Ultrathin liquid crystal display device based on blue light COB and multi-partition quantum material

Abstract

The utility model discloses an ultrathin liquid crystal display device based on a blue light COB and a multi-partition quantum material, which comprises a liquid crystal display panel, a composite optical film, a quantum diffusion plate, a back plate, reflection paper and a light-emitting chip matrix which are sequentially attached together, the reflection paper is attached to the back plate, and the light-emitting chip matrix is installed on the surface of the reflection paper; the light-emitting chip matrix on the back plate comprises a short-distance light mixing area and a long-distance light mixing area, and the light mixing distance of the short-distance light mixing area is smaller than the light mixing distance of the long-distance light mixing area; the quantum diffusion plate is provided with a low-concentration quantum region and a high-concentration quantum region; and the quantum diffusion plate corresponds to the light-emitting chip matrix surface of the back plate. The multi-light-mixing-distance blue-light COB light source, the size-differentiated light source and dynamic backlight control are adopted, high-color-gamut expression is achieved, the brightness uniformity of the display device is improved, the color difference of a light-mixing connection band is eliminated through the concentration gradual change design of quantum dot materials, and the brightness uniformity is obviously improved.

Description

Technical Field

[0001] This utility model relates to liquid crystal display devices, and more specifically, to an ultra-thin liquid crystal display device based on blue light COB and multi-zone quantum materials. Background Technology

[0002] Traditional direct-lit LCD devices mostly use white LEDs as the light source or LEDs combined with phosphors as the light source. White LEDs as the light source have insufficient color gamut coverage, making it difficult to meet the requirements of HDR (High Dynamic Range) display. The single light mixing distance leads to inconsistent light diffusion effects in different areas, resulting in poor uniformity and easy occurrences of brightness banding, narrow color gamut, and low luminous efficiency. To achieve uniform light mixing, the optical distance needs to be increased. At the same time, the power module of the direct-lit flat back panel structure is located on the back of the backlight module, resulting in an additional "backpack" on the back of the display device, which restricts the overall thinness and lightness of the display device.

[0003] To improve the narrow color gamut of display devices, existing technologies use quantum dot technology to enhance the color gamut, such as Chinese patent document CN.221303758.U. This technical solution includes an LED bead with a light-emitting surface and a quantum dot sheet disposed on the light-emitting surface of the LED bead. By setting the quantum dot sheet on the light-emitting surface, the LED bead can be color-converted. Although this technical solution can achieve LED bead color conversion, its quantum dot material concentration is fixed and cannot adapt to the differentiated optical requirements under different light mixing distances. Utility Model Content

[0004] This invention overcomes the shortcomings of the prior art and provides an implementation method for an ultra-thin liquid crystal display device based on blue light COB and multi-zone quantum materials, in order to solve the problems of narrow color gamut and poor viewing experience of existing display devices.

[0005] To solve the above-mentioned technical problems, one embodiment of this utility model adopts the following technical solution:

[0006] An ultrathin liquid crystal display device based on blue COB and multi-zone quantum materials includes a liquid crystal display panel, a composite optical film, and a quantum diffusion plate sequentially bonded together; it also includes a backlight module, which comprises a back plate, a reflective paper, and a light-emitting chip matrix composed of multiple light-emitting chips. The reflective paper is bonded to the back plate, and the light-emitting chip matrix is ​​mounted on the surface of the reflective paper. The light-emitting chip matrix on the back plate includes a near-distance mixing region and a far-distance mixing region, with the mixing distance of the near-distance mixing region being smaller than that of the far-distance mixing region. The quantum diffusion plate has a low-concentration quantum region and a high-concentration quantum region, with the concentration of quantum dot material in the low-concentration quantum region being lower than that in the high-concentration quantum region. The high-concentration quantum region of the quantum diffusion plate corresponds to the near-distance mixing region, and the low-concentration quantum region corresponds to the far-distance mixing region.

[0007] One possible solution is: a protrusion runs horizontally through the middle of the back plate, and the back plate is divided into three areas, including a long-distance mixing area at the upper end of the protrusion, a long-distance mixing area at the lower end, and a short-distance mixing area on the protrusion. By forming a protrusion that runs horizontally through the middle of the back plate, the mixing distance of the light-emitting chip matrix is ​​changed; the quantum diffusion plate is divided into three areas, including a low-concentration quantum region at the upper end, a high-concentration quantum region in the middle, and a low-concentration quantum region at the lower end.

[0008] Another alternative is that the back plate has a protrusion in the middle and is divided into two areas, including a near-distance mixing area on the protrusion and a far-distance mixing area surrounding the near-distance mixing area. The mixing distance of the light-emitting chip matrix is ​​changed by forming a protrusion in the middle of the back plate. The quantum diffusion plate is divided into two areas, including a high-concentration quantum region in the middle and a low-concentration quantum region surrounding the high-concentration quantum region.

[0009] The low-concentration quantum region and the high-concentration quantum region are distinguished by the concentration of quantum dot material in the two regions, which are relatively high and low. The quantum diffusion plate has at least two quantum regions with different concentrations, and the near-distance mixing region and the far-distance mixing region are distinguished by the relative distance between them.

[0010] Furthermore: the light-emitting chips in the long-distance mixing zone and the short-distance mixing zone are blue COB light sources. The light-emitting chips in the long-distance mixing zone form a low-density dot matrix light source, and the light-emitting chips in the short-distance mixing zone form a high-density dot matrix light source.

[0011] A dot matrix light source is composed of an array of light-emitting chips. The density of light-emitting chips in the far-distance mixing area and the near-distance mixing area is different. Based on the relative density of the dot matrix light source in different areas, it is divided into low-density dot matrix light sources and high-density dot matrix light sources. That is, the density of the dot matrix light source in the far-distance mixing area is less than the density of the dot matrix light source in the near-distance mixing area.

[0012] Furthermore, a gradient mixing zone is formed between the far-distance mixing zone and the near-distance mixing zone, and the density of the light-emitting chips in the mixing zone gradually increases from the far-distance mixing zone to the near-distance mixing zone.

[0013] Furthermore, the junction of the high-concentration quantum region and the low-concentration quantum region is a transition region, in which the concentration of quantum dot material increases linearly from the low-concentration quantum region to the high-concentration quantum region.

[0014] One possible structure for the quantum diffusion plate is that the quantum diffusion plate is made of a polymer substrate, quantum dot material, and diffusion particles through an injection molding process.

[0015] Another alternative is that the quantum diffusion plate has a layered structure, including a microprism diffusion plate, a quantum dot material layer, and a diffusion film. The quantum dot material layer is coated on the microprism diffusion plate in sections using high-precision printing technology, and the diffusion film is attached to the side of the microprism diffusion plate coated with quantum dot material.

[0016] Furthermore, in the far-distance mixing zone of the backlight module, the size of the light-emitting chips that make up the light-emitting chip matrix is ​​larger than the size of the light-emitting chips in the near-distance mixing zone, and the light emission angle of the light-emitting chips in the far-distance mixing zone is wider than that of the light-emitting chips in the near-distance mixing zone.

[0017] Furthermore: the light-emitting chips on the far-distance mixing zone, the light-emitting chips on the near-distance mixing zone, and the light-emitting chips in the mixing zone are electrically connected to the dynamic control module.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects: The present invention achieves high color gamut performance and improves the brightness uniformity of display devices by adopting multi-mixing distance blue COB light source, size-differentiated light source and dynamic backlight control. By using the concentration gradient design of quantum dot material to eliminate color difference in the mixing transition zone, the brightness uniformity is significantly improved, and the problems of narrow color gamut and poor uniformity of traditional backlight modules are solved. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the backlight module of this utility model;

[0021] Figure 3 This is a schematic cross-sectional view of the quantum diffusion plate of this utility model;

[0022] Figure 4 This is a schematic diagram of the quantum dot material coating of this utility model;

[0023] Figure 5 This is a microscopic schematic diagram of the surface structure of the microprism diffusion plate of this utility model;

[0024] The numbers in the diagram are as follows: 1. Liquid crystal display panel; 2. Composite optical film; 3. Quantum diffusion plate; 301. Low-concentration quantum region; 302. High-concentration quantum region; 303. Transition region; 4. Back plate; 5. Reflective paper; 6. Light-emitting chip; 7. Boss; 8. Long-distance light mixing region; 9. Short-distance light mixing region; 10. Back cover; 11. Microprism diffusion plate. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0026] Example 1

[0027] like Figure 1 , 2 The image shows an ultra-thin liquid crystal display device based on blue COB and multi-zone quantum materials. The liquid crystal display device employs a composite backlight architecture, including a liquid crystal display panel 1, a composite optical film 2, and a quantum diffusion plate 3. The composite optical film 2 is bonded to the rear of the liquid crystal display panel 1, and the light-emitting surface of the quantum diffusion plate 3 is bonded to the rear of the composite optical film 2. The liquid crystal display device also includes a backlight module, which comprises a back plate 4, a reflective paper 5, and a light-emitting chip matrix formed by multiple light-emitting chips 6. The reflective paper 5 is bonded to the back plate 4, and the light-emitting chip matrix is ​​mounted on the surface of the reflective paper 5. The side of the back plate 4 where the light-emitting chips 6 are mounted corresponds to the light-incoming surface of the quantum diffusion plate 3. The back plate 4 has a protrusion 7 that horizontally penetrates the entire back plate 4, dividing the light-emitting chip matrix on the back plate 4 into three zones: a long-distance mixing zone 8 at the upper and lower ends of the back plate 4, and a short-distance mixing zone 9 on the protrusion 7. The liquid crystal display device also includes a rear cover 10 covering the rear of the back plate 4. The light-emitting chip 6 provides a backlight source for the liquid crystal display device. The reflective paper 5 reflects the disordered light emitted by the light-emitting chip 6, reducing light loss and improving backlight brightness. The quantum diffusion plate 3 and the composite optical film 2 expand the color gamut and improve the light efficiency. The backlight module with protrusions 7 provides a differentiated light mixing distance for the quantum diffusion plate 3, making the light diffusion in different areas more uniform and reducing brightness banding.

[0028] like Figure 2 As shown: The light-emitting chips 6 in the far-distance mixing zone 8 are blue COB light sources, densely arranged within the far-distance mixing zone 8 to form a low-density dot matrix light source. The spacing between each light-emitting chip 6 is determined by a topology optimization algorithm to ensure that the light diffusion range covers the target area. The light-emitting chips 6 in the near-distance mixing zone 9 are also blue COB light sources, densely arranged on the protrusions 7 of the back plate 4 to form a high-density dot matrix light source. Their spacing is significantly smaller than the spacing between the light-emitting chips in the far-distance mixing zone 8 to enhance the illumination intensity of the near-distance mixing zone 9. The spacing between each light-emitting chip 6 in the near-distance mixing zone 9 is also determined by a topology optimization algorithm to ensure that the light diffusion range covers the target area. A gradient mixing band is formed between the light-emitting chips 6 at the boundary between the far-distance mixing zone 8 and the near-distance mixing zone 9. The density of the light-emitting chips in the mixing band gradually increases from the far-distance mixing zone to the near-distance mixing zone, forming a gradient mixing architecture to achieve a natural transition between brightness and mixing distance.

[0029] Topology optimization process: Based on a ray tracing model, the target optical properties (such as uniformity, color difference limits, and thickness constraints) are input; optimization variables include light source arrangement, power of the light-emitting chip, and mixing distance; the optimal matching scheme is obtained. Implementation results: The gradient of the light-emitting chip is highly adapted to the quantum diffuser, further improving brightness uniformity and color gamut performance.

[0030] like Figure 3 As shown: Quantum diffusion plate 3 is a multi-zone quantum diffusion plate, which includes a polymer substrate, quantum dot material, and diffusion particles; the polymer substrate can be a polymer with high light transmittance such as PC, PMMA, PS, etc., the quantum dot material is a core-shell structure that emits green and red light, and the diffusion particles are nano-sized inorganic particles or are produced using a foaming process. To improve the color gamut optimization and color performance of the display device, the quantum diffusion plate 3 is divided into three zones: a low-concentration quantum zone 301 at the top, a high-concentration quantum zone 302 in the middle, and a low-concentration quantum zone 301 at the bottom. The high-concentration quantum zone 302 corresponds to the near-distance mixing zone 9 of the backlight module, and the low-concentration quantum zone 301 corresponds to the far-distance mixing zone 8. The concentration of quantum dot material in the high-concentration quantum zone 302 is relatively higher than that in the low-concentration quantum zone 301. The intersection of the high-concentration quantum zone 302 and the low-concentration quantum zone 301 is the transition zone 303. The concentration of quantum dot material in the transition zone 303 increases linearly, that is, it increases linearly from the low-concentration quantum zone 301 to the high-concentration quantum zone 302, ensuring a more natural color gamut optimization and avoiding the problem of poor color gamut uniformity.

[0031] The quantum diffusion plate 3 uses a high-temperature and high-pressure co-extrusion molding process to achieve a zoned concentration gradient. The mold design ensures a smooth transition zone without interfaces. After molding, the cooling rate needs to be controlled to avoid the degradation of quantum dot performance.

[0032] Topology optimization process: Based on a ray tracing model, the input targets optical properties (such as uniformity, color difference limits, and thickness constraints); optimization variables include light source arrangement, quantum dot concentration gradient, and diffuser microstructure parameters; the output is the optimal matching scheme between the light source and the quantum dot layer. Implementation results: The quantum dot concentration gradient and light source arrangement are highly compatible, the transition zone width is compressed, and brightness uniformity and color gamut performance are further improved.

[0033] In addition, the back panel 4 adopts the design of a boss 7, and the power module of the LCD display device can be installed in the mounting cavity between the rear of the boss 7 and the back cover 10, saving space to the maximum extent and allowing the back cover 10 to be designed as a flat surface, further reducing the thickness of the whole machine. When used in the TV field, it makes the TV fit the wall and wall panel more closely, which can improve the aesthetics and save space to the maximum extent.

[0034] Example 2

[0035] This embodiment is basically the same as Embodiment 1, except that: the size of the light-emitting chip 6 in the far-distance mixing zone 8 of the backlight module is larger than the size of the light-emitting chip 6 in the near-distance mixing zone 9, and the emission angle of the light-emitting chip 6 in the far-distance mixing zone 8 is wider than that in the near-distance mixing zone 9 (for example, the emission angle of the far-distance mixing zone is 40°, and the emission angle of the near-distance mixing zone is 20°, which does not constitute a limitation on the emission angle). The large-size, wide-emission-angle light-emitting chip in the far-distance mixing zone 8 makes the light effect coverage of the backlight module more uniform, reduces edge brightness attenuation, and ensures color consistency of the display device; the small-size, narrow-emission-angle light-emitting chip in the near-distance mixing zone 9 can reduce light diffusion, concentrate light in a specific direction, improve contrast and pixel independence, and achieve high-precision display.

[0036] Example 3

[0037] This embodiment is basically the same as embodiment 1, except that the quantum diffusion plate 3 has a layered structure. Specifically, the quantum diffusion plate 3 includes a microprism diffusion plate 11 (e.g., ...). Figure 5 Quantum dot materials and diffusion films; quantum dot materials are applied in sections on the microprism diffusion plate 11 using high-precision printing technology to form a quantum dot material layer (e.g., Figure 4 A diffusion film is adhered to the side of the quantum dot material coated on the microprism diffusion plate 11. The specific partitioning method of the quantum dot material on the microprism diffusion plate 11 is the same as that of the quantum diffusion plate 3 in Example 1, and the concentration arrangement of the quantum dot material is also completely the same as in Example 1; that is, the quantum dot material layer is divided into a high-concentration quantum region 302 and a low-concentration quantum region 301, with the concentration of quantum dot material in the high-concentration quantum region 302 being relatively higher than that in the low-concentration quantum region 301; the junction of the high-concentration quantum region 302 and the low-concentration quantum region 301 is the transition region 303, and the concentration of quantum dot material in the transition region 303 increases linearly, that is, linearly from the low-concentration quantum region 301 to the high-concentration quantum region 302. The microprism diffusion plate 11 is made of a high-haze optical-grade polymer to ensure light uniformity.

[0038] Optical performance: The multi-zone optical quantum film excites white light with a wide color gamut coverage, significantly improving contrast in dynamic dimming mode, and the quantum film component has a high degree of integration.

[0039] Example 4

[0040] This embodiment further adds a dynamic control module to the structure of embodiment 1. The dynamic driving module is electrically connected to the backlight module in zones, specifically to the light-emitting chip 6 on the far-distance mixing zone 8, the light-emitting chip 6 on the near-distance mixing zone 9, and the light-emitting chip 6 at the mixing strip. Through independent dimming of each zone by the dynamic control module, the color gamut of the display device is widened, improving the image quality to adapt to different display scenarios. Simultaneously, image analysis algorithms can analyze image content in real time, dynamically adjusting the backlight strategy to optimize the balance between energy efficiency and image quality.

[0041] Example 5

[0042] This embodiment is basically the same as Embodiment 1, except that: the protrusion 7 of the backlight module is located in the middle of the back plate 4, the far-distance mixing area 8 surrounds the circumference of the near-distance mixing area 9, and the mixing band is located between the far-distance mixing area 8 and the near-distance mixing area 9. The distance between the light-emitting chips 6 in the mixing band gradually decreases from the edge to the center, forming a gradient mixing band; the high-concentration quantum area of ​​the quantum diffuser 3 is located in the middle of the low-concentration quantum area, and the low-concentration quantum area surrounds the circumference of the high-concentration quantum area. The high-concentration quantum area corresponds to the near-distance mixing area of ​​the backlight module, and the low-concentration quantum area corresponds to the far-distance mixing area; the concentration of quantum dot material in the high-concentration quantum area is higher than that in the low-concentration quantum area, and the intersection of the high-concentration quantum area and the low-concentration quantum area is the transition area. The concentration of quantum dot material in the transition area increases linearly, that is, it increases linearly from the low-concentration quantum area to the high-concentration quantum area, ensuring a more natural color gamut optimization. The rest is exactly the same as Embodiment 1; this method further enhances the light intensity of the central area and reduces the edge brightness attenuation.

[0043] Although the present invention has been described herein with reference to illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and improvements can be made to the components and / or layout of the subject matter combination within the scope of the present application. Besides variations and improvements to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. An ultrathin liquid crystal display device based on blue light COB and multi-zone quantum materials, characterized in that: The system includes a liquid crystal display panel (1), a composite optical film (2), and a quantum diffusion plate (3) bonded together in sequence. It also includes a backlight module, which includes a back plate (4), a reflective paper (5), and a light-emitting chip matrix composed of multiple light-emitting chips (6). The reflective paper (5) is bonded to the back plate (4), and the light-emitting chip matrix is ​​mounted on the surface of the reflective paper (5). The light-emitting chip matrix on the back plate (4) includes a near-distance mixing area (9) and a far-distance mixing area (8). The mixing distance of the near-distance mixing area (9) is smaller than that of the far-distance mixing area (8). The quantum diffusion plate (3) has a low-concentration quantum region (301) and a high-concentration quantum region (302). The concentration of quantum dot material in the low-concentration quantum region (301) is smaller than that in the high-concentration quantum region (302). The high-concentration quantum region (302) corresponds to the near-distance mixing area (9) of the backlight module, and the low-concentration quantum region (301) corresponds to the far-distance mixing area (8).

2. The ultrathin liquid crystal display device based on blue light COB and multi-zone quantum materials according to claim 1, characterized in that: The back plate (4) has a protrusion (7) running horizontally through the middle. The back plate (4) is divided into three areas, including a long-distance mixing area (8) at the upper end of the protrusion (7), a long-distance mixing area (8) at the lower end, and a short-distance mixing area (9) at the upper part of the protrusion (7). The quantum diffusion plate (3) is divided into three areas, including a low-concentration quantum area (301) at the upper end, a high-concentration quantum area (302) in the middle, and a low-concentration quantum area (301) at the lower end.

3. The ultrathin liquid crystal display device based on blue light COB and multi-zone quantum materials according to claim 1, characterized in that: The back plate (4) has a boss (7) in the middle and is divided into two regions, including a near-distance mixing region (9) on the boss (7) and a far-distance mixing region (8) surrounding the near-distance mixing region; the quantum diffusion plate (3) is divided into two regions, including a high-concentration quantum region (302) in the middle and a low-concentration quantum region (301) surrounding the high-concentration quantum region (302).

4. The ultrathin liquid crystal display device based on blue light COB and multi-zone quantum materials according to claim 2 or 3, characterized in that: The light-emitting chips (6) in the far-distance mixing zone (8) and the near-distance mixing zone (9) are blue COB light sources. The light-emitting chips (6) in the far-distance mixing zone (8) form a low-density dot matrix light source, and the light-emitting chips (6) in the near-distance mixing zone (9) form a high-density dot matrix light source.

5. The ultrathin liquid crystal display device based on blue light COB and multi-zone quantum materials according to claim 4, characterized in that: A gradient mixing zone is formed between the far-distance mixing zone (8) and the near-distance mixing zone (9), and the density of the light-emitting chip (6) in the mixing zone gradually increases from the far-distance mixing zone (8) to the near-distance mixing zone (9).

6. The ultrathin liquid crystal display device based on blue light COB and multi-zone quantum materials according to claim 5, characterized in that: The high-concentration quantum region (302) and the low-concentration quantum region (301) meet at the transition region (303), and the concentration of quantum dot material in the transition region (303) increases linearly from the low-concentration quantum region (301) to the high-concentration quantum region (302).

7. The ultrathin liquid crystal display device based on blue light COB and multi-zone quantum materials according to claim 6, characterized in that: The quantum diffusion plate (3) is made of polymer substrate, quantum dot material and diffusion particles through injection molding process.

8. The ultrathin liquid crystal display device based on blue light COB and multi-zone quantum materials according to claim 6, characterized in that: The quantum diffusion plate (3) has a layered structure, including a microprism diffusion plate (11), a quantum dot material layer and a diffusion film. The quantum dot material is coated on the microprism diffusion plate (11) in sections using high-precision printing technology, and the diffusion film is attached to the side of the microprism diffusion plate (11) coated with quantum dot material.

9. The ultrathin liquid crystal display device based on blue light COB and multi-zone quantum materials according to claim 6, characterized in that: In the far-distance mixing zone (8) of the backlight module, the size of the light-emitting chip (6) that makes up the light-emitting chip matrix is ​​larger than the size of the light-emitting chip (6) in the near-distance mixing zone (9), and the light emission angle of the light-emitting chip (6) in the far-distance mixing zone (8) is wider than the light emission angle of the light-emitting chip (6) in the near-distance mixing zone (9).

10. The ultrathin liquid crystal display device based on blue light COB and multi-zone quantum materials according to claim 9, characterized in that: The light-emitting chip (6) on the far-distance mixing zone (8), the light-emitting chip (6) on the near-distance mixing zone (9), and the light-emitting chip (6) at the mixing zone are electrically connected to the dynamic control module.

Images