Liquid crystal integrated circuit display including as arrangement for maintaining the liquid crystal at a controlled temperature
US5694147A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1995 |
| Grant date | Dec 2, 1997 |
| Priority date | — |
| Expiry date | Apr 14, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/041
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An active matrix liquid crystal display includes an arrangement for maintaining the liquid crystal material of the display at a controlled temperature above ambient temperature. The liquid crystal material of the display is disposed over a substrate containing integrated circuitry. The arrangement for maintaining the temperature of the liquid crystal includes (i) an arrangement for heating the liquid crystal material sufficient to maintain the liquid crystal material at the controlled temperature, (ii) an arrangement for sensing the temperature at a location in close proximity to the liquid crystal material and producing an output signal representative of the temperature, and (iii) a servo-circuit responsive to the output signal for causing the heating arrangement to maintain the liquid crystal material at the controlled temperature. In accordance with the present invention, at least some of the elements making up the arrangement for heating the liquid crystal, the arrangement for sensing the temperature, or the servo-circuitry are formed as part of the integrated circuitry contained within the substrate which the liquid crystal is disposed over. In one preferred embodiment of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.