WO2024131420A1

WO2024131420A1 - Backlight module and display module

Info

Publication number: WO2024131420A1
Application number: PCT/CN2023/132966
Authority: WO
Inventors: 章泽; 朱磊
Original assignee: 武汉华星光电技术有限公司
Priority date: 2022-12-20
Filing date: 2023-11-21
Publication date: 2024-06-27
Also published as: CN115826296A

Abstract

A backlight module (100). The backlight module (100) comprises a housing (10) provided with a mounting face (111); a lamp panel (20) provided on the mounting face (111); an optical film layer (30) provided on the lamp panel (20); and a frame (40) provided on the mounting face (111), wherein the lamp panel (20) is provided with an LED device (22); the optical film layer (30) covers the LED device (22); a side wall face of the optical film layer (30) protrudes from a side surface of the lamp panel (20); the surface of the optical film layer (30) facing the mounting face (111), the side surface of the lamp panel (20) and the mounting face (111) define an accommodating space (20a); and the frame (40) comprises a light blocking part (41) located in the accommodating space (20a).

Description

Backlight module, display module

Technical Field

The present application belongs to the field of display technology, and specifically relates to a backlight module and a display module.

Background technique

With the rapid development of display technology, liquid crystal display technology has been widely used in the display field. The liquid crystal display panel itself cannot emit light, and a backlight module is required to provide the brightness required for its display. Sub-millimeter light emitting diodes (Mini-Light Emitting Diode, Mini-LED) as backlights have become a research hotspot in the current display technology field. Mini-LED has the characteristics of good display performance, low power and high brightness. In the process of research and practice of the prior art, the inventors of the present application found that the large-angle light at the edge of the existing Mini-LED backlight module is directly emitted without passing through the optical film layer, so that the light-emitting effect of the edge area is different from the light-emitting effect of the in-plane area, and then the problem of poor optics is caused by light leakage from the edge. Therefore, it is necessary to develop a backlight module and a display module to overcome the defects of the prior art.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide a backlight module and a display module, which can improve the optical defects of the edge bright lines of the backlight module.

In order to solve the above technical problems, the present application provides a backlight module, comprising:

A housing, wherein the housing is provided with a mounting surface;

A light board, the light board is arranged on the mounting surface of the housing, and the light board is provided with an LED device;

an optical film layer, the optical film layer being disposed on the lamp board and covering the LED device, and the side wall surface of the optical film layer protruding from the side surface of the lamp board, and the surface of the optical film layer facing the mounting surface, the side surface of the lamp board and the mounting surface defining an accommodating space; and

A frame is arranged on the installation surface of the shell, and the frame includes a light blocking portion, and the light blocking portion is located in the accommodating space.

The present application also provides a display module, including a backlight module. The backlight module includes:

A housing, wherein the housing is provided with a mounting surface;

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a backlight module provided in one embodiment of the present application;

FIG. 2 is a schematic structural diagram of a backlight module provided in yet another embodiment of the present application.

Embodiments of the present invention

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

The present application provides a backlight module, comprising:

A housing, wherein the housing is provided with a mounting surface;

In the backlight module provided in an embodiment of the present application, the light blocking portion forms a reflective surface on a side facing the light board.

In the backlight module provided in an embodiment of the present application, a reflective sheet is attached to a side of the light blocking portion facing the light board.

In the backlight module provided in an embodiment of the present application, the reflective surface is spaced apart from the side surface of the light board.

In the backlight module provided in an embodiment of the present application, the spacing distance between the reflective surface and the side surface of the light board gradually increases along the direction from the light board toward the optical film layer.

In the backlight module provided in an embodiment of the present application, the frame includes a frame portion, and the frame portion is arranged on a side of the light blocking portion away from the light board.

A side of the frame portion facing away from the mounting surface is flush with a side of the optical film layer facing away from the light board.

A side of the frame portion facing away from the mounting surface is higher than a side of the optical film layer facing away from the light board.

In the backlight module provided in one embodiment of the present application, the light blocking portion and the frame portion are integrally arranged.

In the backlight module provided in an embodiment of the present application, the light blocking portion and the frame portion are arranged at an interval.

In the backlight module provided in one embodiment of the present application, the backlight module further includes a light shielding layer, which is disposed on the frame portion and extends above a partial area of a side of the optical film layer away from the light board.

In the backlight module provided in one embodiment of the present application, the optical film layer includes a filter layer and a light conversion layer, the filter layer is arranged on the light board, the light conversion layer is stacked on the filter layer, and the LED device is a blue light LED device.

A housing, wherein the housing is provided with a mounting surface;

In the display module provided in one embodiment of the present application, the light blocking portion forms a reflective surface on a side facing the light board.

In the display module provided in one embodiment of the present application, a reflective sheet is attached to a side of the light blocking portion facing the light board.

In the display module provided in an embodiment of the present application, the reflective surface is spaced apart from the side surface of the light board.

In the display module provided in an embodiment of the present application, the spacing distance between the reflective surface and the side surface of the light board gradually increases along the direction from the light board toward the optical film layer.

In the display module provided in an embodiment of the present application, the frame includes a frame portion, and the frame portion is arranged on a side of the light blocking portion away from the light board.

The embodiment of the present application adopts a backlight module and a display module. The backlight module includes a housing, a lamp board, an optical film layer and a frame. The housing is provided with a mounting surface, the lamp board is provided on the mounting surface of the housing, and an LED device is provided on the lamp board. The optical film layer is provided on the lamp board and covers the LED device, and the side wall surface of the optical film layer protrudes from the side surface of the lamp board, and the surface of the optical film layer facing the mounting surface, the side surface of the lamp board and the mounting surface define a receiving space. The frame is provided on the mounting surface of the housing, and the frame includes a light-blocking portion, and the light-blocking portion is located in the receiving space. In this way, by providing the light-blocking portion of the frame in the receiving space to block the light emitted from the LED device of the lamp board to the edge, it is possible to reduce the light from leaking directly from the edge without passing through the optical film layer, improve the optical poor problem of the edge bright line, and improve the uniformity of the light output brightness of the backlight module, so as to achieve good visual effects and product quality. The display module includes the above-mentioned backlight module, and the display module including the backlight module has good display effect and good product quality.

The embodiments of the present application provide a backlight module, which is described in detail below. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

1 , the first embodiment of the present application provides a backlight module 100, which includes a housing 10, a lamp board 20, an optical film layer 30, and a frame 40. The housing 10 is provided with a mounting surface 111, the lamp board 20 is provided on the mounting surface 111 of the housing 10, and an LED device 22 is provided on the lamp board 20. The optical film layer 30 is provided on the lamp board 20 and covers the LED device 22, and the side wall surface of the optical film layer 30 protrudes from the side surface of the lamp board 20, and the surface of the optical film layer 30 facing the mounting surface 111, the side surface of the lamp board 20, and the mounting surface 111 define a receiving space 20a. The frame 40 is provided on the mounting surface 111 of the housing 10, and the frame 40 includes a light blocking portion 41, and the light blocking portion 41 is located in the receiving space 20a.

In this way, by setting the light blocking portion 41 of the frame 40 in the accommodating space 20a to block the light emitted toward the edge by the LED device 22 of the light board 20, it is possible to reduce the light leakage directly from the edge without passing through the optical film layer 30, improve the optical defects of the edge bright line, and improve the uniformity of the light output brightness of the backlight module 100, so as to achieve good visual effects and product quality.

Referring to Figure 1, the lamp board 20 includes a driving substrate 21 disposed on the mounting surface 111, and the LED device 22 is fixed on the driving substrate 21 and electrically connected to the driving substrate 21 for driving. The driving substrate 21 can be one of a printed circuit board, a glass substrate or a polyimide substrate. When the driving substrate 21 adopts a glass substrate, since the glass substrate has a high flatness, when a driving circuit is made on the glass substrate to drive the LED device 22, an active driving scheme can be realized, thereby reducing the overall volume of the driving circuit and better reducing the power consumption of the driving circuit. The lamp board 20 also includes a packaging glue layer 23, which is formed on the driving substrate 21 and covers the LED device 22, so as to improve the protection of the LED device 22 and at the same time improve the flatness of the optical film layer 30 arranged on the lamp board 20. In addition, a diffusion film 60 is provided between the light board 20 and the optical film layer 30, and the diffusion film 60 covers the LED device 22 to correct the LED diffusion angle, thereby increasing the light radiation area, so that the light emitted by the LED device 22 can become a secondary light source with a larger area, better uniformity and stable chromaticity after being diffused by the diffusion film 60. The housing 10 can be made of metal material to improve the stability of the support.

Referring to FIG. 1 , optionally, the optical film layer 30 includes a filter layer 31 and a light conversion layer 32, the filter layer 31 is arranged on the light board 20, the light conversion layer 32 is stacked on the filter layer 31, and the LED device 22 is a blue light LED device 22. Among them, the LED device 22 can be selected as a Mini-LED (sub-millimeter light-emitting diode) LED device 22 or a Micro-LED (micro light-emitting diode) LED device 22, and the size of the Micro-LED device 22 can be less than 100 microns (μm), or even less than 50μm, which can provide a higher resolution and thus improve the luminous effect. The LED devices 22 are uniformly set as blue light LED devices 22, so as to facilitate the overall setting of the light board 20. Therefore, by setting the filter layer 31 to filter other stray light, color crosstalk is prevented, color purity is improved, and display effect is improved. The light conversion layer 32 is a quantum dot conversion layer, that is, it includes red light quantum dots and green light quantum dots, etc. The red light quantum dots and green light quantum dots emit red light and green light respectively under the excitation of blue light. The excited red light and green light are mixed with the blue light emitted by the blue light LED device 22 into white light, which can be used as the backlight source of the display panel.

In addition, the optical film layer 30 also includes a dichroic film 33 and a brightness enhancement film 34. The dichroic film 33 is arranged on the side of the light conversion layer 32 away from the filter layer 31, and the brightness enhancement film 34 is arranged on the side of the dichroic film 33 away from the light conversion layer 32. The dichroic film 33 is an optical film that can better achieve light diffusion. It should be noted that the dichroic film 33 can be set in multiple layers and stacked to further improve the diffusion of light, and the brightness enhancement film 34 can achieve the re-regulation of light and increase brightness. The brightness enhancement film includes a multi-functional prism sheet (Multi-Functional Prism Sheet).

Optionally, the surface of the light-blocking portion 41 facing away from the mounting surface 111 is connected to the surface of the optical film layer 30 facing the mounting surface 111. In this way, the light-blocking effect of the light-blocking portion 41 is further improved, and the light of the LED device 22 is prevented from leaking out of the accommodating space 20a. It should be noted that the vertical distance between the side surface of the light board 20 and the side surface of the optical film layer 30 is 1mm to 3mm, such as 1mm, 2mm and 3mm, so as to ensure that the light-blocking portion 41 is located in the accommodating space 20a to ensure the light-blocking effect, while avoiding the distance being too large to cause the volume of the backlight module 100 to be too large.

1, optionally, the light shielding portion 41 forms a reflective surface 411 on one side facing the light board 20. This arrangement can reflect the light blocked by the light shielding portion 41, which can not only solve the technical problem of poor dark edges of the backlight module 100, but also improve the utilization rate of the edge light, thereby improving the light output rate of the light board 20.

Optionally, a reflective sheet is attached to the side of the light shielding portion 41 facing the light board 20. The reflective surface 411 can be formed by attaching a reflective sheet to the side of the light shielding portion 41 facing the light board 20, so that the reflective surface 411 is formed in a simple, convenient and fast manner. It should be noted that a reflective film can also be plated on the side of the light shielding portion 41 facing the light board 20 or a highly reflective adhesive can be provided.

Referring to FIG. 1 , optionally, the reflective surface 411 is spaced apart from the side surface of the lamp board 20. It is understandable that, since the lamp board 20 is provided with a packaging glue layer 23 to protect the LED device 22, and the packaging glue layer 23 will expand and become larger when used for a long time, in order to avoid the possibility of the packaging glue layer 23 causing compression and damage to the LED device 22 after expansion, the reflective surface 411 is spaced apart from the side surface of the lamp board 20 to allow for expansion space, so as to ensure the normal service life of the LED device 22. Furthermore, the spacing distance between the reflective surface 411 and the side surface of the lamp board 20 is between 0.2 mm and 0.5 mm, such as 0.2 mm, 0.3 mm, and 0.4 mm, etc., so that the protection of the LED device 22 can be ensured, while avoiding the excessive spacing that causes the backlight module 100 to be too large.

Optionally, the distance between the reflective surface 411 and the side surface of the lamp board 20 gradually increases along the direction from the lamp board 20 to the optical film layer 30. In this way, the reflective surface 411 is arranged in an inclined plane, so that the reflective surface 411 can reflect more light to the optical film layer 30, thereby further improving the light extraction efficiency. The angle a between the reflective surface 411 and the mounting surface 111 is 0＜a≤45°, for example, 20°, 30° and 40°.

Referring to Fig. 1, optionally, the frame 40 includes a frame portion 42, the frame portion 42 is arranged on the side of the light blocking portion 41 away from the light board 20, and the side of the frame portion 42 away from the mounting surface 111 is flush with the side of the optical film layer 30 away from the light board 20. The frame portion 42 is provided to protect and shield the side surface of the optical film layer 30. In addition, the housing 10 may include a bottom plate 11 and a side plate 12, the upper surface of the bottom plate 11 is the mounting surface 111, the side plate 12 is provided at the edge of the mounting surface 111, and is spaced apart from the frame portion 42, so that when the frame portion 42 is formed of a colloid, there is expansion space when it is heated and expanded after long-term use, so as to improve the service life of the backlight module 100. Of course, the frame portion 42 can also be connected and fixed to the side plate 12 to further improve the stability of the frame portion 42 after it is provided.

Optionally, the light shielding portion 41 and the frame portion 42 are arranged at intervals. The light shielding portion 41 and the frame portion 42 are arranged separately, which not only improves the convenience of setting the light shielding portion 41 in the accommodating space 20a, but also the light shielding portion 41 and the frame portion 42 can be made of different materials to meet different setting requirements. The light shielding portion 41 and the frame portion 42 can be directly injection molded on the mounting surface 111, or the light shielding portion 41 and the frame portion 42 can be fixed to the mounting surface 111 by bonding after being molded, so as to control the setting position of the light shielding portion 41 and the frame portion 42.

Referring to FIG. 1 , optionally, the backlight module 100 further includes a light shielding layer 50, which is disposed on the frame portion 42 and extends above a partial area of the optical film layer 30 on a side facing away from the light board 20. It is understandable that there is a gap between the frame portion 42 and the side surface of the optical film layer 30, so as to avoid the optical film layer 30 from being wrinkled due to squeezing after the frame portion 42 is set, so as to ensure the stability of the optical film layer 30 after the setting. The light shielding layer 50 is provided to block the gap between the frame portion 42 and the side surface of the optical film layer 30, so as to avoid light leakage from this area. The light shielding layer 50 is a double-sided light shielding tape, which not only plays a light shielding role, but also the double-sided light shielding tape is respectively bonded and fixed to the optical film layer 30 and the frame portion 42 to prevent the two from sliding, so as to further improve the stability of the optical film layer 30 and the frame portion 42 after the setting.

In another embodiment, the difference between this embodiment and the above embodiment is that the side of the frame body away from the mounting surface is higher than the side of the optical film layer away from the light board, so as to further improve the protection and shielding effect of the frame body.

2 , in another embodiment, the difference between this embodiment and the above embodiment is that the light shielding portion 41 and the frame portion 42 are integrally provided. In this way, the frame 40 can be integrally formed by injection molding or the like, which not only improves the overall setting efficiency of the frame 40, but also improves the overall stability of the frame 40.

The present application also provides a display module, including the above-mentioned backlight module. The backlight module includes a housing, a light board, an optical film layer and a frame. The housing is provided with a mounting surface, the light board is provided on the mounting surface of the housing, and an LED device is provided on the light board. The optical film layer is provided on the light board and covers the LED device, and the side wall surface of the optical film layer protrudes from the side surface of the light board, and the surface of the optical film layer facing the mounting surface, the side surface of the light board and the mounting surface define an accommodating space. The frame is provided on the mounting surface of the housing, and the frame includes a light blocking portion, and the light blocking portion is located in the accommodating space.

Optionally, the display module further includes a liquid crystal display panel, and the liquid crystal display panel is arranged on the light emitting side of the backlight module.

The above is a detailed introduction to a backlight module and a display module provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

A backlight module, comprising:

A housing, wherein the housing is provided with a mounting surface;

A light board, the light board is arranged on the mounting surface of the housing, and the light board is provided with an LED device;

an optical film layer, the optical film layer being disposed on the lamp board and covering the LED device, and the side wall surface of the optical film layer protruding from the side surface of the lamp board, and the surface of the optical film layer facing the mounting surface, the side surface of the lamp board and the mounting surface defining an accommodating space; and

A frame is arranged on the installation surface of the shell, and the frame includes a light blocking portion, and the light blocking portion is located in the accommodating space.
The backlight module as claimed in claim 1, wherein the light blocking portion forms a reflective surface on a side facing the light board.
The backlight module as claimed in claim 2, wherein a reflective sheet is attached to a side of the light blocking portion facing the light board.
The backlight module as claimed in claim 2, wherein the reflective surface is spaced apart from the side surface of the light board.
The backlight module as claimed in claim 4, wherein the spacing distance between the reflective surface and the side surface of the light board gradually increases along the direction of the light board toward the optical film layer.
The backlight module according to claim 1, wherein the frame comprises a frame portion, and the frame portion is arranged on a side of the light blocking portion away from the light board;

A side of the frame portion facing away from the mounting surface is flush with a side of the optical film layer facing away from the light board.
The backlight module according to claim 1, wherein the frame comprises a frame portion, and the frame portion is arranged on a side of the light blocking portion away from the light board;

A side of the frame portion facing away from the mounting surface is higher than a side of the optical film layer facing away from the light board.
The backlight module as described in claim 6, wherein the light blocking portion and the frame portion are integrally arranged.
The backlight module according to claim 6, wherein the light blocking portion and the frame portion are spaced apart.
The backlight module as described in claim 6, wherein the backlight module further comprises a shading layer, wherein the shading layer is disposed on the frame portion and extends above a partial area of a side of the optical film layer away from the light board.
The backlight module as described in claim 7, wherein the light blocking portion and the frame portion are integrally arranged.
The backlight module according to claim 7, wherein the light blocking portion and the frame portion are spaced apart.
The backlight module as described in claim 7, wherein the backlight module further comprises a shading layer, wherein the shading layer is disposed on the frame portion and extends above a partial area of a side of the optical film layer away from the light board.
The backlight module as described in claim 1, wherein the optical film layer includes a filter layer and a light conversion layer, the filter layer is arranged on the light board, the light conversion layer is stacked on the filter layer, and the LED device is a blue light LED device.
A display module includes a backlight module, wherein the backlight module includes:

A housing, wherein the housing is provided with a mounting surface;

A light board, the light board is arranged on the mounting surface of the housing, and the light board is provided with an LED device;

an optical film layer, the optical film layer being disposed on the lamp board and covering the LED device, and the side wall surface of the optical film layer protruding from the side surface of the lamp board, and the surface of the optical film layer facing the mounting surface, the side surface of the lamp board and the mounting surface defining an accommodating space; and

A frame is arranged on the installation surface of the shell, and the frame includes a light blocking portion, and the light blocking portion is located in the accommodating space.
The display module as claimed in claim 15, wherein the light blocking portion forms a reflective surface on a side facing the light board.
The display module as claimed in claim 16, wherein a reflective sheet is attached to a side of the light blocking portion facing the light board.
The display module as claimed in claim 16, wherein the reflective surface is spaced apart from the side surface of the light panel.
The display module as described in claim 18, wherein the spacing distance between the reflective surface and the side surface of the light board gradually increases along the direction of the light board toward the optical film layer.
The display module according to claim 15, wherein the frame comprises a frame portion, and the frame portion is arranged on a side of the light blocking portion away from the light board;

A side of the frame portion facing away from the mounting surface is flush with a side of the optical film layer facing away from the light board.