Dynamic correction of LCD gamma curve
US6256010A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1997 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Jun 30, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/0276
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and means for correcting the .gamma. - curve of an LCD by calculating an inverse .gamma. - curve from the .gamma. - curve of the LCD measured by the manufacturer and producing a straight line V-T plot from the combination, a set of corrected voltages selected from the inverse .gamma. - curve is provided for the different positions or viewing angles of the display, thus improving the .gamma. - curve correction efficiency at different viewing angles of the LCD. In one embodiment, a timing control ASIC, that produces the horizontal scan and vertical scan signals of the display, is used to time the outputting of sets of .gamma. - curve correction voltage signals stored in high speed memories for application, after digital to analog conversion, to the horizontal scan lines of the LCD to be corrected. The ASIC also provides a set of latch enable signals to a set of data latches, which receive the correction voltage signals as input signals from the memories, and provide the corrected voltage outputs, through a set of digital to analog converters (DACs) to a number of output lines connected to the LCD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.