KR20070045861A - Apparatus for plasma display - Google Patents

Abstract

The present invention relates to a plasma display device.

The plasma display device according to the present invention includes a first sustain voltage source, a second sustain voltage source, a first back voltage unit charging a voltage value of the first sustain voltage source and a voltage value of the second sustain voltage source, a voltage value of the first sustain voltage source, and a first back voltage. After charging the negatively charged voltage value, the second back pressure part and the second back pressure part supplying a back voltage value of four times the voltage value of the first sustain voltage source to the panel capacitor are connected between the second back voltage part and the panel capacitor to make the second back voltage. And a sustain pulse supply control unit configured to supply the back voltage value supplied from the unit to the panel capacitor.

1st back-pressure part, 2nd back-pressure part, sustain voltage source, capacitor

Description

Plasma display device {Apparatus for Plasma Display}

1 is a circuit diagram showing an energy recovery apparatus of a conventional plasma display panel.

FIG. 2 is a timing diagram and waveform diagrams illustrating on / off timings of the switches illustrated in FIG. 1 and output waveforms of panel capacitors.

3 is a circuit diagram illustrating a plasma display device according to an embodiment of the present invention.

4 is a timing diagram illustrating on / off timing of the switches illustrated in FIG. 3.

5 to 6 are circuit diagrams illustrating current paths formed according to on / off timings of the switches illustrated in FIG. 4.

7 is a circuit diagram illustrating a plasma display device according to another embodiment of the present invention.

8 to 11 are circuit diagrams illustrating current paths formed according to on / off timings of switches of the plasma display apparatus of FIG. 7.

(Explanation of symbols for the main parts of the drawing)

30: first sustain voltage source 31: second sustain voltage source

32: second back pressure part 33: first back pressure part

34: sustain pulse supply control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device and a driving method thereof, and more particularly, to a plasma display device capable of reducing manufacturing costs by enabling the use of low capacitance devices.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such a flat panel display includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (hereinafter referred to as "PDP"), and an electroluminescence ( Electro-Luminescence (EL) display. PDP is a display device using a gas discharge has the advantage that it is easy to manufacture a large panel. Currently, most PDPs use a three-electrode AC surface discharge type PDP in which a scan electrode and a sustain electrode are formed on an upper substrate, and an address electrode is formed on a lower substrate.

The three-electrode AC surface discharge type PDP is driven by being divided into a plurality of subfields, and gray scale display is performed by emitting light a number of times proportional to the weight of video data in each subfield period. At this time, the subfield is again divided into an initialization period, an address period, and a sustain period and driven.

Here, the initialization period is a period during which uniform wall charges are formed in the discharge cells, the address period is a period during which selective address discharge is generated according to the logic value of the video data, and the sustain period is in the discharge cell where the address discharge is generated. It is a period in which discharge is maintained.

The high-voltage of several hundred volts or more is required for the address discharge and the sustain discharge of the three-electrode AC surface discharge type PDP driven as described above. Therefore, in the PDP, an energy recovery apparatus is used to minimize the driving power required for the address discharge and the sustain discharge.

1 is a circuit diagram showing a conventional PDP energy recovery device.

Referring to FIG. 1, the energy recovery apparatus of the plasma display panel proposed by 'Weber (USP-5081400)' is installed symmetrically with each other with a panel capacitor Cp interposed therebetween. The panel capacitor Cp equivalently represents the capacitance formed between the scan electrode Y and the sustain electrode Z of the PDP.

The first energy recovery device 10 of the conventional PDP supplies a sustain pulse to the scan electrode (Y). The second energy recovery device 12 supplies a sustain pulse to the sustain electrode Z.

FIG. 2 is a timing diagram and waveform diagrams illustrating on / off timings of the switches illustrated in FIG. 1 and output waveforms of panel capacitors.

Referring to FIG. 2, the voltage of the sustain voltage source Vs is supplied to the scan electrode Y while the second switch SW2 is turned on in the t2 period. The voltage of the sustain voltage source Vs supplied to the scan electrode Y prevents the voltage of the panel capacitor Cp from falling below the sustain voltage source Vs so that sustain discharge occurs normally. Meanwhile, the second energy recovery device 12 alternately operates with the first recovery device 10 to supply a driving voltage to the panel capacitor Cp.

However, voltage stress of each switch is generated by the size of the sustain voltage source, which is an input power source. Therefore, there is a problem that the manufacturing cost is added by using a switch with high breakdown voltage and high capacity.

Therefore, the technical problem to be achieved by the present invention relates to a plasma display device that can reduce the manufacturing cost by enabling the use of low-capacity devices.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

According to an aspect of the present invention, there is provided a plasma display device including a first back voltage for charging voltage values of a first sustain voltage source, a second sustain voltage source, a first sustain voltage source, and a voltage value of a second sustain voltage source. The second back pressure unit and the second back voltage unit and the second voltage supply unit supplying the back voltage value of four times the voltage value of the first sustain voltage source to the panel capacitor after charging the voltage value of the first sustain voltage source and the first back voltage unit. And a sustain pulse supply controller connected between the second back pressure unit and the panel capacitor to control the back capacitor voltage value supplied from the second back pressure unit to the panel capacitor.

In addition, the back pressure voltage value is preferably the sustain voltage value Vs.

Further, the voltage value of the first sustain voltage source is preferably 1/4 times (1 / 4Vs) of the sustain voltage value.

In addition, the second sustain voltage value is preferably -1/4 times (-1 / 4Vs) of the sustain voltage value.

In addition, the first back voltage unit charges the voltage value of the first sustain voltage source and the voltage value of the second sustain voltage source, and the second capacitor supplying the charged voltage value to the second back voltage part, and the voltage value charged in the first back voltage part. And a fourth switch turned on to be supplied to the second back pressure part and a fifth switch connected in parallel with the fourth switch.

The first back voltage unit may include a second diode connected between the common terminal of the fourth switch and the second capacitor and the base voltage source, and a third diode connected between the common terminal of the fifth switch and the second capacitor and the second back voltage unit. It includes more.

In addition, the second back voltage unit charges the voltage value of the first sustain voltage source and the voltage value charged in the first back voltage unit, and supplies the back voltage value to the panel capacitor and the voltage of the first sustain voltage source to the second capacitor. And a third switch that is turned on such that the voltage of the first capacitor is raised to a back voltage value while charging the value.

The second back voltage unit may further include a first diode connected between the first sustain voltage source and the common terminal of the third switch and the first capacitor.

In addition, the sustain pulse supply control unit is connected between the second back pressure unit and the panel capacitor, and is connected between the first switch and the panel capacitor and the base voltage source, which are turned on to supply the back voltage value to the panel capacitor, so that the base voltage is applied to the panel capacitor. And a second switch that is turned on to be supplied.

According to another aspect of the present invention, there is provided a plasma display device including a first sustain voltage source, a second sustain voltage source, a first sustain voltage source, and a first sustain voltage source charged with a voltage value. A second back pressure part which charges the voltage value of the back voltage part, the first sustain voltage source and the voltage value charged in the first back voltage part, and then supplies a back voltage of four times the voltage value of the first sustain voltage source to the panel capacitor; A sustain pulse supply controller and a panel capacitor connected between the second back pressure unit and the panel capacitor to control the back capacitor voltage value supplied from the second back pressure unit to recover the energy of reactive power not contributing to the discharge; It also includes an energy recovery / supply unit for supplying the recovered energy back to the panel capacitor.

The energy recovery / supply unit may further include a source capacitor for storing energy recovered from the panel capacitor, an inductor connected between the source capacitor and the sustain pulse supply control unit, and a sixth switch and a seventh switch connected in parallel between the source capacitor and the inductor. Include.

In addition, the back pressure voltage value is preferably the sustain voltage value Vs.

Further, the voltage value of the first sustain voltage source is preferably 1/4 times (1 / 4Vs) of the sustain voltage value.

In addition, the second sustain voltage value is preferably -1/4 times (-1 / 4Vs) of the sustain voltage value.

In addition, the first back voltage unit charges the voltage value of the first sustain voltage source and the voltage value of the second sustain voltage source, and the second capacitor supplying the charged voltage value to the second back voltage part, and the voltage value charged in the first back voltage part. And a fourth switch turned on to be supplied to the second back pressure part and a fifth switch connected in parallel with the fourth switch.

The first back voltage unit may include a second diode connected between the common terminal of the fourth switch and the second capacitor and the base voltage source, and a third diode connected between the common terminal of the fifth switch and the second capacitor and the second back voltage unit. It includes more.

In addition, the second back voltage unit charges the voltage value of the first sustain voltage source and the voltage value charged in the first back voltage unit, and supplies the back voltage value to the panel capacitor and the voltage of the first sustain voltage source to the second capacitor. And a third switch that is turned on such that the voltage of the first capacitor is raised to a back voltage value while charging the value.

The second back voltage unit may further include a first diode connected between the first sustain voltage source and the common terminal of the third switch and the first capacitor.

In addition, the sustain pulse supply control unit is connected between the second back pressure unit and the panel capacitor, and is connected between the first switch and the panel capacitor and the base voltage source, which are turned on to supply the back voltage value to the panel capacitor, so that the base voltage is applied to the panel capacitor. And a second switch that is turned on to be supplied.

Specific details of other embodiments are included in the detailed description and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. Like reference numerals refer to like elements throughout.

Hereinafter, a plasma display device according to an exemplary embodiment of the present invention will be described with reference to FIGS. 3 to 6.

3 is a circuit diagram illustrating a plasma display device according to an embodiment of the present invention.

As shown in FIG. 3, the plasma display device according to an exemplary embodiment of the present invention includes a first sustain voltage source 30, a second sustain voltage source 31, a first back pressure part 33, and a second back pressure part 32. ), And a sustain pulse supply control unit 34.

The first sustain voltage source 30 is connected to one end of the second back pressure part 32 to charge the first capacitor Cr1 of the second back pressure part 32 to charge the voltage value of the first sustain voltage source 30. The second capacitor Cr2 of the first back pressure unit 33 charges the voltage value of the first sustain voltage source 30 and the first capacitor (so that the voltage value finally supplied to the panel capacitor Cp becomes the sustain voltage value). The voltage of Cr1) is supplied to rise to the back pressure voltage value Vs. Here, it is preferable that the first sustain voltage source 30 has a voltage value that is finally supplied to the panel capacitor Cp is 1 / 4Vs, which is 1/4 times the back voltage value Vs. Here, the panel capacitor Cp equivalently represents the capacitance formed between the scan electrode Y and the sustain electrode Z of the plasma display panel. In the sustain electrode Z of the panel capacitor Cp, a plasma display device having the same configuration as the circuit of the plasma display device provided in the scan electrode Y of the panel capacitor Cp is interposed between the panel capacitor Cp. It is installed so as to be symmetrical.

The second sustain voltage source 31 is connected to one end of the first back pressure part 33 to charge the voltage value of the second sustain voltage source 30 to the second capacitor Cr2 of the first back pressure part 33.

The first back pressure unit 33 charges the voltage value (1 / 4Vs) of the first sustain voltage source 30 and the voltage value (-1 / 4Vs) of the second sustain voltage source 31, and charges the charged voltage value (1). / 2Vs) is supplied to the second back pressure part 32.

The second capacitor Cr2 is connected between the common terminal of the third diode D3 and the fifth switch SW5 and the common terminal of the second diode D2 and the fourth switch SW4 to connect the first sustain voltage source 30. The voltage value (1 / 4Vs) and the voltage value (-1 / 4Vs) of the second sustain voltage source 31 are charged, and the charged voltage value (1 / 2Vs) is supplied to the second back pressure unit 32. .

The fourth switch SW4 is connected between the common terminal of the first capacitor Cr1 and the third switch SW3 and the common terminal of the second capacitor Cr2 and the second diode D2 so that the second capacitor Cr2 The voltage value (1 / 2Vs) charged in the is turned on to be supplied to the second back pressure part 31.

The fifth switch SW5 is connected in parallel with the second capacitor Cr2 between the common terminal of the second capacitor Cr2 and the third diode D3 and the second sustain voltage source 31 to connect the first sustain voltage source ( Turn on so that the voltage value (1 / 4Vs) of 30 and the voltage value (-1 / 4Vs) of the second sustain voltage source 31 are combined to supply the voltage value charged to the second capacitor Cr2 to be 1 / 2Vs. do.

The second diode D2 is connected between the common terminal of the fourth switch SW4 and the second capacitor Cr2 and the base voltage source, and the third diode D3 is connected to the fifth switch SW5 and the second back pressure unit ( 32) to prevent reverse current.

The second back pressure part 32 is connected between the sustain pulse supply control part 34 and the first sustain voltage source 30 to charge the voltage value (1 / 4Vs) of the first sustain voltage source and the first back pressure part 33. After charging the voltage value 1 / 2Vs, the back voltage value Vs four times the voltage value of the first sustain voltage source 30 is supplied to the panel capacitor Cp. Here, the back voltage voltage value is preferably the sustain voltage value Vs finally supplied to the panel capacitor Cp.

The first capacitor Cr1 is connected between the common terminal of the fourth switch SW4 and the third diode D3 and the common terminal of the first switch SW1 and the first diode D1 so that the first sustain voltage source 30 The voltage value (1 / 4Vs) and the voltage value (1 / 2Vs) charged in the first back pressure unit 33 are charged, and the back voltage voltage value (Vs) is supplied to the panel capacitor Cp.

The third switch SW3 is connected between the common terminal of the first sustain voltage source 30 and the first diode D1 and the common terminal of the fourth switch SW4 and the third diode D3 and is connected to the second capacitor Cr2. ), While the voltage value (1 / 4Vs) of the first sustain voltage source is charged, the voltage of the first capacitor Cr1 is turned on to rise to the back voltage voltage value Vs, which is the sustain voltage value to be finally supplied to the panel capacitor.

The first diode D1 is connected between the common terminal of the first capacitor Cr1 and the first switch SW1 and the first sustain voltage source 30 to prevent reverse current.

The sustain pulse supply controller 34 is connected to the second back pressure part 32 and the panel capacitor Cp to control the back voltage value Vs supplied from the second back pressure part 32 to the panel capacitor Cp. do.

The first switch SW1 is connected between the common terminal of the first diode D1 and the first capacitor Cr1 and the panel capacitor Cp so that the back voltage voltage Vs is supplied to the panel capacitor Cp. do.

The second switch SW2 is connected between the panel capacitor Cp and the ground voltage source GND and turned on to supply the ground voltage.

Here, the first to fifth switches SW1 to SW5 control the flow of current while being turned on and off. The switches SW1 to SW5 are used as semiconductor switch elements, for example, semiconductor switch elements such as MOSFETs, IGBTs, SCRs, and BJTs. In addition, the first diode D1, the second diode D2, and the third diode D3 may be removed.

4 is a timing diagram illustrating on / off timings of the switches illustrated in FIG. 3, and FIGS. 5 to 6 are circuit diagrams illustrating current paths formed according to on / off timings of the switches illustrated in FIG. 4.

4 to 6, in the t1 period, the second switch SW2 according to the high second switching control signal, the fourth switching control signal, and the fifth switching control signal supplied from the timing controller (not shown). The fourth switch SW4 and the fifth switch SW5 are turned on. Accordingly, as shown in FIG. 5, a current path (solid line) leading to the panel capacitor Cp, the second switch SW2, and the base voltage source is formed, so that the voltage of the panel capacitor Cp becomes the base voltage during the t1 period. GND). In addition, the current leading to the first sustain voltage source 30, the first diode D1, the first capacitor Cr1, the fourth switch SW4, the second capacitor Cr2, the fifth switch SW4, and the ground voltage source A path (dotted line) is formed. Therefore, the voltage value (-1 / 4Vs) of the second sustain voltage source 31 is charged in the second capacitor Cr2 during the t1 period, and the voltage value (1) charged in the second capacitor Cr2 during the t2 period, which will be described later. / 4Vs) and the voltage value (-1 / 4Vs) of the second sustain voltage source 31 are added, so that 1 / 2Vs, which is 1/2 times the sustain voltage Vs, is added to the second capacitor Cr2 to the first capacitor Cr1. Supplied to the first capacitor Cr1 is charged with a voltage value of 3 / 4Vs, which is 3/4 times the sustain voltage Vs.

In the t2 period, the first switch SW1 and the third switch SW3 are turned on according to the first switching control signal and the third switching control signal in a high state supplied from a timing controller (not shown), and the low ( The second switch SW2, the fourth switch SW4, and the fifth switch SW2 are turned off according to the second switching control signal, the fourth switching control signal, and the fifth switching control signal in the LOW state. Accordingly, as shown in FIG. 6, a current path leading to the first sustain voltage source 30, the third switch SW3, the first capacitor Cr1, the first switch SW1, and the panel capacitor Cp is obtained. The voltage value (3 / 4Vs) of the first capacitor Cr1 formed and charged in the t1 period and the voltage value supplied to the first capacitor Cr1 by the first sustain voltage source 30 by the current path formed in the t2 period ( 1 / 4Vs), and finally, the panel capacitor Cp is supplied with the back voltage voltage value Vs, which is the sustain voltage value Vs. Therefore, the voltage of the panel capacitor Cp maintains the sustain voltage Vs for the period t2. In addition, a current path (dotted line) leading to the first sustain voltage source 30, the third switch SW3, the third diode D3, the second capacitor Cr2, the second diode D2, and the ground voltage source is formed. . Therefore, the voltage value (1 / 4Vs) of the first sustain voltage source 30 is charged in the second capacitor Cr2 during the t2 period.

As described above, the voltage value of the sustain voltage source is not directly supplied to the panel capacitor Cp, but the voltage value of the first sustain voltage source 30 is passed through the first capacitor Cr1 of the second backing part 32. Since the voltage value (Vs) of three times (1 / 4Vs) is supplied, the voltage stress of some elements (SW1, SW3) of the circuit is reduced to 1 / 4Vs, which is 1/4 of the sustain voltage value (Vs), so that Will be available.

Thereafter, the sustain pulse supplied to the panel capacitor Cp is supplied by repeating the operation from the period t1 to t2.

7 to 11, a plasma display device according to another embodiment of the present invention will be described.

7 is a circuit diagram illustrating a plasma display device according to another embodiment of the present invention.

As shown in FIG. 7, the plasma display device according to an exemplary embodiment of the present invention includes a first sustain voltage source 70, a second sustain voltage source 71, a first back pressure part 73, and a second back pressure part 72. ), The sustain pulse supply control unit 74 and the energy recovery / supply unit 75.

The first sustain voltage source 30 is connected to one end of the second back pressure part 32 to charge the first capacitor Cr1 of the second back pressure part 32 to charge the voltage value of the first sustain voltage source 30. The second capacitor Cr2 of the first back pressure unit 33 charges the voltage value of the first sustain voltage source 30 and the first capacitor (so that the voltage value finally supplied to the panel capacitor Cp becomes the sustain voltage value). The voltage of Cr1) is supplied to rise to the back pressure voltage value Vs. Here, it is preferable that the first sustain voltage source 30 has a voltage value that is finally supplied to the panel capacitor Cp is 1 / 4Vs, which is 1/4 times the back voltage value Vs. Here, the panel capacitor Cp equivalently represents the capacitance formed between the scan electrode Y and the sustain electrode Z of the plasma display panel. In the sustain electrode Z of the panel capacitor Cp, a plasma display device having the same configuration as the circuit of the plasma display device provided in the scan electrode Y of the panel capacitor Cp is provided with the panel capacitor Cp interposed therebetween. It is installed to be symmetrical.

The second sustain voltage source 31 is connected to one end of the first back pressure part 33 to charge the voltage value of the second sustain voltage source 30 to the second capacitor Cr2 of the first back pressure part 33.

The first back pressure unit 33 charges the voltage value (1 / 4Vs) of the first sustain voltage source 30 and the voltage value (-1 / 4Vs) of the second sustain voltage source 31, and charges the charged voltage value (1). / 2Vs) is supplied to the second back pressure part 32.

The second capacitor Cr2 is connected between the common terminal of the third diode D3 and the fifth switch SW5 and the common terminal of the second diode D2 and the fourth switch SW4 to connect the first sustain voltage source 30. The voltage value (1 / 4Vs) and the voltage value (-1 / 4Vs) of the second sustain voltage source 31 are charged, and the charged voltage value (1 / 2Vs) is supplied to the second back pressure unit 32. .

The fourth switch SW4 is connected between the common terminal of the first capacitor Cr1 and the third switch SW3 and the common terminal of the second capacitor Cr2 and the second diode D2 so that the second capacitor Cr2 The voltage value (1 / 2Vs) charged in the is turned on to be supplied to the second back pressure part 31.

The fifth switch SW5 is connected in parallel with the second capacitor Cr2 between the common terminal of the second capacitor Cr2 and the third diode D3 and the second sustain voltage source 31 to connect the first sustain voltage source ( The voltage value (1 / 4Vs) of 30 and the voltage value (-1 / 4Vs) of the second sustain voltage source 31 are combined to be turned on so that the voltage value charged to the second capacitor Cr2 becomes 1 / 2Vs. .

The second diode D2 is connected between the common terminal of the fourth switch SW4 and the second capacitor Cr2 and the base voltage source, and the third diode D3 is connected to the fifth switch SW5 and the second back pressure unit ( 32) to prevent reverse current.

The second back pressure part 32 is connected between the sustain pulse supply control part 34 and the first sustain voltage source 30 to charge the voltage value (1 / 4Vs) of the first sustain voltage source and the first back pressure part 33. After charging the voltage value 1 / 2Vs, the back voltage value Vs four times the voltage value of the first sustain voltage source 30 is supplied to the panel capacitor Cp. Here, the back voltage voltage value is preferably the sustain voltage value Vs finally supplied to the panel capacitor Cp.

The first capacitor Cr1 is connected between the common terminal of the fourth switch SW4 and the third diode D3 and the common terminal of the first switch SW1 and the first diode D1 so that the first sustain voltage source 30 The voltage value (1 / 4Vs) and the voltage value (1 / 2Vs) charged in the first back pressure unit 33 are charged, and the back voltage voltage value (Vs) is supplied to the panel capacitor Cp.

The third switch SW3 is connected between the common terminal of the first sustain voltage source 30 and the first diode D1 and the common terminal of the fourth switch SW4 and the third diode D3 and is connected to the second capacitor Cr2. ), While the voltage value (1 / 4Vs) of the first sustain voltage source is charged, the voltage of the first capacitor Cr1 is turned on to rise to the back voltage voltage value Vs, which is the sustain voltage value to be finally supplied to the panel capacitor.

The first diode D1 is connected between the common terminal of the first capacitor Cr1 and the first switch SW1 and the first sustain voltage source 30 to prevent reverse current.

The sustain pulse supply controller 34 is connected to the second back pressure part 32 and the panel capacitor Cp to control the back voltage value Vs supplied from the second back pressure part 32 to the panel capacitor Cp. do.

The first switch SW1 is connected between the common terminal of the first diode D1 and the first capacitor Cr1 and the panel capacitor Cp so that the back voltage voltage Vs is supplied to the panel capacitor Cp. do.

The second switch SW2 is connected between the panel capacitor Cp and the ground voltage source GND and turned on to supply the ground voltage.

The energy recovery / supply unit 75 is connected to the common terminals of the panel capacitor Cp, the first switch SW1, and the second switch SW2, so that the energy of the reactive power that does not contribute to the discharge in the panel capacitor Cp is supplied. In addition to the recovery, the recovered energy is supplied again to the panel capacitor Cp.

The source capacitor Cs is connected to the common terminals of the sixth switch SW6 and the seventh switch SW7 to recover and charge the voltage charged to the panel capacitor Cp during sustain discharge, and to charge the voltage therein. To the panel capacitor Cp.

The inductor L is connected between the source capacitor Cs and the sustain pulse supply control unit 74. The inductor L has a constant inductance value and forms a resonance circuit together with the panel capacitor Cp.

The sixth switch SW6 and the seventh switch SW7 are connected in parallel between the source capacitor Cs and the inductor L so as to recover the voltage when the source capacitor Cs is charged to the panel capacitor Cp. The sixth switch SW6 is turned on and the seventh switch SW7 is turned on when the voltage charged inside the source capacitor Cs is resupplied to the panel capacitor Cp.

The fourth diode D3 is connected between the sixth switch SW6 and the inductor L, and the fifth diode D5 is connected between the seventh switch SW7 and the inductor L to prevent reverse current.

Here, the first to seventh switches SW1 to SW7 control the flow of current while being turned on and off. The switches SW1 to SW7 are used as semiconductor switch elements, for example, semiconductor switch elements such as MOSFETs, IGBTs, SCRs, and BJTs. In addition, the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, and the fifth diode D5 may be removed.

8 to 11 are circuit diagrams illustrating current paths formed according to on / off timings of switches of the plasma display apparatus of FIG. 7.

First, the operation process will be described in detail on the assumption that the panel capacitor Cp is charged with a voltage of 0V and the source capacitor Cs is charged with a 1/2 sustain voltage (1 / 2Vs).

Referring to FIG. 8, the sixth switch SW6 is turned on in response to a sixth switching control signal of HIGH supplied from a timing controller (not shown). Accordingly, as shown in FIG. 8, current paths leading to the source capacitor Cs, the sixth switch SW6, the fourth diode D4, the inductor L, and the panel capacitor Cs are formed to form an inductor ( L) and the panel capacitor Cp generate series resonance. As a result, the voltage of the panel capacitor Cp rises from the base voltage to the sustain voltage value Vs.

Next, referring to FIG. 9, the first switch SW1 and the third switch SW3 according to a first switching control signal and a third switching control signal in a high state supplied from a timing controller (not shown). Is turned on. Accordingly, as shown in FIG. 9, a current path leading to the first sustain voltage source 30, the third switch SW3, the first capacitor Cr1, the first switch SW1, and the panel capacitor Cp is obtained. The first sustain voltage source 30 is formed by the first capacitor voltage by the voltage value (3 / 4Vs) of the first capacitor Cr1 that is formed and charged in the period of FIG. 11 to be described later and the current path formed in the period described in FIG. 9. Combined with the voltage value (1 / 4Vs) supplied to Cr1), the back capacitor voltage value Vs, which is the sustain voltage value Vs, is finally supplied to the panel capacitor Cp. Therefore, the voltage of the panel capacitor Cp maintains the sustain voltage Vs for the period described in FIG. In addition, a current path is formed that leads to the first sustain voltage source 30, the third switch SW3, the third diode D3, the second capacitor Cr2, the second diode D2, and the ground voltage source. For this reason, the voltage value (1 / 4Vs) of the first sustain voltage source 30 is charged in the second capacitor Cr2 during the period described in FIG. 9.

As described above, the voltage value of the sustain voltage source is not directly supplied to the panel capacitor Cp, but the voltage value of the first sustain voltage source 30 is passed through the first capacitor Cr1 of the second backing part 32. Since the voltage value (Vs) of three times (1 / 4Vs) is supplied, the voltage stress of some elements (SW1, SW3) of the circuit is reduced to 1 / 4Vs, which is 1/4 of the sustain voltage value (Vs), so that Will be available.

Next, referring to FIG. 10, the seventh switch SW7 is turned on according to the seventh switching control signal of HIGH supplied from a timing controller (not shown). Accordingly, as shown in FIG. 10, a current path leading to the panel capacitor Cp, the inductor L, the fifth diode D5, the seventh switch SW7, and the source capacitor Cs is formed. (L) and panel capacitor (Cp) generate series resonance. As a result, the voltage of the panel capacitor Cp drops from the sustain voltage Vs to the base voltage.

Next, referring to FIG. 11, the second switch SW2 and the fourth switch according to a high second switching control signal, a fourth switching control signal, and a fifth switching control signal supplied from a timing controller (not shown). The switch SW4 and the fifth switch SW5 are turned on. Accordingly, as shown in FIG. 11, a current path (solid line) leading to the panel capacitor Cp, the second switch SW2, and the base voltage source is formed, so that the voltage of the panel capacitor Cp becomes the base voltage during the t1 period. GND). In addition, the current leading to the first sustain voltage source 30, the first diode D1, the first capacitor Cr1, the fourth switch SW4, the second capacitor Cr2, the fifth switch SW4, and the ground voltage source A pass is formed. For this reason, the voltage value (1 / 4Vs) charged in the second capacitor Cr2 during the period described in FIG. 9 and the voltage value of the second sustain voltage source 31 during the period described in FIG. 4Vs is charged in the second capacitor Cr2, and 1 / 2Vs, which is 1/2 of the sustain voltage Vs, is supplied to the second capacitor Cr2 to the first capacitor Cr1, and sustained to the first capacitor Cr1. The voltage value of 3 / 4Vs, which is 3/4 times the voltage Vs, is charged.

Thereafter, the sustain pulse supplied to the panel capacitor Cp is repeatedly supplied from the period shown in FIG. 8 to the period shown in FIG.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. will be. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

Plasma display device according to an embodiment of the present invention made as described above has the effect of reducing the manufacturing cost by configuring a circuit to use a low capacitance device.

Claims (19)

A first sustain voltage source and a second sustain voltage source; A first back pressure unit configured to charge a voltage value of the first sustain voltage source and a voltage value of the second sustain voltage source; A second back voltage unit which charges the voltage value of the first sustain voltage source and the voltage value charged in the first back voltage unit, and supplies a back voltage of four times the voltage value of the first sustain voltage source to the panel capacitor; And A sustain pulse supply control unit connected between the second back pressure unit and the panel capacitor to control the back voltage value supplied from the second back pressure unit to the panel capacitor; Plasma display device comprising a. The method of claim 1, The back pressure voltage value is a sustain voltage value (Vs). The method of claim 1, And a voltage value of the first sustain voltage source is 1/4 times (1 / 4Vs) of the sustain voltage value. The method of claim 1, And the second sustain voltage value is -1/4 times (-1 / 4Vs) of the sustain voltage value. The method according to claim 1 or 2, The first back pressure unit A second capacitor charging the voltage value of the first sustain voltage source and the voltage value of the second sustain voltage source and supplying the charged voltage value to the second back voltage unit; A fourth switch turned on to supply the voltage value charged in the first back pressure part to the second back pressure part; And A fifth switch in parallel with the second capacitor Plasma display device comprising a. The method of claim 5, The first back pressure unit A second diode connected between the common terminal of the fourth switch and the second capacitor and a ground voltage source; And A third diode connected between the common terminal of the fifth switch and the second capacitor and the second back voltage unit; Plasma display device further comprising. The method according to claim 1 or 2, The second back pressure portion A first capacitor charging a voltage value of the first sustain voltage source and a voltage value charged in the first back voltage unit, and supplying the back voltage value to the panel capacitor; And A third switch that is turned on such that the voltage of the first capacitor is raised to the back voltage value while charging the second capacitor with the voltage value of the first sustain voltage source; Plasma display device comprising a. The method of claim 7, wherein And the second back voltage unit further comprises a first diode connected between the first sustain voltage source, the common terminal of the third switch, and a first capacitor. The method according to claim 1 or 2, The sustain pulse supply control unit A first switch connected between the second back pressure unit and the panel capacitor and turned on to supply the back voltage value to the panel capacitor; Wow A second switch connected between the panel capacitor and a base voltage source and turned on to supply the base voltage to the panel capacitor Plasma display device comprising a. A first sustain voltage source and a second sustain voltage source; A first back pressure unit configured to charge a voltage value of the first sustain voltage source and a voltage value of the second sustain voltage source; A second back voltage unit which charges the voltage value of the first sustain voltage source and the voltage value charged in the first back voltage unit, and supplies a back voltage of four times the voltage value of the first sustain voltage source to the panel capacitor; A sustain pulse supply control unit connected between the second back pressure unit and the panel capacitor to control the back voltage value supplied from the second back pressure unit to the panel capacitor; And An energy recovery / supply unit which recovers energy of reactive power not contributing to the discharge from the panel capacitor and resupply the recovered energy to the panel capacitor. Plasma display device comprising a. The method of claim 10, The energy recovery / supply unit A source capacitor storing energy recovered from the panel capacitor; An inductor connected between the source capacitor and the sustain pulse supply control unit; And A sixth switch and a seventh switch connected in parallel between the source capacitor and the inductor Plasma display device comprising a. The method of claim 10, The back pressure voltage value is a sustain voltage value (Vs). The method of claim 10, And a voltage value of the first sustain voltage source is 1/4 times (1 / 4Vs) of the sustain voltage value. The method of claim 10, And the second sustain voltage value is -1/4 times (-1 / 4Vs) of the sustain voltage value.  The method according to claim 10 or 12,  The first back pressure unit A second capacitor charging the voltage value of the first sustain voltage source and the voltage value of the second sustain voltage source and supplying the charged voltage value to the second back voltage unit; A fourth switch turned on to supply the voltage value charged in the first back pressure part to the second back pressure part; And A fifth switch in parallel with the second capacitor Plasma display device comprising a. The method of claim 15, The first back pressure unit A second diode connected between the common terminal of the fourth switch and the second capacitor and a ground voltage source; And A third diode connected between the common terminal of the fifth switch and the second capacitor and the second back voltage unit; Plasma display device further comprising. The method according to claim 10 or 12, The second back pressure portion A first capacitor charging a voltage value of the first sustain voltage source and a voltage value charged in the first back voltage unit, and supplying the back voltage value to the panel capacitor; And A third switch that is turned on such that the voltage of the first capacitor is raised to the back voltage value while charging the second capacitor with the voltage value of the first sustain voltage source; Plasma display device comprising a. The method of claim 17, And the second back voltage unit further comprises a first diode connected between the first sustain voltage source, the common terminal of the third switch, and a first capacitor. The method according to claim 10 or 12, The sustain pulse supply control unit A first switch connected between the second back pressure unit and the panel capacitor and turned on to supply the back voltage value to the panel capacitor; Wow A second switch connected between the panel capacitor and a base voltage source and turned on to supply the base voltage to the panel capacitor Plasma display device comprising a.

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