CN114816138A

CN114816138A - Touch panel, driving method thereof and display device

Info

Publication number: CN114816138A
Application number: CN202210346153.6A
Authority: CN
Inventors: 卢峰
Original assignee: Shanghai Tianma Microelectronics Co Ltd
Current assignee: Shanghai Tianma Microelectronics Co Ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-07-29
Anticipated expiration: 2042-03-31
Also published as: CN114816138B

Abstract

The invention discloses a touch panel, a driving method thereof and a display device, wherein the touch panel comprises: touch electrodes arranged in an array along the row direction and the column direction respectively; the multiplexing circuit is electrically connected with the control end and the touch electrode respectively; the touch control multiplexing circuit comprises a row detection circuit and a column detection circuit; the row detection circuit and the column detection circuit can be switched to detect. According to the technical scheme provided by the invention, different touch detection modes can be switched through the row detection circuit and the column monitoring circuit, so that the self-capacitance touch detection and the active pen touch detection are compatible at the same time.

Description

Touch panel, driving method thereof and display device

Technical Field

The invention relates to the technical field of display, in particular to a touch panel, a driving method thereof and a display device.

Background

An on-cell (Y-OCTA or TPOT) touch screen of an Active-matrix organic light-emitting diode (AMOLED) adopts an integrated touch screen structure, and a touch screen electrode formed by a metal grid is formed above an AMOLED packaging layer.

In the prior art, TPOT products are generally either mutual capacitance or self-capacitance. Specifically, for the self-capacitance scheme, due to independent addressing, each node electrode has an independent lead, so the number of leads is increased to X2 × Y2, where X2 is the number of rows of electrodes in the X direction, and Y2 is the number of columns of electrodes in the Y direction, and therefore, each node electrode cannot be connected to an independent touch IC pin, and generally, a multiplexing circuit in a panel is needed to detect the node electrodes in different areas in a time-sharing manner, so that the number of output leads is reduced.

However, the multiplexing circuit determines the scanning sequence when the self-capacitance electrode is partitioned, and the multiplexing circuit cannot be flexibly adjusted and cannot be applied to the application of the active capacitance pen.

Disclosure of Invention

The embodiment of the invention provides a touch panel, a driving method thereof and a display device, which are used for realizing the support of a self-contained OLED touch panel on an active pen.

In a first aspect, an embodiment of the present invention provides a touch panel, including: touch electrodes arranged in an array along the row direction and the column direction respectively;

the multiplexing circuit is electrically connected with the control end and the touch electrode respectively;

the touch control multiplexing circuit comprises a row detection circuit and a column detection circuit; the row detection circuit and the column detection circuit can be switched to detect.

In a second aspect, an embodiment of the present invention further provides a driving method for a touch panel, which is applicable to the touch panel provided in any embodiment of the present invention, where the driving method includes:

in a first mode, each frame of image is subjected to self-capacitance detection of touch control through one of a row detection circuit or a column detection circuit;

in the second mode, each frame of image is detected by the column detection circuit and the row detection circuit to obtain the coordinates of the touch point along the row direction and the coordinates along the column direction.

In a third aspect, an embodiment of the present invention provides a display device, where the display device includes the touch panel provided in any embodiment of the present invention.

In the invention, the touch panel comprises touch electrodes arranged in an array, and a control end capable of outputting a control signal is connected with the corresponding touch electrode through a multiplexer so as to drive the touch electrode. The multiplexing circuit comprises a row detection circuit and a column detection circuit, and the row detection circuit and the column detection circuit can be switched to perform detection, so that switching of different touch detection modes is realized, compatibility of self-capacitance touch detection and active pen touch detection is realized through the same multiplexer, the problems that the scanning time sequence of the conventional multiplexer is fixed and only the self-capacitance detection can be realized are effectively solved, two multiplexers are not needed, the structure is simple, the non-display area space occupied by the multiplexers is saved, and further the narrow-frame design of the touch panel is realized.

Drawings

FIG. 1 is a schematic diagram of a prior art multiplexing circuit;

fig. 2 is a schematic structural diagram of a touch panel according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic diagram of the multiplexer of FIG. 2;

FIG. 4 is a schematic diagram of an alternative enlarged configuration of the multiplexer of FIG. 2;

FIG. 5 is a schematic diagram of an alternative enlarged configuration of the multiplexer of FIG. 2;

FIG. 6 is a schematic cross-sectional view of the touch panel of FIG. 2 along a row direction Y;

fig. 7 is a schematic structural diagram of another touch panel according to an embodiment of the invention;

fig. 8 is a schematic structural diagram of another touch panel according to an embodiment of the present invention;

fig. 9 is a flowchart illustrating a driving method of a touch panel according to an embodiment of the invention;

FIG. 10 is a timing diagram illustrating a first mode of driving according to an embodiment of the present invention;

FIG. 11 is a timing diagram illustrating a first driving mode according to an embodiment of the present invention;

FIG. 12 is a timing diagram illustrating a second mode of driving according to the present invention;

FIG. 13 is a timing diagram illustrating a second driving mode according to an embodiment of the present invention;

FIG. 14 is a timing diagram illustrating a first driving mode according to an embodiment of the present invention;

FIG. 15 is a timing diagram illustrating a second driving mode according to an embodiment of the present invention;

fig. 16 is a schematic structural diagram of a display device according to an embodiment of the present invention.

Detailed Description

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

For the self-capacitance scheme, due to independent addressing, each node electrode has an independent lead, and in order to avoid the number of leads from increasing to X2 × Y2, where X2 is the number of rows of electrodes in the X direction and Y2 is the number of columns of electrodes in the Y direction, it is necessary to shorten the number of output leads by multiplexing circuits in the panel, so that the node electrodes in different areas can be detected in a time-sharing manner. However, the multiplexing circuit determines the sequence of the self-capacitance electrode partition time-sharing scanning, and cannot be flexibly adjusted. As shown in fig. 1, fig. 1 is a schematic structural diagram of a multiplexer circuit in the prior art, in which the multiplexer in the prior art includes a common driving transistor T1 ' corresponding to a touch electrode P1 ' and a column switching transistor T2 ' corresponding to a touch electrode P1 ', the column switching transistor T2 ' corresponding to the touch electrode P1 ' can be driven column by column through a column switch control line, e.g., SW4 ' to SW6 ', and driving signals can be input row by row through an input output line, e.g., SX1 ' to SX3 ', so that the driving signals can be transmitted to the corresponding touch electrode P1 ' through the column switching transistor T2 ', and can be specifically positioned to a certain touch electrode P1 ' through the column switch control line and the input output line. When the current touch electrode P1 'is driven and detected, the remaining touch electrodes P1' are connected to the common driving line COM 'through the common driving tube T1', and the common driving tube T1 'is controlled through common driving switch lines, for example, SW 1' to SW3 ', the multiplexer only realizes the self-capacitance detection of the touch electrode P1', the scanning sequence is relatively fixed and cannot be flexibly adjusted, the touch detection of the active pen needs to respectively detect the row coordinate and the column coordinate of the touch point, and the multiplexer in the prior art cannot respectively detect the row coordinate and the column coordinate.

To solve the problem that the multiplexer cannot be compatible with the touch detection of the active pen, an embodiment of the present invention provides a touch panel, including:

touch electrodes arranged in an array along the row direction and the column direction respectively;

the multiplexing circuit comprises a row detection circuit and a column detection circuit; the row detection circuit and the column detection circuit can switch to detect.

In the embodiment of the invention, the touch panel comprises touch electrodes arranged in an array, and the control end capable of outputting the control signal is connected with the corresponding touch electrode through the multiplexer so as to drive the touch electrode. The multiplexing circuit comprises a row detection circuit and a column detection circuit, and the row detection circuit and the column detection circuit can be switched to perform detection, so that switching of different touch detection modes is realized, compatibility of self-capacitance touch detection and active pen touch detection is realized through the same multiplexer, the problems that the scanning time sequence of the conventional multiplexer is fixed and only the self-capacitance detection can be realized are effectively solved, two multiplexers are not needed, the structure is simple, the non-display area space occupied by the multiplexers is saved, and further the narrow-frame design of the touch panel is realized.

The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.

Fig. 2 is a schematic structural diagram of a touch panel according to an embodiment of the present invention, and fig. 3 is an enlarged structural diagram of the multiplexer in fig. 2, and referring to fig. 2 and fig. 3, the touch panel includes: the touch electrodes P are respectively arranged in an array along a row direction X and a column direction Y, wherein the row direction X intersects with the column direction Y, and optionally, the row direction X and the column direction Y can be vertically arranged. The number of rows and the number of columns of the touch electrode P can be set according to the required touch precision, which is not particularly limited in this embodiment, and fig. 2 illustrates an example of a touch electrode array with 5 rows and 4 columns without limitation. The touch panel further includes a multiplexing circuit 11, one end of the multiplexing circuit 11 is connected to the corresponding touch electrode P through a touch trace 13, and the other end of the multiplexing circuit 12 is connected to the corresponding control terminal 12 (pad terminal), so that a driving signal received by the control terminal 12 can be transmitted to the corresponding touch electrode P through the multiplexing circuit 11, and similarly, a detection signal output by the touch electrode P can also be transmitted to the control terminal 12 through the multiplexing circuit 11.

In this embodiment, specifically, the multiplexing circuit 11 includes a row detection circuit 111 and a column detection circuit 112, and the row detection circuit 111 and the column detection circuit 112 can be switched to operate. That is, in the touch detection process, only the row detection circuit 111 may perform touch detection, only the column detection circuit 112 may perform touch detection, or both the row detection circuit 111 and the column detection circuit 112 may be connected to a circuit to perform touch detection. The switching of the row detection circuit 111 and the column detection circuit 112 can realize different multiplexing circuits 11, and further realize different touch detection modes, so that the touch panel in the embodiment of the invention can be compatible with the existing self-capacitance touch detection and the active pen touch detection, the occupied space of the multiplexing circuits 11 is effectively reduced, the circuit design is simplified, a plurality of sets of multiplexing circuits 11 are not required to be arranged, and the manufacturing cost of the touch panel is reduced.

Optionally, in the first mode, at least one of the row detection circuit 111 and the column detection circuit 112 performs self-capacitance detection of touch; in the second mode, the column detection circuit 112 and the row detection circuit 111 perform detection to acquire the coordinates in the row direction X and the coordinates in the column direction Y of the touch point.

In this embodiment, the touch detection may include two modes: a first mode and a second mode. In the first mode, at least one of the row detection circuit 111 and the column detection circuit 112 performs self-capacitance detection of touch, that is, the row detection circuit 111 and the column detection circuit 112 can sequentially drive and detect each touch electrode P, so that a drive signal (drive waveform) and the touch electrodes P are arranged in a one-to-one correspondence manner, each touch electrode P can independently detect, multi-point touch can be realized, more touch functions can be realized by self-capacitance touch, and user experience is improved. In the first mode, one of the row detection circuit 111 and the column detection circuit 112 may be selected to perform self-capacitance detection of touch, or the row detection circuit 111 and the column detection circuit 112 may sequentially perform self-capacitance detection of touch, so as to enhance accuracy of self-capacitance touch detection and improve touch detection precision. In the second mode, the column detection circuit 112 and the row detection circuit 111 are simultaneously connected to the circuit, and the coordinates in the row direction X and the coordinates in the column direction Y are sequentially obtained for a certain touch point, so that only single-point touch can be realized in the second mode. In one example, the first mode may be a user finger tip touch detection mode, the second mode may be an active pen touch detection mode, and a single touch may satisfy the touch detection process of the active pen. Of course, the present embodiment is not limited to the above-mentioned example, in other examples, the first mode is a finger end touch detection mode, the second mode is another pressure type touch detection mode, and the present embodiment does not limit the specific forms of the first mode and the second mode.

With continued reference to fig. 3, optionally, the control end may include at least: a row control signal end row _ sw, a row input and output end row _ sx, a column control signal end cow _ sw and a column input and output end cow _ sx; the row detection circuit 111 includes a plurality of row control switching tubes T1; the column detection circuit 112 includes a plurality of column control switching tubes T2; the row control switch tubes T1 are arranged in one-to-one correspondence with the touch electrodes P; the column control switch tubes T2 are arranged in one-to-one correspondence with the touch electrodes P; the first end of the row control switch tube T1 is electrically connected to the corresponding touch electrode P through the touch trace 13; the control ends of the row control switch tubes T1 corresponding to the multiple touch electrodes P in the same row are connected to the same row control signal end row _ sw; second ends of the row control switch tubes T1 corresponding to the touch electrodes P in the same column are connected to the same row input/output end row _ sx; the first end of the column control switch tube T2 is electrically connected to the corresponding touch electrode P through the touch trace 13; the control ends of the row control switch tubes T1 corresponding to the multiple touch electrodes P in the same column are connected to the same column control signal end cow _ sw; the second terminals of the row control switch transistors T1 corresponding to the touch electrodes P in the same row are connected to the same column input/output terminal cow _ sx.

In this embodiment, the touch electrodes P are connected to the multiplexer 11 through the one-to-one corresponding touch traces 13, so that the touch electrodes P can obtain a unique driving waveform through the corresponding touch traces 13. The touch electrode array in 3 rows and 3 columns is illustrated in fig. 3, and as shown in fig. 3, the multiplexer 11 includes a row detection circuit 111 and a column detection circuit 112.

For the row detection circuit 111, a plurality of row control switch transistors T1 may be included, the row control switch transistors T1 are disposed in one-to-one correspondence with the touch electrodes P, and the control terminal of the row detection circuit 111 may include a row control signal terminal row _ sw and a row input/output terminal row _ sx. The row control switch tube T1 is disposed between the row input/output end row _ sx and the corresponding touch electrode P, and is capable of transmitting a driving waveform to the corresponding touch electrode P through the touch trace 13, the control end of the row control switch tube T1 corresponding to the multiple touch electrodes P in the same row is connected to the same row control signal end row _ sw, for example, the row control switch tube T1 corresponding to the touch electrodes P11, P12, and P13 in the same row is connected to the same row control signal end row _ sw _1, the row control switch tube T1 corresponding to the touch electrodes P14, P15, and P16 in the same row is connected to the same row control signal end row _ sw _2, and the row control switch tube T1 corresponding to the touch electrodes P17, P18, and P19 in the same row is connected to the same row control signal end row _ sw _ 3. The row control switch tubes T1 corresponding to the touch electrodes P in the same column are connected to the same row input/output port row _ sx, and the row control switch tubes T1 corresponding to the touch electrodes P in different rows and different columns are connected to different row input/output ports row _ sx. For example, the row control switch tubes T1 corresponding to the touch electrodes P11, P14 and P17 in the same column are connected to the same row input/output terminal row _ sx _3, the row control switch tubes T1 corresponding to the touch electrodes P12, P15 and P18 in the same column are connected to the same row input/output terminal row _ sx _2, and the row control switch tubes T1 corresponding to the touch electrodes P13, P16 and P19 in the same column are connected to the same row input/output terminal row _ sx _ 1.

For the column detection circuit 112, a plurality of column control switch transistors T2 may be included, the column control switch transistors T2 are disposed in one-to-one correspondence with the touch electrodes P, and the control terminal of the column detection circuit 112 may include a column control signal terminal cow _ sw and a column input/output terminal cow _ sx. The column control switch T2 is disposed between the column input/output terminal cow _ sx and the corresponding touch electrode P, and is capable of transmitting a driving waveform to the corresponding touch electrode P through the touch trace 13, wherein the control terminal of the column control switch T2 corresponding to the multiple touch electrodes P in the same column is connected to the same column input/output terminal cow _ sx, for example, the row control switch T1 corresponding to the touch electrodes P11, P14, and P17 in the same column is connected to the same column control signal terminal cow _ sw _1, the row control switch T1 corresponding to the touch electrodes P12, P15, and P18 in the same column is connected to the same column control signal terminal cow _ sw _2, and the row control switch T1 corresponding to the touch electrodes P13, P16, and P19 in the same column is connected to the same column control signal terminal cow _ sw _ 2. The column control switch T2 corresponding to the touch electrodes P in the same row is connected to the same column input/output terminal cow _ sx, and the row control switch T1 corresponding to the touch electrodes P in different columns and different rows is connected to different column input/output terminals cow _ sx. For example, the row control switch transistor T1 corresponding to the touch electrodes P11, P12 and P13 in the same row is connected to the same column input/output terminal cow _ sx _3, the row control switch transistor T1 corresponding to the touch electrodes P14, P15 and P16 in the same row is connected to the same column input/output terminal cow _ sx _2, and the row control switch transistor T1 corresponding to the touch electrodes P17, P18 and P19 in the same row is connected to the same column input/output terminal cow _ sx _ 1.

On the basis of the multiplexer shown in fig. 3, if the self-capacitance touch detection in the first mode is performed, only one of the row detection circuit 111 and the column detection circuit 112 may be controlled to perform the detection, and if only the row detection circuit 111 is controlled to perform the self-capacitance touch detection, the column control switch T2 is turned off by the column control signal terminal cow _ sw, so that the connection between the column input/output terminal cow _ sx and the touch electrode P is effectively prevented, that is, the column detection circuit 112 is turned off. The touch electrodes P are driven line by line through the line control signal end row _ sw, when the touch electrode P on the current line is driven, the other line touch electrodes P are not driven, and in one line of touch electrodes P, each touch electrode P is connected with different line input and output ends row _ sx, so that self-capacitance detection can be independently performed on each touch electrode P according to the line control signal end row _ sw and the line input and output ends row _ sx. If only the column detection circuit 112 is controlled to perform the self-capacitance touch detection, the row control switch tube T1 is turned off through the row control signal end row _ sw, so as to effectively prevent the connection between the row input/output end row _ sx and the touch electrode P, that is, turn off the row detection circuit 112. And driving the touch electrodes P row by row through the row control signal terminal cow _ sw, when the touch electrode P of the current row is driven, the other row touch electrodes P are not driven, and in one row of touch electrodes P, each touch electrode P is connected to a different row input/output terminal cow _ sx. If the row detection circuit 111 and the column detection circuit 112 both perform the self-capacitance detection once, the self-capacitance detection can be performed twice for each frame of image, thereby improving the self-capacitance detection accuracy.

In addition to the multiplexer shown in fig. 3, if the coordinate detection of the touch point in the second mode is performed, the row detection circuit 111 and the column detection circuit 112 are controlled to sequentially detect. Specifically, the column detection process can be completed by connecting the column input and output terminals cow _ sx of the column detection circuit 112 in parallel and driving the touch electrodes P column by column, thereby obtaining the coordinates of the touch points along the row direction X. In addition, the row detection process can be completed by connecting the row input and output ends row _ sx of the row detection circuit 111 in parallel and driving the touch electrodes P row by row, thereby obtaining the coordinates of the touch points in the column direction Y.

When each column input/output end cow _ sx or each row input/output end row _ sx is connected in parallel, the parallel connection process can be completed in a driving chip for inputting a driving waveform to a control end, and in addition, a switching tube can be added in the multiplexer to realize the parallel connection of each column input/output end cow _ sx or each row input/output end row _ sx. Specifically, as shown in fig. 4, fig. 4 is another schematic diagram of an enlarged structure of the multiplexer in fig. 2, and optionally, the touch panel may further include: a plurality of row parallel switch tubes T5 and column parallel switch tubes T6; at least two row input and output ends row _ sx are electrically connected through a row parallel switch tube T5; the adjacent column input and output ends cow _ sx are electrically connected through a column parallel switch tube T6; the control ends of the row parallel switch tube T5 and the column parallel switch tube T6 are both electrically connected with the second mode switch control end sw _ pen. In the second mode, the row parallel switch tube T5 and the column parallel switch tube T6 can be controlled to be turned on by the second mode switch control terminal sw _ pen, and then the row parallel switch tube T5 connects at least two row input/output terminals row _ sx in parallel, which is favorable for realizing that each row of touch electrodes P output signals in parallel, and the column parallel switch tube T6 connects at least two column input/output terminals cow _ sx, which is favorable for realizing that each column of touch electrodes P output signals in parallel. In this embodiment, the row parallel switch tube T5 and the column parallel switch tube T6 are arranged by a hardware structure, so that coordinates of a touch point in the row direction X and the column direction Y are facilitated, and the touch detection accuracy in the second mode is improved.

In summary, the multiplexing circuit 11 of the present embodiment has a simple structure, and the row detection circuit 111 and the column detection circuit 112 can switch to operate to implement self-capacitance touch detection, or operate simultaneously to perform row and column coordinate detection of touch points. The working modes of the first mode and the second mode can be compatible at the same time, the working modes can be flexibly adjusted according to user requirements, and the adaptability of the touch panel is improved, for example, the self-capacitance touch panel can be applicable to the application of an active pen.

Fig. 5 is a schematic diagram of another enlarged structure of the multiplexer in fig. 2, and optionally, the control terminal may further include: a row auxiliary signal end row _ sw _ B and a column auxiliary signal end cow _ sw _ B; the row detection circuit 111 further includes: a plurality of row auxiliary switching tubes T4; the row auxiliary switch tubes T4 are arranged corresponding to the touch electrodes P one by one; the second end of the column control switch tube T2 is electrically connected to the corresponding column input/output end cow _ sx through the corresponding row auxiliary switch tube T4; the control ends of the row auxiliary switching tubes T4 corresponding to the touch electrodes P in the same row are connected with the same row auxiliary signal end row _ sw _ B; the column detection circuit 112 further includes: a plurality of column auxiliary switching tubes T3; the column control switch tubes T2 are arranged in one-to-one correspondence with the touch electrodes P; the second end of the row control switch tube T1 is electrically connected with the corresponding row input/output end row _ sx through the corresponding column auxiliary switch tube T3; the control terminals of the column auxiliary switch tubes T3 corresponding to the touch electrodes P in the same column are connected to the same column auxiliary signal terminal cow _ sw _ B.

Compared with the multiplexer shown in fig. 3, in the present embodiment, a row auxiliary switch tube T4 is added to the row detection circuit 111 of the multiplexer, the row auxiliary switch tube T4 is disposed in one-to-one correspondence with the touch electrodes P and is used to connect the column control switch tube T2 and the corresponding column input/output terminal cow _ sx, the control terminal of the row auxiliary switch tube T4 corresponding to the multiple touch electrodes P in the same row is connected to the same row auxiliary signal terminal row _ sw _ B, and the control terminals of the row auxiliary switch tubes T4 corresponding to the multiple touch electrodes P in different rows are connected to different row auxiliary signal terminals row _ sw _ B. For example, the row auxiliary switch transistor T4 corresponding to the touch electrodes P11, P12 and P13 in the same row is connected to the same row auxiliary signal terminal row _ sw _3B, the row auxiliary switch transistors T4 corresponding to the touch electrodes P14, P15 and P16 in the same row are connected to the same row auxiliary signal terminal row _ sw _2B, and the row auxiliary switch transistors T4 corresponding to the touch electrodes P17, P18 and P19 in the same row are connected to the same row auxiliary signal terminal row _ sw _ 1B. The row auxiliary switch tube T4 can prevent the column input/output terminal cow _ sx from inputting the driving waveform to a certain touch electrode P when the row input/output terminal row _ sx inputs the driving waveform to the touch electrode P, thereby avoiding the situation of touch detection error. In addition, in the first mode, when the current touch electrode P is driven by the row input/output terminal row _ sx, the row auxiliary switch tube T4 corresponding to the other touch electrode P may be turned on, so that the column input/output terminal row _ sx outputs an auxiliary signal having the same driving waveform as the driving waveform, thereby preventing the capacitance formed between the current touch electrode P and the other touch electrode P from affecting the accuracy of the self-capacitance detection. It should be noted that, in the second mode, all the auxiliary signal terminals are not working, for example, the auxiliary signal terminals can be connected to a zero potential, because the driving signal of the active pen mode is transmitted by the active capacitive pen itself, and the touch panel only performs the signal receiving function.

Compared with the multiplexer shown in fig. 3, in the present embodiment, a column auxiliary switch tube T3 is added to the column detection circuit 112 of the multiplexer, the column auxiliary switch tube T3 is disposed in one-to-one correspondence with the touch electrodes P and is used to connect the row control switch tube T1 and the corresponding row input/output end row _ sx, the control end of the column auxiliary switch tube T3 corresponding to the multiple touch electrodes P in the same column is connected to the same column auxiliary signal end cow _ sw _ B, and the control end of the column auxiliary switch tube T3 corresponding to the multiple touch electrodes P in different columns is connected to different column auxiliary signal ends cow _ sw _ B. For example, the column auxiliary switch transistor T3 corresponding to the touch electrodes P11, P14 and P17 in the same column is connected to the same column auxiliary signal terminal cow _ sw _3B, the column auxiliary switch transistors T3 corresponding to the touch electrodes P12, P15 and P18 in the same column are connected to the same column auxiliary signal terminal cow _ sw _2B, and the column auxiliary switch transistors T3 corresponding to the touch electrodes P13, P16 and P19 in the same column are connected to the same column auxiliary signal terminal cow _ sw _ B. The column auxiliary switch tube T3 can prevent the row input/output port row _ sx from inputting the driving waveform to a touch electrode P when the column input/output port cow _ sx inputs the driving waveform to the touch electrode P, thereby avoiding the touch detection error. In addition, in the first mode, when the current touch electrode P is driven by the column input/output terminal cow _ sx, the column auxiliary switch tube T3 corresponding to the other touch electrode P may be turned on, so that the row input/output terminal row _ sx outputs an auxiliary signal having the same driving waveform as the driving waveform, thereby preventing the capacitance from being formed between the current touch electrode P and the other touch electrode P and affecting the accuracy of self-capacitance detection.

With reference to fig. 5, optionally, when the row detection circuit 111 performs detection, if the row control switch tube T1 corresponding to the touch electrode P is in an on state, the row auxiliary switch tube T4 corresponding to the touch electrode P is in an off state; if the column auxiliary switch tube T4 corresponding to the touch electrode P is in an on state, the column control switch tube T1 corresponding to the touch electrode P is in an off state; when the column detection circuit 112 detects that the column control switch T2 corresponding to the touch electrode P is in an on state, the column auxiliary switch T3 corresponding to the touch electrode P is in an off state; if the auxiliary row switch T3 corresponding to the touch electrode P is turned on, the control row switch T2 corresponding to the touch electrode P is turned off.

The row auxiliary switch tube T4 may prevent the column input/output terminal cow _ sx from inputting the driving waveform to a certain touch electrode P when the row input/output terminal cow _ sx inputs the driving waveform to the certain touch electrode P, and similarly, the column auxiliary switch tube T3 may prevent the row input/output terminal cow _ sx from inputting the driving waveform to the certain touch electrode P when the column input/output terminal cow _ sx inputs the driving waveform to the certain touch electrode P. For example, for the multiplexer shown in fig. 3, if the touch electrode P11 obtains the driving signal via the row control signal port row _ sw _1, and if the column input/output port cow _ sx _ inputs the auxiliary signal to the touch electrode P11, the touch electrode P11 is prone to generate signal crosstalk, and the embodiment effectively avoids the crosstalk through the row auxiliary switch transistor T4 and the column auxiliary switch transistor T3.

When the column detection circuit 112 performs detection, switching tubes controlled by col _ sw _1 and col _ sw _1B, col _ sw _2 and col _ sw _2B, col _ sw _3 and col _ sw _3B are switch pairs with opposite switch states, and can control the touch electrode columns P11/P14/P17, P12/P15/P18 and P13/P16/P19 to output detection signals through col _ sx1/2/3 at different times; when the row detection circuit 111 performs detection, the switch pairs controlled by the row _ sw _1, the row _ sw _1B, the row _ sw _2B, and the row _ sw _3B are switch pairs with opposite switch states, so that the touch electrode columns C21/C24/C27, C20/C23/C26, and C19/C22/C25 can be controlled to output detection signals through the row _ sx1/2/3 at different time intervals, and the column auxiliary signal terminal cow _ sw _ B and the row auxiliary signal terminal cow _ sw can effectively prevent the touch electrodes from generating signal crosstalk, thereby effectively avoiding inaccurate detection signals.

Fig. 6 is a schematic cross-sectional structure view of the touch panel in fig. 2 along the column direction Y, referring to fig. 2 and fig. 6, optionally, the touch panel may further include: a substrate 21; a pixel driving circuit layer 22 disposed on one side of the substrate 21; the pixel drive circuit layer 22 includes a plurality of pixel drive circuits; the multiplexing circuit is disposed in the pixel driving circuit layer 22; a plurality of sub-pixels 25 disposed on a side of the substrate 21 away from the pixel driving circuit layer 22; the sub-pixels are electrically connected with the corresponding pixel driving circuits; in a plane parallel to the substrate 21, the projection of the touch electrode P covers a plurality of sub-pixels 25; the packaging layer 23 is arranged between the sub-pixel and the touch electrode P; the touch lead 13 is arranged between the packaging layer 23 and the touch electrode P; the touch panel comprises a display area AA and a non-display area NA surrounding the display area; the sub-pixels 25 and the touch electrodes P are disposed in the display area AA; the multiplexing circuit is arranged in the non-display area NA; the touch lead 13 is electrically connected to the multiplexing circuit in the non-display area NA not covered by the packaging layer 23.

In this embodiment, the touch panel may be a panel having only a touch function, that is, the touch electrode and the touch trace are disposed on the substrate, and then the touch trace is attached to the display side of the display panel to implement the touch function of the display panel. Of course, as shown in fig. 2, the touch panel may be a display panel integrated with a touch function. Specifically, as shown in fig. 2 and 6, the touch panel may include a substrate 21, and a pixel driving circuit layer 22, a sub-pixel 25, an encapsulation layer 23, a touch lead 13, and a touch electrode P sequentially distant from the substrate 21. The pixel driving circuit layer 22 includes pixel driving circuits corresponding to the sub-pixels 25 one by one, and is configured to drive the sub-pixels 25 to emit light, and a projection of the touch electrode P covers the sub-pixels 25 in a plane parallel to the substrate 21, that is, the arrangement density of the touch electrode P is smaller than that of the sub-pixels 25. An insulating layer 24 is arranged between the touch lead 13 and the touch electrode P, and the touch panel comprises a display area AA and a non-display area NA surrounding the display area; the sub-pixels 25 and the touch electrodes P are disposed in the display area AA; the multiplexing circuit is arranged in the non-display area NA; the edge of the encapsulation layer 23 extends to the non-display area NA, and the touch lead 13 is electrically connected to the multiplexing circuit 11 of the pixel driving circuit layer 22 in the non-display area NA not covering the encapsulation layer 23, so that the touch lead 13 does not penetrate through the encapsulation layer 23 to be electrically connected to the multiplexing circuit 11, but bypasses the encapsulation layer 23 to be electrically connected to the multiplexing circuit 11, the encapsulation layer 23 is not damaged, and the encapsulation effect of the touch panel is improved. In this embodiment, a polarizer 25 and a glass cover plate 26 may be further disposed on a side of the touch electrode P away from the substrate 21 to enhance the strength of the touch panel and improve the display effect of the touch panel.

With continued reference to fig. 2, the non-display area NA may alternatively include a first non-display area NA1 and a second non-display area NA2 located at opposite sides of the display area AA in the row direction X; and a third non-display area NA3 and a fourth non-display area NA4 located at opposite sides of the display area AA in the column direction Y; the bound area 14 is located in the fourth non-display area NA 4; the binding area 14 is used for binding the flexible circuit board or the touch chip; the binding area 14 is provided with a plurality of control terminals 12. In this embodiment, the non-display area NA is disposed around the display area AA, and the non-display area NA may be divided into: the first and second non-display areas NA1 and NA2 located at opposite sides of the display area AA in the row direction X, and the third and fourth non-display areas NA3 and NA4 located at opposite sides of the display area AA in the column direction Y. The fourth non-display area NA4 is generally referred to as a lower frame area of the touch panel, the control terminal 12 is disposed in the lower frame area, an area where the control terminal 12 is disposed is a bonding area 14 in this embodiment, the bonding area 14 in this embodiment may be a Chip On Film (COF) package structure, that is, the flexible circuit board is bonded to the control terminal 12 of the bonding area 14, the touch Chip may be disposed On the flexible circuit board and bent to a side of the touch panel close to the substrate 21 along with the flexible circuit board, and the touch Chip transmits a driving signal to the control terminal 12 through the flexible circuit board. Alternatively, in this embodiment, the bonding area 14 may be a package structure in which a chip is directly bonded on glass (COG), that is, the touch chip is directly bonded on the control end 12 of the bonding area 14. The present embodiment does not particularly limit the setting of the binding region 14. As shown in fig. 2, the multiplexing circuit 11 may be disposed in the fourth non-display area NA4, that is, the lower frame area of the display panel, occupying the lower frame space.

Fig. 7 is a schematic structural diagram of another touch panel according to an embodiment of the present invention, in which the touch lead 13 optionally extends along the column direction Y; one of the row detecting circuit 111 and the column detecting circuit 112 is disposed in the third non-display area NA3, and the other detecting circuit is disposed in the fourth non-display area NA 4. In order to further reduce the space occupied by the lower frame of the touch panel, one of the row detection circuit 111 and the column detection circuit 112 may be disposed in the third non-display area NA3, and the other may be disposed in the fourth non-display area NA4, for example, the row detection circuit 111 may be disposed in the third non-display area NA3, and the column detection circuit 112 may be disposed in the fourth non-display area NA4, so that the space of each frame of the touch panel is reasonably and comprehensively utilized, and the width of the lower frame is reduced.

Optionally, the sensing circuit disposed in the third non-display area NA3 is connected to the control terminal 12 of the bonding area 14 through control leads disposed in the first non-display area NA1 and the second non-display area NA 2. The through touch lead 13 is connected to the detection circuit of the third non-display area NA3 and the detection circuit of the fourth non-display area NA4, respectively, the touch lead 13 is connected to the detection circuit at a position where the third non-display area NA3 has no package layer 23, and the control terminal 12 is connected to the detection circuit of the third non-display area NA3 through the control lead 113 disposed in the first non-display area NA1 and the second non-display area NA 2.

Fig. 8 is a schematic structural diagram of another touch panel according to an embodiment of the present invention, where, optionally, the touch leads 13 extend along the row direction X; one of the row detecting circuit 111 and the column detecting circuit 112 is disposed in the first non-display area NA1, and the other detecting circuit is disposed in the second non-display area NA 2. The row detection circuit 111 and the column detection circuit 112 may be respectively disposed in the first non-display area NA1 and the second non-display area NA2, and the multiplexing circuit is not disposed in the lower frame area (the fourth non-display area NA4), so that the width of the lower frame is further reduced, and the space of the left and right frames of the touch panel is reasonably utilized. The through touch lead 13 is connected to the detection circuit of the first non-display area NA1 and the detection circuit of the second non-display area NA2, respectively, the through touch lead 13 is connected to the detection circuit at a position without the package layer 23 in the lower frame area, and the control terminal 12 is connected to the detection circuits of the first non-display area NA1 and the second non-display area NA2 through the control lead 113 provided in the lower frame area.

Based on the same concept, the embodiment of the invention also provides a driving method of the touch panel, which is suitable for the touch panel provided by any embodiment of the invention. Fig. 9 is a flowchart illustrating a driving method of a touch panel according to an embodiment of the present invention, and as shown in fig. 9, the method of the embodiment includes the following steps:

step S110, in the first mode, each frame of image is subjected to self-capacitance detection of touch by at least one of a row detection circuit or a column detection circuit.

Step S120, in the second mode, each frame of image is detected by the column detection circuit and the row detection circuit to obtain the coordinates of the touch point along the row direction and the coordinates of the touch point along the column direction.

In the embodiment of the invention, the touch panel comprises touch electrodes arranged in an array, and the control end capable of outputting the control signal is connected with the corresponding touch electrode through the multiplexer so as to drive the touch electrode. The multiplexing circuit comprises a row detection circuit and a column detection circuit, and the row detection circuit and the column detection circuit can be switched to perform detection, so that different touch modes can be switched, specifically, in a first mode, self-capacitance detection of touch is performed only through at least one of the row detection circuit or the column detection circuit, in a second mode, the column detection circuit and the row detection circuit are simultaneously switched into the circuits to obtain coordinates of touch points along the row direction and the column direction, so that two different touch modes are compatible, the compatibility of self-capacitance touch detection and active pen touch detection can be realized through the same multiplexer, the scanning time sequence of the existing multiplexer is effectively fixed, and only the self-capacitance detection can be realized, the embodiment of the invention does not need to arrange two multiplexers, has simple structure, and saves a non-display area space occupied by the multiplexer, and further realizing the narrow frame design of the touch panel.

With continued reference to fig. 3, optionally, the row detection circuit 111 includes a plurality of row control switch transistors T1; the column detection circuit 112 includes a plurality of column control switching tubes T2; the row control switch tubes T1 are arranged in one-to-one correspondence with the touch electrodes P; the column control switch tubes T2 are arranged in one-to-one correspondence with the touch electrodes P; the first end of the row control switch tube T1 is electrically connected to the corresponding touch electrode P through the touch trace 13; the control ends of the row control switch tubes T1 corresponding to the touch electrodes P in the same row are connected with the same row control signal end row _ sw; second ends of the row control switch tubes T1 corresponding to the touch electrodes P in the same column are connected to the same row input/output end row _ sx; the first end of the column control switch tube T2 is electrically connected to the corresponding touch electrode P through the touch trace 13; the control ends of the row control switch tubes T1 corresponding to the multiple touch electrodes P in the same column are connected to the same column control signal end cow _ sw; the second terminals of the row control switch transistors T1 corresponding to the touch electrodes P in the same row are connected to the same column input/output terminal cow _ sx.

Optionally, in the first mode, the self-capacitance detection of touch by each frame of image through one of the row detection circuit and the column detection circuit includes: in a first mode, conducting row control switch tubes corresponding to the touch control electrodes line by line through a plurality of row control signals in each frame of image; when the row control switch tube is conducted, the plurality of row input and output ends are connected with the driving waveform and read the detection signal; or, in the first mode, each frame of image is conducted with the column control switch tubes corresponding to the touch control electrodes column by column through a plurality of column control signals; when the column control switch tube is conducted, the plurality of column input and output ends are connected with the driving waveform and read the detection signal.

Fig. 10 is a driving timing diagram of a first mode according to an embodiment of the present invention, fig. 11 is a driving timing diagram of another first mode according to an embodiment of the present invention, fig. 10 is a specific timing sequence of self-capacitance detection performed by the row detection circuit 111, referring to fig. 3 and fig. 10, for the multiplexer shown in fig. 3, in the first mode, the row control signals row _ sw _1, row _ sw _2, and row _ sw _3 are sequentially controlled per frame of image, so as to turn on the row control switch tubes T1 corresponding to the touch electrodes P row by row, and when the row control switch tube T1 corresponding to a certain row touch electrode P is turned on, the plurality of row input/output terminals row _ sx _1, row _ sx _2, and row _ sx _3 access the driving waveforms and read the detection signals, so that each touch electrode P in the row touch electrode P corresponds to a different row input/output terminal, each touch electrode P receives a one-to-one driving waveform, and realizing self-capacitance detection. Illustratively, the driving waveform can be a square wave or a sine wave between 50kHz and 500kHz, and the voltage is between 0.1V and 40V. It should be noted that in the timing diagram of the present embodiment, the ON stage of the switching tube is labeled, and the sending stage of the input/output end inputting the driving waveform or the detection signal is labeled.

Fig. 11 is a specific timing sequence of the column detection circuit 112 for performing self-capacitance detection, and referring to fig. 3 and fig. 10, for the multiplexer shown in fig. 3, in the first mode, the column control signals cow _ sw _1, cow _ sw _2, and cow _ sw _3 are sequentially controlled per frame of image, so as to turn on the column control switch tube T2 corresponding to the touch electrode P column by column, and when the column control switch tube T2 corresponding to a certain column touch electrode P is turned on, the plurality of column input and output terminals cow _ sx _1, cow _ sx _2, and cow _ sx _3 are switched in the driving waveform and read the detection signal, so that each touch electrode P in the column touch electrode P corresponds to a different column input and output terminal, and each touch electrode P receives a one-to-one driving waveform, thereby implementing self-capacitance detection.

In general, in this embodiment, one of the row detection circuit 111 and the column detection circuit 112 may be selected for self-capacitance touch detection. Each frame of image may be detected once by the row detection circuit 111 and the column detection circuit, respectively. Optionally, when one of the row detection circuit 111 and the column detection circuit 112 is selected to perform self-capacitance touch detection, self-capacitance detection may be performed on one frame of image through the row detection circuit 111, self-capacitance detection may be performed on the next frame of image through the column detection circuit 112, and self-capacitance detection may be performed on the next frame of image through the row detection circuit 111.

Optionally, the number of rows of the touch electrodes arranged in the array is multiple; the number of rows of touch electrodes arranged in an array is multiple; in a second mode, each frame of image is detected by a column detection circuit and a row detection circuit to obtain coordinates of a touch point along a row direction and coordinates of the touch point along a column direction, including: in the column detection stage, the column control switch tubes corresponding to the touch control electrodes are conducted column by column through a plurality of column control signals; when the column control switch tubes are conducted, the plurality of column input and output ends are connected in parallel to output detection signals so as to obtain coordinates of the touch points along the row direction; in the line detection stage, line control switch tubes corresponding to the touch control electrodes are conducted line by line through a plurality of line control signals; when the row control switch tube is conducted, the plurality of row input and output ends are connected in parallel to output detection signals so as to obtain the coordinates of the touch points along the column direction.

Fig. 12 is a driving timing diagram of a second mode according to an embodiment of the present invention, with reference to fig. 3 and 12, in the second mode, in the column detection stage, the column control signals cow _ sw _1, cow _ sw _2 and cow _ sw _3 are sequentially controlled, the column control switch tubes T2 corresponding to the touch electrodes are turned on column by column, when a certain column control switch tube T2 is turned on, the column input/output terminals cow _ sx _1, cow _ sx _2 and cow _ sx _3 output detection signals in parallel, and if the column control switch tube T2 is turned on, the detection signal appears at the column input/output terminal, the touch point is determined to be located at the column touch electrode, so that the coordinate of the touch point along the row direction X can be determined. Similarly, in the row detection stage, the row control signals row _ sw _1, row _ sw _2 and row _ sw _3 are sequentially controlled to turn on the row control switch tubes T1 corresponding to the touch electrodes row by row, when a certain row control switch tube T1 is turned on, the row input and output ends row _ sx _1, row _ sx _2 and row _ sx _3 output detection signals in parallel, and if the row control switch tube T1 is turned on, the detection signal appears at the row input and output end, it is determined that the touch point is located at the row touch electrode, so that the coordinate of the touch point along the column direction Y can be determined.

With continued reference to fig. 4, if the input/output ends row _ sx of adjacent rows are electrically connected through the row parallel switch tube T5; the adjacent column input and output terminals cow _ sx are electrically connected through the column parallel switch tube T6, and in the second mode, the row parallel switch tube T5 and the column parallel switch tube T6 need to be controlled to be completely conducted through the second mode switch control terminal sw _ pen, so that the parallel connection of the row input and output terminals is realized, and the parallel connection of the column input and output terminals is realized.

It should be noted that, the implementation of the present invention is that the driving waveforms input to the touch electrodes by the routine input/output terminals and the column input/output terminals are at a high level, and the control terminals of the switch tubes are all turned on at a low level, which is only one implementation manner. The present embodiment includes, but is not limited to, the implementation manner in the present embodiment.

Optionally, in the second mode, detecting each frame of image by the column detection circuit and the row detection circuit to obtain the coordinates of the touch point along the row direction and the coordinates of the touch point along the column direction may include: in the column detection stage, column control switch tubes corresponding to the multiple columns of touch control electrodes are conducted simultaneously through multiple column control signals; when the column control switch tube is conducted, the plurality of column input and output ends respectively output detection signals to obtain the coordinates of the active pen along the column direction; in the row detection stage, row control switch tubes corresponding to the multiple rows of touch control electrodes are conducted simultaneously through multiple row control signals; when the row control switch tube is conducted, the plurality of row input and output ends respectively output detection signals to obtain the coordinates of the active pen along the row direction.

In addition, the output of the detection signal can be realized in other ways besides through the row parallel switch tube T5 and the column parallel switch tube T6, and the coordinates of the touch point are indicated. Fig. 13 is a driving timing diagram of another second mode according to the embodiment of the invention, with reference to fig. 3 and 13, in the second mode, in the column detection stage, the column control signals cow _ sw _1, cow _ sw _2 and cow _ sw _3 are controlled, the column control switch T2 corresponding to each column touch electrode is turned on, when a certain column control switch T2 is turned on, the column input/output terminals cow _ sx _1, cow _ sx _2 and cow _ sx _3 output the detection signals, respectively, and if the column input/output terminal cow _ sx _1 outputs the detection signal, the touch point is determined to be located on the row where the touch electrodes P17, P18 and P19 are located, so that the coordinate of the touch point along the column direction Y can be determined. Similarly, in the row detection stage, the row control signals row _ sw _1, row _ sw _2 and row _ sw _3 are controlled, the row control switch tubes T1 corresponding to the touch electrodes in each row are turned on, when a certain row control switch tube T1 is turned on, the row input/output terminals row _ sx _1, row _ sx _2 and row _ sx _3 output detection signals, respectively, and if the row input/output terminal row _ sx _1 outputs a detection signal, it is determined that the touch points are located in the columns of the touch electrodes P17, P18 and P19, so that the coordinates of the touch points along the row direction X can be determined. According to the embodiment, through the change of the time sequence, the row parallel switch tube T5 and the column parallel switch tube T6 are not required to be arranged, the multiplexing circuit can be effectively simplified, and the panel cost is reduced.

With continued reference to fig. 4, optionally, the row detection circuit 111 may further include: a plurality of row auxiliary switching tubes T4; the row auxiliary switch tubes T4 are arranged corresponding to the touch electrodes P one by one; the second end of the column control switch tube T2 is electrically connected to the corresponding column input/output end cow _ sx through the corresponding row auxiliary switch tube T4; the control ends of the row auxiliary switching tubes T4 corresponding to the touch electrodes P in the same row are connected with the same row auxiliary signal end row _ sw _ B; the column detection circuit 112 further includes: a plurality of column auxiliary switching tubes T3; the column control switch tubes T2 are arranged in one-to-one correspondence with the touch electrodes P; the second end of the row control switch tube T1 is electrically connected with the corresponding row input/output end row _ sx through the corresponding column auxiliary switch tube T3; the control terminals of the column auxiliary switch tubes T3 corresponding to the touch electrodes P in the same column are connected to the same column auxiliary signal terminal cow _ sw _ B.

Optionally, in the first mode, the self-capacitance detection of touch by each frame of image through one of the row detection circuit and the column detection circuit includes: when the row detection circuit detects, each frame of image conducts row control switch tubes corresponding to the touch control electrodes row by row through a plurality of row control signals; if the row control switch tube corresponding to the touch electrode is in a conducting state, the row auxiliary switch tube corresponding to the touch electrode is in a disconnecting state; if the row auxiliary switch tube corresponding to the touch electrode is in a conducting state, the row control switch tube corresponding to the touch electrode is in a switching-off state; the column control switch tube and the column auxiliary switch tube are all conducted; when the row control switch tube is conducted, the plurality of row input and output ends are connected with the driving waveform and read the detection signal, and the plurality of column input and output ends are connected with the driving waveform; or when the column detection circuit detects, each frame of image conducts the column control switch tubes corresponding to the touch control electrodes column by column through a plurality of column control signals; if the row control switch tube corresponding to the touch electrode is in a conducting state, the row auxiliary switch tube corresponding to the touch electrode is in a switching-off state; if the column auxiliary switch tube corresponding to the touch electrode is in a conducting state, the column control switch tube corresponding to the touch electrode is in a switching-off state; the row control switch tube and the row auxiliary switch tube are all conducted; when the column control switch tube is conducted, the plurality of column input and output ends are connected with the driving waveform and read the detection signal, and the plurality of row input and output ends are connected with the driving waveform.

Fig. 14 is a driving timing diagram of another first mode according to an embodiment of the present invention, referring to fig. 4 and fig. 10, regarding the multiplexer shown in fig. 4, a row auxiliary switch T4 and a column auxiliary switch T3 are added, so that in the first mode, when the current touch electrode P is driven by the column input/output terminal cow _ sx, the column auxiliary switch T3 corresponding to the other touch electrode P can be turned on, so that the row input/output terminal row _ sx outputs an auxiliary signal with the same driving waveform to the other touch electrode P, thereby preventing a capacitance from being formed between the current touch electrode P and the other touch electrode P, and affecting the accuracy of self-capacitance detection. Optionally, the auxiliary signal is the same as the driving waveform, but only as an auxiliary drive, and the output signal of the row input/output port row _ sx is not read. Only the detection signal output from the column input/output terminal cow _ sx is read. Similarly, when the current touch electrode P is driven by the row input/output port row _ sx, the other touch electrodes P can obtain the auxiliary signal from the column input/output port cow _ sx.

Specifically, in the first mode, when the row detection circuit 111 performs detection, each frame of image controls the row control switch tubes T1 corresponding to the touch electrodes P to be turned on row by row, and when the row control switch tube T1 corresponding to a certain row of touch electrodes P is turned on, for example, the row control switch tube T1 of a row of touch electrodes P corresponding to the row control signal row _ sw _1 is turned on, the row auxiliary switch tube T4 corresponding thereto is controlled to be turned off, that is, the row auxiliary signal row _ sw _1B controls the row auxiliary switch tube T4 to be turned off, and the connection between the column input/output terminal cow _ sx and the row touch electrode P is turned off, so that the drive waveform of the column input/output terminal cow _ sx is not received while the touch electrode P receives the drive waveform of the row input/output terminal cow _ sx. The column auxiliary switch T3 is turned on, so that each touch electrode P in the row of touch electrodes P receives the driving waveform of a different row input/output port row _ sx. At this time, the column control switch T2 is turned on, and the row auxiliary signal terminals row _ sw _2B and row _ sw _2B except the row auxiliary signal terminal row _ sw _1B control the row auxiliary switch T4 of the other row touch electrodes P to be turned on, so that the column input/output terminal row _ sx outputs an auxiliary signal (the same as a driving waveform) to the other touch electrodes P. And then, carrying out self-capacitance detection on the touch electrodes P line by line.

With continued reference to fig. 4 and 10, in the first mode, when the column detection circuit 112 performs detection, each frame of image controls the column control signals cow _ sw _1, cow _ sw _2 and cow _ sw _3, so as to turn on the column control switch tube T2 corresponding to the touch electrode P column by column, and when the column control switch tube T2 corresponding to a certain column of touch electrode P is turned on, for example, the column control switch tube T2 of a column of touch electrode P corresponding to the column control signal cow _ sw _1 is turned on, the column auxiliary switch tube T3 corresponding thereto is controlled to be turned off, that is, the column auxiliary signal cow _ sw _1B controls the column auxiliary switch tube T3 to be turned off, and the connection between the row input/output port row _ sx and the column touch electrode P is turned off, so as to avoid receiving the driving waveform of the row input/output port row _ sx while the touch electrode P receives the driving waveform of the column input/output port cow _ sx. The row auxiliary switch T4 is turned on, so that each touch electrode P in the row of touch electrodes P receives the driving waveform of a different row input/output terminal cow _ sx. At this time, the row control switch tubes T1 are all turned on, and the row auxiliary signal ends row _ sw _2B and row _ sw _2B except the column auxiliary signal end cow _ sw _1B control the column auxiliary switch tubes T3 of the other column touch electrodes P to be turned on, so that the row input/output end row _ sx outputs an auxiliary signal (the same as a driving waveform) to the other touch electrodes P. And then, carrying out self-capacitance detection on the touch electrodes P line by line.

Optionally, in the second mode, each frame of image is detected by the column detection circuit and the row detection circuit to obtain coordinates of the touch point along the row direction and coordinates of the touch point along the column direction, including: in the column detection stage, column control switch tubes corresponding to the multiple columns of touch control electrodes are conducted simultaneously through multiple column control signals; the auxiliary column switch tubes corresponding to the multiple columns of touch electrodes are turned off simultaneously through the auxiliary column signals; the row control switch tubes corresponding to the multiple rows of touch control electrodes are turned off simultaneously through multiple row control signals; simultaneously conducting row auxiliary switch tubes corresponding to the multiple rows of touch electrodes through multiple row auxiliary signals; when the column control switch tubes are conducted, the plurality of column input and output ends respectively output detection signals to acquire coordinates of the touch points along the column direction; in the row detection stage, the column control switch tubes corresponding to the multiple columns of touch control electrodes are simultaneously turned off through multiple column control signals; simultaneously conducting the column auxiliary switch tubes corresponding to the multiple columns of touch electrodes through the multiple column auxiliary signals; the row control switch tubes corresponding to the multiple rows of touch control electrodes are conducted simultaneously through multiple row control signals; simultaneously turning off row auxiliary switch tubes corresponding to the multiple rows of touch electrodes through multiple row auxiliary signals; when the row control switch tube is conducted, the plurality of row input and output ends respectively output detection signals to obtain the coordinates of the touch points along the row direction.

Fig. 15 is a driving timing diagram of another second mode according to the embodiment of the present invention, in the second mode, except for the row parallel switch T5 and the column parallel switch T6, the output of the detection signal may be implemented in other ways, and the coordinates of the touch point are indicated, so as to simplify the multiplexing circuit and reduce the panel cost.

With continued reference to fig. 4 and 15, in the second mode, in the column detection phase, the column control signals cow _ sw _1, cow _ sw _2 and cow _ sw _3 are controlled to turn on the column control switch tube T2 corresponding to each column touch electrode, the column auxiliary signals cow _ sw _1B, cow _ sw _2B and cow _ sw _3B turn off the column auxiliary switch tube T3 corresponding to the multi-column touch electrode, the row control signals row _ sw _1, row _ sw _2 and row _ sw _3 turn off the row control switch tube T1 simultaneously, so as to disconnect the touch electrode P from the row input and output terminals, the row auxiliary signals row _ sw _1, row _ sw _2 and row _ sw _3 turn on the auxiliary signal T4 simultaneously, and when the column control switch tube T2 corresponding to each column touch electrode P is turned on, the column input and output terminals cow _ sw _ sx _1, cow _ sw _2 and cow _ sw _3 output detection signals respectively, for example, if the column input/output terminal cow _ sx _1 outputs the detection signal, the touch point is determined to be located on the row where the touch electrodes P17, P18, and P19 are located, and thus the coordinate of the touch point in the column direction Y can be determined. Similarly, in the row detection phase, row control signals row _ sw _1, row _ sw _2 and row _ sw _3 are controlled to simultaneously turn on row control switch transistors T1 corresponding to each row of touch electrodes, row auxiliary signals row _ sw _1B, row _ sw _2B and row _ sw _3B simultaneously turn off row auxiliary switch transistors T4 corresponding to a plurality of rows of touch electrodes, column control signals cow _ sw _1, cow _ sw _2 and cow _ sw _3B simultaneously turn off column control switch transistors T2 corresponding to each column of touch electrodes, so as to disconnect the touch electrodes P from the column input and output terminals, column auxiliary signals cow _ sw _1B, cow _ sw _2B and cow _ sw _3B simultaneously turn on column auxiliary switch transistors T3 corresponding to a plurality of columns of touch electrodes, row input and output terminals row _ sx _1, row _ sx _2 and row _ sx _3 respectively detect row input and output signals row _ sw _1, it is determined that the touch point is located at the column where the touch electrodes P17, P18, and P19 are located, and thus the coordinate of the touch point in the row direction X can be determined. According to the embodiment, through the change of the time sequence, the row parallel switch tube T5 and the column parallel switch tube T6 are not required to be arranged, the multiplexing circuit can be effectively simplified, and the panel cost is reduced.

The embodiment of the invention also provides a display device. Fig. 16 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 16, the display device according to the embodiment of the present invention includes a touch panel 1 according to any embodiment of the present invention. The display device may be a display screen of a mobile phone as shown in fig. 16, or may be a display screen of an electronic device such as a computer, a television, and an intelligent wearable device, which is not particularly limited in this embodiment.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A touch panel, comprising:

the multiplexing circuit comprises a row detection circuit and a column detection circuit; the row detection circuit and the column detection circuit can be switched to detect.

2. The touch panel of claim 1,

in a first mode, at least one of the row detection circuit and the column detection circuit performs self-capacitance detection of touch; in a second mode, the column detection circuit and the row detection circuit perform detection to acquire coordinates in a row direction and coordinates in a column direction of the touch point.

3. The touch panel of claim 1, wherein the control terminal comprises: a row control signal terminal, a row input/output terminal, a column control signal terminal and a column input/output terminal;

the row detection circuit comprises a plurality of row control switch tubes; the column detection circuit comprises a plurality of column control switch tubes; the row control switch tubes and the touch electrodes are arranged in a one-to-one correspondence manner; the column control switch tubes and the touch electrodes are arranged in a one-to-one correspondence manner;

the first ends of the row control switch tubes are electrically connected with the corresponding touch electrodes through touch wires; the control ends of the row control switch tubes corresponding to the plurality of touch control electrodes in the same row are connected with the same row control signal end; second ends of the row control switch tubes corresponding to the plurality of touch control electrodes in the same column are connected with the same row input and output end;

the first ends of the column control switch tubes are electrically connected with the corresponding touch electrodes through the touch wires; the control ends of the row control switch tubes corresponding to the multiple touch control electrodes in the same column are connected with the same column control signal end; and second ends of the row control switch tubes corresponding to the touch electrodes in the same row are connected with the same column input and output end.

4. The touch panel of claim 3, wherein the control terminal further comprises: a row auxiliary signal terminal and a column auxiliary signal terminal;

the row detection circuit further includes: a plurality of row auxiliary switching tubes; the row auxiliary switch tubes and the touch electrodes are arranged in a one-to-one correspondence manner;

the second ends of the column control switch tubes are electrically connected with the input and output ends of the corresponding columns through the corresponding row auxiliary switch tubes; the control ends of the row auxiliary switch tubes corresponding to the plurality of touch electrodes in the same row are connected with the same row auxiliary signal end;

the column detection circuit further includes: a plurality of column auxiliary switching tubes; the column control switch tubes and the touch electrodes are arranged in a one-to-one correspondence manner;

the second ends of the row control switch tubes are electrically connected with the corresponding row input and output ends through the corresponding column auxiliary switch tubes; and the control ends of the column auxiliary switch tubes corresponding to the plurality of touch electrodes in the same column are connected with the same column auxiliary signal end.

5. The touch panel of claim 4,

when the row detection circuit detects, if the row control switch tube corresponding to the touch electrode is in a conducting state, the row auxiliary switch tube corresponding to the touch electrode is in a disconnecting state; if the row auxiliary switch tube corresponding to the touch electrode is in a conducting state, the row control switch tube corresponding to the touch electrode is in a switching-off state;

when the column detection circuit detects, if the column control switch tube corresponding to the touch electrode is in a conducting state, the column auxiliary switch tube corresponding to the touch electrode is in a switching-off state; and if the row of auxiliary switch tubes corresponding to the touch electrode is in a conducting state, the row of control switch tubes corresponding to the touch electrode is in a disconnecting state.

6. The touch panel according to claim 3, further comprising: a plurality of row parallel switch tubes and column parallel switch tubes;

at least two row input and output ends are electrically connected through the row parallel switch tube; the adjacent column input and output ends are electrically connected through the column parallel switch tube;

and the control ends of the row parallel switch tubes and the column parallel switch tubes are electrically connected with the control end of the second mode switch.

7. The touch panel according to claim 1, further comprising: a substrate;

the pixel driving circuit layer is arranged on one side of the substrate; the pixel driving circuit layer comprises a plurality of pixel driving circuits; the multiplexing circuit is arranged on the pixel driving circuit layer;

the plurality of sub-pixels are arranged on one side of the substrate far away from the pixel driving circuit layer; the sub-pixels are electrically connected with the corresponding pixel driving circuits; in a plane parallel to the substrate, a projection of the touch electrode covers a plurality of the sub-pixels;

the packaging layer is arranged between the sub-pixels and the touch electrode;

the touch lead is arranged between the packaging layer and the touch electrode;

the touch panel comprises a display area and a non-display area surrounding the display area; the sub-pixels and the touch electrode are arranged in the display area; the multiplexing circuit is arranged in the non-display area; the touch lead is electrically connected with the multiplexing circuit in a non-display area which does not cover the packaging layer.

8. The touch panel of claim 7, wherein the non-display area comprises a first non-display area and a second non-display area on opposite sides of the display area along a row direction; and a third non-display area and a fourth non-display area located on opposite sides of the display area along the column direction; the binding area is positioned in the fourth non-display area; the binding region is used for binding the flexible circuit board or the touch chip;

the binding area is provided with a plurality of control terminals.

9. The touch panel of claim 8, wherein the touch lead extends in a column direction;

one of the row detection circuit and the column detection circuit is disposed in the third non-display region, and the other detection circuit is disposed in the fourth non-display region.

10. The touch panel of claim 9, wherein the detection circuit disposed in the third non-display area is connected to the control terminal of the bonding area through control leads disposed in the first non-display area and the second non-display area.

11. The touch panel of claim 8, wherein the touch lead extends in a row direction;

one of the row detection circuit and the column detection circuit is disposed in the first non-display area, and the other detection circuit is disposed in the second non-display area.

12. A driving method of a touch panel, which is applied to the touch panel of any one of claims 1 to 11, the driving method comprising:

in a first mode, each frame of image is subjected to self-capacitance detection of touch control through at least one of a row detection circuit or a column detection circuit;

13. The driving method of the touch panel according to claim 12, wherein the row detection circuit includes a plurality of row control switch transistors; the column detection circuit comprises a plurality of column control switch tubes; the row control switch tubes and the touch electrodes are arranged in a one-to-one correspondence manner; the column control switch tubes and the touch electrodes are arranged in a one-to-one correspondence manner;

14. The driving method of a touch panel according to claim 13,

in a first mode, each frame of image is subjected to self-capacitance detection of touch by one of a row detection circuit or a column detection circuit, and the method comprises the following steps:

in a first mode, conducting row control switch tubes corresponding to the touch control electrodes line by line through a plurality of row control signals in each frame of image; when the row control switch tube is conducted, the plurality of row input and output ends are connected with the driving waveform and read the detection signal; alternatively, the first and second electrodes may be,

in a first mode, each frame of image is conducted with the column control switch tubes corresponding to the touch control electrodes column by column through a plurality of column control signals; when the column control switch tubes are conducted, the plurality of column input and output ends are connected with the driving waveforms and read the detection signals.

15. The driving method of the touch panel according to claim 13, wherein the number of rows of the touch electrodes arranged in the array is plural; the number of the rows of the touch electrodes arranged in the array is multiple;

in a second mode, each frame of image is detected by a column detection circuit and a row detection circuit to obtain coordinates of a touch point along a row direction and coordinates of the touch point along a column direction, including:

in the column detection stage, the column control switch tubes corresponding to the touch control electrodes are conducted column by column through a plurality of column control signals; when the column control switch tubes are conducted, the plurality of column input and output ends are connected in parallel to output detection signals so as to obtain coordinates of the touch points along the row direction;

in the line detection stage, line control switch tubes corresponding to the touch control electrodes are conducted line by line through a plurality of line control signals; when the row control switch tube is conducted, the plurality of row input and output ends are connected in parallel to output detection signals so as to obtain the coordinates of the touch points along the column direction.

16. The driving method of a touch panel according to claim 13,

in the column detection stage, column control switch tubes corresponding to the multiple columns of touch control electrodes are conducted simultaneously through multiple column control signals; when the column control switch tubes are conducted, the plurality of column input and output ends respectively output detection signals to obtain the coordinates of the active pen along the column direction;

in the row detection stage, row control switch tubes corresponding to the multiple rows of touch control electrodes are simultaneously conducted through multiple row control signals; when the row control switch tube is conducted, the plurality of row input and output ends respectively output detection signals to obtain the coordinates of the active pen along the row direction.

17. The driving method of the touch panel according to claim 13, wherein the row detection circuit further comprises: a plurality of row auxiliary switching tubes; the row auxiliary switch tubes and the touch electrodes are arranged in a one-to-one correspondence manner; the second ends of the column control switch tubes are electrically connected with the input and output ends of the corresponding columns through the corresponding row auxiliary switch tubes; the control ends of the row auxiliary switch tubes corresponding to the plurality of touch electrodes in the same row are connected with the same row auxiliary signal end;

the column detection circuit further includes: a plurality of column auxiliary switching tubes; the column control switch tubes and the touch electrodes are arranged in a one-to-one correspondence manner; the second ends of the row control switch tubes are electrically connected with the corresponding row input and output ends through the corresponding column auxiliary switch tubes; and the control ends of the column auxiliary switch tubes corresponding to the plurality of touch electrodes in the same column are connected with the same column auxiliary signal end.

18. The driving method of a touch panel according to claim 17,

when the line detection circuit detects, each frame of image conducts the line control switch tubes corresponding to the touch control electrodes line by line through a plurality of line control signals; if the row control switch tube corresponding to the touch electrode is in a conducting state, the row auxiliary switch tube corresponding to the touch electrode is in a disconnecting state; if the row auxiliary switch tube corresponding to the touch electrode is in a conducting state, the row control switch tube corresponding to the touch electrode is in a switching-off state; the column control switch tube and the column auxiliary switch tube are all conducted; when the row control switch tube is conducted, a plurality of row input and output ends are connected with a driving waveform and read a detection signal, and a plurality of column input and output ends are connected with the driving waveform; alternatively, the first and second electrodes may be,

when the column detection circuit detects, each frame of image conducts the column control switch tubes corresponding to the touch control electrodes column by column through a plurality of column control signals; if the row control switch tube corresponding to the touch electrode is in a conducting state, the row auxiliary switch tube corresponding to the touch electrode is in a switching-off state; if the row of auxiliary switch tubes corresponding to the touch electrode is in a conducting state, the row of control switch tubes corresponding to the touch electrode is in a switching-off state; the row control switch tube and the row auxiliary switch tube are all conducted; when the column control switch tube is conducted, the plurality of column input and output ends are connected with the driving waveform and read the detection signal, and the plurality of row input and output ends are connected with the driving waveform.

19. The driving method of a touch panel according to claim 17,

in the column detection stage, column control switch tubes corresponding to the multiple columns of touch control electrodes are conducted simultaneously through multiple column control signals; simultaneously turning off the column auxiliary switch tubes corresponding to the multiple columns of touch electrodes through the multiple column auxiliary signals; the row control switch tubes corresponding to the multiple rows of touch control electrodes are turned off simultaneously through multiple row control signals; simultaneously conducting row auxiliary switch tubes corresponding to the multiple rows of touch electrodes through multiple row auxiliary signals; when the column control switch tubes are conducted, the plurality of column input and output ends respectively output detection signals to obtain coordinates of the touch points along the column direction;

in the row detection stage, the column control switch tubes corresponding to the multiple columns of touch control electrodes are simultaneously turned off through multiple column control signals; simultaneously conducting the column auxiliary switch tubes corresponding to the multiple columns of touch electrodes through the multiple column auxiliary signals; row control switch tubes corresponding to the multiple rows of touch control electrodes are conducted simultaneously through the multiple row control signals; simultaneously turning off row auxiliary switch tubes corresponding to the multiple rows of touch electrodes through multiple row auxiliary signals; when the row control switch tube is conducted, the plurality of row input and output ends respectively output detection signals to obtain the coordinates of the touch points along the row direction.

20. A display device comprising the touch panel according to any one of claims 1 to 11.