Method for maintaining the white colour point in a field-sequential LCD over time
US7714829B2 · kind B2 · utility
1Cited by
14References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 5, 2004 |
| Grant date | May 11, 2010 |
| Priority date | — |
| Expiry date | Oct 23, 2026 |
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 colour point through compensation values to at least one colour 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 colours. Brightness levels may also be factored in.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.