CN106775155B

CN106775155B - Touch display panel, driving method thereof and touch display device

Info

Publication number: CN106775155B
Application number: CN201611177552.5A
Authority: CN
Inventors: 余仁惠; 郗文远; 黄建才; 许育民
Original assignee: Tianma Microelectronics Co Ltd; Xiamen Tianma Microelectronics Co Ltd
Current assignee: Tianma Microelectronics Co Ltd; Xiamen Tianma Microelectronics Co Ltd
Priority date: 2016-12-19
Filing date: 2016-12-19
Publication date: 2020-01-21
Anticipated expiration: 2036-12-19
Also published as: CN106775155A

Abstract

The application discloses a touch displayDisplay panel and driving method thereof, touch display device. The touch display panel includes: the touch control circuit comprises N touch control electrodes, N first transistors, touch control signal lines, a coding circuit and an integrated drive circuit, wherein the N touch control electrodes, the N first transistors, the touch control signal lines, the coding circuit and the integrated drive circuit are arranged along a first direction and extend along a second direction; the coding circuit receives a coding control signal provided by the integrated drive circuit and outputs k control signals to each first transistor within the time of displaying a frame of picture so as to control the touch electrode to execute k times of touch scanning; wherein, at the ith touch scanning, the m-th touch scanning is arranged along the first direction_iTo n < th > of_iEach first transistor electrically connected with one touch electrode is switched on, and each first transistor electrically connected with other touch electrodes is switched off; wherein, N, k, i, m_i，n_iIs a positive integer, i is less than or equal to k, and when i is<k is m_i<m_i+1≤n_i. The touch display panel, the driving method thereof and the touch display device can improve the uniformity of touch sensing sensitivity.

Description

Touch display panel, driving method thereof and touch display device

Technical Field

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

Background

Touch display screens can be divided into self-contained touch display screens and mutual-contained touch display screens according to the touch principle of the touch display screens. In a mutual capacitance type touch display screen, a mutual capacitance is generally formed by a touch transmitting electrode and a touch sensing electrode, and a touch point is detected by measuring a change of an electric charge amount in the mutual capacitance when a touch is made.

When the mutual capacitance type touch display screen is driven, in order to obtain an accurate touch point position, a touch detection signal is generally sequentially provided to each touch emitting electrode, that is, a touch detection signal is provided to only one touch emitting electrode at a time point. However, when the touch point is located at the edge of the touch transmitting electrode, the change of the charge amount is significantly reduced, which results in a reduction of the touch sensing signal amount at the touch point, and thus the touch detection accuracy at the edge of the touch transmitting electrode is reduced, resulting in a poor uniformity of the touch detection accuracy of the entire touch display panel.

One existing solution is to bind multiple touch transmitting electrodes together and drive them simultaneously, i.e., drive multiple touch transmitting electrodes at a time, and have cross-sharing between the electrodes driven at a time and the electrodes driven last time. The driving method needs to increase the number of ports of the driving chip or adjust the architecture of the driving chip, thereby increasing the design difficulty of the driving chip and increasing the cost of the touch display panel.

Disclosure of Invention

In order to solve one or more technical problems mentioned in the background section, the present application provides a touch display panel, a driving method thereof, and a touch display device.

In one aspect, the present application provides a touch display panel, including: the touch control circuit comprises N touch control electrodes, N first transistors, touch control signal lines, a coding circuit and an integrated drive circuit, wherein the N touch control electrodes, the N first transistors, the touch control signal lines, the coding circuit and the integrated drive circuit are arranged along a first direction and extend along a second direction; the coding circuit comprises a coding input end and N coding output ends, the coding input end is electrically connected with the integrated drive circuit, and the coding output ends are electrically connected with the grids of the first transistors in a one-to-one correspondence manner; the first pole of each first transistor is electrically connected with the integrated drive circuit through a touch signal line, and the second pole of each transistor is electrically connected with the touch electrodes in a one-to-one correspondence manner; the coding circuit receives a coding control signal provided by the integrated drive circuit and outputs k control signals to each first transistor within the time of displaying a frame of picture so as to control the touch electrode to execute k times of touch scanning; wherein, at the ith touch scanning, the m-th touch scanning is arranged along the first direction_iTo n < th > of_iEach first transistor electrically connected with one touch electrode is switched on, and each first transistor electrically connected with other touch electrodes is switched off; wherein, N, k, i, m_i，n_iIs a positive integer, i is less than or equal to k, and when i is<k is m_i<m_i+1≤n_i。

In some embodiments, the encoding circuit includes a switching signal line, a clock signal line, a preset signal line, a clear signal line, N cascaded D flip-flops, and N second transistors; the D trigger comprises an input end, a clock signal end, a preset end, a zero clearing end and an output end; the clock signal end of each D trigger is electrically connected with the clock signal line, the preset end of each D trigger is electrically connected with the preset signal line, and the clear end of each D trigger is electrically connected with the clear signal line; the input end of the first-stage D trigger is electrically connected with the coding input end, and the input ends of the second-stage D trigger to the last-stage D trigger are electrically connected with the output end of the last-stage D trigger; the output end of each D trigger is electrically connected with the first pole of the second transistor in a one-to-one correspondence manner; the grid electrode of each second transistor is electrically connected with the switch signal line, and the second pole of each second transistor is electrically connected with the coding output end in a one-to-one correspondence mode.

In some embodiments, the number of the first transistors turned on at each touch scan is equal.

In some embodiments, the switching signal line is electrically connected to the integrated driving circuit; if n is_i-m_iThe switching signal line transmits a conducting signal to each second transistor as 1; if n is_i-m_i>1, the switch signal line provides a turn-off signal to each second transistor after the ith touch scanning and before the (i +1) th touch scanning.

In some embodiments, n_i-m_i＝2，m_i+1-m_i＝2。

In some embodiments, the touch electrodes are multiplexed as a common electrode.

In a second aspect, the present application provides a driving method applied to the touch display panel, where the driving method is time-sharing driving, and includes at least k touch stages within a time period of displaying a frame, the integrated driving circuit provides a coding control signal to the coding input terminal, and in an ith touch stage, the coding output terminal is connected to an mth touch stage arranged along a first direction_iTo n < th > of_iEach switch electrically connected with each touch electrode outputs a conducting signal and outputs a turn-off signal to each switch electrically connected with other touch electrodes; wherein the ratio of N, k,i，m_i，n_iis a positive integer, i is less than or equal to k, and when i is<k is m_i<m_i+1≤n_i。

In some embodiments, the encoding circuit includes a switching signal line, a clock signal line, a preset signal line, a clear signal line, N cascaded D flip-flops, and N second transistors; the D trigger comprises an input end, a clock signal end, a preset end, a zero clearing end and an output end; the clock signal end of each D trigger is electrically connected with the clock signal line, the preset end of each D trigger is electrically connected with the preset signal line, and the clear end of each D trigger is electrically connected with the clear signal line; the input end of the first-stage D trigger is electrically connected with the coding input end, and the input ends of the second-stage D trigger to the last-stage D trigger are electrically connected with the output end of the last-stage D trigger; the output end of each D trigger is electrically connected with the first pole of the second transistor in a one-to-one correspondence manner; the grid electrode of each second transistor is electrically connected with the switch signal line, and the second pole of each second transistor is electrically connected with the coding output end in a one-to-one correspondence manner; the driving method further includes: providing a conducting signal to the switch signal line at the ith touch control stage so as to conduct each second transistor; after the ith touch stage and before the (i +1) th touch stage, a turn-off signal is provided to the switch signal line to turn off each second transistor.

In some embodiments, the integrated drive circuit provides a first clock signal to the clock signal line; and if n_i-m_iProviding a turn-on signal to the switching signal line to turn on each second transistor; if n is_i-m_i>1, providing a second clock signal to a switch signal line; wherein the period of the first clock signal is T1, the period of the second clock signal is T2, and T2 is (m)_i+1-m_i) X T1, and the duty ratio of the second clock signal is 1/(m)_i+1-m_i)。

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

According to the touch display panel, the driving method thereof and the touch display device, the coding control signals provided by the integrated driving circuit are converted into k parallel control signals by using the coding circuit, so that the touch electrodes on the touch display panel are scanned in groups under the control of the k parallel control signals, and the touch electrode groups scanned by two adjacent scans are provided with at least one same touch electrode, binding scanning can be realized without adjusting ports or frameworks of the integrated driving circuit, the touch signal amount fed back at the edges of the touch electrodes can be improved, and the uniformity of touch sensing sensitivity is improved.

Drawings

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

fig. 1 is a schematic structural diagram of an embodiment of a touch display panel provided in the present application;

FIG. 2 is a circuit diagram of one embodiment of an encoding circuit provided herein;

FIG. 3 is a schematic diagram of a D flip-flop in the encoding circuit of FIG. 2;

FIG. 4 is a schematic diagram of the operation of the D flip-flop of FIG. 3;

fig. 5 is a schematic perspective view of a touch display panel provided in the present application;

FIG. 6 is a timing diagram illustrating operation of the encoding circuit of FIG. 2;

FIG. 7 is another timing diagram illustrating operation of the encoding circuit of FIG. 2;

fig. 8 is a schematic structural diagram of a touch display device provided in the present application.

Detailed Description

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

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

Please refer to fig. 1, which shows a schematic structural diagram of an embodiment of a touch display panel provided in the present application.

As shown in fig. 1, the touch display panel 100 includes N touch electrodes 11 arranged along a first direction and extending along a second direction, N first transistors 12, a touch signal line 13, an encoding circuit 14, and an integrated driving circuit 15, where N is a positive integer. The coding circuit 14 includes a coding input terminal In and N coding output terminals Out1, Out2, Out3, Out4, …, Out-1, and Out N, the coding input terminal In is electrically connected to the integrated driving circuit 15 and can receive a coding control signal from the integrated driving circuit 15, and the coding output terminals Out1, Out2, Out3, Out4, …, Out-1, and Out N are electrically connected to the gates of the N first transistors 12 In a one-to-one correspondence manner. A first pole of each first transistor 12 is electrically connected to the integrated driving circuit 15 through the touch signal line 13, and a second pole of each first transistor 12 is electrically connected to each touch electrode 11 in a one-to-one correspondence. That is, each first transistor 12 transmits the signal on the touch signal line 13 to the corresponding touch electrode 11 under the control of the signal output from the corresponding encoding output terminal of the encoding circuit 14. Alternatively, the first direction may be perpendicular to the second direction.

The encoding circuit 14 may receive the encoding control signal provided by the integrated driving circuit 15, and output k encoding control signals to each first transistor within a time period of displaying one frame of picture, so as to control each touch electrode 11 to perform k touch scans.

In the k touch scans, the ith touch scan is aligned with the m-th touch scan along the first direction_iTo n < th > of_iEach first transistor 12 electrically connected to one touch electrode 11 is turned on, and each first transistor 12 electrically connected to another touch electrode 11 is turned off, wherein k, i, m_i，n_iIs a positive integer, i is less than or equal to k, and when i is<k is m_i<m_i+1≤n_i. I.e. at the ith touch scan, m_iTo n < th > of_iOne touch electrode 11 receives the touch signal transmitted by the touch signal line 13, and the other touch electrodes 11 are disconnected from the touch signal line 13, at this time, the mth touch electrode 11_iTo n < th > of_iThe touch electrodes 11 are equivalently bundled together for touch scanning.

And analogy is carried out, if i +1 is less than or equal to k, in the (i +1) th touch scanning, the m-th touch scanning is arranged along the first direction_i+1To n < th > of_i+1Each of the first transistors 12 electrically connected to one of the touch electrodes 11 is turned on, and each of the first transistors 12 electrically connected to the other touch electrode 11 is turned off. I.e. at the (i +1) th touch scan, m_i+1To n < th > of_i+1One touch electrode 11 receives the touch signal transmitted by the touch signal line 13, and the other touch electrodes 11 are disconnected from the touch signal line 13, at this time, the mth touch electrode 11_i+1To n < th > of_i+1The touch electrodes 11 perform touch scanning.

As can be seen from the above, at least one touch electrode 11 performs touch scanning in both the ith touch scanning and the (i +1) th touch scanning. Specifically, m-th_i+1To n < th > of_iThe touch electrodes are repeatedly scanned in the two touch scans, and after the k touch scans, the touch electrodes on the touch display panel 100 are repeatedly scanned, that is, the touch display panel 100 implements the binding scroll scan.

In this embodiment, the encoding circuit 14 may receive the encoding control signal provided by the integrated driving circuit 15 through an input terminal In, convert the signal into a plurality of parallel control signals corresponding to the N touch electrodes 12 one by one, and output the control signals to the N output terminals. If the encoding control signal provided by the integrated driving circuit 15 to the encoding circuit 14 is a serial signal, the encoding circuit 14 may convert the serial signal into a plurality of parallel signals to output, so as to control the touch display panel 100 to perform multiple touch scans. Since the encoding circuit 14 only needs to occupy one port of the integrated driving circuit without adjusting the architecture of the integrated driving circuit, the design cost of the driving architecture is reduced while the uniformity of the touch precision is improved by using the binding scroll scanning.

With continuing reference to FIG. 2, a circuit diagram of one embodiment of an encoding circuit provided herein is shown. As shown in fig. 2, the encoding circuit 200 may be the encoding circuit 14 shown in fig. 1, and includes a switch signal line SW, a clock signal line CLK, a preset signal line SD, a clear signal line RD, N cascaded D flip-flops D1, D2, D3, …, DN-1, DN, and N second transistors M21, M22, M23, …, M2N-1, M2N.

Each D flip-flop comprises an input end Din, a clock signal end CP, a preset end S, a clear end R and an output end Q, wherein the output ends of the first-Nth-stage D flip-flops can be sequentially represented by Q1, Q2, Q3, …, QN-1 and QN. The clock signal end CP of each D trigger is electrically connected with a clock signal line CLK, the preset end S of each D trigger is electrically connected with a preset signal line SD, and the clear end R of each D trigger is electrically connected with a clear signal line RD. An input end Din of a first-stage D trigger D1 is electrically connected with an encoding input end In, an input end Din of a second-stage to last-stage D trigger D2 to DN is electrically connected with an output end Q of a previous-stage D trigger, output ends Q of the D triggers D1, D2, D3, …, DN-1 and DN are electrically connected with first poles of second transistors M21, M22, M23, …, M2N-1 and M2N In a one-to-one correspondence mode, gates of the second transistors M21, M22, M23, …, M2N-1 and M2N are electrically connected with a switching signal line SW, and second poles of the second transistors M21, M22, M23, …, M2N-1 and M2N are electrically connected with encoding output ends Out1, Out2, Out3, Out …, OutN-1 and OutN In a one-to one correspondence mode. In this embodiment, as shown in fig. 2, each stage of D flip-flop may further include an inverting output terminal

Reverse output end

The output signal and the output end Q are mutually inverse signals.

The D flip-flop is inverted at the rising edge of the clock pulse signal input from the clock signal end CP (i.e. the time when the low potential jumps to the high potential), and the secondary state of the D flip-flop depends on the state of the input end Din before the rising edge of the pulse of CP arrives. When the preset terminal S is at a high potential and the reset terminal R is at a low potential (or true value, S is 1 and R is 0), the output terminal Q outputs a high potential signal (true value, Q is 1) regardless of the state of the input terminal Din; when the preset terminal S is at a low potential and the reset terminal R is at a high potential (or true value, S is 0 and R is 1), the output terminal Q outputs a low potential signal (true value, Q is 0) regardless of the state of the input terminal Din; when the preset terminal S has a high potential and the clear terminal R has a high potential (or when S is 1 and R is 1 in a truth table), the output terminal Q outputs a potential signal corresponding to the rising edge of the clock pulse signal input from the clock signal terminal CP at the input terminal Din.

Specifically, the D flip-flop includes 6 nand gates, and fig. 3 shows a schematic structural diagram of the D flip-flop in the encoding circuit shown in fig. 2.

As shown in fig. 3, the D flip-flop 300 may be any one of the D flip-flops D1, D2, D3, …, DN-1 or DN shown in fig. 2, and includes a first NAND gate NAND1, a second NAND gate NAND2, a third NAND gate NAND3, a fourth NAND gate NAND4, a fifth NAND gate NAND5 and a sixth NAND gate NAND 6. Each NAND gate comprises three input ends and an output end, and each NAND gate outputs signals input by the three input ends to the corresponding output end after performing NAND operation on the signals. Three input ends n11, n12 and n13 of a first NAND gate NAND1 are respectively connected with an input end Din of a D flip-flop, an output end n24 of a second NAND gate NAND2 and a zero clearing end R, and an output end n14 of the first NAND gate is connected with a second input end n22 of the second NAND gate NAND 2; the first input end n21 and the third input end n23 of the second NAND gate NAND2 are respectively connected with the output end n54 and the clock signal end CP of the fifth NAND gate NAND; three input ends n31, n32 and n33 of a third NAND gate NAND3 are respectively connected with the output end n64 of a sixth NAND gate NAND6 and the output end n24 and the zero clearing end R of a second NAND gate NAND2, and the output end n34 and the inverted output end of the third NAND gate NAND3

Connecting; three input ends n41, n42 and n43 of a fourth NAND gate 4 are respectively connected with an output end n54 of a fifth NAND gate NAND5, a preset end S and an output end n14 of the first NAND gate NAND, and three input ends n51, n52 and n53 of the fifth NAND gate 5 are respectively connected with a clock signal end CP, an output end n44 of a fourth NAND gate 4 and a zero clearing end R; three inputs of a sixth NAND gate NAND6n61, n62 and n63 are respectively connected to the preset terminal S, the output terminal n54 of the fifth NAND gate NAND5 and the output terminal n34 of the third NAND gate NAND3, and the output terminal of the sixth NAND gate NAND6 is connected to the output terminal Q of the D flip-flop.

Fig. 4 shows a schematic operating principle of the D flip-flop shown in fig. 3. As shown in fig. 4, at the time of the rising edge T1 of the clock signal input from the clock signal terminal CP, the signal output from the output terminal Q of the D flip-flop is in the first level (high level) V1 state, which is the same as the state of the signal output from the input terminal Din at the time before the rising edge T1. When the signal at the input terminal Din changes from the first level V1 to the second level (low level) V2 between the time T1 of the rising edge of the clock signal input from the clock signal terminal CP and the time T2 of the next rising edge, at the time T2 of the next rising edge, the signal output from the output terminal Q of the D flip-flop changes to the second level (low level) V2 state in the same manner as the state of the signal at the input terminal Din before the time T2 of the rising edge.

As can be seen from fig. 4, the signal output by the output terminal Q of the D flip-flop is the same as the signal level of the input terminal Din before the rising edge of the clock signal input by the clock signal terminal CP, if a plurality of D flip-flops are cascaded, that is, the input terminal Din of the first stage D flip-flop is used as the input terminal of the whole circuit after the cascade, the input terminals Din of the remaining stages of D flip-flops are connected to the output terminal Q of the last stage D flip-flop, and the clock signal terminals of the stages of D flip-flops all receive the same clock signal, the signal input by the input terminal Din of the first stage D flip-flop is transmitted to the next stage D flip-flop on each rising edge of the clock signal, and after N rising edges of the clock signal, the signal input by the input terminal Din of the first stage D flip-flop is transmitted to the output terminal Q of the nth stage. As can be seen from this, if the signal input to the input terminal Din of the first-stage D flip-flop is a serial level signal that changes with time, the output terminal of the N-stage D flip-flop can output N parallel level signals at the time of each rising edge of the clock signal.

In some alternative implementations of the touch display panel shown in fig. 1, the number of the first transistors 12 turned on in each touch scan is equal, that is, the number of the touch electrodes performing the touch scan in each touch scan is equal. Because the waveforms of the signals output by the output ends of the D triggers at all levels in the coding circuit are similar, that is, the duration time of each level is approximate or equal, and whether the touch signals are transmitted to the touch electrodes or not is controlled by the switch signal line, the signals provided by the switch signal line can be simplified when the number of the touch electrodes executing touch scanning in each touch scanning is equal, and the load of the integrated drive circuit is reduced.

In a further implementation, n is as described above_i-m_i2, and m_i+1-m_i2. That is, the three touch electrodes sequentially arranged along the first direction in each touch scan perform the touch scan, and the (i +1) th touch scan and the (i) th touch scan repeatedly scan only one touch electrode. Specifically, the jth touch scanning is performed on the (2 xj-1) th touch electrode to the (2 xj +1) th touch electrode, wherein j is more than or equal to 1 and less than or equal to k. In an actual scenario, the third touch electrode, the fifth touch electrode, the seventh touch electrode, and … are scanned twice in a complete touch scanning period of the touch display panel, so that when the touch point is located at the edge of the touch electrodes, the detected touch signal amount is significantly increased, the touch sensitivity of the edge of at least a portion of the touch electrodes can be increased, and the uniformity of the touch sensitivity is further improved.

When the encoding circuit shown in fig. 2 is applied to the touch display panel shown in fig. 1, the switch signal line SW may be electrically connected to the integrated driving circuit 15. The switch signal line SW is used to control whether the signal output from the flip-flop of each stage D is transmitted to the first transistor 12. In some optional implementations of this embodiment, if n_i-m_iWhen touch scanning is performed on the two touch electrodes at each touch scanning, the switch signal line SW transmits a turn-on signal to each of the second transistors M21, M22, M23, …, M2N-1, and M2N; if n is_i-m_i>1, that is, each time the touch scan is performed on at least three touch electrodes, the switch signal line SW provides a turn-off signal to each of the second transistors M21, M22, M23, …, M2N-1, M2N after the ith touch scan and before the (i +1) th touch scan.

According to the working principle of the D flip-flops and the working principle of the encoding circuit described above, the signals output by the D flip-flops at each stage on some rising edges of the clock signal may not be used to control the first transistor to be turned on, for example, when n is_i-m_i＝2，m_i+1-m_iWhen the clock signal rises, the true values of the signals output by the first-level to nth-level D flip-flops are sequentially 0, 1, 0, … 0, and 0, the switch signal line SW needs to turn off each second transistor, so as to ensure that the output signal of each level D flip-flop at the time is not transmitted to the output end of the coding circuit, thereby ensuring that the connection between each touch electrode and the touch signal line is disconnected at the time, and the second-level to fourth-level touch electrodes do not execute touch scanning, so as to ensure that the touch display panel rolls back two touch electrodes group by group according to three touch electrodes in each group (that is, N is satisfied)_i-m_i＝2，m_i+1-m_i2) performing touch scanning in a binding driving mode.

In some embodiments, the touch electrode 11 in the touch display panel 100 may be reused as a common electrode, and in the display stage, the touch electrode 11 may receive a common voltage signal provided by the integrated driving circuit 15 to provide a common voltage required for displaying for the pixels on the touch display panel.

Further referring to fig. 5, a schematic perspective view of the touch display panel provided in the present application is shown, that is, a schematic perspective view of the touch display panel shown in fig. 1 is shown. As shown in fig. 5, the touch display panel 500 includes an array substrate 501 and a color filter substrate 502 disposed opposite to the array substrate 501. The N touch electrodes 510 arranged along the first direction and extending along the second direction may be disposed on the array substrate 501. The touch display panel 500 further includes N first transistors 512, a touch signal line 513, a coding circuit 514, and an integrated driving circuit 515.

The touch electrode 510 may be a first touch electrode, the color filter substrate 502 is provided with a second touch electrode 520, and an extending direction of the second touch electrode 520 intersects with an extending direction of the first touch electrode 510. Optionally, the second touch electrodes 520 are arranged along the second direction and extend along the first direction. The first direction may be perpendicular to the second direction.

In this embodiment, the display panel 500 may further include a flexible circuit board 521. The color film substrate 52 may be provided with a touch sensing signal line 522, the second touch electrode 520 is electrically connected to the flexible circuit board 521 through the touch sensing signal line 522, and the flexible circuit board 521 is electrically connected to the integrated driving circuit 515.

As shown in fig. 5, in some optional implementations, the first transistor 512, the touch signal line 513 and the encoding circuit 514 are disposed on the array substrate 501. At this time, the integrated driving circuit 515 may be configured to provide a touch signal to the touch signal line 513, receive a touch sensing signal returned from the touch sensing signal line 522 through the flexible circuit board 521, and further determine a position of a touch point according to the touch sensing signal, and the integrated driving circuit 515 may also be used as a display IC (integrated circuit) to control the touch display panel to display.

In other optional implementation manners, the N first transistors 512, the touch signal line 513, the coding circuit 514, and the integrated driving circuit 515 may all be disposed on the flexible circuit board 521 or all be disposed on the color film substrate 502; or the N first transistors 512, the touch signal lines 513 and the encoding circuit 514 are disposed on the array substrate or the color film substrate, and the integrated driving circuit 515 may be disposed on the flexible circuit board 521, where the integrated driving circuit 515 is a touch IC, and is configured to provide a touch signal to the first touch electrode 510 and receive a touch sensing signal returned by the second touch electrode 520. The touch display panel may further include a display integrated driving circuit (or a display IC), and the integrated driving circuit 515 may be electrically connected to the display integrated driving circuit.

The embodiment of the present application further provides a driving method applied to the

touch display panel

100 or 500, where the method is time-sharing driving and includes at least k touch stages within a time period of displaying a frame of picture. The integrated drive circuit or circuitThe coding input end of the coding circuit provides a coding control signal, and in the ith touch control stage, each coding output end is arranged towards the mth direction arranged along the first direction_iTo n < th > of_iEach first transistor electrically connected with one touch electrode outputs a conducting signal, and outputs a switching-off signal to each first transistor electrically connected with other touch electrodes; wherein, N, k, i, m_i，n_iIs a positive integer, i is less than or equal to k, and when i is<k is m_i<m_i+1≤n_i. That is, the encoding circuit is arranged to the m-th touch stage arranged along the first direction at any ith touch stage according to the encoding control signal received by the encoding input terminal_iTo n < th > of_iEach first transistor electrically connected to the touch electrode provides a conducting signal, and the m-th transistor_iTo n < th > of_iThe touch control signal line is connected with the touch control signal line, and the touch control signal line is connected with the touch control signal line.

Further, the encoding circuit may be the encoding circuit shown in fig. 2, and includes a switch signal line SW, a clock signal line CLK, a preset signal line SI, a clear signal line RI, N cascaded D flip-flops D1, D2, D3, …, DN-1, DN, and N second transistors M21, M22, M23, …, M2N-1, M2N; each D trigger comprises an input end Din, a clock signal end CP, a preset end S, a zero clearing end R and an output end Q; the clock signal end CP of each D trigger is electrically connected with a clock signal line CLK, the preset end S of each D trigger is electrically connected with a preset signal line SD, and the clear end R of each D trigger is electrically connected with a clear signal line RD; the input end Din of the first-stage D trigger is electrically connected with the coding input end In, and the input ends Din of the second-stage D trigger to the last-stage D trigger are electrically connected with the output end Q of the last-stage D trigger; the output end Q of each D flip-flop D1, D2, D3, …, DN-1 and DN is electrically connected with the first poles of the second transistors M21, M22, M23, …, M2N-1 and M2N in a one-to-one correspondence manner; the gates of the second transistors M21, M22, M23, …, M2N-1 and M2N are electrically connected with the switch signal line SW, and the second poles of the second transistors M21, M22, M23, …, M2N-1 and M2N are in one-to-one correspondence with the coding output terminals Out1, Out2, Out3, …, OutN-1 and OutNAnd (6) electrically connecting. In this case, the driving method may further include: providing a conducting signal to the switch signal line SW at the ith touch control stage so as to conduct each second transistor in the coding circuit; after the ith touch stage and before the (i +1) th touch stage, a turn-off signal is provided to the switch signal line SW to turn off each transistor in the encoding circuit. Further, in the above driving method, the integrated driving circuit supplies the first clock signal to the clock signal line if n is the number of the first clock signal lines_i-m_iProviding a turn-on signal to the switching signal line to turn on each second transistor; if n is_i-m_i>1, supplying a second clock signal to the switching signal line, wherein the period of the first clock signal is T1, the period of the second clock signal is T2, and T2 is (m ═ m)_i+1-m_i) X T1, and the duty ratio of the second clock signal is 1/(m)_i+1-m_i)。

The following is given by n_i-m _i1 and n_i-m_iThe principle of driving the touch display panel by the driving method is further described with reference to fig. 6 and fig. 7 as an example.

Referring to fig. 6, it shows an operation timing diagram of the encoding circuit shown In fig. 2, In which signals output by the switch signal line SW, the clock signal line CLK, the encoding input terminal In, the output terminals Q1, Q2, Q3, Q4, Q5, Q6, …, QN-1, QN and the 1 st to nth output terminals Out1, Out2, Out3, Out4, Out5, Out6, …, Out-1, and Out N In the encoding circuit shown In fig. 2 are shown.

It should be noted that fig. 6 illustrates an operation principle of applying the encoding circuit to the touch display panel shown in fig. 1, and only two touch electrodes are scanned in each touch scan of the touch display panel, that is, n is described above_i-m _i1, and m_i+1＝n_i. Specifically, the first and second touch electrodes arranged along the first direction in the first touch scanning are scanned, the second and third touch electrodes arranged along the first direction in the second touch scanning are scanned, the third and fourth touch electrodes arranged along the first direction in the third touch scanning are scanned, and the third touch electrode is scannedThe ith touch electrode and the (i +1) th touch electrode arranged along the first direction in the i touch scanning are scanned, and the (N-1) th touch electrode and the (N +1) th touch electrode arranged along the first direction in the k touch scanning are scanned.

As shown In fig. 6, after the rising edge CP0 of the clock signal inputted from the clock signal line CLK, the encode input terminal In inputs a first level (e.g., high level) signal and maintains the input of the first level signal at the first rising edge CP1, the output terminal Q1 of the first stage D flip-flop outputs the first level signal at the first rising edge CP 1; after the second rising edge CP2, the signal inputted from the code input terminal In jumps to a second level (e.g., low level) signal, and the signal inputted from each of the following rising edge code input terminals maintains the second level signal, the output terminal Q1 of the first stage D flip-flop jumps to the second level signal at the 3 rd rising edge CP3, and the output terminal Q1 of the first stage D flip-flop maintains the second level signal at each of the following rising edges. It can be seen that the signal output from the output terminal Q1 of the first stage D flip-flop is a first level signal in the first to third rising edges CP1 to CP3 of the clock signal edge input from the clock signal line CLK, and the signal output from the output terminal Q1 of the first stage D flip-flop is a second level signal in other periods. It should be noted that the first level signal here is a turn-on signal of the first transistor 12 in the touch display panel 100 shown in fig. 1, and each first transistor 12 is turned on under the control of the first level signal; the second level signal is a turn-off signal of the first transistor 12 in the touch display panel 100 shown in fig. 1, and each first transistor 12 is turned off under the control of the second level signal.

In the driving method shown in fig. 6, the switch signal line SW is provided with a turn-on signal, and each second transistor is turned on, that is, the signal output from the output terminal of each stage D flip-flop is directly transmitted to each first transistor. The time period for the output end Out1 of the first stage D flip-flop and the output end Out2 of the second stage D flip-flop to output the first level signal is a first Touch stage Touch1, the time period for the output end Out2 of the second stage D flip-flop and the output end Out3 of the third stage D flip-flop to output the first level signal is a second Touch stage Touch2, the time period for the output end Out3 of the third stage D flip-flop and the output end Out4 of the fourth stage D flip-flop to output the first level signal is a third Touch stage Touch3, the time period for the output end Out4 of the fourth stage D flip-flop and the output end Out5 of the fifth stage D flip-flop to output the first level signal is a fourth Touch stage Touch4, the output end Out5 of the fifth stage D flip-flop and the output end Out6 of the sixth stage D flip-flop to output the first level signal is a fifth Touch stage Touch5, and the output end Out i +1 + output end Out i of the first stage D flip-flop is a first Touch stage Touch5, and the output end Out1 + D flip-flop is a Touch stage D flip-flop And in the Touch control stage Touch hi, the time period for which the output end Out (N-2) of the N-2 th stage D trigger and the output end Out (N-1) of the N-1 th stage D trigger output the first level signal is the kth-1 Touch control stage Touch (k-1), and the time period for which the output end Out (N-1) of the N-1 th stage D trigger and the output end OutN of the N-1 th stage D trigger output the first level signal is the kth Touch control stage Touch.

As can be seen from fig. 6, in the k touch phases, there is no time interval between two adjacent touch phases, that is, the i +1 th touch scan is immediately performed after the i-th touch scan is finished. At this time, since the switch signal line provides the conducting signal and each second transistor is conducted, the signals output by each coding output terminal Out1, Out2, Out3, Out4, …, Out-1 and Out n are respectively consistent with the signals output by the output terminals Q1, Q2, Q3, …, QN-1 and QN of the corresponding D flip-flops at each stage. In this way, in the ith touch stage touchdown, the ith touch electrode and the (i +1) th touch electrode receive the touch signal transmitted by the touch signal line, and perform touch scanning.

Referring to fig. 7, another operation timing diagram of the encoding circuit shown In fig. 2 is shown, In which signals output by the switch signal line SW, the clock signal line CLK, the encoding input terminal In, the output terminals Q1, Q2, Q3, Q4, Q5, Q6, …, QN-1, QN and the 1 st to nth output terminals Out1, Out2, Out3, Out4, Out5, Out6, …, Out-1, and Out N In the encoding circuit shown In fig. 2 are shown.

It should be noted that fig. 7 shows the operation principle of the encoding circuit applied to the touch display panel shown in fig. 1And scanning three touch electrodes in each touch scanning of the touch display panel, namely n_i-m_i2, and m_i+1＝n_i. Specifically, the first to third touch electrodes arranged along the first direction in the first touch scan are scanned, the third to fifth touch electrodes arranged along the first direction in the second touch scan are scanned, the fifth to seventh touch electrodes arranged along the first direction in the third touch scan are scanned, the (2 × i-1) th to (2 × i-1) th touch electrodes arranged along the first direction in the i-th touch scan are scanned, and the N-2 to N-th touch electrodes arranged along the first direction in the k-th touch scan are scanned.

In fig. 7, a first clock signal is supplied to the clock signal line, and a second clock signal is supplied to the switch signal line SW. The signal output by the output Qi of the D flip-flop is only transmitted to the corresponding encoding output Outi during the high level period of the second clock signal.

In fig. 7, the time period during which the output terminal Q1 of the first stage D flip-flop, the output terminal Q2 of the second stage D flip-flop, and the output terminal Q3 of the third stage D flip-flop output the first level signal is the first Touch phase Touch 1. At this time, SW provides a high level signal, the first encoding output terminal Out1, the second encoding output terminal Out2 and the third encoding output terminal Out3 output a first level signal, the first transistors connected to the first to third touch electrodes arranged along the first direction are turned on, the first to third touch electrodes receive the touch signal transmitted by the touch signal line, the first transistors connected to the other touch electrodes are turned off, and the other touch electrodes do not receive the touch signal.

The time period during which the output terminal Q3 of the third stage D flip-flop, the output terminal Q4 of the fourth stage D flip-flop, and the output terminal Q5 of the fifth stage D flip-flop output the first level signal is the second Touch stage Touch 2. At this time, SW provides a high level signal, the third encoding output terminal Out3, the fourth encoding output terminal Out4 and the fifth encoding output terminal Out5 output a first level signal, the first transistors connected to the third to fifth touch electrodes arranged along the first direction are turned on, the third to fifth touch electrodes receive the touch signal transmitted by the touch signal line, the first transistors connected to the other touch electrodes are turned off, and the other touch electrodes do not receive the touch signal.

The time period for the output terminal Q5 of the fifth-stage D flip-flop, the output terminal Q6 of the sixth-stage D flip-flop, and the output terminal Q7 of the seventh-stage D flip-flop to output the first level signal is the third Touch stage Touch 3. At this time, SW provides a high level signal, the fifth encoding output terminal Out5, the sixth encoding output terminal Out6 and the seventh encoding output terminal Out7 output a first level signal, the first transistors connected to the fifth to seventh touch electrodes arranged along the first direction are turned on, the fifth to seventh touch electrodes receive the touch signal transmitted by the touch signal line, the first transistors connected to the other touch electrodes are turned off, and the other touch electrodes do not receive the touch signal.

The time period when the output end Q (2i-1) of the (2 xi-1) th-stage D flip-flop, the output end Q (2i) of the 2 i-th-stage D flip-flop and the output end Q (2i +1) of the (2 xi +1) th-stage D flip-flop output the first level signal is the ith touch stage Touchi. At this time, SW provides a high level signal, the (2 × i-1) th encoding output terminal Out (2i-1), the 2i th encoding output terminal Out (2i) and the (2 × i +1) th encoding output terminal Out (2i +1) output a first level signal, a first transistor connected to the (2 × i-1) th to (2 × i +1) th touch electrodes arranged along the first direction is turned on, the (2 × i-1) th to (2 × i +1) th touch electrodes receive a touch signal transmitted by a touch signal line, the first transistor connected to the other touch electrodes is turned off, and the other touch electrodes do not receive the touch signal.

The time period when the output end Q (N-2) of the N-2 th level D trigger, the output end Q (N-1) of the N-1 th level D trigger and the output end QN of the N-1 th level D trigger output the first level signal is the kth touch control stage Touchk. At this time, SW provides a high level signal, the N-2 coded output end Out (N-2), the N-1 coded output end Out (N-1) and the Nth coded output end OutN output a first level signal, first transistors connected with the N-2 to the Nth touch control electrodes arranged along the first direction are conducted, the N-2 to the Nth touch control electrodes receive touch control signals transmitted by touch control signal lines, the first transistors connected with other touch control electrodes are turned off, and other touch control electrodes do not receive the touch control signals.

In this embodiment, a certain time interval is provided between two adjacent touch phases, and the switch signal line SW provides a turn-off signal in the time interval to turn off each second transistor. For example, between the first Touch stage Touch1 and the second Touch stage Touch2, the output terminal Q2 of the second stage D flip-flop, the output terminal Q3 of the third stage D flip-flop, and the output terminal Q4 of the fourth stage D flip-flop output the first level signal, the output terminals of the other D flip-flops output the second level signal, and at this time, the switch signal line SW provides the second level signal, the first transistor connected to each Touch electrode is turned off, and each encoding output terminal outputs the second level signal, and at this time, each Touch electrode does not receive the Touch signal. And ensuring that the Touch display panel only carries out Touch scanning at Touch stages of Touch1, Touch2, Touch3, … and Touch.

As can be seen from fig. 7, the second period T2 of the second clock signal supplied to the switching signal line SW is 2 times the first period T1 of the first clock signal supplied to the clock signal line CLK, and the duty ratio of the second clock signal is 1/2. By analogy, T2 ═ m_i+1-m_i) X T1, and the duty ratio of the second clock signal is 1/(m)_i+1-m_i)。

By using the driving method, the integrated driving circuit only needs to provide a serial coding control signal to the coding circuit through one port, and the coding circuit can convert the serial signal into a plurality of parallel signals to be output, so that the touch display panel is controlled to execute a plurality of times of touch scanning, and at least one touch electrode is repeatedly scanned by two adjacent times of touch scanning. In the process, the coding circuit only needs to occupy one port of the integrated drive circuit without adjusting the framework of the integrated drive circuit, so that the uniformity of the touch precision is improved by utilizing the binding scroll scanning, and the design cost of the drive framework is reduced.

An embodiment of the present application further provides a touch display device, as shown in fig. 8. The touch display device 800 may be a liquid crystal display device, including the

touch display panel

100 or 500.

It can be understood that the touch display device may further include a backlight source, a light guide plate, a liquid crystal layer located between the array substrate and the color film substrate, a polarizer, a protective glass, and other known structures, which are not described herein again.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. A touch display panel, comprising: the touch control circuit comprises N touch control electrodes, N first transistors, touch control signal lines, a coding circuit and an integrated drive circuit, wherein the N touch control electrodes, the N first transistors, the touch control signal lines, the coding circuit and the integrated drive circuit are arranged along a first direction and extend along a second direction;

the coding circuit comprises a coding input end and N coding output ends, the coding input end is electrically connected with the integrated drive circuit, and the coding output ends are electrically connected with the grids of the first transistors in a one-to-one correspondence manner;

the coding circuit comprises a switch signal line, a clock signal line, a preset signal line, a clear signal line, N cascaded D triggers and N second transistors;

the D trigger comprises an input end, a clock signal end, a preset end, a zero clearing end and an output end; the clock signal end of each D trigger is electrically connected with the clock signal line, the preset end of each D trigger is electrically connected with the preset signal line, and the clear end of each D trigger is electrically connected with the clear signal line; the input end of the first-stage D trigger is electrically connected with the coding input end, and the input ends of the second-stage to the last-stage D triggers are electrically connected with the output end of the last-stage D trigger; the output end of each D trigger is electrically connected with the first pole of the second transistor in a one-to-one correspondence manner;

the grid electrode of each second transistor is electrically connected with the switch signal wire, and the second pole of each second transistor is electrically connected with the coding output end in a one-to-one correspondence manner;

a first pole of each first transistor is electrically connected with the integrated drive circuit through the touch signal line, and a second pole of each first transistor is electrically connected with the touch electrode in a one-to-one correspondence manner;

the coding circuit receives a coding control signal provided by the integrated drive circuit and outputs k control signals to each first transistor within the time of displaying a frame of picture so as to control the touch electrode to execute k times of touch scanning; wherein, at the ith touch scanning, the m-th touch scanning is arranged along the first direction_iTo n < th > of_iEach first transistor electrically connected with the touch electrode is turned on, and each first transistor electrically connected with other touch electrodes is turned off;

wherein, N, k, i, m_i，n_iIs a positive integer, i is less than or equal to k, and when i is<k is m_i<m_i+1≤n_i。

2. The touch display panel according to claim 1, wherein the number of the first transistors turned on in each touch scan is equal.

3. The touch display panel according to claim 2, wherein the switch signal line is electrically connected to the integrated driving circuit;

if n is_i-m_i1, the switching signal line transmits a turn-on signal to each of the second transistors;

if n is_i-m_i>1, the switch signal line provides a turn-off signal to each of the second transistors after the ith touch scan and before the (i +1) th touch scan.

4. The touch display panel of claim 3, whichCharacterized in that n is_i-m_i＝2，m_i+1-m_i＝2。

5. The touch display panel according to claim 1, wherein the touch electrodes are multiplexed as a common electrode.

6. The driving method applied to the touch display panel of claim 1, wherein the driving method is a time-division driving, and comprises at least k touch stages within a period of displaying a frame,

the integrated drive circuit provides a coding control signal to the coding input end, and the coding output end is arranged towards the mth direction arranged along the first direction in the ith touch control stage_iTo n < th > of_iEach first transistor electrically connected with the touch electrode outputs a turn-on signal, and outputs a turn-off signal to each first transistor electrically connected with other touch electrodes;

wherein, N, k, i, m_i，n_iIs a positive integer, i is less than or equal to k, and when i is<k is m_i<m_i+1≤n_i；

The coding circuit comprises a switch signal line, a clock signal line, a preset signal line, a clear signal line, N cascaded D triggers and N second transistors; the D trigger comprises an input end, a clock signal end, a preset end, a zero clearing end and an output end; the clock signal end of each D trigger is electrically connected with the clock signal line, the preset end of each D trigger is electrically connected with the preset signal line, and the clear end of each D trigger is electrically connected with the clear signal line; the input end of the first-stage D trigger is electrically connected with the coding input end, and the input ends of the second-stage to the last-stage D triggers are electrically connected with the output end of the last-stage D trigger; the output end of each D trigger is electrically connected with the first pole of the second transistor in a one-to-one correspondence manner; the grid electrode of each second transistor is electrically connected with the switch signal line, and the second pole of each second transistor is electrically connected with the coding output end in a one-to-one correspondence mode.

7. The driving method according to claim 6,

the driving method further includes:

providing a conducting signal to the switch signal line at an ith touch control stage so as to conduct each second transistor;

after the ith touch stage and before the (i +1) th touch stage, a turn-off signal is provided to the switch signal line to turn off each of the second transistors.

8. The driving method according to claim 7, characterized in that the driving method further comprises:

the integrated driving circuit provides a first clock signal to the clock signal line; and the number of the first and second groups,

if n is_i-m_iProviding a turn-on signal to the switching signal line to turn on each of the second transistors;

if n is_i-m_i>1, providing a second clock signal to the switch signal line;

wherein the period of the first clock signal is T1, the period of the second clock signal is T2, and T2 is (m)_i+1-m_i) X T1, and the duty ratio of the second clock signal is 1/(m)_i+1-m_i)。

9. A touch display device comprising the touch display panel according to any one of claims 1 to 5.