JP2012215675A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress a temperature rise in a housing, in an image display device in which a front surface opening portion of a housing 8 is blocked by a light permeable protection panel and an indicator 2 is stored inside of the housing 8 so as to face the protection panel.SOLUTION: An image display device comprises a front surface space 11 formed between a protection panel and an indicator 2; circulating channels 3, 4, 7, and 7, formed so as to surround the front surface space 11; one or a plurality of fans 71 and 72 installed in the circulating channels 7 and 7; and a partition wall interposed between the circulating channel extending above or below the front surface space 11 and the front surface space 11. On the partition wall, a plurality of ventilation holes 83 is opened so as to scatter in a width direction of the indicator 2.

Description

  The present invention relates to an image display device having a sealed structure.

  In a conventional image display device installed outdoors or in an environment equivalent to the outdoors, for example, as shown in FIG. 2, a liquid crystal display (9) having an image display surface (90) is provided inside a housing (92). The housing (92) is closed with a transparent glass protective panel (91) to close the housing space of the liquid crystal display (9), thereby ensuring waterproofness and dustproofness. Has been done.

  In addition, it has been proposed that a waterproof sheet, a gasket, or the like be interposed between the front surface opening of the housing (92) and the protective panel (91) to improve waterproofness (Patent Document 1). .

JP 2005-309268 A

However, in the image display device having the sealed structure as described above, the heat generated from the liquid crystal display (9) may be trapped inside the housing (92), causing a malfunction due to the temperature rise of the electronic component.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to effectively suppress an increase in temperature inside a housing in an image display device having a sealed structure.

In the image display device according to the present invention, the opening of the casing (8) is closed by the light-transmitting protective panel (1), and the protective panel (1) is provided inside the casing (8). Facing the display (2) is housed,
A front space (11) formed between the protective panel (1) and the indicator (2);
A circulation channel (3) (4) (7) (7) formed surrounding the front space (11);
One or more fans installed in the circulation channel (3) (4) (7) (7);
A plurality of vent holes (83) are provided in a distributed manner in the width direction of the display (2), interposed between a circulation channel extending above or below the front space (11) and the front space (11). Bulkhead (85)
And has.

In the image display device of the present invention, when the fan rotates, air is sent into the front space (11) from the circulation flow path (3) through the plurality of vent holes (83), and the front space (11). The air that has passed through flows into the circulation channel (4), flows through the circulation channels (7) and (7), and then flows into the front space (11) from the circulation channel (3) again. .
At this time, air is blown out from the plurality of vent holes (83) toward the front space (11) of the display (2), whereby the width of the display (2) is increased in the front space (11). As a result, an air flow that is dispersed and uniformly flows is generated, so that the surface of the display (2) is efficiently cooled by this air flow.

In a specific embodiment, the circulation channels (3) and (4) are adjacent to the open channels (5) and (6) opened to the outside air through the heat exchange wall (87).
Accordingly, the air flowing through the circulation flow paths (3), (4), (7), and (7) and the air in the open flow paths (5) and (6) exchange heat with each other via the heat exchange wall (87). The temperature rise of the air flowing through the flow paths (3), (4), (7) and (7) is suppressed.

Further, in a specific embodiment, the circulation channels (3), (4), (7), and (7) include an upper circulation channel (3) extending above the front space (11) in the width direction of the display (2). And a lower circulation channel (4) extending in the width direction of the display (2) below the front space (11), and a partition wall between the upper circulation channel (3) and the front space (11) ( A plurality of ventilation holes (83) are formed in 85), and a plurality of ventilation holes (83) are formed in the partition wall (85) between the lower circulation channel (4) and the front space (11).
The intake fans (71) and (71) are installed on both sides of one of the upper circulation channel (3) and the lower circulation channel (4), and the other channel (4 Exhaust fans (72) and (72) are installed on both sides of).

  According to the specific embodiment described above, the intake fans (71) (71) and the exhaust fans (72) (72) rotate, so that the air in the one flow path (3) is made into a plurality of vent holes (83). ) Through the front space (11) and flow through the front space (11) flows into the other channel (4) through the plurality of vent holes (83). The air flowing into the flow path (4) returns to the one flow path (3) again through the circulation flow paths (7) and (7).

  According to the image display device of the present invention, since the surface of the display device is efficiently cooled, the temperature rise inside the housing can be effectively suppressed.

FIG. 1 is a perspective view showing an appearance of an image display apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a schematic configuration of a conventional image display apparatus. FIG. 3 is a diagram for explaining a circulation channel formed in the image display apparatus according to the embodiment of the present invention. FIG. 4 is a cross-sectional view showing the main part of the image display device. FIG. 5 is a cross-sectional view at a position different from FIG. FIG. 6 is a partially broken perspective view of the bezel.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
As shown in FIG. 1, an image display device according to an embodiment of the present invention includes a casing (8) in which a synthetic resin bezel (81) and a back cabinet (82) are joined and fixed to each other. A protective panel (1), which will be described later, is exposed from the front opening of the housing (8), and an image can be viewed through the protective panel (1).

  As shown in FIG. 4, a liquid crystal display (2) having an image display surface (20) is housed in the housing (8), and the front opening of the housing (8) is made of transparent tempered glass. It is blocked by a protective panel (2). Thus, the housing (8) has a sealed structure.

  As shown in FIG. 3, an upper circulation channel (3) extending in the width direction of the liquid crystal display (2) is provided above the front space (11) of the liquid crystal display (2). And a lower circulation channel (4) extending in the width direction of the liquid crystal display (2) is formed below the front space (11) (see FIGS. 4 to 6).

  The upper circulation channel (3) and the lower circulation channel (4) are connected to each other by two side circulation channels (7) and (7) formed on the left and right sides of the liquid crystal display (2). A loop-shaped closed circulation channel (3) (4) (7) (7) surrounding the front space (11) is formed.

  The side circulation passages (7) and (7) are provided with intake fans (71) and (71) facing both ends of the upper circulation passage (3), and the lower circulation passage (4). Exhaust fans (72) and (72) are installed to face both end portions.

  As shown in FIGS. 4 to 6, the bezel (81) includes a partition wall (85) that partitions the front space (11) and the lower circulation channel (4), and a plurality of vent holes (along the front space (11)). 83) has been established. In addition, a plurality of vent holes (83) are also opened along the front space (11) in the partition wall (85) that partitions the front space (11) and the upper open flow path (5) (see FIG. 3). .

  Also, as shown in FIG. 3, an upper open flow path (5) extending along the upper circulation flow path (3) is formed above the upper circulation flow path (3), and the lower circulation flow path (4) A lower open channel (6) extending along the lower circulation channel (4) is formed below.

As shown in FIGS. 4 to 6, the lower circulation channel (4) and the lower open channel (6) are adjacent to each other via the heat exchange wall (87). Similarly, the upper circulation channel (3) and the upper open channel (5) are adjacent to each other via the heat exchange wall (87).
The heat exchange wall (87) is formed in a corrugated plate shape on both sides in order to increase the surface area.

  As shown in FIG. 5, the partition wall (86) facing the lower open flow path (6) is provided with a plurality of vent holes (84) along the lower open flow path (6). ) Is connected to the open air. Similarly, a plurality of vent holes (84) are also opened along the lower open channel (6) in the partition wall (86) facing the upper open channel (5), and these vent holes (84) are open to the outside air. It is connected with.

As shown in FIG. 3, when the intake fans (71) (71) and the exhaust fans (72) (72) rotate, the air sent into the upper circulation channel (3) by the intake fans (71) (71). However, the air that has been ejected from the plurality of vent holes (83) toward the front space (11) and passed through the front space (11) flows into the lower circulation channel (4) from the plurality of vent holes (83). The air in the lower circulation channel (4) is sucked into the side circulation channels (7) and (7) by the exhaust fans (72) and (72).
As a result, air circulation indicated by arrows in FIG. 3 occurs.

  In the housing (8), the liquid crystal display (2) is the largest heat source, and particularly a large amount of heat is emitted from the front surface of the liquid crystal display (2). In the image display device according to the present invention, As shown in FIG. 3, air is ejected vigorously from the plurality of air holes (83) toward the front space (11) of the liquid crystal display (2). As a result, a high-speed air flow is generated in the front space (11) that is dispersed and uniformly distributed in the width direction of the display (2), so that the surface of the liquid crystal display (2) is high due to this air flow. It is efficiently cooled with the heat transfer coefficient.

The temperature of the air circulating through the circulation channels (3), (4), (7), and (7) rises due to the heat generated from the liquid crystal display (2), but as shown by the arrows in FIG. The air flowing in the channel (4) and the air in the lower open channel (6) exchange heat with each other through the heat exchange wall (87), and the circulation channels (3) (4) (7) (7) The temperature rise of the air circulating through is suppressed.
Since the air in the lower open flow path (6) communicates with the outside air through the vent hole (84), the air in the lower open flow path (6) is replaced by the exchange of the air in the lower open flow path (6). The heat of the air is dissipated to the outside.

Similarly, the air flowing through the upper circulation channel (3) and the air in the upper open channel (5) exchange heat with each other via the heat exchange wall (87), and the circulation channels (3) and (4). (7) The temperature rise of the air circulating through (7) is suppressed.
Since the air in the upper open flow path (5) communicates with the outside air through the vent hole (84), the air in the upper open flow path (5) is replaced by the air in the upper open flow path (5). The heat of the air is dissipated to the outside.

  In addition, a fan is installed in the upper open flow path (5) and the lower open flow path (6) as necessary, and the air flows in the upper open flow path (5) and the lower open flow path (6). By providing, the efficiency of heat exchange through the heat exchange wall (87) can be increased.

  According to the above image display device, the surface of the liquid crystal display (2) is efficiently caused by the uniform air flow flowing through the front flow space (11) through the circulation channels (3), (4), (7) and (7). As a result, the temperature rise of the electronic components inside the housing (8) is effectively suppressed.

In particular, in the image display device, two intake fans (71) (71) are installed on both sides of the upper circulation channel (3), and the upper circulation channel (3) is connected to both the intake fans (71) (71). ), The air pressure in the upper circulation channel (3) is sufficiently high, and a sufficient amount of airflow is ejected from the plurality of vent holes (83).
As a result, a high cooling effect can be obtained.

  When an image display device is installed in a public facility or the like, the installation space is often limited. In such a case, it is difficult to install a large fan as a fan for cooling a liquid crystal display or the like. However, according to the configuration of the present invention, the air flow rate is sufficient even for a small fan. High cooling effect can be obtained.

  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 intake fan (71) and the exhaust fan (72) shown in FIG. 3 can be installed with the vertical positional relationship reversed. As a result, an air flow is generated in the front space (11) from the bottom to the top.

The plurality of vent holes (83) on the downstream side of the front space (11) can be replaced with one slit hole extending in the width direction of the liquid crystal display (2).
Furthermore, the upper open channel (5) and the heat exchange wall (87) on the upstream side of the front space (11) can be omitted.

(1) Protection panel
(11) Front space
(2) Liquid crystal display
(20) Image display surface
(3) Upper circulation channel
(4) Lower circulation flow path
(5) Upper open channel
(6) Lower open channel
(7) Side circulation channel
(71) Exhaust fan
(72) Exhaust fan
(8) Case
(81) Bezel
(82) Back cabinet
(83) Vent
(84) Vent
(87) Heat exchange wall

Claims (5)

In the image display device in which the opening of the housing is closed by a light-transmitting protective panel, and the display is accommodated inside the housing facing the protective panel.
A front space formed between the protective panel and the display;
A circulation channel formed surrounding the front space;
One or more fans installed in the circulation channel;
A plurality of vent holes are provided between the circulation channel extending above or below the front space and the front space, and a plurality of vent holes are distributed and opened in the width direction of the display device. Image display device.   The image display device according to claim 1, wherein the circulation channel is adjacent to an open channel that is open to the outside air via a heat exchange wall.   The circulation channel has an upper circulation channel extending in the width direction of the display above the front space, and a lower circulation channel extending in the width direction of the display below the front space, The image display according to claim 1, wherein a plurality of vent holes are formed in the partition wall between the front spaces, and a plurality of vent holes are formed in the partition wall between the lower circulation channel and the front space. apparatus.   4. The image display device according to claim 3, wherein an intake fan is installed on both sides of one of the upper circulation channel and the lower circulation channel, and an exhaust fan is installed on both sides of the other channel. .   An upper open flow path and a lower open flow path are formed along the upper circulation flow path and the lower circulation flow path, and a heat exchange wall is interposed between the upper circulation flow path and the upper open flow path. The image display device according to claim 4, wherein a heat exchange wall is interposed between the lower open flow paths.

Images