Reduction of background light by modified voltage waveform in AC plasma display panel

Abstract

The voltage waveform applied in the reset period has been modified to lower the background light, which is one of the causes of the image quality degradation in the AC plasma display panel. In general, the ramp waveform is used to generate a weak plasma discharge during the reset period, but still considerable background light is generated, which lowers the contrast ratio of the AC PDP. Lowering the slope of the ramp waveform in order to lower the background light takes a lot of reset time. If the reset voltage is lowered, the strength of the write discharge, which is the next step, is weakened and the discharge also fails. In this study, we investigated the timing of discharge generation during the reset period to reduce the background light while maintaining the intensity of the write discharge without increasing the reset time. Thereafter, the application of the ramp waveform was temporarily stopped at the time when the discharge occurred, and the intensity of the discharge was controlled by applying again when the discharge became weak. As a result, the background light could be shortened from 0.71 to 0.52 cd/m2.