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Display device and electronic unit

  • US 8,976,123 B2
  • Filed: 04/22/2010
  • Issued: 03/10/2015
  • Est. Priority Date: 05/21/2009
  • Status: Active Grant
First Claim
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1. A display device, comprising:

  • a plurality of display pixel electrodes;

    a common electrode provided to oppose the display pixel electrodes;

    a display function layer having an image display function;

    a display control circuit performing image display control by applying a pixel voltage based on an image signal to each of the display pixel electrodes and applying a common drive voltage to the common electrode, the common drive voltage being reversed in polarity in synchronization with a drive cycle of the image display control;

    a touch detection electrode cooperating with the common electrode to form a capacitor; and

    a touch detection circuit performing a detection operation of detecting an external proximity object, based on a detection signal obtained from the touch detection electrode in response to the common drive voltage applied to the common electrode,wherein the touch detection circuit corrects the detection signal obtained from the touch detection electrode with use of the image signal and reference noise data, the reference noise data based on a gray scale value of the image signal and a detection signal value which are correlated with each other, the value of the detection signal including internal noise resulting from the image-signal writing operation for image display with the gray scale value;

    whereinthe touch detection circuit prepares a correction table configured of gray scale values for the image signals actually input and the detection signal values given by the reference noise data which are correlated with each other for every predetermined pixel region including a predetermined number of the display pixel electrodes, and the touch detection circuit corrects the detection signal obtained from the touch detection electrode with use of the correction table.

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