JP3503349B2 - Plasma display panel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel provided with means for efficiently dissipating heat generated in a display panel for displaying characters and images using gas discharge.

[0002]

2. Description of the Related Art In recent years, a plasma display panel ( hereinafter referred to as PDP) which is a gas discharge type display device has been used as a flat display device for an information terminal device such as a portable computer, and has a clear display. The field of application is expanding due to the wide display and wide viewing angle.

In the PDP, the higher the display brightness, the more
A large amount of heat is generated, the temperature of the display panel portion becomes high, and the display quality characteristics of the display panel deteriorate. Further, it is not preferable to operate the display panel at a high temperature for a long time in view of performance and characteristics of the display panel. For example, it becomes a cause of lowering the reliability of the driver circuit for driving the display panel. Further, if a state in which there is a large temperature difference in the plane of the display panel continues for a long time, the glass constituting the display panel is distorted, and the glass is damaged.

Therefore, in order to lower the temperature of the display panel during operation and to reduce the distortion of the glass that causes the glass to be broken, the temperature difference in the plane of the display panel is reduced,
It is necessary to improve the performance and quality of the entire PDP.

As a measure against this, in the conventional PDP, as shown in FIG.
As shown in the exploded perspective views and cross-sectional views of (a) and (b), a ventilation fan 22 and a spacer 23 are provided on the back surface of the display panel 21.
The temperature of the display panel 21 was lowered by applying the wind to the display panel 21 through the.

[0006]

When the display panel surface is installed parallel to the vertical direction and turned on, the temperature distribution in the surface of the display panel 21 becomes as shown in FIG. 4 due to natural convection of heat. The difference in temperature between the high temperature portion and the low temperature portion is a dozen degrees. Further, the temperature difference in the panel surface also becomes large depending on the image pattern displayed on the panel. For example, as shown in FIG. 5, when a part of a bright image (bright display) continues on a dark background (dark display) for a long time, the temperature difference between the bright area and the dark area around it becomes considerably large. If such a state continues for a long time, the glass forming the display panel 21 is distorted and the display panel 21 is likely to be damaged. In particular, if a temperature difference of 20 ° C. or more occurs in the plane of the display panel 21, the display panel 21 is likely to be damaged.

In the conventional PDP provided with the ventilation fan 22, the temperature of the display panel 21 can be lowered, but there is a problem that it is difficult to reduce the temperature difference within the plane of the display panel 21. Further, the noise of the motor of the ventilation fan 22 is annoying, and electric power for driving the motor of the ventilation fan 22 is required.
However, there is a problem in that the space for installing the motor is required and the entire PDP becomes large.

The present invention has been made to solve the above-mentioned problems. Even when the panel brightness of a PDP is increased, the temperature of the display panel can be kept low by a simple structure, and the temperature difference within the panel can be reduced. The size of the PDP is reduced to provide a high display quality.

[0009]

The PDP of the present invention is
During the construction the display panel and the heat radiating plate in the scan, but provided to substantially close contact with the heat conductive sheet having elasticity and the heat radiating plate and the display panel. Further, the first heat conductive sheet, wherein the heat conductive sheet is a high heat conductive sheet.
And a second heat conductive sheet having elasticity .

With this configuration, the heat in the display panel surface during operation is conducted to the heat dissipation plate through the heat conductive sheet to dissipate the heat into the air, thereby lowering the temperature in the display panel surface and The temperature difference in the display panel surface can be reduced. Further, it is possible to absorb the warp between the display panel and the heat dissipation plate to improve the adhesion between the heat conductive sheet and the display panel and the heat dissipation plate, and to reduce the impact from the outside.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIGS. 1 (a) and 1 (b) show a P in Embodiment 1 of the present invention.
FIG. 3 is an exploded perspective view (a) and a sectional view (b) showing DP , in which a display panel 1 includes a heat conductive sheet 2 and a heat radiating plate 3. The protrusions 4 of the heat dissipation plate 3 are for efficient heat dissipation. The heat conductive sheet 2 reduces the in-plane temperature difference of the display panel 1, more efficiently transfers the heat of the display panel 1 to the heat dissipation plate 3, and causes the heat dissipation plate 3 to radiate the heat into the air to reduce the temperature of the display panel 1. It works to reduce the amount. Further, the heat conductive sheet 2 has an effect as a cushioning material by using a gel-like soft material, and has an effect of protecting the display panel 1 from an external impact.

In this embodiment, a 26-inch type display panel is used, and the entire back surface of the display panel has a thickness of 1 mm to
A heat conductive sheet 2 made of a 5 mm gel silicon sheet and a heat dissipation plate 3 made of aluminum are sequentially attached,
White display was performed on the entire display panel with a power of 120 W.
In this case, the temperature of the display panel was lowered by about 25 ° C. as compared with the case where nothing was attached. As the heat conductive sheet 2, a heat conductive sheet such as a rubber sheet can be used in addition to the silicon sheet.

(Embodiment 2) Since the display panel 1 and the heat sink 3 have some warpage,
It is preferable that the heat conductive sheet 2 has high flexibility in order to bring the both into close contact with the heat conductive sheet 2 to improve the heat conductivity and to protect the display panel 1 from an external impact. Further, in order to reduce the temperature difference in the panel surface and enhance the effect of lowering the temperature of the panel, the thermal conductivity of the thermal conductive sheet 2 is preferably high. However, when a material having high thermal conductivity is used as the heat conductive sheet 2, the elasticity and flexibility of the heat conductive sheet 2 become poor because the metal component in the material is high. Therefore,
As shown in the cross-sectional view of FIG. 2, the heat conductive sheet 2 and the high heat conductive sheet (first heat conductive sheet) 6 such as a metal sheet or a carbon sheet having a high heat conductivity are rich in flexibility. Standard thermal conductive sheet such as gel-like silicon sheet (second
And a heat conductive sheet 7). The high thermal conductive sheet 6 is made thin by 0.1 to 0.5 mm so as to have flexibility. The temperature difference in the display panel surface due to the heat generated in the display panel 1 is reduced by the high thermal conductivity sheet 6. The heat transmitted to the high thermal conductive sheet 6 is efficiently transferred to the heat sink 3 by the standard thermal conductive sheet 7.
And is radiated into the air from the heat radiating plate 3. Also,
Since the heat conductive sheet 2 is elastic, vibrations and shocks from the outside are relieved and transmitted to the display panel 1 to enhance the effect of preventing panel damage and enhance the adhesion between the display panel 1 and the heat dissipation plate 3. The efficiency of heat conduction has increased.

In this embodiment, as the high thermal conductive sheet 6, a high thermal conductive carbon sheet having high thermal conductivity (thermal conductivity is 800 to 1000 W / m ° C., thickness is 0.1 to 0.5 m).
m) as a standard heat conductive sheet 7 is a gel-like silicon sheet (heat conductivity is 1 to 5 W / m ° C., thickness is 1 to 5 m).
m) was used to perform pattern display such as central bright display and peripheral dark display as shown in FIG. At that time, the temperature distribution on the central XX line (see FIG. 5) of the display panel has a characteristic as shown by the solid line 8 in the characteristic diagram of FIG. A broken line 9 in FIG. 6 shows the temperature distribution on the central XX line (see FIG. 5) of the display panel when the pattern display as shown in FIG. 5 is performed in the PDP according to the first embodiment. . As shown in FIG. 6, as compared with the characteristics of the display panel in the first embodiment (broken line 9), the characteristics of the display panel in this embodiment (solid line 8) show that the heat in the display panel surface is from the central portion to the end portion. And the temperature difference within the display panel was significantly reduced. This is because the high thermal conductivity carbon sheet has a high thermal conductivity of 800 to 1000 W / in the direction of the sheet surface.
This is due to having m ° C. Further, the high thermal conductivity carbon sheet has lower thermal conductivity in the thickness direction than in the sheet surface direction, but by making it thin as described above, heat is efficiently transmitted in the thickness direction.

In the first embodiment and the present embodiment,
According to FIG. 6, the temperature difference in the surface of the display panel is smaller than 20 ° C., and the damage of the display panel can be avoided.

As the high heat conductive sheet 6, copper foil, aluminum foil or the like can be used in addition to the high heat conductive carbon sheet. As the standard heat conductive sheet 7, a rubber sheet or the like can be used in addition to the silicon sheet.

[0017]

According to the present invention as described above, according to the present invention, moth
There is elasticity between the display panel composed of lath and the heat sink.
By forming the heat conductive sheet which not only lowers the temperature of the display panel in operation, to reduce the temperature difference of the display panel plane, as it can provide a highly reliable display device is there. Furthermore, since a ventilation fan is not used unlike the conventional case, there is no noise in the motor, and electric power for driving the motor and a space for mounting the motor are unnecessary.

[Brief description of drawings]

FIG. 1A is a plasma according to the first embodiment of the present invention.
Exploded perspective view of the display panel (b) Same sectional view

FIG. 2 is a plasma display according to a second embodiment of the present invention.
Cross section of play panel

FIG. 3A is an exploded perspective view of a conventional plasma display panel , and FIG.

FIG. 4 is a schematic diagram of temperature distribution in a display panel surface due to natural convection of heat.

FIG. 5 is a display surface view showing a display pattern.

FIG. 6 is a temperature distribution characteristic diagram of the display panel of the present invention.

[Explanation of symbols]

1 Display panel 2 Thermal conductive sheet 3 heat sink 4 protrusions 6 First heat conductive sheet (high heat conductive sheet) 7 Second thermal conductive sheet (standard thermal conductive sheet)

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Claims (2)

(57) [Claims] Between 1. A display panel constituted by a glass radiating plate, provided with a thermally conductive sheet having elasticity so as to be substantially close contact with said heat radiating plate and the display panel Purazumade
Display panel . 2. The heat conductive sheet is a high heat conductive sheet.
A first heat conductive sheet and a second heat transfer having elasticity
The plastic according to claim 1, which has a conductive sheet.
Zuma display panel .