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Method, device, and system for detecting transmitter approaching or touching touch sensitive display

  • US 9,910,529 B2
  • Filed: 11/10/2014
  • Issued: 03/06/2018
  • Est. Priority Date: 11/08/2013
  • Status: Active Grant
First Claim
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1. A method for detecting a transmitter approaching or touching a touch sensitive display, the transmitter transmitting an electrical signal mixed from a plurality of frequencies, the touch sensitive display including sequentially a plurality of second electrodes, common electrodes, a liquid crystal layer and pixel electrodes, wherein the common electrodes include a plurality of first electrodes and a plurality of third electrodes and wherein a plurality of sensing points are formed at intersections of the first and second electrodes;

  • the method including the following steps of;

    calculating the total signal strength of a received signal corresponding to the electrical signal with respect to each of the first electrodes;

    calculating the total signal strength of a received signal corresponding to the electrical signal with respect to each of the second electrodes; and

    calculating a relative position between the transmitter and the touch sensitive display according to the calculated total signal strengths of the received signals with respect to each of the first electrodes and the second electrodes,wherein when the third electrodes are coupled to a direct-current (DC) potential to form a shielding region, the total signal strength of the received signal with respect to each of the second electrodes is not calculated.

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