KR20050093193A - Graphite radiation sheet for plasma display panel - Google Patents

Abstract

The present invention provides a coating of a coating material such as UV on a graphite heat dissipation sheet to minimize problems that may occur in handling such as breakage or damage when manufacturers and producers assemble to construct a heat dissipation mechanism. Graphite) It is characterized by preventing the surface of the heat dissipation sheet from being contaminated by foreign matter and providing graphite so that it does not contaminate the body such as the hands of manufacturers and producers during assembly.

In addition, the present invention minimizes the surface peeling phenomenon that the graphite surface falls off like the adhesive liquid when peeling the release paper in the state where the adhesive liquid is applied, and at the same time improve the overall efficiency to use the heat dissipation mechanism When to provide manufacturers and producers to maximize the satisfaction and reliability of use.

To this end, the present invention PDP graphite (Graphite) heat dissipation sheet is a pressure-sensitive adhesive is applied to the surface of one side of the graphite layer made of graphite, the release paper is covered on the surface of the pressure-sensitive adhesive solution applied above, the other side of the graphite layer On the surface, a coating layer such as UV, urethane or silicone is thinly coated so that graphite does not form during PDP assembly work by a manufacturer or a producer, and a heat dissipation sheet for PDP is used between the graphite layer and the applied adhesive. In order to remove the release paper in order to prevent the graphite (Plate) surface peeling phenomenon that the surface of the graphite layer falls off like an adhesive liquid is made by coating a thin coating layer such as UV, urethane or silicon.

Description

Graphite heat dissipation sheet for PDPD {GRAPHITE RADIATION SHEET FOR PLASMA DISPLAY PANEL}

The present invention relates to a graphite heat dissipation sheet for efficiently applying thermal conductivity by applying to a plasma display panel (PDP),

More specifically, the PDP graphite is disposed between the plasma glass and the heat spreader in the PDP composition, and the plasma glass efficiently conducts heat generated by gas discharge in the plasma glass. It relates to a heat radiation sheet.

In general, PDP (Plasma Display Panel) is a device for displaying an image by using plasma generated by gas discharge. This uses flat glass, so that the screen is not refracted like the CRT and there is no distortion. A thin monitor with a thickness of 15 cm or less can be made, enabling a light wall-mounted TV.

In addition, the PDP has a narrow viewing angle, which is a disadvantage of LCD, so that it can be viewed without deterioration in the range of more than 160 degrees, and according to these advantages, each company is developing PDP as a flagship product, but most companies The research is mainly conducted on the improvement of the image quality and the manufacture of plasma glass.

When the maximum allowable operating temperature of the plasma glass is 90 ° C. or lower, and the temperature difference between the fluorescent region (discharge region) and the non-fluorescence region (non-discharge region) is 10 ° C. or more, cracking occurs in the plasma glass, and the PDP using the plasma light source is High voltage / high current is generated in the 42-inch model, for example, about 350W of heat is generated.

In addition, the PDP, which has to be implemented with a slim thin structure, has a poor thermal environment due to the narrower structure than the previous CRT display, and a fan is frequently used as a cooling device of the PDP, but the PDP thickness is slim. As it is the biggest obstacle to thinning and has problems such as noise, weight increase, and power consumption, recently, a 'powerless' cooling device in which a fan is not used in the PDP has been required. The high efficiency heat spreader which can spread | diffuse and generate the heat which generate | occur | produces rapidly to a low temperature part is used.

That is, the conventional PDP is composed of a front glass, a plasma glass, a radiation sheet, a heat spreader, a printed circuit board (PCB), and a back cover (Back). cover).

The front glass is a front surface of the PDP where the gaseous plasma discharged from the plasma glass is displayed in letters or graphics, and outside air is provided through a vent formed in the lower portion of the front glass. It enters and circulates inside the PDP, transferring heat out.

The plasma glass is composed of a number of wires intersecting the inside of the glass, where gas discharge occurs and heat is generated. This is a main heating element in the PDP. If the cooling of this part is not performed properly, cracking occurs. Done.

The radiation sheet is a material having a strong adhesiveness and serves to contact the plasma glass and the heat spreader.

The heat spreader (Heat Spreader) is a main cooling device that heat generated from the plasma glass is transferred to the outside air by natural convection, which serves to support the PCB and the back cover is installed and fixed in addition to .

The back cover (Back cover) is to protect the inside of the PDP, the upper and lower is provided with a number of vents to allow the cooling air to enter the inside of the PDP.

As such, the PDP generates heat during operation, and the role of cooling or transferring the generated heat to the outside is very important.

In particular, the heat dissipation sheet located between the plasma glass and the heat spreader should be excellent in thermal conductivity in addition to the role of simply bonding them.

Conventionally, the heat radiation sheet is made of a rubber (Rubber) series, such as silicon, but in this case there is a limit to improve the thermal conductivity because it must be produced by combining the rubber (binder) and the excellent thermal conductivity powder, In order to overcome these limitations, the PDP heat dissipation sheet is being converted into a graphite (Graphite) material having excellent thermal conductivity.

However, the heat dissipation sheet made of graphite has excellent thermal conductivity, but there are problems in handling such as breakage or damage when the manufacturer and the producer assemble the PDP to construct the heat dissipation mechanism.

That is, the heat dissipation sheet made of graphite among the heat dissipation sheets conventionally performed is formed in a sheet state by foaming graphite having a flake structure and being rolled with a strong force. When peeling the release paper in the coated state there is a problem that the surface peeling phenomenon occurs that the surface is separated like the adhesive liquid.

In addition, the heat dissipation sheet made of graphite has a problem that the surface is easily contaminated unless the surroundings of the operator is required during handling, and the edge or the edge of the heat dissipation sheet is easily damaged because of its weak strength.

Therefore, due to the above problems, the rubber-based heat dissipation sheet or the heat dissipation sheet which is simply made of graphite has a limitation in efficiency in use to some extent, and economic loss caused by damage and damage in handling. This is aggravated, there is always a problem that the overall satisfaction and reliability of the use is impaired.

The present invention has been made to solve the problems of the graphite (Graphite) heat dissipation sheet of the prior art as described above has the following object.

The present invention allows the graphite heat dissipation sheet to coat a paint such as UV to prevent problems such as breakage or damage when the manufacturer and producer assemble the PDP to construct the heat dissipation mechanism. The purpose of the present invention is to provide a graphite heat dissipation sheet for PDP that minimizes the surface of the heat dissipation sheet from being contaminated by foreign substances and prevents graphite from contaminating a body such as the hands of manufacturers and producers during assembly. have.

Another object of the present invention is to prevent the surface peeling phenomenon that the surface is separated like the adhesive when peeling off the release paper in the state in which the adhesive is applied, and at the same time to improve the overall efficiency when constructing a heat dissipation mechanism using the same It is to provide a graphite heat dissipation sheet for PDP to maximize the satisfaction and reliability of use to manufacturers and producers.

PDP graphite heat dissipation sheet for achieving the object of the present invention is coated with a pressure-sensitive adhesive on one surface of the graphite layer made of graphite, the release paper is covered on the surface of the pressure-sensitive adhesive applied above, On the other surface of the graphite layer, a coating layer such as UV, urethane or silicon is thinly coated to prevent the graphite from being deposited by the manufacturer and the manufacturer, and between the graphite layer and the coated adhesive liquid, In order to use the heat dissipation sheet for the release sheet, the coating layer such as UV, urethane or silicone is thinly coated to prevent the surface peeling phenomenon that the surface of the graphite layer falls off like the adhesive liquid when peeling off.

Hereinafter, an embodiment for achieving the above object of the present invention will be described in detail.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, the terms to be described below are terms set in consideration of functions in the present invention, which may vary depending on the intentions or customs of manufacturers and producers, and their definitions should be made based on the contents throughout the specification.

First, as shown in the accompanying drawings, FIGS. 1 to 10, FIG. 1 is an exemplary configuration diagram schematically illustrating the present invention, and FIG. 2 is an exemplary cross-sectional configuration diagram illustrating the present invention. 3 is another embodiment cross-sectional configuration according to the invention, Figure 4 is another embodiment cross-sectional configuration according to the present invention, Figure 5 is a coating layer, adhesive liquid and release paper formed on both surfaces of the graphite layer according to the present invention Figure 6 is an exemplary view of the state, Figure 6 is an exemplary view for explaining the corners and the edge portion of the heat dissipation sheet carried out by the present invention, Figure 7 is an exemplary view for explaining the release paper carried out by the present invention, Figure 8 7 is an exemplary cross-sectional view for showing the release paper according to FIG. 7 in detail, FIG. 9 is an exemplary view showing the difference between the graphite layer area and the adhesive liquid area according to the present invention, and FIG. Shows an exemplary view for explaining a state in which a powder having excellent thermal conductivity is mixed with the coating layer.

That is, the present invention is applied to the plasma display panel (PDP) to apply the heat dissipation function for the purpose of applying the adhesive liquid 20 to the surface of one side of the graphite layer 10 made of graphite, the adhesive applied above In the PDP graphite heat dissipation sheet, in which the release paper 30 is covered on the surface of the liquid 20, on the other surface of the graphite layer 10 of the PDP graphite heat dissipation sheet 1 by a manufacturer and a producer, The coating layer 40, such as UV, urethane, or silicon, is thinly coated so that graphite does not form.

In addition, between the graphite layer 10 and the coated adhesive liquid 20, the surface of the graphite layer 10 is separated from the release paper 30 in order to use the graphite heat dissipation sheet 1 for the PDP. 20) by coating a thin coating layer 41, such as UV, urethane or silicone so as not to peel off the surface peeling phenomenon occurs.

In addition, the paint layer 41 such as UV, urethane, or silicon is formed between the graphite layer 10 and the coated adhesive liquid 20, and the paint layer 40 is on the other side of the graphite layer 10. It is made by thin coating to be formed on the surface.

In addition, on both surfaces of the graphite layer 10 formed on the graphite heat dissipation sheet 1 for the PDP, paint layers 40 and 41 such as UV, urethane, or silicon are formed by thin coating, respectively. Adhesive liquids 20 and 21 are applied to the coated paint layers 40 and 41, and release papers 30 and 31 are covered with the coated adhesive liquids 20 and 21.

Each corner 1a and the cut edge 1b of the graphite heat dissipation sheet 1 for the PDP are processed by rounding or chamfering to minimize breakage such as breakage that may occur during use and handling.

In addition, the cut surface of the graphite heat dissipation sheet 1 for the PDP is formed by rounding or chamfering.

The area of the release paper 30 is adhered to the graphite layer 10 formed on the graphite heat dissipation sheet 1 for the PDP in order to facilitate the peeling operation of the release paper and facilitate automation by manufacturers and producers who manufacture and produce the PDP. It is made larger than the area of the liquid 20.

In addition, the area of the adhesive liquid 20 coated on one surface of the graphite layer 10 may be damaged by the edge surface portion that is most damaged among the portions where the surface of the graphite layer is damaged by the adhesive liquid when peeling off the release paper 30. It is made to form less than the area of the graphite layer 10 to prevent.

In order to improve the thermal conductivity of the graphite heat dissipation sheet 1 for the PDP, the paint layers 40 and 41 are formed by mixing the excellent thermal conductivity powder 50 made of a material such as aluminum, copper, and graphite.

On the other hand, in the PDP graphite heat dissipation sheet according to the present invention can be variously modified and can take various forms.

It is to be understood, however, that the present invention is not limited to the specific forms referred to in the above description, but rather includes all modifications, equivalents and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood to do.

First, the graphite heat dissipation sheet 1 of the present invention having the above configuration is applied to a plasma display panel (PDP) to improve thermal conductivity.

To this end, the graphite heat dissipation sheet 1 for the PDP, as shown in the accompanying drawings, Figures 1 and 2, a graphite layer 10 made of graphite is formed, one surface of the graphite layer 10 of the PDP A pressure sensitive adhesive 20 is applied to easily adhere to another member (not shown), and the surface of the pressure sensitive adhesive 20 is formed into one article before adhering to the other member through the pressure sensitive adhesive 20. Release paper 30 is covered.

At this time, the other surface of the graphite layer 10 is made by coating a thin coating layer 40, such as UV, urethane or silicon, which prevents graphite from being buried during assembly of the PDP by the manufacturer and the manufacturer. It is for preventing the damage of the graphite layer 10 in advance.

In addition, as shown in Figure 3, this is another embodiment of the present invention, the coating layer 41, such as UV, urethane or silicon between the graphite layer 10 and the applied adhesive liquid (20) It is made of a thin film, which is the surface of the graphite layer 10 falls off with the adhesive liquid 20 when peeling the release paper 30 to attach the graphite heat dissipation sheet 1 for the PDP to another member The phenomenon of surface peeling is prevented in advance.

In addition, as shown in FIG. 4, a coating layer 41 such as UV, urethane, or silicon may be formed between the graphite layer 10 and the coated adhesive liquid 20, and at the same time, the graphite layer ( It can be made by thin coating to form a coating layer 40, such as UV, urethane or silicone on the other surface of 10).

As shown in FIG. 5, as another embodiment of the graphite heat dissipation sheet 1 for the PDP, one surface of the graphite layer 10 has a thin coating layer 41 such as UV, urethane, or silicon. The adhesive liquid 20 is applied to the coating layer 41 in the coated state, and the release paper 30 is covered with the adhesive liquid 20 applied above, and the other side of the graphite layer 10. On the surface, a coating layer 40 such as UV, urethane or silicone is thinly coated, and the adhesive liquid 21 is coated on the coating layer 40 coated above, and the adhesive liquid 21 applied above. ) Is made of a release paper 31 is covered.

And, as shown in Figure 6, the corners (1a) and cut edges (1b) of the graphite heat dissipation sheet (1) for the PDP to be made by rounding or chamfering, which is a manufacturer and producer This is done to minimize the problem that the breakdown or breakage often occurs during use and handling of the whole product, which may lower the utility value as a product.

In addition, by treating the cut surface of the graphite heat dissipation sheet 1 for PDP with rounding or chamfering to prevent the above-mentioned breakage or damage phenomenon.

As shown in FIGS. 7 and 8, the area of the release paper 30 is larger than the size of the graphite layer 10 and the adhesive liquid 20.

This is to prevent the phenomenon that the graphite layer 10 is damaged in the process of peeling work is not easy at the same time when the manufacturer and producer to manufacture and produce the PDP grabbing the release paper 30 and peeling it. This is to avoid stripping by hand, or to facilitate stripping by automation.

As shown in FIG. 9, the area of the adhesive liquid 20 applied to one surface of the graphite layer 10 is formed to be smaller than the area of the graphite layer 10, which is the release paper ( This is to prevent the surface peeling phenomenon of the graphite layer 10 such as the adhesive liquid 20 by combining the cutting surface burr and the adhesive liquid generated during the stripping operation of 30) or cutting the graphite sheet.

In particular, the occurrence of burrs on the edge surface portions that are most buried and damaged, such as the adhesive liquid 20, is minimized in the entire portion of the graphite layer 10.

As shown in FIG. 10, the paint layers 40 and 41 are formed on the surface of the graphite layer 10 in a state in which thermally conductive excellent powders 50 made of a material such as aluminum, copper, or graphite are mixed. It is to be applied, which is to improve the thermal conductivity of the overall graphite heat dissipation sheet 1 for the PDP by the rain powder 50 mixed in the paint layer (40, 41).

Accordingly, the results of testing the thermal conductivity of the thickness of the coating layer 40 (41) to be coated (coated) on the graphite heat radiation sheet 1 of the present invention are shown in Table 1 and Table 2 below. will be.

In particular, in order to impart thermal conductivity characteristics of the heat dissipation sheet, the coating layer to be coated (coated) should be satisfied simultaneously with the adhesion to the graphite layer and the adhesion to the adhesive liquid while minimizing the thickness of the coating layer. Coating layer is coated with UV and coated (coated).

Paint layer Thermal Conductivity (W / mK) Thermal conductivity measurement condition Thickness direction Face direction 1u 6.5 228 * Heat radiation sheet size W435 × L495 × T1.4 * Adhesive type and thickness acrylic, 20u fixed * Measurement of thermal conductivity The direction of the surface was measured within 50mm of diameter with a heat source applied to the center of the heat radiation sheet, and the thickness was measured within 50mm of diameter with the heat source applied to the center of the heat radiation sheet. 5 u 6.5 227 10u 6.4 227 30u 6.5 226 50 u 6.3 226 100 u 6.4 226 150 u 6.3 225 200 u 6.1 222 250 u 6.2 222 300 u 6.1 220 350 u 5.3 175 400 u 3.8 116

In addition, the results shown in Table 2 below were the coating treatment (coating) in the state in which the powder having excellent thermal conductivity was mixed with the coating layer to test the thermal conductivity characteristics with respect to the thickness of the coating layer.

Paint layer Thermal Conductivity (W / mK) Thermal conductivity measurement condition Thickness direction Face direction 1u 6.6 228 * Heat radiation sheet size W435 × L495 × T1.4 * Adhesive type and thickness acrylic, 20u fixed * Measurement of thermal conductivity The direction of the surface was measured within 50mm of diameter with a heat source applied to the center of the heat dissipation sheet. 5 u 6.7 228 10u 6.5 227 30u 6.6 227 50 u 6.5 226 100 u 6.6 227 150 u 6.5 226 200 u 6.3 225 250 u 6.4 225 300 u 6.3 224 350 u 6.3 223 400 u 6.2 222 500 u 6.1 221 600 u 6.0 219

Based on this, when coating (coating) the coating layer on the heat dissipation sheet of the present invention, the thermal conductivity varies slightly depending on the thickness, but it can be seen that it does not significantly affect the overall characteristics. When the coating (coating) by mixing the powder having excellent thermal conductivity to the layer can be seen that the thermal conductivity is further improved, regardless of the thickness.

As described above, the present invention has the effect of minimizing the problems that may occur in handling, such as broken or damaged when the manufacturer and producer to assemble to configure the heat dissipation mechanism and the surface of the graphite heat dissipation sheet by the foreign matter It is effective to prevent contamination and prevents graphite from getting on the body such as the hands of manufacturers and producers during the assembly process, and the surface that falls off like adhesive when peeling off the release paper while the adhesive is applied. It is possible to automate the stripping of release paper when attaching the heat-dissipating sheet to the PDP panel with the effect that the peeling phenomenon does not occur, thereby improving the overall efficiency and maximizing the satisfaction and reliability for the manufacturers and producers who manufacture and produce PDP using You can have multiple effects simultaneously.

1 is an exemplary configuration diagram schematically illustrating the present invention;

Figure 2 is a cross-sectional configuration of the embodiment for showing the present invention in detail,

3 is another embodiment cross-sectional configuration according to the present invention,

4 is another embodiment cross-sectional configuration according to the present invention,

5 is an exemplary view of a state in which a paint layer, an adhesive liquid and a release paper are formed on both surfaces of the graphite layer according to the present invention;

Figure 6 is an exemplary view for explaining the corners and edges of the heat radiation sheet carried out by the present invention,

7 is an exemplary view for explaining a release paper carried out by the present invention;

8 is a cross-sectional view illustrating in detail the release paper according to FIG. 7;

9 is an exemplary view showing a difference between the graphite layer area and the adhesive liquid area according to the present invention;

10 is an exemplary view for explaining a state in which a powder having excellent thermal conductivity is mixed with a coating layer carried out by the present invention.

<Description of the code | symbol about the principal part of drawing>

1: graphite heat dissipation sheet for PDP

10: graphite layer

20,21: adhesive liquid

30,31: Release paper

40,41: paint layer

50: excellent thermal conductivity powder

Claims (9)

In the PDP graphite heat dissipation sheet in which a pressure-sensitive adhesive is coated on one surface of the graphite layer made of graphite, and a release paper is covered on the surface of the pressure-sensitive adhesive liquid applied to the PDP. , Graphite heat dissipation sheet for PDP on the other surface of the graphite heat dissipation sheet for PDP, characterized in that the coating layer of UV, urethane or silicon is formed by thin film treatment so that graphite is not buried at the time of PDP assembly work . The method of claim 1, In order to use the PDP graphite heat dissipation sheet between the graphite layer and the coated adhesive liquid, UV, urethane, or silicone may be used so that the surface of the graphite layer may fall off like the adhesive liquid. Graphite heat dissipation sheet, characterized in that the coating layer formed by coating a thin film. The method according to claim 1 or 2, The coating layer, such as UV, urethane or silicone is formed between the graphite layer and the coated adhesive liquid, and a thin film treatment to be formed on the other surface of the graphite layer, the graphite heat dissipation sheet for PD. The method according to any one of claims 1 to 3, On both surfaces of the graphite layer formed on the graphite heat dissipation sheet for the PDP, paint layers such as UV, urethane, or silicon are respectively thinly coated, and the coating layer is formed by applying an adhesive solution. Graphite heat dissipation sheet, characterized in that the coated adhesive is covered with a release paper. The method according to any one of claims 1 to 4, Each corner of the PDP graphite heat dissipation sheet is a graphite heat dissipation sheet, characterized in that the treatment is made by rounding or chamfering to minimize the breakage, such as breakage that may occur during use and handling. The method according to any one of claims 1 to 4, Graphite heat dissipation sheet, characterized in that made by treating the cut surface of the graphite heat dissipation sheet for PDP rounding or chamfering. The method according to any one of claims 1 to 4, The area of the release paper is made by forming a larger than the area of the graphite layer and the adhesive liquid formed on the graphite heat dissipation sheet for PDP in order to facilitate the peeling operation of the release paper and facilitate automation for manufacturers and producers to manufacture and produce PDP Graphite heat dissipation sheet for PD. The method according to any one of claims 1 to 4, The area of the adhesive solution coated on one surface of the graphite layer is formed to be smaller than the area of the graphite layer in order to prevent damage to the edge surface area most damaged by the adhesive liquid when peeling off the release paper. Graphite heat dissipation sheet for PD. The method according to any one of claims 1 to 4, Graphite heat dissipation sheet, characterized in that the coating layer is made of a mixture of excellent thermal conductivity made of a material such as aluminum, copper or graphite to improve the thermal conductivity of the graphite heat dissipation sheet for PDP as a whole.