WO2020082479A1

WO2020082479A1 - Backlight module and display device thereof

Info

Publication number: WO2020082479A1
Application number: PCT/CN2018/116857
Authority: WO
Inventors: 景小红
Original assignee: 惠州市华星光电技术有限公司
Priority date: 2018-10-23
Filing date: 2018-11-22
Publication date: 2020-04-30
Also published as: CN109521600A

Abstract

Provided are a backlight module and a display device thereof. The backlight module comprises: a rubber frame (301) internally provided with a groove, the bottom of the groove being a plane, and inclined sidewalls being provided on both sides; a light-reflecting plate (306) provided on a bottom plane of the rubber frame (301); a light source (307) provided on the light-reflecting plate (306); a diffusion plate (303) provided on the rubber frame (301); and a brightness compensation structure provided between the rubber frame (301) and the diffusion plate (303). By providing the brightness compensation structure between the rubber frame (301) and the diffusion plate (303), under the premise that a supporting structure design of an optical component, such as an internal diffusing plate (303), of an ultra-narrow frame backlight module is satisfied, the brightness of an edge dark area is compensated; the display effect is improved; and the display quality requirement of the module is satisfied.

Description

Backlight module and display device

Technical field

The present application relates to the field of liquid crystal display, in particular to a backlight module and its display device.

Background technique

The backlight is one of the key components of the LCD flat panel display. Compared with the traditional cold cathode fluorescent lamp backlight, the LCD flat TV with LED as the backlight has a wide color gamut range, good color reproduction, and a large brightness range adjustment , Long service life and other advantages. LED liquid crystal flat panel displays are divided into direct type and side light type according to the different positions of the light source. The direct-type backlight directly places the LED light source under the light-emitting surface, and the light emitted by the light source is diffused and mixed by the diffusion plate to be emitted as a surface light source.

technical problem

The structure design of the traditional direct type module is shown in FIG. 1. The light source 104 is disposed in the plastic frame 101. The light emitted by the light source 104 is diffused and mixed by the diffusion plate 102 and emitted as a surface light source, and passes through the optical diaphragm 103. Finally reach the display panel. On the premise that the frame 106 is large enough, the length of the light emitting area of the backlight module should be equal to or greater than the length of the effective display area 105 of the display panel.

When the length of the frame becomes smaller, as shown in FIG. 2, the length of the frame 207 becomes smaller. Due to the structural design limitation of the backlight module, the light emitted by the light source 204 is diffused by the light mixing cavity 201 and diffused before passing through the optical film 203 The part contacted by the board 202 is blocked, and the part where the light mixing cavity 201 contacts the diffusion plate 202 is a blind light area 209. The blind light area 209 causes the effective display area 205 of the display panel to be longer than the length of the light emitting area 208 of the backlight module. This will cause dark areas 206 on the edge of the display panel border, which will affect the display quality of the module.

Therefore, the existing backlight module has the problems of dark areas on the border of the frame and poor display quality of the module. Therefore, it is necessary to provide a backlight module to improve this defect.

Technical solution

The present application provides a backlight module and a display device thereof, which are used to solve the problems in the prior art that there are dark areas on the edges of the frame and poor display quality.

A backlight module provided by the present application. The backlight module includes:

A plastic frame, a groove is provided inside the plastic frame, the bottom of the groove is a plane, and inclined side walls are provided on both sides;

Reflective plate, set on the bottom plane of the plastic frame;

A light source, which is arranged on the reflective board;

A diffusion plate, arranged on the plastic frame;

The brightness compensation structure is provided in the blind area between the plastic frame and the diffusion plate.

In the backlight module provided by the embodiment of the present application, the brightness compensation structure includes a light guide plate disposed between the plastic frame and the diffusion plate.

In the backlight module provided by the embodiment of the present application, a reflective strip is provided at the bottom of the light guide plate.

In the backlight module provided by the embodiment of the present application, the light guide plate is an edge-type light guide plate.

In the backlight module provided by the embodiment of the present application, a dot microstructure is provided at the bottom of the light guide plate.

In the backlight module provided by the embodiment of the present application, a V-groove microstructure is provided at the bottom of the light guide plate

In the backlight module provided by the embodiment of the present application, convex portions are provided on the top of both sides of the plastic frame, and the convex portions are used to prevent the brightness compensation structure from shifting to both sides under the action of external force.

In the backlight module provided by the embodiment of the present application, the length of the light emitting area of the backlight module is not less than the length of the effective display area of the display panel.

In the backlight module provided by the embodiment of the present application, a reflective layer is provided on the inclined side wall.

The present application provides a display device including:

Display panel

Backlight module, the backlight module includes:

Reflective plate, set on the bottom plane of the plastic frame;

A light source, which is arranged on the reflective board;

A diffusion plate, arranged on the plastic frame;

In the display device provided by the embodiment of the present application, the brightness compensation structure includes a light guide plate disposed between the plastic frame and the diffusion plate.

In the display device provided by the embodiment of the present application, a reflective bar is provided at the bottom of the light guide plate.

In the display device provided by the embodiment of the present application, the light guide plate is an edge-type light guide plate.

In the display device provided by the embodiment of the present application, a dot microstructure is provided at the bottom of the light guide plate.

In the display device provided by the embodiment of the present application, a V-groove microstructure is provided at the bottom of the light guide plate

In the display device provided by the embodiment of the present application, convex portions are provided on the top of both sides of the plastic frame, and the convex portions are used to prevent the brightness compensation structure from shifting to both sides under the action of external force.

In the display device provided by the embodiment of the present application, the length of the light emitting area of the backlight module is not less than the length of the effective display area of the display panel.

In the display device provided by the embodiment of the present application, a reflective layer is provided on the inclined sidewall.

Beneficial effect

Beneficial effect of the present application: In the present invention, by providing a brightness compensation structure between the plastic frame and the diffusion plate, on the premise of satisfying the design of the support structure of the diffusion plate and other optical components inside the ultra-narrow bezel backlight module, the brightness of the dark edge area is compensated and improved The display effect meets the display quality requirements of the module.

BRIEF DESCRIPTION

In order to more clearly explain the embodiments or the technical solutions in the prior art, the following will briefly introduce the drawings used in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only inventions. For some embodiments, those of ordinary skill in the art can obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a backlight module in the prior art;

2 is another schematic structural diagram of a backlight module in the prior art;

3 is a schematic structural diagram of a backlight module provided by this application.

Embodiments of the invention

The descriptions of the following embodiments refer to additional drawings to illustrate specific embodiments that can be implemented in the present application. Directional terms mentioned in this application, such as [upper], [lower], [front], [back], [left], [right], [inner], [outer], [side], etc., are for reference only Attach the direction of the schema. Therefore, the directional language used is to illustrate and understand this application, not to limit this application. In the figure, units with similar structures are indicated by the same reference numerals.

The present invention will be further described below with reference to the drawings and specific embodiments:

In this embodiment, a backlight module is provided. The backlight module will be described in detail below with reference to FIG. 3.

The backlight module provided in this embodiment includes: a plastic frame 301, a light guide plate 302, a reflective strip 305, a diffusion plate 303, an optical film 304, a reflective plate 306, and a light source 307.

A groove is provided inside the plastic frame 301, the bottom of the groove is a plane, a reflective plate 306 is provided on the bottom plane of the plastic frame 301, a light source 307 is provided on the reflective plate 306; a diffusion plate 303 is provided on the top of the plastic frame 301, It is located directly above the light source 307; both sides of the groove inside the plastic frame 301 are provided with inclined side walls, and a reflective layer is provided on the inclined side walls to reflect the light emitted from the light source 307 onto the inclined side walls.

The light guide plate 302 and the reflective strip 305 form a brightness compensation structure. The light guide plate 302 is disposed in the blind light area 312 between the plastic frame 301 and the diffusion plate 303. The reflective strip 305 is attached to the bottom of the light guide plate 302; A convex structure with a rectangular cross section is provided, and the protrusion is used to prevent the light guide plate 302 from shifting to both sides under the action of an external force.

In this embodiment, the light guide plate 302 may be a strip-shaped side-entry light guide plate. As shown in FIG. 3, the light emitted by the light source 307 provided at the bottom of the plastic frame 301 enters the light guide plate 302 from the side, and the scattering effect of the light guide plate 302 destroys the total reflection of the light, so that the light entering from the side is evenly The front surface of the light guide plate is emitted, thereby improving the edge dark area defect existing in the prior art.

In this embodiment, in order to obtain a better reflection effect, the bottom of the light guide plate 302 is provided with a microstructure (not shown in the figure), which can diffuse the light that originally propagated in the light guide plate in the form of total reflection to the front.

In some embodiments, in order to obtain a better reflection effect, the microstructure may be a diffused dot microstructure. The dots are unevenly distributed at the bottom of the light guide plate. When the light hits the diffused dots, due to the small structure contained in the dots, the direction of light propagation changes and scattering occurs.

In some embodiments, the microstructure may also be a V-groove microstructure. The microstructure is provided at the bottom of the light guide plate. The two slopes of the groove are not transparent due to special processing, and only function as reflected light. The linear light source emitted from the light source 307 is converted into a surface light source by using light effects such as refraction, reflection, and diffuse reflection formed by the side light source between the network lines. In this embodiment, due to the limitation of the structural design of the backlight module, the frame 308 of the display panel 309 can be matched with the specific structural design on the premise of satisfying the supporting and fixing functions of the optical elements such as the diffusion plate 303 and the brightness compensation structure. In order to avoid dark areas, the length 311 of the light emitting area of the backlight module should be equal to the length of the effective display area 310 of the display panel 309.

In some embodiments, in order to avoid dark areas, the length 311 of the light emitting area of the backlight module may also be greater than the length of the effective display area 310 of the display panel.

The present application further discloses a display device, as shown in FIG. 3, which includes a display panel 309 and the backlight module described in the above embodiment.

The backlight module includes: a plastic frame 301, a light guide plate 302, a reflective strip 305, a diffusion plate 303, an optical film 304, a reflective plate 306, and a light source 307. A groove is provided inside the plastic frame 301, the bottom of the groove is a plane, a reflective plate 306 is provided on the bottom plane of the plastic frame 301, a light source 307 is provided on the reflective plate 306; a diffusion plate 303 is provided on the top of the plastic frame 301, It is located directly above the light source 307; both sides of the groove inside the plastic frame 301 are provided with inclined side walls, and a reflective layer is provided on the inclined side walls to reflect the light emitted from the light source 307 onto the inclined side walls.

The display device may be a TFT-LCD liquid crystal module, or may be another type of liquid crystal display device, which is not restricted too much here.

In this embodiment, the light guide plate 302 may be a strip-shaped side-entry light guide plate. As shown in FIG. 3, the light emitted by the light source 307 provided at the bottom of the plastic frame 301 enters the light guide plate 302 from the side, and the scattering effect of the light guide plate 302 destroys the total reflection of the light, so that the light entering from the side is uniform The front surface of the light guide plate is emitted, thereby improving the edge dark area defect existing in the prior art.

The invention compensates the brightness of the dark area of the edge, improves the display effect, and satisfies the module by providing a brightness compensation structure between the plastic frame and the diffusion plate, on the premise of satisfying the design of the support structure of the optical plate and other optical components inside the ultra-narrow bezel backlight module Display quality requirements.

In summary, although the present application is disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application. Those of ordinary skill in the art can make various kinds without departing from the spirit and scope of the present application Changes and retouching, so the scope of protection of this application is based on the scope defined by the claims.

Claims

A backlight module, wherein the backlight module includes:

A plastic frame, a groove is provided inside the plastic frame, the bottom of the groove is a plane, and inclined side walls are provided on both sides;

Reflective plate, set on the bottom plane of the plastic frame;

A light source, which is arranged on the reflective board;

A diffusion plate, arranged on the plastic frame;

The brightness compensation structure is provided in the blind area between the plastic frame and the diffusion plate.
The backlight module of claim 1, wherein the brightness compensation structure comprises a light guide plate disposed between the plastic frame and the diffusion plate.
The backlight module according to claim 2, wherein a reflective strip is provided at the bottom of the light guide plate.
The backlight module according to claim 2, wherein the light guide plate is an edge-type light guide plate.
The backlight module according to claim 2, wherein a dot microstructure is provided at the bottom of the light guide plate.
The backlight module of claim 2, wherein a V-groove microstructure is provided at the bottom of the light guide plate
The backlight module of claim 1, wherein the top of both sides of the plastic frame is provided with raised portions, and the raised portions are used to prevent the brightness compensation structure from shifting to both sides under the action of external force.
The backlight module of claim 1, wherein the length of the light emitting area of the backlight module is not less than the length of the effective display area of the display panel.
The backlight module of claim 1, wherein a reflective layer is provided on the inclined sidewall.
A display device, wherein the display device includes:

Display panel

Backlight module, including:

A plastic frame, a groove is provided inside the plastic frame, the bottom of the groove is a plane, and inclined side walls are provided on both sides;

Reflective plate, set on the bottom plane of the plastic frame;

A light source, which is arranged on the reflective board;

A diffusion plate, arranged on the plastic frame;

The brightness compensation structure is provided in the blind area between the plastic frame and the diffusion plate.
The display device of claim 10, wherein the brightness compensation structure includes a light guide plate disposed between the plastic frame and the diffusion plate.
The display device according to claim 11, wherein a reflective strip is provided at the bottom of the light guide plate.
The display device according to claim 11, wherein the light guide plate is an edge-type light guide plate.
The display device according to claim 11, wherein a dot microstructure is provided at the bottom of the light guide plate.
The display device of claim 11, wherein a V-groove microstructure is provided at the bottom of the light guide plate
The display device according to claim 10, wherein the tops of both sides of the plastic frame are provided with protrusions, and the protrusions are used to prevent the brightness compensation structure from shifting to both sides under the action of external force.
The display device of claim 10, wherein the length of the light emitting area of the backlight module is not less than the length of the effective display area of the display panel.
The display device according to claim 10, wherein a reflective layer is provided on the inclined side wall.