Optical sensitization and development of liquid crystalline devi

Details Optical sensitization and development of liquid crystalline devi Optical sensitization and development of liquid crystalline devi

1974-07-17

1976-03-16

Smith, Alfred E.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250213R, G02F 113

Patent

active

039443329

ABSTRACT:
Increased sensitization of liquid crystalline devices utilizing current flow to provide a change in optical characteristics is provided by sandwiching a photoconductive layer between an insulating layer and a liquid crystalline layer wherein all three layers are placed between two electrodes. The sandwich device is utilized in an imaging method wherein an electrical potential is applied across said device, a bias or sensitizing light is utilized to bring the device up to the threshold for gain photocurrent and then removed, and wherein a subsequent light is utilized to gate or initiate gain photocurrent. Alternatively, the biasing light may be in imagewise configuration which forms a latent image in which case the subsequent light can be a uniform exposure which gates the gain photocurrent, thereby developing the latent image.

REFERENCES:
patent: 3642348 (1972-02-01), Wysocki et al.
patent: 3732429 (1973-05-01), Braunstein et al.

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