JP2003162228A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display device in which the problem is solved that temperature differences are produced in a plasma display panel (PDP) by heat confined in the space between a circuit board and a chassis which are housed in the display device resulting in the deformation of the PDP. <P>SOLUTION: In this display device, heat conductive sheets which are interposed between the chassis and the PDP and extend in the widthwise direction of the PDP are provided at positions opposed to the circuit boards across the chassis. <P>COPYRIGHT: (C)2003,JPO

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 using a plasma display panel.

[0002]

2. Description of the Related Art In a plasma display device, a large amount of heat is generated during light emission (during discharge), so that a display area 51a of a plasma display panel 51 (hereinafter referred to as PDP) shown in FIG. The temperature rises significantly. On the other hand, in the non-display area 51b in the outer peripheral portion of the same PDP 51, since the light emission is not performed, the temperature rise is small. This display area 51a and non-display area 51
A difference in thermal expansion occurs due to the temperature difference from b, and the maximum stress is generated especially at the end of the PDP 51 in the open state.
Deformation had occurred. Further, also in the display area 51a, the temperature difference due to the difference in the brightness in one screen has affected the stress generated at the end of the PDP 51 not a little.

Therefore, P which is the cause of the deformation of the PDP 51
In order to eliminate the temperature difference of DP51, how to soak the whole PDP51 was an important problem.

In order to solve the above-mentioned problems, a plasma display device having the following structure has existed as a conventional technique. FIG. 12 is an exploded perspective view showing a structure of a conventional plasma display device, and FIG. 13 is a sectional view thereof. The PDP 51 on which an image is displayed is composed of a front glass substrate 51c and a rear glass substrate 51d, and the circuit board 5 for displaying the image on the PDP 51.
Reference numeral 2 is divided into respective functional units, and is composed of a drive-related board, a power board, and the like. Here, each circuit board 52 includes a board body 52a and a component group 52b soldered to the board body 52a. Also,
The chassis 53 having a heat dissipation function has P on one main surface side.
The DP 51 is held, and the circuit board 52 is held on the other main surface side. Here, the PDP 51 is fixed to the chassis 53 by using the divided double-sided adhesive tape 54. Here, each circuit board 52 is attached to the chassis 53 between the chassis 53 and the circuit board 52 (the circuit board 5
In order to prevent the heat from the chassis 53 from being directly transmitted to the second unit 2, the air gap 55 is provided.

With the above structure, the PDP 51 is connected through the double-sided adhesive tape 54 (which has higher thermal conductivity than air).
To the chassis 53 (heat from the chassis 53 to the PDP 51
The temperature of the PDP 51 can be equalized and the temperature of the PDP 51 can be equalized.
The heat of the PDP 51 was released to the outside air, and the temperature of the entire PDP 51 was also lowered.

[0006]

However, the substrate main body 52
Since many tall components such as a radiator are used in the component group 52b soldered to a, the circuit board 5
The height of the whole 2 also becomes high. Therefore, it is impossible to make the gap 55 between the circuit board 52 and the chassis 53 too large in order to reduce the thickness required for the plasma display device.

When the void 55 becomes small in this way, ventilation becomes poor, and heat is trapped in the void 55. Further, in addition to the above-mentioned heat buildup, the circuit board 52 itself generates a large amount of heat, so that the temperature of the void 55 further rises. Although the heat of the gap 55 is diffused to some place other than the gap 55, the amount of heat supplied exceeds the amount of diffusion heat, and due to this influence, the temperature difference in the PDP 51 (the place below the gap 55 and other portions) is also increased. The temperature difference between the portions is not eliminated, and the maximum stress is generated at the end portion of the PDP 51, so that the risk of deformation of the PDP 51 is high.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a plasma display device which prevents the PDP from being deformed due to the heat buildup in the void 55.

[0009]

In order to achieve the above-mentioned object, a plasma display device according to the present invention comprises:
A plasma display panel displaying an image, a circuit board necessary for displaying an image on the plasma display panel, one main surface side holding the plasma display panel, and the other main surface side holding the circuit board. And a planar fixing means selectively interposed between the plasma display panel and the chassis and used for fixing the plasma display panel and the chassis, and a thermal conductivity higher than that of the fixing means. A heat conductive sheet selectively interposed between the plasma display panel and the chassis while avoiding the fixing means.

Further, the heat conductive sheet may be located at a position facing the circuit board via the chassis.

Further, the heat conductive sheet may extend in the lateral direction of the plasma display panel, and a long side thereof may be longer than a side of the circuit board in the lateral direction.

Further, the heat conductive sheet may extend from one long side portion of the plasma display panel to the other long side portion thereof.

The fixing means may be arranged on the short side of the plasma display panel.

Further, the housing for accommodating the chassis and the circuit board are formed on a surface of the housing facing the circuit board. Exhaust means for discharging to the outside of the housing, and intake means for corresponding to the circuit board, formed on the surface of the housing facing the circuit board, and supplying air from outside the housing to inside the housing. May be further provided.

Further, the exhaust means is an exhaust hole cut out in the casing at an obliquely upper side of the circuit board, and the intake means is at an oblique lower side of the circuit board.
It may be an intake hole cut out in the housing.

Further, the exhaust means may be an exhaust hole with a fan provided in the casing obliquely above the circuit board.

Further, the intake means may be an intake hole with a fan provided in the casing obliquely below the circuit board.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to the drawings showing the embodiments thereof.

<First Embodiment> FIG. 1 is an exploded perspective view showing a configuration of a plasma display device according to the present embodiment, and FIG. 2 is a sectional view thereof. PDP1
Is composed of a front glass substrate 1a and a rear glass substrate 1b, and displays an image by generating an electric discharge between both glass substrates (1a, 1b). The chassis 2 having a heat dissipation function holds the PDP 1 on one main surface side thereof, and the circuit board 3 (drive related board, power supply board, etc.) necessary for displaying an image on the PDP 1 on the other main surface side. )
And each circuit board holds P at the center of the PDP 1 in the lateral direction (due to the structure of the PDP 1).
They are arranged in the longitudinal direction of DP1. Circuit board 3
Is composed of a board body 3a and a component group 3b soldered to the board body 3a as shown in FIG. 3, and the method of fixing the circuit board 3 to the chassis 2 is as follows. It is fixed with screws 6 via, for example, chassis columns 5 so as to have a gap 4 with the substrate body 3a.

Further, between the PDP 1 and the chassis 2,
A double-sided adhesive tape 7 for fixing the both and a heat conductive sheet 8 having a higher thermal conductivity than the double-sided adhesive tape 7 are interposed. The double-sided adhesive tape 7 and the heat conductive sheet 8 are
Each of them is arranged in the longitudinal direction of the PDP 1 in a divided state, and the heat conductive sheet 8 is arranged in the lateral direction of the PDP 1 (one long side of the plasma display panel) at a position facing the circuit board 3 (with the chassis 2 in between). From one part to the other long side part). Further, the double-sided adhesive tape 7 is similarly extended in the lateral direction at other portions. Here, for example, silicon or the like is used as the heat conductive sheet 8. In addition, the short side of the heat conductive sheet 8 is the circuit board 3
The length may be equal to or slightly longer than the lengthwise side of.

By arranging the heat conductive sheet 8 as in the above structure, the amount of heat conduction is increased at the position where the heat conductive sheet 8 is arranged, and the heat trapped in the space 4 is transferred to the P through the chassis 2.
It is diffused and released in the lateral direction of DP1. Therefore, the temperature of the air gap 4 decreases, and the temperature difference between the portion of the chassis 2 facing the air gap 4 and the other portions decreases, so that the PDP 1
The temperature difference in the inside also becomes small, and the deformation of the PDP 1 can be suppressed.

Further, if heat is trapped in the air gap 4, the temperature difference between the PDP 1 and the chassis 2 becomes small, and the moving speed of heat between them is between the PDP 1 not having the air gap 4 and the chassis 2. Since it is slower than the normal one, it took a long time to soak the PDP 1 too much (if the soaking is too slow, the temperature difference of the PDP 1 is not easily resolved, and there is a risk of deformation of the PDP 1), but heat conduction By introducing the heat-resistant sheet 8, the heat transfer speed between the PDP 1 and the chassis 2 at that location can be increased, the heat can be released from the PDP 1 more quickly, and the time required for soaking the PDP 1 can also be increased. Get faster

Here, in FIG. 1, the heat conductive sheet 8 is P
Although the DP1 is extended from one long side portion to the other long side portion, as shown in FIG. 4, even if the shape is larger than the size of the circuit board 3 in the lateral direction, The same effect can be obtained although it is smaller than in the case of the configuration of FIG. 1 (the longer the length of the heat conductive sheet 8 in the lateral direction, the greater the heat dissipation (heat diffusion) effect). Further, the double-sided adhesive tape 7 is arranged in the region from the short side portion of the heat conductive sheet 8 to the long side portion of the PDP 1.

Further, as shown in FIG. 1 or 4, when the double-sided adhesive tape 7 is used on the short side portion of the PDP 1, the difference in the coefficient of thermal expansion between the PDP 1 and the chassis 2 is a main factor. Generation of a gap between both parts can be suppressed.

<Second Embodiment> FIG. 5 shows a perspective view of a plasma display device according to the present embodiment, and FIG. 6 shows a sectional view thereof. Front case 9, front filter 10
The back cover 11 and the back cover 11 (collectively referred to as a housing) are assembled so as to accommodate the members of the first embodiment from the front and the rear. In the back cover 11, an intake hole 11a and an exhaust hole 11b are provided in a position of the back cover 11 which is diagonally opposite to the circuit board 3 and does not hang on the circuit board 3 itself, and in a position in the lateral direction of the back cover 11. Has been. The intake hole 11a and the exhaust hole 11b are connected to each circuit board 3
In the main surface 1 of the back cover 11 in particular, the exhaust holes 11b are provided on the surface of the back cover 11 respectively.
1c to the skirt portion 11d on the long side of the back cover 11
It is installed over. Here, in the vertical direction when the plasma display device is used, the intake hole 11a
Are provided below the back cover 11 (from the position of the circuit board 3), and the exhaust holes 11b are provided above (from the position of the circuit board 3).

By providing the intake holes 11a and the exhaust holes 11b at the above-mentioned positions of the back cover 11, the high temperature air in the plasma display device rises,
When the plasma display device is used, the air is discharged to the outside of the display device through the exhaust hole 11b, and the air having a low outside air temperature is sent into the display device from the intake hole 11a due to the pressure difference between the inside and outside of the display device. Natural convection 12 shown in FIG. 6 is generated to promote the heat dissipation effect of the void 4, and
Cooling of the component group 3b and the chassis 2 in the circuit board 3 is also effectively performed.

Here, in the present embodiment, the first embodiment
However, even if the back cover 11 having the above-mentioned configuration is used alone without using the heat conductive sheet 8 of the first embodiment, the above-described effect can be expected to some extent.

<Third Embodiment> FIG. 7 shows a perspective view of a plasma display device of the present embodiment, and FIG. 8 shows a sectional view thereof. The front housing 9, the front filter 10, and the back cover 11 (these are collectively referred to as a housing) are assembled so as to accommodate the members of the first embodiment from the front and rear. The back cover 11 includes a circuit board 3
An intake hole 11a and an exhaust hole 11e are provided at a position of the back cover 11 that is not diagonally opposite to the circuit board 3 itself and further in a position in the lateral direction of the back cover 11. The intake hole 11a and the exhaust hole 11e are provided on the main surface 11c of the back cover 11 corresponding to each circuit board 3, and in particular, the exhaust hole 11e is provided with a fan. Here, assuming that the lateral direction of the plasma display device is the vertical direction, the intake hole 11a is provided below the back cover 11 (from the position of the circuit board 3), and the exhaust hole 11e is defined as the (circuit board 3). (From the position) is provided on the upper side.

By providing the exhaust hole 11e with a fan as described above, it is possible to induce a forced convection 13 having a larger air volume than the natural convection 12 in the plasma display device, as shown in FIG. The heat dissipation effect of the air gap 4 is further improved as compared with that of the second embodiment, and the cooling effect in the plasma display device is further improved.

Here, in the present embodiment, the first embodiment
However, even if the back cover 11 having the above-mentioned configuration is used alone without using the heat conductive sheet 8 of the first embodiment, the above-described effect can be expected to some extent.

<Fourth Preferred Embodiment> FIG. 9 shows a perspective view of a plasma display device according to a fourth preferred embodiment of the present invention, and FIG. 10 shows a sectional view thereof. The front housing 9, the front filter 10, and the back cover 11 (these are collectively referred to as a housing) are assembled so as to accommodate the members of the first embodiment from the front and rear. The back cover 11 includes a circuit board 3
An intake hole 11f and an exhaust hole 11b are provided at a position of the back cover 11 that is not diagonally opposite to the circuit board 3 itself and further at a position in the lateral direction of the back cover 11. The intake hole 11f and the exhaust hole 11b are provided on the main surface 11c of the back cover 11 corresponding to each circuit board 3, and in particular, the intake hole 11f is provided with a fan. The structure of the exhaust hole 11b is the same as that of the second embodiment. Here, assuming that the lateral direction of the plasma display device is the vertical direction, the intake hole 11f
Are provided below the back cover 11 (from the position of the circuit board 3), and the exhaust holes 11b are provided above (from the position of the circuit board 3).

By providing the intake hole 11f with a fan as described above, forced convection 13 having a larger air volume than natural convection 12 as shown in FIG. 10 can be caused in the plasma display device. The heat dissipation effect of the air gap 4 can be further improved as compared with that of the second embodiment, and since the air can be blown directly to the chassis 2 and the circuit board 3, the cooling effect is further improved.

Here, in the present embodiment, the first embodiment
However, even if the back cover 11 having the above-mentioned configuration is used alone without using the heat conductive sheet 8 of the first embodiment, the above-described effect can be expected to some extent.

Further, in the present embodiment, the exhaust hole 11b of the second embodiment is adopted, but the exhaust hole 11e with the fan of the third embodiment may be used together.

[0035]

The plasma display device according to the first aspect of the present invention includes a plasma display panel for displaying an image, a circuit board necessary for displaying the image on the plasma display panel, and one main surface side. And a chassis that holds the plasma display panel and holds the circuit board on the other main surface side, and selectively intervenes between the plasma display panel and the chassis, and the plasma display panel and the chassis. And a heat conduction sheet having a higher thermal conductivity than the fixing means and selectively interposed between the plasma display panel and the chassis while avoiding the fixing means. Therefore, by selectively providing the heat conductive sheet at an optimized position (heat diffusion is difficult) Since improved thermal conductivity at the position, heat is diffused along the thermal conductive sheet. Therefore, the temperature difference between the portion where heat is not easily diffused and the other portion is small, and the temperature difference in the plasma display panel is also small, so that the deformation of the plasma display panel can be suppressed. In addition, the heat transfer between the plasma display panel and the chassis becomes faster, so that the time required for soaking is shortened. Further, by disposing the fixing means in a place other than where the heat conductive sheet is provided, the adhesion and the fixing property between the plasma display panel and the chassis are improved.

In the plasma display device according to the second aspect of the present invention, since the heat conductive sheet is located at a position facing the circuit board through the chassis, the heat conductive sheet is provided between the circuit board and the chassis. The accumulated heat can be diffused along the heat conductive sheet.

In the plasma display device according to claim 3 of the present invention, the heat conductive sheet extends in the lateral direction of the plasma display panel, and a long side thereof extends in the lateral direction of the circuit board. Since the shape is longer than the side, heat accumulated between the circuit board and the chassis can be diffused along the lateral direction, and the temperature difference between the place where heat is retained and the place where heat is not retained can be further suppressed. it can.

In the plasma display device according to claim 4 of the present invention, the heat conductive sheet extends from one long side portion of the plasma display panel to the other long side portion thereof. It is possible to diffuse the trapped heat in the wider range of the chassis and minimize the temperature distribution difference in the longitudinal direction of the plasma display panel. Further, since the fixing means and the heat conductive sheet are simply arranged alternately, the process is simplified.

In the plasma display device according to claim 5 of the present invention, since the fixing means is disposed on the short side portion of the plasma display panel,
It is possible to suppress the occurrence of a gap between both components, which is mainly caused by the difference in the coefficient of thermal expansion between the plasma display panel and the chassis.

According to a sixth aspect of the present invention, there is provided a plasma display device in which a housing that houses the chassis and a surface of the housing that faces the circuit board in correspondence with the circuit board. An exhaust unit that is formed on the upper surface of the housing and that discharges heat inside the housing to the outside of the housing; and a surface of the housing that faces the circuit board and that corresponds to the circuit board. Since it further comprises an intake means for supplying air from the outside of the body into the housing, the heat flow can be circulated in the housing, and the heat is diffused to the outside of the housing.

In the plasma display device according to claim 7 of the present invention, the exhaust means is an exhaust hole cut out in the housing obliquely above the circuit board, and the intake means is Since it is an air intake hole cut out in the housing obliquely below the circuit board, high temperature air in the housing rises and is discharged from the exhaust hole to the outside of the housing, and the air is discharged to the housing. Since a difference in atmospheric pressure occurs inside and outside the body, air having a low temperature outside the housing can be supplied from the intake hole into the housing to generate natural convection. Therefore, when using the plasma display device, it is possible to always diffuse the accumulated heat by utilizing this natural convection.

In the plasma display device according to the eighth aspect of the present invention, the exhaust means is an exhaust hole with a fan provided in the casing obliquely above the circuit board, so that the air flow rate is larger than that of the natural convection. It is possible to cause a large amount of forced convection, and more diffuse the heat inside the housing to the outside of the housing.

In the plasma display device according to the ninth aspect of the present invention, the air intake means is a fan-equipped air intake hole provided in the housing obliquely below the circuit board, so that the natural convection is performed. Forced convection with a larger air volume can be caused, and the heat trapped in the housing can be diffused to the outside of the housing. In addition, the wind from the fan can be directly blown to the chassis, and the cooling effect of the chassis and the plasma display panel is further improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a plasma display display device according to a first embodiment.

FIG. 2 is a cross-sectional view of the plasma display display device in the first embodiment.

FIG. 3 is a schematic view showing a method of attaching the circuit board to the chassis.

FIG. 4 is a plan view showing a situation where the heat conductive sheet does not reach the long side portion of the PDP.

FIG. 5 is a perspective view of a plasma display display device according to a second embodiment.

FIG. 6 is a cross-sectional view of the plasma display display device of the second embodiment.

FIG. 7 is a perspective view of a plasma display device having a fan-equipped exhaust hole according to a third embodiment.

FIG. 8 is a sectional view of a plasma display device having a fan-equipped exhaust hole according to a third embodiment.

FIG. 9 is a perspective view of a plasma display display device having a fan-attached air intake hole according to a fourth embodiment.

FIG. 10 is a cross-sectional view of a plasma display display device having a fan-intake hole according to a fourth embodiment.

FIG. 11 is a schematic diagram showing a display area and a non-display area of the PDP.

FIG. 12 is an exploded perspective view of a conventional plasma display device.

FIG. 13 is a sectional view of a conventional plasma display device.

[Explanation of symbols]

1 PDP, 2 chassis, 3 circuit boards, 4 voids,
7 Double-sided adhesive tape, 8 Thermal conductive sheet, 11 Back cover, 11a Intake hole, 11b Exhaust hole, 11e
Exhaust hole with fan, 11f Intake hole with fan, 12
Natural convection, 13 forced convection.

Continued front page    F-term (reference) 5C094 AA31 AA33 AA43 AA48 BA31                       CA19 DA12 FA01 FA02 FB20                       GB01                 5G435 AA12 AA14 BB06 EE02 EE04                       EE13 EE36 GG44

Claims (9)

[Claims] 1. A plasma display panel for displaying an image, a circuit board necessary for displaying the image on the plasma display panel, one main surface side holding the plasma display panel, and the other main surface side for the plasma display panel. A chassis holding a circuit board; a planar fixing means selectively interposed between the plasma display panel and the chassis and used for fixing the plasma display panel and the chassis; and the fixing means. A plasma display device comprising: a thermal conductive sheet having a high thermal conductivity and selectively interposed between the plasma display panel and the chassis to avoid the fixing means. 2. The plasma display device according to claim 1, wherein the heat conductive sheet is located at a position facing the circuit board through the chassis. 3. The heat conductive sheet extends in a lateral direction of the plasma display panel, and long sides thereof are longer than sides of the circuit board in the lateral direction. Item 3. A plasma display device according to item 2. 4. The thermal conductive sheet extends from one long side portion of the plasma display panel to the other long side portion thereof, according to any one of claims 1 to 3. The plasma display device according to. 5. The plasma display display device according to claim 1, wherein the fixing means is disposed on a short side portion of the plasma display panel. 6. A housing containing the chassis and a surface of the housing corresponding to the circuit board, the surface of the housing facing the circuit board. Exhaust means for discharging to the outside of the housing, and intake means for corresponding to the circuit board, formed on the surface of the housing facing the circuit board, and for supplying air from outside the housing to inside the housing. 6. The plasma display device according to claim 1, further comprising: 7. The exhaust means is an exhaust hole cut out in the housing at an obliquely upper side of the circuit board, and the intake means is cut out in the housing at an obliquely lower side of the circuit board. 7. The plasma display device according to claim 6, wherein the plasma display device is an air intake hole. 8. The plasma display device as claimed in claim 6, wherein the exhaust means is an exhaust hole with a fan provided in the housing obliquely above the circuit board. 9. The air intake unit is a fan-equipped air intake hole provided in the housing obliquely below the circuit board. Plasma display device.