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Multi-mode voltages for touchscreens

  • US 9,268,427 B2
  • Filed: 09/23/2011
  • Issued: 02/23/2016
  • 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;

    a multi-mode power system configured to;

    select a first voltage, the first voltage corresponding to a display phase, the selection of the first voltage resulting in a touch screen component operating at a first capacitance and at a second capacitance, the first capacitance being less than a third capacitance of the touch screen component, and the second capacitance being greater than the third capacitance, the third capacitance being between the first capacitance and the second capacitance on a capacitance curve of the touch screen component, wherein the first, second and third capacitances are between a first part and a second part of the touch screen component, andselect a second voltage, the second voltage corresponding to a touch sensing phase, the second voltage being different than the first voltage, the selection of the second voltage resulting in the touch screen component operating at a fourth capacitance and at a fifth capacitance, the fourth capacitance and the fifth capacitance being greater than a sixth capacitance of the touch screen component, the sixth capacitance being between the fourth capacitance and the fifth capacitance on the capacitance curve of the touch screen component, wherein the fourth, fifth and sixth capacitances are between the first part and the second part of the touch screen component;

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

    a touch sensing system configured to sense touch during the touch sensing phase, wherein the second voltage is applied to the touch screen during the sensing of touch.

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