KR100770080B1 - Plasma Display Device - Google Patents

Abstract

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 heat sink in which a heat radiation efficiency is not lowered even when a pivot function is applied.

In the plasma display apparatus according to the present invention, a plasma display apparatus including a plasma display panel and a circuit unit for supplying a driving signal to the panel, wherein the plasma display apparatus is divided into two or more stages having different wing directions to dissipate heat generated from the circuit unit. It is provided with a multi-stage heat sink having a wing portion.

Heatsink, IPM, TCP

Description

Plasma Display Device

Figure 1a is a view showing the installation form of the conventional heat sink and the flow of air.

Figure 1b is a simplified view showing the flow of the heat sink and air when the PDP is rotated 90 degrees.

2 shows a plasma display device according to the present invention;

3 is a view showing in more detail the structure of the multi-stage heat sink provided in the plasma display device of the present invention.

Figure 4 is a simplified view showing the wing direction of the multi-stage heat sink.

Figure 5a is a view showing an example formed by varying only the height of the wing.

Figure 5b is a view showing an example formed by varying the number of wings formed in the same area. Figure 5c is a view showing an example formed by changing only the thickness of the wing.

<Explanation of symbols for main parts of the drawings>

1: PDP 2: heat sink

3: case 4: panel

6: heat conductive sheet 8: adhesive member

10 frame 12 printed circuit board

14: protective plate 16: multi-stage heat sink

17 connection member 20 base portion

21: first wing portion 22: second wing portion

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 heat sink in which a heat radiation efficiency is not lowered even when a pivot function is applied.

Recently, many flat display devices have been developed to replace cathode ray tubes (CRTs). Representative examples of such flat panel displays include liquid crystal displays (LCDs), electroluminescence displays (ELDs), field emission displays (FEDs), and plasma displays. A panel (or plasma display device, hereinafter referred to as " PDP ").

In particular, the PDP displays an image by the visible light generated by the discharge generated in the panel. To this end, a plurality of electrodes are formed on the panel of the PDP, and are formed on a printed circuit board installed in the rear direction of the driving circuit PDP for supplying driving signals to the electrodes.

The printed circuit board includes a data driver, a scan driver, a sustain driver, a power supply, and a control circuit, and the drivers are formed of a plurality of substrates separated by function and location.

Typically, the above-described driving units are formed on the printed circuit boards. Here, the scan driver and the sustain driver may be formed on one substrate and provided in the form of an integrated substrate. That is, the driver substrates having the data driver, the scan driver, and the sustain driver are respectively formed, the substrates having the power supply for supplying power for generating the drive signal, the respective driver and the power supply are controlled, and the data from the outside is controlled. It consists of the substrates in which the control part for processing was formed.

Among the substrates on which the driving units are formed, a power supply unit and a separate power supply module are mounted. In general, this power supply module (hereinafter referred to as "IPM") serves to convert power supplied by being converted into direct current (DC) from a power supply into signal power under the control of a driving unit. That is, the IPMs convert the DC power into voltages having different potentials of various stages, or invert polarities to generate signal power required for driving the PDP.

Due to the nature of the PDP, these IPMs generate a lot of heat during operation. This is because the potential of the driving waveform for driving the PDP is very high compared with other display elements, and the frequency of applying the waveform is very frequent. More specifically, in the case of a PDP driven by dividing one subfield into an aggress period, a reset period, and a sustain period, reset discharge, address discharge, and sustain discharge are generated in each period. In particular, in the case of the sustain discharge, up to 128 times can be generated in one subfield period, and the magnitude of the signal voltage for generating one discharge is also small from several tens of volts [V] to about 100 to 200 [V]. Very high signal voltages are used. In the case of the address discharge, a discharge is generated by applying an address signal having a different polarity to the two electrodes, and the difference in the signal voltage applied to the two electrodes also reaches several hundred volts [V]. Since the high voltage signal is applied dozens of times per second, the IPM generating these driving signals is also designed to withstand such a load.

In particular, when the heating elements such as the IPM do not effectively cool the heat generated from them, deterioration or damage or distortion of the signal may occur, thereby causing abnormal operation of the PDP. In order to effectively generate heat, cooling means such as a heat sink (or a heat sink) is attached to one side of the IPM element.

1 is a view for explaining the problem of the conventional heat sink, Figure 1a is a view showing the installation form and the air flow of the conventional heat sink, Figure 1b is a simplified view of the heat sink and air flow when the PDP is rotated 90 degrees It is shown in the figure.

Referring to FIG. 1, the conventional PDP 1 is provided in a shape in which the horizontal direction, that is, the horizontal length is longer than the vertical length. Here, the PDP 1 of FIG. 1A is shown very briefly to show the installation form, and its internal components are not shown. When the PDP 1 is installed as shown in FIG. 1A, the heat sink 2 installed on the heat generating portion such as the IPM is installed so that the direction of the blades 2a faces the vertical direction. This is to increase the cooling efficiency by using the convection phenomenon of the air as shown in Figure 1a, the air flows between the blades (2a) of the heat sink 2 installed in the vertical direction, thereby cooling the heat sink (2). That is, in a manner in which circulation due to the density difference of air is taken into account, as shown in FIG.

When the installation direction of the heat sink 2a wing 2a becomes perpendicular | vertical to the flow direction of air like FIG. 1B, since the contact ratio with air becomes very low except the wing 2a located in the outermost part, efficient heat dissipation becomes difficult.

However, recently released PDP has been released a lot of products that can take both the form of Figure 1a and 1b. In more detail, the use of PDPs that can be installed in the vertical direction for exhibition and industrial use is increasing. In line with this, companies are also able to rotate the conventional long form of the product 90 degrees in some cases by using a long vertical direction. These PDP products use the term pivot to advertise display in both horizontal and vertical directions.

However, the products to which the pivot function is applied have the same problem as described with reference to FIG. 1. That is, since the heat sinks installed on the printed circuit board are fixed to the heating part as in the prior art, and the wing direction is fixed in one direction, when the PDP is rotated using the pivot function, the wing direction of the fixed heat sink is Perpendicular to the convection direction. That is, in the conventional PDP, when the pivot function is used, the cooling efficiency is very low in any one of the vertical and horizontal displays, and thus there is a problem in that malfunction and damage of the device frequently occur.

Accordingly, an object of the present invention is to provide a plasma display device having a heat sink which does not lower the heat radiation efficiency even when the pivot function is applied.

In order to achieve the above object, the plasma display apparatus according to the present invention includes a plasma display panel and a circuit portion for supplying a driving signal to the panel. It is provided with a multi-stage heat sink having wings divided into two or more stages formed differently.

The driving unit may include a power supply unit supplying signal power for generating a driving signal, a connection member connecting the circuit unit and the panel, and a driving chip mounted on the driving unit for relaying the driving signal. In this case, the multi-stage heat sink may contact at least one of the power supply unit and the connection member. In addition, the multi-stage heat sink may contact the driving chip.

On the other hand, the multi-stage heat sink is formed on the bottom portion, the first wing portion extending from the bottom portion and the wing direction toward the first direction, and formed on the first wing portion, so that the wing direction is directed to the second direction It may have a second wing formed. At this time, the angle between the first direction and the second direction may be 90 degrees.

In addition, at least one of the height, thickness, material, and the number of wings formed on the same area of the first wing portion and the second wing portion may be formed differently.

In addition, the power supply unit may include at least one of an AC-DC converter and a power supply module (IPM), and the connection member may be a tape carrier package.

Other features and effects of the present invention other than the above object will be revealed through a detailed description of the embodiments with reference to the accompanying drawings. Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 to 5.

2 is a view showing a plasma display device according to the present invention.

Referring to FIG. 2, the plasma display device according to the present invention includes a case 3, a panel 4, a thermal conductive sheet 6, an adhesive member 8, a frame 10, a printed circuit board 12, and a multi-stage heat sink. (16) is provided.

The case 3 is divided into a front case 3a and a rear case 3b, and the front case 3a is fastened to the rear case 3b so that the panel 4, the heat conductive sheet 6, and the adhesive member 8 ), The frame 10 and the printed circuit board 12 is accommodated therein, and protects the internal objects from external shocks and contaminants. In addition, the front case 3 is formed with a light transmitting portion 18 to emit visible light generated from the panel 4, and prevents the noise generated when the PDP is driven to the user. A filter assembly may be inserted between the light transmitting portion 18 of the front case 3a and the front substrate 4a of the panel 4. The filter assembly includes a correction filter that absorbs some visible light to correct color, an electromagnetic wave blocking filter that blocks electromagnetic waves generated from the inside, and an anti-reflection film that prevents degradation of image quality due to external light. The rear case 3b protects the interior of the container, such as the front case 3a, and a plurality of ventilation holes for heat dissipation are formed in the rear case 3b.

The panel 4 displays an image by the discharge generated by the drive signal provided from the drive section formed on the printed circuit board 12. To this end, the panel 4 forms a partition, an electrode, a phosphor, a dielectric, and a protective film between two or more substrates 4a and 4b to form a space in which discharge occurs, that is, a discharge cell. The discharge cell is also filled with an inert gas that emits ultraviolet rays in the wavelength band for exciting the phosphor during discharge. The panel 4 is connected to the driving unit of the printed circuit board 12 by a connection member such as FPC and TCP in a chip-on-film type in which some driving chips are mounted. In addition, an accessory member such as an adhesive member 8 and a thermally conductive sheet 6 may be attached to the rear surface of the panel 4.

The thermally conductive sheet 6 is inserted between the panel 4 and the frame 10 to transfer heat generated from the panel 4 to the frame 10 when the PDP is driven or to radiate heat, thereby rapidly increasing the temperature of the panel 4. Prevent ascension. In addition, the thermally conductive sheet 6 evens the temperature distribution of the non-uniform panel 4, thereby preventing the panel 4 from being broken or malfunctioning due to local temperature differences. It is preferable that the heat conducting sheet 6 is different from the attaching method and role of the frame 10 according to the material for the normal operation of the PDP. For example, when the material of the frame 10 is a material having good thermal conductivity and heat dissipation, such as a metal frame, the thermal conductive sheet 6 is in close contact with the frame 10. In this case, a considerable amount of heat generated by the panel 4 is transferred to the frame 10 by the heat conductive sheet 6 to radiate heat, and part of the heat is radiated by the heat conductive sheet 6. On the other hand, when the material of the frame 10 is not good thermal conductivity and heat dissipation characteristics, such as a plastic frame, the thermal conductive sheet 6 and the frame 10 is provided to have a predetermined interval. At this time, most of the heat generated in the panel 4 is radiated by the heat conductive sheet 6, so that the temperature of the panel 4 can be kept constant.

The adhesive member 8 fixes the thermal conductive sheet 6 or panel 4 to the frame 10. To this end, the adhesive member 8 is formed in the form of a strip or frame in the edge portion of the thermal conductive sheet 6, as shown in Figure 1, to fix the thermal conductive sheet 6 or panel 4 to the frame 10 do. As such an adhesive member 8, it is possible to use an adhesive, an adhesive sheet and an adhesive tape. The adhesive member 8 may vary the thickness and shape of the attachment method and the adhesive member 8 according to the characteristics of the frame 10. As described above, in the case of using a frame made of a material having poor thermal conductivity and heat dissipation characteristics, it is preferable to provide a space between the adhesive members 8. The reason why the adhesive members 8 are spaced apart at predetermined intervals is to facilitate heat dissipation of the heat conductive sheet 6 by allowing air to flow through the space between the adhesive members 8. In addition, even when the adhesive member 8 directly attaches the panel 4 to the frame, it is preferable that the thickness of the adhesive member 8 is thickened to form a gap in which air can be distributed to dissipate the heat conductive sheet 6. Do. On the other hand, when using a frame made of a material having good thermal conductivity and heat dissipation characteristics, it is necessary to determine the shape and shape of the adhesive member 8 so that the thermal conductive sheet 4 and the frame are in close contact with each other.

The frame 10 fixes the panel 4 or the thermal conductive sheet 6 by the adhesive member 8. In addition, depending on the material of the frame 10, it is also possible to dissipate heat of the panel 4, the printed circuit board 12, and the TCP. The frame 10 supports and fixes the printed circuit board 12 by fastening means such as a boss or a screw. As described above, the frame 10 determines whether the frame 10 is in close contact with the thermal conductive sheet 6. In addition, when using the metal frame 10, it may be used as a ground power source of some of the driving circuit formed on the printed circuit board 12. In addition, a fixing ear portion for fixing the front case 2 or the rear case 14 may be formed at the edge or the corner of the frame 10.

The printed circuit board 12 has a circuit portion for driving the PDP. This circuit part includes a power supply for power supply, an address driver for supplying drive signals to the electrodes of the panel 4, a scan driver and a sustain driver, a power supply and each driver, and control for processing data from the outside. A circuit portion is formed. The printed circuit board 12 is divided into several pieces of substrates on which each of these circuit portions is formed. In particular, an AC-DC converter is mounted in a power supply unit of the printed circuit board 12, and a power supply module (IPM) for generating a driving signal is mounted in each driving unit. In addition, a driving buffer board is provided between each driving unit of the printed circuit board 12 and the panel 4, and the driving signal from the driving unit is supplied to the panel 4 via this driving buffer board. Here, the scan driver and the sustain driver may be formed on the same substrate 12d, and in this case, one buffer board may be shared. In addition, the panel 4 and the printed circuit board 12 may be connected to each other such as a TCP (Tape Carrier Package: 17c), a flexible printed circuit (17b), and a flexible flat cable (17a). A member 17 is provided to transmit signals and power. In addition, a multi-stage heat sink 16 is attached to the AC-DC converter and the IPM to radiate heat generated by the converter and the IPM.

The connecting members 17 electrically connect the printed circuit boards 12 and transmit a driving signal from the driving unit to the panel 4. As the connecting member 17, a flexible cable such as TCP 17c, FPC 17b, and FFC 17a is mainly used. In particular, a driving chip is mounted to supply driving signals to the address electrodes of the panel 4. TCP in the form of a chip on film is used. In addition, this TCP 17C is protected from external shock by the protection plate 14 shown in FIG.

The protection plate 14 is fixed to the frame 10 to protect the TCP 17c from external shocks and to fix the multi-stage heat sink 16 for dissipating heat generated from the TCP 17c. A heat conducting medium layer and a thermal grease layer are formed between the protective plate 14 and the TCP 17c to efficiently receive heat generated from the driving chip on the TCP 17c.

The multi-stage heat sink 16 dissipates heat generated from heat generating elements such as an AC-DC converter, IPM, and TCP 17c, thereby preventing a temperature rise of the heat generating elements, and guarantees normal operation. To this end, the multi-stage heat sink 16 is attached to the outer case of the AC-DC converter, the surface of the IPM and the protective plate 14. In addition, the multi-stage heat sink 16 is formed with at least two stages of wings having different wing formation directions to maintain heat dissipation efficiency even when the installation direction of the PDP is changed by the pivot function.

3 is a view showing in detail the structure of a multi-stage heat sink provided in the plasma display device of the present invention, Figure 4 is a view showing a brief view of the wing direction of the multi-stage heat sink.

3 and 4, the multi-stage heat sink provided in the PDP of the present invention includes a bottom portion 20, a first wing portion 21, and a second wing portion 22.

The bottom portion 20 receives heat from the IPM, the AC-DC converter, and the TCP 17c, transfers the heat to the first and second wings 21 and 22, and radiates some heat. To this end, one side of the bottom portion 20 is in contact with the heat generating element, and the first wing 21 is extended on the other side.

The first wing portion 21 radiates heat transmitted from the bottom portion 20 and transfers the heat to the second wing portion. To this end, the first wing portion 21 extends from one side of the front portion 20 and includes a plurality of wings spaced apart at predetermined intervals. In addition, a second wing portion 22 is formed above the first wing portion 21.

The second wing 22 radiates heat transmitted through the first wing 21. To this end, one side of the second wing 22 is in contact with the first wing 21.

Here, the first wing portion 21 and the second wing portion 22 is formed so that the wing direction is twisted at a predetermined angle. That is, in order to use in a PDP with a pivot function, the angle between the wings of the first wing 21 and the second wing 22 is formed to be close to 90 degrees. Here, the wing direction of the wings (21, 22) refers to the direction of air flow between the wings as shown in Figure 3 or the direction when the line is drawn from the upper edge of the upper edge to the other edge of the wing.

In addition, although not shown in FIG. 3, a second bottom surface portion may be formed between the first wing portion 21 and the second wing portion 22. When the second bottom portion is formed, the flow of air may be partially prevented, but since the heat dissipation area can be increased and the second wing portion 22 can be more firmly supported, the second bottom portion is formed in consideration of the heat dissipation efficiency. It is desirable to consider.

 In FIG. 4, the vane directions of the first and second vanes 21 and 22 and the installation forms of the PDP are briefly shown, and the X direction means the vertical direction and the Y direction means the horizontal direction. The PDP used by general users is installed as shown in FIG. At this time, the wing direction of any one of the 1st and 2nd wing parts 21 and 22, for example, the 1st wing part 21 is installed so that it may face A direction. Then, the wing direction of the second wing portion 22 at this time is formed in the B direction twisted about 90 degrees with the first wing portion 21. In this case, the angle between the wing direction A of the first wing 21 and the wing direction B of the second wing 22 is preferably determined in consideration of the rotation angle of the PDP when the pivot function is performed.

When the multi-stage heat sink having the wing portions 21 and 22 divided into two directions A and B is installed as shown in FIG. 4, the first wing portion 21 is used by the first wing portion 21 in normal use as shown in (a). The heating elements are cooled. That is, the air flow direction coincides with the wing direction A of the first wing portion 21, but does not coincide with the wing direction B of the second wing portion 22, so that the second wing portion 22 Cooling effect is reduced significantly. On the other hand, since the wing direction A of the first wing portion 21 coincides with the air flow direction (or convection direction), the cooling efficiency of the first wing portion 21 can be maintained, and as a result, The heating element can be cooled continuously.

Similarly, when the PDP is rotated in the vertical direction X as shown in Fig. 4B, the cooling efficiency of the first blade 21 is lowered by the rotation, and the air flow direction is consistent with the blade direction B '. Cooling of the heating element is made by the second blade 22.

Figure 5 is a simplified view to form the wings differently, Figure 5a shows only the case of different height, Figure 5b shows the case of varying the number of wings formed in the same area, Figure 5c shows the thickness of the wings It is a figure which shows the case.

The first and second wing parts 21 and 22 may be formed to have the same size, thickness, material, and number for convenience of manufacture. However, in the multi-stage heat sink 16, the bottom portion 20 and the first wing portion 21 maintain a higher temperature than the second wing portion 22, and a relatively large amount of heat is transferred. Therefore, in order to improve heat dissipation efficiency, it is preferable to form the 1st wing part 21 and the 2nd wing part 22 in a different form or material.

This example is shown in FIGS. 5A-5C. As shown in FIG. 5A, the height of the wing of the first wing 21 to which much heat is supplied may be higher than the height of the second wing 22 to increase air flow and heat dissipation area, thereby increasing heat dissipation efficiency. In addition, it is possible to increase the number of wings formed in the same area as shown in Figure 5b, or to vary only the thickness as shown in Figure 5c. In addition, different heat dissipation efficiency of the first wing part 21 and the second wing part 22 by different materials of the first wing part 21 and the second wing part 22 is also a good way to increase the heat dissipation efficiency. Becomes

In addition, as described with reference to FIGS. 2 to 5, the third wing or the fourth wing may be provided in addition to the first and second wing parts 21 and 22 to be configured in multiple stages. However, in this case, if the height of the wing is lowered, since contact with air becomes difficult, and the heat dissipation efficiency may be lowered, it is preferable to determine the optimum number of stages by experiment.

As described above, the plasma display device of the present invention includes a heat sink having multiple wing portions having different wing directions. Through this, the plasma display device of the present invention can be such that the heat dissipation efficiency does not decrease even when the plasma display device is rotated and used as in the pivoting function. As a result, when the plasma display device is rotated and used, it is possible to prevent problems with overheating, breakage, and malfunction of the heat generating element caused by the lowered heat dissipation efficiency.

Claims (9)

A plasma display device comprising a plasma display panel and a circuit unit for supplying a driving signal to the panel. It is provided with a multi-stage heat sink having a wing portion divided into two or more stages formed in the wing direction is different to radiate heat generated from the circuit portion, And at least one of the heights, thicknesses, materials, and the number of wings formed at the same area of the wings are formed at different stages. The method of claim 1, The circuit portion A power supply unit supplying signal power for generating the driving signal; And a connection member connecting the circuit unit to the panel and having a driving chip mounted thereon for relaying the driving signal. The method of claim 2, And the multi-stage heat sink is in contact with at least one of the power supply unit and the connection member. The method of claim 2, And the multi-stage heat sink is in contact with the driving chip. The method of claim 1, The multi-stage heat sink is Bottom, A first wing portion extending from the bottom portion and formed so that a wing direction thereof faces a first direction; And a second wing portion formed on the first wing portion and formed so that a wing direction thereof faces a second direction. The method of claim 5, And the angle between the first direction and the second direction is 90 degrees. delete The method of claim 2 The power supply unit plasma display device, characterized in that at least one of an AC-DC converter, a power supply module (IPM). The method of claim 2, And the connecting member is a tape carrier package.

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