Scrolling color sequential illumination system
US6709124B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2002 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Jun 20, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133622
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Illumination systems (11) are disclosed which provide scrolling progressive color change on a liquid crystal panel (21), such as a LCoS panel. The systems use transmissive color filters (30, 31, 33) which form an assembly (13) which is rotated about a rotation axis (37). Incident light from a light source (15, 17) passes through the filters and reflects from a reflecting surface (39). As a result of this reflection, the system's optical axis (41, 43) is turned from an orientation substantially perpendicular to the rotation axis to an orientation which does not intersect a filter. Such turning of the optical axis allows colored light to be easily removed from the assembly and avoids problems with color mixing at boundaries between filters as occurs for systems in which light passes through two filters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.