JP2011055156A - Image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display apparatus capable of cooling a circuit board which controls operations of an image display panel and which is hardly damaged. <P>SOLUTION: The image display apparatus comprises: a first accommodation chamber 5 accommodating the image display panel 2; a second accommodation chamber 6 accommodating a circuit board 22 which controls the operation of the image display panel 2, and a fan equipping a waterproofing filter 73, wherein the fan is arranged at the opening position formed on the rear side of the second accommodation chamber 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  Conventional image display apparatuses are designed on the assumption that most of them are installed indoors (see, for example, Patent Document 1). 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 waterproof 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 in which the circuit board is provided outside the storage chamber, for example, the image display device in which the circuit board is provided on the back side of the back wall forming the storage chamber, the amount of heat generated in the storage chamber is Since the amount of heat generated from the circuit board is reduced, the temperature rise in the accommodation chamber is suppressed. However, in this configuration, since the circuit board is disposed outside the storage chamber having a waterproof 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 first storage chamber that stores an image display panel, a second storage chamber that stores a circuit board that controls the operation of the image display panel, and a waterproof filter. The fan is provided at an opening position formed on the back side of the second storage chamber.

  In the image display device, intrusion of water from the opening is blocked by a filter provided in the fan, and thereby the waterproof structure of the second storage chamber is maintained. And since a circuit board is accommodated in this 2nd accommodation chamber, a circuit board is hard to contact external air. Therefore, even when the image display device is installed outdoors, the circuit board is protected from wind and rain and dust.

  On the other hand, heat generated from the circuit board is likely to accumulate in the second accommodation chamber having the waterproof structure, and thus the temperature in the second accommodation chamber is likely to rise. Here, in the image display device, external air is sucked into the second storage chamber or the air in the second storage chamber is discharged to the outside by the operation of the fan. Heat is dissipated outside the second storage chamber using air as a medium. Therefore, the temperature rise in the second 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 fan includes a first fan and a second fan, the first fan blows air from the outside to the inside of the second storage chamber, and the second fan. This fan blows air from the inside of the second storage chamber to the outside.
According to this specific configuration, air is sucked into the second storage chamber by the first fan, and the sucked air is discharged to the outside by the second fan. Therefore, the heat in the second storage chamber is dissipated outside the second storage chamber using air as a medium.

  In another specific configuration of the image display device, a cover member that covers the fan is attached to a back surface of a back wall that forms the second storage chamber, and the cover member faces the fan. Vent holes are provided at or near the position.

According to the above specific configuration, since the fan is covered with the cover member, even when the image display device is installed outdoors, the waterproof filter provided in the fan is not easily exposed to wind and rain, dust, or the like. Therefore, the filter is hardly deteriorated, and the waterproof performance of the filter is maintained for a long time.
Further, since the cover member is provided with a vent hole, the fan has a function of blowing air, that is, a function of sucking outside air into the second housing chamber or discharging air inside the second housing chamber to the outside. The cover member is not obstructed.

  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 relating to the control of the air blower included in the image display device.

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 waterproof structure and a second housing chamber (6) having a waterproof structure are 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.

  In the storage chamber (5), the liquid crystal display panel (2) has its screen (21) facing the front wall (11) of the housing (1) (front wall (51) forming the storage chamber (5)). Is contained. Thus, the screen (21) from the outside of the casing (1) is visually recognized by the portion of the front wall (11) of the casing (1) facing the screen (21) of the liquid crystal display panel (2). An image display window that makes it possible is configured.

  The second storage chamber (6) is disposed on the back side of the back wall (52) forming the storage chamber (5). Here, the front wall (61) forming the second storage chamber (6) is constituted by the back wall (52) forming the storage chamber (5). The upper surface wall, the lower surface wall, the both side walls, and the back wall forming the second storage chamber (6) are made of metal such as aluminum.

  A pair of upper and lower openings (63) and (64) are formed in the back wall (62) forming the second storage chamber (6), and the first blower (71) is fitted into the upper opening (63). The second blower (72) is fitted into the lower opening (64). The first blower (71) discharges the air in the second storage chamber (6) from the upper opening (63) to the outside, and the second blower (72) removes the outside air from the lower opening. Suction from (64) into the second storage chamber (6). Therefore, as shown by the one-dot chain line arrow in FIG. 2, the air sucked into the second storage chamber (6) from the lower opening (64) passes through the second storage chamber (6) and moves upward. It is discharged to the outside through the opening (63). Therefore, the heat in the second storage chamber (6) is dissipated outside the second storage chamber (6) using air as a medium.

  The first blower (71) and the second blower (72) are provided with waterproof filters (73) and (73), respectively. Accordingly, the intrusion of water from the pair of openings (63) and (64) into which the first and second blowers (71) and (72) are fitted is caused by the first and second blowers (71) and (72). Therefore, the waterproof structure of the second storage chamber (6) is maintained.

  A circuit board (22) for controlling the operation of the liquid crystal display panel (2) is housed in the second housing chamber (6), and the circuit board (22) contains the second housing chamber (6). It is attached to the back surface of the front wall (61) to be formed (the back wall (52) forming the storage chamber (5)).

  A cover member (8) that covers the first and second blower devices (71) and (72) is attached to the back surface of the back wall (62) forming the second storage chamber (6). The cover member (8) is provided with a plurality of air holes (81) to (81) at positions facing the first and second blowers (71) and (72) or in the vicinity thereof.

  Even when the image display device is installed outdoors by covering the first and second blowers (71) and (72) with the cover member (8), the first and second blowers (71) and (72) The provided waterproof filters (73) and (73) are not easily exposed to wind and rain or dust. Therefore, the filters (73) and (73) are not easily deteriorated, and the waterproof performance of the filters (73) and (73) is maintained for a long time.

  Further, by providing a plurality of vent holes (81) to (81) in the cover member (8), the air blowing function of the first air blower (71), that is, the air in the second storage chamber (6) is externally provided. The function of discharging the air is not hindered by the cover member (8), and the air blowing mechanism of the second air blower (72), that is, external air is sucked into the second storage chamber (6). The function is not disturbed by the cover member (8).

The cooling device (4) is a device that recovers heat in the storage chamber (5), and is disposed at a position below the storage chamber (5) and connected to the storage chamber (5). Specifically, the cooling device (4) includes an evaporator that recovers heat in the storage chamber (5), and a condenser that discharges the heat recovered by the evaporator to the outside of the storage chamber (5). In addition, 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.

  As shown in FIG. 3, the image display device further includes a temperature sensor (23) and a control unit (24). A temperature sensor (23) is a sensor which outputs the temperature information which changes according to the temperature in a 2nd storage chamber (6). The controller (24) controls the air blowing operation of the first and second air blowers (71) and (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). The determination means (241) determines whether or not the temperature in the second storage chamber (6) is higher than a predetermined temperature based on the temperature information output from the temperature sensor (23). The air blowing control means (242) is configured to determine the first and second air blowers (71), (72) when the judging means (241) determines that the temperature in the second storage chamber (6) is higher than a predetermined temperature. When the determination means (241) determines that the temperature in the second storage chamber (6) is not higher than a predetermined temperature, the first and second blowers (71) (72) ) To stop the blowing operation.
Here, a temperature lower than the temperature in the second storage chamber (6) when the circuit board (22) starts to be damaged is used as the predetermined temperature that is a criterion for the determination by the determination means (241).

  In the image display device, the liquid crystal display panel (2) is accommodated in the accommodation chamber (5) having a waterproof structure, and the circuit board (22) is accommodated in the second accommodation chamber (6) having the waterproof structure. . Therefore, the liquid crystal display panel (2) and the circuit board (22) are not easily exposed to the outside air. Therefore, even when the image display device is installed outdoors, the liquid crystal display panel (2) and the circuit board (22) are protected from wind and rain, dust, and the like.

  On the other hand, heat generated from the liquid crystal display panel (2) is likely to be accumulated in the storage chamber (5) having a waterproof structure, and thus the temperature in the storage chamber (5) is likely to rise. Here, the image display device is provided with a cooling device (4), and the heat in the storage chamber (5) is recovered by the cooling device (4). Therefore, the temperature rise in the storage chamber (5) is suppressed. 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 maintained in a normal state.

  Further, heat generated from the circuit board (22) is likely to be accumulated in the second accommodation chamber (6) having a waterproof structure, and therefore the temperature in the second accommodation chamber (6) is likely to rise. Here, in the said image display apparatus, when the temperature in a 2nd storage chamber (6) becomes higher than predetermined temperature, the ventilation operation | movement of a 1st and 2nd air blower (71) (72) will be performed, Heat in the second storage chamber (6) is dissipated to the outside of the second storage chamber (6). Therefore, an increase in the temperature in the second storage chamber (6) is suppressed, and the temperature in the second storage chamber (6) is maintained below a predetermined temperature. As a result, damage to the circuit board (22) due to heat is prevented.

  Further, when the temperature in the second storage chamber (6) becomes lower than a predetermined temperature by the air blowing operation of the first and second air blowers (71) and (72), the first and second air blowers (71) and (72) ) Is stopped. Therefore, according to the image display device, the air blowing operation of the first and second air blowers (71) and (72) is continuously executed regardless of the temperature of the second storage chamber (6). Less power consumption than the device.

  In the image display device, the cooling device (4) may be used for both cooling the liquid crystal display panel (2) and the circuit board (22). For example, a configuration in which the circuit board (22) in the second storage chamber (6) is cooled from below the second storage chamber (6) using the cooling device (4) is conceivable. Further, a configuration in which the circuit board (22) is disposed in the accommodation chamber (5) in order to cool the circuit board (22) by the cooling device (4) is conceivable.

  However, when an LED is used instead of a lamp (for example, a CCFL or an ultrahigh pressure mercury lamp) as a light source for image display of the liquid crystal display panel (2) as in the image display device, the cooling device (4). Therefore, it is necessary to cool not only the liquid crystal shutter and the polarizing plate of the liquid crystal display panel (2) but also the LED as the light source. Therefore, the image display device employs a configuration in which only the liquid crystal display panel (2) is cooled by the cooling device (4), and the circuit board (22) is cooled by cooling means different from the cooling device (4). Yes.

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.
In the above embodiment, the front wall (61) forming the second storage chamber (6) is constituted by the back wall (52) forming the storage chamber (5), but the present invention is not limited to this. It is not something that can be done. The front wall (61) that forms the second storage chamber (6) may be constituted by a wall surface constituent member that is different from the back wall (52) that forms the storage chamber (5). In this case, the front wall (61) forming the second storage chamber (6) may be arranged away from the back wall (52) forming the storage chamber (5) on the back side.

  In the said embodiment, both the 1st and 2nd ventilation apparatus (71) (72) may discharge | emit the air in a 2nd storage chamber (6) outside. Alternatively, both the first and second air blowers (71) and (72) may suck outside air into the second storage chamber (6).

  Moreover, in the said embodiment, although the number of the air blowers provided in the back wall (62) which forms the 2nd storage chamber (6) is two, this invention is not limited to this. . The number of blowers provided on the back wall (62) may be one, or a plurality other than two.

  In the above embodiment, the filters (73) and (73) included in the first and second air blowers (71) and (72) are waterproof, but may be further dustproof.

  Moreover, in the said embodiment, the cover member (8) which covers the 1st and 2nd ventilation apparatus (71) (72) is attached to the back surface of the back wall (62) which forms the 2nd storage chamber (6). It has been. However, if the filters (73) (73) provided in the first and second air blowers (71) (72) are difficult to be exposed to wind and rain or dust without the cover member (8), the above image display is performed. The apparatus may be configured without the cover member (8).

  Furthermore, 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. The light source may be a lamp other than the LED.

(1) Case
(2) Liquid crystal display panel (image display panel)
(21) Screen
(22) Circuit board
(5) Containment room
(51) Front wall forming the containment chamber
(52) Back wall forming the containment chamber
(6) Second containment chamber
(61) Front wall forming second storage chamber
(62) Back wall forming second storage chamber
(63) Upper opening
(64) Lower opening
(71) First blower (first fan)
(72) Second blower (second fan)
(73) Filter
(8) Cover member
(81) Vent

Claims (3)

A first storage chamber for storing an image display panel;
A second storage chamber for storing a circuit board for controlling the operation of the image display panel;
With a fan with a waterproof filter,
The fan is an image display device provided at an opening position formed on the back side of the second storage chamber. The fan includes a first blower and a second blower,
The first blower blows air from the outside to the inside of the second storage chamber,
The second blower blows air from the inside of the second storage chamber to the outside.
The image display device according to claim 1.   A cover member that covers the fan is attached to the back surface of the back wall that forms the second storage chamber, and the cover member has a vent hole at a position facing the fan or in the vicinity thereof. The image display device according to claim 1 or 2.

Images