JPH10222076A - Plasma display - Google Patents

Abstract

(57) Abstract: The present invention relates to a plasma display device, and, in a state where a device housing is formed in a sealed structure to prevent foreign matter such as dust from entering the inside from outside, heat generated inside the sealed housing is prevented. To efficiently dissipate heat to the outside. SOLUTION: A plasma display panel (P) is provided on the front side.
DP) In a plasma display device in which a heating active element 2a for drive control is arranged in a device housing 11 supporting a DP1 by a frame 3, the device housing 11 has a sealed configuration in which the front surface is closed by a PDP 1. And penetrates the inside of the closed casing 11 in, for example, the up-down direction, and the upper and lower openings
12a and 12b are provided with a circulation duct 12 having good conductivity of a cooling medium opened outside the closed casing 11, and the distribution duct 12 heated by heat generated in the closed casing 11 flows through the duct. The cooling is performed by radiating heat by the air (cooling medium).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly to a structure for effectively eliminating a rise in temperature inside the device due to heat generated in a plasma display panel and a display drive circuit.

2. Description of the Related Art In a plasma display device, the depth of a plasma display panel (hereinafter abbreviated as PDP) used as a display unit is thinner and a larger screen can be easily formed as compared with a cathode ray tube (cathode ray tube) having the same screen size. It is excellent in terms of display brightness and contrast, and in recent years, is expected to be used as a wall-mounted television or a large-sized public display device along with color display.

However, a PDP used in such a display device uses a plasma discharge phenomenon for display light emission, and thus generates considerably more heat and electromagnetic radiation than a CRT or a liquid crystal display panel. . This electromagnetic radiation is prevented by metalizing the housing housing these electromagnetic radiation generating sources, or by applying a metal coating to the inner surface or the like when the housing is made of plastic and performing grounding treatment or the like. However, as for the heat generation, since the heat generation inside the housing is determined by the internal structure, how to efficiently remove the heat generation to the outside has been a major problem in order not to lower the display characteristics.

Accordingly, there is a device configuration in which heat generated inside the device housing is efficiently discharged, and the external dust is discharged to the outside so as not to be taken into the housing, thereby preventing a deterioration in display characteristics due to a rise in temperature of the PDP itself. Requested.

[0005]

2. Description of the Related Art As a conventional general plasma display device, as shown in a schematic exploded perspective view of FIG. 6, for example, a PDP (plasma display panel) 1 for displaying characters and images by plasma discharge, and an image display signal. Processing, PD
Various active elements (signal processing IC, high voltage driving IC, etc.) for controlling the necessary high voltage driving pulse for P1
And a drive control circuit board 2 on which passive elements (elements such as resistors, capacitors, and inductances) are mounted, and a PDP
And a frame 3 made of a metal such as aluminum or an aluminum alloy, which serves as a skeleton for fixing and holding the drive control circuit board 1 and the drive control circuit board 2 in an apparatus casing to be described later.
Frame that is supported by the PDP 1 and the drive control circuit board 2 and that is shielded so as to prevent unnecessary electromagnetic wave radiation generated inside the apparatus by applying metal plating to the inner surface of, for example, metal or plastic. And a device housing composed of a front housing 4a and a rear housing 4b.

[0006] These plasma display devices are, for example, shown in FIG.
As shown in the sectional side view of the main part, the PDP 1 and the drive control circuit board 2 are combined and fixed to the frame 3 by a mounting tool 5, a double-sided adhesive material and screws, and the combined PDP 1 is a device housing. (Hereinafter referred to as a housing) 4
Is fixed in the front housing part 4a, and the rear part is covered by the rear housing part 4b.

In such a plasma display device,
The PDP 1 and the drive control circuit board 2 at the time of display by plasma discharge are a kind of heat source, and the heat generation amounts of both are substantially equal, and 25% of the heat generation is radiated from the display surface, but the remaining 75 % Is trapped inside the housing 4 and causes a rise in the temperature of the PDP 1 and the drive control circuit board 2, which lowers the display characteristics due to the rise in the temperature.
In addition to shortening the life of the drive 1, the drive control circuit may be overheated and damaged,
The heat generated inside the housing 4 is forcibly released to the outside by a heat radiating fan 6 provided in the rear housing portion 4b of the housing 4.

[0008]

In the conventional plasma display device as described above, the heat generated in the housing 4 is forcibly released to the outside by the radiating fan 6, so that the external device is not used. It is inevitable that unnecessary things, such as dust, as well as the cold outside air flowing into the housing 4 from entering the housing 4 enter.

Some of the unnecessarily invaded dust is PD
It adheres to the terminal portion of P1 and various active elements and passive elements on the drive control circuit board 2 and is deposited with the passage of time, which causes a problem of poor insulation or, in the worst case, ignition. Such a problem is particularly serious for a device having a high-voltage circuit that handles a voltage of up to 300 V, and how to prevent a temperature rise in the housing 4 and how to prevent dust from entering the inside of the housing 4. This is a major problem in putting the plasma display device to practical use.

Although unnecessary radiation of electromagnetic waves such as high-voltage switching noise generated inside the housing 4 is prevented by the shield structure of the housing 4 as described above, more strictly, V is leaked to the outside through a clearance space such as a heat radiation intake port or exhaust port provided on the body itself.
It is difficult to sufficiently satisfy the CCI (Voluntary Control Council for Interference by Information Processing Equipment) standard, and there is a problem that the environment is deteriorated due to unnecessary electromagnetic radiation.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention has a sealed structure in which a housing itself has a sealed structure which completely prevents foreign matter such as dust from entering from outside and radiation of unnecessary electromagnetic waves to the outside. It is an object of the present invention to provide a novel plasma display device capable of efficiently radiating heat generated in the closed casing to the outside by means for releasing internal heat to the outside without damaging the closed structure of the plasma display apparatus. is there.

[0012]

In order to achieve the above object, the present invention provides a plasma display device having a driving active heating element disposed in a housing supporting a plasma display panel on a front surface thereof. The housing has a sealed configuration in which the front surface is closed by the plasma display panel, and has a structure in which a cooling medium distribution duct penetrating therethrough is provided in the sealed housing.

According to this structure, a cooling medium such as air that is relatively cool flows into the circulation duct from the lower opening, flows through the inside, and flows out of the upper opening.
Since the distribution duct heated by the generated heat in the closed casing is cooled, the temperature in the closed casing can be easily reduced without intrusion of dust from the outside,
It is possible to effectively prevent a rise in temperature of the plasma display panel and the drive control circuit board.

In this case, the distribution duct is formed of a member having good heat conductivity such as metal or metal-coated plastic, and is naturally cooled by air. Efficient cooling can be realized, and the noise environment due to the radiation fan can be eliminated.

Accordingly, it is possible to prevent a decrease in display characteristics (brightness and the like) due to a rise in the temperature of the plasma display panel, a deterioration in life due to thermal distortion and the like, and a damage due to overheating of the drive control circuit.

In addition, as the above-mentioned distribution duct, for example, in addition to the case where only the vertical distribution duct penetrating vertically through the inside of the closed casing, a vertical distribution duct and the vertical distribution duct are provided. A horizontal distribution duct communicating with an intermediate portion of the duct, and a configuration in which a blower fan is provided in the horizontal distribution duct, or a radiation fin is provided on at least one of the inner or outer wall surfaces of the distribution duct. Configuration.

Further, by making the distribution duct and the plasma display panel and the drive control circuit board contact with each other via a heat conductive material, the temperature rise due to the heat generated in the closed casing can be extremely efficiently. Since the temperature can be reduced, it is possible to effectively prevent the temperature of the plasma display panel and the drive control circuit board from rising.

The closed casing and each distribution duct are
Since the electromagnetic wave shield is formed by a member such as metal or plastic having a metal coat applied to the inner surface or the like, it is possible to completely prevent unnecessary electromagnetic waves generated inside from radiating to the outside.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional side view of a main part showing a first embodiment of the plasma display device of the present invention, and portions having the same functions as in FIG. 7 are denoted by the same reference numerals.

In this embodiment, as shown in the figure, the PDP (plasma display panel) 1 and the drive control circuit board 2 are connected to a metal frame 3 made of, for example, aluminum, aluminum alloy or the like by means of a mounting tool 5, double-sided adhesive and screws.
Fixed and combined PDP
Reference numeral 1 denotes a front surface of a front housing portion 11a of a plastic housing 11 made of, for example, a metal or a metal coating such as a metal plating on an inner surface to prevent radiation of unnecessary electromagnetic waves generated inside. The frame unit is fixed in a hermetically closed configuration with its front surface closed, and the rear portion is covered by a rear housing portion 11b to form an airtight device housing, that is, a closed housing 11.

In the space inside the closed casing 11, for example, a cooling medium distribution duct 12 penetrating as shown in the figure is provided with a lower opening 12a and an upper opening 12b.
It is provided so as to open to the outside. The cooling medium distribution duct 12 is hollow, for example, aluminum,
Made of metal such as copper, copper alloy, or plastic with good thermal conductivity coated with aluminum on the inner and outer surfaces,
Inside, a cooling medium made of air or the like can flow independently of the inside of the closed casing 11.

With the structure of this embodiment, even if the temperature inside the sealed housing 11 rises due to the heat generated from the PDP 1 and the drive control circuit board 2 during display by plasma discharge, the space inside the sealed housing 11 is increased. The distribution duct 12 penetrated through the duct 12 is heated, and the air in the distribution duct 12 is also warmed, flows upward as an ascending airflow, and flows out from the upper opening 12b.

On the other hand, along with this, relatively cool air (cooling medium) from the outside flows into the inside through the opening 12a below the flow duct 12, and is generated in the closed casing 11 by this air flow action. Since the circulation duct 12 heated by the heated hot air is cooled, the temperature in the closed casing 11 can be easily reduced without intrusion of dust from the outside.

Therefore, the PDP 1 and the drive control circuit board 2
Temperature rise can be effectively prevented. Further, in such a device configuration, about half of the amount of heat generated is generated from the drive control circuit board 2, and among various elements mounted on the drive control circuit board 2, heat generated by, for example, an FET, which generates particularly large heat, is generated. When there is an active element 2a or the like, the distribution duct 12 is provided in the vicinity of the drive control circuit board 2, and a part of such a heating active element 2a is
By disposing in direct contact with 12, the heat generated by the heated distribution duct 12 and the heat generating active element 2a can be efficiently discharged to the outside.

In this case, the distribution duct 12 is cooled by natural air and does not use a heat radiating fan as in the conventional case, so that there is no danger of generating noise, and such a display device is suitable for application in a quiet environment. It is.

FIG. 2A is a perspective view of a main part of a plasma display device according to a second embodiment of the present invention, and portions having the same functions as those in FIG. 1 are denoted by the same reference numerals. This embodiment is different from the first embodiment shown in FIG. 1 in that a vertical duct 12 for the cooling medium penetrating vertically through the closed casing 11 and an intermediate portion of the vertical duct 12 for the cooling medium are provided. And a horizontal distribution duct 13 connected to communicate with the section, and a blower fan 14 is provided in the horizontal distribution duct 13.

In such a configuration, not only the horizontal flow duct 13 but also the vertical flow duct 13
In order to efficiently release 12 heat to the outside and cool it,
The connection position of the horizontal flow duct 13 communicating with the vertical flow duct 12 is generally set to a position where Ld <Lu in the length L of the vertical flow duct 12 as shown in FIG. It is preferable to connect to. However, the blower fan 14
When the air flow rate is relatively large, it is desirable to connect the vertical flow duct 12 to a position where Ld = Lu in the length L.

As the horizontal flow duct 13 connected to the vertical flow duct 12, the drive control circuit board 2 as shown in FIG. It is connected in the horizontal direction of the vertical distribution duct 12 so as to be parallel to the surface, and the other opening 13 a is opened on the side surface of the closed casing 11.

According to the structure of this embodiment, although the environment is somewhat deteriorated due to the noise generated by the blower fan 14,
The vertical distribution duct 12 is cooled more efficiently without allowing dust or the like to enter the inside of the enclosure 11 from the outside.
Since the temperature in 11 can be efficiently reduced in proportion thereto, the temperature rise of PDP 1 and drive control circuit 2 can be extremely effectively prevented.

In the structure of this embodiment, a dust filter or a dust screen 15 for preventing foreign substances or dust from entering the openings 13a and 13b of the horizontal flow duct 13 is provided. In addition, it is possible to prevent the blower fan 14 from interfering with the blower due to foreign matter intrusion or abnormal stop.

Further, since there is nothing in the vertical flow duct 12 that obstructs the airflow flowing from below to above, even if the blower fan 14 is abnormally stopped, Since the cooling of the vertical distribution duct 12 heated by the heat generated in the closed casing 11 by the natural air circulation action upward from above can be continued even if the efficiency is somewhat reduced, the display The reliability of the device can be ensured.

FIG. 3 is an exploded perspective view showing a main part of a plasma display device according to a third embodiment of the present invention, and portions having the same functions as those in FIG. 1 are denoted by the same reference numerals. This embodiment is different from the first and second embodiments shown in FIGS. 1 and 2 in that, as shown in FIG. 3A, for example, a PDP 1 for displaying characters and images by plasma discharge, FIG. 3B is a cross-sectional side view of a main part of FIG. 3B between a cooling medium circulation duct 22, 23, and a frame 21 made of metal such as aluminum or an aluminum alloy integrally formed by combining with a base material. As shown in, for example, an electrically insulating material having a relatively small heat storage capacity, good heat conductivity and good heat dissipation, such as transformer oil or silicone oil, is provided with a heat conductive material 25 sealed in a plastic bag or the like. That is, the drive control circuit board 2 is fixedly supported on the frame 21.

According to such a configuration, the PDP 1 and the plurality of distribution ducts 22, 23, 24 are integrally formed with the frame 21, or the PDP 1 and the frame 21 are each composed of the distribution ducts 22, 23,
24 and the drive control circuit board 2 can be simultaneously contacted by the heat conductive material 25 (in this case, the heat conductive material 25
And the drive control circuit board 2 can be brought into contact through the gaps between the respective flow ducts 22, 23, 24. ), So that the PDP 1 and the drive control circuit board 2
Can be prevented very effectively.

As still another embodiment, as shown in a perspective view of a main part having a partial side cross section of FIG.
With the configuration in which the heat radiation fins 27 are provided on the back surface of the closed casing 11 in the embodiment, the cooling of the hot air generated in the closed casing 11 and the circulation duct of the cooling medium heated by the hot air can be performed by the above-described cooling method. It is performed more efficiently than the device configuration of the third embodiment, the temperature in the closed casing 11 can be efficiently reduced, and the temperature rise of the PDP 1 and the drive control circuit board 2 can be more effectively prevented. it can.

The installation of the radiating fins 27 as described above is not limited to the case of this example, but may be applied to, for example, the device configuration of each embodiment of FIGS. 1 and 2 as necessary. In addition, the cooling effect of lowering the temperature inside the closed casing 11 can be further improved.

The cooling medium flow ducts (vertical flow ducts) 12, 22, 23, and 24 in each of the above embodiments include at least one of the inner surface and the outer surface thereof, for example, as shown in FIG. Distribution duct as shown in the perspective view
12 (22, 23, 24) is further provided with a radiation fin 26 on the inner surface, so that the circulation ducts 12, 22, 23, 24 heated by the hot air generated in the closed casing 11 Is efficiently performed, the temperature in the closed casing 11 can be efficiently reduced, and the temperature rise of the PDP 1 and the drive control circuit board 2 can be more effectively prevented.

In each of the above embodiments, the cooling medium flow ducts (vertical flow ducts) 12, 22, 23, and 24 are described as examples in which straight and straight shapes are used. However, the shape may be modified into an L-shape or an S-shape as required, in which case the heat receiving surface area increases and the heat radiation efficiency improves.

Further, in each of the embodiments described above, an example is described in which the apparatus housing is directed to a sealed housing 11 having a sealed structure in which the front surface is closed by the PDP 1. The present invention is not limited to such an embodiment. For example, the present invention can be applied to a closed housing in which the device housing has a closed structure in which the front surface is closed by various filters disposed on the front surface of the PDP 1. Can be applied as a matter of course, and similarly, the temperature in the closed casing can be efficiently reduced.

[0039]

As is apparent from the above description, according to the plasma display device of the present invention, the device housing itself containing the PDP supported by the frame and the drive control circuit board is externally exposed to foreign matter such as dust. Good thermal conductivity cooling with metal or metal coating in close proximity to the drive control circuit board and frame in the sealed housing, with a sealed structure that completely prevents intrusion of unwanted electromagnetic waves to the outside and unnecessary electromagnetic wave radiation to the outside By providing a configuration in which a medium circulation duct is penetrated, the intrusion of foreign matter such as dust from the outside into the inside and the emission of unnecessary electromagnetic waves to the outside are completely prevented in the closed casing. It is possible to efficiently radiate heat to the outside naturally or to forcibly radiate the heat by a blower fan.

Therefore, it is possible to prevent a decrease in display characteristics (brightness, etc.) due to an increase in the temperature of the PDP, a deterioration in life due to thermal distortion, etc., and a damage due to overheating of the drive control circuit, etc., and to improve the performance of the display device And contribute to practically excellent effects.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a main part of a first embodiment of a plasma display device according to the present invention.

FIG. 2 is a perspective view of a main part and a sectional side view of a main part showing a second embodiment of the plasma display device of the present invention.

FIG. 3 is an exploded perspective view of a main part and a sectional side view of a main part showing a third embodiment of the plasma display device of the present invention.

FIG. 4 is a perspective view showing a main part of a plasma display device according to another embodiment of the present invention, which has a partial cross section.

FIG. 5 is a perspective view of a main part showing still another embodiment of the plasma display device of the present invention.

FIG. 6 is a schematic exploded perspective view illustrating a conventional general plasma display device.

FIG. 7 is a sectional side view of a main part for explaining a conventional plasma display device.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 PDP 2 Drive control circuit board 2 a Active heat generating element 3, 21 Frame 5 Mounting tool 11 Sealed housing (device housing) 11 a Front housing 11 b Rear housing 12, 22, 23, 24 Distribution duct (vertical Distribution duct) 12a, 12b, 13a, 22a, 22b Opening 13 Horizontal distribution duct 14 Blower fan 15 Dustproof net 25 Thermal conductive material 26, 27 Radiation fin

Claims (1)

[Claims] 1. A plasma display device in which a heating active element for driving control is arranged in a housing supporting a plasma display panel on a front surface thereof, wherein the housing has a sealed structure in which the front surface is closed by the plasma display panel. And a cooling medium distribution duct penetrating therethrough is provided in the closed casing.