WO2018223818A1

WO2018223818A1 - Light guide panel, method of manufacturing light guide panel, backlight module, and display device

Info

Publication number: WO2018223818A1
Application number: PCT/CN2018/086706
Authority: WO
Inventors: 刘彦军; 邓立广; 孟佳; 赵金阁; 柏健
Original assignee: 京东方科技集团股份有限公司; 北京京东方光电科技有限公司
Priority date: 2017-06-08
Filing date: 2018-05-14
Publication date: 2018-12-13
Also published as: CN107167866A

Abstract

Provided are a light guide panel, a method of manufacturing a light guide panel, a backlight module, and a display device. The light guide panel comprises a first base surface portion (2-1) and a second base surface portion (2-2). The first base surface portion (2-1) comprises a dot pattern (3). The second base surface portion (2-2) comprises no dot pattern (3). A distance between the second base surface portion (2-2) and a light source (5) is greater than a distance between the first base surface portion (2-1) and the light source (5). In an embodiment of the present disclosure, a second base surface portion (2-2) containing no dot pattern is used to prevent occurrence of bright stripes without increasing an overlapped amount.

Description

Light guide plate, method for preparing light guide plate, backlight module and display device

The present application claims the priority of the Chinese Patent Application No. 201710425783.1, filed on Jun. 8, s.

Technical field

Embodiments of the present disclosure relate to a light guide plate, a method of fabricating the light guide plate, a backlight module, and a display device.

Background technique

The backlight is a light source located behind the liquid crystal display. In the side-lit backlight structure, a bright line is generally generated on the light-emitting side, and the bright line is generated because the light of the light-emitting side edge of the light guide plate is reflected by the white plastic frame. After being reflected back to the light guide plate, it overlaps with the internal light, causing the light to concentrate, and then scattering through the dots of the light guide plate to the light exit surface of the light guide plate, that is, the amount of light emitted per unit area is increased, resulting in a significant enhancement of the brightness of the local area, giving the human eye It causes a visual bright effect and forms a bright line phenomenon, which affects the quality of the picture display.

In some conventional techniques, in order to avoid the occurrence of bright lines, the size of the light-shielding glue is generally increased, that is, the overlap amount of the light-shielding glue with the film material and the light guide plate is increased to shield the occurrence area of the bright line. When improving the bright line, due to the increased amount of overlap, it is easy to cause the following problems: 1. The narrow frame design requirements of the terminal cannot be met; 2. The effective display area of the terminal is reduced; 3. The light energy is black. The light-shield absorbs and wastes light energy.

Summary of the invention

Embodiments of the present disclosure provide a light guide plate, a method of preparing a light guide plate, a backlight module, and a display device, which can avoid occurrence of a bright line without increasing the amount of overlap.

An embodiment of the present disclosure provides a light guide plate, including: a bottom surface first portion and a bottom surface second portion; wherein the bottom surface first portion includes a mesh point; the bottom surface second portion does not include a mesh point; wherein the bottom surface second portion The distance from the light source is greater than the distance between the first portion of the bottom surface and the light source.

For example, the second portion of the bottom surface includes: a region where the light reflected by the edge of the light guide plate is irradiated on the light guide plate.

For example, the first portion of the bottom surface and the second portion of the bottom surface have an interface; a line of the light shielding glue closer to the boundary distance is a line perpendicular to the second portion of the bottom surface; the boundary to the bottom surface The distance of the second portion of the vertical line is: L = d * tan (arcsin (x / n)); wherein d is the thickness of the light guide plate, n is the refractive index of the light guide plate, and x is the refraction of air rate.

In another aspect, an embodiment of the present disclosure further provides a method for preparing a light guide plate, comprising: determining a bottom surface first portion and a bottom surface second portion of the light guide plate; and molding a mesh point on the bottom portion of the bottom surface of the light guide plate; wherein the bottom surface is second The portion does not inject the dot; the second portion of the bottom surface is spaced from the light source by a distance greater than the distance between the first portion of the bottom surface and the light source.

The embodiment of the present disclosure further provides a backlight module including the above-mentioned light guide plate.

For example, the backlight assembly further includes: a reflective sheet, a film material, and a light shielding glue.

Embodiments of the present disclosure also provide a display device including the backlight assembly described above.

An embodiment of the present disclosure includes: a light guide plate including a bottom surface first portion and a bottom surface second portion; wherein the bottom surface first portion includes a mesh point; the bottom surface second portion does not include a mesh point; and the second portion of the bottom surface is separated from the light source by a distance greater than a distance between the first portion of the bottom surface and the light source . Embodiments of the present disclosure avoid the occurrence of bright lines without increasing the amount of overlap by including the second portion of the bottom surface of the dots.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. It is obvious that the drawings in the following description relate only to some embodiments of the present disclosure, and are not to limit the disclosure. .

1 is a structural block diagram of a backlight assembly;

2 is a structural block diagram of a light guide plate according to an embodiment of the present disclosure;

3 is a flow chart of a method of preparing a light guide plate according to an embodiment of the present disclosure;

4 is a structural block diagram of a backlight module according to an embodiment of the present disclosure.

detailed description

The technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. It is apparent that the described embodiments are part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present disclosure without departing from the scope of the invention are within the scope of the disclosure.

The steps illustrated in the flowchart of the figures may be executed in a computer system such as a set of computer executable instructions. Also, although logical sequences are shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than the ones described herein.

1 is a structural block diagram of a backlight assembly. As shown in FIG. 1 , the inventors have found that in the side-lit backlight assembly structure, the bottom surface 2 of the light guide plate 1 is completely covered with the dots 3 and the light-emitting side edge of the light guide plate 1 The light is reflected by the white plastic frame 4, and is reflected back to the light guide plate 1 to overlap with the internal light, causing the light to concentrate, and then scattered through the mesh point 3 of the light guide plate to the light exit surface of the light guide plate 1, thereby causing the brightness of the local area to be significantly strengthened. It creates a visually bright effect on the human eye and forms a bright line phenomenon.

2 is a structural block diagram of a light guide plate according to an embodiment of the present disclosure. As shown in FIG. 2, the method includes: a bottom surface first portion 2-1 and a bottom surface second portion 2-2;

The first part of the bottom surface comprises a dot 3;

The second part of the bottom surface does not contain dots;

The distance between the second portion 2-2 of the bottom surface and the light source 5 is greater than the distance between the first portion 2-1 of the bottom surface and the light source 5.

For example, the second portion 2-2 of the bottom surface of the embodiment of the present disclosure includes a region where light reflected from the edge of the light guide plate is irradiated on the light guide plate.

For example, in the embodiment of the present disclosure, the bottom surface first portion 2-1 and the bottom surface second portion 2-2 have a boundary 2-3;

a line perpendicular to the second portion 2-2 of the bottom surface is formed along an end point of the light shielding glue which is closer to the boundary 2-3;

The distance between junction 2-3 and the line perpendicular to the second portion of the bottom surface is:

L=d*tan(arcsin(x/n));

Where d is the thickness of the light guide plate, n is the refractive index of the light guide plate, and x is the refractive index of air.

3 is a flow chart of a method for preparing a light guide plate according to an embodiment of the present disclosure. As shown in FIG. 3, the method includes:

Step 300, determining a first portion of the bottom surface of the light guide plate and a second portion of the bottom surface;

Step 301: injection molding a dot on the first portion of the bottom surface of the light guide plate;

Wherein, the second portion of the bottom surface does not inject the mesh point; the distance between the second portion of the bottom surface and the light source is greater than the distance between the first portion of the bottom surface and the light source.

For example, the second portion of the bottom surface of the embodiment of the present disclosure includes a region where light reflected from the edge of the light guide plate is irradiated on the light guide plate.

For example, in the embodiment of the present disclosure, the first portion of the bottom surface and the second portion of the bottom surface have a boundary;

a line perpendicular to the second portion of the bottom surface along an end point of the light-shielding glue that is closer to the boundary;

The distance from the boundary to the line perpendicular to the second portion of the bottom surface is:

L=d*tan(arcsin(x/n));

An embodiment of the present disclosure includes: a light guide plate including a bottom surface first portion and a bottom surface second portion; wherein the bottom surface first portion includes a mesh point; the bottom surface second portion does not include a mesh point; and the bottom surface second portion is separated from the light source by a distance greater than the first portion of the bottom surface and the light source distance. Embodiments of the present disclosure avoid the occurrence of bright lines without increasing the amount of overlap by including the second portion of the bottom surface of the dots.

4 is a structural block diagram of a backlight module according to an embodiment of the present disclosure, as shown in FIG. 4, including a light guide plate; the light guide plate 1 includes:

a bottom surface first portion 2-1 and a bottom surface second portion 2-2; wherein

The first part of the bottom surface comprises a dot 3;

The second part of the bottom surface does not contain dots;

L=d*tan(arcsin(x/n));

For example, the backlight assembly of the embodiment of the present disclosure further includes: a reflective sheet 7, a film 8, and a light shielding glue 6.

The embodiment of the present disclosure further provides a display device including a backlight assembly; the backlight module includes a light guide plate; the light guide plate includes: a first portion of the bottom surface and a second portion of the bottom surface; wherein

The first part of the bottom surface contains the dots;

The second part of the bottom surface does not contain dots;

The distance between the second portion of the bottom surface and the light source is greater than the distance between the first portion of the bottom surface and the light source.

L=d*tan(arcsin(x/n));

For example, the backlight assembly in the display device of the embodiment of the present disclosure further includes: a reflective sheet, a film material, and a light shielding glue.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct related hardware, such as a processor, which may be stored in a computer readable storage medium, such as a read only memory, disk or optical disk. Wait. For example, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, being executed by a processor and stored in a memory. Programs/instructions to implement their respective functions. The present disclosure is not limited to any specific form of combination of hardware and software.

The above description is only an exemplary embodiment of the present disclosure, and is not intended to limit the scope of the disclosure. The scope of the disclosure is determined by the appended claims.

Claims

a light guide plate comprising: a first portion of a bottom surface and a second portion of a bottom surface; wherein

The first portion of the bottom surface includes a mesh point;

The second portion of the bottom surface does not include a mesh point;

The distance between the second portion of the bottom surface and the light source is greater than the distance between the first portion of the bottom surface and the light source.
The light guide plate according to claim 1, wherein

The second portion of the bottom surface includes: a region where the light reflected by the edge of the light guide plate is irradiated on the light guide plate.
The light guide plate according to claim 1 or 2, wherein

a boundary between the first portion of the bottom surface and the second portion of the bottom surface;

a line perpendicular to the second portion of the bottom surface along an end point of the light-shielding glue that is closer to the boundary;

The distance from the boundary to the line perpendicular to the second portion of the bottom surface is:

L=d*tan(arcsin(x/n));

Where d is the thickness of the light guide plate, n is the refractive index of the light guide plate, and x is the refractive index of air.
A method of preparing a light guide plate, comprising:

Determining a first portion of the bottom surface of the light guide plate and a second portion of the bottom surface;

Injecting a dot on the first portion of the bottom surface of the light guide plate;

Wherein the second portion of the bottom surface does not inject a dot; the second portion of the bottom surface is spaced from the light source by a distance greater than a distance between the first portion of the bottom surface and the light source.
The method of claim 4, wherein

The second portion of the bottom surface includes: a region where the light reflected by the edge of the light guide plate is irradiated on the light guide plate.
The method according to claim 4 or 5, wherein

a boundary between the first portion of the bottom surface and the second portion of the bottom surface;

a line perpendicular to the second portion of the bottom surface along an end point of the light-shielding glue that is closer to the boundary;

The distance from the boundary to the line perpendicular to the second portion of the bottom surface is:

L=d*tan(arcsin(x/n));

Where d is the thickness of the light guide plate, n is the refractive index of the light guide plate, and x is the refractive index of air.
A backlight module comprising the light guide plate according to any one of claims 1 to 3.
The backlight module of claim 7, further comprising:

Reflective sheet, film, light-shield.
A display device comprising the backlight module of claim 7.
A display device comprising the backlight module of claim 8.