Patent ID: 8487891

Claim:
A pointer detection apparatus, comprising: a conductor pattern including a plurality of first conductors disposed in a first direction and a plurality of second conductors disposed in a second direction which crosses the first direction; a multi-frequency signal production circuit configured to produce a plurality of signals of different frequencies; a phase controlling circuit configured to control initial phases of the plurality of signals of different frequencies produced by the multi-frequency signal production circuit, wherein the controlling of the initial phases comprises supplying, to two of the first conductors, signals having the initial phases that differ by substantially 180 degrees so as to suppress a peak level of a combined signal appearing at one of the second conductors; a first conductor selection circuit configured to selectively supply said signals of different frequencies produced by said multi-frequency signal production circuit to those first conductors, between which N number of the first conductors are interposed, N being an integer equal to or greater than 0; a second conductor selection circuit configured to selectively receive detection signals from the plurality of second conductors; and a signal detection circuit configured to detect signals of individual frequencies, corresponding to the signals of different frequencies produced by said multi-frequency signal production circuit, which are representative of coupling states at cross points between the first conductors and the second conductors, and are received from said second conductor selection circuit.