Optical sensor and method of correcting same

An optical sensor comprising:

• a plurality of light receiving portions which include:
• a RGB light receiving portion formed with a green light receiving portion, a red light receiving portion and a blue light receiving portion;
• and an other light receiving portion having a spectral sensitivity characteristic different from a spectral sensitivity characteristic of the RGB light receiving portion;
• a plurality of analog-to-digital converters which convert photocurrents generated in the light receiving portions into digital values;
• and
• a switch which is coupled to a signal path between the light receiving portions and the analog-to-digital converters,
• wherein the switch switches between a first step of applying the photocurrents generated in the RGB light receiving portion to the analog-to-digital converters and a second step of applying the photocurrent generated in at least one computation reference light receiving portion selected from the RGB light receiving portion and the photocurrent generated in the other light receiving portion to the analog-to-digital converters, and
• the optical sensor calculates the photocurrent generated in the other light receiving portion in the first step from a ratio between the photocurrents of the computation reference light receiving portion selected both in the first step and the second step.