US Patent 7336176 Position indicating system

A position indicating system includes: a position indicating device, a first reference device, and a second reference device. The position indicating device includes: a first position indicating module for outputting a first signal; a second position indicating module for outputting a second signal; and a selecting module coupled to the first position indicating module and the second position indicating module for selectively driving the first position indicating module to output the first signal or driving the second position indicating module to output the second signal. The first reference device is corresponding to the first position indicating module for receiving the first signal and generating first position information according to a position of the position indicating device. And the second reference device is corresponding to the second position indicating module for receiving the second signal and generating second position information according to a position of the position indicating device.