KR100802333B1 - Plasma display apparatus - Google Patents

Abstract

A plasma display apparatus is provided to reduce a manufacturing cost by preventing electric short through the diode of a short protect unit without a conventional switch. A plasma display apparatus includes a plasma display panel having electrodes, a setup/bias voltage supply unit(230), a setdown pulse supply unit(220), a scan pulse supply unit(240), and a short protect unit(255). The setup/bias voltage supply unit supplies a setup pulse during a setup interval of a reset period and a fourth voltage for forming a scan bias voltage during an address period. The setdown pulse supply unit supplies a setdown pulse, which decreases gradually from a first voltage to a third voltage during a setdown interval of the reset period. The scan pulse supply unit supplies the third voltage for forming a scan bias voltage and a scan pulse during an address period. The short protect unit protects electric short with a voltage source for supplying a voltage higher than the third voltage. The setup/bias voltage supply unit includes a switch for maintaining a turn on state during the reset and address periods.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

1 shows a general plasma display device.

2 shows a plasma display device according to a first embodiment of the present invention.

3 is a switching timing diagram for driving a plasma display device according to a first embodiment of the present invention.

4 shows a plasma display device according to a second embodiment of the present invention.

5 is a switching timing diagram for driving a plasma display device according to a second embodiment of the present invention.

The present invention relates to a plasma display device.

In general, a plasma display apparatus includes a plasma display panel for displaying an image and a driving unit for driving the plasma display panel. The plasma display panel consists of a front substrate and a rear substrate of soda-lime glass. A partition wall is formed between the front substrate and the rear substrate to partition the discharge cells. The inert gas injected inside the discharge cells causes the discharge by the high frequency voltage. Vacuum ultraviolet rays (Vacuum Ultraviolet rays) are generated due to the discharge, and the image is realized by emitting a fluorescent substance formed between the partition walls by the vacuum ultraviolet rays.

1 shows a general plasma display device. As shown in FIG. 1, a general plasma display apparatus generates a setup pulse in a setup period of a reset period through operations of switches Q3, Q5, Q6, Q7, and Q15. The scan electrode Y is supplied.

A typical plasma display apparatus supplies the setdown pulse to the scan electrode Y by the operation of the switch Q10 and the switch Q15 during the setdown period of the reset period.

A typical plasma display apparatus applies a scan bias voltage and a scan pulse to the scan electrode Y through the operations of the switch 8, the switch Q9, the switch Q11, the switch Q14, and the switch Q15 during the address period. Supply.

A typical plasma display device is a scan electrode (Y) through the operation of the switch (1), switch (2), switch (3), switch (4), switch (6), switch (7) and switch (15) during the sustain period. Supply a sustain pulse.

The switch Q7 is for separating the voltage (-Vy) and the sustain circuit 10 sustain circuit at the node n2 by the turn-on of the switch Q10 and the switch Q11 in the set down period and the address period. Accordingly, since the withstand voltage of the switch Q7 must be large, an expensive switch must be adopted, and the manufacturing cost of the plasma display device increases.

In addition, in order for the sustainer 10 to supply the sustain pulse to the scan electrode Y, the number of switches existing between the sustainer 10 and the scan electrode Y must be small. However, since the switch Q7 is present at the scan electrode Y in the sustainer 10, there is a problem in that voltage drop and waveform distortion occur when the sustain pulse is supplied.

The present invention is to solve the above problems and to provide a plasma display device that can reduce the manufacturing cost and reduce the voltage drop or waveform distortion when the sustain pulse is supplied.

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 embodiment of the present invention, a plasma display apparatus includes a plasma display panel including an electrode, a set down pulse supply unit supplying a set down pulse gradually decreasing from a first voltage to a third voltage in a set down period of a reset period, and an address. A scan pulse supply unit supplying a scan bias voltage and a third voltage for forming a scan pulse and a short circuit prevention unit for preventing a short circuit with a voltage source supplying a voltage higher than the third voltage when the third voltage is supplied. It includes a sustain pulse supply.

The voltage at a level higher than the third voltage may be a voltage at ground level.

The sustain pulse supply unit may include a first inductor for supplying energy to the electrode and a second inductor for recovering energy from the electrode.

The inductance of the first inductor may be less than the inductance of the second inductor.

The short circuit prevention unit may include a diode including an anode terminal receiving a third voltage and a cathode terminal receiving a voltage having a level higher than that of the third voltage.

The short circuit protection unit may include a switch to turn off when the third voltage is supplied.

According to another aspect of the present invention, a plasma display apparatus includes a plasma display panel including an electrode, supplying a setup pulse in a setup period of a reset period, and supplying a fourth voltage for forming a scan bias voltage in an address period. A setup / bias voltage supply, a set-down pulse supply for supplying a set-down pulse that gradually descends from the first voltage to the third voltage in the set-down period of the reset period, and a method for forming scan bias voltage and scan pulse in the address period. And a sustain pulse supply including a scan pulse supply for supplying three voltages and a short circuit protection for preventing a short circuit with a voltage source supplying a voltage higher than the third voltage when the third voltage is supplied.

The setup / bias voltage supply may include a switch that remains turned on for a reset period and an address period.

The voltage at a level higher than the third voltage may be a voltage at ground level.

The sustain pulse supply unit may include a first inductor for supplying energy to the electrode and a second inductor for recovering energy from the electrode.

The inductance of the first inductor may be less than the inductance of the second inductor.

The short circuit prevention unit may include a diode including an anode terminal receiving a third voltage and a cathode terminal receiving a voltage having a level higher than that of the third voltage.

The short circuit protection unit may include a switch to turn off when the third voltage is 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.

2 shows a plasma display device according to a first embodiment of the present invention. As shown in FIG. 2, the plasma display apparatus according to an exemplary embodiment of the present invention includes a setup pulse supply unit 210, a set down pulse supply unit 220, a bias voltage supply unit 230, a scan pulse supply unit 240, and a sustain pulse. And a supply unit 250 and a scan driver 260.

The setup pulse supply unit 210 gradually increases from the first voltage Vs to the sum (Vs + Vst) of the first voltage Vs and the second voltage Vst in the setup period of the reset period. To supply.

The set down pulse supply 220 supplies a set down pulse that gradually decreases from the first voltage Vs to the third voltage −Vy in the set down period of the reset period.

The bias voltage supplier 230 supplies a fourth voltage Vsc for forming a scan bias voltage in the address period.

The scan pulse supply unit 240 supplies a scan bias voltage and a third voltage (-Vy) for forming the scan pulse in the address period.

The sustain pulse supply unit 250 supplies the first voltage Vs for forming the set-up pulse supplied in the set-up period, and from the fifth voltage GND of the ground level to the first voltage Vs in the sustain period. Supply a rising sustain pulse. In this case, the sustain pulse supply unit 250 may include a source voltage source for supplying a fifth voltage GND at ground level when the third voltage −Vy is supplied by the set down pulse supply unit 220 and the scan pulse supply unit 240. Short circuit protection unit 255 for preventing a short circuit.

The scan driver 260 may include a setup pulse supply 210, a set down pulse supply 220, a bias voltage supply 230, a scan pulse supply 240, and a sustain pulse supply 250 in a reset period, an address period, and a sustain period. ) Is supplied to the scan electrode (Y) of the plasma display panel 100.

Next, the operation of the plasma display device according to the first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a switching timing diagram for driving a plasma display device according to a first embodiment of the present invention.

The switch Q3 of the sustain pulse supply unit 250, the switch Q5 of the setup pulse supply unit 210, and the switch Q15 of the scan driver 260 turn on in the setup period of the reset period. Accordingly, the first voltage Vs is supplied to the scan electrode Y, and the voltage of the node n1 of the capacitor C2 charged with the second voltage Vst is equal to the first voltage Vs and the second voltage ( Sum of Vst) (Vs + Vst). Since the switch Q5 is turned on in the active region, the setup pulse gradually rising from the first voltage Vs to the sum (Vs + Vst) of the first voltage Vs and the second voltage Vst is scanned. It is supplied to the electrode Y. The channel width of the setup pulse is adjusted by the variable resistor VR1.

The switch Q10 of the set down pulse supply unit 220 and the switch Q15 of the scan driver 260 are turned on. Since the switch Q10 operates in the active region, a setdown pulse that falls from the first voltage Vs to the third voltage −Vy is supplied to the scan electrode Y. The channel width of the setdown pulse is adjusted by the variable resistor VR2 connected to the gate terminal of the switch Q10.

At this time, the short-circuit prevention unit 255 prevents the current from flowing into the ground due to the third voltage (-Vy) to become a short-circuit state. That is, even if the switch Q4 and the switch Q6 are turned off, the current may flow through the body diodes BD1 and BD2 of the switch Q4 and the switch Q6, so The diode Dsd blocks the current flowing due to the third voltage -Vy. The anode terminal of the diode Dsd is connected to one end of the switch Q4 and the cathode terminal is connected to a source voltage source supplying a fifth voltage GND of the ground level.

Since the short circuit is prevented through the diode Dsd of the short circuit prevention unit 255, the plasma display device according to the first embodiment of the present invention can perform a normal operation without the switch Q7 of FIG. 1. Accordingly, since the plasma display apparatus according to the first embodiment of the present invention performs normal operation without the switch Q7 of FIG. 1, the manufacturing cost can be reduced, and the voltage drop or waveform distortion can be reduced when the sustain pulse is supplied.

In the address period, the switch Q8 of the bias voltage supply unit 230, the switch Q11 of the scan pulse supply unit 240, and the switch Q14 of the scan driver 260 turn on. Accordingly, since the third voltage (-Vy) is supplied, the voltage of the node n2 of the capacitor C3 charged with the fourth voltage Vsc is the sum of the third voltage (-Vy) and the fourth voltage Vsc (-Vy). + Vsc). Accordingly, the scan bias voltage is equal to the sum of the third voltage (-Vy) and the fourth voltage Vsc (Vsc-Vy). Although the switch Q11 of the scan pulse supply unit 240 is turned on and current flows to the body diodes BD1 and BD2 due to the third voltage (-Vy), the current is generated due to the diode Dsd of the short circuit protection unit 255. Is blocked.

The diode Dsd of the short circuit prevention unit 255 may be replaced by a switch. That is, since the short circuit prevention unit 255 prevents a short circuit due to the third voltage (−Vy), the short circuit protection unit 255 may be replaced by a switch that turns off when the switches Q10 and Q11 are turned on.

In the address period, the switch Q11 of the scan pulse supply unit 240 and the switch Q15 of the scan driver 260 are turned on. Accordingly, the third voltage -Vy is supplied to the scan electrode Y, and a scan pulse for selecting the discharge cell to cause the sustain discharge is supplied to the scan electrode Y. The third voltage (−Vy) is the lowest voltage of the scan pulse.

When the supply of the scan pulse is completed, the scan bias voltage is supplied again. Since the supply of the scan bias voltage has been described in detail above, it is omitted.

In the sustain period, the switch Q1, the switch Q6 of the sustain pulse supply unit 250, and the switch Q15 of the scan driver 260 turn on. Accordingly, the energy stored in the capacitor C1 is supplied to the scan electrode Y through the first inductor L1, the switch Q1, the diode D1, the switch Q6, and the switch Q15. Since the first inductor L1 forms a resonance, the voltage of the scan electrode Y rises to the first voltage Vs.

Next, the switch Q3 of the sustain pulse supply unit 250 turns on, and the switch Q6 and the switch Q15 of the scan driver 260 maintain the turned-on state. Accordingly, the scan electrode Y is maintained at the first voltage Vs.

Next, the switch Q2 of the sustain pulse supply unit 250 is turned on, and the switch Q6 and the switch Q15 of the scan driver 260 are kept turned on. Accordingly, energy is supplied from the scan electrode Y to the capacitor C1 through the switch Q15, the switch Q6, the diode D2, the switch Q2, the second inductor L2, and the switch Q1. do. Since the second inductor L2 forms a resonance, the voltage of the scan electrode Y drops to the fifth voltage GND of the ground level.

Next, the switch Q4 of the sustain pulse supply unit 250 is turned on, and the switch Q6 and the switch Q15 of the scan driver 260 are kept turned on. Accordingly, the scan electrode Y is maintained at the fifth voltage GND of the ground level.

The inductance of the first inductor L1 may be smaller than the inductance of the second inductor L2. This is because the sustain discharge becomes stronger as the time taken for the voltage of the scan electrode Y to rise to the first voltage Vs is shorter.

4 shows a plasma display device according to a second embodiment of the present invention. As shown in FIG. 4, a setup / bias voltage supply unit 410, a set down pulse supply unit 220, a scan pulse supply unit 240, a sustain pulse supply unit 250, and a scan driver 260 are included.

The setup / bias voltage supply unit 410 gradually rises from the first voltage Vs to the sum Vs + Vsc of the first voltage Vs and the fourth voltage Vsc in the setup period of the reset period. A pulse is supplied, and a fourth voltage Vsc is provided to form a scan bias voltage in the address period. That is, in the first embodiment of the present invention, the setup pulse supply unit 210 and the bias voltage supply unit 230 are separated, but in the second embodiment of the present invention, the setup / bias voltage supply unit 410 is the setup pulse and the fourth pulse. Supply voltage Vsc. To this end, the switch Q80 of the setup / bias voltage supply 410 operates in the active and saturation regions. That is, when the switch Q80 is operated in the active region, the scan electrode gradually increases from the first voltage Vs to the sum Vs + Vsc of the first voltage Vs and the fourth voltage Vsc. Is supplied to (Y) and the fourth voltage Vsc is supplied when the switch Q80 operates in the saturation region. Since the setup / bias voltage supply unit 410 supplies the setup pulse and the fourth voltage Vsc, the manufacturing cost of the plasma display apparatus is reduced.

A more detailed description of the operation of the setup / bias voltage supply 410 will be made later with reference to FIG. 5.

The switch Q10 of the set down pulse supply unit 220 and the switch Q15 of the scan driver 260 are turned on. Since the switch Q10 operates in the active region, a setdown pulse that falls from the first voltage Vs to the third voltage −Vy is supplied to the scan electrode Y. The channel width of the setdown pulse is adjusted by the variable resistor VR2 connected to the gate terminal of the switch Q10.

The scan pulse supply unit 240 supplies a scan bias voltage and a third voltage (-Vy) for forming the scan pulse in the address period.

The sustain pulse supply unit 250 supplies the first voltage Vs for forming the set-up pulse supplied in the set up period, and the sustain voltage rising from the fifth voltage GND to the first voltage Vs in the sustain period. Supply the pulse. At this time, the sustain pulse supply unit 250 may include a short circuit prevention unit for preventing a short circuit from the fifth voltage GND when the third voltage (−Vy) is supplied by the set down pulse supply unit 220 and the scan pulse supply unit 240. 255).

The scan driver 260 is generated by the setup / bias voltage supply unit 410, the set down pulse supply unit 220, the scan pulse supply unit 240, and the sustain pulse supply unit 250 in the reset period, the address period, and the sustain period. The driving pulse is supplied to the scan electrode Y of the plasma display panel 100.

Next, the operation of the plasma display device according to the second embodiment of the present invention will be described in detail with reference to the accompanying drawings.

5 is a switching timing diagram for driving a plasma display device according to a second embodiment of the present invention.

The switch Q3 of the sustain pulse supply 250, the switch Q80 of the setup / bias voltage supply 410, and the switch Q14 of the scan driver 260 turn on in the setup period of the reset period. Accordingly, the first voltage Vs is supplied to the scan electrode Y, and the voltage of the node n2 of the capacitor C3 charged with the fourth voltage Vsc is equal to the first voltage Vs and the fourth voltage ( It is the sum (Vs + Vsc) of Vsc). Since the switch Q80 is turned on in the active region, the setup pulse gradually rising from the first voltage Vs to the sum Vs + Vsc of the first voltage Vs and the fourth voltage Vsc is scanned. It is supplied to the electrode Y. The channel width of the setup pulse is adjusted by the variable resistor VR3.

The switch Q10 of the set down pulse supply unit 220 and the switch Q15 of the scan driver 260 are turned on. In addition, the switch Q80 of the setup / bias voltage supply unit 410 is turned on, and the switch Q14 of the scan driver 260 is turned off. Since the switch Q10 operates in the active region, a setdown pulse that falls from the first voltage Vs to the third voltage −Vy is supplied to the scan electrode Y through the switch Q15. The channel width of the setdown pulse is adjusted by the variable resistor VR2 connected to the gate terminal of the switch Q10. In addition, since the switch Q80 of the setup / bias voltage supply unit 410 remains turned on, the switch Q80 operates in the saturation region. However, since the switch Q14 is turned off, the fourth voltage Vsc is not supplied to the scan electrode Y.

At this time, the short-circuit prevention unit 255 prevents the current from flowing into the ground due to the third voltage (-Vy) to become a short-circuit state. That is, since the current may flow through the body diode BD2 of the switch Q4 even when the switch Q4 is turned off, the diode Dsd of the short circuit prevention unit 255 flows due to the third voltage (-Vy). To block. The anode terminal of the diode Dsd is connected to one end of the switch Q4 and the cathode terminal is connected to a source voltage source supplying a fifth voltage GND of the ground level.

Since the short circuit is prevented through the diode Dsd of the short circuit prevention unit 255, the plasma display device according to the second embodiment of the present invention can perform normal operation without the switch Q6 and the switch Q7 of FIG. 1. have. Therefore, since the plasma display apparatus according to the second embodiment of the present invention performs normal operation without the switch Q6 and the switch Q7 of FIG. 1, the manufacturing cost can be reduced, and the voltage drop or waveform distortion can be reduced when the sustain pulse is supplied. .

In the address period, the switch Q80 of the setup / bias voltage supply unit 410 remains turned on, and the switch Q11 of the scan pulse supply unit 240 and the switch Q14 of the scan driver 260 turn on. Accordingly, since the third voltage -Vy is supplied, the voltage of the node n2 of the capacitor C3 charged with the fourth voltage Vsc is equal to the sum of the third voltage -Vy and the fourth voltage Vsc ( -Vy + Vsc, and the sum of the third voltage (-Vy) and the fourth voltage Vsc (Vsc-Vy) is generated through the switch Q80 operating in the saturation region according to the maintenance of the turn-on state. Y) is supplied. Although the switch Q11 of the scan pulse supply unit 240 is turned on and current flows to the body diode BD2 due to the third voltage (-Vy), the current is blocked due to the diode Dsd of the short circuit protection unit 255. .

The diode Dsd of the short circuit prevention unit 255 may be replaced by a switch. That is, since the short circuit prevention unit 255 prevents a short circuit due to the third voltage (−Vy), the short circuit protection unit 255 may be replaced by a switch that turns off when the switches Q10 and Q11 are turned on.

In the address period, the switch Q11 of the scan pulse supply unit 240 and the switch Q15 of the scan driver 260 are turned on. The switch Q80 of the setup / bias voltage supply 410 remains turned on, and the switch Q14 turns off. Accordingly, the third voltage -Vy is supplied to the scan electrode Y, and a scan pulse for selecting the discharge cell to cause the sustain discharge is supplied to the scan electrode Y. In addition, the switch Q80 continues to operate in the saturation region. The third voltage (−Vy) is the lowest voltage of the scan pulse.

When the supply of the scan pulse is completed, the scan bias voltage is supplied again. Since the supply of the scan bias voltage has been described in detail above, it is omitted.

In the sustain period, the switch Q1 of the sustain pulse supply unit 250 and the switch Q15 of the scan driver 260 turn on, and the switch Q80 turns off. Accordingly, the energy stored in the capacitor C1 is supplied to the scan electrode Y through the first inductor L1, the switch Q1, the diode D1, and the switch Q15. Since the first inductor L1 forms a resonance, the voltage of the scan electrode Y rises to the first voltage Vs.

Next, the switch Q3 of the sustain pulse supply unit 250 is turned on, and the switch Q15 of the scan driver 260 is kept turned on. Accordingly, the scan electrode Y is maintained at the first voltage Vs.

Next, the switch Q2 of the sustain pulse supply unit 250 is turned on, and the switch Q15 of the scan driver 260 is kept turned on. Accordingly, energy is supplied from the scan electrode Y to the capacitor C1 through the switch Q15, the diode D2, the switch Q2, the second inductor L2, and the switch Q1. Since the second inductor L2 forms a resonance, the voltage of the scan electrode Y drops to the fifth voltage GND of the ground level.

Next, the switch Q4 of the sustain pulse supply unit 250 is turned on, and the switch Q15 of the scan driver 260 is kept turned on. Accordingly, the scan electrode Y is maintained at the fifth voltage GND at the ground level.

The inductance of the first inductor L1 may be smaller than the inductance of the second inductor L2. This is because the sustain discharge becomes stronger as the time taken for the voltage of the scan electrode Y to rise to the first voltage Vs is shorter.

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.

The plasma display device of the present invention can reduce manufacturing cost and reduce voltage drop or waveform distortion when a sustain pulse is supplied.

Claims (13)

delete delete delete delete delete delete A plasma display panel including an electrode; A setup / bias voltage supply unit for supplying a setup pulse in the setup period of the reset period and supplying a fourth voltage for forming the scan bias voltage in the address period; A set down pulse supply unit supplying a set down pulse that gradually descends from the first voltage to the third voltage in the set down period of the reset period; A scan pulse supply unit configured to supply a scan bias voltage and the third voltage to form a scan pulse in an address period; And A sustain pulse supply unit including a short circuit prevention unit for preventing a short circuit with a voltage source supplying a voltage higher than the third voltage when the third voltage is supplied Including; And the setup / bias voltage supply unit comprises a switch for maintaining a turn-on state during the reset period and the address period. delete The method of claim 7, wherein And a voltage at a level higher than the third voltage is a voltage at ground level. The method of claim 7, wherein And the sustain pulse supply unit includes a first inductor for supplying energy to the electrode and a second inductor for recovering the energy from the electrode. The method of claim 10, The inductance of the first inductor is smaller than the inductance of the second inductor. The method of claim 7, wherein The short circuit prevention unit includes a diode including an anode terminal receiving the third voltage and a cathode terminal receiving a voltage having a level higher than the third voltage. The method of claim 7, wherein And the short circuit prevention unit includes a switch to turn off when the third voltage is supplied.

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