Title: Photo-image memory panel and activating method therefor

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.

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Inventors: Kanatani, Yoshiharu (Tenri, JA)
Ise, Masahiro (Tenri, JA)
Mizukami, Etsuo (Tenri, JA)

Application Number: 602669
Filing Date: 1975-08-07
Publication_date: 1977-05-17
Assignee: Sharp Kabushiki Kaisha (Osaka, JA)
Primary Class(es): 250/214LA 313/509
Other Classes:
US Patent Ref:

3169192	Feb, 1965	Kohashi	250/213.
3548214	Dec, 1970	Brown	250/213.
3644741	Feb, 1972	Ovshinsky	340/173.
3699374	Oct, 1972	Scholl et al.	250/213.
3711719	Jan, 1973	Szepesi	313/485.

Other Refs:
Primary Examiner: Nelms, David C.
Assistant Examiner:
Attorney: Birch, Stewart, Kolasch and Birch