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Multi-mode voltages for touchscreens

  • US 9,939,950 B2
  • Filed: 01/29/2016
  • Issued: 04/10/2018
  • Est. Priority Date: 09/23/2011
  • Status: Active Grant
First Claim
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1. An integrated touch screen device comprising:

  • a touch screen including a plurality of display pixels and a pixel transistor, the pixel transistor associated with an operating capacitance, the operating capacitance being between a drain of the pixel transistor and a second part of the pixel transistor;

    a multi-mode power system configured to;

    operate the pixel transistor in a first voltage driving mode, the first voltage driving mode corresponding to a display phase, the selection of one or more first driving voltages for the pixel transistor in the first voltage mode resulting in a value of the operating capacitance varying within a first portion of a characteristic capacitance curve of the pixel transistor, andoperate the pixel transistor in a second voltage driving mode, the second voltage driving mode corresponding to a touch sensing phase, the selection of one or more second driving voltages for the pixel transistor in the second voltage driving mode resulting in the value of the operating capacitance varying within a second portion, different from the first portion, of the characteristic capacitance curve of the pixel transistor;

    a display system configured to update an image displayed by the display pixels during the display phase, wherein the first voltage driving mode is applied to the pixel transistor during the updating of the image; and

    a touch sensing system configured to sense touch during the touch sensing phase, wherein the second voltage driving mode is applied to the pixel transistor during the sensing of touch.

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