IP Library › Granted Patent US 9,268,429
Granted Patent B2
US 9,268,429 · App. 14/047,960 · Granted Feb 23, 2016

Integrated display and touch screen

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Quick Facts
Patent No.
US 9,268,429
App. No.
14/047,960
Granted
Feb 23, 2016
Kind
B2
Abstract

Liquid crystal display (LCD) touch screens integrate touch sensing elements with display circuitry and may include in-plane-switching (IPS) LCDs. A method of operating the integrated touch sensing elements with the display circuitry includes dividing touch-sensing circuitry of the touch screen into a plurality of drive segments, each drive segment overlapping one or more display rows; updating the display at a predetermined refresh rate; stimulating the plurality of drive segments at a predetermined scan rate; and changing the sequence of stimulating the plurality of drive segments as required to prevent simultaneously stimulating a drive segment that overlaps a display row currently being updated.

Claims (10)

1. A method of operating an integrated liquid crystal display touch screen whereby updating of the display can be done concurrently with touch scanning, the method comprising:

dividing touch-sensing circuitry of the touch screen into a plurality of drive segments,

each drive segment overlapping one or more display rows;

updating portions of the display at a predetermined refresh rate during each frame;

concurrently with the updating of portions of the display, stimulating the plurality of drive segments at a predetermined scan rate during each frame; and

changing a sequence of stimulating the plurality of drive segments from a first sequence to a second sequence, different from the first sequence, so as to permit the concurrent updating and stimulating, while preventing simultaneously stimulating a drive segment that overlaps a display row currently being updated,

wherein stimulating the plurality of drive segments in a first sequence and a second sequence occurs during each frame.

2. The method of claim 1 wherein the predetermined scan rate is an integer multiple of the predetermined refresh rate.

3. The method of claim 2 wherein the predetermined scan rate is twice the predetermined refresh rate.

4. The method of claim 1 further comprising changing the sequence of stimulating the plurality of drive segments as required to prevent concurrently stimulating a drive segment that is adjacent a display row currently being updated.