Method of driving a recording apparatus

Details Method of driving a recording apparatus Method of driving a recording apparatus

1985-08-27

1988-07-05

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340805, 350331T, G09G 336

Patent

active

047558121

ABSTRACT:
A method of driving a liquid crystal recording device comprises applying a drive signal to liquid crystal micro shutters defined at the intersection of common electrodes that are normal to signal electrodes. The drive signal is a signal experienced by a microshutter as a result of the application of a selected signal to the common electrode and the application of a recording signal to the signal electrode. Both the selected and recording signals contain components of frequencies grater and less than a specified frequency which causes the dielectric anistotropy of the liquid crystal to disappear. A drive signal which opens or closes microshutters for a selected period of time includes a signal whose frequency is lower than said specified frequency, and superposed waveform obtained when the signal whose frequency is loser than the specified frequency is superposed upon a signal whose frequency is higher than the specified frequency. A driving waveform which reversely sets the microshutters open or closed for the selected period of time is formed of a signal including a frequency higher than the specified frequency and a zero frequency signal. As a consequence of the application of signals of this nature to the microshutters, the temperature characteristics of the liquid crystal microshutters are improved.

REFERENCES:
patent: 4236150 (1980-11-01), Chern
patent: 4386836 (1983-06-01), Aoki et al.
patent: 4417785 (1983-11-01), Nakamura
patent: 4462027 (1984-07-01), Lloyd
patent: 4641156 (1987-02-01), Ohta et al.

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