KR100627264B1 - 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 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. In this case, the heat transfer sheet includes a first sheet member adjacent to one surface of the plasma display panel and a second sheet member adjacent to one surface of the chassis base, wherein the first sheet member is mutually different from the second sheet member. Have pores of different sizes. In particular, the pore size of the second sheet member may be larger than the pore size of the first sheet member, and the porosity of the second sheet member may be larger than that of the first sheet member.

Plasma, heat dissipation, porosity, porosity, porosity

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.

2 is a partial side cross-sectional view taken along the line A-A of 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 plan sectional view showing a plasma display device according to a second embodiment of the present invention.

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

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

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

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 its object is to attach a porous heat transfer sheet to a display panel as a main heat source, thereby widening the real contact area with the panel and rapidly moving and diffusing heat generated from the panel. It is to provide a plasma display device that can be.

Another object of the present invention is to provide a plasma display device capable of maximizing thermal diffusion and heat dissipation efficiency by different porosities of the porous heat transfer sheet adjacent to the panel and the porous heat transfer sheet adjacent to 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. In this case, the heat transfer sheet includes a first sheet member adjacent to one surface of the plasma display panel and a second sheet member adjacent to one surface of the chassis base, wherein the first sheet member is mutually different from the second sheet member. Have pores of different sizes.

The pore size of the second sheet member can be made larger than the pore size of the first sheet member, wherein the size of the pores present in the first sheet member is in the range of 40 to 80 ppi, The size of the pores present in the second sheet member is preferably in the range of 5 to 40 ppi.

In addition, the porosity of the first sheet member may be made smaller than the porosity of the second sheet member, wherein the porosity of the first sheet member is in the range of 35 to 50%, the second sheet member The porosity is preferably in the range of 60 to 95%.

The heat transfer sheet may be closely attached to one surface of the plasma display panel.

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

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

In addition, the heat transfer sheet may be made of a material having anisotropic thermal conductivity in which the planar thermal conductivity is greater than the thickness direction thermal conductivity, and the planar thermal conductivity is preferably at least five times greater than the thickness direction thermal conductivity.

The heat transfer sheet may be made of a material selected from the group consisting of carbon, graphite, carbon nanotubes, and carbon fibers.

Meanwhile, the heat transfer sheet may have at least one air flow channel extending from one edge to the opposite edge, wherein the chassis base includes a pair of long sides and a pair of short sides facing each other. When made of a phase, the air flow channel formed in the heat transfer sheet is continued along the direction parallel to the short side of the chassis base.

The air distribution channel may be formed by forming a groove on a surface of the heat transfer sheet and having a polygonal cross section.

In addition, the chassis base may have a corresponding channel formed in a portion corresponding to the air distribution channel, and the corresponding channel may be formed to face the air distribution channel.

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 display panel. 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. In each case, the heat transfer sheet includes a first sheet member adjacent to one surface of the plasma display panel and a second sheet member adjacent to one surface of the chassis base, wherein the first sheet member includes the second sheet member. And having pores of different sizes, it is preferable that the pore size of the second sheet member is larger than the pore size of the first sheet member.

In this case, 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.

The size of the pores present in the first sheet member may be formed to be in the range of 40 to 80 ppi, the size of the pores present in the second sheet member may be formed to be in the range of 5 to 40 ppi. have.

In addition, the porosity of the first sheet member may be made smaller than the porosity of the second sheet member, wherein the porosity of the first sheet member is in the range of 35 to 50%, the second sheet member The porosity is preferably in the range of 60 to 95%.

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 partial side cross-sectional view taken along the line A-A of FIG.

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 the circuit unit 19 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 formed as described above 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 surfaces of the s) escapes through the pores 14a, the seal adhesion area between the porous heat transfer sheet 14 and the plasma display panel 12 (or chassis base 16) may be greatly increased. . 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. As the discharge noise generated in the plasma display panel 12 is absorbed while being converted into thermal energy in the pores 14a, noise can be reduced.

Meanwhile, the heat transfer sheet 14 according to the present embodiment may include a first sheet member 14A adjacent to one surface of the plasma display panel 12 and a second sheet member 14B adjacent to one surface of the chassis base 16. It is made by joining each other. At this time, the first sheet member 14A and the second sheet member 14B are different in the size of the pores 14a and 14b, and thus, the first sheet member 14A and the second sheet member 14B are different from each other in size. The pores 14b of the sheet member 14B are larger in size.

That is, by forming the pores formed in the first sheet member 14A adjacent to the panel 12 to a small size so as to fall within the range of 40 to 80 ppi (pore per inch), the air layer during adhesion with the panel 12 It is possible to increase the actual contact area with the panel 12 while eliminating the above, and also to quickly diffuse / dissipate heat generated in the panel 12 when driving the device, which can be advantageous to remove the afterimage.

And by forming the pores formed in the second sheet member 14B adjacent to the chassis base 16 to a size larger than the first sheet member 14A so as to fall in the range of 5 to 40 ppi, the chassis base ( 16) Good air flow in adjacent areas can increase heat dissipation effect by convection in addition to heat dissipation effect by conduction.

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.

The heat transfer sheet 14 according to the present embodiment may also be formed by combining sheet members having different porosities. That is, the porosity of the first sheet member 14A may be smaller than that of the second sheet member 14B. At this time, the porosity of the first sheet member 14A may be in the range of 35 to 50%, and the porosity of the second sheet member 14B may be in the range of 60 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. , When it is more than 95%, the contact area 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.

In this manner, the first sheet member 14A removes the air layer during adhesion with the panel 12, thereby increasing the actual contact area with the panel 12, and also rapidly dissipates heat generated in the panel 12 when the device is driven. / Can be advantageous to remove the afterimage, and by adjoining the second sheet member (14B) to the chassis base (16) to improve the air flow in the adjacent area, the heat dissipation effect by convection in addition to the heat dissipation effect by conduction Can be increased.

Between the plasma display panel 12 and the chassis base 16 is a double-sided adhesive member 15 is attached to each opposite surface to fix the plasma display panel 12 to the chassis base 16, The double-sided adhesive member 15 is disposed in a band shape along the edge of the heat transfer sheet 14. Optionally, the heat transfer sheet 14 may be attached and fixed directly to the plasma display panel 12 or the chassis base 16 by adding a silicone or acrylic adhesive to the surface without using the double-sided adhesive member 15 as described above. It may be.

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 porous heat transfer sheet 14 according to the present embodiment may be manufactured by foaming the above-described materials. In order to have pores of different sizes or porosities of different sizes, one side (second sheet member 14B when foaming materials) The corresponding part) gives sufficient space to expand and the other side (part corresponding to the first sheet member 14A) suppresses the expansion, so that the expanding part has a large porosity, thereby forming different porosities on both sides. Can be.

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

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

In the heat transfer sheet 24 according to the present embodiment, the first sheet member 24A adjacent to one surface of the plasma display panel 12 and the second sheet member 24B adjacent to one surface of the chassis base 16 are bonded to each other. It is done by At this time, the first sheet member 24A and the second sheet member 24B are different in the size of the pores, so that the pores of the second sheet member 24B are larger than the size of the pores of the first sheet member 24A. The size is made larger.

In addition, the second sheet member 24B constituting the heat transfer sheet 24 is formed with an air distribution channel 25 extending from one edge to the opposite edge, and the air distribution channel 25 includes a second sheet member ( A groove is formed on the surface of the chassis base 16 side of 24B, and has a substantially rectangular cross section. However, the cross section of the air distribution channel 25 is not limited thereto and may have a shape such as a circle, an ellipse, a semicircle, as well as a polygonal shape other than a rectangle.

The air distribution channel 25 formed in this way extends along the direction parallel to the short side of the chassis base 16, and each of the air distribution channels 25 is adjacent to each other side by side to the second sheet member 24B. Is placed on.

The heat transfer sheet 24 according to the present embodiment may also be formed by combining sheet members having different porosities. That is, the porosity of the first sheet member 24A may be smaller than the porosity of the second sheet member 24B.

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

In the heat transfer sheet 28 according to the present exemplary embodiment, the first sheet member 28A adjacent to one surface of the plasma display panel 12 and the second sheet member 28B adjacent to one surface of the chassis base 16 are bonded to each other. It is done by At this time, the first sheet member 28A and the second sheet member 28B differ from each other in the size of the pores, so that the pores of the second sheet member 28B are larger than the size of the pores of the first sheet member 28A. The size is made larger.

The second sheet member 28B of the heat transfer sheet 28 according to the present embodiment, like the second sheet member 28B of the heat transfer sheet 28 in the second embodiment, extends from one side edge to the opposite side edge. The air flow channel 29 is formed by forming grooves on the chassis base 26 side surface of the second sheet member 28B and having a substantially rectangular cross section.

Meanwhile, in the present embodiment, the chassis base 26 has a corresponding channel 26a formed at a portion corresponding to the air distribution channel 29. As shown in FIG. 6, the corresponding channel 26a may be formed by forming a groove on the surface of the chassis base 26 opposite to the second sheet member 28B. 26a) may be formed to face the air flow channel 29.

The heat transfer sheet 28 according to the present embodiment may also be formed by combining sheet members having different porosities. That is, the porosity of the first sheet member 28A may be smaller than the porosity of the second sheet member 28B.

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

In the plasma display apparatus according to the present exemplary embodiment, the heat transfer sheet 37 is formed by forming a porous aggregate while a plurality of fibrous elements 37a and 37b are entangled with each other, and the heat transfer sheet 37 is a plasma display panel 12. ) And the chassis base 16 are disposed to be adjacent to one surface of the plasma display panel 12. The heat transfer sheet 37 is formed by bonding the first sheet member 37A adjacent to one surface of the plasma display panel 12 and the second sheet member 37B adjacent to one surface of the chassis base 16 to each other. At this time, the first sheet member 37A and the second sheet member 37B are different in the size of the pores, so that the pores of the second sheet member 37B are larger than the size of the pores of the first sheet member 37A. The size is made larger. That is, this can be realized by making the coupling between the fibrous elements 37a constituting the first sheet member 37A more tightly than the coupling between the fibrous elements 37b constituting the second sheet member 37B.

The double-sided tape 15 may be attached along the edge of the heat transfer sheet 37 between the plasma display panel 12 and the chassis base 16 to secure the position of the heat transfer sheet 37. Optionally, an adhesive may be added to the surface of the heat transfer sheet 37 to directly attach and fix the plasma display panel 12 or the chassis base 16.

Pores exist between the plurality of fibrous elements 37a and 37b constituting the heat transfer sheet 37. The heat transfer sheet 37 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.

On the other hand, the fibrous elements (37a, 37b) forming the heat transfer sheet 37 may be made of a metal material, in the group containing aluminum, copper, silver, gold, iron, nickel, stainless, brass having excellent thermal conductivity It may be made of a material selected.

In addition, the fibrous elements 37a and 37b may be made of a material having anisotropic thermal conductivity, and may include carbon, graphite, carbon nanotube, and carbon fiber. It may be made of a material selected from the group containing. The heat transfer sheet 37 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.

On the other hand, the heat transfer sheet 37 according to the present embodiment may also be made by combining the sheet members having different porosity. That is, the porosity of the first sheet member 37A may be smaller than that of the second sheet member 37B.

In addition, in the second sheet member 37B constituting the heat transfer sheet 37, as in the second embodiment, an air distribution channel extending from one edge to the opposite edge may be formed. As in, corresponding channels may be formed in the chassis base 16 to further improve air flow.

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

In the plasma display apparatus according to the present exemplary embodiment, the heat transfer sheet 38 is formed by forming a porous aggregate as a plurality of flakes 38a and 38b are agglomerated with each other, and the heat transfer sheet 38 is formed by the plasma display panel 12. Interposed between the chassis base 16 and the chassis base 16 to be adjacent to one surface of the plasma display panel 12. The heat transfer sheet 38 is formed by bonding the first sheet member 38A adjacent to one surface of the plasma display panel 12 and the second sheet member 38B adjacent to one surface of the chassis base 16 to each other. At this time, the first sheet member 38A and the second sheet member 38B are different in the size of the pores, so that the pores of the second sheet member 38B are larger than the size of the pores of the first sheet member 38A. The size is made larger. That is, this can be realized by making the coupling between the fibrous elements 38a constituting the first sheet member 38A more tightly than the coupling between the flakes 38b constituting the second sheet member 38B.

 The double-sided tape 15 may be attached along the edge of the heat transfer sheet 38 between the plasma display panel 12 and the chassis base 16 to secure the position of the heat transfer sheet 17. Optionally, an adhesive may be added to the surface of the heat transfer sheet 38 to directly attach and fix the plasma display panel 12 or the chassis base 16.

Pores are present between the plurality of flakes 38a and 38b constituting the heat transfer sheet 38, and the heat transfer sheet 38 of the present embodiment configured as described above is formed of the porous heat transfer sheet 14 described in the first embodiment. As a result, the actual adhesion area with the plasma display panel 12 (or chassis base 16) can be increased, the buffering properties and the noise performance can be improved, and improved heat dissipation efficiency can be obtained. .

On the other hand, the flakes (38a, 38b) forming the heat transfer sheet 38 may be made of a metal material, it is selected from the group containing aluminum, copper, silver, gold, iron, nickel, stainless, brass having excellent thermal conductivity. It can be made of a material.

In addition, the flakes 38a and 38b 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 38 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.

On the other hand, the heat transfer sheet 38 according to the present embodiment may also be made by combining sheet members having different porosities. That is, the porosity of the first sheet member 38A may be smaller than that of the second sheet member 38B.

In addition, in the second sheet member 38B constituting the heat transfer sheet 38, as in the second embodiment, an air distribution channel extending from one edge to the opposite edge may be formed. As in, corresponding channels may be formed in the chassis base 16 to further improve air flow.

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.

In particular, a sheet member having different pore sizes (or porosities) is disposed in a portion adjacent to the panel and adjacent to the chassis base, so that the sheet member having smaller pores is adjacent to the panel. By adjoining the sheet member having large pores to the chassis base, the sheet member increases the actual contact area with the panel while eliminating the air layer when adhering to the panel, and also rapidly diffuses / discharges heat generated from the panel when the device is driven. It can be advantageous to remove afterimage, and can improve the air flow in the vicinity of the chassis base to increase the heat dissipation effect by convection in addition to the heat dissipation effect by conduction.

In addition, by forming an air flow channel extending from one side edge to the opposite side edge of the heat transfer sheet, it is possible to smoothly distribute the air and to spread and dissipate heat generated locally by the natural convection effect.

In addition, by forming an air distribution channel in the chassis base, it is possible to further enhance the heat diffusion and heat dissipation effect by natural convection.

Claims (31)

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; And A double-sided adhesive member attached along an edge of the heat transfer sheet to attach the plasma display panel to the chassis base; Including, The heat transfer sheet includes a first sheet member adjacent to one surface of the plasma display panel and a second sheet member adjacent to one surface of the chassis base, The size of the pores of the second sheet member is larger than the size of the pores of the first sheet member. delete The method of claim 1, The size of the pores present in the first sheet member is in the range of 40 to 80 ppi. The method of claim 1, The size of the pores present in the second sheet member is in the range of 5 to 40 ppi. The method of claim 1, And a porosity of the first sheet member is smaller than that of the second sheet member. The method of claim 5, The porosity of the first sheet member is in the range of 35 to 50%. The method of claim 5, And a porosity of the second sheet member is in a range of 60 to 95%. The method according to any one of claims 1 and 3 to 7, And the heat transfer sheet is closely attached to one surface of the plasma display panel. The method according to any one of claims 1 and 3 to 7, And the heat transfer sheet has an open cell type structure in which pores therein are connected to each other. The method according to any one of claims 1 and 3 to 7, The heat transfer sheet has a closed cell type structure in which pores therein are independently present. The method according to any one of claims 1 and 3 to 7, And the heat transfer sheet is made of a metal material. The method of claim 11, And the heat transfer sheet is formed of a material selected from the group consisting of aluminum, copper, silver, gold, iron, nickel, stainless steel, and brass. The method according to any one of claims 1 and 3 to 7, And the 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 13, And a planar thermal conductivity of said heat transfer sheet is at least five times greater than a thickness direction thermal conductivity. The method of claim 13, The heat transfer sheet is a plasma display device made of a material selected from the group consisting of carbon, graphite, carbon nanotubes, and carbon fibers. The method according to any one of claims 1 and 3 to 7, And at least one air flow channel formed on the heat transfer sheet from one edge to the opposite edge. The method of claim 16, 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, The air flow channel formed in the heat transfer sheet extends along a direction parallel to the short side portion of the chassis base. The method of claim 16, The air flow channel is formed by forming grooves in the groove (groove) on the surface of the heat transfer sheet. The method of claim 16, The air distribution channel has a polygonal cross section. The method of claim 16, And a corresponding channel is formed in a portion of the chassis base corresponding to the air distribution channel. The method of claim 20, The air flow channel is formed by forming grooves in the grooves on the surface of the heat transfer sheet, the corresponding channel formed in the chassis base is formed so as to face the air flow channel. A plasma display panel; A chassis base disposed in parallel with one surface of the plasma display panel; And A heat transfer sheet interposed between the plasma display panel and the chassis base, the plurality of fibrous elements being entangled with each other to form a porous aggregate; And A double-sided adhesive member attached along an edge of the heat transfer sheet to attach the plasma display panel to the chassis base; Including, The heat transfer sheet includes a first sheet member adjacent to one surface of the plasma display panel and a second sheet member adjacent to one surface of the chassis base, The size of the pores of the second sheet member is larger than the size of the pores of the first sheet member. delete The method of claim 22, And a porosity of the first sheet member is smaller than that of the second sheet member. The method of claim 22 or 24, And the fibrous elements are made of metal. The method of claim 22 or 24, The fibrous element is a display device made of a material selected from the group consisting of carbon, graphite, carbon nanotubes, carbon fibers. A plasma display panel; A chassis base disposed in parallel with one surface of the plasma display panel; A heat transfer sheet interposed between the plasma display panel and the chassis base, wherein the porous heat transfer sheet is formed by forming a porous aggregate while a plurality of flakes are agglomerated with each other; And A double-sided adhesive member attached along an edge of the heat transfer sheet to attach the plasma display panel to the chassis base; Including, The heat transfer sheet includes a first sheet member adjacent to one surface of the plasma display panel and a second sheet member adjacent to one surface of the chassis base, The size of the pores of the second sheet member is larger than the size of the pores of the first sheet member. delete The method of claim 27, And a porosity of the first sheet member is smaller than that of the second sheet member. The method of claim 27 or 29, The flakes are plasma display device made of a metal material. The method of claim 27 or 29, The flakes are made of a material selected from the group consisting of carbon, graphite, carbon nanotubes, carbon fibers.

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