CN114967239A

CN114967239A - Back plate of backlight module, backlight module and display device

Info

Publication number: CN114967239A
Application number: CN202210904237.7A
Authority: CN
Inventors: 杨晓辉; 康报虹
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2022-08-30
Anticipated expiration: 2042-07-29
Also published as: CN114967239B; WO2024021428A1

Abstract

The application discloses backlight unit's backplate, backlight unit and display device, backlight unit includes the backplate and sets up lamp plate on the backplate, the backplate orientation the one side of lamp plate is equipped with an at least sunken heat dissipation channel, the backplate includes at least one income wind gap and at least one air outlet, go into the wind gap with the air outlet runs through the backplate, and with heat dissipation channel's both ends are linked together. Through above-mentioned design for external air current can get into from the income wind gap of backplate, then behind the heat dissipation channel, flows out from the air outlet of backplate, makes the cold air current take away the heat on lamp plate and the backplate, reaches further radiating effect.

Description

Back plate of backlight module, backlight module and display device

Technical Field

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

Background

With the development and maturity of the Mini LED display technology in recent years, the display adopting the Mini LED backlight gradually enters the family of the public users, and the superior performance of the display in the aspect of image quality brings different visual experience to the users. Although the Mini LED backlight display has many advantages, there are some unsatisfactory defects due to technical limitations, such as heat dissipation problem of the Mini LED lamp panel.

Because most of the current display products adopt a passive heat dissipation scheme, the back plate is attached to the whole surface of the lamp panel, and the heat generated by the lamp beads on the lamp panel is dissipated by utilizing the material of the back plate, so that the heat dissipation efficiency is lower; if the LED lamp bead is designed to have high current and large heat productivity, the LED lamp bead can be burnt out if the LED lamp bead is used for a long time.

Disclosure of Invention

The application aims at providing a backlight module's that radiating effect is good backplate, backlight unit and display device.

The application discloses backlight unit's backplate, backlight unit includes the backplate and sets up lamp plate on the backplate, the backplate orientation the one side of lamp plate is equipped with an at least sunken heat dissipation channel, the backplate includes at least one income wind gap and at least one air outlet, go into the wind gap with the air outlet runs through the backplate, and respectively with heat dissipation channel's both ends are linked together.

Optionally, a plurality of heat dissipation channels arranged in parallel are arranged on the back plate, and both ends of each heat dissipation channel are provided with the corresponding air inlet and the corresponding air outlet; it is adjacent heat dissipation channel passes through at least one ventiduct intercommunication, the ventiduct by the backplate is local to sink and is formed, on the backplate heat dissipation channel with the ventiduct is latticed and arranges.

Optionally, all the air inlets on the back plate are located on the same side of the back plate, all the air outlets on the back plate are also located on the same side of the back plate, and the air inlets and the air outlets are located on two opposite sides of the back plate respectively.

Optionally, the cross-sectional area of the heat dissipation channel close to the air inlet is larger than the cross-sectional area of the heat dissipation channel close to the air outlet; the cross-sectional area of the ventilation channel is smaller than that of the heat dissipation channel close to the air inlet.

Optionally, the air inlet is located on the ground side of the back plate, the air outlet is located on the top side of the back plate, and when the backlight module is used, the top side is higher than the ground side.

Optionally, along the air inlet direction, the aperture of the air inlet is gradually reduced; along the direction of air-out, the bore of air outlet increases gradually.

Optionally, the air inlet and the air outlet are both located on the side wall of the heat dissipation channel.

Optionally, the air inlet and the air outlet are both of a mesh structure, the air inlet is formed by a plurality of air inlet holes arranged in an array, and the air outlet is formed by a plurality of air outlet holes arranged in an array.

The application also discloses backlight unit, including lamp plate, optical assembly and as above backlight unit's backplate, the lamp plate sets up on the backplate, optical assembly sets up on the lamp plate.

The application also discloses a display device, including display panel and as above backlight unit, backlight unit does display panel provides backlight.

Compared with the scheme that the back plate is attached to the whole surface of the lamp panel, and the heat generated by the lamp beads on the lamp panel is dissipated by utilizing the material of the back plate; according to the lamp, the heat dissipation channel is designed on the back plate, and the air inlet and the air outlet are designed at the two ends of the heat dissipation channel, so that external air flow can enter from the air inlet of the back plate and then flows out from the air outlet of the back plate after passing through the heat dissipation channel, and the cold air flow takes away heat on the lamp panel and the back plate, and the heat dissipation effect is achieved; moreover, the backboard and most of the lamp panel are adhered together, so that the lamp panel can be radiated by self materials under the condition of not influencing the stability of the lamp panel; thus, one part of heat emitted by the lamp beads on the lamp panel is transmitted to the outside through the back plate, and the other part of heat is taken out through cold air flowing through the heat dissipation channel, so that the dual heat dissipation effect is achieved, and the lamp panel can be rapidly cooled.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic view of a backing plate provided herein;

FIG. 2 is a schematic view of a first backing plate according to the first embodiment of the present application;

FIG. 3 is a schematic view of a second backing plate provided in the first embodiment of the present application;

FIG. 4 is a schematic view of a third backing plate provided in the first embodiment of the present application;

FIG. 5 is a schematic view of a first air inlet provided in the first embodiment of the present application;

FIG. 6 is a schematic view of a second type of air inlet provided in the first embodiment of the present application;

FIG. 7 is a schematic view of a third air inlet provided in the first embodiment of the present application;

FIG. 8 is a schematic view of a fourth air inlet provided in the first embodiment of the present application;

FIG. 9 is a schematic view of a backing plate according to a second embodiment of the present application;

FIG. 10 is a schematic view of a backing plate according to a third embodiment of the present application;

FIG. 11 is a schematic cross-sectional view of a backlight module provided in the present application;

fig. 12 is a schematic block diagram of a display device provided in the present application.

10, a display device; 20. a backlight module; 30. a display panel; 100. a back plate; 110. a heat dissipation channel; 120. an air inlet; 121. an air inlet hole; 130. an air outlet; 131. an air outlet; 140. an air duct; 200. a lamp panel; 300. an optical component; t, day side; B. and (4) a ground side.

Detailed Description

It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.

In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.

The present application is described in detail below with reference to the figures and alternative embodiments.

As shown in fig. 1, the application discloses backlight unit's backplate 100, backlight unit includes backplate 100 and sets up lamp plate on the backplate 100, backplate 100 orientation the one side of lamp plate 200 is equipped with at least one sunken heat dissipation channel 110, backplate 100 includes at least one income wind gap 120 and at least one air outlet 130, go into the wind gap 120 with air outlet 130 runs through backplate 100, and respectively with heat dissipation channel 110's both ends are linked together.

According to the lamp panel, the heat dissipation channel 110 is designed on the back panel 100, and the air inlet 120 and the air outlet 130 are designed at two ends of the heat dissipation channel 110, so that external air flow can enter from the air inlet 120 of the back panel 100 and then flow out from the air outlet 130 of the back panel 100 after passing through the heat dissipation channel 110, and heat on the lamp panel 200 and the back panel 100 is taken away by cold air flow, and a heat dissipation effect is achieved; moreover, most of the backboard 100 and the lamp panel 200 are adhered together, so that the lamp panel 200 can be radiated by the material of the backboard 100 without affecting the stability of the lamp panel 200; thus, a part of heat emitted by the lamp beads on the lamp panel 200 is transferred to the outside through the backboard 100, and the other part of heat is taken out through cold airflow flowing through the heat dissipation channel 110, so that the dual heat dissipation effect is achieved, and the lamp can be rapidly cooled.

Above-mentioned backplate 100 designs mainly to backlight unit 20 of straight following formula, especially adopt the backlight unit 20 of Mini LED, because the lamp pearl quantity in the Mini LED backlight unit 20 is many, the amount of generating heat is high, more need reach quick radiating effect through this backplate 100 design that this application provided, can effectively reduce the operating temperature of Mini LED lamp pearl in the backlight unit 20, improve its life and safety in utilization, can suitably promote the electric current that switches on the lamp pearl simultaneously, increase its light efficiency, improve backlight unit 20's light intensity.

This application still further improves backplate 100 to the radiating effect to lamp plate 200 and lamp pearl is improved, specifically adopts following design.

As shown in fig. 2, a plurality of heat dissipation channels 110 arranged in parallel are disposed on the back plate 100, and both ends of each heat dissipation channel 110 are provided with the corresponding air inlet 120 and the corresponding air outlet 130; the adjacent heat dissipation channels 110 are communicated through at least one ventilation channel 140, the ventilation channel 140 is formed by locally sinking the backboard 100, and the heat dissipation channels 110 and the ventilation channel 140 on the backboard 100 are arranged in a grid shape.

In the embodiment of the present application, the back plate 100 is made of a metal material, preferably a metal material with good heat conductivity, so as to accelerate heat dissipation from the lamp panel 200.

The heat dissipation channels 110 and the ventilation channels 140 on the back plate 100 may be formed by simultaneously grooving the back plate 100, or by partially sinking the back plate 100, and specifically, the back plate 100 having the heat dissipation channels 110 and the ventilation channels 140 may be formed by stamping a plate material by a stamping process. The air inlet 120 and the air outlet 130 are formed by opening holes at two ends of the heat dissipation channel 110.

After the heat dissipation channels 110 are communicated through the ventilation channels 140, the airflow can flow in the longitudinal direction and the transverse direction of the back plate 100, and the direction of the airflow specifically refers to the direction of the arrows in fig. 2, so that the airflow can flow through more areas and take away heat of more areas; compared with the air inlet or the air outlet with a larger size, the air inlet 120 and the air outlet 130 are arranged, the total area communicated with the outside is equivalent to the area of the air inlet or the air outlet with a larger size, so that the normal flow rate of air flow can be guaranteed, meanwhile, the area of the single air inlet 120 and the area of the single air outlet 130 are reduced, the dust can be prevented from entering the air inlet or the air outlet, and meanwhile, foreign matters can be prevented from entering the backlight module 20 from the air inlet 120 and the air outlet 130. Moreover, the heat dissipation channels 110 and the ventilation channels 140 on the back panel 100 are arranged in a grid shape, so that the heat dissipation effect on the lamp panel 200 is more uniform, and the problem of overhigh local temperature is avoided.

Meanwhile, in the embodiment of the present application, all the air inlets 120 on the back plate 100 are on the same side of the back plate 100, and all the air outlets 130 on the back plate 100 are on the same side of the back plate 100, so that the air inlets 120 and the air outlets 130 are respectively located on two opposite sides of the back plate 100. Thus, the outside air enters from one side of the back plate 100 and exits from the other side, the flow direction of the air flow is the same, the problem of air flow disorder caused by conflict can not occur, and the flow rate of the air flow can not be influenced. It should be noted that, in the orientation shown in fig. 2, the laterally parallel side edges of the back panel 100 are defined as the top edge and the bottom edge, respectively, and the same side herein refers to the side near the bottom edge and the side near the top edge, respectively.

Based on the principle that the heated air expands and rises and the cooled air sinks, the positions of the air inlet 120 and the air outlet 130 in the back plate 100 are defined by the backlight module 20 and the display device 10 in the use state in the embodiment of the present application. Specifically, a top side T and a bottom side B are defined on the back plate 100, the air inlet 120 is located on the bottom side B of the back plate 100, and the air outlet 130 is located on the top side T of the back plate 100; when the backlight module 20 and the display device 10 are used, the top side T is higher than the bottom side B, that is, the position of the air outlet 130 is higher than the position of the air inlet 120, in other words, taking a desktop computer display as an example, the display includes a display screen and a base, the display screen is installed on the base, when the desktop computer display is installed on a computer desk, one side of the display screen close to the base corresponds to the bottom side of the backlight module, and one side of the display screen far away from the base corresponds to the top side of the backlight module.

After the design is adopted, the air in the heat dissipation channel 110 and the ventilation channel 140 expands and rises after being heated by the lamp panel 200 and the backboard 100, flows out of the air outlet 130, the air pressure of the original area where the part of hot air is located is reduced after the part of hot air flows upwards, the external cold air enters the heat dissipation channel 110 and the ventilation channel 140, the continuous process forms the flowing of the air flow, the hot air is continuously discharged towards the air outlet 130, and the cold air continuously flows towards the air inlet 120, so that the heat dissipation of the lamp panel 200 and the backboard 100 is continuously performed.

Of course, the embodiments of the present application may also design the positions of the air inlet 120 and the air outlet 130 not by the principle that the heated air expands and rises, but the cooled air sinks, for example, a fan may be disposed at the air inlet 120 and/or the air outlet 130 to blow the air flow, and the external cold air may also be introduced into the heat dissipation channel 110 and the air channel 140, and the hot air is exhausted. At this time, the fan can be directly communicated with the circuit in the backlight module 20, and starts to work when the lamp beads on the lamp panel 200 are started; further, a detection module and a control module are additionally arranged on the circuit board of the backlight module 20, and the fan is controlled to start when the heat of the lamp panel 200 is detected to reach a certain degree, so that the electric quantity can be saved; the fan can be controlled to automatically adjust the power according to different heat, and large noise is avoided when the fan is always in high power.

It should be noted that, in the embodiment of the present application, the positions of the air inlet 120 and the air outlet 130 do not need to be limited, and other auxiliary tools such as a fan do not need to be combined, and the heat dissipation effect on the lamp panel 200 can be improved through the heat dissipation channel 110, the air inlet 120, and the air outlet 130 on the back panel 100, because the air in the heat dissipation channel 110 expands and rises when being heated, flows out from one opening on the back panel 100, and attracts the external air flow to flow in from another opening on the back panel 100, so as to form the air flow.

Moreover, this application embodiment can also set up near heat dissipation channel 110 water-cooling structure or high heat dissipation material and further improve the radiating effect, perhaps, set up heat conduction materials such as heat conduction silica gel in ventiduct and heat dissipation channel and further accelerate the absorption to the lamp plate heat, further improve the radiating effect.

As shown in fig. 3, which is a further design of the heat dissipation channel 110 according to the embodiment of the present application, a cross-sectional area of the heat dissipation channel 110 near the air inlet 120 is larger than a cross-sectional area of the heat dissipation channel 110 near the air outlet 130; specifically, a gradual transition manner may be adopted, so that the cross-sectional area of the heat dissipation channel 110 is gradually reduced from the air inlet 120 to the air outlet 130.

After the heat dissipation channel 110 adopts such design, more external cold air enters from the air inlet 120, and the air flow gradually flows and is close to the in-process of the air outlet 130, and the cross-sectional area of the heat dissipation channel 110 gradually becomes smaller, and meanwhile, the air that needs to flow out is more, resulting in the acceleration of the flow rate of the air flow, thereby accelerating the exchange of the air flow inside and outside the backlight module 20, and further accelerating the cooling of the backboard 100 and the lamp panel 200.

When the air duct 140 is additionally arranged on the back plate 100, the cross-sectional area of the air duct 140 is smaller than the cross-sectional area of the heat dissipation channel 110 close to the air inlet 120, so that more air entering the heat dissipation channel 110 is not divided by the air duct 140, and the flow speed of the air flow is reduced.

Further, on the basis of the scheme corresponding to fig. 3, as the cross-sectional area of the heat dissipation channel 110 near the air inlet 120 is increased, the aperture of the corresponding air inlet 120 can be increased, so that more air enters the heat dissipation channel 110, and the ventilation effect is improved.

The embodiment of the present application further improves the air inlet 120 and the air outlet 130, as shown in fig. 4, which is a further design of the air inlet 120 and the air outlet 130 in the embodiment of the present application, the aperture of the air inlet 120 is gradually reduced along the air inlet direction; along the direction of air-out, the bore of air outlet 130 increases gradually.

By designing the air inlet 120 to have a wide outside and a small inside, the cold air is guided from the outside to the inside by the pressure difference; the air outlet 130 is designed to be small inside and large outside, and air is guided to be discharged outwards by air expansion acceleration; the air flow is also accelerated by the above design.

Specifically, the air inlet 120 and the air outlet 130 may be formed in a horn shape, the sidewall of the air inlet 120 is further inclined at 45 degrees, and the larger the diameter of the outside of the air inlet 120 is, the better the diameter is, which is beneficial to increasing the pressure difference and accelerating the cool air to enter the heat dissipation channel 110. Of course, the air inlet 120 and the air outlet 130 may also be made into a hole structure with regular shape, i.e. the inner and outer side calibers are the same; alternatively, only the air inlet 120 or the air outlet 130 may be made into a hole structure with a regular shape.

Further, in order to prevent dust and prevent foreign matters from entering the back of the backlight module 20, as shown in fig. 5-8, in the embodiment of the present application, the air inlet 120 is designed to be a mesh structure, at this time, the air inlet 120 is formed by a plurality of air inlet holes 121 arranged in an array, and the air inlet holes 121 may be circular holes, square holes or irregular holes; the plurality of air inlet holes 121 may be arranged in a circular array or a square array. Similarly, the air outlet 130 may also be designed with the air inlet 120, so that the air outlet 130 is formed by a plurality of air outlets 131 arranged in an array.

As shown in fig. 9, the second embodiment of the present application is different from the first embodiment in that the air inlet 120 is disposed on one side of the back plate 100, but the air outlet 130 on the back plate 100 is not disposed on the same side of the back plate 100, and may be disposed on two sides of the back plate 100, or may be disposed on three sides of the back plate 100. Specifically, the air outlet 130 is also provided at the end of the air duct 140, the air outlet 130 may be provided at only one end of the air duct 140, or the air outlets 130 are provided at both ends of the air duct 140, and in order to avoid the disturbance of the air flow inside the heat dissipation channel 110 caused by the external air entering from the air outlet 130 and the influence on the flow rate of the air flow, the embodiment of the present application further adds a fan at the air inlet 120, so that the external air enters only from the air inlet 120 through the air pressure and comes out from all the air outlets 130, and the mutual interference is avoided.

Because the cold air enters from the air inlet 120 and passes through the heat dissipation channel 110 and the ventilation duct 140, the air is gradually heated, so that the heat of the air at the air outlet 130 is high, the heat dissipation of the back plate 100 and the lamp panel 200 at the air outlet 130 is slow, the heat dissipation effect of the lamp panel 200 corresponding to different positions of the heat dissipation channel 110 is different, the heat dissipation is uneven, and the problem of local overheating is easily caused. Based on this, in the embodiment of the present application, the air outlets 130 are disposed on multiple sides of the back plate 100, so that the heated air can flow out from multiple sides of the back plate 100, and the air flow in the heat dissipation channel 110 and the air channel 140 is detailed in the direction of the arrow in fig. 9, so that the air flow is not gathered on only one side of the back plate 100, thereby making the heat dissipation of the back plate 100 more uniform.

As shown in fig. 10, as a third embodiment of the present application, the difference between the first embodiment and the second embodiment is that the air inlet 120 and the air outlet 130 are not formed at the bottom of the heat dissipation channel 110, but are formed at the side wall of the heat dissipation channel 110. In the embodiment of the present application, since the air inlet 120 and the air outlet 130 are disposed on the sidewall of the heat dissipation channel 110 and perpendicular to the back plate 100, when the backlight module 20 and the display device 10 are placed on a desktop or held in a hand of a user, the air inlet 120 and the air outlet 130 are not blocked, so that the heat dissipation effect is not affected, and the moisture below the back plate 100 is prevented from flowing into the heat dissipation channel 110.

As shown in fig. 11, the present application further discloses a backlight module 20, where the backlight module 20 includes a lamp panel 200, an optical assembly 300 and a backplane 100, the lamp panel 200 is disposed on the backplane 100, the optical assembly 300 is disposed on the lamp panel 200, and the backplane 100 is designed with reference to fig. 1 to 10, which is not described herein in detail.

As shown In fig. 12, the present application further discloses a display device 10, the display device 10 includes a display panel 30 and a backlight module 20 shown In fig. 11, the display panel 30 may be a TN (Twisted Nematic) display panel 30, an IPS (In-Plane-Switching) display panel 30, a VA (Vertical-Alignment) display panel 30, an MVA (Multi-Domain-Vertical-Alignment) display panel 30, and the present application is not limited thereto.

In addition, the inventive concept of the present application can form a great number of embodiments, but the present application has a limited space and cannot be listed one by one, so that on the premise of no conflict, the above-described embodiments or technical features can be combined arbitrarily to form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced.

The foregoing is a further detailed description of the present application in connection with specific alternative embodiments and it is not intended that the present application be limited to these specific details. For those skilled in the art to which the present application pertains, several simple deductions or substitutions can be made without departing from the spirit of the present application, and all should be considered as belonging to the protection scope of the present application.

Claims

1. The utility model provides a backlight unit's backplate, backlight unit includes the backplate and sets up lamp plate on the backplate, its characterized in that, the backplate orientation the one side of lamp plate is equipped with at least one sunken heat dissipation channel, the backplate includes at least one income wind gap and at least one air outlet, go into the wind gap with the air outlet runs through the backplate, and respectively with heat dissipation channel's both ends are linked together.

2. The back plate of a backlight module as claimed in claim 1, wherein the back plate is provided with a plurality of heat dissipation channels arranged in parallel, and both ends of each heat dissipation channel are provided with the corresponding air inlet and the corresponding air outlet;

it is adjacent heat dissipation channel passes through at least one ventiduct intercommunication, the ventiduct by the backplate is local to sink and is formed, on the backplate heat dissipation channel with the ventiduct is latticed and arranges.

3. The back plate of claim 2, wherein all of the air inlets on the back plate are located on the same side of the back plate, all of the air outlets on the back plate are located on the same side of the back plate, and the air inlets and the air outlets are located on opposite sides of the back plate, respectively.

4. The backplane of claim 2, wherein the cross-sectional area of the heat dissipation channel near the air inlet is larger than the cross-sectional area of the heat dissipation channel near the air outlet;

the cross-sectional area of the ventilation channel is smaller than that of the heat dissipation channel close to the air inlet.

5. The back plate of the backlight module as claimed in any one of claims 1 to 4, wherein the air inlet is located at a ground side of the back plate, the air outlet is located at a top side of the back plate, and the top side is higher than the ground side when the backlight module is in use.

6. The back plate of a backlight module as claimed in claim 5, wherein the aperture of the air inlet is gradually reduced along the direction of the air inlet; along the direction of air-out, the bore of air outlet increases gradually.

7. The back plate of claim 1, wherein the air inlet and the air outlet are located on a sidewall of the heat dissipation channel.

8. The backplane of claim 1, wherein the air inlet and the air outlet are both mesh structures, the air inlet is formed by a plurality of air inlet holes arranged in an array, and the air outlet is formed by a plurality of air outlet holes arranged in an array.

9. A backlight module characterized by comprising a lamp panel, an optical assembly and a back plate of the backlight module as claimed in any one of claims 1 to 8, wherein the lamp panel is arranged on the back plate, and the optical assembly is arranged on the lamp panel.

10. A display device comprising a display panel and the backlight module of claim 9, wherein the backlight module provides backlight for the display panel.