Touch display system, and driving apparatus and driving method thereof

Patent metadata

Field	Value
Publication number	US-2017123527-A1
Application number	US-201514931314-A
Country	US
Kind code	A1
Filing date	Nov 3, 2015
Priority date	Nov 3, 2015
Publication date	May 4, 2017
Grant date	—

Abstract

A touch display system, and a driving apparatus and a driving method thereof are provided. The driving apparatus includes at least one gate driver, at least one source driver, a common voltage generator and a switching circuit. The gate driver drives the gate lines by turns in a scanning order. An output terminal of the common voltage generator outputs a common voltage. The switching circuit electrically connects a plurality of common lines of the touch display panel to the output terminal of the common voltage generator by turns according to the scanning order of the gate driver.

First claim

What is claimed is:

1 . A driving apparatus of a touch display panel, comprising:
at least one gate driver circuit, coupled to a plurality of gate lines of the touch display panel, wherein the at least one gate driver circuit drives the gate lines by turns in a scanning order; at least one source driver circuit, coupled to a plurality of source lines of the touch display panel; a common voltage generator, having a output terminal configured to output a common voltage; and a switching circuit, electrically connected to the output terminal of the common voltage generator to receive the common voltage, wherein the switching circuit electrically connects a plurality of common lines of the touch display panel to the output terminal of the common voltage generator by turns according to the scanning order of the gate driver circuit in a display driving period.

2 . The driving apparatus according to claim 1 , wherein the gate lines are grouped into a plurality of gate line groups, the gate line groups are one-to-one corresponding to the common lines, when one of the gate lines belonging to a scanned gate line group among the gate line groups is scanned by the gate driver circuit, the switching circuit selectively electrically connects one of the common lines which is corresponding to the scanned gate line group to the output terminal of the common voltage generator, and selectively electrically disconnects the rest of the common lines from the output terminal of the common voltage generator.

3 . The driving apparatus according to claim 1 , wherein the switching circuit comprises:
a plurality of switches, having first terminals electrically connected in common to the output terminal of the common voltage generator to receive the common voltage, and second terminals electrically one-to-one connected to the common lines, wherein when one of the gate lines belonging to a scanned gate line group among the gate line groups is scanned by the gate driver circuit, one of the switches is turned on to electrically connect one of the common lines which is corresponding to the scanned gate line group to the output terminal of the common voltage generator, and the others of the switches are turned off to electrically disconnect the rest of the common lines from the output terminal of the common voltage generator.

4 . The driving apparatus according to claim 1 , further comprising:
a sensing circuit, having a plurality of input terminals electrically one-to-one connected to the common lines, and configured to sense a plurality of common electrodes of the touch display panel through the common lines in a touch driving period, so as to detect a touch event of the touch display panel.

5 . A driving method of a touch display panel, comprising:
driving a plurality of gate lines of the touch display panel in a scanning order by at least one gate driver circuit; driving a plurality of source lines of the touch display panel by at least one source driver circuit; providing a common voltage by an output terminal of the common voltage generator; and electrically connecting a plurality of common lines of the touch display panel to the output terminal of the common voltage generator by turns according to the scanning order of the gate driver circuit by a switching circuit.

6 . The driving method according to claim 5 , wherein the gate lines are grouped into a plurality of gate line groups, the gate line groups are one-to-one corresponding to the common lines, and the step of electrically connecting the common lines to the output terminal of the common voltage generator by turns comprises:
when one of the gate lines belonging to a scanned gate line group among the gate line groups is scanned by the gate driver circuit, selectively electrically connecting one of the common lines which is corresponding to the scanned gate line group to the output terminal of the common voltage generator, and selectively electrically disconnecting the rest of the common lines from the output terminal of the common voltage generator by the switching circuit.

7 . The driving method according to claim 5 , further comprising:
sensing a plurality of common electrodes of the touch display panel through the common lines in a touch driving period by a sensing circuit, so as to detect a touch event of the touch display panel.

8 . A touch display system, comprising:
a touch display panel, comprising a plurality of gate lines, a plurality of source lines and a plurality of common lines; and a driving apparatus, the driving apparatus comprising:
at least one gate driver circuit, coupled to the gate lines, wherein the at least one gate driver circuit drives the gate lines by turns in a scanning order;
at least one source driver circuit, coupled to the plurality of source lines;
a common voltage generator, having a output terminal configured to output a common voltage; and
a switching circuit, electrically connected to the output terminal of the common voltage generator to receive the common voltage, wherein the switching circuit electrically connects the common lines to the output terminal of the common voltage generator by turns according to the scanning order of the gate driver circuit in a display driving period.

9 . The touch display system according to claim 8 , wherein the gate lines are grouped into a plurality of gate line groups, the gate line groups are one-to-one corresponding to the common lines, when one of the gate lines belonging to a scanned gate line group among the gate line groups is scanned by the gate driver circuit, the switching circuit selectively electrically connects one of the common lines which is corresponding to the scanned gate line group to the output terminal of the common voltage generator, and selectively electrically disconnects the rest of the common lines from the output terminal of the common voltage generator.

10 . The touch display system according to claim 8 , wherein the switching circuit comprises:
a plurality of switches, having first terminals electrically connected in common to the output terminal of the common voltage generator to receive the common voltage, and second terminals electrically one-to-one connected to the common lines, wherein when one of the gate lines belonging to a scanned gate line group among the gate line groups is scanned by the gate driver circuit, one of the switches is turned on to electrically connect one of the common lines which is corresponding to the scanned gate line group to the output terminal of the common voltage generator, and the others of the switches are turned off to electrically disconnect the rest of the common lines from the output terminal of the common voltage generator.

11 . The touch display system according to claim 8 , wherein the driving apparatus further comprising:
a sensing circuit, having a plurality of input terminals electrically one-to-one connected to the common lines, and configured to sense a plurality of common electrodes of the touch display panel through the common lines in a touch driving period, so as to detect a touch event of the touch display panel.

Assignees

• Himax Tech Ltd

Inventors

• Chuang Chen-Jung
• Huang Jian-Ming

Classifications

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G09G2354/00

  Aspects of interface with display user · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G3/3677

  suitable for active matrices only · CPC title

• G09G3/3655

  Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors · CPC title