KR20050051154A - Plasma display device - Google Patents

Abstract

According to the present invention, a plasma display device is disclosed. The plasma display apparatus includes a plasma display panel on which an image is implemented, a chassis base disposed to face the plasma display panel, and a plurality of circuit elements installed on the chassis base. A heat pipe for diffusing the heat in the planar direction of the circuit device is further provided. According to the disclosed plasma display apparatus, heat dissipation of circuit elements can be promoted.

Description

Plasma display device

The present invention relates to a plasma display device, and more particularly, to a plasma display device having an improved structure to promote heat dissipation of a circuit element.

The plasma display device is a flat panel display device that displays an image using a gas discharge phenomenon, and is excellent in various display capacities such as display capacity, brightness, contrast, afterimage, and viewing angle. In addition, it is attracting attention as a next-generation flat panel display device that can replace a CRT because of its thin and large-screen display.

The plasma display apparatus includes a plasma display panel in which an image is embodied, and a chassis base disposed opposite to the display panel and a circuit unit installed in the chassis base.

The plasma display panel includes a first panel and a second panel bonded to each other. The first panel and the second panel are provided with a plurality of pairs of discharge sustaining electrodes and a plurality of address electrodes, respectively, and the second panel has a plurality of discharges. The partition which partitions a cell is provided.

In the plasma display apparatus configured as described above, gray scale can be expressed by selectively performing discharge on the discharge cells, and therefore, various colors can be realized.

In order to perform such selective discharge, signals sequentially controlled are applied to the plurality of address electrodes, and a plurality of driving elements connected to the address electrodes are mounted on the display apparatus.

The driving device mounted thereon is a heat generating device that generates a large amount of heat. If the generated heat is not removed promptly, the plasma display device can be smoothly driven due to malfunction due to deterioration of the device or thermal destruction due to thermal stress in severe cases. It is hard to expect.

According to the prior art for solving the heat dissipation problem of the drive element, the drive element is mounted on the chassis base, the cover plate is provided with a thermally conductive plate on the back of the drive element heat generated from the drive element chassis base And to the cover plate.

By the way, since the chassis base functions as a heat sink that promotes heat dissipation of the plasma display panel and the various circuit elements provided in the chassis base, heat generated in these heating elements is concentrated in the chassis base.

In addition, there is a limit to the heat dissipation through the cover plate is simply provided with a thermally conductive plate, there is a problem that the heat dissipation of the drive element is not effective.

In particular, in recent years, since the discharge cells tend to be highly detailed, the driving elements must be more densely mounted, and thus the heat dissipation problem of the driving elements is further increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and other problems, and an object thereof is to provide a plasma display device in which heat dissipation of a circuit element is promoted.

In order to achieve the above object and other objects, the plasma display device of the present invention, the plasma display panel in which the image is implemented, the chassis base disposed to face the plasma display panel and a plurality of installed in the chassis base In the plasma display device having a circuit element, a heat pipe for diffusing heat generated in the circuit element in the planar direction of the circuit element is further provided. The circuit device may be a driving device for applying a driving signal to the plasma display panel.

A cover plate for facilitating heat dissipation may be further provided on the opposite side of the chassis base of the circuit element, and a heat conductive medium may be interposed on the chassis base side and the cover plate side of the circuit element, respectively.

In addition, a cover plate for promoting heat dissipation may be further provided on the opposite side of the chassis base of the circuit element, and the heat pipe may be installed on the cover plate.

In addition, the heat pipe may be installed between the chassis base and the circuit element.

The heat pipe may be provided in a plate shape or an oval having a wide contact area.

Hereinafter, with reference to the accompanying drawings, it will be described in detail preferred embodiments of the present invention.

1 is an exploded perspective view showing a plasma display device according to an embodiment of the present invention, Figure 2 is a view showing the plasma display device of Figure 1, a cross-sectional view taken along A-A. 3 is an exploded perspective view illustrating the plasma display panel of FIG. 2.

1 and 2, the plasma display apparatus includes a plasma display panel 40, a chassis base 60 disposed to face the plasma display panel 40, and a heat dissipation sheet interposed between the display panel 40 and the chassis base 40. And a circuit portion 70 to which the chassis base is mounted.

Referring to FIG. 3, the plasma display panel 40 includes a first panel 20 and a second panel 30 bonded to each other.

The first panel 20 serving as the display portion of the image includes a first substrate 21, a discharge sustaining electrode 22, a bus electrode 23, a first dielectric layer 24, and a protective layer 25. .

A plurality of pairs of discharge sustaining electrodes 22 may be formed on the first substrate 21 in a predetermined pattern, for example, a stripe pattern. In order to smoothly supply current to the discharge sustaining electrodes 22, a discharge sustaining electrode ( The bus electrode 23 is formed to be in contact with 22.

In addition, a first dielectric layer 24 filling the discharge sustaining electrode 22 and the bus electrode 23 and a protective layer 25 protecting the first dielectric layer 24 are disposed on the first substrate 21. The first panels 20 are sequentially stacked.

The second panel 30 includes a second substrate 31, an address electrode 32, a second dielectric layer 33, a partition 34, and a fluorescent layer 35.

On the second substrate 31, a plurality of address electrodes 32 are formed in a predetermined pattern, for example, a stripe pattern.

In addition, a second dielectric layer 33 is formed to cover the address electrode 32, and a partition wall 34 is formed on the second dielectric layer 33 substantially in parallel with the address electrode 32. 34 divides a plurality of discharge cells in which discharge is performed.

Then, the fluorescent layer 35 is applied on the side surface of the partition wall 34 in the second dielectric layer 33 of the discharge cell.

The address electrode 32 is electrically connected to the driving element 71a through a wiring 72, and the driving element 71a sequentially applies a scan signal to each address electrode 32. In this way, by applying a controlled signal to each electrode 32, the discharge cells can be selectively discharged, and therefore, various colors can be realized by the gradation representation.

1 and 2, the chassis base 60 serves as a heat sink to promote heat dissipation of the plasma display panel 40 and the circuit unit 70. For this purpose, a material such as aluminum having excellent thermal conductivity is used. It is provided with. The chassis base 60 may be manufactured by die casting.

The heat dissipation sheet 50 is interposed between the display panel 40 and the chassis base 60 so that the panel 40 and the chassis base 60 are in close contact with each other.

The chassis base 60 is provided with a circuit unit 70 for driving the plasma display panel 40.

As shown in FIG. 1, the circuit unit 70 includes a circuit element 71 such as a driving element 71a, a circuit board on which a plurality of circuit elements 71 are mounted, various wirings, and the like. Here, as the wiring 72 connected to the driving element 71a, a flexible printed circuit (FPC) may be used, and the driving element 71a may be a chip on film (COF) or TCP (on a film constituting the FPC). Tape Carrier Package).

The driving element 71a is mounted to the chassis base 60 by the cover plate 83 being fastened to the reinforcing material 61 via the driving element 71a. When the cover plate 83 is made of a thermally conductive and electrically conductive material, it may perform heat dissipation and EMI shielding of the driving element 71a and may also serve to protect the wiring 72.

As shown in FIG. 2, a first heat conductive medium 81 is interposed on the cover plate 83 side of the driving element 71a, and a second heat conductive medium 82 is interposed on the reinforcing material 61 side.

The first and second thermal conductors 81 and 82 are configured to bring the driving element 71a into close contact with the cover plate 83 and the reinforcing material 61, respectively, so that heat generated from the driving element 71a is covered with the cover plate 83. ) And the chassis base 60 to be quickly conducted.

The first and second thermal conductors 81 and 82 may be provided with various types of heat dissipating materials. For example, the matrix resin material may be provided in a form containing a heat transfer filler. An epoxy resin may be used as the matrix resin material, and aluminum, graphite, copper powder, or the like may be used as the heat transfer filler.

In addition, it may be provided as a high oriented graphite (high oriented graphite), the high oriented graphite film is a heat dissipating material having a high thermal conductivity in a specific direction by being arranged so that the graphite crystals are directional. When such a highly oriented graphite film is provided to promote thermal conduction in the planar direction of the drive element 71a, heat generated in the drive element 71a is rapidly diffused in the planar direction to improve heat dissipation performance.

As shown in FIG. 2, the heat pipe 100 is installed on the cover plate 83. Here, the heat pipe 100 may be attached to the cover plate 83 using a thermally conductive adhesive (not shown), or may be coupled to the cover plate 83 by welding or brazing.

 4 shows a heat pipe that can be employed in the present invention. Referring to the drawings, the heat pipe 100 is closed at both ends and is provided inside the outer pipe 100a and the outer pipe 100a filled with the working fluid 100c therein, and is disposed on the condensation part 102 side. It consists of a wick pipe (100b) for moving the working fluid (100c) to the evaporator 101 side through a capillary phenomenon. The wick pipe (100b) is a pipe formed of a network structure is not permeable to the liquid, but the vapor permeable structure. In addition, the working fluid 100c used in the heat pipe 100 uses methanol or distilled water, which is a liquid easily vaporized at room temperature.

Looking at the operating principle, the working fluid 100c vaporized in the evaporator 101 in contact with the relatively high temperature portion absorbs a large amount of energy in accordance with the phase change. The vaporized working fluid 100c is moved to the inside of the wick pipe 100b and is rapidly moved toward the condensation part 102 which is a relatively low temperature part by convection. The steam reaching the condenser 102 is liquefied again through conductive heat transfer and exits to the outside of the wick pipe 100b. The escaped working fluid 100c is moved back to the evaporator 101 by convection and capillary action.

The heat pipe 100 has a thermal conductivity of approximately 10000 W / mK or more, which is 2,000 times higher than that of copper.

Therefore, when the plurality of driving elements 71a and the heat pipe 100 are thermally coupled, rapid thermal conductivity may be achieved in the planar direction of the cover plate 83, and thus the plurality of driving elements 71a may exhibit different heat generation states. The maximum temperature of the driving element 71a may be reduced while the temperature deviation of N) is eliminated.

Quantitatively, the temperature deviations of the plurality of drive elements 71a are maintained at a level of about 3 degrees, so that the temperature deviations of the drive element 71a are reduced, thereby reducing the maximum temperature of the drive element 71a.

The heat pipe 100 may be provided in various shapes. In order to increase the contact area with the cover plate 83, the heat pipe 100 may be provided in a plate shape or an oval shape.

5 illustrates another embodiment of the present invention. Referring to the drawings, the heat pipe 100 is installed in the chassis base 60, and the reinforcing material 61, the driving element 71a, and the cover plate 83 are sequentially installed. In addition, the first and second thermally conductive media 81 and 82 are inserted into the cover plate 83 side and the reinforcement 61 side of the drive element 71a.

Since the heat pipe 100 is installed in the chassis base 60, the heat generated from the driving element 71a can be quickly diffused in the planar direction, and the temperature deviation of the panel 40 is removed to improve luminance. Can also be obtained.

According to the plasma display device of the present invention, the first heat conductive medium and the second heat conductive medium in contact with the drive element are inserted, and heat pipes are provided, thereby facilitating heat dissipation of the drive element.

The first thermally conductive medium and the second thermally conductive medium facilitate heat dissipation of the driving device by rapidly conducting heat generated from the driving device to the cover plate and the chassis base, respectively.

In addition, the heat pipe provided over the plurality of driving elements allows heat generated in the driving elements to quickly diffuse in the planar direction of the elements, thereby facilitating heat dissipation of the driving elements.

Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, it is merely exemplary, and various modifications and equivalent other embodiments are possible from those skilled in the art to which the present invention pertains. You will understand the point. Therefore, the true scope of protection of the present invention should be defined by the appended claims.

1 is an exploded perspective view showing a plasma display device according to an embodiment of the present invention;

FIG. 2 is a view illustrating the plasma display device of FIG. 1, and taken along line A-A. FIG.

3 is an exploded perspective view illustrating the plasma display panel of FIG. 2;

4 is a cross-sectional view showing a heat pipe that can be employed in the present invention;

5 is a cross-sectional view illustrating a plasma display device according to another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

20 ... 1st panel 21 ... 1st board

22 Discharge holding electrode 23 Bus electrode

24 first dielectric layer 25 protective layer

30 ... second panel 31 ... second substrate

32 ... address electrode 33 ... second dielectric layer

34 bulkhead 35 fluorescent layer

40 ... plasma display panel 50 ... heat-resistant sheet

60 ... chassis base 70 ... circuit

71 ... circuit element 71a ... driving element

72 Wiring 81 First heat conducting medium

82 second heat transfer medium 83 cover plate

100.Heat Pipe 100a ... Outer Pipe

100b ... 왹 pipe 100c ... Working fluid

101 ... evaporator 102 ... condenser

Claims (7)

10. A plasma display apparatus comprising a plasma display panel on which an image is implemented, a chassis base disposed to face the plasma display panel, and a plurality of circuit elements provided on the chassis base. And a heat pipe for diffusing heat generated in the circuit device in a planar direction of the circuit device. The plasma display apparatus of claim 1, wherein the circuit element is a driving element for applying a driving signal to the plasma display panel. The plasma display apparatus of claim 1, further comprising a cover plate for promoting heat dissipation on the opposite side of the chassis base of the circuit element, and a heat conductive medium interposed on the chassis base side and the cover plate side of the circuit element, respectively. . The plasma display apparatus of claim 1, further comprising a cover plate on a side opposite to the chassis base of the circuit element for promoting heat dissipation, and wherein the heat pipe is installed on the cover plate. The plasma display apparatus of claim 1, wherein the heat pipe is disposed between the chassis base and the circuit element. The plasma display apparatus of claim 1, wherein the heat pipe has a plate shape having a large contact area. The plasma display apparatus of claim 1, wherein the heat pipe has an elliptical shape with a wide contact area.