Capacitive built-in touch screen having an array substrate on which a transistor panel is arranged, its touch positioning method and display device

Patent metadata

Field	Value
Publication number	US-9360979-B2
Application number	US-201414489559-A
Country	US
Kind code	B2
Filing date	Sep 18, 2014
Priority date	Jun 30, 2014
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

The present disclosure provides a capacitive built-in touch screen, its touch positioning method, and a display device. In the capacitive built-in touch screen, at least one of the gate lines is set as a touch scanning line, and the capacitive built-in touch screen further includes at least one touch sensing line arranged on the array substrate. The touch scanning line intersects the touch sensing line in different planes. The touch sensing line is configured to, when a scanning signal is applied to the touch scanning line, couple the scanning signal through a touch sensing capacitor to obtain and output a touch sensing signal. The touch sensing capacitor is arranged at an intersection of the touch scanning line and the touch sensing lines on different planes.

First claim

What is claimed is:

1. A capacitive built-in touch screen, comprising an array substrate and a color film substrate arranged oppositely to form a cell, a plurality of gate lines, a plurality of data lines, and a plurality of pixel units defined by two adjacent gate lines and two adjacent data lines being arranged on the array substrate, wherein
at least one of the gate lines is set as a touch scanning line,
the capacitive built-in touch screen further comprises at least one touch sensing line arranged on the array substrate,
the touch scanning line intersects the touch sensing line in different planes,
the touch sensing line is configured to, when a scanning signal is applied to the touch scanning line, couple the scanning signal through a touch sensing capacitor to obtain and output a touch sensing signal, and
the touch sensing capacitor is arranged at an intersection of the touch scanning line and the touch sensing lines on different planes,
wherein the array substrate is further provided with a plurality of common electrode lines, which are arranged between adjacent rows of the pixel units,
the capacitive built-in touch screen further comprises a common electrode signal inputting module connected to the plurality of common electrode lines and configured to input common electrode voltage signals to the plurality of common electrode lines,
the capacitive built-in touch screen further comprises a touch sensing module, a common electrode signal compensating module, at least one input TFT and at least one two-way switch,
a gate electrode of the input TFT is connected to a row of the touch scanning line, a source electrode of the input TFT is connected to a column of the touch sensing line, and a drain electrode of the input TFT is connected to a row of the common electrode line,
the input TFT comprises a input first TFT and a second input TFT,
a gate electrode of the first input TFT and a gate electrode of the second input TFT are connected to the touch scanning lines in different rows,
a source electrode of the first input TFT and a source electrode of the second input TFT are connected to the touch sensing lines in different columns,
a drain electrode of the first input TFT and a drain electrode of the second input TFT are connected to the common electrode lines in different rows,
a first input end of the two-way switch is connected to the touch sensing module, a second input end of the two-way switch is connected to the common electrode signal compensating module, and an output end of the two-way switch is connected to the touch sensing line, so that the two-way switch is configured to, when a scanning signal is applied to the row of touch scanning line connected to the gate electrode of the first input TFT, enable the touch sensing module to be in electrical connection with the column of the touch sensing line not connected to the source electrode of the first input TFT, and enable the common electrode signal compensating module to be in electrical connection with the column of the touch sensing line connected to the source electrode of the first input TFT,
the two-way switch is further configured to, when a scanning signal is applied to the row of the touch scanning line connected to the pate electrode of the second input TFT, enable the touch sensing module to be in electrical connection with the column of the touch sensing lines not connected to the source electrode of the second input TFT, and enable the common electrode signal compensating module to be in electrical connection with the column of the touch sensing lines connected to the source electrode of the second input TFT,
the touch sensing module is configured to, when the touch sensing module is in electrical connection with the touch sensing line through the two-way switch, receive the touch sensing signal from the touch sensing line, determine whether the touch operation exists or not in accordance with the presence or absence of the change of the touch sensing signal, and when the touch operation exists, detect the change of touch sensing signal so as to obtain the touch position information, and
the common electrode signal compensating module is configured to, when the common electrode signal compensating module is in electrical connection with the touch sensing line through the two-way switch, transmit a common electrode voltage compensating signal to the common electrode line, which is connected to the common electrode signal compensating module via the input TFT, through the touch sensing line, so as to compensate a change of the common electrode voltage signal on the common electrode line.

2. The capacitive built-in touch screen according to claim 1 , wherein a transparent metal layer on the color film substrate corresponding to a position where the touch sensing capacitor is located is provided with an opening.

3. The capacitive built-in touch screen according to claim 2 , wherein the touch sensing line is arranged between adjacent columns of the pixel units.

4. The capacitive built-in touch screen according to claim 3 , further comprising a touch sensing module connected to the touch sensing line, and configured to receive the touch sensing signal from the touch sensing line, determine whether a touch operation exists or not in accordance with the presence or absence of a change of the touch sensing signal, and when the touch operation exists, detect the change of touch sensing signal so as to obtain touch position information.

5. The capacitive built-in touch screen according to claim 3 ,
wherein the array substrate is further provided with a plurality of common electrode lines, which are arranged between adjacent rows of the pixel units,
the capacitive built-in touch screen further comprises a common electrode signal inputting module connected to the plurality of common electrode lines and configured to input common electrode voltage signals to the plurality of common electrode lines,
the capacitive built-in touch screen further comprises a touch sensing module, a common electrode signal compensating module, at least one input TFT and at least one two-way switch,
a gate electrode of the input TFT is connected to a row of the touch scanning line, a source electrode of the input TFT is connected to a column of the touch sensing line, and a drain electrode of the input TFT is connected to a row of the common electrode line,
the input TFT comprises a input first TFT and a second input TFT,
a gate electrode of the first input TFT and a gate electrode of the second input TFT are connected to the touch scanning lines in different rows,
a source electrode of the first input TFT and a source electrode of the second input TFT are connected to the touch sensing lines in different columns,
a drain electrode of the first input TFT and a drain electrode of the second input TFT are connected to the common electrode lines in different rows,
a first input end of the two-way switch is connected to the touch sensing module, a second input end of the two-way switch is connected to the common electrode signal compensating module, and an output end of the two-way switch is connected to the touch sensing line, so that the two-way switch is configured to, when a scanning signal is applied to the row of touch scanning line connected to the gate electrode of the first input TFT, enable the touch sensing module to be in electrical connection with the column of the touch sensing lines not connected to the source electrode of the first input TFT, and enable the common electrode signal compensating module to be in electrical connection with the column of the touch sensing line connected to the source electrode of the first input TFT,
the two-way switch is further configured to, when a scanning signal is applied to the row of the touch scanning line conne

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Display Tech Co

Inventors

• Liu Dong

Classifications

• G02F1/13338 Primary

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

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F3/04166

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · CPC title

• G06F3/04164

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title