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Dual-Slope Ramp Reset Waveform to Improve Dark Room Contrast Ratio in AC PDPs
Heung-Sik TAE Jae-Kwnag LIM Byung-Gwon CHO
IEICE TRANSACTIONS on Electronics
Publication Date: 2005/12/01
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Displays
plasma display panel, dual-slope ramp reset waveform, dark room contrast ratio, background luminance,
Full Text: PDF(814.4KB)>>
A new dual-slope ramp (DSR) reset waveform is proposed to improve the dark room contrast ratio in AC-PDPs. The proposed reset waveform has two different voltage slopes during a ramp-up period. The first voltage slope lower than the conventional ramp voltage slope plays a role in producing the priming particles under the low background luminance, which is considered to be a kind of pre-reset discharge. On the other hand, the second voltage slope higher than the conventional ramp voltage slope produces a stable reset discharge due to the presence of the priming particles, but gives rise to a slight increase in the background luminance. Thus, a bias voltage is also applied during a part of the second voltage-slope period to adjust the background luminance and address discharge characteristics. As a result, the proposed dual-slope reset waveform can lower the background luminance without causing the discharge instability, thereby improving the high dark room contrast ratio of an AC-PDP without reducing the address voltage margin.