Multilayered display having two displays in series and a switchable optical retarder
US5583674A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 28, 1996 |
| Grant date | Dec 10, 1996 |
| Priority date | — |
| Expiry date | Feb 28, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/62
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A display arrangement comprises an image intensifier tube or some other device which provides a representation of a viewed scene at an input. A supertwist LCD and associated polarizers and are located between the input and a viewer. A ferroelectric liquid crystal shutter is located between the LCD and second polarizer and is controlled to produce symbology. By switching the shutter the polarization of the incident radiation is switched between two states differing by 90.degree.. This causes the LCD to operate in two states. In one state the viewed scene is transmitted through the LCD and in the other state it is absorbed and any symbology on the LCD is contrasted with a dark absorbing background. The shutter is switched sufficiently quickly that the viewer perceives the symbology overlaid on the viewed scene. In another arrangement, lens means having focusing properties which are dependent on the incident polarization is included to allow switching between different display modes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.