	US 7,576,750 B2
	Method and arrangement for optimizing a luminance characteristic curve
Wolfgang Eckhardt, Karlsruhe (Germany); Andreas Kaercher, Weingarten (Germany); Uwe Nagel, Karlsruhe (Germany); and Hartmut Schulz, Rheinstetten (Germany)
Assigned to EIZO GmbH, Karlsruhe (Germany)
Filed on Aug. 23, 2004, as Appl. No. 10/922,976.
Claims priority of application No. 103 38 484 (DE), filed on Aug. 21, 2003.
Prior Publication US 2006/0038807 A1, Feb. 23, 2006
Int. Cl. G09G 5/02 (2006.01)

U.S. Cl. 345—601 [345/589; 345/690; 382/167; 382/274]

10 Claims

1. A method for adjusting a luminance characteristic curve for a display system comprising:

storing desired luminance characteristic values corresponding to a desired luminance characteristic curve in a lookup table;

storing natural response luminance values in said lookup table corresponding to a luminance response of said display system to test images without an influence of ambient light;

detecting ambient light illumination of said display system during normal operation with a brightness sensor;

adjusting a range of luminances output by said display system based on the detected ambient light illumination;

scaling said stored natural response luminance values to correspond to said adjusted range of luminances output by said display system;

storing video input levels corresponding to a video signal in said lookup table;

calculating adjusted video output levels which correspond, respectively, to said video input levels; and

supplying said adjusted video output levels to said display system;

wherein said adjusted video output levels are calculated by a calculation procedure comprising:

determining an adjusted luminance level of said display system for each video input level based on said stored desired luminance characteristic values; and

calculating a corresponding adjusted video output level necessary to achieve said adjusted luminance level based on said stored natural response luminance values.