Light guide plate, backlight module and display device

Abstract

A light guide plate (2), a backlight module and a display device. The light guide plate (2) comprises a substrate (3) and lattice points (4), the lattice points (4) are arranged on the reflecting surface (6), the cross section, parallel to the light incident surface (5), of each lattice point (4) is set to be a first cross section, and the size of the first cross section in the third direction (Y direction) is set to be linearly reduced in the direction away from the reflecting surface (6); each lattice point (4) comprises a first end face (14) and a second end face (15), the first end face (14) and the second end face (15) are located at the two ends of the lattice point (4) in the third direction (Y direction) respectively, each of the first end face (14) and the second end face (15) comprises at least one inclined face (11), and the plane where the inclined faces (11) are located intersects with the first plane (16) and the reflection plane (6) respectively. The light guide plate (2) can improve the brightness, improve the light conversion rate, and meet the brightness uniformity at the same time.

Description

Light guide plate, backlight module and display device TECHNICAL FIELD

[0001] The present disclosure relates to, but is not limited to, the technical field of display, and in particular to a light guide plate, a backlight module and a display device. BACKGROUND

[0002] Liquid Crystal Display (LCD) has the characteristics of small volume, low power consumption, no radiation, etc., and has developed rapidly. Backlight module is an important part of LCD, which can provide light source for LCD, and the backlight module also includes a light guide plate for guiding light.

[0003] At present, the light utilization rate of the light guide plate is poor, and the contribution to the brightness improvement is low.

[0004] SUMMARY

[0005] The following is a summary of the subject matter of the detailed description herein. This summary is not intended to limit the scope of the claims.

[0006] The embodiment of the present disclosure provides a light guide plate, which comprises:

[0007] a substrate, the substrate has a light-in surface and a reflection surface, the reflection surface is located at one end of the substrate in a first direction, the light-in surface is located at one end of the substrate in a second direction, the first direction is perpendicular to the substrate, and the second direction is perpendicular to the first direction;

[0008] a dot, the dot is arranged on the reflection surface, a cross section of the dot arranged parallel to the light-in surface is a first cross section, a size of the first cross section in a third direction is arranged to linearly decrease in a direction away from the reflection surface, and the third direction is parallel to the light-in surface and perpendicular to the first direction;

[0009] the dot comprises a first end surface and a second end surface, the first end surface and the second end surface are respectively located at two ends of the dot in the third direction, the first end surface and the second end surface both comprise at least one inclined surface, planes where the inclined surfaces are arranged to respectively intersect with a first plane and the reflection surface, and the first plane is arranged to be perpendicular to the reflection surface and the light-in surface.

[0010] In some example embodiments, the dot further comprises a third inclined surface and a fourth inclined surface, the third inclined surface is located on a side of the dot close to the light-in surface in the second direction, the fourth inclined surface is located on a side of the dot away from the light-in surface in the second direction, and planes where the third inclined surface and the fourth inclined surface are arranged to intersect with the light-in surface;

[0011] A distance between the third inclined surface and the fourth inclined surface is arranged to linearly decrease along a direction away from the reflecting surface.

[0012] In some example embodiments, two inclined surfaces are arranged, including a first inclined surface and a second inclined surface, the first inclined surface is located on a side of the second inclined surface close to the light-incident surface;

[0013] An edge of the first inclined surface close to the light-incident surface is connected to an end of the third inclined surface in the third direction, and an edge of the second inclined surface away from the light-incident surface is connected to an end of the fourth inclined surface in the third direction;

[0014] An edge of the first inclined surface away from the third inclined surface is arranged to be correspondingly connected to an edge of the second inclined surface away from the fourth inclined surface.

[0015] In some example embodiments, the mesh point is arranged as a triangle in a cross section parallel to the first plane, an end of the third inclined surface away from the reflecting surface and an end of the fourth inclined surface away from the reflecting surface are connected and form a second intersection line at the connection position;

[0016] The connection position of the first inclined surface and the second inclined surface forms a first intersection line;

[0017] One end of the first intersection line and one end of the second intersection line are connected, the other end of the first intersection line extends to the reflecting surface, and both the first intersection line and the second intersection line are parallel to the light-incident surface.

[0018] In some example embodiments, an angle between a plane where the third inclined surface is located and the reflecting surface is a first angle, and an angle between a plane where the fourth inclined surface is located and the reflecting surface is a second angle, the first angle is arranged to be greater than the second angle.

[0019] In some example embodiments, the first angle is arranged to be 40° to 60°, and the second angle is arranged to be 20° to 40°.

[0020] In some example embodiments, the first angle is arranged to be 40°, and the second angle is arranged to be 20°.

[0021] In some example embodiments, the first cross section is arranged as a trapezoid, the first cross section includes a first edge and a second edge respectively located at two ends of the third direction, an angle between the first edge and a plane where the reflecting surface is located is a third angle, and the third angle is arranged to be 40° to 60°;

[0022] An angle between the second edge and the plane where the reflecting surface is located is a fourth angle, and the fourth angle is arranged to be 40° to 60°.

[0023] In some example embodiments, the third and fourth angles are equal in value and are each 40°.

[0024] In some example embodiments, the net dot is set as a hexagon in the orthogonal projection on the light-exiting surface, the maximum size of the net dot in the first direction is H, the maximum size of the net dot in the second direction is W, and the maximum size of the net dot in the third direction is set as L, the light-exiting surface is located on the side of the substrate away from the reflecting surface, and L:W:H=(145-165):(65-85):(10-20).

[0025] In some example embodiments, L:W:H=155:75:15.

[0026] In some example embodiments, the net dot is set as a hexagon in the orthogonal projection on the light-exiting surface, the maximum size of the net dot in the first direction is H, the maximum size of the net dot in the second direction is W, and the maximum size of the net dot in the third direction is set as L, the light-exiting surface is located on the side of the substrate away from the reflecting surface, and L:W:H=(145-165):(65-85):(10-20).

[0027] In some example embodiments, L:W:H=155:75:15.

[0028] In some example embodiments, the density of the net dot on the reflecting surface is set to gradually increase along the direction away from the light-entering surface.

[0029] In some example embodiments, the net dot is set as a groove structure formed by recessing the reflecting surface or a convex structure protruding from the reflecting surface.

[0030] In some example embodiments, further comprising transparent microparticles, the transparent microparticles are arranged in the substrate, and the refractive index of the transparent microparticles is greater than the refractive index of the substrate.

[0031] In some example embodiments, the refractive index of the transparent microparticles is set as N1, the refractive index of the substrate is set as N2, and N1=N2+0.01.

[0032] In some example embodiments, the diameter of the transparent microparticles is set to 1um to 10um.

[0033] In some example embodiments, the diameter of the transparent microparticles is set to 4um.

[0034] In some example embodiments, the substrate includes a microparticle region and a first region in the first direction, the microparticle region is arranged on the side of the first region close to the reflecting surface, and the transparent microparticles are arranged in the microparticle region.

[0035] In some example embodiments, the ratio of the size of the microparticle region in the first direction to the size of the substrate in the first direction is set to 0.01 to 0.1.

[0036] The backlight module according to the present disclosure is provided.

[0037] The display device according to the present disclosure is provided.

[0038] Other aspects can become apparent from the following detailed description, when taken in conjunction with the accompanying drawings, which together with the detailed description, illustrate the principles of the disclosure.

[0039] SUMMARY

[0040] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure, but are not intended to limit the present disclosure.

[0041] FIG. 1 is a schematic diagram of a related backlight module;

[0042] FIG. 2 is a schematic diagram of a backlight module according to an example embodiment;

[0043] FIG. 3 is a schematic diagram of a cross-section along A-A in FIG. 2;

[0044] FIG. 4 is a schematic diagram of a cross-section along B-B in FIG. 2;

[0045] FIG. 5 is a schematic diagram of a partial view of a light guide plate according to an example embodiment;

[0046] FIG. 6 is a schematic diagram of a structure of the light guide plate in FIG. 2;

[0047] FIG. 7 is a schematic diagram of a partial cross-section of the light guide plate in FIG. 2;

[0048] FIG. 8 is a schematic diagram of a cross-section along C-C in FIG. 2;

[0049] FIG. 9 is a graph of a relationship between a first included angle and luminance according to an example embodiment;

[0050] FIG. 10 is a graph of a relationship between a second included angle and luminance according to an example embodiment;

[0051] FIG. 11 is a graph of a relationship between a dot size and luminance according to an example embodiment;

[0052] FIG. 12 is a first schematic diagram of light propagation in a light guide plate according to an example embodiment;

[0053] FIG. 13 is a second schematic diagram of light propagation in a light guide plate according to an example embodiment;

[0054] Figure 14 is a contrast diagram of brightness test data of the present exemplary embodiment;

[0055] Figure 15 is another schematic diagram of a backlight module of the present exemplary embodiment;

[0056] Figure 16 is a partial cross-sectional view of the light guide plate in Figure 15;

[0057] Figure 17 is another schematic diagram of a light guide plate of the present exemplary embodiment;

[0058] Figure 18 is a D-D cross-sectional view of the light guide plate in Figure 17;

[0059] Figure 19 is an E-E cross-sectional view of the light guide plate in Figure 17;

[0060] Figure 20 is a test data diagram of the light guide plate in Figure 17;

[0061] Figure 21 is another schematic diagram of a light guide plate of the present exemplary embodiment;

[0062] Figure 22 is a partial schematic diagram of the light guide plate in Figure 21;

[0063] Figure 23 is a simulation contrast experimental data diagram of the light guide plate of the present exemplary embodiment;

[0064] Figure 24 is an optical test point diagram of the light guide plate in Figure 21.

[0065] Explanation of reference numerals: 1-LED lamp; 2-light guide plate; 3-substrate; 4-dot; 5-light inlet surface; 6-reflective surface; 7-light outlet surface; 8-distant light surface; 9-third inclined surface; 10-fourth inclined surface; 11-inclined surface; 12-first inclined surface; 13-second inclined surface; 14-first end surface; 15-second end surface; 16-first flat surface; 17-first side surface; 18-first groove; 19-second intersection line; 20-first intersection line; 21-third intersection line; 22-fourth intersection line; 23-fifth intersection line; 24-sixth intersection line; 25-seventh intersection line; 26-eighth intersection line; 27-first rim; 28-second rim; 29-first protrusion; 30-transparent fine particle; 31-prism microstructure.

[0066] Detailed description

[0067] For the purpose of making the object, technical solutions and advantages of the present disclosure clearer, the following will describe the embodiments of the present disclosure in detail with reference to the drawings. Note that the embodiments can be implemented in a variety of different forms. One of ordinary skill in the art can easily understand that the means and content can be changed into various forms without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be interpreted as being limited to the content described in the following embodiments. The embodiments in the present disclosure and the features in the embodiments can be combined with each other as long as there is no conflict.

[0068] The scale of the drawings in the present disclosure can be used as a reference in the actual process, but is not limited thereto. For example, the width-length ratio of the channel, the thickness and interval of each film layer, and the width and interval of each signal line can be adjusted according to actual needs. The number of pixels in the display panel and the number of sub-pixels in each pixel are not limited to the number shown in the drawings. The drawings described in the present disclosure are only schematic structural diagrams, and one embodiment of the present disclosure is not limited to the shapes or values shown in the drawings.

[0069] In the present specification, ordinal terms, such as "first", "second", and "third", are used to avoid confusion among constituent elements and are not intended to constitute limitation in terms of numbers.

[0070] In the present specification, words of apositional relation or positional relation such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like are used to describe the positional relation of constituent elements with reference to the drawings for the convenience of explanation and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting on the present disclosure. The positional relation of the constituent elements is appropriately changed according to the direction in which each constituent element is described. Therefore, it is not limited to the words described in the specification, and can be appropriately changed according to the situation.

[0071] In the present specification, unless explicitly defined and limited otherwise, the terms "mount", "connected", and "linked" are to be interpreted broadly. For example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection via an intermediate element, or communication inside two elements. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art according to the specific circumstances.

[0072] In the present specification, "electrically connected" includes the case where the constituent elements are connected together through an element having some electrical effect. The element having some electrical effect is not particularly limited as long as it can perform the transmission and reception of electrical signals between the connected constituent elements. Examples of the element having some electrical effect include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, other elements having various functions, and the like.

[0073] In the present specification, "parallel" means a state in which the angle formed by two straight lines is -10° or more and 10° or less, and thus also includes a state in which the angle is -5° or more and 5° or less. In addition, "perpendicular" means a state in which the angle formed by two straight lines is 80° or more and 100° or less, and thus also includes a state in which the angle is 85° or more and 95° or less.

[0074] In the present specification, "film" and "layer" can be replaced with each other. For example, "conductive layer" can be replaced with "conductive film". Similarly, "insulating film" can be replaced with "insulating layer".

[0075] In the present specification, a triangle, a rectangle, a trapezoid, a pentagon, or a hexagon, etc. are not strictly defined, and can be an approximate triangle, rectangle, trapezoid, pentagon, or hexagon, etc. There can be some small deformations due to tolerances, and there can be guide angles, arc edges, and deformations, etc.

[0076] In the present disclosure, “about” means that the limit is not strictly defined, and values within the range of process and measurement errors are allowed.

[0077] In the present disclosure, the light conversion rate of the light guide plate refers to the ratio of the light energy emitted from the light exit surface of the light guide plate to the light energy incident from the light entrance surface of the light guide plate.

[0078] FIG. 1 is a schematic diagram of a related backlight module. Currently, some backlight module products can use a side-in light source, i.e., an LED (Light-Emitting Diode) lamp 1 is placed on the side of a light guide plate (LGP) 2. The light guide plate 2 can process a raised or recessed dot 3 on the lower surface by ink printing / heat pressing / laser, etc. The dot 3 uses diffuse reflection to break total reflection, so that the light of the LED lamp 1 changes from a linear light source to a surface light source. However, from the perspective of light distribution, most of the light emitted from the light guide plate 2 is concentrated at a large viewing angle rather than a medium or small viewing angle, the light utilization rate is low, and the brightness is low. Therefore, multiple diffusion and prism films are needed to correct the light distribution angle and improve the brightness. At the same time, display devices need to meet various standards that are constantly upgraded, such as ES9.0, ErP lot5, and HDR600 / 1000 / 1400, etc. ES9.0 is an energy efficiency standard for televisions. ErP lot5 refers to the energy consumption standard for television products in the European Union's Energy-related Products Directive (ErP), also known as EC 642 / 2009. HDR600 / 1000 / 1400 is a different level standard for the high dynamic range (HDR) supported by a display or television. Currently, the requirements for brightness and light conversion efficiency of the backlight module under the same current and energy are getting higher and higher. Even if high-cost brightening films such as DBEF are used, it is still difficult to further improve the brightness and light utilization rate. DBEF is a high-performance optical film, and its full name is Dual Brightness Enhancing Film. Therefore, the backlight module needs to improve the light conversion rate and brightness of the light guide plate.

[0079] Figure 2 is a schematic diagram of a backlight module according to an example embodiment, Figure 3 is a schematic diagram of a cross-section along A-A in Figure 2, Figure 4 is a schematic diagram of a cross-section along B-B in Figure 2, and Figure 5 is a schematic diagram of a light guide plate according to an example embodiment. The example embodiment provides a light guide plate, as shown in Figures 2 to 4, the light guide plate 2 can include a substrate 3 and a dot 4. The substrate 3 can have a light-incident surface 5 and a reflecting surface 6. The reflecting surface 6 can be located at one end of the substrate 3 in a first direction (Z direction). The light-incident surface 5 can be located at one end of the substrate 3 in a second direction (X direction). The first direction (Z direction) can be perpendicular to the substrate 3. The second direction (X direction) can be perpendicular to the first direction (Z direction). The dot 4 can be disposed on the reflecting surface 6. A cross-section of the dot 4 parallel to the light-incident surface 5 is a first cross-section. A dimension (S) of the first cross-section in a third direction can be linearly reduced in a direction away from the reflecting surface 6. The third direction can be parallel to the light-incident surface 5 and perpendicular to the first direction (Z direction). The dot 4 can include a first end surface 14 and a second end surface 15. The first end surface 14 and the second end surface 15 can be located at two ends of the dot 4 in the third direction, respectively. The first end surface 14 and the second end surface 15 can each include at least one inclined surface 11. A plane of the inclined surface 11 can be arranged to intersect a first plane 16 and the reflecting surface 6, respectively. The first plane 16 can be arranged to be perpendicular to the reflecting surface 6 and the light-incident surface 5. Thus, the inclined surface 11 is not parallel to the first plane 16 and not parallel to the reflecting surface 6. The inclined surface 11 can reflect a component of light propagating parallel to the third direction towards a light- emitting surface 7 and emit the light perpendicularly at a small angle out of the light guide plate. As a result, the light conversion efficiency is improved and the brightness of the light guide plate is increased.

[0080] Figure 6 is a schematic diagram of the structure of the light guide plate in Figure 2, and Figure 7 is a schematic diagram of a partial cross-section of the light guide plate in Figure 2. In some example embodiments, as shown in Figures 3, 5, 6 and 7, the substrate 3 can be a rectangular plate. The substrate 3 can be arranged perpendicular to the first direction (Z direction). A surface of the substrate 3 can include the reflecting surface 6 and the light-emitting surface 7 located at two ends of the substrate 3 in the first direction (Z direction), respectively. The surface of the substrate 3 can also include the light-incident surface 5 and a far light surface 8 located at two ends of the substrate 3 in the second direction (X direction), respectively. The surface of the substrate 3 can further include two first side surfaces 17 located at two ends of the substrate 3 in the third direction (Y direction), respectively. The reflecting surface 6 and the light-emitting surface 7 can be parallel to each other and both perpendicular to the first direction (Z direction). The light-incident surface 5 and the far light surface 8 can be parallel to each other and both perpendicular to the second direction (X direction). The two first side surfaces 17 can be parallel to each other and both perpendicular to the third direction (Y direction). The light-incident surface 5 can be perpendicular to the reflecting surface 6 and the light-emitting surface 7. The first plane 16 described above can be perpendicular to the light-incident surface 5 and the reflecting surface 6 and parallel to the first side surface 17.

[0081] In some example embodiments, as shown in FIG. 2 and FIG. 3, the LED lamp 1 can be a light bar extending in the third direction (Y direction), and the LED lamp 1 can be arranged to directly irradiate the light-incident surface 5, so that the light emitted by the LED lamp 1 is incident into the light guide plate 2 through the light-incident surface 5, and the LED lamp 1 serves as a side-incident light source. The LED lamp 1 can be arranged on one side of the light guide plate 2 in the second direction (X direction), and the light beam entering the light guide plate 2 has a component parallel to the third direction (Y direction). The reflective surface 6 of the substrate 3 can reflect the light to the light- emitting surface 7, and finally the light can exit the light guide plate 2 through the light- emitting surface 7.

[0082] In some example embodiments, as shown in FIG. 2 to FIG. 7, the dot 4 can be a groove structure recessed from the reflective surface 6 to the light-emitting surface 7, and the dot 4 constitutes a first groove 18. The dot 4 is arranged such that the surface of the reflective surface 6 of the substrate 1 is uneven. The first end surface 14 and the second end surface 15 are both side walls of the first groove 18. The first end surface 14 can be a side wall at one end of the first groove 18 in the third direction (Y direction), and the second end surface 15 can be a side wall at the other end of the first groove 18 in the third direction (Y direction). The dot 4 is formed by hot pressing, or point impact, or laser, or injection molding of the reflective surface 6 of the substrate 3 using a mold to process the plate material. In order to reduce production cost, the dot 4 of the present example uses hot pressing processing.

[0083] Figure 8 is a C-C cross-sectional view of Figure 2, in some example embodiments, as shown in Figures 2-8, the mesh point 4 further comprises a third inclined surface 9 and a fourth inclined surface 10, both of which are planar, but are not limited thereto, for example, can be curved. The third inclined surface 9 is located on the side of the mesh point 4 in the second direction (X direction) close to the light-incident surface 5, and the fourth inclined surface 10 is located on the side of the mesh point 4 in the second direction (X direction) away from the light-incident surface 5, both the plane on which the third inclined surface 9 is located and the plane on which the fourth inclined surface 10 is located are arranged to intersect the light-incident surface 5, that is, neither the third inclined surface 9 nor the fourth inclined surface 10 is parallel to the light-incident surface 5. Both the third inclined surface 9 and the fourth inclined surface 10 are the groove side walls of the first groove 18, the third inclined surface 9 can be the side wall of the first groove 18 at one end in the second direction (X direction), and the fourth inclined surface 10 can be the side wall of the first groove 18 at the other end in the second direction (X direction). The first end surface 14, the second end surface 15, the third inclined surface 9, and the fourth inclined surface 10 constitute the groove walls of the first groove 18. Both the plane on which the third inclined surface 9 is located and the plane on which the fourth inclined surface 10 are perpendicular to the first side surface 17, both the third inclined surface 9 and the fourth inclined surface 10 intersect the reflective surface 6 at one end in the first direction (Z direction), and the third inclined surface 9 intersects the fourth inclined surface 10 at the other end in the first direction (Z direction). The intersection position of the third inclined surface 9 and the fourth inclined surface 10 forms a second intersection line 19, the second intersection line 19 can be perpendicular to the first side surface 17, the extension direction of the second intersection line 19 can be consistent with the third direction (Y direction), and the second intersection line 19 can be parallel to the light-incident surface 5, the reflective surface 6, and the light-incident surface 7. The intersection position of the third inclined surface 9 and the reflective surface 6 forms a fifth intersection line 23, the fifth intersection line 23 is parallel to the light-incident surface 7 and the light-incident surface 5; the intersection position of the fourth inclined surface 10 and the reflective surface 6 forms a sixth intersection line 24, the sixth intersection line 24 is parallel to the light-incident surface 7 and the light-incident surface 5. The third inclined surface 9 and the fourth inclined surface 10 form a "chevron" shape, so that the distance between the third inclined surface 9 and the fourth inclined surface 10 decreases linearly in the direction away from the reflective surface 6 along the first direction (Z direction), and the distance between the third inclined surface 9 and the fourth inclined surface 10 can be the spacing of the third inclined surface 9 and the fourth inclined surface 10 in the second direction (X direction). The third inclined surface 9 and the fourth inclined surface 10 are both rectangular in orthographic projection on the light-incident surface 7.

[0084] In some example embodiments, as shown in FIGS. 2-8, the first end surface 14 and the second end surface 15 can each include two bevels 11, which can include a first bevel 12 and a second bevel 13. The first bevel 12 can be located on a side of the second bevel 13 closer to the light-incident surface 5, and the second bevel 13 can be located on a side of the first bevel 12 closer to the light- exit surface 7. The first bevel 12 can intersect with the light-incident surface 5, the reflective surface 6, and the first plane 16, none of which is perpendicular to the first bevel 12. An end of the first bevel 12 away from the light- exit surface 7 can intersect with the reflective surface 6, and the intersection can form a seventh intersection line 25. An end of the second bevel 13 away from the light- exit surface 7 can intersect with the reflective surface 6, and the intersection can form an eighth intersection line 26. One end of the seventh intersection line 25 can connect to one end of the eighth intersection line 26, another end of the seventh intersection line 25 can connect to an end of the fifth intersection line 23, and another end of the eighth intersection line 26 can connect to an end of the sixth intersection line 24. Thus, the fifth intersection line 23, the sixth intersection line 24, the two seventh intersection lines 25, and the two eighth intersection lines 26 can enclose the slot opening of the first recess 18.

[0085] In some example embodiments, as shown in FIGS. 2-8, the first bevel 12 can be a triangular plane, and the seventh intersection line 25 can be one side of the triangle formed by the first bevel 12. An end of the first bevel 12 closer to the light-incident surface 5 can connect to an end of the third bevel 9 in the third direction, and the connection can form a third intersection line 21, which can be another side of the triangle formed by the first bevel 12. An end of the first bevel 12 away from the third bevel 9 can correspondingly connect to an end of the second bevel 13 away from the fourth bevel 10, and the connection of the first bevel 12 and the second bevel 13 can form a first intersection line 20, which can be yet another side of the triangle formed by the first bevel 12. Thus, the first intersection line 20, the third intersection line 21, and the seventh intersection line 25 can connect end to end to enclose a circumferential edge of the first bevel 12. A projection of the first bevel 12 on the light- exit surface 7 can adjoin but not overlap a projection of the third bevel 9 on the light- exit surface 7.

[0086] In some example embodiments, as shown in FIGS. 2-8, the second inclined surface 13 can be a triangular plane, and the eighth intersection line 26 can be one side of the triangle formed by the second inclined surface 13. The side of the second inclined surface 13 away from the light-incident surface 5 can be connected to one end of the fourth inclined surface 10 in the third direction, and the connection position forms a fourth intersection line 22, which can be another side of the triangle formed by the second inclined surface 13. The side of the second inclined surface 13 away from the fourth inclined surface 10 can be connected to the first inclined surface 12, and the connection position of the first inclined surface 12 and the second inclined surface 13 forms a first intersection line 20, which can be the third side of the triangle formed by the second inclined surface 13. Thus, the first intersection line 20, the fourth intersection line 22, and the eighth intersection line 26 are connected end to end to form the circumferential edge of the second inclined surface 13. The orthogonal projection of the second inclined surface 13 on the light-exit surface 7 is connected to but does not overlap with the orthogonal projection of the fourth inclined surface 10 on the light-exit surface 7. The third intersection line 21 and the fourth intersection line 22 are both connected to one end of the second intersection line 19 in the third direction, and the third intersection line 21 and the fourth intersection line 22 are both parallel to the first plane 17.

[0087] In some example embodiments, as shown in FIGS. 2-8, one end of the first intersection line 20 can be connected to one end of the second intersection line 19, the other end of the first intersection line 20 can extend to the reflective surface 6, the first intersection line 20 and the second intersection line 19 are both parallel to the light-incident surface 5, and the orthogonal projection of the first intersection line 20 on the light-exit surface 7 is collinear with the orthogonal projection of the second intersection line 19 on the light-exit surface 7. The orthogonal projection of the first end surface 14 on the light-exit surface 7 and the orthogonal projection of the second end surface 15 on the light-exit surface 7 are both isosceles triangles. The orthogonal projection of the third inclined surface and the fourth inclined surface on the light-exit surface 7 is a rectangle.

[0088] FIG. 9 is a first included angle and luminance relationship curve diagram of the present example embodiments, and FIG. 10 is a second included angle and luminance relationship curve diagram of the present example embodiments. In some example embodiments, as shown in FIGS. 2-10, the angle between the plane of the third inclined surface 9 and the reflective surface 6 can be a first included angle (A1), and the angle between the plane of the fourth inclined surface 10 and the reflective surface 6 can be a second included angle (A2). The angle of the first included angle (A1) is greater than the angle of the second included angle (A2). The angle of the first included angle (A1) can be 40°-60°, and the angle of the second included angle (A2) can be 20°-40°. According to FIG. 9, when the angle of the first included angle (A1) is 40°, the light guide plate can obtain the best luminance. According to FIG. 10, when the angle of the second included angle (A2) is 20°, the light guide plate can obtain the best luminance.

[0089] In some example embodiments, as shown in FIGS. 2-8, the first cross section can be trapezoidal, the first cross section includes a first edge 27 and a second edge 28 located at two ends of the third direction respectively, the first edge 27 can form a third angle (B1) with the plane where the reflective surface 6 is located, and the second edge 28 can form a fourth angle (B2) with the plane where the reflective surface 6 is located. In this example, the trapezoidal shape of the first cross section can be isosceles trapezoidal, the third angle (B1) and the fourth angle (B2) can have the same angle value, and the angle value of the third angle (B1) and the fourth angle (B2) can be 40°-60°. However, it is not limited to this, for example, the angle value of the third angle (B1) and the fourth angle (B2) can not be equal.

[0090] In some example embodiments, as shown in FIGS. 2-8, the orthographic projection of the dot 4 on the light exit surface 7 can be hexagonal, the maximum size of the dot 4 in the first direction (Z direction) can be H, the maximum size of the dot 4 in the second direction (X direction) can be W, and the maximum size of the dot 4 in the third direction can be L. Wherein, the value of L can be 145-165 microns; the value of W can be 65-85 microns; the value of H can be 10-20 microns, so that L:W:H can be (145-165):(65-85):(10-20). However, it is not limited to this, for example, using injection molding process, the value of L can be less than 145 microns, the value of W can be less than 65 microns, and the value of H can be less than 10 microns. The size of H, W and L represents the size of the volume occupied by the dot 4, that is, the size of the dot 4. FIG. 11 is a curve of the relationship between the size of the dot and the brightness of the example embodiment, as shown in FIG. 11, the smaller the dot 4, the better the brightness of the light guide plate output.

[0091] FIG. 12 is a first schematic diagram of the light propagation of the light guide plate of the example embodiment, and FIG. 13 is a second schematic diagram of the light propagation of the light guide plate of the example embodiment. In some example embodiments, as shown in FIG. 12, the LED lamp 1 can be a surface light source, and the light distribution of the LED lamp 1 is hemispherical. After the light enters the light guide plate, most of the light is perpendicular to the light bar distribution. The light emitted by the LED lamp 1 is shown by the dotted arrow, which enters the light guide plate 2 from the light entrance surface 5, and is reflected to the light exit surface 7 by the third inclined surface 9. At the same time, there are light beams that are at a certain angle with the light bar or even parallel to the third direction (Y direction) in the light entering the light guide plate 2. If the first side surface 14 and the second side surface 15 are both parallel to the first plane, the light will be reflected on the surface and cannot be emitted. As shown in FIG. 13, the light shown by the dotted arrow is parallel to the third direction (Y direction), and the inclined surface 11 of this example can reflect the light parallel to the third direction (Y direction) to the light exit surface 7 and vertically exit the light guide plate 2 at a small angle. Thus, more light exits the light guide plate at a small angle, thereby increasing the light conversion efficiency.

[0092] In some example embodiments, as shown in FIGS. 2-8, the dot density is the number of dots 4 per unit area of the reflective surface 6. In this example, the dot density on the side of the reflective surface 6 closer to the light-incident surface 5 can be less than the dot density on the side of the reflective surface 6 farther from the light-incident surface 5, and the dot density gradually increases in the second direction (X direction) away from the light-incident surface 5.

[0093] FIG. 14 is a comparison diagram of luminance test data of this example embodiment. In some example embodiments, as shown in FIGS. 2-8, the first angle (A1) in this example can be 40°, the second angle (A1) can be 20°, the third angle (B1) and the fourth angle (B2) can both be 40°. In addition, H:W:L can be 150:75:18, i.e., L=150um, D=75um, and H=18um. As shown in FIG. 14, there are three sets of experimental data. The first set of experimental data is for a backlight module using spherical dots. The second set of experimental data is for a backlight module using the dots of this example simulated by simulation software. The third set of experimental data is for a backlight module having the dots of this example. As can be seen, the simulated backlight module has a luminance increase of 6.4% and a uniformity of 86.1%, which meets the requirements. Further, according to this design parameter, the backlight module is manufactured and the dots are processed, and the actual measured luminance of the backlight module increases by 5.0%-8.4%, and the actual measured uniformity is 81.6%-85.5%, which meets the requirements.

[0094] FIG. 15 is another schematic diagram of a backlight module of this example embodiment, and FIG. 16 is a partial cross-sectional view of the light guide plate in FIG. 15. In some example embodiments, as shown in FIGS. 15 and 16, the dot 4 can be a protruding structure protruding away from the light-incident surface 7, i.e., the dot 4 forms a first protrusion 29 of the reflective surface 6. The surface of the first protrusion 29 away from the reflective surface 6 includes a third end surface 9, a fourth end surface 10, a first end surface 14, and a second end surface 15. The first end surface 14 and the second end surface 15 both include two inclined surfaces 11, i.e., the first end surface 14 and the second end surface 15 both include a first inclined surface 12 and a second inclined surface 13. The light emitted by the LED lamp 1 enters the light guide plate 2 through the light-incident surface 5, and the light is reflected by the third inclined surface 9 toward the light-incident surface 7. At the same time, there are light rays in the light beam entering the light guide plate 2 that are at an angle with the lamp strip or even parallel to the third direction (Y direction). The inclined surface 11 of this example can reflect the light rays parallel to the third direction (Y direction) toward the light-incident surface 7 and perpendicularly out of the light guide plate 2 at a small angle. Thus, more light rays perpendicularly out of the light guide plate at a small angle, thereby increasing the light conversion efficiency. The dot 4 protrudes relative to the substrate 3, and this dot 4 can be formed on the reflective surface 6 of the substrate 3 by injection molding or the like.

[0095] Fig. 17 is a schematic view of another light guide plate according to the present exemplary embodiment, Fig. 18 is a schematic view of a cross section along the line D-D in Fig. 17, and Fig. 19 is a schematic view of a cross section along the line E-E in Fig. 17. In some exemplary embodiments, as shown in Figs. 17 to 19, the dots 4 can be in the form of protrusions or in the form of grooves. In the present example, the dots 4 are in the form of grooves, and the orthographic projection of the dots 4 on the light exit face 7 can be in the form of rice grains. The surface of the dot 4 includes a third end face 9, a fourth end face 10, a first end face 14, and a second end face 15. The first end face 14 and the second end face 15 each include two inclined faces 11, i.e., the first end face 14 and the second end face 15 each include a first inclined face 12 and a second inclined face 13.

[0096] In some exemplary embodiments, as shown in Figs. 17 to 19, the third inclined face 9 is located on the side of the dot 4 in the second direction (X direction) close to the light entrance face 5, and the fourth inclined face 10 is located on the side of the dot 4 in the second direction (X direction) away from the light entrance face 5. The plane on which the third inclined face 9 is located and the plane on which the fourth inclined face 10 is located are each arranged to intersect the light entrance face 5, i.e., neither the third inclined face 9 nor the fourth inclined face 10 is parallel to the light entrance face 5. The third inclined face 9 and the fourth inclined face 10 each intersect the reflective face 6 at one end in the first direction (Z direction), and the third inclined face 9 intersects the fourth inclined face 10 at the other end in the first direction (Z direction). The intersection of the third inclined face 9 and the fourth inclined face 10 forms a second intersection line 19, which can be parallel to the light entrance face 5 and the light exit face 7. The third inclined face 9 and the fourth inclined face 10 form a "chevron" shape, such that the distance between the third inclined face 9 and the fourth inclined face 10 linearly decreases in the direction away from the reflective face 6 in the first direction (Z direction). The distance between the third inclined face 9 and the fourth inclined face 10 can be the spacing of the third inclined face 9 and the fourth inclined face 10 in the second direction (X direction). The angle between the plane on which the third inclined face 9 is located and the reflective face 6 can be a first angle (A1), and the angle between the plane on which the fourth inclined face 10 is located and the reflective face 6 can be a second angle (A2). The angle of the first angle (A1) can be greater than the angle of the second angle (A2). The angle of the first angle (A1) can be 40° to 60°, and the angle of the second angle (A2) can be 20° to 40°.

[0097] In some exemplary embodiments, as shown in Figs. 17 to 19, the first inclined face 12 can be located on the side of the second inclined face 13 close to the light entrance face 5, and the second inclined face 13 can be located on the side of the first inclined face 12 close to the light exit face 8. The connection position of the first inclined face 12 and the second inclined face 13 forms a first intersection line 20, which is connected to the second intersection line 19 and is parallel to the light entrance face 5. The first intersection line 20 and the second intersection line 19 form an arc shape, and the orthographic projection of the first intersection line 20 on the light exit face 7 is collinear with the orthographic projection of the second intersection line 19 on the light exit face 7.

[0098] In some example embodiments, as shown in FIGS. 17-19, the maximum size of the dot 4 in the first direction (Z direction) is H, the maximum size of the dot 4 in the second direction (X direction) is W, and the maximum size of the dot 4 in the third direction is L. In some example embodiments, L can be 250-270 microns, H can be 10-20 microns, and W can be 80-100 microns. Thus, the ratio of the three can be L:W:H = (250-270):(80-100):(10-20). However, the values are not limited to this range. For example, using injection molding or other processes, L can be less than 250 microns, W can be less than 80 microns, and H can be less than 10 microns. In this example, the ratio of the three can be L:W:H = 260:90:15, i.e., L can be 260 microns, H can be 15 microns, and W can be 90 microns.

[0099] FIG. 20 is a test data graph of the light guide plate in FIG. 17. In some example embodiments, the light guide plate in this example has a measured brightness increase of 2.8-5.7%, a measured uniformity of 80.9-88.9%, which meets the requirements, and an improvement of 0.01 in TCO viewing angle uniformity compared to a related mass production design. TCO is a set of comprehensive certification standards for electronic devices. TCO standards were originally proposed by the Swedish Professional Employees Association. TCO standards cover many aspects, including ecology, energy, radiation, and ergonomics.

[0100] Figure 21 is a schematic view of another light guide plate according to the present exemplary embodiment, and Figure 22 is a partial schematic view of the light guide plate of Figure 21. In some exemplary embodiments, as shown in Figures 21 and 22, the light guide plate 2 further includes transparent particles 30 disposed in the substrate 3, and the transparent particles 30 have a refractive index different from that of the substrate 3. The transparent particles 30 can break total reflection, substantially increase light conversion efficiency and total luminous flux, and make the exit angle more divergent and uniform, thereby improving brightness, surface uniformity and viewing angle. The transparent particles 30 can be particles having a diameter of 1 to 10 μιη. In the present example, the transparent particles 30 have a diameter a, and a can be 4 μιη. The transparent particles 30 can be doped in the substrate 3, and the transparent particles 30 have a refractive index slightly greater than that of the substrate 3. In the present example, the transparent particles 30 have a refractive index N1, and the substrate 3 has a refractive index N2, where N1=N2+0.01. For example, the substrate 3 can be a copolymer (i.e., MS) synthesized using polymethyl methacrylate (PMMA) and styrene (PS) as main raw materials, the substrate 3 has a refractive index of 1.53, and the transparent particles 30 can be made of PE, PVC or MABS (Modified Acrylonitrile Butadiene Styrene), and the transparent particles 30 have a refractive index of 1.54, but are not limited thereto. For another example, the substrate 3 can be polymethyl methacrylate (PMMA).

[0101] In some exemplary embodiments, as shown in Figures 21 and 22, the substrate 3 has a dimension b in the first direction (Z direction), and the substrate 3 can be divided into a particle region K1 and a first region K2 in the first direction (Z direction), where the particle region K1 is located on the side of the first region K2 close to the reflecting surface 6, and the substrate 3 is doped with the transparent particles 30 in the particle region K1, but is not doped with the transparent particles 30 in the first region K2. The particle region K1 has a dimension of about 1 / 10 to 1 / 100 of the value of b in the first direction (Z direction).

[0102] Figure 23 is a diagram of simulation comparison experimental data of the light guide plate of the present example embodiment. In some example embodiments, as shown in Figure 23, there are two kinds of light guide plates, namely the light guide plate of scheme one and the light guide plate of scheme two. The difference between the light guide plates of scheme one and scheme two is that the light guide plate of scheme two is doped with transparent particles 30, while the light guide plate of scheme one is not doped with transparent particles 30. Simulation experiments are conducted on the light guide plates of scheme one and scheme two, and the data comparison results of Figure 23 are obtained from the simulation experiment results. The brightness of the light guide plate doped with transparent particles 30 is relatively improved by 2.3%, and the uniformity of 88.1% meets the uniformity standard requirements. In addition, the applicant has actually processed the light guide plates of the two schemes, and conducted optical tests on the physical objects. The results show that the brightness of the light guide plate of scheme two is improved by 2.3%-3.2% compared with the light guide plate of scheme one, and the uniformity is 86%-90%, which meets the uniformity requirements.

[0103] In some example embodiments, as shown in Figures 21 and 22, the substrate 3 has any one of the above-mentioned embodiments of the dot 4 on the reflecting surface 6. The dot 4 can break the total reflection to allow the light to exit, but the processing technology limits the size of the dot, and the light at the position without the dot 4 is totally reflected and not utilized. The light exit rate and conversion efficiency are low. The above-mentioned transparent particles 30 can break the total reflection occurring at the position without the dot 4, sufficiently improve the light conversion rate and total exit light flux, and make the exit angle more divergent and more uniform. This improves the brightness and is beneficial to improve the surface uniformity and viewing angle. In addition, in some example embodiments, as shown in Figures 21 and 22, the substrate 3 is provided with a prism microstructure 31 at the light exit surface 7.

[0104] Figure 24 is a schematic diagram of optical test points of the light guide plate in Figure 21. In some example embodiments, the light guide plate 2 can be divided into nine areas (i.e. ① to ⑨) in optical testing. The light guide plate in Figure 21 has transparent particles 30 and dots 4 as shown in Figures 2 to 8. The applicant has another related light guide plate for optical testing and comparison of test data. The optical testing is carried out according to the test point positions in Figure 24. The light guide plate of the present example can improve the brightness by about 7.3%-10.7% relative to the related other light guide plate, and meets the 9-point uniformity ≥80% and the TCO viewing angle uniformity. In addition, the light guide plate shown in Figure 21 has been tested for quality reliability. The light guide plate of the present example has mass production and product universality.

[0105] In some example embodiments, a backlight module comprises the above-mentioned light guide plate 2.

[0106] In some example embodiments, a display device can include the backlight module described above, and the display device can be an LCD display device. The display device provided by the embodiments of the present disclosure can be applied to electronic equipment, and can be a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, a vehicle-mounted display, and can also be a wearable device or any product or component having a display function, such as a smart watch, a smart bracelet, smart glasses, smart earphones, smart clothing, a head-mounted display, and the like.

[0107] In combination with the above embodiments, the light guide plate achieves a brightness increase of 7.3%-10.7%, and can also meet the 9-point brightness uniformity. Compared with the existing product, the light guide plate of the example increases the brightness without affecting the product viewing angle, and meets the TCO viewing angle requirement. Moreover, the light guide plate of the example passes the quality reliability test, has mass production and product universality, and can be used for subsequent ES9.0 or HDR600 future high-end product upgrades. In addition, compared with the existing product, the light guide plate of the example has high collimation of output light, and can appropriately reduce the application of film materials, thereby reducing the cost.

[0108] Although the embodiments disclosed in the present disclosure are as described above, the content described is only the embodiments adopted for the purpose of facilitating the understanding of the present disclosure, and is not intended to limit the present disclosure. Any person skilled in the art of the present disclosure can make any modification and change in the form and details without departing from the spirit and scope of the present disclosure, but the patent protection scope of the present disclosure shall be subject to the scope defined by the appended claims.

Claims

1. A light guide plate, wherein, The application relates to a substrate, which comprises: a substrate having an incident surface and a reflecting surface, the reflecting surface being located at one end of the substrate in a first direction, the incident surface being located at one end of the substrate in a second direction, the first direction being perpendicular to the substrate, and the second direction being perpendicular to the first direction; a dot being arranged on the reflecting surface, the dot being arranged as a first cross section parallel to the incident surface, the first cross section being arranged as linearly decreasing in a direction away from the reflecting surface in a third direction, the third direction being parallel to the incident surface and perpendicular to the first direction; the dot comprising a first end surface and a second end surface, the first end surface and the second end surface being respectively located at two ends of the dot in the third direction, the first end surface and the second end surface both comprising at least one inclined surface, the inclined surface being arranged as intersecting with a first plane and the reflecting surface respectively, and the first plane being arranged as being perpendicular to the reflecting surface and the incident surface; the dot further comprising a third inclined surface and a fourth inclined surface, the third inclined surface being located on a side of the dot close to the incident surface in the second direction, and the fourth inclined surface being located on a side of the dot away from the incident surface in the second direction, the third inclined surface being arranged as intersecting with the incident surface, and the fourth inclined surface being arranged as intersecting with the incident surface; and the distance between the third inclined surface and the fourth inclined surface being arranged as linearly decreasing in a direction away from the reflecting surface. The application further relates to a substrate, which comprises: a substrate having an incident surface and a reflecting surface, the reflecting surface being located at one end of the substrate in a first direction, the incident surface being located at one end of the substrate in a second direction, the first direction being perpendicular to the substrate, and the second direction being perpendicular to the first direction; a dot being arranged on the reflecting surface, the dot being arranged as a first cross section parallel to the incident surface, the first cross section being arranged as linearly decreasing in a direction away from the reflecting surface in a third direction, the third direction being parallel to the incident surface and perpendicular to the first direction; the dot comprising a first end surface and a second end surface, the first end surface and the second end surface being respectively located at two ends of the dot in the third direction, the first end surface and the second end surface both comprising at least one inclined surface, the inclined surface being arranged as intersecting with a first plane and the reflecting surface respectively, and the first plane being arranged as being perpendicular to the reflecting surface and the incident surface; the dot further comprising a third inclined surface and a fourth inclined surface, the third inclined surface being located on a side of the dot close to the incident surface in the second direction, and the fourth inclined surface being located on a side of the dot away from the incident surface in the second direction, the third inclined surface being arranged as intersecting with the incident surface, and the fourth inclined surface being arranged as intersecting with the incident surface; and the distance between the third inclined surface and the fourth inclined surface being arranged as linearly decreasing in a direction away from the reflecting surface. The application further relates to a substrate, which comprises: a substrate having an incident surface and a reflecting surface, the reflecting surface being located at one end of the substrate in a first direction, the incident surface being located at one end of the substrate in a second direction, the first direction being perpendicular to the substrate, and the second direction being perpendicular to the first direction; a dot being arranged on the reflecting surface, the dot being arranged as a first cross section parallel to the incident surface, the first cross section being arranged as linearly decreasing in a direction away from the reflecting surface in a third direction, the third direction being parallel to the incident surface and perpendicular to the first direction; the dot comprising a first end surface and a second end surface, the first end surface and the second end surface being respectively located at two ends of the dot in the third direction, the first end surface and the second end surface both comprising at least one inclined surface, the inclined surface being arranged as intersecting with a first plane and the reflecting surface respectively, and the first plane being arranged as being perpendicular to the reflecting surface and the incident surface; the dot further comprising a third inclined surface and a fourth inclined surface, the third inclined surface being located on a side of the dot close to the incident surface in the second direction, and the fourth inclined surface being located on a side of the dot away from the incident surface in the second direction, the third inclined surface being arranged as intersecting with the incident surface, and the fourth inclined surface being arranged as intersecting with the incident surface; and the distance between the third inclined surface and the fourth inclined surface being arranged as linearly decreasing in a direction away from the reflecting surface. ​ 2. The light guide plate according to claim 1, wherein ​ ​ 3. The light guide plate according to claim 2, wherein ​ ​ ​ 4. The light guide plate according to claim 3, wherein ​ ​ ​ 5. The light guide plate of claim 2, wherein, ​ 6. The light guide plate according to claim 5, wherein ​ 7. The light guide plate according to claim 5, wherein ​ 8. The light guide plate according to claim 3, wherein ​ The second edge forms a fourth angle with the plane of the reflecting surface, and the fourth angle is set to be 40° to 60°.

9. The light guide plate according to claim 8, wherein The third angle and the fourth angle are equal in value and are both 40°.

10. The light guide plate according to claim 3, wherein The orthogonal projection of the dot on the light-exiting surface is set to be a hexagon, the maximum size of the dot in the first direction is H, the maximum size of the dot in the second direction is W, and the maximum size of the dot in the third direction is set to be L, the light-exiting surface is located on the side of the substrate away from the reflecting surface, and L:W:H=(145-165):(65-85):(10-20).

11. The light guide plate according to claim 10, wherein L:W:H=155:75:

15.

12. The light guide plate of claim 3, wherein, The orthogonal projection of the dot on the light-exiting surface is set to be a hexagon, the maximum size of the dot in the first direction is H, the maximum size of the dot in the second direction is W, and the maximum size of the dot in the third direction is set to be L, the light-exiting surface is located on the side of the substrate away from the reflecting surface, and L:W:H=(145-165):(65-85):(10-20).

13. The light guide plate of claim 12, wherein, L:W:H=260:90:

15.

14. The light guide plate according to any one of claims 1 to 13, wherein The density of the dots on the reflecting surface is set to gradually increase along the direction away from the light-entering surface.

15. The light guide plate according to any one of claims 1 to 13, wherein The dots are set to be a groove structure formed by recessing the reflecting surface, or a protruding structure protruding from the reflecting surface.

16. The light guide plate according to any one of claims 1 to 13, further comprising transparent particles, the transparent particles being disposed in the substrate, and the transparent particles having a refractive index greater than a refractive index of the substrate.

17. The light guide plate of claim 16, wherein, The refractive index of the transparent particles is set to be N1, and the refractive index of the substrate is set to be N2, and N1=N2+0.

01.

18. The light guide plate of claim 16, wherein, The diameter of the transparent particles is set to be 1 um to 10 um.

19. The light guide plate of claim 18, wherein, The diameter of the transparent particles is set to be 4 um.

20. The light guide plate of claim 16, wherein, The substrate includes a particle region and a first region in the first direction, the particle region is disposed on the side of the first region close to the reflecting surface, and the transparent particles are disposed in the particle region.

21. The light guide plate of claim 20, wherein, The ratio of the size of the particle region in the first direction to the size of the substrate in the first direction is set to be 0.01 to 0.

1.

22. A backlight module, comprising: A backlight module comprising the light guide plate according to any one of claims 1 to 21.

23. A display device comprising: A backlight module comprising the light guide plate according to claim 22.

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