Lensless helmet/head mounted display
US5715094A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1996 |
| Grant date | Feb 3, 1998 |
| Priority date | — |
| Expiry date | Dec 3, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0132
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A helmet/head mounted display including a display image source and a reflective visor for each eye. The image source includes a fiber optic cover plate with a planar input surface and a curved output surface which has curvature providing the correct curvature. The image source further includes a self-emitting device such as a field electrode display or electroluminescent device, or a polymer dispersed liquid crystal (PDLC) sandwiched between a thin, sharply tapered fiber optic plate and the fiber optic cover plate. For the PDLC image source, back light illumination is introduced through the tapered fiber optic plate, passes through or is scattered by the PDLC and then through the fiber optic face plate to the visor, for reflection to the observer's eye. The fiber optic face plate is constructed with a very low numerical aperture. The fibers of the cover plate are oriented toward the eye as seen in the reflection from the visor to reduce undesirable reflected light. No lenses or beam splitters are in the light path between the image source and the visor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.