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CAPACITIVE TOUCH SYSTEM

  • US 20160179249A1
  • Filed: 08/19/2014
  • Published: 06/23/2016
  • Est. Priority Date: 08/20/2013
  • Status: Active Grant
First Claim
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1. A capacitive touch system comprising:

  • an active stylus, said active stylus comprising an oscillator, said oscillator being configured so as to continuously emit a signal,a capacitive touch device configured to be in a reset phase, followed by a finger touch sensing phase, different from said reset phase, finger touches being sensed exclusively during said finger touch sensing phase,wherein said capacitive touch device is configured to sense said signal from said active stylus during said reset phase,wherein said capacitive touch device comprises at least one charge sensor, said charge sensor comprisinga charge sensor amplifier, said charge sensor amplifier comprising an input and an output, anda switch between said input and said output, said switch being arranged to be open and closed,the charge sensor amplifier being arranged for conveying the signal of the active stylus from said input to said output through a non-zero resistance value of said switch when said switch is closed, so as to connect said input with said output, wherein said reset phase corresponds to the time period during which said switch is closed, so as to connect said input with said output.

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