JP2000089682A - Video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video display device decreased in the noises caused by an air cooling fan as a sound source by improving a heat radiation characteristic of a display panel. SOLUTION: This video display device is structured so that a display panel is cooled by arranging a partition plate 33 behind the back of a display panel 1 via a supporting body 7 forming a predetermined gap for a path of cooling air, and cooling the display panel 1 with the air passing through this gap upward. Moreover, the device can be structured so as to be further improved in the cooling characteristic by attaching cooling fins in the gap via a heat conductive member on the back of the display panel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video display device such as a plasma display panel device, and more particularly to a cooling structure for efficiently cooling a display panel disposed inside a housing of a video display device. .

[0002]

2. Description of the Related Art In recent years, a plasma display device (hereinafter, referred to as a PDP) has become a large-screen, thin and lightweight video display device.
(Abbreviated as device) is being put to practical use. A conventional PDP device will be described with reference to the drawings. FIG. 4 is an exploded perspective view illustrating the structure of a conventional PDP device 72. The PDP device 72 shown in FIG. 4 has a housing 10 formed by combining a front housing 10A and a rear housing 10B into one.
A and 10B, and an internal unit 110 housed in the housings 10A and 10B. Internal unit 1
Reference numeral 10 includes a display panel 100 and a frame chassis 300. Although the detailed structure is not shown, the display panel 100 is formed by bonding two glass substrates facing each other with a predetermined gap. The frame chassis 300 is formed of a metal such as aluminum having both good mechanical rigidity and good thermal conductivity. The display panel 1 is provided on the front of the frame chassis 300.
00 is adhered in close contact with the highly adhesive double-sided tape 200. On the other hand, cooling fins 320 are provided on the rear surface of the frame chassis 300, and an electric circuit board 350 for driving the display panel 100 is attached. Further, the frame chassis 300 has bosses 310 at four corners on the rear surface thereof, and is fixed to the rear housing 10B by the bosses 310. The rear housing 10B and the front housing 10A are provided with heat radiation holes 4 on the upper and lower sides of each side.
5, 46 and 65, 66, and are combined so as to surround the display panel 100 and the frame chassis 300.

[0003] In the conventional PDP device 72 configured as described above, a cooling fan (not shown) is mounted on the upper surface of the rear housing 10B, and when the PDP device 72 operates, the display panel 100 generates heat. The heated high-temperature air inside is discharged to the outside through the heat radiation holes 45 and 65. Thereby, the temperature rise of the display panel 1 in the conventional PDP device is suppressed. When the cooling fan attached to the upper surface of the rear housing 10B causes a part of the air sucked through the heat radiation holes 46 and 66 on the lower side of the housing to pass through the rear surface of the frame chassis 300, the display panel The heat conducted from 100 to the frame chassis 300 is taken away, and the hot air inside the housing is released to the outside through the heat radiation holes 45 and 55 on the upper side of the housing. As a result, the temperature rise of the display panel 100 in the housing of the conventional PDP device is suppressed, and the damage of the display panel 1 due to the high temperature is prevented.

[0004]

In recent years, image display devices such as PDP devices characterized by a thin large screen have tended to have a large screen, and at the same time, the driving power of the display panel has been increasing in order to realize high image quality. It tends to increase. Therefore, in the conventional cooling structure, the air passing through the rear surface of the frame chassis is obstructed by components such as the electric circuit board, and secures a sufficient air flow rate for cooling, thereby preventing damage to the display panel. Therefore, it is necessary to set the operating voltage of the cooling fan to be high to increase the number of revolutions or to increase the size of the cooling fan. As a result, the conventional video display apparatus has a problem that noise generated by a cooling fan as a sound source increases and the apparatus itself becomes large. Such a problem in the cooling mechanism of the video display device has been a problem to be solved more and more because it is necessary to increase the driving power of the display panel in order to realize high image quality.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the cooling efficiency of a display panel, to lower the operating voltage of a cooling fan and to set a lower rotation speed, and to reduce the size of the cooling fan. It is an object of the present invention to provide a video display device capable of reducing noise due to noise.

[0006]

To achieve the above object, an image display apparatus according to the present invention comprises a display panel, a partition plate disposed on the back side of the display panel and having an electric circuit board mounting structure. A support for attaching the partition so that a predetermined gap is formed between the display panel and the partition; and a housing for accommodating the display panel, the partition, and the support. I do. With this configuration, in the video display device of the present invention, since the partition plate is arranged on the back side of the display panel with a predetermined gap therebetween,
The display panel can be directly cooled by the air passing through the gap. Therefore, according to the image display device of the present invention, the heat radiation characteristics of the display panel are improved, the operating voltage of the cooling fan can be set low, and the cooling fan can be downsized.

In the image display device of the present invention, a sheet-like heat conducting member may be attached to at least a part of the back surface of the display panel. In the image display device of the present invention, cooling fins attached to the back surface of the display panel via the heat conductive member may be provided in the gap.
Further, in the image display device of the present invention, the shape of the fin of the cooling fin may have a through hole in a cooling surface of the fin. In the image display device of the present invention, the fins of the cooling fins may be arranged in a lattice shape such that two fins having different heights are substantially orthogonal to each other. In the image display device of the present invention, the heat conduction member may be formed integrally with the cooling fin. In the video display device according to the aspect of the invention, the support may be configured to be supported by a housing with the partition plate interposed therebetween. In the image display device of the present invention, the support has a thin-walled shape and is formed of a member having a substantially linear passage space, and the passage space is disposed substantially parallel to the flow direction of the cooling air. It may be. Since the image display device of the present invention is configured as described above, the operating voltage of the cooling fan can be set low, and the size of the cooling fan can be reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments 1 and 2 of a video display device according to the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIG. 1 is an exploded perspective view showing a configuration of a PDP device 12 which is a first embodiment of a video display device according to the present invention. The PDP device 12 according to the first embodiment includes housings 5A and 5B formed by combining a front housing 5A and a rear housing 5B into one, and an internal unit 11 housed in the housing. . A plurality of heat radiation holes 65 and 66 are formed in the upper side surface and the lower side surface of the front housing A5 in the width direction, respectively. Further, a light transmitting portion 63 made of glass is provided on the front surface of the front housing 5A. Further, a plurality of heat radiating holes 45 and 46 are formed in the width direction in each of the upper side surface and the lower side surface of the rear housing 5B. Further, a mounting hole 42 for mounting the internal unit 11 is formed on the rear surface of the rear housing 5B.

As shown in FIG. 1, the internal unit 11
It has a display panel 1, a support 7, a reinforcing frame 8 and a partition plate 33. The partition plate 33 is formed by a thin plate made of aluminum and having a thickness of about 1 mm, and a plurality of electric circuit boards 35 are attached to the back surface of the partition plate 33. The support 7 is linearly arranged in the vertical direction between the display panel 1 and the partition plate 33, and is formed of a thin rectangular member made of aluminum and having a rectangular cross section of about 10 to 20 mm square. The reinforcing frame 8 is formed of a thin square member made of aluminum and disposed on the back surface of the partition plate 33 and having a rectangular cross section of about 20 mm square.

On the back of the display panel 1, a support 7 made of a square material is attached by a double-sided tape 2 so that the internal space thereof is the same as the flow direction of the cooling air.
The reinforcing frame 8 is screwed to the support 7 with the partition plate 33 interposed therebetween. The electric circuit board 35 performs light emission driving of the display panel 1 and control thereof. The display panel 1 is configured by laminating two glass substrates, a front plate and a back plate, and the front plate is formed longer in the long side direction and shorter in the short side direction than the rear plate (shown in the drawing). Zu). Therefore, portions that do not overlap the front plate and the back plate are present on the long side portion and the short side portion, respectively, and terminals (not shown) connected to the electrodes in the display panel 1 are formed on the non-overlapping portions. ing. A plurality of film-like wirings (not shown) having a male connector at the tip are crimped to the terminals, and the male connector is a female connector (not shown) provided at the edge of each electric circuit board 35. Respectively, the electrical circuit board 35 and the display panel 1 are electrically connected.

As described above, the PDP device 12 of the first embodiment
In the case, a space of about 10 to 20 mm is secured between the display panel 1 and the partition plate 33 by the support 7 so that some air in the housing directly removes heat from the display panel 1 while passing through this space. It is configured. Therefore, the PD of the first embodiment
In the P device, there is no obstacle such as the electric circuit board 35 on the back side of the display panel 1 where the heat is high, and a sufficient amount of air for cooling the display panel 1 can be obtained. As a result, P of Example 1
The DP device sets the operating voltage of the cooling fan low,
It is possible to reduce the size of the cooling fan. Since the PDP device of the first embodiment is configured as described above,
Noise from the cooling fan as a sound source can be significantly reduced. According to the experiment of the inventor, the light emitting surface area was 7500 c
If the driving power of the display panel 1 having a size of about m ² is within 300 watts, the display panel 1 does not need a cooling fan.
It was confirmed by a heat resistance test that breakage of the steel could be prevented.
Therefore, when it is not necessary to provide the cooling fan, the noise from the cooling fan as a sound source can be completely eliminated.

In the first embodiment, the electric circuit board 3
5 is optimally arranged and the thickness of the electric circuit board 35 is reduced, so that the PDP device 12 achieves the same thickness as the conventional one. In addition, since a sheet-like heat conductive member 9 having excellent heat conductivity is attached to a part or the whole of the rear surface of the display panel 1, an effect of equalizing the temperature distribution of the display panel 1 is obtained. This can prevent the display panel from being damaged.

In the first embodiment, an example in which the support 7 is formed of a thin hollow square member having a rectangular cross section has been described, but the support 7 is provided on the back side of the display panel 1 so as to be parallel to the air flow direction. The present invention is not limited to the configuration as in the first embodiment as long as it has a shape that allows passage of air. For example, the shape of the support may be H-shaped, L-shaped, or the like. Similar effects can be obtained with O-type, N-type, U-type, M-type, U-shape, and the like. In the first embodiment, an image display device using a plasma display as the display panel 1 has been described. However, it is needless to say that the technical idea of the present invention can be applied to an image display device in which the display panel is a liquid crystal panel. Absent.

Second Embodiment Next, a second embodiment of the video display device according to the present invention will be described with reference to the drawings. FIG. 2 is an exploded perspective view illustrating a configuration of a PDP device 22 according to a second embodiment of the video display device according to the present invention. PD of Example 2
The P device 22 has a sheet-like heat conducting member 9 attached to the back surface of the display panel 1, and a cooling fin 32 made of aluminum is attached to the heat conducting member 9. The heat conductive member 9 has adhesive properties on both sides, and is configured so that the display panel 1 and the cooling fins 32 can be easily positioned. The PDP device 22 according to the first embodiment is different from the PDP device according to the first embodiment in that the PDP device 22 according to the second embodiment uses the internal unit 13 provided with the heat conducting member 9 and the cooling fin 32 as described above.
Different from P device. According to the PDP device 22 of the second embodiment configured as described above, the PDP
The effective contact area with the cooling air is enlarged by the cooling fins 32 as compared with the device 12. Therefore, in the PDP device according to the second embodiment, the heat radiation efficiency is significantly improved. According to the experiment by the inventor, the image display device of the second embodiment has a light emitting surface area of about 7500 cm ² , if the driving power of the display panel 1 is 400 watts or less, the display panel 1 does not need a cooling fan. It was confirmed by a heat resistance test that breakage of the steel could be prevented. Therefore, when it is not necessary to provide the cooling fins, the noise from the cooling fan as a sound source can be completely eliminated.

In the PDP device 22 according to the second embodiment, the case where the cooling fin 32 is made of aluminum has been described. However, the heat conducting member is made of the same aluminum, and the cooling fin is integrated with the heat conducting member. By eliminating the heat conduction resistance at the joint surface between the heat conduction member and the cooling fin, the heat dissipation characteristics are further improved as compared with the PDP device of the second embodiment.

Next, another embodiment of the fin shape of the cooling fin formed on the heat conducting member will be described. FIG.
FIG. 3 is a perspective view showing various fin shapes of cooling fins.
The cooling fin 50 shown in FIG. 3A is a cooling fin having the general shape described in the second embodiment, and the height and the pitch of the fin 50a are substantially the same. The cooling fin 51 shown in FIG. 3B has a through hole 51b formed in a side surface of the fin 51a.
Is provided. In the cooling fin 51 of this shape,
In the forced air cooling by the cooling fan, the through holes 51b
As a result, the air flow is disturbed, so that the heat radiation characteristics are improved. The size of the through hole 51b is 40 to 60 of the height of the fin 51a.
% Is desirable. Cooling fins 52 shown in FIG.
Are vertical fins 52a and horizontal fins 52b
Are arranged orthogonally, and fins 52a and 52b are arranged in a lattice shape. In the cooling fins 52 shown in FIG. 3C, the height of the fins 52b in the horizontal direction is lower than the height of the fins 52a in the vertical direction. Also in the cooling fins 52 having this shape, in the forced air cooling using the cooling fan, the high fins 52a and the low fins 5a are formed.
Experiments have confirmed that the turbulence of air occurs in the space partitioned by 2b and thus the heat radiation characteristics are improved. In this cooling fin 52, a horizontal fin 52b with respect to a height of a vertical fin 52a is provided.
Is desirably about 30 to 50%.

In the second embodiment, an image display device using a PDP device for the display panel 1 has been described.
The present invention is not limited to this, and it goes without saying that the present invention can also be applied to a video display device in which the display panel is configured by a liquid crystal panel.

[0019]

As described above, in the image display device of the present invention, a space is secured between the display panel and the partition plate, and heat is directly taken from the display panel while air in the housing passes through this space. With such a configuration, there is no obstacle such as an electric circuit board in the cooling passage, a sufficient amount of air for cooling the display panel is obtained, and excellent heat radiation characteristics are exhibited. Therefore, in the video display device of the present invention, it is possible to set the operating voltage of the cooling fan to be low and to achieve the miniaturization of the cooling fan. As described above, since the image display device of the present invention does not need to increase the rotation speed of the cooling fan, it is possible to greatly reduce noise generated by the cooling fan as a sound source. Further, in the video display device of the present invention, when the display panel is driven within a predetermined drive power, the display panel can be prevented from being damaged by high heat without a cooling fan. Noise can be completely eliminated.

[Brief description of the drawings]

FIG. 1 is a PDP according to a first embodiment of a video display device according to the present invention.
FIG. 2 is an exploded perspective view showing the configuration of the device.

FIG. 2 is a PDP according to a second embodiment of the video display device according to the present invention;
FIG. 2 is an exploded perspective view showing the configuration of the device.

FIG. 3 is a perspective view showing various shapes of cooling fins in the image display device according to the present invention.

FIG. 4 is an exploded perspective view showing a configuration of a PDP device of a conventional image display device.

[Description of Signs] 1 Display panel 5A Front housing 5B Back housing 7 Support body 9 Thermal conductive member 11 Internal unit 12 PDP device 33 Partition plate 35 Electric circuit board 45 Heat dissipation hole 46 Heat dissipation hole 65 Heat dissipation hole 66 Heat dissipation hole

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yozo Kita 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. F-term (reference) 5G435 AA12 BB06 EE05 GG43 GG44 KK01

Claims (8)

[Claims] 1. A display panel, a partition plate disposed on the back side of the display panel and having an electric circuit board mounting structure, and a predetermined gap is formed between the display panel and the partition plate. An image display device, comprising: a support for attaching the partition plate to the display panel; and a housing for housing the display panel, the partition plate, and the support. 2. The image display device according to claim 1, wherein a sheet-like heat conductive member is attached to at least a part of a back surface of the display panel. 3. The image display device according to claim 1, wherein cooling fins attached to the rear surface of the display panel via the heat conducting member are provided in the gap. 4. The fin of the cooling fin has a through hole in a cooling surface of the fin.
3. The video display device according to 1. 5. The image display device according to claim 3, wherein the fins of the cooling fins are arranged in a lattice shape with two fins having different heights substantially orthogonal to each other. 6. The image display device according to claim 2, wherein said heat conducting member is formed integrally with a cooling fin. 7. The structure according to claim 1, wherein the support is configured to be supported by a housing with the partition plate interposed therebetween.
The image display device according to any one of claims 2, 3, 4, 5, and 6. 8. The support body is formed of a member having a thin-walled shape and having a substantially linear passage space, and the passage space is disposed substantially parallel to a flow direction of the cooling air. Claims 1, 2, 3, 4,
The video display device according to claim 5, 6, or 7.