KR100741061B1 - Plasma display apparatus - Google Patents

Abstract

An object of the present invention is to provide a means for reducing noise generated in a switching element for controlling an electrical signal applied in a plasma display panel, and for achieving efficient heat dissipation of the switching element.

In order to achieve this object, the present invention extends to intersect the plurality of discharge cells which are spaces for causing discharge therein, the plurality of sustain electrode pairs crossing the discharge cells and the sustain electrode pair in the discharge cells. Plasma display panel having an address electrode intersecting the discharge cells to implement an image, a chassis supporting the plasma display panel, and a sustain electrode pair disposed at the rear of the chassis and provided in the rear of the chassis. A plurality of switching elements for controlling an electrical signal applied to the plurality of switching elements, a plurality of check sinks attached to at least one surface of the switching element so as to dissipate heat generated by the switching element, and the plurality of check sinks; And a material for reducing noise generated by the switching element and forming the heat sink. It provides a plasma display device characterized in that it comprises at least one sound plate formed of a different material.

Description

Plasma display apparatus

1 is an exploded perspective view showing a plasma display device of the present invention;

2 is a perspective view illustrating a Y electrode driver for controlling an electrical signal applied to a Y electrode of the plasma display device of the present invention;

3 is a perspective view showing an X electrode driver for controlling an electrical signal applied to the X electrode of the plasma display device of the present invention;

4 is an exploded perspective view of a plasma display panel included in the plasma display device of the present invention;

5 is a cross-sectional view of the plasma display device of the present invention taken along the line VV.

<Description of Symbols for Major Parts of Drawings>

1: plasma display device

30: chassis 31: X electrode connection cable

32: Y electrode connecting cable 33: Address electrode connecting cable

60: sound absorbing plate provided in the Y electrode drive unit

65: sound absorbing plate provided in the X electrode drive unit

70: Y electrode switching element 75: X electrode switching element

80: heat sink provided in Y electrode drive unit

85: Heat sink provided in X electrode drive part

100: plasma display panel 130: address electrode driver

140: Y electrode driver 150: X electrode driver

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to means for reducing heat and noise generated in a switching element for controlling an electrical signal applied in a plasma display panel.

Plasma display panels are devices that display images using gas discharge phenomena, and are excellent in various display abilities such as display capacity, brightness, contrast, afterimage, viewing angle, etc., and are being spotlighted as devices that can replace CRTs. In such a plasma display panel, a discharge is generated in a discharge cell filled with a discharge gas by a direct current or an alternating voltage applied between electrodes, and ultraviolet rays emitted from the discharge gas excite a phosphor to emit visible light, thereby realizing an image. do.

The plasma display panel adopts a discharge mechanism that emits light by applying a high voltage to the discharge cells as light emitting means, and the discharge cells of the plasma display panel are driven by applying a predetermined potential to the sustain electrode pairs and the address electrodes. do. In this case, since the potential applied to the electrode is controlled in correspondence with the image signal received from the outside, the switching element for controlling the electrical signal applied to the sustain electrode pairs of the plasma display panel performs a large amount of switching work for a short time. do. This switching operation generates considerable heat and noise in the switching element. At this time, heat generated in the switching element may affect the driving characteristics of the switching element, so proper heat dissipation is required.

On the other hand, the noise generated by the switching element can be an important factor among the criteria for determining the consumer's quality in consideration of the general use of the plasma display panel used as a home display device, thereby securing market competitiveness of the plasma display panel. To do this, the noise must be reduced to an appropriate level.

The present invention is to solve the above problems, to reduce the noise generated in the switching element for controlling the electrical signal applied in the plasma display panel, and provides a plasma display device for providing a means for efficient heat dissipation of the switching element It aims to provide.

In order to achieve the above object, the present invention provides a plurality of discharge cells, which are spaces for generating discharge therein, a plurality of sustain electrode pairs crossing the discharge cells, and crossing the sustain electrode pair in the discharge cells. A plasma display panel having an address electrode extending across the discharge cells to implement an image, a chassis supporting the plasma display panel, and a sustain electrode disposed at the rear of the chassis and disposed at the rear of the chassis; A plurality of switching elements for controlling electrical signals applied to the pairs, a plurality of check sinks attached to at least one surface of the switching elements to dissipate heat generated by the switching elements, and a plurality of check sinks to cover the plurality of check sinks. It is arranged to reduce the noise generated in the switching element, and to mold the check sink It provides a plasma display device characterized in that it comprises at least one silencer formed of a material different from the material, thereby reducing the resonance between the noise plate and the heat sink to efficiently emit the noise generated by the switching element can do.

Meanwhile, in the plasma display device of the present invention, a printed circuit board is disposed on a rear surface of the chassis, the switching element is electrically connected to the printed circuit board, and the plurality of heat sinks are disposed on the circuit board. Do.

In addition, the switching element is preferably disposed on the side of the heat sink is disposed on the circuit board, through which the switching element is generated in the plasma display panel, the heat transferred to the chassis directly to the switching element It can be transmitted to prevent deterioration of the heat radiation characteristics of the switching element.

On the other hand, it is preferable that a thermally conductive material having elasticity is disposed between the silencer and the heat sink, thereby uniformly physically contacting the sound damper and the heat sink to the silencer. In the process of smoothly conducting heat and transmitting the vibration generated from the switching element to the sound absorbing plate through the shock sink, the vibration may be reduced to reduce noise.

Meanwhile, the sustain electrode pair includes an X electrode and a Y electrode, the X electrode is a common electrode, the Y electrode is a scan electrode, and the switching elements are X electrode switching elements for controlling an electrical signal applied to the X electrode. And Y electrode switching elements for controlling an electrical signal applied to the Y electrode.

Hereinafter, a preferred embodiment of the plasma display device of the present invention will be described with reference to FIGS. 1 to 4. The plasma display device according to the present invention uses a front cabinet 10 having a window 11 formed at the front, and a rear surface of the front cabinet 10 to form a phosphor layer by using ultraviolet rays generated during discharge in response to an external image signal. Plasma display panel 100 for realizing an image by emitting light, electromagnetic wave blocking is attached to the front surface of the plasma display panel to block the electromagnetic waves generated during operation of the plasma display panel and harmful to humans and may cause malfunction of other electronic devices The film 112 is provided.

In this case, the electromagnetic wave blocking film 112 is not necessarily attached to the front surface of the plasma display panel, and may be separately fixed to the front cabinet by combining with the tempered glass. In this case, the filter holder is fixed to the rear of the front cabinet, the filter coupled to the electromagnetic wave blocking film and the tempered glass may be fixed to the filter holder.

In addition, the plasma display apparatus includes a chassis 30 that supports the plasma display panel 100 and is formed of aluminum or the like having good thermal conductivity. The chassis discharges heat conducted from the plasma display panel to prevent the temperature of the plasma display panel from rising above an appropriate level, and prevents the plasma display panel from being deformed by heat or damaged by external impact. To this end, it is disposed behind the plasma display panel 100 to support the plasma display panel. The plasma display panel 100 and the chassis 30 may be attached by a double-sided tape (not shown).

On the other hand, since the chassis 30 must support the plasma display panel as described above to prevent the plasma display panel from being deformed or damaged, the chassis 30 must have sufficient rigidity. In order to reinforce the rigidity, the plasma display apparatus includes reinforcing members 40 and 41 disposed on a rear surface opposite to a surface supporting the plasma display panel of the chassis to reinforce the rigidity of the chassis.

Meanwhile, the reinforcing members 40 and 41 may be simply used as a means for reinforcing the stiffness of the chassis. However, the reinforcing members 40 and 41 may be integrated circuit chips on any one surface of the reinforcing members in the reinforcing members of some of the reinforcing members. 34 and the address electrode driver 130 including the connection cables 33 electrically connected to the terminals of the integrated circuit chip, the heat generated from the plasma display panel 100 is disposed in the chassis 30. It is possible to prevent the direct conduction to the address electrode driver 130 through the (), and to increase the surface area with air to induce the release of heat generated in the address electrode driver.

In addition, the plasma display apparatus 1 of the present invention is disposed between the chassis and the plasma display panel, and contacts the rear surface of the plasma display panel 100 to accumulate heat generated when the plasma display panel is driven. A heat conductive sheet 115 formed of an aluminum sheet, a copper sheet, a thermal conductive resin, or the like is provided to prevent it.

In addition, the plasma display apparatus 1 of the present invention is installed at the rear of the chassis 30 and drives the plasma display panel 100, the X electrode driver 150, the Y electrode driver 140, and the address electrode driver ( 130 and a power module 160 for supplying stable power to the driving units 130, 140, and 150.

The Y electrode driver 140 emits heat generated when the Y electrode switching element 70 controls the electrical signal applied to the Y electrode 112 and the Y electrode switching element 70 is driven. It is disposed to cover the heat sink (80) and the heat sink (80), and is formed of a material different from the material forming the heat sink (80) to reduce the noise generated in the Y electrode switching element (70) A silencer 60 is provided.

The X electrode driver 150 emits heat generated when the X electrode switching element 75 controls the electrical signal applied to the X electrode 113 and the X electrode switching element 75 is driven. And a material which is disposed to cover the heat sink 80 and the heat sinks 80, to reduce noise generated by the X electrode switching element 75, and to a material different from the material forming the heat sink 80. A sound plate 65 is formed.

Hereinafter, reasons why the materials forming the sound absorbing plates 60 and 65 and the materials forming the heat sink 80 will be different will be described in detail later.

Meanwhile, printed circuit boards 90 and 95 are disposed on the rear surface of the chassis, and the switching elements 70 and 75 are electrically connected to the printed circuit board through terminals 72 and 74 of the switching element. It is preferable that the plurality of heat sinks 80 are arranged on a circuit board. In addition, the switching elements 70 and 75 may be disposed on a side surface of the heat sink, and through this, heat generated during driving of the plasma display panel 100 and conducted through the chassis is transferred to the switching element. It can be directly affected to prevent adverse effects on the heat dissipation of the switching elements (70, 75), and also allows the heat generated in the switching element can be smoothly discharged through the heat sink (80).

In addition, a thermally conductive material 62 having elasticity may be disposed between the heat sink 80 and the sound absorbing plates 60 and 65, whereby vibration transmitted to the heat sink is transferred to the sound absorbing plate. When transmitted, the thermally conductive material has elasticity, thereby attenuating vibration transmitted to the sound absorbing plate, and dissipating heat transmitted to the heat sink to the outside through the sound absorbing plate.

On the other hand, the heat sink 80 is provided with a plurality of heat dissipation blades 81 to increase the surface area capable of heat exchange with air to effectively release the heat generated by the switching element, but the shape of the heat sink is described above It is not limited to one shape, and various shapes can be changed by increasing the surface area for heat dissipation or providing other means.

Hereinafter, a plasma display panel provided in the plasma display apparatus of the present invention will be briefly described with reference to FIG. 4. The plasma display panel 100 of the present invention includes a front panel 110 and a rear panel 120, and the front panel 110 includes a front electrode 111 and a Y electrode formed on the rear surface 111a of the front substrate. Sustain electrode pairs 114 including the 112 and X electrodes 113, a front dielectric layer 115 covering the sustain electrode pairs, and a protective film 116 covering the front dielectric layer.

Each of the Y electrode 112 and the X electrode 113 includes transparent electrodes 112b and 113b formed of ITO and the like and bus electrodes 112a and 113a made of a metal having high conductivity. The bus electrodes 112a and 113a are connected to the Y electrode connecting cable 32 and the X electrode connecting cable 31 disposed on the left and right sides of the plasma display panel 100.

The rear panel 120 includes a rear substrate 121, address electrodes 122 formed on the front surface 121a of the rear substrate 121 to cross the sustain electrode pair 114, and a rear dielectric layer covering the address electrodes. 123, a partition wall 130 formed in the rear dielectric layer 123 to partition discharge cells 126, which are spaces for generating discharge, and a phosphor layer 125 disposed in the discharge cells. The address electrodes 122 are connected to the address electrode connection cable 33 disposed above and below the plasma display panel.

Meanwhile, the plasma display panel 100 may be driven by various driving methods. In general, the plasma display panel 100 may be driven by a dual address discharge separation (ADS) driving method. In this case, 60 different image frames must be implemented to express a moving image of one second on the plasma display panel. In order to implement such image frames, the ADS driving method includes eight subfields including reset discharge, address discharge, and sustain discharge. One image frame having 256 gradations is implemented by using. At this time, the sustain discharge functions to display the gray scale in the selected discharge cell 126 by using the wall charges accumulated in the discharge cell 126 by the address discharge, so that the X of the sustain electrode pair 114 is used only for the sustain electrode discharge. It is not necessary to apply a separate electrical signal to each of the electrodes and each of the Y electrodes, but since the discharge cell must be selected together with one of the sustain electrode pairs 114 for the address discharge, one of the sustain electrode pairs The electrode of must be a scan electrode, and thus, the Y electrode 112 can be a scan electrode, and in this case, the X electrode is preferably the common electrode 113.

For this reason, the number of switching elements 70 included in the Y electrode driver for controlling the electrical signal applied to the Y electrode 112 is the X electrode driver for controlling the electrical signal applied to the X electrode 113. In general, the X electrode driver 150 and the Y electrode driver 140 may be slightly different from the number of the switching elements 75 provided in the X-ray driver. 65 and the silencer 60 provided in the Y electrode driving unit may have different sizes.

However, the function of the switching element is not significantly different, and therefore, the problems of heat dissipation and noise reduction occur in both the X electrode switching element 75 and the Y electrode switching element 70, and a method of solving the problem is also common. Do.

Hereinafter, the heat dissipation and noise reduction of the switching element of the present invention will be described with reference to FIG. 5. At this time, as described above, the problems of heat and noise generated in the X electrode switching element 75 or the Y electrode switching element 70 are common to each other, and the solutions thereof are also common. Only the reduction of heat and noise generated in the switching element will be described.

As described above, the plasma display panel 100 of the present invention must perform discharges including reset discharge, address discharge, and sustain discharge in one subfield. Then, these subfields are selected to form one image frame that implements a screen for 1/60 second. Therefore, in order to drive the plasma display panel, a large amount of electrical signals must be applied to the Y electrodes 113 for a short time. For this purpose, a large number of Y electrode switching elements 70 for controlling the electrical signals are applied for a very short time. Switching work must be performed. This switching operation generates a large amount of heat in the Y electrode switching element 70, and also generates vibration of the switching element itself. And, the vibration generated in the switching element vibrates air to generate sound waves. At this time, the vibration generated in the switching element has a considerable level of energy, causing noise of high frequency to the extent that a person may feel uncomfortable.

In this case, first, in order to dissipate heat generated in the Y electrode switching element, a separate heat sink 80 is disposed on the printed circuit board 90 rather than being attached to the Y electrode switching element. Preferably, the Y electrode switching element is attached to the side of the heat sink 80 so that the heat sink 80 receives heat generated from the Y electrode switching device 70.

At this time, the heat sink 80 is provided with a plurality of heat dissipation blades 82 to increase the surface area in contact with the air it is possible to perform the heat dissipation faster than the switching element through heat exchange with the outside air, Accordingly, heat dissipation of the switching element may be smoother.

On the other hand, the Y electrode switching element 70 generates a vibration causing noise as described above. At this time, since the Y electrode switching element is in physical contact with the heat sink 80, vibration generated in the Y electrode switching device is transmitted to the heat sink. At this time, the vibration vibrates the heat-dissipating blade 82 of the heat sink, air is vibrated by the vibration of the heat-dissipating blade, and the sound waves generated by the vibration are blown onto the sound absorbing plate 60 to disassemble the sound absorbing plate 60. The vibration of the switching element 70 transferred to the heat dissipation blade 82a of the heat sink, which is attached to the rear surface of the silencer 60 or to the rear surface of the thermal conductive material 62 attached to the silencer. Vibration is transmitted to the sound plate 60 to vibrate the sound plate 60.

The vibration wave generated in the switching element during the transmission of this series of vibrations consumes its energy, thereby reducing the noise generated in the switching element.

However, when the silencer 60 and the heat sink 80 are formed of the same material, the following problem occurs. That is, in general, the natural frequency of an object is given by f = 2π * (k / m) ^0.5 . In this case, k is an inherent elastic modulus of the object, which depends on the material and shape of the object. In this case, in the case of the shape of an object, if the materials are the same even when the shape of the object is exactly the same, the natural frequencies may be the same or similar between the objects, but the characteristics of the shape may be different even when the shapes are different. If there is a coincidence, the natural frequencies can be the same or similar.

For example, between the plates, the sizes of the plates are different from each other, but there is a similarity of a certain shape between the plates, and when the difference is a difference in size, they may have similar natural frequencies.

At this time, since the shape of the silencer 60 and the heat sink 80 are different from each other, it can be seen that there is no similarity of the shape. However, in a series of processes in which the noise generated by the switching element 70 is transmitted to the heat sink 80 and transmitted to the sound absorbing plate 60, a substantial portion of the vibration generated by the switching element is transmitted to the sound absorbing plate ( 60 is transmitted to the heat dissipation blade 82a of the heat sink attached to the rear of the heat sink, and the vibration transmitted to the heat dissipation blade 82a is transmitted to the sound absorbing plate 60 to vibrate the sound absorbing plate. At this time, since the shape of the heat-dissipating wing of the heat sink is also in the form of a flat plate, and the shape of the silencer is also in the form of a flat plate, there is a similarity between the shapes, whereby the natural frequencies are likely to be the same or similar. In addition, when the natural frequencies are similar to each other due to the same material between the heat sink 80 and the silencer 60, the vibration is generated in the process of transmitting the vibration between the heat sink and the silencer. Even if the noise generated in the switching element is amplified or reduced, it is difficult to reduce the predetermined level.

At this time, since the plasma display panel is generally used as a home display device, the problem caused by the noise degrades the quality of the plasma display panel and is received from consumers. Therefore, solving this noise problem is very important problem.

Therefore, in order to solve the above-mentioned problem, the material forming the shock sink 80 and the material forming the silencer 60 should be different from each other.

On the other hand, the above description has been described taking the Y electrode driver 140 as an example, it is obvious that the same can be applied to the X electrode.

The present invention solves the heat dissipation problem of the switching element by physically contacting the switching element and the heat sink in order to efficiently dissipate heat generated by the switching element that controls the electrical signal applied to the plasma display panel.

In addition, the noise generated in the switching element is reduced by preventing the amplification of the noise due to the resonance generated between the switching element attached to at least one surface of the heat sink and the noise plate. Through this, the market competitiveness of the plasma display panel was increased.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (5)

A plurality of discharge cells that are spaces for causing discharge therein, a plurality of sustain electrode pairs crossing the discharge cells, and address electrodes extending across the discharge cells to intersect the discharge electrode pairs in the discharge cells; A plasma display panel configured to implement an image; A chassis supporting the plasma display panel; A plurality of switching elements disposed at the rear of the chassis and controlling electrical signals applied to sustain electrode pairs of the plasma display panel; A plurality of heat sinks attached to at least one surface of the switching element to dissipate heat generated by the switching element; It is disposed so as to cover the plurality of heat sinks, to reduce the noise generated in the switching element, and comprises at least one sound plate formed of a material different from the material forming the heat sink, And the plurality of switching elements are disposed on a side of the heat sink. The method of claim 1, A printed circuit board is disposed on the rear surface of the chassis, the switching element is electrically connected to the printed circuit board, and the plurality of heat sinks are disposed on the printed circuit board. delete The method of claim 1, And a thermally conductive material having elasticity between the silencer and the heat sink. The method of claim 1, The sustain electrode pair includes an X electrode and a Y electrode, the X electrode is a common electrode, the Y electrode is a scan electrode, and the switching elements are X electrode switching elements and Y for controlling an electrical signal applied to the X electrode. And a Y electrode switching element for controlling an electrical signal applied to the electrode.

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