KR102256938B1 - A Cooler for Display Device - Google Patents

Abstract

The present invention, the enclosure 30 provided with a transmission surface on the front surface (35); A display module 10 accommodated in the housing 30 and spaced apart from the front 35 and rear 36 of the housing; The space between the front surface 35 of the housing 30 and the front surface 11 of the display module 10, the space between the side surface of the housing 30 and the side surface of the display module, and the rear surface 36 of the housing 30 ) And a closed circulation path 50 for circulating the space between the rear surface 12 of the display module 10; An open flow path 70 provided outside the enclosure 30; And heat absorbed by the refrigerant of the first heat exchanger 91 provided inside the enclosure 30 from the air circulating in the closed circulation path 50 in the second heat exchanger 95 provided outside the enclosure 30. Including, the cooling device 90 is: a first heat exchange which is disposed between the side surface of the display module 10 and the side surface of the enclosure 30 facing the display module 10 and evaporates the refrigerant. Group 91; A compressor (93) for compressing the refrigerant vaporized in the first heat exchanger (91); A second heat exchanger (95) disposed in the machine room (39) provided at the rear of the housing (30) and condensing the high-temperature, high-pressure refrigerant compressed by the compressor (93); And an expansion valve 97 disposed between the second heat exchanger 95 and the first heat exchanger 91.

Description

Display cooling device {A Cooler for Display Device}

The present invention relates to a display cooling device.

LCDs (liquid crystal displays) and OLEDs (organic light emitting diodes), which are widely used as displays, can be manufactured in a flat plate shape and are becoming larger in size. If the temperature of the display rises, it may cause a malfunction and an error such as a screen not being displayed may occur. Therefore, while the display is operating, it is also cooled.

There are various causes of increasing the temperature of the display, such as the temperature of the surrounding environment, direct sunlight, and heat generated by making the display brighter because the surrounding environment is bright. In particular, as displays become larger in area, efficient cooling for displays is more urgently required.

In view of this, in the related art, an air circulation path circulating in front and rear of the display is made, and a cooling structure in which air is circulated and heat is discharged to the outside has been applied. The circulating air discharges heat to the outside through a heat exchanger that discharges heat to the outside.

Since the above-described circulating air passes through the front of the display, there is a problem that foreign matter enters the front of the display when circulating air is mixed with external air during cooling. Therefore, the above-described circulating air is designed to circulate in an isolated state so as not to be mixed with external air. In order to prevent circulating air from being mixed with external air, heat is discharged from the heat exchanger to the outside through heat conduction. In order to increase the thermal conductivity, the cross-sectional area of the heat conduction area must be large.

In view of this, most of the heat exchangers installed in conventional display devices are installed in the rear space of the display. Since it is possible to install a heat exchanger with a large area in the rear space of the display as much as it corresponds to the area of the display, it is not a bad choice to install a heat exchanger in the rear of the display from the viewpoint of increasing the thermal conductivity.

However, since such a conventional heat exchanger has to be installed while avoiding the location of various substrates or related parts existing behind the display, its structure becomes complicated, and it is particularly difficult to design or produce in response to a curved display.

In particular, since the heat exchanger itself occupies a certain thickness, it is difficult to design a slim product because the thickness of the display device becomes thicker if the heat exchanger is disposed behind the display.

In view of this, it is possible to consider placing the heat exchanger on the side of the display. However, the side portion of the display has a small volume that can be secured compared to the rear portion of the display, so there is a limitation in securing a heat conduction area between air and air in the heat exchanger.

In the prior art described above, since the air circulating inside the enclosure and the air outside the enclosure transfer heat through direct heat conduction with a surface separating the two air between them, it is very possible to secure a surface area where the two air face each other. It is important. Therefore, in order to increase the surface area of the conventional heat exchanger of this type, it has no choice but to occupy a large volume.

The present invention was conceived to solve the above-described problem, and an object of the present invention is to provide a display cooling device that allows the heat of the circulating air inside the enclosure circulating around the display to be smoothly discharged to the outside of the display even when a small heat exchanger is used. It is done.

In order to solve the above-described problem, the present invention includes: a case 30 provided with a transmission surface on the front surface 35; A display module 10 accommodated in the housing 30 and spaced apart from the front 35 and rear 36 of the housing; The space between the front surface 35 of the housing 30 and the front surface 11 of the display module 10, the space between the side surface of the housing 30 and the side surface of the display module, and the rear surface 36 of the housing 30 ) And a closed circulation path 50 for circulating the space between the rear surface 12 of the display module 10; An open flow path 70 provided outside the enclosure 30; And heat absorbed by the refrigerant of the first heat exchanger 91 provided inside the enclosure 30 from the air circulating in the closed circulation path 50 in the second heat exchanger 95 provided outside the enclosure 30. Including, the cooling device 90 is: a first heat exchange which is disposed between the side surface of the display module 10 and the side surface of the enclosure 30 facing the display module 10 and evaporates the refrigerant. Group 91; A compressor (93) for compressing the refrigerant vaporized in the first heat exchanger (91); A second heat exchanger (95) disposed in the machine room (39) provided at the rear of the housing (30) and condensing the high-temperature, high-pressure refrigerant compressed by the compressor (93); And an expansion valve 97 disposed between the second heat exchanger 95 and the first heat exchanger 91.

A heat insulating layer 38 is provided between the machine room 39 and the inner space of the enclosure 30.

The compressor 93 and the expansion valve 97 are disposed in the machine room.

A substrate 37 for controlling the display module 10 is installed on the rear surface of the housing 30, and the substrate 37 is positioned at a position not overlapping with the machine room 39 at the rear of the housing 30. It is prepared.

A first fan 51 for pressurizing the air circulating through the closed circulation path 50 is installed in the enclosure.

A second fan 72 is installed in the machine room 39 to form an open flow path 70 through which air from outside the enclosure flows into the machine room.

The display module 10 is provided with a backlight unit 15, the backlight unit 15 is installed adjacent to the housing 16 of the display module 10 to conduct heat to the housing 16, and One heat exchanger (91) is installed adjacent to the housing (16).

The heating part of the backlight unit 15 is installed on the side surface of the display module 10, and the housing 16 contacts the heating part of the backlight unit and is installed on the side surface of the display module 10.

The first heat exchanger 91 includes a plurality of fins extending in a direction parallel to the air flow direction of the closed circulation path 50 passing through the first heat exchanger.

The second heat exchanger 95 includes a plurality of fins extending in a direction parallel to the air flow direction of the open flow path 70 passing through the second heat exchanger.

According to the display cooling device of the present invention, since heat generated from the display module can be forcibly discharged to the outside of the enclosure by using a cooling device of a heat pump type, the heat dissipation effect is very high.

In addition, according to the present invention, while increasing the heat dissipation effect, the cooling device can be designed more compactly.

Further, according to the present invention, since the air circulation path for cooling the inside of the enclosure and the air flow path for flowing outside the enclosure do not necessarily have to be adjacent, there is an advantage of increasing design freedom.

In addition to the above-described effects, specific effects of the present invention will be described together with explanation of specific matters for carrying out the present invention.

1 is a side cross-sectional view of a display in which a display cooling device according to the present invention is installed.
FIG. 2 is a perspective view of the display cooling device of FIG. 1.
3 is a rear view of the display cooling device of FIG. 1.
4 is a plan view of the display cooling device of FIG. 1.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

* The present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, only this embodiment makes the disclosure of the present invention complete and the scope of the invention to those of ordinary skill in the art It is provided to inform you.

The ⊙ mark on the drawing indicates the direction in which air penetrates or exits the paper of the drawing.

[Display module]

The display module 10 applied to the display according to the present invention includes a front surface 11 on which a screen is provided, a rear surface 12 facing the front surface 11, and between the front surface 11 and the rear surface 12. It has a slim rectangular parallelepiped shape including side surfaces connecting the front and rear surfaces.

The side surface of the display module 10 includes two long sides and two short sides. An LED array constituting a part of the backlight unit 15 is disposed on the two long sides. Hereinafter, for convenience, the two long sides are referred to as a first side and a second side, and the two short sides are referred to as a third side and a fourth side.

The LED array of the backlight unit 15 is fixedly installed on the display module 10 by the housing 16. In addition, the housing 16 further secures the rigidity of the overall display module 10.

[Enclosure]

The enclosure 30 includes the display module 10 and may have a substantially hollow rectangular parallelepiped shape having a larger volume than the display module 10. As will be described later, the enclosure 30 may have a substantially rectangular parallelepiped shape together with the machine room 39. The enclosure 30 isolates air circulating around the display module 10 inside the enclosure from the exterior of the enclosure. Therefore, the air inside the enclosure is not mixed with the air outside the enclosure, and thus, foreign substances from outside are prevented from entering the interior of the enclosure.

The front surface 35 of the enclosure 30 includes glass, which is a transparent surface through which the screen 11 of the display module accommodated in the enclosure can be viewed from the exterior of the enclosure. The front surface 35 of the housing 30 and the front surface 11 of the display module 10 are slightly spaced apart. The rear surface 36 of the enclosure 30 is spaced apart from the rear surface 12 of the display module 10, and a substrate 37 such as a PCB for controlling the display module 10 and supplying power is arranged in this space. .

The side surface of the enclosure 30 includes a first side, a second side facing the first side, and a third side and a fourth side disposed between the first side and the second side and facing each other. The first side and the second side may be long sides, and the third side and the fourth side may be short sides.

The first side and the second side, which are long sides of the housing 30, are disposed to correspond to the first side and the second side, which are long sides of the display module, and may be spaced apart from each other. In addition, the third side and the fourth side, which are short sides of the housing, are disposed to correspond to the third side and the fourth side, which are short sides of the display module, and may be spaced apart from each other. According to the present invention, since air circulates in the spaced space between the enclosure and the display, the long side of the enclosure and the long side of the display module may be spaced apart, or the short side of the enclosure and the short side of the display may be spaced apart. Both the long side and the short side of this display module may be spaced apart.

[Cooling device]

Since the display module 10, which is a heating element, is embedded inside the housing 30, if proper cooling is not performed in the space inside the housing, the display module 10 is placed in a high-temperature environment.

Accordingly, in the present invention, a structure in which a cooling device is installed in the enclosure 30 is provided. The cooling device has two heat exchangers, of which the first heat exchanger 91 is an interior of the enclosure and is disposed between the side surface of the display module 10 and the side surface of the enclosure 30. The first heat exchanger 91 may be an evaporator through which the refrigerant evaporates, and the refrigerant evaporates and cools the interior of the enclosure 30.

It is exemplified that the first heat exchanger is provided on both the first side and the second side. However, the first heat exchanger may be provided on either side of the first side and the second side. However, in the present invention, since the LED array is installed on both the first side and the second side, the first heat exchanger also provides a structure installed on both the first side and the second side corresponding thereto. This installation structure allows direct cooling of the LED array.

As described above, an LED array is installed on the side of the display module 10. The LED array is a heat source that occupies a significant portion of the heat generated by the display module 10, and is a component that must be smoothly cooled in the enclosure.

Accordingly, in the present invention, the first heat exchanger 91 is installed adjacent to the LED array on the side of the display module 10. Therefore, the heat generated from the LED array can be smoothly absorbed by the first heat exchanger 91.

In addition, since the LED array is installed inside the housing 16 from the side of the display module 10, the first heat exchanger 91 may be installed in contact with the housing 16.

The housing 16 is made of a material having high rigidity in order to support the rigidity of the display module 10. In addition, the housing is made of a material having high thermal conductivity so that heat generated from the LED array can be smoothly conducted to the first heat exchanger 91. As an example, the housing may be made of a metal material such as an aluminum alloy.

As described above, the housing 16 functions as a heat spreader that supports the rigidity of the display module 10 and at the same time smoothly transfers heat from the LED array to the first heat exchanger 91.

According to the present invention, the LED array is installed along the length direction of two long sides of the display module 10. The first heat exchanger is also installed in the housing 30 adjacent to the two long sides of the display module 10.

The front side 11, the rear side 12, and at least the side of the long side of the display module 10 installed inside the enclosure 30 are respectively the front side 35, the rear side 36, and the long side of the It is installed apart from the side. Then, the air circulates through the inside of the housing by the first fan 51 installed in the housing. The circulating air moves along the illustrated closed circulation path 50 and receives heat generated from the display module 10 from the front surface 11 and rear surface 12 and side surfaces of the display module 10.

The first heat exchanger 91 is provided with a plurality of fins at predetermined intervals, and the air circulating inside the enclosure 30 through the space between the fins is transferred to the first heat exchanger in a forward and backward direction. Pass 91. The first fan 51 may be disposed in front or behind the first heat exchanger 91. Then, the flow rate of air passing through the heat exchanger among the circulation paths becomes the fastest, so that heat exchange between the refrigerant inside the first heat exchanger and the circulating air is smoothly performed. The air circulating inside the enclosure absorbs heat from the display module 10 and the substrate 37 to be described later, and is cooled while passing through the first heat exchanger.

The refrigerant of the first heat exchanger 91 that is evaporated while absorbing heat from the air circulating in the closed circulation path 50 is introduced into the compressor 93 through a pipe. The compressor 93 pressurizes the gaseous refrigerant to make it high pressure.

Since the compressor 93 is also a kind of heat source, it is installed outside the enclosure 30. In the present invention, it is exemplified that the compressor 93 is installed in the machine room 39 provided at the rear of the enclosure 30.

The machine room 39 is a separate space separated from the enclosure 30, and is a space through which the open flow path 70 through which air outside the enclosure 30 flows. The machine room 39 may be arranged in a form in which a machine room space in the form of a rectangular parallelepiped is additionally provided outside the enclosure 30 in the form of a rectangular parallelepiped.

In the present invention, as shown, a form in which the machine room 39 is arranged to form a rectangular parallelepiped shape as a whole with the enclosure 30 is exemplified. Even if the enclosure 30 and the machine room 39 together form a rectangular parallelepiped shape, as shown in FIG. 4, between the rear surface of the enclosure 30 (that is, the front surface of the machine room 39) and the rear surface of the display module 10 Since are spaced apart, heat generated from the rear surface of the display module 10 facing the machine room 39 may also be cooled by air circulating through the closed circulation path 50.

Meanwhile, the gaseous refrigerant compressed at high pressure in the compressor 93 moves along a pipe, flows into the second heat exchanger 95, and is condensed. That is, the second heat exchanger 95 may be a condenser. The heat generated when the refrigerant is condensed in the condenser is cooled by the air in the open flow path 70 flowing through the machine room 39, and the air heated by heat exchange with the second heat exchanger 95 is outside the machine room. Is discharged as. In addition, the compressor 93 may also be placed in the open flow path 70 to be cooled.

The air flow inside the machine room is generated by the second fan 72 installed in the machine room, and the second fan 72 may be disposed at the inlet and/or outlet of the air flow in the machine room. According to the present invention, it is exemplified that the flow generated by the second fan 72 is a direction from the first side of the enclosure toward the second side, that is, a direction crossing the two long sides.

As will be described later, between the two long sides, the second heat exchanger 95 is disposed close to the third side that is the short side, and the substrate 37 is disposed close to the fourth side that is the short side. In addition, the substrate 37 is disposed next to the second heat exchanger so as not to overlap with the second heat exchanger 95 as shown in FIG. 4. Therefore, in order for the open flow path passing through the second heat exchanger 95 to flow in a direction crossing the two short sides, it is necessary to bypass the space in which the substrate 37 is installed. On the other hand, if the open flow path flows in a direction in which two long sides intersect, there is no need to bypass the substrate.

The refrigerant condensed in the second heat exchanger 95 flows into the first heat exchanger 91 in a state where it is good for vaporization by lowering the pressure through the expansion valve 97 along the pipe again. The refrigerant passes through the processes of compression, condensation, expansion, and evaporation within the cycle of the heat pump to discharge heat inside the enclosure to the outside of the enclosure.

A substrate 37 for controlling the display module and supplying power is installed in a predetermined space behind the display module 10 in the housing 30. The substrate 37 is installed at a position that does not overlap with the position of the machine room 39 when viewed in the front-rear direction as shown in FIG. 3. Of course, as shown in FIG. 4, even when viewed in the vertical direction, the substrate 37 is installed at a position not overlapping with the position of the machine room 39.

In this way, if the positions of the substrate and the machine room are not overlapped, the first heat exchanger is installed on the side of the enclosure, and the second heat exchanger is installed in the machine room, it is possible to design a rectangular parallelepiped display very slim and compact.

[machine room]

According to the present invention, the temperature around the first heat exchanger in the enclosure may be lower than the temperature around the second heat exchanger in the machine room. Therefore, it is preferable to block heat exchange between the machine room and the machine room by the partition wall between the machine room and the machine room. Accordingly, the present invention provides a structure in which the heat insulating layer 38 is further placed in the partition wall portion between the machine room and the enclosure.

In addition, in the present invention, in order to make the display slimmer, a structure is provided in which a substrate 37 is disposed on one rear side of the display module 10 and a machine room 39 is disposed on the other side. However, even if the machine room 39 is disposed at the rear of the display module 10, the closed circulation path 50 flows in the space behind the display module 10 and needs to cool the rear surface of the display module 10, so the machine room 39 ), a predetermined gap exists between the front face of the display module 10 and the rear surface of the display module 10, thereby allowing air to circulate.

The flow of air generated inside the machine room forms an open flow path 70 through which air outside the enclosure flows. In the cooling apparatus according to the present invention, the compressor 93 and the second heat exchanger 95 that generate heat are disposed inside the machine room 39 to be smoothly cooled by air passing through the open flow path. To this end, a second fan 72 is installed inside the machine room, and the second fan 72 is disposed on the long side of the display to generate air flow in the vertical direction.

On the other hand, in view of the fact that there are many restrictions on the space inside the enclosure, in the present invention, the expansion valve 97 is also disposed inside the machine room.

[Operation of cooling device]

Hereinafter, the operation of the display cooling device according to the present invention will be described. When the display is operated, heat is generated from the backlight unit or power circuit of the display module 10. When the first fan 51 disposed inside the enclosure 30 operates, air circulates in the closed circulation path 50 that circulates the front, rear and side surfaces of the display module 10 within the enclosure 30, and the display module It will absorb the heat of (10).

In addition, heat generated from the LED array 15 is conducted through the housing 16 and is almost directly transferred to the first heat exchanger 91.

The refrigerant inside the first heat exchanger 91 absorbs heat from the air in the closed circulation path, absorbs heat from the housing, and evaporates.

The gaseous refrigerant evaporated in the first heat exchanger is compressed by moving to the compressor 93 installed in the machine room. In addition, the high-pressure refrigerant is condensed in the second heat exchanger 95 to emit heat. The heat generated by the compressor 93 and discharged from the second heat exchanger 95 is introduced from the outside of the machine room by the second fan 72 to the air of the open flow path 70 flowing inside the machine room. Cooled by The air in the open flow path heated by cooling the compressor and the second heat exchanger is discharged to the outside of the machine room.

The liquid refrigerant condensed in the second heat exchanger passes through the expansion valve 97, flows back into the first heat exchanger, evaporates, and continues to cool the interior of the enclosure.

According to the present invention, by cooling the interior of the enclosure by using a heat pump type cooling device, heat exchange and cooling efficiency are much better than that of a conventional cooling method that relies on air-to-air surface contact. Therefore, sufficient cooling inside the enclosure is possible without increasing the size of the heat exchanger.

In addition, according to the cooling device of the heat pump method of the present invention, unlike the heat exchange method according to the conventional air-to-air contact method, the first heat exchanger and the second heat exchanger are respectively disposed inside and outside the enclosure to cool the interior of the enclosure. This is possible. This greatly increases the degree of freedom in display design.

As described above with reference to the drawings illustrated for the present invention, the present invention is not limited by the embodiments and drawings disclosed in the present specification, and various by a person skilled in the art within the scope of the technical idea of the present invention. It is obvious that transformations can be made. In addition, even if not explicitly described and described the operating effects according to the configuration of the present invention while describing the embodiments of the present invention, it is natural that the predictable effects by the configuration should also be recognized.

10: display module
11: Front (screen)
12: rear
15: backlight unit (LED array)
16: housing
30: enclosure
35: Front (transmissive surface, glass)
36: rear
37: substrate
38: insulation layer
39: machine room
50: pulmonary circulation pathway
51: first fan
70: open flow path
72: second fan
90: cooling system
91: first heat exchanger (evaporator)
911: pin 1
93: compressor
95: second heat exchanger (condenser)
952: second pin
97: expansion valve

Claims (10)

Enclosure 30 provided with a transmission surface on the front surface 35;
A display module 10 accommodated in the housing 30 and spaced apart from the front 35 and rear 36 of the housing;
The space between the front surface 35 of the housing 30 and the front surface 11 of the display module 10, the space between the side surface of the housing 30 and the side surface of the display module, and the rear surface 36 ) And a closed circulation path 50 for circulating the space between the rear surface 12 of the display module 10;
An open flow path 70 provided outside the enclosure 30; And
The heat absorbed by the refrigerant of the first heat exchanger 91 provided inside the enclosure 30 from the air circulating in the closed circulation path 50 is released from the second heat exchanger 95 provided outside the enclosure 30 Including; a cooling device 90;
The cooling device 90 is:
The first heat exchanger 91 through which the refrigerant evaporates;
A compressor (93) for compressing the refrigerant vaporized in the first heat exchanger (91);
A second heat exchanger (95) in which the high-temperature and high-pressure refrigerant compressed by the compressor (93) is condensed; And
Including; an expansion valve (97) disposed between the second heat exchanger (95) and the first heat exchanger (91),
The first heat exchanger 91 is disposed between a side surface of the display module 10 and a side surface of the housing 30 facing the display module 10,
A machine room 39 is provided outside the housing 30 at the rear of the housing 30,
The second heat exchanger (95) is arranged to extend in a direction parallel to the rear surface of the enclosure (30) in the machine chamber (39), and the air outside the enclosure flowing through the open flow path (70) flows through the ) Flows along the extension direction of the second heat exchanger 95 in a direction parallel to the rear surface 36 of the enclosure 30
Display cooling system.
The method according to claim 1,
A heat insulating layer 38 is provided between the machine room 39 and the inner space of the enclosure 30
Display cooling system.
The method according to claim 1,
The compressor 93 and the expansion valve 97 are disposed in the machine room.
Display cooling system.
The method according to claim 1,
A substrate 37 for controlling the display module 10 is installed on the rear surface of the housing 30,
The substrate 37 is provided in a position not overlapping with the machine room 39 at the rear surface of the enclosure 30.
Display cooling system.
The method according to claim 1,
A first fan 51 for pressurizing the air circulating in the closed circulation path 50 is installed in the enclosure.
Display cooling system.
The method according to claim 1,
The machine room (39) is provided with a second fan (72) forming an open flow path (70) through which air from outside the enclosure flows into the machine room.
Display cooling system.
The method according to claim 1,
The display module 10 is provided with a backlight unit 15,
The backlight unit 15 is installed adjacent to the housing 16 of the display module 10 to conduct heat to the housing 16,
The first heat exchanger 91 is installed adjacent to the housing 16
Display cooling system.
The method of claim 7,
The heating part of the backlight unit 15 is installed on the side of the display module 10,
The housing 16 is in contact with the heating part of the backlight unit and is installed on the side of the display module 10.
Display cooling system.
The method according to claim 1,
The first heat exchanger 91 includes a plurality of fins extending in a direction parallel to the air flow direction of the closed circulation path 50 passing through the first heat exchanger.
Display cooling system.
The method according to claim 1,
The second heat exchanger 95 includes a plurality of fins extending in a direction parallel to the air flow direction of the open flow path 70 passing through the second heat exchanger.
Display cooling system.

Images