Method of driving a matrix type phase transition liquid crystal

Details Method of driving a matrix type phase transition liquid crystal Method of driving a matrix type phase transition liquid crystal

1979-10-01

1983-04-12

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340805, 350346, G09G 336

Patent

active

043800084

ABSTRACT:
Disclosed is a method of driving a matrix type display panel which includes a phase transition liquid crystal layer sandwiched between a pair of electrode groups arranged in the form of a matrix and including at least one transparent electrode group, and employs intersecting portions of said electrode groups as display segments for displaying information by driving one electrode group with the one-line-at-a-time scanning system; wherein a write-in voltage signal having a sufficient root mean square value for the phase transition of the liquid crystal layer and an erasing voltage substantially equal to OV are employed to drive the panel, and segments just subjected to scanning are applied with the write-in voltage signal when information is written in the segments and are applied with the erasing voltage when information written in the segments is erased.

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Pulse Length Modulation Achieves Two-Phase Writing in Matrix-Addressed Liquid Crystal Information Displays; Walter et al.; IEEE Transactions on Electron Devices; ED-25, #2; 2/78; pp. 172-174.

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