CN114816138B

CN114816138B - Touch panel, driving method thereof and display device

Info

Publication number: CN114816138B
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: 2024-07-09
Anticipated expiration: 2042-03-31
Also published as: CN114816138A

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 a row direction and a column direction respectively; the multiplexing circuit is respectively and electrically connected with the control end and the touch electrode; the touch 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, the switching of different touch detection modes can be realized through the row detection circuit and the column detection 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 present invention relates to the field of display technologies, and in particular, to a touch panel, a driving method thereof, and a display device.

Background

An Active-matrix organic light-emitting diode (AMOLED) on-cell (Y-OCTA or TPOT) touch screen 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 typically either mutual or self-capacitive. Specifically, for the self-capacitance scheme, since each node electrode has independent leads for independent addressing, the number of leads is increased to X2, where X2 is the number of rows of electrodes along the X direction, and Y2 is the number of columns of electrodes along the Y direction, so that each node electrode cannot be connected to an independent touch IC pin, and it is generally required to use multiplexing circuits in the panel to make node electrodes in different areas perform time-sharing detection, so that the number of output leads is shortened.

However, the multiplexing circuit determines the scanning sequence when the self-capacitance electrode is partitioned, is not flexibly adjustable, and cannot be suitable for 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 to 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 a row direction and a column direction respectively;

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

The touch 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 of 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 touch self-capacitance detection 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 acquire coordinates of the touch point along the row direction and 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 control signals is connected with the corresponding touch electrodes through a multiplexer so as to drive the touch electrodes. 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, 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 set of multiplexers, the problem that the scanning time sequence of the existing multiplexer is fixed and only self-capacitance detection can be realized is effectively solved.

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 another enlarged configuration of the multiplexer of FIG. 2;

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

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

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

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

fig. 9 is a schematic flow chart of a driving method of a touch panel according to an embodiment of the invention;

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

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

FIG. 12 is a driving timing chart of a second mode according to an embodiment of the present invention;

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

FIG. 14 is a driving timing chart of another first mode according to the embodiment of the present invention;

FIG. 15 is a driving timing chart of a second 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 invention is described in further detail below 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 thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

For the self-capacitance scheme, because of independent addressing, each node electrode has independent leads, in order to avoid the lead number from increasing to X2X Y2, where X2 is the number of rows of the electrodes along the X direction, and Y2 is the number of columns of the electrodes along the Y direction, it is necessary to pass through multiplexing circuits in the panel, so that the node electrodes in different areas are detected in a time-sharing manner, and the output lead number is shortened. However, the multiplexing circuit determines the sequence of the self-capacitance electrode partition time-sharing scanning, and can not be flexibly adjusted, and compared with the active pen touch detection, the multiplexing circuit belongs to different methods, and is not applicable to one set of multiplexing circuit. As shown in fig. 1, fig. 1 is a schematic structural diagram of a multiplexing circuit in the prior art, where the multiplexer includes a common driving tube T1' corresponding to the touch electrode P1' one by one and a column switching tube T2' corresponding to the touch electrode P1' one by one, and the column switching tube T2' corresponding to the touch electrode P1' can be driven column by column through a column switching control line, for example, SW4' to SW6', and a driving signal is input row by row through an input output line, for example, SX1' to SX3', so that the driving signal is transmitted to the corresponding touch electrode P1' through the column switching tube T2', and can be specifically positioned to the determined touch electrode P1' through the column switching control line and the input output line. When the front touch electrode P1 'is driven and detected, the rest of touch electrodes P1' are connected to the common driving line COM 'through the common driving tube T1', the common driving tube T1 'can be controlled through the common driving switch line, for example, SW1' 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, and the touch detection of the active pen needs to respectively detect the row coordinates and the column coordinates of the touch point.

In order to solve the problem that the multiplexer cannot be compatible with touch detection of the active pen, the embodiment of the invention provides a touch panel, which comprises:

touch electrodes arranged in an array along a row direction and a 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 be switched to detect.

In the embodiment of the invention, the touch panel comprises the 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, the row detection circuit and the column detection circuit can be switched to detect, 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 set of multiplexers, the problem that the scanning time sequence of the existing multiplexer is fixed and only self-capacitance detection can be realized is effectively solved.

The foregoing is the core idea of the present invention, and the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making any inventive effort are intended to fall within the 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 schematic structural diagram of the multiplexer in fig. 2, referring to fig. 2 and fig. 3, the touch panel includes: touch electrodes P arranged in an array along a row direction X and a column direction Y respectively, wherein the row direction X and the column direction Y intersect, and optionally, the row direction X and the column direction Y can be vertically arranged. The number of rows and columns of the touch electrodes P can be set according to the required touch accuracy, and this embodiment is not limited in particular, and in fig. 2, a touch electrode array of 5 rows and 4 columns is illustrated as an example, but the present embodiment is not limited. The touch panel further includes a multiplexing circuit 11, one end of the multiplexing circuit 11 is connected to a corresponding touch electrode P through a touch trace 13, and the other end of the multiplexing circuit 11 is connected to a corresponding control end 12 (pad terminal), so that a driving signal received by the control end 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 be transmitted to the control end 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 between the row detection circuit 111 and the column detection circuit 112 can realize different multiplexing circuits 11, so as to 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 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, 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 touch self-capacitance detection; in the second mode, the column detection circuit 112 and the row detection circuit 111 perform detection to acquire coordinates in the row direction X and 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 driving signal (driving waveform) is set in one-to-one correspondence with the touch electrode P, each touch electrode P can be independently detected, 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 for touch self-capacitance detection, or the row detection circuit 111 and the column detection circuit 112 may sequentially perform touch self-capacitance detection, so as to enhance accuracy of self-capacitance touch detection and improve touch detection accuracy. In the second mode, the column detection circuit 112 and the row detection circuit 111 are connected to the circuits at the same time, and sequentially acquire the coordinates of the row direction X and the coordinates of the column direction Y for a certain touch point, so that only one touch point can be realized in the second mode. In a certain example, the first mode may be a user finger touch detection mode, the second mode may be an active pen touch detection mode, and the single touch may satisfy a touch detection process of the active pen. Of course, the present embodiment is not limited to the above example, and in other examples, the first mode is a finger tip touch detection mode, the second mode is another pressure touch detection mode, and specific forms of the first mode and the second mode are not limited.

With continued reference to fig. 3, optionally, the control end may at least include: a row control signal end row_sw, a row input/output end row_sx, a column control signal end cow_sw and a column input/output end cow_sx; the row detection circuit 111 includes a plurality of row control switching transistors T1; the column detection circuit 112 includes a plurality of column control switching transistors 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 with the corresponding touch electrode P through a touch wiring 13; the control end of the row control switch tube T1 corresponding to the plurality of touch control electrodes P in the same row is connected with the same row control signal end row_sw; the second ends of the row control switch tubes T1 corresponding to the touch electrodes P in the same row are connected with the same row input/output end row_sx; the first end of the column control switch tube T2 is electrically connected with the corresponding touch electrode P through a touch wiring 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 cow_sw; the second ends of the row control switch tubes T1 corresponding to the touch electrodes P in the same row are connected with the same column input/output end cow_sx.

In this embodiment, the touch electrodes P are connected to the multiplexer 11 through the touch traces 13 in a one-to-one correspondence, and the touch electrodes P can obtain unique driving waveforms through the corresponding touch traces 13. In fig. 3, a touch electrode array of 3 rows and 3 columns is illustrated, 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 switching transistors T1 may be included, where the row control switching transistors T1 are disposed in a one-to-one correspondence with the touch electrodes P, and a 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, wherein the control ends of the row control switch tubes T1 corresponding to the plurality of touch electrodes P in the same row are connected to the same row control signal end row_sw, for example, the row control switch tubes T1 corresponding to the touch electrodes P11, P12 and P13 in the same row are connected to the same row control signal end row_sw_1, the row control switch tubes T1 corresponding to the touch electrodes P14, P15 and P16 in the same row are connected to the same row control signal end row_sw_2, and the row control switch tubes T1 corresponding to the touch electrodes P17, P18 and P19 in the same row are 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 row are connected with the same row input/output end row_sx, and the row control switch tubes T1 corresponding to the touch electrodes P in different rows in the same row are connected with different row input/output ends row_sx. For example, the row control switch transistors 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 transistors 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 transistors 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, where the column control switch transistors T2 are disposed in a one-to-one correspondence with the touch electrodes P, and a 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 tube T2 is disposed between the column input/output end 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 end of the column control switch tube T2 corresponding to the plurality of touch electrodes P in the same column is connected to the same column input/output end cow_sx, for example, the row control switch tube T1 corresponding to the touch electrodes P11, P14 and P17 in the same column is connected to the same column control signal end cow_sw_1, the row control switch tube T1 corresponding to the touch electrodes P12, P15 and P18 in the same column is connected to the same column control signal end cow_sw_2, and the row control switch tube T1 corresponding to the touch electrodes P13, P16 and P19 in the same column is connected to the same column control signal end cow_sw_2. Column control switch tubes T2 corresponding to a plurality of touch electrodes P in the same column are connected with the same column input/output end cow_sx, and row control switch tubes T1 corresponding to touch electrodes P in different columns are connected with different column input/output ends cow_sx. For example, the row control switch tubes T1 corresponding to the touch electrodes P11, P12, and P13 in the same row are connected to the same column input/output terminal cow_sx_3, the row control switch tubes T1 corresponding to the touch electrodes P14, P15, and P16 in the same row are connected to the same column input/output terminal cow_sx_2, and the row control switch tubes T1 corresponding to the touch electrodes P17, P18, and P19 in the same row are connected to the same column input/output terminal cow_sx_1.

On the basis of the multiplexer shown in fig. 3, if the self-capacitive touch detection in the first mode is performed, only one of the row detection circuit 111 and the column detection circuit 112 is controlled to perform the detection, and if only the row detection circuit 111 is controlled to perform the self-capacitive touch detection, the column control switch tube T2 is turned off through 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. And the touch electrodes P are driven row by row through the row control signal end row_sw, when the touch electrodes P of the current row are driven, other row touch electrodes P are not driven, and in one row of touch electrodes P, each touch electrode P is connected with different row input/output ends row_sx, so that self-capacitance detection can be independently carried out on each touch electrode P according to the row control signal end row_sw and the row input/output ends row_sx. If only the column detection circuit 112 is controlled to perform self-capacitance touch detection, the row control switch T1 is turned off by the row control signal end row_sw, so that the connection between the row input/output end row_sx and the touch electrode P is effectively prevented, that is, the row detection circuit 111 is turned off. And the touch electrodes P are driven column by column through the column control signal terminal cow_sw, when the touch electrodes P in the previous column are driven, the touch electrodes P in other columns are not driven, and in one column of touch electrodes P, each touch electrode P is connected with a different column input/output terminal cow_sx, and similarly, the self-capacitance detection can be independently performed on each touch electrode P according to the column control signal terminal cow_sw and the column input/output terminal cow_sx. If the row detection circuit 111 and the column detection circuit 112 perform self-capacitance detection once, self-capacitance detection can be performed twice for each frame of image, thereby improving self-capacitance detection accuracy.

On the basis of the multiplexer shown in fig. 3, if 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 detect in sequence. Specifically, the column detection process may be completed by connecting the column input/output terminals cow_sx of the column detection circuit 112 in parallel and driving the touch electrodes P column by column, so as to obtain the coordinates of the touch points along the row direction X. In addition, the row detection process may be completed by connecting the input/output terminals row_sx of each row of the row detection circuit 111 in parallel and driving the touch electrodes P row by row, so as to obtain the coordinates of the touch points along the column direction Y.

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

In summary, the multiplexing circuit 11 in this embodiment has a simple structure, and the row detection circuit 111 and the column detection circuit 112 can switch to realize self-capacitance touch detection, or operate simultaneously to detect row and column coordinates of touch points. The touch panel can be compatible with the working modes of the first mode and the second mode at the same time, the working modes can be flexibly adjusted according to the requirements of users, and the adaptability of the touch panel is improved, for example, the self-capacitance touch panel can be suitable for 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: row_sw_b and column_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 in one-to-one correspondence with the touch electrodes P; the second end of the column control switch tube T2 is electrically connected with the corresponding column input/output end cow_sx through the corresponding row auxiliary switch tube T4; the control end of a row auxiliary switch tube T4 corresponding to the plurality of touch control electrodes P in the same row is 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 row auxiliary switch tube T3; the control ends of the row auxiliary switch tubes T3 corresponding to the touch electrodes P in the same row are connected with the same row auxiliary signal end cow_sw_B.

Compared to the multiplexer shown in fig. 3, the row detection circuit 111 of the multiplexer in this embodiment has a row auxiliary switch tube T4, where the row auxiliary switch tube T4 is disposed in one-to-one correspondence with the touch electrodes P, and is used for connecting the column control switch tube T2 and the corresponding column input/output terminal cow_sx, the control terminals of the row auxiliary switch tube T4 corresponding to the plurality of touch electrodes P in the same row are connected to the same row auxiliary signal terminal row_sw_b, and the control terminals of the row auxiliary switch tube T4 corresponding to the plurality of touch electrodes P in different rows are connected to different row auxiliary signal terminals row_sw_b. For example, the row auxiliary switch tube T4 corresponding to the touch electrodes P11, P12 and P13 in the same row is connected to the same row auxiliary signal end row_sw_3b, the row auxiliary switch tube T4 corresponding to the touch electrodes P14, P15 and P16 in the same row is connected to the same row auxiliary signal end row_sw_2b, and the row auxiliary switch tube T4 corresponding to the touch electrodes P17, P18 and P19 in the same row is connected to the same row auxiliary signal end row_sw_1b. The row auxiliary switch tube T4 can prevent the row input/output terminal cow_sx from inputting the driving waveform to a touch electrode P when the row input/output terminal row_sx inputs the driving waveform to the touch electrode P, thereby avoiding the touch detection error. In the first mode, when the current touch electrode P is driven by the row input/output terminal row_sx, the row auxiliary switching tube T4 corresponding to the other touch electrodes P may be turned on, so that the column input/output terminal row_sx outputs an auxiliary signal identical to the driving waveform, thereby avoiding forming a capacitance between the current touch electrode P and the other touch electrodes and affecting the accuracy of self-capacitance detection. It should be noted that in the second mode, all the auxiliary signal terminals do not work, for example, the potential can be switched to zero, because the driving signal of the active pen mode is emitted by the active capacitive pen itself, and the touch panel only performs the signal receiving function.

Compared to the multiplexer shown in fig. 3, the column detection circuit 112 of the multiplexer in this embodiment has additional column auxiliary switch tubes T3, where the column auxiliary switch tubes T3 are disposed in one-to-one correspondence with the touch electrodes P, and are used for connecting the row control switch tubes T1 with the corresponding row input/output ends row_sx, the control ends 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 end cow_sw_b, and the control ends of the column auxiliary switch tubes T3 corresponding to the touch electrodes P in different columns are connected to different column auxiliary signal ends cow_sw_b. For example, the column auxiliary switch tubes T3 corresponding to the touch electrodes P11, P14 and P17 in the same column are connected to the same column auxiliary signal terminal cow_sw_3b, the column auxiliary switch tubes 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 tubes 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 terminal row_sx from inputting the driving waveform to a certain touch electrode P when the column input/output terminal row_sx inputs the driving waveform to the touch electrode P, thereby avoiding the touch detection error. In the first mode, when the current touch electrode P is driven by the row input/output terminal cow_sx, the row auxiliary switching tube T3 corresponding to the other touch electrodes P may be turned on, so that the row input/output terminal row_sx outputs an auxiliary signal with the same driving waveform, thereby avoiding forming a capacitance between the current touch electrode P and the other touch electrodes and affecting the accuracy of self-capacitance detection.

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

The row auxiliary switch T4 may prevent the column input/output terminal cow_sx from inputting the driving waveform to the touch electrode P when the row input/output terminal cow_sx inputs the driving waveform to the touch electrode P, and similarly, the row auxiliary switch T3 may prevent the row input/output terminal row_sx from inputting the driving waveform to the touch electrode P when the column input/output terminal cow_sx inputs the driving waveform to the touch electrode P. For example, for the multiplexer shown in fig. 3, if the touch electrode P11 obtains the driving signal through the row control signal terminal row_sw_1, and if the column input/output terminal row_sx_inputs the auxiliary signal to the touch electrode P11, signal crosstalk easily occurs in the touch electrode P11, and in this embodiment, the crosstalk is effectively avoided through the row auxiliary switching tube T4 and the column auxiliary switching tube T3.

When the column detection circuit 112 detects, the switch 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 in a time sharing manner; when the row detection circuit 111 detects, the switch pairs controlled by the row_sw_1 and row_sw_1b, row_sw_2 and row_sw_2b, row_sw_3 and row_sw_3b are switch pairs with opposite switch states, and the touch electrode columns C21/C24/C27, C20/C23/C26 and C19/C22/C25 can be controlled to output detection signals through row_sx1/2/3 in a time sharing manner, so that the row auxiliary signal terminals cow_sw_b and row auxiliary signal terminals cow_sw can effectively prevent the touch electrodes from generating signal crosstalk, and inaccuracy of the detection signals can be effectively avoided.

Fig. 6 is a schematic cross-sectional structure of the touch panel in fig. 2 along the column direction Y, and referring to fig. 2 and 6, optionally, the touch panel may further include: a substrate 21; a pixel driving circuit layer 22 provided on one side of the substrate 21; the pixel driving circuit layer 22 includes a plurality of pixel driving circuits; the multiplexing circuit is provided 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-pixels 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 encapsulation 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 for implementing 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 far 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 used for driving the sub-pixels 25 to emit light, and the 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 with the multiplexing circuit 11 of the pixel driving circuit layer 22 in the non-display area NA which does not cover the encapsulation layer 23, so that the touch lead 13 does not pass through the encapsulation layer 23 to be electrically connected with the multiplexing circuit 11, but bypasses the encapsulation layer 23 to be electrically connected with 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, so as 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 on opposite sides of the display area AA in the row direction X; and third and fourth non-display areas NA3 and NA4 located at opposite sides of the display area AA in the column direction Y; the binding area 14 is located in the fourth non-display area NA4; the binding area 14 is used for binding a flexible circuit board or a 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: a first non-display area NA1 and a second non-display area NA2 located on 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 on 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 end 12 is disposed in the lower frame area, the area where the control end 12 is disposed is the binding area 14 in this embodiment, the binding area 14 may be a packaging structure of a Chip On Film (COF), that is, the flexible circuit board is bound to the control end 12 of the binding area 14, the touch Chip may be disposed On the flexible circuit board and bent to a side of the touch panel near the substrate 21 along with the flexible circuit board, and the touch Chip transmits a driving signal to the control end 12 through the flexible circuit board. Alternatively, the bonding area 14 may be a package structure in which the chip is directly bonded to a glass (COG), that is, the touch chip is directly bonded to the control end 12 of the bonding area 14. The present embodiment is not particularly limited in terms of the setting of the binding area 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, and occupies the lower frame space.

Fig. 7 is a schematic structural diagram of another touch panel according to an embodiment of the present invention, and optionally, the touch leads 13 extend along the column direction Y; one of the row detection circuit 111 and the column detection circuit 112 is disposed in the third non-display area NA3, and the other is disposed in the fourth non-display area NA4. In order to further reduce the occupied space of 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 detection circuit disposed in the third non-display area NA3 is connected to the control terminal 12 of the binding area 14 through control leads disposed in the first non-display area NA1 and the second non-display area NA 2. The penetrating touch lead 13 is respectively connected with the detection circuit of the third non-display area NA3 and the detection circuit of the fourth non-display area NA4, the touch lead 13 is connected to the detection circuit at the position where the third non-display area NA3 has no packaging layer 23, and the control end 12 is connected to the detection circuit of the third non-display area NA3 through the control lead 113 arranged 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, and optionally, the touch lead 13 extends along the row direction X; one of the row detection circuit 111 and the column detection circuit 112 is disposed in the first non-display area NA1, and the other is disposed in the second non-display area NA2. 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, so that the multiplexing circuit is not disposed in the lower frame area (the fourth non-display area NA 4), thereby further reducing the width of the lower frame and reasonably utilizing the space of the left and right frames of the touch panel. The penetrating touch lead 13 is connected with the detection circuit of the first non-display area NA1 and the detection circuit of the second non-display area NA2 respectively, the penetrating touch lead 13 is connected with the detection circuit at the position without the packaging layer 23 in the lower frame area, and the control end 12 is connected with the detection circuits of the first non-display area NA1 and the second non-display area NA2 through the control lead 113 arranged in the lower frame area.

Based on the same conception, 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 schematic flow chart of a driving method of a touch panel according to an embodiment of the present invention, as shown in fig. 9, the method of the embodiment includes the following steps:

In step S110, in the first mode, each frame of image is detected by at least one of the row detection circuit and the column detection circuit.

In 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 along the column direction.

In the embodiment of the invention, the touch panel comprises the 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, the row detection circuit and the column detection circuit can be switched to detect, so that the switching of different touch modes is realized, specifically, in a first mode, the self-capacitance detection of touch is carried out only through at least one of the row detection circuit and the column detection circuit, in a second mode, the column detection circuit and the row detection circuit are simultaneously switched into the circuit to acquire the coordinates of a touch point along the row direction and the coordinates along the column direction, 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 problem that the existing multiplexer is fixed in scanning time sequence and only the self-capacitance detection can be realized is effectively solved.

With continued reference to fig. 3, optionally, 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 transistors 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 with the corresponding touch electrode P through a touch wiring 13; the control end of the row control switch tube T1 corresponding to the plurality of touch control electrodes P in the same row is connected with the same row control signal end row_sw; the second ends of the row control switch tubes T1 corresponding to the touch electrodes P in the same row are connected with the same row input/output end row_sx; the first end of the column control switch tube T2 is electrically connected with the corresponding touch electrode P through a touch wiring 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 cow_sw; the second ends of the row control switch tubes T1 corresponding to the touch electrodes P in the same row are connected with the same column input/output end cow_sx.

Optionally, in the first mode, each frame of image is detected by self-capacitance through touch control by one of a row detection circuit or a column detection circuit, including: in a first mode, each frame of image is conducted with a row control switch tube corresponding to the touch electrode row by row through a plurality of row control signals; when the row control switch tube is turned on, the plurality of row input/output ports are connected with driving waveforms and read detection signals; or in the first mode, each frame of image is connected with a column control switch tube corresponding to the touch electrode column by column through a plurality of column control signals; when the column control switch tube is turned on, the plurality of column input/output ports access the driving waveform and read the detection signal.

Fig. 10 is a driving timing chart of a first mode provided by an embodiment of the present invention, fig. 11 is a driving timing chart of another first mode provided by an embodiment of the present invention, fig. 10 is a specific timing chart of self-capacitance detection performed by the row detection circuit 111, referring to fig. 3 and fig. 10, in the first mode, for the multiplexer shown in fig. 3, each frame of image sequentially controls the row control signals row_sw_1, row_sw_2 and row_sw_3, so that the row control switch tube T1 corresponding to the touch electrode P is turned on row by row, and when the row control switch tube T1 corresponding to a certain row of touch electrode P is turned on, the row input/output ends row_sx_1, row_sx_2 and row_sx_3 are connected to the driving waveforms and read the detection signals, and then each touch electrode P receives the driving waveforms corresponding to each other row input/output end in the row touch electrode P, so as to implement self-capacitance detection. The drive waveform may be a square wave or sine wave between 50kHz and 500kHz, with a voltage between 0.1V and 40V, for example. Note that in the timing chart of this embodiment, the stage of turning ON the switching tube is labeled ON, and the stage of inputting the driving waveform or the detection signal to the input/output terminal is labeled sensing.

Fig. 11 is a specific timing sequence of the self-capacitance detection performed by the column detection circuit 112, referring to fig. 3 and 10, for the multiplexer shown in fig. 3, in the first mode, each frame of image sequentially controls the column control signals cow_sw_1, cow_sw_2 and cow_sw_3, so that the column control switch tube T2 corresponding to the touch electrode P is turned on column by column, and when the column control switch tube T2 corresponding to a certain column of touch electrode P is turned on, the plurality of column input/output terminals cow_sx_1, cow_sx_2 and cow_sx_3 access the driving waveforms and read the detection signals, and each touch electrode P in the column of touch electrodes P corresponds to a different column input/output terminal, so that each touch electrode P receives a one-to-one driving waveform to implement the self-capacitance detection.

In general, the present embodiment may select one of the row detection circuit 111 and the column detection circuit 112 to perform self-capacitance touch detection. The line detection circuit 111 and the column detection circuit may detect each image frame once. Alternatively, when one of the row detection circuit 111 and the column detection circuit 112 is selected to perform self-capacitance touch detection, the self-capacitance detection can be performed on one frame of image through the row detection circuit 111, the self-capacitance detection can be performed on the next frame of image through the column detection circuit 112, and then the self-capacitance detection can be performed on one frame of image through the row detection circuit 111, so that the optimal noise averaging effect can be obtained, and the accuracy of the self-capacitance touch detection can be improved.

Optionally, the number of rows of touch electrodes arranged in an array is multiple; the number of columns of touch electrodes arranged in an array is multiple; in the 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 along a column direction, including: in the column detection stage, column control switching tubes corresponding to the touch electrodes are conducted column by column through a plurality of column control signals; when the column control switch tube is turned on, a plurality of column input/output ends are connected in parallel to output detection signals so as to acquire coordinates of the touch point along the row direction; in the row detection stage, a row control switching tube corresponding to the touch electrode is conducted row by row through a plurality of row control signals; when the row control switch tube is turned on, the plurality of row input/output ends are connected in parallel to output detection signals so as to obtain coordinates of the touch point along the column direction.

Fig. 12 is a driving timing chart of a second mode provided by the embodiment of the present invention, and with continued reference to fig. 3 and 12, in the second mode, in a column detection stage, column control switch tubes T2 corresponding to the touch electrodes are sequentially controlled to be turned on column by column, when a certain column control switch tube T2 is turned on, detection signals are output in parallel by column input/output ends cow_sx_1, cow_sx_2 and cow_sx_3, and if a detection signal appears at the column input/output ends when the column control switch tube T2 is turned on, a touch point is determined to be located at the column touch electrode, so that coordinates 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, the row control switch tube T1 corresponding to the touch electrode is turned on row by row, when a certain row control switch tube T1 is turned on, the row input/output ends row_sx_1, row_sx_2 and row_sx_3 are connected in parallel to output detection signals, if the detection signals appear at the row input/output ends when the row control switch tube T1 is turned on, the touch point is determined to be located at the row touch electrode, and therefore 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 input and output ends cow_sx of adjacent columns are electrically connected through the column parallel switch tube T6, so that in the second mode, the row parallel switch tube T5 and the column parallel switch tube T6 are required to be controlled to be fully conducted through the second mode switch control end sw_pen, the parallel connection of the row input and output ends is realized, and the parallel connection of the column input and output ends is realized.

It should be noted that, in the implementation of the present invention, the driving waveforms input to the touch electrode by the routine input/output terminal and the column input/output terminal are high level, and the control terminal of the switching tube is turned on at low level, which is only one implementation, in other implementations, the driving waveforms input to the touch electrode by the row input/output terminal and the column input/output terminal may be low level, and the control terminal of the switching tube may be turned on at high level. This embodiment includes, but is not limited to, the implementation in this embodiment.

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 along the column direction, which may include: in the column detection stage, column control switching tubes corresponding to the touch electrodes of a plurality of columns are simultaneously conducted through a plurality of column control signals; when the column control switch tube is turned on, the plurality of column input and output ends respectively output detection signals to acquire coordinates of the active pen along the column direction; in the row detection stage, row control switching tubes corresponding to the plurality of rows of touch electrodes are simultaneously conducted through a plurality of row control signals; when the row control switch tube is turned on, the plurality of row input and output ends respectively output detection signals to acquire coordinates of the active pen along the row direction.

In addition, the output of the detection signal may be realized in other manners 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 chart of another second mode provided by the embodiment of the present invention, and with continued reference to fig. 3 and 13, in the second mode, in a column detection stage, column control signals cow_sw_1, cow_sw_2 and cow_sw_3 are controlled, and simultaneously column control switch tubes T2 corresponding to each column of touch electrodes are turned on, when a certain column control switch tube T2 is turned on, column input/output terminals cow_sx_1, cow_sx_2 and cow_sx_3 output detection signals respectively, and if the column input/output terminals cow_sx_1 output detection signals, it is determined that touch points are located in rows of touch electrodes P17, P18 and P19, so that coordinates of the touch points along a 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, and the row control switch transistors T1 corresponding to the row touch electrodes are turned on at the same time, when a certain row control switch transistor 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 detection signals, it is determined that the touch points are located in the columns where the touch electrodes P17, P18 and P19 are located, so that the coordinates of the touch points along the row direction X can be determined. According to the embodiment, through time sequence change, the row parallel switch tube T5 and the column parallel switch tube T6 are not required to be arranged, so that a multiplexing circuit can be effectively simplified, and the cost of a panel 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 in one-to-one correspondence with the touch electrodes P; the second end of the column control switch tube T2 is electrically connected with the corresponding column input/output end cow_sx through the corresponding row auxiliary switch tube T4; the control end of a row auxiliary switch tube T4 corresponding to the plurality of touch control electrodes P in the same row is 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 row auxiliary switch tube T3; the control ends of the row auxiliary switch tubes T3 corresponding to the touch electrodes P in the same row are connected with the same row auxiliary signal end cow_sw_B.

Optionally, in the first mode, each frame of image is detected by self-capacitance through touch control by one of a row detection circuit or a column detection circuit, including: when the line detection circuit detects, each frame of image is conducted with a line control switch tube corresponding to the touch electrode line by line through a plurality of line control signals; if the row control switch tube corresponding to the touch electrode is in an on state, the row auxiliary switch tube corresponding to the touch electrode is in an off state; if the row auxiliary switch tube corresponding to the touch electrode is in an on state, the row control switch tube corresponding to the touch electrode is in an off state; the column control switch tube and the column auxiliary switch tube are all conducted; when the row control switch tube is turned on, the plurality of row input/output ports are connected with the driving waveform and read the detection signal, and the plurality of column input/output ports are connected with the driving waveform; or when the column detection circuit detects, each frame of image is connected with a column control switch tube corresponding to the touch electrode column by column through a plurality of column control signals; if the column control switch tube corresponding to the touch electrode is in an on state, the column auxiliary switch tube corresponding to the touch electrode is in an off state; if the row auxiliary switch tube corresponding to the touch electrode is in an on state, the row control switch tube corresponding to the touch electrode is in an off state; the row control switching tube and the row auxiliary switching tube are all conducted; when the column control switch tube is turned on, the plurality of column input/output ports access to the driving waveform and read the detection signal, and the plurality of row input/output ports access to the driving waveform.

Fig. 14 is a driving timing chart of another first mode provided by the embodiment of the present invention, referring to fig. 4 and 10, for the multiplexer shown in fig. 4, a row auxiliary switch tube T4 and a column auxiliary switch tube T3 are added, so that in the first mode, when the front 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 can be turned on, so that the row input/output terminal row_sx outputs an auxiliary signal identical to the driving waveform to the other touch electrode P, thereby avoiding forming a capacitance between the front touch electrode P and the other touch electrodes, and affecting the accuracy of self-capacitance detection. Alternatively, the auxiliary signal is the same as the driving waveform, but is only used as auxiliary driving, and the output signal of the row input/output terminal row_sx is not read. Only the detection signal output from the column input/output terminal cow_sx is read. Similarly, when the front touch electrode P is driven by the row input/output terminal row_sx, the other touch electrodes P can acquire the auxiliary signal from the column input/output terminal row_sx.

Specifically, in the first mode, when the row detection circuit 111 detects, the row control signals row_sw_1, row_sw_2 and row_sw_3 are controlled for each frame, so that the row control switch tube T1 corresponding to the touch electrode P is turned on row by row, and when the row control switch tube T1 corresponding to a certain row of touch electrode P is turned on, for example, the row control switch tube T1 corresponding to the row control signal row_sw_1 is turned on, the corresponding row auxiliary switch tube T4 is controlled to be turned off, that is, the row auxiliary signal end row_sw_1b controls the row auxiliary switch tube T4 to be turned off, and the connection between the column input/output end cow_sx and the row touch electrode P is disconnected, so that the driving waveform of the column input/output end cow_sx is avoided being received while the driving waveform of the row input/output end row_sx is received by the touch electrode P. The column auxiliary switch tube T3 is turned on completely, so that each touch electrode P in the row of touch electrodes P receives a driving waveform of a different row of input/output terminals row_sx. At this time, the column control switch transistors T2 are all turned on, and the row auxiliary switch transistors T4 except the row auxiliary signal terminals row_sw_2b and row_sw_2b control the other row touch electrodes P to be turned on, so that the column input/output terminals cow_sx output auxiliary signals (same as the driving waveforms) to the other touch electrodes P, and when the self-capacitance detection is performed on each touch electrode P of the row touch electrodes P, the other row touch electrodes P receive auxiliary waveforms, thereby avoiding generating capacitance between the self-capacitance detection electrodes P and affecting the accuracy of the self-capacitance detection. And then, carrying out self-capacitance detection on the touch electrode P row by row.

With continued reference to fig. 4 and 10, in the first mode, when the column detection circuit 112 detects, the column control signals cow_sw_1, cow_sw_2 and cow_sw_3 are controlled for each frame, so that the column control switch tube T2 corresponding to the touch electrode P is turned on by each column, and when the column control switch tube T2 corresponding to a certain column touch electrode P is turned on, for example, the column control switch tube T2 of a column touch electrode P corresponding to the column control signal cow_sw_1 is turned on, the corresponding column auxiliary switch tube T3 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 terminal row_sx and the column touch electrode P is disconnected, so that the driving waveform of the row input/output terminal row_sx is prevented from being received while the driving waveform of the row input/output terminal row_sx is received at the touch electrode P. The row auxiliary switch tube T4 is turned on completely, so that each touch electrode P of the row of touch electrodes P receives a driving waveform of a different row of input/output terminals cow_sx. At this time, the row control switch transistors T1 are all turned on, and the row auxiliary switch transistors T3 except for the row auxiliary signal terminals cow_sw_2b and row_sw_2b control the other row touch electrodes P to be turned on, so that the row input/output terminal row_sx outputs an auxiliary signal (same as the driving waveform) to the other touch electrodes P, and when the self-capacitance detection is performed on each touch electrode P of the row touch electrodes P, the other row touch electrodes P receive the auxiliary waveform, thereby avoiding generating capacitance between the row touch electrodes P and the self-capacitance detection, and avoiding affecting the accuracy of the self-capacitance detection. And then, carrying out self-capacitance detection on the touch electrode P row by row.

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

Fig. 15 is a driving timing chart of another second mode provided by the embodiment of the present invention, in the second mode, except through the row parallel switch tube T5 and the column parallel switch tube T6, the output of the detection signal can be realized in other manners, and the coordinates of the touch point are indicated, so that the multiplexing circuit is simplified, and the panel cost is reduced.

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 simultaneously turn on the column control switch tubes T2 corresponding to the respective column touch electrodes, the column auxiliary signals cow_sw_ B, cow _sw2b and cow_sw3b simultaneously turn off the column auxiliary switch tubes T3 corresponding to the plurality of column touch electrodes, the row control signals cow_sw_1, cow_sw2 and cow_sw3 simultaneously turn off the row control switch tubes T1, thereby disconnecting the touch electrodes P from the row input/output terminals, the row auxiliary signals cow_sw_1, cow_sw_2 and cow_sw3 simultaneously pass through the auxiliary signals T4, and when the column control switch tubes T2 corresponding to the respective column touch electrodes P are turned on, the row input/output terminals cow_sx_1, cow_sx_2 and cow_s3 respectively turn off the row control switch tubes T1, thereby determining that the touch signal is at the row input/output coordinates of the touch electrodes P and the row input/output coordinates of the touch electrodes P, and the touch points of the touch electrodes P, and the touch input/output coordinates of the touch control signals P, and the touch control signals P can be determined at the row input/output coordinates of the touch control electrodes P and the touch control electrodes P, and the touch control electrode control signals P. Similarly, in the row detection stage, row control signals row_sw_1, row_sw_2 and row_sw_3 control the row control switching transistors T1 corresponding to each row of touch electrodes, row auxiliary signals row_sw_1B, row _sw_2B and row_sw_3B control the row auxiliary switching transistors T4 corresponding to the plurality of rows of touch electrodes, column control signals row_sw_1, row_sw_2 and row_sw_3 control the column control switching transistors T2 corresponding to each column of touch electrodes, thus, the touch electrode P is disconnected from the column input/output terminals, the column auxiliary signals cow_sw_1B, cow _sw_2b and cow_sw_3b simultaneously turn on the column auxiliary switch transistors T3 corresponding to the multiple columns of touch electrodes, the row input/output terminals row_sx_1, row_sx_2 and row_sx_3 respectively output detection signals, and if the row input/output terminal row_sx_1 outputs detection signals, it is determined that the touch point is located in the column where the touch electrodes P17, P18 and P19 are located, so that the coordinates of the touch point along the row direction X can be determined. According to the embodiment, through time sequence change, the row parallel switch tube T5 and the column parallel switch tube T6 are not required to be arranged, so that a multiplexing circuit can be effectively simplified, and the cost of a panel 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 an 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, or an intelligent wearable device, which is not limited in this embodiment.

Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following 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;

The control end at least comprises: a row control signal end, a row input/output end, a column control signal end and a column input/output end;

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

The first end of the row control switch tube is electrically connected with the corresponding touch electrode through a touch wiring; the control ends of the row control switch tubes corresponding to the touch control electrodes in the same row are connected with the same row control signal end; the second ends of the row control switch tubes corresponding to the touch electrodes in the same row are connected with the same row input/output end;

The first end of the column control switch tube is electrically connected with the corresponding touch electrode through the touch wiring; the control ends of the row control switch tubes corresponding to the touch electrodes in the same row are connected with the control signal end of the same row; the 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;

The control end 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 switching tubes are arranged in one-to-one correspondence with the touch electrodes;

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 switching tubes corresponding to the 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 are arranged in one-to-one correspondence with the touch electrodes;

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

2. The touch panel according to claim 1, wherein,

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

3. The touch panel according to claim 1, wherein,

When the row detection circuit detects, if the row control switching tube corresponding to the touch electrode is in an on state, the row auxiliary switching tube corresponding to the touch electrode is in an off state; if the row auxiliary switching tube corresponding to the touch electrode is in an on state, the row control switching tube corresponding to the touch electrode is in an off state;

when the column detection circuit detects, if the column control switching tube corresponding to the touch electrode is in an on state, the column auxiliary switching tube corresponding to the touch electrode is in an off state; if the row auxiliary switch tube corresponding to the touch electrode is in an on state, the row control switch tube corresponding to the touch electrode is in an off state.

4. The touch panel of claim 1, further comprising: a plurality of row parallel switching tubes and column parallel switching tubes;

At least two row input/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 tubes;

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

5. The touch panel of claim 1, further comprising: a substrate;

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

A plurality of sub-pixels disposed on a side of the substrate 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, the projection of the touch electrode covers a plurality of the sub-pixels;

The packaging layer is arranged between the sub-pixel 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 electrodes 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.

6. The touch panel of claim 5, wherein the non-display area comprises a first non-display area and a second non-display area located on opposite sides of the display area in a row direction; and third and fourth non-display regions located at opposite sides of the display region in a column direction; the binding area is positioned in the fourth non-display area; the binding area is used for binding the flexible circuit board or the touch chip;

The binding area is provided with a plurality of control ends.

7. The touch panel of claim 6, wherein the touch leads extend in a column direction;

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

8. The touch panel of claim 7, 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 and second non-display areas.

9. The touch panel of claim 6, wherein the touch leads extend in a row direction;

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

10. A driving method of a touch panel, which is applicable to the touch panel according to any one of claims 1 to 9, comprising:

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

11. The method of driving a touch panel according to claim 10, wherein the row detection circuit includes a plurality of row control switching transistors; the column detection circuit comprises a plurality of column control switching tubes; the row control switching tubes are arranged in one-to-one correspondence with the touch electrodes; the column control switch tubes are arranged in one-to-one correspondence with the touch electrodes;

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

12. The method for driving a touch panel according to claim 11, wherein,

In a first mode, each frame of image is detected by self-capacitance of touch control through one of a row detection circuit or a column detection circuit, and the method comprises the following steps:

in a first mode, each frame of image is conducted with a row control switch tube corresponding to the touch electrode row by row through a plurality of row control signals; when the row control switch tube is conducted, a plurality of row input/output ports are connected with a driving waveform and read detection signals; or alternatively

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

13. The method for driving a touch panel according to claim 11, wherein the number of rows of touch electrodes arranged in an array is plural; the number of columns of the touch electrodes arranged in the array is multiple;

In the 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 along a column direction, including:

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

in the row detection stage, a row control switching tube corresponding to the touch electrode is conducted row by row through a plurality of row 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 coordinates of the touch point along the column direction.

14. The method for driving a touch panel according to claim 11, wherein,

In the column detection stage, column control switching tubes corresponding to the touch electrodes of a plurality of columns are simultaneously conducted through a plurality of column control signals; when the column control switch tube is turned on, the plurality of column input and output ends respectively output detection signals to acquire coordinates of the active pen along the column direction;

In the row detection stage, row control switching tubes corresponding to the plurality of rows of touch electrodes are simultaneously conducted through a plurality of 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 coordinates of the active pen along the row direction.

15. The method of driving a touch panel according to claim 11, wherein the row detection circuit further comprises: a plurality of row auxiliary switching tubes; the row auxiliary switching tubes are arranged in one-to-one correspondence with the touch electrodes; 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 switching tubes corresponding to the 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 are arranged in one-to-one correspondence with the touch electrodes; the second end of the row control switch tube is electrically connected with the corresponding row input/output end through the corresponding column auxiliary switch tube; the control ends of the row auxiliary switch tubes corresponding to the touch electrodes in the same row are connected with the same row auxiliary signal end.

16. The method for driving a touch panel according to claim 15, wherein,

When the line detection circuit detects, each frame of image is conducted with a line control switch tube corresponding to the touch electrode line by line through a plurality of line control signals; if the row control switching tube corresponding to the touch electrode is in an on state, the row auxiliary switching tube corresponding to the touch electrode is in an off state; if the row auxiliary switching tube corresponding to the touch electrode is in an on state, the row control switching tube corresponding to the touch electrode is in an off state; the column control switching tube and the column auxiliary switching tube are all conducted; when the row control switch tube is conducted, a plurality of row input and output ends access to driving waveforms and read detection signals, and a plurality of column input and output ends access to the driving waveforms; or alternatively

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

17. The method for driving a touch panel according to claim 15, wherein,

In the column detection stage, column control switching tubes corresponding to the touch electrodes of a plurality of columns are simultaneously conducted through a plurality of column control signals; simultaneously turning off column auxiliary switching tubes corresponding to the multiple columns of touch electrodes through multiple column auxiliary signals; turning off row control switching tubes corresponding to the multi-row touch electrodes simultaneously through a plurality of row control signals; simultaneously conducting row auxiliary switching tubes corresponding to the plurality of rows of touch electrodes through a plurality of row auxiliary signals; when the column control switch tube is turned on, the plurality of column input and output ends respectively output detection signals to acquire coordinates of the touch point along the column direction;

In the row detection stage, column control switching tubes corresponding to the touch electrodes of a plurality of columns are turned off simultaneously through a plurality of column control signals; simultaneously conducting column auxiliary switching tubes corresponding to the touch electrodes of the multiple columns through the multiple column auxiliary signals; simultaneously conducting row control switching tubes corresponding to the plurality of rows of touch electrodes through a plurality of row control signals; turning off row auxiliary switching tubes corresponding to the plurality of rows of touch electrodes simultaneously through a plurality of 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 coordinates of the touch point along the row direction.

18. A display device comprising a touch panel according to any one of the preceding claims 1-9.