Holographic head up display
US5917459A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1997 |
| Grant date | Jun 29, 1999 |
| Priority date | — |
| Expiry date | Jan 17, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0118
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A color holographic head up display which can be mounted on, for example, an airplane or automobile for projecting a color image displayed on a screen. The color holographic head up display in accordance with the present invention comprises an information display comprising a 2-dimensional array of pixels for displaying information to be projected, a relay optical system for relaying an image displayed on the information display, and a holographic combiner having holographic optical elements whose number is the same as the number of the pixels of the information display for delivering the image from the relay optical system to the viewing zone of the human eye, the holographic optical elements being arranged to correspond to the pixels of the information display. According to the present invention, the surrounding scenery and navigation information of a color image are simultaneously projected without noise due to intermodulation, and a high diffraction efficiency can be achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.