Patent ID: 7777811

Claim:
A display apparatus connectable with one or more other display apparatuses and including a display device for displaying an image, comprising: an input device to input video signal output from one of the other display apparatuses; an image enlarging device to generate, from the input video signal, an enlarged image of the image corresponding to the input video signal; an authentication device to perform mutual authentication with said one of the other display apparatuses; and a display control device to, if the authentication has been successfully passed, display an enlarged image generated by the image enlarging device on the display device such that images displayed on the displayed apparatus and the one or more other display apparatuses form, as a whole, a complete enlarged image and, if the authentication has not been successfully passed, to set the display device to a single operation mode, wherein mutual authentication includes determination by the display device which of the one or more other display devices is operable as a master device or slave device and is a scalable device.