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Induction unit, touch detecting assembly and touch sensitive device

  • US 9,459,739 B2
  • Filed: 07/26/2012
  • Issued: 10/04/2016
  • Est. Priority Date: 07/26/2011
  • Status: Active Grant
First Claim
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1. A touch sensitive device, comprising:

  • a touch detecting assembly comprising a substrate and a plurality of induction units disposed on the substrate and not intersecting with each other, wherein the induction unit comprises a first electrode, a second electrode, a plurality of first structures, and a plurality of second structures, the plurality of first structures are connected end to end via the plurality of second structures, the first electrode is connected with one first structure at one end of the induction unit, the second electrode is connected with another first structure at the other end of the induction unit, and each first electrode and each second electrode are connected with corresponding pins of a control chip;

    a control chip, wherein the first electrodes and the second electrodes of the plurality of induction units are connected with corresponding pins of the control chip, and the control chip is configured to apply a level signal to each first electrode and/or each second electrode to charge a self capacitor generated by a touch on an induction unit, and to calculate a ratio between a first resistor between a first electrode of at least one induction unit and the self capacitor and a second resistor between a second electrode of the at least one induction unit and the self capacitor when the touch is detected on the at least one induction unit; and

    a host computer, configured to receive the ratio between the first resistor and the second resistor sent from the control chip, to determine a touch position in a first direction according to the ratio between the first resistor and the second resistor, and to determine a touch position in a second direction according to a position of the at least one touched induction unit.

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