JP5356093B2 - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display apparatus capable of solving a problem that a function is deteriorated and display is unable by cooling a display panel of a flat display to appropriate temperature. <P>SOLUTION: A cooling device 19 functioning as the cooling device of the image display apparatus includes: a refrigerant circuit 210 constituted by annularly connecting at least a refrigerant compressor 200, a condenser (radiator) 192, an expansion valve 203 functioning as a pressure reducing device and an evaporator 191 through a refrigerant pipe; fans for circulation 18 and 181 functioning as a blower for circulation configured to send air cooled in the evaporator 191 to a housing chamber 121 constituted inside a casing 12; and a controller 310 decreasing an amount of heat to be exchanged with the air with the evaporator 191 when the refrigerant circuit 210 results in an overload state. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an image display device, and more particularly to an image display device that can be installed outdoors.

  Conventionally, an image display device provided with a flat display having a display panel as a monitor for image display uses a liquid crystal panel as a display panel in this way, the depth is reduced, and the installation space can be reduced, There is an excellent feature that the image resolution is high and the image can be clearly displayed.

  Therefore, in recent years, there has been a strong demand to install this type of image display device outdoors, for example, in a narrow place such as an outer wall of a building or a bus stop. However, the conventional image display device is designed on the assumption that it is installed indoors, and since measures to protect the display from wind and rain, dust and the like are not taken, it has been difficult to install it outdoors.

  Therefore, the display screen of a liquid crystal display panel that is vulnerable to wind and rain and dust is housed in a waterproof casing that is visible from the outside, eliminating damage to the panel caused by such wind and rain and allowing it to be installed outdoors. Image display devices have also been developed (see, for example, Patent Document 1).

2005-286987

  However, when the image display panel is accommodated in the casing, there is no escape path from the inside of the casing to the outside, and therefore the image display panel cannot be naturally cooled. For this reason, a phenomenon (so-called blackout) occurs in which the temperature of the display panel rises due to heat or sunlight generated from the image display panel during operation, the original function of the liquid crystal deteriorates, and the image display becomes impossible. End up.

  The present invention has been made to solve the conventional technical problems, and can cool the display panel of the flat display to an appropriate temperature to solve the problem that the function is deteriorated and display becomes impossible. An object of the present invention is to provide an image display device that can be used.

An image display device according to the present invention includes a flat display having a display panel, a casing that accommodates the flat display, and the display screen of the display panel is visible from the outside, and is disposed below the casing. And a cooling device for sending air for cooling the flat display, and the cooling device is formed by connecting at least a refrigerant compressor, a radiator, a decompression device, and an evaporator in a ring shape with a refrigerant pipe. A refrigerant circuit, a circulation blower for sending air cooled by an evaporator into the casing, and at least when the temperature of the radiator rises to a first value or more, or the temperature of the evaporator is a second value if it meets either when rises above, further comprising a control device for reducing the blowing rate of air by the circulating blower is determined that the refrigerant circuit is overloaded And features.

The invention of claim 2 includes a radiator blower for blowing outside air to the radiator in the above invention , and the control device is at least when the temperature of the radiator is lowered to a third value or less, or the temperature of the evaporator If any of the above is reduced to the fourth value or less, the refrigerant circuit is judged to be in a light load state, and the amount of air blown to the radiator by the blower for radiator is reduced. To do.

According to a third aspect of the present invention, there is provided an outside air temperature sensor for detecting the temperature of the outside air in each of the above inventions , and the control device stops the operation of the refrigerant compressor when the temperature detected by the outside air temperature sensor exceeds a predetermined range. It is characterized by doing.

According to a fourth aspect of the invention, there is provided a display temperature sensor for detecting the temperature of the flat display in each of the above-mentioned inventions , and the control device turns on / off the operation of the refrigerant compressor so that the detected temperature of the display temperature sensor becomes a set temperature. Control is performed and the set temperature is changed so that the night becomes higher than the daytime.

  According to the present invention, a flat display having a display panel, a casing that accommodates the flat display and that allows the display screen of the display panel to be visually recognized from the outside, and disposed below the casing, An image display device comprising a cooling device for sending air for cooling a flat display, wherein the cooling device is a refrigerant circuit in which at least a refrigerant compressor, a radiator, a decompression device, and an evaporator are annularly connected by a refrigerant pipe. And a circulation blower that sends the air cooled by the evaporator into the casing, the air cooled by the evaporator is circulated in the casing by the circulation blower, and the heat generated in the display panel is generated. This circulating air can be guided to the evaporator of the cooling device as a medium and recovered by the evaporator. As a result, the temperature rise of the display panel can be eliminated or suppressed.

  In particular, by providing a control device that reduces the amount of heat exchange between the evaporator and air when the refrigerant circuit reaches an overload state, the evaporation of the refrigerant in the evaporator occurs when the refrigerant circuit reaches an overload state. The temperature rises, the air cannot be cooled in the evaporator, and the high-temperature air is circulated in the casing, so that the disadvantage that adversely affects the heat dissipation of the display panel can be eliminated or suppressed.

  This makes it possible to achieve protection when the cooling device is overloaded, which prevents the display panel of the flat display from running away.

In particular, the control device causes the refrigerant circuit to exceed when either the radiator temperature rises above a first value or when the evaporator temperature rises above a second value. Since it determines that it is a load state and reduces the ventilation volume of the air by the ventilation apparatus for circulation, protection at the time of an overload can be achieved exactly by the temperature of a radiator.

According to the invention of claim 2, in the above invention , the radiator is provided with a radiator blower for blowing outside air, and the control device is at least when the temperature of the radiator is decreased to a third value or less, or the evaporator Since the refrigerant circuit is judged to be in a light load state and the amount of air blown to the radiator by the radiator blower is reduced, if any of the above temperature drops below the fourth value is satisfied, Depending on the temperature of the radiator, protection at light loads can be achieved accurately.

According to the invention of claim 3, in each of the above-mentioned inventions , an outside air temperature sensor for detecting the temperature of outside air is provided, and the control device operates the refrigerant compressor when the detected temperature of the outside air temperature sensor exceeds a predetermined range. Therefore, protection at light load can be achieved accurately by the outside air temperature.

According to the invention of claim 4, in each of the above-mentioned inventions , a display temperature sensor for detecting the temperature of the flat display is provided, and the control device operates the refrigerant compressor so that the detected temperature of the display temperature sensor becomes the set temperature. The on / off control is performed and the set temperature is changed so that the night becomes higher than the daytime, so that frequent on / off of the refrigerant compressor at night can be eliminated. Thereby, protection of the refrigerant compressor can be achieved.

[BRIEF DESCRIPTION OF THE DRAWINGS] It is a perspective view of the image display apparatus of one Example to which this invention is applied. It is a disassembled perspective view of the image display apparatus of FIG. It is a figure which shows the IV-IV cross section of the image display part of FIG. It is a figure which shows the cross section cut | disconnected by the broken line XI of FIG. It is an enlarged view of the XIV area | region of FIG. It is a refrigerant circuit figure of a cooling device. It is a front view of a cooling device. It is a rear view of a cooling device. It is a right view of a cooling device. It is a left view of a cooling device. It is the perspective view which looked at the cooling device from the front upper part. It is the perspective view which looked at the cooling device from the back upper surface. It is a figure which shows the state which attached the cover to the compressor unit of the cooling device of FIG. It is the front view which showed the image display apparatus of FIG. 1 schematically. FIG. 2 is a rear view schematically showing the image display device of FIG. 1. It is a block diagram of the control apparatus of a cooling device. It is a flowchart which shows the control action of the control apparatus of FIG.

  Hereinafter, embodiments of an image display device of the present invention will be described in detail with reference to the drawings.

(1) Outline of Image Display Device FIG. 1 is a perspective view of an image display device according to an embodiment to which the present invention is applied, and FIG. 2 is an exploded perspective view of the image display device of FIG. The image display apparatus according to the present embodiment has a flat rectangular parallelepiped appearance, and includes an image display unit 1, a support base 2, a back plate 3, a cover 4, a lighting fixture 5, and a pair of ventilation plates 6 and 6. Prepare. The image display unit 1 is for projecting an image on the surface 101 of the liquid crystal display device, and includes a liquid crystal display described later. Details of the image display unit 1 will be described later.

  The support base 2 is for supporting the image display unit 1 and the back plate 3. A frame portion 21 for attaching the image display portion 1 and the back plate 3 is formed on the support base 2, and the image display portion 1 and the back plate 3 can be fitted into the frame portion 21.

  The back plate 3 is fitted into the frame portion 21. The back plate 3 is disposed on the back side of the image display unit 1, and the surface 31, that is, the surface on the back surface 102 side of the image display device can be used as an installation base on which an advertisement is pasted.

  The back plate 3 is made of a light-transmitting material and is configured to transmit light generated from the lighting fixture 5. Similarly, the advertising matter affixed to the back plate 3 is also made of a light-transmitting material capable of transmitting the light generated from the lighting fixture 5. In the following, an advertisement made of this light transmissive material is referred to as an advertisement film.

  The cover 4 is attached to the support base 2 so as to be openable and closable, and is configured so as to be able to cover the surface 31 of the back plate 3 to which the advertisement is pasted in the closed position. As a result, the advertising film attached to the surface 31 of the back plate 3 is protected by the cover 4. Moreover, the part which opposes the surface 31 of the backplate 3 of the said cover 4 is comprised with the material which has a light transmittance. Thereby, it becomes possible to visually recognize the advertisement from the back surface 102 side of the image display device.

  Furthermore, the lighting fixture 5 is a fixture for illuminating an advertising film attached to the surface 31 of the back plate 3, and is composed of a plurality of fluorescent lamps extending in a substantially vertical direction. The lighting fixture 5 is attached to the frame portion 21 of the support base 2 in a state of being disposed between the image display portion 1 and the back plate 3. By illuminating the advertising film with the lighting fixture 5, it is possible to visually recognize characters printed on the advertising film even at night. In addition, the specific attachment position where the lighting fixture 5 is arrange | positioned is explained in full detail behind.

  Furthermore, the pair of ventilation plates 6 and 6 are arranged one by one on the front surface 101 and the back surface 102 of the image display device at a position below the image display unit 1. The pair of ventilation plates 6, 6 are formed with a plurality of ventilation holes 61 that communicate the inside and the outside of the machine room 195 of the image display device.

(2) Image Display Unit Next, the above-described image display unit 1 will be described. 3 is a diagram in which the image display unit 1 is cut along the IV-IV broken line shown in FIG. 2, and the cross section is seen from the arrow direction. FIG. 4 is a diagram in which the cross section cut along the broken line XI shown in FIG. Respectively.

  The image display unit 1 includes a liquid crystal display 10, a housing (casing of the present invention) 12, a plurality of heat pipes 13, a circulation fan 18, heat radiation fins 14, ventilation fans 15 and 16, heat collection fins 17, and a cooling device 19. , A circulation fan 181, a heat insulating member 7, and heat collecting fins 71 for the circuit board and a blower fan 72.

<Liquid crystal display 10>
The liquid crystal display 10 is a flat display and includes a display panel 11 that displays an image. The display panel 11 is provided inside a storage chamber 121 configured in the housing 12. The display panel 11 is arranged so that the display screen 112a corresponds to the surface 101 of the image display device. Further, a circuit board 11e of the control means C of the image display device is provided on the back surface of the back wall 125 of the housing 12 that forms the housing chamber 121.

  In the display panel 11, the surface 112 including the display screen 112a tends to generate heat and become high temperature. In the present embodiment, a vertically long rectangular shape that can be arranged in a narrow place is used as the display panel 11, but the display panel is not limited to the shape of the embodiment in the present invention. Various shapes can be applied depending on the application.

<Case 12>
(Containment room)
The housing 12 has a waterproof structure, and a storage chamber 121 is formed therein. The display panel 11 is provided inside the storage chamber 121.

  Specifically, the housing 12 of the present embodiment has a surface wall 124 positioned on the surface 112 side of the display panel 11, a back wall 125 positioned on the back surface 111 side of the display panel 11, and a surface side of the display panel 11. It is comprised by the side wall 121a, 12b located, the upper surface wall 127 located in the upper end surface 113 side of the display panel 11, and the lower surface wall 128 (refer FIG. 5) located in the lower end surface 114 of the display panel 11. FIG. And the storage chamber 121 is comprised by the said surface wall 124, this back wall 125, both-side wall 121a, 121b, the upper surface wall 127, and the lower surface wall 128 of this housing | casing 12, The inside of this storage chamber 121 is sealed with these each wall, or It is a substantially sealed space. FIG. 5 is an enlarged view of a region indicated by a broken line XIV shown in FIG.

  In this manner, the interior of the storage chamber 121 is configured to be a sealed or substantially sealed space, and the display panel 11 is stored in the interior of the storage chamber 121 (that is, the sealed or substantially sealed space). Thus, even when the image display device is installed outdoors, the display panel 11 can be protected from wind and rain and dust.

  Further, in this embodiment, as shown in FIG. 4, the back wall 125 is disposed between the display panel 11 and the back plate 3 and is separated from the back surface 111 of the display panel 11. As described above, by installing the back wall 125 away from the display panel 11, it is difficult for heat generated in the display panel 11 to be transmitted to the back wall 125. For this reason, since the heat of the display panel 11 is hardly transmitted to the circuit board 11e disposed on the back surface of the back wall 125, the problem that the circuit board 11e is damaged due to the temperature rise due to the heat of the display panel 11 can be solved. it can.

  Further, the surface wall 124 is formed of a material having a light-transmitting portion at the portion facing the display screen 112a of the display panel 11, in this embodiment, a glass material. The surface of the surface wall 124 becomes the surface 101 of the image display device. Therefore, the display screen 112a of the display panel 11 can be viewed from the front surface side of the housing 12, that is, the front surface 101 side of the image display device.

(About the circulation channel)
As shown in FIG. 4, a circulation channel 92 is formed inside the accommodation chamber 121. The circulation channel 92 is a channel formed so as to surround the display panel 11. In FIG. 4, the heat pipe 13 and the heat collection fins 17 are not shown in order to clarify the circulation flow path 92. Also in FIG. 5, the illustration of the heat pipe 13 and the heat collecting fins 17 is omitted.

  The circulation channel 92 of the present embodiment is between the surface wall 124 of the housing 12 and the surface 112 of the display panel 11 and extends along the surface 112 in a substantially vertical direction, Between the flow path portion 11b formed between the upper surface wall 127 of the housing 12 and the upper end surface 113 of the display panel 11, and between the back wall 125 of the housing 12 and the back surface 111 of the display panel 11, The flow path portion 11c extends in the substantially vertical direction along the back surface 111, and the flow path portion 11d formed between the lower surface wall 128 of the housing 12 and the lower end surface 114 of the display panel 11. It is configured by sequentially connecting the road portions 11a to 11d in an annular shape.

  That is, the flow path part 11a and the flow path part 11c have their upper ends communicated with each other through the flow path part 11b and their lower ends communicated with each other through the flow path part 11d.

  The flow path portion 11a has a width W (see FIG. 4; corresponding to W1 in FIG. 4) in a direction perpendicular to the direction in which the surface 112 of the display panel 11 extends (corresponding to the horizontal direction in this embodiment). The width W of the flow path portion 11c is smaller than the width W (corresponding to W2 in FIG. 4). In the embodiment, the width W of the flow path portion 11a is about 10 mm. Also, the width W (width in the vertical direction in the present embodiment) of the flow channel portion 11b and the flow channel portion 11d is set to about 10 mm as in the flow channel portion 11a.

  Then, the air in the circulation channel 92 is circulated in the circulation channel 92 surrounding the display panel 11 by the circulation fans 18 and 181 described later. As a result, the heat generated on the display screen 112 a of the display panel 11 moves to the back surface 111 side of the display panel 11 through the air circulating in the circulation flow path 92.

(About air passage)
Inside the housing 12 and outside the storage chamber 121, air passages 122 and 123 that communicate with the outside of the housing 12 are formed. As shown in FIG. 3, the air passage 122 extends in a substantially vertical direction along one side wall 121 a that forms the storage chamber 121, and the air passage 123 forms the other side wall that forms the storage chamber 121. It extends in a substantially vertical direction along 121b. Thus, by forming the air passages 122 and 123 on both sides of the storage chamber 121, the image display unit 1 is increased in size in the thickness direction (that is, the width direction of the flow path portions 11a and 11c in FIG. 4). It can be avoided.

  The upper end portion 122 a of the air passage 122 is bent in a crank shape, and communicates with the outside of the housing 12 through a vent hole (not shown) provided in the upper surface 21 a of the frame portion 21 of the support base 2. The upper end portion 123 a of the air passage 123 is configured similarly to the upper end portion 122 a of the air passage 122.

<Heat pipe 13>
On the other hand, a plurality of heat pipes 13 are provided on the back surface 111 of the display panel 11. The plurality of heat pipes 13 are positioned in the flow path portion 11c of the circulation flow path 92, and are fixed in a state where a plurality of heat pipes 13 are arranged at predetermined intervals in the substantially vertical direction of the back surface 111 of the display panel 11. . In this embodiment, one set of heat pipes 13 is provided at predetermined equal intervals in the vertical direction so as to form a pair with the center line 111a of the back surface 111 shown in FIG. The heat pipe 13 is filled with a heat exchange medium such as refrigerant or water.

  The heat pipes 13 arranged on the air passage 122 side of the center line 111a shown in FIG. 3 extend from one end located near the center line 111a on the back surface 111 of the display panel 11 toward the air passage 122, and The other end of the housing 12 passes through the side wall 121 a of the housing 12 and is located inside the ventilation path 122 that is outside the storage chamber 121. That is, the heat pipe 13 is disposed so as to protrude from the inside of the accommodation chamber 121 into the ventilation path 122.

  Specifically, a through-hole (not shown) is formed in the side wall 121a forming the storage chamber 121, and the heat pipe 13 is inserted into the through-hole so that the inside of the ventilation path 122 from the inside of the storage chamber 121. It is comprised so that it may extend.

  An annular seal member (not shown) such as silicon rubber is fitted into the heat pipe 13. When the heat pipe 13 is inserted into the through hole, the heat pipe 13 is sealed by the sealing member, and thereby, the sealed state inside the storage chamber 121 or the substantially sealed state is maintained. .

  On the other hand, the heat pipes 13 arranged on the air passage 123 side of the center line 111a shown in FIG. 3 are similar to the heat pipe 13 extending to the air passage 122 from the one end located near the center line 111a. It extends toward the side, penetrates the side wall 121 b of the housing 12, and the other end is located inside the ventilation path 123 that is outside the storage chamber 121.

  By providing the heat pipe 13 as described above, heat generated from the display panel 11 by the heat pipe can be recovered inside the storage chamber 121. That is, the heat pipe 13 can recover heat from the air flowing through the circulation channel 92 and can directly recover the heat of the display panel 11 from the back surface 111. And the collect | recovered heat is guide | induced to the outer side of the storage chamber 121 with a heat pipe, and is discharge | released inside the ventilation paths 122 and 123, respectively. Accordingly, the heat pipe 13 functions as a heat exchanging means provided in the image display unit 1.

  The heat released from the heat pipe 13 into the air passages 122 and 123 is dissipated outside the housing 12 through the air passages 122 and 123. That is, the ventilation paths 122 and 123 function as heat recovery means for recovering heat from the heat pipe 13 outside the storage chamber 121. Thereby, the temperature rise of the display panel 11 can be suppressed.

  In the present embodiment, since a plurality of heat pipes 13 are provided in the up and down direction of the back surface 111 of the display panel 11 at predetermined equal intervals, the heat from the entire flow path portion 11c of the circulation flow path 92 is provided. The heat can be recovered from the entire back surface 111 of the liquid crystal display 10. Thereby, the cooling efficiency of the image display part 1 can be improved.

<Cooling device 19>
2, 4 and 5, reference numeral 19 denotes a cooling device of the present invention. The cooling device 19 is provided for recovering the heat generated in the display panel 11 as with the heat pipe 13. Specifically, the cooling device 19 is for sending air for cooling the display 10 (display panel 11) into the accommodation chamber 121 to cool the display panel 11 to an appropriate temperature. As shown in FIG. 5, the cooling device 19 is disposed below the image display unit 1. The cooling device 19 includes at least a refrigerant compressor 200, a condenser (heat radiator) 192, a decompression device 203, a refrigerant circuit 210 formed by connecting an evaporator 191 in a ring shape with refrigerant piping, and air cooled by the evaporator 191. Is supplied to the housing 12 and a control device 310 is provided.

(I) Configuration The cooling device 19 according to the present embodiment includes a compressor unit 197 and a condenser unit 198 provided in a machine chamber 195 formed in the housing 12 outside (lower) the storage chamber 121, and the machine The cooling unit 199 provided in the storage chamber 121 on the upper side of the chamber 195 and the circulation fans 18 and 181 and the ventilation fan 72 provided in the housing 12 respectively. Consists of a blower. The compressor unit 197 includes a refrigerant compressor 200, a receiver tank 201, a filter dryer 202, service valves 212 and 213, an accumulator 205, and a check valve 206, and a condenser (heat radiator) 192 of the condenser unit 198 and a cooling unit. The refrigerant pressure compressor 200, the receiver tank 201, the filter dryer 202, the service valves 212 and 213, the accumulator 205, and the check valve 206 are connected to the expansion unit 203 and the evaporator 191 as pressure reducing devices of the unit 198. A predetermined refrigerant circuit 210 is configured together with the condenser 192, the expansion valve 203 of the cooling unit 199, the evaporator 191 and the like.

  Here, the cooling device 19 will be described in detail. 6 is a refrigerant circuit diagram of the cooling device 19, FIG. 7 is a front view of the cooling device 19, FIG. 8 is a rear view of the cooling device 19, FIG. 9 is a right side view, FIG. 10 is a left side view, and FIGS. FIG. 13 is a perspective view of the cooling device 19 (FIG. 13 is a perspective view showing a state where the cover 197A is attached to the compressor unit 197). In FIG. 6, only the circulation fan 181 of the circulation blower is shown, and the other circulation blowers (circulation fan 18 and blower fan 72) are not shown. In FIGS. Although the circulation blower is not shown, the circulation blower also constitutes a part of the cooling device 19.

  The refrigerant compressor 200 is a horizontal refrigerant compressor including a driving element (not shown) in a horizontally long cylindrical sealed container 200A and a compression element driven by the driving element. One end of a refrigerant discharge pipe 221 is connected to the discharge side of the refrigerant compressor 200, and high-temperature and high-pressure refrigerant gas compressed by a compression element in the sealed container 200 </ b> A is discharged from the refrigerant discharge pipe 221 to the outside of the compressor 200. Is done. A refrigerant suction pipe 220 is connected to the suction side of the refrigerant compressor 200.

  The other end of the refrigerant discharge pipe 221 is connected to the inlet of the condenser 192 of the condenser unit 198. The condenser 192 is a fin-and-tube heat exchanger configured such that a refrigerant pipe is inserted in a meandering manner through a plurality of heat exchange fins made of an aluminum thin plate or the like. Corresponding to the condenser 192, two heat dissipating fans 193 serving as a radiator blower are arranged in parallel. Both the heat dissipating fans 193 are for cooling the air by passing outside air through the condenser 192.

  The refrigerant pipe 222 connected to the outlet of the condenser 192 is connected to one end of the service valve 212 via the receiver tank 201 and the filter dryer 202 of the compressor unit 197. The refrigerant pipe 223 connected to the other end of the service valve 212 is connected to the inlet of the expansion valve 203 of the cooling unit 198, and the refrigerant pipe 224 connected to the outlet of the expansion valve 203 is connected to the inlet of the evaporator 191. It is connected to the. The evaporator 191 is configured by arranging a plurality of heat exchange fins 191F with a predetermined interval between a pair of tube plates 191A, and inserting a refrigerant pipe 191R into the tube plates 191A and the heat exchange fins 191F in a meandering manner. This is a fin-and-tube heat exchanger. In the vicinity of the evaporator 191, a circulation fan 181 is disposed as a circulation air blower for sending the air cooled by the evaporator to the storage chamber 121.

  The refrigerant pipe 225 connected to the outlet of the evaporator 191 is connected to one end of the service valve 213 of the condensing unit 197, and the refrigerant pipe 226 connected to the other end of the service valve 213 is connected to the inlet of the accumulator 205. It is connected to the. The refrigerant introduction pipe 220 of the refrigerant compressor 200 is connected to the outlet of the accumulator 205, and the refrigerant introduction pipe 220 is connected to the suction side of the refrigerant compressor 200 via a check valve 206.

  One end of a bypass pipe 227 for returning the refrigerant in the receiver tank 202 to the compressor 200 is connected to the refrigerant pipe 222 positioned between the filter dryer 202 and the service valve 210. The other end of the bypass pipe 227 is connected to the sealed container 200A of the compressor 200 and opens in the sealed container 200A. In this bypass pipe 227, the solenoid valve 207 for controlling the flow of the refrigerant returning to the sealed container 200A of the compressor 200 via the bypass pipe 227 and the refrigerant returning to the sealed container 200A are reduced to a predetermined pressure. For this purpose, a capillary tube 208 is provided.

  Further, a temperature sensing cylinder 209 is attached in the vicinity of the outlet of the evaporator 191 of the refrigerant pipe 225. The temperature sensing cylinder 209 is for adjusting the opening of the expansion valve 203 according to the refrigerant temperature discharged from the evaporator 191.

(Ii) Arrangement The cooling device 19 having the above-described configuration is arranged below the liquid crystal display unit 1. Specifically, the cooling unit 199 is disposed in the circulation flow path 92 near the lower end surface 114 of the display panel 11 on the back surface 111 side of the display panel 11 inside the storage chamber 121. Thus, the circulation flow path 92 can be shortened by disposing the cooling unit 199 including the evaporator 191 on the back surface 111 side of the display panel 11. The cooling unit 199 is not limited to the position of the present embodiment. For example, the cooling unit 199 is disposed below the display panel 11, that is, in the flow path portion 11 d of the circulation flow path 92 on the lower end surface 114 side of the display panel 11. You may arrange.

  On the other hand, the compressor unit 197 and the condenser unit 198 are provided in a machine room 195 formed at a position below the cooling unit 199 and outside (downside) the storage chamber 121. It is mounted on a unit base 300 that forms the bottom.

  The machine room 195 is configured in a space having a substantially rectangular parallelepiped shape surrounded by the lower surface wall 128 of the housing 12, the unit base 300, and the pair of ventilation plates 6 and 6. In the machine room 195, as described above, the compressor unit 197 and the condenser unit 198 are provided. The compressor unit 197 and the capacitor unit 198 are disposed adjacent to the left and right (lateral direction) in the machine room 195 having a horizontally long rectangular parallelepiped shape. The compressor unit 197 disposed on one side of the machine room 195 (on the one end 300L side of the unit base 300) is configured in a cover 197A that forms an outer shell as shown in FIG.

  Specifically, the horizontal refrigerant compressor 200 is arranged such that the head of the horizontally long cylindrical sealed container 200A is on the one end 300L side of the unit base 300 opposite to the capacitor unit 198 and the bottom is on the capacitor unit 198 side. In this state, it is fixed on the unit base 300 via the vibration isolation member 200B. In the compressor unit 197, a receiver tank 201 and a filter dryer 202 are juxtaposed in the front-rear direction on the condenser unit 198 side of the refrigerant compressor 200, that is, between the refrigerant compressor 200 and the condenser unit 198. Specifically, the filter dryer 202 is provided on the front (front) 300S side between the refrigerant compressor 200 and the condenser unit 198, and the receiver tank 201 is installed on the other rear (back) 300R side.

  The refrigerant compressor 200 and the capillary tube 208 are juxtaposed in the front-rear direction on one end 300L side opposite to the condenser unit 198 of the unit base 300 where the receiver tank 201 and the filter dryer 202 are located. The refrigerant compressor 200 is provided at a substantially central position in the front-rear direction, and the capillary tube 208 is installed alongside the refrigerant compressor 200 on the back surface 300R side.

  An accumulator 205 and service valves 212 and 213 are juxtaposed in the front-rear direction at one end 300L of the unit base 300 opposite to the condenser unit 198 of the refrigerant compressor 200. Specifically, the accumulator 205 is provided on the front surface 300S side of one end of the unit base 300, the service valve 212 is provided on the back surface 300R adjacent to the accumulator 205, and the service valve 212 is provided on the back surface 300R of the service valve 212. A service valve 213 is installed adjacent to the valve 212.

  Further, an electrical box 228 is installed between the accumulator 205 and the compressor 200 on the unit base 300 on the front side 300S, and a control board of a control device 310 (to be described later) is built in the electrical box 228. Has been.

  On the other hand, a capacitor unit 198 is provided on the other side of the machine room 195. The capacitor unit 198 is arranged in parallel with the compressor unit 197 disposed in one side of the machine room 195. The capacitor unit 198 includes a condenser 192 and two heat dissipating fans 193. These are provided side by side in the front-rear direction of the unit base 300. Specifically, the condenser 192 is installed on the front surface 300S side of the unit base 300, which is on the ventilation plate 6 side located on the front surface 101 of the image display device, and the two heat dissipating fans 193 are located on the rear surface 102. The unit base 300 on the plate 6 side is provided side by side along the condenser 192 provided on the front surface 300S side on the back surface 300R side.

  Both heat dissipating fans 193 are arranged such that the direction of ventilation of the fans 193 through the condenser 192 is orthogonal to the direction in which the refrigerant pipes inserted through the plurality of heat exchange fins extend. In this case, when the heat dissipating fan 193 is operated, as indicated by an arrow D in FIG. 4, an external port 61 is formed in the machine room 195 from the vent 61 formed in the vent plate 6 located on the front surface 101 of the image display device. Air is inhaled. The outside air sucked into the machine room 195 passes through the condenser 192 and is then sucked into the heat radiating fan 193, and then the vent 61 formed in the vent plate 6 located on the back surface 102 of the image display device. From the machine room 195 to the outside. As a result, the refrigerant is recovered in the evaporator 191, and the heat in the storage chamber 121 (that is, the heat of the display panel 11) conveyed to the condenser 192 through the refrigerant circuit 210 is transferred from the heat radiating fan 193 to the condenser 192. Heat exchange with the outside air to be ventilated allows efficient discharge to the outside of the image display device.

  In the present embodiment, as described above, air (outside air) outside the image display device is sucked from the vent 61 of the ventilation plate 6 located on the front surface 101 of the image display device, and the ventilation plate 6 located on the back surface 102. The air is exhausted from the vent 61 to the outside of the image display device. That is, in the present embodiment, the vent 61 of the vent plate 6 located on the front surface 101 of the image display device is used as an intake port, and the vent 61 of the vent plate 6 located on the back surface 102 is used as an exhaust port. It will be.

  On the other hand, the cooling unit 199 is disposed inside the storage chamber 121 above the machine chamber 195 as described above and below the flow path portion 11c of the circulation flow path 92. A lower surface wall 128 is provided between the cooling unit 199 and the machine room 195 disposed in the storage chamber 121, and the cooling unit 198 and the compressor unit 197 located in the machine room 195 are connected to the lower surface wall 128. The refrigerant pipe 223 and the refrigerant pipe 225 are inserted into a hole (not shown) penetrating up and down. Further, an annular seal member (not shown) such as silicon rubber is fitted in the refrigerant pipe 223 and the refrigerant pipe 225. And if the refrigerant | coolant piping 223 and the refrigerant | coolant piping 225 are penetrated in the said hole formed in the lower surface wall 128, between a hole and each refrigerant | coolant piping 223,225 will be sealed by this sealing member. Thereby, the sealed state or the substantially sealed state inside the storage chamber 121 is maintained, and the heat in the machine chamber 195 is hardly transmitted to the storage chamber 121 as much as possible.

  Further, as in the present embodiment, the cooling unit 199 is disposed below the flow path portion 11 c of the circulation flow path 92 formed between the back surface 111 and the back wall 125 of the display panel 11 inside the storage chamber 121. Thus, since the region near the lower end of the back wall 125 is cooled by the evaporator 191 of the cooling unit 199, it is possible to recover the heat generated in the circuit board 11e disposed on the back surface of the back wall 125. Accordingly, it is possible to recover the heat generated in the circuit board 11e by using the evaporator 191 that recovers the heat generated from the display panel 11. The cooling of the circuit board 11e using the circuit board heat collecting fins 71 and the blower fan 72 will be described in detail later.

  In this embodiment, the ventilation plates 6 and 6 and the housing 12 are separate members and the ventilation holes 61 and 61 are formed in the ventilation plates 6 and 6. However, the ventilation plate 6 is not provided. In addition, the housing 12 may be provided to extend to the unit base 300, and the ventilation hole 61 may be formed in the housing 12.

(Iii) Circulation Fan On the other hand, circulation fans 18 and 181 are provided in the circulation channel 92. The circulation fans 18 and 181 are circulation fans for sending the air cooled by the evaporator 191 into the housing 12. Specifically, the circulation fans 18 and 181 are provided for circulating the air cooled by the evaporator 191 to the circulation flow path 92 surrounding the display panel 11 in the storage chamber 121.

  The circulation fan 18 is installed on the rear surface 111 side of the display panel 11 and in the vicinity of the upper end surface 113 of the display panel 11. That is, the circulation fan 18 is installed at the upper end portion of the flow path portion 11 c of the circulation flow path 92. The circulation fan 18 sucks air in the flow channel portion 11 c of the circulation flow channel 92 from above the circulation fan 18 and discharges the sucked air to the flow channel portion 11 c below the circulation fan 18. It is configured as follows.

  On the other hand, the circulation fan 181 is installed in the vicinity of the evaporator 191 on the back surface 111 side of the display panel 11 as shown in FIG. In this embodiment, the circulation fan 181 is disposed above the evaporator 191 at the lower end of the flow path portion 11 c of the circulation flow path 92. As shown in FIG. 5, the circulation fan 181 sucks air in the flow path portion 11 c above the circulation fan 181 and evaporates the sucked air provided below the circulation fan 181. It is comprised so that it may discharge toward the container 191. Therefore, by driving the circulation fan 181, an air flow as shown by an arrow in FIG. 5 is formed in the circulation flow path 92.

  Thus, the circulation fans 18 and 181 form an air flow that circulates clockwise around the display panel 11 in the circulation channel 92 as shown in FIG. That is, by driving the circulation fans 18 and 181, the air in the flow path portion 11 a formed along the surface 112 of the display panel 11 rises in a substantially vertical direction from the bottom to the top. The air that has flown and has reached the upper end of the flow path part 11a flows into the flow path part 11b formed along the upper end surface 113 of the display panel 11, and the flow path part 11b passes through the back side, that is, the flow path part. After flowing toward the 11c side, it flows into the flow path portion 11c formed along the back surface 111. Then, the air that has entered the flow path portion 11c flows in the flow path portion 11c so as to descend in a substantially vertical direction from the top to the bottom as shown in FIG. The air is repeatedly circulated through the flow path portion 11d formed along the lower end surface 114 of the gas, passing through the flow path portion 11d toward the surface side, that is, toward the flow path portion 11a, and returning to the flow path portion 11a. It is.

  As described above, by providing the circulation fans 18 and 181, the air in the flow path portion 11 a formed along the surface 112 of the display panel 11 is flowed along the back surface 111 of the display panel 11. It can be efficiently guided to the portion 11c. Therefore, the heat generated on the display screen 112a of the display panel 11 is guided to the heat pipe 13 provided on the back surface 111 side of the display panel 11 and the evaporator 191 of the cooling unit 199 using air as a medium, and the heat pipe 13 and the evaporation. The container 191 enables efficient collection. That is, by circulating air in the circulation channel 92, the display panel 11, particularly the display screen 112a of the display panel 11, can be air-cooled. As a result, it is possible to suppress the temperature rise of the display panel 11, in particular, the temperature rise of the display screen 112a that easily generates heat, and as a result, the function of the display panel can be maintained in a good state.

  Further, heat generated in the circuit board 11e attached to the back surface of the back wall 125 is also transmitted from the back surface of the back wall 125 to the surface, and further from the surface to the air circulating in the circulation flow path 92, so that the heat pipe 13 And the circuit board 11e can be cooled.

  In particular, in this embodiment, since the air is directly discharged toward the evaporator 191 by the circulation fan 181 provided in the vicinity of the upper portion of the evaporator 191, the air in the circulation flow path 92 is removed. The air can be blown to the evaporator 191 without stagnation in the flow path portion 11c. Thereby, heat can be efficiently recovered by the evaporator 191.

  Further, in this embodiment, the circulation fans 18 and 181 are respectively disposed at the upper end and the lower end of the flow path portion 11c, so that air can easily circulate in the circulation flow path 92 and the flow rate is large. Will be able to. Thereby, the display panel 11 can be uniformly cooled, and the inconvenience that only a part of the display panel 11, particularly, a part adjacent to the evaporator 191 is extremely cooled can be solved.

  In the present embodiment, as shown in FIG. 3, ten circulation fans 18 are provided at the upper end of the flow passage portion 11c, and three circulation fans 181 are provided at the lower end of the flow passage portion 11c. Is preferably deployed. The operation of the circulation fan 181 is controlled by a control device 310 of the cooling device 19 described later.

  Further, in the present embodiment, the flow from the flow path portion 11a on the display screen 112a side constituting the circulation flow path 92 to the flow path portion 11c on the opposite side, that is, air flows from the bottom to the top on the display screen 112a side. The display screen 112a side with the large temperature rise is cooled first by the cool air immediately after the heat exchange in the evaporator 191, flowing from the top to the bottom of the part 11c, and then the opposite side of the display screen 112a with the small temperature rise. The flow path portion 11c is configured to be cooled. Therefore, the high-temperature display screen 112a side is effectively cooled, and both the side surfaces are cooled by the evaporator 191 as described above, and the air whose temperature has risen is cooled again to effectively exchange heat in the evaporator 191. It can be carried out.

  Furthermore, in the present embodiment, the circulation fan 18 is changed from the flow path portion 11b formed along the upper end portion of the flow path portion 11c of the circulation flow path 92, that is, the upper end surface 113 of the display panel 11, to the flow path portion 11c. It is installed at or near the position where air flows in, and the air sucked by the circulation fan 18 is discharged toward the flow path portion 11c below the circulation fan 18, so that the circulation The air in the flow path 92 can be circulated efficiently.

  That is, the circulation flow path 92 of the present embodiment includes a circulation fan 18 that circulates air using the circulation fan 18 disposed above the flow path portion 11c and the evaporator 191 disposed below the flow path portion 11c. 181 is used to circulate air.

  In addition, when the circulation fan 18 is installed at a position where it flows into the flow path portion 11b or in the vicinity thereof, the height direction of the image display portion 1 is enlarged accordingly. Therefore, by arranging the circulation fans 18 and 181 as in the present embodiment on the back surface 111 side of the display panel 11, it is possible to avoid the image display unit 1 from being enlarged in the height direction.

<Heat radiation fin 14>
Next, the radiation fin 14 shown in FIG. 3 will be described. The heat radiating fins 14 are provided inside the air passage 122 extending in the substantially vertical direction along the side wall 121 a of the storage chamber 121. The heat radiating fins 14 are made of aluminum, and include a first heat radiating portion that abuts on the surface on the surface of the other end of the heat pipe 13 projecting into the air passage 122 and a second heat radiating portion that abuts on the surface on the back side. Has been. In other words, the other end (projecting portion) 131 of the heat pipe 13 is sandwiched between the first heat radiating portion 141 and the second heat radiating portion 142 of the heat exchange fin 14.

  Further, similar to the heat radiating fins 14 provided in the air passage 122, the same heat radiating fins 14 are provided in the air passage 123. Thus, by providing the radiation fin 14 that contacts the other end of the heat pipe 13 protruding from the air passages 122 and 123, the heat radiation efficiency from the heat pipe 13 to the inside of the air passages 122 and 123 is increased. The cooling efficiency of the image display unit 1 can be increased.

  In the present embodiment, the heat radiation fin 14 is used as a heat radiation member for increasing the heat radiation efficiency from the heat pipe 13 to the inside of the air passages 122 and 123. You may employ | adopt a member.

<Ventilation fans 15 and 16>
Next, the ventilation fans 15 and 16 provided in the ventilation path 122 will be described. The ventilation fans 15 and 16 are blowing means for circulating the air in the ventilation path 122 in a predetermined direction along the ventilation path 122. As shown in FIG. The ventilation fan 16 is arranged at the lower end 122 b inside the ventilation path 122.

  Specifically, the ventilation fan 15 discharges the air in the ventilation path 122 to the outside of the housing 12 from the ventilation hole (not shown) provided in the upper surface 21 a of the frame portion 21 of the support 2. Is provided. As a result, an air flow is formed in the air passage 122 from the bottom to the top in the substantially vertical direction. In addition, the ventilation fan 16 is provided so as to suck air outside the housing 12 from the ventilation opening 61 into the ventilation path 122. As a result, an air flow is formed in the air passage 122 from the bottom to the top in the substantially vertical direction.

  The ventilation fans 15 and 16 are also provided in the ventilation path 123 in the same manner as the above-described ventilation path 122 (see FIG. 3). An air flow from the bottom to the top is formed.

  As described above, the heat released from the heat pipe 13 to the inside of the ventilation paths 122 and 123 can be efficiently dissipated to the outside of the housing 12 by the ventilation fans 15 and 16. The heat radiation efficiency of the heat pipes 13 and the heat radiation fins 14 inside can be increased.

  In particular, in the present embodiment, since the air in the air passages 122 and 123 flows from the bottom to the top, the air that is warmed by the heat released from the heat pipe 13 is coupled with the property of the air that the warm air rises. The air in the paths 122 and 123 efficiently flows from the bottom to the top. Therefore, the heat released into the air passages 122 and 123 can be efficiently dissipated to the outside of the housing 12 by such a configuration.

  In this embodiment, the ventilation fans 15 and 16 are used as the blowing means for discharging the air in the ventilation paths 122 and 123 to the outside of the housing 12, but the ventilation fans 15 and 16 of the embodiment are used. Not limited to 16, other air blowing means may be employed.

<Heat collecting fins 17>
Next, the heat collection fins 17 provided in the storage chamber 121 will be described with reference to FIG. The heat collection fins 17 are heat collection members for collecting the heat released from the display panel 11 into the circulation flow path 92 and guiding it to the heat pipe 13, and a plurality of heat provided on the back surface 111 of the display panel 11. It is provided so as to exchange heat with the pipe 13.

  Specifically, the heat collecting fins 17 extend over a plurality of heat pipes 13 provided in a substantially vertical direction on the back surface 111 of the display panel 11, and a base that contacts the plurality of heat pipes 13, The fin portion is vertically connected to one surface of the base portion and extends in the longitudinal direction of the base portion. FIG. 3 shows a state in which the heat collecting fins 17 are attached only to the heat pipe 13 located on the ventilation path 122 side with respect to the center line 111a of the back surface 111. The heat collection fins 17 are also attached to the heat pipe 13 on the air passage 123 side with respect to 111a.

  Thus, by providing the heat collection fins 17, the heat collection fins 17 recover the heat released from the display panel 11 into the circulation flow path 92, and exchange the recovered heat with the heat collection fins 17. The heat pipe 13 that is in thermal contact can be efficiently guided. Thereby, the function of the heat pipe 13 as a heat exchange means increases, and as a result, the cooling efficiency of the image display unit 1 can be increased.

  In this embodiment, the heat collecting fins 17 are used as the heat collecting members for collecting heat from the air flowing in the circulation flow path 92. However, the heat collecting members are limited to the heat collecting fins 17 of the embodiment. Instead of the heat collection fins 17, other heat collection members may be used instead of the heat collection fins 17. Further, the image display unit 1 may be configured without providing the heat collecting fins 17.

<Insulation member 7>
The heat insulating member 7 is provided to prevent the inconvenience that the display panel 11 adjacent to the evaporator 191 of the cooling unit 199 is excessively cooled by the evaporator 191. As shown in FIG. It is interposed between the evaporator 191 and the display panel 11.

  Specifically, the evaporator 191 is disposed on the back surface 111 side of the display panel 11, and the heat insulating member 7 is disposed between the back surface 111 of the display panel 11 and the front surface 191 a of the evaporator 191. As a material of the heat insulating member 7, for example, urethane, silicon rubber, or the like is used.

  As described above, the heat generated in the display panel 11 is guided to the evaporator 191 through the air flowing in the circulation flow path 92 and collected by the evaporator 191. However, as in this embodiment, the display panel 11 When the evaporator 191 is provided adjacent to the display panel 11, a portion of the display panel 11 adjacent to the evaporator 191 is excessively cooled by the evaporator 191, which may adversely affect the function of the display panel 11. Therefore, by interposing the heat insulating member 7 between the display panel 11 and the evaporator 191, it is possible to prevent the inconvenience that the portion of the display panel 11 adjacent to the evaporator 191 is excessively cooled. Thereby, the temperature distribution of the display panel 11 can be made uniform, and the function of the display panel 11 can be maintained in a good state.

<Heat collecting fins 71 and blower fans 72 for circuit boards>
Next, the heat collecting fins 71 for the circuit board and the blower fan 72 will be described with reference to FIG. The heat collecting fins 71 for the circuit board are heat collecting means provided to collect heat from the air existing on the back side of the back wall 125, and are installed on the back side near the lower end of the back wall 125. In particular, the heat collecting fins 71 are arranged in a region (cooling region) that can be cooled by the evaporator 191 so that the heat collected by the heat collecting fins 71 can be recovered by the evaporator 19. In the present embodiment, the heat collection fins 71 are arranged in the cooling region of the evaporator 191 so as to face the evaporator 191 with the back wall 125 interposed therebetween.

  Further, the blower fan 72 is a circulation blower device for causing the air existing on the back side of the back wall 125 cooled by the evaporator 191 to flow along the back surface of the back wall 125. The blower fan 72 is disposed on the back surface of the back wall 125 near the upper side of the heat collecting fins 71 for the circuit board. In the present embodiment, air existing on the back side of the back wall 125 and in the cooling region of the evaporator 19 is blown to the circuit board 11 e by the blower fan 72.

  According to the heat collecting fins 71 for the circuit board described above, heat can be collected from the air existing in the cooling region on the back side of the back wall 125, and the collected heat can be recovered by the evaporator 191. Thereby, the air existing on the back side of the cooling region of the back wall 125 can be efficiently cooled by the evaporator 191.

  Then, the cooled air is blown to the circuit board 11e provided on the back side of the back wall 125 by the blower fan 72 for the circuit board. Thereby, the heat generated in the circuit board 11 e can be recovered into the air blown by the blower fan 72. As a result, the circuit board 11e can be efficiently cooled.

  As described above, in this embodiment, the heat collecting fins 71 and the blower fan 72 for the circuit board are used as the heat collecting means and the blower for efficiently cooling the circuit board 11e. Instead of the heat collection fins 71 and the blower fans 72 of the embodiment, other heat collection means and blower devices may be employed. In the present embodiment, the air present in the cooling area of the evaporator 191 and on the back side of the back wall 125 is blown to the circuit board 11e by the blower fan 72. For example, in the vicinity of the circuit board 11e, It is also possible to configure the air to be blown to the heat collecting fins 71 by a blower.

(3) Arrangement of luminaires The back wall 125 constituting the back surface of the storage chamber 121 is composed of a vertical wall portion 125a extending in a substantially vertical direction and inclined wall portions 125b and 125c provided at both ends thereof. ing. The vertical wall portion 125 a extends in the vertical direction along the back surface 111 of the display panel 11. The inclined wall portion 125b is provided at the upper end of the vertical wall portion 125a, and is bent upward from the upper end of the vertical wall portion 125a to the back surface 3 side and is erected obliquely upward. In addition, the inclined wall portion 125c is provided at the lower end of the vertical wall portion 125a, and is formed so as to bend from the lower end of the vertical wall portion 125a to the back surface 3 side and descend obliquely downward.

  As described above, the inclined wall portions 125b and 125c extending to the back surface 3 side are provided at both ends of the vertical wall portion 125a of the back wall 125, so that the space between the back wall 125 and the back surface 111 of the display panel 11 is on the upper side. A first accommodation space 12b is formed along the surface of the inclined wall portion 125b, and a first accommodation space 12c is formed along the surface of the inclined wall portion 125c on the lower side. That is, the first storage spaces 12b and 12c having a predetermined space on the back surface 111 side of the display panel 11 are formed at the upper end portion and the lower end portion of the flow path portion 11c of the circulation flow path 92, respectively. Further, a second accommodation space 12a is formed between the back wall 125 and the back plate 3 along the back surface of the vertical wall portion 125a.

  As shown in FIG. 4, a circulation fan 18 is disposed in the first accommodation space 12b, and the circulation fan 181 and the cooling unit are arranged in the first accommodation space 12c as shown in FIGS. 199 is arranged. Moreover, as shown in FIG. 4, the lighting fixture 5 for illuminating the advertising film is disposed in the second accommodation space 12a. The luminaire 5 is composed of a plurality of fluorescent lamps, and the fluorescent lamps are juxtaposed in the horizontal direction along the vertical wall portion 125a in the second accommodating space 12a.

  By providing the inclined wall portions 125b and 125c as described above, the first storage spaces 12b and 12c in which the circulation fans 18 and 181 and the cooling unit 199 are disposed can be formed inside the storage chamber 121, and the lighting fixture 5 Is disposed outside the storage chamber 121 and substantially below the circulation fan 18 in the storage chamber 121, and the circulation fan 181 and the cooling unit in the storage chamber 121. It can be formed at a position corresponding to substantially above 199. That is, the second storage space 12a is interposed between the first storage space 12b and the first storage space 12c in the vertical direction or the substantially vertical direction. Accordingly, the circulation fans 18 and 181 and the cooling unit 199 and the lighting fixture 5 can be arranged in parallel in the vertical direction or the substantially vertical direction, so that the image display unit 1 is arranged in the thickness direction (that is, FIG. 4). It is possible to avoid an increase in size in the width direction of the flow path portions 11a and 11c.

(4) Control of image display device <Control means for image display device>
As shown in FIGS. 14 and 15, the image display device includes panel temperature sensors TS <b> 1 to TS <b> 4 that detect the temperature of the surface 112 of the display panel 11, and 4 for detecting the illuminance of the surface 112 of the display panel 11. Two illuminance sensors LS1 to LS4, a temperature sensor TS5 for detecting the temperature of the back surface 102 of the image display device, an outside air temperature sensor TS8 for detecting the outside air temperature, and a G sensor GS1 are attached. Further, in the above-described cooling device 19 of the image display device, as shown in FIG. 14, a temperature sensor TS6 for detecting the temperature of the condenser 192 of the refrigerant circuit 210 and a temperature of the evaporator 191 are detected. Temperature sensor TS7 is attached.

  The panel temperature sensors TS1 and TS2 are attached to the surface 112 of the display panel 11 near the upper corners of the display screen 112a. The panel temperature sensors TS3 and TS4 are attached to the surface 112 of the display panel 11. Thus, they are respectively attached to the vicinity of both corners below the display screen 112a.

  The illuminance sensors LS1 and LS2 are attached to the surface 112 of the display panel 11 and near the upper corners of the display screen 112a. The illuminance sensors LS3 and LS4 are respectively attached near the lower corners of the display screen 112a. The control means C of the image display device controls the luminance of the liquid crystal display 10 based on the illuminance of the surface 112 of the display panel 11 detected by the illuminance sensors LS1 to LS4.

  The temperature sensor TS5 is attached to the back surface 102 of the image display device. Based on the temperature of the back surface 102 detected by the temperature sensor TS5, the control means C of the image display device uses the ventilation fans 15 and 16 provided in the ventilation paths 122 and 123 (in FIG. 15, the ventilation fan). 15 is controlled.

  The G sensor GS <b> 1 is for sensing vibration and impact of the image display device, and is attached below the surface 112 of the display panel 11. Specifically, when the G sensor GS1 senses vibration or impact, the control means C of the image display device turns off the luminaire 5 and the liquid crystal display 10 and stops the operation of the control device 310 of the cooling device 19. A predetermined electrical signal is transmitted. Upon receiving this electric signal, the cooling device 19 immediately receives all the devices connected to the output side (that is, the refrigerant compressor 210, the heat dissipating fan 193, the circulating fans 18, 181 and the air blower) regardless of the control operation. The operation of the fan 72 and the like is stopped. In addition, in FIG. 15, although the position of the ventilation fan 15 and the ventilation fan 72 is shown simply, it shall be actually installed in the position demonstrated above.

  The control means C of the image display device is constituted by a general-purpose microcomputer and incorporates a timer as a time limit means. The control means C controls the operation of each device (that is, the lighting fixture 5 and each of the fans 15, 16, 72, etc.) by turning on the power supply of the entire image display apparatus only within a preset operation time, and outside the operation time. Is controlled to be OFF. Specifically, in this embodiment, the operation of each device is controlled within the time period from 4 o'clock to 24 o'clock by its own timer. In addition, during this operation time, the control means C turns off the luminaire 5 during the set daytime period (for example, 7:00 to 17:00) and detects the illuminance sensors LS1 to LS4 as described above. Based on the above, the brightness of the liquid crystal display 10 is controlled. In addition, the lighting fixture 5 is turned on at night, and the luminance of the liquid crystal display 10 is set to a fixed value (for example, luminance 290 cd / m 2) set in advance. The operation control of the cooling device 19 is executed by the control device 310 included in the cooling device 19.

<Control device for cooling device>
FIG. 16 is a block diagram of the control device 310 of the cooling device 19 described above. The control device 310 is a control unit that controls the cooling device 19. The control device 310 is constituted by a general-purpose microcomputer and incorporates a timer as a time limit means. Connected to the input side of the control device 310 are the panel temperature sensors TS1 to TS4, the temperature sensor TS6 of the condenser 192, the temperature sensor TS7 of the evaporator 191 and the outside air temperature sensor TS8 provided on the surface 112 of the display panel 11, respectively. Has been. The control device 310 is configured to receive a signal (electric signal) from the control means C of the image display device.

  Further, on the output side, the refrigerant compressor 200, the circulation fan 181 installed near the upper part of the evaporator 191, the heat dissipation fan 193 as a radiator blower for ventilating the outside air to the condenser 192, the circulation flow The circulation fan 18 and the blower fan 72 installed at the upper end of the flow path portion 11c of the path 92 are connected. The controller 310 controls the operation of each device connected to the output side based on the output of each sensor connected to the input side and the signal from the control means C of the image display device.

  The control device 310 performs on / off control of the operation of the refrigerant compressor 210 so that the detected temperatures of the panel temperature sensors TS1 to TS4 become set temperatures. The set temperature is changed by the control device 310 so that the night is higher than the daytime. Furthermore, the control device 310 stops the operation of the refrigerant compressor 200 when the temperature detected by the outside air temperature sensor S8 exceeds a predetermined range.

  Furthermore, the control device 310 reduces the amount of heat exchange between the evaporator 191 and air when the refrigerant circuit 210 reaches an overload state described later. Specifically, the control device 310 detects when the temperature of the condenser 192 detected by the temperature sensor TS6 rises to a predetermined first value or higher, or by the temperature sensor TS7. If any of the conditions when the temperature of the evaporator 191 rises to a predetermined second value or higher is satisfied, it is determined that the refrigerant circuit 210 is in an overload state, and air is sent by the circulation fan 181. Control is performed to reduce the amount of heat exchange between the evaporator 191 and air by reducing the air volume. Further, the controller 310 detects the evaporator 191 detected by the temperature sensor TS7 when the temperature of the condenser 192 detected by the temperature sensor TS6 drops below a predetermined third value set in advance. When the temperature of the refrigerant circuit falls below a predetermined fourth value, the refrigerant circuit 210 is judged to be in a light load state, and the amount of air blown by the heat dissipating fan 193 is reduced. By doing so, control is performed so as to reduce the amount of air blown to the condenser 192. Specific control operations will be described in detail below.

  Here, based on the flowchart shown in FIG. 17, the control operation of the control device 310 will be described. The control device 310 performs operation control of the cooling device 19 described in detail below within a predetermined operation time, and stops the operation outside the predetermined operation time. In addition, outside the operation time, as described above, the operation of each device of the entire image display apparatus is stopped by the control means of the image display apparatus. First, in step S1, the control device 310 determines whether it is within a predetermined operation time (in this embodiment, between 4 o'clock and 24 o'clock) by its own timer. In step S1, the control device 310 returns to step S0 and stops the operation control of the cooling device 19 when the current time is outside the predetermined operation time (in the present embodiment, 0:00 to 4 o'clock). The state (power OFF in FIG. 17) is continued.

  Then, when the predetermined operation time (4 o'clock to 24 o'clock) comes in step S1, the control device 310 proceeds to step S2 and starts operation control of the cooling device 19 when the temperature of the display panel 11 reaches the predetermined temperature. (Power ON in FIG. 17), the process proceeds to step S3. In step S3, the control device 310 detects that the detected temperature of the panel temperature sensors TS1 to TS4 is equal to or higher than the upper limit value (MAX) of the set temperature, for example, the upper limit value (MAX) of the set temperature is + 47 ° C. or higher in the daytime. Determine whether or not. If any temperature detected by the panel temperature sensors TS1 to TS4 in step S3 is lower than + 47 ° C., the control device 310 returns to step S1. On the other hand, if any one of the panel temperature sensors TS1 to TS4 has a detected temperature of + 47 ° C. or higher, the control device 310 proceeds to the next step S4.

  In step S4, control device 310 determines whether or not 10 minutes have elapsed since the previous operation of refrigerant compressor 200 was stopped by its own timer. Here, when 10 minutes or more have passed since the previous stop of the refrigerant compressor 200, the control device 310 proceeds to the next step S5, and the circulation fan 18 (the internal circulation fan shown in FIG. 17). And the blower fan 72 are started, and at the same time, the refrigerant compressor 200, the circulation fan 181 and the two heat dissipating fans 193 are started. Thereby, the compression operation of the refrigerant compressor 200 is started.

  That is, when the operation of the refrigerant compressor 200 is started by the control device 310 in step S5, low-temperature and low-pressure refrigerant gas is sucked into the sealed container 200A from the refrigerant introduction pipe 220 on the suction side of the refrigerant compressor 200. The refrigerant gas is compressed by a compression element provided in the container 200A and becomes a high-temperature and high-pressure refrigerant gas. The compressed high-temperature and high-pressure refrigerant gas is discharged from the refrigerant discharge pipe 221 and flows into the condenser 192 of the condensing unit 198. Here, the refrigerant exchanges heat with the outside air blown by the heat radiating fan 193 and is sufficiently condensed and liquefied.

  The refrigerant discharged from the condenser 192 returns to the compressor unit 198 again, sequentially passes through the receiver tank 201, the filter dryer 202, and the service valve 212, reaches the expansion valve 203 of the cooling unit 199, and is decompressed by the expansion valve 203. Then, it flows into the evaporator 191.

  Then, the refrigerant that has flowed into the evaporator 191 disposed in the storage chamber 121 evaporates there, and draws heat from the circulating air in the circulation passage 92 blown by the circulation fan 181 to exert a cooling action. . The cold air heat-exchanged with the evaporator 191 is blown by the circulation fan 181 to the flow path portion 11a formed along the surface 112 of the display panel 11 through the flow path portion 11d of the circulation flow path 92. . On the other hand, the refrigerant evaporated in the evaporator 191 then exits the evaporator 191 and returns to the compressor unit 198, and sequentially passes through the service valve 213, the accumulator 205, and the check valve 206, and again from the refrigerant introduction pipe 220 to the refrigerant compressor. The cycle drawn into 200 is repeated.

  As described above, when the operation of the refrigerant compressor 200 is started in step S5, the operation of circulating the refrigerant into the refrigerant circuit 210 as described above is repeated. By such an operation, normally, the refrigerant evaporates at a predetermined temperature in the evaporator 191, and the surrounding air is cooled by the endothermic action of the refrigerant at that time. Then, the cooled air around the evaporator 191 is circulated in the circulation flow path 92 by the circulation fans 18 and 181.

  In this way, by circulating the air in the circulation flow path 92 by the circulation fans 18 and 181, the heat of the display panel 11 in the circulation flow path 92 is guided to the evaporator 191 using this air as a medium. It can be recovered by the evaporator 191. In addition, the air cooled by releasing heat to the refrigerant in the evaporator 191 is circulated through the circulation channel 92 again, and the operation of guiding the heat of the display panel 11 to the evaporator 191 is repeated. Thereby, the display panel 11 can be cooled to an appropriate temperature, and the temperature rise of the display panel 11 can be eliminated or suppressed.

  On the other hand, when starting the refrigerant compressor 200 in step S5 described above, the control device 310 proceeds to step S6, and the detected temperatures of the panel temperature sensors TS1 to TS4 are below the lower limit value (MIN) of the set temperature, for example, In the daytime period, it is determined whether the lower limit value (MIN) of the set temperature is + 40 ° C. or less. When the temperature detected by the panel temperature sensors TS1 to TS4 is higher than + 40 ° C. in step S6, the control device 310 returns to step S1.

  On the other hand, when the detected temperature detected by all the panel temperature sensors TS1 to TS4 becomes + 40 ° C. or lower in step S6, the control device 310 moves to the next step S7 and is provided above the evaporator 191. At the same time as the operation of the circulating fan 181 is stopped, time counting is started by its own timer. In this embodiment, when the detected temperature detected by all the panel temperature sensors TS1 to TS4 in step S6 becomes + 40 ° C. or lower, the control device 310 proceeds to the next step S7. The present invention is not limited to this, and the process may proceed to the next step S7 when the detected temperature of any one of the panel temperature sensors TS1 to TS4 becomes + 40 ° C. or lower.

  Then, when 5 minutes have elapsed since the start of the time counting in step S7, the control device 310 proceeds to the next step S8, stops the operation of the compressor 200 and the heat dissipation fan 193, and Reset the time count and start counting again. In step S8, the control device 310 also stops the operation of the circulation fan 18 and the blower fan 72. Then, in step S8, control device 310 stops refrigerant compressor 200 (starts counting) and maintains the state in which operation of refrigerant compressor 200 is stopped for 30 minutes.

  When 30 minutes have passed since the compressor 200 was stopped in step S8, the control device 310 next proceeds to step S9 and determines whether or not the detected temperatures of the panel temperature sensors TS1 to TS4 are + 10 ° C. or higher. To do. Here, when the detected temperature of any one of the panel temperature sensors TS1 to TS4 becomes + 10 ° C. or higher, the control device 310 proceeds to step S10 to start the operation of the circulation fans 18 and 181 and again to step S1. Repeat the return control action. If the detected temperatures of all the panel temperature sensors TS1 to TS4 are less than + 10 ° C. in step S9, the control device 310 determines that the detected temperature of any of the panel temperature sensors TS1 to TS4 is higher. Step S9 is repeated until + 10 ° C. or higher.

  In the present embodiment, as described above, in step S9, the control device 310 shifts to step S10 when the detected temperature of any of the panel temperature sensors TS1 to TS4 becomes + 10 ° C. or higher. Not limited to this, the process may proceed to the next step S10 after the detected temperatures of all the panel temperature sensors TS1 to TS4 become + 10 ° C. or higher. In this case, if the detected temperature of any of the panel temperature sensors TS1 to TS4 is lower than + 10 ° C. in step S9, the control device 310 determines that the detected temperatures of all the panel temperature sensors TS1 to TS4 are the same. Step S9 is repeated until + 10 ° C or higher.

(I) Nighttime set temperature change control By the way, in the nighttime zone, the control device 310 sets the set temperature of the panel temperature sensors TS1 to TS4 for on-off control of the refrigerant compressor 200 in the above-mentioned daytime zone. Change the temperature so that it is higher than the set temperature. In this embodiment, in the daytime period, when the detected temperature of the panel temperature sensors TS1 to TS4 becomes + 47 ° C. or higher in step S3 as described above, the process proceeds to step S4, and the operation of the refrigerant compressor 200 is started in step S5. To do. On the other hand, at night, when the controller 310 reaches + 55 ° C. or higher, which is higher than the daytime set temperature in step S3, the process proceeds to the next step S4 and controls to start the operation of the refrigerant compressor 200 in step S5.

  Further, in the daytime period, when the detected temperature of the panel temperature sensors TS1 to TS4 is lowered to + 40 ° C. or lower in step S6, the control device 310 stops the operation of the refrigerant compressor 200 in step S8 through the next step S7. On the other hand, at night, when it becomes + 50 ° C. or lower that is higher than the daytime set temperature in step S6, the process proceeds to the next step S7, and the operation of the compressor 200 is controlled to stop in step S8.

  In this way, since the on / off set temperature of the refrigerant compressor 200 is changed so that the night becomes higher than the daytime, frequent on / off of the refrigerant compressor 200 at night can be eliminated. As a result, the refrigerant compressor 200 can be protected.

  By the way, if the refrigerant circuit 210 falls into an overload state during the operation of the refrigerant compressor 200 described above (that is, step S5), the refrigerant evaporation temperature in the evaporator 191 rises, and the air in the circulation channel is removed. It becomes difficult to recover the heat of the display panel 11 as a medium. In this case, if the air that has passed through the evaporator 191 is circulated in the circulation flow path 92 as usual, there is a possibility that a problem of hindering heat dissipation of the display panel 11 may occur.

  On the other hand, when the refrigerant circuit 210 is in a light load state where the outside air temperature is low, the temperature of the display panel 11 is not high. Therefore, the operation of the cooling device 19 is stopped so that the wasteful operation is not performed. Yes.

  Therefore, in the present invention, the control of the cooling device 19 is performed during the operation of the refrigerant compressor 200 in order to eliminate or suppress the occurrence of the above-described problems when the refrigerant circuit 210 is overloaded or lightly loaded. The apparatus 310 protects the display panel 11 and the refrigerant compressor 200 by performing the following control.

(Ii) Control of circulating fan 181 during operation of refrigerant compressor First, the control device 310 reduces the amount of heat exchange between the evaporator 191 and air when the refrigerant circuit 210 is in an overload state as described above. Let In this case, the amount of heat exchange between the evaporator 191 and air is reduced by lowering the amount of air blown by the circulation fan.

  Specifically, the control device 310 at least when the temperature of the condenser 192 detected by the temperature sensor TS6 rises to a preset first value or higher (for example, + 48 ° C. or higher), or the temperature sensor TS7. When the temperature of the evaporator 191 detected by (1) satisfies any of the cases where the temperature has risen to a preset second value or higher (for example, + 7 ° C. or higher), it is determined that the refrigerant circuit 210 is overloaded. Shall. In this embodiment, when both the case where the temperature of the condenser 192 by the temperature sensor TS6 is + 48 ° C. or higher and the temperature of the evaporator 191 by the temperature sensor TS7 is + 7 ° C. or higher are satisfied, the control device 310 Determines that the refrigerant circuit 210 is overloaded.

  Then, when determining that the controller 310 is in an overload state, only the circulation fan 181 provided near the upper portion of the evaporator 191 is stopped. At this time, the control device 310 continues to operate the circulation fan 18. As described above, when it is determined that the state is an overload state, only one circulation fan 181 among the circulation blowers provided in the circulation flow path 92 is stopped by the control device 310, and the amount of air blown is reduced. Thus, the amount of heat exchange between the evaporator 191 and air can be reduced.

  Thereby, it falls into an overload state, the evaporation temperature of the refrigerant | coolant in the evaporator 191 rises, the heat | fever of the display panel 11 conveyed with the circulating air in the said evaporator 191 cannot be collect | recovered, and a state with a high temperature remains The disadvantage that the air circulates in the circulation flow path 92 and adversely affects the heat radiation of the display panel 11 can be eliminated or suppressed.

  In the present embodiment, as described above, both the case where the temperature of the condenser 192 by the temperature sensor TS6 is + 48 ° C. or more and the temperature of the evaporator 191 by the temperature sensor TS7 is + 7 ° C. or more are satisfied. In this case, the control device 310 determines that the refrigerant circuit 210 is in an overload state, but the present invention is not limited to this. When at least either the temperature of the condenser 192 has risen above a preset first value or the temperature of the evaporator 191 has risen above a preset second value, The present invention is effective if it is determined that the refrigerant circuit 210 is in an overload state.

  Further, in this embodiment, when the control device 310 determines that the load is overloaded, only the circulation fan 181 provided near the upper portion of the evaporator 191 is stopped, so that the heat exchange amount between the evaporator 191 and the air is reduced. However, the present invention is not limited to this. For example, if the control device 310 determines that the load is overloaded, the heat exchange amount between the evaporator 191 and the air is reduced by reducing the number of revolutions of the circulation fan 181. The present invention is effective even if it is used. When the controller 310 determines that the load is overloaded, the rotational speed of both the circulation fans 18 and 181 provided in the circulation flow path 92 is reduced, or one of the fans is stopped and the other rotational speed is reduced. It can be lowered.

(Iii) Control of Heat Dissipation Fan during Operation of Refrigerant Compressor Next, operation control of heat dissipation fan 193 by control device 310 during operation of refrigerant compressor 200 will be described. During operation of the refrigerant compressor 200, the operation of the two heat dissipating fans 193 is controlled by the control device 310. Specifically, the controller 310 operates the two heat dissipating fans 193 with priority given to other conditions for a predetermined time (for example, 6 minutes) after starting the refrigerant compressor 200.

  Then, when a predetermined time (6 minutes in this embodiment) has elapsed since the start of the refrigerant compressor 200, the control device 310 is based on the temperature of the condenser 192 detected by the temperature sensor TS6. To control the operation. In this case, the controller 310 operates the two heat dissipating fans 193 when the temperature of the condenser 192 detected by the temperature sensor TS6 reaches a predetermined temperature (for example, + 40 ° C. or higher). Further, the control device 310 determines that the refrigerant circuit 210 is in a light load state when the temperature of the condenser 192 detected by the temperature sensor TS6 falls below the third value (for example, + 33 ° C. or less). Any one of the heat dissipating fans 193 is stopped, and only one heat dissipating fan 193 is operated. As a result, the amount of air blown by the heat radiating fan 193 is reduced by the control device 310, and the inconvenience that the pressure on the high pressure side in the refrigerant circuit 210 is abnormally reduced can be suppressed.

  In the present embodiment, as described above, the controller 310 determines that the temperature of the condenser 192 is equal to or lower than the third value (+ 33 ° C. or lower) based on the temperature of the condenser 192 detected by the temperature sensor TS6. It is determined that the refrigerant circuit 210 is in a light load state and one of the heat dissipating fans 193 is stopped to reduce the amount of air blown by the heat dissipating fan 193. Not limited to this, when the temperature of the condenser 192 falls below the third value, the rotational speed of both fans 193 or the rotational speed of one of the fans 193 is reduced, so that the air flow by the heat radiating fan 193 is reduced. The present invention is effective for reducing the amount of air blown or by reducing the amount of air blown by the heat dissipating fan 193 by stopping the operation of both fans 193.

  Furthermore, not only the temperature of the condenser 192 detected by the temperature sensor TS6 but also the operation of the heat dissipation fan 193 may be controlled based on the temperature of the evaporator 191 detected by the temperature sensor TS7. For example, when the temperature of the evaporator 191 detected by the temperature sensor TS7 falls below a predetermined fourth value set in advance, the control device 310 determines that the refrigerant circuit 210 is in a light load state and dissipates heat. The present invention is also effective for reducing the amount of air blown by the fan 193. In this case, either one of the heat dissipating fans 193 may be stopped to reduce the amount of air blown by the heat dissipating fan 193, or the number of rotations of both fans 193 or the rotation of one of the fans 193 may be reduced. By reducing the number, the amount of air blown by the heat dissipating fan 193 may be reduced. Further, by stopping the operation of both fans 193, the amount of air blown by the heat dissipating fan 193 may be reduced.

  Furthermore, the operation of the heat radiation fan 193 may be controlled based on both the temperature of the condenser 192 detected by the temperature sensor TS6 and the temperature of the evaporator 191 detected by the temperature sensor TS7. It is valid.

(Iv) Refrigerant compressor stop control based on outside air temperature Further, the control device 310 stops the operation of the compressor 200 when the outside air temperature detected by the outside air temperature sensor TS8 exceeds a preset range. I have control. That is, when the outside air temperature is too low, the temperature rise at the display panel 11 can be suppressed, so that the display panel 11 does not need to be cooled, and the refrigerant compressor 200 is stopped. On the other hand, if the outside air temperature is too high, the condenser 192 cannot release the heat of the refrigerant circuit 210 to the outside air. As a result, the temperature of the refrigerant circuit 210 as a whole increases, and the refrigerant circuit 210 becomes high. There is a risk of falling into a load state.

  Therefore, in the present invention, when the temperature detected by the outside air temperature sensor exceeds a predetermined range, the controller 310 is controlled to stop the operation of the refrigerant compressor. Specifically, in the present embodiment, when the outside air temperature exceeds the temperature range of + 10 ° C. or higher and + 40 ° C., the operation of the refrigerant compressor 200 is stopped by the control device 310. That is, when the outside air temperature detected by the outside air temperature sensor TS8 falls below + 10 ° C., the control device 310 stops the operation of the refrigerant compressor 200. In this way, when the outside air temperature detected by the outside air temperature sensor TS8 falls below + 10 ° C., the operation of the refrigerant compressor 200 is stopped, so that the above-described protection at the low outside air temperature is performed, and the refrigerant compressor 200 is also performed. This increases the viscosity of the oil and can solve the problem that the oil does not return from the evaporator 191 to the refrigerant compressor 200.

  Further, also when the outside air temperature detected by the outside air temperature sensor TS8 rises above + 40 ° C., the operation of the refrigerant compressor 310 is stopped by the control device 310. As a result, the disadvantage that the refrigerant circuit 210 is overloaded can be avoided as much as possible.

(V) Refrigerant compressor stop control based on condenser temperature and evaporator temperature Furthermore, the control device 310 activates the refrigerant compressor 200 to protect the refrigerant circuit 210 from being overloaded or lightly loaded. Then, when the temperature of the condenser 192 detected by the temperature sensor TS6 exceeds a preset range after a predetermined time has elapsed, the operation of the compressor 200 is controlled to stop. In this embodiment, when the temperature of the condenser 192 detected by the temperature sensor TS6 exceeds the temperature range of + 30 ° C. to + 60 ° C. after 3 minutes have passed since the operation of the refrigerant compressor 200 is started, the control device The operation of the refrigerant compressor 200 is stopped by 310.

  Similarly, the control device 310 protects the overload state of the refrigerant circuit 210 and, in order to prevent useless operation in the light load state, the temperature sensor TS7 since the predetermined time has elapsed since the refrigerant compressor 200 was started. When the temperature of the evaporator 191 detected by the above exceeds a preset range, the operation of the compressor 200 is controlled to be stopped. In this embodiment, the control is performed when the temperature of the evaporator 191 detected by the temperature sensor TS7 exceeds the temperature range of −15 ° C. to + 12 ° C. after 3 minutes have passed since the operation of the refrigerant compressor 200 is started. The operation of the refrigerant compressor 200 is stopped by the device 310.

  Each configuration of the present invention is not limited to the above-described embodiments, and various modifications can be made within the technical scope described in the claims. For example, the image display device of the present invention is not limited to the liquid crystal display described in the embodiment, and the above-described technique is applied to an image display device including a flat display such as a plasma display or an organic EL (Electro-Luminescence) display. Is possible.

DESCRIPTION OF SYMBOLS 1 Image display part 2 Support stand 3 Back board 4 Cover 5 Lighting fixture 6 Ventilation plate 7 Heat insulation member 10 Liquid crystal display (planar display)
DESCRIPTION OF SYMBOLS 11 Display panel 11e Circuit board 12 Case 13 Heat pipe 14 Radiation fin 17 Heat collection fin 18 Circulation fan 19 Cooling device 21 Frame part 61 Ventilation hole of ventilation | gas_flowing plate 71 Heat collection fin for circuit boards 72 Air blow for circuit boards Fan 92 Circulation channel 121 Accommodating chamber 121a, 121b Side wall 122, 123 Ventilation path 124 Surface wall 125 Back wall 125a Vertical wall 125b, 125c Inclined wall 127 Upper surface wall 128 Lower surface wall 181 Circulation fan 191 Evaporator 192 Condenser 193 Heat Dissipation Fan 195 Machine Room 197 Compressor Unit 197A Cover 198 Condenser Unit 199 Cooling Unit 200 Refrigerant Compressor 200A Sealed Container 200B Vibration Isolation Member 201 Receiver Tank 202 Filter Dryer 203 Expansion Valve 205 Accumulator 206 Check valve 207 Solenoid valve 208 Capillary tube 209 Warm cylinder 210 Refrigerant circuit 212, 213 Service valve 220 Refrigerant introduction pipe 221 Refrigerant discharge pipe 222, 223, 224, 225, 226 Refrigerant pipe 227 Bypass pipe 228 Electrical box 300 unit base 310 control device

Claims (4)

A flat display having a display panel, a casing that accommodates the flat display and that allows the display screen of the display panel to be viewed from the outside, and is disposed below the casing, and the flat display is disposed in the casing In an image display device comprising a cooling device for sending air for cooling
The cooling device includes a refrigerant circuit formed by annularly connecting at least a refrigerant compressor, a radiator, a decompression device, and an evaporator with refrigerant piping, and a circulation fan that sends the air cooled by the evaporator into the casing. When the temperature of the radiator and the temperature of the radiator rises to a first value or higher, or when the temperature of the evaporator rises to a second value or higher, the refrigerant circuit is excessive. An image display device comprising: a control device that determines that the load is in effect and reduces the amount of air blown by the circulation blower . A radiator for the radiator that blows outside air to the radiator,
When the temperature of the radiator has decreased to a third value or less, or when the temperature of the evaporator has decreased to a fourth value or less, the control device satisfies the refrigerant circuit. The image display apparatus according to claim 1 , wherein the image display device is determined to be in a light load state and reduces the amount of the outside air blown to the radiator by the radiator blower . It has an outside temperature sensor that detects the temperature of outside air,
The image display device according to claim 1, wherein the control device stops the operation of the refrigerant compressor when a temperature detected by the outside temperature sensor exceeds a predetermined range . A display temperature sensor for detecting the temperature of the flat display;
The control device performs on / off control of the operation of the refrigerant compressor so that the detected temperature of the display temperature sensor becomes a set temperature, and changes the set temperature so that the night becomes higher than the daytime. The image display device according to any one of claims 1 to 3, wherein the image display device is characterized.

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