KR20080069073A - Plasma display device - Google Patents

Abstract

A plasma display device is provided to effectively drain inner heat to the outside by generating an air flow between a PDP(Plasma Display Panel) and a chassis base. A plasma display device includes a PDP(100), a chassis base(110), a circuit board(120), and a cooling fan(130). The PDP displays an image using a gas discharge. The chassis base is arranged behind the PDP to support the PDP and includes at least one through-hole, which is opened toward the PDP. The circuit board is arranged behind the chassis base and drives the PDP. The cooling fan is installed on the chassis base and injects air between the chassis base and the PDP. An ejection path, which is formed on the chassis base, ejects air between the PDP and the chassis base. The cooling fan is directly attached to the through-hole.

Description

Plasma display device

1 is an exploded perspective view of a plasma display device according to an embodiment of the present invention.

FIG. 2 is a partial side cross-sectional view seen from the cross section of II-II of the plasma display device of FIG. 1.

3 is a modified example in which a part of the plasma display device of FIG. 2 is modified.

4 is an exploded perspective view of a plasma display device according to another embodiment of the present invention.

FIG. 5 is a partial side cross-sectional view seen from the cross section of VV of the plasma display device of FIG. 4.

* Explanation of symbols for main parts of the drawings

100: plasma display panel 111: through hole

101: front panel 112: discharge passage

102: rear panel 120, 120a: circuit board

103: electromagnetic wave blocking film 121, 122: heating element

104: adhesive tape 121a, 122a, 123a, 125a: insulator

106: front cabinet 123, 125: integrated chip

107: rear cabinet 123b, 125b: thermal conductor

108, 108a, 108b: inlet 130, 230: cooling fan

109: outlet 231, 232: air supply pipe

109a: ventilation fan 233: branch

110: chassis base

The present invention relates to a plasma display device, and more particularly, to a plasma display device capable of smoothly dissipating internal heat to the outside by generating an air flow between the plasma display panel and the chassis base.

BACKGROUND OF THE INVENTION A plasma display device is an apparatus that displays an image by using a gas discharge phenomenon, and is excellent in various display capabilities such as display capacity, brightness, contrast, afterimage, viewing angle, and the like, and has been spotlighted as a device that can replace a CRT. The plasma display device is configured to generate a discharge by applying a predetermined voltage to electrodes installed in a sealed space filled with gas, and excite a phosphor layer formed in a predetermined pattern by ultraviolet rays generated during discharge to implement an image.

The plasma display panel adopts a discharge mechanism that emits light by applying a high voltage to the discharge cells as light emitting means, so that a large amount of heat is generated between the discharge cells that selectively discharge when the plasma display panel is driven.

When the heat generated from the plasma display panel is not conducted smoothly, various problems occur. For example, the heat is locally concentrated to degrade the quality of the image, or the plasma display panel is heated to a temperature higher than an appropriate level. Problems such as shortening the lifetime of the phosphors occur. As a result, the commodity value of the plasma display panel is lowered.

In the chassis base, a circuit board having a driving circuit is installed, which generates a lot of heat. Since the potential applied to the electrode of the plasma display panel must be controlled in response to an image signal input from the outside, the circuit chip of the driving board controls the large amount of signal for a moment and applies the potential to the electrode. The circuit chip generates a lot of heat because it requires a lot of switching operation in a short time.

Conventionally, since the electromagnetic wave blocking film and the tempered glass are attached to the front of the plasma display panel, the panel surface is not directly exposed to the user. However, recently, a technique of directly attaching a barrier film to a panel without using tempered glass has been used, so that the surface of the panel is exposed to the user. When a user touches an exposed panel surface, the heat generated from the panel may be felt, which may be mistaken for a malfunction or failure of the device. Therefore, cooling and heat emission of the plasma display device become more important.

Conventionally, heat dissipation by natural convection is used to dissipate heat generated during driving of a plasma display device. Heat dissipation by natural convection attaches the chassis base made of excellent thermal conductivity to the plasma display panel, and installs a heat radiating medium or heat conducting medium between the panel and the chassis base to conduct heat generated from the panel through the heat radiating medium and the chassis base. Technology to allow it to be discharged out of the device.

The heat dissipation technology by natural convection forms a ventilation hole in a cabinet and naturally distributes internal and external air of the plasma display device through the ventilation hole to discharge heat generated from the plasma display panel and the driving board to the outside. However, there is a tendency that airflow does not flow smoothly because various elements such as reinforcement are attached to the chassis base and act as a resistance to airflow. Therefore, the heat radiation technology by natural convection has a problem that the heat radiation is not made sufficiently.

In addition, a heat sink is attached to circuit chips that generate a lot of heat in the circuit board. The heat sink functions to dissipate heat from the circuit chip by using air flow by natural convection. For efficient heat dissipation, the heat sink must have a large area in contact with the air. Therefore, the size of the heat sink is larger than that of the circuit chip and the circuit board, and the heat sink protrudes severely. Devices such as capacitors and field effect transistors (FETs) also generate a lot of heat, which are also large and protrude backwards from the circuit board. As a result, the overall thickness of the circuit board is thick, which causes a limitation in designing a thin plasma display device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display device capable of smoothly dissipating internal heat to the outside by generating an air flow between the plasma display panel and the chassis base.

Another object of the present invention is to generate a flow of air at various locations of the plasma display apparatus using one cooling fan to smoothly discharge the heat inside.

It is another object of the present invention to generate air flow between the plasma display panel and the chassis base without significantly affecting the arrangement of other components installed in the chassis base.

Another object of the present invention is to improve the structure of the elements protruding from the circuit board and the heat sink to efficiently cool the heat generated from the circuit board while reducing the overall thickness of the plasma display apparatus.

The present invention provides a plasma display device that generates a smooth air flow in the space between the plasma display panel and the chassis base by using a cooling fan mounted to the chassis base.

The plasma display device according to the present invention includes at least a plasma display panel in which an image is embodied by gas discharge, and spaced apart from the rear of the plasma display panel at predetermined intervals to support the plasma display panel and to open toward the plasma display panel. A chassis base having one through hole, a circuit board disposed at the rear of the chassis base to drive the plasma display panel, and installed on the chassis base and connected to the through hole to provide air between the chassis base and the plasma display panel. It includes a cooling fan for injecting.

In the present invention, a discharge passage for discharging the air flow formed between the plasma display panel and the chassis base may be formed above the chassis base.

In the present invention, the cooling fan may be directly attached to the through hole.

In the present invention, the plasma display apparatus may further include an air supply pipe connected to one end of the plasma display device and connected to the cooling fan of the other end of the plasma display device. A plurality of through holes may be formed in the chassis base, one end of each of the plurality of air supply pipes is connected to the through hole, and the other end of the air supply pipes is connected to the cooling fan, and the cooling fan is connected to the plurality of air supply pipes. Can supply air The air supply lines may be made of a flexible material.

In the present invention, the circuit board is spaced apart from the chassis base by a predetermined distance and disposed behind the chassis base, and the heating elements may be installed on the circuit board so as to thermally contact the chassis base by protruding from the circuit board toward the chassis base. The heating elements may contact the chassis base via the insulator.

In the present invention, the circuit board is spaced apart from the chassis base at a distance from the chassis base, the integrated chip is installed on the circuit board so as to protrude from the circuit board toward the chassis base, the integrated chip is a chassis base by a thermal conductor And may be thermally connected.

In the present invention, the circuit board is spaced apart from the chassis base at a predetermined distance from the rear of the chassis base, the integrated chip is installed on the circuit board so as to protrude toward the rear of the circuit board, the thermal conductor attached to the integrated chip to the chassis base It can be extended to thermally connect the integrated chip with the chassis base.

In the present invention, the plasma display apparatus may further include a cabinet in which the chassis base, the circuit board, and the plasma display panel are wrapped and supported from the outside, and an inlet and an outlet are formed.

Hereinafter, the configuration and operation of the plasma display device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view of a plasma display device according to an embodiment of the present invention, and FIG. 2 is a partial side cross-sectional view seen from a cross section of II-II of the plasma display device of FIG. 1.

The plasma display device according to the embodiment illustrated in FIG. 2 includes a plasma display panel 100, a chassis base 110, a circuit board 120, and a cooling fan 130.

The plasma display panel 100 is driven by an image signal input from the outside and implements an image. At this time, the image is implemented as follows. That is, in the plurality of discharge cells disposed inside the plasma display panel 100, a discharge is selectively generated in response to an external image signal, and ultraviolet rays generated by the discharge excite the phosphor layer disposed in the discharge cell. Visible light is emitted from the phosphor layer to realize an image.

Here, the discharge refers to a process in which the charged particles in the discharge cell collide with the discharge gas by the potential applied to the discharge electrode, and the collided discharge gas is excited to generate ultraviolet rays. During discharge, a significant amount of energy is converted into thermal energy as charged particles and the discharge gas collide, and only a part of the energy excites the particles of the discharge gas. Therefore, heat is generated in the discharge cells in which discharge occurs.

Since discharge of the discharge cells is selectively generated in response to external image signals, heat may be generated locally only in discharge cells that are repeatedly discharged. If heat is locally accumulated in some of the discharge cells while the discharge is continuously occurring, its function is attenuated by the heat of the phosphor layer disposed in the discharge cell. As a result, a residual image may be generated in an image implemented by the plasma display panel, thereby degrading the image quality of the plasma display panel. In addition, if such a state persists, the phosphor layer may be deteriorated by heat, thereby shortening the lifespan of the plasma display panel.

In the plasma display device according to the present exemplary embodiment, due to the action of the cooling fan 130 installed on the chassis base 110 and injecting air between the plasma display panel 100 and the chassis base 110, the plasma display panel Heat generated at 100 can be effectively released.

The plasma display panel 100 (hereinafter, referred to as a 'panel') forms a plasma display module together with the chassis base 110 and the circuit board 120, and the plasma display module is accommodated in the cabinets 106 and 107. Supported. The cabinet includes a front cabinet 106 in which a window is formed to expose the display area of the panel 100 to the front side, and a rear side that surrounds and supports the plasma display panel 100, the chassis base 110, and the circuit board 120 from the rear side. It consists of a cabinet 107. The rear cabinet 107 is formed with an inlet 108 which is a passage through which external air flows inward and an outlet 109 which is a passage through which internal air is discharged outward.

The panel 100 includes a front panel 101 and a rear panel 102, and an electromagnetic wave blocking film 103 is attached to the front of the panel 100. The electromagnetic wave blocking film 103 may be directly attached to the front surface of the panel 100 as described above, or may be coupled to the front cabinet 106 by being combined with tempered glass.

The chassis base 110 is disposed at the rear of the panel 100 at predetermined intervals. Since the panel 100 and the chassis base 110 are attached by the adhesive tape 104, the chassis base 110 and the panel 100 may be disposed in parallel with each other and a predetermined gap may be maintained therebetween. The chassis base 110 is formed of a material such as aluminum having good thermal conductivity, and supports the panel 100 so that the panel 100 is not deformed by heat or damaged by external impact, and is transferred from the panel 100. It functions to release heat.

A circuit board 120 driving the panel 100 is disposed behind the chassis base 110. The circuit board 120 includes a signal controller to control an image signal applied to the panel 100 to implement an image, and a power module to supply power to the signal controller. The signal controller includes integrated circuit chips that control a potential applied to an electrode of the panel 100 to control the driving of the panel 100. In the circuit board 120, a lot of heat is generated due to the frequent switching operation of the integrated circuit chips for driving the panel 100. In addition, the circuit board 120 is provided with a device that emits a lot of heat, such as a capacitor (capacitor) or a field effector transistor (FET).

The plasma display device according to the present exemplary embodiment functions to effectively cool the heat generated from the circuit board 120. Since the chassis base 110 is maintained in a state in which the cooling fan 130 is smoothly cooled by the air injected into the panel 100 and the chassis base 110, the heat generated from the circuit board 120 according to the present embodiment. The circuit board 120 is thermally connected to the chassis base 110 to discharge the gas.

As a method in which the circuit board 120 is thermally connected to the chassis base 110, as shown in FIG. 2, the heating elements 121 and 122 and the integrated chip 123 may be connected to the circuit board 120. A method installed on the circuit board 120 to protrude toward the chassis base 110 may be used. The heating elements 121 and 122 refer to elements that generate heat, such as a capacitor or a field effect transistor (FET). The heating elements 121 and 122 may be in direct contact with the chassis base 110 or may be in thermal contact with the chassis base 110 via the insulators 121a and 122a to prevent current from flowing as shown. .

In general, since the integrated chip 123 is thinner than the heating elements 121 and 122, the integrated chip 123 may be thermally connected to the chassis base 110 by a heat conductor 123b made of a material capable of smoothly transferring heat. have. The thermal conductor 123b may be attached to the chassis base 110 via an insulator 123a to prevent current from flowing between the integrated chip 123 and the chassis base 110.

In general, the heating elements have a large size, and the heat sink attached to the integrated chip is also large in order to maximize the heat dissipation area. Therefore, in the related art, the overall height of the circuit board 120 is increased to act as a factor of increasing the overall thickness of the plasma display device. However, in the present embodiment, as the heating elements 121 and 122 and the integrated chip 123 are installed to protrude toward the chassis base 110 as described above, the circuit board 120 is installed on the chassis base 110. The overall height of) can be greatly reduced.

Another way in which the circuit board is thermally connected to the chassis base 110, is installed on the circuit board 120a so that the integrated chip 125 protrudes toward the rear of the circuit board 120a and attached to the integrated chip 125. The thermal conductor 125b is extended to the chassis base 110 to thermally connect the integrated chip 125 and the chassis base 110. At this time, in order to prevent current from flowing between the integrated chip 125 and the chassis base 110, the thermal conductor 125b may be attached to the chassis base 110 by an insulator 125a.

By such a configuration, since the integrated chip of the circuit board and the heating elements are thermally connected to the chassis base 110, heat generated from the circuit board may be efficiently cooled through the chassis base 110.

The cooling fan 130 is installed in the chassis base 110. The cooling fan 130 is connected to the through hole 111 of the chassis base 110 to inject external air as cooling air between the chassis base 110 and the panel 100. The through hole 111 is formed through the chassis base 110 to open toward the panel 100, and serves as a passage through which air is injected. In this embodiment, the cooling fan 130 is directly attached to the through hole 111 of the chassis base 110.

The flow of air generated by the air injected by the cooling fan 130 into the space between the chassis base 110 and the panel 100 serves to cool the panel 100 and the chassis base 110. Move to the upper side of the (100). The air moved upward is discharged upward through the remaining space except for the portion where the panel 100 and the chassis base 110 are attached to the adhesive tape 104, and the plasma is discharged by the outlet 109 of the rear cabinet 107. It may be discharged to the outside of the display device.

Since the adhesive tape 104 may obstruct the flow of air discharged to the outside, the discharge passage 112 for discharging the air flow formed between the panel 100 and the chassis base 110 is provided in the chassis base 110. Can be formed. Therefore, the air moved upward while cooling the panel 100 and the chassis base 110 may pass through the discharge passage 112 and then be discharged to the outside through the discharge port 109 of the rear cabinet 107.

The operation of the plasma display device having the above-described configuration will be described below.

When the cooling fan 130 installed in the through hole 111 of the chassis base 110 is driven, external air is introduced into the plasma display device through the inlet 108 of the rear cabinet 107. The introduced air passes through the through hole 111 by the cooling fan 130 and is injected into the space between the chassis base 110 and the panel 100.

Therefore, the flow of air flowing upward between the panel 100 and the chassis base 110 occurs. Air cools the panel 100 and the chassis base 110 and moves upward. Since the chassis base 110 is smoothly cooled by contact with air and has a low temperature, heat generated from the heating elements 121 and 122 and the integrated chip 123 of the circuit board 120 is transferred to the chassis base 110. It can be delivered easily. Through this, heat generated from the circuit board 120 may be smoothly cooled.

Air moved upward through the space between the chassis base 110 and the panel 100 is discharged to the rear of the chassis base 110 through an exhaust passage 112 formed at an upper side of the chassis base 110. It is discharged to the outside through the outlet 109 of the rear cabinet 107.

3 is a modified example in which a part of the plasma display device of FIG. 2 is modified.

In the plasma display device according to the modification shown in FIG. 3, the ventilation fan 109a is installed in the rear cabinet 107, which is a modified portion from the embodiment of FIG. 2. Since the air moved upwards through the space between the panel 100 and the chassis base 110 is heated, it will maintain a high temperature. However, if the heated air is circulated again inside the cabinets 106 and 107 without being discharged to the outside, the air inside the plasma display apparatus may be heated.

In the present modification, the ventilation fan 109a installed at the outlet of the rear cabinet 107 smoothly discharges the air discharged from the discharge passage 112 of the chassis base 110 to the outside of the cabinets 106 and 107. As the air that cools the plasma display device is discharged to the outside, external cool air smoothly flows through the inlet 108 of the rear cabinet 107, thereby efficiently cooling the plasma display device.

4 is an exploded perspective view of a plasma display device according to another embodiment of the present invention, and FIG. 5 is a partial side cross-sectional view seen from the cross section of V-V of the plasma display device of FIG. 4.

4 and 5 also include a plasma display panel 100, a chassis base 110, a circuit board 120, and a cooling fan 230. In the present embodiment, the cooling fan 230 is not directly attached to the through hole 111 of the chassis base 110, but is connected to the through hole 111 through air supply pipes 231 and 232. Has a difference.

One end of the air supply pipes 231 and 232 is connected to the through hole 111, and the other end is connected to the cooling fan 230. Therefore, the air supply pipes 231 and 232 guide the air flowing into the cooling fan 230 between the chassis base 110 and the panel 100 through the through hole 111.

The air supply pipes 231 and 232 may be made of a flexible material. Since various types of circuit boards are disposed on the rear surface of the chassis base 110, space utilization is not easy, and thus it may be difficult to secure a location where the cooling fan 230 is installed. Since the air supply pipes 231 and 232 of the present embodiment are made of a flexible material and can be freely deformed, the cooling fan 230 is cooled to avoid interference with other components such as a circuit board no matter where the cooling fan 230 is installed. The fan 230 and the through hole 111 may be easily connected.

In a small plasma display device, it is sufficient to provide one cooling fan 230 and an air supply pipe. However, in recent years, since the plasma display apparatus has been enlarged, it is necessary to install several cooling fans 230 in order to obtain a sufficient cooling effect over a large area of the entire plasma display panel. However, as the number of cooling fans increases, the factors of noise and vibration also increase, so it is not easy to install a plurality of cooling fans.

In this embodiment, one cooling fan 230 is connected to several air supply pipes 231 and 232 so that one cooling fan 230 can inject air at various positions of the plasma display panel 100. A plurality of through holes 111 are formed in the chassis base 110, and one end of the air supply pipes 231 and 232 is connected to each through hole 111. Since the other ends of the air supply pipes 231 and 232 are connected to each other, the cooling fan 230 may supply air to the plurality of air supply pipes 231 and 232. In the present embodiment, the other ends of the air supply pipes 231 and 232 are connected to one in the branch portion 233, and the cooling fan 230 is mounted to the branch portion 233 to the plurality of air supply pipes 231 and 232. Air is supplied.

In the plasma display apparatus illustrated in FIGS. 4 and 5, the cooling fan 230 is installed above the chassis base 110. Both ends of the air supply pipes 231 and 232 are connected to the branch portion 233 and the through hole 111 formed under the chassis base 110. Therefore, when the cooling fan 230 is driven, external air of the plasma display device is introduced through the inlets 108a and 108b, and the cooling fan 230 and the air supply pipes 231 and 232 and the through hole 111 are driven. It may be supplied between the chassis base 110 and the panel 100.

In this embodiment, the air flow may be generated at various positions between the plasma display panel 100 and the chassis base 110 by using one cooling fan 230. Thus, even in a plasma display device having a large size, an efficient cooling effect can be obtained, and the number of cooling fans 230 required can be reduced, thereby reducing costs and minimizing noise and vibration.

Although the present invention has been described with reference to the above-described embodiments, these are 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 appended claims.

As described above, the plasma display apparatus of the present invention generates an air flow between the plasma display panel and the chassis base, so that the internal heat is smoothly discharged to the outside.

In addition, even if a small number of cooling fans are used, air flow can be generated at various positions of the plasma display device, so that the heat of the plasma display device can be smoothly discharged, and noise and vibration caused by the installation of the cooling fan can be prevented. Occurrence can be minimized.

In addition, a flexible air supply tube allows the freedom to design the location of the cooling fan, which creates air flow between the plasma display panel and the chassis base without significantly affecting the placement of other components installed in the chassis base. You can.

In addition, the structures protruding from the circuit board and the heat sink may be improved to efficiently cool heat generated in the circuit board while reducing the overall thickness of the plasma display apparatus.

Claims (11)

A plasma display panel in which an image is realized by gas discharge; A chassis base disposed at a rear of the plasma display panel at a predetermined interval to support the plasma display panel and having at least one through hole formed to open toward the plasma display panel; A circuit board disposed behind the chassis base to drive the plasma display panel; And And a cooling fan installed on the chassis base and connected to the through hole to inject air between the chassis base and the plasma display panel. The method of claim 1, And a discharge passage for discharging air flow formed between the plasma display panel and the chassis base above the chassis base. The method according to claim 1 or 2, And the cooling fan is directly attached to the through hole. The method according to claim 1 or 2, The plasma display apparatus further comprises an air supply pipe, one end of which is connected to the through hole and the other end of which is connected to the cooling fan, disposed in the chassis base. The method of claim 4, wherein A plurality of through holes are formed in the chassis base, one end of each of the plurality of air supply pipes is connected to the through hole, and the other end of the air supply pipes is connected to each other and connected to the cooling fan, and the cooling fan is connected to the cooling fan. A plasma display device for supplying air to a plurality of air supply pipes. The method of claim 5, wherein The air supply pipe is a plasma display device made of a flexible material. The method according to claim 1 or 2, The circuit board is spaced apart from the chassis base by a predetermined distance and disposed behind the chassis base, the heating element is installed on the circuit board so as to thermally contact the chassis base by protruding toward the chassis base from the circuit board Display device. The method of claim 7, wherein And the heating elements contact the chassis base via an insulator. The method according to claim 1 or 2, The circuit board is spaced apart from the chassis base by a predetermined distance from the rear of the chassis base, an integrated chip is installed on the circuit board so as to protrude from the circuit board toward the chassis base, the integrated chip is formed by the thermal conductor Plasma display device thermally connected to the chassis base. The method according to claim 1 or 2, The circuit board is spaced apart from the chassis base by a predetermined distance and disposed behind the chassis base, the integrated chip is installed on the circuit board so as to protrude toward the rear of the circuit board, the heat conductor attached to the integrated chip is the chassis And a base extending to a base to thermally connect the integrated chip and the chassis base. The method according to claim 1 or 2, And a cabinet in which the chassis base, the circuit board, and the plasma display panel are wrapped and supported from the outside, and an inlet and an outlet are formed.

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