High definition color display device
US5172222A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1990 |
| Grant date | Dec 15, 1992 |
| Priority date | — |
| Expiry date | Jan 29, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3105
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The device finds application, particularly, in the instrument panels of aircraft, where it comprises: three liquid crystal optical valves, controlled by three electrical signals respectively representing a red image, a green image and a blue image. Two holographic mirrors are utilized, as is a standard mirror and two dichroic strips to illuminate the three valves respectively by three beams, colored red, green and blue, from a single source of white light, while at the same time reducing the space occupied by the optical elements needed to guide the three beams to the minimum. A dichroic cube then superimposes the three beams coming respectively from the three valves and an optical system to form a trichromatic image on a diffusing screen. The optical system collimates the rays coming from the image formed on the diffusing screen to enable an observer to see an image collimated at long distance, with a wide field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.