Patent ID: 8481917

Claim:
A light sensitivity calibration system for an ambient light sensor (ALS) located on a printed circuit board (PCB), the system comprising: an adjustable resistor and a switch positioned on the PCB, the adjustable resistor and the switch connected between a calibration probe of the ALS and ground in series, wherein two pads of the PCB respectively connect to two ends of the adjustable resistor and the switch via PCB traces of the PCB; a test box, defining an opening and comprising a light source therein, wherein after turning off the switch, the PCB is fixed on the test box with the adjustable resistor and the ALS is positioned in the opening and faces the light source; a resistor, two ends of which respectively contact the two pads; and a visual controller, electrically connected to the PCB, to detect a light sensitivity of the ALS, and calculate and display a required resistance value of the adjustable resistor.