Light guide structure, light guide assembly, and backlight module

Abstract

A light guide structure (100), a light guide assembly (1), and a backlight module. The light guide structure (100) comprises a light guide plate (101); the light guide plate (101) is a regular polygonal plate; a light incident hole (1a) is formed in the geometric center of the light guide plate (101); the hole wall of the light incident hole (1a) comprises a plurality of edge side light incident surfaces (1a1) and a plurality of corner side light incident surfaces (1a2); the plurality of edge side light incident surfaces (1a1) face the sides of the light guide plate (101) in a one-to-one correspondence mode; the plurality of corner side light incident surfaces (1a2) face the corners of the light guide plate (101) in a one-to-one correspondence mode; the distance between each corner side light incident surface (1a2) and the center of the light incident hole (1a) is smaller than the distance between each edge side light incident surface (1a1) and the center of the light incident hole (1a).

Description

Light guide structure, light guide component and backlight module

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on August 3, 2023, with application number 202310978244.6 and invention name “Light guide structure, light guide assembly and backlight module”, all contents of which are incorporated by reference in this disclosure. Technical Field

[0002] The present disclosure relates to the field of display technology, and in particular to a light guide structure, a light guide component, and a backlight module. Background Art

[0003] In the related art, the brightness uniformity of the direct-lit display module is relatively low, which has a significant impact on the display visual effect of the direct-lit display module. Technical issues

[0004] Improving brightness uniformity is an important issue in improving the visual quality of direct-lit display modules. Technical Solutions

[0005] The embodiments of the present disclosure provide a light guide structure, a light guide assembly, and a backlight module, which can improve brightness uniformity and thus improve display visual effects.

[0006] In a first aspect, an embodiment of the present disclosure provides a light guide structure, comprising a light guide plate, which is a regular polygonal plate; a light entrance hole is provided at the geometric center of the light guide plate, and the hole wall of the light entrance hole comprises a plurality of side light entrance surfaces and a plurality of corner light entrance surfaces, the plurality of side light entrance surfaces are respectively oriented toward the edges of the light guide plate, the plurality of corner light entrance surfaces are respectively oriented toward the corners of the light guide plate, and the distance between the corner light entrance surfaces and the center of the light entrance hole is smaller than the distance between the side light entrance surfaces and the center of the light entrance hole.

[0007] In some embodiments, the light guide plate includes a light guide plate body and a reflective element, one side of the light guide plate body is a light emitting surface, and the other side is a back surface, the light entrance hole is arranged on the light guide plate body, the reflective element is arranged at the light entrance hole, and the reflective element is provided with a reflective surface facing the light entrance hole.

[0008] In some embodiments, the reflective element is fixed to the light emitting surface, and a surface of the reflective element away from the reflective surface is flush with the light emitting surface.

[0009] In some embodiments, the reflective surface is a hemispherical surface.

[0010] In some embodiments, one side of the light guide plate is a light emitting surface, and the other side is a back surface, and a plurality of light guide dots are provided on the back surface.

[0011] In some embodiments, one side of the light guide plate is a light emitting surface, and the other side is a back surface. A plurality of annular grooves are provided on the back surface, and the annular grooves are arranged around the light incident hole.

[0012] In some embodiments, the annular groove portion takes the light entrance hole as a geometric center, and the annular groove portion and the light guide plate have similar shapes.

[0013] In some embodiments, when a plurality of annular grooves are provided on the back surface, the plurality of annular grooves are spaced apart in sequence, and the depths of the plurality of annular grooves increase from the inside to the outside.

[0014] In some embodiments, the light guide structure further includes a first reflective sheet, one side of the light guide plate is a light emitting surface, and the other side is a back surface, the first reflective sheet is attached to cover the back surface of the light guide plate, and the reflective surface of the first reflective sheet faces the inside of the light guide plate.

[0015] In some embodiments, the light guide structure also includes a second reflective sheet, and the edge of the light guide plate also has a peripheral side surface connecting the light emitting surface and the back surface, the second reflective sheet is attached to cover the peripheral side surface of the light guide plate, and the reflective surface of the second reflective sheet faces the inside of the light guide plate.

[0016] In some embodiments, the side light incident surface is a curved surface, and the corner light incident surface is a flat surface.

[0017] In some embodiments, the light guide plate is a square plate, and the light incident hole is a rounded diamond-shaped hole.

[0018] In the second aspect, an embodiment of the present disclosure provides a light-guiding component, comprising a light-emitting element and a light-guiding structure provided by any of the above embodiments, wherein the light-emitting element is embedded in the light-entry hole; when the light-guiding component comprises a plurality of the light-guiding structures, the plurality of light-guiding structures are arrayed and spliced ​​in sequence.

[0019] In a third aspect, an embodiment of the present disclosure provides a backlight module, comprising the light guide assembly provided in the above embodiment. Beneficial effects

[0020] The disclosed embodiment sets a light entrance hole at the geometric center of the light guide plate, and the hole wall of the light entrance hole includes multiple side light entrance surfaces and multiple corner side light entrance surfaces, and the distance between the corner side light entrance surface and the center of the light entrance hole is smaller than the distance between the side light entrance surface and the center of the light entrance hole, so that the spacing between the corner side light entrance surface and the light-emitting element is smaller than the spacing between the side light entrance surface and the light-emitting element, so that more light energy is irradiated from the light-emitting element to the corner side light entrance surface; in this way, the brightness of each area on the light guide plate, including each side and each corner, is relatively close, which can improve the brightness uniformity of the direct-type display, thereby improving the display visual effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] FIG1 is an axonometric structural diagram of a light guide structure provided by some embodiments of the present application at a first viewing angle;

[0023] FIG2 is an axonometric structural diagram of a light guide structure provided by some embodiments of the present application at a second viewing angle;

[0024] FIG3 is an exploded structural diagram of a light guide structure provided by some embodiments of the present application at a second viewing angle;

[0025] FIG4 is a cross-sectional structural diagram of a light guide structure provided in some embodiments of the present application;

[0026] FIG5 is a cross-sectional structural diagram of a light guide assembly provided in some embodiments of the present application;

[0027] FIG6 is a diagram showing the splicing structure of the light guide assembly provided by some embodiments of the present application at a first viewing angle;

[0028] FIG7 is a diagram showing a visual effect simulation of a light guide assembly in a spliced ​​structure according to some embodiments of the present application;

[0029] FIG8 is a diagram showing a visual simulation effect of a light guide assembly in a splicing structure in the related art.

[0030] Description of main component symbols:

[0031] 1-light guide assembly, 100-light guide structure, 101-light guide plate, 10-light guide plate body, 11-light output surface, 111-installation groove portion, 12-back surface, 121-annular groove portion, 13-surface surface, 1a-light entrance hole, 1a1-side light entrance surface, 1a2-corner light entrance surface, 1b-corner, 20-reflector, 21-first reflective surface, 102-first reflective sheet, 103-second reflective sheet, 200-light-emitting element. Modes for Carrying Out the Invention

[0032] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0033] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present disclosure. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present disclosure, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0034] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0035] The use of "suitable for" or "configured to" in this disclosure is intended to be open and inclusive language, and does not exclude devices that are adapted or configured to perform additional tasks or steps. In addition, the use of "based on" is intended to be open and inclusive, as a process, step, calculation, or other action that is "based on" one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0036] In this disclosure, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this disclosure as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to implement and use the present disclosure. In the following description, details are listed for the purpose of explanation. It should be understood that one of ordinary skill in the art will recognize that the present disclosure can be implemented without these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present disclosure with unnecessary details. Therefore, the present disclosure is not intended to be limited to the embodiments shown, but is to be consistent with the widest scope consistent with the principles and features disclosed herein.

[0037] As shown in FIG. 1 to FIG. 5 , in a first aspect, an embodiment of the present disclosure provides a light guide structure 100 , which includes a light guide plate 101 , and can improve brightness uniformity, thereby improving display visual effects.

[0038] The light guide plate 101 is a regular polygonal plate, which can be a regular shape such as a triangle, a quadrilateral, or a hexagon, but the present disclosure does not limit this. In some examples, the light guide plate 101 can be a regular polygon, such as an equilateral triangle, a square, or a regular hexagon. Here, the regular polygonal plate has a geometric center.

[0039] A light entrance hole 1a is provided at the geometric center of the light guide plate 101. The light entrance hole 1a is used to accommodate the light emitting element 200. Light emitted by the light emitting element 200 is incident into the light guide plate 101 through the light entrance hole 1a. Here, the hole wall of the light entrance hole 1a includes multiple side light entrance surfaces 1a1 and multiple corner light entrance surfaces 1a2.

[0040] The plurality of side light incident surfaces 1a1 are equal in number to the edges of the light guide plate 101. These side light incident surfaces 1a1 correspond one-to-one to the edges of the light guide plate 101, such that each edge of the light guide plate 101 is provided with a corresponding side light incident surface 1a1. The plurality of corner light incident surfaces 1a2 are equal in number to the corners of the light guide plate 101, such that each corner 1b of the light guide plate 101 is provided with a corresponding corner light incident surface 1a2. The distance between the corner light incident surface 1a2 and the center of the light entrance hole 1a is less than the distance between the side light incident surface 1a1 and the center of the light entrance hole 1a, such that the spacing between the corner light incident surface 1a2 and the light-emitting element 200 is less than the spacing between the side light incident surface 1a1 and the light-emitting element 200.

[0041] When the light-emitting element 200 embedded in the light entrance hole 1a emits light, the light emitted by the light-emitting element 200 can directly illuminate the side light entrance surfaces 1a1 and the corner light entrance surfaces 1a2. The side light entrance surfaces 1a1 guide the incident light incident thereon to the corresponding sides of the light guide plate 101, and light up the sides of the light guide plate 101, while the corner light entrance surfaces 1a2 guide the incident light incident thereon to the corresponding corners 1b of the light guide plate 101, and light up the corners of the light guide plate 101.

[0042] Since the distance between the corner light incident surface 1a2 and the center of the light incident hole 1a is smaller than the distance between the side light incident surface 1a1 and the center of the light incident hole 1a, the spacing between the corner light incident surface 1a2 and the light-emitting element 200 is smaller than the spacing between the side light incident surface 1a1 and the light-emitting element 200. Therefore, the light energy irradiated from the light-emitting element 200 to the corner light incident surface 1a2 is relatively large, and this part of the incident light can still achieve the required brightness when it propagates to the corner 1b farther away from the light incident hole 1a; while the light energy irradiated from the light-emitting element 200 to the side light incident surface 1a1 is relatively small, and this part of the incident light will not be too bright when it propagates to the edges closer to the light incident hole 1a. In this way, the brightness of each area on the light guide plate 101, including the edges and corners, is relatively close, which can improve the brightness uniformity of the direct-type display, thereby improving the display visual effect.

[0043] The structure of the light guide plate 101 can be determined according to actual needs, and can adopt types such as an integral injection molding structure, a split splicing structure, etc., which are not limited in the embodiments of the present disclosure. In some embodiments, the light guide plate 101 may include a light guide plate body 10 and a reflector 20. One side of the light guide plate body 10 along its thickness direction is a light emitting surface 11, and the other side is a back surface 12. The light entrance hole 1a can be provided on the light guide plate body 10, for example, it can be provided on the back surface 12. The reflector 20 is provided at the light entrance hole 1a, and the reflector 20 is provided with a reflective surface facing the light entrance hole 1a, that is, a first reflective surface 21.

[0044] When the light-emitting element 200 embedded in the light entrance hole 1a emits light, the light emitted by the light-emitting element 200 may be irradiated onto the first reflecting surface 21 of the reflecting member 20; at this time, the first reflecting surface 21 can reflect the light irradiated thereon and evenly reflect this part of the light onto each side light entrance surface 1a1 and the corner side light entrance surface 1a2, thereby increasing the light energy entering the light guide plate 101 from each side light entrance surface 1a1 and the corner side light entrance surface 1a2, thereby improving the utilization rate of the light emitted by the light-emitting element 200 and the display brightness of the light guide structure 100.

[0045] In some examples, the reflector 20 can be fixed to the light emitting surface 11, and the side of the reflector 20 away from the first reflective surface 21 is flush with the light emitting surface 11. In this way, the first reflective surface 21 can be located within the light incident hole 1a, and the light emitting surface 11 of the light guide plate 101 is a flat surface, which is convenient for installation and coordination with other structures in the backlight module, such as optical films.

[0046] For example, the light emitting surface 11 may be provided with a mounting groove 111, which may be arranged corresponding to and connected to the light incident hole 1a. Here, the reflector 20 may be embedded and fixed in the mounting groove 111, so that the first reflective surface 21 is located within the light incident hole 1a, and the side surface of the reflector 20 away from the first reflective surface 21 is flush with the light emitting surface 11.

[0047] The shape of the first reflective surface 21 can be determined based on actual needs and can be, for example, a flat surface or a curved surface, and is not limited in this embodiment. In some examples, the first reflective surface 21 can be a hemispherical surface; a hemispherical surface can reflect light incident thereon more evenly, so that the reflected light is more evenly directed to each of the side light incident surfaces 1a1 and the corner light incident surfaces 1a2.

[0048] Exemplarily, the central axis of the hemisphere can coincide with the central axis of the light entrance hole 1a, so that the hemisphere is centered at the light entrance hole 1a; since the distance between the corner light entrance surface 1a2 and the center of the light entrance hole 1a is smaller than the distance between the side light entrance surface 1a1 and the center of the light entrance hole 1a, the spacing between the corner light entrance surface 1a2 and the hemisphere is also smaller than the spacing between the side light entrance surface 1a1 and the hemisphere, so that more light energy is reflected from the hemisphere to the corner light entrance surface 1a2, and less light energy is reflected from the hemisphere to the side light entrance surface 1a1, which better balances the incident amount of the corner light entrance surface 1a2 and the side light entrance surface 1a1, thereby ensuring that the corner 1b obtains the required brightness and the brightness of each side is not too high. The brightness of each area on the light guide plate 101, including each side and each corner, is relatively close, which can improve the brightness uniformity of the direct-type display.

[0049] In some examples, the color of the reflector 20 can be white. Based on the white appearance of the reflector 20, the reflector 20 has a strong reflective effect on the light irradiated on its surface, and enables the reflector 20 to better match the light output display color of the light guide structure 100; when light is irradiated on the surface of the reflector 20, the reflector 20 can reflect the light, return the light to the light guide plate body 10, and then re-emit it, so as to increase the utilization rate of this part of the light. In some examples, the reflector 20 can be made directly of a white substrate, so that the white surface of the reflector 20 is directly presented by the white material. In other examples, the reflector 20 can include a main substrate and a white coating covering the surface of the main substrate. The color of the main substrate is not specifically limited here.

[0050] In some embodiments, one side of the light guide plate 101 along its thickness direction may be the light exit surface 11, and the other side may be the back surface 12. When the light guide plate 101 includes the aforementioned light guide plate body 10, the light exit surface 11 of the light guide plate 101 is the light exit surface 11 of the light guide plate body 10, and the back surface 12 of the light guide plate 101 is the back surface 12 of the light guide plate body 10. In some examples, the back surface 12 may be provided with a plurality of light guide points. The light guide points can scatter the light incident thereon at different angles, thereby disrupting total internal reflection within the light guide plate 101 and allowing the light to exit from the light exit surface 11 of the light guide plate 101.

[0051] In other examples, a plurality of annular grooves 121 may be provided on the back surface 12, and the annular grooves 121 may also scatter the light incident thereon at different angles, thereby destroying the total reflection in the light guide plate 101 and allowing the light to be emitted from the light exit surface 11 of the light guide plate 101. The annular grooves 121 may be provided around the light entrance hole 1a. The annular grooves 121 destroy the total reflection of the light in the light guide plate 101, causing the light to be scattered to the light exit surface 11 of the light guide plate 101 in the shape of the annular grooves 121 and emitted, so that the light exit surface 11 of the light guide plate 101 forms a uniform light spot that matches the shape of the light guide plate 101, and different areas of the uniform light spot have consistent or substantially consistent display brightness; in this way, the brightness of each area of ​​the light guide plate 101, including each edge and corner, can be made closer, thereby improving the display visual effect of the direct-lit backlight display.

[0052] In some examples, the annular groove 121 can have the light entrance hole 1a as its geometric center, and the annular groove 121 and the light guide plate 101 have similar shapes. In other words, the annular groove 121 is a regular polygonal annular groove, and the regular polygonal annular groove and the light guide plate 101 have the same shape but different sizes. For example, when the light guide plate 101 is a quadrilateral plate, the annular groove 121 can be a quadrilateral annular groove. For another example, when the light guide plate 101 is a hexagonal plate, the annular groove 121 can be a hexagonal annular groove. Exemplarily, the groove segments of the regular polygonal annular groove can be equal in number to the edges of the regular polygonal plate, and can be arranged in parallel in a one-to-one correspondence. For example, when the light guide plate 101 is a quadrilateral plate, the annular groove 121 can be a quadrilateral annular groove, correspondingly having four groove segments, and the four groove segments can be arranged in parallel in a one-to-one correspondence with the four edges of the quadrilateral plate.

[0053] In some embodiments, when multiple annular grooves 121 are provided on the back surface 12 of the light guide plate 101, the multiple annular grooves 121 may be spaced apart in sequence, and the depths of the multiple annular grooves 121 may increase from the inside out. In other words, among the multiple annular grooves 121, the depths of the annular grooves 121 closer to the light incident hole 1a are smaller, while the depths of the annular grooves 121 farther from the light incident hole 1a are greater.

[0054] When light propagates outward from the central hole, light at different depths can enter the annular grooves 121 with different depths. During this process, each annular groove 121 can scatter the light entering therein in the shape of the annular groove 121, so that the light is scattered to the light-emitting surface 11 of the light guide plate 101, and then emitted from the light-emitting surface 11 of the light guide plate 101 to form an annular light spot corresponding to the shape of the annular groove 121. In this way, multiple annular grooves 121 can be used to form multiple annular light spots on the light-emitting surface 11 of the light guide plate 101, which are arranged in a ring from the geometric center to the outside. Then, the above-mentioned multiple annular light spots together form a planar light spot that matches the shape of the light guide plate 101, which can better homogenize the light spot and expand the homogenized light spot to any desired size, thereby obtaining a surface light source with uniform brightness and a preset area.

[0055] In some embodiments, the light guide structure 100 may further include a first reflective sheet 102. The first reflective sheet 102 is attached to and covers the back surface 12 of the light guide plate 101, with the reflective surface of the first reflective sheet 102 facing into the light guide plate 101. Because the first reflective sheet 102 is attached to and covers the back surface 12 of the light guide plate 101, when light within the light guide plate 101 escapes from the back surface 12, the reflective surface of the first reflective sheet 102 can reflect the escaping light, causing it to re-enter the light guide plate 101. This prevents the light within the light guide plate 101 from escaping from the back surface 12 of the light guide plate 101 and allows it to be emitted only from the light exit surface 11 of the light guide plate 101, thereby improving the light utilization efficiency and display brightness of the light guide structure 100.

[0056] In some examples, the light guide structure 100 may further include a second reflective sheet 103. The edge of the light guide plate 101 may further include a peripheral side surface 13 connecting the light emitting surface 11 and the back surface 12. The second reflective sheet 103 may be attached to and cover the peripheral side surface 13 of the light guide plate 101, with the reflective surface of the second reflective sheet 103 facing into the light guide plate 101. Because the second reflective sheet 103 is attached to and covers the peripheral side surface 13 of the light guide plate 101, when light within the light guide plate 101 escapes from the peripheral side surface 13, the reflective surface of the second reflective sheet 103 may reflect the escaping light and cause it to re-enter the light guide plate 101, so that the light within the light guide plate 101 cannot escape from the peripheral side surface 13 of the light guide plate 101 and can only be emitted from the light emitting surface 11 of the light guide plate 101, thereby improving the light utilization efficiency and display brightness of the light guide structure 100. Exemplarily, the first reflective sheet 102 and the second reflective sheet 103 may be two independent reflective sheets, or may be two regions formed by bending the same reflective sheet.

[0057] The shape of the light entrance hole 1a can be determined according to actual needs, and can be a regular polygonal shape with rounded corners, etc., which is not limited in the embodiments of the present disclosure. In some embodiments, the side light entrance surface 1a1 is a curved surface, and the corner light entrance surface 1a2 is a plane. Since the amount of light energy irradiated from the light-emitting element 200 to the corner light entrance surface 1a2 is relatively large, combined with the planar characteristics of the corner light entrance surface 1a2, this part of the incident light can still achieve the required brightness when it propagates to the corner 1b farther away from the light entrance hole 1a; and since the amount of light energy irradiated from the light-emitting element 200 to the side light entrance surface 1a1 is relatively small, combined with the uniform light effect of the curved surface characteristics of the side light entrance surface 1a1, this part of the incident light will not be too bright when it propagates to the sides closer to the light entrance hole 1a; in this way, the brightness of each area on the light guide plate 101, including each side and each corner, is relatively close, which can improve the brightness uniformity of the direct-type display, thereby improving the display visual effect.

[0058] In some examples, the light guide plate 101 can be a square plate, and the light entrance hole 1a can be a rounded diamond hole, or further a rounded square hole, the side light entrance surface 1a1 is the rounded transition surface of the rounded diamond hole, and the corner light entrance surface 1a2 is a plane located on the wall of the rounded diamond hole.

[0059] As shown in Figures 1 to 6, in the second aspect, the embodiment of the present disclosure provides a light guide component 1, which includes a light-emitting element 200 and a light guide structure 100 provided by any of the above embodiments. Here, the light-emitting element 200 is embedded in the light entrance hole 1a. The type of the light-emitting element 200 can be determined according to actual needs, and can be, for example, Mini LED, Micro LED and other types, which are not limited in the embodiment of the present disclosure. The shape of the light-emitting element 200 can be determined according to actual needs, which is not limited in the embodiment of the present disclosure; in some embodiments, the light-emitting element 200 can have a circular contour, and its orthographic projection on the plane where the light guide plate 101 is located is a circle.

[0060] When the light guide component 1 includes a plurality of light guide structures 100, the plurality of light guide structures 100 are arranged in an array and spliced ​​in sequence. In some embodiments, the back surfaces 12 of the light guide plates 101 of the plurality of light guide structures 100 can be arranged coplanar. Since the light guide component 1 includes a plurality of light guide structures 100 spliced ​​in sequence, each light guide structure 100 forms a homogenized light spot that matches the shape of the light guide plate 101 of the light guide structure 100. The homogenized light spots formed by the plurality of light guide structures 100 can be spliced ​​to obtain the desired overall display light spot. By splicing, it is relatively easy to obtain an overall light spot with a larger size and a more uniform display brightness, which meets the size requirements of a direct-type display under a uniform display effect.

[0061] When multiple light guide structures 100 are arranged in an array and sequentially spliced, each light guide structure 100 may include a first reflective sheet 102, and the first reflective sheet 102 is attached to and covers the back surface 12 and the peripheral side surface 13 of the light guide plate 101. Thus, adjacent light guide structures 100 are blocked by their respective first reflective sheets 102, preventing light from any light guide structure 100 from entering another light guide structure 100 via the peripheral side surface 13 of the light guide plate 101. This prevents optical crosstalk between adjacent light guide structures 100, ensuring that each light guide structure 100 has a relatively uniform display light spot and a better light output display effect.

[0062] As shown in Figures 1 to 6, in a third aspect, an embodiment of the present disclosure provides a backlight module, which includes the light guide assembly 1 provided in the above embodiment. Here, the backlight module can be a direct-lit backlight module.

[0063] In order to intuitively demonstrate the display visual effects, a visual effect simulation comparison of the light guide components in the embodiment of the present disclosure and the related art is provided here. Figure 7 shows the visual effect simulation results of the light guide component 1 of the embodiment of the present disclosure, and the light guide component 1 is spliced ​​together by four light guide structures 100; as shown in Figure 7, different areas on the light guide component 1 provided by the embodiment of the present disclosure have relatively uniform and consistent brightness, and there is no obvious brightness difference. Figure 8 shows the visual effect simulation results of the light guide component in the related art, and the light guide component is spliced ​​together by four square light guide plates and corresponding light-emitting structures, and a cylindrical hole for accommodating a light-emitting element is provided at the geometric center of each square light guide plate; as shown in Figure 8, there is a relatively obvious difference between bright and dark areas on the light guide component in the related art, and there is a significant display visual effect defect. It can be seen that the light guide component 1 and the backlight module provided by the embodiment of the present disclosure can effectively improve the display visual effect.

[0064] The light guide structure, light guide assembly and backlight module provided in the embodiments of the present disclosure are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present disclosure. The description of the above embodiments is only used to help understand the method of the present disclosure and its core idea. At the same time, for those skilled in the art, according to the ideas of the present disclosure, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present disclosure.

Claims

1. A light guide structure, comprising a light guide plate, wherein the light guide plate is a regular polygonal plate; a light entrance hole is provided at the geometric center of the light guide plate, and the hole wall of the light entrance hole comprises a plurality of side light entrance surfaces and a plurality of corner light entrance surfaces, wherein the plurality of side light entrance surfaces are oriented toward the edges of the light guide plate in a one-to-one correspondence, and the plurality of corner light entrance surfaces are oriented toward the corners of the light guide plate in a one-to-one correspondence, and the distance between the corner light entrance surface and the center of the light entrance hole is smaller than the distance between the side light entrance surface and the center of the light entrance hole.

2. According to the light guide structure according to claim 1, the light guide plate includes a light guide plate body and a reflective element, one side of the light guide plate body is a light emitting surface, and the other side is a back side, the light entrance hole is arranged on the light guide plate body, the reflective element is arranged at the light entrance hole, and the reflective element is provided with a reflective surface facing the light entrance hole. 3 . The light-guiding structure according to claim 2 , wherein the reflective element is fixed on the light-emitting surface, and a surface of the reflective element on a side away from the reflective surface is flush with the light-emitting surface. 4 . The light-guiding structure according to claim 3 , wherein a mounting groove portion is provided on the light-emitting surface, the mounting groove portion and the light-entering hole are correspondingly arranged and communicated, and the reflector and the mounting groove portion are embedded and fixed. The light-guiding structure according to claim 2 , wherein the reflective surface is a hemispherical surface. 6 . The light-guiding structure according to claim 5 , wherein the central axis of the hemispherical surface coincides with the central axis of the light-entry hole.

7. According to the light-guiding structure of claim 2, the reflector is made of a white substrate; or, the reflector comprises a main substrate and a white coating covering the surface of the main substrate. 8 . The light guide structure according to claim 1 , wherein one side of the light guide plate is a light emitting side, and the other side is a back side, and a plurality of light guide dots are disposed on the back side. 9 . The light guide structure according to claim 1 , wherein one side of the light guide plate is a light emitting side, and the other side is a back side, and a plurality of annular grooves are provided on the back side, and the annular grooves are arranged around the light incident hole. 10 . The light guide structure according to claim 9 , wherein the annular groove has the light entrance hole as its geometric center, and the annular groove and the light guide plate have similar shapes. 11 . The light guide structure according to claim 10 , when a plurality of the annular grooves are provided on the back surface, the plurality of the annular grooves are arranged in sequence and spaced apart, and the depths of the plurality of the annular grooves increase from the inside to the outside. 12 . The light-guiding structure according to claim 10 , wherein the annular groove is a regular polygonal annular groove, and the number of groove segments of the regular polygonal annular groove and the number of edges of the regular polygonal plate are equal and are arranged in parallel in a one-to-one correspondence.

13. The light guide structure according to claim 1 further comprises a first reflective sheet, one side of the light guide plate is a light emitting surface, and the other side is a back side, the first reflective sheet is attached to cover the back side of the light guide plate, and the reflective surface of the first reflective sheet faces the inside of the light guide plate.

14. According to the light guide structure according to claim 13, the light guide structure also includes a second reflective sheet, the edge of the light guide plate also has a peripheral side surface connecting the light emitting surface and the back surface, the second reflective sheet is attached to and covers the peripheral side surface of the light guide plate, and the reflective surface of the second reflective sheet faces the inside of the light guide plate. 15 . The light guide structure according to claim 14 , wherein the first reflector sheet and the second reflector sheet are two independent reflectors. 16 . The light guide structure according to claim 14 , wherein the first reflective sheet and the second reflective sheet are two regions formed by bending the same reflective sheet. 17 . The light guide structure according to claim 1 , wherein the side light incident surface is a curved surface, and the corner side light incident surface is a flat surface. 18 . The light guide structure according to claim 17 , wherein the light guide plate is a square plate, and the light incident hole is a rounded diamond-shaped hole.

19. A light guide component, comprising a light emitting element and the light guide structure according to any one of claims 1 to 18, wherein the light emitting element is embedded in the light entrance hole; when the light guide component comprises a plurality of the light guide structures, the plurality of light guide structures are arranged in an array and spliced ​​in sequence.

20. A backlight module, comprising the light guide assembly according to claim 19.

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