Noise-adapting touch sensing window

Patent metadata

Field	Value
Publication number	US-8970547-B2
Application number	US-201213728567-A
Country	US
Kind code	B2
Filing date	Dec 27, 2012
Priority date	Feb 1, 2012
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

Embodiments of the invention generally provide an input device with display screens that periodically update (refresh) the screen by selectively driving electrodes corresponding to pixels in a display line, while also using the display screen as a touch area for capacitive sensing. To do this, the input device uses common electrodes for both updating the display and performing capacitive sensing, and interleaves periods of capacitive sensing between periods of updating the display lines (and pixels) based on a display frame. To avoid noise and mitigate interference during capacitive sensing, the input device may switch which windows of time in a display frame are used as capacitive sensing periods based on measurements of interference.

First claim

What is claimed is:

1. A processing system for a display device having an integrated capacitive sensing device, the display device comprising a plurality of common electrodes configured for display updating and capacitive sensing, the processing system comprising:
a driver module comprising driver circuitry configured for coupling to the plurality of common electrodes and configured to drive the plurality of common electrodes for display updating and capacitive sensing;
wherein…

Assignees

• Synaptics Inc

Inventors

• Sabo David S
• Eryilmaz Erol
• Shepelev Petr

Classifications

• G06F3/044 Primary

  Physics · mapped topic

• G06F3/0418

  Physics · mapped topic

• G06F3/0412 Primary

  Physics · mapped topic

• G06F3/04184

  Physics · mapped topic

• G06F3/0446

  Physics · mapped topic