Apparatus and method for temperature compensation of liquid crystal matrix displays
US5088806A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1990 |
| Grant date | Feb 18, 1992 |
| Priority date | — |
| Expiry date | Jan 16, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/041
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a liquid crystal display, the optical transmission of the liquid crystal medium as a function of applied electric field varies with temperature. In order to ensure that the temperature of the liquid crystal medium can provide a practical response time, a heating element, along with a sensor element and a thermostat, establishes the temperature of the liquid crystal display in an appropriate range. The output signal of the sensor element is digitized and is used as a first portion of a memory unit address. A second portion of the memory unit address is provided by digitized command signals either from an operator or from the processing apparatus controlling the image of liquid crystal display. The logic signals stored at the location determined by the first and second address portions identify an electric field (applied voltage) that provides compensation for temperature and compensation for non-linear characteristics of the liquid crystal medium. The logic signals from the memory unit are converted into a voltage to be applied to the liquid crystal display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.