Liquid crystal display device which compensates for temperature characteristics in light detection and spectral transmittance
US8363001B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2006 |
| Grant date | Jan 29, 2013 |
| Priority date | — |
| Expiry date | Oct 19, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/041
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a liquid crystal display device capable of shortening the time required for stabilizing the brightness and the chromaticity to the temperature change. The input of an LED driver is connected to the output of a PWM controller, so that the electric power supplied to the respective LED groups of red, green and blue are controlled with a PWM method. A feedback control means for controlling the PWM controller includes a brightness setting means, a color setting means, a multiplication means for receiving the outputs from the brightness setting means and the color setting means, a comparison means fed with the output of the multiplication means at one of the inputs thereof, a light sensor temperature compensation means for compensating for fluctuations of the output of the light detection means due to temperature changes, a liquid crystal display panel temperature compensation means for compensating for fluctuations of the spectral transmittance of the liquid crystal display panel due to temperature changes, an addition means for summing the result of detection by the light detection means and the output of the light sensor temperature compensation means, a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.