Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1975-08-07
1977-05-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
313509, H01J 3150
Patent
active
040243893
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: 3169192 (1965-02-01), Kohashi
patent: 3548214 (1970-12-01), Brown
patent: 3644741 (1972-02-01), Ovshinsky
patent: 3699374 (1972-10-01), Scholl et al.
patent: 3711719 (1973-01-01), Szepesi
Ise Masahiro
Kanatani Yoshiharu
Mizukami Etsuo
Nelms David C.
Sharp Kabushiki Kaisha
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