Multi-mode power-efficient light and gesture sensing in image sensors
Various embodiments comprise apparatuses and methods including an image sensor. In one example, the image sensor includes a read-out integrated circuit, a plurality of pixel electrodes, an optically sensitive layer, and a top electrical contact. In a first low-power mode, electrical current passing through the top electrical contact is configured to be sensed, and independent currents passing through the plurality of pixel electrodes are configured not to be sensed independently. In a second high-resolution mode, independent currents passing through the plurality of pixel electrodes are configured to be sensed independently. Additional methods and apparatuses are described.
1. A method of regulating power distribution in a mobile device, the method comprising:
sensing, in a low-power mode, information regarding illumination of a sensor in the mobile device by measuring a photocurrent through at least one electrode disposed on or above an image sensor integrated circuit;
providing the sensed information to a controller circuit;
determining, using the controller circuit, a rate of change in at least one of space and time of the conditions illuminating the sensor; and
providing an output from the controller circuit to implement a power-up of a component within the mobile device.