CPC H01L 27/14609 (2013.01) [H04N 13/271 (2018.05)] | 17 Claims |
1. A pixel circuit for background light suppression, the pixel circuit comprising:
a 2-tap pixel circuit including first and second pixel capacitors, first and second storage switches, and first and second transfer switches;
an in-pixel sigma delta circuit including a plurality of switching switches and a storage capacitor for storing charge transferred from the first and second pixel capacitors;
an adaptive sigma delta controller configured to determine switching states of the plurality of switching switches according to a first state of the first pixel capacitor, or a second state of the second pixel capacitor, or both; and
a chopping controller configured to instruct the storage switches and the transfer switches of the 2-tap pixel circuit to be selectively switched according to an output of the adaptive sigma delta controller.
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