CN115826296A - Backlight module - Google Patents

Abstract

The embodiment of the present application discloses a backlight module. The backlight module includes a housing, the housing is provided with a mounting surface; a lamp board, the lamp board is disposed on the mounting surface of the housing, the lamp board is provided LED device; an optical film layer, the optical film layer is arranged 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 optical film layer protrudes from the side surface of the lamp board. The surface of the film layer facing the installation surface, the side surface of the lamp board and the installation surface define an accommodation space; and a frame, the frame is arranged on the installation surface of the housing, and the frame includes a stop A light part, the light blocking part is located in the accommodating space. The purpose of this application is to improve the optical defect of the edge bright line of the backlight module.

Description

Backlight module

technical field

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

Background technique

With the rapid development of display technology, liquid crystal display technology is widely used in the display field. The liquid crystal display panel itself cannot emit light, and needs a backlight module to provide the brightness required for its display. Mini-Light Emitting Diode (Mini-LED) as a backlight has become a research hotspot in the current display technology field. Mini-LED has the characteristics of good display performance, low power and high brightness. During the research and practice of the existing technology, the inventors of the present application found that the light at the edge of the existing Mini-LED backlight module is directly emitted at a large angle without passing through the optical film layer, so that the luminous effect of the edge area and the in-plane Areas are illuminated differently, resulting in poor optics due to light leakage around the edges. Therefore, it is really necessary to develop a backlight module to overcome the defects of the prior art.

Contents of the invention

The embodiment of the present application provides a backlight module, which can improve the optical defect of edge bright lines of the backlight module.

An embodiment of the present application provides a backlight module, including:

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

A lamp board, the lamp board is arranged on the mounting surface of the housing, and the lamp board is provided with LED devices;

An optical film layer, the optical film layer is arranged 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 optical film layer faces The surface of the installation surface, the side surface of the lamp board and the installation surface define an accommodating space; and

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

Optionally, in some embodiments of the present application, a side of the light blocking portion facing the light board forms a reflective surface.

Optionally, in some embodiments of the present application, a reflective sheet is attached to a side of the light shielding portion facing the light board.

Optionally, in some embodiments of the present application, the reflective surface is spaced apart from the side surface of the light board.

Optionally, in some embodiments of the present application, the 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.

Optionally, in some embodiments of the present application, the frame includes a frame part, and the frame part is provided on a side of the light shielding part away from the light board;

The side of the frame part away from the installation surface is flush with the side of the optical film layer away from the light board; or, the side of the frame part away from the installation surface is higher than the side of the optical film layer away from the light board one side of the lamp panel.

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

Optionally, in some embodiments of the present application, the light blocking portion and the frame portion are arranged at intervals.

Optionally, in some embodiments of the present application, the backlight module further includes a light-shielding layer, the light-shielding layer is arranged on the frame part, and extends the side of the optical film layer away from the light board part of the area above.

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 arranged on the light board, and the light conversion layer is stacked on the filter On the optical layer, the LED device is a blue LED device.

The embodiment of the present application adopts a backlight module, and the backlight module includes a housing, a light board, an optical film layer, and a frame. The housing is provided with a mounting surface, a lamp board is arranged on the mounting surface of the housing, and an LED device is arranged on the lamp board. The optical film layer is arranged 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. setting space. The frame is arranged on the installation surface of the shell, and the frame includes a light blocking part, and the light blocking part is located in the accommodation space. In this way, by setting the light blocking part of the frame in the accommodating space to block the light emitted from the LED device of the lamp panel to the edge, it is possible to reduce the leakage of light directly from the edge without passing through the optical film layer, and improve the optical defect of the bright line at the edge. Improve the uniformity of the light output brightness of the backlight module to achieve good visual effects and product quality.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic structural view of a backlight module provided by an embodiment of the present application;

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

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application. In addition, it should be understood that the specific implementations described here are only used to illustrate and explain the present application, and are not intended to limit the present application. In this application, unless stated to the contrary, the used orientation words such as "up" and "down" usually refer to up and down in the actual use or working state of the device, specifically the direction of the drawing in the drawings ; while "inside" and "outside" refer to the outline of the device.

An embodiment of the present application provides a backlight module. Each will be described in detail below. It should be noted that the description sequence of the following embodiments is not intended to limit the preferred sequence of the embodiments.

Referring to FIG. 1 , the first embodiment of the present application provides a backlight module 100 , which includes a housing 10 , a lamp panel 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 disposed on the mounting surface 111 of the housing 10 , and the lamp board 20 is provided with an LED device 22 . The optical film layer 30 is arranged 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 installation surface 111, the surface of the lamp board 20 The side surface and the installation surface 111 define the accommodating space 20a. The frame 40 is disposed on the installation 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 20 a.

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

Referring to FIG. 1 , the lamp board 20 includes a driving substrate 21 disposed on a mounting surface 111 , and the LED device 22 is fixed on the driving substrate 21 and is 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 adopts a glass substrate, since the glass substrate has high flatness, when the 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. , to better reduce the power consumption of the drive line. The light board 20 also includes an encapsulation adhesive 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 improve the optical film layer 30 disposed on the light board 20. of flatness. In addition, a diffusion film 60 is also provided between the light board 20 and the optical film layer 30, and the diffusion film 60 covers the LED device 22 to play a role in correcting the diffusion angle of the LED and increase the light radiation area so that the LED After the light emitted by the device 22 is diffused by the diffusion film 60, it can become a secondary light source with larger area, better uniformity and stable chromaticity. The housing 10 can 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 arranged on the light board 20, the light conversion layer 32 is stacked on the filter layer 31, and the LED device 22 is Blue LED device 22 . Among them, the LED device 22 can be selected as a Mini-LED (submillimeter light-emitting diode) LED device 22 or a Micro-LED (micro-light-emitting diode) LED device 22, and the size specification of the Mini-LED device 22 is at the micron level, which can provide higher resolution, thereby improving the luminous effect. The LED devices 22 are uniformly configured as blue LED devices 22 , so as to facilitate the overall configuration of the lamp panel 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 enhanced. The light conversion layer 32 is a quantum dot conversion layer, including red light quantum dots and green light quantum dots, etc., and the red light quantum dots and 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 and The blue light emitted by the blue LED device 22 is mixed into white light, so that it can be used as a backlight source of the display panel.

In addition, the optical film layer 30 also includes a light-splitting film 33 and a light-enhancing film 34. The light-splitting film 33 is arranged on the side of the light conversion layer 32 facing away from the filter layer 31. one side. The light-splitting film 33 is an optical thin film disposed on the light-splitting film 33 , which can better realize light diffusion. It should be noted that the light-splitting film 33 can be provided with multiple layers and stacked to further improve the diffusion of light, and the light-enhancing film 34 can re-adjust the light and increase the brightness. The brightness enhancement film includes a multifunctional prism sheet (Multi Functional Prism Sheet).

Optionally, the surface of the light blocking portion 41 away from the installation surface 111 is connected to the surface of the optical film layer 30 facing the installation surface 111 . In this way, the light-shielding effect of the light-shielding 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 that the light blocking part 41 is ensured to be located in the accommodating space 20a The size of the backlight module 100 is large enough to ensure the light-shielding effect, and at the same time, avoid the excessive volume of the backlight module 100 due to the large distance.

Referring to FIG. 1 , optionally, a reflective surface 411 is formed on a side of the light blocking portion 41 facing the lamp panel 20 . Such setting can reflect the light blocked by the light blocking portion 41 , so that not only the technical problem of poor dark edges at the edge of the backlight module 100 can be solved, but also the utilization rate of the light at the edge can be improved, thereby increasing the light output rate of the lamp panel 20 .

Further, a reflective sheet is attached to the side of the light blocking portion 41 facing the lamp panel 20 . Wherein, the reflective surface 411 can be formed by affixing a reflective sheet on the side of the light blocking portion 41 facing the lamp panel 20 , so that the formation of the reflective surface 411 is simple, convenient and fast. It should be noted that it is also possible to coat the side of the light-shielding portion 41 facing the lamp panel 20 with a reflective film or provide high-reflective glue.

Referring to FIG. 1 , optionally, the reflective surface 411 is spaced apart from the side surface of the lamp panel 20 . It can be understood that since the lamp panel 20 is provided with an encapsulation adhesive layer 23 to protect the LED device 22, the encapsulation adhesive layer 23 will expand and become larger when used for a long time, so in order to avoid the expansion of the encapsulation adhesive layer 23, the LED device 22 The possibility of pressing damage is caused, so that the reflective surface 411 is spaced from the side surface of the lamp board 20 so that there is an expansion space, so as to ensure the normal service life of the LED device 22 . Further, the distance between the reflective surface 411 and the side surface of the lamp panel 20 is between 0.2 mm and 0.5 mm, such as 0.2 mm, 0.3 mm, and 0.4 mm, so that the protection of the LED device 22 can be ensured, and at the same time It is avoided that the backlight module 100 is too bulky due to too large interval.

Further, the distance between the reflective surface 411 and the side surface of the lamp board 20 gradually increases along the direction of the lamp board 20 toward the optical film layer 30 . In this way, the reflective surface 411 is arranged on 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 included angle a between the reflective surface 411 and the installation 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 shielding portion 41 away from the lamp panel 20 , and the side of the frame portion 42 facing away from the installation surface 111 is away from the optical film layer 30 One side of the light board 20 is flush. Wherein, the side surface of the optical film layer 30 is protected and shielded by setting the frame portion 42 . 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 arranged on the edge of the mounting surface 111, and is spaced from the frame portion 42, so as to act as the frame portion When 42 is made of colloid, there is room for expansion when 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 being installed.

Further, the light blocking portion 41 and the frame portion 42 are arranged at intervals. Wherein, the light blocking part 41 and the frame body part 42 are provided separately, not only to improve the convenience for the light blocking part 41 to be arranged in the accommodating space 20a, that is, the light blocking part 41 and the frame body part 42 can be made of different materials. to meet different setting requirements. The light-shielding portion 41 and the frame body portion 42 can be respectively injection molded directly on the mounting surface 111, or the light-shielding portion 41 and the frame body portion 42 can be fixed to the mounting surface 111 by bonding after molding, so as to facilitate The installation positions of the light blocking portion 41 and the frame portion 42 are controlled.

Referring to FIG. 1 , optionally, the backlight module 100 further includes a light-shielding layer 50 . The light-shielding layer 50 is disposed on the frame portion 42 and extends over a part of the side of the optical film layer 30 facing away from the lamp panel 20 . It can be understood that there is a gap between the frame portion 42 and the side surface of the optical film layer 30, so as to prevent the frame portion 42 from being squeezed after setting and causing the optical film layer 30 to wrinkle, so as to ensure the optical film layer 30 after setting. stability. The light shielding layer 50 is provided to shield the distance between the frame body portion 42 and the side surface of the optical film layer 30 to prevent light from leaking from this area. The light-shielding layer 50 is a double-sided light-shielding tape, which not only can play a light-shielding effect, but also adheres and fixes the optical film layer 30 and the frame body portion 42 respectively to prevent the two from sliding, so as to further improve the optical film layer 30. And the stability after the frame body part 42 is set.

In another embodiment, the difference between this embodiment and the above-mentioned embodiments is that: the side of the frame body away from the installation surface is higher than the side of the optical film layer away from the light board. In this way, the protection and shielding effect of the frame body can be further improved.

Referring to FIG. 2 , in yet another embodiment, the difference between this embodiment and the above-mentioned embodiments lies in that: the light blocking portion 41 and the frame portion 42 are integrally arranged. In this way, the frame 40 can be integrally formed by injection molding, etc., which not only improves the installation efficiency of the frame 40 as a whole, but also improves the stability of the frame 40 as a whole.

A battery pack lower box and its battery pack provided by the embodiments of the present application have been described above in detail. In this paper, specific examples are used to illustrate the principles and implementation methods of the present application. The descriptions of the above embodiments are only for To help understand the method and its core idea of this application; at the same time, for those skilled in the art, according to the idea of this application, there will be changes in the specific implementation and application scope. In summary, the content of this specification does not It should be understood as a limitation on the present application.

Claims (10)

1. A backlight module, characterized in that, comprising: a housing, the housing is provided with a mounting surface; A lamp board, the lamp board is arranged on the mounting surface of the housing, and the lamp board is provided with LED devices; An optical film layer, the optical film layer is arranged 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 optical film layer faces The surface of the installation surface, the side surface of the lamp board and the installation surface define an accommodating space; and A frame, the frame is arranged on the installation surface of the housing, and the frame includes a light blocking part, and the light blocking part is located in the accommodating space. 2 . The backlight module according to claim 1 , wherein the side of the light shielding portion facing the light board forms a reflective surface. 3 . 3 . The backlight module according to claim 2 , wherein a reflection sheet is attached to a side of the light shielding portion facing the light board. 4 . 4. The backlight module according to claim 2, wherein the reflective surface is spaced apart from the side surface of the light board. 5 . The backlight module according to claim 4 , wherein the distance between the reflective surface and the side surface of the lamp board gradually increases along the direction of the lamp board toward the optical film layer. 6. The backlight module according to any one of claims 1 to 5, wherein the frame includes a frame portion, and the frame portion is arranged on a side of the light shielding portion away from the light board. side; The side of the frame part away from the installation surface is flush with the side of the optical film layer away from the light board; or, the side of the frame part away from the installation surface is higher than the side of the optical film layer away from the light board one side of the lamp panel. 7. The backlight module according to claim 6, wherein the light shielding portion and the frame portion are integrally provided. 8 . The backlight module according to claim 6 , wherein the light shielding portion and the frame portion are arranged at intervals. 9. The backlight module as claimed in claim 6, wherein the backlight module further comprises a light-shielding layer, the light-shielding layer is arranged on the frame part, and extends the optical film layer away from the Above the partial area of one side of the light board. 10. The backlight module according to any one of claims 1 to 5, wherein the optical film layer comprises a filter layer and a light conversion layer, and the filter layer is arranged on the lamp board, so that The light conversion layer is stacked on the filter layer, and the LED device is a blue LED device.

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