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

Claim 10:
11. 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 a counting value of every square wave signal within a count period,
identify whether a frequency of the ambient light flicker is a first frequency or a second frequency when identifying that the counting value of every square wave signal is within two predetermined thresholds as well as a difference value between a maximum counting value and a minimum counting value among multiple counting values of all square wave signals within the count period is within a predetermined range, and
not identify whether the frequency of the ambient light flicker is the first frequency or the second frequency when identifying that not every square wave signal within the count period has the counting value within the two predetermined thresholds or the difference value between the maximum counting value and the minimum counting value among the multiple counting values exceeds the predetermined range.