Head up display with modular projection system
US6402321B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1999 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Oct 29, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/30
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A head up display system is disclosed that includes a housing, an aspheric reflector, and a modular projection unit. The modular projection unit includes a backlight, a spherical reflector, an infrared mirror, one or more display devices, and cooling apparatus. The backlight has a spherical reflector with inner and outer reflective spherical surfaces and a central opening that is used to recycle light and provide a desired aperture shape. The one or more display devices may be liquid crystal displays, such as active matrix liquid crystal displays. Exemplary cooling apparatus includes an air inlet, a fan and an air outlet that forces air past heat generating components of the projection unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.