WO2019010974A1

WO2019010974A1 - Backlight module and liquid crystal display device

Info

Publication number: WO2019010974A1
Application number: PCT/CN2018/076288
Authority: WO
Inventors: 唐志强
Original assignee: 青岛海信电器股份有限公司
Priority date: 2017-07-12
Filing date: 2018-02-11
Publication date: 2019-01-17
Also published as: CN107203069A

Abstract

A backlight module (200) and a liquid crystal display device. The backlight module (200) comprises a light guide plate (210), a back plate (211), a front frame (212), an LED lamp (213), and a PCB (214), wherein the light guide plate (210) comprises a light incident side on a side surface thereof; the LED lamp (213) is disposed opposite the light incident side of the light guide plate (210); the back plate (211) is disposed below the light guide plate (210), and the length of the back plate (211) is greater than the length of the light guide plate (210) in the direction of the light incident side facing the LED lamp (213); the front frame (212) comprises a first bottom edge (2121) that is parallel to the back plate (211) and extends in the direction of the light incident side facing the LED lamp (213), and a first vertical edge (2122) that is connected to the back plate (211) and the first bottom edge (2121) on one side, away from the light incident side, of the first bottom edge (2121) and is perpendicular to the back plate (211) and the first bottom edge (2121); the PCB (214) is laid above the back plate (211) in a direction away from the light incident side and is electrically connected to the LED lamp (213); and the first bottom edge (2121), the first vertical edge (2122) and the back plate (211) form an accommodating space for placing the LED lamp (213) and the PCB (214). The liquid crystal display device comprises a liquid crystal panel (217) and a backlight module (200).

Description

Backlight module and liquid crystal display device

The present application claims priority to Chinese Patent Application No. 200910567099.7, entitled "Backlight Module and Liquid Crystal Display Device", filed on July 12, 2017, the entire contents of which are incorporated herein by reference. In the application.

Technical field

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

Background technique

In the field of ultra-thin display devices, wall-mounted liquid crystal display devices are becoming more and more popular, and the thinning of liquid crystal display devices is becoming more and more popular, and the thinness of display devices not only reduces the weight of display devices. It is conducive to the stability of the suspension, but also caters to the aesthetic needs of consumers.

1 is a schematic structural view of a liquid crystal display device in the related art. As shown in FIG. 1 , the display device 100 includes a front frame 110 , a liquid crystal panel 111 , a light guide plate 112 , a back plate 113 , and a heat sink 114 on a lower surface of the back plate 113 , a driving plate 115 and a flexible connection between the liquid crystal panel and the driving board. The circuit board 116, wherein the light guide plate 112 includes a light incident side on a side surface thereof, the heat sink 114 includes a bottom plate fixed to a lower surface of the back plate 113 and a vertical plate disposed opposite to the light incident side, and the display device further includes a light guide plate 112 a printed circuit board (PCB) 118 disposed opposite to the light incident side and disposed on the vertical plate of the heat sink 114, and a light emitting diode (LED) lamp 117 disposed on a side of the printed circuit board opposite to the light incident surface, the front frame 110 The first bottom edge extending along the display surface of the liquid crystal panel and the second vertical edge perpendicular to the first bottom edge are formed, and an accommodation gap is formed between the vertical plate of the heat sink 114 and the second vertical edge for driving the liquid crystal panel. The driving board 115 is disposed under the bottom plate of the heat sink 114, and realizes connection with the liquid crystal panel 111 through the flexible circuit board 116 disposed in the accommodating gap, wherein the heat sink 114 helps to transmit and emit the LED lamp 117 and the PCB 118 when working. Heat, guaranteed Normal operation of the apparatus 100.

The information disclosed in this section is only technical information related to the present disclosure, and does not constitute a related art of the present disclosure.

Summary of the invention

In a first aspect, an embodiment of the present disclosure provides a backlight module, including: a light guide plate, a back plate, a front frame, an LED lamp, and a PCB, wherein the light guide plate includes a light incident side on a side thereof; The back plate is disposed under the light guide plate, and the length of the back plate is greater than the length of the light guide plate in a direction of the light entrance side toward the LED lamp; the front frame includes a parallel with the back plate And connecting a first bottom edge extending in a direction of the light incident side toward the LED lamp, and connecting the back board and the first side on a side of the first bottom side away from the light incident side a first vertical side of the bottom edge and perpendicular to the back plate and the first bottom edge; the LED lamp is disposed opposite to a light incident side of the light guide plate; the PCB is away from the light incident side Laying over the back panel and electrically connecting with the LED lamp; the first bottom edge, the first vertical edge and the back panel form an accommodating space, and the accommodating space is used for the placement The LED lamp and the PCB.

In a second aspect, the present application provides a liquid crystal display device, including a liquid crystal panel and any of the above backlight modules, wherein the backlight module is disposed opposite to the liquid crystal panel, and the liquid crystal panel is located in the backlight module The upper surface of the group.

DRAWINGS

In order to more clearly illustrate some embodiments of the present disclosure or the technical solutions in the related art, the embodiments or the related art, the drawings to be used in the description will be briefly described below. Obviously, the drawings in the following description It is merely some embodiments of the present disclosure, and not all of the embodiments, and other drawings may be obtained from those skilled in the art without departing from the drawings.

1 is a schematic structural view of a related art backlight module and a liquid crystal display device thereof;

2 is a schematic structural diagram of a backlight module and a liquid crystal display device thereof according to some embodiments of the present disclosure;

3 is a schematic structural view of an LED lamp and a PCB in some embodiments of the present disclosure;

4 is a schematic structural view of a PCB and a back plate fixed by screws according to some embodiments of the present disclosure;

FIG. 5 is a schematic structural diagram of a backlight module and a liquid crystal display device thereof according to other embodiments of the present disclosure.

Detailed ways

The technical solutions in some embodiments of the present disclosure will be described below in detail in conjunction with the accompanying drawings in the embodiments of the present disclosure, and the described embodiments are only a part of the disclosed embodiments, rather than all Example. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the disclosure.

The technical solutions shown in the present application are described in detail below through specific embodiments. It should be noted that the following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in some embodiments.

The liquid crystal display device is more and more popular among consumers because of its small footprint and thin appearance. However, for the convenience of design and assembly, in some module assemblies, the heat sink and the driving board are disposed under the backing plate and superposed to form a convex step structure.

Some embodiments of the present disclosure provide a backlight module 200. The backlight of the backlight module 200 is a side-lit backlight. As shown in FIG. 2, the backlight module 200 includes a light guide plate 210, a back plate 211, a front frame 212, an LED lamp 213, and a PCB 214, wherein the light guide plate 210 includes a light incident side on a side thereof; the back plate 211 is disposed at Below the light guide plate 210, and in the direction of the light incident side toward the LED lamp 213, the length of the back plate 211 is greater than the length of the light guide plate 210; the front frame 212 includes a side parallel to the back plate 211 and toward the LED lamp 213 on the light incident side. a first bottom edge 2121 extending in a direction, and a first side connecting the back plate 211 and the first bottom edge 2111 on a side of the first bottom edge 2121 away from the light incident side and perpendicular to the back plate 211 and the first bottom edge 2121. The LED 213 is disposed opposite to the light incident side of the light guide plate 210; the PCB 214 is disposed above the back plate 211 in a direction away from the light incident side and electrically connected to the LED lamp 213. The PCB 214 is a PCB board of a plastic substrate in some embodiments, and a PCB board of a metal substrate in other embodiments. The first bottom edge 2121, the first vertical side 2122 and the back plate 211 form an accommodating space for arranging the LED lamp 213 and the PCB 214.

At the other three narrow side positions of the light guide plate, the back plate is only slightly larger than the light guide plate, and only the limit of the light guide plate is required.

In some embodiments, since the back plate 211 needs to conduct and dissipate the heat generated when the LED lamp 117 and the PCB 118 operate to perform heat dissipation, the back plate 211 needs to have better thermal conductivity, and the embodiment preferably has better thermal conductivity. The aluminum material is used to make the back plate 211, and the heat conduction function of the back plate 211 is realized while realizing the supporting and fixing action of the back plate 211. The use of the back plate 211 having better thermal conductivity integrates the heat dissipation effect of the heat sink and the support function of the back plate 211 itself, reduces the space occupied by the heat sink in the thickness direction, and achieves thinning of the overall thickness of the display device.

In some embodiments, as shown in FIG. 3, in order to make full use of the accommodating space formed between the first bottom plate 2121, the first vertical side 2122, and the back plate 211, and effectively utilize the heat conduction effect of the back plate 211, the PCB 214 can be used. The shape is designed to be L-shaped, and the L-shaped PCB 214 includes a standing side 2141 connected to the LED lamp 213 and a bottom side 2142 disposed opposite to the backing plate 211. The vertical side 2141 is disposed opposite to the light incident side of the light guide plate 210, and the LED lamp is disposed on a side of the vertical side 2141 facing the light incident side. It should be noted that the vertical side 2141 and the bottom side 2142 of the L-shaped PCB 214 are not strictly right angles and may have errors. In some embodiments, the upside 2141 and the bottom side 2142 may be flat plates or may be formed with some relief structures. In these embodiments, by extending the back plate and the front frame, an accommodating space extending along the surface of the display device is formed, and a PCB that generates more heat and takes up a larger space is disposed in the accommodating space, and is away from The direction of the light entrance side is laid on the surface of the back plate, which ensures the effective contact area between the PCB and the back plate having the heat dissipation effect, thereby further reducing the overall thickness of the display device on the basis of realizing the heat dissipation of the PCB.

When the display device is in operation, the heat generation of the trace layer of the PCB 214 and the heat generation of the LED lamp 213 are the two main sources of heat. In order to dissipate heat more efficiently, and to facilitate mounting and fixing of the LED lamp 213 on the PCB 214, in some embodiments, the wiring layer of the PCB 214 is disposed on the vertical side 2141 of the PCB 214 opposite to the light incident side of the light guide plate 210, and The bottom side 2142 of the PCB 214 opposite the backing plate 211.

Specifically, as shown in FIG. 3, in order to ensure that the display device has sufficient backlight brightness value and the backlight brightness value remains uniform, in some embodiments, the backlight module 200 includes a plurality of LED lights 213, and the plurality of LED lights are uniform. The layout is installed on the vertical side 2141 of the PCB 214. The PCB 214 provides power for the LED lamp 213 and controls the brightness of the LED lamp 213, so that the LED lamp 213 provides a uniform backlight for the display device.

As shown in FIG. 2, the PCB 214 is laid on the backplane 211, in order to balance the fixing of the PCB 214 and ensure the heat generated by the PCB 214 and the LED lamp 213 through the backing plate 211 for heat conduction and heat dissipation. In some embodiments, the PCB 214 can be fixed on the back plate 211 by using the thermal conductive adhesive 215, that is, the thermal conductive adhesive 215 is disposed between the PCB 214 and the back plate 211 to achieve fixation and heat conduction, and the use of the thermal conductive adhesive 215 can be effective. The conduction efficiency of the heat generated by the PCB 214 and the LED lamp 213 is improved to ensure the normal operation of the display device.

In some embodiments, one side of the wiring layer of the PCB 214 is attached to the back plate 211 by a thermal adhesive 215. The side of the bottom side 2142 of the PCB 214 on which the wiring layer is disposed may be attached to the backing plate 211 by a thermal adhesive.

In some embodiments, as shown in FIG. 4, the PCB 214 is laid on the back plate 211 in a fixed manner by means of screws 218. The PCB 214 is fixed on the back plate 211 by screws 218. Although the effect of transferring the heat generated by the PCB 214 to the back plate 211 is inferior to that of fixing through the thermal conductive adhesive, the fixing effect is better, and the PCB 214 is not fixed to the back plate 211. It is easy to move the PCB 214 out of the backplane 211 due to movement or heat, and the normal operation of the PCB 214 is ensured. In some embodiments, the PDB 214 can be simultaneously secured to the backing plate 211 by thermally conductive glue and screws, thereby achieving better heat dissipation and fixation at the same time.

Further, as shown in FIG. 2 and FIG. 4, in some embodiments, the driving board 216 included in the backlight module 200 for driving the liquid crystal panel is also disposed in the accommodating space. Specifically, the driving board 216 may be disposed at Above the PCB 214, not only can the accommodating space be effectively utilized, but also the overall reduction of the display device can be further achieved by transferring the thickness of the driving board 216 superimposed on the thickness of the display device to the accommodating space in the horizontal direction. It is thin and realizes the planar design of the back of the display device.

FIG. 5 is a schematic structural view of a backlight module and a liquid crystal display device thereof in other embodiments of the present disclosure. The embodiment shown in FIG. 5 is substantially the same as the embodiment shown in FIG. 4, except that in the embodiment shown in FIG. 5, the driving board 216 is disposed above the back board 211 in parallel with the PCB 214. In the embodiment shown in FIG. 4, the PCB 214 is disposed above the backplane 211, which in turn is disposed over the PCB 214. In the embodiment shown in FIG. 5, the PCB 214 and the back plate 211 are fixed by screws 218, but the disclosure is not limited thereto. In other embodiments, the PCB 214 may be attached to the back plate by a thermal adhesive. 211.

Some embodiments of the present disclosure provide a backlight module and a liquid crystal display device, wherein the backlight module includes a light guide plate, a back plate, a front frame, an LED lamp, and a PCB, and the light guide plate includes a light incident side on a side thereof. The back plate is disposed under the light guide plate, and the length of the back plate is greater than the length of the light guide plate in the direction of the light incident side toward the LED lamp, and the front frame includes a parallel to the back plate and is oriented on the light incident side a first bottom edge extending in a direction of the LED lamp, and a side of the first bottom edge away from the light incident side connecting the back plate and the first bottom edge and the back plate and the first bottom The first vertical side of the vertical side, the LED light is opposite to the light incident side of the light guide plate, and the PCB is laid above the back plate in a direction away from the light incident side and electrically connected with the LED light, the first bottom edge, the first The vertical side and the back plate form an accommodating space for arranging the LED lamp and the PCB. In a backlight module provided by some embodiments of the present disclosure, heat conduction and dissipation are implemented by using a back plate having better thermal conductivity, and the back plate integrates a dual function of a heat dissipation function and a support positioning function, so that the overall thickness of the display device is reduced; By extending the back plate and the front frame, forming an accommodating space extending along the surface of the display device, and placing a PCB with a large amount of heat and occupying a large space in the accommodating space, and moving away from the light entering side Laying on the surface of the backplane ensures an effective contact area between the PCB and the backplane having a heat dissipation effect, thereby further reducing the overall thickness of the display device on the basis of achieving heat dissipation of the PCB.

Some embodiments of the present disclosure also provide a liquid crystal display device including a liquid crystal panel 217 and the backlight module 200 described in the above embodiments. The backlight module 200 is disposed opposite to the liquid crystal panel 217, and the liquid crystal panel 217 is located on the upper surface of the backlight module 200. The structure, functions, and functions of the backlight module 200 have been described in detail in the foregoing embodiments, and are not described herein again.

The above detailed description of the embodiments of the present invention has been described in detail, the embodiments of the present invention Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the embodiments of the present disclosure are intended to be included within the scope of the present disclosure.

Claims

A backlight module comprising:

a light guide plate comprising a light incident side on a side thereof;

a light-emitting diode LED lamp, the LED light being disposed opposite to the light-incident side of the light guide plate;

a back plate disposed under the light guide plate, and a length of the back plate is greater than a length of the light guide plate in a direction of the light incident side toward the LED lamp;

a front frame, the front frame including a first bottom edge extending parallel to the back plate and extending in a direction of the light incident side toward the LED lamp, and a distance from the light entering the first bottom edge a side of the side connecting the back panel and the first vertical side of the first bottom edge;

a printed circuit board PCB, the PCB is laid above the backplane in a direction away from the light incident side and electrically connected to the LED lamp;

The first bottom edge, the first vertical side and the back plate form an accommodating space for placing the LED lamp and the PCB.
The backlight module of claim 1 , wherein the back plate is made of aluminum.
The backlight module of claim 1, wherein the PCB has an L-shape, and includes a vertical side electrically connected to the LED lamp and a bottom side disposed above the back plate.
The backlight module of claim 1, wherein the wiring layer of the PCB is disposed on a side of the PCB opposite to the backplane. The laser projector according to claim 3, wherein said at least one transmission region comprises two centrally symmetric transmission regions, and at least one of said fluorescent regions comprises two centrally symmetric fluorescent regions.
The backlight module of claim 3, wherein the plurality of LED lamps are plural and evenly mounted on the vertical side of the PCB.
The backlight module of claim 3, wherein a side of the bottom side of the PCB on which the wiring layer is disposed is attached to the backing plate by a thermal adhesive.
The backlight module as claimed in claim 1 , wherein a thermal conductive adhesive is disposed between the PCB and the back plate.
The backlight module of claim 1, wherein one side of the PCB on which the wiring layer is disposed is attached to the back plate by a thermal adhesive.
The backlight module of claim 1, wherein the PCB is screwed to the backplane.
The backlight module of claim 1, further comprising a driving board for driving the liquid crystal panel and disposed in the accommodating space.
The backlight module of claim 10, wherein the driving board is disposed above the PCB.
The backlight module of claim 10, wherein the driving board is disposed above the backing plate in parallel with the PCB.
A liquid crystal display device comprising a liquid crystal panel and the backlight module of claim 1 , wherein the backlight module is disposed opposite to the liquid crystal panel, and the liquid crystal panel is located on an upper surface of the backlight module .