Information display system having transparent holographic optical element
US5291316A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1991 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Sep 27, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2001/2236
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An information display system has a display screen which is substantially transparent to a selected band of wavelengths of light and can be mounted on a window. A projector projects an image of light of the wavelengths to which the display screen responds onto the screen to reflect or transmit the selected wavelengths of light from the screen. The screen is formed as a holographic optical element which reflects the light such that an observer is able to see the projected image from the display screen only if his eyes are within a predetermined area, while observers outside of the area see only a substantially transparent display screen on the window.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.