OLED-based display having pixel compensation and method

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.