KR20100121960A - Plasma display panel device - Google Patents

Abstract

PURPOSE: A plasma display apparatus is provided to diffuse emitted heat generated during a switching operation to a thermal pad and a frame by mounting a switching element on the rear side of a printed circuit board. CONSTITUTION: A frame(410) supports a plasma display panel. A driving circuit is installed on the rear surface of the frame. The driving circuit drives the plasma display panel. A switching element(SW) is mounted on the rear surface of the printed circuit board. A thermal pad(420) is mounted on the rear surface of the frame. The switching element is in contact with the thermal pad.

Description

Plasma display panel device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a plasma display device in which heat generation of a switching device is easily reduced among a plurality of devices for driving a plasma display panel.

In general, a plasma display apparatus includes a plasma display panel in which a partition wall formed between an upper substrate and a lower substrate forms one discharge cell, and each discharge cell includes neon, helium, or a mixture of neon and helium. A main discharge gas such as (Ne + He) and an inert gas containing a small amount of xenon are filled. When discharged by a high frequency voltage, the inert gas generates vacuum ultraviolet rays and emits phosphors formed between the partition walls to realize an image. Such a plasma display panel has a spotlight as a next generation display device because a thin and light configuration is possible.

Here, the plasma display panel is driven by a printed circuit board on which a driving circuit composed of a plurality of elements is mounted.

In this case, in the plasma display apparatus, a discharge occurs in the plasma display panel according to a switching operation of the switching elements, thereby realizing an image.

Recently, a study for reducing the generation of heat generated by the switching operation of the switching device among the plurality of devices is in progress.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display device in which heat generation of a switching element is easily reduced among a plurality of elements for driving a plasma display panel.

A plasma display device according to the present invention includes a frame supporting a plasma display panel and a printed circuit board mounted on a rear surface of the frame and mounted with a plurality of elements included in a driving circuit for driving the plasma display panel. Among the plurality of devices, the switching device is mounted on the rear surface of the printed circuit board.

Plasma display device of the present invention, by mounting the switching element of the plurality of elements on the back of the printed circuit board, it is possible to reduce the heat generation by spreading the heat generated by the switching operation of the switching element to the thermal pad and frame, The manufacturing cost is reduced by removing the heat sink attached to the switching element.

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

1 is a perspective view illustrating a structure of a plasma display panel according to a first embodiment of the present invention.

Referring to FIG. 1, the plasma display panel includes a scan electrode 11, a sustain electrode 12, a sustain electrode pair formed on the upper substrate 10, and an address electrode 22 formed on the lower substrate 20. It includes.

The sustain electrode pairs 11 and 12 generally include transparent electrodes 11a and 12a and bus electrodes 11b and 12b formed of indium tin oxide (ITO), and the bus electrodes 11b and 12b. ) May be formed of a metal such as silver (Ag), chromium (Cr) or a stack of chromium / copper / chromium (Cr / Cu / Cr) or a stack of chromium / aluminum / chromium (Cr / Al / Cr). The bus electrodes 11b and 12b are formed on the transparent electrodes 11a and 12a to serve to reduce voltage drop caused by the transparent electrodes 11a and 12a having high resistance.

Meanwhile, according to the first embodiment of the present invention, the sustain electrode pairs 11 and 12 have not only a structure in which the transparent electrodes 11a 12a and the bus electrodes 11b and 12b are stacked, but also without the transparent electrodes 11a and 12a. Only the bus electrodes 11b and 12b may be constituted. This structure does not use the transparent electrodes (11a, 12a), there is an advantage that can lower the cost of manufacturing the panel. The bus electrodes 11b and 12b used in this structure may be various materials such as photosensitive materials in addition to the materials listed above.

Light between the scan electrodes 11 and the sustain electrodes 12 between the transparent electrodes 11a and 12a and the bus electrodes 11b and 11c to absorb external light generated outside the upper substrate 10 to reduce reflection. A black matrix (BM, 15) is arranged that functions to block and to improve the purity and contrast of the upper substrate 10.

The black matrix 15 according to the first embodiment of the present invention is formed on the upper substrate 10. The first black matrix 15 and the transparent electrodes 11a and 12a are formed at positions overlapping the partition wall 21. ) And second black matrices 11c and 12c formed between the bus electrodes 11b and 12b. Here, the first black matrix 15 and the second black matrices 11c and 12c, also referred to as black layers or black electrode layers, may be simultaneously formed and physically connected in the formation process, and may not be simultaneously formed and thus not physically connected. .

In addition, when physically connected and formed, the first black matrix 15 and the second black matrix 11c and 12c may be formed of the same material, but may be formed of different materials when they are physically separated.

The upper dielectric layer 13 and the passivation layer 14 are stacked on the upper substrate 10 having the scan electrode 11 and the sustain electrode 12 side by side. Charged particles generated by the discharge are accumulated in the upper dielectric layer 13, and the protective electrode pairs 11 and 12 may be protected. The protective film 14 protects the upper dielectric layer 13 from sputtering of charged particles generated during gas discharge, and increases emission efficiency of secondary electrons.

In addition, magnesium oxide (MgO) may be generally used for the protective film 14, and Si-MgO to which silicon (Si) is added may be used.

Here, the content of silicon (Si) added to the protective film 14 may be 60PPM to 200PPM based on the weight percent.

On the other hand, the address electrode 22 is formed in the direction crossing the scan electrode 11 and the sustain electrode 12. In addition, the lower dielectric layer 23 and the partition wall 21 are formed on the lower substrate 20 on which the address electrode 22 is formed.

In addition, the phosphor layer 23 is formed on the surfaces of the lower dielectric layer 24 and the partition wall 21. The partition wall 21 has a vertical partition wall 21a and a horizontal partition wall 21b formed in a closed shape, and physically distinguishes discharge cells, and prevents ultraviolet rays and visible light generated by the discharge from leaking into adjacent discharge cells.

In the first embodiment of the present invention, not only the structure of the partition wall 21 illustrated in FIG. 1, but also the structure of the partition wall 21 having various shapes may be possible. For example, a channel in which a channel usable as an exhaust passage is formed in at least one of the differential partition structure, the vertical partition 21a, or the horizontal partition 21b having different heights of the vertical partition 21a and the horizontal partition 21b. A grooved partition structure having a groove formed in at least one of the type partition wall structure, the vertical partition wall 21a, or the horizontal partition wall 21b may be possible.

Here, in the case of the differential partition wall structure, the height of the horizontal partition wall 21b is more preferable, and in the case of the channel partition wall structure or the groove partition wall structure, it is preferable that a channel is formed or the groove is formed in the horizontal partition wall 21b. something to do.

Meanwhile, in the first embodiment of the present invention, although each of the R, G, and B discharge cells is shown and described as being arranged on the same line, it may be arranged in other shapes. For example, a Delta type arrangement in which R, G, and B discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the discharge cell may be not only rectangular, but also various polygonal shapes such as a pentagon and a hexagon.

In addition, the phosphor layer 23 emits light by ultraviolet rays generated during gas discharge to generate visible light of any one of red (R), green (G), and blue (B). Here, an inert mixed gas such as He + Xe, Ne + Xe and He + Ne + Xe for discharging is injected into the discharge space provided between the upper / lower substrates 10 and 20 and the partition wall 21.

2 is a perspective view schematically showing a structure of a plasma display device according to a first embodiment of the present invention.

Referring to FIG. 2, the plasma display apparatus may include a plasma display panel 100, a frame 110, a filter 120, a back cover 130, and a bezel 140.

The frame 110 is installed on the rear surface of the plasma display panel 100 to emit heat generated by the plasma display panel 100.

In addition, the frame 110 is provided with a printed circuit board (hereinafter referred to as "PCB") mounted with a drive unit including a plurality of elements (not shown) to drive the plasma display panel 100 on the back side. The PCB is fixed to the frame 110.

That is, the PCB is connected to a plurality of driving integrated circuits (Driving Integrated Circuits (hereinafter referred to as "driver ICs")) for supplying a driving signal to the plasma display panel 100, the PCB and the plasma display panel 100 May be connected by a connecting member, ie, a flexible printed circuit (hereinafter, referred to as “FPC”).

 The filter 120 is installed on the front of the plasma display panel 100 to shield electromagnetic interference (hereinafter referred to as EMI) and to prevent reflection of external light.

The back cover 130 surrounds the rear surface of the plasma display panel 100, and the bezel 140 assembled with the back cover 130 protrudes to the front of the device to surround a portion of the edge of the filter 120. 120).

In the present exemplary embodiment, the plasma display apparatus includes the filter 120, but the filter 120 may not be formed.

That is, an electromagnetic interference pattern may be formed on the plasma display panel 100 to act as a filter 120 to shield electromagnetic interference.

3 is a block diagram illustrating a driving unit for driving a plasma display panel according to a first embodiment of the present invention.

Referring to FIG. 3, the plasma display apparatus is installed on a rear surface of a plasma display panel (not shown) to support the plasma display panel and to absorb and release heat generated from the rear surface of the frame 230 and the frame 230. And a printed circuit board (PCB) installed in the plasma display panel to supply a driving voltage to the plasma display panel.

The plasma display panel includes a plurality of scan electrodes (not shown), a sustain electrode (not shown), and an address electrode (not shown).

An address driver 250 for supplying driving voltages to the plurality of address electrodes, a scan driver 260 for supplying driving voltages to the plurality of scan electrodes, and a driving voltage for the plurality of sustain electrodes on the printed circuit board PCB. The drive driver 270 that controls the sustain driver 270, the address driver 250 and the scan driver 260, and the sustain driver 270 and the address driver 250, the scan driver 260 and the sustain driver 270. 270 and a power supply unit (PSU) 290 for supplying power to the control driver 280 is disposed.

The address driver 250 supplies a driving voltage to the plurality of address electrodes to select only the discharge cells that are discharged from among the plurality of discharge cells formed in the plasma display panel.

The address driver 50 may be installed on any one or both of the upper side and the lower side of the plasma display panel according to a single scan method or a dual scan method.

In the address driver 250, a data IC (not shown) is installed to control currents applied to the plurality of address electrodes, and in the data IC, switching is generated to control an applied current so that a large amount of heat may be generated. have. Therefore, a heat sink (not shown) may be installed in the address driver 250 to eliminate heat generated in the control process.

The scan driver 260 may include a scan sustain board 262 connected to the driving controller 280, and a scan driver board 264 connecting the scan sustain board 262 and the plasma display panel.

The scan driver board 264 may be divided into two parts, an upper side and a lower side. Unlike the scan driver board 264, the scan driver board 264 may be installed as one or more than one.

The scan driver board 264 is provided with a scan IC 265 for supplying a driving voltage to the plurality of scan electrodes, and the scan IC 265 continuously applies reset, scan and sustain signals to the plurality of scan electrodes. Can be.

The sustain driver 270 supplies a driving voltage to the plurality of sustain electrodes.

The control driver 280 performs a predetermined signal processing on the input image signal using the signal processing information stored in the memory, converts the data into data to be supplied to the address electrodes, and arranges the converted data according to a scanning order. have. In addition, the driving controller 280 supplies a timing control signal to the address driver 250, the scan driver 260, and the sustain driver 270, thereby providing the address driver 250, the scan driver 260, and the sustain. The driving signal supply timing of the driver 270 may be controlled.

4 is a circuit diagram illustrating a scan driver supplying a driving signal to a scan electrode of a plasma display device according to a first embodiment of the present invention.

Referring to FIG. 4, the scan driver includes an energy recovery unit 350, a sustain driver 360, a reset driver 370, and a scan IC 380.

The sustain driver 360 includes a sustain voltage power supply Vsus for supplying a high potential sustain voltage Vsus during the sustain period, and a sustain-up switch Sus_up turned on to apply the sustain voltage Vsus to the scan electrode 10. And a sus-down switch Su_dn which is turned on so that the voltage applied to the scan electrode Y falls to its round voltage. That is, in the sustain driver 360, the sus-up switch Su_up is connected to the sustain voltage power supply Vsus, and the sus-down switch Su_dn is connected to the sus-up switch Sus-up and ground.

The energy recovery unit 350 may include a source capacitor Cs for recovering and storing energy supplied to the scan electrode Y, and an energy supply switch that is turned on so that energy stored in the source capacitor Cs is supplied to the scan electrode Y ( ER_up) and an energy recovery switch ER_dn which is turned on to recover energy from the scan electrode Y. The source capacitor Cs forms a resonant circuit together with the inductor L to enable the supply and recovery of energy to the scan electrode Y.

The reset driver 370 is connected to the set-up switch Set_up and the voltage source Vy, which are turned on to supply a gradually rising set-up signal to the scan electrode Y, and then gradually descend to the negative voltage -Vy. The set-down switch Set_dn turned on to supply the setdown signal to the scan electrode Y, and the pass switch Pass_sw forming a current path path with the scan electrode Y.

As shown in FIG. 4, in the set-up switch Set_up, a drain is connected to a sustain voltage power source, a source is connected to a pass switch Pass_sw, and a gate is a variable resistor (not shown). And a setup signal that gradually rises as the resistance value of the variable resistor changes.

The set-down switch Set_dn has a drain connected to the scan IC 380, a source connected to the negative voltage (-Vy), and a variable resistor (not shown) connected to the gate. As the resistance value of the variable resistor (not shown) changes, a set down signal that gradually decreases is generated.

The scan IC 380 is turned on to apply a scan-up switch Q1 connected to a scan voltage power source that is turned on to apply the scan voltage Vsc to the scan electrode Y, and a ground voltage to the scan electrode Y. And a scan-down switch Q2.

Here, the energy recovery unit 350, the sustain driver 360, the reset driver 370, and the scan IC 380 of the scan driver are mounted on a printed circuit board (PCB).

That is, a printed circuit board (PCB) is mounted with a resistor, a capacitor, an inductor and a scan IC of the plurality of devices on the front, and the switching elements, that is, up and down switches are mounted on the back.

FIG. 5 is a plan view illustrating a printed circuit board on which the scan driver shown in FIG. 4 is mounted.

Referring to FIG. 5, the printed circuit board PCB includes an energy supply switch ER_up, an energy recovery switch ER_dn, a sus-up switch Sus-up switch, a sus-down switch Sus_dn, a pass switch Pass_sw, The switching elements including the scan-up switch Q1 and the scan-down switch Q2 and a plurality of elements including the source capacitor Cs and the inductor L are shown.

Here, the switching element is mounted on the front surface of the conventional printed circuit board (PCB), but the switching element is mounted on the rear surface of the printed circuit board (PCB) of the present invention.

In addition, the printed circuit board PCB has a connector sustain voltage Vsus, a scan voltage Vsc, and an output terminal Vout for outputting a driving signal to the scan electrode. It is composed.

In the present exemplary embodiment, a switching element of the plurality of elements is mounted on a rear surface of the printed circuit board PCB, and a source capacitor Cs and an inductor L except the switching element of the plurality of elements are mounted on a front surface of the PCB. .

In the present embodiment, a plurality of elements mounted on a printed circuit board (PCB) is simply shown, but not limited thereto.

FIG. 6 is a cross-sectional view schematically illustrating a structure of a plasma display apparatus in which the printed circuit board illustrated in FIG. 5 is incorporated.

Referring to FIG. 5, the present plasma display apparatus includes a plasma display panel 400, a frame 410 installed on a rear surface of the plasma display panel 400, and a plurality of elements SW, Cs, and L on the rear surface of the frame 410. The printed circuit board includes a printed circuit board (PDB) mounted with a driving circuit (not shown) and a thermal pad 420 stacked between the frame 410 and the printed circuit board (PCB).

That is, the frame 410 supports the plasma display panel 400, emits heat to the outside, and fixes the printed circuit board (PCB).

Here, in the printed circuit board PCB, a source capacitor Cs and an inductor L of the plurality of devices SW, Cs, and L are mounted on a front surface thereof, and a switching element SW is mounted on a rear surface thereof.

The switching element SW mounted on the rear surface of the printed circuit board PCB contacts the thermal pads 420 stacked on the rear surface of the frame 400.

The switching element SW comprises at least one of an IGBT and a FET such as the switches shown in FIG. 5.

Here, the switching device SW generates heat as the number of switching on or off increases. At this time, heat is diffused to the frame 400 contacted through the thermal pad 420 to be discharged to the outside.

That is, in the related art, when the switching element SW is mounted on the front surface of the printed circuit board, heat is emitted to the outside by a heat sink (not shown) and the thermal pad. Mounted on the back side of the thermal pad 420 through the heat to diffuse the heat onto the frame 410, the manufacturing cost is reduced.

The thermal pad 420 is preferably a bonding material including silicon (Si) and silicon, and other materials having high thermal conductivity may be used.

Plasma display device of the present invention is to mount the switching element on the back of the printed circuit board, by spreading the heat generated by the switching element on the frame to discharge to the outside, it is easier to emit heat generated than the conventional heat sink, manufacturing cost This reduces costs and simplifies the manufacturing process.

1 is a perspective view illustrating a structure of a plasma display panel according to a first embodiment of the present invention.

2 is a perspective view schematically illustrating a structure of a plasma display device according to a first embodiment of the present invention.

3 is a configuration diagram illustrating a driving unit for driving a plasma display panel according to a first embodiment of the present invention.

4 is a circuit diagram illustrating a scan driver supplying a driving signal to a scan electrode of a plasma display device according to a first embodiment of the present invention.

FIG. 5 is a plan view illustrating a printed circuit board on which the scan driver shown in FIG. 4 is mounted.

FIG. 6 is a cross-sectional view schematically illustrating a structure of a plasma display apparatus in which the printed circuit board illustrated in FIG. 5 is incorporated.

Claims (5)

A printed circuit board mounted on a frame supporting the plasma display panel and a rear surface of the frame and mounted on a plurality of elements included in a driving circuit for driving the plasma display panel; Among the plurality of devices, the switching device, And a plasma display device mounted on a rear surface of the printed circuit board. The method of claim 1, The rear of the frame is equipped with a thermal pad, The switching device, And a plasma display device in contact with the thermal pad. The method of claim 2, wherein the thermal pad, Plasma display device, characterized in that the bonding material containing silicon (Si) and silicon. The method of claim 1, wherein the switching device, At least one of an IGBT and an FET. The method of claim 1, The remaining elements except for the switching element among the plurality of elements, And a plasma display device mounted on the front surface of the printed circuit board.

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