Method for authenticating mobile device and display apparatus, and mobile device authentication system

PURPOSE: A mobile device authentication method, a display device applying the same, and a mobile device authentication system are provided to authenticate a mobile device by displaying a generated code image on a screen. CONSTITUTION: A mobile device recognition unit(110) senses a mobile device. A code image forming unit(120) generates a code image for encoding display device information if the mobile device is sensed through the mobile device recognition unit. A display unit(130) displays the generated code image. A communication unit(140) receives mobile device information through the code image. An authentication unit(150) authenticates the mobile device through mobile device information.