A light guide plate with high light splitting ratio, a preparation method thereof, a light source module and a display assembly

Abstract

The application discloses a high-spectroratio light guide plate and a preparation method thereof, a light source module and a display assembly. The high-spectroratio light guide plate is applied to a light-emitting side of a reflective liquid crystal display panel and comprises a light guide plate body and a plurality of first microstructures which are inwardly recessed on a reflecting surface. Each first microstructure comprises an inclined surface which faces a light-incident surface. The included angle between the inclined surface and the reflecting surface ranges from 27.5° to 57.5°, so that the ratio of the effective light-emitting energy of the light-emitting surface of the high-spectroratio light guide plate to the ineffective light-emitting energy of the reflecting surface ranges from 5:1 to 10:1, and the ratio of the effective light-emitting energy of the light-emitting surface to the ineffective light-emitting energy of the reflecting surface in a normal field range ranges from 10:1 to 22:1. The application sets the inclined surface of the first microstructure which faces the light-incident surface at a reasonable angle, so as to adjust the propagation angle of the light rays incident to the inclined surface, improve the proportion of the effective light rays and the ineffective light rays of the light guide plate, and improve the picture contrast, especially the picture contrast in the normal field.

Description

Technical Field

[0001] This invention relates to the field of reflective display device technology, and in particular to a high beam ratio light guide plate and its preparation method, light source module, and display component. Background Technology

[0002] Currently, based on the different lighting methods of liquid crystal displays (LCDs), they can be divided into three types: transmissive liquid crystal displays, reflective liquid crystal displays, and transflective liquid crystal displays.

[0003] Reflective liquid crystal displays (LCDs) primarily use ambient light as their light source. To ensure effective display even in low-light conditions, current technology involves placing a light guide plate between the user and the LCD screen, utilizing a front-emitting light source in dark environments. However, because the front-emitting light source (such as an LED) has a certain divergence angle, the light emitted from it exits from both the top and bottom surfaces of the existing light guide plate. This results in lower effective energy incident on the reflective LCD and higher ineffective energy exiting directly from the light guide plate, directly impacting the display's contrast ratio.

[0004] Therefore, considering the aforementioned technical problems, it is necessary to propose a new technical solution. Summary of the Invention

[0005] This invention aims to solve one of the technical problems existing in the prior art, and proposes a high beam ratio light guide plate and its preparation method, light source module, and display component to improve the contrast of the light guide plate.

[0006] To achieve the objective of the invention, in a first aspect, the present invention provides a high beam splitting ratio light guide plate, comprising:

[0007] The light guide plate body includes a light incident surface, a light emitting surface, and a reflective surface, wherein the light incident surface and the light emitting surface are arranged opposite to each other, and the light incident surface is respectively connected to the reflective surface and the light emitting surface;

[0008] Multiple first microstructures are recessed inwardly on the reflective surface. Each first microstructure includes a slope facing the light-incident surface. The angle between the slope and the reflective surface ranges from 27.5° to 57.5°, so that the ratio of the effective light-emitting energy of the light-emitting surface of the high-resolution light guide plate to the ineffective light-emitting energy of the reflective surface is between 5:1 and 10:1, and the ratio of the effective light-emitting energy of the light-emitting surface to the ineffective light-emitting energy of the reflective surface of the high-resolution light guide plate in the frontal field of view is between 10:1 and 22:1.

[0009] Secondly, the present invention provides a method for preparing a high beam splitter plate, comprising:

[0010] A light guide plate body is provided, the light guide plate body including a light incident surface and a reflective surface;

[0011] Provide a light guide plate mold core;

[0012] Multiple first microstructures are formed on the reflective surface of the light guide plate body using nanoimprinting using the light guide plate mold core. Each first microstructure includes an inclined surface facing the light incident surface, and the angle between the inclined surface and the reflective surface ranges from 27.5° to 57.5°.

[0013] Thirdly, the present invention provides a light source module, including any of the high beam ratio light guide plates described above and a light source located on one side of the light incident surface of the high beam ratio light guide plate.

[0014] Fourthly, the present invention provides a display component, including any of the above-mentioned light source modules and a reflective liquid crystal display panel, wherein the light source module is located on the light-emitting side of the reflective liquid crystal display panel.

[0015] Compared with the prior art, the embodiments of this application provide a high beam ratio light guide plate applied to the light-emitting side of a reflective liquid crystal display panel. By setting the inclined surface of the first microstructure facing the light-incident surface within a reasonable angle range (27.5°-57.5°), the propagation angle of the light incident on the inclined surface can be adjusted, making the peak angle of the emitted light closer to the normal direction of the reflective surface. The effective light emission angle of the light-emitting surface is controlled within a field of view of -5°-25°, and the ineffective light emission angle of the reflective surface is controlled within a field of view of greater than 50°. Thus, the ratio of the effective light emission energy of the light-emitting surface to the ineffective light emission energy of the reflective surface of the high beam ratio light guide plate is between 5:1 and 10:1, and the ratio of the effective light emission energy of the light-emitting surface to the ineffective light emission energy of the reflective surface of the high beam ratio light guide plate within the front field of view is between 10:1 and 22:1, thereby improving the image contrast, especially the image contrast within the front field of view. Attached Figure Description

[0016] Figure 1 A schematic diagram of the cross-sectional structure of the high beam splitting ratio light guide plate provided in the embodiments of this application;

[0017] Figure 2 A schematic diagram showing the position of the first microstructure within a high beam-ratio light guide plate, as provided in an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of light propagation within a high beam-splitting ratio light guide plate provided in an embodiment of this application.

[0019] Figure 4A schematic diagram showing the relationship between the angle between the inclined surface and the reflecting surface of the first microstructure of the high beam splitting ratio light guide plate provided in this embodiment of the application and the beam splitting ratio;

[0020] Figure 5 A schematic diagram illustrating the relationship between the effective and ineffective light output of the high beam ratio light guide plate provided in this embodiment of the application and the field of view;

[0021] Figure 6 A schematic diagram showing the distribution of the first microstructure within a high beam-ratio light guide plate provided in an embodiment of this application;

[0022] Figure 7 A schematic diagram showing the distribution of a second microstructure within a high beam-ratio light guide plate provided in an embodiment of this application;

[0023] Figure 8 A schematic diagram showing the placement angle of a first microstructure in a high-resolution light guide plate, provided in an embodiment of this application;

[0024] Figure 9 This is a schematic diagram of a high beam splitting ratio light guide plate structure provided in an embodiment of this application;

[0025] Figure 10 This is a schematic diagram of another high beam splitting ratio light guide plate structure provided in an embodiment of this application;

[0026] Figure 11 This is a schematic diagram of the process for fabricating a high beam ratio light guide plate according to an embodiment of this application;

[0027] Figure 12 This is a schematic diagram of a mold master preparation method provided in an embodiment of this application;

[0028] Figure 13 This is a schematic diagram illustrating a method for forming microstructures by impact of a die head, as provided in an embodiment of this application.

[0029] Figure 14 This is a schematic diagram of the structure of a light source module provided in an embodiment of this application;

[0030] Figure 15 This is a schematic diagram of the structure of a display component provided in an embodiment of this application;

[0031] Figure 16 This is a schematic diagram showing the relationship between the light energy emitted from the reflective and emitting surfaces of the high beam-ratio light guide plate in Embodiment 1 of this application and the field of view.

[0032] Figure 17 This is a schematic diagram of the structure of the first microstructure in Embodiment 2 of this application;

[0033] Figure 18This is a schematic diagram showing the relationship between the light energy emitted from the reflecting and emitting surfaces of two high beam-ratio light guide plates in this application and the field of view.

[0034] Figure 19A and Figure 19B These are schematic diagrams of two structures of the first microstructure in Embodiment 3 of this application;

[0035] Figure 20 This is a schematic diagram showing the relationship between the light energy emitted from the reflecting and emitting surfaces of the high beam-splitting light guide plates in three embodiments of this application and the field of view.

[0036] Figure 21 A schematic diagram of the first microstructure in Embodiment 4 of this application;

[0037] Figure 22 This is a schematic diagram showing the relationship between the light energy emitted from the reflecting and emitting surfaces of four high beam-ratio light guide plates implemented in this application and the field of view.

[0038] Figure 23 A schematic diagram of the first microstructure in Embodiment 5 of this application;

[0039] Figure 24 This is a schematic diagram showing the relationship between the light energy emitted from the reflecting and emitting surfaces of the high beam-ratio light guide plates in five embodiments of this application and the field of view.

[0040] Figure 25 A schematic diagram of the first microstructure in Embodiment Six of this application;

[0041] Figure 26 This is a schematic diagram showing the relationship between the light energy emitted from the reflecting and emitting surfaces of six high-resolution light guide plates implemented in this application and the field of view.

[0042] Figures 27A to 27D The diagram illustrates the relationship between the effective and ineffective light output and the field of view angle for the placement angle of the four first microstructures in the high resolution light guide plate provided as reference examples in this application. Detailed Implementation

[0043] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description of the specific implementation methods, structure, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0044] Please refer to Figure 1 The high beam ratio light guide plate of this application embodiment is applied to the light-emitting side of a reflective liquid crystal display panel. The high beam ratio light guide plate includes:

[0045] The light guide plate body 1 includes a light incident surface 11, a light emitting surface 12 and a reflective surface 13. The light incident surface 11 and the light emitting surface 12 are arranged opposite to each other, and the light incident surface 11 is respectively connected to the reflective surface 13 and the light emitting surface 12.

[0046] Multiple first microstructures 2 are recessed inward on the reflective surface 13. Each first microstructure 2 includes a slope 21 facing the light-incident surface 11. The angle between the slope 21 and the reflective surface 13 ranges from 27.5° to 57.5°, so that the ratio of the effective light-emitting energy of the light-emitting surface of the high-resolution light guide plate to the ineffective light-emitting energy of the reflective surface is between 5:1 and 10:1, and the ratio of the effective light-emitting energy of the light-emitting surface of the high-resolution light guide plate to the ineffective light-emitting energy of the reflective surface in the frontal field of view is between 10:1 and 22:1.

[0047] Here, the reflecting surface 13 and the emitting surface 12 are at an angle to the incident surface 11, and the reflecting surface 13 and the emitting surface 12 can be at an angle or parallel. Preferably, the reflecting surface 13 and the emitting surface 12 are parallel and both are perpendicular to the incident surface 11.

[0048] In this embodiment, the ratio of the effective light-emitting energy of the light-emitting surface 12 of the high-resolution light guide plate to the ineffective light-emitting energy of the reflective surface 13 is also the refractive ratio of the high-resolution light guide plate, hereinafter referred to as the refractive ratio. Generally, light guide plates used in reflective liquid crystal display panels are required to have a refractive ratio of not less than 5:1, and the optimal angle of incidence on the reflective liquid crystal display panel is between 0 and 20°, that is, the peak effective light-emitting angle of the light guide plate used in reflective liquid crystal display panels is between 0 and 20°.

[0049] Here, the field of view of the high beam ratio light guide plate specifically refers to the field of view range of -5° to 25°.

[0050] The high-resolution light guide plate of this embodiment can be used in a reflective liquid crystal display. The high-resolution light guide plate of the reflective liquid crystal display is located on the light-emitting side of the reflective liquid crystal display panel. After the light is emitted from the light-emitting surface 12 of the high-resolution light guide plate, it is incident on the reflective liquid crystal display panel and reflected by the reflective liquid crystal display panel to the light receiving device of the reflective liquid crystal display or a human observer.

[0051] Please continue to refer to this. Figure 1Multiple first microstructures 2 are recessed inward on the reflective surface 13. Each first microstructure 2 includes a slope 21 and another slope 22. The slope 21 faces the light-incident surface 11, and the angle between the slope 21 and the reflective surface 13 ranges from 27.5° to 57.5°. That is, the slope 21 faces the light-incident surface 11. The first side of the slope 21 starts from the reflective surface 13 within the light guide plate body 1 and slopes away from the light-incident surface 11, so that the angle between the slope 21 and the reflective surface 13 ranges from 27.5° to 57.5°. Thus, after light enters from the light-incident surface 11, most of the light incident on or reflected to the first microstructure 2 will be reflected by the slope 21 of the first microstructure 2. In other words, the first microstructure 2 reflects most of the light incident on or reflected to the first microstructure 2 through the slope 21.

[0052] Understandably, the other inclined surface 22 of the first microstructure 2 can also be other shapes, such as curved surfaces or other irregular shapes, and this application embodiment does not limit this.

[0053] In some embodiments, the first side of the inclined surface 21 may not originate from the reflective surface 13 within the light guide plate body 1, but may originate from any position within the light guide plate body 1. Simultaneously, to tilt the inclined surface 21 away from the light incident surface 11, the distance from the second side of the inclined surface 21 to the light incident surface 11 is greater than the distance from its first side to the light incident surface 11. The first side and the second side are two opposite sides of the inclined surface 21, and the distance from either the first or second side to the light incident surface 11 is the distance from the midpoint of the first side or the midpoint of the second side to the light incident surface 11.

[0054] In some embodiments, one side of the inclined surface 21 begins at the reflective surface 13 within the light guide plate body 1.

[0055] Furthermore, the angle between the inclined plane 21 and the reflecting surface 13 refers to the angle between the plane containing the inclined plane 21 and the plane containing the reflecting surface 13. For details, please refer to... Figure 2 Line segment AB is a line segment intercepted on inclined plane 21 by a reference plane, wherein the reference plane is a plane perpendicular to the reflecting surface 13. Since inclined plane 21 is inclined away from the reflecting surface 13 and away from the incident light surface 11, the distance from endpoint B of line segment AB to the incident light surface 11 is greater than the distance from endpoint A to the incident light surface 11.

[0056] Meanwhile, the angle between the inclined plane 21 and the reflecting surface 13 is also called angle CAB, or α. Here, the angle α ranges from 27.5° to 57.5°. Preferably, the angle α ranges from 32.5° to 45°; more preferably, the angle α ranges from 35° to 43°.

[0057] Understandably, in a preferred embodiment, the first microstructure 2 can reflect more than 80% of the light incident on or reflected to the first microstructure 2 via the inclined surface 21.

[0058] In this embodiment, the distribution rule of the first microstructure 2 on the reflective surface 13 can be random distribution or distribution according to a preset distribution rule, such as array distribution, distribution according to a distribution density trend, etc.

[0059] Here, there are gaps between the first microstructures 2.

[0060] In this embodiment, multiple first microstructures 2 are arranged on the reflective surface 13 of the high beam ratio light guide plate. After the light emitted by the LED is coupled into the high beam ratio light guide plate, its propagation direction will change after being refracted and / or reflected by the first microstructures 2.

[0061] Please refer to Figure 3 , Figure 3 This is a schematic diagram simulating the light propagation of a high beam ratio light guide plate based on an embodiment of this application, wherein the angle between the inclined surface 21 and the reflective surface 13 is α.

[0062] Specifically, some light rays are reflected or refracted by at least one first microstructure 2, and finally emitted from the light-emitting surface 12. For example, Figure 3 The light rays with exit angles of θ1, θ2, and θ3.

[0063] Here, we take the light ray L1 with an exit angle of θ1 as an example for explanation: the light ray L1 enters from the light-incident surface 11 of the high beam ratio light guide plate at an incident angle γ, propagates forward at an angle δ in the high beam ratio light guide plate, and is incident on the inclined surface 21 of the first microstructure 2 at an angle η. After being reflected by the inclined surface 21, it exits from the light-outcident surface 12 of the high beam ratio light guide plate at an angle θ1.

[0064] During the propagation of the light ray L1 described above, the following conditions are met:

[0065] sin(γ)=n*sin(δ) (1)

[0066] Where: n is the refractive index of the high-split-ratio light guide plate substrate.

[0067] η=90°–α–δ (2)

[0068] ε=2*η+δ–90° (3)

[0069] From the above formulas (2) and (3), we get:

[0070] ε=90°–2*α–δ (4)

[0071] Let the emission angle from the light-emitting surface of the high-split-ratio light guide plate be θ1~0°, then ε=0°;

[0072] Then formula (4) simplifies to:

[0073] α=45°–δ / 2 (5)

[0074] From formulas (1) and (5), we get:

[0075] α=45°–arcsin(sin(γ) / n) / 2 (6)

[0076] Obviously, for a light guide plate substrate with a specific refractive index, in order to make the light emitted from the light-emitting surface 12 of the high beam ratio light guide plate at a vertical angle or a small angle, the angle α between the inclined surface 21 of the first microstructure 2 and the reflective surface 13 can be reasonably set.

[0077] Here, preferably, the angle α between the inclined surface 21 of the first microstructure 2 and the reflective surface 13 is in the range of 27.5°-57.5°.

[0078] Simultaneously, some light rays also exit from the reflective surface 13 of the high-resolution light guide plate, exiting at a large exit angle; this portion of light is ineffective. For example, Figure 3 Light ray L2 in the image.

[0079] In addition, some light rays, before entering the first microstructure 2, will continue to propagate within the high-resolution light guide plate due to total internal reflection. For example, Figure 3 Light L3 in the middle.

[0080] For further information, please continue to refer to [link / reference]. Figure 3 Based on the high beam splitting ratio light guide plate of this application embodiment, the density of effective light is greater than the density of ineffective light. The density of effective light is the number of effective light rays emitted from a unit light emitting surface 12, and the density of ineffective light is the number of ineffective light rays emitted from a unit reflective surface 13.

[0081] Furthermore, the angle between the inclined surface 21 of the first microstructure on the high-resolution light guide plate and the reflecting surface 13, and the beam splitting ratio of the high-resolution light guide plate satisfy the following relationship:

[0082] y = 0.1159x 2 +1.7062x+2.9168 (7)

[0083] In the above formula (7), y is the spectral ratio and x is the angle between the inclined plane 21 and the reflecting surface 13, in degrees.

[0084] Based on the high beam splitting ratio light guide plate provided in the embodiments of this application, please refer to... Figure 4 When the angle between the inclined surface 21 and the reflective surface 13 is set at 27.5°-57.5°, the beam splitting ratio of the high beam splitting ratio light guide plate can be between 5:1 and 10:1.

[0085] For details, please continue to refer to Figure 4 When the angle between the inclined surface 21 and the reflective surface 13 is set at 27.5°, the beam splitting ratio of the high beam splitting ratio light guide plate is 5:1; when the angle between the inclined surface 21 and the reflective surface 13 is set at 42.5°, the beam splitting ratio of the high beam splitting ratio light guide plate is 9.6:1.

[0086] Furthermore, when the angle between the inclined surface 21 of the high beam splitter plate and the reflecting surface 13 is set at 42.5°, Figure 5 The diagram illustrates the relationship between the effective and ineffective light-emitting energy of a high-splitting-ratio light guide plate and the field of view. Please refer to [the diagram]. Figure 5 The high-resolution light guide plate has an effective light emission angle peak of around 0°, with 75% of the effective light emission energy concentrated in the front field of view (-5°-25°); the ineffective light emission angle peak is around 73°, with only 25% of the ineffective light emission energy concentrated in the front field of view (-5°-25°); the resolution ratio is 9.6:1, and the resolution ratio in the front field of view is 22:1, which greatly improves the resolution ratio of the high-resolution light guide plate in the front field of view.

[0087] In summary, based on the high beam ratio light guide plate provided in this application embodiment, by setting the inclined surface of the first microstructure facing the light incident surface within a reasonable angle range (27.5°-57.5°), the propagation angle of the light incident on the inclined surface can be adjusted, making the peak angle of the emitted light closer to the normal direction of the reflecting surface. The effective light emission angle of the light emission surface is controlled within a field of view of -5°-25°, and the ineffective light emission angle of the reflecting surface is controlled within a field of view of greater than 50°. Thus, the ratio of the effective light emission energy of the light emission surface of the high beam ratio light guide plate to the ineffective light emission energy of the reflecting surface is between 5:1 and 10:1, and the ratio of the effective light emission energy of the light emission surface of the high beam ratio light guide plate to the ineffective light emission energy of the reflecting surface is between 10:1 and 22:1 within the front field of view, thereby improving the image contrast, especially the image contrast within the front field of view.

[0088] In some embodiments, please refer to Figure 1 The high beam splitter plate also includes:

[0089] Multiple second microstructures 3 are recessed inward on the reflective surface 13, and each second microstructure 3 includes an arc surface 31 facing the light incident surface 11.

[0090] Specifically, multiple second microstructures 3 are recessed inward on the reflective surface 13. Each second microstructure 3 includes an arc surface 31 facing the light-incident surface 11. That is, the arc surface 31 faces the light-incident surface 11, and the third side of the arc surface 31 originates from the reflective surface 13 within the light guide plate body 1 and is inclined away from the light-incident surface 11. Thus, after light enters from the light-incident surface 11, most of the light incident on or reflected to the second microstructure 3 is reflected by the arc surface 31 of the second microstructure 3. In other words, the second microstructure 3 reflects most of the light incident on or reflected to it through the arc surface 31.

[0091] In some embodiments, the third side of the arc surface 31 may not originate from the reflective surface 13 within the light guide plate body 1, but may originate from any position within the light guide plate body 1. Simultaneously, to tilt the arc surface 31 away from the light incident surface 11, the distance from the fourth side of the arc surface 31 to the light incident surface 11 is greater than the distance from its third side to the light incident surface 11. The fourth side and the third side are two opposite sides of the arc surface 31, and the distance from the third side or the fourth side to the light incident surface 11 is the distance from the midpoint of the third side or the midpoint of the fourth side to the light incident surface 11.

[0092] In some embodiments, the arc surface 31 is a smooth, regular arc surface.

[0093] Understandably, in a preferred case, the second microstructure 3 reflects more than 80% of the light incident on or reflected to the second microstructure 3 through the curved surface 31.

[0094] In this embodiment, the arc surface 31 is convex to the light-incident surface 11, or the arc surface 31 is concave to the light-incident surface 11. Preferably, the arc surface 31 is convex to the light-incident surface 11.

[0095] In this embodiment, the distribution rule of the second microstructure 3 on the reflective surface 13 can be random distribution or distribution according to a preset distribution rule, such as array distribution, distribution according to a distribution density trend, etc.

[0096] Furthermore, there are gaps between the second microstructures 3 and between the first microstructure 2 and the second microstructure 3.

[0097] In this embodiment, multiple second microstructures 3 are introduced on the light-incident surface to disperse the light, disrupting the directional propagation of light. This eliminates the hotspot phenomenon on the light-incident side of the light guide plate (i.e., when the light guide plate uses an LED as a light source, the divergence angle of the LED light source is limited, resulting in a bright light column in the area of ​​the light guide plate near the LED light source, causing uneven brightness. This phenomenon reduces the uniformity of light output from the light guide plate and also affects the subjective effect of backlighting), and adjusts the uniformity of light output from the entire light guide plate.

[0098] In some embodiments, the angle between the inclined surface 21 of the first microstructure 2 and the reflective surface 13 is 32.5°-45°.

[0099] In this embodiment, when the angle between the inclined surface 21 of the first microstructure 2 and the reflective surface 13 is 32.5°-52.5°, the ratio of the effective light-emitting energy of the light-emitting surface of the high beam ratio light guide plate to the ineffective light-emitting energy of the reflective surface can be between 7:1 and 10:1.

[0100] In some embodiments, the first microstructure 2 is one or more of a pyramid, prism, partial sphere, and partial cylinder.

[0101] Specifically, in one embodiment, the first microstructure 3 is a pyramid, and the bottom surface of the pyramid is on the same plane as the reflecting surface 13. Then, the inclined surface 21 of the first microstructure 2 is a side surface of the pyramid, which faces the light-incident surface 11.

[0102] Understandably, the first microstructure 3 can also be a frustum.

[0103] In another embodiment, the first microstructure 3 is a prism, the bottom surface of the prism is on the same plane as the reflective surface 13, and the edges of the prism are inclined from the reflective surface away from the light-incident surface 11 within the light guide plate body 1. Then the inclined surface 21 of the first microstructure 2 is a side surface of the prism, which faces the light-incident surface 11.

[0104] In another embodiment, the first microstructure 3 is a partial sphere, which may be a part of a sphere cut off based on an inclined surface. The partial sphere includes the inclined surface and a part of the sphere. The inclined surface faces the light-incident surface 11 and the angle between it and the reflective surface 13 is in the range of 27.5°-57.5°. The inclined surface is the inclined surface 21 of the first microstructure 2.

[0105] Understandably, a part of a sphere can be a hemisphere, a quarter sphere, an eighth sphere, etc.

[0106] In another embodiment, the first microstructure 3 is a partial cylinder, which may be a portion of a cylinder cut off based on an inclined surface. The partial cylinder includes an inclined surface and a partial cylinder. The inclined surface faces the light-incident surface 11 and the angle between it and the reflective surface 13 is in the range of 27.5°-57.5°. The inclined surface is the inclined surface 21 of the first microstructure 2.

[0107] Understandably, a portion of a cylinder can be a 1 / 2 cylinder, a 1 / 4 cylinder, a 1 / 8 cylinder, etc.

[0108] Obviously, the above are only examples of some specific structures of the first microstructure 2. The specific structure of the first microstructure 2 in the embodiments of the present invention is not limited to these. It can also be other regular or irregular structures, as long as it has an inclined surface facing the light-incident surface 11 and the angle between the inclined surface and the reflective surface 13 is in the range of 27.5°-57.5°.

[0109] In some embodiments, the inclined surface 21 of the first microstructure 2 is an optically smooth surface, and the roughness Ra of the inclined surface 21 is 30nm-150nm. For example, the surface roughness of the inclined surface 21 is 100nm, which allows for specular reflection of light incident on or reflected thereon.

[0110] In some embodiments, the second microstructure 3 is one or more of the following: hemispherical, cylindrical, teardrop-shaped, and horseshoe-shaped.

[0111] Specifically, in one embodiment, the second microstructure 3 is hemispherical, with its bottom surface and the reflecting surface 13 on the same plane. The arc surface 31 of the second microstructure 3 is a partial spherical surface of the hemispherical shape, and this partial spherical surface faces the light-incident surface 11. It can be understood that the second microstructure 3 can also be partially spherical, such as a 1 / 2 sphere, a 1 / 4 sphere, or a 1 / 8 sphere. In this case, the arc surface 31 of the second microstructure 3 is all or part of the spherical surface of this partial spherical shape, and this all or part of the spherical surface faces the light-incident surface 11.

[0112] In another embodiment, the second microstructure 3 is cylindrical, with the bottom surface of the cylinder and the reflective surface 13 on the same plane, and the axis of the cylinder is inclined from the reflective surface 13 away from the light-incident surface 11 within the light guide plate body 1. Then, the arc surface 31 of the second microstructure 3 is part of the side surface of the cylinder, and this part of the side surface faces the light-incident surface 11.

[0113] In another embodiment, the second microstructure 3 is teardrop-shaped, and the axis of the teardrop shape is inclined in the direction away from the light incident surface 11 from the self-reflecting surface within the light guide plate body 1. The arc surface 31 of the second microstructure 3 is part of the outer surface of the teardrop-shaped structure, and this part of the outer surface faces the light incident surface 11.

[0114] In another embodiment, the second microstructure 3 is a horseshoe-shaped axis that is inclined in the direction away from the light-incident surface 11 from the self-reflecting surface within the light guide plate body 1. The arc surface 31 of the second microstructure 3 is part of the outer surface of the horseshoe-shaped structure, and this part of the outer surface faces the light-incident surface 11.

[0115] Understandably, the above are only examples of some specific structures of the second microstructure 3. The specific structure of the second microstructure 3 in the embodiments of the present invention is not limited to these. It can also be other regular or irregular structures, as long as it has an arc surface facing the light-incident surface 11, and preferably, the arc surface is a regular curved surface.

[0116] In some embodiments, the arc surface 31 of the second microstructure 3 is an optically smooth surface, and the roughness of the arc surface 31 is 30 nm - 150 nm. For example, the surface roughness of the arc surface 31 is 100 nm, so that specular reflection can be performed on the light incident on or reflected onto it.

[0117] In some embodiments, please refer to Figure 6 , the first spacing between any two adjacent first microstructures 2 decreases as the first average distance from the two adjacent first microstructures 2 to the light incident surface 11 increases, and the first spacing and the first average distance satisfy an exponential function relationship with the first average distance as the independent variable and the first spacing as the dependent variable.

[0118] Here, please refer to Figure 6 , taking two adjacent first microstructures M and N as an example, the first average distance refers to the average value of the distance d1 from the first microstructure M to the light incident surface 11 and the distance d2 from the first microstructure N to the light incident surface 11, that is, the first average distance d3 is (d1 + d2) / 2. Among them, when determining the distance d1 from the first microstructure M to the light incident surface 11 and the distance d2 from the first microstructure N to the light incident surface 11, they are determined respectively based on the same structural positions of the first microstructure M and the first microstructure N. For example: d1 and d2 are determined respectively based on the points on the first microstructure M and the first microstructure N that are closest to the light incident surface. It can be understood that when determining d1 and d2, they can also be determined based on the points on the first microstructure M and the first microstructure N that are farthest from the light incident surface, the geometric center, the center of gravity, etc.

[0119] In this embodiment, the exponential function relationship between the first average distance d3 and the first spacing D1 can be expressed as follows:

[0120] D1 = a*(d3) b + D0 (8)

[0121] In the above formula (8), both a and b are constants, and 0 < a < 1, 1 < b < 5, D0 is a preset distance from a first microstructure 2 to the light incident surface 11, for example: D0 is the distance from the first microstructure 2 with the smallest distance from the light incident surface 11 to the light incident surface 11.

[0122] In some embodiments, from the light incident surface 11 to the direction away from the light incident surface 11, the distribution density of the first microstructures 2 on the reflection surface 13 shows an increasing trend. Among them, from the light incident surface 11 to the direction away from the light incident surface 11 means, on the reflection surface 13 of the light guide plate body 1, from the light incident surface 11 to the direction of its opposite surface. For example, from the light incident surface 11 to the direction away from the light incident surface 11 is the Figure 5 direction S shown. Along the direction S, the distribution density of the first microstructures 2 on the reflection surface 13 gradually increases.

[0123] Furthermore, the reflective surface 13 can be divided into multiple regions starting from the light-incident surface 11. Among these regions, the greater the distance from the light-incident surface 11, the higher the density of the first microstructure 2. Here, the multiple regions can be regions of the same size on the reflective surface 8, or regions of different sizes. Moreover, the area of ​​the multiple regions can be set to a small area unit, such as square millimeters or square micrometers, according to actual application needs, to more precisely control the distribution of the first microstructure 2 on the light guide plate body 1.

[0124] For details, please continue to refer to Figure 6 The reflective surface 13 is divided into regions A, B, C and D sequentially from the incident light surface 11. The density of the first microstructure 2 increases sequentially in regions A, B, C and D.

[0125] Furthermore, in some embodiments, please refer to Figure 7 The second spacing between any two adjacent second microstructures 3 increases as the second average distance from the two second microstructures 3 to the light incident surface 11 increases, and the second spacing and the average distance satisfy an exponential function relationship with the second average distance as the independent variable and the second spacing as the dependent variable.

[0126] Please refer to this. Figure 7 Taking two adjacent microstructures P and Q as examples, the second average distance refers to the average of the distance d4 from the second microstructure P to the light-receiving surface 11 and the distance d5 from the second microstructure Q to the light-receiving surface 11, that is, the second average distance d6 is (d4+d5) / 2. When determining the distance d4 from the second microstructure P to the light-receiving surface 11 and the distance d5 from the second microstructure Q to the light-receiving surface 11, they are determined based on the same structural positions of the second microstructures P and Q, respectively. For example, d4 and d5 are determined based on the points on the second microstructure P and Q that are closest to the light-receiving surface. Understandably, d4 and d5 can also be determined based on the points on the second microstructure P and Q that are farthest from the light-receiving surface, their geometric centers, gravitational centers, etc.

[0127] In this embodiment, the exponential function relationship between the second average distance d6 and the second spacing D2 can be expressed as follows:

[0128] D2 = e*(1 / d6) f +D` (9)

[0129] In the above formula (9), both e and f are constants, where 0 < e < 1 and 1 < f < 10. D` is the preset distance from the second microstructure 3 to the light incident surface 11. For example, D` is the distance from the second microstructure 3 with the minimum distance to the light incident surface 11 to the light incident surface 11.

[0130] In some embodiments, in the direction from the light incident surface 11 to away from the light incident surface 11, the distribution density of the second microstructure 3 on the reflection surface 13 shows a decreasing trend.

[0131] Here, along the direction S, the distribution density of the second microstructure 3 on the reflection surface 13 gradually decreases.

[0132] In this embodiment, the second microstructure 3 is only provided within a preset area, and the preset area can be part or all of the reflection surface 11.

[0133] For example, the preset area can be the area from 1 / 3 - 1 / 2 of the reflection surface 11 starting from the light incident surface 11 to away from the light incident surface 11. That is, the preset area accounts for 1 / 3 - 1 / 2 of the entire reflection surface and starts from the junction of the light incident surface 11 and the reflection surface 13.

[0134] Further, the preset area can be sequentially divided into multiple areas starting from the light incident surface 11. Among the multiple areas starting from the light incident surface 11, the density of the second microstructure 3 in the area with a larger distance from the light incident surface 11 is smaller. Here, the multiple areas can be areas with the same area size within the preset area or areas with different area sizes, and the area of the multiple areas can be set to a smaller area unit according to actual application needs, such as square millimeters, square micrometers, etc., to more precisely control the distribution of the preset area on the light guide plate body 1.

[0135] Specifically, please continue to refer to Figure 7 , the preset area is sequentially divided into area E, area F, area G, and area H starting from the light incident surface 11, and the density of the preset area in area E, area F, area G, and area H decreases in sequence.

[0136] Since the light guide efficiency of the first microstructure 2 with an inclined surface design is high, the number of them set near the light incident surface 11 is small. At the same time, by increasing the second microstructure 3 with a relatively low light guide efficiency, the combination of the two can effectively reduce the hot spot or light spot phenomenon near the LED light bar of the front light module and improve the picture display quality.

[0137] In some embodiments, the range of both the length and width of the first microstructure 2 is 10um - 40um.

[0138] In some embodiments, the depth range of the first microstructure 2 is 3um - 20um.

[0139] In some embodiments, the length and width of the second microstructure 3 are both in the range of 5µm-20µm.

[0140] In some embodiments, the depth of the second microstructure 3 ranges from 3µm to 15µm.

[0141] Here, a spatial coordinate system is established to better represent the dimensions of the first microstructure 2 and the second microstructure 3. For details, please refer to... Figure 8 The dimensions of the first microstructure 2 in the spatial coordinate system are used as an example for illustration. The direction from the incident surface 11 to its opposite surface is the X-axis direction, the direction from the first side surface 14 to its opposite surface is the Y-axis direction, and the direction from the reflecting surface 13 away from its opposite surface is the Z-axis direction.

[0142] Then, the length L in the X-axis direction and the width W in the Y-axis direction of the first microstructure 2 are both in the range of 10um-40um, preferably 20um-30um, and more preferably 25um-30um; the length h (i.e., depth) of the first microstructure 2 in the Z-axis direction is 3um-20um, preferably 10um-20um, and more preferably 10um-15um.

[0143] Correspondingly, the length and width of the second microstructure 3 in the X-axis direction and the Y-axis direction are both 5um-20um, preferably 10um-20um, and more preferably 15um-20um; the depth of the second microstructure 3 in the Z-axis direction is 3um-15um, preferably 3um-10um, and more preferably 3um-5um.

[0144] In some embodiments, a V-shaped prism structure 4 is provided on the light-incident surface 11.

[0145] For details, please refer to Figure 9 and Figure 10 A V-shaped prism structure 4 is provided on the light-incident surface 11, which can adjust the angle distribution of the light from the light source entering the high beam ratio light guide plate.

[0146] In this embodiment, the V-shaped prism structure 4 is a prism body, a cylindrical lens body, or a combination of a prism body and a cylindrical lens.

[0147] In some embodiments, the refractive index of the light guide plate body 1 is greater than the refractive index of air; for example, the refractive index of the light guide plate body 1 is 1.59.

[0148] In some embodiments, the light guide plate body 1 may be composed of a single polymer material or may be composed of two or more polymer materials layered together.

[0149] In some embodiments, a plurality of first microstructures 2 are integrated with the light guide plate body 1, and / or a plurality of second microstructures 3 are integrated with the light guide plate body 1.

[0150] In one embodiment, the light guide plate body 1 and the first microstructure 2 are integrally molded from a plastic material, and / or the light guide plate body 1 and the second microstructure 3 are integrally molded from a plastic material, wherein the plastic material may be polycarbonate (PC), polymethyl methacrylate (PMMA), etc.

[0151] This application also provides a method for fabricating a high-resolution light guide plate; please refer to [reference needed]. Figure 11 ,include:

[0152] Step S1: Provide a light guide plate body, the light guide plate body including a light incident surface and a reflective surface;

[0153] Step S2: Provide a light guide plate mold core;

[0154] Step S3: Using the light guide plate mold core, a plurality of first microstructures are formed on the reflective surface of the light guide plate body by nanoimprinting. The first microstructure includes an inclined surface facing the light incident surface, and the angle between the inclined surface and the reflective surface is in the range of 27.5°-57.5°.

[0155] Based on the above preparation method, a high beam-ratio light guide plate comprising multiple first microstructures as described in any of the above embodiments can be prepared.

[0156] In this embodiment, the light guide plate mold core has multiple protrusions on one side corresponding to the first microstructure.

[0157] In some embodiments, in the method for preparing a high-split-ratio light guide plate, step S3 above may further be:

[0158] Step S3': Using the light guide plate mold core, a plurality of first microstructures and a plurality of second microstructures are formed on the reflective surface of the light guide plate body by nanoimprinting. The first microstructure includes a slope facing the light incident surface, and the angle between the slope and the reflective surface is in the range of 27.5°-57.5°. The second microstructure includes an arc surface facing the light incident surface.

[0159] Based on the above preparation method, a high beam-ratio light guide plate comprising multiple first microstructures and multiple second microstructures as described in any of the above embodiments can be prepared.

[0160] In this embodiment, one side of the light guide plate mold core has multiple protrusions corresponding to the first microstructure and multiple second microstructures.

[0161] In some embodiments, step S3' above includes:

[0162] Step S31': Using a light guide plate mold core, multiple first microstructures and multiple second microstructures are formed on the reflective surface of the light guide plate body by photopolymerization molding.

[0163] In this embodiment, UV curing can be used for photocuring.

[0164] Specifically, step S1 above includes:

[0165] Step S11: Provide a substrate layer, which may be composed of a single polymer material or a combination of two or more polymer materials in layers;

[0166] Step S12: Apply photosensitive adhesive evenly to the surface of the substrate layer to form a photosensitive adhesive layer, thereby obtaining the light guide plate body. The side of the photosensitive adhesive layer closest to the substrate layer is the reflective surface of the light guide plate body.

[0167] Specifically, the photosensitive adhesive can be applied by using a coating head to evenly coat the surface of the substrate layer.

[0168] Furthermore, following step S12 above, step S31' specifically includes:

[0169] A light guide plate mold is used to imprint a photosensitive adhesive layer. During imprinting, the side of the light guide plate mold with a raised structure is brought into close contact with the photosensitive adhesive layer. Then, an ultraviolet lamp is used to irradiate the area, causing the graphic structure formed on the photosensitive adhesive layer to solidify before it is peeled off from the light guide plate mold. This transfers the graphic structure on the surface of the light guide plate mold to the surface of the substrate layer, forming multiple first microstructures and multiple second structures on the reflective surface of the light guide plate body. The first microstructure includes a bevel facing the light incident surface, and the angle between the bevel and the reflective surface ranges from 27.5° to 57.5°. The second microstructure includes an arc surface facing the light incident surface.

[0170] In other embodiments, step S3' above includes:

[0171] Step S32': Using the light guide plate mold core, a plurality of first microstructures and a plurality of second microstructures are formed on the reflective surface of the light guide plate body by hot pressing.

[0172] Specifically, it includes the following steps:

[0173] Step S321': Heat the light guide plate body to soften the reflective surface of the light guide plate body;

[0174] Step S322': Imprint the reflective surface of the softened light guide plate body using the light guide plate mold core;

[0175] Step S323': Cool and solidify the light guide plate body. After cooling, the light guide plate body has multiple first microstructures and multiple second microstructures on the reflective surface side. The first microstructure includes an inclined surface facing the light incident surface, and the angle between the inclined surface and the reflective surface is in the range of 27.5°-57.5°. The second microstructure includes an arc surface facing the light incident surface.

[0176] In some embodiments, step S2 above includes:

[0177] Step S21: Provide a substrate;

[0178] Step S22: A plurality of first recesses and a plurality of second recesses are formed on the substrate to obtain a mold master plate, wherein the outline of the first recess is the same as the outline of the first microstructure, and the outline of the second recess is the same as the outline of the second microstructure.

[0179] Step S23: Perform metal growth and original mold separation on the mold master plate to obtain the light guide plate mold core.

[0180] In some embodiments, step S22 above includes:

[0181] Step S22': Multiple first pits and multiple second pits are formed on the substrate by 3D grayscale photolithography to obtain the mold master.

[0182] Specifically, it includes the following steps:

[0183] Step S221': Provide a first convex topography model and a second convex topography model, wherein the contour of the first convex topography model is the same as the contour of the first microstructure, and the contour of the second convex topography model is the same as the contour of the second microstructure.

[0184] Step S222': A photolithographic part with multiple first and second microstructures is fabricated on a glass substrate coated with photoresist by laser exposure. The pattern structure on the obtained photolithographic part is transferred to a metal template by metal growth and mold separation technology to obtain a metal core with multiple convex pattern structures.

[0185] In some embodiments, step S22 above includes:

[0186] Step S22”: Multiple first pits and multiple second pits are formed on the substrate by laser direct writing to obtain the mold master.

[0187] In some embodiments, step S22 above includes:

[0188] Step S22": The mold head moves relative to the substrate to form a plurality of first recesses and a plurality of second recesses on the substrate to obtain a mold master.

[0189] Specifically, it includes the following steps:

[0190] Step S221”': Provide a first convex diamond die and a second convex diamond die, wherein the outline of the first convex diamond die is the same as the outline of the first microstructure, and the outline of the second convex diamond die is the same as the outline of the second microstructure.

[0191] Step S222": A mold master plate with multiple first recesses and multiple second recesses is formed on the substrate by mechanical impact. Here, the substrate can be a plate made of mirror metal material.

[0192] Here, we will take the example of forming multiple first pits on the substrate by using a mold head to move relative to the substrate.

[0193] Please refer to Figure 12 and Figure 13 If the substrate is a mirror metal material plate, the first microstructure morphology being formed is struck on the mirror metal material plate by the up and down movement of the first convex diamond die head 6 (i.e., diamond cutter head), and its distribution mode can be the distribution mode described in any of the above embodiments.

[0194] By using the above-mentioned method of forming microstructures through die impact, the corresponding microstructure can be formed with a single impact, thus enabling the formation of microstructures with similar morphology to the die structure in one go.

[0195] Understandably, the same method described above can be used to create multiple second pits on the substrate by impacting with a second convex diamond die.

[0196] Please refer to Figure 14 The present invention also provides a light source module, including a high beam ratio light guide plate as described in any of the above embodiments and a light source 5 located on one side of the light incident surface 11 of the high beam ratio light guide plate.

[0197] Here, the light source 5 can be an LED light-emitting element, and the light emitted by the light source enters the high beam ratio light guide plate through the light incident surface 11. The wavelength range of the light emitted by the light source 5 is 380nm-780nm.

[0198] Please refer to Figure 15 The present invention also provides a display component, including a light source module and a reflective liquid crystal display panel 7 as described in any of the above embodiments, wherein the light source module is located on the light-emitting side of the reflective liquid crystal display panel 7.

[0199] Specifically, the reflective liquid crystal display panel 7 is disposed on one side of the light-emitting surface 12 of the light guide plate body 1. The reflective liquid crystal display panel 7 and the light-emitting surface 12 of the light guide plate body 1 are positioned opposite each other. During assembly, the light-emitting surface 12 is brought close to the reflective liquid crystal display panel 7, so that the light emitted from the light-emitting surface 12 will enter the reflective liquid crystal display panel 7. Furthermore, the space between the reflective liquid crystal display panel 7 and the light guide plate body 1 can be an adhesive layer or an air layer.

[0200] The display component in this application embodiment is based on a high beam ratio light guide plate, and its contrast ratio can be greater than 8:1.

[0201] To further illustrate the beneficial effects of the technical solution of this application, the following will give the beneficial effects of the high beam-splitting ratio light guide plate of the inclined surface 21 of the first microstructure 2 set at different angles based on specific embodiments:

[0202] Example 1

[0203] The upper surface (i.e., the reflecting surface 13) of the light guide plate body 1 of the high beam ratio light guide plate has multiple irregularly arranged first microstructures 2. For example, when the first microstructure 2 is a pyramid or a partial pyramid (i.e., a frustum structure), specifically, as Figure 8 Taking the first microstructure 2 in the example as an example, Figure 8 The first microstructure 2 has an inclined surface 21 facing the light-incident surface 11 (i.e., close to the light-incident surface 11), with the inclined surface 21 forming an angle α with the reflecting surface 13. The inclined surface 22 of the first microstructure 2 facing away from the light-incident surface 11 (i.e., away from the light-incident surface 11) forms an angle β with the reflecting surface 13. The length of the base of the pyramid is L, the width is W, and the height of the pyramid is h, where α = 42.5°, β = 80°, W = 20 μm, and L = 20 μm.

[0204] Figure 16 This is a schematic diagram showing the relationship between the light energy emitted from the reflecting surface 13 and the emitting surface 12 of a high beam splitter plate and the field of view. According to... Figure 16 It can be seen that the light energy distribution emitted from the reflective surface 13 of the high-resolution light guide plate has a specific peak emission angle. At this time, the peak emission angle of the reflective surface 13 is emitted at a large angle in the vertical direction (the direction of light propagation within the light guide plate), with a peak emission angle ω = 71°, a peak center point relative energy of 0.88, and a 0° field of view of 0.25. The light energy emitted from the emitting surface is emitted at a small angle, concentrated near the front field of view (-5 to 25°), with a peak angle θ = 0.9° in the vertical direction and a peak center point relative energy of 5.31. Compared to existing light guide plates, its peak emission angle is closer to the normal direction of the reflective surface 13. At this time, the overall emission ratio of the emitting surface 12 and the reflective surface 13 is 9.3:1; the front field of view emission ratio is approximately 22:1.

[0205] Furthermore, when the angle α between the inclined plane 21 and the reflecting surface 13 is changed, the relationship between the angle values ​​of the angle α between the inclined plane 21 and the reflecting surface 13 and the beam splitting ratio and the light emission angle is shown in Table 1 below:

[0206] Table 1. Relationship between the angle value of the first microstructure and the spectrophotometric ratio and light emission angle.

[0207]

[0208]

[0209] As shown in Table 1 above, by adjusting the angle α of the light guide dot microstructure, the peak angle and light emission ratio of the emitted light energy from the reflective surface 13 and the emitting surface 12 of the light guide plate can be controlled to meet different needs. For example, reflective liquid crystals require the emitted light to be as close as possible to the normal of the light guide plate, such as 0°-20°, and require a high beam splitting ratio, especially in the front field of view. Thus, the preferred range of α is 32.5°-45°, with the optimal range being 35°-43°.

[0210] The angle value of the microstructure β has little impact on the light emission direction and field of view, and therefore does not need to be considered as a key control parameter. Thus, no special requirements are placed on this angle of the light guide dot microstructure. The depth and width of the microstructure affect the intensity of the emitted energy; since the intensity is also related to the dot density of the light guide plate, this will not be discussed in detail here.

[0211] Example 2:

[0212] Based on the above embodiment one, please refer to Figure 17 When the morphology of the first microstructure 2 can be as follows Figure 17 When a 1 / 4 cylinder is shown, α ranges from 32.5° to 50°, the depth h ranges from 2µm to 20µm, and the radius of curvature of the cylinder ranges from 5µm to 30µm.

[0213] Specifically, for example, when α = 42.5°, depth h = 9 μm, and cylindrical radius of curvature R = 18 μm, the light guide plate substrate PC has a thickness of 0.4 mm. The high-resolution light guide plate with the first microstructure 2 having the above morphology, when light is coupled in from the incident surface 11, exhibits the following relationship between the light energy emitted from the reflecting surface 13 and the emitting surface 12 and the field of view: Figure 18 As shown.

[0214] like Figure 18As shown, the peak angle of the light emitted from the reflective surface 13 is large in the vertical direction (the direction of light propagation within the light guide plate), with a peak angle of ω = 73° and a half-peak width of 92° across the entire field of view. The light emitted from the light-emitting surface is at a small angle, with a peak angle of θ = 0.9° in the vertical direction and a half-peak width of 47° across the entire field of view. The overall light emission ratio of the light-emitting surface 12 and the reflective surface 13 is 9:1; the light energy splitting ratio at the front field of view is approximately 22:1.

[0215] Example 3:

[0216] As described in Example 1, please refer to Figure 19A When the morphology of the first microstructure 2 can be as follows Figure 19A When a 1 / 8 sphere is shown, α ranges from 32.5° to 50°, the depth h ranges from 2µm to 20µm, and the radius of curvature of the sphere ranges from 5µm to 30µm.

[0217] Specifically, for example, when α = 42.5°, depth h = 6 μm, and the radius of curvature of the sphere R = 18 μm, the light guide plate substrate PC has a thickness T = 0.4 mm. The high-resolution light guide plate with the first microstructure 2 having the above morphology, when light is coupled in from the incident surface 11, the relationship between the light energy emitted from the reflecting surface 13 and the emitting surface 12 and the field of view is as follows: Figure 20 As shown.

[0218] Understandably, the morphology of the first microstructure 2 can also be... Figure 19B Please refer to the structure shown. Figure 19B In this structure, α ranges from 32.5° to 50°, the depth h ranges from 2um to 20um, and the radius of curvature of the sphere ranges from 5um to 30um.

[0219] like Figure 20 As shown, the peak angle of the light emitted from the reflecting surface 13 is large in the vertical direction, with a peak angle of ω = 73°. The light emitted from the emitting surface is emitted at a small angle, with a peak angle of θ = 0° in the vertical field of view and a full field of view of 33°. The light emission ratio of the entire emitting surface 12 and the reflecting surface 13 is 9:1; the light energy splitting ratio at the front field of view is approximately 22:1.

[0220] Example 4:

[0221] As described in Example 1, please refer to Figure 21 When the morphology of the first microstructure 2 can be as follows Figure 21When a 1 / 8 cylinder is shown, α ranges from 32.5 to 50°, depth h ranges from 2 to 20 μm, and the radius of curvature of the cylinder ranges from 5 to 30 μm. Specifically, for example, when α = 42°, depth h = μm, and the radius of curvature of the cylinder R = 18 μm, the light guide plate substrate PC has a thickness T = 0.4 mm. For a high-resolution light guide plate with the first microstructure 2 having the above morphology, when light is coupled in from the incident surface 11, the relationship between the light energy emitted from the reflecting surface 13 and the emitting surface 12 and the field of view is as follows: Figure 22 As shown.

[0222] like Figure 22 As shown, the peak angle of the light emitted from the reflective surface 13 is large in the vertical direction (the direction of light propagation within the light guide plate), with a peak angle of ω = 73°. The light energy emitted from the light-emitting surface is emitted at a small angle, with a peak angle of θ = 0.9° in the vertical field of view and a half-peak width of 34° across the entire field of view. The light emission ratio of the entire light-emitting surface 12 and the reflective surface 13 is 8.5:1; the light energy splitting ratio at the front field of view is 20:1.

[0223] Example 5:

[0224] As described in Example 1, please refer to Figure 23 When the morphology of the second microstructure 3 can be as follows Figure 23 The 1 / 2 cylindrical structure shown differs from the horizontally placed 1 / 2 cylindrical structure in Embodiment 2. In this embodiment, the depth h ranges from 2µm to 20µm, the cylindrical radius of curvature R ranges from 5µm to 30µm, and the width w ranges from 32.5° to 50°.

[0225] Specifically, for example, when R = 15 μm, depth h = 9 μm, w = 20 μm, and the light guide plate substrate is PC with a thickness T = 0.4 mm, the high beam-splitting ratio light guide plate with the first microstructure 2 having the above morphology, when light is coupled in from the incident surface 11, the relationship between the light energy emitted from the reflecting surface 13 and the emitting surface 12 and the field of view is as follows: Figure 24 As shown.

[0226] like Figure 24 As shown, the peak emission angle of the reflective surface 13 is large in the vertical direction (the direction of light propagation within the light guide plate), with an emission angle peak angle of ω = 71° and a full field-of-view half-width of 98°. The light emitting surface emits energy at a small angle, with an emission energy peak angle of θ = 22.5° in the vertical direction and a full field-of-view half-width of 98°. The overall emission ratio of the light emitting surface 12 and the reflective surface 13 is 2.5:1; the emission energy at the front field of view is relatively large. Due to the large emission angle peak width, the hot spot effect of the LED at the incident light point can be effectively reduced.

[0227] Example 6:

[0228] Please refer to Figure 25 When the morphology of the second microstructure 3 can be as follows Figure 25 In the spherical cap structure shown, the depth h ranges from 2um to 20um, and the cylindrical radius of curvature R ranges from 5um to 30um.

[0229] Specifically, for example, R = 15µm, depth 9µm, light guide plate substrate PC, thickness T = 0.4mm. The high beam-splitting ratio light guide plate with the second microstructure 3 having the above morphology, when light is coupled in from the incident surface 11, the relationship between the light energy emitted from the reflecting surface 13 and the emitting surface 12 and the field of view is as follows: Figure 26 As shown.

[0230] like Figure 26 As shown, the peak angle of the light emitted from the reflective surface 13 is large in the vertical direction (the direction of light propagation within the light guide plate), with a peak angle of ω = 75° and a half-width at half-maximum (WHM) of 167° across the entire field of view. The effective peak angle of the light emitted from the light-emitting surface 12 is θ = 31.5° in the vertical direction, with a WHM of 98° across the entire field of view. Due to the large peak width of the emission angle, the hot spot effect of the LED at the incident light point can be effectively reduced.

[0231] Compared with existing technologies, the first microstructure provided in this application can effectively control the light emission angle of the light guide plate and the beam splitting ratio of the upper and lower surfaces of the light guide plate. This allows the light emission ratio of the effective light-emitting surface to the ineffective reflective surface of the light guide plate to be approximately 10:1. Simultaneously, by adjusting the direction of the light emitted from the effective light-emitting surface and the ineffective reflective surface, the peak angle of the light emitted from the effective light-emitting surface can be between 0° and 20°, while the peak angle of the light emitted from the ineffective light-emitting surface can be greater than 50°. This effectively increases the light energy entering the display panel, improving not only the energy utilization rate of the light source but also the contrast of the reflective liquid crystal display device, especially the contrast of the front field. The sloped first microstructure has high light guiding efficiency. By setting a low-density first microstructure near the light inlet and adding a smaller, recessed second microstructure (which has lower light guiding efficiency and a wider emission direction distribution), combined with the first microstructure, the hot spots or light spots near the LED strips of the front light module can be effectively reduced, improving the display quality.

[0232] Example for reference:

[0233] In this reference example, when the angle α between the inclined plane 21 and the reflecting surface 13 is changed to a range outside the angle range of 27.5°-57.5°, the relationship between the angle α values ​​of different inclined plane 21 and reflecting surface 13 and the beam splitting ratio and light emission angle is shown in Table 2 below:

[0234] Table 2. Relationship between the angle value of the first microstructure and the spectrophotometric ratio and light emission angle.

[0235]

[0236] According to Table 2 above, when the angle α between the inclined surface 21 and the reflecting surface 13 is within the angle range of 15-25° and 65°-75°, the beam splitting ratio of the light guide plate is less than 4:1.

[0237] Further, please refer to Figures 27A to 27D The diagram illustrates the relationship between the effective and ineffective light output of the high-resolution light guide plate and the field of view when the angle α between the inclined plane 21 and the reflecting surface 13 is given; where, in Figure 27A In the middle, α = 15°; in Figure 27B In the middle, α = 20°; in Figure 27C In the middle, α = 70°; in Figure 27D In this case, α = 75°.

[0238] according to Figure 27A and Figure 27B It can be seen that when α = 15° or 20°, the effective light output peak angle of the high beam ratio light guide plate is greater than 30°, while in the field of view range of -5° to 25°, its light output intensity is almost 0, which cannot meet the requirements for the use of reflective liquid crystal displays.

[0239] according to Figure 27C and Figure 27D It can be seen that when α = 70° or 75°, the effective light output peak angle of the high beam ratio light guide plate is outside -30°, and its light output intensity is very weak in the range of -5° to 25° in the front field of view, which cannot meet the requirements of reflective liquid crystal displays.

[0240] In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0241] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0242] Where there is no conflict, the embodiments and features described above can be combined with each other. The above descriptions are merely preferred embodiments of the present invention and are not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high beam splitting ratio light guide plate, characterized in that, Applied to the light-emitting side of a reflective liquid crystal display panel, including: The light guide plate body includes a light incident surface, a light emitting surface, and a reflective surface, wherein the light incident surface and the light emitting surface are arranged opposite to each other, and the light incident surface is respectively connected to the reflective surface and the light emitting surface; Multiple first microstructures are recessed inwardly on the reflective surface. Each first microstructure includes an inclined surface facing the light-incident surface. The angle between the inclined surface and the reflective surface ranges from 27.5° to 57.5°, so that the ratio of the effective light-emitting energy of the light-emitting surface of the high-resolution light guide plate to the ineffective light-emitting energy of the reflective surface is between 5:1 and 10:1, and the ratio of the effective light-emitting energy of the light-emitting surface to the ineffective light-emitting energy of the reflective surface of the high-resolution light guide plate in the frontal field of view is between 10:1 and 22:

1. Multiple second microstructures are recessed inwardly on the reflective surface, and each second microstructure includes an arc surface facing the light incident surface. The first spacing between any two adjacent first microstructures decreases as the first average distance from the two adjacent first microstructures to the incident light surface increases, and the first spacing and the first average distance satisfy an exponential function relationship with the first average distance as the independent variable and the first spacing as the dependent variable. Multiple second microstructures are disposed in a preset area, which is a region on the reflective surface from the light-incident surface to 1 / 3-1 / 2 away from the light-incident surface. Within the preset area, the distribution density of the second microstructures gradually decreases from the light-incident surface to the direction away from the light-incident surface.

2. The high beam splitting ratio light guide plate according to claim 1, characterized in that, The angle between the inclined surface of the first microstructure and the reflective surface is 32.5°-45°.

3. The high beam splitting ratio light guide plate according to claim 1, characterized in that, The first microstructure is one or more of the following: a pyramid, a prism, a partial sphere, and a partial cylinder.

4. The high beam splitting ratio light guide plate according to claim 1, characterized in that, The inclined surface of the first microstructure is an optically smooth surface with a roughness Ra of 30 nm to 150 nm.

5. The high beam splitting ratio light guide plate according to claim 1, characterized in that, The second microstructure is one or more of the following: hemispherical, cylindrical, teardrop-shaped, and horseshoe-shaped.

6. The high beam splitting ratio light guide plate according to claim 1, characterized in that, The length and width of the first microstructure both range from 10um to 40um.

7. The high beam splitting ratio light guide plate according to claim 1, characterized in that, The depth of the first microstructure ranges from 3um to 20um.

8. The high beam splitting ratio light guide plate according to claim 1, characterized in that, The length and width of the second microstructure both range from 5um to 20um.

9. The high beam splitting ratio light guide plate according to claim 1, characterized in that, The depth range of the second microstructure is 3um-15um.

10. The high beam splitting ratio light guide plate according to claim 1, characterized in that, The second spacing between any two adjacent second microstructures increases as the second average distance from the two adjacent second microstructures to the incident light surface increases, and the second spacing and the average distance satisfy an exponential function relationship with the second average distance as the independent variable and the second spacing as the dependent variable.

11. The high beam splitting ratio light guide plate according to claim 1, characterized in that, A V-shaped prism structure is provided on the light-incident surface.

12. The high beam splitting ratio light guide plate according to claim 11, characterized in that, The V-shaped prism structure is a prism body, a cylindrical lens body, or a combination of a prism body and a cylindrical lens.

13. A method for preparing a high-resolution light guide plate, characterized in that, The method for preparing the high beam ratio light guide plate as described in any one of claims 1-12 includes: A light guide plate body is provided, the light guide plate body including a light incident surface and a reflective surface; Provide a light guide plate mold core; Multiple first microstructures are formed on the reflective surface of the light guide plate body using nanoimprinting using the light guide plate mold core. Each first microstructure includes an inclined surface facing the light incident surface, and the angle between the inclined surface and the reflective surface ranges from 27.5° to 57.5°.

14. The method for preparing a high beam ratio light guide plate according to claim 13, characterized in that, Also includes: Multiple second microstructures are formed on the reflective surface of the light guide plate body using nanoimprinting using the light guide plate mold core. Each second microstructure includes an arc surface facing the light incident surface.

15. The method for preparing a high beam ratio light guide plate according to claim 14, characterized in that, The process involves using the light guide plate mold core to form multiple first microstructures on the reflective surface of the light guide plate body via nanoimprinting, including: Multiple first microstructures are formed on the reflective surface of the light guide plate body by photopolymerization using the light guide plate mold core. And / or, The process involves using the light guide plate mold core to form multiple second microstructures on the reflective surface of the light guide plate body via nanoimprinting, including: Multiple second microstructures are formed on the reflective surface of the light guide plate body using the light guide plate mold core through photopolymerization molding.

16. The method for preparing a high beam ratio light guide plate according to claim 14, characterized in that, The process involves using the light guide plate mold core to form multiple first microstructures on the reflective surface of the light guide plate body via nanoimprinting, including: Multiple first microstructures are formed on the reflective surface of the light guide plate body using the aforementioned light guide plate mold core through hot pressing; and / or, The process involves using the light guide plate mold core to form multiple second microstructures on the reflective surface of the light guide plate body via nanoimprinting, including: Multiple second microstructures are formed on the reflective surface of the light guide plate body using the light guide plate mold core through photopolymerization molding.

17. The method for preparing a high beam ratio light guide plate according to claim 14, characterized in that, The provision of a light guide plate mold core includes: Provide a substrate; A plurality of first recesses and / or a plurality of second recesses are formed on the substrate to obtain a mold master, wherein the outline of the first recess is the same as the outline of the first microstructure, and the outline of the second recess is the same as the outline of the second microstructure. The master mold is subjected to metal growth and separation from the original mold to obtain the light guide plate mold core.

18. The method for preparing a high beam ratio light guide plate according to claim 17, characterized in that, The step of forming a plurality of first recesses and / or a plurality of second recesses on the substrate to obtain a mold master plate includes: Multiple first pits and / or multiple second pits are formed on the substrate by 3D grayscale photolithography to obtain the mold master.

19. The method for preparing a high beam ratio light guide plate according to claim 17, characterized in that, The step of forming a plurality of first recesses and / or a plurality of second recesses on the substrate to obtain a mold master plate includes: Multiple first pits and / or multiple second pits are formed on the substrate by laser direct writing to obtain the mold master.

20. The method for preparing a high beam ratio light guide plate according to claim 17, characterized in that, The step of forming a plurality of first recesses and / or a plurality of second recesses on the substrate to obtain a mold master plate includes: The mold master is obtained by using a die head to move relative to the substrate to form a plurality of first recesses and / or a plurality of second recesses on the substrate.

21. A light source module, characterized in that, It includes a high beam ratio light guide plate as described in any one of claims 1-12 and a light source located on one side of the light incident surface of the high beam ratio light guide plate.

22. A display component, characterized in that, It includes the light source module and the reflective liquid crystal display panel as described in claim 21, wherein the light source module is located on the light-emitting side of the reflective liquid crystal display panel.

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