Touch-screen input/output device touch sensing techniques

Patent metadata

Field	Value
Publication number	US-9342181-B2
Application number	US-201213732213-A
Country	US
Kind code	B2
Filing date	Dec 31, 2012
Priority date	Jan 9, 2012
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

A touch-screen input/output device including a touch sensor, a display, a display control module, a touch sensor control module and a synchronizer module. The touch sensor is overlaid on a display. The display control module is communicatively coupled to the display and converts video data into a serial bit stream video display signal including one or more blanking intervals. The touch sensor control module is communicatively coupled to the touch sensor and determines touch events and location of the touch event on the touch sensor during one or more touch sensor scan cycles. The synchronizer module is communicatively coupled between the display control module and the touch sensor control module, and interleaves the one or more touch sensor scan cycles with the one or more blanking intervals of the video display signal.

First claim

What is claimed is:

1. A device comprising:
a touch sensor overlaid on a display;
a display control module communicatively coupled to the display to convert video data into a serial bit stream video display signal include one or more blanking intervals
a touch sensor control module communicatively coupled to the touch sensor to determine touch events and location of the touch event on the touch sensor during touch sensor scan cycles; and
a synchronizer module communicatively coupled between the display control module and the touch sensor control module to interleave the touch sensor scan cycles with the blanking intervals of the video display signal wherein an entire touch sensor array scan for one cycle is performed during vertical blanking intervals and each of a plurality of portions of the touch sensor array scan for another cycle is performed during corresponding horizontal blanking intervals between vertical blanking intervals.

2. The device of claim 1 , wherein the synchronization module provides a control signal to the touch sensor module indicating the occurrence of the vertical and horizontal blanking intervals.

3. The device of claim 1 , wherein the synchronization module shares a common clock between the touch sensor control module and the display control module.

Assignees

• Nvidia Corp

Inventors

• Wyatt David
• Toorians Arman

Classifications

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G09G5/18

  Timing circuits for raster scan displays (specially adapted for television H04N {; synchronisation between the display unit and other display units, videodisc player G09G5/12}) · CPC title

• G06F3/04166 Primary

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · CPC title