CN115344142A

CN115344142A - Touch control display device

Info

Publication number: CN115344142A
Application number: CN202211012416.6A
Authority: CN
Inventors: 李家圻; 林城兴; 陈政德
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2022-04-14
Filing date: 2022-08-23
Publication date: 2022-11-15
Also published as: TWI818510B; TW202340924A

Abstract

The touch display device comprises a first signal line, a second signal line, a third signal line, a common signal line and a coupling circuit. The first signal line transmits a first signal. The second signal line transmits a second signal. The third signal line transmits a third signal. The first signal, the second signal and the third signal are different. The common signal line transmits the level of the voltage. The coupling circuit is coupled with the first signal line, the second signal line, the third signal line and the common signal line. The first stage of the coupling circuit adjusts the node of the coupling circuit to a first level according to the first signal and the second signal so as to couple the level of the voltage to the touch electrode line. The second stage of the coupling circuit couples the third signal to the node according to the first signal and the second signal to adjust the first level to the second level of the node. The coupling circuit responds to the level of the second level coupling voltage to the touch electrode wire.

Description

Touch control display device

Technical Field

The present disclosure relates to a display device. In particular, the present disclosure relates to a touch display device.

Background

In the conventional Touch display device, the size of a Panel and a Gate (Gate) controller of an In-Cell Touch Panel (In-Cell Touch Panel) are increased, so that the recovery capability of a Touch electrode is insufficient, and the Touch electrode is easily affected by resistance and capacitance oscillation In a circuit, thereby affecting the display picture of the Touch display device.

In addition, if the control voltage of the touch electrode is directly increased to solve the problem of the recovery capability of the touch electrode, the display image of the touch display device has display defects (mura) and the power consumption of the touch display device will increase.

Therefore, there are many defects in the above technologies, and there is a need for those skilled in the art to develop other suitable circuit designs for touch display devices.

Disclosure of Invention

One aspect of the present disclosure relates to a touch display device. The touch display device comprises a first signal line, a second signal line, a third signal line, a common signal line and a coupling circuit. The first signal line is used for transmitting a first signal. The second signal line is used for transmitting a second signal. The third signal line is used for transmitting a third signal. The first signal, the second signal and the third signal are all different. The common signal line is used for transmitting the level of the voltage. The coupling circuit is coupled to the first signal line, the second signal line, the third signal line and the common signal line. The coupling circuit is used for adjusting a node of the coupling circuit to a first level according to the first signal and the second signal in the first stage so as to couple the level of the voltage to the touch electrode wire. The coupling circuit is further configured to couple the third signal to the node according to the first signal and the second signal at the second stage to adjust the first level to the second level of the node. The coupling circuit responds to the level of the second level coupling voltage to the touch electrode wire.

Another aspect of the present invention relates to a touch display device. The touch display device comprises a first signal line, a second signal line, a common signal line and a coupling circuit. The first signal line is used for transmitting a first signal. The second signal line is used for transmitting a second signal. The first signal and the second signal are different. The common signal line is used for transmitting the low level and the high level of the common electrode signal. The coupling circuit is coupled to the first signal line, the second signal line and the common signal line. The coupling circuit is used for adjusting the node of the coupling circuit to a first level according to the low level of the first signal, the second signal and the common electrode signal in a first stage so as to couple the low level of the common electrode signal to the touch electrode wire, and the coupling circuit is further used for adjusting the node to a second level according to the high level of the first signal, the second signal and the common electrode signal in a second stage. The coupling circuit couples the high level of the common electrode signal to the touch electrode wire in response to the second level.

Drawings

The disclosure may be better understood with reference to the following description taken in the following paragraphs and the accompanying drawings in which:

fig. 1 is a schematic block diagram of a circuit of a touch display device according to some embodiments of the present disclosure;

fig. 2 is a schematic block diagram of a coupling circuit of a touch display device according to some embodiments of the disclosure;

fig. 3 is a timing diagram of control signals of a touch display device according to some embodiments of the disclosure;

fig. 4 is a schematic block diagram of a circuit of a touch display device according to some embodiments of the disclosure;

fig. 5 is a timing diagram of control signals of a touch display device according to some embodiments of the disclosure;

fig. 6 is a timing diagram of control signals of a touch display device according to some embodiments of the disclosure;

fig. 7 is a schematic block diagram of a circuit of a touch display device according to some embodiments of the disclosure;

fig. 8 is a schematic circuit block diagram illustrating a coupling circuit of a touch display device according to some embodiments of the disclosure;

fig. 9 is a timing diagram of control signals of a touch display device according to some embodiments of the disclosure;

fig. 10 is a schematic block diagram of a circuit of a touch display device according to some embodiments of the disclosure;

fig. 11 is a timing diagram of control signals of a touch display device according to some embodiments of the disclosure; and

fig. 12 is a timing diagram of control signals of a touch display device according to some embodiments of the disclosure.

Wherein the reference numerals are as follows:

TP _ SW: first signal

TP _ SWC: second signal

TP _ SWB: third signal

Goff: signal

Vcom: voltage of

Vcom _ TP: common electrode signal

P1 to P12: coupling circuit

T1: first point crystal

T2: second transistor

C1: capacitor with a capacitor element

C2: parasitic capacitance

N1: node point

D1: touch control electrode wire

SR: shift register

IC/FPC: integrated circuit with a plurality of transistors

TP1 to TP3: touch electrode

D1 to D3: touch electrode wire

H: high level

L: low level

Com-H: high level of common electrode signal

Com: quasi-position

Com-L: low level of common electrode signal

HH: higher level

I1 to I8: phases

Detailed Description

The spirit of the present disclosure will be described in detail and illustrated in the drawings, and it is to be understood that the scope of the present disclosure may be changed or modified by the techniques taught in the present disclosure without departing from the spirit and scope of the present disclosure.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms "a", "an", "the" and "the", as used herein, also include the plural forms.

As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.

With respect to the term (terms) used herein, it is common to have each term used in its ordinary meaning in the art, in the context of this document, and in the specific context, unless otherwise indicated. Certain words used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the disclosure.

Fig. 1 is a block diagram illustrating a circuit of a touch display device 100 according to some embodiments of the present disclosure. In some embodiments, the touch display device 100 includes a first signal line, a second signal line, a third signal line, a common signal line, and a coupling circuit (e.g., coupling circuit P1 to coupling circuit P6). The first signal line is used for transmitting a first signal TP _ SW. The second signal line is used for transmitting a second signal TP _ SWC. The third signal line is used for transmitting a third signal TP _ SWB. The first signal TP _ SW, the second signal TP _ SWC, and the third signal TP _ SWB are different. The common signal line is used for transmitting the level Com of the voltage Vcom. The coupling circuits (e.g., the coupling circuits P1 to P6) are coupled to the first signal line, the second signal line, the third signal line and the common signal line.

To make the structure of the coupling circuit of the present disclosure easy to understand, please refer to fig. 2, and fig. 2 is a schematic circuit block diagram of a coupling circuit P1 of a touch display device according to some embodiments of the present disclosure. The coupling circuit P1 is used to adjust the node N1 of the coupling circuit P1 to a first level according to the first signal TP _ SW and the second signal TP _ SWC in the first stage, so as to couple the level Com of the voltage Vcom to the touch electrode line D1. The coupling circuit P1 is further configured to couple the third signal TP _ SWB to the node N1 at the second stage according to the first signal TP _ SW and the second signal TP _ SWC to adjust the first level of the node N1 to the second level. The coupling circuit P1 responds to the level Com of the second level coupling voltage Vcom to the touch electrode line D1.

It should be noted that the coupling circuit P1 in fig. 2 is coupled to the touch electrode TP1 in fig. 1 through the touch electrode line D1. In addition, referring to fig. 1, the coupling circuit P2 is coupled to the touch electrode TP2 via the touch electrode line D2. The coupling circuit P3 is coupled to the touch electrode TP3 through the touch electrode line D3. The coupling circuits P4 to P6 are coupled to the touch electrodes below in a manner similar to the coupling circuit P1 coupled to the touch electrode TP1.

Furthermore, the integrated circuit IC/FPC is coupled to the first signal line, the second signal line, the third signal line and the common signal line. The integrated circuit IC/FPC is used to generate the first signal TP _ SW, the second signal TP _ SWC, the third signal TP _ SWB, and the level Com of the voltage Vcom.

In addition, referring to fig. 1 and fig. 2, the circuit architectures of the coupling circuits P2 to P6 in fig. 1 are the same as the circuit architecture of the coupling circuit P1 shown in fig. 2.

In some embodiments, referring to fig. 2, the coupling circuit P1 includes a first transistor T1, a second transistor T2 and a capacitor C1, wherein the first terminal is counted from the top end and the right end of the device in the figure.

In some embodiments, the first transistor T1 includes a first terminal, a second terminal, and a control terminal. A first terminal of the first transistor T1 is coupled to the node N1. The second terminal of the first transistor T1 is coupled to the first signal line (for transmitting the first signal TP _ SW). The control terminal of the first transistor T1 is coupled to the second signal line (for transmitting the second signal TP _ SWC) for transmitting the first signal TP _ SW to the node N1 in response to the second signal TP _ SWC. In some embodiments, referring to fig. 2, the first transistor T1 is a P-type thin-film transistor (PTFT). In practice, the type of the first transistor T1 may be PTFT or NTFT (N-type thin-film transistor), and the type of the first transistor T1 may be designed according to practical requirements, and is not limited to the illustrated embodiment. It should be noted that if the first transistor T1 is NTFT, the electrical property of the second signal TP _ SWC will be opposite.

In some embodiments, referring to fig. 1 and 2, the second transistor T2 includes a first terminal, a second terminal and a control terminal. The first terminal of the second transistor T2 is coupled to a common signal line (for transmitting the level Com of the voltage Vcom). The second terminal of the second transistor T2 is coupled to the touch electrode TP1 through the touch signal line D1. The control terminal of the second transistor T2 is coupled to the node N1. In some embodiments, referring to fig. 2, the second transistor T2 may be NTFT. However, in practice, the type of the second transistor T2 is not limited to PTFT or NTFT, and the type of the second transistor T2 can be designed according to practical requirements, and is not limited to the embodiment shown in the drawings.

In some embodiments, the capacitor C1 includes a first terminal and a second terminal. The first end of the capacitor C1 is coupled to the third signal line (for transmitting the third signal TW _ SWB). The second terminal of the capacitor C1 is coupled to the node N1. When the third signal TW _ SWB changes in the second phase, the capacitor C1 is used to couple the third signal to the node N1, thereby adjusting the first level to the second level of the node N1.

In some embodiments, to make the operation of the coupling circuit P1 of fig. 2 easy to understand, please refer to fig. 3 together. Fig. 3 is a timing diagram of control signals of a touch display device according to some embodiments of the disclosure.

In some embodiments, referring to fig. 2 and 3, during the first phase I1, the first signal TP _ SW and the second signal TP _ SWC are at the high level H. The third signal TP _ SWB is at the low level L. The first transistor T1 of the coupling circuit P1 is turned off in response to the second signal TP _ SWC. The high level H of the first signal TP _ SW cannot be transmitted to the node N1 through the first transistor T1. Therefore, the level state of the node N1 is the low level L at this time.

In some embodiments, referring to fig. 2 and 3, during the second phase I2, the first signal TP _ SW is at high level H. The second signal TP _ SWC and the third signal TP _ SWB are at low level L. The coupling circuit P1 is used for adjusting the node N1 of the coupling circuit P1 to the first level (the high level H of the first signal TP _ SW) according to the first signal TP _ SW and the second signal TP _ SWC in the second stage I2, so as to couple the level Com of the voltage Vcom to the touch electrode line D1.

In some embodiments, the first transistor T1 of the coupling circuit P1 is turned on in response to the second signal TP _ SWC. The high level H of the first signal TP _ SW is transmitted to the node N1 through the first transistor T1. Therefore, the level state of the node N1 is the high level H of the first signal TP _ SW.

In addition, the second transistor T2 is turned on in response to the high level H of the node N1, so that the level Com of the voltage Vcom transmitted by the common signal line is output to the touch electrode TP1 of fig. 1 through the touch electrode line D1.

In some embodiments, referring to fig. 2 and 3, in the third stage I3, the first signal TP _ SW and the third signal TP _ SWB are at the high level H. The second signal TP _ SWC is at the low level L. The coupling circuit P1 is further configured to couple the third signal TP _ SWB to the node N1 at the third stage I3 according to the first signal TP _ SW and the second signal TP _ SWC to adjust the first level (high level H) of the node N1 to the second level (high level HH), and the coupling circuit P1 responds to the level Com of the second level coupling voltage Vcom to the touch electrode line D1.

In some embodiments, the first transistor T1 of the coupling circuit P1 is turned on in response to the second signal TW _ SWC. The high level H of the first signal TP _ SW is continuously transmitted to the node N1 through the first transistor T1. When the third signal TW _ SWB changes from the low level L to the high level H in the third stage I3, the capacitor C1 is used to couple the third signal TW _ SWB to the node N1, so as to adjust the first level (the high level H of the first signal TP _ SW) of the node N1 to the second level (the high level H of the first signal TP _ SW + the high level H of the third signal TW _ SWB).

In addition, the second transistor T2 is turned on in response to the high level H of the node N1, so that the level Com of the voltage Vcom transmitted by the common signal line is output to the touch electrode TP1 of fig. 1 through the touch electrode line D1. In some embodiments, the second level is 1.5 times or 1.75 times the original first level, which is approximately twice the original first level.

It should be noted that, referring to fig. 1 to fig. 3, when the potential of the second level is increased to be close to twice the potential of the first level, at this time, the conduction capability of the second transistor T2 is increased, so that the current transmitted by the common signal line flows into the touch electrode line D1 to be increased, and the recovery capability of the touch electrode TP1 of fig. 1 is increased.

Further, the restorability of the touch electrode TP1 refers to the ability of the touch electrode to be easily affected by the capacitance and resistance oscillations in the circuit when the touch display device 100 goes through the display stage and the touch stage and the pixels of the touch display device 100 have high resolution (i.e., a high number of pixels), and the charging time of the touch electrode is reduced. In other words, the present coupling circuit increases the recovery capability of the touch electrode, so that the touch electrode is not easily affected by the oscillation of the resistance and capacitance in the circuit, and the touch electrode is maintained in normal circuit operation.

In some embodiments, referring to fig. 2 and 3, during the fourth phase I4, the first signal TP _ SW is at high level H. The second signal TP _ SWC and the third signal TP _ SWB are at the low level L. When the third signal TW _ SWB changes from the high level H to the low level L in the fourth phase I4, the capacitor C1 of the coupling circuit P1 cannot couple the high level H of the third signal TP _ SWB to the node N1. At this time, the second level of the node N1 is restored to the first level (the high level H of the first signal TP _ SW).

In some embodiments, referring to fig. 2 and 3, during the fifth phase I5, the first signal TP _ SW and the second signal TP _ SWC are at the high level H. The third signal TP _ SWB is at the low level L. The control terminal of the first transistor T1 of the coupling circuit P1 is turned off in response to the second signal TP _ SWC, so that the high level H of the first signal TP _ SW cannot be transmitted to the node N1 through the first transistor T1.

In some embodiments, referring to fig. 2 and 3, during the sixth phase I6, the first signal TP _ SW and the third signal TP _ SWB are at the low level L. The second signal TP _ SWC is at high level H. The coupling circuit P1 cannot transmit the first signal TP _ SW to the node N1.

In some embodiments, the third stage I3 is a display stage of the touch display device 100 of fig. 1. The sixth stage I6 is a touch stage of the touch display device 100 in fig. 1. The first to sixth stages I1 to I6 are a unit period. The touch display device 100 will repeat the first stage I1 to the sixth stage I6.

Fig. 4 is a block diagram illustrating a circuit of a touch display device 200 according to some embodiments of the disclosure. In some embodiments, compared to fig. 1, the embodiment of fig. 4 is different from fig. 1 in that a signal transmitted by the second signal line (for transmitting the second signal TP _ SWC) of fig. 1 is derived from the signal Goff of the shift register SR, and the rest of the structures are similar to the touch display device 100 of fig. 1, which is not repeated herein.

In some embodiments, referring to fig. 4, the touch display device 200 further includes a shift register SR. The shift register SR is coupled to the second signal line (for transmitting the signal Goff) and the integrated circuit IC/FPC. The shift register SR is configured to generate a signal Goff according to the second signal TP _ SWC. The signal Goff and the first signal TP _ SW are the same direction signal or the opposite direction signal.

Fig. 5 is a timing diagram of control signals of a touch display device according to some embodiments of the disclosure. In some embodiments, the signal Goff is a same-direction signal as the first signal TP _ SW. The timing diagram of the control signals of the embodiment of fig. 5 is similar to the timing diagram of the control signals of the embodiment of fig. 3, and is not repeated herein.

Fig. 6 is a timing diagram of control signals of a touch display device according to some embodiments of the disclosure. In some embodiments, the signal Goff and the first signal TP _ SW are inverse signals. In some embodiments, the difference between the embodiment of fig. 6 and the embodiments of fig. 3 and 5 is that during the first stage I1 and the fifth stage I5, the signal Goff is low, which causes the first transistor T1 of the coupling circuit P1 of fig. 2 to be turned on, and the node N1 of the coupling circuit P1 of fig. 2 is at the first level (the high level H of the first signal TP _ SW) during the first stage I1 and the fifth stage I5.

Fig. 7 is a block diagram illustrating a circuit of a touch display device 300 according to some embodiments of the disclosure. In some embodiments, the touch display device 300 includes a first signal line, a second signal line, a common signal line, and a coupling circuit (e.g., the coupling circuit P7 to the coupling circuit P12). The first signal line is used for transmitting a first signal TP _ SW. The second signal line is used for transmitting a second signal TP _ SWC. The first signal TP _ SW and the second signal TP _ SWC are different. The common signal line is used for transmitting the low level and the high level of the common electrode signal Vcom _ TP. The coupling circuits (e.g., the coupling circuits P7 to P12) are coupled to the first signal line, the second signal line and the common signal line.

In order to make the structure of the coupling circuit easy to understand, please refer to fig. 8, fig. 8 is a schematic circuit block diagram of a coupling circuit P7 of a touch display device according to some embodiments of the present disclosure, in which the coupling circuit P7 is used to adjust a node N1 of the coupling circuit P7 to a first level according to low levels of a first signal TP _ SW, a second signal TP _ SWC and a common electrode signal Vcom _ TP, so as to couple the low level of the common electrode signal Vcom _ TP to a touch electrode line D1. The coupling circuit P7 is further configured to adjust the first level to the second level of the node N1 according to the high levels of the first signal TP _ SW, the second signal TP _ SWC and the common electrode signal Vcom _ TP in the second stage. The coupling circuit P7 couples the high level of the common electrode signal Vcom _ TP to the touch electrode line D1 in response to the second level.

It should be noted that the coupling circuit P7 of fig. 8 is coupled to the touch electrode TP1 of fig. 7 through the touch electrode line D1. In addition, referring to fig. 7, the coupling circuit P8 is coupled to the touch electrode TP2 through the touch electrode line D2. The coupling circuit P9 is coupled to the touch electrode TP3 through the touch electrode line D3. The coupling circuits P10 and P12 are coupled to the touch electrodes below in a similar manner to the coupling circuit P7 coupled to the touch electrode TP1.

Furthermore, the integrated circuit IC/FPC is coupled to the first signal line, the second signal line, the third signal line and the common signal line. The integrated circuit IC/FPC is used to generate a first signal TP _ SW, a second signal TP _ SWC, and a common electrode signal Vcom _ TP.

In addition, referring to fig. 7 and 8, the circuit architectures of the coupling circuits P8 to P12 in fig. 7 are the same as the circuit architecture of the coupling circuit P7 shown in fig. 8.

In some embodiments, the coupling circuit P7 includes a first transistor T1 and a second transistor T2, in some embodiments, the first end of the device is counted from the top end and the right end of the device in the figure.

In some embodiments, the first transistor T1 includes a first terminal, a second terminal, and a control terminal. A first terminal of the first transistor T1 is coupled to the node N1. The control terminal of the first transistor T1 is coupled to the second signal line (for transmitting the second signal TP _ SWC). The second terminal of the first transistor T1 is coupled to the first signal line for transmitting the first signal TP _ SW to the node N1. In some embodiments, referring to fig. 8, the first transistor T1 may be a PTFT. In practice, however, the type of the first transistor T1 is not limited to PTFT or NTFT, and the type of the first transistor T1 can be designed according to practical requirements, and is not limited to the illustrated embodiment.

In some embodiments, referring to fig. 7 and 8, the second transistor T2 includes a first terminal, a second terminal and a control terminal. The first terminal of the second transistor T2 is coupled to a common signal line (for transmitting a common electrode signal Vcom _ TP). The second terminal of the second transistor T2 is coupled to the touch electrode TP1 through the touch signal line D1. A control terminal of the second transistor T2 is coupled to the node N1. In some embodiments, referring to fig. 8, the second transistor T2 may be NTFT. However, in practice, the type of the second transistor T2 is not limited to PTFT or NTFT, and the type of the second transistor T2 can be designed according to practical requirements, and is not limited to the embodiment shown in the drawings.

In some embodiments, the second transistor T2 includes a parasitic capacitance C2. The parasitic capacitor C2 is coupled to the first terminal of the second transistor T2 and the control terminal of the second transistor T2. When the common electrode signal Vcom _ TP is raised from the low level to the high level in the second stage, the parasitic capacitor C2 is used for coupling the high level of the common electrode signal Vcom _ TP to the node N1, thereby adjusting the first level of the node N1 to the second level.

In some embodiments, to make the operation of the coupling circuit P7 of fig. 8 easy to understand, please refer to fig. 9 together. Fig. 9 is a timing diagram of control signals of a touch display device according to some embodiments of the disclosure.

In some embodiments, referring to fig. 8 and 9, during the first phase I1, the first signal TP _ SW and the second signal TP _ SWC are at the high level H. The first transistor T1 of the coupling circuit P7 is turned off in response to the second signal TP _ SWC. The first signal TP _ SW has a high level H and cannot be transmitted to the node N1 through the first transistor T1. Therefore, the level state of the node N1 is the low level L at this time.

In some embodiments, referring to fig. 8 and 9, during the second phase I2, the first signal TP _ SW is at high level H. The second signal TP _ SWC is at the low level L. The coupling circuit P7 is used for adjusting the node N1 of the coupling circuit P7 to the first level according to the first signal TP _ SW, the second signal TP _ SWC and the low level Com-L of the common electrode signal Vcom _ TP at the second stage I2, so as to couple the low level Com-L of the common electrode signal Vcom _ TP to the touch electrode line D1.

In some embodiments, the first transistor T1 of the coupling circuit P7 is turned on in response to the second signal TP _ SWC. The high level H of the first signal TP _ SW is transmitted to the node N1 through the first transistor T1. Therefore, the level state of the node N1 is the high level H of the first signal TP _ SW.

In addition, the second transistor T2 is turned on in response to the high level H of the node N1, so that the low level Com-L of the common electrode signal Vcom _ TP transmitted by the common signal line is output to the touch electrode TP1 of fig. 7 through the touch electrode line D1.

In some embodiments, referring to fig. 8 and 9, in the third stage I3, the first signal TP _ SW is at the high level H. The second signal TP _ SWC is at the low level L. The coupling circuit P7 is further configured to adjust the first level (high level H) to the second level (high level HH) of the node N1 according to the high level Com of the first signal TP _ SW, the second signal TP _ SWC and the common electrode signal Vcom _ TP in the third stage I3. The coupling circuit P7 couples the high level Com-H of the common electrode signal Vcom _ TP to the touch electrode line D1 in response to the second level.

In some embodiments, the first transistor T1 of the coupling circuit P7 is turned on in response to the second signal TW _ SWC. The high level H of the first signal TP _ SW is continuously transmitted to the node N1 through the first transistor T1. When the common electrode signal Vcom _ TP changes from the low level Com-L to the high level Com-H in the third stage I3, the common electrode signal Vcom _ TP is coupled to the node N1 of the coupling circuit P7 through the parasitic capacitor C2 of the second transistor T2, so as to adjust the first level (the high level H of the first signal TP _ SW) of the node N1 to the second level (the high level H of the first signal TP _ SW + the high level Com-H of the common electrode signal Vcom _ TP).

In addition, the second transistor T2 is turned on in response to the high level H of the node N1, so that the high level Com-H of the common electrode signal Vcom _ TP transmitted by the common signal line is output to the touch electrode TP1 of fig. 7 through the touch electrode line D1. In some embodiments, the second level is 1.5 times or 1.75 times the original first level, which is approximately twice the original first level.

In some embodiments, referring to fig. 8 and 9, during the fourth phase I4, the first signal TP _ SW is at high level H. The second signal TP _ SWC is at the low level L. When the common electrode signal Vcom _ TP changes from the high level Com-H to the low level Com-L in the fourth stage I4, the parasitic capacitor C2 of the second transistor T2 of the coupling circuit P7 cannot couple the high level Com-H of the common electrode signal Vcom _ TP to the node N1. At this time, the second level of the node N1 is restored to the first level (the high level H of the first signal TP _ SW).

In some embodiments, referring to fig. 8 and 9, during the fifth phase I5, the first signal TP _ SW and the second signal TP _ SWC are at the high level H. The control terminal of the first transistor T1 of the coupling circuit P7 is turned off in response to the second signal TP _ SWC, and therefore, the high level H of the first signal TP _ SW cannot be transmitted to the node N1 through the first transistor T1.

In some embodiments, referring to fig. 8 and 9, in the sixth phase I6, the first signal TP _ SW is at the low level L. The second signal TP _ SWC is high level H. The coupling circuit P7 cannot transmit the first signal TP _ SW to the node N1.

In some embodiments, the third stage I3 is a display stage of the touch display device 300 of fig. 7. The sixth stage I6 is a touch stage of the touch display device 300 of fig. 7. The first to sixth stages I1 to I6 are a unit period. The touch display device 300 will repeat the first stage I1 to the sixth stage I6.

Fig. 10 is a block diagram illustrating a circuit of a touch display device 400 according to some embodiments of the disclosure. In some embodiments, compared to fig. 7, the embodiment of fig. 10 differs from fig. 7 in that the signal transmitted by the second signal line (for transmitting the second signal TP _ SWC) of fig. 7 is derived from the signal Goff of the shift register SR, and the rest of the structure is similar to that of the touch display device 300 of fig. 1, which is not repeated herein.

In some embodiments, referring to fig. 10, the touch display device 400 further includes a shift register SR. The shift register SR is coupled to the second signal line (for transmitting signal Goff) and the integrated circuit IC/FPC. The shift register SR generates a signal Goff according to the second signal TP _ SWC. The signal Goff and the first signal TP _ SW are the same direction signal or the opposite direction signal.

Fig. 11 is a timing diagram of control signals of a touch display device according to some embodiments of the disclosure. In some embodiments, the signal Goff is the same direction signal as the first signal TP _ SW. The timing diagram of the control signals of the embodiment of fig. 11 is similar to the timing diagram of the control signals of the embodiment of fig. 9, and is not repeated herein.

Fig. 12 is a timing diagram of control signals of a touch display device according to some embodiments of the disclosure. In some embodiments, the signal Goff and the first signal TP _ SW are inverse signals. In some embodiments, the difference between the embodiment of fig. 12 and the embodiments of fig. 9 and 11 is that the common electrode signal Vcom _ TP is at the low level Com-L in the first stage I1 and the fifth stage I5, so that the node N1 of the coupling circuit P7 of fig. 8 is at the low level L, and the first signal TP _ SW is gradually input to the node N1 of the coupling circuit P7 in the second stage I2 and the fourth stage I4, so that the node N1 is at the high level H.

It should be noted that the parasitic circuit C2 of the second transistor T2 in fig. 8 has a limited coupling effect, and therefore the high level H of the node N1 mainly affected by the first signal TP _ SW changes.

According to the foregoing embodiments, a touch display device is provided to increase the recovery capability of a touch electrode through a coupling circuit, and in particular, to make the touch electrode less susceptible to the resistance-capacitance oscillation in a circuit through the coupling circuit, so that the touch electrode is maintained in a normal circuit operation.

Although the present disclosure has been described with reference to particular embodiments, other possible implementations are not excluded. Therefore, the protection scope of the present application shall be defined by the appended claims rather than the limitations of the foregoing embodiments.

It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof. All changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. A touch display device, comprising:

a first signal line for transmitting a first signal;

a second signal line for transmitting a second signal;

a third signal line for transmitting a third signal, wherein the first signal, the second signal and the third signal are different;

a common signal line for transmitting a level of a voltage; and

a coupling circuit coupled to the first signal line, the second signal line, the third signal line and the common signal line, wherein the coupling circuit is configured to adjust a node of the coupling circuit to a first level according to the first signal and the second signal in a first stage, so as to couple the level of the voltage to a touch electrode line, wherein the coupling circuit is further configured to couple the third signal to the node according to the first signal and the second signal in a second stage, so as to adjust the first level to a second level of the node, wherein the coupling circuit is configured to couple the level of the voltage to the touch electrode line in response to the second level.

2. The touch display device of claim 1, wherein the coupling circuit comprises:

a first transistor including a first terminal, a second terminal, and a control terminal, wherein the first terminal of the first transistor is coupled to the node, the second terminal of the first transistor is coupled to the first signal line, and the control terminal of the first transistor is coupled to the second signal line, so as to transmit the first signal to the node; and

a second transistor including a first terminal, a second terminal, and a control terminal, wherein the first terminal of the second transistor is coupled to the common signal line, the second terminal of the second transistor is coupled to a touch electrode through the touch signal line, and the control terminal of the second transistor is coupled to the node, wherein the second transistor transmits the level of the voltage to the touch electrode line in response to the first level at the first stage, and transmits the level of the voltage to the touch electrode line in response to the second level at the second stage.

3. The touch display device of claim 2, wherein the coupling circuit further comprises:

a capacitor including a first end and a second end, wherein the first end of the capacitor is coupled to the third signal line, and the second end of the capacitor is coupled to the node, wherein when the third signal changes at the second stage, the capacitor is configured to couple the third signal to the node, thereby adjusting the first level to the second level of the node.

4. The touch display device of claim 1, further comprising:

an integrated circuit coupled to the first signal line, the second signal line, the third signal line and the common signal line, wherein the integrated circuit is configured to generate the first signal, the second signal, the third signal and the level of the voltage.

5. The touch display device of claim 4, further comprising:

and a shift register coupled to the second signal line and the integrated circuit and configured to generate a fourth signal according to the second signal, wherein the fourth signal and the first signal are a same-direction signal or a reverse-direction signal.

6. A touch display device, comprising:

a first signal line for transmitting a first signal;

a second signal line for transmitting a second signal, wherein the first signal is different from the second signal;

a common signal line for transmitting a low level and a high level of a common electrode signal; and

a coupling circuit coupled to the first signal line, the second signal line, and the common signal line, wherein the coupling circuit is configured to adjust a node of the coupling circuit to a first level according to the low level of the first signal, the second signal, and the common electrode signal in a first phase to couple the low level of the common electrode signal to a touch electrode line, wherein the coupling circuit is further configured to adjust the first level of the node to a second level according to the high level of the first signal, the second signal, and the common electrode signal in a second phase, wherein the coupling circuit is configured to couple the high level of the common electrode signal to the touch electrode line in response to the second level.

7. The touch display device of claim 6, wherein the coupling circuit comprises:

a first transistor including a first terminal, a second terminal, and a control terminal, wherein the first terminal of the first transistor is coupled to the node, the control terminal of the first transistor is coupled to the second signal line, and the second terminal of the first transistor is coupled to the first signal line for transmitting the first signal to the node; and

a second transistor including a first terminal, a second terminal, and a control terminal, wherein the first terminal of the second transistor is coupled to the common signal line, the second terminal of the second transistor is coupled to a touch electrode through the touch signal line, and the control terminal of the second transistor is coupled to the node, wherein the second transistor transmits the low level of the common electrode signal to the touch electrode line in response to the first level at the first stage, and transmits the high level of the common electrode signal to the touch electrode line in response to the second level at the second stage.

8. The touch display device of claim 7, wherein the second transistor comprises:

and a parasitic capacitor coupled to the first terminal of the second transistor and the control terminal of the second transistor, wherein when the common electrode signal is raised from the low level to the high level at the second stage, the parasitic capacitor is configured to couple the high level of the common electrode signal to the node, thereby adjusting the first level of the node to the second level.

9. The touch display device of claim 6, further comprising:

an integrated circuit coupled to the first signal line, the second signal line, and the common signal line, wherein the integrated circuit is configured to generate the first signal, the second signal, and the common signal.

10. The touch display device of claim 9, further comprising:

and a shift register coupled to the second signal line and the integrated circuit and configured to generate a third signal according to the second signal, wherein the third signal and the first signal are a same-direction signal or a reverse-direction signal.