CN219302830U - Backlight module and display device - Google Patents

Abstract

The utility model relates to the technical field of display and discloses a backlight module and a display device, wherein the backlight module comprises a back plate, and a reflecting sheet, a light guide plate, an optical film, a lamp strip and a radiating unit which are sequentially arranged in a containing space of the back plate; the heat dissipation unit is positioned in the through hole of the side plate of the backboard and is contacted with the heat conduction pad. According to the backlight module and the display device, the heat radiating unit is arranged on the inner wall of the limiting plate of the middle frame, or the heat radiating unit is arranged on the heat radiating piece, or the heat radiating unit is directly arranged on the back of the light source assembly and is contacted with the heat conducting bonding pad of the light source assembly, so that heat is directly led out from the light source generating heat, and the heat radiating performance of the backlight module and the display device is improved.

Description

Backlight module and display device

Technical Field

The present utility model relates to the field of display technologies, and in particular, to a backlight module and a display device.

Background

The display device consists of a display panel and a backlight module, and the display panel can not emit light and can only display pictures by means of light rays emitted by the backlight module arranged below the display panel, so that the design of the backlight module in the display device is also important.

The light bar in the backlight module is provided with a plurality of light sources for providing light for the display panel, and for vehicle-mounted models, the light bar is required to be provided with a plurality of light sources, and the driving current is also higher, so that the temperature of the backlight module is higher, and a new backlight module and a display device are required to be designed to solve the problem of high temperature of the backlight module in the prior art.

Disclosure of Invention

In view of the above, the embodiment of the utility model provides a backlight module and a display device, which are used for solving the problem of high temperature of the existing backlight module.

The embodiment of the utility model provides a backlight module, which comprises a back plate, and a reflecting sheet, a light guide plate and an optical film which are sequentially arranged in a containing space of the back plate, wherein the backlight module comprises:

the lamp strip comprises a plurality of light source assemblies, wherein each light source assembly comprises a substrate, a heat conducting layer, an insulating layer, an electrode layer and a light source, and the heat conducting layer comprises a heat conducting bonding pad;

and the heat radiating unit is positioned in the through hole of the side plate of the backboard and is contacted with the heat conducting bonding pad.

Further, the electrode layer comprises a first electrode and a second electrode, one end of the light source is welded on the first electrode, and the other end of the light source is welded on the second electrode.

Further, the heat dissipation unit is a bump or a shutter structure.

Further, the heat dissipation unit is matched with the size of the through hole.

Further, the backlight module further comprises a middle frame, the middle frame comprises a top plate and a limiting plate, the top plate is vertically connected with the limiting plate, and the position, opposite to the through hole of the side plate, of the limiting plate is provided with the heat radiating unit.

Further, a reflective layer is provided on the inner side of the top plate.

Further, the backlight module further comprises a heat dissipation piece, the heat dissipation piece is arranged on the outer side of the back plate, the heat dissipation piece comprises a bottom plate and a side plate, the bottom plate is vertically connected with the side plate, and the heat dissipation unit is arranged on the inner side of the side plate.

Further, the heat dissipation unit is disposed at the back of the light source assembly.

Further, the light source is an LED.

The embodiment of the utility model also discloses a display device which comprises a display panel and a backlight module with the characteristics.

In summary, in the backlight module and the display device provided by the embodiments of the present utility model, the heat dissipation unit is disposed on the inner wall of the limiting plate of the middle frame, or the heat dissipation unit is disposed on the heat dissipation member, or the heat dissipation unit is directly disposed on the back of the light source assembly, and is in contact with the heat conduction pad of the light source assembly, so that heat is directly conducted out from the light source generating heat, thereby improving the heat dissipation performance of the backlight module and the display device.

The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.

Drawings

FIG. 1 is a front view of a single light source assembly of a light bar provided by an embodiment of the present utility model;

FIG. 2 is a rear view of a single light source assembly of a light bar according to an embodiment of the present utility model;

FIG. 3 is a side view of a single light source assembly of a light bar provided by an embodiment of the present utility model;

FIG. 4 is a cross-sectional view of a display device according to a first embodiment of the present utility model;

fig. 5 is a cross-sectional view of a display device according to a second embodiment of the utility model;

fig. 6 is a cross-sectional view of a display device according to a third embodiment of the present utility model;

fig. 7 is a cross-sectional view of a display device according to a fourth embodiment of the present utility model;

fig. 8 is a cross-sectional view of a display device according to a fifth embodiment of the present utility model;

FIG. 9 is an enlarged view of a portion of the light source assembly of FIG. 8;

fig. 10 is a partial enlarged view of another embodiment of the light source assembly of fig. 8.

Reference numerals illustrate:

5, a light source assembly; 50, a circuit board; 51, a light source; 52, a first electrode; 53, a second electrode; 54, a thermally conductive pad; 55, a heat sink; 551, a bottom plate; 552, side panels; 630/553/554/56/57, a heat dissipating unit;

100, a display device; 10, a backboard; 11, side plates; 20, a reflecting sheet; 30, a light guide plate; 40, an optical film; 60, a middle frame; 61, a top plate; 62, limiting plates; 620, bumps; 70, a display panel; 80, shading adhesive tape; 90, adhesive tape; 91, a printed circuit board.

Detailed Description

In order to further describe the technical means and effects adopted by the present utility model for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present utility model with reference to the accompanying drawings and preferred embodiments.

The embodiment of the utility model provides a backlight module and a display device, wherein the display device comprises the backlight module and a display panel, the backlight module is arranged below the display panel, and the display panel is a liquid crystal display panel and comprises an array substrate, a color filter substrate and a liquid crystal layer which is clamped between the array substrate and the color filter substrate. Because the liquid crystal display panel cannot emit light, the backlight module arranged below the liquid crystal display panel is required to emit light to perform normal display.

Embodiment one:

in the embodiment of the utility model, a plurality of light source assemblies are arranged on the light bar, and referring to fig. 1 to 3, fig. 1 to 3 illustrate a single light source assembly as an example, the light source assembly 5 includes a substrate 50, a heat conducting layer, an insulating layer, an electrode layer and a light source 51; specifically, the light source 51 is a light emitting diode (Light Emitting Diode, LED); the electrode layer comprises a first electrode 52 and a second electrode 53, the first electrode 52 and the second electrode 53 are arranged at intervals in an insulating way, one of the first electrode 52 and the second electrode 53 is an anode, the other is a cathode, one end of the light source 51 is welded on the first electrode 52, and the other end is welded on the second electrode 53; the heat conducting layer comprises a heat conducting pad 54 arranged between the vertical projections of the first electrode 52 and the second electrode 53, and an insulating layer is further arranged between the heat conducting layer and the electrode layer for isolating the heat conducting layer and the electrode layer.

The light source component provided by the utility model adopts the thermoelectric separation principle of the LED; the heat refers to the heat conduction pad 54 in the light source assembly 5, and the electricity refers to the electrode layer on the light source assembly 5, and the heat conduction pad 54 is arranged on different layers of the circuit board 50 and separated by an insulating layer, and the heat conduction pad 54 is used for conducting heat and is directly arranged on the light source assembly 5, so that the best heat dissipation effect can be achieved. In the light source assembly 5 according to the embodiment of the present utility model, the first electrode 52 and the second electrode 53 are connected to the circuit of the substrate 50, and the heat conductive pad 54 is connected to the heat conductive unit in the substrate 50. The substrate is preferably a flexible circuit board, an aluminum substrate, a printed circuit board and other materials; the heat conductive layer is preferably a material having good heat dissipation properties such as copper and graphite. As shown in fig. 3, the heat conductive pad 54 is provided to protrude from the substrate 50, that is, the heat conductive pad 54 extends to the rear surface of the substrate 50, so that the heat conductive area can be further increased.

Fig. 4 is a cross-sectional view of a display device according to a first embodiment of the present utility model, as shown in fig. 4, a display device 100 provided by the embodiment of the present utility model includes a backlight module and a display panel 70 disposed above the backlight module, the backlight module includes a back plate 10, a reflective sheet 20, a light guide plate 30 and an optical film 40, wherein the back plate 10 includes a bottom plate and side plates 11 surrounding the bottom plate, the bottom plate and the side plates 11 form a receiving space, and the reflective sheet 50, the light guide plate 30 and the optical film 40 are sequentially disposed in the receiving space.

Further, a light bar is further disposed at one side in the accommodating space, the light bar includes a plurality of light source assemblies 5, the light emitting surface of the light source 51 of the light source assemblies 5 faces the light incident side 31 of the light guide plate 30, the light source assemblies 5 are side-incident light sources, when the light emitted by the light source 51 of the light source assemblies 5 enters the light guide plate 30 from the light incident side 31 of the light guide plate 30, the light enters from the light incident side 31 of the light guide plate 30 and then exits from the light emergent side 32 to finally enter the display panel 70, so that the display panel 70 displays images. The light guide plate 30 functions to convert incident light from a line light source into a surface light source. It should be noted here that the lower surface of the light guide plate 30 is provided with a plurality of dots (not shown in fig. 4).

Further, the reflective sheet 20 is disposed on the bottom plate of the back plate 10, and is used for reflecting the light entering the light guide plate 30 and entering the reflective sheet 20 from the lower part of the light guide plate 30 back to the light guide plate 30, thereby increasing the light utilization rate.

Further, the optical film 40 is disposed above the light guide plate 30, and preferably, the optical film 40 may be a multi-layer film, such as a prism film, a brightness enhancing film, and a diffusion film, which may be disposed according to specific products, but not limited thereto.

Further, the backlight module further includes a middle frame 60, the middle frame 60 is disposed at an outer side of the side plate 11 of the back plate 10, specifically, the middle frame 60 includes a top plate 61 and a limiting plate 62, the top plate 61 and the limiting plate 62 are vertically connected, the top plate 61 is disposed above the light bar, and a reflective layer is disposed at an inner side of the top plate 61 for preventing light of the light source 51 from leaking from the top. The upper side of the top plate 61 provides a supporting platform for the display panel 70, and the display panel 70 is attached to the top plate 61 by the adhesive tape 90. The limiting plate 62 of the middle frame 60 is disposed adjacent to the side plate 11 of the back plate. In this embodiment, a heat conducting pad 54 extends from one side of the light source 51 facing away from the light guide plate 30, through holes are formed in the opposite positions of the side plate 11 and the heat conducting pad 54, a heat dissipating unit 620 is disposed in the opposite position of the limiting plate 62 of the middle frame 60 and the through holes of the side plate 11, that is, the heat dissipating unit 620 contacts with the heat conducting pad 54 of the light source assembly 5 through the through holes, and the sizes of the heat dissipating unit 620 and the through holes are matched. Further, the heat dissipation unit 620 is preferably a bump made of copper or graphite, and the bump may be adhered to the inner side of the limiting plate 62 of the middle frame 60 by welding or heat dissipation glue, and the middle frame 60 is made of a metal material, so that the heat of the light source assembly 5 is dissipated by the middle frame 60, and the heat dissipation effect of the backlight module is increased.

Further, in the embodiment of the present utility model, a printed circuit board 91 is further disposed below the reflective sheet 20, and the printed circuit board 91 is used for connecting with the circuit of the light bar, typically, a flexible circuit board is disposed between the printed circuit board 91 and the light bar, and the flexible circuit board connects the printed circuit board 91 and the light bar, where the printed circuit board 91 is folded back on the back plate 10, and in other embodiments, the printed circuit board 91 may be fixed on the lug of the back plate and disposed on the same side as the side plate of the back plate.

Embodiment two:

fig. 5 is a cross-sectional view of a display device according to a second embodiment of the present utility model, as shown in fig. 5, the difference between the second embodiment and the first embodiment is that the heat dissipation unit 630 disposed on the limiting plate 62 of the middle frame 60 is a shutter structure, one end of the shutter structure is fixed on the middle frame 60, and the other end of the shutter structure passes through the through hole of the side plate 11 to contact with the heat conducting pad 54 of the light source assembly 5, so that the backlight module has a better heat conducting effect.

The rest of the second embodiment of the present utility model is the same as the first embodiment of the present utility model, and will not be described here again.

Embodiment III:

fig. 6 is a cross-sectional view of a display device according to a third embodiment of the present utility model, please refer to fig. 6, in which the heat dissipation unit is not disposed on the middle frame 60, and in the third embodiment, a heat dissipation member 55 is disposed between the limiting plate 62 of the middle frame 60 and the side plate 11 of the back plate 10, that is, the heat dissipation member 55 is disposed on the outer side of the back plate, and the middle frame 60 is disposed on the outer side of the heat dissipation member 55. The heat sink 55 includes a bottom plate 551 and a side plate 552, the bottom plate 551 and the side plate 552 are connected perpendicular to each other, a heat dissipating unit 553 is disposed at the inner side of the side plate 552, the heat dissipating unit 553 is located in a through hole of the side plate 11, and the through hole corresponds to the heat conducting pad 54 of the light source assembly 5. The bottom plate 551 of the heat sink 55 is closely attached to the bottom plate of the back plate 10, and heat can be conducted to the back plate 10 through the heat sink 55. Preferably, the heat dissipating unit 553 is a bump made of copper or graphite, the bump may be adhered to the inner side of the side plate 552 of the heat dissipating member 55 by welding or heat dissipating glue, the heat dissipating member 55 is made of a metal material, and the heat dissipating member 55 may dissipate heat of the light source assembly 5 from the heat dissipating member 55, so as to further increase the heat dissipating effect of the backlight module.

The rest of the third embodiment of the present utility model, which is the same as the first embodiment, will not be described here.

Embodiment four:

fig. 7 is a cross-sectional view of a display device according to a fourth embodiment of the present utility model, please refer to fig. 7, in which the heat dissipation unit 554 disposed inside the side plate 552 is a louver structure, one end of the louver structure is fixed on the side plate 552, and the other end of the louver structure passes through the through hole of the side plate 11 to contact with the heat conduction pad 54 of the light source assembly 5, so that the backlight module has better heat conduction effect.

The remaining parts of the fourth embodiment of the present utility model that are identical to the three embodiments are not described here.

Fifth embodiment:

fig. 8 is a cross-sectional view of a display device provided in a fifth embodiment of the present utility model, please refer to fig. 8, in which the heat dissipating unit 56 is directly disposed at the back of the light source assembly 5 and is disposed in contact with the heat conducting pad of the light source assembly 5, the heat dissipating unit 56 is disposed in the through hole of the side plate 11, and the limiting member 62 of the middle frame 60 is disposed in close contact with the side plate 11.

Fig. 9 is a partial enlarged view of the light source assembly in fig. 8, please refer to fig. 9, the heat dissipating unit 56 is a bump made of copper or graphite, the bump can be adhered to the back surface of the light source assembly 5 by welding or heat dissipating glue, and the heat dissipating unit 56 can conduct heat to the back plate 10 due to the back plate being a sheet metal part, so as to achieve the heat dissipating effect of the backlight module. Fig. 10 is a partial enlarged view of another embodiment of the light source assembly in fig. 8, referring to fig. 10, the heat dissipation unit 57 may also be a shutter structure, one end of the shutter structure is fixed on the back surface of the light source assembly 5, and the back plate is a sheet metal part, so that the heat dissipation unit 57 can conduct heat to the back plate 10, thereby achieving the heat dissipation effect of the backlight module.

According to the backlight module and the display device provided by the embodiment of the utility model, the heat radiating unit is arranged on the inner wall of the limiting plate of the middle frame, or the heat radiating unit is arranged on the heat radiating piece, or the heat radiating unit is directly arranged on the back of the light source assembly and is contacted with the heat conducting bonding pad of the light source assembly, so that heat is directly led out from the light source generating heat, and the heat radiating performance of the backlight module and the display device is improved.

The present utility model is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present utility model.

Claims (10)

1. The utility model provides a backlight unit, includes backplate and is located reflector plate, light guide plate and the optics diaphragm that the accommodation space of backplate set gradually, its characterized in that, backlight unit includes:

the lamp strip comprises a plurality of light source assemblies, wherein each light source assembly comprises a substrate, a heat conducting layer, an insulating layer, an electrode layer and a light source, and the heat conducting layer comprises a heat conducting bonding pad;

and the heat radiating unit is positioned in the through hole of the side plate of the backboard and is contacted with the heat conducting bonding pad.

2. The backlight module according to claim 1, wherein the electrode layer comprises a first electrode and a second electrode, one end of the light source is welded to the first electrode, and the other end of the light source is welded to the second electrode.

3. The backlight module according to claim 1, wherein the heat dissipation unit is a bump or a louver structure.

4. The backlight module according to claim 1, wherein the heat dissipation unit is matched with the size of the through hole.

5. The backlight module according to claim 4, further comprising a middle frame, wherein the middle frame comprises a top plate and a limiting plate, the top plate is vertically connected with the limiting plate, and the limiting plate is opposite to the through hole of the side plate, and the heat dissipation unit is arranged at the position opposite to the through hole of the side plate.

6. The backlight module according to claim 5, wherein the inner side of the top plate is provided with a reflective layer.

7. The backlight module according to claim 4, further comprising a heat sink disposed outside the back plate, the heat sink comprising a bottom plate and a side plate, the bottom plate and the side plate being vertically connected, the heat sink being disposed inside the side plate.

8. The backlight module according to claim 4, wherein the heat dissipation unit is disposed at a back of the light source assembly.

9. The backlight module of claim 1, wherein the light source is an LED.

10. A display device comprising a display panel and a backlight module according to any one of claims 1-9.

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