Head mount display apparatus allowing easy switching operation from electronic image to external field image
US5621424A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1995 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Feb 16, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N13/398
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display apparatus, which can be mounted on the head portion of a man, includes a two-dimensional display unit for displaying an image. A projection optical system projects the image displayed on the two-dimensional display unit onto the retina of the eyeball of a user. A shutter is arranged in front of the eyeball of the user. A detector detects at least a forward inclination of motions of the head portion of the user. A control unit controls the shutter in accordance with the output from the detector to switch the shutter between a light transmission state and a light shielding state. A housing incorporates and holds the two-dimensional display unit, the projection optical system, the shutter, and the detector to be mountable on the head portion of the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.