Display device and method capable of prompting VGA signal source states

The invention provides a display device capable of prompting VGA signal source states. The display device capable of prompting the VGA signal source states comprises a main control module, a signal source front end module and a display module. The signal source front end module is used for setting an invalid identity value when received input signals do not include VGA input signals, the main control module is used for reading the invalid identity value and generating a first instruction which prompts the fact that no VGA signal is included, and the display module is used for displaying prompting information that no VGA signal is included according to the first instruction. The display device capable of prompting the VGA signal source states can accurately prompt VGA signal source state information and solve the problem that the information that no VGA signal is included cannot be prompted in the prior art.