Image display systems and gate driving circuits

Patent metadata

Field	Value
Publication number	US-2016378232-A1
Application number	US-201615191182-A
Country	US
Kind code	A1
Filing date	Jun 23, 2016
Priority date	Jun 25, 2015
Publication date	Dec 29, 2016
Grant date	—

Abstract

A gate driving circuit includes a plurality of shift registers arranged to output the gate driving signals in sequence. The shift registers are divided into groups arranged in sequence, wherein the driving signal from a first one of a N+1 th group of shift registers is next to the driving signal from a first one of a N th group of shift registers; and at least one first compensation circuit connected to the last one of the N th group of shift registers and the first one of the N+1 th group of shift registers, wherein the first compensation circuit provides a first control signal to enable the last one of the N th group of shift registers to perform signal holding, and provides a second control signal to enable the first one of the N+1 th group of shift registers to perform pre-charging, wherein N is an integer greater than zero.

First claim

What is claimed is:

1 . An image display system, comprising:
a touch display panel, comprising a pixel matrix with a plurality of pixels; and a gate driving circuit, arranged to generate a plurality of gate driving signals to drive the pixels on the touch display panel according to a group of clock signals, wherein the gate driving circuit comprises:
a plurality of shift registers, arranged to output the gate driving signals in sequence, wherein the plurality of shift registers are divided into groups arranged in sequence, and in adjacent N th and N+1 th groups of shift registers of the groups, the driving signal from a first one of the N+1 th group of shift registers is next to the driving signal from a last one of the N th group of shift registers; and
at least one first compensation circuit, disposed between the adjacent N th and N+1 th groups of shift registers, and connected to the last one of the N th group of shift registers and the first one of the N+1 th group of shift registers, wherein the first compensation circuit provides a first control signal to enable the last one of the N th group of shift registers to perform signal holding, and provides a second control signal to enable the first one of the N+1 th group of shift registers to perform pre-charging, wherein N is an integer greater than zero.

2 . The image display system as claimed in claim 1 , wherein the last one of the N th group of shift registers is a K th shift register of the plurality of shift registers and the first one of the N+1 th group of shift registers is a K+ 1 th shift register of the plurality of shift registers, and the driving signal from the K th shift register is not output to the K+1 th shift register and the driving signal from the K+1 th shift register is not output to the K th shift register, wherein K is an integer greater than zero.

3 . The image display system as claimed in claim 2 , wherein, when the gate driving circuit is operated in a forward scan, the first compensation circuit, during a touch sensing period, outputs a first signal to a reverse input terminal of the K th shift register according to the first control signal so that the K th shift register performs signal holding, and outputs a second signal to a forward input terminal of the K+1 th shift register according to the second control signal so that the K+1 th shift register performs pre-charging.

4 . The image display system as claimed in claim 3 , wherein, when the gate driving circuit is operated in a reverse scan, the first compensation circuit during the touch sensing period, outputs the second signal to the forward input terminal of the K+ 1 th shift register according to the second control signal so that the K th shift register performs signal holding, and outputs the first signal to the reverse input terminal of the K th shift register according to the first control signal so that the K th shift register performs pre-charging.

5 . The image display system as claimed in claim 2 , wherein the first compensation circuit comprises a first compensation subcircuit and a second compensation subcircuit, each of the first and second compensation subcircuits has a first circuit and a second circuit, and when the gate driving circuit is operated in a forward scan, the first circuit of the first compensation subcircuit enables the K t shift register to perform signal holding during a touch sensing period according to a driving signal from the W th shift register of the plurality of shift registers and the first control signal, and the first circuit of the second compensation subcircuit enables the K+ 1 th shift register to perform pre-charging during the touch sensing period according to a driving signal from a M th shift register of the plurality of shift registers and the second control signal, wherein W and M are positive integers, M is smaller than K+ 1 , and W is smaller than K.

6 . The image display system as claimed in claim 5 , wherein, when the gate driving circuit is operated in a reverse scan, the second circuit of the second compensation subcircuit enables the K+1 th shift register to perform signal holding during the touch sensing period according to a driving signal from the Y th shift register of the plurality of shift registers and the second control signal, and the second circuit of the first compensation subcircuit enables the K t shift register to perform pre-charging during the touch sensing period according to a driving signal from a Z th shift register of the plurality of shift registers and the first control signal, wherein Y and Z are positive integers, Y is greater than K+ 1 , and Z is greater than K.

7 . The image display system as claimed in claim 6 , wherein the first compensation subcircuit comprises:
a first switch, having a first terminal coupled to the first control signal, and a second terminal coupled to a reverse input terminal of the K th shift register; a second switch, coupled between a control terminal of the first switch and the driving signal of the W th shift register; a third switch, coupled between the control terminal of the first switch and the driving signal of the Z th shift register; a fourth switch, between the control terminal of the first switch and a constant voltage; and a fifth switch, between the control terminal of the first switch and the constant voltage, wherein control terminals of the fourth and fifth switches are

8 . The image display system as claimed in claim 7 , wherein the second compensation subcircuit comprises:
a sixth switch, having a first terminal coupled to the second control signal, and a second terminal coupled to a forward input terminal of the K+ 1 th shift register; a seventh switch, coupled between the control terminal of the first switch and the driving signal of the M th shift register; an eighth switch, coupled between the control terminal of the first switch and the driving signal of the Y th shift register; a ninth switch, between the control terminal of the first switch and the constant voltage; and a tenth switch, between the control terminal of the first switch and the constant voltage, wherein control terminals of the ninth and tenth switches are coupled to corresponding driving signals, respectively.

9 . The image display system as claimed in claim 1 , wherein the touch display panel comprises:
the gate driving circuit, arranged to generate the gate driving signals according to the group of clock signals; a data transmission circuit, arranged to generate a plurality of data signals and provide the data signals to the pixels of the pixel matrix; and a control chip, arranged to provide the group of clock signals to control the plurality of shift registers, wherein the control chip suspends or pauses the group of clock signals during touch sensing periods of the touch display panel.

10 . The image display system as claimed in claim 1 , further comprising a second compensation circuit connected to a last one of the plurality of shift registers to provide a third control signal thereby enabling the last one of the plurality of shift registers to perform signal holding.

11 . A gate driving circuit generating a plurality of gate driving signals to drive pixels on a touch display panel according to a group of clock signals, the gate driving circuit comprising:
a plurality of shift registers, arranged to output the gate driving signals in sequence, wherein the plurality of shift registers are divided into groups arranged in sequence, and in adjacent N th and N+ 1 th groups of shift registers of the groups, the driving signal from a first one of the N+ 1 th group of shift registers i

Assignees

• Innolux Corp

Inventors

• Hsu Wen-Tsai
• Lien Wei-Kuang

Classifications

• G09G2310/0294

  Details of sampling or holding circuits arranged for use in a driver for data electrodes · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G09G3/3677

  suitable for active matrices only · CPC title

• G09G2310/0286

  Details of a shift registers arranged for use in a driving circuit · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title