KR20060128156A - Cover plate and plasma display device using the same - Google Patents

Abstract

A protective plate and a plasma display panel having the same are provided to increase cooling efficiency by easily convecting air flowing along a rear surface of a chassis, thereby preventing deterioration of an image quality. A protective plate is connected to a chassis of a plasma display panel to fix a signal line connecting the panel and a circuit part. At least a portion of the protective plate horizontally installed to a screen is divided in a horizontal direction. The portion to be divided is a rear portion extended towards a rear portion of the chassis or a lower portion extended towards the rear portion of the chassis from an upper portion. The number of the portion to be divided is changed according to the number of the signal lines.

Description

Protective plate and plasma display device using the same {Cover plate and Plasma display device using the same}

1 and 2 are partial cross-sectional views of a plasma display device which briefly shows a heat dissipation structure of these conventional drive chips;

3 and 4 are exploded perspective views of plasma display device embodiments according to the present invention.

* Explanation of symbols for the main parts of the drawings

10: panel display panel (PDP) 11, 13 substrate

20,25: heat transfer medium 30,30 ': chassis base

33: reinforcement part 40,140,240,340,440: protective plate

50: Tape Carrier Package (TCP) 51: Chip

21: double sided tape 60: circuit board

37,137: Stiffener

The present invention relates to a plasma display device, and more particularly, to a protective plate of a plasma display device.

The plasma display device is formed by forming a plasma display panel and installing elements necessary for screen realization such as a driving circuit connected to each electrode of the panel.

In a plasma display panel, each pixel is represented through discharge in that pixel region. The power required to discharge is eventually lost to light, but most of it is converted to heat in the panel. Materials such as phosphors that form the panel become a problem because they tend to deteriorate and denature when the temperature increases, and the life is shortened. In addition, overheating in the panel, in particular partial overheating, may cause thermal expansion deformation and subsequent stress of the glass plate, which is the substrate of the panel, and may cause breakage.

On the other hand, the driving circuit connected to the electrodes of the plasma display panel consumes a lot of power to implement the screen. The consumption of power eventually means heat generation, and when the driving circuit is overheated, it is likely to malfunction in the circuit operation. This malfunction may cause a problem that the quality of the screen is degraded, for example, to cause the discharge to occur even in the pixel portion that should not be discharged. Therefore, an important technical problem is how to effectively release heat generated from a driving circuit in which heat is concentrated in a plasma display device. In particular, heat generation is concentrated, such as the drive chip portion of a tape carrier package (TCP) that connects the address electrode of the panel and the rear driving circuit portion, and heat dissipation is difficult for cooling unless heat contact with the heat sink is performed separately. This is a problem.

In general, in the plasma display device, a chassis attached to the rear surface of a panel is generally used to dissipate heat from a heat generating part such as a panel and a driving circuit to the outside. For this role, the chassis is usually formed of a metal, such as aluminum, which has good thermal conductivity. The chassis is typically made by coupling the reinforcement to the plate-shaped chassis base. The chassis base peripheral end may be integrally formed with a reinforcement bent to resist deformation.

However, in the case of TCP, chip on film (COF), etc., in which a driving chip is connected to a signal electrode connected to a pixel of a plasma display panel and a driving circuit for driving the electrodes and a driving chip is mounted on a path thereof, the driving chip is used. Cooling is particularly problematic.

To describe this problem in more detail below, the driving chip in TCP or COF is not installed on a separate circuit board unlike other driving circuit elements. That is, if there is no separate fixing structure, the driving circuit unit is positioned in the middle of the signal line connecting the electrode of the panel and is positioned in the air like the signal line. However, the driving chip installed in TCP or COF generates a lot of heat, and direct heat radiation into the air is not efficient. Therefore, one side of the driving chip is in contact with the bent peripheral end or the reinforcement of the chassis base, and the other side is provided with a protective plate capable of fixing and protecting the signal line and the driving chip so as to contact the protective plate.

1 and 2 are partial sectional views of the plasma display device, which briefly show examples of heat dissipation structures of these drive chips.

In FIG. 1, the driving chip 51 of the TCP 50 is attached to the stiffener 37 of the chassis through the heat conducting medium 25, and thermal contact between the two is made. In FIG. 2, the chassis base 30 is illustrated. The driving chip 51 of the TCP 50 is sandwiched between the reinforcement part 33 and the protection plate 40, which are bent peripheral edges of the bent state, and are installed without a separate heat conductive medium. Although not shown, a TCP driving chip is sandwiched between the bent reinforcement part 33 and the protection plate of the chassis base, and unlike FIG. 2, a case in which a thermal conductive medium is interposed between them and TCP, respectively. 1, the protection plate is omitted.

By the way, the protection plate is usually formed in the form of an angled or single-shaped plate, it is integrally installed along the sides on the upper and lower sides of the screen of the plasma display device. Thus, when the protective plate is engaged with the bent peripheral end or reinforcement of the chassis base, it often interferes with the vertically rising air flow while contacting the rear of the chassis base. In particular, when the address electrode receives the data signal through the upper and lower sides of the screen by a double scan method, a reinforcement and a protection plate for fixing the TCP for the address electrode installed on the upper side extends long from the upper side of the chassis to the rear of the screen, If the protective plate is formed long from the upper side to the lower side to serve as a heat sink, the flow of air that takes heat away from the chassis base and the circuit part through convection is stagnated by the protective plate, thereby causing an integrated circuit chip of TCP. Heat builds up in the upper part of the chassis.

This congestion of the flow of convective air reduces the cooling efficiency of the plasma display device, and causes abnormality in the functions of the integrated circuits used to drive the electrodes due to heat, resulting in deterioration of image quality due to malfunction or deterioration of life. The risk increases.

The present invention is to solve the problem that the protection plate is formed long along the upper side or the lower side of the panel constituting the screen in the conventional plasma display device to hinder the flow of convective air.

An object of the present invention is to provide a protective plate having a configuration capable of smoothly flowing air on the back of the chassis and a plasma display device having the protective plate.

In other words, an object of the present invention is to provide a plasma display device capable of improving cooling efficiency and a protective plate for a plasma display device used therein.

The protection plate for the plasma display device of the present invention for achieving the above object is characterized in that at least a portion of the protection plate installed laterally relative to the screen is separated laterally.

In the present invention, the separated portion may be at least a portion of the rear portion extending rearward from the protection plate or the portion extending downward from the upper side, and the separated portion of the protection plate may be formed according to the number of signal lines such as TCP used in the plasma display device. It may be composed of a plurality of parts in contact with each signal line.

In addition, the protective plate may be formed by dividing the whole piece into several pieces, or may be integrally formed by connecting all the front parts thereof, or may have a shape in which the rear part is divided laterally by forming slits or grooves in the longitudinal direction. Do.

In the present invention, the protective plate may be applied to all those installed on the upper side lower side of the substrate constituting the screen, in particular, the rear portion is separated on the basis of the screen when viewed from the front side to form the screen formed in the upper side is convection There are many effects in terms of ease of use.

The plasma display device of the present invention for achieving the above object is characterized in that the rear portion or the lower end is provided with a protective plate separated into a groove or a slit.

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

3 is a partially exploded perspective view illustrating a module portion of the plasma display device in which the upper angle protective plates 140 and 240 are separated by the same number as the number of TCP 50 according to one embodiment of the present invention.

FIG. 4 is an exploded perspective view of a portion of a plasma display device module showing upper-side one-sided protection plates 340 and 440 divided into several parts by having grooves formed only below the screen reference according to another exemplary embodiment of the present invention. Here, the protection plates 340 and 440 are not completely separated as in the embodiment of Fig. 3, but the grooves are formed only at the lower end side.

In recent years, the chassis base itself has become thinner for lighter weight, thereby increasing the role of the heat sink of the protective plate. As a result, protective plates are being formed to extend from the sides to the center with respect to the screen. In addition, in the case of the angle type, since the horizontal part 141 and the vertical part 143 surround the plasma display module, resonance tends to occur along with the vibration source of the panel and the circuit part, and thus it is often replaced by a single plate. The partially detachable protective plate of FIG. 4 reflects this tendency, and has a shape extending in a downward direction in a single shape. The lower portion that is not directly in contact with the side reinforcement portion of the chassis base has long grooves. Thus, the upper portion of the protective plate that contacts the chassis base is not separated so that heat can be released in all directions of the protective plate in the integrated circuit chip of TCP. Once the heat of the integrated circuit chip is evenly released in various directions above the protective plate, the released heat can be dissipated into the air as it is transferred to the lower part separated from each part.

In such an embodiment, the lighter air absorbs heat from the chassis base and the circuit board and ascends along the rear of the chassis base while accelerating convection, allowing it to escape the gap of the split protective plate and continue to rise. Conventionally, when the rising flow is blocked by the protection plate together with the reinforcement of the upper end of the chassis and the periphery of the chassis base, the air cooling action is more effective in the present invention when considering that the air flows out by changing the direction to the left or right or bypassing. It can be done smoothly.

In addition, the protective plate is divided into the extended lower end to form a plurality of parts, but the parts in contact with the chassis base reinforcement is formed integrally to form a single part. Therefore, it is preferable to reduce the inconvenience of fixing the completely separated protection plate to the chassis base one by one according to the number of TCP.

In the plasma display device, since the heat dissipation is smooth and the cooling efficiency is increased by the module's own configuration, a separate cooling blower may not be installed, which helps to free space use and light weight. In addition, it is possible to reduce the cost burden of parts omitted, and to reduce the motor noise due to the operation of the blower.

Referring to FIGS. 3 and 4, the overall structure of the plasma display device module 100 is described. The plasma display device of the above embodiment includes a plasma display panel including two substrates 11 and 13 and a panel behind the panel. And a circuit board 60 mounted to the chassis base 30 and the chassis base rear surface and having a driving circuit installed thereon.

On the front substrate 11, sustain electrodes having a straight line shape horizontally parallel to each other are formed, and on the rear substrate 13, address electrodes having a straight line shape perpendicular to each other are formed. The partition wall is positioned in parallel with the address electrode, and a phosphor layer is disposed above the address electrode.

A chassis is installed behind the rear substrate 13. The chassis is provided with a plate-shaped chassis base 30 and a reinforcing material 137 to prevent bending or deformation of the chassis. The chassis base 30 is fixed to the rear surface of the rear substrate 13 by a double-sided tape 21 or the like. The thermal conductive medium 20 is interposed between the chassis base 30 and the rear substrate 13 together with the double-sided tape 21.

A plurality of circuit boards 60, a power supply, and the like are installed behind the chassis base. The circuit board 60 is provided with integrated circuit chips and other electrical and electronic element devices necessary for driving the panel. The circuit board 60 may be coupled to the chassis base 30 through a boss or the like.

Although the plasma display device can be a stand type, it is suitable for wall mounting, so that a wall-mounted boss can be mounted in the chassis so that the load is not concentrated when hanging on the wall.

A plurality of lead electrodes are formed around the plasma display panel attached to the front of the chassis. The lead electrode is formed outside the sealing part along the periphery of the panel to connect a plurality of electrodes such as an address electrode and a sustain electrode formed over the two substrate surfaces of the panel with the driving circuit.

Therefore, in order to transfer the electrical signal of the driving circuit to each of the drawing electrodes, a signal transmitting means for connecting the drawing electrode and the driving circuit is required. In this embodiment, the TCP 50 is used.

The signal transmission means will be described in more detail. The lead electrodes are proportional to the number of address electrodes and sustain electrodes, and the number of address electrodes and sustain electrodes increases as the number of pixels of the panel constituting the display device increases. If individual lead wires are used to connect a plurality of lead electrodes and a plurality of terminals of a driving circuit which signals the lead electrodes, the number of lead wires will be so large that the apparatus will be covered with lead wires and the connection work will be very complicated.

In order to solve this problem, in a flat panel display having a large number of pixels, a signal line that bundles and connects one electrode and one driving circuit terminal into one unit as a means of connecting the electrodes to control the pixels and many terminals of the driving circuit. Are being used.

In the past, the driving chips of the driver are often mounted on the driving circuit board, but recently, the driving chips are directly attached to the board of the panel forming the screen, or some driving chips are commonly used in combination with signal lines. The driving chip and the signal line are used in combination, such as a tape carrier package (TCP) or a chip on film (COF). They are a kind of package with a signal processing chip on its own, and its terminal line is connected to one terminal of both ends connected to them to connect the terminals of both sides.

The protective plates 140, 240, 340, 440 are coupled to the end of the chassis base 30 or to the reinforcement 137 around the end via a screw-like fastening means.

The signal processing driving chip 51 of the TCP 50 emits a lot of heat in accordance with the operation. Therefore, the portion of the driving chip 51 of the TCP is formed so that the upper and lower surfaces are in thermal contact with the reinforcing material 137 or the protection plate of the chassis, respectively, to easily dissipate heat. In order to help the heat dissipation of the driving chip portion, a solid plate-shaped heat conductive medium (not shown) is interposed between the driving chip 51 portion, the reinforcing material 137, the driving chip 51 portion, and the protection plates 140, 240, 340, and 440. Grease treatment takes place.

According to the present invention, it is possible to improve the cooling efficiency of the cooling of the integrated circuit chip installed in the signal line of TCP, COF, etc. connecting the electrodes of the panel and the driving circuit in the plasma display device by changing the configuration of the existing protection plate.

Therefore, according to the present invention, it is possible to alleviate the problem of deterioration of the image quality and the life of the driving chip due to an operation error of the integrated circuit chip installed in the signal line in the plasma display device.

Claims (6)

A protective plate for a plasma display device, which is coupled to a chassis of a plasma display device and fixes a signal line connecting a panel and a circuit unit to the chassis. A protective plate for a plasma display device, characterized in that at least a portion of the protective plate installed laterally relative to the screen is separated laterally. The method of claim 1, And the separated portion is a lower portion of a rear portion extending rearward of the chassis or a portion extending downward from an upper side thereof. The method of claim 1, And said separated portion comprises a plurality of portions in contact with each of said signal lines in accordance with the number of said signal lines used. The method of claim 1, The separated part is separated by a slit or a groove formed in the longitudinal direction, the protective plate for a plasma display device, characterized in that formed as a whole. The method of claim 1, A protective plate for a plasma display device, characterized in that the cross section cut perpendicular to the longitudinal direction is an angled or 1-shaped cross section. A plasma display panel including an electrode, a partition, a sealing material, and a discharge gas between two substrates, A circuit unit installed to drive the electrode, A signal line connecting the panel and the circuit unit, A plasma display device comprising a chassis coupled to the panel and the circuit portion to serve as a support between the panel and the circuit portion. And a protection plate for the plasma display device to fix the signal line between the chassis and the protection plate, when the protection plate is horizontally installed based on a screen.

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