Visual display device with memory and telephone exchange...

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

G - Physics

02

F

375/39, 379/51,

G02F 1/13 (2006.01) G02F 1/1333 (2006.01) G02F 1/1339 (2006.01) G02F 1/137 (2006.01)

Patent

CA 1157173

ABSTRACT OF THE DISCLOSURE The invention relates to display devices having a memory making it possible to display information supplied by electric signals and to maintain this dis- play when the signals have disappeared. In a smectic liquid crystal display cell it comprises providing means making it possible to move apart the two plates enclos- ing the liquid crystal layer so as to make the latter diffusive throughout. Parts of this crystal are then made transparent by applying thereto a reorientation electric field by means of a set of electrodes. It is intended for use more particularly in telephone exchanges having a device for the display of digital data transmitted on a telephone line.

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