Electronic apparatus and display apparatus, and method for operating apparatuses

An electronic apparatus, comprising:

• an interface unit configured to process at least one of a video signal or an audio signal while being operable in association with a display apparatus;
• an inverter configured to operate at an operating frequency determined in accordance with a distance from the display apparatus and change a DC voltage input from an outside into an AC voltage;
• and
• a coil unit configured to generate an inductive electromotive force in the display apparatus by using the AC voltage.

A method for driving a display apparatus, comprising:

• generating a voltage by using an inductive electromotive force generated by an external apparatus;
• rectifying an output voltage of a resonance circuit unit;
• and
• varying a frequency and a duty of a receiver-converter based on a target voltage and duty data of an inverter determined in accordance with a distance from the external apparatus and outputting the rectified output voltage of a rectifier as the target voltage.