CN209962056U

CN209962056U - Backlight module with built-in heat dissipation device and liquid crystal display

Info

Publication number: CN209962056U
Application number: CN201920876020.3U
Authority: CN
Inventors: 马新悦; 何勇
Original assignee: SHENZHEN XINTIANYUAN ELECTRONIC CO Ltd
Current assignee: SHENZHEN XINTIANYUAN ELECTRONIC CO Ltd
Priority date: 2019-06-12
Filing date: 2019-06-12
Publication date: 2020-01-17
Anticipated expiration: 2029-06-12

Abstract

A backlight module with a built-in heat dissipation device and a liquid crystal display screen comprise a back plate, a light bar, a reflecting plate, a light guide plate and an optical diaphragm, wherein the back plate comprises a bottom plate and a side plate vertically arranged at the edge of the bottom plate; compared with the prior art, the beneficial effects of the utility model reside in that: through set up a plurality of recesses on the heat-conducting plate and form a plurality of heat dissipation channels with reflecting plate direct contact, realize natural convection heat dissipation, through addding exhaust fan group and air supply unit, realize forcing convection heat dissipation, improve the radiating efficiency, increase life.

Description

Backlight module with built-in heat dissipation device and liquid crystal display

[ technical field ] A method for producing a semiconductor device

The utility model relates to a LCD screen technical field, specificly relate to a built-in heat abstractor's backlight unit and LCD screen.

[ background of the invention ]

The backlight module is the provider of the light source of the liquid crystal display, and the appearance of the light source of the backlight module determines the visual sense of the display. The requirements of liquid crystal displays on brightness and chromaticity are becoming more and more strict, and the overall cost ratio of the backlight module is also becoming higher and higher, and the backlight module must be developed in the direction of low power consumption, high brightness and high uniformity to meet the industry requirements. The LED light source has the advantages of high brightness, low power consumption, small volume, long service life and the like, so that the backlight module adopts the LED light source as a market trend.

However, since the performance and the lifetime of the LED are directly related to the junction temperature, if the backlight module is designed poorly, the heat energy generated inside the backlight module cannot be effectively conducted out, which causes the working temperature of the backlight module to be greatly increased, and directly affects the performance and the lifetime of the LED. Because the luminous efficiency of LED is lower, the during operation can produce a large amount of heats, if do not solve the heat dissipation problem, can lead to the decay of LED luminance and the shortening of life. In order to prevent the heat generated by the LEDs from affecting the luminance and chromaticity of the backlight module, the LEDs need to be designed for heat dissipation. In order to achieve a better heat dissipation effect, an aluminum substrate is adopted for natural heat dissipation in the prior art, but the temperature is still difficult to be reduced to the normal working temperature in a high-load operation or high-temperature environment by the method.

Accordingly, there is a need for a backlight module with a built-in heat dissipation device and a liquid crystal display panel to overcome the deficiencies of the prior art.

[ Utility model ] content

The utility model aims at providing a built-in heat abstractor's backlight unit and LCD screen aims at improving the radiating efficiency, increases life.

In order to achieve the above object, the present invention provides a backlight module with a built-in heat dissipation device, which includes a back plate, a light bar, a reflective plate, a light guide plate and an optical diaphragm, wherein the back plate includes a bottom plate and a side plate vertically disposed at an edge of the bottom plate, the light bar is disposed on an inner wall of the side plate, the reflective plate is disposed above the bottom plate, the light guide plate is disposed on an upper surface of the reflective plate, and the optical diaphragm is disposed on an upper surface of the light guide plate;

the bottom plate with be equipped with heat abstractor between the reflecting plate, heat abstractor includes heat insulating board, heat-conducting plate, exhaust unit and air feeder unit, the heat insulating board with the tiling on the bottom plate, the heat-conducting plate with the heat insulating board deviates from the one side contact of bottom plate, the inside of heat-conducting plate is equipped with a plurality of refrigerant pipes, the heat-conducting plate with the one side of reflecting plate contact is equipped with a plurality of recesses, a plurality of recesses with form a plurality of heat dissipation passageways between the reflecting plate, the exhaust unit is located the top of heat-conducting plate, the air feeder unit is located the bottom of heat-conducting plate.

In a preferred embodiment, the blower unit includes a first fixing frame and a plurality of first micro fans disposed in the first fixing frame, the plurality of first micro fans are disposed in parallel, and each first micro fan faces an air inlet of one refrigerant pipe.

In a preferred embodiment, the exhaust fan set includes a second fixing frame and a plurality of second micro fans disposed in the second fixing frame, the plurality of second micro fans are disposed in parallel, and each second micro fan faces the air outlet of one of the refrigerant pipes.

In a preferred embodiment, the grooves are distributed in an array, so that the surface of the heat conducting plate, which is in contact with the reflecting plate, is in a wave shape.

A liquid crystal screen comprises an outer frame, a liquid crystal panel and the backlight module with the built-in heat dissipation device, wherein the liquid crystal panel is arranged on an optical film of the backlight module with the built-in heat dissipation device, and the outer frame is arranged outside a back plate.

Compared with the prior art, the utility model provides a pair of built-in heat abstractor's backlight unit and LCD screen's beneficial effect lies in: through set up a plurality of recesses on the heat-conducting plate and form a plurality of heat dissipation channels with reflecting plate direct contact, realize natural convection heat dissipation, through addding exhaust fan group and air supply unit, realize forcing convection heat dissipation, improve the radiating efficiency, increase life.

[ description of the drawings ]

Fig. 1 is a sectional structure view of the backlight module and the lcd panel with a built-in heat dissipation device provided by the present invention.

Fig. 2 is an exploded view of the heat sink shown in fig. 1.

[ detailed description ] embodiments

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1:

referring to fig. 1, the backlight module with the built-in heat dissipation device includes a back plate 10, a light bar 20, a reflective plate 30, a light guide plate 40 and an optical film 50, where the back plate 10 includes a bottom plate 11 and a side plate 12 vertically disposed at an edge of the bottom plate 11, the light bar 20 is disposed on an inner wall of the side plate 12, the reflective plate 30 is above the bottom plate 11, the light guide plate 40 is disposed on an upper surface of the reflective plate 30, and the optical film 50 is disposed on an upper surface of the light guide plate 40.

Specifically, referring to fig. 2, a heat dissipation device 60 is disposed between the bottom plate 11 and the reflection plate 30, the heat dissipation device 60 includes a heat insulation plate 61, a heat conduction plate 62, an exhaust unit 63, and an air blower unit 64, the heat insulation plate 61 is tiled on the bottom plate 11, the heat conduction plate 62 contacts with a surface of the heat insulation plate 61 away from the bottom plate 11, a plurality of refrigerant pipes 621 are disposed inside the heat conduction plate 62, a plurality of grooves 622 are disposed on a surface of the heat conduction plate 62 contacting with the reflection plate 30, a plurality of heat dissipation channels 623 are formed between the plurality of grooves 622 and the reflection plate 30, the exhaust unit 63 is located at the top of the heat conduction plate 62, and the air blower unit 64 is located at the bottom of the heat conduction plate 62.

It can be understood that the backlight module with the built-in heat dissipation device generates a large amount of heat during operation, the heat conduction plate 62 directly contacts with the reflection plate 30, and the surface area is increased by the arrangement of the plurality of grooves 622, which is beneficial to enhancing heat conduction and increasing the temperature of the heat conduction plate 62, and since hot air naturally flows upwards, the hot air in the heat dissipation channel 623 naturally flows upwards, and then takes away a part of heat of the heat conduction plate 62; meanwhile, under the driving of the blower unit 64, air can be driven to enter the refrigerant pipe 621 and blown away by the exhaust unit 63, so as to further cool the heat conducting plate 62. The natural convection heat dissipation is realized by arranging the heat dissipation channel 623, the forced convection heat dissipation is realized by additionally arranging the exhaust fan set 63 and the air supply unit 64, the heat dissipation efficiency is high, and the service life is prolonged.

Further, the blower unit 64 includes a first fixing frame 641 and a plurality of first micro fans 642 disposed in the first fixing frame 641, the plurality of first micro fans 642 are disposed in parallel, and each first micro fan 642 faces the air inlet of one of the refrigerant pipes 621. The exhaust unit 63 includes a second fixing frame 631 and a plurality of second micro fans 642 disposed in the second fixing frame 631, the plurality of second micro fans 642 are disposed in parallel, and each second micro fan 642 faces the air outlet of one of the cooling medium pipes 621. The miniature fan is adopted to realize forced convection, and the noise and the power consumption are low.

Further, a plurality of grooves 622 are distributed in an array, so that the surface of the heat conductive plate 62 contacting the reflection plate 30 has a wavy shape.

Example 2:

the liquid crystal display comprises an outer frame 70, a liquid crystal panel 80 and the backlight module with the built-in heat dissipation device as described in embodiment 1, wherein the liquid crystal panel 80 is disposed on an optical film 50 of the backlight module with the built-in heat dissipation device, and the outer frame 70 is disposed outside the back plate 10.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a backlight module of built-in heat abstractor, includes backplate, lamp strip, reflecting plate, light guide plate and optics diaphragm, the backplate includes the bottom plate and sets up perpendicularly at the curb plate at bottom plate edge, the lamp strip sets up on the inner wall of curb plate, the reflecting plate is in the bottom plate top, the light guide plate sets up the upper surface of reflecting plate, the optics diaphragm sets up the upper surface at the light guide plate, its characterized in that: the bottom plate with be equipped with heat abstractor between the reflecting plate, heat abstractor includes heat insulating board, heat-conducting plate, exhaust unit and air feeder unit, the heat insulating board with the tiling on the bottom plate, the heat-conducting plate with the heat insulating board deviates from the one side contact of bottom plate, the inside of heat-conducting plate is equipped with a plurality of refrigerant pipes, the heat-conducting plate with the one side of reflecting plate contact is equipped with a plurality of recesses, a plurality of recesses with form a plurality of heat dissipation passageways between the reflecting plate, the exhaust unit is located the top of heat-conducting plate, the air feeder unit is located the bottom of heat-conducting plate.

2. The backlight module with built-in heat dissipation device as claimed in claim 1, wherein: the air supply unit comprises a first fixing frame and a plurality of first micro fans arranged in the first fixing frame, the first micro fans are arranged in parallel, and each first micro fan is opposite to the air inlet of one refrigerant pipe.

3. The backlight module with built-in heat dissipation device as claimed in claim 2, wherein: the exhaust fan set comprises a second fixing frame and a plurality of second micro fans arranged in the second fixing frame, the plurality of second micro fans are arranged in parallel, and each second micro fan is over against the air outlet of one refrigerant pipe.

4. The backlight module with built-in heat dissipation device as claimed in claim 1, wherein: the grooves are distributed in an array mode, so that one surface, in contact with the reflecting plate, of the heat conducting plate is in a wavy shape.

5. A liquid crystal screen is characterized in that: the backlight module comprises an outer frame, a liquid crystal panel and the built-in heat dissipation device as claimed in any one of claims 1 to 4, wherein the liquid crystal panel is arranged on an optical film of the backlight module of the built-in heat dissipation device, and the outer frame is arranged outside the back plate.