Patent ID: 8502778

Claim:
A dual-mode input device adapted for use with a computer, said dual-mode input device comprising: a casing; a relative coordinate generator disposed in said casing, for detecting motion of said casing, and generating relative coordinate information based on detected motion of said casing; a processing unit disposed in said casing, and coupled electrically to said relative coordinate generator, said processing unit including a coordinate storing module for storing absolute coordinate information, an absolute coordinate generator for receiving the relative coordinate information from said relative coordinate generator and the absolute coordinate information from said coordinate storing module, generating updated absolute coordinate information based on the relative coordinate information and the absolute coordinate information, and storing the updated absolute coordinate information in said coordinate storing module, and an output selecting module for receiving the relative coordinate information from said relative coordinate generator and the absolute coordinate information from said coordinate storing module, said output selecting module being operable in a selected one of a relative coordinate mode, in which said output selecting module outputs the relative coordinate information, and an absolute coordinate mode, in which said output selecting module outputs the absolute coordinate information; and a transmission interface coupled electrically to said processing unit and operable to transmit the output of said output selecting module to the computer; wherein said processing unit receives screen resolution information from the computer via said transmission interface and further includes a coordinate setting module for generating and storing initial absolute coordinate information corresponding to the screen resolution information in said coordinate storing module.