Display burn-in compensation

A display system, comprising:

• a display including light-emitting pixels;
• a sensor arranged behind the display to receive light transmitted by the light-emitting pixels of the display;
• and
• a controller module in electrical communication with the display, the controller module being programmed to:
• drive the display with driving voltage signals that are compensated according to a burn-in model that represents predicted pixel degradation over time;
• determine a luminance of light received by the sensor during an emission-on period during which a subset of the light-emitting pixels in front of the sensor emit light, wherein during the emission-on period, the subset of the light emitting pixels in front of the sensor emit light according to programmed display brightness values;
• determine a luminance of light received by the sensor during an emission-off period during which the subset of the light-emitting pixels in front of the sensor emit no light;
• calculate, by comparing the luminance of the light received by the sensor during the emission-on period to the luminance of the light received by the sensor during the emission-off period, a luminance of light internally reflected from the subset of the light-emitting pixels and received by the sensor during the emission-on period;
• calculate, using the programmed display brightness values, a reference luminance comprising an expected luminance of light internally reflected from the subset of the light-emitting pixels and received by the sensor when the subset of the light-emitting pixels emit light according to the programmed display brightness values;
• determine that a difference between the luminance of light internally reflected from the subset of the light-emitting pixels and a reference luminance equals or exceeds a threshold difference;
• in response to determining that the difference between the luminance of light internally reflected from the subset of the light-emitting pixels and the reference luminance equals or exceeds a threshold difference, adjust the burn-in model by a correction factor to obtain an adjusted burn-in model;
• and
• driving the display with adjusted driving voltage signals that are compensated according to the adjusted burn-in model.

A non-transitory computer-readable medium containing instructions which when executed on a data processing apparatus in communication with a display drives the display, the display comprising light-emitting pixels, a sensor being arranged behind the display to receive light transmitted by the light-emitting pixels of the display, wherein execution of the instructions by the data processing apparatus causes performance of operations comprising:

• driving the display with driving voltage signals that are compensated according to a burn-in model that represents predicted pixel degradation over time;
• determining a luminance of light received by the sensor during an emission-on period during which a subset of the light-emitting pixels in front of the sensor emit light, wherein during the emission-on period, the subset of the light emitting pixels in front of the sensor emit light according to programmed display brightness values;
• determining a luminance of light received by the sensor during an emission-off period during which the subset of the light-emitting pixels in front of the sensor emit no light;
• calculating, by comparing the luminance of the light received by the sensor during the emission-on period to the luminance of the light received by the sensor during the emission-off period, a luminance of light internally reflected from the subset of the light-emitting pixels and received by the sensor during the emission-on period;
• calculating, using the programmed display brightness values, a reference luminance comprising an expected luminance of light internally reflected from the subset of the light-emitting pixels and received by the sensor when the subset of the light-emitting pixels emit light according to the programmed display brightness values;
• determining that a difference between the luminance of light internally reflected from the subset of the light-emitting pixels and a reference luminance equals or exceeds a threshold difference;
• in response to determining that the difference between the luminance of light internally reflected from the subset of the light-emitting pixels and the reference luminance equals or exceeds a threshold difference, adjust the burn-in model by a correction factor to obtain an adjusted burn-in model;
• and
• driving the display with adjusted driving voltage signals that are compensated according to the adjusted burn-in model.