CN117518333A

CN117518333A - Light guide plate, backlight structure and display terminal

Info

Publication number: CN117518333A
Application number: CN202311203582.9A
Authority: CN
Inventors: 辛武根; 倪明明; 张凯琪
Original assignee: Suzhou China Star Optoelectronics Technology Co Ltd
Current assignee: Suzhou China Star Optoelectronics Technology Co Ltd
Priority date: 2023-09-18
Filing date: 2023-09-18
Publication date: 2024-02-06

Abstract

The application discloses a light guide plate, a backlight structure and a display terminal. The light guide plate comprises a first bottom surface, a light emergent surface and a light incident surface, and the first bottom surface is provided with an inwards concave lattice point structure; the light incident surface is connected with the first bottom surface and the light emergent surface; the net point structure comprises a first surface and a second surface, the first surface is a curved surface, the second surface is a round plane or an oval plane which is obliquely arranged, the first surface and the second surface are both intersected with the first bottom surface, the first surface and the second surface are intersected, and the second surface is arranged at one end of the net point structure, which is far away from the light incident surface. The first surface of the screen dot structure is a curved surface, the second surface is an inclined circular plane or an elliptical plane, and the second surface is deviated from the light incident surface, so that the surface of the first surface is close to 360 degrees, light rays incident on the light incident surface can be refracted towards all directions, the second surface can refract the light rays to a plurality of directions deviating from the light incident surface, the brightness of the light guide plate in the viewing angles in all directions is ensured, and the viewing angle requirement of the display terminal is met.

Description

Light guide plate, backlight structure and display terminal

Technical Field

The application relates to the technical field of display, in particular to a light guide plate, a backlight structure and a display terminal.

Background

The light guide plate can convert light rays emitted by the light source into collimated light for the display terminal. The light source can be arranged on the side surface of the light guide plate, the lower surface of the light guide plate is provided with lattice points, and the lattice points can refract and reflect light rays entering the light guide plate from the light source, so that the light rays entering from the side surface of the light guide plate are emitted along the upper surface of the light guide plate.

In order to enhance the brightness of the light guide plate, more light should be emitted from the upper surface of the light guide plate, wherein the shape of the dots is particularly important for the effect of the light emitting angle and the light emitting efficiency of the light. Although the collimation light guide plate in the related art can improve the brightness of the light guide plate, there are cases that the light emitting angle is converged in a single direction, and insufficient brightness exists in the side view angle range in other directions, so that the viewing angle of the display terminal in other directions can be reduced.

Therefore, there is a need to solve the above-mentioned technical problems.

Disclosure of Invention

The application provides a light guide plate, backlight structure and display terminal, can guarantee the play light brightness of light guide plate, can make the luminance of light guide plate in the visual angle within range of each direction satisfy the requirement again to satisfy the viewing angle requirement of display terminal.

In order to solve the technical problems, the technical scheme provided by the application is as follows:

the application provides a light guide plate, which comprises a light incident surface, a light emergent surface and a first bottom surface opposite to the light emergent surface, wherein the light incident surface is connected with the first bottom surface and the light emergent surface;

the light guide plate is provided with a plurality of concave lattice point structures on the first bottom surface, the concave directions of the lattice point structures face the light emitting surface, the lattice point structures comprise intersected first surfaces and second surfaces, the first surfaces are curved surfaces, the second surfaces are round planes or elliptical planes which are obliquely arranged, the first surfaces and the second surfaces are intersected with the first bottom surface, and the second surfaces are arranged at one ends of the lattice point structures, which deviate from the light emitting surface.

In the light guide plate of the application, the acute angle included angle between the second surface and the first bottom surface is larger than zero degrees and smaller than 90 degrees, the intersection line of the first surface and the first bottom surface is round or elliptical, and the orthographic projection of the first surface on the light incident surface is semicircular or semi-elliptical.

In the light guide plate of the present application, the orthographic projection of the dot structure on the first bottom surface is a first projection, and the length of the first projection in the first direction is greater than or equal to the width of the first projection in the second direction, where the first direction is a direction perpendicular to the light incident surface, and the second direction is a direction parallel to the first bottom surface and perpendicular to the first direction.

In the light guide plate of the present application, the first surface is a spherical surface or an ellipsoidal surface.

In the light guide plate of the application, the dot structure comprises a third surface, the third surface is a curved surface, the third surface is at least partially arranged at intervals with the first surface, and the third surface is intersected with the second surface and the first bottom surface.

In the light guide plate of the present application, the shape of the third surface is the same as the shape of the first surface.

In the light guide plate of the present application, the light guide plate is any one of a flat plate, a wedge plate, and a partial wedge plate.

In the light guide plate of the present application, the distribution density of the dot structures gradually increases in the direction away from the light incident surface.

The application also provides a backlight structure, which comprises a light source and the light guide plate, wherein the light emergent surface of the light source is close to the light incident surface of the light guide plate.

The application also provides a display terminal, the display terminal includes light source and foretell light guide plate, and the income plain noodles of light guide plate are pressed close to the play plain noodles of light source.

The beneficial effects are that: the application discloses a light guide plate, a backlight structure and a display terminal. The light guide plate comprises

The light-emitting device comprises a light-in surface, a light-out surface and a first bottom surface opposite to the light-out surface, wherein the light-in surface is connected with the first bottom surface and the light-out surface;

the light guide plate is provided with a plurality of concave lattice point structures on the first bottom surface, the concave directions of the lattice point structures face the light emitting surface, the lattice point structures comprise intersected first surfaces and second surfaces, the first surfaces are curved surfaces, the second surfaces are round planes or elliptical planes which are obliquely arranged, the first surfaces and the second surfaces are intersected with the first bottom surface, and the second surfaces are arranged at one ends of the lattice point structures, which deviate from the light emitting surface. According to the display terminal, the first face of the screen dot structure is the curved face, the second face is the inclined circular plane or the inclined oval plane, the second face is deviated from the light incident face, the surface of the first face is close to the 360-degree setting, light rays incident on the light incident face can be refracted towards all directions, the second face can refract the light rays to a plurality of directions deviating from the light incident face, accordingly brightness of the light guide plate in view angles in all directions is guaranteed, and viewing angle requirements of the display terminal are met.

Drawings

Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic perspective view of a light guide plate according to an embodiment of the present disclosure;

fig. 2 is a schematic perspective view of a dot structure of the first light guide plate in fig. 1;

FIG. 3 is a view of the dot structure of FIG. 2 from various perspectives;

fig. 4 is a schematic perspective view of a dot structure of a second light guide plate;

FIG. 5 is a schematic diagram of the dot structure of FIG. 4 from various view angles;

FIG. 6 is a schematic diagram illustrating the principle of the light guide plate of FIG. 1;

FIG. 7 is a schematic cross-sectional view of a backlight structure according to an embodiment of the present disclosure;

fig. 8 is a schematic cross-sectional structure of a display terminal according to an embodiment of the present application.

Reference numerals illustrate:

the light source comprises a light guide plate 10, light rays S of the light source, a first bottom surface 11, a light emitting surface 12, a light incident surface 13, a second side surface 14, a dot structure 100, a first surface 101, a second surface 102, an included angle A between the second surface and the first bottom surface, a third surface 103, a backlight structure 1, the light source 20, a back plate 30, a reflecting sheet 40, an optical film 50, a rubber frame 60, a liquid crystal display panel 70, a first direction D1 and a second direction D2.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower positions of the device in actual use or operation, and specifically the orientation of the drawing figures; while "inner" and "outer" are for the outline of the device.

The present application provides a light guide plate 10, as shown in fig. 1, the light guide plate 10 includes a first bottom surface 11, a light emitting surface 12 and a light entering surface 13 (a plane with a section line in the figure), where the first bottom surface 11 is provided with a plurality of mesh point structures 100 recessed inwards; the light incident surface 13 is connected with the first bottom surface 11 and the light emergent surface 12; the mesh point structure 100 includes a first surface 101 and a second surface 102, the first surface 101 is a curved surface, the second surface 102 is a circular plane or an elliptical plane that is obliquely arranged, the first surface 101 and the second surface 102 are both intersected with the first bottom surface 11, the first surface 101 and the second surface 102 are intersected, and the second surface 102 is arranged at one end of the mesh point structure 100 facing away from the light incident surface 13.

In this embodiment, as shown in fig. 1, 3 and 7, the first bottom surface 11 of the light guide plate 10 is opposite to the light emitting surface 12, the first bottom surface 11 is an upper surface, the upper surface is a light emitting surface, the light emitting surface 12 is a lower surface, and the lower surface is provided with a dot structure 100. The light incident surface 13 connects the first bottom surface 11 and the light emergent surface 12. The light incident surface 13 is a surface that receives the light S of the light source 20, and the light source 20 may be an LED or the like, but is not limited thereto. That is, the light source 20 may be disposed at a side surface of the light guide plate 10, and the light S of the light source 20 is incident into the light guide plate 10 from the light incident surface 13. The light guide plate 10 is capable of guiding the light S of the light source 20 to exit from the light exit surface 12 of the light guide plate 10 for providing a surface light source for a display terminal or the like.

In this embodiment, the dots are recessed toward the inside of the light guide plate 10 with respect to the first bottom surface 11. The dot structure 100 includes a first side 101 and a second side 102, wherein the first side 101 is a curved surface and the second side 102 is a planar surface.

Alternatively, the first face 101 is a cylindrical surface, a spherical surface, an ellipsoidal surface, or the like. When the first face 101 is spherical or ellipsoidal, it can have a larger surface area, so that more light can be reflected.

The second surface 102 is disposed obliquely with respect to the first bottom surface 11, and intersects the first bottom surface 11 and the first surface 101. The second surface 102 may be inclined at an acute angle with respect to the first bottom surface 11, and the first surface 101 is disposed in an acute angle space formed between the second surface 102 and the first bottom surface 11. The first face 101 intersects both the second face 102 and the first bottom face 11.

In other embodiments, the dots may also protrude toward the outside of the light guide plate 10 with respect to the first bottom surface 11.

For convenience of description, the first direction D1 and the second direction D2 are defined on the first bottom surface 11, and the surface of the light guide plate 10 opposite to the light incident surface 13 is defined as the second side surface 14. The first direction D1 is a direction from the light incident surface 13 to the second side surface 14, that is, the first direction D1 is perpendicular to the light incident surface 13. The second direction D2 is perpendicular to the first direction D1 and parallel to the light incident surface 13.

In this embodiment, the second surface 102 is disposed at an end of the dot structure 100 facing away from the light incident surface 13. That is, the second surface 102 is disposed facing the second side surface 14, and the first surface 101 is disposed facing the light incident surface 13. In order to better explain the positional relationship between the first surface 101 and the second surface 102 with respect to the light incident surface 13, one of the dot structures 100 will be described as an example. Assuming that both the first surface 101 and the second surface 102 are opaque, when the light S from the light source 20 is incident along the first direction D1, the light S irradiates the first surface 101 and is blocked by the first surface 101, so that the second surface 102 cannot be irradiated onto the second surface 102, that is, the second surface 102 is located at an end of the dot structure 100 facing away from the light incident surface 13.

In this application, since the first surface 101 is a closed curved surface, the first surface 101 is disposed near 360 degrees, and the light S of the light source 20 can be refracted in all directions, so that the brightness of the light guide plate 10 in the viewing angle range in all directions can meet the requirements. The second surface 102 is a circular plane or an elliptical plane, and the second surface 102 is disposed away from the light incident surface 13, so that the light S of the light source 20 can be directed toward the second side surface 14, and the brightness in the viewing angle range in the direction from the light incident surface 13 to the second side surface 14 can meet the requirement, thereby meeting the viewing angle requirement of the display terminal.

Alternatively, the dot structure 100 is disposed about a first axis of symmetry parallel to the first direction D1. With the above arrangement, the viewing angle of the light guide plate 10 in the second direction D2 can be made symmetrical.

In the present embodiment, the material of the light guide plate 10 may be polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene terephthalate (PET), polyvinyl alcohol (PVA), polyimide (PI), or the like, but is not limited thereto. The light guide plate 10 may be manufactured by conventional methods in the art, for example, it may be manufactured by injection molding, hot pressing, 3D printing, laser processing, extrusion molding, gluing, precision coating, etc., and the manufacturing process of the light guide plate 10 is not limited in this application.

In the light guide plate 10 of the present application, as shown in fig. 2 and 3, an acute included angle a between the second surface and the first bottom surface is greater than zero degrees and less than 90 degrees, an intersection line between the first surface 101 and the first bottom surface 11 is a circle or an ellipse, and an orthographic projection of the first surface 101 on the light incident surface 13 is a semicircle or a semi-ellipse.

In this embodiment, as shown in fig. 2 and 3, fig. 2 and 3 show the dot structure 100 of the first light guide plate 10 provided in the embodiment of the present application, where fig. 2 is a three-dimensional structure of the dot structure 100 of the first light guide plate 10, fig. 3 (a) is a front view of the dot structure 100 of the first light guide plate 10, fig. 3 (b) is a right view of the dot structure 100 of the first light guide plate 10, and fig. 3 (c) is a top view of the dot structure 100 of the first light guide plate 10.

As shown in fig. 3 (a), the included angle a between the second surface and the first bottom surface is greater than zero degrees and less than 90 degrees when viewed from the front view direction. The first surface 101 is disposed in an acute included angle formed by the second surface 102 and the first bottom surface 11.

As shown in fig. 3 (b), the front projection of the first surface 101 on the light incident surface 13 is semi-elliptical when viewed from the right side.

As shown in fig. 3 (c), the side of the first surface 101 intersecting the first bottom surface 11 is formed in an elliptical shape on the first bottom surface 11 as seen in a plan view.

In fig. 3, when the second surface 102 is elliptical, and when the second surface 102 is circular, the side where the first surface 101 intersects the first bottom surface 11 correspondingly surrounds the first bottom surface 11 to form a circle, and the front projection of the first surface 101 on the light incident surface 13 is semicircular.

In the light guide plate 10 of the present application, as shown in fig. 3, the orthographic projection of the dot structure 100 on the first bottom surface 11 is a first projection, and the length of the first projection in the first direction D1 is greater than or equal to the width of the first projection in the second direction D2. With reference to the foregoing definition, the direction perpendicular to the light incident surface 13 is herein the first direction, and the direction parallel to the light incident surface 13 is the second direction.

In some embodiments, the second surface 102 is elliptical, and the external dimension of the dot structure 100 in the direction perpendicular to the light incident surface 13 is greater than the external dimension of the dot structure 100 in the direction parallel to the light incident surface 13. Through the above arrangement, the brightness of the light guide plate 10 in the viewing angle in the second direction D2 can be ensured, and viewing angle requirements of the display terminal can be satisfied.

In some embodiments, the second surface 102 is circular, and the external dimension of the dot structure 100 in the direction perpendicular to the light incident surface 13 is equal to the external dimension of the dot structure 100 in the direction parallel to the light incident surface 13.

It should be noted that, when the second surface 102 is the same, the relationship between the external dimensions of the dot structure 100 in the first direction D1 or the second direction D2 determines the utilization ratio of the light in the first direction D1 or the second direction D2 by the dot structure 100. When the brightness of the light guide plate 10 in a certain viewing angle in the first direction D1 needs to be increased, correspondingly increasing the outline dimension of the dot structure 100 in the first direction D1 and reducing the outline dimension of the dot structure 100 in the second direction D2; when the brightness of the light guide plate 10 in the second direction D2 needs to be increased, the external dimension of the dot structure 100 in the second direction D2 is correspondingly increased, and the external dimension of the dot structure 100 in the first direction D1 is reduced.

The relationship between the external dimensions of the dot structure 100 in the first direction D1 and the second direction D2 may be adjusted according to actual needs, which is not limited in this application.

In the light guide plate 10 of the present application, as shown in fig. 4 and 5, the dot structure 100 includes a third surface 103, the third surface 103 is a curved surface, the third surface 103 is sleeved inside the first surface 101, the third surface 103 is at least partially spaced from the first surface 101, and the third surface 103 intersects with both the second surface 102 and the first bottom surface 11.

In this embodiment, as shown in fig. 4 and 5, fig. 4 and 5 show the dot structure 100 of the second light guide plate 10 provided in the embodiment of the present application, where fig. 4 is a three-dimensional structure of the dot structure 100 of the second light guide plate 10, fig. 5 (a) is a front view of the dot structure 100 of the second light guide plate 10, fig. 5 (b) is a right side view of the second dot structure 100, and fig. 5 (c) is a top view of the dot structure 100 of the second light guide plate 10. The dot structure 100 of the second light guide plate 10 is different from the first dot structure 100 in that it further includes a third surface 103.

The third face 103 intersects the second face 102 to form a circle or oval on the second face 102. The edge of the third surface 103 intersecting the second surface 102 may intersect the first bottom surface 11 or be spaced apart. Fig. 4 shows a case where an edge of the third surface 103 intersecting the second surface 102 intersects the first bottom surface 11.

The third surface 103 is sleeved inside the first surface 101, and the third surface 103 and the first surface 101 are at least partially spaced from each other, which means that the third surface 103 is surrounded by the first surface 101, and the third surface 103 and the first surface 101 are in contact with each other at part of the surface and are not in contact with each other at the other part of the surface. When the third surface 103 is spaced from the first surface 101, the air can be contained in the gap between the third surface 103 and the first surface 101, so that a critical surface is formed between the air and the third surface, the light can be reflected or refracted on the critical surface, the light can be further refracted or reflected to different angles, and the light emitting efficiency and the brightness of the light guide plate 10 are improved.

Alternatively, the side of the third face 103 intersecting the first bottom face 11 is rounded or elliptical on the first bottom face 11.

In the light guide plate 10 of the present application, the shape of the third surface 103 is the same as the shape of the first surface 101.

In the present embodiment, the shape of the third face 103 is the same as the shape of the first face 101. That is, when the side where the first surface 101 intersects the first bottom surface 11 is rounded on the first bottom surface 11 and the front projection of the first surface 101 on the light incident surface 13 is semicircular, the side where the third surface 103 intersects the first bottom surface 11 is rounded on the first bottom surface 11 and the front projection of the third surface 103 on the light incident surface 13 is semicircular. When the side where the first surface 101 intersects with the first bottom surface 11 encloses an ellipse on the first bottom surface 11, and the front projection of the first surface 101 on the light incident surface 13 is a half ellipse, the side where the third surface 103 intersects with the first bottom surface 11 also encloses an ellipse on the first bottom surface 11, and the front projection of the third surface 103 on the light incident surface 13 is a half ellipse.

It should be appreciated that the edges of the third face 103 intersecting the first bottom face 11, and the edges of the first face 101 intersecting the first bottom face 11 may both be spaced apart.

In the light guide plate 10 of the present application, the light guide plate 10 is any one of a flat plate, a wedge plate, and a partial wedge plate.

When the light guide plate 10 is a flat plate, the light guide plate 10 has a uniform thickness, i.e. the first bottom surface 11 and the light emitting surface 12 have a uniform distance, and the first bottom surface 11 is parallel to the light emitting surface 12.

When the light guide plate 10 is a wedge-shaped plate, the thickness of the light guide plate 10 at the end close to the light incident surface 13 is greater than the thickness of the light guide plate 10 at the end far from the light incident surface 13, that is, the thickness of the light guide plate 10 in the direction far from the light incident surface 13 is gradually reduced, that is, the distance between the first bottom surface 11 and the light emergent surface 12 in the direction far from the light incident surface 13 is gradually reduced.

When the light guide plate 10 is a partial wedge plate, the light guide plate 10 has the characteristics of the two light guide plates 10, that is, a section of the light guide plate 10 near the light incident surface 13 is a wedge plate, a section connected with the wedge plate is a flat plate, and the flat plate is disposed at one end of the wedge plate far away from the light incident surface 13. The thickness of the flat plate is equal to the minimum thickness of the wedge-shaped section.

In the various types of light guide plates 10 described above, the first bottom surface 11 and the light exit surface 12 are relatively large planes on the upper and lower sides of the guide plate 10. For example, when the light guide plate 10 is a partial wedge plate, the upper surface of the flat plate is a first bottom surface 11, and the lower surface of the flat plate is a light emitting surface 12.

Since the brightness of the light guide plate 10 at the end close to the light source 20 is greater than the brightness of the light guide plate 10 at the end far from the light source 20, the distribution density of the dot structure 100 needs to be adjusted in order to make the brightness of the light guide plate 10 at the light exit surface 12 uniform. The distribution density of the dot structures 100 refers to the number of dot structures 100 distributed in a unit area, and the larger the distribution density is, the larger the number of dot structures 100 distributed in a unit area is.

In the light guide plate 10 of the present application, the distribution density of the dot structure 100 gradually increases in a direction away from the light incident surface 13. With the above arrangement, the brightness of the light guide plate 10 on the light incident surface 13 and the light incident surface 13 can be balanced, so that the brightness of the light guide plate 10 is uniform.

The light guide plate 10 of the present application will be described below with respect to the principle of action of light.

The refractive index of the material of the light guide plate 10 is generally greater than that of air. For example, PMMA has a refractive index of 1.5, polycarbonate has a refractive index of about 1.6, and air has a refractive index of about 1. The surface of the dot structure 100 facing away from the light-emitting surface 12 contacts air. Therefore, the refractive index of the material is different between the first surface 101 and the second surface 102, and the light is refracted and reflected on the first surface 101 and the second surface 102. When light is incident from a material with a larger refractive index into a material with a smaller refractive index, total reflection of the light occurs when the condition that the incident angle is larger than the critical angle is satisfied.

As shown in fig. 6, for the first light guide plate 10, the first surface 101 is curved, and the first surface 101 is curved in a plurality of directions. The light incident from the light incident surface 13 irradiates onto the first surface 101, and the included angle between part of the light and the first surface 101 is larger than the critical angle, so that total reflection occurs, the other part of the light does not meet the condition of total reflection, refraction or reflection occurs, and part of the refracted light enters into the concave space of the dot structure 100. Generally, a reflective sheet 40 is disposed below the light guide plate 10, and the reflective sheet 40 can reflect light entering into the concave space of the dot structure 100, so that the light is refracted or reflected by the dot structure 100 again. The exit angle of the reflected light is changed, so that the light can be refracted or reflected by the first surface 101 or the second surface 102, the angle of the light is changed again, and the uniformity of the light guide plate 10 is improved.

Since the first surface 101 is disposed near 360 degrees, the first surface 101 can refract or reflect light into various directions, and ensure brightness of the light guide plate 10 in viewing angles in various directions.

It should be noted that, since a portion of the light entering the concave space of the dot structure 100 is incident on the second surface 102, and the second surface 102 is disposed obliquely, and the refractive index of the air in the concave space is smaller than that of the material of the light guide plate 10, the light is refracted on the second surface 102, and the refracted light deflects toward the direction close to the normal of the second surface 102, so that the light is converged within a certain angle range close to the normal of the second surface 102, and the brightness within the angle range is improved.

By setting the angle of the included angle a between the second surface and the first bottom surface, the angle of light exiting from the second surface 102 can be adjusted, so as to adjust the viewing angle range in the direction away from the light incident surface 13 and the brightness of the corresponding viewing angle.

For the second type light guide plate 10, the second type light guide plate 10 has a third face 103 added to the first type light guide plate 10. Air is provided between the third surface 103 and the second surface 102, and the third surface 103 and the air form another critical surface, so that light can be refracted and reflected again on the third surface 103. That is, in the dot structure 100 of the second light guide plate 10, light entering into the concave space of the dot structure 100 can be refracted and reflected on the third surface 103, so that the light is further refracted or reflected to different angles, and the light extraction efficiency and the brightness of the light guide plate 10 are improved, compared with the dot structure 100 of the first light guide plate 10.

The present application further provides a backlight structure 1, as shown in fig. 7, where the backlight structure 1 includes a light source 20 and the light guide plate 10, and a light emitting surface of the light source 20 is close to a light incident surface 13 of the light guide plate 10. The light source 20 may be an LED or the like, but is not limited thereto.

In this embodiment, the backlight structure 1 is a side-in backlight. The backlight structure 1 comprises a back plate 30, a reflecting sheet 40, a light guide plate 10, an optical film 50, a glue frame 60 and a light source 20, wherein the light source 20 is arranged close to the light incident surface 13 of the light guide plate 10, the glue frame 60 is positioned between the back plate 30 and a liquid crystal display panel 70, and the back plate 30 and the glue frame 60 form an accommodating space for accommodating the reflecting sheet 40, the light guide plate 10 and the optical film 50 which are sequentially stacked. The reflective sheet 40 serves to reflect light. The optical film 50 may be one optical film or a plurality of optical films. For example, the optical film may be a prism sheet, a diffusion sheet, or the like. The prism sheet can be used for brightening, and the diffusion sheet is used for diffusing light so that the light of the backlight structure 1 is more uniform.

The application further provides a display terminal, as shown in fig. 8, the display terminal includes a light source 20 and the light guide plate 10, where the light emitting surface of the light source 20 is close to the light incident surface 13 of the light guide plate 10. The light source 20 may be an LED or the like, but is not limited thereto. The display terminal may be a liquid crystal display device, a reflective display device, or the like.

In this embodiment, as shown in fig. 8, the display terminal is a liquid crystal display device. The liquid crystal display device includes a liquid crystal display panel 70 and a backlight structure 1. The backlight structure 1 is used to provide a surface light source for the liquid crystal display panel 70. The light guide plate 10 is disposed in the backlight structure 1.

In this embodiment, the display terminal is a reflective display device. The light guide plate 10 is disposed on the display surface side of the liquid crystal display panel 70, and the light emitting surface of the light source 20 is close to the light incident surface 13 of the light guide plate 10, i.e. the light source 20 and the light guide plate 10 are used for providing a front light source for the liquid crystal display panel 70.

In other types of display terminals, the position of the light guide plate 10 may be adjusted as desired. The application does not limit the type of the display terminal.

In this embodiment, the display terminal may be: any product or component with display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The light guide plate, the backlight structure and the display terminal provided by the embodiment of the application are described in detail, and specific examples are applied to explain the principle and implementation of the application, and the description of the above embodiments is only used for helping to understand the technical scheme and core ideas of the application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The light guide plate is characterized by comprising a light incident surface, a light emergent surface and a first bottom surface opposite to the light emergent surface, wherein the light incident surface is connected with the first bottom surface and the light emergent surface;

2. The light guide plate of claim 1, wherein an acute angle between the second surface and the first bottom surface is greater than zero degrees and less than 90 degrees, an intersecting first bottom surface line of the first surface and the first bottom surface is circular or elliptical, and an orthographic projection of the first surface on the light incident surface is semicircular or semi-elliptical.

3. A light guide plate as recited in claim 2, wherein said mesh point structure comprises a third face, said third face being a curved surface, said third face being at least partially spaced from said first face, said third face intersecting both said second face and said first bottom face.

4. A light guide plate as claimed in claim 3, wherein the third face has the same shape as the first face.

5. A light guide plate as claimed in claim 1, wherein the dot structure has a distribution density gradually increasing in a direction away from the light incident surface.

6. The light guide plate of claim 1, wherein the orthographic projection of the dot structure on the first bottom surface is a first projection, and a length of the first projection in a first direction is greater than or equal to a width of the first projection in a second direction, wherein the first direction is a direction perpendicular to the light incident surface, and the second direction is a direction parallel to the first bottom surface and perpendicular to the first direction.

7. A light guide plate according to any one of claims 1 to 6, wherein the first face is a spherical or ellipsoidal face.

8. A light guide plate according to any one of claims 1 to 6, wherein the light guide plate is any one of a flat plate, a wedge plate, and a partial wedge plate.

9. A backlight structure comprising a light source and the light guide plate according to any one of claims 1 to 8, wherein a light exit surface of the light source is proximate to a light entrance surface of the light guide plate.

10. A display terminal comprising a light source and the light guide plate according to any one of claims 1 to 8, wherein a light exit surface of the light source is proximate to a light entrance surface of the light guide plate.