Portable information record medium having liquid crystal and pho

Details Portable information record medium having liquid crystal and pho Portable information record medium having liquid crystal and pho

1989-07-28

1991-10-08

Levy, Stuart S.

Registers

Records

Conductive

235380, 235487, 365108, G06K 1906, G11C 1301

Patent

active

050556622

ABSTRACT:
A portable prepaid card is disclosed comprising a substrate on which a photoconductive layer, a liquid crystal layer, and a transparent electrode plate are built up in this order. When an optical image is radiated on the photoconductive layer through the liquid crystal layer, the exposed regions and the unexposed regions of the photoconductive layer have different volume resistances. In this state, if a predetermined voltage is applied from the outside between the electrode plate and the photoconductive layer, a visible image corresponding to the radiated optical image is fixed in the liquid crystal layer.

REFERENCES:
patent: 3978320 (1976-08-01), McBride, Jr.
patent: 4392719 (1983-07-01), Sekimoto
patent: 4752820 (1988-06-01), Kuroiwa et al.
patent: 4799770 (1989-01-01), Kahn et al.
patent: 4810868 (1989-03-01), Drexler
patent: 4841128 (1989-06-01), Grotrup et al.
patent: 4954985 (1990-09-01), Yamazaki

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