JP5415207B2 - Image display device - Google Patents

Description

  The present invention relates to an image display device including an image display panel.

  Most conventional image display devices are designed on the assumption that they are installed indoors (see, for example, Patent Document 1). The image display device includes an image display unit such as an image display panel and an image display. No measures have been taken to protect circuit boards or the like that control the operation of the unit from wind and rain or dust. For this reason, it has been difficult to permanently install a conventional image display device outdoors.

  In recent years, it has been desired that an image display device including a flat image display panel be permanently installed outdoors. The reason is that the image display device has a small thickness. When the thickness dimension is small, the image display device can be installed in a narrow place.

JP 2005-286987 A

  In order to allow the image display device to be installed outdoors, it is conceivable that a housing chamber having a sealed structure is formed inside the housing, and the image display panel and the circuit board are housed in the housing chamber.

  However, when the image display panel and the circuit board are accommodated in the same accommodation chamber, the temperature in the accommodation chamber is likely to rise due to heat generated from the image display panel and the circuit board. For this reason, the temperature of the image display panel rises and the function of the image display panel decreases, and as a result, there is a possibility that the image display becomes impossible. Further, the temperature of the circuit board rises and the circuit board may be damaged.

  On the other hand, according to the image display device provided with the cooling means for cooling the air in the accommodation chamber, the temperature rise in the accommodation chamber is suppressed. However, in the image display apparatus in which the image display panel and the circuit board are accommodated in the same accommodation chamber, the circuit board is disposed in the vicinity of the image display panel. For this reason, the heat generated from the image display panel is easily transferred to the circuit board, and therefore the temperature of the circuit board rises and the circuit board is damaged although the air in the accommodation chamber is cooled by the cooling means. There is a fear.

  On the other hand, according to an image display device in which a circuit board is provided outside the storage chamber, for example, an image display device in which a circuit board is provided on the back side of the back wall forming the storage chamber, heat generated from the image display panel is applied to the circuit board. It becomes difficult to be transmitted. However, in this configuration, since the circuit board is disposed outside the accommodating chamber having a sealed structure, when the image display device is permanently installed outdoors, the circuit board is exposed to wind and rain, dust, etc., and the circuit board is damaged. There is a fear.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an image display device that can cool a circuit board that controls the operation of an image display panel and that the circuit board is not easily damaged.

An image display device according to the present invention includes a storage chamber having a sealed structure and a cooling means for cooling air in the storage chamber. The storage chamber controls an image display panel and an operation of the image display panel. An image display window facing the screen of the image display panel is provided on the front wall forming the storage chamber.
Here, the storage chamber is partitioned by a plate member into a front side region along the front wall forming the storage chamber and a back side region along the back wall forming the storage chamber, and the front side of the storage chamber While the image display panel is provided in the area, the circuit board is provided in the rear side area of the storage chamber. The cooling means cools the air in the front side region of the storage chamber, and the plate member has a pair of openings, and one of the pair of openings, the inside of one opening, or the one opening. A first air blower is disposed in the vicinity, and a second air blower is disposed in the other opening or in the vicinity of the other opening. The first air blower The one opening is passed from the front side region to the back side region, and the second blower device passes the air in the accommodation chamber from the back side region to the front side region through the other opening.

  In the above image display device, since the image display panel and the circuit board are accommodated in the housing chamber having a sealed structure, the image display panel and the circuit board are protected from wind and rain even when the image display device is installed outdoors. It will be protected from etc.

  In the image display device, the storage chamber is partitioned by a plate member into a front side region where the image display panel is provided and a back side region where the circuit board is provided. A plate member is interposed between the circuit board and the circuit board. Therefore, heat generated from the image display panel is difficult to be transferred to the circuit board.

  On the other hand, heat generated from the image display panel easily accumulates in the front side region of the storage chamber, and heat generated from the circuit board easily accumulates in the rear side region of the storage chamber. For this reason, the temperature in the front side area | region and back side area | region of a storage chamber tends to rise. Here, the air in the front side region of the storage chamber is cooled by the cooling means. Therefore, the temperature rise in the front side region of the storage chamber is suppressed, and as a result, the temperature rise of the image display panel is suppressed and the function of the image display panel is maintained in a normal state.

  In the image display device, by operating the first blower, a part of the air in the front side region of the storage chamber flows through one opening and flows into the back side region of the storage chamber. Further, by operating the second air blower, the air that has flowed from one opening to the back side region of the storage chamber passes through the back side region and returns from the other opening to the front side region of the storage chamber. Become. Here, since the air in the front side region of the storage chamber is cooled by the cooling unit, a part of the air cooled by the cooling unit passes through the back side region of the storage chamber. Therefore, the temperature rise in the back side region of the storage chamber is suppressed, and as a result, damage to the circuit board due to heat is prevented.

  In the specific configuration of the image display device, the plate member is pivotally supported by a first lid member that opens and closes the one opening, and is pivotally supported by a second lid member that opens and closes the other opening. The first lid member receives wind pressure from the first blower device and opens to the inside of the rear side region of the storage chamber, and the second lid member receives wind pressure from the second blower device and receives the wind pressure. Open inside the front area of the room.

According to the specific configuration, when the first blower and the second blower are operating, the first lid member and the second lid member are opened, and the pair of openings are exposed. Therefore, the movement of air between the front side region and the back side region of the storage chamber is not hindered by the both lid members.
On the other hand, when the operations of the first blower and the second blower are stopped, the first lid member and the second lid member are closed, and the pair of openings are closed. Accordingly, the movement of air between the front side region and the back side region of the storage chamber is prevented by the two lid members. Therefore, the air in the front side region of the storage chamber is efficiently cooled by the cooling means, and as a result, the temperature of the image display panel is likely to decrease.

In another specific configuration of the image display device, the image display device controls a temperature sensor that detects a temperature in a rear side region of the storage chamber, and a blowing operation of the first blower and the second blower. The temperature sensor outputs temperature information that changes according to the detected temperature, and the control means outputs the temperature information output from the temperature sensor based on the temperature information output from the first air blower. The air blowing operation of the second air blower is controlled.
According to this specific configuration, it is possible to adjust the temperature in the rear side region of the storage chamber by the control means. Therefore, it is possible to prevent the circuit board from being damaged by heat by suppressing the temperature rise in the rear side region of the storage chamber.

In a more specific configuration, the control means includes a determination means and a ventilation control means. The determination means determines whether or not the temperature in the rear side region of the storage chamber is higher than a predetermined temperature based on the temperature information output from the temperature sensor. The air blowing control unit causes the first air blowing device and the second air blowing device to perform an air blowing operation when the determination unit determines that the temperature in the rear side region of the storage chamber is higher than a predetermined temperature, and performs the determination. When the means determines that the temperature in the rear side region of the storage chamber is not higher than a predetermined temperature, the first air blower and the second air blower are stopped.
The predetermined temperature is preferably set to a temperature lower than the temperature in the rear side region of the storage chamber when the circuit board starts to be damaged by overheating.

According to the specific configuration, when the temperature in the rear side region of the storage chamber becomes higher than the predetermined temperature, the air blowing operation of the first blower and the second blower is performed, and the temperature rise in the rear side region is increased. Will be suppressed.
On the other hand, when the temperature in the back side region of the storage chamber becomes lower than a predetermined temperature by the blowing operation of the first blowing device and the second blowing device, the blowing operation of the first blowing device and the second blowing device is stopped. Therefore, according to the said image display apparatus, compared with the image display apparatus with which the ventilation operation | movement of a 1st air blower and a 2nd air blower is performed continuously irrespective of the temperature level in a back side area, power consumption is compared. Less is enough.

  The image display device according to the present invention can cool the circuit board that controls the operation of the image display panel, and the circuit board is hardly damaged.

FIG. 1 is a perspective view of an image display device according to an embodiment of the present invention as viewed from the front side. FIG. 2 is a vertical sectional view of the image display device. FIG. 3 is a block diagram showing a configuration related to the control of the blower for the image display device. FIG. 4 is a vertical sectional view showing a modification of the image display device. FIG. 5 is a vertical cross-sectional view for explaining the operation of the air blower and the lid member included in the image display device according to the modified example.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
As shown in FIG. 1, an image display apparatus according to an embodiment of the present invention includes a housing (1), a liquid crystal display panel (2) disposed in the housing (1), and a housing (1 ) And a cooling device (4). The liquid crystal display panel (2) has a light emitting diode (LED) as a light source for image display.

  As shown in FIG. 2, a housing chamber (5) having a sealed structure is formed inside the housing (1). The front wall (51) forming the housing chamber (5) is constituted by a front wall (11) constituting the housing (1), and the front wall (11) is made of a light-transmitting material, for example, It is formed from a glass material. On the other hand, the upper wall, the lower wall, the both side walls, and the back wall forming the storage chamber (5) are made of metal such as aluminum.

  The storage chamber (5) includes a plate member (6), a front side region (53) along the front wall (51) forming the storage chamber (5), and a back wall (52) forming the storage chamber (5). And is divided into a rear side region (54). A pair of upper and lower openings (61) and (62) are formed in the plate member (6).

  The liquid crystal display panel (2) is accommodated in the front side region (53) of the accommodation chamber (5), and the screen (21) of the liquid crystal display panel (2) is the front surface forming the accommodation chamber (5). It is directed to the wall (51) (the front wall (11) of the housing (1)). Thus, as shown in FIG. 2, the screen (21) of the liquid crystal display panel (2) out of the front wall (51) (the front wall (11) of the housing (1)) forming the accommodation chamber (5). ) Constitutes an image display window (10), through which the screen (21) of the liquid crystal display panel (2) can be viewed from the outside of the housing (1). It has become.

  A circulation channel (50) that passes through the front side and the back side of the liquid crystal display panel (2) and surrounds the liquid crystal display panel (2) is provided in the front side region (53) of the storage chamber (5). Is formed. Specifically, the circulation flow path (50) includes a first flow path portion (501) passing between the screen (21) of the liquid crystal display panel (2) and the image display window (10), and a liquid crystal display panel. A second channel portion (502) passing between the back surface (25) of (2) and the plate member (6), the first channel portion (501) and the second channel portion (502). The upper end portions thereof communicate with each other, and the lower end portions thereof communicate with each other via the cooling device (4) at a position below the storage chamber (5).

  The front side region (53) of the storage chamber (5) further contains a blower device (70), and the blower device (70) is located at a position on the back side of the liquid crystal display panel (2). The intake side is directed upward and the exhaust side thereof is directed downward. Therefore, when the air blower (70) is operated, as indicated by a one-dot chain line arrow in FIG. 2, air in the second flow path portion (502) of the circulation flow path (50) (the liquid crystal display panel (2) The air on the back side flows downward along the back surface of the liquid crystal display panel (2), then passes through the cooling device (4) and flows into the first flow path portion (501) from below. Accordingly, the air in the first flow path portion (501) of the circulation flow path (50) (air on the front side of the liquid crystal display panel (2)) flows upward along the front surface of the liquid crystal display panel (2), Thereafter, it passes through the upper surface side of the liquid crystal display panel (2) and flows into the second flow path portion (502) from above. Thus, by operating the air blower (70), the air in the front side region (53) of the storage chamber (5) circulates along the circulation channel (50).

  A circuit board (22) for controlling the operation of the liquid crystal display panel (2) is accommodated in the rear side area (54) of the accommodation chamber (5). The circuit board (22) is composed of a plate member (6). Is attached to a region between a region where a pair of upper and lower openings (61) and (62) are formed.

  Of the pair of upper and lower openings (61) and (62), a first blower (71) is provided inside the upper opening (61), and a second blower ( 72) is deployed. Here, as for the 1st air blower (71), the inhalation | air_intake side is orient | assigned to the front side area | region (53) of a storage chamber (5), and the exhaust side is orient | assigned to the back side area | region (54) of a storage chamber (5). Yes. The second air blower (72) has its intake side directed to the rear side region (54) of the storage chamber (5) and its exhaust side directed to the front side region (53) of the storage chamber (5).

  Accordingly, when the first blower (71) is operated, the air in the front side region (53) of the storage chamber (5) passes through the upper opening (61) and moves to the back side region (54). Will do. On the other hand, when the second air blower (72) is operated, the air in the rear side region (54) of the storage chamber (5) passes through the lower opening (62) to the front side region (53). Will move.

Although not shown, the cooling device (4) includes an evaporator that recovers heat in the circulation channel (50), and a condenser that exhausts the heat recovered by the evaporator to the outside of the circulation channel (50). The evaporator and the condenser are connected to each other by a pipe through which the refrigerant flows. The cooling device (4) includes a compressor that compresses the refrigerant flowing from the evaporator to the condenser. Therefore, a high-temperature and high-pressure refrigerant flows into the condenser. Therefore, the heat recovered by the evaporator is efficiently discharged by the condenser.
Accordingly, the air circulating in the circulation flow path (50) is cooled by the cooling device (4), whereby the air in the front side region (53) of the storage chamber (5) is cooled.

  As shown in FIG. 3, the image display device further includes a temperature sensor (23) for detecting the temperature in the rear side region (54) of the storage chamber (5), a first blower (71), and a second blower. And a controller (24) for controlling the air blowing operation of the device (72). A temperature sensor (23) outputs the temperature information which changes according to detection temperature by detecting the temperature in the back side area | region (54) of a storage chamber (5). The control unit (24) controls the air blowing operation of the first air blower (71) and the second air blower (72) based on the temperature information output from the temperature sensor (23).

The control unit (24) includes a determination unit (241) and a ventilation control unit (242). Based on the temperature information output from the temperature sensor (23), the determination means (241) determines whether or not the temperature in the rear side region (54) of the storage chamber (5) is higher than a predetermined temperature. When the judgment means (241) determines that the temperature in the rear side region (54) of the storage chamber (5) is higher than a predetermined temperature, the air blow control means (242) is connected to the first blower (71) and the first blower (71). 2 When the air blower (72) is caused to perform the air blowing operation, when the determination means (241) determines that the temperature in the rear side region (54) of the storage chamber (5) is not higher than the predetermined temperature, the first The air blowing operation is stopped by the air blower (71) and the second air blower (72).
Here, the predetermined temperature, which is a criterion for determination by the determination means (241), is lower than the temperature in the rear side region (54) of the storage chamber (5) when the circuit board (22) starts to be damaged by overheating. The temperature is set.

  In the image display device, since the liquid crystal display panel (2) and the circuit board (22) are accommodated in the accommodating chamber (5) having a sealed structure, the liquid crystal display panel can be used even when the image display device is installed outdoors. The display panel (2) and the circuit board (22) are protected from wind and rain and dust.

  In the image display device, the storage chamber (5) is provided with a plate member (6), a front side region (53) where the liquid crystal display panel (2) is provided, and a circuit board (22). And is divided into a rear side region (54). Accordingly, the plate member (6) is interposed between the liquid crystal display panel (2) and the circuit board (22). Therefore, the heat generated from the liquid crystal display panel (2) is difficult to be transmitted to the circuit board (22).

  On the other hand, heat generated from the liquid crystal display panel (2) easily accumulates in the front side region (53) of the storage chamber (5), and a circuit board (in the back side region (54) of the storage chamber (5)). Heat generated from 22) tends to accumulate. For this reason, the temperature in the front side region (53) and the back side region (54) of the storage chamber (5) is likely to rise. Here, the air in the front side region (53) of the storage chamber (5) is cooled by the cooling device (4). Therefore, the temperature rise in the front side region (53) of the storage chamber (5) is suppressed, and as a result, the temperature rise of the liquid crystal display panel (2) is suppressed, and the function of the liquid crystal display panel (2) is normal. Maintained in a state.

  Moreover, not only the heat generated from the back side of the liquid crystal display panel (2) but also the heat generated from the front side of the liquid crystal display panel (2) is recovered by the air circulating in the circulation channel (50). . Therefore, the liquid crystal display panel (2) is efficiently cooled.

In the image display device, when the temperature in the rear side region (54) of the storage chamber (5) becomes higher than a predetermined temperature, the air blowing operation of the first air blowing device (71) and the second air blowing device (72) is executed. Is done. As a result, as indicated by a two-dot chain line arrow in FIG. 2, a part of the air flowing on the back side of the liquid crystal display panel (2) passes through the upper opening (61) and the back side of the storage chamber (5). The air that flows into the region (54) and flows into the back side region (54) passes through the back side region (54) and passes through the lower side opening (62) to the front side region (53) of the storage chamber (5). ) Will return.
Here, since the air in the front side region (53) of the storage chamber (5) is cooled by the cooling device (4), part of the air cooled by the cooling device (4) is stored in the storage chamber (5). It passes through the back side region (54) of the. As a result, the temperature rise in the back side region (54) of the storage chamber (5) is suppressed, and damage to the circuit board (22) due to heat is prevented.

  Furthermore, when the temperature in the back side region (54) of the storage chamber (5) becomes lower than a predetermined temperature by the air blowing operation of the first air blower (71) and the second air blower (72), the first air blower (71 ) And the second air blower 72 are stopped. Therefore, compared with the image display apparatus in which the air blowing operation of the first air blower (71) and the second air blower (72) is continuously performed regardless of the temperature in the rear side region (54), the power consumption. Is less.

  In the above embodiment, the air blower (70) is arranged with its intake side facing upward, but the present invention is not limited to this. The air blower (70) may be arranged with its intake side facing downward. When the intake side of the blower (70) is directed downward, the air in the second flow path portion (502) of the circulation flow path (50) (air on the back side of the liquid crystal display panel (2)) flows upward, As a result, air in the first flow path portion (501) of the circulation flow path (50) (air on the front side of the liquid crystal display panel (2)) flows downward.

  The first flow path part (501) and the second flow path part (502) of the circulation flow path (50) may have their side ends communicating with each other. In this configuration, the air blower (70) is arranged with its intake side facing sideways.

In the above-described embodiment, the pair of openings (61) and (62) are arranged vertically, but the present invention is not limited to this. For example, the pair of openings (61) (62) may be arranged side by side.
Moreover, in the said embodiment, a pair of opening (61) (62) may be provided in the plate member (6) in multiple places.

  FIG. 4 is a vertical sectional view showing a modification of the image display device. As shown in FIG. 4, in the image display device according to this modification, the first blower device (71) is located in the vicinity of the upper opening (61) in the front side region (53) of the storage chamber (5). The second air blower (72) is deployed in the vicinity of the lower opening (62) in the rear side region (54) of the storage chamber (5). Here, the first blower (71) is arranged with its exhaust side facing the upper opening (61), and the second blower (72) has its exhaust side facing the lower opening (62). Are arranged.

  A first lid member (81) for opening and closing the upper opening (61) is pivotally supported on the plate member (6), and a second lid member (82) for opening and closing the lower opening (62). Is pivotally supported. Here, the 1st cover member (81) is attached to the board member (6) so that it can open to the inner side of the back side area | region (54) of a storage chamber (5). The second lid member (82) is attached to the plate member (6) so as to be able to open to the inside of the front side region (53) of the storage chamber (5).

  Accordingly, when the first blower (71) operates, as shown in FIG. 5, the first lid member (81) receives the wind pressure from the first blower (71) and receives the air pressure in the storage chamber (5). It opens to the inside of the back side region (54). On the other hand, when the second air blower (72) is operated, the second lid member (82) receives the wind pressure from the second air blower (72) as shown in FIG. It opens to the inside of the front side region (53).

  According to the image display device according to the modified example, the temperature in the rear side region (54) of the storage chamber (5) becomes higher than a predetermined temperature, and the first blower device (71) and the second blower device (72). As shown in FIG. 5, the first lid member (81) and the second lid member (82) are opened, and the pair of openings (61) and (62) are exposed. Become.

  Therefore, as shown by a two-dot chain line arrow in FIG. 5, a part of the air flowing on the back side of the liquid crystal display panel (2) passes through the upper opening (61) and the rear side region of the storage chamber (5). The air that has flowed into (54) passes through the rear side region (54) and returns from the lower opening (62) to the front side region (53) of the storage chamber (5). Therefore, a part of the air cooled by the cooling device (4) passes through the rear side region (54) of the storage chamber (5). As a result, the temperature rise in the back side region (54) is suppressed, and damage to the circuit board (22) due to heat is prevented.

  On the other hand, when the temperature in the back side region (54) of the storage chamber (5) becomes lower than a predetermined temperature and the blowing operation of the first blowing device (71) and the second blowing device (72) is stopped, As shown in FIG. 4, the first lid member 81 and the second lid member 82 are closed, and the pair of openings 61 and 62 are closed. Therefore, the movement of air between the front side region (53) and the back side region (54) of the storage chamber (5) is prevented by the two lid members (81) (82). Therefore, the air in the front side region (54) of the storage chamber (5) is efficiently cooled by the cooling device (4), and as a result, the temperature of the liquid crystal display panel (2) is likely to decrease. .

  In addition, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim. For example, the various configurations employed in the image display device are not limited to the image display device including the liquid crystal display panel (2), but include various image display panels such as a plasma display panel and an organic EL (Electro-Luminescence) display panel. It can be applied to the provided image display device.

(1) Case
(10) Image display window
(2) Liquid crystal display panel (image display panel)
(21) Screen
(22) Circuit board
(23) Temperature sensor
(24) Control unit (control means)
(241) Judgment means
(242) Air flow control means
(4) Cooling device (cooling means)
(5) Containment room
(50) Circulation channel
(51) Front wall forming the containment chamber
(52) Back wall forming the containment chamber
(53) Front side area
(54) Rear side area
(6) Plate member
(61) Upper opening
(62) Lower opening
(70) Blower (blower means)
(71) First blower
(72) Second blower
(81) First lid member
(82) Second lid member

Claims (3)

A storage chamber having a sealed structure; and cooling means for cooling air in the storage chamber. The storage chamber stores an image display panel and a circuit board for controlling the operation of the image display panel. In the image display device in which an image display window facing the screen of the image display panel is provided on the front wall forming the storage chamber,
The storage chamber is partitioned by a plate member into a front side region along the front wall forming the storage chamber and a back side region along the back wall forming the storage chamber. While the image display panel is provided, the circuit board is provided in the back side region of the storage chamber, the cooling means cools the air in the front side region of the storage chamber, and the plate member has a pair of An opening is formed, and the first air blower is disposed inside the one opening or in the vicinity of the one opening of the pair of openings, and inside the other opening or in the vicinity of the other opening. A second air blower is provided, the first air blower allows the air in the accommodation chamber to pass through the one opening from the front side region to the back side region, and the second air blower is disposed in the accommodation chamber. Air is passed through the other opening from the rear side region to the front side region. It is those that cause,
A first lid member that opens and closes the one opening is pivotally supported by the plate member, and a second lid member that opens and closes the other opening is pivotally supported, and the first lid member is the first lid member. Receives wind pressure from the blower and opens to the inside of the rear side region of the storage chamber, and the second lid member opens to the inside of the front side of the storage chamber by receiving the wind pressure from the second blower. And
The apparatus further includes a temperature sensor that detects a temperature in a rear side region of the storage chamber, and a control unit that controls the air blowing operation of the first air blower and the second air blower, and the temperature sensor corresponds to the detected temperature. The temperature information which changes is output, The said control means controls the ventilation operation | movement of a said 1st air blower and a 2nd air blower based on the temperature information output from the said temperature sensor, The image display apparatus characterized by the above-mentioned . The control means includes
Determination means for determining whether the temperature in the rear side region of the storage chamber is higher than a predetermined temperature based on temperature information output from the temperature sensor;
When it is determined by the determination means that the temperature in the rear side region of the storage chamber is higher than a predetermined temperature, the first blower and the second blower are caused to perform a blowing operation, and the determination chamber causes the storage chamber to 2. The image display according to claim 1 , further comprising: a blower control unit that causes the first blower and the second blower to stop the blowing operation when it is determined that the temperature in the rear side region of the first fan is not higher than a predetermined temperature. apparatus. The image display device according to claim 2 , wherein the predetermined temperature is set to a temperature lower than a temperature in a rear side region of the storage chamber when the circuit board starts to be damaged by overheating.

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