WO2012140714A1

WO2012140714A1 - Display apparatus

Info

Publication number: WO2012140714A1
Application number: PCT/JP2011/058991
Authority: WO
Inventors: 健三安田
Original assignee: 株式会社アシスト
Priority date: 2011-04-11
Filing date: 2011-04-11
Publication date: 2012-10-18
Also published as: KR101485767B1; JPWO2012140714A1; KR20130137021A; CN103477383B; CN103477383A; JP5721814B2

Abstract

The purpose of the present invention is to efficiently and reliably prevent a black-out phenomenon of a display panel in a display apparatus comprising the display panel, such as a liquid crystal panel, housed in a casing, the display apparatus allowing the viewing of an image or video displayed on the panel in the casing from the outside, the black-out phenomenon being caused by temperature increase due to exposure to direct sunlight or heat generated from the display panel. The display apparatus of the present invention is characterized by being provided with: a casing; a display panel (10) housed in the casing and configured to display an image or video; a viewing portion (6) formed in a part of the casing facing the display panel and made of a transparent member allowing the viewing of the inside of the casing; an air conditioner constituting a heat pump cycle; and cooling air supply means (46, 48) for circulating cooling air cooled by the evaporator of the air conditioner in a space (47) between the viewing portion and the display panel, from the top to the bottom of the display panel.

Description

Display device

The present invention relates to a display device, and more particularly to a display device having a housing and a display panel housed in the housing.

A housing is provided with a housing and a panel housed in the housing to display an image or a video, and at least a part of the housing is a visible portion formed of a transparent material such as glass, thereby providing a housing from the outside. There is known a display device capable of visually recognizing an image or an image displayed on a panel in the body.

In such a display device, for example, when the panel is a liquid crystal panel, heat is generated inside the housing due to the environment outside the housing or the operation of the liquid crystal panel, and the temperature inside the housing is increased. Then, when the temperature inside the housing becomes high and the temperature of the display surface of the liquid crystal panel becomes about 65 ° C. or higher, a blackout phenomenon occurs in which the surface is blackened and an image or video is not displayed, or a transparent glass Condensation may occur on the inner surface of the visible portion formed of a material, and the display device may not function.

In order to prevent the blackout phenomenon, it is conceivable to provide the housing with an air hole communicating the inside and the outside of the housing. By providing the air holes, it is considered that the air inside the casing that has been heated can be discharged to the outside of the casing, and the air temperature inside the casing can be lowered. However, when the display apparatus is disposed outdoors, providing an air hole in the case may cause rain to penetrate inside when it is raining, and it is not preferable to provide the air hole in the case. Therefore, in consideration of the case where the display device is disposed outdoors, it is necessary to prevent the blackout phenomenon of the panel in a state where the housing is sealed.

Therefore, there is known a technique of providing an air conditioner inside the case and maintaining the inside of the case at a predetermined temperature (for example, 30 to 35 ° C.) by the air conditioner to prevent the blackout phenomenon of the liquid crystal panel. .

For example, the technology disclosed in Patent Document 1 includes a hollow stand, a case in which a panel for displaying an image or video is accommodated, and a computer for controlling an image or video signal displayed on the panel. And an air conditioner constituting a heat pump cycle. The hollow stand is connected to the bottom of the case. The computer is disposed in the housing, the evaporator constituting the air conditioner is connected to the opening of the bottom panel of the housing, and the compressor constituting the air conditioner is arranged on the bottom panel of the stand . Further, Patent Document 1 also discloses a structure in which a hollow stand is not provided and a structure in which a computer is provided outside a housing.
Then, the air conditioner can keep the temperature in the housing at a predetermined temperature against changes in weather conditions.

Japanese Patent Application Publication No. 2008-519291

However, according to the prior art disclosed in Patent Document 1, cold air is jetted from the bottom of the case or from the back of the display panel displaying an image or video to keep the entire inside of the case at a predetermined temperature. Therefore, the upper side of the display panel is heated by the heat generated from the display panel, in particular, the heat generated from the display panel, and therefore the air conditioner needs to have a high capacity to prevent the temperature from rising at the top of the display panel. Therefore, there is a problem that the size of the air conditioner increases and the size of the display device increases.

Therefore, in view of the problems of the related art, the present invention relates to a display device capable of housing a display panel such as a liquid crystal panel in a housing and visually recognizing an image or a video displayed on the panel in the housing from outside. An object of the present invention is to provide a display device that efficiently and reliably prevents the display panel blackout phenomenon caused by the increase in temperature due to direct sunlight and the increase in temperature due to heat generation from the display panel.

In order to solve the above-described problems, the present invention is formed on a case, a display panel housed in the case and displaying an image or a video, and a part of the case facing the display panel. An air conditioner that connects a compressor, a condenser, an expansion valve, and an evaporator with a visual recognition unit formed of a transparent member that can visually recognize the inside of the housing and circulates a refrigerant to these devices to configure a heat pump cycle. And cooling air supply means for circulating cooling air cooled by the evaporator of the air conditioner between the viewing portion and the display panel and from above to below the display panel. It is characterized by having.

According to this invention, the display surface of the display panel is cooled by the cooling air by flowing the cooling air cooled by the evaporator between the viewing portion and the display panel from the upper side to the lower side, The temperature of the display panel can be maintained at a predetermined temperature such as 30 to 35.degree.
In particular, since the upper portion is heated by the heat generated from the display panel, the cooling air can be effectively brought into contact with the display panel by flowing the cooling air from the top to the bottom of the display panel, thereby cooling the display panel. It can be done effectively.
As a result, it is possible to effectively prevent the blackout phenomenon of the display panel due to the increase in temperature of the display surface of the panel due to the direct sunlight and the increase in temperature due to the sealing by waterproofing in the housing.

Furthermore, by circulating the cooling air between the visible portion and the display panel, it is possible to prevent the occurrence of dew condensation on the inner surface of the visible portion due to the temperature difference with the outer surface side of the visible portion.
In addition, since it is not necessary to cool the entire space in the housing, and cooling air may be made to flow between the viewing portion and the display panel, the air conditioner does not need to have a high cooling capacity. It can be made compact, and the enlargement of the display device can be prevented.

Further, in the present invention, external air outside the casing is heated by the condenser of the air conditioner, and at least a part of the heated air heated by the condenser is guided to the outer surface of the visual recognition unit, Preferably, a heated air supply means is provided which circulates along the outer surface.

When the heated external air does not flow along the outer surface of the visible portion, the cooling air flows in the space between the visible portion and the display panel so that the outer surface of the visible portion is lower than the ambient temperature outside the housing. Can be considered. In that case, when the outer surface of the visible portion becomes lower than the dew point temperature, dew condensation occurs on the outer surface of the visible portion, and the visibility of the panel via the visible portion is deteriorated. Therefore, even if the cooling air flows through the space and the inner surface of the visual recognition portion is cooled by circulating the heated air along the casing outer surface of the visual recognition portion, the outer surface of the visual recognition portion is heated air Can keep the dew point temperature or higher. Thereby, the occurrence of dew condensation on the surface of the visible portion can be prevented. Moreover, in the air conditioner which comprises a heat pump cycle, since the heat exchange in a condenser is a required thing, the heat heat-exchanged by the condenser can be used effectively.

Further, in the present invention, the heating air supply means distributes the heating air in the same direction as the flow of the cooling air circulated between the visual recognition unit and the display panel by the cooling air supply means. You should do it.

The cooling air flowing in the space between the visual part and the display panel is gradually heated by the heat in the housing and the panel as it flows in the space. On the other hand, the heated air is also cooled by the outside air and the visual recognition unit by flowing along the visual recognition unit.
That is, the temperature of the cooling air in the space is lower as the flow of the cooling air in the space is more upstream, and dew condensation is likely to occur outside the visible portion at that position. Therefore, by circulating the heated air in the same direction as the flow in the space, it is possible to circulate warm heated air at a position where condensation is likely to occur. It can be prevented.

Further, in the present invention, the air conditioner is housed in one air conditioning housing and unitized, and an air conditioning unit disposed inside the casing and the air conditioning unit are disposed below the display panel. The cooling air supply means is provided in a cooling air diffuser provided in the housing and above the display panel, and provided between the cooling air diffuser and between the visual portion and the display panel It is good to comprise by the slit opened.

As described above, since the air conditioner is housed in one air conditioning housing and unitized and disposed as the air conditioning unit in the casing, the air conditioning is performed at the time of failure or maintenance of the compressor, the evaporated product, etc. constituting the heat pump cycle. Since each unit can be replaced as a unit, wiring and piping work is facilitated, and handling of parts at failure or maintenance is facilitated.

Further, the cooling air after flowing from the top to the bottom between the viewing portion and the display panel flows to a position near the air conditioning unit provided below the panel. This facilitates the circulation of the cooling air.
Further, since the air conditioner is heavy, it is not necessary to increase the strength of a support member or the like for holding the air conditioner by unitizing it and providing it below the display panel, preferably at the lowermost portion in the housing. . By this, the enlargement of the display device can be prevented.

Further, in the present invention, the air conditioning unit may be provided with an internal air intake port for taking internal air in a housing into the evaporator on the upper surface of the air conditioning housing.
As a result, the internal air intake port is positioned close to the cooling air after passing between the visual recognition unit and the display panel, and the circulation of the cooling air is facilitated.

Further, in the present invention, it is preferable that a back panel that constitutes a surface on the opposite side to the visible portion of the casing and the air conditioning unit be integrally formed.
Accordingly, when the air conditioner fails or is maintained, it can be coped with by replacing the integrated unit of the back panel and the air conditioning unit, and it becomes easy to cope with the failure or the maintenance of the air conditioner. In addition, if the cooling air passage cooled by the air conditioner is integrated with the back panel, it is only necessary to remove the back panel when replacing the air conditioning unit, and there is no need to remove the passage, etc. It will be easier.

Further, in the present invention, the air conditioning unit is provided with an external air intake port for taking the external air into the condenser on a side surface of the air conditioning housing, and further, in the housing facing the external air intake port of the air conditioning housing. The external air intake may be formed, and the external air intake may be formed on the side of the casing opposite to the visual recognition unit.

A person often stands in front of the visual recognition unit outside the housing in order to view an image or a video displayed on the panel. Therefore, by providing the external air intake port on the side surface of the casing opposite to the visual recognition unit, the flow of air does not occur in front of the visual recognition unit where people often stand. Thus, the air can be reliably taken into the air conditioning unit from the outside of the housing.

Further, in the present invention, a cooling air thermometer for detecting a temperature of cooling air circulated between the visual recognition unit and the display panel, and the visual recognition unit and the display panel based on a detection value of the cooling air thermometer. Temperature control device for controlling the temperature of the cooling air circulated between the two, and environmental information on the inside and outside of the casing including the detected value of the temperature of the cooling air input to the temperature control device via the network And environment information distribution means for distributing to an external network device.

Thus, the air conditioner can be kept operating while the temperature of the cooling air circulated between the visual recognition unit and the display panel is constant.
In addition, by distributing environmental information such as temperature and humidity inside and outside the housing, including the detection value of the cooling air thermometer, to an external network device via a network, the inside and outside of the housing can be externally output. The status can be monitored.
For example, in the case of arranging a plurality of display devices, if the detection value of the thermometer inside the housing at each of the plurality of display devices and the external atmospheric temperature value are distributed to another network device via one network The operating states of multiple display devices can be managed elsewhere.

In the present invention, it is preferable that the air conditioner be accommodated in one air conditioning housing to constitute an air conditioning unit, and that the temperature control device and the environmental information distribution means be also accommodated and disposed in the air conditioning unit. .
As described above, by accommodating and arranging the temperature control device and the environmental information distribution means in the air conditioning unit, the air conditioning unit can be moved for each unit, and it becomes easy to cope with the change of the size and the installation place of the display device. The degree of freedom in device design is improved.

According to the present invention, it is possible to effectively prevent the blackout phenomenon of the display panel caused by the increase in temperature of the display surface of the panel due to direct sunlight and the increase in temperature in the housing caused by the sealing in the housing. The occurrence of dew condensation on the inner surface of the visible portion can also be prevented, and furthermore, the air conditioner can be made compact, and the enlargement of the display device can be prevented.

1 is an exploded perspective view showing a display device according to Embodiment 1. FIG. It is a perspective view showing an air conditioner. It is a flow figure inside an air conditioner. It is a 1st explanatory view explaining composition inside a case. It is the 2nd explanatory view which explains the constitution inside the case. It is 3rd explanatory drawing explaining the composition inside a case. It is the A section enlarged view in FIG. FIG. 13 is an explanatory view showing a configuration inside a housing in Embodiment 2.

Hereinafter, preferred embodiments of the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the component parts described in this embodiment are not intended to limit the scope of the present invention to the scope of the present invention unless specifically stated otherwise, and are merely illustrative. Not too much.

(Embodiment 1)
First, the outline of the configuration of the display apparatus according to the embodiment will be described with reference to FIGS. 1 and 2.
FIG. 1 is an exploded perspective view showing the display device according to the first embodiment.
The display device 1 according to the embodiment includes a housing 2, a panel (display panel) 10, and an air conditioner unit 12.

The housing 2 is formed into a box by combining the main case 4, the tempered glass 6, and the door 8. The tempered glass 6 is transparent so that the inside of the housing 2 can be viewed from the outside through the tempered glass 6. In addition, the door 8 is provided to open and close when inspecting the inside of the housing 2 or the like.

The panel 10 is for displaying an image or a video, and a liquid crystal panel, a plasma display panel or the like can be used.

The air conditioning unit (air conditioning unit) 12 includes a refrigerant circulation path 42 described later, a compressor 32 disposed on the refrigerant circulation path 42, a condenser 34, an expansion valve 36 and an evaporator 38, and other devices constituting a heat pump cycle. Are integrally housed in a casing (air conditioning housing) 13. The air conditioner unit 12 cools the air inside the housing using a heat pump cycle and heats the air outside the housing.

FIG. 2 is a perspective view showing the air conditioner unit 12. As shown in FIG. 2, in the air conditioner unit 12, an inner air intake port 14 for taking in the internal air inside the housing 2 on the upper surface of the casing 13 and a cooled air taken in from the inner air intake port 14 and cooled Cooling air outlets 16 for discharging the inside of the housing 2 are provided. Further, an external air intake port 18 for absorbing external air outside the housing 2 through the external air intake port 24 provided in the door 8 is provided on the side surface of the casing 13 so as to face the external air intake port 24. It is done. A heated air discharge port 20 for discharging heated air taken in from the external air suction port 18 to the outside of the air conditioner unit 12 is provided on the side surface of the casing 13 so as to face the discharge port 26. In addition, 22 is a display part which shows the driving | running state of the air-conditioner unit 12. FIG.

Since the air conditioner unit 12 includes the compressor 32, the condenser 34, the expansion valve 36, and the evaporator 38 therein, the compressor 32 and the evaporator 38, etc. constituting the heat pump cycle may be damaged or maintained. At the same time, since the air conditioning unit 12 can be replaced as a whole, wiring and piping work are facilitated, and handling of parts or maintenance becomes easy.

Next, the principle of the cooling of the internal air and the heating of the external air using the heat pump cycle in the air conditioner unit 12 will be described with reference to FIG. FIG. 3 is a flow diagram of the inside of the air conditioner unit 12. In FIG. 3, devices in a range surrounded by a dotted line c are accommodated in the casing 13.

As shown in FIG. 3, the air conditioner unit 12 includes a compressor 32, a condenser 34, an expansion valve 36, and an evaporator 38 therein. The compressor 32, the condenser 34, the expansion valve 36, and the evaporator 38 are disposed in the above order on the refrigerant circulation path 42 through which the refrigerant such as CO ₂ circulates. Further, a bypass passage 41 connecting the outlet of the compressor 32 and the inlet of the evaporator 38 is provided, and a bypass expansion valve 40 is provided on the bypass passage 41.

The compressor 32 is operated such that the refrigerant discharged from the compressor 32 is brought into a high temperature / high pressure supercritical state above the critical pressure and the critical temperature of the refrigerant. The refrigerant in the supercritical state in the compressor 32 passes through the refrigerant circuit 42 and reaches the condenser 34.

The refrigerant that has reached the condenser 34 is cooled and condensed by the external air a taken in from the external air suction port 18, and changes to a high pressure liquid. The refrigerant condensed by the condenser 34 passes through the refrigerant circuit 42 and reaches the expansion valve 36. On the other hand, the external air a is heated by heat exchange with the refrigerant in the supercritical state in the condenser 34 and becomes hot air and is discharged as heated air from the air conditioner unit 12.

The refrigerant that has been changed to a high pressure liquid by the condenser 34 is depressurized by the expansion valve 36 to change to a low pressure liquid. The refrigerant converted to a low pressure liquid by the expansion valve 36 passes through the refrigerant circuit 42 and reaches the evaporator 38.

The refrigerant reaching the evaporator 38 absorbs heat from the internal air b taken in from the internal air intake port 14 and evaporates. The refrigerant evaporated in the evaporator 38 reaches the compressor 32 through the refrigerant circuit 42. On the other hand, the internal air b is cooled by the heat absorbed by the refrigerant in the evaporator 38, becomes cooling air, and is blown by the evaporator fan 39 as described later.

The bypass passage 41 and the bypass expansion valve 40 are used as needed so that the temperature of the cooling air after being cooled by the evaporator 38 becomes constant. In this case, the refrigerant which is not cooled by the condenser 34 is expanded by the bypass expansion valve 40 to change to a low pressure liquid, and reaches the evaporator 38 at a higher temperature than when passing through the expansion valve 36. The bypass expansion valve 40 is controlled by the temperature control device 70 based on the detected temperature of the cooling air thermometer 72 so that the detected temperature of the cooling air thermometer 72 in the cooling air diffuser 46 described later becomes a predetermined temperature. .

By controlling the opening degree of the bypass expansion valve 40, control to make the temperature of the cooling air after being cooled by the evaporator 38 constant can be maintained while the operating state of the compressor 32 of the air conditioner unit 12 is maintained. . By this, since control which repeats ON and OFF of the compressor 32 is not performed, temperature control of cooling air is stably obtained.

Further, the detection value of the cooling air thermometer 72 taken into the temperature control device 70 is distributed by the environment information distribution means 74 to the external network device 76 via the network 75. By the detection value of the cooling air thermometer 72 being distributed by the network 75, the air temperature state in the housing 2 can be monitored outside the housing 2.
Furthermore, for example, if a plurality of display devices are arranged and the detected value of the cooling air thermometer 72 of each of the plurality of display devices is distributed to other network devices 76 via the network 75, the plurality of display devices at other positions You can manage the state of

In addition to the cooling air thermometer 72, one or more cooling air hygrometers (not shown) and external thermometers and external hygrometers for information concerning external air are provided, and the detected values of these thermometers and hygrometers and the cooling The temperature of the cooling air may be controlled based on the detection value of the air thermometer 72.
As described above, the temperature state of the cooling air is finely controlled by detecting the air state inside the housing 2 and the air state outside using the thermometer and the hygrometer, and performing temperature control of the cooling air using the information. It will be possible.
Furthermore, environmental information such as temperature and humidity related to the air condition inside the housing 2 and the external air condition are distributed by the environment information distribution means 74 via the network 75, so that a plurality of display devices can be displayed at other places. It is possible to understand the internal and external environmental conditions in detail and manage multiple display devices based on these data.

Further, the temperature control device 70 and the environment information distribution means 74 are housed and arranged in the air conditioner unit 12. By accommodating the temperature control device 70 and the environmental information distribution means 74 in the air conditioner unit 12, the air conditioner unit 12 can be moved for each unit, so it becomes easy to cope with changes in the size of the display device 1 and the installation location. The degree of freedom in design of the display device 1 is improved.

Next, the internal configuration of the case constituting the display device 1 will be described in detail.
FIG. 4 is a first explanatory view for explaining the internal configuration of the housing, and the left side 4a of the main case 4 shown in FIG. 1 and the left side 12a of the air conditioner unit 12 shown in FIG. It is explanatory drawing which shows the outline | summary of the left side of the display apparatus 1 which concerns on Embodiment 1 drawn as FIG.
FIG. 5 is a second explanatory view for explaining the internal configuration of the housing, omitting the right side 4b of the main case 4 shown in FIG. 1 and the right side 12b of the air conditioner unit 12 shown in FIG. It is explanatory drawing which shows the outline | summary of the right side of the display apparatus 1 which concerns on Embodiment 1 drawn as FIG.
FIG. 6 is a third explanatory view for explaining the internal configuration of the housing, in which the door 8 shown in FIG. 1 and the back surface 12c of the air conditioner unit 12 shown in FIG. FIG. 6 is an explanatory view showing an outline of a back surface of the display device 1 according to mode 1;
FIG. 7 is an enlarged view of a portion A in FIG.

As shown in FIGS. 4 and 6, a hose 44 is connected to the cooling air discharge port 16. The hose 44 is connected to a cooling air diffuser 46 installed at the upper inside of the housing 2. The cooling air diffuser 46 is provided in a range over the entire width direction of the panel 10 as shown in FIG. 6, and in its lower part, the internal air is jetted into the space 47 between the panel 10 and the tempered glass 6 A slit-like cooling air jet 48 is provided.
The cooling air diffuser 46 and the slit-like cooling air jet port 48 constitute a cooling air supply means 53 that jets the cooling air with the space between the viewing portion and the display panel facing downward.

Further, as shown in FIG. 5, a heating air branch passage 52 is connected to the heating air discharge port 20. The heating air branch passage 52 is connected to the discharge port 26 provided in the door 8 and reaches a booster fan 54 provided in the inside of the housing 2. The heating air passage 60 is connected to the discharge side of the booster fan 54. The heating air passage 60 is connected to a heating air diffuser 56 provided at the top of the housing 2. The heating air diffuser 56 is provided in a range over the entire width direction of the panel 10 as shown in FIG. 6, and a heating air jet 58 for jetting the air along the outer surface of the tempered glass 6 is provided. .
The heating air diffuser 56 and the heating air jet 58 constitute heating air supply means 59 for ejecting air along the outer surface of the tempered glass 6.

In the display device 1 configured as described above, the cooling air cooled by the heat absorbed by the refrigerant in the evaporator 38 is blown by the evaporator fan 39. The cooling air blown by the evaporator fan 39 is supplied to the cooling air diffuser 46 through the cooling air discharge port 16 and the hose 44. The cooling air supplied to the cooling air diffuser 46 is spouted downward from the cooling air spout 48 in the space 47 between the tempered glass 6 and the panel 10. The cooling air jetted into the space 47 flows downward from above in the space 47 and is again drawn into the evaporator 38 through the internal air intake port 14.

That is, the cooling air circulates in the following order: evaporator 38 → evaporator fan 39 → cooling air outlet 16 → hose 44 → cooling air diffuser 46 → cooling air jet 48 → space 47 → internal air intake 14 → evaporator 38 Do.
The cooling air cooled by the evaporator 38 flows through the space 47, whereby the panel 10 is cooled by the cooling air, and the temperature of the panel 10 can be maintained at a predetermined temperature (for example, 30 to 35 ° C.). Thereby, the blackout phenomenon of the panel 10 can be prevented. Moreover, since it is not necessary to cool the entire inside of the housing 2 and it is sufficient to flow cooling air into the space 47 between the tempered glass 6 and the panel 10, the air conditioner unit 12 does not need high cooling capacity. The unit 12 can be configured compactly.

On the other hand, the external air taken into the housing 2 from the external air intake port 24 provided in the door 8 is filtered by the air filter 50 provided between the external air intake port 24 and the external air intake port 18. After impurities such as dust and dirt are removed, the air is sucked into the air conditioner unit 12 from the external air suction port 18.
The external air drawn into the air conditioning unit 12 is fed to the condenser 34 by the condenser fan 35 and then heated by heat exchange with the refrigerant in the condenser 34. The external air heated by the condenser 34 is introduced into the heating air branch passage 52 as heating air. A portion of the heated air guided to the heated air branch path 52 is discharged to the outside of the housing 2 from the discharge port 26, and a remaining portion is supplied to the heated air diffuser 56 through the heated air passage 60 by the booster fan 54. Be done. The heated air supplied to the heated air diffuser 56 is jetted downward along the outer surface of the tempered glass 6 from the heated air jet 58.

That is, the heating air flows in the order of the external air intake port 24 → the air filter 50 → the condenser fan 35 → the condenser 34 → the heating air branch passage 52. Part of the heating air flowing through the heating air branch passage 52 is discharged to the outside from the discharge port 26, and the remaining part is the booster fan 54 → heating air passage 60 → heating air diffuser 56 → heating air spout 58 → tempered glass 6 It flows in order of the housing 2 exterior along the outer surface of.

In the case where the heating air does not flow along the outer surface of the tempered glass 6, it is conceivable that the outer surface of the tempered glass 6 becomes lower than the ambient temperature outside the housing 2 by the cooling air flowing in the space 47. In that case, when the outer surface of the tempered glass 6 becomes the dew point temperature or less, dew condensation occurs on the outer surface of the tempered glass 6 and the visibility of the panel 10 through the tempered glass 6 is deteriorated.
In this embodiment, the heating air heated by the condenser 34 flows along the outer surface of the tempered glass 6 to strengthen even if the cooling air flows through the space 47 and the inner surface of the tempered glass 6 is cooled. The outer surface of the glass 6 can be heated by the heated air to maintain the dew point temperature or higher. Thereby, the occurrence of condensation on the surface of the tempered glass 6 can be prevented.

Second Embodiment
The second embodiment will be described with reference to FIG. FIG. 8 is a view corresponding to FIG. 4 and is a display device 1 drawn with the left side 4 a of the main case 4 shown in FIG. 1 and the left side 12 a of the air conditioner unit 12 shown in FIG. It is explanatory drawing which shows the outline | summary of the left side of. In FIG. 8, the same reference numerals as in FIGS. 1 to 7 denote the same components, and the description thereof will be omitted.

In the second embodiment, the air conditioner unit 12 is integrated with the door 8 which is a back panel that constitutes the surface opposite to the tempered glass 6. Further, the hose 44 is connected to a cooling air passage 45 integrated with the door 8. The cooling air passage 45 is in communication with the cooling air diffuser 46 via the cooling air flow port 51 when the door 8 is closed. Reference numeral 49 denotes a cushion for cushioning the impact of the collision between the cooling air diffuser 46 and the cooling air passage 45 when the door 8 is opened and closed.

According to the second embodiment, the failure or maintenance of the air conditioner unit 12 can be coped with by replacing the integrated unit of the door 8 and the air conditioner unit 12, and the failure or maintenance of the air conditioner unit 12 can be handled. It is easy. Furthermore, since the cooling air passage 45, which is a passage for cooling air cooled by the air conditioning unit 12, is integrated with the door 8, the cooling air passage 45 is integrated with the door 8 by removing the door 8 when replacing the air conditioning unit 12. Therefore, it is not necessary to separately remove the cooling air passage 45 separately, and it becomes easier to cope with failure or maintenance.

According to the present invention, it is possible to effectively prevent the blackout phenomenon of the display panel caused by the increase in temperature of the display surface of the panel due to direct sunlight and the increase in temperature in the housing caused by the sealing in the housing. Since the occurrence of condensation on the inner surface of the visual recognition part can be prevented and the air conditioner can be made compact, it is suitable for use in a display device having a display panel for displaying an image or a video.

1 Display Device 2 Housing 6 Tempered Glass (Viewing Part)
8 door (back panel)
10 panel (display panel)
12 Air conditioning unit (air conditioning unit)
13 Casing (Air conditioning housing)
14 internal air intake 16 cooling air outlet 32 compressor 34 condenser 36 expansion valve 38 evaporator 46 internal air diffuser 48 internal air jet (slit)
53 Cooling air supply means 59 Heating air supply means 70 Temperature control device 74 Environmental information distribution means

Claims

And
A display panel housed in the housing to display an image or a video;
A viewing portion formed of a transparent member that is formed on a part of the housing facing the display panel and that allows the inside of the housing to be viewed;
An air conditioner that connects a compressor, a condenser, an expansion valve, and an evaporator and circulates a refrigerant to these devices to configure a heat pump cycle;
Cooling air supply means for circulating the cooling air cooled by the evaporator of the air conditioner between the viewing portion and the display panel and from the top of the display panel toward the bottom A display device characterized by
The external air outside the housing is heated by the condenser of the air conditioner, and at least a portion of the heated air heated by the condenser is led to the outer surface of the visual recognition portion and circulated along the outer surface The display apparatus according to claim 1, further comprising: a heating air supply unit configured to perform control.
The heating air supply means distributes the heating air so as to be in the same direction as the flow of the cooling air flowing between the visual recognition unit and the display panel by the cooling air supply means. The display device according to claim 2.
The air conditioning unit is housed in one air conditioning housing to form a unit, and an air conditioning unit disposed inside the housing,
The air conditioning unit is disposed below the display panel,
The cooling air supply means
A cooling air diffuser provided in the housing above the display panel;
The display device according to claim 1, wherein the display device is configured by a slit provided in the cooling air diffuser and opened toward the viewing portion and the display panel.
5. The display device according to claim 4, wherein the air conditioning unit is provided with an internal air intake port for taking in internal air in a housing into the evaporator on an upper surface of the air conditioning housing.
The display apparatus according to claim 4 or 5, wherein a back panel constituting a surface on the opposite side to the visual recognition part of the housing and the air conditioning unit are integrally formed.
The air conditioning unit is provided with an external air intake port for taking the external air into the condenser on a side surface of the air conditioning housing, and further, an external air intake port is formed in the housing facing the external air intake port of the air conditioning housing. The display device according to claim 4 or 5, characterized in that:
A cooling air thermometer for detecting the temperature of the cooling air circulated between the visual recognition unit and the display panel;
A temperature control device for controlling a temperature of cooling air circulated between the visual recognition unit and the display panel based on a detection value of the cooling air thermometer;
Providing environment information distribution means for distributing environment information inside and outside of the case including the detected value of the cooling air temperature input to the temperature control device to an external network device via a network The display device according to claim 1, characterized in that:
The air conditioning unit is housed in one air conditioning housing to constitute an air conditioning unit, and the temperature control device and the environmental information distribution means are also housed and arranged in the air conditioning unit. Display device as described.