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Display device

  • US 9,652,078 B2
  • Filed: 03/20/2015
  • Issued: 05/16/2017
  • Est. Priority Date: 03/24/2014
  • Status: Active Grant
First Claim
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1. A display device comprising:

  • a first substrate having a pixel electrode and a counter electrode;

    a second substrate having a plurality of detection electrodes of a touch panel;

    a liquid crystal interposed between the first substrate and the second substrate;

    a drive circuit for supplying a counter voltage and a touch panel scanning voltage to the counter electrode; and

    a detection circuit for detecting presence or absence of a touch based on a current flowing through the detection electrodes, wherein;

    the counter electrode is divided into m blocks, where m is set to an integer equal to or larger than 2 (m≧

    2);

    the m divided blocks of the counter electrode are commonly provided to pixels on a plurality of consecutive display lines;

    the m divided blocks of the counter electrode serve as scanning electrodes of the touch panel;

    the drive circuit sequentially supplies the touch panel scanning voltage to the m divided blocks of the counter electrode;

    the detection circuit is configured to;

    (a) detect presence or absence of noise or water droplet adhesion based on the current flowing through the detection electrodes upon supply of the touch panel scanning voltage to the m divided blocks of the counter electrode; and

    (b) distinguish between noise and water droplet based on the current flowing through the detection electrodes on the assumption that a (m+1)th counter electrode exists in addition to the in divided blocks of the counter electrode, and the touch panel scanning voltage is supplied to the (m+1)th counter electrode, which is in synchronization with the touch panel scanning voltage supplied to the m divided blocks of the counter electrode.

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