invention:
[0014] 1. The present invention adopts PDLC dimming film miniled to replace multiple structural diffusion films in the backlight, which can greatly reduce the thickness of the product, meet the demand for thin products, and reduce the number of materials to facilitate backlight assembly. In ultra-thin products, LED arrangement pitch can be added to reduce the number of LEDs, solving the problem of insufficient light board layout space and insufficient PCB layout space;
[0015] 2. The present invention adopts two PDLC dimming films with different refractive indices, and the refractive index of the lower PDLC dimming film is greater than the refractive index of the upper PDLC dimming film, thereby improving the reflectivity of light emitted from the LED to the substrate. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present invention will be further described below in conjunction with the accompanying drawings.
[0017] Figure 1 This is a diagram of the backlight material stacking of traditional miniled;
[0018] Figure 2 It is another solution for the traditional mini-led backlight material stacking diagram;
[0019] Figure 3 is a diagram of stacking backlight materials of the present invention;
[0020] Figure 4 This is a diagram of stacking the PDLC dimming film materials of the present invention.
[0021] In the figure:
[0022] 1. Backplane; 2. PDLC dimming film; 3. PET substrate; 4. Refractive layer; 5. ITO conductive circuit; 6. Transparent isolation film; 7. Light board; 8. BLT; 9. QD; 10. BEF; 11. Upper diffusion film. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0024] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0025] like Figure 1-Figure 4 As shown, a high-brightness thin mini-LED backlight structure includes a back panel 1, a PDLC dimming film 2 is arranged inside the back panel 1, the PDLC dimming film 2 includes a PET substrate 3 and a refractive layer 4, two PET substrates 3 are provided, the refractive layer 4 is located between the two PET substrates 3, an ITO conductive circuit 5 is provided on the side of the PET substrate 3 close to the refractive layer 4, the refractive layer 4 includes a polymer and a liquid crystal, two PDLC dimming films 2 are provided, and a transparent isolation film 6 is provided between the two PDLC dimming films 2.
[0026] The refractive index of the lower PDLC dimming film 2 is greater than the refractive index of the upper PDLC dimming film 2 .
[0027] The refractive index of the lower PDLC dimming film 2 is in the range of 1.75-2.3, and the refractive index of the upper PDLC dimming film 2 is in the range of 1.35-1.9.
[0028] The back plate 1 is provided with a lamp board 7 , a BLT 8 , a QD 9 , a BEF 10 and an upper diffusion film 11 in sequence from bottom to top.
[0029] The PDLC dimming film 2 is located between the BEF 10 and the QD 9 .
[0030] The PDLC dimming film 2 is located between the BLT 8 and the light board 7 .
[0031] Using this device
[0032] When no power is applied, the liquid crystal molecules of the PDLC dimming film 2 are arranged in a disordered manner, and the light is refracted in a disordered manner in the PDLC dimming film 2, and the PDLC dimming film 2 is in a light-opaque state; when power is applied, the liquid crystal molecules of the PDLC dimming film 2 are arranged in an orderly manner, and the PDLC dimming film 2 is in a light-transmissive state. When adjusting different voltages, the liquid crystal molecules deflect at different angles to change the refraction angle of the light, so that some light can penetrate and some cannot. Further adjusting the voltage can adjust the PDLC dimming film 2 to completely shield the LED dot mura, thereby achieving an ideal backlight optical effect.
[0033] In some embodiments, the PDLC dimming film 2 can be arranged between the BLT 8 and the light board 7 according to actual usage, so as to be applicable to more different types of mini-led backlight structures.
[0034] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0035] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.
Claims
1. A high-brightness thin mini-led backlight structure, It is characterized in that The invention comprises a back plate (1), wherein a PDLC dimming film (2) is arranged inside the back plate (1), wherein the PDLC dimming film (2) comprises a PET substrate (3) and a refractive layer (4), wherein two PET substrates (3) are provided, wherein the refractive layer (4) is located between the two PET substrates (3), wherein an ITO conductive circuit (5) is provided on a side of the PET substrate (3) close to the refractive layer (4), wherein the refractive layer (4) comprises a polymer and a liquid crystal, wherein two PDLC dimming films (2) are provided, and wherein a transparent isolation film (6) is provided between the two PDLC dimming films (2); The refractive index of the lower PDLC dimming film (2) is greater than the refractive index of the upper PDLC dimming film (2); The refractive index of the lower PDLC dimming film (2) is in the range of 1.75-2.3, and the refractive index of the upper PDLC dimming film (2) is in the range of 1.35-1.
9.
2. The high brightness thin mini led backlight structure according to claim 1, It is characterized in that The back plate (1) is provided with a light board (7), a BLT (8), a QD (9), a BEF (10) and an upper diffusion film (11) in sequence from bottom to top.
3. The high brightness thin mini led backlight structure according to claim 2, It is characterized in that The PDLC dimming film (2) is located between the BEF (10) and the QD (9).
4. The high brightness thin mini led backlight structure according to claim 2, It is characterized in that The PDLC dimming film (2) is located between the BLT (8) and the light board (7).