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Integrated capacitive sensing and displaying

  • US 9,898,121 B2
  • Filed: 04/30/2010
  • Issued: 02/20/2018
  • Est. Priority Date: 04/30/2010
  • Status: Active Grant
First Claim
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1. A display device having an integrated capacitive proximity sensor, said display device comprising:

  • a plurality of common voltage (VCOM) electrode segments comprising a first VCOM electrode segment and a second VCOM electrode segment,wherein the plurality of VCOM electrode segments is disposed as part of a display element of the display device, andwherein the plurality of VCOM electrode segments is configured for performing both transmitter sensor electrode functions of a transcapacitive sensor and VCOM electrode display functions of the display device;

    a first display drive gate;

    a first plurality of sub-pixel transistors comprising;

    a plurality of drains coupled to the first VCOM electrode segment; and

    a plurality of gates coupled to an output of the first display drive gate;

    a sensor drive mechanism comprising a first row output configured to select the first VCOM electrode segment to perform the transmitter electrode functions;

    a display drive mechanism comprising a first row output for driving the first display drive gate; and

    an arbitration mechanism configured to prevent a sensor drive signal and a display drive signal from being simultaneously driven on the first VCOM electrode segment, the arbitration mechanism comprising;

    a first arbitration gate driven by the first output row of the sensor drive mechanism; and

    a first plurality of transistors that drive, based on an output of the first arbitration gate, the first VCOM electrode segment with only one of the sensor drive signal and the display drive signal.

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