CN116626801A - Light guide plate, backlight module and display module - Google Patents

Abstract

The present invention relates to the field of display modules, and more particularly, to a light guide plate, a backlight module, and a display module. The light guide plate comprises a main body plate and a plurality of triangular prisms, wherein the triangular prisms are arranged on the upper end face of the main body plate side by side along the first direction, and the lengths of the triangular prisms extend along the second direction. The first direction is parallel to the incident direction of the light source light rays and is perpendicular to the second direction; the triangular prism is provided with a reflecting inclined plane, and an acute angle between the reflecting inclined plane and the upper end surface of the main body plate is 10-20 degrees. The upper end face of the main body plate is provided with a plurality of arc grooves which are arranged at intervals along the second direction, and the arc grooves are gradually narrowed along the first direction. By increasing the slope angle of the triangular prism, the light guide plate can be assembled with the traditional film bodies such as the diffusion film, the prism film and the like, and the assembly property of the light guide plate is improved. Meanwhile, the scratch resistance of the light guide plate is improved by arranging the arc grooves. The backlight module and the display module improve the brightness, the assembly and the scratch resistance of the light guide plate through the light guide plate.

Description

A light guide plate, a backlight module and a display module

technical field

The invention relates to the technical field of display modules, in particular to a light guide plate, a backlight module and a display module.

Background technique

The light guide plate is used to convert the side incident light source into a surface light source. One side of the light guide plate is used as the incident surface of the light source light, one end surface of the light guide plate in the thickness direction is used as the reflection surface of the light source light, and the other end surface in the thickness direction is The exit surface of the light source.

At present, a plurality of prisms (ie, knurls) are arranged side by side on the reflective surface of the collimating light guide plate along a direction perpendicular to the incident surface. Through the reflection of the light on the inclined surface of the prism, the traveling direction of the light source light introduced into the light guide plate is adjusted, so that the light source light is emitted from the exit surface of the light guide plate. Since the included angle (also referred to as slope angle) between the inclined surface of the prism on the collimating light guide plate and the emitting surface is relatively small, generally within 3°. In order to ensure that the light guide plate has sufficient luminance, the collimated light guide plate is generally used with an inverse prism optical film. The problem with existing collimated light guide plates is that they can only be used with reverse prism optical films, and it is difficult to assemble them with traditional diffusion films, prism films, etc. At the same time, the prism structure on the light guide plate makes its scratch resistance significantly weaker than that of ordinary light guide plates.

Contents of the invention

The object of the present invention is to provide a light guide plate, a backlight module and a display module, so that the light guide plate has higher luminance, and the adaptability and scratch resistance of the light guide plate are improved.

For reaching this purpose, the technical scheme adopted in the present invention is:

A light guide plate, comprising a main body plate and a plurality of triangular prisms, a plurality of triangular prisms are arranged side by side along a first direction at the lower end of the main body plate, and the length of the triangular prisms extends along a second direction; the first One direction is parallel to the incident direction of light from the light source and is perpendicular to the second direction; the triangular prism has a reflective slope inclined downward along the first direction, and the reflective slope is connected to the exit surface of the main body plate The included acute angle is 10°～20°;

The lower end of the main body plate has a plurality of arc grooves arranged at intervals along the second direction, and the arc grooves are gradually narrowed along the first direction.

As a preferred solution, the triangular prism also has an auxiliary inclined plane connected to the reflective inclined plane at an angle, and the auxiliary inclined plane of each triangular prism is also connected to the reflective inclined plane of an adjacent triangular prism. connected at an angle so that a plurality of the triangular prisms form a tooth-like structure.

As a preferred solution, the acute angle formed by the auxiliary inclined surface and the emitting surface of the main body plate is 70°-80°.

As a preferred solution, the included angle between the auxiliary slope and the reflecting slope is 70°-90°.

As a preferred solution, the distance between two adjacent tooth tips in the tooth-shaped structure is 30 μm-70 μm.

As a preferred solution, the diameter of the large port of the arc groove is 40 μm-60 μm, and the diameter of the small port is 8 μm-28 μm.

As a preferred solution, the distance between two adjacent arc grooves is 60 μm˜100 μm.

As a preferred solution, the groove depth of the arc groove is 5 μm˜15 μm.

A backlight module, the backlight module includes a light source and the above-mentioned light guide plate, the light source is adjacently arranged on one side of the light incident surface of the light guide plate.

A display module includes the above-mentioned backlight module.

The beneficial effects of the present invention are:

A light guide plate proposed by the present invention, the light guide plate includes a main body plate and a plurality of triangular prisms, a plurality of triangular prisms are arranged side by side along the incident direction of the light source light at the lower end of the main body plate, and the length of the triangular prism is along the direction perpendicular to the incident light source light direction extension. Since the acute angle (slope angle) between the reflection slope of the triangular prism and the exit surface of the main body plate is 10° to 20°, which is much larger than the slope angle of 3° of the existing collimated light guide plate, it will be reflected by the reflection slope and emitted from the exit surface. The acute angle between the emitted light source light and the exit surface becomes larger, which increases the vertical component of the emitted light source light on the exit surface, thereby increasing the brightness of the light guide plate, making the light guide plate compatible with traditional diffusion films, prism films, etc. After the body is assembled, it has higher luminance, which improves the assembly property of the light guide plate. At the same time, the arc groove can reduce the area of the reflective slope, reducing the risk of the light guide plate being scratched, and the inner wall of the arc groove is a concave arc shape, which has a good anti-scratch effect and further improves the durability of the light guide plate. Scratch. In addition, the arc groove gradually narrows along the incident direction of light from the light source, so that the area of the reflective slope of the triangular prism farther away from the light source is larger, thereby making up for the disadvantage of the decrease in the brightness of the light from the light source, and realizing the uniform light guide of the light guide plate.

A backlight module provided by the present invention includes the above-mentioned light guide plate, so that the light guide plate can have higher luminance after being assembled with traditional diffusion film, prism film, etc., and the assembly property of the light guide plate is improved. At the same time, the scratch resistance of the light guide plate is improved, and uniform light guide is realized.

A display module proposed by the present invention includes the above-mentioned backlight module, which enables the light guide plate to have higher luminance after being assembled with traditional diffusion film, prism film, etc., and improves the assembly property of the light guide plate. At the same time, the scratch resistance of the light guide plate is improved, and uniform light guide is realized.

Description of drawings

FIG. 1 is a schematic structural view of a light guide plate provided by an embodiment of the present invention;

Fig. 2 is a back view of the light guide plate provided by the embodiment of the present invention;

Fig. 3 is the front view of the inverted guide plate provided by the embodiment of the present invention;

Fig. 4 is a side view of an inverted guide plate provided by an embodiment of the present invention.

The names and labels of the components in the figure are as follows:

1. Main board; 11. Light incident surface; 2. Triangular prism; 21. Reflective slope; 22. Auxiliary slope; 3. Arc groove.

Detailed ways

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all of them.

In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this embodiment, the terms "up", "down", "right", and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operations, rather than indicating Or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

This embodiment proposes a backlight module, which is mainly used in a display module to provide a backlight for a display screen to ensure a clear display function of the display screen. Of course, the backlight module can also be applied to other devices or products, which is not specifically limited here.

Specifically, the backlight module includes a light source and a light guide plate, and the light source is adjacently disposed on one side of the light incident surface of the light guide plate. One of the side surfaces of the light guide plate is used as the incident surface of the light source light, one end surface of the light guide plate along the thickness direction is used as the reflection surface of the light source light, and the other end surface in the thickness direction is used as the exit surface of the light source light.

The slope angle of the prisms of the existing collimating light guide plate is relatively small, generally within 3°. In order to ensure that the collimated light guide plate has sufficient brightness, the collimated light guide plate is generally used with an inverse prism optical film. The problem existing in the existing collimating light guide plate is that it can only be used with the reverse prism optical film, and it is difficult to assemble with traditional diffusion film, prism film and other films, and the adaptability is poor. At the same time, the prism structure on the light guide plate makes its scratch resistance significantly weaker than that of ordinary light guide plates.

In order to solve the above problems, as shown in Figures 1 to 3, this embodiment also proposes a light guide plate, the light guide plate includes a main board 1 and a plurality of triangular prisms 2, the light from the light source can pass through the light incident surface on the main board 1 11 injections. A plurality of triangular prisms 2 are arranged side by side along the first direction (the X-axis direction in the figure) at the lower end of the main body plate 1 , and the length of the triangular prisms 2 extends along the second direction (the Y-axis direction in the figure). The first direction is parallel to the incident direction of light from the light source and perpendicular to the second direction. The triangular prism 2 has a reflective slope 21 inclined downward along the first direction, and the acute angle (slope angle) α formed between the reflective slope 21 and the emitting surface of the main body plate 1 is 10°-20°. The lower end of the main body plate 1 has a plurality of arc grooves 3 arranged at intervals along the second direction, and the arc grooves 3 gradually narrow along the first direction.

Specifically, a plurality of triangular prisms 2 are arranged side by side along the incident direction of light from the light source at the lower end of the main board 1 , and the length of the triangular prisms 2 extends along the Y-axis direction. Since the slope angle of the triangular prism 2 is 10°-20°, which is much larger than the slope angle of 3° of the existing collimated light guide plate, the acute angle between the light source light reflected by the reflective slope 21 and emitted from the exit surface and the exit surface Larger, the vertical component of the emitted light source light on the exit surface is increased, thereby increasing the brightness of the light guide plate, so that the light guide plate can have higher brightness after being assembled with traditional diffusion film, prism film and other films, improving The assembly of the light guide plate is improved. At the same time, the arc groove 3 can reduce the area of the reflective slope 21, reducing the risk of the light guide plate being scratched, and the inner wall of the arc groove 3 is a concave arc shape, which has a good anti-scratch effect and further improves the light guide plate. Scratch resistance of bare panels. In addition, the circular arc groove 3 gradually narrows along the X-axis direction, so that the area of the reflective slope 21 farther away from the light source is larger, thereby making up for the disadvantage of the decrease in the light brightness of the light source, and realizing uniform light guide of the light guide plate.

As shown in Figures 1 and 3, the triangular prism 2 also has an auxiliary inclined plane 22 connected at an angle with the reflective inclined plane 21, and the auxiliary inclined plane 22 of each triangular prism 2 is also connected to the reflective inclined plane 21 of an adjacent triangular prism 2. They are connected at an included angle so that a plurality of triangular prisms 2 form a tooth-like structure.

Specifically, the acute angle β formed between the auxiliary inclined surface 22 and the emitting surface of the main body plate 1 is 70°-80°, and the included angle γ between the auxiliary inclined surface 22 and the reflecting inclined surface 21 is 70°-90°, so that the reflecting inclined surface 21 has a larger The area, that is, increases the reflection area of light from the light source, which is conducive to improving the brightness of the light guide plate.

It should be noted that the above-mentioned triangular prism 2 can be molded at equal intervals with a triangular diamond cutter or an alloy cutter, so as to improve the processing efficiency and processing quality of the light guide plate. Specifically, the distance between two adjacent tooth tips in the tooth-shaped structure is 30 μm˜70 μm. Of course, the distance between two adjacent tooth tips in the tooth-shaped structure can also be flexibly selected according to actual needs, which is not specifically limited here.

The circular arc groove 3 in this embodiment is processed vertically and cross-cutting parallel to the Y-axis direction by an arc knife, and the radius of the arc knife is about 80 μm to 100 μm. Of course, arc cutters with different radii can also be flexibly selected according to actual processing needs.

Specifically, the groove depth of the arc groove 3 is 5 μm to 15 μm, so that the arc groove 3 has a suitable groove depth to improve the quality of the light guide plate, and at the same time, it can avoid the difficulty of processing the arc groove 3 due to too small groove depth , and can also prevent the excessive groove depth from affecting the structural strength of the light guide plate. Preferably, the depth of the arc groove 3 may be 10 μm.

Furthermore, the distance between two adjacent circular arc grooves 3 is 60 μm-100 μm, so as to ensure that the lower end of the main board 1 has a sufficiently large reflective slope 21 , so as to ensure that the light guide plate has a higher luminance.

As shown in FIG. 1 , FIG. 2 and FIG. 4 , the diameter of the large port of the arc groove 3 is 40 μm to 60 μm, and the diameter of the small port is 8 μm to 28 μm. Preferably, the diameter of the large port of the arc groove 3 in this embodiment is 50 μm, and the diameter of the small port is 18 μm. Since the large end of the arc groove 3 is close to the light source and the small end is far away from the light source, the area of the reflective slope 21 on the light guide plate increases as the distance from the light source increases to ensure uniform light guide.

It should be noted that the main manufacturing processes of the light guide plate include: hot pressing process, laser direct writing process and injection molding process. Since the hot pressing process and the laser direct writing process are limited by the mold processing capacity and mold transfer rate, although the production efficiency of both is higher than that of the injection molding process, the brightness is not high, and it is difficult to meet the needs of high-brightness displays. . Although the injection molding process has advantages over the above two processes in mold processing and transfer rate, its production efficiency is low, and the products are generally not scratch-resistant. However, the light guide plate of this embodiment can adopt the roll-to-roll UV embossing process to achieve high-efficiency production, while ensuring a high mold transfer rate and brightness, and ensuring that the light guide plate has good scratch resistance.

This embodiment also proposes a display module, the display module includes the above-mentioned backlight module, the light guide plate in the backlight module can have higher luminance after being assembled with traditional diffusion film, prism film, etc. The assembly and scratch resistance of the light guide plate are improved, so that the light guide plate realizes uniform light guide.

The above embodiments only set forth the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. On the premise of not departing from the spirit and scope of the present invention, the present invention also has various changes and changes. These changes and changes are all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. The light guide plate is characterized by comprising a main body plate (1) and a plurality of triangular prisms (2), wherein the triangular prisms (2) are arranged at the lower end of the main body plate (1) side by side along a first direction, and the lengths of the triangular prisms (2) extend along a second direction; the first direction is parallel to the incident direction of the light source light rays and is perpendicular to the second direction; the triangular prism (2) is provided with a reflecting inclined surface (21) which is obliquely downwards arranged along the first direction, and an acute angle between the reflecting inclined surface (21) and the outgoing surface of the main body plate (1) is 10-20 degrees;

the lower end of the main body plate (1) is provided with a plurality of arc grooves (3) which are arranged at intervals along the second direction, and the arc grooves (3) are gradually narrowed along the first direction.

2. The light guide plate according to claim 1, wherein the triangular prisms (2) further have auxiliary inclined surfaces (22) connected to the reflecting inclined surfaces (21) at an angle, and the auxiliary inclined surfaces (22) of each triangular prism (2) further are connected to the reflecting inclined surfaces (21) of an adjacent one of the triangular prisms (2) at an angle so that a plurality of the triangular prisms (2) form a tooth-like structure.

3. A light guide plate according to claim 2, characterized in that the auxiliary bevel (22) forms an acute angle of 70 ° to 80 ° with the exit face of the body plate (1).

4. A light guide plate according to claim 2, characterized in that the angle between the auxiliary bevel (22) and the reflecting bevel (21) is 70-90 °.

5. A light guide plate according to claim 2, wherein the spacing between adjacent two teeth points in the tooth structure is 30 μm to 70 μm.

6. The light guide plate according to claim 1, wherein the circular arc groove (3) has a large end diameter of 40 μm to 60 μm and a small end diameter of 8 μm to 28 μm.

7. A light guide plate according to claim 6, characterized in that the distance between two adjacent circular arc grooves (3) is 60 μm to 100 μm.

8. A light guide plate according to claim 6, characterized in that the groove depth of the circular arc groove (3) is 5 μm to 15 μm.

9. A backlight module, characterized in that the backlight module comprises a light source and the light guide plate according to any one of claims 1 to 8, wherein the light source is adjacently arranged at one side of a light incident surface (11) of the light guide plate.

10. A display module comprising the backlight module of claim 9.