Method for maintaining the white colour point in a field-sequential LCD over time
US8421827B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 2010 |
| Grant date | Apr 16, 2013 |
| Priority date | — |
| Expiry date | Apr 20, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0666
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A field sequential liquid crystal display maintains its white color point through compensation values to at least one color light emitting diode that illuminates the display. The compensation values may be impedances to control the current or pulsing of the current source according to a pulse width modulation technique. A degradation curve may be used to calculate extrapolate the theoretical forward voltage of the light emitting diode. Additional complexity arises from the need for calculating uptime for multiple light emitting diodes of different colors. Brightness levels may also be factored in. Additional processing of a display element may be provided when a grey scale image is being generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.