A display device includes a USB Type-C connector module, an audio/video signal switching unit, a processing unit, and a display unit. The USB Type-C connector module includes a USB Type-C connector, a configuration channel logic IC, and a channel switching multiplexer. The processing unit selectively reads a channel setting state from one of the configuration channel logic IC and the channel switching multiplexer and determines whether the channel setting state includes an audio/video channel. When the processing unit determines that the channel setting state includes the audio/video channel, the processing unit controls the audio/video switching unit to switch a signal source of the display unit to a signal source of the USB Type-C connector module.