Optical sensitization and development of liquid crystalline...

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

G - Physics

02

F

345/2

G02F 1/13 (2006.01) G02F 1/135 (2006.01)

Patent

CA 1049123

ABSTRACT OF THE DISCLOSURE 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 thickness ratio of the photoconductive layer to the insulating layer is at least about 10 to 1. 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 cast the subsequent light can be a uniform exposure which gates the gain photocurrent, thereby developing the latent image.

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