OLED STRESS HISTORY COMPENSATION ADJUSTED BASED ON INITIAL FLATFIELD COMPENSATION

1 . A method of compensating for degradation of pixels of a display panel including organic light emitting devices (OLED), said method comprising:

determining time zero calibration data for the pixels;

determining correction data with use of the time zero calibration data and storing the correction data in a memory of the display;

adjusting stress history corrected drive levels for the pixels with use of said correction data generating adjusted drive levels for the pixels; and

displaying images on the display with use of the adjusted drive levels.

2 . The method of claim 1 , wherein determining correction data with use of the time zero calibration data for the pixels comprises:

determining drive levels for the pixels which achieve, within determined tolerances, at least one of uniformity and target brightness; and

normalizing the drive levels generating normalized correction values.

3 . The method of claim 2 , wherein determining correction data further includes determining at least one of a horizontal one dimensional functional profile, a vertical one dimensional functional profile, and a two dimensional functional profile, corresponding to the normalized correction values, and wherein storing the correction data comprises storing functional parameters defining said determined at least one of a horizontal one dimensional functional profile, a vertical one dimensional functional profile, and a two dimensional functional profile.

4 . The method of claim 3 , wherein said at least one of a horizontal one dimensional functional profile, a vertical one dimensional functional profile, and a two dimensional functional profile, corresponding to the normalized drive levels comprises a best curve fit functional profile of the normalized correction values.

5 . The method of claim 3 , further comprising prior to adjusting the stress history corrected drive levels:

determining a stress history of the pixels of the display; and

correcting drive levels for the pixels of the display which correct for the stress history generating stress history corrected drive levels.

6 . The method of claim 5 , wherein adjusting stress history corrected drive levels comprises:

determining a correction factor from the correction data; and

multiplying the stress history corrected drive level by the correction factor.

7 . The method of claim 6 , wherein determining the time zero calibration data comprises driving the pixels of the display with a flat field and iteratively adjusting the drive levels for the pixels until they achieve, within said determined tolerances, said at least one of uniformity and target brightness.

8 . The method of claim 7 wherein determining the time zero calibration data further comprises while said adjusting the drive levels:

measuring the pixels to determine when they achieve, within said determined tolerances, said at least one of uniformity and target brightness.

9 . The method of claim 8 wherein said measuring comprises optically measuring the brightness of the pixels with use of optical sensing.

10 . A system for compensating for degradation of pixels of a display panel including organic light emitting devices (OLED), said system comprising:

the display panel;

optical correction processing and a controller adapted to:

determine time zero calibration data for the pixels;

determine correction data with use of the time zero calibration data and store the correction data in a memory of the display;

adjust stress history corrected drive levels for the pixels with use of said correction data generating adjusted drive levels for the pixels; and

control the display to display images on the display with use of the adjusted drive levels.

11 . The system of claim 10 , wherein determining correction data with use of the time zero calibration data for the pixels comprises:

determining drive levels for the pixels which achieve, within determined tolerances, at least one of uniformity and target brightness; and

normalizing the drive levels generating normalized correction values.

12 . The system of claim 11 , wherein determining correction data further includes determining at least one of a horizontal one dimensional functional profile, a vertical one dimensional functional profile, and a two dimensional functional profile, corresponding to the normalized correction values, and wherein storing the correction data comprises storing functional parameters defining said determined at least one of a horizontal one dimensional functional profile, a vertical one dimensional functional profile, and a two dimensional functional profile.

13 . The system of claim 12 , wherein said at least one of a horizontal one dimensional functional profile, a vertical one dimensional functional profile, and a two dimensional functional profile, corresponding to the normalized drive levels comprises a best curve fit functional profile of the normalized correction values.

14 . The system of claim 12 , wherein the optical correction processing and the controller are further adapted to prior to adjusting the stress history corrected drive levels:

determine a stress history of the pixels of the display; and

correct drive levels for the pixels of the display which correct for the stress history generating stress history corrected drive levels.

15 . The system of claim 14 , wherein adjusting stress history corrected drive levels comprises:

determining a correction factor from the correction data; and

multiplying the stress history corrected drive level by the correction factor.

16 . The system of claim 15 , wherein determining the time zero calibration data comprises driving the pixels of the display with a flat field and iteratively adjusting the drive levels for the pixels until they achieve, within said determined tolerances, said at least one of uniformity and target brightness.

17 . The system of claim 16 wherein determining the time zero calibration data further comprises while said adjusting the drive levels:

measuring the pixels to determine when they achieve, within said determined tolerances, said at least one of uniformity and target brightness.

18 . The system of claim 17 further comprising:

optical sensing;

wherein said measuring comprises optically measuring the brightness of the pixels with use of said optical sensing.