Transmissive and reflective liquid crystal display
US4315258A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1980 |
| Grant date | Feb 9, 1982 |
| Priority date | — |
| Expiry date | Feb 15, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/09
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A visual display has an increased readout capability due to its operation the transflective mode. A source of ambient light and light for radiation through the display from the backside together assure the increased readout capability. Heretofore, ambient light would degrade or washout a display making it nearly impossible for monitoring personnel to decipher alphanumeric or pictoral displays due to the decreased contrast. A pair of linear polarizers sandwich a twisted nematic liquid crystal and have their polarization axes either parallel or mutually orthogonally disposed so that the crystal will present bright or dark areas in response to applied potentials. Because a partially transmitting mirror is interposed between the sandwiched liquid crystal and the radiating light source, the ambient light augments the radiated light to enhance the visual display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.