US 12,087,250 B2
Ambient light sensing systems
Bernhard Greimel-Laengauer, Hofstätten an der Raab (AT)
Assigned to AMS AG, Premstätten (AT)
Appl. No. 17/781,537
Filed by ams AG, Premstätten (AT)
PCT Filed Dec. 2, 2020, PCT No. PCT/EP2020/084266
§ 371(c)(1), (2) Date Jun. 1, 2022,
PCT Pub. No. WO2021/110745, PCT Pub. Date Jun. 10, 2021.
Claims priority of provisional application 62/943,648, filed on Dec. 4, 2019.
Claims priority of application No. 2010825 (GB), filed on Jul. 14, 2020.
Prior Publication US 2022/0301519 A1, Sep. 22, 2022
Int. Cl. G09G 5/10 (2006.01); G09G 3/20 (2006.01)
CPC G09G 5/10 (2013.01) [G09G 3/2092 (2013.01); G09G 2320/0626 (2013.01); G09G 2360/144 (2013.01); G09G 2360/145 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of sensing a level of ambient light in an electronic device having an emissive display and a sensor, comprising:
sensing, using the sensor, a combined light level of ambient light and light from the emissive display;
integrating the combined light level over an ambient light sensing time to determine an integrated combined light level, wherein the integrated combined light level comprises an average combined light level over the ambient light sensing time;
determining an integrated display light level over the ambient light sensing time for the emissive display; and
compensating the integrated combined light level using the integrated display light level to determine a calculated ambient light level, wherein the compensating comprises determining a difference between the integrated combined light level and the integrated display light level;
wherein the electronic device controls a display brightness of the emissive display by modulating the emissive display between first and second brightness levels; and
wherein determining the integrated display light level comprises:
sensing, using the sensor, a combination of light from the emissive display when at the first brightness level and the light level of the ambient light to determine a first sensed brightness level, and a combination of light from the emissive display when at the second brightness level and the light level of the ambient light to determine a second sensed brightness level;
determining a difference between the first and second sensed brightness levels to suppress a contribution from the light level of ambient light; and
applying a calibration value to the difference to determine the integrated display light level.