Disclosed is a display device and a method for implementing an incoming notification function with respect to an MHL signal source. The display device includes: a control module, configured to control, when the display device is in a non MHL signal source pattern, a first MHL interface transfer switch, disposed between a signal decoding processor and an MHL signal source interface of the display device, to be on, and configured to start a background monitoring module electrically connected to the first MHL interface transfer switch, and further configured to display, if an MHL signal source is monitored to be connected, incoming reminder information according to a pre-configured incoming notification information or switch a current signal source pattern of the display device to be the MHL signal source pattern; and the background monitoring module, configured to monitor whether the MHL signal source is connected.