Avoiding interference artifacts in a head-up display or a reflected see-through type display
US7791807B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2008 |
| Grant date | Sep 7, 2010 |
| Priority date | — |
| Expiry date | Apr 11, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0121
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Briefly, in accordance with one or more embodiments, a birefringent layer may be utilized in conjunction with a head-up display (HUD) for a vehicle or the like, for example where the birefringent layer is disposed in or on the windshield. The birefringent layer may impart a change in the polarization of light emerging from a projector of the head-up display in order to reduce or minimize interference between beams from the display and reflecting off of two or more surfaces that are combined at the viewer's eye, and/or to reduce or minimize the effect of polarizing sunglasses on the viewability of the image projected by the display. In one or more embodiments, the birefringent layer alters the polarization of the light reaching the viewer's eye if the user is wearing polarizing glasses or lenses so that less light from the display is blocked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.