Touch display device

Abstract

A touch display device includes 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 not the same. The common signal line transmits a voltage level. 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 adjusts 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 voltage level to a touch electrode line. The coupling circuit couples 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 of the node to a second level. The coupling circuit couples the voltage level to the touch electrode line in response to the second level.

Description

Technical Field

[0001] This case relates to a display device. More specifically, this case relates to a touch display device. Background Technology

[0002] In existing touch display devices, the increased size of the panel and gate controller in in-cell touch panel technology leads to insufficient recovery capability of the touch electrodes. The touch electrodes are susceptible to oscillations of resistors and capacitors in the circuit, which in turn affects the display screen of the touch display device.

[0003] In addition, if the control voltage of the touch electrode is directly increased to solve the problem of the touch electrode's recovery capability, the display screen of the touch display device will have display defects (mura), and the power consumption of the touch display device will increase.

[0004] Therefore, the above-mentioned technologies still have many shortcomings, and it is up to practitioners in the field to develop other suitable circuit designs for touch display devices. Summary of the Invention

[0005] One aspect of this application relates to a touch display device. The touch display device includes 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, second, and third signals are all different. The common signal line transmits a voltage level. The coupling circuit is coupled to the first, second, third, and common signal lines. In a first stage, the coupling circuit adjusts a node of the coupling circuit to a first level based on the first and second signals, thereby coupling the voltage level to the touch electrode line. In a second stage, the coupling circuit further couples the third signal to a node based on the first and second signals, thereby adjusting the first level of the node to a second level. The coupling circuit responds to the second level by coupling the voltage level to the touch electrode line.

[0006] Another aspect of this case relates to a touch display device. The touch display device includes a first signal line, a second 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 first signal and the second signal are different. The common signal line transmits a low level and a high level of a common electrode signal. The coupling circuit is coupled to the first signal line, the second signal line, and the common signal line. In a first stage, the coupling circuit adjusts its node to a first level based on the low level of the first signal, the second signal, and the common electrode signal, thereby coupling the low level of the common electrode signal to the touch electrode line. In a second stage, the coupling circuit further adjusts the first level of the node to a second level based on the high level of the first signal, the second signal, and the common electrode signal. The coupling circuit, in response to the second level, couples the high level of the common electrode signal to the touch electrode line. Attached Figure Description

[0007] The following paragraphs describing the implementation methods and the diagrams below will provide a better understanding of the content of this case: Figure 1 This is a circuit block diagram of a touch display device illustrated according to some embodiments of this case; Figure 2 This is a circuit block diagram illustrating the coupling circuit of a touch display device according to some embodiments of this case; Figure 3 This is a schematic diagram of the control signal timing of a touch display device according to some embodiments of this case; Figure 4 This is a circuit block diagram of a touch display device illustrated according to some embodiments of this case; Figure 5 This is a schematic diagram of the control signal timing of a touch display device according to some embodiments of this case; Figure 6 This is a schematic diagram of the control signal timing of a touch display device according to some embodiments of this case; Figure 7 This is a circuit block diagram of a touch display device illustrated according to some embodiments of this case; Figure 8 This is a circuit block diagram illustrating the coupling circuit of a touch display device according to some embodiments of this case; Figure 9 This is a schematic diagram of the control signal timing of a touch display device according to some embodiments of this case; Figure 10 This is a circuit block diagram of a touch display device illustrated according to some embodiments of this case; Figure 11 A timing diagram of control signals for a touch display device illustrated according to some embodiments of this case; and Figure 12This is a schematic diagram of the control signal timing of a touch display device according to some embodiments of this case.

[0008] The reference numerals in the attached figures are explained as follows: TP_SW: First signal TP_SWC: Second signal TP_SWB: Third signal Goff: Signal Vcom: Voltage Vcom_TP: Common electrode signal P1~P12: Coupling circuit T1: First transistor T2: Second transistor C1: Capacitor C2: Parasitic capacitance N1: Node D1: Touch electrode wire SR: Shift Register IC / FPC: Integrated Circuits TP1~TP3: Touch electrodes D1~D3: Touch electrode wires H: High level L: Low level Com-H: High level of common electrode signal Com: Level Com-L: Low level of common electrode signal HH: Higher Level I1~I8: Stages Detailed Implementation

[0009] The spirit of this case will be clearly explained below with diagrams and detailed description. Anyone skilled in the art can make changes and modifications based on the technology taught in this case after understanding the embodiments of this case, without departing from the spirit and scope of this case.

[0010] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0011] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0012] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific content of this case. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.

[0013] Figure 1 This is a circuit block diagram illustrating a touch display device 100 according to some embodiments of the present invention. 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 coupling circuits (e.g., coupling circuits P1 to P6). The first signal line is used to transmit a first signal TP_SW. The second signal line is used to transmit a second signal TP_SWC. The third signal line is used to transmit 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 to transmit the level Com of the voltage Vcom. The coupling circuits (e.g., 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.

[0014] To make the structure of the coupling circuit in this case easier to understand, please refer to the following: Figure 2 , Figure 2 This is a circuit block diagram illustrating the coupling circuit P1 of a touch display device according to some embodiments of the present invention. In a first stage, the coupling circuit P1 adjusts node N1 to a first level according to a first signal TP_SW and a second signal TP_SWC, thereby coupling the level Com of voltage Vcom to the touch electrode line D1. In a second stage, the coupling circuit P1 further couples a third signal TP_SWB to node N1 according to the first signal TP_SW and the second signal TP_SWC, thereby adjusting the first level of node N1 to a second level. In response to the second level, the coupling circuit P1 couples the level Com of voltage Vcom to the touch electrode line D1.

[0015] It should be noted that, Figure 2 The coupling circuit P1 is coupled to the touch electrode line D1. Figure 1 The touch electrode TP1. Also, please refer to... Figure 1 Coupler circuit P2 is coupled to touch electrode TP2 via touch electrode line D2. Coupler circuit P3 is coupled to touch electrode TP3 via touch electrode line D3. The remaining coupling circuits P4 to P6 are coupled to the multiple touch electrodes below in a similar manner to coupling circuit P1 to touch electrode TP1.

[0016] 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.

[0017] In addition, please see Figure 1 and Figure 2 , Figure 1 The circuit architectures of coupling circuits P2 to P6 are all the same as those shown below. Figure 2 The circuit architecture of the coupling circuit P1 is shown.

[0018] In some embodiments, please refer to Figure 2 Please count the first end from the top and right ends of the components in the diagram. The coupling circuit P1 includes the first transistor T1, the second transistor T2, and the capacitor C1.

[0019] In some embodiments, the first transistor T1 includes a first terminal, a second terminal, and a control terminal. The first terminal of the first transistor T1 is coupled to node N1. The second terminal of the first transistor T1 is coupled to a first signal line (for transmitting a first signal TP_SW). The control terminal of the first transistor T1 is coupled to a second signal line (for transmitting a second signal TP_SWC), thereby transmitting the first signal TP_SW to node N1 in response to the second signal TP_SWC. In some embodiments, please refer to... Figure 2 The first transistor T1 is a P-type thin-film transistor (PTFT). However, in practice, the first transistor T1 can be either a PTFT or an NTFT (N-type thin-film transistor). The type of the first transistor T1 can be designed according to actual needs and is not limited to the illustrated embodiment. It should be noted that if the first transistor T1 is an NTFT, the electrical characteristics of the second signal TP_SWC will be reversed.

[0020] In some embodiments, please refer to Figure 1 and Figure 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 (used to transmit the level Com of voltage Vcom). The second terminal of the second transistor T2 is coupled to a touch electrode TP1 via a touch electrode line D1. The control terminal of the second transistor T2 is coupled to node N1. In some embodiments, please refer to... Figure 2 The second transistor T2 can be an NTFT. However, in practice, the type of the second transistor T2 is not limited to PTFT or NTFT. The type of the second transistor T2 can be designed according to actual needs and is not limited to the illustrated embodiment.

[0021] In some embodiments, capacitor C1 includes a first terminal and a second terminal. The first terminal of capacitor C1 is coupled to a third signal line (for transmitting a third signal TW_SWB). The second terminal of capacitor C1 is coupled to node N1. When the third signal TW_SWB changes in the second stage, capacitor C1 is used to couple the third signal to node N1, thereby adjusting the first level of node N1 to the second level.

[0022] In some embodiments, to enable Figure 2 The operation of the coupling circuit P1 is easy to understand; please refer to [the relevant documentation]. Figure 3 . Figure 3 This is a schematic diagram of the control signal timing of a touch display device according to some embodiments of this case.

[0023] In some embodiments, please refer to Figure 2 and Figure 3 In the first stage I1, the first signal TP_SW and the second signal TP_SWC are at a high level (H). The third signal TP_SWB is at a low level (L). The first transistor T1 of the coupling circuit P1 turns off in response to the second signal TP_SWC. The high level (H) of the first signal TP_SW cannot be transmitted to node N1 through the first transistor T1. Therefore, the level state of node N1 is at a low level (L) at this time.

[0024] In some embodiments, please refer to Figure 2 and Figure 3 In the second stage I2, the first signal TP_SW is at a high level H. The second signal TP_SWC and the third signal TP_SWB are at a low level L. In the second stage I2, the coupling circuit P1 is used to adjust 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, so as to couple the level Com of the voltage Vcom to the touch electrode line D1.

[0025] 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 node N1 through the first transistor T1. Therefore, the level state of node N1 at this time is the high level H of the first signal TP_SW.

[0026] Furthermore, the second transistor T2 responds to the high level H of node N1, thereby causing the level Com of the voltage Vcom transmitted on the common signal line to be output through the touch electrode line D1. Figure 1 The touch electrode TP1.

[0027] In some embodiments, please refer to Figure 2 and Figure 3In the third stage I3, the first signal TP_SW and the third signal TP_SWB are at a high level H. The second signal TP_SWC is at a low level L. The coupling circuit P1 is further used in the third stage I3 to couple the third signal TP_SWB to node N1 according to the first signal TP_SW and the second signal TP_SWC, so as to adjust the first level (high level H) of node N1 to the second level (higher level HH). The coupling circuit P1 responds to the level Com of the second level coupling voltage Vcom to the touch electrode line D1.

[0028] 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 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, capacitor C1 is used to couple the third signal TW_SWB to node N1, thereby adjusting the first level (the high level H of the first signal TP_SW) of 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).

[0029] Furthermore, the second transistor T2 responds to the high level H of node N1, thereby causing the level Com of the voltage Vcom transmitted on the common signal line to be output through the touch electrode line D1. Figure 1 The touch electrode TP1. In some embodiments, the second level is 1.5 times or 1.75 times the original first level, which is close to twice the original first level.

[0030] It should be noted that you can refer to [link / reference]. Figures 1 to 3 When the potential of the second level increases to nearly twice that of the first level, the conduction capability of the second transistor T2 increases, causing an increase in the current flowing into the touch electrode line D1 via the common signal line, thus... Figure 1 The recovery capability of the touch electrode TP1 is increased.

[0031] To further clarify, the recovery capability of the touch electrode TP1 refers to its ability to withstand the effects of resistor and capacitor oscillations in the circuit when the touch display device 100 undergoes both the display and touch phases, and when the pixels of the touch display device 100 are high-resolution (i.e., a high number of pixels). In other words, the coupling circuit in this invention increases the recovery capability of the touch electrode, making it less susceptible to resistor and capacitor oscillations in the circuit, thus allowing the touch electrode to maintain normal circuit operation.

[0032] In some embodiments, please refer to Figure 2 and Figure 3In stage I4, the first signal TP_SW is at a high level (H). The second signal TP_SWC and the third signal TP_SWB are at a low level (L). When the third signal TP_SWB changes from a high level (H) to a low level (L) in stage I4, capacitor C1 of coupling circuit P1 cannot couple the high level (H) of the third signal TP_SWB to node N1. At this time, the second level of node N1 returns to the first level (the high level (H) of the first signal TP_SW).

[0033] In some embodiments, please refer to Figure 2 and Figure 3 In the fifth stage I5, the first signal TP_SW and the second signal TP_SWC are at a high level (H). The third signal TP_SWB is at a low level (L). The control terminal of the first transistor T1 in the coupling circuit P1 is turned off in response to the second signal TP_SWC. Therefore, the high level (H) of the first signal TP_SW cannot be transmitted to node N1 through the first transistor T1.

[0034] In some embodiments, please refer to Figure 2 and Figure 3 During stage I6, the first signal TP_SW and the third signal TP_SWB are at a low level (L). The second signal TP_SWC is at a high level (H). The coupling circuit P1 cannot transmit the first signal TP_SW to node N1.

[0035] In some embodiments, the third stage I3 is Figure 1 The display stage of the touch display device 100. The sixth stage I6 is... Figure 1 The touch display device 100 has a touch phase. The first phase I1 to the sixth phase I6 constitute one unit cycle. The touch display device 100 will continuously repeat the first phase I1 to the sixth phase I6.

[0036] Figure 4 This is a circuit block diagram illustrating a touch display device 200 according to some embodiments of this invention. In some embodiments, compared to Figure 1 , Figure 4 Implementation examples and Figure 1 The difference lies in Figure 1 The second signal line (used to transmit the second signal TP_SWC) transmits a signal from the shift register SR, Goff. The rest of the structure is similar. Figure 1 The touch display device 100 will not be described in detail here.

[0037] In some embodiments, please refer to Figure 4The touch display device 200 further includes a shift register SR. The shift register SR is coupled to a second signal line (used to transmit the signal Goff) and an integrated circuit IC / FPC. The shift register SR is used to generate the signal Goff according to the second signal TP_SWC. The signal Goff and the first signal TP_SW are either in the same direction or in opposite directions.

[0038] Figure 5 This is a schematic diagram illustrating the control signal timing of a touch display device according to some embodiments of the present invention. In some embodiments, the signal Goff and the first signal TP_SW are signals in the same direction. Figure 5 The control signal timing diagram of the embodiment and Figure 3 The control signal timing diagrams of the embodiments are similar and will not be described in detail here.

[0039] Figure 6 This is a timing diagram of control signals for a touch display device according to some embodiments of the present invention. In some embodiments, the signal Goff and the first signal TP_SW are inverted signals. In some embodiments, Figure 6 Implementation examples and Figure 3 and Figure 5 The difference in the embodiment is that during the first stage I1 and the fifth stage I5, the signal Goff is at a low level, resulting in Figure 2 The first transistor T1 of the coupling circuit P1 is turned on. Figure 2 The node N1 of the coupling circuit P1 is at the first level (high level H of the first signal TP_SW) in the first stage I1 and the fifth stage I5.

[0040] Figure 7 This is a circuit block diagram illustrating a touch display device 300 according to some embodiments of the present invention. In some embodiments, the touch display device 300 includes a first signal line, a second signal line, a common signal line, and coupling circuits (e.g., coupling circuits P7 to P12). The first signal line is used to transmit a first signal TP_SW. The second signal line is used to transmit a second signal TP_SWC. The first signal TP_SW and the second signal TP_SWC are different. The common signal line is used to transmit the low and high levels of the common electrode signal Vcom_TP. The coupling circuits (e.g., coupling circuits P7 to P12) are coupled to the first signal line, the second signal line, and the common signal line.

[0041] To make the structure of the coupling circuit in this case easier to understand, please refer to the following: Figure 8 , Figure 8The diagram illustrates a circuit block diagram of the coupling circuit P7 of a touch display device according to some embodiments of this invention. In a first stage, the coupling circuit P7 adjusts node N1 to a first level based on the low level of the first signal TP_SW, the second signal TP_SWC, and the common electrode signal Vcom_TP, thereby coupling the low level of the common electrode signal Vcom_TP to the touch electrode line D1. In a second stage, the coupling circuit P7 further adjusts the first level of node N1 to a second level based on the high level of the first signal TP_SW, the second signal TP_SWC, and the common electrode signal Vcom_TP. In response to the second level, the coupling circuit P7 couples the high level of the common electrode signal Vcom_TP to the touch electrode line D1.

[0042] It should be noted that, Figure 8 The coupling circuit P7 is coupled to the touch electrode line D1. Figure 7 The touch electrode TP1. Also, please refer to... Figure 7 Coupler circuit P8 is coupled to touch electrode TP2 via touch electrode line D2. Coupler circuit P9 is coupled to touch electrode TP3 via touch electrode line D3. The remaining coupling circuits P10 to P12 are coupled to the multiple touch electrodes below in a similar manner to coupling circuit P7 to touch electrode TP1.

[0043] 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, and the common electrode signal Vcom_TP.

[0044] In addition, please see Figure 7 and Figure 8 , Figure 7 The circuit architectures of coupling circuits P8 to P12 are all the same as those shown below. Figure 8 The circuit architecture of the coupling circuit P7 is shown.

[0045] In some embodiments, the first end is counted from the top and right ends of the elements in the diagram, and the coupling circuit P7 includes a first transistor T1 and a second transistor T2.

[0046] In some embodiments, the first transistor T1 includes a first terminal, a second terminal, and a control terminal. The first terminal of the first transistor T1 is coupled to node N1. The control terminal of the first transistor T1 is coupled to a second signal line (for transmitting a second signal TP_SWC). The second terminal of the first transistor T1 is coupled to the first signal line to transmit the first signal TP_SW to node N1. In some embodiments, please refer to... Figure 8The first transistor T1 can be a PTFT. However, in practice, the type of the first transistor T1 is not limited to PTFT or NTFT. The type of the first transistor T1 can be designed according to actual needs and is not limited to the illustrated embodiment.

[0047] In some embodiments, please refer to Figure 7 and Figure 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 the common electrode signal Vcom_TP). The second terminal of the second transistor T2 is coupled to the touch electrode TP1 via the touch electrode line D1. The control terminal of the second transistor T2 is coupled to node N1. In some embodiments, please refer to... Figure 8 The second transistor T2 can be an NTFT. However, in practice, the type of the second transistor T2 is not limited to PTFT or NTFT. The type of the second transistor T2 can be designed according to actual needs and is not limited to the illustrated embodiment.

[0048] In some embodiments, the second transistor T2 includes a parasitic capacitance C2. The parasitic capacitance C2 is coupled to a first terminal of the second transistor T2 and a control terminal of the second transistor T2. When the common electrode signal Vcom_TP rises from a low level to a high level in the second stage I2, the parasitic capacitance C2 is used to couple the high level of the common electrode signal Vcom_TP to node N1, thereby adjusting the first level of node N1 to the second level in the third stage I3.

[0049] In some embodiments, to enable Figure 8 The operation of the coupling circuit P7 is easy to understand; please refer to it as well. Figure 9 . Figure 9 This is a schematic diagram of the control signal timing of a touch display device according to some embodiments of this case.

[0050] In some embodiments, please refer to Figure 8 and Figure 9 In the first stage I1, the first signal TP_SW and the second signal TP_SWC are at a high level H. The first transistor T1 of the coupling circuit P7 turns off in response to the second signal TP_SWC. The high level H of the first signal TP_SW cannot be transmitted to node N1 through the first transistor T1. Therefore, the level state of node N1 is at a low level L at this time.

[0051] In some embodiments, please refer to Figure 8 and Figure 9In the second stage I2, the first signal TP_SW is at a high level H, and the second signal TP_SWC is at a low level L. In the second stage I2, the coupling circuit P7 adjusts node N1 of the coupling circuit P7 to the first level based on the first signal TP_SW, the second signal TP_SWC, and the low level Com-L of the common electrode signal Vcom_TP, thereby coupling the low level Com-L of the common electrode signal Vcom_TP to the touch electrode line D1.

[0052] 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 node N1 through the first transistor T1. Therefore, the level state of node N1 at this time is the high level H of the first signal TP_SW.

[0053] Furthermore, the high-level H of the second transistor T2 responds to node N1, thereby enabling the low-level Com-L of the common electrode signal Vcom_TP transmitted on the common signal line to be output through the touch electrode line D1. Figure 7 The touch electrode TP1.

[0054] In some embodiments, please refer to Figure 8 and Figure 9 In the third stage I3, the first signal TP_SW is at a high level H, and the second signal TP_SWC is at a low level L. The coupling circuit P7 is further used in the third stage I3 to adjust the first level (high level H) of node N1 to the second level (higher level HH) based on the first signal TP_SW, the second signal TP_SWC, and the high level Com of the common electrode signal Vcom_TP. In response to the second level, the coupling circuit P7 couples the high level Com-H of the common electrode signal Vcom_TP to the touch electrode line D1.

[0055] 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 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 node N1 of the coupling circuit P7 through the parasitic capacitance C2 of the second transistor T2, thereby adjusting the first level (the high level H of the first signal TP_SW) of 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).

[0056] Furthermore, the high-level H of the second transistor T2 responding to node N1 is turned on, thereby enabling the high-level Com-H of the common electrode signal Vcom_TP transmitted on the common signal line to be output through the touch electrode line D1. Figure 7The touch electrode TP1. In some embodiments, the second level is 1.5 times or 1.75 times the original first level, which is close to twice the original first level.

[0057] In some embodiments, please refer to Figure 8 and Figure 9 In stage I4, the first signal TP_SW is at a high level (H), and the second signal TP_SWC is at a low level (L). When the common electrode signal Vcom_TP changes from a high level (Com-H) to a low level (Com-L) in stage I4, the parasitic capacitance C2 of the second transistor T2 in the coupling circuit P7 cannot couple the high level (Com-H) of the common electrode signal Vcom_TP to node N1. At this time, the second level of node N1 returns to the first level (the high level (H) of the first signal TP_SW).

[0058] In some embodiments, please refer to Figure 8 and Figure 9 During the fifth stage I5, the first signal TP_SW and the second signal TP_SWC are at 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. Therefore, the high level H of the first signal TP_SW cannot be transmitted to node N1 through the first transistor T1.

[0059] In some embodiments, please refer to Figure 8 and Figure 9 In stage I6, the first signal TP_SW is at a low level (L), and the second signal TP_SWC is at a high level (H). The coupling circuit P7 cannot transmit the first signal TP_SW to node N1.

[0060] In some embodiments, the third stage I3 is Figure 7 The display stage of the touch display device 300. The sixth stage I6 is... Figure 7 The touch display device 300 has a touch phase. The first phase I1 to the sixth phase I6 constitute one unit cycle. The touch display device 300 will continuously repeat the first phase I1 to the sixth phase I6.

[0061] Figure 10 This is a circuit block diagram illustrating a touch display device 400 according to some embodiments of this invention. In some embodiments, compared to Figure 7 , Figure 10 Implementation examples and Figure 7 The difference lies in Figure 7 The second signal line (used to transmit the second signal TP_SWC) transmits a signal from the shift register SR, Goff. The rest of the structure is similar. Figure 1 The touch display device 300 will not be described in detail here.

[0062] In some embodiments, please refer to Figure 10 The touch display device 400 further includes a shift register SR. The shift register SR is coupled to a second signal line (used to transmit the signal Goff) and an integrated circuit IC / FPC. The shift register SR is used to generate the signal Goff according to the second signal TP_SWC. The signal Goff and the first signal TP_SW are either in the same direction or in opposite directions.

[0063] Figure 11 This is a schematic diagram illustrating the control signal timing of a touch display device according to some embodiments of the present invention. In some embodiments, the signal Goff and the first signal TP_SW are signals in the same direction. Figure 11 The control signal timing diagram of the embodiment and Figure 9 The control signal timing diagrams of the embodiments are similar and will not be described in detail here.

[0064] Figure 12 This is a timing diagram of control signals for a touch display device according to some embodiments of the present invention. In some embodiments, the signal Goff and the first signal TP_SW are inverted signals. In some embodiments, Figure 12 Implementation examples and Figure 9 and Figure 11 The difference in the embodiments is that the common electrode signal Vcom_TP is at a low level Com-L in the first stage I1 and the fifth stage I5, therefore, Figure 8 The node N1 of the coupling circuit P7 is at a 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, causing the node N1 to switch to a high level H.

[0065] It should be noted that, Figure 8 The parasitic circuit C2 of the second transistor T2 has limited coupling effect, thus causing node N1 to be mainly affected by the high-level H change of the first signal TP_SW.

[0066] Based on the foregoing embodiments, this invention provides a touch display device, which increases the recovery capability of the touch electrodes through the coupling circuit of this invention. Specifically, this invention uses the coupling circuit to make the touch electrodes less susceptible to the oscillation of resistors and capacitors in the circuit, thereby enabling the touch electrodes to maintain normal circuit operation.

[0067] Although this case has been disclosed above with detailed embodiments, it does not exclude other possible implementations. Therefore, the scope of protection of this case shall be determined by the appended claims, and not by the foregoing embodiments.

[0068] For those skilled in the art, various modifications and refinements can be made to this case without departing from its spirit and scope. Based on the foregoing embodiments, all modifications and refinements made to this case are also covered within the protection scope of this case.

Claims

1. A touch display device, comprising: A first signal line, used to transmit a first signal; A second signal line for transmitting a second signal, wherein the first signal and the second signal are different; A common signal line is used to transmit a low level and a high level of a common electrode signal; and A coupling circuit is coupled to the first signal line, the second signal line, and the common signal line. In a first stage, the coupling circuit adjusts a node of the coupling circuit to a first level based on a low level of the first signal, the second signal, and the common signal, thereby coupling the low level of the common signal to a touch electrode line. In a second stage, the coupling circuit further adjusts the first level of the node to a second level based on a high level of the first signal, the second signal, and the common signal, and in response to the second level, couples the high level of the common signal to the touch electrode line. In a third stage, the coupling circuit further adjusts the second level of the node to a higher third level based on a high level of the first signal, the second signal, and the common signal, and in response to the third level, couples the high level of the common signal to the touch electrode line. The coupling circuit includes: A first transistor includes 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, thereby transmitting the first signal to the node; and A second transistor includes a first terminal, a second terminal, and a control terminal. 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 via the touch electrode line, and the control terminal of the second transistor is coupled to the node. In a first phase, the second transistor transmits a low level of the common electrode signal to the touch electrode line in response to a first level, and in a second phase, transmits a high level of the common electrode signal to the touch electrode line in response to a second level. The second transistor includes: A parasitic capacitor is coupled to the first terminal of the second transistor and the control terminal of the second transistor. When the common electrode signal is raised from the low level to the high level in the second stage, the parasitic capacitor is used 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. After the node level is raised, the conduction capability of the second transistor is increased, which increases the current flowing from the common signal line to the touch electrode line.

2. The touch display device as claimed in claim 1, further comprising: An integrated circuit is coupled to the first signal line, the second signal line, and the common signal line, wherein the integrated circuit is used to generate the first signal, the second signal, and the common signal.

3. The touch display device as claimed in claim 2, further comprising: A shift register is coupled to the second signal line and the integrated circuit, and is used to generate a third signal based on the second signal, wherein the third signal and the first signal are either co-directional or inverse signals.

Images