ILLUMINANCE SENSOR, AND ELECTRONIC APPARATUS AND SEMICONDUCTOR DEVICE USING THE ILLUMINANCE SENSOR

摘要

Provided is an illuminance sensor wherein a photoelectric converter (1) includes three optical sensors (PS), and each of the optical sensors (PS) outputs the current of the difference between the photocurrents generated by two optical diodes (PDA, PDB) having different light receiving characteristics. The ratios between the light receiving areas of the two optical diodes (PDA, PDB) in the respective three optical sensors (PS) are different from each other, and the sum of the positive currents among the output currents from the three optical sensors (PS) is fixed with respect to a fixed illuminance, irrespective of the type of the light source. An arithmetic and control unit (7) obtains illuminance, based on the sum of the positive currents out of the output currents from the three optical sensors (PS).