Communications: electrical – Systems – Portable self-contained
Patent
1976-08-12
1977-08-16
Curtis, Marshall M.
Communications: electrical
Systems
Portable self-contained
340336, 350160LC, G06F 314
Patent
active
040429202
ABSTRACT:
A multiplexed electrical control circuit is provided for use with optical display devices of the type wherein electrical intelligence is translated into optical images of letters or numbers or other patterns through the use of a liquid crystal shutter device fully described in a copending application Ser. No. 136,441, filed Apr. 22, 1971. The shutter device comprises a layer of liquid crystal material sandwiched between opposing parallel plates coated with transparent conducting films. The shutter device, or liquid crystal cell, is disposed between a pair of polarizers such that the application of electrical potential across a character, digit, or other image-defining segment and an opposing position-designating film will cause light to be transmitted or to be cut off, depending upon the orientation of the two polarizers. The multiplexing concept of the invention is based upon the discovery that the character, digit or other image-defining signal and the position-representing signal need to coincide only for a very brief period of time to switch a selected segment, in a given position, to an ON state. The switching is accomplished through a diode or other unidirectional conducting device so that the selected display element will hold its ON state until the voltage decays below the threshold as determined by the RC time constant. Each liquid crystal cell existing between a selected character segment and its selected opposing character position backing film then becomes an individually-actuable light shutter with a memory capacity due to its capacitive storage characteristic. As a result, it becomes possible to multiplex the control of many similar character or digit positions using the same character defining segment control signals.
REFERENCES:
patent: 3503673 (1970-03-01), Heilmeier et al.
patent: 3532813 (1970-10-01), Lechner
patent: 3653745 (1972-04-01), Mao
Liquid Crystal Polychromatic Display Device; Freiser, IBM Tech. Discl. Bull., vol. 15, No. 2, July 1972, pp. 700-701.
Dems Edd
Harsch Thomas B.
Curtis Marshall M.
Hoffmann-La Roche Inc.
Hopkins Mark L.
Leon Bernard S.
Welt Samuel L.
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