Liquid crystal color displays
US4328493A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1980 |
| Grant date | May 4, 1982 |
| Priority date | — |
| Expiry date | Jan 23, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1392
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid crystal color display comprises a cathode ray tube which emits at two or more wavelengths, a liquid crystal cell, a neutral analyzer and two color selective polarizers. The cell is switched in synchronism with different images supplied to the cathode ray tube so that the different images are observed in the different colors simultaneously. The cell is respectively switched ON and OFF by application of signals at a low frequency f.sub.1 and a high frequency f.sub.h. To avoid a patch appearance due to different parts of the liquid crystal having different twists a gap is allowed between switching the signals f.sub.1 and f.sub.h so that the total shear of the liquid crystal may be kept below a critical shear value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.