WO2018176636A1

WO2018176636A1 - Backlight module, display device, and unmanned aerial vehicle system

Info

Publication number: WO2018176636A1
Application number: PCT/CN2017/088341
Authority: WO
Inventors: 黄彦鑫; 黄华; 唐尹
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2017-04-01
Filing date: 2017-06-14
Publication date: 2018-10-04
Also published as: CN109690187A; CN206819010U

Abstract

A backlight module (10), comprising: at least one light source (11) provided at one partial light entrance surface side of the backlight module (10); a circuit board (13) electrically connected to the at least one light source (11) and used for fixing the light source (11) and supplying power for the light source (11); and at least one first heat pipe (12) provided at one side of the circuit board (13) and extending along the direction where the light source (11) is provided. An evaporating end (121) of the first heat pipe (12) is provided corresponding to the light source (11), and a condensing end (122) of the first heat pipe (12) extends to the other partial light entrance surface side of the backlight module (10) where the light source (11) is not provided so as to transport the heat of the light source (11) to the condensing end (122) of the first heat pipe (12) for heat radiating. According to the structure, by means of the heat conduction capability of the heat pipe, the heat of the light source (11) on the backlight module (10) is conducted to the part of the backlight module (10) where the light source (11) is not provided for heat radiating so as to improve the heat-radiating efficiency of the backlight module (10). Also provided are a display device and an unmanned aerial vehicle system.

Description

Backlight module, display device and drone system

Technical field

The present invention relates to the field of backlight modules, and in particular, to a backlight module, a display device, and a drone system.

Background technique

With the development of display technology, flat panel displays (FPD) developed by optoelectronic technology and semiconductor manufacturing technology, such as liquid crystal display (LCD), organic electro-luminescence display (Organic Electro-Luminescent, OLEDs and Plasma Display Panels (PDPs) have gradually become mainstream products. In the case of a liquid crystal display, the display panel does not emit light by itself, and a backlight module is needed to provide a uniform surface light source for the display panel to achieve a display effect. The backlight module is provided with a light source, and the light source is disposed through the light guide plate. The divergent light converts the flat light required by the display panel.

As the user's display quality requirements for the display become higher and higher, and in order to clearly see the display screen in the outdoor sunlight, it is necessary to increase the brightness of the planar light output by the backlight module of the display, correspondingly, it is necessary to increase The number of light sources of the backlight module, and the increase in the number of light sources causes the heat of the backlight module to increase, and the backlight module is overheated. The overheated backlight module may be damaged by the components inside the backlight module on the one hand, and may affect the user's use due to excessive temperature on the other hand. At present, the graphite heat sink is usually used to dissipate heat from the backlight module, but the graphite heat sink can only function as a soaking heat, and the heat sink can not be well cooled.

Summary of the invention

Embodiments of the present invention provide a backlight module, a display device, and a drone system to solve the technical problem of excessive temperature of the backlight module.

In order to solve the above technical problem, a technical solution adopted by the embodiment of the present invention is to provide a backlight module, including at least one light source, disposed on a part of the light incident surface side of the backlight module;

a circuit board electrically connected to the at least one light source for fixing the light source and providing power to the light source;

The at least one first heat pipe is disposed on one side of the circuit board and extends along a direction in which the light source is disposed. The evaporation end of the first heat pipe is disposed corresponding to the light source, and the condensation end extends to the backlight module. Another portion of the light source enters the light side to transfer heat from the light source to the condensation end of the first heat pipe for heat dissipation.

The backlight module further includes a heat conducting component disposed between the circuit board and the first heat pipe;

The heat conducting component comprises a thermal conductive adhesive and a metal plate;

The thermal conductive adhesive is used to adhere the circuit board to the metal plate;

The metal plate is connected to the first heat pipe for conducting heat of the light source to the first heat pipe for heat dissipation.

Wherein, the metal plate is a reinforcing metal plate.

Wherein, the backlight module is a side-entry backlight module;

The at least one light source is disposed on two first direction sides and a second direction side of the backlight module, and the metal plate is disposed on a bottom surface side of the backlight module;

The number of the first heat pipes is two, and the two first heat pipes are a bending mechanism including a first direction portion and a second direction portion; the first direction portion is disposed at the first of the backlight module On the metal plate corresponding to the direction side, the second direction portion is disposed on the metal plate corresponding to the second direction side of the backlight module, and the condensation end of the two first heat pipes extends to the The other second direction side of the backlight module is not provided with a light source.

In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is: A display device is provided, the display device comprising:

a frame, a display panel, a driving circuit board, a heat dissipating component, and a backlight module;

The display panel, the driving circuit board, the heat dissipating component, and the backlight module are all disposed in the frame, the backlight module is disposed on a light incident side of the display panel, and the driving circuit board and the display panel Electrically connecting to the backlight module; wherein

The backlight module is the backlight module provided in the above solution, and the heat dissipation component is disposed corresponding to the condensation end of the first heat pipe for dissipating heat to the backlight module; and/or

The display device includes a second heat pipe disposed on one side of the driving circuit board, and a condensation end of the second heat pipe corresponds to the heat dissipating component for transmitting heat of the driving circuit board to the heat dissipating component Cool down.

Wherein the heat dissipation component comprises a first heat sink;

The evaporation end of the second heat pipe is disposed on the driving circuit board, and the condensation end extends to the first heat sink.

Wherein the display device further includes a second heat sink;

The condensation end of the first heat pipe extends to the second heat sink.

Wherein, the display device further includes a fan, and the fan is disposed between the first heat sink and the second heat sink.

The fan is a turbo fan; the first heat sink and the second heat sink are respectively disposed at an air inlet and an air outlet of the fan.

The first heat sink and the second heat sink are sealed to move air along an extending direction of the first heat sink and the second heat sink.

In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is to provide an unmanned aerial vehicle system including a drone and a drone control terminal, wherein the unmanned The machine control terminal includes the display device provided in the above technical solution.

The backlight module, the display device, and the unmanned aerial vehicle system provided by the embodiment of the present invention, the backlight module has at least one first heat pipe disposed on one side of the circuit board, and Extending the first heat pipe along the direction in which the light source is disposed, and steaming the first heat pipe The emitting end is disposed corresponding to the light source, and the condensation end extends to another side of the light incident surface of the backlight module where the light source is not disposed. The heat of the light source of the backlight module is transmitted to the portion of the backlight module where the light source is not disposed, and the heat is dissipated through the condensation end of the first heat pipe, thereby effectively improving the heat dissipation efficiency of the backlight module.

DRAWINGS

1 is a front view of a first embodiment of a backlight module of the present invention;

2 is a schematic view showing the back structure of the backlight module shown in FIG. 1;

Figure 3 is a cross-sectional view taken along line A-A of the backlight module shown in Figure 2;

Figure 4 is an enlarged schematic view of a portion B of Figure 3;

Figure 5 is a schematic rear view showing the structure of an embodiment of the display device of the present invention;

6 is a schematic structural view of a heat dissipating component and a driving circuit board in the display device shown in FIG. 5;

Fig. 7 is a schematic view showing the structure of the back surface of the display device according to an embodiment of the present invention.

Specific embodiment

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

1 and FIG. 2, FIG. 1 is a front structural view of a first embodiment of a backlight module of the present invention, and FIG. 2 is a schematic rear view of the backlight module of FIG. In this embodiment, the backlight module 10 is a side-lit backlight module. In other embodiments, the backlight module 10 can also be a direct-lit backlight module. As shown in FIG. 1 , for the side-lit backlight module, the light incident surface is at least one side of the light guide plate in the backlight module 10 , so that the backlight module 10 is vertical. The two sides in the direction of the direction are the two first direction sides 101, and the two sides in the lateral direction are the two second direction sides 102. In this embodiment, the plurality of light sources 11 of the backlight module are disposed on the two first direction sides 101 and one second direction side 102 of the light guide plate. A circuit board (not shown) is electrically coupled to at least one of the light sources 11 for fixing the light source 11 and providing power to the light source 11. In this embodiment, the light source 11 is an LED light source, and the circuit board is a flexible circuit board. It can be understood that in other embodiments, the light source 11 can also be other types of point light sources, and the circuit board can also be a PCB board.

As shown in FIG. 2, a first heat pipe 12 is disposed on the back surface of the backlight module 10. The first heat pipe 12 is disposed on one side of the circuit board, and the other side of the circuit board is used to fix the light source 11. In this embodiment, the number of the first heat pipes 12 is two, and the two first heat pipes 12 extend along the direction in which the light source 11 is disposed, and correspond to the set position of the light source 11. That is, the two first heat pipes 12 are a bending mechanism including a first direction portion and a second direction portion, wherein the first direction portion corresponds to the first direction side 101 of the backlight module 10, and the second direction portion corresponds to The second direction side 102 of the backlight module 10. The evaporation ends 121 of the two first heat pipes 12 are disposed on the second direction side 102 of the backlight module 10 having the light source 11, and the condensation end 122 extends to the other second direction side 102 of the backlight module 10 where the light source 11 is not disposed. The evaporation end 121 of the two first heat pipes 12 and the pipe wall respectively absorb the heat of the light source 11 conducted by the circuit board, and respectively transmit the absorbed heat to the condensation end 122 of the two first heat pipes 12, the first heat pipe 12 The condensing end 122 then releases the absorbed heat outward. The direction of conduction of heat in the two first heat pipes 12 is shown by the straight line with arrows in FIG.

It can be understood that the present invention does not limit the number of the first heat pipes and the specific arrangement position of the light source. In other embodiments of the present invention, the number of the first heat pipes can be set according to actual needs, and only one a heat pipe may also have three or more first heat pipes; the light source may also be disposed on either one of the two first direction sides and the two second direction sides, or the light source may be disposed at Part of the first direction side or Part of the second direction side. Wherein, the first heat pipe and the light source need to meet the arrangement of the first heat pipe along the light source, so that the first heat pipe can effectively absorb the heat conducted by the light source through the circuit board through the evaporation end and the pipe wall.

The light source of the embodiment is disposed on three sides of the backlight module, which can improve the illumination brightness of the backlight module, and absorb the heat of the light source from the circuit board of the fixed light source by using the evaporation end of the first heat pipe and the wall of the first heat pipe. And transferring the absorbed heat to the condensation end of the first heat pipe, and dissipating the heat of the light source of the backlight module through the heat dissipation action of the condensation end of the first heat pipe, thereby realizing the brightness of the backlight module while enhancing Improve the heat dissipation efficiency of the backlight module.

Further, the present invention further provides a second embodiment of the backlight module. The backlight module of the present embodiment further includes a circuit board and a first embodiment based on the first embodiment of the backlight module shown in FIG. 1 and FIG. A heat transfer component between the heat pipes. The front structure and the back structure of the backlight module of the present embodiment are respectively the front structure of the first embodiment of the backlight module shown in FIGS. 1 and 2, because the heat conducting component is disposed between the circuit board and the first heat pipe. The schematic is the same as the schematic of the back structure. 3 and FIG. 4, FIG. 3 is a cross-sectional view of the present embodiment taken along line A-A of FIG. 2, and FIG. 4 is an enlarged schematic view of a portion B of FIG. As shown in FIG. 3 and FIG. 4 , the heat conducting component of the backlight module 20 of the embodiment includes a thermal conductive adhesive 14 and a metal plate 15 . The thermal conductive adhesive 14 is used to attach the circuit board 13 to the metal plate 15; the metal plate 15 is connected to the first heat pipe 12 for conducting heat of the light source 11 to the first heat pipe 12 for heat dissipation.

At this time, the first direction portion of the first heat pipe 12 is disposed on the corresponding metal plate 15 on the first direction side of the backlight module, and the second direction portion of the first heat pipe 12 is disposed on the second direction side of the backlight module. On the metal plate 15.

In this embodiment, the heat conduction glue and the metal plate in the heat conduction component can quickly transfer the heat of the light source to the heat pipe, thereby further improving the heat dissipation efficiency of the backlight module.

In this embodiment, the metal plate is a reinforcing metal plate, which can support and fix the backlight module while conducting heat. The reinforcing metal plate may be a metal plate having a good electrical conductivity and a certain hardness such as a reinforcing aluminum plate or a reinforcing copper plate.

Further, the present invention also provides a display device. Referring to FIG. 5, FIG. 5 is a schematic view showing the structure of the back surface of an embodiment of the display device of the present invention. As shown in FIG. 5 , the display device includes a display panel 20 , a driving circuit board (not shown), a heat dissipation component 40 , and a backlight module 50 ; the display panel 20 , the driving circuit board , the heat dissipation component 40 , and the backlight module 50 . The backlight module 50 is disposed on the light incident side of the display panel 20, and the backlight module 50 provides parallel light to the display panel 20. The driving circuit board is electrically connected to the display panel 20 and the backlight module 50 for display. Panel 20 and backlight module 50 provide drive signals.

In this embodiment, the backlight module may be the backlight module in any of the embodiments shown in FIG. 1 to FIG. In other embodiments, the backlight module can also be other types of backlight modules in the prior art. In addition, the display device of this embodiment further includes a second heat pipe disposed on one side of the driving circuit board, and the condensation end of the second heat pipe corresponds to the heat dissipating component for transmitting heat of the driving circuit board to the heat dissipating component for heat dissipation. When the backlight module in the display device of the embodiment is the backlight module in any of the embodiments shown in FIG. 1 to FIG. 4, and the second heat pipe is disposed, the backlight module and the driving circuit board can be simultaneously performed. The heat dissipation can further improve the heat dissipation efficiency of the display device.

It can be understood that in other embodiments of the display device of the present invention, there may be no second heat pipe, that is, in other embodiments of the display device, the heat of the driving circuit board is not conducted to the heat dissipating component, only through the first heat pipe The heat of the light source is conducted to the heat dissipating component for heat dissipation.

As shown in FIG. 5 and FIG. 6, the heat dissipation assembly 40 of the present embodiment includes a first heat sink 41, a second heat sink 42, and a fan 43. The evaporation end of the second heat pipe 31 is disposed on the driving circuit board 30, and the condensation end extends to the first heat sink 41. The condensation end of one of the two first heat pipes 12 extends to the second fin 42 and the condensation end of the other first heat pipe 12 extends to the first fin 41. The fan 43 is disposed between the first fins 41 and the second fins 42. The structural schematic diagram of the second heat pipe 31, the driving circuit board 30 and the heat dissipating component 40 in this embodiment is as shown in FIG. 6. In other embodiments, the heat dissipation component 40 may include only the first heat sink 41 or the second heat sink 42; or, the heat dissipation component 40 may include the first heat sink 41 or the second heat sink 42, but does not include the fan 43; Alternatively, the heat dissipation assembly 40 includes a first heat sink 41 or a second heat sink 42 and includes a fan 43. When cooling When the assembly 40 includes the first fins 41 or the second fins 42, the condensation end of the two first heat pipes 12 and the condensation end of the second heat pipe 31 both extend to the first fins 41 or the second fins 42. The driving circuit board in this embodiment is a PCB board, and may also be a flexible circuit board.

Further, the fan 43 in this embodiment is a turbo fan. Since the direction of the airflow caused by the turbo fan is perpendicular to the direction of the rotating shaft, the first fin 41 and the second fin 42 are respectively disposed at the air inlet and the air outlet of the fan 43, so that the airflow direction caused by the turbo fan 43 follows The first fins 41 and the second fins 42 on both sides of the turbo fan 43 extend to further dissipate heat transferred to the first fins 41 and the second fins 42 by the turbo fan 43.

Referring to FIG. 7, the display device of this embodiment further includes a frame 60. As shown in FIG. 7, the display panel of the display device (not shown), the second heat pipe 31, and the driving circuit board (not shown) The heat dissipating component 40 and the backlight module (not shown) are disposed in the housing 60. The air inlet 61 and the air outlet 62 corresponding to the first heat sink 41 and the second heat sink 42 are disposed on the frame 60. In this embodiment, the air inlet 61 on the frame 60 corresponds to the first heat sink 41. The tuyere 62 corresponds to the second fin 42. When the turbo fan 43 is in operation, the air outside the frame 60 enters the first heat sink 41 from the air inlet 61 on the frame 60, and the heat on the first heat sink 41 is conducted to the incoming air, passing through the turbo fan 43. When the second fins 42 are blown, the air that has absorbed the heat flows out from the air outlet 62 on the casing 30, and further reaches the purpose of dissipating heat to the respective components in the casing 60. In order to prevent the airflow from flowing back to affect the heat dissipation efficiency, the first heat sink 41 and the second heat sink 42 are sealed. In this embodiment, one of the first heat sink 41 and the second heat sink 42 is integrally sealed, and the other heat sink is sealed with a tape and a sealed casing to prevent backflow and reduce cost.

In other embodiments, the air inlet on the frame may correspond to the second heat sink, and the air outlet corresponds to the first heat sink, and the air enters the second heat sink through the air inlet. The second heat sink flows toward the first heat sink and finally flows out through the air outlet.

In other embodiments, the first heat sink and the second heat sink may also be integrally sealed, or the first heat sink and the second heat sink may be sealed by a tape and a sealing shell.

Further, the display device is applied to the UAV control terminal, and the present invention further provides an embodiment of the UAV system. The UAV system of the embodiment includes a UAV and a UAV control terminal, and no one The machine control terminal includes the display devices shown in FIGS. 5 and 6.

In summary, the backlight module, the display device, and the unmanned aerial vehicle system provided by the embodiment of the present invention, the backlight module has at least one first heat pipe disposed on one side of the circuit board, and A heat pipe extends along a direction in which the light source is disposed, and an evaporation end of the first heat pipe is disposed corresponding to the light source, and a condensation end extends to another light incident surface side of the backlight module where the light source is not disposed. The heat of the light source of the backlight module is transmitted to the portion of the backlight module where the light source is not disposed, and the heat is dissipated through the condensation end of the first heat pipe, thereby effectively improving the heat dissipation efficiency of the backlight module.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

A backlight module, comprising:

At least one light source disposed on a portion of the light incident surface of the backlight module;

a circuit board electrically connected to the at least one light source for fixing the light source and providing power to the light source;

The at least one first heat pipe is disposed on one side of the circuit board and extends along a direction in which the light source is disposed. The evaporation end of the first heat pipe is disposed corresponding to the light source, and the condensation end extends to the backlight module. Another portion of the light source enters the light side to transfer heat from the light source to the condensation end of the first heat pipe for heat dissipation.
The backlight module of claim 1 , wherein the backlight module further comprises a heat conducting component disposed between the circuit board and the first heat pipe;

The heat conducting component comprises a thermal conductive adhesive and a metal plate;

The thermal conductive adhesive is used to adhere the circuit board to the metal plate;

The metal plate is connected to the first heat pipe for conducting heat of the light source to the first heat pipe for heat dissipation.
The backlight module according to claim 2, wherein the metal plate is a reinforcing metal plate.
The backlight module of claim 2, wherein the backlight module is a side-in backlight module;

The at least one light source is disposed on two first direction sides and a second direction side of the backlight module, and the metal plate is disposed on a bottom surface side of the backlight module;

The number of the first heat pipes is two, and the two first heat pipes are a bending mechanism including a first direction portion and a second direction portion; the first direction portion is disposed at the first of the backlight module On the metal plate corresponding to the direction side, the second direction portion is disposed on the metal plate corresponding to the second direction side of the backlight module, and the condensation end of the two first heat pipes extends to the The other second direction side of the backlight module is not provided with a light source.
A display device, comprising: a frame body, a display panel, a driving circuit board, a heat dissipating component, and a backlight module;

The display panel, the driving circuit board, the heat dissipating component, and the backlight module are all disposed in the frame, the backlight module is disposed on a light incident side of the display panel, and the driving circuit board and the display panel Electrically connecting to the backlight module; wherein

The backlight module is the backlight module according to any one of claims 1 to 4, wherein the heat dissipation component is disposed corresponding to a condensation end of the first heat pipe for dissipating heat to the backlight module; and/or

The display device includes a second heat pipe disposed on one side of the driving circuit board, and a condensation end of the second heat pipe corresponds to the heat dissipating component for transmitting heat of the driving circuit board to the heat dissipating component Cool down.
The display device according to claim 5, wherein the heat dissipation component comprises a first heat sink;

The evaporation end of the second heat pipe is disposed on the driving circuit board, and the condensation end extends to the first heat sink.
The display device according to claim 6, wherein the display device further comprises a second heat sink;

The condensation end of the first heat pipe extends to the second heat sink.
The display device according to claim 7, wherein the display device further comprises a fan, and the fan is disposed between the first heat sink and the second heat sink.
The display device according to claim 7, wherein the fan is a turbo fan; the first heat sink and the second heat sink are respectively disposed at an air inlet and an air outlet of the fan.
The display device according to claim 9, wherein the first heat sink and the second heat sink are sealingly disposed to extend air along the extending direction of the first heat sink and the second heat sink motion.
An unmanned aerial vehicle system, comprising a drone and a drone control terminal, characterized in that the drone control terminal comprises the display device according to any one of claims 5-10.