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A compensative driving method for common‐electrode voltage distortions in TFT‐LCDs
Author(s) -
Tomita Satoru,
Tomita Osamu,
Kasahara Koichi
Publication year - 1993
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.1984862
Subject(s) - voltage , liquid crystal display , materials science , electrode , waveform , signal (programming language) , capacitor , distortion (music) , crosstalk , computer science , optoelectronics , electrical engineering , optics , physics , engineering , amplifier , cmos , quantum mechanics , programming language
— The results of the investigation and analysis of common‐electrode (counter‐electrode) voltage distortions in TFT‐LCDs are described. The distortions are mainly caused by voltage changes in signal bus‐lines and lead to horizontal crosstalk and degradation of the contrast ratio. A new driving method, in which an ac voltage is applied independently to the storage‐capacitor bus‐lines, is proposed to compensate for the distortions. The effect has been confirmed by comparing it with a conventional driving method by waveform observation, horizontal‐crosstalk observation, and signal‐voltage‐light‐transmission characteristics in both common‐dc and common‐ac drives. It has been further confirmed that the new method can compensate for another distortion of voltages across the liquid‐crystal layer, which does not occur for the common‐dc drive.