Photo-image memory panel and activating method therefor
US4024389A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1975 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | Aug 7, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C13/047
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.