Chiral nematic photo displays
US8329058B2 · kind B2 · utility
1Cited by
92References
42Claims
0Family size
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Key dates
| Filing date | Jun 13, 2007 |
| Grant date | Dec 11, 2012 |
| Priority date | — |
| Expiry date | Feb 9, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/03
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photodisplay device in which an optically addressed image can be viewed indefinitely, erased and readdressed with a new image is disclosed. Optically responsive reversible photochiral materials are incorporated into a bistable cholesteric liquid crystal in an electrooptic display cell. A high resolution image exposed on the cell is fixed by a low voltage pulse to unpatterned electrodes and can be, at a later time, erased with a high voltage pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.