Plasma display panel driving method having a high temperature and low temperature driving mode and plasma display device thereof
A plasma display panel driving method and a plasma display device estimate the highest temperature and the lowest temperature the panel can have, according to the temperature detected by the thermal sensor, and appropriately drives the panel, to improve the image display quality. Provided are at least three driving modes having different sub-field structures: a low-temperature driving mode, an ordinary-temperature driving mode, and a high-temperature driving mode. To drive the panel, estimates of the highest temperature and the lowest temperature the panel can have are made from the temperature detected by the thermal sensor, the temperature condition of the panel is determined from the estimated highest temperature or lowest temperature, and the driving mode is switched appropriately for the panel temperature condition.
1. A method of driving a plasma display panel in which one field has a plurality of sub-fields and each of the sub-fields includes a setup period for generating initializing discharge in discharge cells, an address period for generating address discharge in the discharge cells, and a sustain period for generating sustain discharge in the discharge cells having generated the address discharge therein, and the plasma display panel includes a thermal sensor, the method comprising:
estimating a lowest temperature and a highest temperature of the plasma display panel, according to a temperature detected by the thermal sensor; and
selecting one driving mode from a plurality of driving modes based on the estimated lowest temperature and the estimated highest temperature,
the plurality of driving modes have at least one different operation in the setup period, each driving mode includes sub-fields having an all-cell initializing operation to initialize discharge in all of the discharge cells in the setup period, and the at least one different operation includes driving the sub-fields having the all-cell initializing operation with a different maximum voltage or the at least one different operation includes driving a different number of the sub-fields having the all-cell initializing operation with the different maximum voltage in the setup period;
the estimated lowest temperature is calculated by subtracting a low-temperature correction temperature from the detected temperature,
the estimated highest temperature is calculated by adding a high-temperature correction temperature to the detected temperature, and
at least one of the low-temperature correction temperature and the high-temperature correction temperature increases, depending on a time from a start of driving the plasma display panel to a predetermined value.
2. The method of driving a plasma display panel of claim 1 , in which the driving modes includes at least a low-temperature driving mode to be used when the plasma display panel is at a low temperature, and a high-temperature driving mode to be used when the plasma display panel is at a high temperature, the method further including:
subtracting a predetermined low-temperature correction temperature from the temperature detected by the thermal sensor to calculate the estimated lowest temperature, and when the estimated lowest temperature is at most a predetermined low-temperature threshold, driving the plasma display panel in the low-temperature driving mode; and
adding a predetermined high-temperature correction temperature to the temperature detected by the thermal sensor to calculate the estimated highest temperature, and when the estimated highest temperature is at least a predetermined high-temperature threshold, driving the plasma display panel in the high temperature driving mode.
3. The method of driving a plasma display panel of claim 2 , wherein at least one of the low-temperature correction temperature and the high-temperature correction temperature is a predetermined value independent of time.