Patents Assigned to Synpatics Japan GK
  • Patent number: 9437169
    Abstract: A touch panel control circuit includes a drive circuit that drives Y electrodes of a touch panel, and a detection circuit that is connected to X electrodes and detects a capacitance value of an intersection capacitor. The drive circuit applies a plurality of pulses to the Y electrodes in a predetermined period. The detection circuit includes a switched capacitor circuit capable of operating with respect to an input signal from the X electrodes in synchronization with the plurality of pulses, and an integration circuit that is connected to an output of the switched capacitor circuit and operates in synchronization with the pulses. The switched capacitor circuit is allowed to operate as a filter, and the switched capacitor circuit is set to have characteristics which have a maximum gain at a direct current and a frequency of a corresponding pulse and in which the gain is suppressed at a frequency therebetween.
    Type: Grant
    Filed: December 11, 2014
    Date of Patent: September 6, 2016
    Assignee: Synpatics Japan GK
    Inventors: Takayuki Noto, Akihito Akai