Information recording method having a liquid crystal substrate
US5587987A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1995 |
| Grant date | Dec 24, 1996 |
| Priority date | — |
| Expiry date | Sep 22, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/135
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Changes-with-time in the voltages of exposed and unexposed portions of a liquid crystal recording layer with respect to a photoconductive layer having a varying dark current value are found by varying an applied voltage, and the applied voltage and the value of a dark current through the photoconductive layer are determined such that when the voltage of the unexposed portion of the liquid crystal recording layer reaches the threshold voltage of the liquid crystal recording layer, the difference in voltage between the exposed and unexposed portions of the liquid crystal recording layer reaches a maximum, so that information is recorded with the photoconductive layer and at the applied voltage, where a potential difference is obtained, which is at least one half of the difference (maximum contrast) in the voltages applied on the liquid crystals at the exposed and unexposed portions of the liquid crystal recording layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.