Automotive head-up display with high brightness in daytime and high contrast in nighttime
US5053755A · kind A · utility
52Cited by
7References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 18, 1989 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | May 18, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0187
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A head-up display having an image source for producing imaging illumination, an optical combiner for partially reflecting the imaging illumination to produce a virtual image of the image source that is viewable by the operator of the vehicle, and a polarizer which can be controllably interposed between the image source and the optical combiner for nighttime use. The polarizer tends to block the illumination that otherwise would produce objectionable ghost images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.