Plasma display apparatus and driving method thereof
View Patent ↗There is provided a plasma display apparatus and a driving method of a plasma display panel. The plasma display apparatus comprises a plasma display panel comprising a first electrode and a second electrode, and an electrode driver alternatively applying a sustain pulse of a first polarity to the first electrode and the second electrode and applying a pulse of a second polarity opposite to a first polarity after a magnitude of a voltage of a sustain pulse of a first polarity is maximized. Therefore, it is possible to increase discharge efficiency without rising a driving voltage or increasing an electrode space by increasing an amount of space discharge.
1. A plasma display apparatus, comprising:
a plasma display panel comprising a first electrode and a second electrode;
a first energy recovery unit supplying the first energy to the plasma display panel through the first electrode with resonance or recovering the first energy from the plasma display panel through the first electrode with resonance;
a first positive voltage supply unit supplying a first positive voltage to the first electrode after the first energy is supplied;
a first negative voltage supply unit supplying a first negative voltage to the first electrode while the first energy is recovered or after the first energy is recovered;
a second energy recovery unit supplying a second energy to the plasma display panel through the second electrode with resonance or recovering the second energy from the plasma display panel through the second electrode with resonance;
a second positive voltage supply unit supplying a second positive voltage to the second electrode after the second energy is supplied; and
a second negative voltage supply unit supplying the second negative voltage to the second electrode while the second energy is recovered or after the second energy is recovered,
wherein the first negative voltage supply unit comprises a first negative voltage supply switch having a first gate terminal, the first gate terminal being connected to a first variable resistor and operating in an active area, and
wherein the second negative voltage supply unit comprises a second negative voltage supply switch having a second gate terminal, the second gate terminal being connected to a second variable resistor and operating in an active area.
2. The plasma display apparatus of claim 1 , wherein the first positive voltage is a positive sustain voltage for sustaining discharge.
3. The plasma display apparatus of claim 1 , wherein the second positive voltage is a positive sustain voltage for sustaining discharge.
4. The plasma display apparatus of claim 1 , wherein the first energy corresponds to 0.5 times of the first positive voltage.
5. The plasma display apparatus of claim 1 , wherein the second energy corresponds to 0.5 times of the second positive voltage.
6. The plasma display apparatus of claim 1 , wherein the first energy recovery unit comprises a first energy recovery capacitor storing the first energy, a first supply switch forming a supply path of the first energy stored in the first energy recovery capacitor, a first recovery diode forming a recovery path of the first energy which is recovered through the first electrode, and a first inductor forming resonance when the first energy is supplied or recovered; and
the second energy recovery unit comprises a second energy recovery capacitor storing the second energy, a second supply switch forming a supply path of the second energy stored in the second energy recovery capacitor, a second recovery diode forming a recovery path of the second energy recovered through the second electrode, and a second inductor forming resonance when the second energy is supplied or recovered.
7. The plasma display apparatus of claim 6 , wherein the first recovery diode comprises a cathode terminal commonly connected to one terminal of the first supply switch and one terminal of the first energy recovery capacitor, and an anode terminal commonly connected to the other terminal of the first supply switch and one terminal of the first inductor, and the second recovery diode comprises a cathode terminal commonly connected to one terminal of the second supply switch and one terminal of the second energy recovery capacitor, and an anode terminal commonly connected to the other terminal of the second supply switch and one terminal of the second inductor.
8. The plasma display apparatus of claim 7 , wherein the first recovery diode is a body diode of the first supply switch.
9. The plasma display apparatus of claim 7 , wherein the second recovery diode is a body diode of the second supply switch.
10. The plasma display apparatus of claim 1 , wherein the first energy recovery unit comprises a first energy recovery capacitor storing the first energy, a first supply switch forming a supply path of the first energy stored in the first energy recovery capacitor, a first recovery switch forming a recovery path of the first energy recovered to the first energy recovery capacitor, and a first inductor; and the second energy recovery unit comprises a second energy recovery capacitor storing the second energy, a second supply switch forming a supply path of the second energy stored in the second energy recovery capacitor, a second recovery switch forming a recovery path of the second energy recovered to the second energy recovery capacitor, and a second inductor supplying or recovering the second energy with resonance.
11. The plasma display apparatus of claim 1 , wherein the first negative voltage supply unit supplies the first negative voltage having a ramp waveform and the second negative voltage supply unit supplies the second negative voltage having a ramp waveform.
12. The plasma display apparatus of claim 1 , wherein the first negative voltage supply unit supplies the first negative voltage having a square waveform and the second negative voltage supply unit supplies the second negative voltage having a square waveform.
13. The plasma display apparatus of claim 1 , wherein the first negative voltage supply unit supplies the first negative voltage having a triangular waveform and the second negative voltage supply unit supplies the second negative voltage having a triangular waveform.