Correction for localized phenomena in an image array

• US 9,761,170 B2
• Filed: 12/05/2014
• Issued: 09/12/2017
• Est. Priority Date: 12/06/2013
• Status: Active Grant

• Current Assignee: IGNIS Innovation Incorporated
• Original Assignee: IGNIS Innovation Incorporated
• Inventors: Chaji, Gholamreza, Torbatian, Mehdi
• Primary Examiner(s): Merkoulova, Olga
• Application Number:
  US14/561,697
• Publication Number:
  US 20150161942A1
• Time in Patent Office: 1,012 Days
• CPC Class Codes: G09G 2300/0413 Details of dummy pixels or dummy lines in flat panels
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/029 by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3225 using an active matrix

Abstract

A method and system of compensating for localized phenomena in a display is disclosed. The display includes an array of pixels and a control system for adjusting content data signals for the array of pixels to compensate for aging of the pixels in the array. The control system measures a parameter of at least one of the pixels in the array via a read input of the at least one of the pixels. The controller determines the effect of the localized phenomena on the pixel using the parameter. A characteristic is measured for at least one of the pixels in the array via the read input of the at least one of the pixels. The measured characteristic is adjusted to reduce the effect of the localized phenomena. An adjusted aging compensation value based on the adjusted measured characteristic is calculated by the controller. The aging compensation value is applied to a data content signal to at least one of the pixels.

Claims

1. A method of compensating for localized phenomena in a display device including an array of pixels and a controller for adjusting data content signals for the array of pixels to compensate for aging of the pixels in the array, said method comprising;

measuring a parameter of at least one of the pixels in the array, the at least one of the pixels being one of a subset of pixels of the pixels of the array affected by a localized phenomena, the parameter associated with the localized phenomena, wherein the localized phenomena does not affect the pixels in the array other than the subset of pixels;

determining the effect of the localized phenomena using the parameter;

measuring a characteristic associated with the aging of the pixels in the array for at least one of the pixels in the array;

adjusting the measured characteristic as a function of the measured parameter associated with the localized phenomena to reduce the effect of the localized phenomena;

calculating an adjusted aging compensation value based on the adjusted measured characteristic; and

applying the adjusted aging compensation value to a data content signal to at least one of the pixels in the subset of pixels affected by the localized phenomena.

2. The method of claim 1, wherein at least one of the pixels is a reference pixel, and wherein determining the effect of the localized phenomena includes comparing the measured parameter of the reference pixel with the same measured parameter of at least one pixel in proximity to the reference pixel.

3. The method of claim 2, wherein the reference pixel includes a first subpixel that accepts a data content signal, and a second subpixel that is not coupled to a data content signal, wherein the parameter of the reference pixel is measured from the second subpixel.

4. The method of claim 3, wherein the first subpixel generates data content in place of the second subpixel.

5. The method of claim 2, wherein the parameter of the reference pixel is interpolated for comparison with the same measured parameter of the at least one pixel in proximity to the reference pixel.

6. The method of claim 1, wherein the at least one of the pixels includes a reference load, and wherein determining the effect of the localized phenomena includes comparing the measured parameter of the reference load with the same parameter of the at least one of the pixels.

7. The method of claim 6, wherein the measured parameter of the reference load is interpolated for the comparison of the same parameter for a second pixel in proximity to the pixel including the reference load.

8. The method of claim 1, wherein determining the effect of the localized phenomena includes inputting the measured parameter at one point and the measured parameter at a second point in a model of the current voltage characteristics to calculate the effect of the localized phenomena.

9. The method of claim 1, wherein determining the effect of the localized phenomena includes filtering out fast changes between values of the measured parameter during different times.

10. The method of claim 1, wherein the localized phenomena is content displayed by the pixels from data content signals.

11. The method of claim 1, wherein localized phenomena is temperature.

12. A display device comprising:

a display array including a plurality of pixels, the plurality of pixels each including a write input to write data content and a read input; and

a controller coupled to the display array, the controller operable to;

measure a parameter of at least one of the pixels in the array via the read input of the at least one of the pixels, the at least one of the pixels being one of a subset of pixels of the pixels of the array affected by a localized phenomena, the parameter associated with the localized phenomena, wherein the localized phenomena does not affect the pixels in the array other than the subset of pixels,

determine the effect of the localized phenomena on the pixel using the parameter;

measure a characteristic associated with the aging of the pixels in the array for at least one of the pixels in the array via the read input of the at least one of the pixels;

adjust the measured characteristic as a function of the measured parameter associated with the localized phenomena to reduce the effect of the localized phenomena;

calculate an adjusted aging compensation value based on the adjusted measured characteristic; and

applying the adjusted aging compensation value to a data content signal on the write input of at least one of the pixels in the subset of pixels affected by the localized phenomena.

13. The display device of claim 12, wherein at least one of the pixels is a reference pixel, and wherein the controller determines the effect of the localized phenomena by comparing the measured parameter of the reference pixel with the same measured parameter of at least one pixel in proximity to the reference pixel.

14. The display device of claim 13, wherein the reference pixel includes a first subpixel that accepts a data content signal, and a second subpixel that is not coupled to a data content signal, wherein the parameter of the reference pixel is measured from the second subpixel.

15. The display device of claim 14, wherein the first subpixel generates data content in place of the second subpixel.

16. The display device of claim 13, wherein the parameter of the reference pixel is interpolated for comparison with the same measured parameter of the at least one pixel in proximity to the reference pixel.

17. The display device of claim 12, wherein the at least one of the pixels includes a reference load, and wherein the controller determines the effect of the localized phenomena by comparing the measured parameter of the reference load with the same parameter of the at least one of the pixels.

18. The display device of claim 17, wherein the measured parameter of the reference load is interpolated for the comparison of the same parameter for a second pixel in proximity to the pixel including the reference load.

19. The display device of claim 12, wherein the controller determines the effect of the localized phenomena by inputting the measured parameter at one point and the measured parameter at a second point in a model of current voltage characteristics to calculate the effect of the localized phenomena.

20. The display device of claim 12, wherein determining the effect of the localized phenomena includes filtering out fast changes between values of the measured parameter during different times.

21. The display device of claim 12, wherein the localized phenomena is content displayed by the pixels from data content signals.

22. The display device of claim 12, wherein localized phenomena is temperature.