Patent ID: 6943753

Claim:
An input channel switching control device for a display monitor having a DDC function which comprises a DVI-I interface supporting respective video signals of analog specification and digital specification inputted from an external computer, comprising: a discriminator that judges whether each of said video signals inputted from said external computer is a signal of analog specification or digital specification and also judges whether the state of an input channel is an analog channel or a digital channel; an EDID data memory that stores EDID data of analog specification and EDID data of digital specification; an input channel switch that switches the state of said input channel into a channel of the specification of said video signal which is judged by said discriminator; and a DDC control that reads and transmits to said external computer said EDID data of the specification corresponding to the state of said input channel which is judged by said discriminator out from said EDID data memory on the basis of a DDC transmission request from said external computer, wherein said input channel switch switches the state of said input channel after said DDC control transmits said EDID data to said external computer.