KR20040025382A - Assembly of plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel assembly is provided to achieve improved contrast and luminance, while protecting the plasma display panel from heat. CONSTITUTION: A plasma display panel assembly comprises a plasma display panel(100) on which images are formed by a plasma discharge; a heat radiation sheet(20) attached on the rear surface of the plasma display panel, and which has a black color; and a frame chassis(30) attached on the plasma display panel through the heat radiation sheet, and which radiates the heat generated from the plasma display panel. The heat radiation sheet has a plurality of penetrating holes(21) and grooves for interconnecting the penetrating holes.

Description

Assembly of plasma display panel

The present invention relates to a plasma display panel assembly, and more particularly, to a plasma display panel assembly in which a heat dissipation sheet for bonding a plasma display panel and a chassis and transmitting and dissipating heat generated from the plasma display panel to the chassis is improved. will be.

One-sided discharge devices have at least one pair of electrodes, which generate a discharge when a voltage is applied to the electrodes. Examples of such a discharge device include discharge lamps such as fluorescent lamps, gas laser generators, and plasma display panels.

Plasma display panels are attracting attention as next-generation display panels having excellent display performance such as display capacity, brightness, contrast, and viewing angle, and approaching the performance of a cathode ray tube.

The plasma display panel is heated to 60 to 80 degrees by plasma discharge during driving. Such heating of the plasma display panel may adversely affect a phosphor, an electrode, an electromagnetic wave shielding film, and the like, and therefore it is necessary to suppress the temperature below a predetermined temperature.

1 shows an example of a plasma display panel assembly in which a means for dissipating heat of the plasma display panel is provided.

As shown in the drawing, the plasma display panel 11 and the frame chassis 13 for heat dissipation of a plate bonded by the plasma display panel and the heat dissipation sheet 12 are installed to be spaced apart from the frame chassis 13 by a predetermined distance. And a circuit board 14 for driving the plasma display panel.

In the plasma display panel assembly configured as described above, heat generated from the plasma display panel is transferred to the frame chassis 13 through the heat dissipation sheet 12 and is discharged. However, since the adhesive sheet is made of silicon, it is stretchable and bubbles are often generated at the adhesive portion when attached to the back surface of the flat plasma display panel. The bubble is formed in the area where the heat transfer is not made smoothly due to air, there is a problem that the cell for the discharge of the plasma display panel of this portion is deteriorated. In addition, in the case of the frame chassis 13 is manufactured as a cast of aluminum, etc., the flatness is lowered, there is a problem that the decrease in the flatness is poor adhesion to the heat radiation sheet 12, the heat transfer efficiency is lowered.

On the other hand, since the frame chassis 13 is made of aluminum, its surface is white, and the heat dissipation sheet is also made of a bright color, so that the contrast of the image formed by the plasma display panel 11 is lowered. That is, since the front substrate and the rear substrate of the plasma display panel 11 are made of transparent glass or translucent glass, the back light and the reflected light flow from the heat radiating sheet 12 and the frame sheet 13 located on the back side, and the image is introduced. There is a problem in that the brightness and contrast of the light is lowered.

On the other hand, the technical configuration of the heat dissipation sheet is disclosed in Japanese Patent Application Laid-open No. Hei 10-254372 for suppressing bubble generation and improving heat dissipation characteristics when the panel and the frame sheet are adhered. Since the heat dissipation sheet is formed of silicon, even though the heat dissipation sheet is formed, the heat dissipation sheet is made of silicon, so it is difficult to maintain the correct shape during storage and it is not easy to form the unevenness on the silicon sheet.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above problems, and to provide a plasma display panel assembly capable of improving contrast of an image formed by a plasma display panel and improving heat absorption and heat dissipation efficiency.

1 is an exploded perspective view of an assembly of a conventional plasma display panel;

2 is an exploded perspective view of a plasma display panel assembly according to the present invention;

Figure 3 is a perspective view showing the heat dissipation sheet,

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

20; Heat dissipation sheet

30; Frame chassis

100; Plasma display panel

In order to achieve the above technical problem, the present invention provides a plasma display panel assembly comprising a plasma display panel for forming an image by discharge, a heat dissipation sheet attached to the rear surface of the plasma display panel and having a black color, and a plasma by the heat dissipation sheet. And a frame chassis attached to the display panel to emit heat generated from the plasma display panel.

In the present invention, the heat dissipation sheet is formed with a plurality of through holes and grooves connecting the through holes.

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

2 illustrates an embodiment of a plasma display panel assembly according to the present invention.

As shown, the plasma display panel assembly according to the present invention includes a plasma display panel 100 that forms an image by plasma discharge, and a thermally conductive heat dissipation sheet 20 attached to a rear surface of the plasma display panel 100. And a frame chassis 30. Circuit boards 40 for driving the plasma display panels 100 are attached to the frame chassis 30.

The heat dissipation sheet 20 is made of black. The heat dissipation sheet 20 may include a black dye in silicon, and a plurality of through holes 21 are formed. A groove 22 is formed on a surface of at least one side of the heat dissipation sheet 20 in a vertical or horizontal direction as shown in FIG. 3. The groove 22 may be formed in a lattice shape, and the through hole 21 may be formed to be small so as not to contain bubbles during pressure bonding, and the groove 22 may allow air to be discharged. It is preferable to form so as to extend to the edge of the heat radiation sheet (20). In addition, it is preferable to form a fine protrusion (not shown) on the surface corresponding to the plasma display panel 100 of the heat dissipation sheet so that the air can be discharged smoothly.

On the other hand, the heat dissipation sheet may be made of black only on the side corresponding to the plasma panel, may be made of an adhesive sheet, a separate adhesive layer for bonding on both sides may be further provided.

The frame chassis 30 is attached to the rear surface of the plasma display panel 100 by the heat dissipation sheet 20 to release heat generated from the plasma display panel 100 and to drive the plasma display panel 100. As the circuit board 40 is installed, a heat radiation 휜 and a slot for heat radiation may be formed.

Referring to the operation of the plasma display panel assembly according to the present invention configured as described above are as follows.

Plasma display panel according to the present invention is bonded to the frame chassis 30 by the heat dissipation sheet 20 to dissipate heat generated therefrom, since the heat dissipation sheet 20 is made of black color, the plasma display panel 100 Absorb light emitted to the back side when the image is formed. Accordingly, it is possible to prevent the light emitted from the back of the plasma display panel from being reflected back to the front side to reduce image contrast. In addition, since the heat dissipation sheet 20 is black, absorption of heat generated from the plasma display apparatus 100 is prevented. In this case, the heat transfer from the plasma display device 100 to the frame chassis 30 is smoothly performed.

In addition, a plurality of through holes 21 are formed in the heat dissipation sheet 20, and the through holes are connected by the grooves 22 formed in the heat dissipation sheet on the side surface corresponding to the plasma display panel. It is possible to prevent the air layer in a large area from remaining between the back of the) and the heat dissipation sheet 20. In more detail, when the plasma display panel 100 and the heat dissipation sheet 20 are attached, bubbles of the through hole 21 are discharged through the grooves 22 and the heat dissipation sheet is compressed by the pressing force, thereby compressing the plasma display panel ( The volume of pores between the rear surface of the substrate 100 and the heat dissipation sheet 20 can be minimized to prevent the air layer from remaining on the adhesive surface. Therefore, the heat transfer efficiency of heat generated from the plasma display panel 100 to the frame chassis 30 can be improved.

The inventors of the present invention measure the luminance and contrast when the heat dissipation sheet to which the plasma display device and the frame chassis are attached is white and black.

Could get a ticket.

Module Whee Black heat dissipation sheet White heat sink Experiment Panel 1 (42 ") Brightness 748 725 Darkroom brightness 0.74 1.1 Contrast 1011: 1 659: 1 Experiment Panel 2 (42 ") Brightness 598 587 Darkroom brightness 0.74 1.1 Contrast 808: 1 533: 1

The darkroom luminance was measured with an image display device in the darkroom and the white condition in the darkroom with a 1% window pattern. The measurement equipment was Minolta CA-100. In addition, since the unit of luminance is cd / m 2 and the contrast is the maximum luminance / dark luminance, only the ratio is expressed.

As can be seen from the table, the black heat dissipation sheet compared to the white heat dissipation sheet was found to significantly improve the contrast, and the luminance was also relatively improved.

As described above, the plasma display panel assembly of the present invention blocks the light incident from the rear surface of the plasma display panel by blocking the light emitted from the back surface of the plasma display panel by blacking the heat dissipation sheet that connects the plasma display panel and the frame chassis. By reducing the reflection, contrast can be improved and heat can be absorbed and transferred to the frame chassis to prevent the plasma display panel from being damaged by heat.

The invention has been described with reference to the embodiments shown in the drawings. This is merely exemplary, and it will be understood by those skilled in the art that various modifications and embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (2)

The plasma display panel assembly includes a plasma display panel which forms an image by discharge, a heat dissipation sheet attached to the rear surface of the plasma display panel and having a black color, and is attached to the plasma display panel by the heat dissipation sheet, and is generated from the plasma display panel. And a frame chassis for dissipating the generated heat. The method of claim 1, A plasma display panel assembly comprising a plurality of through holes and grooves connecting the through holes to the heat dissipation sheet;