Method for driving an X-Y matrix type liquid crystal display pan

Details Method for driving an X-Y matrix type liquid crystal display pan Method for driving an X-Y matrix type liquid crystal display pan

1977-09-12

1979-06-19

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358236, 350333, H04N 566, G02F 128

Patent

active

041588606

ABSTRACT:
The present invention relates to a driving method for displaying television signals on an X-Y matrix type liquid crystal display panel having both switching elements and memory elements for respective picture elements which utilizes the phenomenon that high frequencies reduce the erasing time of the liquid crystals. According to the present invention, when a panel is driven by means of a line at a time process, each horizontal scanning period is divided into two periods, a video signal period and a erasing signal period, thereby to provide a composite signal having a video signal portion and an erasing signal portion so that a first pulse corresponding to the video signal period writes the video signal on that panel and a plurality of second pulses corresponding to the erasing signal period applies the erasing signal to the panel for erasing.

REFERENCES:
patent: 3575492 (1971-04-01), Nester et al.
patent: 3575493 (1971-04-01), Heilmeier
Liquid Crystal Matrix Displays, Lechner et al., Proceedings of the I.E.E.E., vol. 59, No. 11, Nov. 1971.

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