Correction for localized phenomena in an image array

• US 10,186,190 B2
• Filed: 08/11/2017
• Issued: 01/22/2019
• 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:
  US15/675,297
• Publication Number:
  US 20170345364A1
• Time in Patent Office: 529 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 content data signals for the array of pixels using original aging compensation values to compensate for aging of the pixels in the array, said method comprising;

determining an effect of a localized phenomena on an effected pixel in the array of pixels based on a change in a parameter of the effected pixel;

adjusting the original aging compensation value as a function of the change in the parameter associated with the localized phenomena to reduce the effect of the localized phenomena on the effected pixel;

applying the adjusted aging compensation value to a content data signal for the effected pixel; and

applying one of the original aging compensation values to a content data signal for each pixel not effected by the localized phenomena.

2. The method of claim 1, wherein at least one of the pixels in the array of pixels is a reference pixel in proximity to the effected pixel, and

wherein determining the effect of the localized phenomena includes comparing the parameter of the reference pixel with the same parameter of the effected 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 effected pixel.

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

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 parameter at one point and the 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 changes that occur quickly between values of the parameter during different times.

10. 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;

adjust content data signals for the array of pixels using an aging compensation value for each pixel;

determine an effect of a localized phenomena on an effected pixel in the array of pixels based on a change in a parameter of the effected pixel;

adjust the aging compensation value as a function of the change in the parameter associated with the localized phenomena to reduce the effect of the localized phenomena on the effected pixel;

apply the adjusted aging compensation value to a content data signal to the effected pixel; and

applying one of the original aging compensation values to a content data signal for each pixel not effected by the localized phenomena.

11. The display device of claim 10, wherein at least one of the pixels is a reference pixel in proximity to the effected pixel, and

wherein the controller determines the effect of the localized phenomena by comparing the parameter of the reference pixel with the same parameter of the effected pixel.

12. The display device of claim 11, 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.

13. The display device of claim 12, wherein the first subpixel generates data content in place of the second subpixel.

14. The display device of claim 11, wherein the parameter of the reference pixel is interpolated for comparison with the same parameter of the effected pixel in proximity to the reference pixel.

15. The display device of claim 10, wherein at least one of the pixels includes a reference load, and wherein the controller determines the effect of the localized phenomena by comparing the parameter of the reference load with the same parameter of the effected pixel.

16. The display device of claim 15, 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.

17. The display device of claim 10, wherein the controller determines the effect of the localized phenomena by inputting the parameter at one point and the parameter at a second point in a model of current voltage characteristics to calculate the effect of the localized phenomena.

18. The display device of claim 10, wherein determining the effect of the localized phenomena includes filtering out changes that occur quickly between values of the measured parameter during different times.

19. The display device of claim 10, wherein the localized phenomena is selected from the group consisting of content displayed by the pixels from data content signals, and temperature.

20. The display device of claim 10, wherein the parameter is selected from the group consisting of mobility, threshold voltage, organic light emitting device (OLED) voltage, and OLED off-current.