Touch sensitive display device having auxiliary lines supplying an auxiliary drive signal

Patent metadata

Field	Value
Publication number	US-9489076-B2
Application number	US-201514965744-A
Country	US
Kind code	B2
Filing date	Dec 10, 2015
Priority date	Jul 24, 2014
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

A touch display device comprises a controller to generate a touch sync signal for controlling timing of a touch sensing period and a display period. A touch panel has a plurality of touch electrodes in a display area of the touch display device. The touch panel generates touch sensing signals indicating whether or not a touch occurs during the touch sensing period. A gate driver supplies gate pulses to gate lines of the touch panel during the display period and supplies a gate line auxiliary drive signal from the first transfer line onto the gate lines during the touch sensing period that mimics the touch drive signal. One or more auxiliary lines supply a supplemental auxiliary drive signal during the touch sensing period that mimics the touch drive signal.

First claim

What is claimed is:

1. A driver circuit for driving a touch integrated display device, the driver circuit comprising:
a first circuit to supply a touch drive signal to a plurality of touch electrodes during a touch sensing period and to receive touch sensing signals from the plurality of touch electrodes in a display area of a touch panel indicating whether or not a touch occurs during a touch sensing period; and
a second circuit to generate pulses during a display period by switching between outputting an off-voltage from an off-voltage supply line and outputting an on-voltage from an on-voltage supply line, the second circuit further to supply a first auxiliary drive signal to the off-voltage supply line during the touch sensing period, and the second circuit further to supply a second auxiliary drive signal to a first auxiliary line and a second auxiliary line during the touch sensing period, the first auxiliary drive signal and the second auxiliary drive signal each mimicking the touch drive signal, wherein the first auxiliary line is adjacent to the off-voltage supply line on a first side of the off-voltage supply line and the second auxiliary line is adjacent to the off-voltage supply line on a second side of the off-voltage supply line opposite the first side.

2. The driver circuit of claim 1 , wherein the first and second auxiliary lines are at least in part on a same layer of the touch panel as the off-voltage supply line.

3. The driver circuit of claim 1 , wherein the second circuit further supplies the pulses and the first auxiliary drive signal to a gate driver that activates respective rows of pixels of the touch panel to receive pixel data during the display period and outputs the first auxiliary drive signal to the gate lines during the touch sensing period.

4. The driver circuit of claim 1 , wherein the on-voltage supply line supplies the on-voltage during the touch sensing period.

5. The driver circuit of claim 1 , wherein the first auxiliary drive signal and the second auxiliary drive signal each has an approximately same signal level and approximately same phase as the touch drive signal during the touch sensing period.

6. The driver circuit of claim 1 , further comprising:
a data driver circuit to provide data voltages representing pixel data to data lines of the touch panel during the display period and to supply a third auxiliary drive signal onto the data lines during the touch sensing period, the third auxiliary drive signal mimicking the touch drive signal.

7. The driver circuit of claim 1 , wherein the on-voltage supply line is adjacent to at least one of the first and second auxiliary lines in the touch panel.

8. The driver circuit of claim 1 ,
wherein the second circuit is further configured to supply a DC supply voltage to a transfer line adjacent to the first auxiliary line on an opposite side of the first auxiliary line from the off-voltage supply line during the display period and the touch sensing period; and
wherein the gate-on voltage supply line is adjacent to the second auxiliary line on an opposite side of the second auxiliary line from the gate-off voltage supply line.

9. The driver circuit of claim 1 , wherein the first and second auxiliary lines comprise first and second multilayer lines respectively having an upper line and a lower line on different layers of the touch panel.

10. The driver circuit of claim 9 , wherein the upper line is on a same layer as the touch electrodes and the lower line is on a same layer as gate lines.

11. The driver circuit of claim 1 , wherein the touch sensing period and the display period alternate with each other in each of a plurality of frames.

12. A method for operating a touch integrated display device, the method comprising:
supplying a touch drive signal to a plurality of touch electrodes during a touch sensing period;
receiving touch sensing signals from the plurality of touch electrodes indicating whether or not a touch occurs in a display area of a touch panel during the touch sensing period;
generating pulses during a display period by switching between outputting an off-voltage from an off-voltage supply line and outputting an on-voltage from an on-voltage supply line;
supplying a first auxiliary drive signal to the off-voltage supply line during the touch sensing period;
supplying a second auxiliary drive signal to a first auxiliary line and a second auxiliary line during the touch sensing period, the first auxiliary drive signal and the second auxiliary drive signal each mimicking the touch drive signal, wherein the first auxiliary line is adjacent to the off-voltage supply line on a first side of the off-voltage supply line and the second auxiliary line is adjacent to the off-voltage supply line on a second side of the off-voltage supply line opposite the first side.

13. The method of claim 12 , wherein the first and second auxiliary lines are at least in part on a same layer of the touch panel as the off-voltage supply line.

14. The method of claim 12 , wherein generating the pulses and the first auxiliary drive signal comprises:
supplying the pulses and the first auxiliary drive signal to a gate driver that activates respective rows of pixels of the touch panel to receive pixel data during the display period and outputs the first auxiliary drive signal to the gate lines during the touch sensing period.

15. The method of claim 12 , further comprising:
supplying the on-voltage on the on-voltage supply line during the touch sensing period.

16. The method of claim 12 , further comprising:
supplying during the touch sensing period, a third auxiliary drive signal onto data lines, the third auxiliary drive signal mimicking the touch drive signal.

17. The method of claim 12 , wherein the first and second auxiliary lines respectively comprises first and second multilayer lines each having an upper line and a lower line on different layers of the touch panel, and wherein supplying the second auxiliary drive signal comprises:
supplying the second auxiliary drive signal on the first and second multilayer lines.

18. The method of claim 12 , wherein the touch sensing period and the display period alternate with each other in each of a plurality of frames.

19. A touch sensitive display device, comprising:
a touch panel having a plurality of touch electrodes in a display area of the touch display device;
a touch sensing circuit to supply a touch drive signal to the plurality of touch electrodes during a touch sensing period and to detect if the touch occurred based on touch sensing signals from the touch electrodes;
a gate driver to supply gate pulses to gate lines of the touch panel during a display period to activate respective rows of pixels to receive pixel data, the gate driver to supply the gate pulses by switching between driving a gate-off voltage from a gate-off voltage supply line onto the gate lines and driving a gate-on voltage from a gate-on voltage supply line onto the gate lines, the gate driver further to supply a gate line auxiliary drive signal from the gate-off voltage supply line onto the gate lines during the touch sensing period, the gate line auxiliary drive signal mimicking the touch drive signal;
a first auxiliary line adjacent to the gate-off voltage supply line on a first side of the gate-off voltage supply line and a second auxiliary line adjacent to the gate-off voltage supply line on a second side of the gate-off voltage supply line opposite the first side, the first and second auxiliary lines to supply a supplemental auxi

Assignees

• Lg Display Co Ltd

Inventors

• Park Yong-Chan
• Kim Ju-Han
• Kim Sung-Chul
• Kim Hoon-Bae

Classifications

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/0443

  using a single layer of sensing electrodes · CPC title

• G06F3/04184

  Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally · CPC title