CN106775101B

CN106775101B - Touch display panel, driving method thereof and touch display device

Info

Publication number: CN106775101B
Application number: CN201611241722.1A
Authority: CN
Inventors: 詹小静; 苏凌志; 孙莹
Original assignee: Tianma Microelectronics Co Ltd; Xiamen Tianma Microelectronics Co Ltd
Current assignee: Tianma Microelectronics Co Ltd; Xiamen Tianma Microelectronics Co Ltd
Priority date: 2016-12-29
Filing date: 2016-12-29
Publication date: 2019-12-24
Anticipated expiration: 2036-12-29
Also published as: CN106775101A

Abstract

The application discloses a touch display panel, a driving method thereof and a touch display device. The touch display panel comprises a plurality of touch electrodes and a touch driving circuit; the touch control driving circuit comprises a plurality of touch control driving units, the output ends of the touch control driving units are electrically connected with at least one touch control electrode, and the input ends of the touch control driving units are electrically connected with the shifting signal lines in a one-to-one correspondence manner; the touch control driving unit comprises a gating control unit, a common voltage signal output unit and a touch control scanning signal output unit; the input end of the gating control unit is electrically connected with the shift signal line and is used for gating the common voltage signal output unit or gating the touch scanning signal output unit based on the signal input by the shift signal line. According to the scheme of this application, realized the alternative output of touch-control scanning signal and common voltage signal through less electric elements, saved the shared touch-control display panel's of touch-control drive unit territory area, be favorable to the realization of the narrow frame of touch-control display panel.

Description

Touch display panel, driving method thereof and touch display device

Technical Field

The present disclosure generally relates to the field of display technologies, and in particular, to a touch display panel, a driving method thereof, and a touch display device.

Background

The touch display device can detect the coordinate position of a finger in the display screen plane of the touch display device through the touch electrode, and perform corresponding display according to the coordinate position.

In the current touch display device, the touch function is usually implemented by two touch electrode layers, where each touch electrode layer has a plurality of touch electrodes (touch driving electrodes and touch sensing electrodes, respectively) arranged in parallel, and the extending directions of the touch electrodes in the two touch electrode layers intersect. When a finger of a person touches a screen of the touch display device, the finger and some touch electrodes on the screen form a coupling capacitor, and leakage current flows out from the coupling capacitor. The touch detection circuit determines two crossed touch electrodes which form coupling capacitance with fingers on the two layers of touch electrodes by detecting leakage current, so that the touch position is determined.

With the increase of the size of the touch display device, the number of the touch driving electrodes and the touch sensing electrodes is increased to ensure the touch detection accuracy. While on the other hand the output ports of the integrated circuit are limited. Therefore, in the prior art, a touch driving circuit is usually used to provide a corresponding driving signal to each touch driving electrode.

However, the conventional touch driving circuit includes a large number of electrical elements, which is not favorable for realizing a narrow frame of the touch display device.

Disclosure of Invention

In view of the above-mentioned drawbacks and deficiencies in the prior art, it is desirable to provide a touch display panel, a driving method thereof, and a touch display device, so as to solve the technical problems in the prior art.

In a first aspect, an embodiment of the present application provides a touch display panel, including a plurality of touch electrodes and a touch driving circuit; the touch control driving circuit comprises a plurality of touch control driving units, the output ends of the touch control driving units are electrically connected with at least one touch control electrode, and the input ends of the touch control driving units are electrically connected with the shifting signal lines in a one-to-one correspondence manner; the touch control driving unit comprises a gating control unit, a common voltage signal output unit and a touch control scanning signal output unit; the input end of the gating control unit is electrically connected with the shift signal line and is used for gating the common voltage signal output unit or gating the touch scanning signal output unit based on a signal input by the shift signal line; the touch scanning signal output unit comprises a first transmission gate, a second transmission gate, a third transmission gate, a fourth transmission gate, a first reverser and a second reverser; the touch scanning signal is a square wave signal, the square wave signal comprises a first level and a second level, and the touch scanning signal output unit alternately outputs the first level and the second level under the control of the output signal of the gating control unit and the switching signal of the switching control end.

In a second aspect, the present application further provides a driving method of a touch display panel, which is used for driving the touch display panel. The driving method comprises the following steps: in the ith touch control stage of the frame period, providing a first level signal for the ith shift signal line and providing a switching control signal for the switching control end so as to output a touch control scanning signal to the ith touch control electrode, wherein i is an integer and i is greater than 1; and in each display stage of the frame period, providing a second level signal to each shift signal line so as to output the common voltage signal to each touch electrode.

In a third aspect, the present application further provides a touch display device, including the above touch display panel.

According to the scheme of this application, realized the alternative output of touch-control scanning signal and common voltage signal through less electric elements, saved the shared touch-control display panel's of touch-control drive unit territory area, be favorable to the realization of the narrow frame of touch-control display panel. In addition, in the touch driving unit, the transmission gate is used for transmitting signals, so that threshold loss possibly caused when a single transistor is used for transmitting signals with high and low level changes can be avoided, and accurate transmission of the signals is facilitated.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 shows a schematic block diagram of one embodiment of a touch display panel of the present application;

FIG. 2 shows a schematic block diagram of an alternative implementation of the touch display panel of FIG. 1;

fig. 3 shows a schematic structural diagram of a touch driving unit in the touch display panel of the present application;

FIG. 4 shows a schematic circuit diagram of one embodiment of the touch driver unit of FIG. 3;

FIG. 5 is a schematic timing diagram of driving signals of the touch driving unit shown in FIG. 4;

FIG. 6 shows a schematic circuit diagram of another embodiment of the touch driver unit of FIG. 3;

FIG. 7 is a schematic block diagram illustrating another embodiment of a touch display panel of the present application;

FIG. 8 shows a schematic timing sequence of control signals for driving the touch display panel shown in FIG. 7;

FIG. 9 shows a schematic block diagram of yet another embodiment of a touch display panel of the present application;

fig. 10 shows a schematic flow chart of the driving method of the present application;

fig. 11 shows a schematic structural diagram of an embodiment of a touch display device of the present application.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Fig. 1 is a schematic structural diagram of an embodiment of a touch display panel according to the present application.

The touch display panel of the present embodiment includes a plurality of touch electrodes 110 and a touch driving circuit 120.

The touch driving circuit 120 includes a plurality of touch driving units 121, and an output end of the touch driving unit 121 is electrically connected to the at least one touch electrode 110. The input end of each touch driving unit 121 is electrically connected to each shift signal line 130 in a one-to-one correspondence. The touch electrode 110 may be, for example, a strip electrode extending along the first direction D1 shown in fig. 1.

In some optional implementations of the touch display panel of the present embodiment, as shown in fig. 1, each touch driving unit 121 may be electrically connected to each touch electrode 110 in a one-to-one correspondence. Thus, when one of the shift signal lines 130 outputs a gate signal to the touch driving unit 121, the touch driving unit 121 can output a touch scan signal to the touch electrode 110 electrically connected thereto.

Alternatively, in other optional implementations of the touch display panel of the embodiment, as shown in fig. 2, each touch driving unit 221 may be electrically connected to a plurality of touch electrodes 210, a plurality of touch electrodes 210 electrically connected to the same touch driving unit 221 may form a touch electrode group, and for example, two adjacent touch electrode groups may have at least one common touch electrode 210. In this way, each touch electrode can be scroll-scanned, thereby improving the accuracy of touch detection and reducing the number of shift signal lines 130.

Next, the structure of the touch driving unit will be further described.

First, please refer to fig. 3, which shows a schematic structural diagram of a touch driving unit in the touch display panel of the present application.

The touch driving unit includes a gate control unit 310, a common voltage signal output unit 320, and a touch scan signal output unit 330.

The input end of the gate control unit 310 is electrically connected to the shift signal line SR, and is configured to gate the common voltage signal output unit 320 or gate the touch scan signal output unit 330 based on a signal input by the shift signal line SR.

In this way, when the common voltage signal output unit 320 is gated, the touch driving unit outputs the common voltage signal to the touch electrode electrically connected thereto, and when the touch scan signal output unit 330 is gated, the touch driving unit outputs the touch scan signal to the touch electrode electrically connected thereto.

In some optional implementations, the touch scan signal may be a square wave signal. The square wave signal includes a first level and a second level. In these alternative implementations, as shown in fig. 3, the touch scan signal output unit 330 may alternately output the first level and the second level under the control of the output signal of the gate control unit 310 and the switching signal of the switching control terminal SEL, so as to implement the output of the touch scan signal.

Fig. 4 is a schematic circuit diagram of an embodiment of a touch driving unit according to the present application.

In fig. 4, the touch driving unit also includes a gate control unit 410, a common voltage signal output unit 420, and a touch scan signal output unit 430.

The touch scan signal output unit 430 includes a first transmission gate, a second transmission gate, a third transmission gate, a fourth transmission gate, a first inverter IV1, and a second inverter IV 2.

Wherein the first transmission gate includes a first PMOS transistor TP1 and a first NMOS transistor TN 1. The gate of the first NMOS transistor TN1 is electrically connected to the switching control terminal SEL and the input terminal of the first inverter IV1, the gate of the first PMOS transistor is electrically connected to the output terminal of the first inverter IV1, and the first pole of the first NMOS transistor TN1 and the first pole of the first PMOS transistor TP1 are electrically connected to the output terminal OUT of the touch driving unit.

The second transmission gate includes a second PMOS transistor TP2 and a second NMOS transistor TN 2. The gate of the second PMOS transistor TP2 is electrically connected to the switching control terminal SEL and the input terminal of the first inverter IV1, the gate of the second NMOS transistor TN2 is electrically connected to the output terminal of the first inverter IV1, and the first electrode of the second NMOS transistor TN2 and the first electrode of the second PMOS transistor TP2 are electrically connected to the output terminal OUT of the touch driving unit.

The third transmission gate includes a third PMOS transistor TP3 and a third NMOS transistor TN 3. A gate of the third PMOS transistor TP3 is electrically connected to the output terminal of the gate control unit 410 and the input terminal of the second inverter IV2, a gate of the third NMOS transistor TN3 is electrically connected to the output terminal of the second inverter IV2, a first pole of the third PMOS transistor TP3 and a first pole of the third NMOS transistor TN3 are electrically connected to a second pole of the first PMOS transistor TP1 and a second pole of the first NMOS transistor TN1, and a second pole of the third PMOS transistor TP3 and a second pole of the third NMOS transistor TN3 are electrically connected to the first level signal terminal TPH.

The fourth transmission gate includes a fourth PMOS transistor TP4 and a fourth NMOS transistor TN 4. A gate of the fourth PMOS transistor TP4 is electrically connected to the output terminal of the gate control unit 410 and the input terminal of the second inverter IV2, a gate of the fourth NMOS transistor TN4 is electrically connected to the output terminal of the second inverter IV2, a first pole of the fourth PMOS transistor TP4 and a first pole of the fourth NMOS transistor TN4 are electrically connected to the second level signal terminal COMDC1, and a second pole of the fourth PMOS transistor TP4 and a second pole of the fourth NMOS transistor TN4 are electrically connected to a second pole of the second PMOS transistor TP2 and a second pole of the second NMOS transistor TN 2.

In addition, in the present embodiment, the gate control unit 410 may include a ninth PMOS transistor TP9 and a ninth NMOS transistor TN 9.

The gates of the ninth PMOS transistor TP9 and the ninth NMOS transistor TN9 are electrically connected to the shift signal line SR, the first pole of the ninth PMOS transistor TP9 is electrically connected to the third level signal terminal VGH, the first pole of the ninth NMOS transistor TN9 is electrically connected to the fourth level signal terminal VGL, and the second poles of the ninth PMOS transistor TP9 and the ninth NMOS transistor TN9 are electrically connected to the output terminal of the gate control unit 410.

In addition, in the present embodiment, the common voltage signal output unit 420 includes a fifth transmission gate.

The fifth transmission gate includes a tenth PMOS transistor TP10 and a tenth NMOS transistor TN 10. A gate of the tenth NMOS transistor TN10 is electrically connected to the output terminal of the gate control unit 410 and the input terminal of the second inverter IV2, a gate of the tenth PMOS transistor TP10 is electrically connected to the output terminal of the second inverter IV2, a first pole of the tenth PMOS transistor TP10 and a first pole of the tenth NMOS transistor TN10 are electrically connected to the fifth level signal terminal COMDC2, and a second pole of the tenth PMOS transistor TP10 and a second pole of the tenth NMOS transistor TN10 are electrically connected to the output terminal OUT of the touch driving unit.

Next, the operation principle of the touch driving unit of the present embodiment will be further described with reference to the timing sequence shown in fig. 5. In the following description, the following description will be schematically described with VGH being a high level signal, VGL being a low level signal, and the first level signal terminal TPH providing a high level signal.

When the shift signal line SR electrically connected to the input terminal of the gate control unit 410 outputs a high level, the ninth NMOS transistor TN9 of the gate control unit 410 is turned on and the ninth PMOS transistor TP9 is turned off. The gate control unit 410 outputs a low level signal (VGL) and turns on the third NMOS transistor TN3 and the third PMOS transistor TP3 in the third transmission gate. Thus, when the switching control terminal SEL inputs a high level, the first NMOS transistor TN1 and the first PMOS transistor TP1 of the first transfer gate are turned on, thereby supplying a high level signal supplied from the first level signal terminal TPH to the output terminal OUT. When the switching control terminal SEL inputs a low level, the second NMOS transistor TN2 and the second PMOS transistor TP2 of the second transmission gate are turned on, and the fourth NMOS transistor TN4 and the fourth PMOS transistor TP4 of the fourth transmission gate are turned on, so that the low level signal provided by the second level signal terminal COMDC1 is provided to the output terminal OUT. That is, when the shift signal line SR outputs a high level, the output terminal OUT also outputs a high level and a low level along with the high and low switching of the level of the input signal of the switching control terminal SEL, thereby forming a touch scan signal.

And when the shift signal line SR electrically connected to the input terminal of the gate control unit 410 outputs a low level, the ninth NMOS transistor TN9 of the gate control unit 410 is turned off and the ninth PMOS transistor TP9 is turned on. The gate control unit 410 outputs a high level signal (VGH). At this time, the tenth PMOS transistor and the tenth NMOS transistor in the common voltage signal output unit 420 are turned on, thereby supplying the common voltage signal supplied from the fifth level signal terminal COMDC2 to the output terminal OUT.

As can be seen from the above description, when the shift signal line SR outputs a high level, the touch scan signal output unit of the present embodiment is gated, so that the touch driving unit outputs the touch scan signal, and when the shift signal line SR outputs a low level, the common voltage signal output unit of the present embodiment is gated, so that the touch scan signal and the common voltage signal are alternately output under the control of the output signal of the shift signal line SR.

The touch driving unit of the embodiment adopts fewer electric elements to realize the alternate output of the touch scanning signal and the common voltage signal, saves the layout area of the touch display panel occupied by the touch driving unit, and is favorable for realizing the narrow frame of the touch display panel.

In addition, the touch driving unit of the embodiment adopts the transmission gate to transmit the signal, so that threshold loss possibly caused when a single transistor is adopted to transmit the signal with high and low level changes can be avoided, and accurate transmission of the signal is facilitated.

Fig. 6 is a schematic circuit diagram of another embodiment of a touch driving unit according to the present application.

In fig. 6, the touch driving unit also includes a gate control unit 610, a common voltage signal output unit 620, and a touch scan signal output unit 630.

The touch scan signal output unit 630 includes a first transmission gate, a second transmission gate, a third transmission gate, a fourth transmission gate, a first inverter IV1, and a second inverter IV 2.

The first transmission gate includes a fifth PMOS transistor TP5 and a fifth NMOS transistor TN 5. A gate of the fifth NMOS transistor TN5 is electrically connected to the switching control terminal SEL and the input terminal of the first inverter IV1, a gate of the fifth PMOS transistor TP5 is electrically connected to the output terminal of the first inverter IV1, and a first electrode of the fifth NMOS transistor TN5 and a first electrode of the fifth PMOS transistor TP5 are electrically connected to the first level signal terminal TPH.

The second transmission gate includes a sixth PMOS transistor TP6 and a sixth NMOS transistor TN 6. The gate of the sixth PMOS transistor TP6 is electrically connected to the switching control terminal SEL and the input terminal of the first inverter IV1, the gate of the sixth NMOS transistor TN6 is electrically connected to the output terminal of the first inverter IV1, and the first electrode of the sixth NMOS transistor TN6 and the first electrode of the sixth PMOS transistor TP6 are electrically connected to the second level signal terminal COMDC 1.

The third transmission gate includes a seventh PMOS transistor TP7 and a seventh NMOS transistor TN 7. A gate of the seventh PMOS transistor TP7 is electrically connected to the output terminal of the gate control unit 610 and the input terminal of the second inverter IV2, a gate of the seventh NMOS transistor TN7 is electrically connected to the output terminal of the second inverter IV2, a first pole of the seventh PMOS transistor TP7 and a first pole of the seventh NMOS transistor TN7 are electrically connected to a second pole of the fifth NMOS transistor TN5 and a second pole of the fifth PMOS transistor TP5, and a second pole of the seventh PMOS transistor TP7 and a second pole of the seventh NMOS transistor TN7 are electrically connected to the output terminal OUT of the touch driving unit.

The fourth transmission gate includes an eighth PMOS transistor TP8 and an eighth NMOS transistor TN 8. A gate of the eighth PMOS transistor TP8 is electrically connected to the output terminal of the gate control unit 610 and the input terminal of the second inverter IV2, a gate of the eighth NMOS transistor TN8 is electrically connected to the output terminal of the second inverter IV2, a first pole of the eighth PMOS transistor TP8 and a first pole of the eighth NMOS transistor TN8 are electrically connected to a second pole of the sixth PMOS transistor TP6 and a second pole of the sixth NMOS transistor TN6, and a second pole of the eighth PMOS transistor TP8 and a second pole of the eighth NMOS transistor TN8 are electrically connected to the output terminal OUT of the touch driving unit.

In addition, in the present embodiment, the gate control unit 610 and the common voltage signal output unit 620 have a similar structure to the embodiment shown in fig. 4.

Specifically, the gate control unit 610 may include a ninth PMOS transistor TP9 and a ninth NMOS transistor TN 9. The gates of the ninth PMOS transistor TP9 and the ninth NMOS transistor TN9 are electrically connected to the shift signal line SR, the first pole of the ninth PMOS transistor TP9 is electrically connected to the third level signal terminal VGH, the first pole of the ninth NMOS transistor TP9 is electrically connected to the fourth level signal terminal VGL, and the second poles of the ninth PMOS transistor TP9 and the ninth NMOS transistor TN9 are electrically connected to the output terminal of the gate control unit 410.

The common voltage signal output unit 420 includes a fifth transmission gate. The fifth transmission gate includes a tenth PMOS transistor TP10 and a tenth NMOS transistor TN 10. A gate of the tenth NMOS transistor TN10 is electrically connected to the output terminal of the gate control unit 410 and the input terminal of the second inverter IV2, a gate of the tenth PMOS transistor TP10 is electrically connected to the output terminal of the second inverter IV2, a first pole of the tenth PMOS transistor TP10 and a first pole of the tenth NMOS transistor TN10 are electrically connected to the fifth level signal terminal COMDC2, and a second pole of the tenth PMOS transistor TP10 and a second pole of the tenth NMOS transistor TN10 are electrically connected to the output terminal OUT of the touch driving unit.

The touch driving unit of the present embodiment can also be applied to the timing sequence shown in fig. 5, and the working principle of the touch driving unit of the present embodiment will be further described with reference to the timing sequence shown in fig. 5. In the following description, the following description will be schematically described with VGH being a high level signal, VGL being a low level signal, and the first level signal terminal TPH providing a high level signal.

When the shift signal line SR electrically connected to the input terminal of the gate control unit 610 outputs a high level, the ninth NMOS transistor TN9 of the gate control unit 610 is turned on and the ninth PMOS transistor TP9 is turned off. The gate control unit 610 outputs a low level signal (VGL). The seventh PMOS transistor TP7 and the seventh NMOS transistor in the third transmission gate are turned on, and the eighth PMOS transistor TP8 and the eighth NMOS transistor TN8 in the fourth transmission gate are turned on. Thus, when the switching control terminal SEL inputs a high level, the fifth PMOS transistor and the fifth NMOS transistor in the first transmission gate are turned on, thereby supplying the high level signal supplied from the first level signal terminal TPH to the output terminal OUT. And when the switching control terminal SEL inputs a low level, the sixth PMOS transistor TP6 and the sixth NMOS transistor TN6 in the second transmission gate are turned on, thereby providing the low level signal provided by the second level signal terminal COMDC1 to the output terminal OUT. That is, when the shift signal line SR outputs a high level, the output terminal OUT also outputs a high level and a low level along with the switching of the high level and the low level of the input signal of the switching control terminal SEL, thereby forming a touch scan signal.

And when the shift signal line SR electrically connected to the input terminal of the gate control unit 610 outputs a low level, the ninth NMOS transistor TN9 of the gate control unit 610 is turned off and the ninth PMOS transistor TP9 is turned on. The gate control unit 610 outputs a high level signal (VGH). At this time, the tenth PMOS transistor and the tenth NMOS transistor in the common voltage signal output unit 620 are turned on, thereby supplying the common voltage signal supplied from the fifth level signal terminal COMDC2 to the output terminal OUT.

Fig. 7 is a schematic structural diagram of another embodiment of a touch display panel according to the present application.

Compared with the embodiment shown in fig. 1, the touch display panel of the present embodiment further includes a touch shift circuit 740, and the touch shift circuit 740 is electrically connected to the shift signal lines 730 in a one-to-one correspondence.

The touch shift circuit 740 can be used to provide a single pulse signal to each shift signal line 730 in a time division manner.

In some optional implementations, the touch shift circuit 740 of the embodiment may include a plurality of cascaded touch shift units 741, and an output end of each touch shift unit 741 is electrically connected to each shift signal line in a one-to-one correspondence manner. In these alternative implementations, the output signal of the previous touch shifting unit 741 serves as the input signal of the next touch shifting unit, so that the phases of the output signals of the adjacent touch shifting units 741(VSR 1-VSRn) are different by a fixed value.

Specifically, referring to fig. 8, a schematic timing sequence of each control signal for driving the touch display panel shown in fig. 7 is shown.

The SR1, SR2, and SRn are the shift signals output by the first-stage touch shift unit VSR1, the second-stage touch shift unit VSR2, and the nth-stage touch shift unit VSRn, respectively.

During T1, SR1 outputs a high level signal, and accordingly, the touch driving unit electrically connected thereto gates the touch scan signal output unit, thereby outputting a touch scan signal to the touch electrode TX1 connected thereto. Meanwhile, the SR2 to SRn output low level signals, and the touch driving unit electrically connected thereto gates the common voltage signal output unit, thereby outputting common voltage signals to the touch electrodes TX2 to TXn connected thereto.

Similarly, during T2, SR2 outputs a high level signal, and accordingly, the touch driving unit electrically connected thereto gates the touch scan signal output unit, thereby outputting a touch scan signal to the touch electrode TX2 connected thereto. Meanwhile, the SR1 and SR 3-SRn output low level signals, and the touch driving unit electrically connected thereto gates the common voltage signal output unit, thereby outputting common voltage signals to the touch electrodes TX1 and TX 3-TXn connected thereto.

Similarly, during Tn, SRn outputs a high level signal, and accordingly, the touch driving unit electrically connected thereto gates the touch scan signal output unit, thereby outputting a touch scan signal to the touch electrode TXn connected thereto. Meanwhile, the SR 1-SRn-1 outputs low level signals, and the touch driving unit electrically connected thereto gates the common voltage signal output unit, thereby outputting common voltage signals to the touch electrodes TX 1-TXn-1 connected thereto.

In this way, high-level signals are output step by step through the VSRs 1 to VSRn, and step by step scanning of the touch electrode is realized.

It should be noted that, when the touch electrodes and the touch driving unit are connected in a one-to-one connection manner as shown in fig. 1 or fig. 7, TX1 to TXn may respectively represent the first touch electrode to the nth touch electrode. When the touch electrodes are connected to the touch driving unit in a "group scrolling" connection manner as shown in fig. 2, TX1 to TXn may represent the first group of touch electrodes to the nth group of touch electrodes, respectively. The number of touch electrodes included in each group of touch electrodes and the number of touch electrodes shared by adjacent groups of touch electrodes are not limited.

Fig. 9 is a schematic structural diagram of another embodiment of a touch display panel according to the present application.

Unlike the embodiment shown in fig. 1 and fig. 7, the touch display panel of the present embodiment includes an array substrate 910 and a color filter substrate 920 disposed opposite to the array substrate 910.

The touch electrode can be used as the touch driving electrode 911, and the touch driving electrode 911, the touch driving circuit 912 and the touch shifting circuit (not shown) can be disposed on the array substrate 910. In addition, a touch sensing electrode 921 intersecting the touch driving electrode 911 may be disposed on the color film substrate 920. For example, the touch driving electrodes may extend in a first direction D1, and the touch sensing electrodes 921 may extend in a second direction D2 intersecting the first direction.

Those skilled in the art will appreciate that the touch display panel of the embodiments of the present application may include other components besides the components described above, for example, an integrated circuit for providing signals (e.g., data signals, control signals of the touch shift unit, etc.) to the touch display panel, and the like. These components will not be described in detail so as not to obscure the focus of the present application.

Fig. 10 is a schematic flowchart of an embodiment of a driving method of a touch display panel according to the present application. The driving method of the present embodiment may be applied to the touch display panel described in any of the above embodiments.

The driving method of the present embodiment includes:

step 1010, in the ith touch stage of the frame period, providing a first level signal to the ith shift signal line, and providing a switching control signal to the switching control terminal, so as to output a touch scanning signal to the ith touch electrode. Wherein i is an integer and i > 1.

In some optional implementations, when the driving method of this embodiment is applied to the touch display panel in the connection manner in which the touch electrodes and the touch driving units are in one-to-one correspondence as shown in fig. 1 or fig. 7, the number of touch stages in one frame period may be greater than or equal to the number of touch electrodes, so that each touch electrode completes at least one touch scan in one frame period.

In other alternative implementations, when the driving method of this embodiment is applied to the touch display panel in the connection manner of "group scrolling" between the touch electrodes and the touch driving unit shown in fig. 2, the number of touch phases in one frame period may be greater than or equal to the number of touch electrode groups, for example, so that each touch electrode completes at least one touch scan in one frame period.

In step 1020, in each display stage of the frame period, a second level signal is provided to each shift signal line to output the common voltage signal to each touch electrode. In this way, the touch electrode can be reused as a common electrode, so that the touch display panel can display a predetermined picture.

In some optional implementations, the driving method of this embodiment may further include:

and in the ith touch stage, providing a second level signal to other shift signal lines except the ith shift signal line so as to output the common voltage signal to other touch electrodes except the ith touch electrode. In this way, in any ith touch stage, except that the touch electrode electrically connected to the ith shift signal line receives the touch scan signal, the other touch electrodes all receive the common voltage signal, so that the other touch electrodes can be reused as the common electrode in the touch stage, thereby ensuring that the area corresponding to the touch electrode on the touch display panel is normally displayed.

The application also discloses a touch display device, as shown in fig. 11. The touch display device 1100 may include the touch display panel as described above. It will be appreciated by those skilled in the art that the touch display device may comprise some other known structure in addition to the touch display panel as described above. Such well-known structures will not be further described in order not to obscure the focus of the present application.

The touch display device of the present application may be any device including the touch display panel as described above, including but not limited to a display of a cellular phone, a tablet computer, a display applied to a smart wearable device, a display applied to a vehicle such as an automobile, and the like as shown in fig. 11. As long as the touch display device includes the structure of the touch display panel disclosed in the present application, it is considered to fall within the scope of the present application.

It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. A touch display panel is characterized by comprising a plurality of touch electrodes and a touch driving circuit;

the touch control driving circuit comprises a plurality of touch control driving units, the output ends of the touch control driving units are electrically connected with at least one touch control electrode, and the input ends of the touch control driving units are electrically connected with the shifting signal lines in a one-to-one correspondence manner;

the touch control driving unit comprises a gating control unit, a common voltage signal output unit and a touch control scanning signal output unit;

the input end of the gating control unit is electrically connected with a shift signal line and is used for gating the common voltage signal output unit or gating the touch scanning signal output unit based on a signal input by the shift signal line;

the touch scanning signal output unit comprises a first transmission gate, a second transmission gate, a third transmission gate, a fourth transmission gate, a first reverser and a second reverser;

the touch scanning signal is a square wave signal, the square wave signal comprises a first level and a second level, and the touch scanning signal output unit alternately outputs the first level and the second level under the control of an output signal of the gating control unit and a switching signal of the switching control end;

the first transmission gate comprises a first PMOS transistor and a first NMOS transistor, the grid electrode of the first NMOS transistor is electrically connected with the switching control end and the input end of the first reverser, the grid electrode of the first PMOS transistor is electrically connected with the output end of the first reverser, and the first pole of the first NMOS transistor and the first pole of the first PMOS transistor are electrically connected with the output end of the touch control driving unit; the second transmission gate comprises a second PMOS transistor and a second NMOS transistor, the grid electrode of the second PMOS transistor is electrically connected with the switching control end and the input end of the first reverser, the grid electrode of the second NMOS transistor is electrically connected with the output end of the first reverser, and the first pole of the second NMOS transistor and the first pole of the second PMOS transistor are electrically connected with the output end of the touch control driving unit; the third transmission gate comprises a third PMOS transistor and a third NMOS transistor, a gate of the third PMOS transistor is electrically connected with the output end of the gating control unit and the input end of the second inverter, a gate of the third NMOS transistor is electrically connected with the output end of the second inverter, a first electrode of the third PMOS transistor and a first electrode of the third NMOS transistor are electrically connected with a second electrode of the first PMOS transistor and a second electrode of the first NMOS transistor, and a second electrode of the third PMOS transistor and a second electrode of the third NMOS transistor are electrically connected with the first level signal end; the fourth transmission gate comprises a fourth PMOS transistor and a fourth NMOS transistor, a gate of the fourth PMOS transistor is electrically connected with the output end of the gating control unit and the input end of the second inverter, a gate of the fourth NMOS transistor is electrically connected with the output end of the second inverter, a first electrode of the fourth PMOS transistor and a first electrode of the fourth NMOS transistor are electrically connected with the second level signal end, and a second electrode of the fourth PMOS transistor and a second electrode of the fourth NMOS transistor are electrically connected with a second electrode of the second PMOS transistor and a second electrode of the second NMOS transistor;

alternatively, the first and second electrodes may be,

the first transmission gate comprises a fifth PMOS transistor and a fifth NMOS transistor, the grid electrode of the fifth NMOS transistor is electrically connected with the switching control end and the input end of the first reverser, the grid electrode of the fifth PMOS transistor is electrically connected with the output end of the first reverser, and the first electrode of the fifth NMOS transistor and the first electrode of the fifth PMOS transistor are electrically connected with the first level signal end; the second transmission gate comprises a sixth PMOS transistor and a sixth NMOS transistor, the grid electrode of the sixth PMOS transistor is electrically connected with the switching control end and the input end of the first reverser, the grid electrode of the sixth NMOS transistor is electrically connected with the output end of the first reverser, and the first electrode of the sixth NMOS transistor and the first electrode of the sixth PMOS transistor are electrically connected with the second level signal end; the third transmission gate comprises a seventh PMOS transistor and a seventh NMOS transistor, a gate of the seventh PMOS transistor is electrically connected with the output end of the gating control unit and the input end of the second inverter, a gate of the seventh NMOS transistor is electrically connected with the output end of the second inverter, a first pole of the seventh PMOS transistor and a first pole of the seventh NMOS transistor are electrically connected with a second pole of the fifth NMOS transistor and a second pole of the fifth PMOS transistor, and the second pole of the seventh PMOS transistor and the second pole of the seventh NMOS transistor are electrically connected with the output end of the touch driving unit; the fourth transmission gate comprises an eighth PMOS transistor and an eighth NMOS transistor, the grid electrode of the eighth PMOS transistor is electrically connected with the output end of the gating control unit and the input end of the second reverser, the grid electrode of the eighth NMOS transistor is electrically connected with the output end of the second reverser, the first pole of the eighth PMOS transistor and the first pole of the eighth NMOS transistor are electrically connected with the second pole of the sixth PMOS transistor and the second pole of the sixth NMOS transistor, and the second pole of the eighth PMOS transistor and the second pole of the eighth NMOS transistor are electrically connected with the output end of the touch control driving unit.

2. The touch display panel of claim 1, wherein the gate control unit comprises a ninth PMOS transistor and a ninth NMOS transistor;

the gates of the ninth PMOS transistor and the ninth NMOS transistor are electrically connected to the shift signal line, the first electrode of the ninth PMOS transistor is electrically connected to the third level signal terminal, the first electrode of the ninth NMOS transistor is electrically connected to the fourth level signal terminal, and the second electrodes of the ninth PMOS transistor and the ninth NMOS transistor are electrically connected to the output terminal of the gating control unit.

3. The touch display panel according to claim 1, wherein the common voltage signal output unit includes a fifth transmission gate;

the fifth transmission gate comprises a tenth PMOS transistor and a tenth NMOS transistor, the grid electrode of the tenth NMOS transistor is electrically connected with the output end of the gating control unit and the input end of the second reverser, the grid electrode of the tenth PMOS transistor is electrically connected with the output end of the second reverser, the first electrode of the tenth PMOS transistor and the first electrode of the tenth NMOS transistor are electrically connected with the fifth level signal end, and the second electrode of the tenth PMOS transistor and the second electrode of the tenth NMOS transistor are electrically connected with the output end of the touch control driving unit.

4. The touch display panel according to claim 1, further comprising a touch shift circuit electrically connected to each of the shift signal lines;

the touch shift circuit is used for providing a single pulse signal to each shift signal line in a time-sharing manner.

5. The touch display panel according to claim 4, wherein the touch shift circuit comprises a plurality of cascaded touch shift units, and an output terminal of each touch shift unit is electrically connected to each shift signal line in a one-to-one correspondence.

6. The touch display panel according to claim 4, wherein the touch display panel comprises an array substrate and a color film substrate arranged opposite to the array substrate;

the touch control electrode is a touch control driving electrode, and the touch control driving electrode, the touch control driving circuit and the touch control shifting circuit are arranged on the array substrate;

and a touch sensing electrode crossed with the touch driving electrode is arranged on the color film substrate.

7. A driving method of a touch display panel for driving the touch display panel according to any one of claims 1 to 6, comprising:

in the ith touch control stage of the frame period, providing a first level signal for the ith shift signal line and providing a switching control signal for the switching control end so as to output a touch control scanning signal to the ith touch control electrode, wherein i is an integer and i is greater than 1;

and in each display stage of the frame period, providing a second level signal to each shift signal line so as to output the common voltage signal to each touch electrode.

8. The driving method according to claim 7, further comprising:

and in the ith touch stage, providing a second level signal to other shift signal lines except the ith shift signal line so as to output the common voltage signal to other touch electrodes except the ith touch electrode.

9. A touch display device comprising the touch display panel according to claim 1.