Patent ID: 7061477

Claim:
A projection display apparatus connected to a control device as a host through a serial interface, in which data is transmitted/received bi-directionally to display a picture on a display screen, said apparatus comprising: display means for receiving display data from said control device and projecting a picture represented by said display data onto said display screen; input/output means connected to the control device and adapted for generating display control signals controlling said display means, said input/output means being further connectable to at least one external peripheral equipment to input/output data pertaining to supplementary identification information appended to input data; and display control means for controlling a picture projected by said display means based on a display control signal input through said input/output means, wherein said display control means controls a picture projected by said display means based on said display control signal generated and output from said control device corresponding to said supplementary identification information appended to input data input through said input/output means to identify said projection apparatus.