POSITION DETECTING DEVICE
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United States of America Patent
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app pub date -
Sep 12, 2016
filing date -
Mar 17, 2014
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Abstract
A position detecting device detects a position indicated by a finger or a stylus over a display device. The position detecting device includes a noise sensor, which, in operation, generates indications of noise, and a noise detecting circuit, which, in operation, outputs noise detection signals based on indications of noise generated by the noise sensor. The position detecting device includes a pulse generating circuit, which, in operation, generates pulses having a periodic cycle based on a periodic cycle of a synchronizing pulse of the display device, and phase control circuitry, which, in operation, controls a phase of the pulses generated by the pulse generating circuit to synchronize timing of the output of noise detection signals by the noise detecting circuit with timing of the pulses generated by the pulse generating circuit. A receiving circuit of the position control device, in operation, receives position signals in synchronization with the timing of the pulses generated by the pulse generating circuit.
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