CN210488032U

CN210488032U - Light guide plate, backlight module and display

Info

Publication number: CN210488032U
Application number: CN201921825624.1U
Authority: CN
Inventors: 吴宗泽; 佘贵慧; 吕阳平; 赖炯宪; 黄婕妤; 李俊贤; 李晏昌
Original assignee: Radiant Opto Electronics Suzhou Co Ltd
Current assignee: Radiant Opto Electronics Suzhou Co Ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-05-08
Anticipated expiration: 2029-10-28

Abstract

The utility model relates to a light guide plate, backlight unit and display. The light guide plate is used for being matched with the light emitting source to convert the light emitted by the light emitting source into plane light, and comprises a body and a reflecting part, wherein the side surface of the body is defined as a light incident surface, the top surface of the body is defined as a light emitting surface, a total reflecting surface with a total reflecting effect is formed on the reflecting part, and the total reflecting surface is connected with the light incident surface and the light emitting surface, wherein the thickness of the body is greater than the height of the light emitting source in the thickness direction of the body, so that the light guide plate can reduce energy loss and improve the light emitting efficiency.

Description

Light guide plate, backlight module and display

Technical Field

The present invention relates to a light guide plate, and more particularly to a light guide plate capable of providing a total reflection effect to a part of light to improve the light utilization rate of a light source.

Background

The backlight module of the existing liquid crystal display mainly comprises a light guide plate and a light-emitting source arranged on one side of a light incident surface of the light guide plate, wherein the light-emitting source is provided with a plurality of luminous bodies which can be light-emitting diodes (LEDs). By means of the light guide plate, the light emitted by the luminous bodies of the luminous sources can be uniformly dispersed in the whole light guide plate, so that a backlight source for displaying pictures can be provided for the liquid crystal panel.

However, since the light of each illuminant is emitted radially outwards when emitting light, a part of the light (especially the light emitted by the LED with larger power) will not enter the light guide plate, and in order to avoid the heat generated when the LED emits light from affecting the light guide plate and even melting the light guide plate, a space is formed between the illuminant and the light guide plate, but the energy of the illuminant entering the light guide plate is reduced, and the light emitting efficiency of the whole backlight module is further affected.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model discloses the people is in view of current light guide plate structure and not enough and the disappearance of use, through continuous experiment and research, develops a can improve current disappearance the utility model discloses eventually.

The main object of the present invention is to provide a light guide plate, wherein the light incident surface of the light guide plate is formed with a total reflection surface having a total reflection effect, so that the light of a part of the light emitting body can be reflected by the total reflection surface to enter the light guide plate, thereby avoiding the energy loss of the light emitting body, and achieving the purpose of improving the utilization efficiency of the light emitting source energy.

In order to achieve the above object, the present invention provides a light guide plate for cooperating with a light source to convert the light emitted from the light source into a planar light, the light guide plate comprising: the light source comprises a body, a light source and a light guide plate, wherein the side surface of the body is defined as a light incident surface, and the top surface of the body is defined as a light emergent surface; and a reflection part, wherein a total reflection surface with total reflection effect is formed on the reflection part, and the total reflection surface is connected with the light incident surface and the light emergent surface, and the thickness of the body is larger than the height of the light emitting source in the thickness direction of the body.

By the technical means, the utility model discloses can borrow by the total reflection face on the reflection part will originally can be because of the body and the luminous body between the clearance and a part light reflection that scatters and disappears and get into in the body so that recycle, reduce the loss of light emitting source energy from this, and then improve holistic luminous efficacy.

Drawings

Fig. 1 is a partial perspective external view of a light guide plate according to a first embodiment of the present invention.

Fig. 2 is a perspective view of a backlight module according to the present invention.

Fig. 3 is a partial view of a backlight module according to the present invention.

Fig. 4 is a schematic cross-sectional view of the backlight module taken along the line a-a in fig. 2 according to the present invention.

Fig. 5 is a schematic side view of a display according to the invention.

Fig. 6 is an enlarged partial perspective view of a light guide plate according to a second embodiment of the present invention.

Fig. 7 is a side sectional view of a light guide plate according to a third embodiment of the present invention.

Detailed Description

The utility model provides a light guide plate, backlight unit and display. Referring to fig. 1 to 3, the light guide plate of the present invention is used in cooperation with a light source to convert light emitted from the light source into planar light, thereby forming a backlight module. The light emitting source has a plurality of luminous bodies 30. The light guide plate includes a body 10 and a reflection portion 20, wherein a side surface of the body 10 is defined as a light incident surface 12, and a top surface of the body 10 is defined as a light emitting surface 14. The reflection portion 20 has a total reflection surface 22 with total reflection effect, and the total reflection surface 22 connects the light incident surface 12 and the light emitting surface 14. Wherein, in the thickness direction of the body 10, the thickness of the body 10 is greater than the height of the light-emitting source. In addition, the reflection part 20 may be protruded from the body 10 in a single bar shape as shown in the figure. Or, the reflection portion 20 can be protruded on the main body 10 in a multi-stage manner, and respectively correspond to the light emitting bodies 30 of the light emitting sources. As shown in fig. 5, a display panel 40 is disposed on one side of the light emitting surface 14 of the light guide plate, thereby forming a display.

The total reflection surface 22 is a surface having a curvature. Preferably, the total reflection surface 22 is a surface with a variable curvature, so that the curvature at each position can be precisely controlled, and the light at each position can be totally reflected, thereby ensuring that the light can be reflected and enter the body 10. In addition, as shown in fig. 6, which shows the light guide plate according to the second embodiment of the present invention, the total reflection surface 22A may be formed by a plurality of continuous facets, so that convenience when the mold of the body 10 is opened may be improved, and thus the overall production cost may be reduced. Moreover, in the thickness direction of the body 10, the body 10 has a first centerline L1, each light emitter has a second centerline L2, and the first centerline L1 is closer to the total reflection surface 22 than the second centerline L2. Therefore, the position of the light emitter 30 is lower than the central position of the body 10, so the reflecting portion 20 is far away from the light emitter 30, thereby covering the light emitting angle of the light emitter 30, so that the light emitted by the light emitter 30 can be effectively reflected by the reflecting portion and enter the body 10.

Therefore, referring to fig. 4, when the light emitter 30 of the light source emits light, a portion of the light enters the main body 10 of the light guide plate through the light incident surface 12 and is uniformly dispersed on the whole main body 10 by the conduction of the light guide plate. Since the thickness of the main body 10 is greater than the height of the light source, the light source is covered by the main body 10, so that the light emitted from the light source can enter the main body 10. However, since there is still a gap between the main body 10 and the light source, a part of the light that would otherwise be lost due to the gap between the main body 10 and the light emitter 30 enters the reflection portion 20 and is reflected by the total reflection surface 22 of the reflection portion 20 to enter the main body 10 for recycling, so that the loss of the energy of the light source can be reduced, thereby improving the overall light emitting efficiency.

Referring to fig. 7, a light guide plate according to a third embodiment of the present invention is shown, wherein the light incident surface 12A of the light guide plate body 10A is a concave arc surface. Therefore, when the light emitted by the light emitting element 30 enters the main body 10A of the light guide plate, compared with the planar light incident surface 12 of the first embodiment shown in fig. 1, the concave arc light incident surface 12A can make the refraction angle of the light larger, so that the emergent light emitted out of the main body 10A in the up-down direction or the left-right direction can be more spread, and thus can be more uniformly distributed on the whole main body 10A.

By means of the arrangement that the light incident surface 12A of the light guide plate body 10 is a concave arc surface, the light incident angle of the light emitted by the light emitting body 30 entering the light guide plate body 10A can be increased, thereby improving the problems of dark bands and uneven brightness of the light guide plate, and improving the overall luminous efficiency of the backlight module.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereto, that is, the scope of the claims and the description of the present invention are only the same as the scope of the simple equivalent changes and modifications, and still fall within the scope covered by the patent of the present invention.

[ List of reference numerals ]

10.

10A body

12, 12A light incident surface

14 reflection part of light emitting surface 20

22. 22A Total reflection surface 30 emitter

40 display panel L1 first center line

L2 second centerline.

Claims

1. A light guide plate for use with a light source to convert light emitted from the light source into planar light, the light guide plate comprising:

the light source comprises a body, a light source and a light source, wherein the side surface of the body is defined as a light inlet surface, and the top surface of the body is defined as a light outlet surface; and

the reflecting part is provided with a total reflection surface with a total reflection effect, and the total reflection surface is connected with the light incident surface and the light emergent surface;

wherein, in the thickness direction of the body, the thickness of the body is larger than the height of the luminous source.

2. The light guide plate according to claim 1, wherein the total reflection surface is a surface having a curvature.

3. The light guide plate according to claim 2, wherein the total reflection surface is a surface having a varying curvature.

4. The light guide plate according to claim 1, wherein the total reflection surface is composed of a plurality of continuous facets.

5. The light guide plate according to claim 1, wherein the light incident surface of the body of the light guide plate is a concave arc surface.

6. A backlight module, comprising:

the light guide plate according to any one of claims 1 to 5; and

a light emitting source disposed at one side of the light incident surface of the body and including a plurality of light emitters,

wherein, in the thickness direction of the body, the thickness of the body is greater than the height of the luminous body.

7. The backlight module as claimed in claim 6, wherein the body has a first central line in a thickness direction of the body, each of the light emitters has a second central line, and the first central line is closer to the total reflection surface than the second central line.

8. A display, comprising:

a backlight module according to claim 6 or 7; and

and the display panel is arranged on one side of the light emergent surface of the light guide plate.