KR100669366B1 - Plasma display apparatus having porous heat transfer sheet - Google Patents

Abstract

 The present invention relates to a plasma display apparatus having means for efficiently dissipating heat generated in a panel of a plasma display.

A display device according to the present invention includes a plasma display panel; A chassis base disposed in parallel with one surface of the plasma display panel; And a porous heat transfer sheet interposed between the plasma display panel and the chassis base and having a plurality of pores therein. The porous heat transfer sheet includes: The plasma display panel is disposed adjacent to one surface of the plasma display panel, and the chassis base is spaced apart from each other at a predetermined interval therebetween.

Plasma, porous, heat transfer sheet, chassis base, ventilator

Description

Plasma display device having porous heat transfer sheet {PLASMA DISPLAY APPARATUS HAVING POROUS HEAT TRANSFER SHEET}

1 is a partially exploded perspective view of a plasma display device according to a first embodiment of the present invention.

FIG. 2 is a partial side cross-sectional view of the panel, the heat transfer sheet, and the chassis base of the plasma display device according to the first embodiment of the present invention, taken along line A-A. FIG.

3 is an inside measured photograph of a porous heat transfer sheet made of aluminum.

4 is an inside measured photograph of a porous heat transfer sheet made of graphite.

5 is a partial side cross-sectional view showing a plasma display device according to a second embodiment of the present invention.

6 is a partial side cross-sectional view showing a plasma display device according to a third embodiment of the present invention.

FIG. 7 is a conceptual view illustrating a phenomenon of bright afterimages caused by local heat concentration of a panel. FIG.

The present invention relates to a plasma display device, and more particularly, to a plasma display device having means for efficiently dissipating heat generated in a panel of a plasma display.

With the advent of the information society, the demand for information display devices is becoming more and more diversified, and the demand varies depending on the use such as size, display capacity, and display color, ranging from wristwatches or electronic display character displays to high-definition TVs. In particular, while demand for mobile phones, notebook PCs, and large TVs is increasing, the demand for thinner flat panel display devices is increasing. Such flat panel display devices include liquid crystal display (LCD), organic EL display (OLED), field emission display (FED), and plasma display (PDP).

Among them, as is known, the plasma display apparatus is an apparatus that displays an image on a plasma display panel (PDP) using plasma generated by gas discharge. Therefore, a large amount of heat is basically generated in the plasma display panel due to the high temperature discharge gas. In addition, when the plasma display device has the above basic conditions and increases the discharge degree for improving the brightness, the heat generated in the plasma display panel is increased. Therefore, the plasma display device efficiently discharges the heat. Is important for its smooth operation.

For this reason, in a conventional plasma display apparatus, a plasma display panel is generally attached to a chassis base made of a material having excellent thermal conductivity, and a heat dissipation sheet (or heat conductive sheet) is interposed between the plasma display panel and the chassis base. Heat generated in the plasma display panel is conducted through the heat dissipation sheet and the chassis base to be discharged out of the device. Here, the chassis base is usually manufactured by die casting or pressing using a metal material such as aluminum, and the heat dissipation sheet is provided with acrylic, silicone, urethane, or the like. Since the heat dissipation sheet has a low thermal conductivity of 0.8 to 1.5 W / mK and only transmits heat generated from the panel only by conduction, it must be closely adhered to both the panel and the chassis base at the same time, and the adhesion rate is high. On the adhesive side, however, a large area of air gap is generally generated, resulting in a decrease in the seal area and a decrease in heat dissipation efficiency. When the silicon sheet is attached between the chassis base and the transparent glass using transparent glass instead of the actual panel, the adhesion rate is about 10-20%.

Various attempts have been made to improve heat dissipation efficiency by increasing the actual mounting area of the heat dissipation sheet.

First, a buffer material is attached along the circumference of the panel, a liquid thermal conductive medium is injected into the area surrounded by the buffer material, and then solidified. Then, a display panel is attached to the solid thermal conductive medium to improve heat dissipation efficiency. Plasma display devices are disclosed in US Pat. No. 5,971,566. However, even when the thermally conductive medium is applied, it is difficult to achieve a reliable adhesion rate as the size of the panel increases.

In addition, a plasma display is formed between the plasma display panel and the thermal conductive plate (chassis base) by narrowing the thermal conductive sheet and attaching a heat pipe, a heat radiating fin, and a heat radiating fan to the rear surface of the thermal conductive plate. An apparatus is disclosed in Japanese Patent Laid-Open No. 11-251777. However, the above technique is limited in achieving thinning and low noise of the device.

On the other hand, when there is a difference in the image pattern in the plasma display device, the heat concentration phenomenon of the panel may occur and a bright afterimage may appear.

If the same pattern is realized after a certain time lasting in a pattern brighter than the local surroundings, luminance difference occurs in the region where the local bright pattern portion was and the surrounding region, which is called a bright image. In other words, if the plasma display panel screen lasts for 20 minutes with a full white pattern (when the entire screen is in a white state), the 3% window pattern is continued for 10 minutes, and then switches back to the full white pattern. The afterimage is measured as there is a difference in luminance between the area of the window pattern and the surrounding area. Here, the 3% window pattern refers to a white window in which an image load ratio imposes 3%. It is known that this is because the phosphor luminescence effect is affected by temperature.

Since the display quality is lowered due to the occurrence of the bright image, the thermal conductivity in the flat direction is better than the thickness direction, so that the heat generated in the plasma display panel can be evenly distributed so that the heat distribution of the panel can be uniform. The need for a new server emerges.

Therefore, by using graphite thermal spread sheet which has much higher thermal conductivity in the plane direction than thermal conductivity in the thickness direction, it is possible to reduce the afterimage of the panel by uniformizing the heat generated in the panel in the plane direction quickly. A plasma display device is disclosed in US Pat. No. 5,831,374. However, due to the hard and brittle nature of the graphite material, it is difficult to suppress the generation of air layer when the panel is attached, so that the actual area of adhesion is reduced, heat dissipation efficiency is reduced, and the function of mitigating vibration or shock applied from the outside is not only weak. There is a problem that noise is amplified by being transmitted to the chassis base as it is.

The present invention was devised to solve the above problems, and an object thereof is to attach a porous heat transfer sheet to a plasma display panel that is a heating source, and to separate the heat transfer sheet from the chassis base by a predetermined distance, It is to provide a plasma display device that can increase the actual contact area and rapidly dissipate heat by spreading and diffusing heat generated from the panel through conduction as well as convection.

Another object of the present invention is to provide a plasma display device in which heat transferred from the panel through the heat transfer sheet can be quickly released to the outside by forming a plurality of vent holes in the chassis base.

In order to achieve the above object, a plasma display device according to the present invention includes a plasma display panel; A chassis base disposed in parallel with one surface of the plasma display panel; And a porous heat transfer sheet interposed between the plasma display panel and the chassis base and having a plurality of pores therein. The porous heat transfer sheet includes: The plasma display panel is disposed adjacent to one surface of the plasma display panel, and the chassis base is spaced apart from each other at a predetermined interval therebetween.

Preferably, the porous heat transfer sheet is closely attached to one surface of the plasma display panel.

The porous heat transfer sheet has an open cell type structure in which pores therein are connected to each other, or a closed alveolar form in which pores therein are independently present. cell type).

The size of the pores present in the porous heat transfer sheet is preferably formed to fall in the range of 5 to 80 ppi, the porosity of the porous heat transfer sheet is preferably in the range of 35% to 95%.

The porous heat transfer sheet may be made of a metal material, it is preferably made of a material selected from the group consisting of aluminum, copper, silver, gold, iron, nickel, stainless, brass.

In addition, the porous heat transfer sheet may be made of a material having an anisotropic thermal conductivity, wherein it is preferable that the planar thermal conductivity is greater than at least 5 times larger than the thickness direction thermal conductivity. The porous heat transfer sheet may be made of a material selected from the group consisting of carbon, graphite, carbon nanotubes, and carbon fibers.

On the other hand, between the plasma display panel and the chassis base, a double-sided adhesive member is disposed along the edge of the heat transfer sheet and bonded to opposite surfaces of the plasma display panel and the chassis base, The thickness is formed thicker than the thickness of the heat transfer sheet to form a predetermined gap between the porous heat transfer sheet and the chassis base.

The chassis base has a plurality of ventilation holes (通氣孔) is formed to facilitate the air flow more, it is formed in the chassis base consisting of a substantially rectangular shape including a pair of long sides and a pair of short sides facing each other. These vents are arranged side by side along the long side and short side directions.

The heat transfer sheet according to the present invention may be formed by forming a porous aggregate in which a plurality of fibrous elements are entangled with each other, and the heat transfer sheet is disposed adjacent to one surface of the plasma display panel, and between the chassis base and the chassis base. Are spaced apart from each other at predetermined intervals. As another example, the heat transfer sheet of the present invention may be formed by forming a porous aggregate while a plurality of flakes are agglomerated with each other.

At this time, the fibrous element or flakes may be made of a metal material, and optionally may be made of a material selected from the group consisting of carbon, graphite, carbon nanotubes, carbon fibers.

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

1 is a partially exploded perspective view of a plasma display device according to a first embodiment of the present invention, Figure 2 is a view showing a combination of the panel, heat transfer sheet, chassis base of the plasma display device according to the first embodiment of the present invention A side cross-sectional view taken along a line.

As shown, the plasma display apparatus 10 according to the present embodiment basically includes a plasma display panel 12 and a chassis base 16. The plasma display panel 12 is mounted on one side of the chassis base 16, and a circuit unit (not shown) for driving the plasma display panel 12 is mounted on the other side. The chassis base 16 is disposed substantially parallel to the plasma display panel 12, and a heat transfer sheet 14 is interposed therebetween to release and dissipate heat generated from the plasma display panel 12. do. A front cover (not shown) is located outside the plasma display panel 12 and a rear cover (not shown) is located outside the chassis base 16, and these are combined to complete a plasma display device set.

The heat transfer sheet 14 according to the present embodiment is made of a porous material having a plurality of pores 14a therein. The porous heat transfer sheet 14 may be formed to have an open cell type structure, or may be formed to have a closed cell type structure. In the open cell structure, the pores 14a inside the porous heat transfer sheet 14 exist in a connected form, whereas in the open cell structure, the pores 14a inside the porous heat transfer sheet 14 are independent of each other.

When the porous heat transfer sheet 14 thus formed is attached to the surfaces of the plasma display panel 12 and the chassis base 16, the heat transfer sheet 14 and the plasma display panel 12 (or the chassis base 16) are attached. Since the air existing between the contact surface of the through through the pores (14a) can be significantly increased the seal area between the porous heat transfer sheet 14 and the plasma display panel 12 (or chassis base 16). In the case of using a conventional thermal conductive sheet or graphite thermal diffusion sheet of the silicon material, the actual adhesion rate was about 10 to 20%. When the porous heat transfer sheet 14 according to the present embodiment is applied, an adhesion rate of 50% or more can be obtained.

In the case of the porous heat transfer sheet 14, the surface area per unit volume in contact with air is large, and particularly in the open cell structure, gas is easily passed through the pores 14a connected to each other, so that heat generated in the plasma display panel 12 is conducted. Not only conduction but also convection can be diffused to the surroundings or discharged to the outside, resulting in improved heat dissipation efficiency.

In addition, due to the plurality of pores 14a formed therein, the porous heat transfer sheet 14 may have a buffering property and may protect the plasma display panel 12 by mitigating vibration or shock applied from the outside. In addition, the discharge noise generated in the plasma display panel 12 may be reduced while being absorbed while being converted into thermal energy in the pores 14a.

Referring to FIG. 2, the porous heat transfer sheet 14 is disposed adjacent to the chassis base facing surface of the plasma display panel 12, and the heat transfer sheet 14 is spaced apart from the chassis base 16 by a predetermined distance therebetween. Spaced apart from each other. The heat transfer sheet 14 is coated with a silicon-based or acrylic adhesive material on the panel attaching surface, and may be closely attached to one surface of the plasma display panel 12.

In addition, between the plasma display panel 12 and the chassis base 16, a double-sided adhesive member 15 is attached to each opposite surface to fix the plasma display panel 12 to the chassis base 16. Bar, this double-sided adhesive member 15 is disposed in a band shape along the edge of the heat transfer sheet (14). That is, the chassis base 16 has a substantially rectangular shape including a pair of long sides and a pair of short sides facing each other. The heat transfer sheet 14 also has a smaller rectangular shape than the chassis base 16. The double-sided adhesive member 15 may also be disposed outside the edge of the heat transfer sheet 14 to constitute at least one pair of long sides and at least one pair of short sides to surround the heat transfer sheet 14.

In the present embodiment, the thickness d _t of the double-sided adhesive member 15 is formed to be thicker than the thickness d _{s of the} heat transfer sheet 14, so that a predetermined distance between the heat transfer sheet 14 and the chassis base 16 may be reduced. g) is formed. A double-sided tape may be used as the double-sided adhesive member 15, but the scope of the present invention is not limited thereto.

By forming a gap g between the chassis base 16 and the heat transfer sheet 14, it is possible to induce natural convection of air through the heat transfer sheet 14 from the plasma display panel 12. Heat can be moved along the air stream passing through the gap g so that it can diffuse through the panel or be released to the outside.

Ventilation holes may be formed in the double-sided adhesive member 15 to allow suction and exhaust of external air, and the vent holes may be formed in at least one long side portion corresponding to upper and lower ends of the plasma display panel 12. Can be.

Meanwhile, a plurality of vent holes 16a may be formed in the chassis base 16 so that the air flow is more smoothly through the gap g between the heat transfer sheet 14 and the chassis base 16. have. The vent holes 16a may be arranged side by side along the long side and the short side of the chassis base 16, and may be formed in a group. The cross-sectional shape of the vent hole 16a may be formed as a polygon or a circle such as a square or a rectangle.

The porous heat transfer sheet 14 according to the present embodiment may be made of a metal material, and the material selected from the group consisting of aluminum, copper, silver, gold, iron, nickel, stainless steel, and brass having excellent thermal conductivity. Can be done. 3 is an inside measured photograph of a porous heat transfer sheet made of aluminum, and it can be seen that a plurality of pores exist in a form connected to each other.

In addition, the porous heat transfer sheet 14 may be formed of a material having anisotropic thermal conductivity, and includes carbon, graphite, carbon nanotubes, and carbon fibers. It may be made of a material selected from. The porous heat transfer sheet 14 made of such a material preferably has anisotropic thermal conductivity which is more excellent in planar thermal conductivity than the thickness direction thermal conductivity, and in this case, the planar thermal conductivity is higher than the thickness direction thermal conductivity in order to eliminate an afterimage. It is preferable that it is at least 5 times larger. 4 is an inside measured photo of a porous heat transfer sheet made of graphite, and it can be seen that a plurality of pores are present in a form connected to each other.

 The pores 14a of the porous heat transfer sheet 14 are preferably formed to fall in the range of 5 to 80 ppi (pore per inch). If the pore size is less than 5 ppi, it is difficult to obtain the afterimage removal effect, and if the pore size is more than 80 ppi, the air removal effect is deteriorated and the heat dissipation efficiency may deteriorate.

It is preferable to form pores 14a therein so that the porosity of the porous heat transfer sheet 14 is in a range of 35% to 95%. The porosity (n) is calculated as n = (V-Vs) / V × 100 (%) when Vs is the volume of the solid portion of the heat transfer sheet 14 and V is the total volume including the pores 14a. Can be. When the porosity of the porous heat transfer sheet 14 is less than 35%, not only the buffering property is lowered but also the air gap removal effect between the panel 12 and the heat transfer sheet 14 is weakened, and thus the adhesion rate is lowered. If it is more than 95%, the area of contact between the panel 14 surface and the heat transfer sheet 14 is small, so that the thermal conductivity is lowered, and it is difficult to remove the afterimage.

Hereinafter, a plasma display device according to the second and third embodiments of the present invention will be described. In each embodiment, the same components use the same reference numerals.

5 is a side sectional view showing a plasma display device according to a second embodiment of the present invention.

In the plasma display device according to the present embodiment, the heat transfer sheet 17 is formed by forming a porous aggregate in which a plurality of fibrous elements 17b are entangled with each other, and the heat transfer sheet 17 is formed of the plasma display panel 12. Interposed between the chassis bases 16 and disposed to be adjacent to one surface (chassis base facing surface) of the plasma display panel 12, and the chassis bases 16 may be spaced apart from each other with a predetermined distance (g) therebetween. Spaced apart. The heat transfer sheet 17 is coated with a silicon-based or acrylic adhesive on the panel attaching surface, and may be closely attached to one surface of the plasma display panel 12.

The double-sided adhesive member 15 positioned between the plasma display panel 12 and the chassis base 16 may be formed in the same manner as in the first embodiment, and a detailed description thereof will be omitted.

Pores 17a exist between the plurality of fibrous elements 17b constituting the heat transfer sheet 17. The heat transfer sheet 17 of the present embodiment configured as described above has the porous heat transfer sheet 14 described in the first embodiment. ), The actual adhesion area with the plasma display panel 12 (or chassis base 16) can be increased, the buffering properties and the noise properties are improved, and the improved heat dissipation efficiency can be obtained. Can be.

In addition, a plurality of ventilation holes 16a may be formed in the chassis base 16 so that the air flow is more smoothly through the gap g between the heat transfer sheet 17 and the chassis base 16. have. The vent holes 16a may be arranged side by side along the long side and the short side of the chassis base 16, and may be formed in a group. The cross-sectional shape of the vent hole 16a may be formed as a polygon or a circle such as a square or a rectangle.

Meanwhile, the fibrous elements 17b forming the heat transfer sheet 17 may be made of a metal material, and may be selected from a group including aluminum, copper, silver, gold, iron, nickel, stainless, and brass having excellent thermal conductivity. It may be made of a material.

In addition, the fibrous elements 17b may be made of a material having anisotropic thermal conductivity, and include carbon, graphite, carbon nanotubes, and carbon fibers. It may be made of a material selected from the group. The heat transfer sheet 17 made of such a material preferably has anisotropic thermal conductivity which is better in the planar thermal conductivity than the thickness direction thermal conductivity, and in this case, the planar thermal conductivity is at least greater than the thickness direction thermal conductivity in order to eliminate the afterimage. It is preferable that it is five times or more.

6 is a side sectional view showing a plasma display device according to a third embodiment of the present invention.

In the plasma display device according to the present exemplary embodiment, the heat transfer sheet 18 is formed by forming a porous aggregate while a plurality of flakes 18b are agglomerated with each other, and the heat transfer sheet 18 is formed of the plasma display panel 12 and the chassis. Interposed between the bases 16 and disposed adjacent to one surface (chassis base facing surface) of the plasma display panel 12, and spaced apart from the chassis base 16 at a predetermined interval g therebetween. Are arranged. The heat transfer sheet 18 is coated with a silicon-based or acrylic adhesive on the panel attaching surface, and may be closely attached to one surface of the plasma display panel 12.

The double-sided adhesive member 15 positioned between the plasma display panel 12 and the chassis base 16 may be formed in the same manner as in the first embodiment, and a detailed description thereof will be omitted.

Pores 18a exist between the plurality of flakes 18b constituting the heat transfer sheet 18, and the heat transfer sheet 18 of the present embodiment configured as described above has the porous heat transfer sheet 14 described in the first embodiment. As a result, it is possible to increase the actual adhesion area with the plasma display panel 12 (or chassis base 16), improve the buffering and noise properties, and obtain improved heat dissipation efficiency. have.

In addition, a plurality of ventilation holes 16a may be formed in the chassis base 16 so that the air flow is more smoothly through the gap g between the heat transfer sheet 18 and the chassis base 16. have. The vent holes 16a may be arranged side by side along the long side and the short side of the chassis base 16, and may be formed in a group. The cross-sectional shape of the vent hole 16a may be formed as a polygon or a circle such as a square or a rectangle.

Meanwhile, the flakes 18b forming the heat transfer sheet 18 may be made of a metal material, and a material selected from the group consisting of aluminum, copper, silver, gold, iron, nickel, stainless, and brass having excellent thermal conductivity. It may be made of.

In addition, the flakes 18b may be made of a material having anisotropic thermal conductivity, and include carbon, graphite, carbon nanotubes, and carbon fibers. It may be made of a material selected from. The heat transfer sheet 18 made of such a material preferably has anisotropic thermal conductivity which is more excellent in planar thermal conductivity than the thickness direction thermal conductivity, and in this case, the planar thermal conductivity is at least greater than the thickness direction thermal conductivity in order to eliminate the afterimage. It is preferable that it is five times or more.

Experimental Example

Meanwhile, referring to FIG. 7, the plasma display panel 12 lasts 20 minutes in a full white pattern on the screen of the plasma display panel 12, and lasts for 3 minutes in a 3% window pattern (indicated by “A” in the drawing). By switching to the white pattern, the degree of bright afterimage can be measured by measuring the time until the luminance difference between the area A and the surrounding area B within the window pattern is within 7 cd / m 2.

As a comparative example, a silicon material sheet having a thickness of 1.5 mm was used, and the residual image retention time and the panel surface temperature were measured using the graphite material porous heat transfer sheet according to the first embodiment. . In the plasma display panel used for the experiment, a heat transfer sheet having a porosity of 60% and a thickness of 2 mm was applied to a 42-inch panel, and the distance between the chassis base and the chassis base was 2 mm.

Item Example Comparative example Initial luminance difference [cd / ㎡]: After 30 seconds 9 22 Afterimage time [sec]: Based on 7cd / ㎡ 50 170 Panel surface temperature [℃] 53 64

As shown in Table 1, in the case of the comparative example, the afterimage time, which is the reference point for measuring the degree of bright afterimage, is 170 seconds, whereas in the example, it can be seen that it is 50 seconds.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

As described above, according to the plasma display device according to the present invention, a porous heat transfer sheet having a plurality of pores therein is disposed adjacent to the plasma display panel as a heat source, thereby increasing the actual contact area between the panel and the heat transfer sheet, thereby generating the panel. It is possible to quickly diffuse and release the heat.

The porous heat transfer sheet has a large surface area per unit volume in contact with air, and particularly in the open cell structure, gas is easily passed through the interconnected pores, so that the heat generated in the panel is not only caused by conduction but also by convection. As it can be diffused to the outside or released to the outside, improved heat dissipation efficiency can be obtained.

In addition, by spacing a predetermined interval between the chassis base and the heat transfer sheet, it is possible to spread and dissipate heat generated locally by natural convection effect through air circulation, and furthermore, by forming a plurality of vent holes in the chassis base, It is possible to further improve the heat dissipation effect.

On the other hand, by applying a porous heat transfer sheet formed of a material having an anisotropic thermal conductivity it can be alleviated the problem caused by the afterimage effect.

In addition, since the heat transfer sheet according to the present invention is easily detached from the panel, it is possible to recycle during the manufacturing process or repair process.

Claims (29)

A plasma display panel; A chassis base disposed in parallel with one surface of the plasma display panel; A porous heat transfer sheet interposed between the plasma display panel and the chassis base and having a plurality of pores therein; And A double-sided adhesive member disposed between the plasma display panel and the chassis base and bonded to opposite surfaces of the plasma display panel and the chassis base while being disposed along an edge of the porous heat transfer sheet; The porous heat transfer sheet is disposed adjacent to one surface of the plasma display panel, The thickness of the double-sided adhesive member is formed to be thicker than the thickness of the porous heat transfer sheet and the plasma display device disposed to be spaced apart at a predetermined interval between the porous heat transfer sheet and the chassis base. The method of claim 1, And the porous heat transfer sheet is closely attached to one surface of the plasma display panel. The method of claim 1, The porous heat transfer sheet has an open cell type structure in which pores therein are connected to each other. The method of claim 1, The porous heat transfer sheet has a closed cell type structure in which pores therein are independently present. The method of claim 1, The size of the pores present in the porous heat transfer sheet is in the range of 5 to 80 ppi. The method of claim 1, And a porosity of the porous heat transfer sheet is in a range of 35% to 95%. The method of claim 1, The porous heat transfer sheet is a plasma display device made of a metal material. The method of claim 7, wherein And the porous heat transfer sheet is made of a material selected from the group consisting of aluminum, copper, silver, gold, iron, nickel, stainless steel and brass. The method of claim 1, And the porous heat transfer sheet is made of a material having anisotropic thermal conductivity in which planar thermal conductivity is greater than thickness direction thermal conductivity. The method of claim 9, And a planar thermal conductivity of said porous heat transfer sheet is at least five times greater than a thickness direction thermal conductivity. The method of claim 9, The porous heat transfer sheet is a plasma display device comprising a material selected from the group consisting of carbon, graphite, carbon nanotubes, and carbon fibers. delete The method of claim 1, And a plurality of vent holes are formed in the chassis base. The method of claim 13, The chassis base is formed in a substantially rectangular shape including a pair of long sides and a pair of short sides facing each other, Vent holes formed in the chassis base are arranged side by side along the long side and the short side. A plasma display panel; A chassis base disposed in parallel with one surface of the plasma display panel; And A porous heat transfer sheet interposed between the plasma display panel and the chassis base and having a plurality of pores therein; The porous heat transfer sheets are disposed adjacent to one surface of the plasma display panel, and are spaced apart from the chassis base at a predetermined interval therebetween. And a plurality of vent holes formed in the chassis base so as to communicate with a space between the chassis base and the porous heat transfer sheet. delete delete delete delete The method of claim 15, The chassis base is formed in a substantially rectangular shape including a pair of long sides and a pair of short sides facing each other, Vent holes formed in the chassis base are arranged side by side along the long side and the short side. The method according to claim 1 or 15, The porous heat transfer sheet is a plasma display device is formed by forming a porous aggregate while a plurality of flakes (lump) agglomerated with each other. The method of claim 21, The flakes are plasma display device made of a metal material. The method of claim 21, The flakes are made of a material selected from the group consisting of carbon, graphite, carbon nanotubes, carbon fibers. delete delete delete The method according to claim 1 or 15, The porous heat transfer sheet is a plasma display device in which a plurality of fibrous elements (entangled with each other) is formed to form a porous aggregate. The method of claim 27, And the fibrous elements are made of metal. The method of claim 27, The fibrous element is a display device made of a material selected from the group consisting of carbon, graphite, carbon nanotubes, carbon fibers.

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