| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an instruction to return to a normal operation mode when a person approaches a touch panel by sensing the approach of the person even in a standby state in which almost all functions of an electronic apparatus are at rest.SOLUTION: A detection circuit includes: a driving circuit that applies a predetermined potential to a first electrode of a sensor; a differential amplifier that has an inverted input terminal which is connected to a second electrode of the sensor, and outputs a detection signal; a first switch that is connected between an output terminal and inverted input terminal of the differential amplifier; a second switch that switches a capacitance value of the capacitor between the output terminal and inverted input terminal of the differential amplifier; and a control unit that controls the first switch so as to periodically cause short-circuiting between the output terminal and inverted input terminal of the differential amplifier, also controls the second switch in a standby state so as to make the capacitance value of the capacitor smaller than that in a normal operation mode, and controls transition to a normal operation mode on the basis of the detection signal.</p> |
