KR100669791B1 - Plasma display module - Google Patents

Abstract

An object of the present invention is to provide a plasma display module capable of suppressing distortion of a driving waveform under the influence of an inductance induced by an alternating current flowing therein when the plasma display module operates. To this end, the present invention provides a plasma display panel, a chassis base attached to the rear panel of the plasma display panel through a double-sided adhesive tape, an X drive board and a Y drive board mounted on the chassis base, and the plasma display panel; A plasma display module including a tape carrier package (TCP) connecting the X driving board and the Y driving board includes a grounding portion for grounding the rear panel of the plasma panel and the chassis base.

Driving waveform stabilization, distortion, inductance, plasma display module.

Description

Plasma display module

1 is an exploded perspective view of a general plasma display device;

FIG. 2 is a cross-sectional view of the plasma display module, which is generally illustrated to explain why an electrical signal becomes unstable in the plasma display module.

3 is a cross-sectional view of a plasma display module having means capable of suppressing an unstable electrical signal according to an embodiment of the present invention;

4 is an exploded perspective view of a plasma display device including the plasma display module of FIG. 3;

5 is another cross-sectional view of a plasma display module having means capable of suppressing an electrical signal from becoming unstable by another embodiment of the present invention;

6 is a perspective view illustrating the conductive material used in the plasma display module according to the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: plasma display device, 101: plasma display module,

110: grounding portion, 111: cushioning material,

112: conductive layer, 113: mesh conductive material,

114: conductive material, 120: plasma display panel,

122: front panel, 124: rear panel,

125: electromagnetic wave shielding film, 130: thermal conductive sheet,

133: double-sided adhesive tape, 140: chassis base,

150: drive circuit portion, 152: tape carrier package (TCP),

154: Y drive board, 155: circuit driving element,

156: X drive board, 160: shield plate,

170: case, 171: front case,

172: rear case.

The present invention relates to a plasma display device, and more particularly, to a plasma display module having a means for preventing an electrical signal applied to electrodes installed in a plasma display panel from being distorted and deteriorating image quality.

In general, a plasma display panel is an apparatus for displaying an image by using a gas discharge phenomenon. The plasma display panel is easily enlarged in size and relatively excellent in various display capacities such as display capacity, brightness, contrast, afterimage, viewing angle, and the like. It is attracting attention as a device that can replace the tube. In such a plasma display panel, a discharge occurs 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 the phosphor to emit visible light. To achieve a desired image.

In this case, the quality of the image implemented by the above-described image is an important criterion for determining the quality of the plasma display apparatus. Therefore, each plasma display device manufacturer is making various efforts to improve the image quality.

Accordingly, in order to improve image quality, each plasma display device manufacturer compensates for structural problems of the plasma display panel by improving the quality of phosphors disposed inside the panel, correcting color temperature to implement natural colors, and increasing contrast ratio. To make a variety of efforts.

However, even if the above-mentioned efforts are made to improve the image quality, if the electric signal generated in response to the image signal received from the outside is distorted in the process of being applied inside the plasma display panel, an effort to improve the image quality of the plasma display panel is actually implemented. It may not be reflected in the image, thereby losing the product competitiveness of the plasma display device.

1 is an exploded perspective view of a conventional plasma display device according to the prior art.

Referring to FIG. 1, the plasma display panel 120 includes a front panel and a rear panel (see FIG. 2). In addition, an electromagnetic wave blocking filter 125 is installed on the front surface of the plasma display panel 120. The electromagnetic wave blocking filter 125 shields electromagnetic waves harmful to a human body generated when the plasma display panel 120 is driven. The floor is installed.

The chassis base 140 is disposed on the rear surface of the plasma display panel 120. A plurality of through holes are formed in the chassis base 140 to release heat generated from the plasma display panel 120 to the outside. The plasma display panel 120 is fixed to the chassis base 140 by a double-sided adhesive tape 133. The thermal conductive sheet 130 is interposed between the plasma display panel 120 and the chassis base 140. The heat conductive sheet 130 may discharge heat generated from the plasma display panel 120 to the outside via the chassis base 140.

The driving circuit unit 150 is mounted on the rear side of the chassis base 140. Electronic components for operating the plasma display panel are mounted in the driving circuit unit 150. The electronic components include components for supplying power to the plasma display panel 120 and components for applying an electrical signal to implement an image.

The above-described plasma display module is accommodated by the case 170 and made of the plasma display apparatus 100. The case 170 is divided into a front case 171 and a rear case 172. On the other hand, the driving circuit elements 155 mounted on the Tape Carrier Package (152) are connected to the plasma display panel 120 when they are coupled to receive electrical signals. The TCP 152 is protected by a shield plate 160.

FIG. 2 is a cross-sectional view of the plasma display module, which is generally illustrated to explain why an electrical signal becomes unstable in the plasma display module.

Referring to FIG. 2, when an alternating current flows through the driving circuits mounted on the chassis base 140 of the general plasma display panel 101, for example, the conductive lines in the Y driving circuit 154 and the X driving circuit 152, a magnetic field is generated. When the alternating current flows with time, the magnetic field changes with time, and electromotive force is induced according to Faraday's law, and its polarity appears in the direction of disturbing the flow of current according to Lenz's law. In the drawings, reference numeral 130 denotes a thermal conductive sheet, 133 denotes a double-sided adhesive tape, and 152 denotes TCP.

In detail, the plasma display panel 120 includes discharge cells, which are spaces for discharging therein, and forms an electric field in the discharge cells so that charged particles are accelerated. A predetermined potential is applied to the Y electrodes and the address electrodes to implement an image.

In this case, there are various driving methods depending on how the potential is applied to the electrodes (not shown), and thus an image is realized. However, the current method is the ADS driving method, and since this driving method forms the basis of other driving methods, the driving of the plasma display panel 120 of the present invention will be briefly described based on this driving method. do.

In order to implement an image in response to an external image signal on the plasma display panel 120, each of 60 image frames must be able to express 256 gray scales per second, and each frame is completely separated in time. Should be. That is, 60 independent image frames can be expressed to express a 1 second video. By the way, the plasma display panel of the alternating current three-electrode structure adopts a structure in which visible light is emitted by wall charges accumulated in the discharge cells by the address discharge and sustain discharge generated by the help of the wall charges.

Therefore, in order to realize an image in consideration of this characteristic, subfields consisting of a series of reset discharges, address discharges, and sustain discharges are divided into eight to determine one image frame, and the sixty image frames are continuous for one second. It is implemented as a video.

In this case, in order for 60 image frames to be continuously implemented for one second, the pulse potential, which changes with time, is applied to the X electrodes, the Y electrodes, and the address electrodes in a suitable state for a short time. In particular, since the X electrodes and the Y electrodes are responsible for sustain discharge, the X electrodes and the Y electrodes must be applied with a large number of pulse potentials in a short time to display the determined gray scale.

Therefore, in the end, the pulse potential, which is an electrical signal applied to the X electrodes and the Y electrodes, continuously changes over time. As the pulse potential that changes with time is applied, the electric field generated inside the plasma display panel eventually changes with time. In addition, the current flowing through each of the X electrodes and the Y electrodes also changes with time, and eventually, the magnetic field generated by the current also changes.

Since the X electrodes and the Y electrodes act as vibrators such as antennas, electromagnetic waves are generated by electrical signals applied to the X electrodes and the Y electrodes, as can be seen from the Maxwell equation.

At this time, the electromagnetic waves eventually affect the other X electrodes and the Y electrodes, and thus, although the X electrodes and the Y electrodes are not electrically connected to each other, the electromagnetic waves propagate along various media. In addition, currents induced by electromagnetic waves are generated along the X electrodes adjacent to the Y electrodes.

On the other hand, the electromagnetic wave also affects the chassis base 140 formed of aluminum or the like. In this case, the X electrode and the Y electrode are disposed between the front panel 122 and the rear panel 124. Induced current flowing from the Y driving board 154 as shown by the arrow 2 to the X driving board 156 across the plasma display panel 120 is generated.

In this case, the induced current is not a signal generated in response to an external image signal, such as an electrical signal applied to each of the X electrodes and the Y electrodes, but is a kind of noise and distorts the electrical signal applied to the X electrodes and the Y electrodes. To change the waveform. As a result, the image quality of the plasma display panel 120 is degraded.

The technical problem to be achieved by the present invention is to provide a plasma display module that can stabilize the driving pulse by installing a grounding portion for grounding the rear panel and the chassis base of the plasma display panel to solve the above problems.

Plasma display module according to the present invention to achieve the above technical problem, ① the plasma display panel consisting of a front panel and a rear panel, ② the chassis base attached to the rear panel of the plasma display panel via a double-sided adhesive tape, ③ An X drive board and a Y drive board mounted on the chassis base, ④ a tape carrier package (TCP) connecting the plasma display panel, the X drive board and the Y drive board, ⑤ a rear panel of the plasma panel and the chassis And a ground part for grounding the base.

According to a preferred embodiment of the present invention, the plasma display module may further include a heat conductive sheet interposed between the chassis base and the rear panel of the plasma display module.

In addition, according to a preferred embodiment of the present invention, it is preferable that the ground portion includes a conductive layer made on the rear surface of the rear panel, and a conductive material electrically connected to the conductive layer and the chassis base to ground. The conductive layer may be any one selected from a transparent electrode (ITO), a conductive film, and a metal electrode material, and the conductive material may include an internal buffer material and an external conductive material surrounding the buffer material.

Preferably, the metal electrode material is any one selected from the group of metal materials consisting of silver, chromium-copper-chromium composite layers, aluminum and nickel, and the buffer material is a buffer material group consisting of silicon, rubber, foamed resin, and sponge. Any one selected from among, wherein the outer conductive material is to surround the buffer in a mesh (mesh type), the outer conductive material selected from the group of metal materials consisting of copper, aluminum and alloys of berylnium and copper (BeCu) One is suitable.

In addition, the sponge is suitably a sponge for electromagnetic interference (EMI) shielding.

On the other hand, the thermally conductive sheet is preferably any one selected from the group of thermally conductive materials consisting of silicon sheet, acrylic sheet, urethane sheet, foam sheet and graphite sheet.

According to the present invention, in the plasma display module, a grounding part for grounding the rear panel and the chassis base of the plasma display panel may be installed to reduce the induced electromotive force by inductance, thereby stabilizing the driving pulse, thereby improving the image quality of the plasma display apparatus. . In addition, electromagnetic interference (EMI) emitted from the rear pattern can be shielded through the conductive layer of the added ground. Finally, heat generated in the plasma display panel may be simultaneously released through the ground portion and the thermal conductive sheet.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments disclosed in the following detailed description are not meant to limit the present invention, but to those skilled in the art to which the present invention pertains, the disclosure of the present invention may be completed in a form that can be implemented. It is provided to inform the category.

3 is a cross-sectional view of a plasma display module having means capable of suppressing an electrical signal from becoming unstable according to an embodiment of the present invention.

Referring to FIG. 3, the plasma display module 101 according to the present invention includes a plasma display panel 120 including a front panel 122 and a rear panel 124, and a rear panel 124 of the plasma display panel. The chassis base 140 attached through the double-sided adhesive tape 133, the X driving board 156 and the Y driving board 154 mounted on the chassis base 140, the plasma display panel 120 and the Tape carrier packages (TCP, 152) connecting the X driving board 156 and the Y driving board 154, and a grounding part for grounding the rear panel 124 and the chassis base 140 of the plasma panel. Consists of 110.

The ground portion 110 is a major means for achieving the object of the present invention. That is, as mentioned in the prior art, as the amount of the dielectric current (arrow in FIG. 2) is reduced, the electrical signals applied to the X electrodes and the Y electrodes can be processed into driving waveforms corresponding to the image signals accurately. The image quality of the plasma display panel 120 may be improved. Therefore, the induced current flows in the closed loop section in the directions of the Y driving circuit 154, the plasma display panel 120, and the X driving circuit unit 156, and X in the plasma display panel 120 is caused by the induced current. Since the driving waveform, which is an electrical signal applied to the electrodes and the Y electrodes, is distorted, it is essential to reduce the induced current serving as the pseudo inductor.

As a result, if the inductance of the inductor formed through the current flow of the closed loop is reduced, the problem that the driving waveforms applied to the X and Y electrodes is distorted can be reduced.

To this end, in the present invention, the inductance generated from the induced current of the closed loop path is provided by installing a grounding unit 110 that grounds the rear panel 124 of the plasma panel and the chassis base 140. Reduce

The ground portion 110 is a conductive layer 112 formed on the rear surface of the rear panel 124, and the conductive layer 112 is electrically connected to the chassis base 140 to form a conductive path Made of ash 114A. Therefore, since the induced current flowing in the plasma display panel 120 is grounded to the chassis base 140 through the conductive layer 112 and the conductive material 114A, which are the grounding parts 120, the induced current generated through the closed loop section is obtained. Grounding can be prevented.

4 is an exploded perspective view of a plasma display device including the plasma display module of FIG. 3.

Referring to FIG. 4, it can be seen that the conductive material 114A, which is symmetrical to the illustration of FIG. 3, is installed inside the double-sided adhesive tape 133 at the edge of the thermally cut sheet 130 in the plasma display panel 120. Although not shown, a conductive layer (112 in FIG. 3) is formed on the rear panel of the plasma display panel 120.

FIG. 5 is another cross-sectional view of a plasma display module having means capable of suppressing an unstable electrical signal by another embodiment of the present invention, and FIG. 6 is used in a plasma display module according to an embodiment of the present invention. It is a perspective view shown in order to demonstrate a electrically conductive material.

Referring to FIGS. 5 and 6, in FIG. 3, two conductive materials 114A are formed at the edges, but in this embodiment, the thermal conductive sheet 130 is divided into two and the conductive material 114B is attached to the center portion. Transformed into. Therefore, it can be seen that the method of forming the grounding unit 110 can be modified in various ways by those skilled in the art.

The conductive layer 112 may be formed using a transparent electrode (ITO), and may be formed by attaching a conductive film or by depositing a metal electrode material. The metal material may be formed using a composite layer of silver (Ag), chromium-copper-chromium (Cr-Cu-Cr), aluminum (Al), nickel (Ni), and the like. The conductive layer 112 is excellent in thermal conductivity, thereby rapidly transferring heat generated by the discharge from the plasma display panel 120 to the thermal conductive sheet 130, thereby quickly uniformizing the temperature of the plasma display panel 120. Perform. The thermally conductive sheet 130 may be made of any one selected from a group of thermally conductive materials including a silicon sheet, an acrylic sheet, a urethane sheet, a foam sheet, and a graphite sheet.

In addition, the conductive material 114B has a buffer material 111 inside thereof, as shown in FIG. 6, and an outer conductive material 113 wraps around the buffer material 111 in a mesh type in order to be conductive. Can be. Therefore, since the conductive material 114B has a buffer property, external vibrations and shocks are transmitted to the plasma display panel 120 as it is, thereby protecting the damage from occurring.

The shock absorbing material 111 may be made of silicon, rubber, foamed resin, sponge, or the like. In this case, when the shock absorbing material 111 is used for EMI shielding, electromagnetic waves emitted from the rear panel 124 are absorbed by the conductive layer 112 and grounded to the chassis base 140. In addition, the outer conductive material 113 surrounding the cushioning material 111 in a mesh shape may be made of a metal having excellent conductivity such as copper, aluminum, an alloy of berylnium, and copper (BeCu). The external conductive material 113 electrically connects the conductive layer 112 and the chassis base 140 by an adhesive means having conductivity.

Therefore, according to the present invention described above, in the plasma display module, by installing a grounding portion for grounding the rear panel and the chassis base of the plasma display panel, first, by reducing the induced electromotive force by inductance to stabilize the driving pulse of the plasma display apparatus You can improve the picture quality. Second, electromagnetic interference (EMI) emitted from the rear pattern may be shielded through the conductive layer of the added ground portion. Third, heat generated in the plasma display panel may be simultaneously released through the ground portion and the heat conductive sheet.

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 (11)

A plasma display panel comprising a front panel and a rear panel; A chassis base attached to a rear panel of the plasma display panel through a double-sided adhesive tape; A thermal conductive sheet interposed between the chassis base and a rear panel of the plasma display panel; An X driving board and a Y driving board mounted on the chassis base; A tape carrier package (TCP) connecting the plasma display panel to the X driving board and the Y driving board; And And a ground part configured to ground the rear panel of the plasma panel and the chassis base. delete The method of claim 1, The ground portion and the conductive layer made on the back of the rear panel, And a conductive material electrically connected to the conductive layer and the chassis base to ground. The method of claim 3, And the conductive layer is any one selected from a transparent electrode (ITO), a conductive film, and a metal electrode material. The method of claim 4, wherein The metal electrode material is any one selected from the group of metal materials consisting of silver, chromium-copper-chromium composite layers, aluminum and nickel. The method of claim 3, The conductive material is a plasma display module, characterized in that it comprises a buffer therein and an external conductive material surrounding the buffer. The method of claim 6, The buffer material is a plasma display module, characterized in that any one selected from the group of buffer materials consisting of silicone, rubber, foamed resin and sponge. 8. The plasma display module of claim 7, wherein the buffer material is for shielding electromagnetic interference (EMI). The method of claim 6, The external conductive material is a plasma display module, characterized in that for wrapping the buffer in a mesh (mesh type). The method of claim 6, The external conductive material is any one selected from the group of metal materials consisting of copper, aluminum and alloys of berylnium and copper (BeCu). The method of claim 1, The thermally conductive sheet is any one selected from the group of thermally conductive materials consisting of silicon sheets, acrylic sheets, urethane sheets, foam sheets and graphite sheets.

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