Optical sensor and electronic device

摘要

An object is sensed without a malfunction due to disturbance light. An optical sensor (101) of an aspect of the invention includes: a light-emitting element (LED) which turns off and turns on alternately for each one period; a light-receiving element (PD1) which receives reflection light and generates a photocurrent; and an integrating circuit (11) which integrates the photocurrent in a positive direction in a period during which the light-emitting element turns on and integrates the photocurrent in a negative direction in a period during which the light-emitting element turns off. A sum of lengths of integration periods in a first period and a last period is same as a length of another integration period.

主权项

1. An optical sensor, comprising:
a light-emitting element which turns off and turns on alternately for each of a plurality of continuous periods constituting a period group; a light-receiving element which receives light emitted from the light-emitting element and reflected by an object to be sensed and which generates a photocurrent; and an integrating circuit which integrates the photocurrent in a first polarity direction in a period during which the light-emitting element turns on and integrates the photocurrent in a second polarity direction opposite to the first polarity direction in a period during which the light-emitting element turns off, wherein a sum of a length of an integration period in a first period of the period group and a length of an integration period in a last period of the period group is same as a length of one integration period in a period other than the first period and the last period in the period group.