Liquid crystal light valve showing an improved display contrast
US5051570A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1990 |
| Grant date | Sep 24, 1991 |
| Priority date | — |
| Expiry date | Jan 19, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/136277
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optically-addressed liquid crystal light valve comprises a transparent insulating substrate having either one-dimensional or two-dimensional arrays of optical switching elements thereon which can perform switching with an incident light, another opposing transparent substrate having transparent electrodes and a liquid crystal sandwiched therebetween. Each of the light switching elements comprises a photo-detector circuit and a thin-film-transistor (TFT) drive circuit. The photo-detector circuit comprises a serially connected photodiode and a passive element such as capacitor or resistor. The TFT drive circuit receives as input the voltage produced from the photo-detector circuit, while the output voltage from the TFT drive circuit is applied to one pixel electrode for the liquid crystal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.