CN115826296A

CN115826296A - Backlight module

Info

Publication number: CN115826296A
Application number: CN202211644650.0A
Authority: CN
Inventors: 章泽; 朱磊
Original assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Priority date: 2022-12-20
Filing date: 2022-12-20
Publication date: 2023-03-21
Anticipated expiration: 2042-12-20
Also published as: CN115826296B; WO2024131420A1

Abstract

The embodiment of the application discloses a backlight module, which comprises a shell, wherein the shell is provided with a mounting surface; the lamp panel is arranged on the mounting surface of the shell, and an LED device is arranged on the lamp panel; the optical film layer is arranged on the lamp panel and covers the LED devices, the side wall surface of the optical film layer protrudes out of the side surface of the lamp panel, and the surface, facing the mounting surface, of the optical film layer, the side surface of the lamp panel and the mounting surface define an accommodating space; and the frame is arranged on the mounting surface of the shell and comprises a light blocking part, and the light blocking part is positioned in the accommodating space. The application aims to solve the problem of poor optics of the edge bright line of the backlight module.

Description

Backlight module

Technical Field

The application relates to the technical field of display, in particular to a backlight module.

Background

With the rapid development of display technology, liquid crystal display technology is widely applied in the display field. The lcd panel itself cannot emit light, and the backlight module is required to provide the brightness required for the display. A Mini-LED (Mini-LED) has become a research focus in the current display technology field as a backlight, and the Mini-LED has the characteristics of good display performance, low power and high brightness. In the research and practice process of the prior art, the inventor of the application finds that the edge large-angle light of the backlight module of the prior Mini-LED is not directly emitted through the optical film layer, so that the luminous effect of the edge area is different from that of the surface area, and the problem of poor optics is caused by edge light leakage. Therefore, there is a need to develop a backlight module to overcome the drawbacks of the prior art.

Disclosure of Invention

The embodiment of the application provides a backlight module, which can solve the problem of poor optics of edge bright lines of the backlight module.

The embodiment of the application provides a backlight module, include:

a housing having a mounting face;

the lamp panel is arranged on the mounting surface of the shell, and an LED device is arranged on the lamp panel;

the optical film layer is arranged on the lamp panel and covers the LED devices, the side wall surface of the optical film layer protrudes out of the side surface of the lamp panel, and the surface, facing the mounting surface, of the optical film layer, the side surface of the lamp panel and the mounting surface define an accommodating space; and

the frame is arranged on the mounting surface of the shell and comprises a light blocking part, and the light blocking part is located in the accommodating space.

Optionally, in some embodiments of the present application, a reflective surface is formed on a side of the light blocking portion facing the lamp panel.

Optionally, in some embodiments of the present application, a reflective sheet is attached to a surface of the light blocking portion facing the lamp panel.

Optionally, in some embodiments of the present application, the reflecting surface is spaced apart from a side surface of the lamp panel.

Optionally, in some embodiments of the present application, a distance between the reflection surface and a side surface of the lamp panel is gradually increased along a direction of the lamp panel toward the optical film layer.

Optionally, in some embodiments of the present application, the bezel includes a frame portion, and the frame portion is disposed on a side of the light blocking portion away from the lamp panel;

one surface of the frame body part, which is far away from the mounting surface, is flush with one surface of the optical film layer, which is far away from the lamp panel; or one surface of the frame body part deviating from the mounting surface is higher than one surface of the optical film layer deviating from the lamp panel.

Optionally, in some embodiments of the present application, the light blocking portion and the frame portion are integrally provided.

Optionally, in some embodiments of the present application, the light blocking portion and the frame portion are disposed at an interval.

Optionally, in some embodiments of the application, the backlight module further includes a light shielding layer, the light shielding layer is disposed on the frame portion, and extends to the top of the partial region where the optical film layer deviates from the one surface of the lamp panel.

Optionally, in some embodiments of the present application, the optical film layer includes a filter layer and a light conversion layer, the filter layer is disposed on the lamp panel, the light conversion layer is stacked on the filter layer, and the LED device is a blue LED device.

The embodiment of the application adopts a backlight module which comprises a shell, a lamp panel, an optical film layer and a frame. This shell is equipped with the installation face, and on the installation face of shell was located to the lamp plate, be equipped with the LED device on the lamp plate. The optical film layer is arranged on the lamp panel and covers the LED device, the side wall surface of the optical film layer protrudes out of the side surface of the lamp panel, and the surface of the optical film layer facing the installation surface, the side surface of the lamp panel and the installation surface define an accommodating space. The frame is arranged on the mounting surface of the shell and comprises a light blocking part, and the light blocking part is positioned in the accommodating space. So locate the LED device directive edge's light of lamp plate in order to shelter from in the accommodation space through the portion that is in the light with the frame to can reduce light and spill directly from the edge through the optics rete, improve the optics bad problem of marginal bright line, improve backlight unit's the homogeneity of light-emitting luminance, in order to reach good visual effect and product quality.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a backlight module according to another embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless indicated to the contrary, the use of the directional terms "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, and more particularly to the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.

The embodiment of the application provides a backlight module. The following are detailed descriptions. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.

Referring to fig. 1, a backlight module 100 according to a first embodiment of the present disclosure includes a housing 10, a lamp panel 20, an optical film 30, and a frame 40. This shell 10 is equipped with installation face 111, and lamp plate 20 is equipped with LED device 22 on lamp plate 20 on the installation face 111 of shell 10. The optical film 30 is disposed on the lamp panel 20 and covers the LED device 22, a side wall surface of the optical film 30 protrudes out of a side surface of the lamp panel 20, and a surface of the optical film 30 facing the mounting surface 111, the side surface of the lamp panel 20, and the mounting surface 111 define an accommodating space 20a. The frame 40 is disposed 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 accommodating space 20a.

So locate the light of LED device 22 directive edge of lamp plate 20 in order to shelter from in accommodation space 20a through the portion 41 that is in the light that is in the frame 40 to can reduce light and directly spill from the edge through optical film layer 30, improve the bad problem of optics of marginal bright line, improve backlight unit 100's the homogeneity of light-emitting luminance, in order to reach good visual effect and product quality.

Referring to fig. 1, the lamp panel 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 may be one of a printed circuit board, a glass substrate, or a polyimide substrate. When the driving substrate 21 is a glass substrate, the glass substrate has high flatness, so that an active driving scheme can be realized when the driving circuit is manufactured on the glass substrate to drive the LED device 22, thereby reducing the overall size of the driving circuit and better reducing the power consumption of the driving circuit. This lamp plate 20 still includes encapsulation glue film 23, and this encapsulation glue film 23 is formed on drive base plate 21 and covers LED device 22, so in order to improve the protection to LED device 22, improves the planarization that optics rete 30 set up on lamp plate 20 simultaneously. In addition, a diffusion film 60 is further disposed between the lamp panel 20 and the optical film layer 30, and the diffusion film 60 covers the LED device 22 to correct the LED diffusion angle, so that the light radiation area is increased, and light emitted by the LED device 22 can be changed into a secondary light source with a larger area, better uniformity and stable chromaticity after being diffused by the diffusion film 60. The housing 10 may be made of metal 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 disposed on the lamp panel 20, the light conversion layer 32 is stacked on the filter layer 31, and the LED device 22 is a blue LED device 22. The LED device 22 can be a Mini-LED (submillimeter light-emitting diode) LED device 22 or a Micro-LED (Micro light-emitting diode) LED device 22, the size specification of the Mini-LED device 22 is in a micron order, higher resolution can be provided, and the light-emitting effect is further improved. And the LED devices 22 are collectively configured as blue LED devices 22, so as to facilitate the overall configuration of the lamp panel 20. Thereby through setting up filter layer 31 in order filtering other miscellaneous light, prevented that the colour from crosstalking, improved the colour purity, promoted the display effect. The light conversion layer 32 is a quantum dot conversion layer, that is, includes red light quantum dots, green light quantum dots, and the like, the red light quantum dots and the green light quantum dots respectively emit red light and green light under the excitation of blue light, and the excited red light and green light are mixed with the blue light emitted by the blue light LED device 22 to form white light, so that the white light can be used as a backlight source of the display panel.

In addition, the optical film layer 30 further includes a light splitting film 33 and a brightness enhancement film 34, the light splitting film 33 is disposed on a side of the light conversion layer 32 facing away from the filter layer 31, and the brightness enhancement film 34 is disposed on a side of the light splitting film 33 facing away from the light conversion layer 32. The light splitting film 33 is an optical thin film disposed on the light splitting film 33, so that light can be diffused better. The light splitting films 33 may be stacked in multiple layers to further improve light diffusion, and the brightness enhancement film 34 can achieve light readjustment and brightness enhancement. The brightness enhancement film includes a multifunctional Prism Sheet (Multi Functional Prism Sheet).

Alternatively, 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 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 lamp panel 20 and the side surface of the optical film layer 30 is 1mm to 3mm, for example, 1mm, 2mm, 3mm, etc., so that the light blocking portion 41 is ensured to be located in the accommodating space 20a to ensure the light blocking effect, and the excessive volume of the backlight module 100 caused by the excessive distance is avoided.

Referring to fig. 1, optionally, the light blocking part 41 forms a reflective surface 411 toward one side of the lamp panel 20. So set up and can reflect the light that light portion 41 sheltered from so not only can be poor technical problem in backlight unit 100 edge dark margin, can promote the utilization ratio of marginal light simultaneously, and then improve the light-emitting rate of lamp plate 20.

Further, a reflective sheet is attached to a surface of the light blocking portion 41 facing the lamp panel 20. The reflecting surface 411 can be formed by attaching a reflecting sheet to one surface of the light blocking portion 41 facing the lamp panel 20, so that the forming mode of the reflecting surface 411 is simple, convenient and fast. The light blocking portion 41 may be coated with a reflective film or a highly reflective glue on the surface facing the lamp panel 20.

Referring to fig. 1, optionally, the reflecting surface 411 is spaced apart from a side surface of the lamp panel 20. It can be understood that, because be provided with encapsulation glue film 23 on lamp plate 20 and protect LED device 22, and can expand the grow when using encapsulation glue film 23 for a long time, so avoid encapsulating glue film 23 inflation back to cause the possibility of suppression damage to LED device 22 to so that the reflector 411 sets up in order to have the inflation space with the side surface interval of lamp plate 20, in order to guarantee LED device 22's normal life. Further, the distance between the reflective surface 411 and the side surface of the lamp panel 20 is 0.2mm to 0.5mm, such as 0.2mm, 0.3mm, and 0.4mm, so as to ensure the protection of the LED device 22 and avoid the oversize space to cause the oversize volume of the backlight module 100.

Further, the distance between the reflective surface 411 and the side surface of the lamp panel 20 gradually increases along the direction of the lamp panel 20 toward the optical film 30. Therefore, the reflective surface 411 is disposed in an inclined plane, so that the reflective surface 411 can reflect more light to the optical film 30, thereby further improving the light-emitting efficiency. And the included angle a between the reflecting surface 411 and the mounting surface 111 is 0 < a ≦ 45 degrees, such as 20 degrees, 30 degrees, 40 degrees and the like.

Referring to fig. 1, optionally, the bezel 40 includes a frame portion 42, the frame portion 42 is disposed on a side of the light blocking portion 41 away from the lamp panel 20, and a surface of the frame portion 42 away from the mounting surface 111 is flush with a surface of the optical film layer 30 away from the lamp panel 20. Wherein the frame body 42 is arranged 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, wherein the top surface of the bottom plate 11 is a mounting surface 111, the side plate 12 is disposed at an edge of the mounting surface 111 and spaced apart from the frame portion 42, so that when the frame portion 42 is formed of a glue, an expansion space exists when the frame portion is expanded by heat after a long time use, thereby prolonging the service life of the backlight module 100. Of course, the frame portion 42 may be connected and fixed to the side plate 12 to further improve the stability of the frame portion 42 after installation.

Further, the light blocking portion 41 and the frame portion 42 are provided at an interval. The light blocking portion 41 and the frame portion 42 are separated from each other, so that convenience of disposing the light blocking portion 41 in the accommodating space 20a is improved, that is, the light blocking portion 41 and the frame portion 42 may be made of different materials, so as to meet different setting requirements. The light blocking portion 41 and the frame portion 42 may be directly formed on the mounting surface 111 by injection molding, or the light blocking portion 41 and the frame portion 42 may be fixed to the mounting surface 111 by adhesion after molding, so as to control the installation positions of the light blocking portion 41 and the frame portion 42.

Referring to fig. 1, optionally, the backlight module 100 further includes a light shielding layer 50, where the light shielding layer 50 is disposed on the frame portion 42 and extends above a partial area of one surface of the optical film layer 30 facing away from the lamp panel 20. It can be understood that the frame portion 42 is spaced from the side surface of the optical film 30, so as to prevent the frame portion 42 from being pressed after the setting to wrinkle the optical film 30, and to ensure the stability of the optical film 30 after the setting. The light-shielding layer 50 is disposed to shield the gap between the frame portion 42 and the side surface of the optical film layer 30, so as to prevent light from leaking from this region. The light-shielding layer 50 is a double-sided light-shielding tape, which not only can play a role of shielding light, but also can be used to bond and fix the optical film layer 30 and the frame body 42 respectively to prevent the optical film layer 30 and the frame body 42 from sliding, so as to further improve the stability of the optical film layer 30 and the frame body 42 after being arranged.

In another embodiment, the present embodiment is different from the above embodiments in that: the one side that the frame body deviates from the installation face is higher than the one side that the optics rete deviates from the lamp plate. Thus, the protection and shielding effects of the frame part are further improved.

Referring to fig. 2, in another embodiment, the present embodiment is different from the above embodiment in that: the light blocking portion 41 and the frame portion 42 are integrally provided. So that frame 40 can not only improve the holistic efficiency that sets up of frame 40 through mode integrated into one piece such as moulding plastics, can improve the holistic stability of frame 40 simultaneously.

The lower case of the battery pack and the battery pack thereof provided by the embodiment of the present application are described in detail above, and a specific example is applied to illustrate the principle and the implementation manner of the present application, and the description of the above embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A backlight module, comprising:

a housing having a mounting face;

2. The backlight module as claimed in claim 1, wherein a reflecting surface is formed on a side of the light blocking part facing the lamp panel.

3. The backlight module of claim 2, wherein a reflective sheet is attached to a surface of the light blocking part facing the lamp panel.

4. The backlight module of claim 2, wherein the reflective surface is spaced apart from a side surface of the lamp panel.

5. The backlight module of claim 4, wherein a distance between the reflecting surface and the side surface of the lamp panel gradually increases along a direction of the lamp panel toward the optical film layer.

6. The backlight module according to any one of claims 1 to 5, wherein the bezel comprises a frame portion, and the frame portion is disposed on a side of the light blocking portion away from the lamp panel;

7. The backlight module according to claim 6, wherein the light blocking part and the frame part are integrally provided.

8. The backlight module according to claim 6, wherein the light blocking part and the frame part are spaced apart from each other.

9. The backlight module as claimed in claim 6, wherein the backlight module further comprises a light shielding layer disposed on the frame portion and extending above a partial area of one surface of the optical film layer facing away from the lamp panel.

10. The backlight module according to any one of claims 1 to 5, wherein the optical film comprises a filter layer and a light conversion layer, the filter layer is disposed on the lamp panel, the light conversion layer is stacked on the filter layer, and the LED devices are blue LED devices.