CN217385880U - Light guide plate, backlight module and display device - Google Patents

Abstract

The utility model discloses a light guide plate and backlight unit thereof, the light guide plate includes: the light guide plate comprises a light guide plate body and a light source, wherein the light guide plate body comprises a light incident surface, a reflecting surface and a light emergent surface, and the light incident surface is arranged on one side of the light guide plate body; the first light guide structures are distributed on the reflecting surface of the light guide plate and comprise convex structures; the second light guide structures are distributed on the reflecting surface of the light guide plate and are concave structures; the light guide plate comprises a light guide plate reflection surface, a first light guide structure and a second light guide structure, wherein the light guide plate reflection surface is provided with a light incident surface, the light incident surface is arranged on the light guide plate reflection surface, the light incident surface is arranged on the light incident surface, the light incident surface is arranged on the light guide plate reflection surface, the light incident surface is arranged on the light incident surface, the light incident surface is arranged on the other side, the light incident surface, the distribution density of the first light guide structure is gradually reduced, and the distribution density of the second light guide structure is gradually increased. The utility model discloses the light guide plate utilizes the first light guide structure of isostructure and second light guide structure's distribution layout, when reinforcing light guide plate luminance, solves the hot spot problem of income light mouth, and this type light guide plate can be used to the backlight unit of narrow frame, promotes backlight unit's luminance, increases effective light-emitting area simultaneously.

Description

Light guide plate, backlight module and display device

[ technical field ] A

The utility model relates to a light guide plate, backlight unit and display device.

[ background of the invention ]

The backlight module is mainly divided into a direct type backlight module and a side edge type backlight module according to the different light source arrangement positions. Taking the side-type backlight module as an example, the side-type backlight module generally includes a light guide plate and a light source disposed at a side of the light guide plate. After light emitted by the light source enters the light guide plate, the light is confined in the light guide plate due to total reflection.

The LCD has a high requirement on the brightness of the backlight, but the high brightness also makes the power consumption of the LCD high, and the backlight is used as the most power consuming part in the LCD module, so it is one of the major trends to improve the brightness of the backlight and then increase the brightness of the LCD without increasing the power consumption. The key to improve the brightness of the backlight source is to improve the light guiding efficiency and brightness of the light guide plate.

The light guide plate functions to guide a scattering direction of light, to improve the brightness of the panel, and to ensure uniformity of the brightness of the panel. The quality of the light guide plate greatly affects the backlight plate, and the design and manufacture of the light guide plate in the side light type backlight module are key technologies. The LED light-bar is positioned at the side edge of the light guide plate, the light emitted by the LED light-bar is guided into the light guide plate by reflection, when the light irradiates the light guide structure, the reflected light can be scattered towards all angles, then the reflection condition is destroyed to be emitted from the front surface of the light guide plate, and the light can be uniformly emitted by the light guide plate by utilizing the light guide structures with various densities and sizes. When designing a light guide structure, a common light guide structure with a crater-like shape is formed by laser etching, or a directional light guide structure with an inclined surface is used, and the emergent light of the common light guide structure is diffused, which is beneficial to solving the problem of picture uniformity of the light guide plate. The back light source has a directional light guide function, can enable light rays to emit in a specific direction, can improve the intensity of positive emergent light of the backlight source by matching with a proper BEF membrane, but is not beneficial to solving the problems of hot spots, dark corners and the like of the LED.

[ Utility model ] content

An object of the utility model is to provide a light guide plate, backlight unit and display device with hi-lite.

The utility model aims at realizing through the following technical scheme:

a light guide plate comprising:

the light guide plate body comprises a light incident surface and a reflecting surface, and the light incident surface is connected with the reflecting surface;

the first light guide structure is formed on the reflecting surface and comprises a convex structure;

the second light guide structure is formed on the reflecting surface and comprises a first concave structure;

the first light guide structures are arranged on the reflecting surface, the second light guide structures are arranged on the reflecting surface, and the light incident surface is arranged on the second light guide structures.

In one embodiment, the first light guiding structure further includes a second recessed structure, the second recessed structure intersects with the reflective surface to form a ring shape, the ring shape includes an inner ring and an outer ring, the outer ring is the second recessed structure, and the inner ring is the protruding structure; the projection of the convex structure on the reflecting surface is positioned in the inner ring.

In one embodiment, the height of the raised structures is 1.5 μm to 4.0 μm.

In one embodiment, the first concave structure is formed by inwards concave from the light guide plate body, the cross section of the first concave structure is one of a rectangle shape, a water drop shape, a C shape, a crescent shape, a disc shape and a bamboo joint shape, and the longitudinal section of the first concave structure is a V shape.

In one embodiment, an angle between an edge of the longitudinal section of the first recess structure and the reflecting surface is in a range of 10 ° to 30 °.

In one embodiment, along a direction away from the light incident surface, the reflective surface sequentially includes: the light guide structure comprises a first area, a second area and a third area, wherein the distribution density of the first light guide structure in the first area, the second area and the third area is reduced in sequence, and the distribution density of the second light guide structure in the first area, the second area and the third area is increased in sequence.

In one embodiment, the distribution density of the first light guide structures in the first region, the second region and/or the third region respectively gradually decreases along a direction away from the light incident surface; the distribution density of the second light guide structures in the first region, the second region and/or the third region is gradually increased along the direction away from the light incident surface.

In one embodiment, the lengths of the first region, the second region and the third region in the direction away from the light incident surface are sequentially increased.

In one embodiment, the lengths of the first region, the second region and the third region along the direction away from the light incident surface are respectively a first length, a second length and a third length, the second length is 1-3 times of the first length, and the third length is 4-8 times of the first length.

In one embodiment, the first length is 10mm to 35mm, the second length is 10mm to 100mm, and the third length is 40mm to 270mm, where the first length, the second length, and the third length are lengths of the first region, the second region, and the third region, respectively, in a direction away from the light incident surface.

A backlight module comprises the light guide plate.

A display device comprises the backlight module.

Compared with the prior art, the utility model discloses following beneficial effect has: the utility model discloses light guide plate, backlight unit and display device, simple structure, design benefit utilizes the first light guide structure of isostructure and second light guide structure's distribution layout, in reinforcing light guide plate luminance, avoids producing negative effects such as hot spot and dark angle, and backlight unit and display device that this type light guide plate was used can reduce the frame design, accomplish the effect of super narrow frame when promoting the light efficiency.

[ description of the drawings ]

Fig. 1 is a schematic distribution diagram of a first light guide structure and a second light guide structure according to an embodiment of the disclosure;

fig. 2 is a schematic structural diagram of a light guide plate according to an embodiment of the disclosure;

FIG. 3 is a schematic cross-sectional view of a light guide plate according to an embodiment of the disclosure;

FIG. 4 is a schematic cross-sectional view of another light guide plate according to an embodiment of the disclosure;

FIG. 5 is a schematic diagram of a light path of light reflected by the first light guide structure according to the embodiment of the disclosure;

FIG. 6 is a schematic diagram of a light path of light reflected by the second light guide structure according to the embodiment of the disclosure;

fig. 7 is a schematic structural view illustrating intersection of a first light guiding structure and a reflecting surface according to an embodiment of the disclosure;

fig. 8 is a schematic structural diagram of a second light guiding structure according to an embodiment of the disclosure;

fig. 9 is a schematic structural diagram of a first second light guiding structure according to an embodiment of the disclosure;

FIG. 10 is a schematic cross-sectional view of the second light guiding structure shown in FIG. 9;

fig. 11 is a schematic structural diagram of a second light guide structure according to an embodiment of the disclosure;

fig. 12 is a schematic cross-sectional view of the second light guiding structure shown in fig. 11;

fig. 13 is a schematic structural diagram of a third second light guiding structure according to an embodiment of the disclosure;

FIG. 14 is a cross-sectional view of the second light directing structure shown in FIG. 13;

fig. 15 is a schematic structural diagram of a fourth light guiding structure according to an embodiment of the disclosure;

fig. 16 is a cross-sectional view of the second light guiding structure shown in fig. 15;

fig. 17 is a schematic structural view of a fifth light guiding structure according to the embodiment of the present disclosure;

FIG. 18 is a cross-sectional schematic view of the second light directing structure shown in FIG. 17;

fig. 19 is a schematic view illustrating an included angle between a tangent plane and a reflection plane of a second light guiding structure according to an embodiment of the disclosure;

fig. 20 is a schematic distribution diagram of another first and second light guiding structures according to an embodiment of the disclosure;

fig. 21 is a schematic diagram illustrating a relationship between the light distribution ratio and the optical length of the first light guide structure and the second light guide structure according to the embodiment of the disclosure.

[ detailed description ] embodiments

It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the scope of the present application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention of the present application, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.

Referring to fig. 1 to 4, a light guide plate includes: the light guide plate comprises a light guide plate body 1, a first light guide structure 2 and a second light guide structure 3. The light guide plate body 1 is a main body structure of the light guide plate, is made of a light guide material and has a plurality of surfaces. The light guide plate body comprises a light incident surface 7 for receiving light beams and a reflecting surface 8 for reflecting the light beams, the light incident surface 7 is arranged on one side of the light guide plate body 1, and the light incident surface 7 is connected with the reflecting surface 8. The first light guide structures 2 and the second light guide structures 3 are distributed on the reflecting surface 8 of the light guide plate, wherein the distribution density of the first light guide structures 2 on the reflecting surface 8 is gradually reduced and the distribution density of the second light guide structures 3 on the reflecting surface 8 is gradually increased along the direction away from the light incident surface 7.

Specifically, referring to fig. 2, the light guide plate body 1 further includes a light emitting surface 9, and the light emitting surface 9 is disposed opposite to the reflecting surface 8. The light incident surface 7 is used for guiding light rays from the light source into the light guide plate body 1, the light rays enter the light guide plate body 1 from the light incident surface 7, and are respectively acted by the first light guide structure 2 and the second light guide structure 3 in the internal transmission process of the light guide plate body 1, and finally are emitted from the light emitting surface 9. The arrangement of the light incident surface 7 and the light emitting surface 9 is not described in detail in the prior art.

The first light guide structures 2 and the second light guide structures 3 are distributed on the light emitting surface 9 and/or the reflecting surface 8 in a random density manner, and a gap exists between the first light guide structures 2 and the second light guide structures 3.

In the present embodiment, referring to fig. 3 and 4, the first light guiding structure 2 includes a protrusion structure 21 and a second recess structure 22, and the second light guiding structure 3 includes a first recess structure having a first inclined surface 31 and a second inclined surface 32. The protruding structure 21 may be formed by upward protruding from the light guide plate body 1, or may be formed by fixing a protruding structure on the light guide plate body 1.

Referring to fig. 2, the direction away from the light incident surface 7 refers to the direction from the light incident surface 7 to the opposite surface on the light emitting surface 9 and/or the reflecting surface 8 of the light guide plate body 1. For example, the direction away from the light incident surface 7 is the direction D1 shown in fig. 2. Along the direction D1, the distribution density of the first light guiding structures 2 on the reflection surface 8 gradually decreases, the distribution density of the second light guiding structures 3 on the reflection surface 8 gradually increases, the distribution density of the first light guiding structures 2 on a first region of the reflection surface 8 and/or the light emitting surface 9 is greater than the distribution density of the first light guiding structures 2 on a second region of the reflection surface 8 and/or the light emitting surface 9, and the distribution density of the second light guiding structures 3 on the first region of the reflection surface 8 and/or the light emitting surface 9 is less than the distribution density of the second light guiding structures 3 on the second region of the reflection surface 8 and/or the light emitting surface 9, where the first region is closer to the light incident surface 7 than the second region. The first region and the second region may be regions with the same area size on the reflection surface 8 and/or the light emitting surface 9, or regions with different area sizes, and the area of the first region or the area of the second region may be set to a smaller area unit according to the actual application requirement, such as square millimeter, square micrometer, and the like, so as to more accurately control the distribution of the first light guiding structure 2 and the second light guiding structure 3 on the light guiding plate body 1.

Referring to fig. 5 and 6, based on the structural characteristics of the first light guiding structure 2 including the protrusion structure 21, when incident light passes through the first light guiding structure 2, the incident light is mainly scattered, and the light is angularly dispersed, so that the light path is long, the loss energy is large, and the exit angle is large; based on the structural characteristics of the second light guiding structure 3 including the first inclined surface 31, when incident light passes through the second light guiding structure 3, the incident light is mainly reflected, the light angles are concentrated, and the light brightness at a specific angle on the light emitting surface can be improved by 10%.

On one hand, the light guide plate of the embodiment of the application has the advantages that the first light guide structures 2 are randomly distributed on the reflecting surface 8, the distribution density design can be carried out in the first area according to the arrangement of the lamp beads, the number of the light guide structures among the lamp beads is increased, the number of the light guide structures right in front of the lamp beads is reduced, the top white defect of the surface of the light guide plate and the hot spots of the incident light are eliminated, and the local optical trend is adjusted; the distribution density of the second light guide structures 3 on the reflecting surface 8 is gradually increased, and the brightness gain of the light guide plate can be improved by utilizing the directional reflection function of the inclined surface 31; on the other hand, the first light guide structure 2 and the second light guide structure 3 are arranged in a matched manner, so that the light extraction efficiency of the light guide plate is enhanced, the brightness uniformity of the light guide plate can reach a basic value through the arrangement of the second light guide structure 3, the brightness uniformity of the light guide plate can further reach a target value through the first light guide structure 2, and the brightness uniformity required by the target value is greater than the brightness uniformity required by the basic value. Therefore, through the reasonable layout of the first light guide structure 2 and the second light guide structure 3, the scattering and reflection of the incident light by the light guide plate are comprehensively controlled, and the hot spot (HotSpot) phenomenon is avoided while the brightness of the light guide plate is enhanced.

In an embodiment, referring to fig. 7, the first light guiding structure 2 further includes a second recessed structure 22, the second recessed structure 22 is a circular recessed structure, the second recessed structure 22 intersects with the reflective surface 8 to form a ring, the ring includes an inner ring 221 and an outer ring 222, the outer ring 222 is the second recessed structure 22, and the inner ring 221 is the protruding structure 21; the projection of the relief structure 21 on the reflective surface 8 is located within the inner ring 221. Specifically, the radius of the inner ring 221 is smaller than that of the outer ring 222, the second concave structure 22 is arranged between the inner ring 221 and the outer ring 222, and the convex structure 21 is arranged in the inner ring 221; the projection of the relief structure 21 onto the reflective surface 8 is located within the inner ring 221 or on the inner ring 221. Finally, the first light guide structure 2 is convex in the middle and concave in the edge, so that the scattering effect can be further enhanced.

In one embodiment, the height of the raised structures 21 is 1.5 μm to 4.0 μm, preferably 1.5 μm + -0.3 μm, 2.0 μm + -0.3 μm, 3.0 μm + -0.3 μm, 4.0 μm + -0.5 μm, and the like.

In one embodiment, the first inclined surface 31 and the second inclined surface 32 of the second light guiding structure 3 are recessed inwards from the light guiding plate body 1 to form a first recessed structure. Specifically, referring to fig. 8, the second light guiding structure 3 has a crater shape in the middle (i.e., the first inclined surface 31), and the edge is a crater, and the specific height of the crater can be set according to actual needs.

In one embodiment, referring to fig. 9 to 18, the cross section of the second light guiding structure 3 is one of a rectangle, a drop, a C shape, a crescent, a disc shape and a bamboo joint shape, but is not limited thereto, and may be other shapes, which are not listed here. The longitudinal section of the second light guide structure 3 is in a V shape, and the regular section of the V shape can emit light rays to a specific direction, so that the energy distribution of the light rays is more concentrated, and the brightness of the positive emergent light of the light guide plate is favorably improved.

Referring to fig. 19, in one embodiment, the included angle (θ and/or γ) between the edge of the longitudinal section of the second light guide structure 3 and the reflective surface 8 is 10 ° to 30 °.

It can be understood that the angle between the first inclined surface 31 of the second light guiding structure 3 and the reflecting surface 8 ranges from 10 ° to 30 °, and the angle between the second inclined surface 32 of the second light guiding structure 3 and the reflecting surface 8 ranges from 10 ° to 30 °.

In one embodiment, the light guide plate body 1 has at least two regions divided by the reflective surface 8 along the direction away from the light incident surface, and the adjacent regions are communicated with each other. The first light guide structures 2 are at least distributed in an area close to one side of the light incident surface 7, and the second light guide structures 3 are at least distributed in an area close to one side of the opposite surface of the light incident surface. The first light guiding structure 2 located next to the light incident surface 7 helps to eliminate the hot spot problem. Specifically, the area of the light guide plate close to the light incident surface 7 is not provided with or is provided with a small amount of second light guide structures 3, so that the reflection and refraction of light are reduced, light rays are prevented from being gathered and formed at an entrance as far as possible, and the generation of hot spots is avoided. The remaining brightness required for the first region 4 may be provided by the first light guiding structure 2.

In an embodiment, referring to fig. 20 and 21, along the direction away from the light incident surface 7, the light reflecting surface 8 sequentially includes: a first zone 4, a second zone 5 and a third zone 6, arranged in sequence and communicating one behind the other. The distribution density of the first light guide structures 2 in the first region 4, the second region 5 and the third region 6 respectively decreases in sequence, that is, the distribution density of the first light guide structures 2 in the first region 4 is greater than that in the second region 5, and the distribution density of the first light guide structures 2 in the second region 5 is greater than that in the third region 6. The distribution density of the second light guide structures 3 in the first region 4, the second region 5 and the third region 6 respectively increases in sequence, that is, the distribution density of the second light guide structures 3 in the first region 4 is smaller than that in the second region 5, and the distribution density of the second light guide structures 3 in the second region 5 is smaller than that in the third region 6.

In one embodiment, only the first light guide structures 2 are distributed in the first region 4, only the second light guide structures 3 are distributed in the third region 6, and the first light guide structures 2 and the second light guide structures 3 are mixed and distributed in the second region 5. The first light guide structures 2 and the second light guide structures 3 which are mixed and distributed in the second area 5 are beneficial to eliminating a boundary line generated after two kinds of light guide are overlapped while ensuring the brightness gain and eliminating hot spots. Preferably, the first light guide structures 2 and the second light guide structures 3 are randomly distributed in the second region 5 to further enhance the scattering effect.

In one embodiment, the distribution density of the first light guide structures 2 in the first region 4, the second region 5 and the third region 6 respectively gradually decreases along the direction away from the light incident surface 7. Or the distribution density of the first light guide structures 2 in the first region 4, the second region 5 or the third region 6 respectively gradually decreases along the direction away from the light incident surface 7. The distribution density of the second light guide structures 3 in the first region 4, the second region 5 and the third region 6 gradually increases along the direction away from the light incident surface 7. Or the distribution density of the second light guide structures 3 in the first region 4, the second region 5, or the third region 6 gradually increases along the direction away from the light incident surface 7. In this embodiment, the decrease or increase of the distribution density of the first light guide structures 2 and the second light guide structures 3 refers to a decrease or an increase of the distribution density in the first region 4, the second region 5, or the third region 6 along the direction away from the light incident surface 7, rather than a difference of the densities among different regions.

In one embodiment, the lengths of the first, second and third regions 4, 5, 6 increase in order in a direction away from the light-incident surface 7. That is, when the direction away from the light incident surface 7 is the length direction, the length of the first region 4 is smaller than that of the second region 5, and the length of the second region 5 is smaller than that of the third region 6. The first light guide structures 2 in the first region 4 can eliminate hot spots only by being arranged according to a certain rule, and the required length is smaller than that of the second and third regions 6; the high-brightness microstructures of the third region 6 are used for providing brightness gain of the light guide plate, and the effective area needs to be larger than that of the second region 5.

In one embodiment, the lengths of the first, second and third regions 4, 5, 6 in a direction away from the light-incident surface 7 are first, second and third lengths, respectively. The second length is 1-3 times the first length and the third length is 4-8 times the first length.

In one embodiment, said first length is between 10mm and 35 mm; the second length is 10mm-100 mm; the third length is 40mm-270mm, and the specific length can be flexibly adjusted according to the design, and is not limited here.

In one embodiment, the light guide plate body 1 may be a rectangular parallelepiped and has a plurality of circumferentially distributed side surfaces and a pair of upper and lower distributed surfaces, at least one of the side surfaces is a light incident surface 7, and the surfaces are a reflection surface 8 and a light emitting surface 9, respectively. Wherein the first light guiding structure 2 and the second light guiding structure 3 are simultaneously located on the reflecting surface 8.

The application also discloses a backlight module, including above-mentioned arbitrary light guide plate. Specifically, the backlight module is a side-light type backlight module, and comprises a substrate, a plurality of lamp beads arranged on the substrate, a light guide plate, and a reflecting film positioned between the substrate and the light guide plate and used for reflecting light. Because the first light guide structure 2 is a protrusion structure, the distance between the light guide plate and the reflective film is the protrusion height of the first light guide structure 2, i.e. 1.5 μm-4.0 μm.

The protruding structure of light guide plate plane of reflection in this embodiment is greater than 1.5 mu m, when the user presses the liquid crystal display that this backlight unit prepared, light guide plate and reflectance coating contact, the appeal increases between light guide plate and the reflectance coating, form and press the bright spot, when the user unclamped liquid crystal display, the resilience of light guide plate is than the appeal very much, therefore light guide plate and reflectance coating can part immediately, will see the white point of touching department on the display screen like this and just disappear after the user unclamps liquid crystal display, user experience and result of use can not be influenced. The first light guide structure 2 of the light guide plate in the above embodiment has a protrusion height of 1.5 μm to 4.0 μm, and has relatively good light guide performance and anti-top-white function.

The application also discloses a display device, such as a computer and a mobile phone display screen, comprising the backlight module.

Compared with the prior art, the utility model discloses following beneficial effect has: the utility model discloses light guide plate, backlight unit and display device, simple structure, design benefit utilizes the first light guide structure of isostructure and second light guide structure's distribution overall arrangement, in reinforcing light guide plate luminance, avoids producing negative effects such as hot spot, and backlight unit and display device that this type light guide plate was used can reduce the frame design, accomplish the effect of super narrow frame when promoting the light efficiency.

In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.

Claims (12)

1. A light guide plate, comprising:

the light guide plate body comprises a light incident surface and a reflecting surface, and the light incident surface is connected with the reflecting surface;

the first light guide structure is formed on the reflecting surface and comprises a convex structure;

the second light guide structure is formed on the reflecting surface and comprises a first concave structure;

the first light guide structures are arranged on the reflecting surface, the second light guide structures are arranged on the reflecting surface, and the light incident surface is arranged on the second light guide structures.

2. The light guide plate according to claim 1, wherein the first light guiding structure further comprises a second recessed structure intersecting the reflective surface to form a ring shape, the ring shape comprising an inner ring and an outer ring, the outer ring being the second recessed structure, the inner ring being the protruding structure;

the projection of the convex structure on the reflecting surface is positioned in the inner ring.

3. The light guide plate according to claim 1 or 2, wherein the height of the protrusion structures is 1.5 μm to 4.0 μm.

4. The light guide plate according to claim 1, wherein the first concave structures are formed by inward recessing from the light guide plate body, the cross-sectional surface of the first concave structures is one of a rectangle, a drop shape, a C shape, a crescent shape, a dish shape and a bamboo joint shape, and the longitudinal sectional surface of the first concave structures is a V shape.

5. The light guide plate according to claim 1, wherein an angle between an edge of a longitudinal section of the first concave structure and the reflecting surface is in a range of 10 ° to 30 °.

6. The light guide plate according to claim 1, wherein the reflection surface sequentially comprises, in a direction away from the light incident surface: the light guide structure comprises a first area, a second area and a third area, wherein the distribution density of the first light guide structure in the first area, the second area and the third area is reduced in sequence, and the distribution density of the second light guide structure in the first area, the second area and the third area is increased in sequence.

7. The light guide plate according to claim 6, wherein the distribution density of the first light guide structures in the first region, the second region and/or the third region respectively gradually decreases along a direction away from the light incident surface; the distribution density of the second light guide structures in the first region, the second region and/or the third region is gradually increased along the direction far away from the light incident surface.

8. The light guide plate according to claim 6, wherein the first, second and third regions have lengths that increase in sequence in a direction away from the light incident surface.

9. The light guide plate according to claim 6, wherein the first, second and third regions have a first length, a second length and a third length respectively along a direction away from the light incident surface, the second length is 1-3 times the first length, and the third length is 4-8 times the first length.

10. The light guide plate according to claim 9, wherein the first length is 10mm to 35mm, the second length is 10mm to 100mm, and the third length is 40mm to 270mm, wherein the first length, the second length, and the third length are lengths of the first region, the second region, and the third region, respectively, in a direction away from the light incident surface.

11. A backlight module comprising the light guide plate according to any one of claims 1 to 10.

12. A display device comprising the backlight module according to claim 11.

Images