Liquid crystal light emitting display system
US4838661A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1988 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Jan 5, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/66
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A liquid crystal light emitting display (LCLED) device having two modes of operation. In the first mode the LCLED device produces dark symbols on a light background. In the second mode the LCLED device emits light producing light symbols on a dark background. The LCLED includes a LCD cell having an optically active nematic liquid crystal composition interposed between two parallel glass substrates. The glass substrates having transparent electrode indicia on the inner surfaces. Disposed on the outer surfaces of the glass substrates are polarizers having their axes of polarization orthogonal in the first mode, and their axes of polarization parallel in the second mode. A transparent panel having indicia identical to the electrode indicia is disposed on the exterior of one of the polarizers. The transparent panel is comprised of transparent material having fluorescent dye stuff. The transparent panel is optically connected to a light collecting means. In the second mode, the light collecting means absorbs light from an illumination means and internally reflects the light to the transparent panel indicia. The transparent panel indicia is comprised of a plurality of depressions which i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.