US 12,339,161 B2
Ambient light sensing method and ambient light sensor
Yu-Min Lin, Hsinchu County (TW)
Assigned to SENSORTEK TECHNOLOGY CORP., Hsinchu County (TW)
Filed by SENSORTEK TECHNOLOGY CORP., Hsinchu County (TW)
Filed on Apr. 3, 2023, as Appl. No. 18/129,908.
Claims priority of provisional application 63/326,447, filed on Apr. 1, 2022.
Prior Publication US 2024/0019297 A1, Jan. 18, 2024
Int. Cl. G01J 1/42 (2006.01); G01J 1/04 (2006.01); G02B 5/20 (2006.01)
CPC G01J 1/4204 (2013.01) [G01J 1/0488 (2013.01); G02B 5/208 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An ambient light sensing method, comprising:
a light sensing device sensing the light passing through an optical filter and giving an optical signal value; and
an operational unit receiving said optical signal value and calculating an ambient light illuminance value according to said optical signal value;
where said optical filter is disposed to make a valid light-sensing wavelength range of said light sensing device include 450 nm to 690 nm and an invalid light-sensing wavelength range of said light sensing device be above 700 nm, wherein said valid light-sensing wavelength range refers to the wavelength range with the relative response intensity of said light sensing device greater than 40%; and said invalid light-sensing wavelength range refers to the wavelength range with the relative response intensity of said light sensing device less than 20%, wherein the relative response intensity of said light sensing device decreases progressively from 630 nm to 700 nm; and the slope of the line connecting the point with 90% relative response intensity and the one with 10% will be less than −0.01067.