KR100761436B1 - Plasma Display Device - Google Patents

Abstract

The present invention relates to a plasma display device, wherein the plasma display device includes a panel, a frame formed on a rear surface of the panel, and at least two heat conductive sheets having different areas formed between the panel and the frame. The thermally conductive sheets are formed to be spaced apart from each other by a predetermined interval in parallel to each other, so that only a part of the thermally conductive sheets formed on the rear surface of the panel have adhesiveness, so that separation workability between the panel and the thermally conductive sheets is improved and heat generated from the panels is improved. This effectively has the effect of being released into the frame. In addition, the thickness of the non-adhesive thermal conductive sheet in the area corresponding to the center of the panel is formed thicker than the adhesive thermal conductive sheet is configured to facilitate the separation operation has the effect of improving the workability. In addition, by forming the thermally conductive sheets spaced apart by a predetermined interval, the panel and the thermally conductive sheet are not continuously adhered to each other to improve workability, and the thermally conductive sheet is not formed at the spaced portions, thereby reducing manufacturing costs.

Plasma Display, Adhesive, Thermally Conductive Sheet, Frame

Description

Plasma Display Device

1 is a view showing the structure of a conventional plasma display device;

2 is a perspective view showing the structure of a plasma display device according to the present invention;

3 is a cross-sectional view showing the structure of two types of thermally conductive sheets of the plasma display device according to the present invention;

4 is a plan view showing a thermally conductive sheet of the plasma display device according to the present invention;

5A and 5B are cross-sectional views showing the structure of a plasma display device according to the present invention;

6A is a diagram illustrating a temperature change of the plasma display apparatus at the full white output;

6B is a graph showing a temperature change of the plasma display apparatus at the full white output;

FIG. 7A illustrates a change in temperature of the plasma display apparatus when a hot spot is output.

7B is a graph illustrating a change in temperature of the plasma display apparatus when a hot spot is output.

<Explanation of symbols on main parts of the drawings>

100: panel 110: upper substrate

120: lower substrate 200: frame

300: thermal conductive sheet 310: first sheet

320: second sheet 330: third sheet

h1: A type thermal conductive sheet thickness h2: B type thermal conductive sheet thickness

g: gap between thermally conductive sheets

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a plasma display device having a thermally conductive sheet between a panel and a frame so that heat of the panel is well discharged to the frame, and at the same time, workability of separating the panel and the thermally conductive sheet is improved. will be.

The structure of the plasma display device according to the related art is as follows.

1 is a diagram showing the structure of a conventional plasma display device. Referring to FIG. 1, a conventional plasma display apparatus includes a panel 10, a frame 20 to which the panel is fixed, and a thermally conductive sheet 30 formed between the panel and the frame.

 The panel 10 includes an upper substrate 11 and a lower substrate 12 facing the upper substrate. The panel 10 generates a lot of heat due to discharge, and the temperature becomes very high during operation.

The frame 20 is positioned at the rear of the panel 10 to fix the panel 10 and serves to release heat generated from the panel.

A cohesive thermally conductive sheet 30 is formed between the panel and the frame to allow heat generated in the panel 10 to be transferred to the frame better and to secure the panel to the frame.

The thermally conductive sheet 30 is made of a single thermally conductive sheet, the entire surface has an adhesive force. Once the back of the panel is adhered to the thermally conductive sheet 30, when the panel is separated from the thermally conductive sheet afterwards, when the panel and the frame are separated since the large area of the panel is bonded to the thermally conductive sheet. There is a problem that the separation workability is time-consuming and high cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and an object thereof is to provide a plasma display device having improved workability and heat dissipation by facilitating separation of a thermally conductive sheet that is a heat conduction medium between a panel and a frame. .

Plasma display device according to the present invention for solving the above problems comprises a panel, a frame formed on the back of the panel, and at least two or more thermally conductive sheets having different areas formed between the panel and the frame. The thermally conductive sheets are formed to be spaced apart from each other by a predetermined interval.

Here, the heat conductive sheet includes a first sheet having a first area, a second sheet having a second area smaller than the first area, and a third sheet having a third area smaller than the first area.

Also, the second area and the third area are substantially the same.

The panel and the frame are adhered to each other by the second sheet and the third sheet.

The spacing between the thermally conductive sheets is about 5 mm or less.

The first sheet is thicker than the second sheet or the third sheet.

The first sheet is in the form of a foam comprising at least one of urethane, silicone and acrylic components.

The second sheet and the third sheet includes a base layer in the form of a form including at least one or more of urethane, silicone and acrylic components, and an adhesive layer including acrylic components formed on both surfaces of the base layer, respectively. It is composed.

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

2 is a perspective view showing the structure of a plasma display device according to the present invention. Referring to FIG. 2, the plasma display apparatus according to the present invention includes at least two thermoelectric panels having a panel 100, a frame 200 formed on a rear surface of the panel, and an area formed between the panel and the frame. The conductive sheet 300 is configured to be included.

The panel 100 includes an upper substrate 110 and a lower substrate 120 facing the upper substrate.

Scan electrodes and sustain electrodes are formed on the upper substrate 110, and address electrodes are formed on the lower substrate 120. In addition, a partition wall is formed on the lower substrate 120 to partition the discharge cells.

A thermally conductive sheet is formed on the front surface of the frame 200 so that heat generated from the panel 100 is transferred to the frame through the thermally conductive sheet. The transferred heat is dissipated through the rear of the frame, and a driving circuit board for driving the panel is attached to the rear of the frame.

The thermally conductive sheet 300 is composed of three thermally conductive sheets, the first sheet 310 of the first area, the second sheet 320 of the second area smaller than the first area, and the smaller of the first area. It consists of the 3rd sheet 330 of a 3rd area.

Here, the area of the second sheet and the third sheet is substantially the same.

The thermally conductive sheet 300 is formed of a material having high thermal conductivity, and in particular, the thermal conductivity is preferably about 0.35 W / mK or more. If the thermal conductivity is less than about 0.35 W / mK, heat generated from the panel is not properly transferred to the frame, which reduces the heat dissipation effect.

The thermally conductive sheet 300 is formed of a material that is not too hard to have a function of alleviating impact in addition to the thermal conduction function. Thus, the thermally conductive sheet 300 is characterized by having a hardness of about 12 to 35 as a Asker-C measurement.

The thermally conductive sheet 300 is largely composed of two types, and FIG. 3 is a cross-sectional view showing the structure of two types of thermally conductive sheets of the plasma display device according to the present invention. Referring to FIG. 3, in the present invention, the thermal conductive sheet 300 is largely composed of two types, A type and B type.

The thermally conductive sheet A of type A is composed of three layers. Adhesive layers a2 and a3 are formed on both surfaces of the center base layer a1.

The base layer a1 has a foam form including at least one of urethane, silicone and acrylic components. Preferably, the urethane foam is formed by compounding silicone or acrylic foam. The foam-based base layer functions to alleviate and reduce the impact applied to the panel or the noise generated from the panel.

The adhesion layer (a2.a3) is formed including an acryl component. The adhesive layers a2 and a3 have a predetermined adhesiveness. The adhesive layer has a degree of adhesion that can be fixed to the glass or metal forming the panel or frame without a separate adhesive.

The thermally conductive sheet (B) of type B has a foam form including at least one or more of urethane, silicone and acrylic components. Preferably, the urethane foam is formed by compounding silicone or acrylic foam. The foam-based base layer functions to alleviate and reduce the impact applied to the panel or the noise generated from the panel.

The thermally conductive sheet of type B has a property of not having adhesiveness, and the thickness h2 of the thermally conductive sheet of type B is preferably formed thicker than that of the thermally conductive sheet h1 of type A.

In addition, the A type has a higher hardness than the B type. In this case, the thermally conductive sheet of type B may have the same thickness because of its low hardness even if the thickness is thicker than the A type.

4 is a plan view showing a thermally conductive sheet of the plasma display device according to the present invention. Referring to FIG. 4, the thermally conductive sheet of the present invention is a second sheet 320 positioned at the top of the panel to bond the panel to the frame, and a third sheet positioned at the bottom of the panel to bond the panel to the frame. 330 and a first sheet 310 positioned between the second sheet 320 and the third sheet 330.

The second sheet 320 and the third sheet 330 are A-type thermal conductive sheets and have adhesiveness. In the meantime, the first sheet 310 is formed, and the first sheet 310 does not have adhesiveness as a B-type thermal conductive sheet. Thus, the first sheet is fixed to the frame using an adhesive on one surface.

The first sheet 310, the second sheet 330, and the third sheet 330 are spaced apart by a predetermined interval (g), but are preferably spaced apart by about 5 mm or less. By separating the gaps between the thermally conductive sheets such that the air layer is formed on the spaced portions so that the panel and the thermally conductive sheets are not continuously adhered to each other, the separation operation becomes easier and the workability is further improved.

If the separation interval is larger than 5mm, there is a problem that the thermal conductivity sheet is not formed in the spaced interval (g), so that it is difficult to discharge the heat of the panel to the frame, thereby partially causing the temperature of the panel to be uneven. The efficiency of becomes low.

5A and 5B are sectional views showing the structure of the plasma display device according to the present invention. Specifically, FIGS. 5A and 5B are views illustrating a state in which the panel is adhered to the thermally conductive sheet. 5A and 5B, a second sheet 320 and a third sheet 330 of an A type are formed on the upper side and the lower side of the frame 200, respectively, and the second sheet and the third sheet. The first sheet 330 is positioned at the center part spaced apart by a predetermined interval g.

The second sheet and the third sheet are formed to a thickness of h1, and the first sheet is formed to a thickness of h2. Here, the thickness h1 of the second sheet and the third sheet is smaller than the thickness h2 of the first sheet.

The thickness h1 or h2 of the first to third sheets is preferably between about 0.85 mm and 1.1 mm.

One surface of the first to third sheets is attached to and fixed to the frame.

Since the 2nd sheet and the 3rd sheet contain the adhesive acryl layer, hardness is high compared with a 1st sheet. The hardness of the first sheet is lower than that of the second and third sheets because it is a non-tacky, foam-shaped layer without an acrylic layer.

Therefore, when the panel 100 is adhered to the thermally conductive sheet as shown in FIG. 5B, the second sheet 320 and the third sheet 330 are firmly adhered to and fixed to the upper and lower ends of the panel, respectively. The first sheet 310 is pressed by the central portion of the panel and pressed to the same height h1 as the second and third sheets.

Since the thickness of the thermally conductive sheet formed at the center of the panel is thick as described above, the force of the thermally conductive sheet pushing the panel becomes larger when the panel and the thermally conductive sheet are separated. That is, if only the upper and lower adhesive thermally conductive sheets are separated, the thermally conductive sheet in the center portion of the panel has no adhesiveness and is thick, so that the panel and the thermally conductive sheet can be separated more easily.

The thermally conductive sheet of type A in the thermally conductive sheet is formed to have an area of about 0.5% to 20% of the total panel area. That is, it is preferable that the area of the adhesive thermal conductive sheet is formed to have an area of about 0.5% to 20% of the total panel area. In consideration of this area, the widths of the second sheet 320 and the third sheet 330 should be properly adjusted.

Since the area of the thermally conductive sheet having adhesiveness to the total area of the panel is less than about 20%, workability is improved when the panel and the thermally conductive sheet are separated. That is, since only the upper side and the lower side of the adhesive panel need to be separated, the separation operation becomes easy.

When the area of the thermally conductive sheet having the adhesiveness is smaller than the reference value, the adhesive force is lowered, so that it is difficult to be fixed to the thermally conductive sheet due to the weight of the panel.

FIG. 6A is a diagram illustrating a temperature change of the plasma display apparatus at the full white output, and FIG. 6B is a graph illustrating a temperature change of the plasma display apparatus at the full white output.

FIG. 6A is a color diagram illustrating a color difference of a temperature of a full white image outputted to a panel when a gap between the thermally conductive sheets is formed of about 0 mm, 5 mm, and 10 mm. The closer it is to the violet phase, the higher the temperature. The closer to the blue phase, the lower the temperature. (A) of FIG. 6A is a diagram showing a temperature change when the intervals of the thermally conductive sheets are separated by about 0 mm, and (b) is a temperature change when the intervals of the thermally conductive sheets are separated by about 5 mm. (C) is a figure which shows the temperature change when the space | interval of thermally conductive sheets is spaced apart by 10 mm.

FIG. 6B is a graph illustrating the change in temperature of FIG. 6A. As the spaced intervals are higher, the spaced portions have a purple color, and thus the panel temperature of the corresponding portions is high. That is, since the thermally conductive sheet is not formed in the spaced parts, the heat of the panel is not easily released to the frame, and thus the panel temperature is high. If the temperature of the panel is high, the phosphor and discharge of the panel are affected, resulting in deterioration of the image quality of the plasma display device, such as an error discharge.

However, the larger the spaced interval, the better the workability of the panel, and the manufacturing cost is reduced, and considering this, it is preferable to form a thermally conductive sheet with a spaced interval of about 5 mm or less.

For a more accurate experiment, we will compare the temperature of the panel by generating a lot of discharge in the spaced parts of the discharge sheet.

FIG. 7A is a diagram illustrating a temperature change of the plasma display apparatus when the hot spot is output, and FIG. 7B is a diagram illustrating a temperature change of the plasma display apparatus when the hot spot is output. That is, a specific portion is output in white, but FIGS. 7A and 7B show that a hot spot is generated by generating a large amount of discharge in a portion of the panel where the thermally conductive sheet is spaced apart, that is, a portion of the panel where the thermally conductive sheet is not formed. After measuring the temperature of the panel.

(A) of FIG. 7A is a diagram showing the temperature change when the intervals of the thermally conductive sheets are separated by about 0 mm, and (b) is the temperature when the intervals of the thermally conductive sheets are separated by about 5 mm. (C) is a figure which shows the temperature change when the space | interval of a thermally conductive sheet is spaced apart by 10 mm.

Similarly, FIG. 7B is a graph illustrating the temperature change of FIG. 7A. As the spaced intervals are higher, the spaced portions have a purple color, and thus the panel temperature of the corresponding portions is high. That is, since the thermally conductive sheet is not formed in the spaced parts, the heat of the panel is not easily released to the frame, and thus the panel temperature is high.

In addition, when outputting a hot spot, it can be seen that the panel temperature is higher at a part separated from the full white screen. If the temperature of the panel is high, the phosphor and discharge of the panel are affected, resulting in deterioration of the image quality of the plasma display device such as an error discharge.

Similarly, the larger the spaced interval is, the better the separation workability of the panel and the thermally conductive sheet, and the manufacturing cost is reduced, and considering this, it is preferable that the thermally conductive sheet is formed with a spaced interval of about 5 mm or less.

As described above, the plasma display device according to the present invention has been described with reference to the illustrated drawings. However, the present invention is not limited by the embodiments and drawings disclosed herein, and may be applied within a range in which technical thoughts are protected.

Plasma display device according to the present invention is configured as described above because only a part of the thermally conductive sheet formed on the back of the panel has an adhesive property separation workability between the panel and the thermally conductive sheet is improved and heat generated from the panel is effectively released to the frame It works. In addition, the thickness of the non-adhesive thermal conductive sheet in the area corresponding to the center of the panel is formed thicker than the adhesive thermal conductive sheet is configured to facilitate the separation operation has the effect of improving the workability. In addition, by forming the thermally conductive sheets spaced apart by a predetermined interval, the panel and the thermally conductive sheet are not continuously adhered to each other to improve workability, and the thermally conductive sheet is not formed at the spaced portions, thereby reducing manufacturing costs.

Claims (10)

A panel; A frame formed at the rear of the panel; At least two thermally conductive sheets having different areas formed between the panel and the frame; The thermally conductive sheet comprises: a first sheet having a first area formed parallel to each other at a predetermined interval; A second sheet of a second area less than the first area; A third sheet of a third area less than the first area, The second sheet and the third sheet, A base layer in the form of a form including at least one of urethane, silicone and acrylic components; And an adhesive layer including acrylic components formed on both surfaces of the base layer, respectively. delete The method according to claim 1, And the second area and the third area are substantially the same. The method according to claim 1, And the sum of the second area and the third area is about 0.5% to 20% of the total panel area. The method according to claim 1, And the panel and the frame are adhered to each other by the second sheet and the third sheet. The method according to claim 5, The second sheet is positioned at an upper end of the panel, the third sheet is positioned at a lower end of the panel, and the first sheet is positioned between the second sheet and the third sheet. . The method according to claim 6, And a spacing distance between the thermally conductive sheets is about 5 mm or less. The method according to claim 1, And the first sheet is thicker than the second sheet or the third sheet. The method according to claim 1, The first sheet is a plasma display device, characterized in that the foam form containing at least one or more of the urethane, silicone and acrylic components. delete

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