Method of driving ferroelectric liquid crystal without timing co

Details Method of driving ferroelectric liquid crystal without timing co Method of driving ferroelectric liquid crystal without timing co

1989-10-25

1991-09-17

James, Andrew J.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359103, G02F 113, G09G 300, G09G 336

Patent

active

050489348

ABSTRACT:
In a method of driving a ferroelectric liquid crystal display panel, a non-selection voltage B is continuously applied to a scanning electrode L.sub.i from the time at which the selection voltage A is applied to the scanning voltage L.sub.i to the time at which the selection voltage A is again applied to the scanning electrode L.sub.i. Further, succeeding erasing voltage H is applied to the scanning electrode L.sub.i at the time N.times.t.sub.0 before the application of the selection voltage A. Thereby, approximately the same effect as realized by the application of voltage -V.sub.g for P.times.t.sub.0 can be provided on a pixel A.sub.ij. This occurs irrespective of whether a bright voltage D or a dark voltage E is applied to a signal electrode S.sub.j. Thus, the pixel A.sub.ij can be set to the dark memory state. At the time Q.times.t.sub.0 before the application of the succeeding erasing voltage H to the scanning electrode L.sub.i, a compensation voltage G is applied. Thus, driving with no DC component left on the pixel A.sub.ij can be realized.

REFERENCES:
patent: 4808991 (1989-02-01), Tachiuchi et al.
patent: 4878741 (1989-11-01), Fergason
patent: 4903875 (1990-06-01), Inoue et al.
patent: 4904064 (1990-02-01), Lagerwall et al.
patent: 4922240 (1990-05-01), Duwaer
patent: 4925277 (1990-05-01), Inaba
patent: 4938574 (1990-07-01), Kaneko et al.
Japanese Technological Report Entitled "Matrix-Addressing of Ferroelectric Display Devices" to Shimizu et al., 2/3/1961, Institute of Television Engineers of Jap.

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