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Source driver touch transmitter in parallel with display drive

  • US 9,298,309 B2
  • Filed: 06/30/2014
  • Issued: 03/29/2016
  • Est. Priority Date: 04/29/2014
  • Status: Active Grant
First Claim
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1. A processing system for a display device integrated with a capacitive sensing device, the processing system comprising:

  • a driver module comprising driver circuitry, the driver module configured for coupling to a sub-pixel with a first source line and a first common electrode, wherein the driver module is configured to;

    update the sub-pixel by driving the first source line to a first voltage;

    drive the first common electrode for capacitive sensing by modulating the first common electrode between a second voltage and a third voltage; and

    shift the first voltage driven onto the first source line while the first common electrode is modulated between the second voltage and the third voltage by a value about equal to a difference between the second voltage and the third voltage;

    a receiver module coupled to a plurality of receiver electrodes configured to receive resulting signals with the receiver electrodes while the first common electrode is modulated between the second voltage and the third voltage; and

    wherein the processing system is configured to determine positional information based on the resulting signals.

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