A high-brightness and high-coverage light guide plate

Abstract

This application relates to the field of production and processing of light guide plates, and particularly to a novel high-brightness and high-concealment light guide plate, which includes a light guide plate body. An incident light side and an outgoing light side are provided at both ends of the light guide plate body in the length direction. Reflective surfaces and outgoing light surfaces are respectively provided on both side surfaces of the light guide plate body in the thickness direction. A plurality of first cutting grooves are provided on the reflective surface, and the plurality of first cutting grooves are arranged parallel to the incident direction of the light source. A plurality of second cutting grooves are all arranged perpendicular to the incident direction of the light source. The second cutting grooves are non-isosceles V-shaped grooves, and vertices are formed by connecting between adjacent two second cutting grooves, and the vertices remain unchanged. The plurality of first cutting grooves and the plurality of second cutting grooves are arranged in an alternating manner to form a plurality of free curved surfaces protruding outward. A plurality of third cutting grooves are provided on the surface of the outgoing light surface. This application can enable light to be reasonably distributed in the effective viewing area, improve the outgoing brightness of the light, so as to improve the light energy utilization rate, and improve the concealment of white dots or small defects.

Description

Technical Field

[0001] The present application relates to the field of production and processing of light guide plates, and particularly to a high-brightness and high-concealment light guide plate. Background Art

[0002] Backlight modules are widely used in various electronic devices or display devices. Among them, the light guide plate is mainly used to effectively conduct and distribute light to form a surface light source, which is an indispensable core component of the backlight module. The properties of the light guide plate can largely determine the brightness and light output efficiency of the backlight module.

[0003] In the conventional design of the light guide plate, a plurality of dots are arranged on the reflecting surface, and a plurality of arc-shaped protrusions are arranged on the light-emitting surface. When light enters the light guide plate from the light-incident side and is conducted to each dot, it will destroy the total reflection path of the incident light and emit through the light-emitting surface of the light guide plate to form a surface light source.

[0004] Regarding the above related technologies, the inventor believes that during the process of light conduction in the light guide plate, the light source light forms diffuse reflection or scattering in multiple directions through the dots and reaches the light-emitting surface, and the arc-shaped protrusions on the light-emitting surface refract the light. During this conduction process, the angle of diffuse reflection or scattering formed by the light source light is relatively large, making it difficult to utilize the light source light within the effective viewing area. In this way, the light energy loss of the light guide plate is relatively large. At the same time, when there are small defects or white dots in the light guide plate due to processing, it is difficult to cover up these small defects or white dots with such a setting. Summary of the Invention

[0005] In order to effectively utilize the light source light within the effective viewing area to improve the light energy utilization rate and also improve the concealment property, the present application provides a new type of high-brightness and high-concealment light guide plate.

[0006] The present application provides a new type of concealment light guide plate, adopting the following technical solutions:

[0007] A high-brightness and high-concealment light guide plate includes a light guide plate body. At both ends of the light guide plate body in the length direction, a light-incident side and a light-emitting side are provided. On both surfaces of the light guide plate body in the thickness direction, a reflecting surface and a light-emitting surface are respectively provided. A plurality of first cut grooves and a plurality of second cut grooves are arranged on the reflecting surface. The plurality of first cut grooves are arranged parallel to the light source incident direction, and the plurality of second cut grooves are all arranged perpendicular to the light source incident direction. The second cut grooves are non-isosceles V-shaped grooves. The plurality of first cut grooves and the plurality of second cut grooves are arranged in a crisscross pattern to form a plurality of outwardly protruding free-form surfaces. The light-emitting surface forms a plurality of light-emitting curved surfaces through a plurality of third cut grooves.

[0008] By adopting the above technical solution, a first cut groove and a second cut groove are added to the reflecting surface. The first cut groove and the second cut groove are arranged in a criss-cross pattern to form a plurality of free-form surfaces protruding outward. When the light rays of the light source enter the light guide plate body through refraction on the light incident side, the free-form surfaces formed by the intersection of the first cut groove and the second cut groove block the divergent light rays of the light source, so that the light rays of the light source can be reflected or scattered when passing through the free-form surfaces, thereby changing the conduction direction of the light rays of the light source. Thus, the angles of diffuse reflection or scattering of the light rays of the light source are narrowed in multiple directions, and the light rays of the light source are concentrated and directed to the effective viewing area of the light exit surface, so that the light rays of the light source are reasonably distributed, and are refracted and emitted through the third cut groove. In this way, the light emission brightness of the light can be enhanced, and the utilization rate of light energy can be improved. When small flaws or white dots are formed on the light guide plate due to processing, the free-form surface can change the conduction direction of the light rays of the light source that are originally reflected or converged on the small flaws or white dots, so as to weaken the brightness of the bright spots or interference fringes generated by the small flaws or white dots, thereby improving the concealment of the light guide plate.

[0009] Preferably, the depths of the second cut grooves are arranged to gradually increase from the light incident side along the length direction of the light guide plate body to the light exit side.

[0010] By adopting the above technical solution, the depth arrangement gradually increases along the length direction of the light guide plate, so that the light rays of the light source are not easily leaked from the light exit side. When the light rays of the light source are conducted to one end close to the light exit side in the light guide plate body, due to the gradually increasing depth of the second cut groove, the light rays of the light source can be blocked and reflected or scattered to the light exit surface, so that the light rays of the light source are not easily leaked from the light exit side, the brightness of the light guide plate close to the light exit side is improved, and the light energy loss is reduced.

[0011] Preferably, the depths of the multiple second cut grooves are arranged to change in a Bézier curve.

[0012] By adopting the above technical solution, during the propagation of the light rays of the light source in the light guide plate, the depth of the second cut groove arranged to change in a Bézier curve can accurately adjust the depth of the second cut groove. Due to the change of the Bézier curve, the depth of the second cut groove controlled according to the change of the Bézier curve can be used to optimize the structure of the light guide plate, thereby controlling the light energy distribution of the light guide plate, reasonably distributing the light energy on the light guide plate body, making the light emission brightness of the light guide plate uniform, and further reducing the light energy loss.

[0013] Preferably, the free-form surface includes a first inclined surface and a second inclined surface. The first inclined surface and the second inclined surface are arranged at intervals in sequence along the length direction of the light guide plate. A vertex angle is formed between the first inclined surface and the second inclined surface, and the vertex angle remains unchanged. The range of the vertex angle is 80°-140°.

[0014] By adopting the above technical solution, the apex angle is within 80° - 140°, which is beneficial for the first inclined surface to receive more light rays of the light source, is beneficial for reflecting the light rays of the light source to the effective viewing area of the light-emitting surface, and makes the reflection effect of the light rays of the light source better.

[0015] Preferably, the depth of the second cut groove is less than or equal to the depth of the first cut groove.

[0016] By adopting the above technical solution, the depth of the second cut groove is less than or equal to that of the first cut groove, which can ensure the formation of a convex free-form surface to ensure that the diffusion angle of the light rays of the light source can be narrowed.

[0017] Preferably, the length of the first inclined surface is longer than the length of the second inclined surface.

[0018] By adopting the above technical solution, the first inclined surface is longer than the second inclined surface, and the first inclined surface is located at one end close to the light-incident side. In this way, the first inclined surface can receive more light rays of the light source, making the reflection effect of the light rays of the light source better, so as to further enhance the directivity of the light rays of the light source.

[0019] Preferably, the free-form surface further includes a plurality of first curved surfaces and a plurality of second curved surfaces. The first curved surfaces and the second curved surfaces are arranged at intervals in sequence along the width direction of the light guide plate body. The opposite side edges of the first curved surfaces and the second curved surfaces are coincidentally connected, and the radius of curvature of the first curved surfaces and the second curved surfaces is equal.

[0020] By adopting the above technical solution, the radius of curvature of the first curved surfaces and the second curved surfaces is equal, and the opposite side edges of the first curved surfaces and the second curved surfaces are connected, which changes the directivity of the light rays of the light source on the reflection surface, and also narrows the diffusion angle of the light rays of the light source in the width direction of the light guide plate, so that the light rays of the light source located in this direction can tend to be within the effective viewing area.

[0021] Preferably, a plurality of light-emitting curved surfaces are arranged in sequence along the width direction of the light guide plate, and the opposite side edges of two adjacent light-emitting curved surfaces are coincidentally connected.

[0022] By adopting the above technical solution, the opposite side edges of two adjacent light-emitting curved surfaces are coincidentally connected, making the light-emitting surface form an uneven curved surface, so that the light-emitting surface refracts and emits the light rays of the light source. When the light rays of the light source pass through the light-emitting curved surface, the light-emitting direction of the light rays of the light source is changed, so that the light rays of the light source can be evenly distributed.

[0023] Preferably, the light-emitting curved surfaces are all arranged in an arc shape.

[0024] By adopting the above technical solution, the light-emitting curved surfaces are all arranged in an arc shape, so that the light rays of the light source are diffused in multiple directions within the effective viewing area, effectively reducing local light concentration or light overlap, and also improving the softness of the light rays of the light source.

[0025] Preferably, a plurality of dot patterns are provided on the reflecting surface.

[0026] By adopting the above technical solution, the dot patterns can compensate for the areas with relatively dark local brightness, making the light output of the light guide plate more uniform, so as to improve the overall light output brightness of the backlight guide plate.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The light rays of the light source are refracted and emitted under the combined action of the first cut groove, the second cut groove and the third cut groove, so that the angle of diffuse reflection or scattering of the light rays of the light source formed on the reflecting surface is narrowed, and the light rays are reasonably distributed in the effective viewing area. In this way, the light output brightness of the light rays can be improved, so as to improve the light energy utilization rate, and the concealment of small defects or white spots can also be improved;

[0029] 2. The curvature radii of the first curved surface and the second curved surface are equal, and the light rays of the light source can be reflected in multiple directions, and the light rays of the light source can be distributed more evenly;

[0030] 3. The first inclined surface is longer than the second inclined surface, so that the first inclined surface can receive more light rays of the light source, and the reflection effect on the light rays of the light source is better, so as to further enhance the directivity of the light rays of the light source. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the optical path principle of the related art;

[0032] Figure 2 is a side view of an embodiment of the present application;

[0033] Figure 3 is a schematic structural diagram of Embodiment 1 of the present application;

[0034] Figure 4 is a plan view of the reflecting surface in Embodiment 1 of the present application with only the first cut groove;

[0035] Figure 5 is a side view of the reflecting surface in Embodiment 1 of the present application with only the second cut groove;

[0036] Figure 6 is a schematic diagram of the Bessel advanced curve of Embodiment 1 of the present application;

[0037] Figure 7 is a partial plan view of the reflecting surface in Embodiment 1 of the present application;

[0038] Figure 8 is a schematic optical path diagram of the light guide plate in Embodiment 1 of the present application;

[0039] Figure 9It is a schematic structural diagram of the light guide plate body in Embodiment 2 of the present application;

[0040] Figure 10 It is a schematic plan view of the light-emitting surface in Embodiment 3 of the present application;

[0041] Figure 11 It is a schematic structural diagram of the light guide plate body in Embodiment 3 of the present application;

[0042] Figure 12 It is a schematic plan view of the light-emitting surface in Embodiment 3 of the present application;

[0043] Figure 13 It is a partial schematic plan view of the reflecting surface in Embodiment 4 of the present application.

[0044] Explanation of reference numerals: 1. Light guide plate body; 2. Light incident side; 3. Light emitting side; 4. Reflecting surface; 5. Light emitting surface; 6. First cut groove; 7. Second cut groove; 8. Third cut groove; 9. Arc-shaped protrusion; 10. Dot pattern; 11. First curved surface; 12. Second curved surface; 13. Light emitting curved surface; 131. Starting curve; 132. Ending curve; 14. First inclined surface; 15. Second inclined surface; 16. First overlapping edge; 17. Second overlapping edge; 18. Third overlapping edge; 19. Fourth overlapping edge; 20. Central curve. Detailed implementation manners

[0045] The following will Figures 1-13 further describe the present application in detail with reference to the

[0046] As Figure 1 shown in the schematic diagram of the optical path principle in the related art, it includes a light guide plate body 1, and the light guide plate body 1 is made of PMMA material. The two ends in the length direction of the light guide plate body 1 are set as the light incident side 2 and the light emitting side 3. In this embodiment, the light incident side 2 of the light guide plate is the light source incident direction. The two side surfaces in the thickness direction of the light guide plate body 1 are respectively set as the reflecting surface 4 and the light emitting surface 5, where the light emitting surface 5 is the effective viewing area of the light guide plate body 1. A plurality of dot patterns 10 are formed on the reflecting surface 4 of the light guide plate body 1, and a plurality of arc-shaped protrusions 9 are formed on the light emitting surface 5.

[0047] When the light rays of the light source enter the light guide plate body 1 through the light incident side 2, the light rays of the light source are refracted at the light incident side 2 and conducted to the reflection surface 4, and then the light rays of the light source are reflected or scattered by the dot patterns 10 provided on the reflection surface 4 to the light exit surface 5 and refracted out of the light exit surface 5. Thus, the light rays of the light source are reflected by the dot patterns 10 on the reflection surface 4 to the light exit surface 5 in a non-directional distribution, and the light rays of the light source form a large diffuse reflection or scattering angle, making it difficult to utilize the light rays in the effective viewing area and resulting in a large loss of light energy. In addition, when small flaws or white spots are formed during the processing of the light guide plate body 1, the light rays of the light source incident on the light guide plate body 1 will be reflected by the small flaws or white spots to the light exit surface 5, so that obvious fringe interference or bright spots appear when the light guide plate body 1 emits light.

[0048] Therefore, in order to utilize the light rays of the light source in the effective viewing area, improve the light energy utilization rate, and improve the concealment of small flaws or white spots, an embodiment of the present application discloses a high-brightness and high-concealment light guide plate.

[0049] Embodiment 1:

[0050] Referring to Figure 2 and Figure 3 , a first cut groove 6 is provided on the reflection surface 4 of the light guide plate body 1. The first cut groove 6 is arranged along the length direction of the light guide plate body 1 and is consistent with the light source incident direction. The depth of the first cut groove 6 needs to be greater than or equal to 20 um to ensure that the first cut groove 6 has a good light condensing effect. In this embodiment, multiple first cut grooves 6 can be provided, and the multiple first cut grooves 6 are arranged in sequence along the width direction of the light guide plate body 1, so that the reflection surface 4 forms multiple first curved surfaces 11 and second curved surfaces 12 that can reflect or scatter the light rays of the light source.

[0051] Referring to Figure 4 , in this embodiment, the multiple first curved surfaces 11 and the multiple second curved surfaces 12 are arranged at intervals along the width direction of the light guide plate body 1. The opposite sides of the adjacent first curved surface 11 and the second curved surface 12 coincide to form a first coincidence edge 16 and a second coincidence edge 17 respectively. Taking the light exit surface 5 as the reference plane, the first coincidence edge 16 is located at one end of the first curved surface 11 and the second curved surface 12 away from the light exit surface 5, and the second coincidence edge 17 is located at one end of the first curved surface 11 and the second curved surface 12 close to the light exit surface 5. Both the first curved surface 11 and the second curved surface 12 are arc-transitioned from the first coincidence edge 16 to the second coincidence edge 17 along the end away from the light exit surface 5, and the radius of curvature of the first curved surface 11 is equal to the radius of curvature of the second curved surface 12, so that the first curved surface 11 and the second curved surface 12 form two equal-shaped and oppositely arranged curved surfaces.

[0052] As Figure 4The figure shows a schematic plan view of the reflecting surface 4 of the light guide plate body 1 only processed with the first cut groove 6. When the light rays of the light source enter the light guide plate body 1 through refraction on the light incident side 2, the light rays of the light source are conducted to the first curved surface 11 and the second curved surface 12 under the action of refraction. Since both the first curved surface 11 and the second curved surface 12 are arranged in an arc shape, the first curved surface 11 and the second curved surface 12 can change the conduction direction of the light rays of the light source and play a role in condensing the light rays of the light source, increasing the light receiving surface of the reflecting surface 4. In this way, more light rays of the light source can be reflected or scattered to the light emitting surface 5.

[0053] It should be noted that the opposite two side edges of the adjacent first curved surface 11 and the second curved surface 12 may not coincide. At this time, there is a distance between the first curved surface 11 and the second curved surface 12, and more light rays of the light source can also be reflected or scattered to the light emitting surface 5.

[0054] Refer to Figure 3 , the reflecting surface 4 is also provided with a second cut groove 7. The second cut groove 7 is arranged along the width direction of the light guide plate and is consistent with the direction perpendicular to the light source direction. The second cut groove 7 is a non-isosceles V-shaped groove. At the same time, multiple second cut grooves 7 can be provided. The multiple second cut grooves 7 are distributed from the light incident side 2 to the light emitting side 3, and the multiple second cut grooves 7 are arranged in sequence along the length direction of the light guide plate body 1. The distance between the light incident side 2 and one end of the first second cut groove 7 close to the light incident side 2 is 0.001 mm, and the distance between the light emitting side 3 and one end of the last second cut groove 7 close to the light emitting side 3 is 0.02 mm, so that bright edges are not likely to appear on the light incident side 2 and the light emitting side 3.

[0055] Such as Figure 5 The figure shows a schematic plan view of the reflecting surface 4 of the light guide plate body 1 only having the second cut groove 7. The reflecting surface 4 forms a plurality of first inclined surfaces 14 and second inclined surfaces 15 through a plurality of second cut grooves. The plurality of first inclined surfaces 14 and the plurality of second inclined surfaces 15 are arranged at intervals in sequence along the length direction of the light guide plate body 1 from the light incident side 2 to the light emitting side 3. The opposite two ends of the adjacent first inclined surface 14 and the second inclined surface 15 are overlapped and connected. Taking the light emitting surface 5 as a reference plane, the first inclined surface 14 is inclined from the light incident side 2 along the end close to the light emitting surface 5, and the second inclined surface 15 is inclined from the light incident side 2 along the end away from the light emitting surface 5.

[0056] Taking the second inclined surface 15 as the starting surface and the first inclined surface 14 as the ending surface, the included angle formed by connecting the starting surface and the ending surface is the apex angle θ. The apex angle θ is within the range of 80° - 140°. At this time, the effect of the first inclined surface 14 reflecting the light rays of the light source is better, making the light rays of the light source have better directivity. In addition, the length of the first inclined surface 14 is longer than the length of the second inclined surface 15, so that the first inclined surface 14 can receive more light rays of the light source and reflect them to the light emitting surface 5, so that more light rays of the light source are directed to the effective viewing area.

[0057] Refer to Figure 5and Figure 6 , with the apex angle θ remaining unchanged, the depth of the second groove 7 gradually increases in the direction closer to the light-emitting side 3, and the arrangement of the depth of the second groove 7 on the light guide plate body 1 is set to change in a Bézier advanced curve. In this way, the change in the depth of the second groove 7 can be accurately adjusted, reducing the light energy loss caused during the conduction of the light source light in the light guide plate body 1. The Bézier advanced curve equation is, where, P i is the set position vector of (n + 1) second grooves 7, which is used to control the depth of the second groove 7, is the Bernstein function.

[0058] As Figure 6 shown in the Bézier curve graph, the abscissa is the length of the light guide plate, and the ordinate is the depth of the second groove 7. When the control point P i changes, the depth of the second groove 7 gradually increases with the length of the light guide plate. It can be seen from this that the closer the light guide plate body 1 is to the light-emitting side 3, the deeper the depth of the second groove 7. Therefore, a reference axis P1 perpendicular to the reflection surface 4 and intersecting the reflection surface 4 is set. During the conduction of the light source light in the light guide plate body 1, the closer the light source light is to the light-emitting side 3, the angle between the first inclined surface 14 and the reference axis P1 will gradually decrease. In this way, more light source light conducted to the light-emitting side 3 will be blocked and reflected to the light-emitting surface 5, reducing the overflow of the light source light from the light-emitting side 3. As a result, more light energy is reasonably distributed in the effective viewing area, making the light emission of the light guide plate body 1 uniform and improving the brightness of the light guide plate body 1 near the light-emitting side 3.

[0059] Referring to Figure 3 and Figure 7 , the reflection surface 4 is processed by alternately arranging a plurality of first grooves 6 and a plurality of second grooves 7, so that a plurality of first curved surfaces 11, second curved surfaces 12, first inclined surfaces 14, and second inclined surfaces 15 coincide and are connected to form a free curved surface protruding away from the light-emitting surface 5. To ensure that after the first groove 6 and the second groove 7 are compound processed, the reflection surface 4 can form a plurality of outwardly protruding free curved surfaces, the maximum depth of the second groove 7 needs to be less than or equal to the depth of the first groove 6.

[0060] As Figure 7 and Figure 8As shown, the light rays of the light source are refracted from the light incident side 2 into the light guide plate body 1 and conducted to the free-form surface, where the light rays of the light source converge. At this time, the light rays of the light source are reflected or scattered on the first inclined surface 14 and tend to the effective viewing area of the light emitting surface 5, thereby narrowing in the light ray conduction direction of the light source. At the same time, the light rays of the light source are conducted to the first curved surface 11 or the second curved surface 12 and reflected or scattered thereon, and the angle formed by the reflected or scattered light rays of the light source narrows in the width direction of the light guide plate body 1. Therefore, when the light rays of the light source pass through the free-form surface, the angle of diffuse reflection or scattering of the light rays of the light source on the reflecting surface 4 is narrowed in multiple directions, enhancing the directivity of the light rays of the light source and concentrating the light rays of the light source within the effective viewing area.

[0061] Referring to Figure 8 , a third cutting groove 8 is provided on the light emitting surface 5 of the light guide plate body 1. The third cutting groove 8 is arranged along the length direction of the light guide plate body 1 and is consistent with the light source incident direction. In this embodiment, multiple third cutting grooves 8 can be provided, and the multiple third cutting grooves 8 are arranged in sequence along the width direction of the light guide plate body 1, so as to form multiple light emitting curved surfaces 13 on the light emitting surface 5 that can refract and emit the light rays of the light source.

[0062] In this embodiment, the opposite sides of two adjacent light emitting curved surfaces 13 coincide to form a third coincidence edge 18 and a fourth coincidence edge 19 respectively. The third coincidence edge 18 is located at one end of the light emitting curved surface 13 away from the reflecting surface 4, and the fourth coincidence edge 19 is located at one end of the light emitting curved surface 13 close to the reflecting surface 4. At the same time, the light emitting curved surface 13 is in arc transition from the third coincidence edge 18 to the fourth coincidence edge 19 along the end away from the reflecting surface 4, and the radius of curvature range of the light emitting curved surface 13 is between 3 - 7 um. When the light rays of the light source are conducted from the reflecting surface 4 to the light emitting surface 5, the light rays of the light source can be refracted and emitted in multiple directions on the light emitting curved surface 13.

[0063] Referring to Figure 8 , when multiple first cutting grooves 6 and second cutting grooves 7 are processed on the reflecting surface 4 and multiple third cutting grooves 8 are processed on the light emitting surface 5, under the combined action of the multiple free-form surfaces and the multiple light emitting curved surfaces 13, the light ray conduction direction is changed, so that the light rays of the light source are evenly distributed within the effective viewing area of the light guide plate body 1, improving the light energy utilization rate, enhancing the brightness of the light guide plate, and being able to increase by 20%.

[0064] It is worth mentioning that when small flaws or white spots are formed during the processing of the light guide plate body 1, this will damage the conduction path of the light source light in the light guide plate body 1, causing the light source light to deviate from the original conduction direction, resulting in uneven brightness when the light guide plate body 1 emits light, thereby generating fringe interference or bright spots. Under the combined action of multiple free-form surfaces and multiple light-emitting surfaces 13, the light source light can be diverged in multiple directions within the effective viewing area, the conduction direction of the light is adjusted according to the occurrence of white spots or small flaws, the brightness of the stripes or bright spots formed by the light source light is weakened, and the reflection of the light source light on the small flaws or white spots is reduced, so that the light emitted by the light guide plate remains uniform, thereby covering the small flaws or white spots to reduce the phenomenon of uneven brightness seen by the naked eye when people view the light guide plate.

[0065] It should be noted that when the light guide plate, the LED light source, and the reflective film form a backlight source, there will be a situation of uneven local brightness and darkness in the light-emitting picture of the backlight source. Therefore, after the second cutting groove 7 is processed on the reflecting surface 4, a small amount of dot patterns 10 need to be compensated. The dot patterns 10 can be processed by sandblasting, laser dotting, mechanical dotting and other methods. The dot patterns 10 are randomly distributed along the length direction of the light guide plate body 1 so that the dot patterns 10 are distributed to form an irregular pattern, and each dot pattern 10 is a hemispherical protrusion. In this way, the dot patterns 10 can play a role in condensing the light source light, compensating the brightness of the locally darker area, making the light emitted by the light guide plate body 1 uniform, improving the overall light-emitting brightness of the backlight source, and also reducing the adsorption force and friction force between the reflecting surface 4 of the light guide plate body 1 and the reflective film, so that the light guide plate is not easily adsorbed and worn by the reflective film.

[0066] The implementation principle of Embodiment 1 of this application is as follows: A first cutting groove 6 and a second cutting groove 7 are added to the reflecting surface 4. The first cutting groove 6 is arranged along the direction parallel to the light source, and the second cutting groove 7 is arranged along the direction perpendicular to the light source. The first cutting groove 6 and the second cutting groove 7 are arranged in an alternating manner, so that the first curved surface 11 and the second curved surface 12, as well as the first inclined surface 14 and the second inclined surface 15, jointly form multiple free-form surfaces. At the same time, a third cutting groove 8 is provided on the light-emitting surface 5 of the light guide plate to form multiple light-emitting surfaces 13. Under the combined cooperation of the multiple free-form surfaces and the multiple light-emitting surfaces 13, the light is concentrated within the effective viewing area, enhancing the directivity of the light source light, thereby improving the utilization efficiency of light energy.

[0067] Embodiment 2: Different from Embodiment 1, refer to Figure 9 and Figure 10, one end point of two adjacent third coincidence edges 18 close to the light-emitting side 3 coincides and is connected. The two side edges in the length direction of the light-emitting surface 13 are set as the starting curve 131 and the ending curve 132. The starting curve 131 is located on the light-incident side 2, and the ending curve 132 is located on the light-emitting side 3. The curvature radius of the starting curve 131 is smaller than that of the ending curve 132, and both are within 0 - 25 μm. The curvature radius of the light-emitting surface 13 gradually increases from the starting curve 131 to the ending curve 132 along the length direction of the light guide plate body 1. In this way, the light-receiving surface of the light-emitting surface 13 gradually increases from the light-incident side 2 to the light-emitting side 3 along the parallel light source direction, and makes the light source light rays located on the light-emitting side 3 more tend to the effective viewing area, improving the brightness of the light guide plate body 1 on the light-emitting side 3, and enabling better adjustment when the light source light rays on the light-emitting side 3 emit light, so that the emitted light brightness is more uniform.

[0068] It should be noted that the distance between one end of the third cutting groove 8 and the light-incident side 2 is 0.03 mm, and the distance between one end of the third cutting groove 8 and the light-emitting side 3 is 0.01 mm, reducing the occurrence of bright edges on the light-incident side 2 and the light-emitting side 3.

[0069] The implementation principle of Embodiment 2 of this application is: the curvature radius of the light-emitting surface 13 gradually increases from the starting curve 131 to the ending curve 132 along the length direction of the light guide plate. In this way, the light-emitting surface 13 as the light-receiving surface gradually increases from the light-incident side 2 to the light-emitting side 3 along the length direction of the light guide plate body 1, and can make the light source light rays close to the light-emitting side 3 refract and emit light better, so as to improve the uniformity of the light-emitting brightness of the light guide plate.

[0070] Embodiment 3: Refer to Figure 11 and Figure 12 , different from Embodiment 1 and Embodiment 2, the midpoints of two adjacent third coincidence edges 18 coincide and are connected. The two ends in the length direction of the light-emitting surface 13 are respectively set as the starting curve 131 and the ending curve 132, and the curvature radius of the starting curve 131 is equal to that of the ending curve 132. A central curve 20 is also provided on the light-emitting surface 13. The central curve 20 is located at the midpoint of the light-emitting surface 13, and the curvature radius of the central curve 20 is greater than that of the starting curve 131 and the ending curve 132. The curvature radii of the starting curve 131, the ending curve 132, and the central curve 20 are all within the range of 0 - 8 μm. The light-emitting surface 13 gradually increases from the starting curve 131 and the ending curve 132 to near the central curve 20 along the length direction of the light guide plate. In this way, the uniformity of the light source light rays emitting light on the light-emitting surface 5 is further optimized, and the light source light rays are reasonably distributed in the effective viewing area.

[0071] The implementation principle of Embodiment 3 of this application is as follows: The curvature radius of the starting curve 131 is equal to that of the ending curve 132, and the curvature radius of the central curve 20 is greater than those of the starting curve 131 and the ending curve 132, making the direction of the light source rays more inclined towards the middle effective viewing area, so as to improve the light-emitting brightness of the light guide plate body 1 and the light energy utilization rate.

[0072] Embodiment 4: Different from Embodiment 1, referring to Figure 13 , the first cut groove 6 can also be an isosceles V-shaped groove, and its depth needs to be greater than or equal to 20 μm. In this embodiment, the opposite two side edges of two adjacent V-shaped grooves can be arranged in a coincident connection or at intervals. In this way, they are arranged in a criss-cross pattern with the second cut groove 7, so that the reflecting surface 4 forms a plurality of prism-shaped protrusions. These protrusions can reflect the light source rays that form diffuse reflection or scattering on the reflecting surface 4 through multiple planes of the protrusions, thereby narrowing the angle of the light source rays and enhancing the directivity of the light source rays, improving the light-emitting brightness of the light guide plate, and making the light emission of the light guide plate more uniform.

[0073] The implementation principle of Embodiment 4 of this application is as follows: The setting of the V-shaped groove can enhance the directivity of the light source rays, enabling the light source rays to be further concentrated in the effective viewing area, thereby improving the light energy utilization rate.

[0074] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A high - brightness and high - concealer light guide plate, comprising a light guide plate body (1), an incident light side (2) and an outgoing light side (3) are arranged at both ends of the light guide plate body (1) in the length direction, and a reflecting surface (4) and an outgoing light surface (5) are respectively arranged on both surface sides of the light guide plate body (1) in the thickness direction, characterized in that: A plurality of first grooves (6) and a plurality of second grooves (7) are provided on the reflecting surface (4). The plurality of first grooves (6) are arranged parallel to the incident direction of the light source, and the plurality of second grooves (7) are all arranged perpendicular to the incident direction of the light source. The second grooves (7) are V-shaped grooves with unequal waists. The plurality of first grooves (6) and the plurality of second grooves (7) are arranged in a crisscross pattern to form a plurality of free-form surfaces that protrude outward. The free-form surfaces include a first inclined surface (14) and a second inclined surface (15). The first inclined surface (14) and the second inclined surface (15) are arranged at intervals in sequence along the length direction of the light guide plate. A vertex angle is formed between the first inclined surface (14) and the second inclined surface (15). The vertex angle remains unchanged, and the range of the vertex angle is 80° - 140°. The free-form surfaces further include a plurality of first curved surfaces (11) and a plurality of second curved surfaces (12). The first curved surfaces (11) and the second curved surfaces (12) are arranged at intervals in sequence along the width direction of the light guide plate body (1). The opposite side edges of the first curved surface (11) and the second curved surface (12) coincide and are connected. The first curved surface (11), the second curved surface (12), the first inclined surface (14), and the second inclined surface (15) coincide and are connected to form the free-form surface that protrudes away from the light-emitting surface (5). The light-emitting surface (5) forms a plurality of light-emitting curved surfaces (13) through a plurality of third grooves (8). The plurality of light-emitting curved surfaces (13) are arranged in sequence along the width direction of the light guide plate body (1), and the opposite side edges of two adjacent light-emitting curved surfaces (13) coincide and are connected.

2. The high-brightness and high-coverage light guide plate according to claim 1, wherein: The depths of the respective second grooves (7) are arranged to gradually increase from the light-incident side (2) along the length direction of the light guide plate body (1) to the light-emitting side (3).

3. A high-brightness and high-concealment light guide plate according to claim 2, characterized in that: The depths of the plurality of second grooves (7) are arranged to change in a Bézier curve.

4. A high-brightness and high-concealment light guide plate according to claim 2, characterized in that: The depth of the second groove (7) is less than or equal to the depth of the first groove (6).

5. A high-brightness and high-coverage light guide plate according to claim 1, characterized in that: The length of the first inclined surface (14) is longer than the length of the second inclined surface (15).

6. The high-brightness and high-coverage light guide plate according to claim 1, wherein: The opposite side edges of the first curved surface (11) and the second curved surface (12) coincide and are connected, and the radius of curvature of the first curved surface (11) and the second curved surface (12) is equal.

7. A high-brightness and high-coverage light guide plate according to claim 1, characterized in that: The light-emitting curved surfaces (13) are all arranged in an arc shape.

8. A high-brightness and high-coverage light guide plate according to claim 1, characterized in that: The reflecting surface (4) is provided with a plurality of dot patterns (10).

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