Photo-image memory panel and activating method thereof

Details Photo-image memory panel and activating method thereof Photo-image memory panel and activating method thereof

1974-06-12

1976-06-29

Lieberman, Eli

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

H01J 3150

Patent

active

039671127

ABSTRACT:
Disclosed is a photo-image memory panel composed of an electroluminescent element which exhibits electrical polarization effects upon light excitation. Under the conditions when the panel is biased by DC voltage or DC offset voltage, light irradiation is applied to the panel to establish a light-activated polarized electric field of which the intensity is controllable in dependence upon a photo-image desired to be written into the panel. Then, the photo-image written into the panel is held while maintaining the polarized electric field. Thereafter, application of a predetermined voltage pulse enables the reading out of the photo-image in the form of light emission. Alternatively, in case of an electroluminescent element of which the light emission versus applied voltage characteristics involve the hysteresis phenomenon, a train of alternating current pulses are employed as reading-out pulses to maintain light emission corresponding to the read-out image.

REFERENCES:
patent: 2926263 (1960-02-01), Kazan
patent: 2928993 (1960-03-01), Liebson
patent: 2972692 (1961-02-01), Thornton
patent: 3169192 (1965-02-01), Kohaski
patent: 3443332 (1969-05-01), Christy
patent: 3589896 (1971-06-01), Wilcox
patent: 3644741 (1972-02-01), Ovshinsky
patent: 3699374 (1972-10-01), Scholl et al.

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