Real-time ultra-high resolution image projection display using laser-addressed liquid crystal light valve
US4611245A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 1984 |
| Grant date | Sep 9, 1986 |
| Priority date | — |
| Expiry date | Oct 29, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7441
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A wide screen display enables a number of viewers the simultaneous viewing f rapidly updated data in real time at video rates. A beam of coherent radiation from a laser is modulated at video rates in an acousto-optic modulator. The modulated beam is fed to an X-scanner that imparts an acousto-optic displacement of the modulated beam in the X-direction. A Y-scanner is aligned to receive the X-scanned modulated beam and imparts an acousto-optic reciprocal displacement of the beam so that the video modulated beam is displaced in both the X- and Y-directions. A liquid crystal light valve is disposed to receive the X and Y displaced modulated beam so that it scans the surface of the light valve to stimulate the photosensor layers within. This causes the impression of a replica voltage pattern on a bi-refringent liquid crystal in the valve. A high intensity lamp projects a high intensity incoherent light beam onto the liquid crystal light valve via a polarizing biprism. Since the bi-refringent liquid crystal has been modulated by the X- and Y-scanned modulated coherent beam, a corresponding image is reflected from the bi-refringent liquid crystal and onto the screen. The acousto-optic mo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.