JP2010107657A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a thin display while securing heat dissipation performance. <P>SOLUTION: The display is provided with a case 4 having a body 2 and a rear cover 3 closing the back, and a plurality of display units 5 arranged in vertical and horizontal directions at the front plane of the body 2. In the display, an intake hole 7 is provided at the rear cover 3, a discharge hole 8 is provided at an upper plane of the body 2, a sirocco fan 6 is arranged at a position of the intake hole 7 at the inside of the rear cover 3 with a suction hole 6a facing the intake hole 7 and with a discharging hole 6b facing a lower part, the outside air is absorbed in the case 4 from the intake hole 7 by the sirocco fan 6 and discharged to the lower part, then, heat accumulated in the case 4 is dissipated by discharging the air in the case 4 through the discharge hole 8 by increasing inner pressure from the lower part side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a large display device using a light emitting element such as an LED (light emitting diode), and more particularly to a cooling structure thereof.

In recent years, large display devices using LEDs or the like have become widespread as various information display devices in stadiums and the like. There are various types of light emitting elements used in display devices. For example, a large display device composed of LEDs or the like has many light emitting units mounted therein, and a power supply unit or the like is built in the housing. The temperature inside the housing rises due to their heat generation. When the temperature rise is significant, there arises a problem that the life of the electronic component is shortened.
Thus, for example, a large display device is disclosed in which a ventilation fan for heat dissipation is provided at the top of the housing, and the ventilation fan is driven to radiate heat to the outside of the housing through the ventilation holes on the top surface ( For example, see Patent Document 1).
In addition, a sirocco fan is installed in the upper part of the housing, and a guide is provided in the inner periphery of the rear case. There has been disclosed a plasma display device that is configured to be forced to convection downward, and the air forced to convection downward is naturally convected and is raised and cooled while contacting the inner surface of the rear case (for example, a patent). Reference 2).

JP-A-8-76694 (3rd page, FIG. 9) JP 2005-265922 A (page 9, FIG. 1)

Since a display device needs a larger installation space as it becomes larger, a thin display device is required in which the thickness of the device is reduced as much as possible.
In the conventional cooling structure of the display device shown in Patent Document 1, an axial fan is horizontally attached to the upper part of the casing of the display device, and the axial fan is driven to pass through a ventilation hole provided in the upper part of the casing. To dissipate heat outside the housing. Moreover, in the display device shown in Patent Document 2, a sirocco fan is arranged on the upper part so that the air rising on the inner surface of the housing is recirculated in a horizontal direction. For this reason, in any case, the depth dimension of the casing in which the fan is installed is required to be at least as large as the diameter of the fan, which is a problem in reducing the thickness of the casing. .

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a display device that is reduced in thickness while ensuring heat radiation performance.

  A display device according to the present invention includes a main body incorporating a power supply unit and a control board, a housing having a rear cover that closes the back surface of the main body, and a plurality of displays arranged vertically and horizontally on the front surface of the main body. In a display device including a unit, an air intake hole is provided in the rear cover, an air exhaust hole is provided in the upper surface of the main body, and the air intake port is directed to the air intake hole at the position of the air intake hole on the inner surface side of the rear cover. A sirocco fan is arranged with the outlet facing downward, and the sirocco fan sucks outside air from the intake hole into the housing and discharges it to the lower part. By discharging, the heat accumulated in the housing is dissipated.

  According to the display device of the present invention, outside air is introduced from the intake hole into the housing by the sirocco fan arranged at the position of the intake hole on the inner surface side of the rear cover with the suction port facing the intake hole and the discharge port facing the lower part. Suction and discharge to the bottom, the internal pressure is increased from the bottom side, the air inside the housing is discharged from the exhaust holes, and the heat accumulated in the housing is dissipated, so it is more efficient with a sirocco fan with a large static pressure Since air can be sucked and exhausted well, heat dissipation performance can be ensured, and the thickness direction of the sirocco fan can be matched to the thickness direction of the housing, which makes it possible to reduce the thickness of the housing. Thinning can be achieved.

Embodiment 1 FIG.
FIG. 1 is a perspective view of the display device according to Embodiment 1 as viewed from the front side (display surface side), and FIG. 2 is a perspective view of the display device as viewed from the inside of the housing with the rear cover of FIG. 1 removed. FIG. 3 is a side sectional view of the display device of FIG. Hereinafter, a description will be given based on the drawings. The display element will be described as an LED display device by taking an example using an LED element.

In FIG. 1, an LED display device 1 includes a main body 2 in which a power supply unit, a control board (not shown) and the like are accommodated, and a rear cover 3 that closes an open back surface of the main body 2. A body 4 and a plurality of LED units 5 (display units) arranged in a grid in the vertical and horizontal directions on the front side of the main body 2 of the housing 4 are configured.
A sirocco fan 6 is attached to the lower part on the inner surface side of the rear cover 3 inside the housing 4, and outside air is sucked from the air intake holes 7 (see FIGS. 2 and 3) provided in the rear cover 3. The air is discharged from the exhaust hole 8 provided on the upper surface of the main body 2.

The inner side of the rear cover 3 in FIG. 1 will be described in more detail with reference to FIG. Intake holes 7 are provided at two locations in the left-right direction on the lower side of the rear cover 3, and sirocco fans 6 are attached to the insides of the intake holes 7. Here, the sirocco fan 6 is attached with the suction port 6a facing the suction hole 7 and the discharge port 6b facing the lower side. At this time, in order to make the thickness direction as thin as possible, it is desirable to attach directly to the rear cover 3.
In the figure, the right sirocco fan 6 is removed from the rear cover 3.
Further, the number of sirocco fans 6 is not limited to two as shown in the figure, and may be determined as appropriate according to the size of the display device 1 and the amount of heat generated.

  As shown in the side sectional view of FIG. 3, a detachable fan guard 9 is provided on the outer side of the intake hole 7 of the rear cover 3, and a dustproof filter 10 is provided therein. Details of the fan guard 9 and the dust filter 10 will be described later. The fan guard 9 covers the intake hole 7 and is opened at the lower side, and external air is introduced from the lower side of the fan guard 9 and passes through the dust-proof filter 10 through the intake hole 7 as indicated by a thick arrow. The air enters the suction port 6a of the sirocco fan 6 and is discharged from the discharge port 6b to the lower part in the housing 4.

  In addition, by using a plurality of LED display devices 1 configured as described above and arranging them in a matrix, it is possible to freely configure a larger LED display device.

Next, the operation will be described. During the operation of the display device, the internal temperature rises due to heat generated from the LED units 5 arranged in a grid pattern, and heat generated from a power supply unit (not shown) built in the main body 2 and a control board. Therefore, the sirocco fan 6 attached to the rear cover 3 is controlled to rotate in conjunction with the operation of the display device 1.
As the sirocco fan 6 rotates, outside air is sucked into the housing 4. The sucked outside air is discharged from the discharge port 6b of the sirocco fan 6 facing downward. The internal pressure rose from the lower part of the casing 4 due to the discharged air, and the internal air was pushed up by the pressure and exhausted from the exhaust hole 8 at the upper part of the main body 2, thereby accumulating in the casing 4. Heat is dissipated and the internal temperature rise can be kept below a predetermined temperature.
The reason why the sirocco fan 6 is arranged on the lower side of the rear cover 3 is to allow outside air to be discharged to the lower part of the housing 4 as much as possible, so that more internal air can be easily exhausted. Depending on the size of the housing 4 and the like, the housing 4 may be disposed slightly above.

Here, the sirocco fan 6 having a low wind speed and a large static pressure is used as a cooling fan instead of an axial fan having a high wind speed, so that heat can be efficiently transferred to the casing 4 without stirring the heat inside the casing 4. It is possible to push from the bottom to the top.
The sirocco fan normally sucks in the axial direction of the rotating shaft of the blade and discharges it in the radial direction. Also, in the case of a capacity that is applicable to this apparatus, the axial thickness is the radial direction. Generally it is smaller than the size.
Directly into the rear cover 3 with the suction port 6a of the sirocco fan 6 directed toward the intake hole 7 (that is, with the rotation axis directed perpendicular to the surface of the rear cover 3) and the discharge port 6b directed toward the lower part of the housing 4. Since it is attached, since the dimension in the thickness direction of the sirocco fan 6 is smaller than in the case where the axial fan is attached horizontally, the casing 4 can be made thin.

  As described above, according to the display device of the first embodiment, the sirocco fan in which the suction port is directed toward the suction hole and the discharge port is directed downward at the position of the suction hole on the inner surface side of the rear cover. Is sucked into the housing through the air intake hole and discharged to the lower part, the internal pressure is increased from the lower side, the air in the housing is discharged from the exhaust hole, and the heat accumulated in the housing is dissipated. The sirocco fan with high pressure can efficiently intake and exhaust air, ensuring sufficient heat dissipation performance, and the thickness direction of the sirocco fan can be adjusted to the thickness direction of the housing, so the thickness of the housing can be reduced. Therefore, the display device can be thinned.

Embodiment 2. FIG.
FIG. 4 is a perspective view of the rear cover portion of the display device according to the second embodiment, and is a view seen from the inside side with the rear cover removed. FIG. 5 is a side sectional view of the display device. The overall perspective view of the display device as viewed from the front side is substantially the same as that of FIG. 1 to 3 are denoted by the same reference numerals, description thereof is omitted, and differences will be mainly described.

The difference from the first embodiment is that an intake hole and a sirocco fan are provided in the upper part of the rear cover. As shown in FIG. 4, intake holes 7 are provided at two locations in the left-right direction on the upper side of the rear cover 3, and sirocco fans 6 are attached to the insides of the intake holes 7. Here, the sirocco fan 6 is directly attached to the rear cover 3 so that the suction port 6a is in contact with the rear cover 3, and the discharge port 6b is directed downward.
Further, a duct 11 is provided on the discharge port 6b side. The duct 11 is arranged on the inner surface of the rear cover 3 so that one end is connected to the discharge port 6b of the sirocco fan 6 and the other end extends to the lower part in the housing 4 as shown in the figure, and extends to the vicinity of the lower part of the rear cover 3, The tip side is bent in a direction away from the rear cover 3. For the duct 11, for example, a tubular member made of metal or synthetic resin formed so as to fit the discharge port 6b may be used. A flexible hose may also be used. In FIG. 4, the right sirocco fan 6 and the duct 11 are shown detached from the rear cover 3.
The number of intake holes 7 is not limited to two, and the number may be determined as appropriate according to the size of the display device and the amount of heat generated.

As shown in the side sectional view of FIG. 5, a removable fan guard 9 equivalent to that of FIG. 3 of the first embodiment and a dustproof filter 10 are provided on the outer side of the intake hole 7 of the rear cover 3. .
When the sirocco fan 6 rotates, outside air is introduced from the lower side of the fan guard 9 as shown by a thick arrow, passes through the dust filter 10, enters the suction port 6 a of the sirocco fan 6 through the intake hole 7, and discharges. It is discharged from the outlet 6 b to the lower side, passes through the duct 11, and is discharged to the lower part in the housing 4. The internal pressure in the housing 4 rises from the lower side due to the air that has reached the bottom of the housing 4, and the heat accumulated inside the housing 4 is pushed up together with the air and discharged to the outside through the upper exhaust hole 8.

  As described above, the LED display device may be configured in a larger display device by arranging a large number of the shapes shown in the figure in a matrix shape. In some cases, it is difficult to provide the rear cover 3 on the lower side as described in FIG. In that case, by adopting the configuration of the present embodiment, the sirocco fan 6 can be arranged on the upper portion of the rear cover 3, so that the degree of freedom of arrangement of the intake holes 7 (and sirocco fan 6) is increased.

  As described above, according to the display device of the second embodiment, the air intake hole and the sirocco fan are provided in the upper part of the rear cover, and one end is connected to the discharge port of the sirocco fan and the other end has a duct extending to the lower part in the housing. Since the outside air sucked into the housing by the sirocco fan passes through the duct and is discharged to the lower part of the housing, in addition to the effects of the first embodiment, the position of the sirocco fan disposed on the rear cover can be freely set. The degree is increased and it can cope with various installation environments.

Embodiment 3 FIG.
FIG. 6 is a perspective view of the rear cover portion of the display device according to the third embodiment, and is a view seen from the inside side with the rear cover removed. FIG. 7 is a side sectional view of the display device. The overall perspective view of the display device as viewed from the front side is substantially the same as that of FIG. In addition, since the present embodiment is similar to the second embodiment, the same parts as those in FIGS. 4 and 5 are denoted by the same reference numerals and the description thereof will be omitted, and the differences will be mainly described.

  The difference from the second embodiment is the shape of the duct that is connected to the sirocco fan. As shown in FIG. 6, intake holes 7 are provided at two locations in the left-right direction on the upper side of the rear cover 3, and a sirocco fan 6 is attached inside each of the intake holes 7, and is connected to the discharge port 6b. A metal duct 12 is fixed to the rear cover 3. In the figure, the sirocco fan 6 and the duct 12 on the right side are shown detached from the rear cover 3. The number of intake holes 7 is not limited to two.

The duct 12 is formed by bending a metal plate material into a groove shape (a U-shaped cross section). And the edge part is further bend | folded outside in the L-shape, and the attaching part 12a is formed. The mounting portion 12a is brought into contact with the rear cover 3 and fixed by riveting or screwing.
At the lower end, a notch 12b is provided on the bottom side of the U-shaped cross section. Further, a guide plate 13 for guiding the flow of air discharged from the lower part of the duct 12 to the inner lower part of the housing 4 is fixed to the rear cover 3 inside the duct 12 facing the notch 12b.

The operation and the action of the duct will be described with reference to the side sectional view of FIG.
As in the second embodiment, outside air is introduced from the lower side of the fan guard 9, passes through the dust filter 10, enters the suction port 6 a of the sirocco fan 6 through the suction hole 7, and is discharged from the discharge port 6 b facing the lower side. The air is directly led to the lower part through the duct 12. The air reaching the lower end opening of the duct 12 is changed in the flow direction by the guide plate 13 and flows toward the lowermost portion of the housing 4. The internal pressure rises from the lower side in the housing 4 due to the air reaching the lowermost portion, and the heat accumulated inside is pushed up together with the air by the pressure, and is discharged outside through the exhaust hole 8 in the upper part of the main body 2.
By making the cross-sectional shape of the duct 12 the same as that of the discharge port 6 b of the sirocco fan 6, pressure loss can be prevented and, at the same time, the thickness dimension can be made the same as the thickness of the sirocco fan 6. Further, the cross-sectional shape of the duct 12 is effective for increasing the secondary moment of the cross-section of the duct 12, and can be used as a reinforcement of the rear cover 3 by being attached to the rear cover 3.

  As described above, according to the display device of the third embodiment, the duct is made of a metal plate bent in a groove shape and fixed to the rear cover, and is sucked into the duct near the lower opening end of the duct. In addition to the effects of the second embodiment, the strength of the rear cover can be reinforced with a simple configuration, and the structure of the housing is simplified. it can.

Embodiment 4 FIG.
FIG. 8A is a perspective view of the display device according to the fourth embodiment as viewed from the back side, and particularly shows details of the fan guard portion. Moreover, FIG.8 (b) is the fragmentary sectional view seen from bb of (a). Since the overall view of the display device is the same as FIG. 1 of the first embodiment, illustration and description thereof are omitted. The present embodiment relates to the fan guard part of the first to third embodiments described above. Hereinafter, a description will be given based on the drawings.

The fan guard 9 provided on the rear surface of the display device is formed by bending a thin plate into a box shape, and the opposite surface and the lower surface of the rear cover 3 facing the intake hole 7 are open. Moreover, the edge part of both sides is bent outside in the L-shape, and is set as the attachment leg 9a. Furthermore, the dustproof filter 10 can be held inside.
On the other hand, a mounting plate 14 for mounting the fan guard 9 is provided on the rear cover 3 side. As shown in FIG. 8B, the mounting plate 14 is fixed to the rear cover 3 with a spacer 15 slightly thicker than the thickness of the mounting foot 9a of the fan guard 9, and fixed with rivets or screws. . A locking portion (not shown) is provided at the lower end of the spacer 15 so as not to slide down when the fan guard 9 is attached.

The fan guard 9 configured as described above can be removed simply by sliding it upward as indicated by a thick arrow in FIG. Further, the dustproof filter 10 is fitted and attached to a locking portion provided on the fan guard 9 so that it can be easily attached and detached. This makes it possible to maintain and replace the dust filter 10 without using a tool or the like.
8 and 9 show an example of the structure of the fan guard 9 and the dust filter 10, and the present invention is not limited to the figure, and it is only necessary to be detachable from the outside of the display device.

  In the first to fourth embodiments, the case where the LED element is employed as the display element has been described. However, the display element is not limited to this, and may be, for example, a plasma display element or a liquid crystal display element.

  As described above, according to the display device of the fourth embodiment, the fan guard equipped with the dustproof filter is detachably provided at the position of the intake hole on the outer surface side of the rear cover. A display device with improved maintainability can be obtained.

1 is a perspective view of a display device according to Embodiment 1 of the present invention. It is the perspective view which looked at the rear cover part of FIG. 1 from the inner side. It is side surface sectional drawing of the display apparatus by Embodiment 1 of this invention. It is a perspective view of the rear cover part of the display apparatus by Embodiment 2 of this invention. It is side surface sectional drawing of the display apparatus by Embodiment 2 of this invention. It is a perspective view of the rear cover part of the display apparatus by Embodiment 3 of this invention. It is side surface sectional drawing of the display apparatus by Embodiment 3 of this invention. It is detail drawing of the fan guard part of the display apparatus by Embodiment 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LED display device (display device) 2 Main body 3 Rear cover 4 Case 5 LED unit (display unit) 6 Sirocco fan 6a Suction port 6b Discharge port 7 Intake hole 8 Exhaust hole 9 Fan guard 9a Mounting foot 10 Dustproof filter 11, 12 Duct 12a Mounting portion 12b Notch 13 Guide plate 14 Mounting plate 15 Spacer.

Claims (4)

A main body incorporating a power supply unit and a control board, a housing having a rear cover that closes the back surface of the main body, and a plurality of display units arranged vertically and horizontally on the front surface of the main body. In the display device,
The rear cover is provided with an intake hole, the upper surface of the main body is provided with an exhaust hole, the intake hole is located on the inner surface side of the rear cover, the suction port is directed toward the intake hole, and the discharge port is disposed at the lower part. A sirocco fan is arranged towards the
The sirocco fan accumulates air inside the housing by sucking outside air into the housing from the intake hole and discharging it to the lower part, and increasing the internal pressure from the lower side to exhaust the air in the housing from the exhaust hole. A display device characterized in that the generated heat is dissipated.   The display device according to claim 1, wherein the intake hole and the sirocco fan are provided on an upper side of the rear cover, and one end is connected to the discharge port of the sirocco fan and the other end extends to a lower part in the housing. The display device is characterized in that the outside air sucked into the casing by the sirocco fan is discharged to the lower part of the casing through the duct.   3. The display device according to claim 2, wherein the duct is made of a metal plate bent in a groove shape and fixed to the rear cover, and the outside air sucked into the duct near the lower opening end of the duct. A display device, comprising a guide plate for guiding the liquid crystal to an inner lower portion of the housing.   4. The display device according to claim 1, wherein a fan guard provided with a dustproof filter is detachably provided at a position of the intake hole on the outer surface side of the rear cover. Display device.

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