KR100787437B1 - Plasma display apparatus with heat transfer media - Google Patents

Abstract

According to an aspect of the present invention, there is provided a plasma display apparatus comprising: a plasma display panel displaying an image, a chassis base supporting the plasma display panel; And a heat conducting medium interposed between the plasma display panel and the chassis base, wherein the heat conducting medium includes carbon fibers.

Description

Plasma display apparatus with heat conducting medium

1 is an exploded perspective view of a plasma display apparatus in which a heat conductive medium in the form of a heat radiation sheet for a plasma display apparatus according to the prior art is shown.

2 is an exploded perspective view of a plasma display device having a thermally conductive medium according to the present invention.

3 is a plan view of a thermal conductive medium for a plasma display device according to the present invention.

4 is a partial cross-sectional view taken along line IV-IV of FIG. 3.

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

100: plasma display device

110: plasma display panel

120: chassis base 130: thermal conductive medium

131: weft part 132: inclined part

140: circuit board

The present invention relates to a thermally conductive medium employed in a plasma display device, and more particularly, to a multifunctional thermally conductive medium having low manufacturing cost, good thermal conductivity and heat dissipation effect, shock and vibration absorption effect, and enhanced strength. It relates to a plasma display device provided.

BACKGROUND ART In general, a plasma display device is a flat panel display device that realizes an image by using a gas discharge phenomenon, and has been spotlighted as a next-generation flat panel display device because it can be thinned and can realize a large screen having a wide viewing angle.

Such a plasma display device includes a plurality of driving circuit boards in which a chassis base functioning as a structural member is coupled to a plasma display panel displaying an image using gas discharge, and a plurality of driving circuit boards are mounted on the rear thereof. Thereafter, these are housed in a case or the like and assembled by assembling necessary additional parts.

1 is a partially exploded perspective view of a plasma display device according to the prior art. Referring to FIG. 1, the plasma display panel 10 and the chassis base 20 formed by sealing the front panel 11 and the rear panel 12 along their edges have a heat dissipation sheet 15 therebetween. After interposing and arranging an adhesive means 16 such as a double-sided tape along the edge of the sheet 15, the plasma display panel 10 and the chassis 30 are pressed in their joining direction to be bonded in an adhesive manner.

In operation, the plasma display panel 10 displays a high brightness image, and in this process, a large amount of heat is generated in the plasma display panel 10. If this heat is accumulated without being released, there is a possibility that the image display performance of the plasma display panel 10 may be adversely affected. Therefore, this heat needs to be radiated by an appropriate method. This heat is mainly transferred to the chassis base 20 through the heat dissipation sheet 15 to radiate heat from the surface of the chassis base 20.

Here, the conventional heat dissipation sheet 15 is composed of a graphite material called eGraf in order to eliminate heat dissipation and afterimage of the panel, this eGraf material has a problem that the price is quite expensive.

In addition, in the related art, when the heat dissipation sheet is attached to the panel using an adhesive, there is a problem that the thermal conductivity is poor.

In addition, during operation, the plasma display panel 10 also generates noise due to vibrations of components therein, and the vibrations propagate toward the chassis base 20 through the heat dissipation sheet 15. In addition, the impact applied to the chassis base 20 may be transmitted to the plasma display panel 10 through the heat dissipation sheet 15 as it is, thereby damaging the plasma display panel 10.

As such, the heat dissipation sheet 15 that performs a simple heat conduction function may block or reduce various various properties such as vibration and noise, which may be transmitted or propagated between the plasma display panel 10 and the chassis base 20. There is a problem that can not.

The present invention was devised to solve the above problems, while the manufacturing cost is much reduced, the plasma display having a multi-functional heat conducting medium having good heat conduction and heat dissipation effect, shock, vibration and noise absorption effect and reinforced strength The purpose is to provide a device.

In order to achieve the above object and other objects, the plasma display device having a heat conductive medium according to an embodiment of the present invention,

A plasma display panel for displaying an image;

A chassis base supporting the plasma display panel; And

And a heat conducting medium interposed between the plasma display panel and the chassis base.

The thermally conductive medium comprises carbon fibers.

Here, it is preferable that the heat conductive medium further includes metal fibers, and the heat conductive medium is preferably a twill weave woven sheet.

On the other hand, the carbon fiber and the metal fiber are bonded by a binder,

The thermally conductive medium is preferably attached to the chassis base by an adhesive tape.

Moreover, it is preferable that the said heat conductive medium further contains resin.

In addition, the metal fiber is preferably copper or aluminum.

In addition, the binder preferably contains polyvinyl alcohol.

The heat conducting medium is preferably made of chopped fibers.

Hereinafter, with reference to the accompanying drawings will be described in detail a plasma display device having a heat conductive medium according to the present invention.

2 is an exploded perspective view of a plasma display device having a thermally conductive medium 130 of the present invention. Referring to FIG. 2, the plasma display apparatus 100 includes a plasma display panel 110 displaying an image using gas discharge and a chassis disposed behind the plasma display panel 110 to support the plasma display panel. The base 120 and the plasma display panel 110 and the chassis between the base 120 of the present invention to effectively control the various properties transferred between the plasma display panel 110 and the chassis base 120 And a thermally conductive medium 130 according to one aspect. The thermally conductive medium 130 is preferably a heat dissipating fabric sheet.

In addition, a predetermined number of circuit boards 140 for driving the plasma display panel 110 and a connection cable 145 for electrically connecting the plasma display panel 110 and the circuit board 140 are further provided. .

The plasma display panel 110 includes a front panel 111 and a rear panel 112. Although not shown in FIG. 2, the front panel 111 may include a front substrate, discharge sustain electrodes formed on a rear surface of the front substrate, a first dielectric layer covering the discharge sustain electrodes, and a protective film formed on the first dielectric layer. The rear panel 112 includes a rear substrate, address electrodes formed on the front surface of the rear substrate to intersect the discharge sustaining electrodes, a second dielectric layer covering the address electrodes, and the second dielectric layer. It is preferable to provide the formed partition and the fluorescent substance arrange | positioned in the light emitting cell defined by the said partition. The structure of the plasma display panel 110 is an AC three-electrode surface discharge structure, but the present invention is not limited thereto, and the present invention employs a plasma display panel having various other structures, such as a two-electrode structure and an opposite discharge structure. It can be applied to one plasma display device.

The chassis base 120 may be manufactured by casting or press working, and supports the plasma display panel 110 and the circuit board 140 from the front and the rear, respectively. The chassis base 120 may be formed using a metal having high thermal conductivity such as aluminum to effectively dissipate heat transferred from the plasma display panel 110. In addition, the reinforcement member 125 is installed at the rear of the chassis base 120 to prepare for the deformation of the chassis base 120 by the self-weight and thermal expansion and to reinforce the rigidity of the chassis base 120. The reinforcing member 125 is bent to form a cross-sectional shape of the letter 'b', and is disposed long in the left and right directions at the rear of the chassis base 120. The plasma display panel 110 and the chassis base 130 are adhesive means, such as a double-sided tape disposed between the both of them, with a heat conducting medium 130, which is the heat dissipating fabric sheet, disposed along an edge of the heat conducting medium 130. Are coupled to each other by 116.

In the related art, the heat dissipation sheet used an adhesive to adhere to the panel, in which case the heat dissipation performance of the heat dissipation sheet was deteriorated. Therefore, the present invention uses an adhesive tape (not shown) in attaching the heat dissipation sheet to the panel or chassis base to overcome this disadvantage.

On the other hand, the circuit board 140 performs a function of applying a power and an electrical signal for generating a gas discharge so that the plasma display panel 110 can implement a predetermined image. The circuit board 140 may include a power supply unit supplying power to the plasma display panel 110, a logic unit controlling a signal applied to implement an image, a driver unit applying a voltage to the panel, and the like. In addition, the circuit board 140 and the plasma display panel 110 are electrically connected to each other by a tape carrier package and a connection cable 145.

Here, the thermally conductive medium 130 in the form of a heat dissipating fabric sheet is mainly composed of carbon fibers having excellent thermal conductivity. In the case of carbon fiber, in general, the thermal conductivity of 20 to 500 Wm ^-1 K ^{- 1.} Particularly in the case of carbon fibers, carbon is excellent in thermal conductivity because carbon is a main component thereof.

In the case of making a fabric using the carbon fiber, when explaining the path of obtaining the carbon fiber, when making the fabric using the carbon fiber, the carbon fiber is cut by 10 to 20 cm with chopped fiber and discarded. By using the carbon fiber excellent in thermal conductivity can be obtained at low cost.

Meanwhile, the heat conductive medium 130 may include metal fibers such as copper or aluminum in addition to carbon fibers. At this time, in the mixing of the carbon fiber and the metal fiber to bind the fibers using a binder. In particular, the binder is preferably polyvinyl alcohol (PBA). At this time, it is also possible to use a silicone resin or an acrylic resin, but since the resin itself is not excellent in thermal conductivity, there is a fear that the thermal conductivity of the thermally conductive medium may be lowered, so care should be taken.

On the other hand, the carbon fiber has a variety of components for each middle class, generally, the carbon is 95% or more, and includes a binding agent that focuses the carbon fiber as the remainder. In general, when the carbon content of the carbon fiber is high in order to be high strength, when the carbon fiber is mixed with the plastic resin, the content of the plastic resin is 30%. When the content of the plastic resin increases, the product price increases. It is therefore desirable to optimize at an appropriate level. Thus, for example, it is desirable to use about 50% plastic resin to about 50% carbon fiber by weight. However, the content ratio is not necessarily limited, and the ratio of carbon fibers may be equal to or greater than that of the plastic resin, or vice versa.

The carbon fibers and the metal fibers are attached to each other by a binder, which is a fiber binder, to expose the fiber surface, and the heat dissipation performance is improved when the heat dissipating fabric sheet, which is thus formed, is attached to the panel.

As described above, when the adhesive is used to attach the thermally conductive medium 130 to the panel 110, the thermal conductivity may be degraded, so it is preferable to use an adhesive tape instead of the adhesive.

On the other hand, a binder is used to bond the carbon fiber and the metal fiber, and if the binder is insufficient, the resin may be further blended with these fibers to form a thermally conductive medium. At this time, by blending and molding graphite or carbon black powder in the resin, the low thermal conductivity of the resin can be compensated.

On the other hand, the heat conductive medium 130 is preferably a heat dissipating fabric sheet, in this case it is preferably woven in twill. An example of the twill weave will be described with reference to FIGS. 3 and 4.

3 is a plan view of a heat dissipating fabric sheet which is a heat conducting medium for a plasma display device according to an embodiment of the present invention, and FIG. 4 is a partial cross-sectional view taken along the line IV-IV of FIG. 3.

The heat conducting medium 130, which is the heat dissipating fabric sheet shown in FIG. 3, is a heat dissipating fabric sheet formed using five wefts and warp yarns, respectively, and is a heat dissipating fabric sheet formed in a twill weave manner.

The heat conducting medium 130, which is the heat dissipating fabric sheet, is woven so as to intersect by alternating positions up and down alternately every five rows, and is configured by a twill weaving method regularly distributed such that the intersections do not approach both up, down, left, and right. When the fabric is formed in a twill manner, the surface of the fabric has a flat and smooth surface. Accordingly, the thermally conductive medium 130 formed in the twill manner may contact the plasma display panel 110 and the chassis base 120, which will be described later, with a larger surface area, thereby increasing overall performance.

The thermally conductive medium 130 includes a weft portion 131 disposed horizontally and an inclined portion 132 disposed vertically, and they are woven in a twill manner. The weft part 131 is made of first to fifth weft yarns 131a to 131e, and the inclined part 132 is made of first to fifth warp yarns 132a to 132e.

Referring to Figures 3 and 4, each weft and warp is a structure that intersects every five rows across four rows, which is called "five twill". On the other hand, the twill structure according to the characteristics of the present invention is not limited to these five sheets of twill, and although not shown in the figure, weft and inclined three-sheet twill weave crossed every three rows, or weft and inclined 3 It may be a four-twill cross that crosses every four ol across the ol.

The thermally conductive medium 130 may be disposed between the plasma display panel and the chassis base as a single layer, or may be disposed in a plurality of layers in which a plurality of heat dissipating fabric sheets are stacked. When the thermally conductive medium 130 is arranged in a plurality of layers to form a three-dimensional fabric, a single heat-dissipating fabric sheet (not shown) that is woven into a three-dimensional fabric using weft and warp with five different components as described above It may also be included in the scope of the present invention.

As such, when the thermally conductive medium 130 is coupled to any one or both of the plasma display panel or the chassis base, and the plasma display panel and the chassis base are coupled to each other, the plasma display panel 110 and the heat dissipating fabric sheet may be used. Since the 130 and the chassis base 120 are in close contact with each other, various effects of the thermal conductive medium 130 described with reference to FIG. 3 may be obtained in the plasma display device 100. That is, vibration and noise generated by the plasma display panel 110 may be absorbed through the heat conductive medium 130, and heat generated by the plasma display panel 110 may smoothly absorb the heat conductive medium 130. May be transferred toward the chassis base 120 or may be radiated from the heat conductive medium 130 itself, and heat generated locally on the surface of the plasma display panel 110 may face through the heat conductive medium 130. The electromagnetic wave generated in the plasma display panel 110 may be reduced by the heat conductive medium 130, and may be transmitted to the plasma display panel 110 through the chassis base 120. An external shock that may be absorbed may pass through the heat conducting medium 130.

As described above, according to the present invention, it is possible to form a heat conducting medium at a much lower cost than a conventional heating sheet made of eGraf. A plasma display device having a thermally conductive medium for a multifunctional plasma display device can be provided.

Although the present 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 equivalent other 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 (9)

A plasma display panel for displaying an image; A chassis base supporting the plasma display panel; And And a heat conducting medium interposed between the plasma display panel and the chassis base. The thermal conductive medium includes a carbon fiber and a metal fiber. delete The method of claim 1, And said thermally conductive medium is a twill weave sheet of fabric. The method of claim 1, And the carbon fibers and the metal fibers are bonded by a binder. The method of claim 1, And the thermally conductive medium is attached to the chassis base by an adhesive tape. The method of claim 4, wherein And the thermally conductive medium further comprises a resin. The method of claim 1, And the metal fiber is made of copper or aluminum. The method of claim 4, wherein And the binder comprises polyvinyl alcohol. The plasma display apparatus of claim 1, wherein the heat conductive medium is made of chopped fibers.

Images