Color display device with chirped diffraction gratings
US5615024A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1993 |
| Grant date | Mar 25, 1997 |
| Priority date | — |
| Expiry date | Aug 10, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A display device comprises a liquid crystal spatial light modulator (1) associated with diffractive means, such as a diffraction grating comprising grating elements (5). The diffraction grating is illuminated by a light source (6, 7) and each element is chirped and blazed so as to separate the primary colors of the illuminating light and direct them to individual light-modulating elements (R, G, B) of the modulator (1). By dispensing with conventional color filters, the efficiency of the display device is improved. Further, the focusing action of the grating elements (5) directs light to the elements of the modulator (1) so as to prevent light wastage caused by blocking of light by opaque regions of the display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.