| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a technique that ensures the signal dignity of an AC/DC signal even when an AC signal and a DC signal are transmitted using a terminal for the AC signal at which an AC coupling circuit is disposed in connecting an external device and a display device.SOLUTION: In an AC mode, a control unit 20 turns on a switch 53 for an audio signal that is disposed in an AC signal path (an AC path LA), and turns off a switch 51 for a control output and a switch 52 for a control input that are disposed in DC signal paths (an input-side DC path LD_IN and an output-side DC path LD_OUT). In a DC mode, since an audio signal is not acquired, the control unit 20 turns off the switch 53 for an audio signal and turns on the switch 51 for a control output and the switch 52 for a control input.</p> |
