JP2000112370A - Video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a frame chassis structure which satisfies both of falling strength and heat radiation characteristic by providing the reinforcing frames disposed on the rear surface of the frame chassis with vent holes and further improving the heat radiation characteristic by a method of arranging these vent holes. SOLUTION: The frame chassis 3 consists of the structure which is provided with the reinforcing frames 32 and 33 in a grid form so as to intersect orthogonally the respective sides of a display panel 1 on the rear surface and is provided with the vent holes at both of the reinforcing frames 32 and 33 at nearly equal intervals. The deflection of the display panel 1 induced by the falling impact during, for example, transportation, is suppressed and the damage of the display panel 1 can be avoided by such structure. In addition, the air heading above to below on the rear surface of the frame chassis 3 passes the vent holes 34 and 35 even in both of use of vertical placement and horizontal placement, thereby, a sufficient air flow rate may be obtained. Cooling efficiency is, therefore, improved to suppress the temperature elevation of the display panel 1, and the damage of the display panel 1 occurring due to temperature elevation can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device such as a plasma display panel device (hereinafter referred to as a PDP device), and more particularly, to an image display device having a frame chassis structure that satisfies both drop strength and heat radiation characteristics. It is about.

[0002]

2. Description of the Related Art In recent years, a PDP device characterized by a thin large screen and expected as a wall-mounted TV in the future has been put into practical use. The conventional PDP device 12 will be described with reference to FIG. The display panel 1 is formed by laminating two glass substrates facing each other with a predetermined gap. Frame chassis 3
Is formed by die-casting a metal such as aluminum having both good mechanical rigidity and thermal conductivity. On the front surface, a display panel 1 is provided with a heat conductive member 9 with a highly adhesive double-sided tape 2. The reinforcing bars 32 and 33 are provided on the back side to avoid damage due to bending of the display panel,
An electric circuit board 39 is attached.

The frame chassis 3 has bosses 31 at four corners on the rear surface, and is fixed to the rear housing 4 by the bosses 31. The rear housing 4 and the front housing 6 are provided with heat radiating holes 45 and 4.
6 (not shown), 65 and 66, and the display panel 1
And the frame chassis 3. A cooling fan (not shown) is attached to the upper surface of the rear housing 4, and the internal high-temperature air generated during the operation of the PDP device 12 is discharged to the outside through the heat radiating holes by the cooling fan. Temperature rise is suppressed. More specifically, the housing 10 is provided by a cooling fan.
A part of the air sucked from the outside through the heat radiation holes 46 and 66 removes the heat conducted from the display panel 1 to the frame chassis 3 while passing through the back of the frame chassis 3. The radiation from the heat radiation holes 45 and 65 to the outside of the housing 10 suppresses a rise in the temperature of the display panel 1 and avoids damage to the display panel 1.

[0004]

However, in the above structure, the air passing through the rear surface of the frame chassis 3 is not able to obtain a sufficient air flow rate due to the obstacles of the reinforcing bars 32 and 33. The function of suppressing the temperature rise is not sufficient, and if an excessive temperature rise occurs, there is a problem that the display panel 1 is damaged.

If the drive voltage of the cooling fan is increased to solve this problem, damage to the display panel can be avoided. However, noise from the cooling fan as a sound source becomes a problem, and power consumption increases and further heat is generated. There are problems such as occurrence of These problems become more serious as the driving power of the display panel 1 increases in order to realize high image quality.

[0006]

In order to solve the above-mentioned problems, a video display device according to the present invention is provided with a ventilation hole provided in a reinforcing bar provided on the back of a frame chassis. Further, the heat radiation characteristics are further improved by the arrangement method of the ventilation holes, and even if there is no cooling fan, the display panel is not damaged.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to an image display device in which the rear surface of the display panel and the front surface of the frame chassis are in close contact with a heat conductive member interposed therebetween, wherein the rear surface of the frame chassis has ventilation holes. An image display device provided with a reinforcing bar is provided. With such a configuration, the cooling efficiency of the device can be improved.

Hereinafter, the present invention will be described with reference to the accompanying drawings. The operation is the same as that of the conventional example, and the description is omitted. (Embodiment 1) FIG. 1 is a perspective view of a frame chassis 3 of a video display device according to the present invention. The frame chassis 3 is provided with reinforcing bars 32 and 33 in a lattice shape on the back surface so as to be orthogonal to each side of the display panel 1.
Both 2 and 33 have a structure in which ventilation holes are provided at substantially equal intervals. In this structure, since the reinforcing bars 32 and 33 are provided, it is possible to suppress the bending of the display panel 1 caused by, for example, a drop impact during transportation, and to prevent the display panel from being damaged. In addition, even when used vertically or horizontally, the air flowing upward from the bottom of the frame chassis 3 from the bottom can pass through the ventilation holes 34 and 35 to obtain a sufficient air flow, thereby improving the cooling efficiency. In addition, it is possible to suppress a rise in the temperature of the display panel and to avoid damage to the display panel due to the rise in the temperature.

The ventilation hole 35 of the reinforcing bar 33 has a structure necessary for use in a vertical installation. (Embodiment 2) FIG. 2 is a perspective view of a frame chassis 3 of a video display device according to an embodiment of the present invention. The frame chassis 3 is provided with reinforcing bars 32, 33 in a lattice shape on the back surface so as to be orthogonal to each side of the display panel 1, and penetrates the reinforcing bars 32, 33 in the same direction indicated by a dashed line. It has a structure in which ventilation holes 34 and 35 are provided. This structure is an embodiment when the frame chassis 3 is die-cast. In this structure, the same effects as in the first embodiment can be obtained, and at the same time, in the case of die-casting, all the ventilation holes 34 and 35 can be die-cast by providing a core that moves in the direction indicated by the alternate long and short dash line. Therefore, post-processing of the ventilation holes 34 and 35 is not required, and cost increase is not a problem.

The ventilation hole 35 of the reinforcing bar 33 has a structure necessary for use in a vertical position. (Embodiment 3) FIG. 3 is a perspective view of a frame chassis 3 of a video display device according to an embodiment of the present invention. The frame chassis 3 is provided with reinforcing bars 32, 33 in a lattice at a predetermined angle that is not perpendicular to each side of the display panel 1 on the back surface. The reinforcing bars 32, 33 are provided at one point perpendicular to the long side of the display panel. It has a structure in which ventilation holes 34 and 35 are provided so as to penetrate in the same direction indicated by a chain line. This structure is an embodiment when the frame chassis 3 is die-cast. In this structure, the same effect as in the first embodiment can be obtained, and at the same time, in the case of die-casting, all the ventilation holes 34 and 35 can be die-cast by providing a core that moves in the direction indicated by the alternate long and short dash line. Therefore, ventilation hole 3
No post-processing of 4, 35 is required, and cost increase is not a problem. (Embodiment 4) FIG. 4 shows a PD according to an embodiment of the present invention.
FIG. 3 is a perspective view of a frame chassis 3 of the P device (video display device). In the frame chassis 3, reinforcing bars 32, 33 are arranged in a grid pattern on the back surface so as to be orthogonal to each side of the display panel, and the reinforcing bars 32 are identical to the long sides of the display panel 1 indicated by a dashed line. Ventilation holes 3 to penetrate in the direction
4 is provided, and the reinforcing bar 33 is provided with a ventilation hole 35 penetrating the frame chassis 3. This structure is an embodiment when the frame chassis 3 is die-cast. With this structure, the same effects as in the first embodiment can be obtained, and at the same time, when the die casting is performed, the ventilation holes 34
Is made of a core, and the ventilation holes 35 are formed by the projection structure of the rear die, so that all the ventilation holes 34 and 35 can be die-cast. The effect of not being obtained is obtained.

The ventilation hole 35 of the reinforcing bar 33 has a structure necessary for use in a vertical position. (Embodiment 5) FIG. 5 is a perspective view of a frame chassis 3 of an image display device according to an embodiment of the present invention. FIG. 9 shows the result of measuring the temperature distribution of the display panel. The frame chassis 3 is provided with reinforcing bars 32 and 33 in a lattice shape on the back surface so as to be orthogonal to each side of the display panel 1. Thus, a ventilation hole 34 is provided so that the reinforcing bar 33 is provided with ventilation holes 35 at substantially equal intervals. This is because, as shown in FIG. 9, the temperature distribution of the display panel is high in the central part and low in the peripheral part, so that the air flow in the central part of the display panel is made more active than in the peripheral part. The cooling efficiency has been improved.

In this structure, when focusing on the cells surrounded by the reinforcing bars 32 and 33, in the central cell where the ventilation holes 34 are densely provided to reduce the air resistance, the ventilation holes 34 are sparsely provided and the air resistance is reduced. A larger air flow rate can be obtained from the enlarged peripheral cell, and a larger air flow rate can be ensured by the air flowing from the peripheral cell. Therefore, by increasing the air flow rate in the central part of the display panel where the temperature rise is large, and by flowing more air flow than necessary in the peripheral part of the display panel where the temperature rise is small, the entire display panel is effectively cooled can do.

The ventilation hole 35 of the reinforcing bar 33 is a structure necessary for use in a vertical installation. (Embodiment 6) FIG. 6A is a perspective view of a frame chassis 3 of a video display device according to an embodiment of the present invention. The reinforcing bars 32 are provided with reinforcing bars 32 and 33 in a lattice shape on the back side so as to be orthogonal to each side of the display panel 1. The reinforcing bars 32 are densely arranged at the center of the display panel and sparse at peripheral portions. The reinforcing bar 33 is provided with ventilation holes 35 at substantially equal intervals. FIG.
(B) is a cross-sectional view of the reinforcing bar 32 cut along a plane parallel to the display panel.

The reinforcing bar 32 is thick at the center of the display panel and thin at the periphery. This is reinforcing bar 3
A vent hole 34 is provided at the center of the display panel 2 so that the strength of the central part is reduced, and the stress concentration at the center of the display panel is prevented from increasing when the display panel is bent. . In the present embodiment, when the thickness of the central portion is set to be about 1.5 times the thickness of the peripheral portion, the same deformation occurs as in the case where the thickness is uniform and the ventilation holes are provided evenly.

With this structure, the same effects as in the fifth embodiment can be obtained, and at the same time, when the display panel is bent due to, for example, a drop impact, the stress concentration on the center of the display panel can be reduced. A structure with high impact resistance that can avoid breakage of the substrate can be realized. FIG. 6 (c)
Indicates a shape of the reinforcing bar 32 viewed from a direction parallel to the display panel, and has a structure in which the same effect as the reinforcing bar is obtained. In the above structure, the strength of the reinforcing bar is adjusted by the thickness of the reinforcing bar, whereas in this structure, the strength of the reinforcing bar is adjusted by the height of the reinforcing bar.

The ventilation hole 35 of the reinforcing bar 33 has a structure necessary for use in a vertical installation. (Embodiment 7) FIG. 7 is a perspective view of a frame chassis 3 of a video display device according to an embodiment of the present invention. The frame chassis 3 is provided with reinforcing bars 32 and 33 in a lattice pattern on the back surface so as to be orthogonal to each side of the display panel 1.
A ventilation hole 34 is formed in the reinforcing bar 32 so as not to penetrate in the vertical direction.
Is provided. In this structure, the air passing from the bottom to the top through the ventilation holes 34 collides with the reinforcing bar 32 to generate convection. As a result, in the cell surrounded by the reinforcing bars 32 and 34, the efficiency of transmitting the heat quantity to the air is improved by the stirring of the air, so that the temperature rise of the display panel can be suppressed.

The ventilation hole 35 of the reinforcing bar 33 has a structure necessary for use in a vertical installation.

[0018]

As described above, according to the image display device of the present invention, the reinforcing bar can prevent the display panel from being damaged due to the bending of the display panel. Since a sufficient air flow rate can be ensured and a rise in the temperature of the display panel can be suppressed, breakage of the display panel does not pose a problem without a cooling fan.

[Brief description of the drawings]

FIG. 1 is a perspective view of a frame chassis in an embodiment of a PDP device of the present invention.

FIG. 2 is a perspective view of a frame chassis in another embodiment of the PDP device of the present invention.

FIG. 3 is a perspective view of a frame chassis in another embodiment of the PDP device of the present invention.

FIG. 4 is a perspective view of a frame chassis in another embodiment of the PDP device of the present invention.

FIG. 5 is a perspective view of a frame chassis in another embodiment of the PDP device of the present invention.

FIG. 6 is a perspective view of a frame chassis in another embodiment of the PDP device of the present invention.

FIG. 7 is a perspective view of a frame chassis in another embodiment of the PDP device of the present invention.

FIG. 8 is an exploded perspective view of a conventional PDP device.

FIG. 9 is a diagram showing a temperature distribution of a display panel.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 display panel 2 double-sided tape 3 frame chassis 4 rear case 5 cooling fan 6 front case 9 heat conductive member 10 case 11 internal unit 12 PDP device 31 fixing bosses 32, 33 reinforcing bars 34, 35 ventilation holes 39 Circuit board 42 Mounting hole 45, 46 Heat radiating hole 63 Light transmitting part 65, 66 Heat radiating hole

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shoichi Irie 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 5C094 AA35 AA36 BA31 DA05 DA12 5G435 AA07 AA12 BB06 EE04 GG42

Claims (9)

[Claims] 1. A video display device in which a rear surface of a display panel and a front surface of a frame chassis are in close contact with each other with a heat conductive member interposed therebetween, wherein a reinforcing bar having ventilation holes is provided on the rear surface of the frame chassis. 2. The image display device according to claim 1, wherein the ventilation holes are provided so as to be dense in a central portion of the display panel and sparse in a peripheral portion. 3. The image display device according to claim 2, wherein the reinforcing bar is thick at a central portion of the display panel and thin at a peripheral portion. 4. The image display device according to claim 2, wherein the reinforcing bar is high at a central portion of the display panel and low at a peripheral portion. 5. The image display device according to claim 1, wherein the ventilation holes are provided so as not to penetrate in a vertical direction. 6. The image display device according to claim 1, wherein the direction of the ventilation holes is the same. 7. The display device according to claim 1, wherein the reinforcing bar is provided in a direction substantially perpendicular to each side of the display panel, and a direction of the ventilation hole is a direction having a predetermined angle that is not perpendicular to each side of the display panel. 6. The video display device according to claim 5, wherein: 8. The display device according to claim 1, wherein the reinforcing bar is provided in a direction having a predetermined angle that is not orthogonal to each side of the display panel, and the direction of the ventilation hole is a direction substantially orthogonal to each side of the display panel. 6. The video display device according to claim 5, wherein: 9. The image display device according to claim 1, wherein all or a part of the ventilation holes is provided through the frame chassis.