Method and system for compensating for non-uniform color appearance of a display due to variations of primary colors
US6342897B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1999 |
| Grant date | Jan 29, 2002 |
| Priority date | — |
| Expiry date | Dec 16, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/68
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for compensating for the non-uniform color appearance of a color display is disclosed. Since there are variations of the chromaticity coordinates for each primary of every pixel in a display, the color appearance is not uniform. From the distribution of the chromaticity coordinates of the original primaries, we can choose a set of virtual primaries so that the chromaticity coordinates of each virtual primary can be produced by the original primaries in every pixel. The virtual primaries are used as the primaries of the display in stead of the original primaries. Because the chromaticity coordinates of the virtual primaries are the same for all pixels, the color appearance can be made to be uniform. This method is called the virtual primary method. LED displays are taken as an example to show this method. From the it condition where the tristimulus values of the LEDs, which are the original primaries, in a pixel are equal to those of the virtual primaries, we have the formulas converting RGB video signals into modified RGB video signals which are the input video signals of the LEDs. The systems implemented according to the formulas are able to compensate for the non-uniform…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.