Touch and gesture sensing system and driving method thereof

Patent metadata

Field	Value
Publication number	US-2015145819-A1
Application number	US-201414505903-A
Country	US
Kind code	A1
Filing date	Oct 3, 2014
Priority date	Nov 26, 2013
Publication date	May 28, 2015
Grant date	—

Abstract

A touch and gesture sensing system and a driving method thereof are provided. The touch and gesture sensing system comprises: a display panel comprising a pixel array, sensors, and sensor lines connected to the sensors; a display driving circuit that writes a data voltage to the pixels of the pixel array during a display driving period; and a sensor driving circuit that applies a touch sensor driving signal to the sensors to sense touch input during a touch sensing period and applies a gesture sensor driving signal to the sensors to sense gesture input during a gesture sensing period.

First claim

What is claimed is:

1 . A touch and gesture sensing system comprising:
a display panel comprising a pixel array, sensors, and sensor lines connected to the sensors; a display driving circuit that writes a data voltage to the pixels of the pixel array during a display driving period; and a sensor driving circuit that applies a touch sensor driving signal to the sensors to sense touch input during a touch sensing period and applies a gesture sensor driving signal to the sensors to sense gesture input during a gesture sensing period.

2 . The touch and gesture sensing system of claim 1 , wherein the display driving period is divided into a plurality of pixel driving periods, the touch sensing period is divided into a plurality of touch sensing periods, and the number of pixel driving periods is greater than the number of touch sensing periods.

3 . The touch and gesture sensing system of claim 2 , wherein an equal number of pixel driving periods and touch sensing periods are arranged in an alternating manner, the gesture sensing period is divided into a plurality of gesture sensing periods, and the remaining number of pixel driving periods and the gesture sensing periods are arranged in an alternating manner.

4 . The touch and gesture sensing system of claim 3 , wherein the sensors are mutual capacitance sensors that are at the crossings of the sensor lines.

5 . The touch and gesture sensing system of claim 4 , wherein the sensor lines comprise:
Tx lines of a first group in a first area of the screen; Rx lines of the first group in the first area; Tx lines of a second group in a second area of the screen; and Rx lines of the second group in the second area, wherein the Rx lines of the first group and the Rx lines of the second group are separated at the boundary between the first area and the second area.

6 . The touch and gesture sensing system of claim 5 , wherein the sensor driving circuit applies the touch sensor driving signal simultaneously to a Tx line pair comprising a Tx line in the first area and a Tx line in the second area during the touch sensing period, and receives signals from the sensors through the Rx lines of the first and second groups in synchronization with the touch sensor driving signal.

7 . The touch and gesture sensing system of claim 1 , wherein the sensors are self capacitance sensors that are connected to the sensor lines formed along one direction on a one-to-one basis.

8 . A driving method of a touch and gesture sensing system, the method comprising:
writing a data voltage to pixels of a pixel array during a display driving period; applying a touch sensor driving signal to sensors to sense touch input during a touch sensing period; and applying a gesture sensor driving signal to the sensors to sense gesture input during a gesture sensing period, wherein the gesture sensing period is allocated in the remaining part of one frame period, except the display driving period and touch sensing period.

9 . The method of claim 8 , wherein the display driving period is divided into a plurality of pixel driving periods, the touch sensing period is divided into a plurality of touch sensing periods, and the number of pixel driving periods is greater than the number of touch sensing periods.

10 . The method of claim 9 , wherein an equal number of pixel driving periods and touch sensing periods are arranged in an alternating manner, the gesture sensing period is divided into a plurality of gesture sensing periods, and the remaining number of pixel driving periods and the gesture sensing periods are arranged in an alternating manner.

Assignees

• Lg Display Co Ltd

Inventors

• Bae Sanghyuck

Classifications

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/0488

  using a touch-screen or digitiser, e.g. input of commands through traced gestures · CPC title

• G06F3/044

  by capacitive means · CPC title

• G02F1/13338 Primary

  Input devices, e.g. touch panels · CPC title