Method and apparatus for driving optical modulation device

Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...

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350332, 350333, 350335, 340765, G02F 113, G09G 318

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047782609

ABSTRACT:
An improvement in a driving method for an optical modulation device having a plurality of picture elements arranged in N lines, each picture element including a pair of oppositely spaced electrodes, and an optical modulation material disposed therebetween and showing at least two stable states with respect to an electric field. A writing operation is carried out respectively for a plurality of blocks each comprising a plurality (n) of lines, the writing operation including: (a) a first step of applying such a voltage signal to picture elements arranged on the n lines as to provide the picture elements with a display state based on a first stable state of the optical modulation material, and (b) a second step of applying such a voltage signal to selected picture elements on the n lines line-by-line as to provide the selected picture elements with a display state based on a second stable state of the optical modulation material; wherein N and n are integers satisfying the relation of N>n.

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patent: 4448490 (1984-05-01), Shibuya et al.
patent: 4638310 (1987-01-01), Ayliffe
patent: 4655561 (1987-04-01), Kanbe et al.
patent: 4693563 (1987-09-01), Harada et al.
A. R. Kmetz, "Nonemissive Electrooptic Display", Plenum Press, New York, 1976, pp. 261-289.
T. B. Brody, J. A. Asars, G. D. Dixon, "A 6.times.6 Inch 20 Lines per Inch Liquid Crystal Display Panel", IEEE Trans. on Elect. Devices, vol. ED-20, No. 11, Nov. 1973.

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