Optimization of sustaining frequency for high efficiency driving in AC-PDP

摘要

The panel structure widely adopted in commercial AGPDP is three electrodes surface discharge type. At a given panel structure, a driving method should be optimized to get a sufficient luminous efficiency. The display image of AC-PDP could be realized by the repeated light emission from the discharge. Because most of discharge power is consumed in the sustaining period, the optimization of sustaining waveform is very important for the high luminous efficiency. ADS (Address and Display period Separated) driving method is commonly used. The average driving frequency of ADS driving method is ranged by several tens kilo of kHz, however the actual frequency of sustaining period is in range of 100kHz to 200kHz. Based on this study, when the phosphor emits the visible light, it has a decay time of few milliseconds due to the material characteristics. If the decay time is longer than the sustaining pulse period, the VUV could not effectively transfer to the phosphor to emit the visible light. Consequently the luminous efficiency decreases in proportion to the driving frequency. It is found that the luminous efficiency could be significantly improved by the low frequency sustaining driving method.