Patent ID: 9158418
Filing Date: 2015-10-13
Classification: G06F

Abstract:
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 and of a defined time length during which the plurality of signals are continuously supplied to drive the first conductors, and to produce, for at least one of the plurality of signals of different frequencies and of the defined time length, at least one inverted signal having the same frequency as, but having a phase inverted from that of, said at least one of the plurality of signals of different frequencies for the defined time length; a first conductor selection circuit configured to divide the plurality of first conductors into a plurality of groups, each group including Q number of the first conductors, Q being an even integer equal to or greater than 4, and the first conductor selection circuit being further configured to select one group among the plurality of groups, to divide the even number of the first conductors in the selected group into a first half and a second half each containing an equal number of the first conductors to each other, and to supply said at least one of the plurality of signals of different frequencies of the defined time length to the first half of the first conductors in the selected group and to supply said inverted signal of the defined time length to the second half of the first conductors in the selected group; 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, wherein each of the plurality of first conductors disposed in the first direction is formed in a pattern of a plurality of land conductor portions electrically connected to each other, the land conductor portion having a substantially H-shape, while each of the plurality of second conductors disposed in the second direction is formed in a pattern of a line shape, such that a signal is supplied to the pattern of the land conductor portions while a detection signal is received from the pattern of the line shape.