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User interface responsiveness in an electronic device having a touch screen display

  • US 9,552,094 B2
  • Filed: 12/22/2011
  • Issued: 01/24/2017
  • Est. Priority Date: 12/22/2011
  • Status: Active Grant
First Claim
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1. A method of operating an electronic device that includes a capacitive touch screen display, comprising:

  • sending image signals from a control circuit to a graphics circuit and rendering images on a touch screen display;

    placing the graphics circuit that renders the images to the touch screen display in an inactive mode while the control circuit that inactivated and that controls the graphics circuit and the touch screen display remains in an active mode, the graphics circuit configured to render an image in the inactive mode with a reduced rendering ability;

    while the graphics circuit is in the inactive mode, sensing a user input device in a capacitive field of the touch screen prior to the input device contacting the touch screen while the control circuit remains in the active mode; and

    in response to sensing the user input device within the capacitive field, activating the graphics circuit;

    while the graphics circuit is active, estimating a point of contact on the touch screen display;

    rendering a first image on the touch screen display corresponding to the estimated point of contact;

    determining an actual initial point of contact on the touch screen display, the actual initial point of contact being the point where the touch screen display is initially contacted by the user; and

    maintaining the first image on the touch screen display when the actual initial point of contact is the same as the estimated point of contact, otherwise when the actual initial point of contact is different than the estimated point of contact rendering a second image on the touch screen display corresponding to the actual initial point of contact, the second image being a new image corresponding the actual initial point of contact.

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