An ultra-thin and high-brightness light guide plate

Abstract

This application relates to the field of light guide plates, and particularly to an ultra-thin and high-brightness light guide plate. The ultra-thin and high-brightness light guide plate includes a light guide plate body, the light guide plate body includes a light incident surface, a light exit surface and a reflection surface, the reflection surface is opposite to the light exit surface, and a plurality of dots are provided on the reflection surface; a first area located in the BM light-shielding area and adjacent to the light incident surface is provided on the light exit surface, and a plurality of first prism ridges extending in a direction perpendicular to the light incident surface are provided in the first area. The present application has the following effects: 1. The light guide plate is not likely to cause phenomena such as bright edges on the light incident surface and hotspot defects in the manufactured backlight unit; 2. The amount of light emitted from the light guide plate body in the VA viewing area is increased, and the overall brightness of the light guide plate is improved; 3. The light shielding performance and wear resistance of the light guide plate are improved; 4. It is beneficial to the development of the light guide plate towards ultra-thinness.

Description

Technical Field

[0001] The present application relates to the field of light guide plates, and more particularly to an ultra-thin high-brightness light guide plate. Background Art

[0002] Currently, liquid crystal display devices are usually not self-luminous devices, so a backlight unit needs to be provided. The backlight unit mainly consists of a light source and a light guide plate that guides the light emitted from the light source to make it emit light in a surface manner.

[0003] The backlight unit is classified into a direct-lit type and a side-light type according to the position of the light source. The direct-lit type means that the light source is arranged directly below the light guide plate. The side-light type means that the light source is arranged at the side end of the light guide plate. Figure 1 shows a backlight unit manufactured by the side-light type. Liquid crystal display devices usually have a VA viewing area 100 and a BM light-shielding area 400. The VA viewing area 100 refers to the area that can be seen by the liquid crystal display device, and the BM light-shielding area 400 refers to the area where the light is blocked near the edge part of the liquid crystal display device.

[0004] In addition, the light source is usually an LED light source. The LED is a point light source, and its light-emitting state is fan-shaped emission with a certain light-emitting angle. Multiple LEDs are arranged at a certain interval to form an LED light bar. The light emitted by each LED will present a bright area on the light-incident side of the light guide plate, and the part between two LEDs will present a dark area. The bright and dark areas are mixed alternately to form light-emitting areas with different brightnesses, alternating between light and dark. This phenomenon is called hotspot.

[0005] The hotspot phenomenon in the existing backlight unit is mainly related to the A and P values. The A value refers to the distance between the light source and the edge of the VA viewing area, and the P value refers to the distance between two adjacent LEDs. The larger the A value, the farther the hotspot is from the VA viewing area, and the smaller the probability of hotspot defects. The smaller the P value, the farther the hotspot area, and the smaller the probability of hotspot defects. In order to evaluate the hotspot defect risk, another parameter ratio A / P value is introduced. When the A / P value of a small and medium-sized backlight unit ≥ 0.8, it is considered that the hotspot defect risk is controllable. Currently, in product design, in order to pursue narrow borders, low power consumption, and low cost, the design trend is to make the P value large (reduction of LED particles) and the A value small (large effective light-emitting area), that is, to develop towards an A / P value ≤ 0.4. For backlight units with an A / P value ≤ 0.4, hotspot defects are extremely likely to occur and need to be solved urgently.

[0006] Regarding the above related technologies, the inventor believes that there is a defect that backlight units with too small A / P values are prone to hotspot defects. Summary of the Invention

[0007] In order to reduce the occurrence of hotspot defects in the backlight unit with too small A / P value, the present application provides an ultra-thin and high-brightness light guide plate.

[0008] The ultra-thin and high-brightness light guide plate provided by the present application adopts the following technical solutions:

[0009] An ultra-thin and high-brightness light guide plate includes a light guide plate body. The light guide plate body includes a light incident surface, a light emitting surface, and a reflecting surface. The reflecting surface is opposite to the light emitting surface, and a plurality of light dots are provided on the reflecting surface; a first area located in the BM light-shielding area and adjacent to the light incident surface is provided on the light emitting surface, and a plurality of first prism ridges extending in a direction perpendicular to the light incident surface are provided in the first area.

[0010] By adopting the above technical solutions, the first prism ridges provided in the first area on the light emitting surface can reflect, refract, and diffusely reflect the light emitted from the light incident surface, and can mix the light at multiple angles, so that the light entering the light guide plate body is relatively uniform, and thus the light guide plate is not likely to cause hotspot defects in the manufactured backlight unit. At the same time, the first area is located in the BM light-shielding area, and the first prism ridges can reflect, refract, and diffusely reflect the light that would originally be emitted from the first area to other propagation areas of the light guide plate body, reducing the light emitted from the light emitting surface of the first area, thus solving the problem of the bright edge of the light incident surface, and increasing the amount of light emitted from the VA viewing area of the light guide plate body, improving the overall brightness of the light guide plate.

[0011] Optionally, the length of the first area in the direction perpendicular to the light incident surface is L1, and the ratio of L1 to the A value satisfies: 0.3 ≤ L1 / A ≤ 0.5.

[0012] By adopting the above technical solutions, the length of the first area is not likely to be too long or too short, resulting in hotspot defects or bright light on the light incident surface, etc., and the light emitted by the light guide plate is relatively uniform.

[0013] Optionally, the height of the first prism ridges is 3-7 μm.

[0014] By adopting the above technical solutions, when the depth of the first prism ridges is too shallow, it cannot achieve good reflection, refraction, and diffuse reflection effects, so that bright edges on the light incident surface and hotspot defects may still occur on the light incident surface of the light guide plate body. When the height of the first prism ridges is too high, the refraction and diffuse reflection are too strong, so that a large amount of light may still be emitted from the first area, resulting in bright edges on the light incident surface and hotspot defects, etc. By setting the height of the first prism ridges to 3-7 μm, the problems of bright edges on the light incident surface and hotspot defects, etc. can be better solved.

[0015] Optionally, the height of the first prism ridges is continuously 7 μm.

[0016] By adopting the above technical solution, by setting the height of the first prism convex rib to a continuous 7 μm, the reflection, refraction and diffuse reflection generated by the first prism convex rib make it difficult for the light guide plate body to generate problems such as bright edges on the light incident surface and hotspot defects.

[0017] Optionally, a second area and a third area are provided on the light exit surface, and the second area is located between the first area and the third area;

[0018] The second area is located in the BM light shielding area, and the second area is a plane;

[0019] A plurality of second prism convex ribs extending in a direction perpendicular to the light incident surface are provided in the third area.

[0020] By adopting the above technical solution, by setting the second area as a plane, it is beneficial to conduct the light incident into the second area to the part in the VA viewing area in the third area, and prevent the formation of bright edges in the BM light shielding area.

[0021] Optionally, the height of the second prism convex rib increases stepwise or linearly from the end close to the light incident surface to the end far from the light incident surface.

[0022] By adopting the above technical solution, by increasing the height of the second prism convex rib far from the light incident surface, the light refracted by the second prism convex rib can irradiate the VA viewing area more comprehensively, reducing light loss and improving the brightness of the light guide plate. At the same time, since the second prism convex rib can increase the scattering and refraction of the incident light, the light shielding performance of the light guide plate is improved.

[0023] Optionally, the height of the second prism convex rib increases linearly from 0 - 25 μm.

[0024] By adopting the above technical solution, the light guide plate can make the light emit more concentratedly from the VA viewing area, improving the light utilization rate and increasing the brightness of the light guide plate. At the same time, the light shielding performance of the light guide plate is improved.

[0025] Optionally, the length of the second area in the direction perpendicular to the light incident surface is L2, and the ratio of L2 to the distance A from the light source to the edge of the VA viewing area satisfies: 0.1 ≤ L2 / A ≤ 0.3.

[0026] By adopting the above technical solution, the length of the second area is not likely to be too long or too short, resulting in problems such as hotspot defects or bright light on the light incident surface, and the light emitted by the light guide plate is relatively uniform.

[0027] Optionally, a wedge-shaped portion extends from the light incident surface of the light guide plate body, and a new light incident surface is formed on the side surface of the wedge-shaped portion;

[0028] The thickness of the wedge-shaped portion decreases linearly from the light incident surface to the direction of the light guide plate body;

[0029] The distance between the connection of the wedge part and the light guide plate body and the edge of the VA viewing area is defined as A1, and 0.3 ≤ L1 / A1 ≤ 0.5;

[0030] and / or;

[0031] 0.1 ≤ L2 / A1 ≤ 0.3.

[0032] By adopting the above technical solution, since the thickness of the wedge part decreases linearly from the light incident surface to the direction of the light guide plate body, the new light incident surface formed by the wedge part has a larger area than the old light incident surface. Therefore, under the condition of receiving the same amount of light, the light guide plate body with the wedge part has a lower thickness than the light guide plate body without the wedge part, which is beneficial to the development of the light guide plate towards ultra-thinness.

[0033] At the same time, by making the value of the parameter ratio L1 / A1 satisfy 0.3 ≤ L1 / A1 ≤ 0.5 and the value of the parameter ratio L2 / A1 satisfy 0.1 ≤ L2 / A1 ≤ 0.3, the risk of the light guide plate having hotspot and bright edge defects can be reduced.

[0034] Optionally, the light guide dots are concave from the reflection surface towards the light emitting surface. The light guide dots have a light incident end face for receiving light and a dot backlight face away from the light incident surface, and the area of the light incident end face is larger than the area of the dot backlight face.

[0035] By adopting the above technical solution, the light incident area of the light guide dots is increased, and thus more light is refracted, improving the light utilization rate and the brightness of the light guide plate.

[0036] Optionally, the light guide dots are irregular quadrangular pyramid-shaped grooves, the light incident end face is a plane, the included angle between the light incident end face and the dot backlight face is 100 degrees - 120 degrees, and the included angle between the light incident end face and the reflection surface is 10 degrees - 20 degrees;

[0037] and / or;

[0038] The reflection surface is provided with a plurality of convex points.

[0039] By adopting the above technical solution, the light emitting angle α of the refracted light is smaller and the light directivity is enhanced, improving the light utilization rate and thus enhancing the brightness of the light guide plate. In addition, if only concave light guide dots are provided on the reflection surface of the light guide plate, the reflection surface of the light guide plate will directly contact the reflection sheet. At this time, static electricity will be generated due to friction between the light guide plate and the reflection sheet, and foreign matters will be adsorbed, causing defects such as white spots or white dots. By compensating a small amount of convex points on the reflection surface, the defects of white spots or white dots can be improved.

[0040] In summary, the present application includes at least one of the following beneficial technical effects:

[0041] 1. The light guide plate is not likely to cause problems such as bright edges on the light incident surface and hotspot defects in the manufactured backlight unit;

[0042] 2. The amount of light emitted from the light guide plate body in the VA viewing area is increased, improving the overall brightness of the light guide plate;

[0043] 3. The light shielding performance of the light guide plate is improved;

[0044] 4. It is conducive to the development of the light guide plate towards ultra-thinness. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a schematic structural diagram of a liquid crystal display device in the related art of the present application.

[0046] Figure 2 is a side view of the connection between the ultra-thin high-brightness light guide plate and the light source in Embodiment 1 of the present application.

[0047] Figure 3 is a schematic structural diagram of the ultra-thin high-brightness light guide plate in Embodiment 1 of the present application to highlight the reflective surface.

[0048] Figure 4 is Figure 3 a schematic structural diagram of the ultra-thin high-brightness light guide plate to highlight the light-emitting surface.

[0049] Figure 5 is Figure 4 an enlarged schematic structural diagram of part A in

[0050] Figure 6 is a processing schematic diagram of the second prism convex rib of the ultra-thin high-brightness light guide plate in Embodiment 1 of the present application.

[0051] Figure 7 is a schematic structural diagram of the ultra-thin high-brightness light guide plate in Embodiment 2 of the present application to highlight the light-emitting surface.

[0052] Figure 8 is Figure 7 a front view of the ultra-thin high-brightness light guide plate marking the VA viewing area.

[0053] Figure 9 is a partial side view of the ultra-thin high-brightness light guide plate in Embodiment 3 of the present application.

[0054] Figure 10 is a partial side view of the ultra-thin high-brightness light guide plate in Embodiment 4 of the present application to highlight the light guide dots.

[0055] Figure 11 is a cross-sectional view of the light guide dots in the light guide plate of the related art of the present application.

[0056] Figure 12It is a schematic structural diagram of the dot matrix in Embodiment 5 of the present application.

[0057] Figure 13 It is a partial side view of the ultra-thin high-brightness light guide plate in Embodiment 5 of the present application to highlight the dot matrix.

[0058] Figure 14 It is a schematic connection diagram of the ultra-thin high-brightness light guide plate and the reflective sheet in Embodiment 6 of the present application.

[0059] Explanation of reference numerals: 1, light guide plate body; 11, light incident surface; 12, light exit surface; 121, first area; 122, second area; 123, third area; 13, reflective surface; 2, first prism convex rib; 21, first prism groove; 3, second prism convex rib; 31, second prism groove; 4, dot matrix; 41, light incident end face; 42, backlight surface of the dot matrix; 5, wedge part; 51, light guide surface; 6, processing table; 7, processing tool; 8, bump; 100, VA viewing area; 200, light source; 300, light guide plate; 400, BM light-shielding area; 500, reflective sheet. Detailed implementation manners

[0060] The following further elaborates on the present application in conjunction with the attached Figures 1-14 drawings.

[0061] Referring to Figure 1 , in the existing liquid crystal display device, there are an LED light source 200 and a light guide plate 300 inside, and the LED light source 200 is located on the side of the light guide plate 300. The liquid crystal display device has a VA viewing area 100 and a BM light-shielding area 400. The VA viewing area 100 refers to the area visible in the liquid crystal display device, and the BM light-shielding area 400 refers to the area where the light is blocked near the edge of the liquid crystal display device.

[0062] Embodiment 1 of the present application discloses an ultra-thin high-brightness light guide plate, which is an improvement based on the above-mentioned related light guide plate 300.

[0063] Embodiment 1:

[0064] Referring to Figure 2 , the ultra-thin high-brightness light guide plate includes a light guide plate body 1, and the light guide plate body 1 includes a light incident surface 11, a light exit surface 12 and a reflective surface 13. The light incident surface 11 and the light exit surface 12 are perpendicular to each other, and the reflective surface 13 is opposite to the light exit surface 12. Referring to Figure 2 and Figure 3 , a plurality of dot matrices 4 are provided on the reflective surface 13, and the dot matrices 4 can make the light source 200 enter and form multi-angle reflections, and then exit from the light exit surface 12.

[0065] Referring to Figure 4, on the light-emitting surface 12, there is a first area 121 located in the above-mentioned BM light-shielding area 400, and the first area 121 is arranged in the area where the light-emitting surface 12 is adjacent to the light-incident surface 11. The first area 121 is provided with a plurality of first prism ridges 2 extending in a direction perpendicular to the light-incident surface 11 and arranged in parallel side by side. Refer to Figure 5 , the first prism ridges 2 are formed by processing a number of parallel side-by-side first prism grooves 21 on the light guide plate body 1, and a first prism ridge 2 is formed between two adjacent first prism grooves 21. The cross-section of the first prism ridge 2 is arc-shaped. In this embodiment, the radian of the first prism ridge 2 is specifically 50 rad. The plurality of first prism ridges 2 arranged in parallel side by side form an R-cut structure. At the same time, the height of the first prism ridge 2 is in the range of 3 μm to 7 μm, and the height of the first prism ridge 2 is the distance from the lowest point to the highest point of the first prism ridge 2. In this embodiment, the height of the first prism ridge 2 is specifically 7 μm.

[0066] By providing the first prism ridges 2, when light irradiates on the first prism ridges 2, it can change the propagation and reflection direction of the light, producing a light mixing effect, so that the light guide plate 300 is not likely to cause the hotspot defect in the manufactured backlight unit. And by controlling the depth of the first prism ridges 2, the area on the light-incident side of the first prism ridges 2 can be increased, so that the amount of light propagating and reflecting toward the light-emitting surface 12 changes. The first prism ridges 2 can refract and diffusely reflect the light that would originally be emitted from the first area 121 to other propagation areas of the light guide plate body 1, and finally be emitted from the part of the light guide plate body 1 within the VA viewing area 100, thereby increasing the amount of light emitted from the light guide plate body 1 from the VA viewing area 100 and improving the overall brightness of the light guide plate 300.

[0067] In addition, refer to Figure 1 and Figure 4, the distance from the light source 200 to the edge of the VA viewing area 100 can be obtained as A above. The larger the value of A, the farther the hotspot is from the VA viewing area 100, and the smaller the probability of hotspot defects. The smaller the value of A, the closer the hotspot is to the VA viewing area 100, and the greater the probability of hotspot defects. The length of the first area 121 in the direction perpendicular to the light incident surface 11 is defined as L1. The smaller L1 is, the weaker the reflection, refraction, and scattering capabilities of the first area 121. When the reflection, refraction, and scattering capabilities are too weak, the hotspot defect phenomenon is still difficult to solve. The larger L1 is, the stronger the reflection, refraction, and scattering capabilities of the first area 121, and at the same time, the first area 121 is closer to the VA viewing area 100. Since the first prism ridge 2 of the first area 121 will partially reflect the received light to other areas of the light guide plate body 1, and at the same time will deflect part of the light from the first area 121 towards the VA viewing area 100 and emit it. When the distance between the first area 121 and the VA viewing area 100 is appropriate, the light rays deflected towards the VA viewing area 100 emitted from the first area 121 will be blocked by the BM light-shielding area 400. However, when the first area 121 is too close to the VA viewing area 100, the light rays deflected towards the VA viewing area 100 emitted from the first area 121 are likely to emit from the edge of the VA viewing area 100 and the BM light-shielding area 400. At this time, the defect of the bright edge on the light incident surface 11 will occur. Therefore, another parameter ratio L1 / A value is introduced. When 0.3 ≤ L1 / A ≤ 0.5, it is considered that the risks of hotspot defects and bright edges on the light incident surface are controllable. In this embodiment, L1 / A is 0.4, that is, L1 is 2 / 5A. At this time, the risk of hotspot defects in the light guide plate 300 is small.

[0068] Referring to Figure 4 , a second area 122 adjacent to the first area 121 and a third area 123 adjacent to the second area 122 are further provided on the light emitting surface 12, that is, the second area 122 is located between the first area 121 and the third area 123. The second area 122 is located in the BM light-shielding area 400 and is a smooth plane.

[0069] In addition, referring to Figure 1 and Figure 4 , the length of the second area 122 in the direction perpendicular to the light incident surface 11 is defined as L2. When the value of A is fixed, when the value of L2 is too large, the value of L1 is small. As known above, the smaller L1 is, the weaker the reflection, refraction, and scattering capabilities of the first area 121. At this time, the hotspot defect phenomenon is still difficult to solve. When the value of L2 is too small, the value of L1 is too large. As can be obtained above, the defect of the bright edge on the light incident surface is likely to occur at this time. Therefore, another parameter ratio L2 / A value is introduced. When 0.1 ≤ L2 / A ≤ 0.3, it is considered that the risks of hotspot defects and bright edges on the light incident surface are controllable. In this embodiment, L1 / A is 0.2, that is, L2 is 1 / 5A. At this time, the risks of hotspot defects and bright edges on the light incident surface in the light guide plate 300 are small.

[0070] In the third region 123, a plurality of second prism ridges 3 are provided which extend in a direction perpendicular to the light incident surface 11 and are arranged in parallel side by side. The cross-section of the second prism ridge 3 is arc-shaped. In this embodiment, the radian of the second prism ridge 3 is specifically 80 rad. The plurality of second prism ridges 3 form an R-cut structure. A partial region of the third region 123 close to the second region 122 is located in the BM light-shielding region 400. The length of the third region 123 on the light incident surface 11 perpendicular to the light incident surface 11 and located within the BM light-shielding region 400 remains unchanged. At the same time, most of the third region 123 is in the VA viewing region 100.

[0071] Referring to Figure 2 , the height of the second prism ridge 3 increases linearly from the end close to the light incident surface 11 to the end far from the light incident surface 11. In this embodiment, the height of the second prism ridge 3 increases linearly from 0 - 25 μm. That is, the height of the end of the second prism ridge 3 closest to the light incident surface 11 is 0 μm, and the height of the end farthest from the light incident surface 11 is 25 μm. Referring to Figure 5 , the second prism ridge 3 is formed by processing a plurality of second prism grooves 31 arranged in parallel side by side. A second prism ridge 3 is formed between two adjacent second prism grooves 31. The following describes the processing method of a second prism groove 31. Referring to Figure 6 , the height difference between the two ends of the processing table 6 region opposite to the second region 122 region is defined as H1. When processing the second prism ridge 3, the light guide plate body 1 to be processed can be placed on the processing table 6 until the height of the part of the processing table 6 opposite to the end of the second region 122 region far from the light exit surface 12 is higher than the height of the part of the second region 122 region close to the light exit surface 12, and at the same time, make H1 be 25 μm. Then keep the height of the processing tool 7 unchanged, and make the processing tool 7 move along the length direction of the second prism ridge 3. Thus, a second prism groove 31 with a linear increase from 0 μm to 25 μm can be processed on the light guide plate body 1 by the processing tool 7. By processing a plurality of second prism grooves 31 arranged side by side in this way, a second prism ridge 3 with a height linearly increasing from 0 - 25 μm is formed between two adjacent second prism grooves 31.

[0072] Embodiment 2:

[0073] The difference between this embodiment and Embodiment 1 is that, referring to Figure 7, a wedge-shaped portion 5 extends from the light incident surface 11 of the light guide plate body 1. At this time, a new light incident surface 11 is formed on the side surface of the wedge-shaped portion 5. The wedge-shaped portion 5 is integrally formed with the light guide plate body 1, and the thickness of the wedge-shaped portion 5 decreases linearly from the light incident surface 11 towards the light guide plate body 1. The wedge-shaped portion 5 has opposite light guiding surfaces 51 and a reflecting surface 13, and the reflecting surface 13 of the wedge-shaped portion 5 and the reflecting surface 13 of the light guide plate body 1 form a new reflecting surface 13. The light guiding surface 51 is a smooth plane, and the light guiding ability of the wedge-shaped portion 5 is relatively strong. Thus, the light rays incident from the light incident surface 11 of the wedge-shaped portion 5 will directly enter the interior of the light guide plate body 1.

[0074] Referring to Figure 8 , the distance between the connection portion of the wedge-shaped portion 5 and the light guide plate body 1 and the edge of the VA viewing area 100 is defined as A1. At this time, the parameter ratio of the length L1 of the first area 121 in the direction perpendicular to the light incident surface 11 to A1 can also reflect the risk of hotspot defect. Therefore, another parameter ratio L1 / A1 value is introduced. When 0.3 ≤ L1 / A1 ≤ 0.5, it is considered that the risk of hotspot defect is controllable. In this embodiment, L1 / A1 is 0.4, that is, L1 is 2 / 5A1. At this time, the risk of the light guide plate 300 having a hotspot defect is relatively small.

[0075] Meanwhile, the parameter ratio of the length L2 of the second area 122 in the direction perpendicular to the light incident surface 11 to A1 can also reflect the risk of bright edge defect. Therefore, another parameter ratio L2 / A1 value is introduced. When 0.1 ≤ L2 / A1 ≤ 0.3, it is considered that the risk of bright edge defect is controllable. In this embodiment, L1 / A1 is 0.2, that is, L2 is 1 / 5A1. At this time, the risk of the light guide plate 300 having a bright edge defect is relatively small.

[0076] The implementation principle of Embodiment 2 of this application is as follows: Since the thickness of the wedge-shaped portion 5 decreases linearly from the light incident surface 11 towards the light guide plate body 1, the new light incident surface 11 formed by the wedge-shaped portion 5 has a larger area than the old light incident surface 11. Therefore, under the condition of receiving the same amount of light, the light guide plate body 1 with the wedge-shaped portion 5 has a lower thickness than the light guide plate body 1 without the wedge-shaped portion 5, which is beneficial to the development of the light guide plate 300 towards ultra-thinness.

[0077] At the same time, by making the value of the parameter ratio L1 / A1 satisfy 0.3 ≤ L1 / A1 ≤ 0.5 and the value of the parameter ratio L2 / A1 satisfy 0.1 ≤ L2 / A1 ≤ 0.3, the risks of the light guide plate 300 having hotspot defects and bright edge defects can be relatively small.

[0078] Embodiment 3:

[0079] The difference between this embodiment and Embodiment 1 is that, referring to Figure 9, the height of the second prism convex rib 3 increases step by step from the end close to the light incident surface 11 to the end far from the light incident surface 11. That is, for a single second prism convex rib 3, the second prism convex rib 3 will be divided into several segments along the length direction, and the height of each segment is the same, but the height of different segments increases in sequence from the end close to the light incident surface 11 to the end far from the light incident surface 11, with a fixed height increase each time. At the same time, the minimum height is 0 μm and the maximum height is 25 μm. In this embodiment, a single second prism convex rib 3 is divided into 25 segments in total, and the height of each segment increases by 1 μm on the basis of the previous segment, so that the height of the segment closest to the light incident surface 11 is 25 μm, and the height of the segment farthest from the light incident surface 11 is 0 μm. Refer to Figure 5 , during processing, by machining a plurality of second prism grooves 31 with depths increasing step by step from the end close to the light incident surface 11 to the end far from the light incident surface 11, the above-mentioned second prism convex rib 3 can be formed.

[0080] The implementation principle of Embodiment 3 of this application is: by increasing the height of the second prism convex rib 3 far from the light incident surface 11, the light refracted by the second prism convex rib 3 can irradiate the VA viewing area 100 more comprehensively, reducing light loss and improving the brightness of the light guide plate 300. At the same time, since the second prism convex rib 3 can increase the scattering, refraction, and diffuse reflection of the incident light, the light shielding performance of the light guide plate 300 is improved.

[0081] Embodiment 4:

[0082] The difference between this embodiment and Embodiment 1 lies in the different structures of the light dots 4. Refer to Figure 10 , the light dot 4 is a concave light dot 4, the light dot 4 has a light incident end face 41 for receiving light and a light dot backlight face 42 far from the light incident surface 11, and the area of the light incident end face 41 is larger than that of the light dot backlight face 42. In this embodiment, the cross section of the light dot 4 is in a shape similar to a water droplet, and at the same time, the radian of the light incident end face 41 is smaller than that of the light dot backlight face 42.

[0083] Refer to Figure 10 and Figure 11, the dot 4 in the related art is usually a convex dot 4 and has a symmetric arc structure. Therefore, compared with the dot 4 disclosed in this embodiment, under the condition that the depth of the dot 4 in the related art is the same as that of the dot 4 in this embodiment, the light incident area of the dot 4 disclosed in this embodiment is larger, and thus more light is refracted. The angle between the light refracted by the dot 4 and the light-emitting surface 12 is defined as the light-emitting angle α. The radian of the light-incident end face 41 of the dot 4 in this embodiment is smaller than the radian of the light-incident end face 41 of the dot 4 in the related art. Therefore, the light-emitting angle α of the light finally refracted by the light incident on the light-incident end face 41 of the dot 4 in this embodiment is smaller. Therefore, the amount of light finally incident on the VA viewing area 100 through the light-incident end face 41 of the dot 4 in this embodiment increases, the light utilization rate is improved, and the brightness of the light guide plate is further enhanced. After testing, the brightness is effectively increased by 7%-10%.

[0084] Finally, the dot 4 in this embodiment can also be applied to the reflection surface 13 of the light guide plate body 1 disclosed in Embodiment 2 or Embodiment 3.

[0085] Embodiment 5:

[0086] The difference between this embodiment and Embodiment 4 is that, referring to Figure 12 , the dot 4 is an irregular quadrangular pyramid groove, referring to Figure 13 , the angle between the light-incident end face 41 and the dot backlight face 42 is β1, and β1 is 100 degrees - 120 degrees. The angle between the light-incident end face 41 and the reflection surface 13 is β2, and β2 is 10 degrees - 20 degrees.

[0087] Referring to Figure 11 and Figure 13 , the light-incident end face 41 of the dot 4 disclosed in this embodiment is a plane. Therefore, the scattering of the light-incident end face 41 of the dot 4 disclosed in this embodiment is smaller than that of the dot 4 in the related art, and the directivity of the finally emitted light is enhanced, and it can point to the VA viewing area 100 more accurately. In addition, by setting β1 to 100 degrees - 120 degrees and β2 to 10 degrees - 20 degrees, the light-emitting angle α of the finally refracted light is smaller, the light utilization rate is improved, and the brightness of the light guide plate 300 is further enhanced. After testing, the brightness is effectively increased by 7%-10%.

[0088] Finally, the dot 4 disclosed in this embodiment can also be applied to the reflection surface 13 of the light guide plate body 1 disclosed in Embodiment 2 or Embodiment 3.

[0089] Embodiment 6:

[0090] The difference between this embodiment and Embodiment 5 is that, referring to Figure 14, the reflecting surface 13 is further provided with a plurality of convex points 8, which protrude from the reflecting surface 13 in a direction away from the light-emitting surface 12, and the cross-section of the convex points 8 is arc-shaped. The convex points 8 on the reflecting surface 13 can be manufactured by means of laser, mechanical bumping and sandblasting. In the backlight unit in the related art, a reflector 500 is usually disposed below the light guide plate 300. If only the concave-shaped dot patterns 4 are provided on the reflecting surface 13 of the light guide plate 300, the reflecting surface 13 of the light guide plate 300 will directly contact the reflector 500. At this time, static electricity will be generated due to friction between the light guide plate 300 and the reflector 500, and foreign matters will be adsorbed, resulting in defective phenomena such as white spots or white dots. By compensating a small amount of convex points 8 on the reflecting surface 13, the defective phenomena of white spots or white dots can be improved.

[0091] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An ultra-thin high-brightness light guide plate, comprising a light guide plate body (1), the light guide plate body (1) including a light incident surface (11), a light exit surface (12) and a reflection surface (13), the light incident surface (11) and the light exit surface (12) being perpendicular to each other, the reflection surface (13) being opposite to the light exit surface (12), and a plurality of dot patterns (4) being provided on the reflection surface (13); characterized in that: On the light-emitting surface (12), there is a first region (121) located in the BM light-shielding region (400) and adjacent to the light-incident surface (11). The first region (121) is provided with a plurality of first prism ridges (2) extending in a direction perpendicular to the light-incident surface (11). The length of the first region (121) in the direction perpendicular to the light-incident surface (11) is L1, and the ratio of L1 to the A value satisfies: 0.3 ≤ L1 / A ≤ 0.

5. On the light-emitting surface (12), there are a second region (122) and a third region (123). The second region (122) is located between the first region (121) and the third region (123); The second region (122) is located in the BM light-shielding region (400), and the second region (122) is a plane. The length of the second region (122) in the direction perpendicular to the light-incident surface (11) is L2, and the ratio of L2 to the A value satisfies: 0.1 ≤ L2 / A ≤ 0.

3. The A value refers to the distance between the light source and the edge of the VA viewing area.

2. The ultra-thin high-brightness light guide plate according to claim 1, wherein: The height of the first prism ridge (2) is 3 - 7 μm.

3. The ultra-thin high-brightness light guide plate according to any one of claims 1 to 2, characterized in that: The third region (123) is provided with a plurality of second prism ridges (3) extending in a direction perpendicular to the light-incident surface (11).

4. The ultra-thin high-brightness light guide plate according to claim 3, wherein: The height of the second prism ridge (3) increases stepwise or linearly from the end close to the light-incident surface (11) to the end far from the light-incident surface (11).

5. The ultra-thin high-brightness light guide plate according to claim 4, wherein: The height of the second prism ridge (3) increases linearly from 0 - 25 μm.

6. The ultra-thin high-brightness light guide plate according to claim 5, wherein: A wedge-shaped portion (5) extends from the light-incident surface (11) of the light guide plate body (1), and a new light-incident surface (11) is formed on the side surface of the wedge-shaped portion (5); The thickness of the wedge-shaped portion (5) decreases linearly from the light-incident surface (11) towards the light guide plate body (1); The distance between the connection of the wedge-shaped portion (5) and the light guide plate body (1) and the edge of the VA viewing area (100) is defined as A1, and 0.3 ≤ L1 / A1 ≤ 0.5; and / or; 0.1 ≤ L2 / A1 ≤ 0.

3.

7. The ultra-thin high-brightness light guide plate according to claim 1, wherein: The light dots (4) are concave from the reflecting surface (13) into the light-emitting surface (12). The light dots (4) have a light-incident end face (41) for receiving light and a light dot backlight face (42) far from the light-incident surface (11). The area of the light-incident end face (41) is larger than the area of the light dot backlight face (42).

8. The ultra-thin high-brightness light guide plate according to claim 7, characterized in that: The light dots (4) are irregular quadrangular pyramid-shaped grooves. The light-incident end face (41) is a plane. The included angle between the light-incident end face (41) and the light dot backlight face (42) is 100 degrees - 120 degrees. The included angle between the light-incident end face (41) and the reflecting surface (13) is 10 degrees - 20 degrees; and / or; The reflecting surface (13) is provided with a plurality of convex points (8).

Images