KR20060032798A - Plasma display apparatus - Google Patents

Abstract

An object of the present invention is to reduce heat by efficiently dissipating heat generated by a switching element that controls an electrical signal applied in a plasma display panel, and to consume vibration energy generated by 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 switching element for controlling an electrical signal applied to the switching element, and the switching element is attached to at least one surface to emit heat generated by the switching element, and has a plurality of heat dissipation vanes, and at least one of the plurality of heat dissipation vanes. At least one heat sink formed such that the heat dissipation blade has a predetermined curvature, It is disposed so as to cover the heat sink, and provides a plasma display device characterized in that it comprises a noise plate for reducing the noise generated in the switching element.

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 perspective view for explaining the difference between the surface area when the heat-dissipating blade has a curvature and when it is not;

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

<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

98: path of sound waves

100: plasma display panel 130: address electrode driver

140: Y electrode driver 150: X electrode driver

The present invention relates to a plasma display device, and more particularly, to heat radiation and noise reduction of a switching element for controlling an electrical signal applied to a pair of sustain electrodes of 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. Drive the display panel. 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 vibration in the switching elements. At this time, since the switching element is formed of a semiconductor element such as silicon (Si) or germanium (Ge), the electrical characteristics of the switching element are greatly affected by heat. Therefore, if the heat generated by the switching element is not sufficiently released, the heat may cause the switching element to malfunction or lose its function. Therefore, heat dissipation of the switching element is a very important problem.

On the other hand, the vibration generated by the switching element at this time, which is generated by the switching operation of the switching element, causes the air to vibrate or is transmitted to another object to generate considerable noise while vibrating the air. In this case, the noise generated by the switching element may be an important factor among the criteria for determining the quality of the consumer, considering 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 solves the above problems, efficiently dissipates the heat generated by the switching element for controlling the electrical signal applied to the holding electrode pair of the plasma display panel, the vibration energy generated by the switching element is consumed sufficiently It aims to reduce noise by making it possible.

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 switching element for controlling an electrical signal applied to the pairs, and the switching element is attached to at least one surface to dissipate heat generated by the switching element, and includes a plurality of heat dissipation vanes, and among the plurality of heat dissipation vanes. At least one heat-dissipating wing having at least one curvature And a sink and a silencer disposed to cover the heat sink and reducing noise generated by the switching element, thereby providing a plasma display device according to the present invention. The surface area of the heat sink is increased to increase the surface area in contact with air, thereby facilitating heat exchange between the outside air and the heat sink, thereby efficiently dissipating heat generated by the switching element.

On the other hand, the heat-dissipating blade has a cross section perpendicular to the chassis to have a predetermined curvature on one surface of the heat sink in the shape of an arc, the switching element is opposite to the surface on which the heat-emitting wing of the heat sink is formed It is preferable to be attached to the surface, through which, the heat generated from the plasma display panel is not directly conducted to the switching element to prevent the switching element is heated, and the heat generated from the switching element is It conducts to the heat sink to facilitate the release of heat generated by the switching element.

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 heat sink is disposed on the circuit board. Do.

In addition, it is preferable that a thermally conductive material having elasticity is disposed between the sound absorbing plate and the heat sink, and through this, the vibration is canceled while the vibration of the heat sink is transferred to the sound absorbing plate, thereby reducing noise. The physical contact between the heat sink and the silencer is made uniform so that heat conducted to the heat sink can be efficiently discharged through the sound sink.

Meanwhile, in the plasma display panel of the present invention, the sustain electrode pair includes an X electrode and a Y electrode, the X electrode is a common electrode, the Y electrode is a scanning electrode, and the switching elements are X It is preferable to distinguish between the X electrode switching elements for controlling the electrical signal applied to the electrode and the Y electrode switching elements for controlling the 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 which supports the plasma display panel 100 and is formed of aluminum 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. In order to support the plasma display panel, the plasma display panel is disposed behind the plasma display panel 100. 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 is in contact with the rear surface of the plasma display panel 100 to prevent accumulation of 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.

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

In addition, 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. The switching element 70 is attached to at least one surface, has a plurality of heat dissipation vanes 82, at least one of the heat dissipation vanes 82 of the plurality of heat dissipation vanes 82 is formed to have a predetermined curvature One shock sink 80 and a silencer 60 disposed to cover the shock sinks 80 and reducing noise generated by the Y electrode switching element 70 are provided. At this time, the sound absorbing plate 60 not only reduces the noise, but also conducts heat transferred to the heat sink to release heat through heat exchange with air, thereby helping to dissipate the switching element 70.

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. At least one of the switching element 75 is attached to at least one surface so as to have a plurality of heat dissipation vanes 82, and at least one heat dissipation vane of the plurality of heat dissipation vanes has a predetermined curvature. The heat sink 80 and the sound sink 80 are disposed to cover the heat sink 80, and the noise plate 65 which reduces noise generated by the X electrode switching element 75 is provided. At this time, the sound absorbing plate 65, like the sound absorbing plate 60 provided in the Y electrode drive unit, as well as the noise reduction effect, by conducting heat transferred to the heat sink to release heat through heat exchange with air, Help the heat dissipation of the switching element (70).

On the other hand, the heat dissipation blade 82 provided in the heat sink 80 has a cross section perpendicular to the chassis 30 so as to have a predetermined curvature on one surface of the heat sink, and has an arc shape, and the switching element 70 is preferably attached to the surface opposite to the surface on which the heat-dissipating wings of the heat sink 80 are formed.

In this case, when the switching elements 70 and 75 are attached to one surface of the heat sink 80, the switching elements are conducted to the chassis when heat generated in the plasma display panel 100 is conducted to the chassis. It is less affected by heat, thereby preventing the switching element from being heated by heat generated in the plasma display panel 100.

On the other hand, when the heat dissipation vane 82 is formed to have a predetermined curvature, its surface area is increased as compared to when it is a flat plate, thereby increasing the area of contact with air for the same time. At this time, the heat conduction per unit time increases as the contact area of the heat conduction increases, and as a result, the heat conducted to the heat sink is transferred to the air for a faster time, thereby cooling the heat sink 80. At this time, when the heat sink 80 cools faster, the temperature difference between the heat sink and the switching elements 70 and 75 increases, so that the switching element 70 which is attached to one surface of the heat sink 80. Heat generated at 75 may be quickly conducted to the heat sink 80, thereby facilitating cooling of the switching element.

In addition, since the heat dissipation vane 82 is formed to have a predetermined curvature and the surface area thereof is increased, the probability that sound waves generated by the vibration of the switching element collide with the heat dissipation vane increases, thereby generating in the switching element. This reduces noise. Hereinafter, the matters related to the above heat dissipation and noise reduction 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 heat sink 80 is disposed on a circuit board.

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.

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 have a slight difference.

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 FIGS. 5 to 6. 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.

In this case, in general, the switching element 70 is formed of semiconductor elements such as silicon (Si), germanium (Ge), and the like, and the electrical characteristics of the semiconductor elements are greatly affected by heat. Therefore, when the switching element is exposed to heat above a predetermined level, the switching element malfunctions or loses its function. Since this directly affects the image of the plasma display panel, the efficient discharge of heat is essential to maintain the image quality of the plasma display panel.

In addition, while the switching device 70 performs many switching operations for a short time, vibration of the switching device itself is generated in the switching device 70. 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.

Therefore, first, in order to dissipate heat generated by the Y electrode switching element, a separate heat sink 80 is disposed on the printed circuit board 90 rather than attaching the Y electrode switching element to the printed circuit board. The Y electrode switching element is attached to a surface opposite to the surface on which the heat dissipation blade 82 of the heat sink 80 is formed so that the heat generated by the Y electrode switching element 70 is transferred to the heat sink 80. It is desirable to allow the to be delivered.

In this case, when the heat dissipation blade 82 is formed to have a curvature, as shown in FIG. 5, the curvature has the same width l 1, length l 2, and thickness t as the heat dissipation blade 82. Compared with the heat dissipation wing 89 which does not have the surface area, the total surface area thereof is increased, thereby increasing the area of the heat dissipation wing 82 in contact with the outside air. Therefore, when the heat dissipation blade has a curvature, it is possible to more effectively release the heat generated by the switching element.

Therefore, by providing the heat sinking blades 82 with a predetermined curvature of the heat sink 80, the contact surface area of the heat sink with the outside air is increased, and thus generated in the switching element as described above. Can effectively release heat.

On the other hand, the Y electrode switching element 70 generates a vibration causing noise as described above. At this time, if the vibration generated in the switching device can be reduced, the noise generated in the switching device 70 can be reduced. Under this recognition, the noise reduction generated by the switching device of the present invention will be described.

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 sound waves generated by the vibration strike the sound absorbing plate to vibrate the sound absorbing plate. At this time, some of these vibrations are transmitted to the sound absorbing plate 60 and again transmitted to the outside in the form of sound waves by vibrating the air in contact with the sound absorbing plate.

At this time, let's look at the transmission process of the vibration in more detail. As shown in FIG. 6, when the switching element 70 attached to any of the heat sinks 80 operates and transmits the vibration to the heat sinks 80, the heat sinks provided by the heat sinks 80 are provided. The vibration is transmitted to the heat-dissipating blades 82a of the, and the vibrations again cause the sound waves by vibrating the air between the heat-dissipating blades. At this time, the sound wave again hits another heat-emitting wing 82b, thereby vibrating the heat-emitting wing 82b.

In this case, since the heat dissipation blades 82a and 82b are formed to have a predetermined curvature, the surface area in which sound waves collide with the heat dissipation blade is larger than that of the heat dissipation blade without curvature. Therefore, the sound wave is more likely to collide with other heat-emitting blades during the progress of the sound wave compared to the case where the heat-emitting blades having no curvature are provided.

At this time, since the sound waves continuously consume the energy while vibrating air or the heat-emitting blades, the energy consumption increases as the probability that the sound waves collide with the heat-emitting blades increases, and consequently, the heat-emitting blades have a predetermined curvature. By being formed, the energy consumed by the sound waves oscillating the heat-emitting blades is increased.

Therefore, in the end, the vibration initiated in the switching element continuously consumes the energy while vibrating the heat sink with the heat sink having the heat sink and the curvature provided therein, and the energy of the sound wave released into the air becomes smaller, and thus the sound wave The noise transmitted in the form of is reduced.

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.

According to the present invention, the switching element and the heat sink physically contact each other, and the heat dissipation vane provided by the heat sink is predetermined so that the heat generated by the switching element controlling the electrical signal applied to the plasma display panel can be efficiently discharged. The heat dissipation problem of the switching device was solved by forming the curvature.

In addition, by allowing the sound waves generated in the switching element attached to at least one surface of the heat sink to continuously collide with the heat-dissipating blades of the heat sink, the energy is consumed to effectively reduce the noise generated in the switching device.

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 switching element disposed at the rear of the chassis and controlling an electrical signal applied to the pair of sustain electrodes of the plasma display panel; The switching element is attached to at least one surface to emit heat generated by the switching element, and provided with a plurality of heat dissipation vanes, wherein at least one heat dissipation vane of the plurality of heat dissipation vanes is formed to have a predetermined curvature. At least one heat sink; And And a silencer disposed to cover the heat sink, the noise plate reducing noise generated by the switching element. The method of claim 1 The heat dissipation vane has a cross section perpendicular to the chassis so as to have a predetermined curvature on one surface of the heat sink, and the switching element is a surface opposite to the surface on which the heat dissipation wing of the heat sink is formed. Plasma display device, characterized in that attached to. The method of claim 1, 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 heat sink is disposed on the circuit board. 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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