Pointer detection apparatus and pointer detection method
First Claim
1. 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.
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Accused Products
Abstract
Disclosed herein is a pointer detection apparatus, including: 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; a multi-frequency signal production circuit configured to produce a plurality of signals of different frequencies; a first conductor selection circuit configured to selectively supply the signals of different frequencies to those first conductors, between which N ones of the first conductors are interposed, N being a predetermined integer equal to or greater than 0; a second conductor selection circuit configured to selectively receive detection signals from the second conductors; and a signal detection circuit configured to obtain signals of individual frequencies, corresponding to the signals of different frequencies produced by the 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.
66 Citations
23 Claims
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1. A pointer detection apparatus, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 22, 23)
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19. A pointer detection method, comprising:
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a first step of producing a plurality of signals of different frequencies; a second step of selectively supplying the signals of different frequencies produced at the first step to those conductors, among 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 crossing the first direction, those conductors to which the signals of different frequencies are supplied being the first conductors and between which N number of the first conductors being interposed, N being a predetermined integer equal to or greater than 0; the second step including controlling initial phases of the signals of different frequencies produced at the first step to supply, 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 third step of selectively switching those second conductors from which detection signals are received; and a fourth step of detecting signals of individual frequencies corresponding to the signals of the different frequencies supplied at the second step, based on the detection signals supplied from the second conductors selected at the third step, wherein the signals of individual frequencies are representative of coupling states at cross points between the first conductors and the second conductors. - View Dependent Claims (20, 21)
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Specification