JP3118907B2 - Plasma display panel cooling device - 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 cooling apparatus, and more particularly to a plasma display panel cooling apparatus integrated with a plasma display panel and capable of improving the contrast of the plasma display panel.

[0002]

2. Description of the Related Art A conventional cooling device for a plasma display panel is not used at all, or an air cooling method in which air is directly blown on the panel by a cooling fan is used.

[0003]

When a plasma display panel is colored, the luminous efficiency is low at the present stage and almost all of the energy consumed by the panel becomes heat. The panel gets hot. Therefore, a cooling device for the plasma display panel is required.

[0004] In the conventional plasma display panel, no cooling device was used at all, or as shown in FIG.
In most cases, the cooling fan 10 is integrated and mainly intended to cool a driving circuit (not shown) of the plasma display panel.

[0005] Therefore, there is a problem that cooling is performed mainly from the back side of the plasma display panel, and the substrate on the display surface side cannot be cooled. This is a problem particularly in the case of a type in which most of the display discharge is obtained on the substrate on the display surface side, such as an AC surface discharge reflection type plasma display panel.

[0006]

According to the present invention, there is provided a cooling apparatus for a plasma display panel, which is directly attached to the plasma display panel at an appropriate interval to form an airtight container with the plasma display panel. And a refrigerant flowing into or out of or sealed in the airtight container.

Furthermore, another cooling device for a plasma display panel according to the present invention has a front plate directly attached to the plasma display panel at an appropriate interval, and a fan for ventilating the interval. .

[0008]

In the cooling device for a plasma display panel according to the present invention, it is possible to freely cool both the display surface side and the rear surface side of the panel by using a material having visible light transmittance for the container forming the airtight container and the refrigerant. Become.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG.
1 is a longitudinal sectional view of Embodiment 1 of a cooling device for a plasma display panel according to the present invention.

A plasma display panel 1 in which two glass substrates on which electrodes are formed is sealed at an interval required for electric discharge, and a dischargeable rare gas is sealed in the glass display panel 1. It is combined with a front plate 3 having a sufficient visible light transmissivity by sandwiching a sealing material 2 also serving as a spacer around the periphery so as to form an airtight container with the display surface. In the upper part of the plasma display panel 1,
The metal plate 4 is arranged and fixed on the front plate 3 to the extent that it does not hinder the display of the plasma display panel 1 by penetrating between the front plate 3 and the sealing material 2. A heat sink 5 is arranged on a portion of the metal plate 4 that is formed between the front plate 3 and the display surface of the plasma display panel 1 and that comes out of the airtight container. A cooling liquid 6 colored with a black pigment is sealed in an airtight container formed between the front panel 3 and the display surface of the plasma display panel 1 so that the visible light transmittance is about 50%.

Here, the plasma display panel has A
C-surface discharge reflection type color type, sealing material 2 is 10 mm thick rubber packing material, front plate 3 is 2 t
The soda glass plate, the metal plate 4 and the heat sink 5 were made by integrally processing aluminum, and the cooling liquid 6 was made of ethylene glycol.

When the plasma display panel with the cooling device is operated, the temperature of the panel increases mainly due to Joule heat. Then, the coolant 6 warms and convection occurs inside the airtight container formed between the front panel 3 and the display surface of the plasma display panel 1. As a result, the heat of the plasma display panel 1 is transferred to the metal plate 4 via the cooling liquid 6, and the heat is released from the heat sink 5 to the outside air, thereby cooling the panel. While the surface temperature of the panel panel of the plasma display without the cooling device was about 60 ° C. at the maximum, the temperature of the display surface of the plasma display panel with the cooling device of the present embodiment was suppressed to about 40 ° C. at the maximum. Was done.

In contrast, the contrast of a plasma display panel having an exposed display surface is about 15: 1 at an ambient luminance of 100 lx, whereas in the plasma display panel with a cooling device of the present invention, the cooling liquid is colored black. As a result, reflection of external light was suppressed, and a high contrast of about 30: 1 was obtained.

FIG. 2 shows that an airtight container is formed between the display panel and the display surface of the plasma display panel 1 according to the present invention.
The front plate 3 and the plasma display panel 1 having sufficient visible light transmittance are combined with a sealing member 2 also serving as a spacer interposed therebetween. The convection pipe 7 connects the upper part and the lower part of the inside of the airtight container formed between the front panel 3 and the display surface of the plasma display panel 1, and forms the convection pipe 7.
The heat sink 5 is formed in the middle of the process. A cooling liquid 6 colored with a black pigment so that the visible light transmittance is about 50% is applied to an airtight container formed between the front panel 3 and the display surface of the plasma display panel 1 and the convection tube 7. Encapsulate.

Here, the plasma display panel has A
C-surface discharge reflection type color type, sealing material 2 is 10 mm thick rubber packing material, front plate 3 is 2 t
A soda glass plate, an aluminum tube having an inner diameter of φ6 was used for the convection tube 7, an aluminum plate was used for the heat sink 5, and ethylene glycol was used for the cooling liquid 6, respectively.

When the plasma display panel with the cooling device is operated, the temperature of the panel increases mainly due to Joule heat. Then, the coolant 6 warms and convection occurs inside the hermetic container and inside the convection tube formed between the front panel 3 and the display surface of the plasma display panel 1. As a result, the heat of the plasma display panel 1 is transferred to the cooling liquid 6, and is cooled by convection from the convection tube to heat.
While the surface temperature of the plasma display panel without the cooling device was about 60 ° C. at the maximum, the temperature of the display surface of the plasma display panel with the cooling device of the present example was suppressed to about 40 ° C. at the maximum. .

The contrast of a plasma display panel with a bare display surface is about 15: 1 at an ambient illuminance of 10 lx, whereas the cooling liquid is colored black in the plasma display panel with a cooling device of the present invention. Therefore, reflection of external light was suppressed, and a high contrast of about 30: 1 was obtained.

FIG. 3 is a longitudinal sectional view of a cooling apparatus for a plasma display panel according to a third embodiment of the present invention.

As in the first embodiment, a front plate having a sufficient visible light transmittance is sandwiched by a sealing material 2 serving as a spacer around the periphery so as to form an airtight container with the display surface of the plasma display panel 1. 3 and the plasma display panel 1 are combined. The convection pipe 7 connects the upper part and the lower part of the inside of the airtight container formed between the front panel 3 and the display surface of the plasma display panel 1, and the heat sink 5 and the forced circulation fan are provided in the convection pipe 7. 8 is formed.
The forced circulation fan 8 includes a temperature detecting device such as a thermostat for detecting the temperature of the plasma display panel 1, and an external power supply for driving the fan (may be shared with a plasma display panel driving circuit) (not shown). ). A cooling liquid 6 colored with a black pigment so as to have a visible light transmittance of about 50% is provided inside an airtight container and a convection tube 7 formed between the front panel 3 and the display surface of the plasma display panel 1. Encapsulate.

Here, the plasma display panel has A
C-surface discharge reflection type color type, sealing material 2 is 10 mm thick rubber packing material, front plate 3 is 2 t
A soda glass plate, an aluminum tube having an inner diameter of φ6 was used for the convection tube 7, an aluminum plate was used for the heat sink 5, and ethylene glycol was used for the cooling liquid 6, respectively.

When the plasma display panel with the cooling device is operated, the temperature of the panel increases mainly due to Joule heat. When the temperature exceeds the set temperature of the thermostat, the forced circulating fan 8 operates to supply the cooling liquid 6 to the inside of the airtight container formed between the front panel 3 and the display surface of the plasma display panel 1 and the inside of the convection tube. And thereby the heat of the plasma display panel 1 is released from the heat sink 5 to the outside air, thereby cooling the panel. While the panel surface temperature of the plasma display without the cooling device was around 60 ° C. at the maximum, the temperature of the display surface of the plasma display panel with the cooling device of the present embodiment was suppressed to about 40 ° C. at the maximum. Was.

In contrast, the contrast of a plasma display panel having a bare display surface is about 15: 1 at an ambient luminance of 100 lx, whereas the front panel 3 is colored black in the plasma display panel with a cooling device of the present invention. , The reflection of external light is suppressed, and 30: 1
High contrast before and after was obtained.

In the above three embodiments, the front plate 3
Is colored so that the visible light transmittance is about 50%, and the same effect can be obtained even when the cooling liquid 6 is transparent.

In the above embodiments, the heat sink is naturally cooled. However, it is needless to say that the heat sink may be cooled by forced air cooling or liquid cooling.

FIG. 4 is a longitudinal sectional view of a cooling device for a plasma display panel according to a fourth embodiment of the present invention.

The two glass substrates on which the electrodes are formed are sealed while maintaining a sense required for discharge, and a plasma display panel 1 in which a dischargeable rare gas is sealed inside is provided. A front panel 3 and a plasma display, which are colored so as to have a visible light transmittance of about 50%, with a spacer 2 interposed therebetween so that air can freely enter and exit while maintaining an appropriate distance from the display surface. Combine with Panel 1. A blower tube 9 is connected so that outside air can be sent through the spacer at the lower portion of the plasma display panel 1 to the space between the plasma display panel 1 and the front plate 3, and a blower fan 10 is connected to an end opposite to the blower tube 9. Attach. The blower fan 10 includes a temperature detection device such as a thermostat for detecting the temperature of the plasma display panel 1 and an external power supply (not shown) for driving the fan (may be shared with a plasma display panel drive circuit). .

Here, the plasma display panel has A
The C-surface discharge reflection type color type was used, the spacer 2 was made of rubber having a thickness of 10 mm, and the front plate 3 was made of an acrylic plate.

When the plasma display panel with the cooling device is operated, the temperature of the panel increases mainly due to Joule heat. When the temperature exceeds the set temperature of the thermostat, the blower fan 10 operates and the outside air passes through the blower tube 9,
It is fed into the space between the plasma display panel 1 and the front plate 3. As a result, the heat of the plasma display panel 1 is released to the outside air to cool the panel.
While the surface temperature of the panel of the plasma display without the cooling device was about 60 ° C. at the maximum, the temperature of the display surface of the plasma display panel with the cooling device of the present embodiment was suppressed to about 35 ° C. at the maximum. Was done.

The contrast of the plasma display panel with the exposed display surface is about 15: 1 at an ambient illuminance of 100 lx, whereas the front panel 3 is colored black in the plasma display panel with the cooling device of the present invention. As a result, reflection of external light was suppressed, and a high contrast of about 30: 1 was obtained.

FIG. 5 is a longitudinal sectional view of Embodiment 5 of the cooling device for a plasma display panel according to the present invention.

The plasma display panel 1 is combined with a housing 11 in which a front plate 3 is integrated so as to keep an appropriate distance from the display surface of the plasma display panel 1. Here, the front plate 3 is colored so that the visible light transmittance is about 50%. A gap is provided below the plasma display panel 1 and the housing 11, and the housing 1
1 and a blower fan 10 arranged at the rear of
1 can be sent into the space between the plasma display panel 1 and the front panel 3. In addition, a slit is opened in the rear part of the blower fan 10 of the housing 11 so that outside air can be taken in. The blower fan 10 includes a temperature detection device such as a thermostat for detecting the temperature of the plasma display panel 1 and an external power supply (not shown) for driving the fan (may be shared with a plasma display panel drive circuit). .

Here, the plasma display panel has A
The C-surface discharge reflection type color type was used, and the front plate 3 was an acrylic plate.

When the plasma display panel with the cooling device is operated, the temperature of the panel increases mainly due to Joule heat. When the temperature exceeds the set temperature of the thermostat, the blower fan 10 operates and the outside air passes through the housing 11,
It is fed into the space between the plasma display panel 1 and the front plate 3. As a result, the heat of the plasma display panel 1 is released to the outside air to cool the panel.
While the panel surface temperature of the plasma display without the cooling device was around 60 ° C. at the maximum, the temperature of the display surface of the plasma display panel with the cooling device of the present embodiment was suppressed to a maximum of approximately 35 ° C. Was.

The contrast of a plasma display panel having a bare display surface is about 15: 1 at an ambient illuminance of 100 lx, whereas the front panel 3 is colored black in the plasma display panel with a cooling device of the present invention. , The reflection of external light is suppressed, and 30: 1
High contrast before and after was obtained.

Further, the fifth embodiment is characterized in that it is possible to simultaneously cool the plasma display panel drive circuit.

[0036]

As described above, the cooling device for a plasma display panel according to the present invention is directly attached to the plasma display panel at an appropriate interval to form an airtight container between the plasma display panel and the plasma display panel. A structure having a refrigerant flowing into or out of or sealed in the airtight container, or a structure having a front plate directly attached to a plasma display panel at an appropriate interval and a fan ventilating the interval. Therefore, by using a container and a refrigerant forming the airtight container, or a material having light transmittance for the front panel, it is possible to cool the plasma display panel freely and effectively on both the display surface side and the rear side. It became.

A part of a container forming an airtight container with the plasma display panel, or a refrigerant flowing into or out of or sealed in the airtight container, or before being directly attached to the plasma display panel at an appropriate interval. By coloring the face plate, it became possible to obtain a plasma display panel with extremely good contrast.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a fourth embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a fifth embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a conventional cooling device for a plasma display panel.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 plasma display panel 2 sealing material 3 front plate 4 metal plate 5 heat sink 6 after cooling 7 convection tube 8 forced circulation fan 9 blower tube 10 blower fan 11 housing

Claims (5)

(57) [Claims] 1. A plasma having a front plate directly attached to a plasma display panel at an appropriate interval and forming an airtight container with the plasma display panel, and a refrigerant flowing into or out of or sealed in the airtight container. A cooling device for a display panel, wherein the hermetic container is formed on a display surface side of a plasma display panel, and a part or all of the container forming the hermetic container and the refrigerant have visible light transmittance, and The cooling device for a plasma display panel, wherein the refrigerant is colored. 2. A plasma, which is directly attached to a plasma display panel at an appropriate interval and forms a hermetic container with the plasma display panel, and a refrigerant having a refrigerant flowing into or out of or sealed in the hermetic container. A cooling device for a display panel, wherein the hermetic container is formed on the display surface side of a plasma display panel, and a part or all of the container forming the hermetic container and the refrigerant have visible light transmittance, A cooling device for a plasma display panel, wherein a portion having visible light transmittance of a container forming the airtight container is colored. 3. A cooling device for a plasma display panel, comprising: a front panel directly attached to a plasma display panel at an appropriate interval; and a fan for ventilating the interval. A cooling device for a plasma display panel, wherein the cooling device is formed on the display side of (1), wherein the front plate has visible light transmittance and is colored. 4. A cooling device for a plasma display panel, comprising: a front plate directly attached to a plasma display panel at an appropriate interval; and a fan for ventilating the interval. The cooling device for a plasma display panel is formed on the display side of (1), wherein the front plate has a visible light transmitting property and is subjected to a process for suppressing reflection of external light. 5. A cooling device for a plasma display panel, comprising: a front plate formed at an appropriate interval in a plasma display panel; and a fan for ventilating the interval. A cooling device for a plasma display panel, which is formed on a display side, wherein the front panel has visible light transmittance and is colored.