Visual display device with memory and telephone exchange incorpo

Details Visual display device with memory and telephone exchange incorpo Visual display device with memory and telephone exchange incorpo

1980-09-15

1983-05-31

Corbin, John K.

350333, 350346, G02F 113

Patent

active

043858074

ABSTRACT:
A display device having a memory making it possible to display information supplied by electric signals and to maintain this display when the signals have disappeared. In a smectic liquid crystal display cell the two plates enclosing the liquid crystal layer can be moved apart by a piezoelectric wedge so as to make the crystal diffusive throughout. Parts of this crystal are then made transparent by applying thereto a reorientation electric field by means of a set of electrodes. The device is intended for use more particularly in telephone exchanges having a device for the display of digital data transmitted on a telephone line.

REFERENCES:
patent: 3718382 (1973-02-01), Wysocki et al.
patent: 4040047 (1977-08-01), Hareng et al.
Heidrich, P. F. et al., "Switching of Nematic Liquid Crystals by Surface Waves", IBM Disclosure Bulletin, vol. 15, No. 1, (Jun. 1972), pp. 165-167.
Bartolino, R. et al., "Ultrasonic Modulation of Light with a Liquid Crystal in the Smectic-A and Nematic Phases", Journal of Applied Physics, vol. 46, No. 5, (May 1975), pp. 1928-1933.

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