CN110853502A

CN110853502A - Backlight module and display device

Info

Publication number: CN110853502A
Application number: CN201911199276.6A
Authority: CN
Inventors: 边家快
Original assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-02-28
Anticipated expiration: 2039-11-29
Also published as: CN110853502B

Abstract

The invention discloses a backlight module and a display device, wherein the backlight module comprises a camera shooting area, a light emitting area surrounding the camera shooting area, and a through hole arranged in the camera shooting area, wherein the through hole penetrates through an outer frame, a reflecting sheet, a light guide plate, a first prism sheet and a second prism sheet; the backlight module and the display device adopt the shape of the 'eye button', and are partially arranged in the through hole, and the annular bulge of the shading structure is exposed out of the through hole, so that the repeated glue dispensing process is avoided, and the cost is greatly saved.

Description

Backlight module and display device

Technical Field

The invention relates to the field of display, in particular to a backlight module and a display device.

Background

At present, spaces are often reserved for electronic photosensitive devices such as commonly used front cameras, infrared sensing devices and fingerprint identification devices on the front of display equipment such as mobile phones and tablet computers. For example, the photosensitive devices are arranged at the top position of the front surface of the display device, and the corresponding positions form a non-display area, so that the screen occupation ratio of the device is reduced.

In the prior art, in order to increase the screen ratio, a high-transmittance region may be formed in a display region of a display panel to accommodate the photosensitive device, wherein the high-transmittance region may be a through hole design for digging through the display panel and a backlight unit, or may be a design for digging only a portion of a film layer in the display panel and digging a through hole in the backlight unit, and further, the photosensitive device is placed in the corresponding hole.

At present, the blind hole display screen in the industry all adopts some black hot melt adhesive processes to deal with when avoiding blind hole position light leakage, and this technology needs some hot melt adhesive of point after TPO, and some hot melt adhesive again when TPM, and two hot melt adhesive superposes, play the shading effect.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a backlight module and a display device to solve the problem in the prior art that a plurality of layers of light-shielding adhesives are required to be stacked in order to prevent light leakage at a blind hole of a display panel, which greatly increases the manufacturing cost.

The technical scheme for solving the technical problems is as follows: the invention provides a backlight module, which comprises a camera shooting area, a light emitting area surrounding the camera shooting area, an outer frame, a reflecting sheet arranged in the light emitting area and a light source arranged on the outer frame, wherein the outer frame is provided with a light source hole; the light guide plate is arranged on the reflecting sheet; the first prism sheet is arranged on one side of the light guide plate, which is far away from the reflector plate; the second prism sheet is arranged on one side of the first prism sheet, which is far away from the light guide plate; the through hole is arranged in the camera shooting area and penetrates through the outer frame, the reflecting sheet, the light guide plate, the first prism sheet and the second prism sheet; the shading structure is arranged on one side, close to the second prism sheet, of the through hole, the shading structure extends into the through hole from one side of the second prism sheet, the shading structure comprises a light hole, and the light hole penetrates through the shading structure along the axial direction of the shading structure.

Furthermore, the outer frame comprises a bending part, and the bending part extends from the position, close to the edge of the through hole, of the outer frame to the inner wall of the through hole.

Further, the outer diameter of the shading structure is matched with the inner diameter of the through hole in size.

Furthermore, the shading structure further comprises an annular protrusion arranged on one side of the through hole close to the second prism sheet, and the annular protrusion is exposed out of the through hole.

Further, the material of the light-transmitting structure comprises a hot melt adhesive material.

Further, the outer diameter of the shading structure is smaller than the inner diameter of the through hole.

Furthermore, the shortest distance between the edge of the light-transmitting hole and the edge of the shading structure is 0.05-0.2 mm.

The invention also provides a display device comprising the backlight module.

Furthermore, the light shielding structure includes the light trap, the light trap is followed light shielding structure's radial run through light shielding structure, its characterized in that still includes the camera, locates in the through-hole, wherein the maximum dimension of camera is less than the diameter of light trap.

The polarizer is arranged on one side of the second prism sheet, which is far away from the first prism sheet, wherein an opening is formed in the polarizer corresponding to the through hole; the height of the shading structure exposed out of the through hole is smaller than or equal to the thickness of the polaroid.

The invention has the advantages that: according to the backlight module and the display device, the through hole is formed in the backlight module to accommodate the camera of the display device, the light shading structure is adopted at the through hole to shade the light of the backlight module, the light in the backlight module is prevented from entering the through hole to influence the imaging of the camera, the light shading structure is in a shape of an 'eye ring', the light shading structure is partially arranged in the through hole, the annular bulge of the light shading structure is exposed out of the through hole, the repeated dispensing process is avoided, and the cost is greatly saved.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic view of a backlight module in an embodiment.

Fig. 2 is a top view of the through hole in the embodiment.

Fig. 3 is a schematic view of a part of a display device in an embodiment.

In the drawings

1 a display device; 10 a backlight module;

101 a camera shooting area; 102 a light emitting region;

110 outer frame; 120 a reflector plate;

130 a light guide plate; 140 a first prism sheet;

150 a second prism sheet; 111 a bending part;

1011 through holes; 20 cameras;

160 a light shielding structure; 161 light transmission holes;

162 an annular projection; 30 a polarizer;

Detailed Description

The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. The directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc., refer to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention.

Examples

In this embodiment, the backlight module 10 of the present invention includes a camera area 101 and a light emitting area 102 surrounding the camera area 101.

As shown in fig. 1, the backlight module 10 further includes an outer frame 110, a reflective sheet 120, a light guide plate 130, a first prism sheet 140, and a second prism sheet 150.

The outer frame 110 is disposed in the light emitting region 102, wherein the outer frame 110 includes a bending portion 111, and the bending portion 111 is bent upward from a boundary between the image capturing region 101 and the light emitting region 102 for blocking light.

The reflective sheet 120 is disposed on the outer frame 110 to reflect light irradiated toward the outer frame 110, so as to reduce light loss of the backlight module 10 and improve light emitting efficiency.

The light guide plate 130 is disposed on the reflection sheet 120, the light guide plate 130 is made of acrylic or PC, has a very high reflectivity, does not absorb light, and can convert a linear light source into a surface light source, so that the light emitted by the backlight module 10 is softer.

The first prism sheet 140 and the second prism sheet 150 are disposed on the light guide plate 130, and concentrate the light emitted from the light guide plate 130 into a certain angle range by using the law of reflection and refraction, so as to increase the brightness of the display panel and improve the display quality.

A through hole 1011 is formed in the position of the backlight module 10 corresponding to the image pickup region 101, and the through hole 1011 penetrates through the backlight module 10, and specifically, the through hole 1011 penetrates through the outer frame 110, the reflective sheet 120, the light guide plate 130, the first prism sheet 140, and the second prism sheet 150.

The through hole 1011 is used for installing the camera 20, external light enters the camera 20 through the through hole 1011, and forms a required photo or video after being processed by the processor of the camera 20, and the through hole 1011 is arranged in the backlight module 10, so as to prevent the light source of the backlight module 10 from influencing the lighting of the camera 20 and damaging the display quality of the photo or the video. In this embodiment, a light shielding structure 160 is disposed on a side of the through hole 1011 away from the outer frame 110,

as shown in fig. 2, the light shielding structure 160 includes a cylindrical body, and a light hole 161 is formed in the cylindrical body in the axial direction, in this embodiment, the distance between the light hole 161 and the outer edge of the light shielding structure 160 is 0.05-0.2 mm, which is convenient for processing, and at the same time, ensures the strength of the light shielding structure 160, and prevents the breakage phenomenon caused by too thin wall thickness of the light shielding structure 160 during the use process, and the diameter of the light hole 161 is larger than the outer diameter of the camera 20, so that external light can enter the camera 20 through the light hole 161.

The outer diameter of the light shielding structure 161 is slightly smaller than the inner diameter of the through hole 1011, so that the light shielding structure 161 can extend into the through hole, a part of the sidewall of the light shielding structure 161 abuts against the bending part 111 of the outer frame 110, and the rest of the light shielding structure 161 is exposed out of the through hole 1101, so as to shield the light emitted from the backlight module 10 from entering the through hole 1101, thereby affecting the photographing quality of the camera 20.

Since the outer diameter of the light shielding structure 161 is slightly smaller than the inner diameter of the through hole 1011, the portion of the light shielding structure 161 exposed in the through hole 1101 further includes an annular protrusion 162, and the annular protrusion 162 wraps the body of the light shielding structure 161 exposed out of the through hole 1101 and is overlapped with the second prism sheet 140, so as to prevent the light emitted by the backlight module 10 from entering the camera 20 through the gap between the body of the light shielding structure 161 and the through hole 1011.

As shown in fig. 3, in the embodiment, the display device 1 of the invention includes the backlight module 10, and further includes a polarizer 30, wherein the polarizer 30 is disposed on a side of the second prism sheet 150 away from the first prism sheet 140, and a light hole is disposed on the polarizer 30 corresponding to the image pickup area 101, wherein the light hole is adapted to an outer diameter of the annular protrusion 162, so as to facilitate installation and reduce a thickness thereof, in the embodiment, the thickness of the polarizer 30 is the same as a thickness of the light shielding structure 160 exposed outside the through hole 1011.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A backlight module comprises a camera shooting area and a light emitting area surrounding the camera shooting area, and is characterized by further comprising

The outer frame is arranged in the light emitting area;

the reflector plate is arranged on the outer frame;

the light guide plate is arranged on the reflecting sheet;

the first prism sheet is arranged on one side of the light guide plate, which is far away from the reflector plate;

the second prism sheet is arranged on one side of the first prism sheet, which is far away from the light guide plate;

the through hole is arranged in the camera shooting area and penetrates through the outer frame, the reflecting sheet, the light guide plate, the first prism sheet and the second prism sheet;

the shading structure is arranged on one side, close to the second prism sheet, of the through hole, the shading structure extends into the through hole from one side of the second prism sheet, the shading structure comprises a light hole, and the light hole penetrates through the shading structure along the axial direction of the shading structure.

2. The backlight module according to claim 1,

the frame includes a kink, the kink is from the frame is close to through-hole edge department extends to the through-hole inner wall.

3. The backlight module according to claim 1,

wherein the outer diameter of the shading structure is matched with the inner diameter of the through hole in size.

4. The backlight module according to claim 1,

the shading structure further comprises an annular protrusion arranged on one side, close to the second prism sheet, of the through hole, and the annular protrusion is exposed out of the through hole.

5. The backlight module according to claim 4,

the material of the light-transmitting structure comprises a hot melt adhesive material.

6. The backlight module according to claim 1,

the outer diameter of the shading structure is smaller than the inner diameter of the through hole.

7. The backlight module according to claim 1,

the shortest distance between the edge of the light-transmitting hole and the edge of the shading structure is 0.05-0.2 mm.

8. A display device comprising a backlight module according to any one of claims 1 to 7.

9. The display device of claim 8, wherein the light blocking structure comprises a light hole extending through the light blocking structure in a radial direction of the light blocking structure, and further comprising a camera disposed in the light hole, wherein a maximum dimension of the camera is smaller than a diameter of the light hole.

10. The display device according to claim 8, further comprising

The polaroid is arranged on one side of the second prism sheet, which is far away from the first prism sheet, wherein an opening is formed in the polaroid corresponding to the through hole;

the height of the shading structure exposed out of the through hole is smaller than or equal to the thickness of the polaroid.