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Embedded touch screen

  • US 9,483,987 B2
  • Filed: 02/19/2013
  • Issued: 11/01/2016
  • Est. Priority Date: 02/20/2012
  • Status: Active Grant
First Claim
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1. An embedded touch screen, comprising:

  • a first substrate;

    a second substrate comprising, on a front surface thereof;

    a plurality of scanning signal lines extending in a first direction;

    a plurality of video signal lines extending in a second direction;

    a plurality of switching elements, each electrically connected to one of the plurality of scanning signal lines and one of the plurality of video signal lines;

    a plurality of pixels sectioned by the plurality of scanning signal lines and the plurality of video signal lines in matrix being arranged in an image region and each comprising a pixel electrode connected to corresponding one of the plurality of video signal lines via one of the plurality of the switching elements connected to corresponding one of the plurality of scanning signal lines; and

    a common electrode;

    a liquid crystal layer sandwiched between the first substrate and the second substrate;

    an application circuit for applying an alternating signal;

    a detection circuit for detecting a signal excited on a plurality of detection electrodes; and

    a scanning circuit for scanning, during application by the application circuit and detection by the detection circuit, at least one of a plurality of excitation electrodes and the plurality of detection electrodes at least in the second direction,wherein each of the plurality of excitation electrodes extend along the second direction, each of the plurality of detection electrodes extend along the second direction, and each of the plurality of excitation electrodes and each of the plurality of detection electrodes are alternatively arranged and adjacent to each other in the first direction;

    wherein the plurality of excitation electrodes define the pixel electrodes and the plurality of detection electrodes define a video signal shielding electrode provided in parallel to the each of the plurality of video signal lines in an overlapping manner,wherein the scanning circuit provides on-voltage with a plurality of switching elements for each scanning unit that is time-divided, the scanning unit includes a number of scanning signal lines from among the plurality of scanning signal lines, andwherein a contact position in the first direction is detected based on a position at which a change of the signal is detected, and the contact position in the second direction is detected based on a timing at which the change of the signal is detected.

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