JP2012118130A - Display device and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which continuously suppresses condensation while securing safety of a cooling part.SOLUTION: A display device includes a compressor-type cooler 30 having a condenser 33 adapted to condense a refrigerant by releasing heat, an evaporator 31 adapted to absorb heat and perform dehumidification by evaporating the refrigerant, and a compressor 32 adapted to draw vapor generated from the evaporator 31 and increase a pressure until the vapor is condensed, and stops the compressor 32 at a temperature equal to or lower than a first predetermined temperature. The display device further includes a temperature sensor for monitoring a temperature of the evaporator 31 and a backlight 13, and increases a level of the backlight 13 when the evaporator 31 becomes equal to or lower than a second predetermined temperature which is higher than the first predetermined temperature.

Description

  The present invention relates to a display device that displays an image and an electronic apparatus.

  In recent years, display devices such as liquid crystal display devices have been installed in towns for purposes such as digital signage (advertisement media using images). Usually, such a display device can be installed not only indoors but also outdoors, and thus has a sealed structure that prevents water and dust from entering. In addition, such a display device is configured to be able to display with high brightness in order to ensure outdoor visibility.

  When the display device displays an image with high brightness or when the display device is irradiated with sunlight, heat is generated inside the housing. When the display device has a sealed structure as described above, heat generated inside the housing is not easily released to the outside of the housing. As a result, the temperature inside the housing rises, the liquid crystal of the liquid crystal display device changes to a liquid, the orientation is lost, and display may not be performed.

  Therefore, for example, Patent Document 1 proposes a liquid crystal display device configured to cool liquid crystal by a cooling device using a compressor.

JP 2010-164484 A

  However, in the liquid crystal display device described above, dew condensation inside the housing may become a problem due to its sealing property. Especially in the cold season of winter, the outside air temperature is lower than the temperature inside the sealed enclosure, so condensation may occur due to the temperature difference. Due to this dew condensation, the protective glass on the front surface of the liquid crystal panel is clouded and the visibility of the image displayed on the liquid crystal panel is reduced. In order to avoid this, it is conceivable to prevent dew condensation by operating the cooler and performing dehumidification when the humidity exceeds a certain level. However, if the cooler is operated at a time when the ambient temperature is low, the evaporation temperature decreases, and the refrigerant pressure in the evaporator becomes too low, which is dangerous.

  Then, an object of this invention is to provide the display apparatus which suppresses dew condensation continuously, ensuring the safety | security of a cooler.

  In order to achieve the above object, a display device according to the present invention includes a condenser that condenses the refrigerant by heat dissipation, an evaporator that absorbs heat and dehumidifies by evaporating the refrigerant, and sucks the vapor generated from the evaporator to generate the vapor. A display device comprising a compressor-type chiller including a compressor for increasing the pressure until condensation, and stopping the compressor when the temperature is lower than a first predetermined temperature, and further monitoring a temperature of the evaporator And a control unit that increases the level of the backlight when the temperature of the evaporator is equal to or lower than a second predetermined temperature that is higher than the first predetermined temperature.

  In addition, the display device having the above-described configuration further includes a humidity sensor that measures humidity, and the control unit operates the cooler when the humidity exceeds a predetermined humidity. In this case, the evaporator has a second predetermined temperature. Raises the backlight level when:

  The electronic device of the present invention operates a compressor including at least a compressor, a temperature sensor that measures temperature, a humidity sensor that measures humidity, and a temperature sensor that measures a temperature higher than the first temperature. And a controller that stops the compressor when the measured temperature is lower than the second temperature, which is lower than the first temperature, and the controller further includes the measured temperature between the first temperature and the second temperature. Moreover, the compressor is also operated when the humidity measured by the humidity sensor is higher than a predetermined humidity.

  The electronic device having the above configuration further includes a display unit and an illumination unit that illuminates the display unit, and the control unit outputs the output of the illumination unit when the measured temperature is the first temperature or the second temperature. Raise.

  If it is the structure of this invention, it will become possible to suppress dew condensation continuously, ensuring the safety | security of a cooling unit.

  The significance or effect of the present invention will be further clarified by the following description of one embodiment. However, the embodiment described below is merely one of the embodiments of the present invention, and the meaning of the terms of the present invention or each constituent element is limited to those described in the following embodiments. It is not a thing.

These are the perspective views which show schematic structure of the display apparatus in one Embodiment of this invention. These are sectional drawings which show schematic structure of the display apparatus in one Embodiment of this invention. These are sectional drawings which show schematic structure of the display apparatus in one Embodiment of this invention. These are figures which show schematic structure of the cooler shown in FIG. These are block diagrams which show schematic structure of the display apparatus in one Embodiment of this invention. These are the flowcharts which show the 1st example of the temperature / humidity control operation | movement of the display apparatus in one Embodiment of this invention. These are flowcharts which show the 2nd example of the temperature / humidity control operation | movement of the display apparatus in one Embodiment of this invention.

  Hereinafter, an embodiment of a display device according to the present invention will be described with reference to the drawings. First, a schematic structure of the display device will be described with reference to FIGS.

<Schematic structure of display device>
FIG. 1 is a perspective view showing a schematic structure of a display device according to an embodiment of the present invention. As shown in FIG. 1, the display device 1 includes an upper housing 10 provided in the upper portion and a lower housing 20 provided in the lower portion. The upper casing 10 is provided with a window portion 11 that allows an image displayed inside the upper casing 10 to be visually recognized. The window part 11 consists of material transparent with respect to visible lights, such as glass.

  FIG. 2 is a cross-sectional view showing a schematic structure of the display device according to the embodiment of the present invention, and shows a cross section taken along the line AA of FIG. The AA cross section of FIG. 1 is a cross section that is substantially perpendicular to the image display surface (a surface parallel to the paper surface of FIG. 1).

  As shown in FIG. 2, inside the upper housing 10 are a liquid crystal panel 12 that displays an image, a backlight 13 that irradiates light to the liquid crystal panel 12, and a fan 14 </ b> U that circulates air in the upper housing 10. , 14D, temperature sensors 15RU, 15RD (see FIG. 3 for details) for detecting the temperature in the upper casing 10, humidity sensors 17RU, 17RD for detecting the humidity in the upper casing 10, and the inside of the upper casing 10 are cooled. And an evaporator 31 for dehumidification.

  Further, as shown in FIG. 2, the lower housing 20 includes a compressor 32 that compresses the refrigerant, a condenser 33 that condenses the refrigerant compressed by the compressor 32 by heat dissipation, and a refrigerant that the condenser 33 condenses. And an expansion valve 34 for expanding the pressure. The above-described evaporator 31 absorbs heat by evaporating the refrigerant expanded by the expansion valve 34. The compressor 32 compresses the refrigerant evaporated by the evaporator 31. The evaporator 31, the compressor 32, the condenser 33, and the expansion valve 34 are included in the cooler 30. The details of the configuration and operation of the cooler 30 will be described later.

  The liquid crystal panel 12 displays an image by selectively transmitting the light emitted from the backlight 13 by controlling the alignment of the liquid crystal. An image displayed on the liquid crystal panel 12 is viewed from the outside of the upper housing 10 through the window portion 11. Note that the backlight 13 may include a linear light source such as a fluorescent tube, or may include a point light source such as a light emitting diode. Further, the backlight 13 may include a diffusion plate that irradiates the liquid crystal panel 12 with planar light by diffusing the light emitted from the light source, a reflection plate that reflects the light emitted from the light source, and the like. Absent.

  The fan 14 </ b> D is disposed at the lower part of the upper casing 10 and diffuses the air below the upper casing 10 cooled by the evaporator 31 to the surface of the liquid crystal panel 12. The fan 14 </ b> U is disposed at the upper part of the upper casing 10, and sends the air above the upper casing 10 to the evaporator 31. By circulating the air in the upper housing 10 by the fans 14D and 14U, the liquid crystal panel 12 is effectively cooled, and normal display of an image is enabled. Note that the number and location of the fans 14D and 14U are not limited to this example, and other arrangement modes may be used. Further, in the following, for simplification of description, the fans 14D and 14U are collectively expressed as a blower unit 14.

  FIG. 3 is a cross-sectional view showing a schematic structure of the display device according to the embodiment of the present invention, and shows a cross section taken along the line BB of FIG. 1 is a cross section substantially parallel to the image display surface (a surface parallel to the paper surface of FIG. 1).

  As shown in FIG. 3, four temperature sensors 15RU, 15RD, 15LU, and 15LD and four humidity sensors 17RU are provided in the upper housing 10 and between the window 11 and the liquid crystal panel 12 (see FIG. 2). , 17RD, 17LU, 17LD are arranged. For example, the temperature sensors 15RU, 15RD, 15LU, and 15LD are composed of elements that can detect the temperature, such as a thermistor. Further, for example, the humidity sensors 17RU, 17RD, 17LU, and 17LD can detect the humidity of a polymer humidity detecting element (an element that detects humidity from a change in electrical characteristics (resistance, capacitance, etc.) of the polymer in accordance with moisture). It consists of various elements.

  The temperature sensor 15RU and the humidity sensor 17RU are vertically above the window portion 11 and the liquid crystal panel 12 (see FIG. 2) (hereinafter referred to as the upper side, the lower side is also expressed in the same manner), and from the inside of the upper housing 10 Arranged on the right side in the horizontal direction when viewing the part 11 (hereinafter referred to as the right side, the left side is also expressed in the same manner). The temperature sensor 15RD and the humidity sensor 17RD are disposed below and on the right side of the window portion 11 and the liquid crystal panel 12. The temperature sensor 15LU and the humidity sensor 17LU are arranged on the upper side and the left side of the window part 11 and the liquid crystal panel 12. The temperature sensor 15LD and the humidity sensor 17LD are disposed below and on the left side of the window 11 and the liquid crystal panel 12. The number and location of the temperature sensors 15RU, 15RD, 15LU, and 15LD and the humidity sensors 17RU, 17RD, 17LU, and 17LD are not limited to this example, and other arrangement modes may be used. For example, only one humidity sensor may be provided near the evaporator 31. In addition, for simplification of description below, the temperature sensors 15RU, 15RD, 15LU, and 15LD are collectively expressed as a housing temperature sensor 15, and the humidity sensors 17RU, 17RD, 17LU, and 17LD are collectively referred to as the housing humidity sensor 17. Express.

<Schematic structure of the cooler>
Next, a schematic structure of the cooler 30 shown in FIG. 2 will be described with reference to FIG. 4 is a diagram showing a schematic structure of the cooler shown in FIG.

  As shown in FIG. 4 and as described with reference to FIG. 2, the cooler 30 includes an evaporator 31, a compressor 32, a condenser 33, and an expansion valve 34. The cooler 30 has no refrigerant in and out in a series of cooling operations (cooling cycle).

  The compressor 32 compresses the refrigerant evaporated by the evaporator 31 to bring it into a high temperature and high pressure state. The condenser 33 condenses the refrigerant compressed by the compression unit 32 by heat exchange (heat radiation). A fan for promoting heat exchange in the condenser 33 may be provided.

  The expansion valve 34 expands the refrigerant condensed by the condenser 33 to make the refrigerant low temperature and low pressure. The evaporator 31 evaporates the refrigerant expanded by the expansion valve 34 by heat exchange (heat absorption). At this time, moisture contained in the air in the upper housing 10 is condensed on the evaporator 31. The moisture condensed on the evaporator 31 is discarded outside the upper casing 10. A fan for promoting heat exchange and dehumidification in the evaporator 31 may be provided.

  The cooler 30 cools and dehumidifies the inside of the upper housing 10 by sequentially changing the state of the refrigerant and exchanging heat as described above.

  Further, an evaporator temperature sensor 311T for detecting the temperature of the evaporator 31 and an evaporator pressure sensor 311P for detecting the pressure of the evaporator 31 are provided at the inlet of the evaporator 31, respectively. On the other hand, a condenser temperature sensor 331T for detecting the temperature of the condenser 33 and a condenser pressure sensor 331P for detecting the pressure of the condenser 33 are provided at the outlet of the condenser 33, respectively.

  The evaporator temperature sensor 311T and the condenser temperature sensor 331T include an element capable of detecting temperature, such as a thermistor, for example. The evaporator temperature sensor 311T indirectly detects the temperature of the refrigerant flowing into the evaporator 31 (the temperature of the refrigerant after being expanded by the expansion valve 34 and before being evaporated by the evaporator 31) from the outside. The condenser temperature sensor 331T indirectly detects the temperature of the refrigerant flowing out of the condenser 33 (the temperature of the refrigerant after being condensed by the condenser 33 and before being expanded by the expansion valve 34) from the outside. Therefore, the evaporator temperature sensor 311T and the condenser temperature sensor 331T can be interpreted as detecting the temperature of the refrigerant. Further, the evaporator pressure sensor 311P and the condenser pressure sensor 331P include an element capable of detecting pressure such as a strain gauge (deformation of a diaphragm due to the pressure of the refrigerant), for example.

  If there is no refrigerant going in and out of the cooler 30 (if it is a closed system), the pressure and temperature have a one-to-one correspondence (one is determined and the other is determined). Therefore, the refrigerant pressure can be grasped by referring to the temperature detected by the evaporator temperature sensor 311T, and the refrigerant temperature can be grasped by referring to the pressure detected by the evaporator pressure sensor 311P. Similarly, the refrigerant pressure can be grasped by referring to the temperature detected by the condenser temperature sensor 331T, and the refrigerant temperature can be grasped by referring to the pressure detected by the condenser pressure sensor 331P. .

<Temperature and humidity control operation>
The temperature / humidity control operation of the display device according to the embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a block diagram showing a schematic configuration of the display device according to the embodiment of the present invention.

  As shown in FIG. 5, the display device 1 includes a control unit 16 that controls operations of the cooler 30, the liquid crystal panel 12, the backlight 13, and the air blowing unit 14 described above. Moreover, the control part 16 acquires each detection result of the housing temperature sensor 15, the housing humidity sensor 17, the evaporator temperature sensor 311T, and the condenser temperature sensor 331T. The control unit 16 shown in FIG. 5 mainly controls the temperature of the display device 1 (particularly, in the upper housing 10 in which the liquid crystal panel 12 and the backlight 13 are disposed) and also controls humidity (suppresses condensation). (Details will be described later).

  The cooler 30 stops when the pressure of the evaporator 33 detected by the evaporator pressure sensor 311P becomes equal to or lower than the threshold pressure Pe1. For example, the threshold pressure Pe1 may be a lower limit pressure at which the safety of the cooler 30 is ensured (for example, a pressure equal to or lower than a pressure corresponding to a threshold temperature Te1 described later, examples of specific values will be described later). The cooler 30 stops when the pressure of the evaporator 33 detected by the condenser pressure sensor 331P becomes equal to or higher than the threshold pressure Pc1. For example, the threshold pressure Pc1 may be an upper limit pressure (specifically, for example, a pressure corresponding to the temperature of the evaporator 33) of which the safety of the cooler 30 is guaranteed.

  The cooler 30 may be stopped when the pressure of the evaporator 33 detected by the evaporator pressure sensor 311P becomes equal to or higher than the threshold pressure Pe2. For example, the threshold pressure Pe2 may be an upper limit pressure at which the cooler 30 can exhibit the cooling capacity. The cooler 30 may be stopped when the pressure of the evaporator 33 detected by the condenser pressure sensor 331P becomes equal to or lower than the threshold pressure Pc2. For example, the threshold pressure Pc2 may be a lower limit pressure at which the cooler 30 can exhibit the cooling capacity.

  In addition, the control unit 16 may perform stop control according to the pressure of the cooler 30 as described above. In this case, the control unit 16 refers to not only the detection results of the evaporator temperature sensor 311T and the condenser temperature sensor 331T but also the detection results of the evaporator pressure sensor 311P and the condenser pressure sensor 331P. If comprised in this way, the control part 16 will perform the control according to the temperature mentioned later, and the control according to said pressure integrally.

[First example]
FIG. 6 is a flowchart showing a first example of the temperature and humidity control operation of the display device according to the embodiment of the present invention. Note that the temperature and humidity control operation shown in FIG. 6 can be repeatedly performed by the control unit 16 during the operation of the display device 1.

  As shown in FIG. 6, when the temperature and humidity control operation is started, the control unit 16 first confirms the temperature in the upper housing 10 by referring to the detection result of the housing temperature sensor 15 (STEP 1). For example, the control unit 16 refers to the detection results of the four temperature sensors 15RU, 15RD, 15LU, and 15LD that form the enclosure temperature sensor 15.

  The control unit 16 confirms whether or not the confirmed temperature in the upper casing 10 is equal to or higher than the threshold temperature Th (STEP 2). For example, the control unit 16 confirms whether or not the temperature detected by at least one of the four temperature sensors 15RU, 15RD, 15LU, and 15LD constituting the enclosure temperature sensor 15 is equal to or higher than the threshold temperature Th. For example, the threshold temperature Th is an upper limit temperature at which normal display of the liquid crystal panel 12 is guaranteed. Specifically, for example, the threshold temperature Th is 43 ° C.

  When it is confirmed that the temperature in the upper housing 10 is equal to or higher than the threshold temperature Th (STEP 2, YES), the controller 16 drives the cooler 30 (or continues the driving state) (STEP 3). At this time, the control unit 16 may drive the blowing unit 14 in conjunction with the cooler 30 (or continue the driving state).

  On the other hand, when the control unit 16 confirms that the temperature in the upper housing 10 is lower than the threshold temperature Th (STEP 2, NO), the controller 16 then confirms the humidity in the upper housing 10 (STEP 4). For example, the control unit 16 refers to the detection results of the four humidity sensors 17RU, 17RD, 17LU, and 17LD that form the enclosure humidity sensor 17.

  The control unit 16 confirms whether the confirmed humidity in the upper housing 10 is equal to or higher than the threshold humidity Hh (STEP 5). For example, the control unit 16 confirms whether or not the humidity detected by at least one of the four humidity sensors 17RU, 17RD, 17LU, and 17LD constituting the enclosure temperature sensor 15 is equal to or higher than the threshold humidity Hh. For example, the threshold humidity Hh is a lower limit humidity at which condensation is expected. Specifically, for example, the threshold humidity Hh is 80%.

  When it is confirmed that the humidity in the upper housing 10 is equal to or higher than the threshold humidity Hh (STEP 5, YES), the controller 16 drives the cooler 30 (or continues the driving state) in the same manner as above (STEP 3). On the other hand, when the controller 16 confirms that the humidity in the upper housing 10 is lower than the threshold humidity Hh (STEP 5, NO), it stops driving the cooler 30 (or continues the driving stop state) (STEP 6). ), End the temperature and humidity control operation. At this time, the control unit 16 may stop driving the blower unit 14 (or continue the drive stop state) in conjunction with the cooler 30.

  When the cooling unit 30 is driven, the control unit 16 refers to the detection result of the evaporator temperature sensor 311T to confirm the temperature of the evaporator 31 (STEP 7).

  The control unit 16 confirms whether or not the confirmed temperature of the evaporator 31 is equal to or lower than the threshold temperature Te2 (STEP 8). For example, the threshold temperature Te2 is within the range in which the pressure of the corresponding evaporator 31 is sufficiently ensured for the safety of the cooler 30 (particularly the evaporator 31), but the lower limit temperature corresponding to the lower limit pressure of the range. The temperature is close to (for example, a threshold temperature Te1 described later). In other words, the threshold temperature Te2 is a temperature at which the temperature of the evaporator 31 is expected to be lower than the lower limit temperature if the operation of the display device 1 is continued when the temperature of the evaporator 31 is lower than that. is there.

  When the controller 16 confirms that the temperature of the evaporator 31 is higher than the threshold temperature Te2 (STEP 8, NO), the temperature / humidity control operation ends. On the other hand, when it is confirmed that the temperature of the evaporator 31 is equal to or lower than the threshold temperature Te2 (STEP 8, YES), the control unit 16 performs output control of the backlight 13 (or continues output control) (STEP 9). The level control of the backlight 13 is control of the output (light quantity to be irradiated) of the backlight 13 and can be interpreted as control of electric power supplied to the backlight 13.

  Specifically, for example, when the control unit 16 confirms that the temperature of the evaporator 31 is −10 ° C. or less, the level of the backlight 13 (the maximum time is 100%; the same applies hereinafter) is about 65%. Adjust so that Furthermore, if the control part 16 confirms that the temperature of the evaporator 31 is -12 degrees C or less, it will adjust so that the level of the backlight 13 may be set to about 80%. When the level of the backlight 13 is set to be larger than the above value, the control unit 16 does not need to make the level of the backlight 13 close to the above value. That is, the above value may be set as the lower limit value.

  The above specific values are merely examples, and the control unit 16 may adopt any value when adjusting the level of the backlight 13. However, the control unit 16 adjusts so that the level of the backlight 13 increases as the temperature of the evaporator 31 decreases. The relationship between the temperature of the evaporator 31 and the level of the backlight 13 adjusted by the control unit 16 may be linear or non-linear.

  Further, the control unit 16 confirms whether or not the confirmed temperature of the evaporator 31 is equal to or lower than the threshold temperature Te1 that is lower than the threshold temperature Te2 (STEP 10). For example, the threshold temperature Te1 is a lower limit temperature corresponding to the lower limit pressure in a range where the safety of the cooler 30 (particularly the evaporator 31) is sufficiently guaranteed. Specifically, for example, the threshold temperature Te1 is −15 ° C. In the case of this example, the temperature of the evaporator 31 corresponding to the threshold pressure Pe1 at which the cooler 30 stops may be −18 ° C.

  When the controller 16 confirms that the temperature of the evaporator 31 is higher than the threshold temperature Te1 (STEP 10, NO), the temperature / humidity control operation ends. On the other hand, when it is confirmed that the temperature of the evaporator 31 is equal to or lower than the threshold temperature Te1 (STEP 10, YES), the control unit 16 stops the cooler 30 (STEP 11) and ends the temperature and humidity control operation. At this time, the control unit 16 may stop the liquid crystal panel 12 and the backlight 13 together with the stop of the cooler 30.

  If comprised as mentioned above, it will become possible to suppress dew condensation continuously, ensuring the safety of the cooler 30.

[Second example]
FIG. 7 is a flowchart showing a second example of the temperature and humidity control operation of the display device according to the embodiment of the present invention. Note that, similarly to the first example, the temperature and humidity control operation illustrated in FIG. 7 can be repeatedly performed by the control unit 16 during the operation of the display device 1. In the description of the temperature / humidity control operation of the second example below, detailed description of the same operations and effects as those of the first example will be omitted.

  As shown in FIG. 7, when the temperature and humidity control operation is started, the control unit 16 first checks the temperature in the upper housing 10 (STEP 21). Moreover, the control part 16 confirms whether the temperature in the confirmed upper housing 10 is more than threshold temperature Th (STEP22). When the controller 16 confirms that the temperature in the upper housing 10 is lower than the threshold temperature Th (STEP 22, NO), the controller 16 confirms the humidity in the upper housing 10 (STEP 23). When the controller 16 confirms that the humidity in the upper housing 10 is lower than the threshold humidity Hh (STEP 24, YES), the controller 16 stops driving the cooler 30 (STEP 25) and ends the temperature and humidity control operation. The operations in the above STEPs 21 to 25 are the same as those in STEPs 1, 2, 4 to 6 in the first example.

  When the controller 16 confirms that the temperature in the upper casing 10 is equal to or higher than the threshold temperature Th (STEP 22, YES), the controller 16 drives the cooler 30 (or continues the driving state) (STEP 26) to control the temperature and humidity. End the operation.

  When the control unit 16 confirms that the temperature in the upper housing 10 is lower than the threshold temperature Th (STEP 22, NO) and the humidity in the upper housing 10 is lower than the threshold humidity Hh (STEP 24, NO), cooling is performed. The machine 30 is driven (or the drive state is continued) (STEP 27). Further, the control unit 16 performs output control of the backlight 13 (or continues output control) (STEP 28), and performs the temperature and humidity control operation. finish.

  As the output control of the backlight 13, the control unit 16 performs control to adjust the level of the backlight 13 to a predetermined value (for example, about 80%) independent of the temperature of the evaporator 31. Note that when the level of the backlight 13 is set to be larger than the predetermined value, the control unit 16 may not bring the level of the backlight 13 close to the predetermined value. That is, the predetermined value may be set as the lower limit value.

  If comprised like this example, it will become possible to suppress that the level of the backlight 13 is adjusted unnecessarily.

  In the backlight output control (STEP 28) of this example, the control unit 16 adjusts the level of the backlight 13 to a predetermined value that does not depend on the temperature of the evaporator 31, but depends on the temperature of the evaporator 31. It may be adjusted to a value (for example, the same value as in the first example). Moreover, the control part 16 may perform STEP7-11 of 1st example instead of STEP28.

<Modification>
In the temperature and humidity control operation of FIGS. 6 and 7, the control unit 16 may perform control to suppress frequent driving and stopping of the cooler 30. For example, in STEP 2 in FIG. 6 and STEP 22 in FIG. 7, the threshold temperature Th when the cooler 30 is driven (for stopping the drive of the cooler 30) is You may set so that it may become sufficiently larger than threshold temperature Th for driving (for example, 38 degreeC at the time of a drive, 43 degreeC at the time of a stop). Further, for example, the controller 16 may control the cooler 30 not to stop unless a predetermined time (for example, 10 minutes) elapses after the cooler 30 is driven, and vice versa. (After the cooler 30 is stopped, it is not driven before a predetermined time elapses).

  Further, in STEPs 7 to 10 in FIG. 6, the control unit 16 confirms the temperature of the evaporator 31, and controls the output of the backlight or stops the cooler 30 as necessary. Control according to temperature is also possible. However, after a predetermined time (for example, 10 minutes) has elapsed after the cooling machine 30 starts driving, the temperature of the condenser 33 is stabilized at a high temperature, and then the control unit 16 confirms the temperature of the condenser 33. Then, it is preferable.

  As mentioned above, although embodiment in this invention was described, the range of this invention is not limited to this, It can add and implement various changes in the range which does not deviate from the main point of invention.

  The present invention is applicable to a display device. In particular, the display device can be used not only indoors but also outdoors.

DESCRIPTION OF SYMBOLS 1 Display apparatus 10 Upper housing | casing 11 Window part 12 Liquid crystal panel 13 Backlight 14 Air blower 15 Housing temperature sensor 16 Control part 17 Housing humidity sensor 20 Lower housing 30 Cooler 31 Evaporator 311T Evaporator temperature sensor 311P Evaporator pressure sensor 32 Compressor 33 Condenser 331T Condenser temperature sensor 331P Condenser pressure sensor 34 Expansion valve

Claims (4)

Compressor cooling including a condenser that condenses the refrigerant by heat dissipation, an evaporator that absorbs heat and dehumidifies by evaporating the refrigerant, and a compressor that sucks the vapor generated from the evaporator and increases the pressure until the vapor condenses. A display device for stopping the compressor when the temperature is equal to or lower than a first predetermined temperature,
A temperature sensor that monitors the temperature of the evaporator;
It has a backlight,
A display device comprising: a controller that increases a backlight level when a temperature of the evaporator becomes equal to or lower than a second predetermined temperature higher than the first predetermined temperature. The display device of claim 1, further comprising:
It has a humidity sensor that measures humidity,
The control unit operates the cooler when the humidity becomes equal to or higher than a predetermined humidity, and in this case, the level of the backlight is increased when the evaporator is equal to or lower than a second predetermined temperature. A cooler including at least a compressor;
A temperature sensor for measuring the temperature;
A humidity sensor that measures humidity;
A controller that operates the compressor when the measured temperature of the temperature sensor is higher than the first temperature, and stops the compressor when the measured temperature is lower than the second temperature lower than the first temperature,
The control unit is an electronic device that further operates the compressor even when the measured temperature is between the first temperature and the second temperature and the measured humidity of the humidity sensor is higher than a predetermined humidity. The electronic device according to claim 3, further comprising:
Display,
An illumination unit that illuminates the display unit;
The control unit increases the output of the illumination unit when the measured temperature is the first temperature or the second temperature.