Fringe-field switched storage-effect liquid crystal display devi

Details Fringe-field switched storage-effect liquid crystal display devi Fringe-field switched storage-effect liquid crystal display devi

1982-06-30

1985-09-24

Corbin, John K.

350339R, G02F 1133

Patent

active

045429600

ABSTRACT:
A four terminal liquid crystal display device includes orthogonally related row and column electrodes separated by a dielectric and disposed in respective sets above and below the liquid crystal medium. The electrodes in proximity to the LC medium are the column electrodes which have a small alternating square wave bias voltage.+-.Vo imposed therebetween so that a voltage of 2Vo magnitude is normally impressed across the LC medium. When an impulse voltage of magnitude 4Vo is impressed across the exterior row electrodes (+2Vo and -2Vo respectively), since the column electrodes are foraminated or have microapertures therethrough, the electric field established between the row and column electrodes in opposite sets, 3Vo, extends through the microapertures into the LC medium to establish a fringe electric field normal to the surfaces of the column electrodes tending to retain the LC directors in the vertical position. This arrangement avoids the imposition of large voltages directly across the LC media and permits the application of low voltages to the electrodes and thereby increases the life of only the column LC media which are otherwise degraded by high voltages.

REFERENCES:
patent: 3787110 (1974-01-01), Berreman et al.
patent: 3914019 (1975-10-01), Byatt
patent: 4200361 (1980-04-01), Malvano et al.
patent: 4277786 (1981-07-01), Waldron
patent: 4370194 (1983-01-01), Shaver et al.
patent: 4386836 (1983-06-01), Aoki et al.
patent: 4429955 (1984-02-01), Portmann
patent: 4444125 (1984-05-01), Clerc et al.

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