Computer-generated hologram and its fabrication process, reflector using a computer-generated hologram, and reflective liquid crystal display
US6747769B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2001 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | May 30, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2260/63
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides a computer-generated hologram which can be viewed in white at the desired viewing region and a reflective liquid crystal display using the same as a reflector. The computer-generated hologram H is designed to diffuse light having a given reference wavelength &lgr;STD and incident thereon at a given angle of incidence &thgr; in a specific angle range. In a range of wavelengths &lgr;MIN to &lgr;MAX including the reference wavelength &lgr;STD wherein zero-order transmission light or zero-order reflection light of incident light on the computer-generated hologram at a given angle of incidence is seen in white by additive color mixing, the maximum diffraction angle &bgr;2MIN of incident light of the minimum wavelength &lgr;MIN in the wavelength range and incident at the angle of incidence &thgr; is larger than the minimum diffraction angle &bgr;1MAX of incident light of the maximum wavelength &lgr;MAX in the wavelength range and incident at said angle of incidence &thgr;.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.