Method and apparatus for driving plasma display panel
A method and apparatus for driving a plasma display panel (PDP) is disclosed to reduce noise generated during a discharge sustain period, wherein a timing signal generator includes a first random timing signal generator and a second random timing signal generator, and wherein the first random timing signal generator generates randomly changes a cycle of a scan timing signal for a scan driver to generate a discharge sustain voltage, and the second random timing signal generator randomly changes a cycle of a sustain timing signal for a sustain driver to generate a discharge sustain voltage, and whereby a cycle of the discharge sustain voltage is variably generated in response to the scan timing signal and the sustain timing signal where cycles are randomly varied.
1 . A method for driving a plasma display panel (PDP) comprising: applying a driving voltage to scan electrodes during an initialization period to initialize cells; applying a driving voltage to scan electrodes during address period and applying image data to address electrodes to generate a start discharge to the initialized cells; and applying a cycle-randomly-varied discharge sustain voltage to the scan electrodes and sustain electrodes during a discharge sustain period to sustain discharges of cells where the start discharge has been generated.
2 . The method as claimed in claim 1 , wherein the cycle of the randomly-varied discharge sustain voltage is randomly varied within a predetermined time range.
3 . The method as claimed in claim 2 , wherein the predetermined time range is ±0.05˜1 μs.
4 . The method as claimed in claim 1 , wherein the randomly-varied discharge sustain voltage is such that a rising edge voltage maintaining interval where the discharge sustain voltage rises and maintains during the rising edge is randomly varied.
5 . The method as claimed in claim 1 , wherein the randomly-varied discharge sustain voltage is such that a falling edge voltage maintaining interval where the discharge sustain voltage falls and maintains during the rising edge is randomly varied.
6 . The method as claimed in claim 1 , wherein the randomly-varied discharge sustain voltage is such that a rising edge voltage maintaining interval where the discharge sustain voltage rises and maintains during the rising edge and a falling edge voltage maintaining interval where the discharge sustain voltage falls and maintains during the rising edge are randomly varied.
7 . An apparatus for driving a plasma display panel (PDP) comprising: a timing signal generator for generating a scan timing signal, a sustain timing signal and an address timing signal in response to control of a processor; a scan driver for generating a driving voltage in response to the scan timing signal and applying the driving voltage to scan electrodes; a sustain driver for generating a driving voltage in response to the sustain timing signal and applying the driving voltage to sustain electrodes; and an address driver for applying image data to address electrodes in response to the address timing signal, wherein the timing signal generator comprises: a first random timing signal generator for randomly varying a generation cycle of the scan timing signal during discharge sustain period; and a second random timing signal generator for randomly varying a generation cycle of the sustain timing signal during the discharge sustain period.
8 . The apparatus as claimed in claim 7 , wherein the first and second random timing signal generators randomly vary the generation cycle of the scan timing signal and the sustain timing signal within a predetermined time range.
9 . The apparatus as claimed in claim 8 , wherein the predetermined time range is ±0.05˜1 μs.
10 . The apparatus as claimed in claim 7 , wherein the first random timing signal generator generates a scan timing signal such that the rising edge voltage maintaining interval of a driving voltage generated by the scan driver is randomly varied.
11 . The apparatus as claimed in claim 7 , wherein the first random timing signal generator generates a scan timing signal such that the falling edge voltage maintaining interval of a driving voltage generated by the scan driver is randomly varied.
12 . The apparatus as claimed in claim 7 , wherein the first random timing signal generator generates a scan timing signal such that the rising edge voltage maintaining interval and the falling edge voltage maintaining interval of a driving voltage generated by the scan driver is randomly varied.
13 . The apparatus as claimed in claim 7 , wherein the second random timing signal generator generates a sustain timing signal such that the rising edge voltage maintaining interval of a driving voltage generated by the sustain driver is randomly varied.
14 . The apparatus as claimed in claim 7 , wherein the second random timing signal generator generates a sustain timing signal such that the falling edge voltage maintaining interval of a driving voltage generated by the sustain driver is randomly varied.
15 . The apparatus as claimed in claim 7 , wherein the second random timing signal generator generates a sustain timing signal such that the rising edge voltage maintaining interval and the falling edge voltage maintaining interval of a driving voltage generated by the sustain driver is randomly varied.