US 12,148,367 B2
Burn-in compensation for display
Hyunchul Kim, Mountain View, CA (US); Sun-il Chang, San Jose, CA (US); and Wonjae Choi, Mountain View, CA (US)
Assigned to Google LLC, Mountain View, CA (US)
Appl. No. 17/596,047
Filed by Google LLC, Mountain View, CA (US)
PCT Filed Nov. 20, 2019, PCT No. PCT/US2019/062447
§ 371(c)(1), (2) Date Dec. 2, 2021,
PCT Pub. No. WO2021/101537, PCT Pub. Date May 27, 2021.
Prior Publication US 2022/0157234 A1, May 19, 2022
Int. Cl. G09G 3/3208 (2016.01)
CPC G09G 3/3208 (2013.01) [G09G 2320/046 (2013.01); G09G 2320/048 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A mobile computing device comprising:
an OLED display panel that includes a plurality of areas having different pixel densities, including a first area with a first pixel density and a second area with a second pixel density that is different from the first pixel density, each of the plurality of areas having a plurality of zones that each include one or more pixels;
a driver integrated circuit (IC) configured to, for each pixel in each of the plurality of areas, convert a digital count into a driving signal that causes the respective pixel to radiate light at a level corresponding to the digital count;
an applications processor configured by software instructions to reduce effects of a burn-in of pixels of the OLED display by:
estimating first area burn-in factors for the plurality of zones in the first area of the OLED display;
determining a first limiting burn-in factor from the estimated first area burn-in factors;
adjusting the estimated first area burn-in factors that are significantly different from the limiting first area burn-in factor;
updating, in a memory, the estimated first area burn-in factors for the plurality of zones in the first area to include the adjusted first area burn-in factors;
controlling the driver IC to adjust the driving signal for the plurality of pixels in each zone of the first area according to a corresponding updated first area burn-in factor to reduce the effects of burn-in of the first area of the OLED display;
estimating second area burn-in factors for the plurality of zones in the second area of the OLED display;
determining a second limiting burn-in factor from the estimated second area burn-in factors;
adjusting the estimated second area burn-in factors that are significantly different from the limiting second area burn-in factor;
updating, in a memory, the estimated second area burn-in factors for the plurality of zones in the second area to include the adjusted second area burn-in factors; and
controlling the driver IC to adjust the driving signal for the plurality of pixels in each zone of the second area according to a corresponding updated second area burn-in factor to reduce the effects of burn-in of the second area of the OLED display.