Hologram screen and a method of producing the same
US6421147B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1999 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Jul 6, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0118
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, when a white light (image light) is projected on the hologram screen; and when a distance between two points at optional two points A and B on a surface of the hologram screen is given by 20 cm or less, and a value of the CIE 1976 chromaticity coordinate (u′, v′) at the point A is given by (u′A, v′A) and the value of the CIE 1976 chromaticity coordinate (u′, v′) at the point B is given by (u′B, V′B); the output light perpendicularly from the surface of the hologram screen has a color distribution in which a color difference &Dgr;u′v′ between two points A and B is derived from the following formula (1) and given by 0.06 or less, where, the formula (1) is expressed by,&Dgr;u′v′=[(u′A−u′B)2+(v′A−v′B)2]½  (1)Further, the output light, which is output to a viewpoint defined by the following formula (2) from the surface of the hologram screen, has the color distribution in which a color difference &Dgr;u′v′…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.