METHOD OF DRIVING INPUT DEVICE

• Main Authors: KADO HIROYUKI, NAKAYAMA TAKAHITO, AOYAMA TOSHIYUKI, KOSUGI NAOKI, TOKAI AKIRA, KASAHARA SHIGEO, INOUE SHUJI, INOUE MANABU, TAKAGI KAZUKI
• Format: Patent
• Language: English; Japanese
• Published: 07.05.2015
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

PROBLEM TO BE SOLVED: To provide an input device capable of preventing reduction of detection accuracy of a touch operation made thereon even when noises are generated caused from a liquid crystal display.SOLUTION: Detecting noises from the external caused from a liquid crystal display, a signal controller 8 shifts to a mode 2. After shifting to the mode 2, the signal controller 8 controls 1H of an image signal to T2 which is shorter than the 1H (T1) in the mode 1. A sensor control circuit 13 receives a timing signal 1 which is generated by the signal controller 8 in synchronism with the image signal in one frame period, and generates a sensor signal for driving a sensor drive circuit 6 and a signal detection circuit 7 in synchronism with the received timing signal. The sensor drive circuit 6 supplies a drive signal to a drive electrode 11 corresponding to the sensor signal generated by the sensor control circuit 13. The signal detection circuit 7 receives the detection signal according to the sensor signal. 【課題】入力装置において、液晶表示起因のノイズが発生した場合に、タッチ操作時の検出精度の低下を防ぐ。【解決手段】信号制御装置８は、液晶表示に起因する外部からのノイズを検出すると、モード２に移行する。信号制御装置８は、モード２に移行すると、映像信号の１Ｈをモード１の１Ｈ（Ｔ１）より短いＴ２に設定する。センサ制御回路１３は、信号制御装置８が１フレーム期間内で、映像信号に同期して生成するタイミング信号１を受信し、受信したタイミング信号に同期して、センサ駆動回路６及び信号検出回路７を駆動させるセンサ信号を生成する。センサ駆動回路６は、センサ制御回路１３が生成したセンサ信号に応じて駆動信号を駆動電極１１に供給する。また、信号検出回路７は、センサ信号に応じて、検出信号を受信する。【選択図】図１