US 12,217,668 B2
OLED-based display having pixel compensation and method
Seonki Kim, Fishkill, NY (US); Amalkumar P. Ghosh, Hopewell Junction, NY (US); Olivier Prache, Pleasantville, NY (US); and Hyuk Sang Kwon, Sunnyvale, CA (US)
Assigned to eMagin Corporation, Hopewell Junction, NY (US)
Filed by eMagin Corporation, Hopewell Junction, NY (US)
Filed on Feb. 12, 2024, as Appl. No. 18/439,023.
Application 18/439,023 is a continuation of application No. 17/830,912, filed on Jun. 2, 2022, granted, now 11,955,072.
Claims priority of provisional application 63/209,215, filed on Jun. 10, 2021.
Prior Publication US 2024/0346998 A1, Oct. 17, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G09G 3/3225 (2016.01)
CPC G09G 3/3225 (2013.01) [G09G 2320/0285 (2013.01); G09G 2320/029 (2013.01); G09G 2320/045 (2013.01); G09G 2360/145 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An organic light-emitting diode (OLED) display system having visual performance pixel compensation for loss of brightness, the OLED display system comprising:
(a) a plurality of display pixels, each display pixel comprising a plurality of OLED subpixels and pixel drive circuitry;
(b) a sensing system, the sensing system comprising a plurality of sensors and analog to digital conversion (ADC) circuitry operatively connected to each of the sensors, the ADC circuitry providing a sensor signal for each of the sensors;
(c) a processor to:
(i) provide an image data drive signal to each of the display pixels;
(ii) receive the sensor signal from the ADC circuitry for each sensor;
(iii) estimate a state of degradation of at least one of the display pixels by:
(A) determining a number (No) of non-degraded pixels required to turn on the sensing system, wherein the number of non-degraded pixels have a luminescence beyond a threshold luminescence sufficient to turn the sensing system on;
(B) setting a count value (i) to zero;
(C) generating a symbol S by energizing a number of degraded pixels equal to i;
(D) measuring a luminescence output of the sensing system to determine whether the sensing system is on;
(E) if the sensing system is not turned on at step (D) adding one to i, and re-generating S by energizing one additional degraded pixel; and
(F) if the sensing system turns on at step (E), determining a degradation level based on No and S;
(iv) determine a drive-signal compensation for each display pixel having an estimated state of degradation;
(v) compensate the image data drive signal to each display pixel having an estimated state of degradation based on the drive-signal compensation for each display signal having an estimated state of degradation.