Apparatus and method of controlling driving voltage for image display device
US6879311B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 2002 |
| Grant date | Apr 12, 2005 |
| Priority date | — |
| Expiry date | Aug 8, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/066
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus and method for controlling a driving voltage for an image display device, in which an optical sensor is installed between a liquid crystal display device and a screen or between the liquid crystal display device and a projection lens, and the driving voltage for the liquid crystal display device is feedback controlled using the output signal of the optical sensor in order to provide an optimal contrast. In this apparatus and method, the edge area of an image display device is subject to a minute change in the amplitude of a driving voltage, and the optical change is sensed and used to control the driving voltage of the image display device. Accordingly, regardless of property changes due to the temperature of an image display device and its peripheral devices, a picture can be displayed with an optimal contrast and blinking due to flickering can be minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.