Non-speckle liquid crystal projection display
US6122023A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1998 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Jul 28, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1334
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A non-speckle laser projection display composed of a liquid crystal material for the generation of a high resolution, non-speckle image. The projection display screen includes a liquid crystal material which is constructed in a highly scattered state when no drive voltage is applied. When a high frequency, low voltage signal is applied to the liquid crystal projection display screen, the liquid crystal molecules vibrate slightly at a frequency higher than 60 Hz, thereby causing the speckle pattern to change quickly, and causing the eye to smooth out and see no speckle. In addition, provided is a non-speckle laser display system in which included is a laser image source and the liquid crystal projection display screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.