US 12,307,981 B2
Micro-OLED sub-pixel uniformity compensation architecture for foveated displays
Shereef Shehata, San Ramon, CA (US); and Jim C Chou, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Jun. 2, 2023, as Appl. No. 18/328,329.
Prior Publication US 2024/0404479 A1, Dec. 5, 2024
Int. Cl. G09G 3/20 (2006.01); G09G 3/3208 (2016.01); G09G 3/3291 (2016.01)
CPC G09G 3/3291 (2013.01) [G09G 2310/027 (2013.01); G09G 2320/0233 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electronic device, comprising:
a display panel comprising a plurality of display pixels;
an image source configured to provide image data; and
image processing circuitry configured to:
receive a brightness level of the display panel;
receive the image data configured to be displayed by the plurality of display pixels, wherein the image data comprises gray level data for a first display pixel of the plurality of display pixels;
convert the gray level data to voltage data based on the brightness level;
determine a compensation for the voltage data based on a global voltage compensation value and a local voltage compensation value, wherein the global voltage compensation value is configured to compensate for non-uniformities occurring at a first spatial frequency and the local voltage compensation value is configured to compensate for non-uniformities occurring at a second spatial frequency, and wherein the second spatial frequency is greater than the first spatial frequency;
apply the compensation to the voltage data to generate compensated voltage data; and
convert the compensated voltage data into compensated gray level data for the first display pixel, wherein converting the compensated voltage data comprises compressing a voltage domain range of the compensated voltage data.