Calibrated image-sensor-based ambient light sensor

摘要: An electronic device may be provided with an image sensor for capturing digital images. The used as part of image-sensor-based ambient light sensing circuitry producing readings. include a reference array. array formed from elements that are matched to in the but covered blocking material. Control can measure current flow into and use measurements these arrays calibrated reading. control make by measuring decay time associated voltage discharging capacitor. A comparator, pulse generator, switch periodically recharging capacitor adjusted ensure accurate