Systems and methods for selecting a white point for image displays

• US 20050225561A1
• Filed: 04/09/2004
• Published: 10/13/2005
• Est. Priority Date: 04/09/2004
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Clairvoyante, Inc. (Samsung Group)
• Inventors: Higgins, Michael Francis, Brown Elliott, Candice Hellen
• Granted Patent: US 7,301,543 B2
• Time in Patent Office: Days
• US Class Current: 345/600
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607

Abstract

Several embodiments of the present application disclose techniques, systems and methods for changing or rendering input image data that may assume a first white point for a given display into image data to be rendered under a second—assumed, desired or measured—white point of the display.

Claims

1. A method for converting image data from a first white point of a display to a second white point, the steps of said method comprising:

solving for the weighting coefficients that relate the first white point coefficients and said second white point;

mapping color values utilizing said first white point, said color values derivable from said weighting coefficients, into another set of color values;

converting input image data into output image data in using said mapping.

2. The method of claim 1 wherein said first white point is an assumed white point of said display.

3. The method of claim 1 wherein said first white point is a measured tri-stimulus white point of said display.

4. The method of claim 1 wherein said second white point is a desired white point of said display.

5. The method of claim 1 wherein said second white point is the white point with only white subpixels turned on.

6. The method of claim 1 wherein said method further comprises the step of dynamically changing the weighting coefficients according to user preference.

7. A method for changing the chromaticity triangle calculations for input image data, the steps of said method comprising:

converting input image data to a first color space, said first color space having substantially the same white point as the display;

calculating the chromaticity triangle of the converted input image data.

8. The method of claim 7 wherein said input image data is in sRGB format.

9. The method of claim 8 wherein said sRGB input values are converted into values that have substantially the same white point as the display.

10. The method of claim 9 wherein said converted values have their chromaticity triangles calculated.

11. A method of calculating chromaticity triangles of input image data, the steps of said method comprising:

constructing a plurality of Boolean tests to determine the chromaticity triangle of any input image data;

applying a correction for said Boolean tests depending upon the desired white point of the display.