Patent ID: 11946800
Assignee: PIXART IMAGING INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical sensor, comprising:
a photodiode, configured to detect ambient light flicker to generate a light signal;
a wave converter, configured to receive the light signal and to generate a square wave signal;
a pixel array, configured to acquire image frames according to frame ticks; and
a digital backend, configured to
count the square wave signal using a sampling frequency,
generate a trigger tick for adjusting the frame ticks according to a counting value of every square wave signal within a count period as well as consistency of multiple counting values of all square wave signals within the count period, and
compare the counting value of a last square wave signal in the count period with at least one count threshold to identify whether a frequency of the ambient light flicker is a first frequency or a second frequency when the trigger tick is generated.