Matrix addressing of cholesteric liquid crystal display

Details Matrix addressing of cholesteric liquid crystal display Matrix addressing of cholesteric liquid crystal display

1983-03-17

1986-02-18

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340805, 350346, G09G 336

Patent

active

045715858

ABSTRACT:
Methods for matrix addressing a liquid crystal display, utilizing the cholesteric-to-nematic phase change for information display, provides a voltage to each of a plurality of scanned electrodes. A preferred voltage waveform has a first non-zero value during an erase interval and a greater non-zero value during a display-write interval. The combined erase and write intervals occur, for each scanned electrode, once during a multiplex time interval. Each of another plurality of electrodes, arranged adjacent to the remaining surface of a liquid crystal layer and perpendicular to the scanned electrodes, are sequentially energized with a non-zero voltage having a polarity change coincident with the erase and write intervals when that portion of a display at the intersection of the first and second plurality of electrodes is to be addressed. If the inverted-polarity voltage is in phase with the scan electrode voltage, the liquid crystal material is switched to the cholesteric state and absorbs incident light, whereas if the inverted-polarity voltage is out-of-phase with the scan electrode erase-write pulse, the intersection is switched to the nematic state and incident light is transmitted through the cell substantially without attenuation.

REFERENCES:
patent: 3816824 (1974-06-01), Thust et al.
patent: 3936815 (1976-02-01), Kogure et al.
patent: 4317115 (1982-02-01), Kawakami et al.
patent: 4405209 (1983-09-01), Funada et al.
patent: 4408201 (1983-10-01), Harada

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