Reflection hologram multiple-color filter array formed by sequential exposure to a light source
US5537232A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 5, 1993 |
| Grant date | Jul 16, 1996 |
| Priority date | — |
| Expiry date | Oct 5, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multiple-color filter array (94) useful as part of a flat panel display system of either a projection (50) or direct view (70) type is constructed using reflection holography techniques. The filter array includes multiple-color filter elements (110, 114, 116) that reflect wavelengths of light corresponding to colors outside of a color band of interest. Redundant sets of first, second, and third wavelengths selective reflective color filter elements are arranged in stripes to transmit light of the three primary colors red, green, and blue. The three-color filter array is constructed in a single layer (122) of holographic recording material during one sequence of three separate exposures, one for each color filter element. A preferred flat panel display system (200) includes a liquid crystal variable optical retarder of the supertwisted nematic (STN) type. The direct view system includes a spurious light reflection absorber (204), one of whose optical components is selected in association with the residual retardation compensator plate (214) of the preferred liquid crystal variable optical retarder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.