Method of addressing a ferroelectric liquid crystal display

Details Method of addressing a ferroelectric liquid crystal display Method of addressing a ferroelectric liquid crystal display

1988-09-02

1991-09-10

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340805, 359 56, G09G 336, G09G 300

Patent

active

050477579

ABSTRACT:
A method is disclosed for addressing a matrix-array type liquid crystal layer. The cell has a plurality of pixels which are defined by regions of overlap between two sets of electrodes which sandwich a liquid crystal layer, each pixel having two states. The response time for switching between the two states is dependent upon the voltage across the liquid crystal layer, with a minimum occurring at a particular voltage. The method includes applying a strobe waveform to a selected member of a first set of the electrodes while a data waveform is applied to each member of the second set of electrodes. A waveform for switching a pixel defined by the selected member comprises a switching pulse of a given voltage magnitude and given duration. A waveform for not switching a pixel defined by the selected member comprises a non-switching pulse of a voltage magnitude greater than the given voltage magnitude of the switching pulse and a duration less than the given duration of the switching pulse.

REFERENCES:
patent: 4591585 (1986-02-01), Stein et al.
patent: 4728947 (1988-03-01), Ayliff et al.
patent: 4850676 (1989-07-01), Yazaki et al.

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