CN112379790B - Driving method and driving circuit of touch display panel and touch display device - Google Patents

Driving method and driving circuit of touch display panel and touch display device Download PDF

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Publication number
CN112379790B
CN112379790B CN202011231808.2A CN202011231808A CN112379790B CN 112379790 B CN112379790 B CN 112379790B CN 202011231808 A CN202011231808 A CN 202011231808A CN 112379790 B CN112379790 B CN 112379790B
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touch
area
electrodes
areas
touch area
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CN112379790A (en
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邹宗骏
张传煌
孙莹
许育民
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Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Human Computer Interaction (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Position Input By Displaying (AREA)

Abstract

The invention discloses a driving method and a driving circuit of a touch display panel and a touch display device. Comprising the following steps: applying first touch scanning signals to M touch electrodes in different touch areas in a time-sharing mode; determining a touch area according to touch detection signals fed back by M touch electrodes of each touch area; when the touch area is the L-th touch area, applying a first touch scanning signal to M touch electrodes of at least part of the N touch areas; wherein at least part of the touch areas comprise an L-th touch area; determining a touch position according to a touch detection signal fed back by a touch electrode of the L-th touch area; wherein Q, L, M and N are positive integers greater than or equal to 1; l is less than or equal to N; the time period of applying the first touch scanning signal to the M touch electrodes of different touch areas in a time-sharing manner is longer than the time period of applying the first touch scanning signal to the M touch electrodes of at least part of the N touch areas when the touch area is the L-th touch area.

Description

Driving method and driving circuit of touch display panel and touch display device
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a driving method and a driving circuit of a touch display panel and a touch display device.
Background
As touch operation is a simple and convenient human-computer interaction mode, more and more products integrate touch functions into a display device. The conventional touch display device comprises a plurality of touch electrodes, touch wires electrically connected with each touch electrode in a one-to-one correspondence manner, and a touch chip electrically connected with the touch wires, wherein the touch wires are used for transmitting touch scanning signals sent by the touch chip. However, as the size of the touch display device increases, the number of touch electrodes and touch traces corresponding to the touch electrodes increases, which results in more signal pins being required to be disposed in the touch chip, thereby increasing the cost of the touch display device.
In order to reduce the number of signal pins, a time-sharing driving mode is generally adopted to provide touch scanning signals for the touch electrodes. However, the time-sharing driving brings a problem of touch delay, which affects touch detection performance.
Disclosure of Invention
The embodiment of the invention provides a driving method and a driving circuit of a touch display panel and a touch display device, which are used for solving the problem of touch delay and realizing the effect of improving touch detection performance.
In a first aspect, an embodiment of the present invention provides a method for driving a touch display panel, where the touch display panel includes a plurality of Q touch groups sequentially arranged along a pixel row direction or a pixel column direction; the touch area group comprises N touch areas which are sequentially arranged along the arrangement direction of the touch area group; each touch area comprises M touch electrodes; the driving method comprises the following steps:
Applying first touch scanning signals to M touch electrodes of different touch areas in a time-sharing manner; wherein, M of the touch electrodes in each touch area apply a time overlap of a first touch scanning signal; and applying a time overlap of a first touch scanning signal to the M touch electrodes of the touch areas with the same sequence numbers of different touch groups;
determining a touch area according to touch detection signals fed back by the M touch electrodes of each touch area;
when the touch area is an L-th touch area, applying a first touch scanning signal to M touch electrodes of at least part of the N touch areas; wherein at least part of the touch area comprises the L-th touch area;
determining a touch position according to a touch detection signal fed back by the touch electrode of the L-th touch area;
wherein Q, L, M and N are positive integers greater than or equal to 1; l is less than or equal to N;
the time period of applying the first touch scanning signal to the M touch electrodes of different touch areas in a time-sharing mode is a first time period, and when the touch area is an L-th touch area, the time period of applying the first touch scanning signal to the M touch electrodes of at least part of the N touch areas is a second time period, wherein the second time period is smaller than the first time period.
In a second aspect, an embodiment of the present invention further provides a driving circuit, where the driving circuit is configured to drive a touch display panel; the touch display panel comprises a plurality of Q touch groups which are sequentially arranged along the pixel row direction or the pixel column direction; the touch area group comprises N touch areas which are sequentially arranged along the arrangement direction of the touch area group; each touch area comprises M touch electrodes;
the driving circuit includes: the touch driving circuit is used for applying first touch scanning signals to the M touch electrodes of different touch areas in a time-sharing mode and receiving touch detection signals fed back by the M touch electrodes of each touch area;
the touch driving circuit is further configured to apply a first touch scanning signal to M touch electrodes of at least some of the N touch areas when the touch area is an L-th touch area; receiving touch detection signals fed back by the M touch electrodes of at least part of the touch area; wherein at least part of the touch area comprises the L-th touch area;
wherein, M of the touch electrodes in each touch area apply a time overlap of a first touch scanning signal; and applying a time overlap of a first touch scanning signal to the M touch electrodes of the touch areas with the same sequence numbers of different touch groups; and Q, L, M and N are both positive integers greater than or equal to 1; l is less than or equal to N;
The time period of applying the first touch scanning signal to the M touch electrodes of different touch areas in a time-sharing mode is a first time period, and when the touch area is an L-th touch area, the time period of applying the first touch scanning signal to the M touch electrodes of at least part of the N touch areas is a second time period, wherein the second time period is smaller than the first time period.
In a third aspect, an embodiment of the present invention further provides a touch display device, where the touch display device includes a touch display panel and the driving circuit described in the second aspect.
According to the driving method, the driving circuit and the touch display device of the touch display panel, the touch display panel is divided into Q touch groups, each touch group comprises a plurality of touch areas, touch scanning signals are provided for touch electrodes of different touch areas in a time-sharing mode, and the number of signal pins is reduced; in addition, a first touch scanning signal is applied to the touch electrodes of different touch areas in a time sharing manner through a previous touch frame, scanning of all the touch electrodes in the touch display panel is completed, the first touch scanning signal is applied to the touch electrodes of the touch area at least comprising the touch area (the touch area determined by the previous touch frame) in the next touch frame based on the touch area determined by the previous touch frame, and the time for providing the first touch scanning signal to the touch area at least comprising the touch area is smaller than the time for applying the first touch scanning signal to the touch electrodes of the different touch areas in a time sharing manner, compared with the prior art, the time T3' is shortened, the problem of touch delay is improved, and the effect of improving the touch detection performance is realized; when the touch display panel is applied to a vehicle, the sensitivity of corresponding equipment is improved, and the use safety of the whole vehicle is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a touch display panel provided in the prior art;
FIG. 2 is a timing diagram of a touch display panel according to the prior art;
fig. 3 is a schematic structural diagram of a touch display panel according to an embodiment of the present invention;
fig. 4 is a flowchart of a driving method of a touch display panel according to an embodiment of the present invention;
fig. 5 is a timing chart of a touch display panel according to an embodiment of the invention;
fig. 6 is a timing chart of another touch display panel according to an embodiment of the invention;
fig. 7 is a timing diagram of another touch display panel according to an embodiment of the invention;
fig. 8 is a comparison diagram of a first touch scanning signal and a second touch scanning signal according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another touch display panel according to an embodiment of the invention;
fig. 10 is a timing diagram of another touch display panel according to an embodiment of the invention;
fig. 11 is a schematic view of a partial film structure of a touch display panel according to an embodiment of the present invention;
fig. 12 is a timing chart of another touch display panel according to an embodiment of the invention;
fig. 13 is a schematic structural diagram of another touch display panel according to an embodiment of the invention;
Fig. 14 is a timing diagram of another touch display panel according to an embodiment of the invention;
fig. 15 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention;
fig. 16 is a schematic diagram of a structure of a driving circuit according to another embodiment of the present invention;
fig. 17 is a schematic structural diagram of a touch display device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be fully described below by way of specific embodiments with reference to the accompanying drawings in the examples of the present invention. It is apparent that the described embodiments are some, but not all, embodiments of the present invention, and that all other embodiments, which a person of ordinary skill in the art would obtain without making inventive efforts, are within the scope of this invention.
Fig. 1 is a schematic structural diagram of a touch display panel in the prior art, as shown in fig. 1, a conventional touch display panel 100' includes a plurality of touch areas AA ', a touch driving circuit 10' and a plurality of touch electrodes 20' respectively disposed in the touch areas AA ', and the touch driving circuit 10' provides touch scanning signals to the touch electrodes 20' in different touch areas AA ' in a time-sharing manner through a touch trace 30 '. The plurality of touch areas AA ' include a first touch area AA1', a second touch area AA2', a third touch area AA3', and a fourth touch area AA4'. In one touch frame T0', scanning of all touch electrodes 20' in four touch areas AA 'of the touch display panel 100' is completed. Specifically, at the first moment, a touch scanning signal is provided to the plurality of touch electrodes 20 'in the first touch area AA 1'; at a second moment, providing touch scanning signals to the plurality of touch electrodes 20 'in the second touch area AA 2'; at a third moment, providing touch scanning signals to the plurality of touch electrodes 20 'in the third touch area AA 3'; at the fourth moment, a touch scanning signal is provided to the plurality of touch electrodes 20' in the fourth touch area AA4', and then a touch detection signal fed back by the touch electrodes 20' is received. Fig. 2 is a timing chart of a touch display panel in the prior art, as shown in fig. 2, when a finger touches the first touch area AA1' after completing scanning the touch electrode 20' in the first touch area AA1', that is, when touching the touch electrode 20' in the first touch area AA1', the touch driving circuit 10' cannot detect the touch, and the touch can be detected only by waiting for the second touch frame T0', and then the time T1' is missed, wherein T1' includes, for example, time of time-sharing scanning the touch electrode 20' in the second touch area AA2', the touch electrode 20' in the third touch area AA3', and the touch electrode 20' in the fourth touch area AA4'. After the scanning of all the touch electrodes 20' in the touch display panel 100' is completed in the second touch frame T0', the touch electrodes 20' of the first touch area AA1' are found only when the finger touches the touch electrodes, i.e. the time T2' is needed, and the time T2' is also the time of one touch frame T0', however, according to the principle of touch calculation accuracy, erroneous judgment caused by interference caused by jitter and the like is prevented, and T2' is discarded. Therefore, after the third touch frame T0 'completes scanning all the touch electrodes 20' in the touch display panel 100', touch position data is collected, and at this time, time T3' is needed, and time T3 'is also the time of one touch frame T0'. Then enter the phase T4', T4' is the data processing and touch position determining phase, T4' time is related to the operation speed of the touch chip. As can be seen from the above, the time required for completing the whole process of touch position determination is T1'+t2' +t3'+t4' =t1 '+2t0' +t4', i.e. the determination from the touch to the touch position is delayed by about T1' +2t0'+t4', which affects the touch detection performance. When the touch display panel is applied to a vehicle, the sensitivity of the operation of the equipment in the vehicle is deteriorated due to the too slow touch response, so that the use safety of the whole vehicle is affected.
Based on the technical problems, the touch display panel comprises a plurality of Q touch groups sequentially arranged along the pixel row direction or the pixel column direction; the touch control group comprises N touch control areas which are sequentially arranged along the arrangement direction of the touch control group; each touch area comprises M touch electrodes; the driving method comprises the following steps: applying first touch scanning signals to M touch electrodes in different touch areas in a time-sharing mode; wherein, M touch electrodes in each touch area apply the time overlapping of the first touch scanning signal; and applying a time overlap of the first touch scanning signal to M touch electrodes of the touch area with the same sequence number of different touch groups; determining a touch area according to touch detection signals fed back by M touch electrodes of each touch area; when the touch area is the L-th touch area, applying a first touch scanning signal to M touch electrodes of at least part of the N touch areas; wherein at least part of the touch areas comprise an L-th touch area; determining a touch position according to a touch detection signal fed back by a touch electrode of the L-th touch area; wherein Q, L, M and N are positive integers greater than or equal to 1; l is less than or equal to N; the time period of applying the first touch scanning signal to the M touch electrodes of different touch areas in a time-sharing mode is a first time period, and when the touch area is an L-th touch area, the time period of applying the first touch scanning signal to the M touch electrodes of at least part of the N touch areas is a second time period, wherein the second time period is smaller than the first time period.
By adopting the technical scheme, the touch display panel is divided into Q touch groups, each touch group comprises a plurality of touch areas, touch scanning signals are provided for touch electrodes in different touch areas in a time-sharing manner, and the number of signal pins is reduced; in addition, a first touch scanning signal is applied to the touch electrodes of different touch areas in a time sharing manner through a previous touch frame, scanning of all the touch electrodes in the touch display panel is completed, the first touch scanning signal is applied to the touch electrodes of the touch area at least comprising the touch area (the touch area determined by the previous touch frame) in the next touch frame based on the touch area determined by the previous touch frame, and the time for providing the first touch scanning signal to the touch area at least comprising the touch area is smaller than the time for applying the first touch scanning signal to the touch electrodes of the different touch areas in a time sharing manner, compared with the prior art, the time T3' is shortened, the problem of touch delay is improved, and the effect of improving the touch detection performance is realized; when the touch display panel is applied to a vehicle, the sensitivity of corresponding equipment is improved, and the use safety of the whole vehicle is further improved.
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. 3 is a schematic structural diagram of a touch display panel according to an embodiment of the present invention, and fig. 4 is a flowchart of a driving method of a touch display panel according to an embodiment of the present invention, where, as shown in fig. 3, the touch display panel 100 includes a plurality of Q touch groups AA0 sequentially arranged along a pixel row direction or a pixel column direction; the touch area group AA0 comprises N touch areas AA which are sequentially arranged along the arrangement direction of the touch area group; each touch area AA includes M touch electrodes (not shown).
As shown in fig. 4, the driving method of the touch display panel provided in the embodiment of the invention includes:
s110, applying first touch scanning signals to M touch electrodes in different touch areas in a time-sharing mode; wherein, M touch electrodes in each touch area apply the time overlapping of the first touch scanning signal; and applying a time overlap of the first touch scanning signal to M touch electrodes of the touch areas with the same sequence numbers of different touch groups.
Wherein, the time overlapping of the first touch scanning signals applied by all the touch electrodes in the same touch area AA. For example, with continued reference to fig. 3, the touch display panel 100 includes a plurality of 2 touch area groups AA0 sequentially arranged along the pixel row direction, and the 2 touch area groups AA0 include a first touch area group AA01 and a second touch area group AA02, respectively; the touch area group AA0 comprises 4 touch areas AA which are sequentially arranged along the pixel row direction along the touch area group, and the 4 touch areas AA respectively comprise a first touch area AA1, a second touch area AA2, a third touch area AA3 and a fourth touch area AA4; each touch area AA includes a plurality of touch electrodes (not shown); the time overlap of the first touch scan signal applied by all the touch electrodes in the first touch area AA1, the time overlap of the first touch scan signal applied by all the touch electrodes in the second touch area AA2, the time overlap of the first touch scan signal applied by all the touch electrodes in the third touch area AA3, and the time overlap of the first touch scan signal applied by all the touch electrodes in the fourth touch area AA 4.
The time overlapping of the first touch scanning signals is applied to M touch electrodes of the touch areas with the same sequence numbers and different touch groups. For example, the time when all the touch electrodes in the first touch area AA1 in the first touch area AA01 apply the first touch scan signal and the time when all the touch electrodes in the first touch area AA1 in the second touch area AA02 apply the first touch scan signal overlap, … …, the time when all the touch electrodes in the fourth touch area AA4 in the first touch area AA01 apply the first touch scan signal and the time when all the touch electrodes in the fourth touch area AA4 in the second touch area AA02 apply the first touch scan signal overlap.
Specifically, at a first moment, providing a first touch scanning signal to a plurality of touch electrodes in a first touch area AA1 in a first touch area AA01 and a second touch area AA 02; at a second moment, providing a first touch scanning signal to a plurality of touch electrodes in a second touch area AA2 in the first touch area group AA01 and the second touch area group AA 02; at a third moment, providing a first touch scanning signal to a plurality of touch electrodes in a third touch area AA3 in the first touch area group AA01 and the second touch area group AA 02; at the fourth moment, a first touch scanning signal is provided to a plurality of touch electrodes in a fourth touch area AA4 in the first touch area group AA01 and the second touch area group AA02, so that scanning of all touch electrodes in the touch display panel 100 is completed.
Optionally, the time for applying the first touch scanning signal by the M touch electrodes in each touch area is the same; and the time for applying the first touch scanning signal to M touch electrodes of the touch areas with the same sequence numbers and different touch groups is the same. The arrangement has the advantages that the touch detection precision is improved; and the same control signal can control the touch driving circuit to simultaneously provide the first touch scanning signal to all touch electrodes in the touch areas with the same sequence number and different touch groups, so that wiring is reduced, process steps are simplified, and the preparation efficiency of the touch display panel is improved.
S120, determining the touch area according to the touch detection signals fed back by the M touch electrodes of each touch area.
In the embodiment, the touch electrode in the touch display panel 100 may be a self-capacitance touch electrode or a mutual-capacitance touch electrode, which is not limited herein, and may be set by a person skilled in the art according to practical situations. If the touch electrode is a self-capacitance touch electrode, the working process is as follows: each touch electrode corresponds to a defined coordinate position, and the touch electrodes respectively form a capacitor with the ground. When a finger touches the touch display panel, the capacitance of the finger is superimposed on the touch electrode touched by the finger, so that the capacitance to ground of the touch electrode touched by the finger is changed. Because the change of the signals of the touch electrodes reflects the change of the capacitance of the touch electrodes to the ground, the specific touch electrode signal is determined by detecting the touch detection signals fed back by the M touch electrodes in each touch area, and then the touch position of the finger and the touch area of the touch can be determined according to the coordinate value corresponding to the touch electrode with the changed signal. If the touch electrode is a mutual capacitance type touch electrode, the working process is as follows: the mutual capacitance type touch electrode comprises a touch driving electrode and a touch detection electrode, wherein projections between the touch driving electrode and the touch detection electrode are overlapped, and a capacitor is formed at the crossing position of the two groups of electrodes. When a finger touches the touch display panel, the coupling between the two electrodes near the touch point is affected, thereby changing the capacitance between the two electrodes. When the mutual capacitance is detected, excitation signals are sequentially sent to the touch control driving electrodes, and all the touch control detection electrodes simultaneously receive signals, so that the capacitance value of the junction of all the touch control driving electrodes and the touch control detection electrodes, namely the capacitance of the two-dimensional plane of the whole touch control display panel, can be obtained. According to the two-dimensional capacitance variation data of the touch display panel, coordinate values of each touch point can be calculated, and further the touch position of the finger and the touch area of the touch are determined. In this case, the touch area and the touch position are found for the first time, however, in order to avoid erroneous judgment caused by interference caused by jitter, a time period used for applying the first touch scanning signal to the M touch electrodes of the different touch areas AA in a time-sharing manner is lost, but the time period may be used as a reference for determining the touch position by applying the first touch scanning signal to the M touch electrodes of the different touch areas AA in the next touch frame, that is, after the touch area and the touch position are found for the first time, and when the touch occurs in the touch area and the touch position in the next touch frame, the touch position may be determined based on the two results.
Optionally, when the touch electrode is a mutual capacitive touch electrode, the touch driving electrode and the touch detecting electrode in the mutual capacitive touch electrode may be arranged in the same layer in an insulating manner, or may be located in different film layers. The present embodiment is not particularly limited.
S130, when the touch area is an L-th touch area, applying a first touch scanning signal to M touch electrodes of at least part of the N touch areas; wherein at least part of the touch areas comprise an L-th touch area; the time period of applying the first touch scanning signal to the M touch electrodes of different touch areas in a time-sharing mode is a first time period, and when the touch area is an L-th touch area, the time period of applying the first touch scanning signal to the M touch electrodes of at least part of the N touch areas is a second time period, wherein the second time period is smaller than the first time period.
In the above steps (S110 and S120), it can be known that the first touch scanning signal is applied to the M touch electrodes of the different touch areas AA in a time-sharing manner to determine the touch area and the touch position for the first time. Although this period is lost, it may be used as a reference for applying the first touch scan signal to the M touch electrodes of the different touch areas AA in the next touch frame to determine the touch position. Specifically, when the touch area is determined to be the L-th touch area through the above steps, the first touch scanning signal is applied to the M touch electrodes of at least part of the touch area including the L-th touch area, and the time for respectively providing the first touch scanning to the touch areas including at least the L-th touch area is less than the time for time-sharing application of the first touch scanning signal to the touch electrodes of different touch areas, compared with the prior art, the time of T3' is shortened, and the time required for completing the whole process of determining the touch position is further reduced, so that the problem of touch delay is improved, and the effect of improving the touch detection performance is realized. The following embodiments describe in detail how to realize a specific method of providing a first touch scan to a touch area including at least an L-th touch area respectively with a time shorter than a time of applying a first touch scan signal to touch electrodes of different touch areas in a time-sharing manner, and are not described in detail herein.
S140, determining a touch position according to a touch detection signal fed back by a touch electrode of the L-th touch area; wherein Q, L, M and N are positive integers greater than or equal to 1; l is less than or equal to N.
Because the touch detection signals fed back at this time are only some changes and differences of capacitance, some processing and operation are needed at this time, namely, data processing and operation are performed on the touch detection signals fed back by the touch electrode of the L-th touch area, so that the touch position is determined.
In practical applications, there are various ways to make the second time period smaller than the first time period. The following describes typical examples in detail. None of the following is intended to limit the invention.
Optionally, when the touch area is the L-th touch area, applying the first touch scan signal to M touch electrodes of at least some of the N touch areas includes: when the touch area is the L-th touch area, only the first touch scanning signals applied to the M touch electrodes of the L-th touch area are applied.
For example, fig. 5 is a timing chart of another touch display panel provided by the embodiment of the present invention, referring to fig. 3 and 5, when a finger touches the first touch area AA1, after the touch electrode in the first touch area AA1 is scanned, that is, when the touch electrode in the first touch area AA1 is touched, the touch driving circuit cannot detect the touch, and the touch driving circuit needs to wait until the second touch frame T0 to detect the touch, and then misses the time T1, where T1 includes, for example, time for time-sharing scanning the touch electrode in the second touch area AA2, the touch electrode in the third touch area AA3, and the touch electrode in the fourth touch area AA 4. After scanning all the touch electrodes in the touch display panel 100 in the second touch frame T0, the finger touching the first touch area AA1 (the L-th touch area) is found, i.e. the time T2 is needed, and the time T2 is also the time of one touch frame T0, however, according to the principle of touch calculation accuracy, T2 is discarded. In the third touch frame T0, only the first touch scan signals applied to the M touch electrodes of the first touch area AA1 are used, and after the scanning of all the touch electrodes of the first touch area AA1 is completed, touch position data are collected, and at this time, the first touch scan signals do not need to be applied to the M touch electrodes of the second touch area AA2, the M touch electrodes of the third touch area AA3 and the M touch electrodes of the fourth touch area AA4, so that compared with the prior art, in the third touch frame T0, all the touch electrodes 20 in the touch display panel 100 need to be scanned, and the time of T3' is reduced. Then, a phase T4 is entered, wherein the phase T4 is a data processing and touch position determining phase, and the time of the phase T4 is related to the operation speed of the touch chip. As can be seen from the above, the time required for completing the whole process of determining the touch position is t1+t2+t3+t4=t1+t0+t3+t4, where T1 is the same as T1 'in the prior art, T0 is the same as T0' in the prior art, T4 is the same as T4 'in the prior art, and T3 is less than T0 compared with the time required for completing the whole process of determining the touch position in the prior art, T1' +2t0'+t4', which improves the problem of touch delay and achieves the effect of improving the touch detection performance because the M touch electrodes of the second touch area AA2, the M touch electrodes of the third touch area AA3, and the M touch electrodes of the fourth touch area AA4 are not required; when the touch display panel is applied to a vehicle, the sensitivity of corresponding equipment is improved, and the use safety of the whole vehicle is further improved.
Optionally, when the touch area is the L-th touch area, applying the first touch scan signal to M touch electrodes of at least some of the N touch areas includes: when the touch area is the L-th touch area, applying a first touch scanning signal to M touch electrodes of partial touch areas in the N touch areas; the partial touch area includes an L-th touch area.
For example, fig. 6 is a timing chart of another touch display panel provided in the embodiment of the present invention, referring to fig. 3 and 6, when a finger touches the first touch area AA1, after the touch electrode in the first touch area AA1 is scanned, that is, when the touch electrode in the first touch area AA1 is touched, the touch driving circuit cannot detect the touch, and the touch driving circuit needs to wait until the second touch frame T0 to detect the touch, and then misses the time T1, where T1 includes, for example, time for time-sharing scanning the touch electrode in the second touch area AA2, the touch electrode in the third touch area AA3, and the touch electrode in the fourth touch area AA 4. After scanning all the touch electrodes in the touch display panel 100 in the second touch frame T0, the finger touching the first touch area AA1 (the L-th touch area) is found, i.e. the time T2 is needed, and the time T2 is also the time of one touch frame T0, however, according to the principle of touch calculation accuracy, T2 is discarded. In the third touch frame T0, the first touch scan signal is applied to the M touch electrodes of the first touch area AA1 and the first touch scan signal is applied to the M touch electrodes of the second touch area AA2 in a time-sharing manner, after scanning of all the touch electrodes of the first touch area AA1 and the second touch area AA2 is completed, touch position data is acquired, and since the third touch area AA3 and the fourth touch area AA4 are not touched, the first touch scan signal is not required to be provided to the touch electrodes in the third touch area AA3 and the fourth touch area AA4 at this time, so compared with the prior art, the time for acquiring touch position data after scanning of all the touch electrodes 20 in the touch display panel 100 is completed in the third touch frame T0 is reduced. And then entering a T4 stage, wherein the T4 stage is a data processing and touch position determining stage. As can be seen from the above, the time required for completing the whole process of determining the touch position is t1+t2+t3+t4=t1+t0+t3+t4, where T1 is the same as T1 'in the prior art, T0 is the same as T0' in the prior art, T4 is the same as T4 'in the prior art, and T3 is less than T0 because it is not necessary to provide the first touch scanning signal to the touch electrodes in the third touch area AA3 and the fourth touch area AA4, compared with the time required for completing the whole process of determining the touch position in the prior art, t1' +2t0'+t4', the problem of touch delay is improved, and the effect of improving the touch detection efficiency is achieved; when the touch display panel is applied to a vehicle, the sensitivity of corresponding equipment is improved, and the use safety of the whole vehicle is further improved.
It should be noted that, in fig. 6, the first touch scan signal is applied to the M touch electrodes of the first touch area AA1 and the first touch scan signal is applied to the M touch electrodes of the second touch area AA2 only in the third touch frame T0 in a time-sharing manner for explanation, but the present application is not limited thereto, and those skilled in the art can set the same according to practical situations. In other alternative embodiments, the first touch scan signal may be applied to the M touch electrodes of the first touch area AA1 and the first touch scan signal may be applied to the M touch electrodes of the third touch area AA3 in a time-sharing manner; or, applying the first touch scanning signals to the M touch electrodes of the first touch area AA1 in a time-sharing manner and applying the first touch scanning signals to the M touch electrodes of the fourth touch area AA4 in a time-sharing manner; or, applying the first touch scanning signals to the M touch electrodes of the first touch area AA1, applying the first touch scanning signals to the M touch electrodes of the second touch area AA2 and applying the first touch scanning signals to the M touch electrodes of the third touch area AA3 in a time-sharing manner; or, applying the first touch scanning signals to the M touch electrodes of the first touch area AA1, applying the first touch scanning signals to the M touch electrodes of the second touch area AA2 and applying the first touch scanning signals to the M touch electrodes of the fourth touch area AA4 in a time-sharing manner; or, the first touch scanning signals applied to the M touch electrodes of the first touch area AA1, the first touch scanning signals applied to the M touch electrodes of the third touch area AA3, and the first touch scanning signals applied to the M touch electrodes of the fourth touch area AA4 in a time-sharing manner. The time sequence of the first touch scanning signals applied to the M touch electrodes of each touch area AA is not limited.
Optionally, when the touch area is the L-th touch area, applying a first touch scanning signal to M touch electrodes of at least part of the N touch areas, including: when the touch area is an L-th touch area, applying first touch scanning signals to M touch electrodes of the L-th touch area and applying second touch scanning signals to other touch areas except the L-th touch area in a time-sharing manner; the duration of applying the second touch scanning signal is less than the duration of applying the first touch scanning signal.
When the touch area AA is the L-th touch area, a first touch scanning signal is applied to M touch electrodes of the L-th touch area in each touch area group AA0, and a second touch scanning signal is applied to other touch areas AA in each touch area group AA0 except the L-th touch area, so as to determine whether a new touch point exists. Because the detection precision of other touch areas AA is not required to be very high, the time for applying the second touch scanning signal is set to be shorter than the time for applying the first touch scanning signal, so that the problem of touch delay can be solved, meanwhile, the situation of missing multi-point touch which possibly occurs can be avoided, and the touch detection precision is improved.
For example, fig. 7 is a timing chart of another touch display panel provided by the embodiment of the present invention, referring to fig. 3 and 7, when a finger touches the first touch area AA1, after the touch electrode in the first touch area AA1 is scanned, that is, when the touch electrode in the first touch area AA1 is touched, the touch driving circuit cannot detect the touch, and the touch driving circuit needs to wait until the second touch frame T0 to detect the touch, and then the time T1 is missed, where T1 includes, for example, time for time-sharing scanning the touch electrode in the second touch area AA2, the touch electrode in the third touch area AA3, and the touch electrode in the fourth touch area AA 4. After scanning all the touch electrodes in the touch display panel 100 in the second touch frame T0, the finger touching the first touch area AA1 (the L-th touch area) is found, i.e. the time T2 is needed, and the time T2 is also the time of one touch frame T0, however, according to the principle of touch calculation accuracy, T2 is discarded. In the third touch frame T0, first touch scan signals are applied to the M touch electrodes of the first touch area AA1 to complete the scanning of all the touch electrodes of the first touch area AA1, so as to avoid the situation that multi-touch may occur due to missing, in this embodiment, second touch scan signals are also applied to the touch electrodes of the other touch areas AA (the second touch area AA2, the third touch area AA3 and the fourth touch area AA 4) except the first touch area AA1 in a time-sharing manner, and since the detection accuracy at this time is not required to be very high, the duration of the second touch scan signals applied may be shorter than the duration of the first touch scan signals applied, for example, fig. 8 is a comparison chart of the first touch scan signals and the second touch scan signals provided in the embodiment of the present invention, and as shown in fig. 8, the duration of the second touch scan signals S2 is half the duration of the first touch scan signals S1. It is understood that the duration of applying the second touch scan signal S2 and the duration of applying the first touch scan signal S1 may be set by those skilled in the art according to practical situations. Then, the touch position data is collected, and compared with the prior art, the time of applying the first touch scanning signal to all the touch electrodes 20 in the touch display panel 100 in the third touch frame T0 is reduced by T3'. Then enter the T4 stage, T4 stage is data handling and touch position determining stage, T4 time and operation speed of the touch chip are related. As can be seen from the above, the time required for completing the whole process of determining the touch position is t1+t2+t3+t4=t1+t0+t3+t4, where T1 is the same as T1 'in the prior art, T0 is the same as T0' in the prior art, T4 is the same as T4 'in the prior art, and the duration of the second touch scanning signal applied in T3 may be smaller than the duration of the first touch scanning signal applied, so T3 is smaller than T0, compared with the time required for completing the whole process of determining the touch position in the prior art, t1' +2t0'+t4', which improves the problem of touch delay and achieves the effect of improving the touch detection efficiency; when the touch display panel is applied to a vehicle, the sensitivity of corresponding equipment is improved, and the use safety of the whole vehicle is further improved.
According to the above, the first touch scanning signal is applied to the touch electrodes of different touch areas in a time-sharing manner through the previous touch frame, so that scanning of all the touch electrodes in the touch display panel is completed, the first touch scanning signal is applied to the touch electrodes of the touch area at least comprising the touch area (the touch area determined by the previous touch frame) in the next touch frame based on the touch area determined by the previous touch frame, and the time for providing the first touch scanning signal to the touch electrodes of the touch area at least comprising the touch area is smaller than the time for applying the first touch scanning signal to the touch electrodes of different touch areas in a time-sharing manner; when the touch display panel is applied to a vehicle, the sensitivity of corresponding equipment is improved, and the use safety of the whole vehicle is further improved.
The display panel in the above embodiment may be a liquid crystal display panel or an organic light emitting display panel. In order to reduce the cost and simplify the process, the structure in the display panel is multiplexed into the touch electrode in this embodiment, for example, when the display panel is a liquid crystal display panel, the common electrode of the liquid crystal display panel is multiplexed into the touch electrode; when the display panel is an organic light-emitting display panel, multiplexing a cathode of the organic light-emitting display panel as a touch electrode; meanwhile, the touch chip and the display chip are integrated into the same chip, and the chip provides a common (cathode) voltage signal and a touch scanning signal for the common electrode (or cathode) in a time-sharing manner in a display driving stage and a touch driving stage. The display and touch time-sharing driving will be described in detail below.
Optionally, fig. 9 is a schematic structural diagram of another touch display panel provided by the embodiment of the present invention, fig. 10 is a timing chart of another touch display panel provided by the embodiment of the present invention, fig. 11 is a schematic structural diagram of a portion of a film layer of a touch display panel provided by the embodiment of the present invention, as shown in fig. 9, the touch display panel 100 includes at least one display area VA sequentially arranged along a pixel column direction, a plurality of rows of sub-pixels 40 are disposed in the display area VA, and fig. 9 only illustrates that the touch display panel 100 includes one display area VA as an example; as shown in fig. 10, each image frame includes at least one display driving stage P and a plurality of touch driving stages C; each image frame comprises K touch frames, wherein K is a positive integer greater than or equal to 1, and each touch frame comprises a plurality of touch driving stages C; fig. 10 only exemplifies that each image frame includes 1 touch frame, and that 1 touch frame includes 4 touch driving phases C; as shown in fig. 11, the touch display panel 100 includes a liquid crystal touch display panel, which includes an array substrate 110, a color film substrate 120, and a liquid crystal layer 130 disposed between the array substrate 110 and the color film substrate 120; the array substrate 110 includes a first metal layer M1, a second metal layer M2, a third metal layer M3, and an insulating layer disposed between the metal layers, and the array substrate 110 includes a plurality of thin film transistors 50; the first metal layer M1 includes a gate electrode of the thin film transistor 50, a scanning line, and the like (not shown in the drawing); the second metal layer M2 includes a source electrode 53, a drain electrode 54, a data line, and the like (not shown) of the thin film transistor 50; the third metal layer M3 includes a touch trace 30; the array substrate 110 further includes a common electrode block 70 and a pixel electrode 60, where the common electrode block 70 is electrically connected to the touch trace 30; wherein the common electrode 70 is multiplexed as the touch electrode 20; applying first touch scanning signals to M touch electrodes in different touch areas AA in a time sharing mode comprises the following steps: applying first touch scanning signals to M touch electrodes of N touch areas AA in a one-to-one corresponding time sharing mode in a plurality of touch driving stages C of each touch frame; the driving method further includes: in the display driving stage P, the subpixels 40 in the display area VA are display-driven.
Specifically, when the common electrode 70 is multiplexed into the touch electrode 20, touch and display time-sharing driving is required, that is, first touch scanning signals are applied to the M touch electrodes of the N touch areas AA in a time-sharing manner corresponding to the multiple touch driving phases C of each touch frame, that is, the signals received by the common electrode 70 are the first touch scanning signals; in the display driving stage P, the sub-pixels 40 in the display area VA are display-driven, that is, at this time, the signal received by the common electrode 70 is a common voltage signal. In this embodiment, a common electrode (cathode) of the display panel is multiplexed as a touch electrode; meanwhile, the touch chip and the display chip are integrated into the same chip, and the chip provides a common (cathode) voltage signal and a touch scanning signal for a common electrode (or a cathode) in a time-sharing manner in a display driving stage and a touch driving stage, so that the cost of the display panel is reduced.
It should be noted that fig. 11 only takes the thin film transistor 50 in the touch display panel as the bottom gate thin film transistor as an example, but the application is not limited thereto, and in other alternative embodiments, the thin film transistor 50 may be a top gate thin film transistor. In addition, in fig. 11, the electrical connection between the common electrode block 70 and the touch trace 30 is connected by a cross line, but the present application is not limited thereto, and one skilled in the art may set the electrical connection according to the actual situation of the product.
It should be further noted that the liquid crystal touch display panel provided in this embodiment may be applied to liquid crystal touch display panels of TN type, FFS type, IPS type, and the like. In fig. 11, only the touch display panel is taken as a liquid crystal touch display panel, and the common electrode 70 is located below the film layer where the pixel electrode 60 is located, but the application is not limited thereto, and one skilled in the art can select the type of the touch display panel and set the specific structure and connection relationship of the touch display panel according to the actual situation. It should be further noted that fig. 10 only illustrates an example in which one image frame includes one touch frame. In other alternative embodiments, one image frame may further include a plurality of touch frames, for example, referring to fig. 12, one image frame includes two touch frames, so that the response speed of touch detection may be improved.
Optionally, fig. 13 is a schematic structural diagram of another touch display panel according to an embodiment of the present application, and fig. 14 is a timing chart of another touch display panel according to an embodiment of the present application, as shown in fig. 13, the touch display panel 100 includes a plurality of display areas VA sequentially arranged along a pixel column direction, each display area VA includes a plurality of rows of sub-pixel rows, where the number of sub-pixel rows included in each display area VA may be the same or different; as shown in fig. 14, each image frame includes a plurality of display driving phases P; the display driving stage P and the touch driving stage C are arranged at intervals; in the display driving stage P, performing display driving on the sub-pixels in the display area, including: the display driving is performed on the sub-pixels in the plurality of display areas in a one-to-one correspondence in a plurality of display driving phases of each image frame.
In this embodiment, the display driving phases P and the touch driving phases C are arranged at intervals, and in each display driving phase P, a plurality of rows of sub-pixels in the display area VA are subjected to time-sharing display driving; in each touch driving stage C, a first touch scanning signal is applied to M touch electrodes of a touch area at the same time. The display driving stage is inserted into the touch driving stage C, so that the display uniformity of the display panel can be improved.
Optionally, with continued reference to fig. 14, the duration of each touch driving stage is the same, and the duration of each display driving stage is the same. That is, the duration of the display driving phase between two adjacent touch driving phases is the same, so that the display uniformity of the display panel can be further improved.
It should be noted that fig. 14 illustrates an example in which only one image frame includes two touch frames, but the present application is not limited thereto.
Optionally, with continued reference to fig. 10, each image frame further includes at least one Noise detection stage Noise; the driving method further includes: noise detection is carried out through a noise detection stage so as to obtain a touch detection noise signal; determining a touch position according to a touch detection signal fed back by a touch electrode of the L-th touch area comprises: and determining the touch position according to the touch detection signal fed back by the touch electrode of the L-th touch area and the touch detection noise signal.
In this embodiment, by performing noise detection in the noise detection stage, and then determining the touch position according to the obtained touch detection noise signal and the touch detection signal, the influence of the background noise on the touch detection signal is avoided, and the accuracy of touch position detection is improved.
Optionally, with continued reference to fig. 14, each touch detection frame includes a Noise detection phase Noise. The accuracy of touch position detection can be further improved by performing noise detection in each touch frame.
Based on the same inventive concept, the embodiment of the invention also provides a driving circuit. The driving circuit provided by the embodiment of the invention is used for driving the touch display panel of the embodiment; the touch display panel comprises a plurality of Q touch groups which are sequentially arranged along the pixel row direction or the pixel column direction; the touch area group comprises N touch areas which are sequentially arranged along the arrangement direction of the touch area group; each touch area comprises M touch electrodes. Fig. 15 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention, as shown in fig. 15, the driving circuit according to an embodiment of the present invention includes a touch driving circuit 200, which is configured to apply a first touch scanning signal to M touch electrodes 20 of different touch areas AA in a time-sharing manner, and receive touch detection signals fed back by the M touch electrodes 20 of each touch area AA to determine the touch area; the touch driving circuit 200 is further configured to apply a first touch scanning signal to M touch electrodes of at least a portion of the N touch areas when the touch area AA is the L-th touch area; and receiving a touch detection signal fed back by a touch electrode of the L-th touch area to determine a touch position; wherein at least part of the N touch areas comprise an L-th touch area; wherein, the time overlapping of the first touch scanning signals applied by the M touch electrodes in each touch area; and applying a time overlap of the first touch scanning signal to M touch electrodes of the touch area with the same sequence number of different touch groups; and Q, L, M and N are both positive integers greater than or equal to 1; l is less than or equal to N; the time period of applying the first touch scanning signal to the M touch electrodes of different touch areas in a time-sharing mode is a first time period, and when the touch area is an L-th touch area, the time period of applying the first touch scanning signal to the M touch electrodes of at least part of N touch areas is a second time period, wherein the second time period is smaller than the first time period.
The touch display panel includes a plurality of 1 touch area groups AA0 sequentially arranged along the pixel row direction; the touch area group AA0 comprises 4 touch areas AA which are sequentially arranged along the pixel row direction along the touch area group, and the 4 touch areas AA respectively comprise a first touch area AA1, a second touch area AA2, a third touch area AA3 and a fourth touch area AA4; each touch area AA includes a plurality of touch electrodes (not shown); at a first moment, providing a first touch scanning signal to a plurality of touch electrodes in a first touch area AA 1; providing a first touch scanning signal to a plurality of touch electrodes in the second touch area AA2 at a second moment; at a third moment, providing a first touch scanning signal to a plurality of touch electrodes in a third touch area AA 3; at the fourth moment, the first touch scanning signals are provided to the plurality of touch electrodes in the fourth touch area AA4, so as to complete scanning of all the touch electrodes in the touch display panel 100. At this time, the touch detection signal fed back by the touch electrode is only a few changes and differences of capacitance, so that only the touch position and the touch area of the touch can be determined approximately at this time. Then, when it is determined that the touch area is the first touch area AA1 based on this, a first touch scan signal is applied to M touch electrodes including at least a portion of the touch area of the first touch area AA1, and a time for providing the first touch scan to each of the touch areas including at least the L-th touch area is less than a time for applying the first touch scan signal to the touch electrodes of the different touch areas in a time-sharing manner. Compared with the prior art, the time of T3' is shortened, so that the time required for completing the whole process of determining the touch position is reduced, the problem of touch delay is solved, and the effect of improving the touch detection efficiency is realized.
Optionally, with continued reference to fig. 15, the touch driving circuit 200 includes m×q gate circuits 210, i.e., the number of gate circuits 210 may be the same as, for example, the product of the number of touch electrodes 20 in each touch area AA and the number of touch area groups AA 0; each of the gate circuits 210 includes N switch units 211, that is, the number of switch units 211 in each of the gate circuits 210 corresponds to the number of touch areas AA one by one, and first ends of the N switch units 211 are electrically connected, so that a first touch scan signal can be input at the same time; the second end of the ith switching unit 211 in each gating circuit 210 is electrically connected to the touch electrode 20 of the ith touch area AA; the jth touch electrode 20 of each touch area AA is electrically connected to the jth gate circuit 210; wherein i is less than or equal to N, j is less than or equal to M; the switch units 211 with the same sequence number in the different gating circuits 210 are sequentially turned on to apply the first touch scanning signals to the M touch electrodes 20 in the different touch areas AA in a time-sharing manner; when the touch area AA is the L-th touch area, the switch units 211 with at least part of the same sequence numbers in the different gating circuits 210 are sequentially turned on to apply the first touch scanning signals to the M touch electrodes 20 of at least part of the N touch areas AA in a time-sharing manner; at least part of the touch area AA includes an L-th touch area.
The switching unit 211 may include, for example, a transistor or a MOS transistor, which may implement an off and on function.
Wherein a control terminal of each switching unit 211 is electrically connected to the gate control line SW, and a gate control signal transmitted through the gate control line SW controls on or off of the switching unit 211. For example, the control terminals of the switch units 211 with the same sequence number in the different gate circuits 210 may be electrically connected to the same gate control line SW, and the same gate control signal may be transmitted to control the on or off of the switch units 211 with the same sequence number in the different gate circuits 210 at the same time, so that the wiring may be reduced and the process steps may be simplified.
For example, the touch display panel 100 includes 1 touch area group AA0, where the touch area group AA0 includes 4 touch areas AA sequentially arranged along the pixel row direction along the touch area group, and the 4 touch areas AA include a first touch area AA1, a second touch area AA2, a third touch area AA3, and a fourth touch area AA4, respectively; each touch area AA includes 4 touch electrodes 20; the touch driving circuit 200 includes 4 gate circuits 210; each of the gate circuits 210 includes 4 switching units 211,4 switching units 211 including a first switching unit 2111, a second switching unit 2112, a third switching unit 2113, and a fourth switching unit 2114, respectively; the gate control lines SW include first, second, third, and fourth gate control lines SW1, SW2, SW3, and SW4, respectively, wherein the first gate control lines SW1 are electrically connected to the first switching units 2111 of the 4 gate circuits 210, the second gate control lines SW2 are electrically connected to the second switching units 2112 of the 4 gate circuits 210, the third gate control lines SW3 are electrically connected to the third switching units 2113 of the 4 gate circuits 210, and the fourth gate control lines SW4 are electrically connected to the fourth switching units 2114 of the 4 gate circuits 210, respectively; it can be understood that, in actual setting, the number of touch area groups AA0 in the touch display panel is not limited to 1, the total number of touch areas AA (the sum of touch areas AA included in each touch area group AA 0) is also much greater than 4, the number of touch electrodes 20 in each touch area AA is also much greater than 4, the number of gate circuits 210 is also much greater than 4, and the number of switch units 211 in the gate circuits 210 is also not limited to 4, and the embodiment does not limit the number of touch area groups AA0, touch areas AA, touch electrodes 20 in the touch area AA, gate circuits 210, and switch units 211 in the gate circuits 210. Specifically, at the first moment, the first gate control line SW1 outputs an active level, and the first switching units 2111 in the 4 gate circuits 210 are turned on to transmit the first touch scan signals transmitted by the first input terminal in1, the second input terminal in2, the third input terminal in3, and the fourth input terminal in4 to the plurality of touch electrodes 20 in the first touch area AA 1; at a second moment, the second gate control line SW2 outputs an active level, and the second switching units 2112 in the 4 gate circuits 210 are turned on to transmit the first touch scan signals transmitted from the first input terminal in1, the second input terminal in2, the third input terminal in3 and the fourth input terminal in4 to the plurality of touch electrodes 20 in the second touch area AA 2; at a third time, the third gate control line SW3 outputs an active level, and the third switching units 2113 of the 4 gate circuits 210 are turned on to transmit the first touch scan signals transmitted from the first input terminal in1, the second input terminal in2, the third input terminal in3, and the fourth input terminal in4 to the plurality of touch electrodes 20 in the third touch area AA 3; at the fourth moment, the fourth gate control line SW4 outputs an active level, and the fourth switch unit 2114 in the 4 gate circuits 210 is turned on to transmit the first touch scan signals transmitted by the first input terminal in1, the second input terminal in2, the third input terminal in3 and the fourth input terminal in4 to the plurality of touch electrodes 20 in the fourth touch area AA4, so as to complete scanning of all the touch electrodes 20 in the touch display panel. Then, the touch area and the touch position are roughly determined according to the touch detection signals fed back by the 4 touch electrodes 20 of each touch area AA. In order to avoid erroneous judgment caused by interference caused by jitter, the time period for applying the first touch scanning signal to the 4 touch electrodes 20 of the different touch areas AA is lost, but the time period may be used as a reference for determining the touch position by applying the first touch scanning signal to the 4 touch electrodes of the 4 touch areas AA in the next touch frame, that is, after the touch area and the touch position are found for the first time, and the touch position is determined to occur in the touch area and the touch position in the next touch frame, and the touch position may be determined based on the two results. Specifically, when the touch area is determined to be the first touch area AA1, applying a first touch scan signal to the 4 touch electrodes including at least a portion of the touch area of the first touch area AA1, for example, in a next touch frame, applying the first touch scan signal to only the 4 touch electrodes of at least a portion of the touch area of the first touch area AA1, specifically, the first gate control line SW1 outputs an active level, and the first switching unit 2111 in the 4 gate circuits 210 is turned on to transmit the first touch scan signal transmitted by the first input terminal in1, the second input terminal in2, the third input terminal in3, and the fourth input terminal in4 to the plurality of touch electrodes 20 in the first touch area AA 1; at this time, the time of transmitting the first touch scan to the touch electrode 20 of the first touch area AA1 is less than the time of applying the first touch scan signal to the touch electrode 20 of the different touch area AA in a time-sharing manner. Finally, the touch detection signals fed back by the 4 touch electrodes 20 of the first touch area AA1 are processed and operated to determine the touch position. Compared with the prior art, the time of T3' is shortened, so that the time required for completing the whole process of determining the touch position is reduced, the problem of touch delay is solved, and the effect of improving the touch detection efficiency is realized.
It should be noted that, in the above example of determining the touch position, taking the example of applying the first touch scan signal to only the 4 touch electrodes 20 of the first touch area AA1, but not limiting the present application, in other alternative embodiments, the first touch scan signal applied to the 4 touch electrodes 20 of the first touch area AA1 and the first touch scan signal applied to the 4 touch electrodes of the second touch area AA2 may be time-shared, specifically, at the first moment, the first gate control line SW1 outputs an active level, and the first switch unit 2111 in the 4 gate circuits 210 is turned on to transmit the first touch scan signal transmitted by the first input terminal in1, the second input terminal in2, the third input terminal in3, and the fourth input terminal in4 to the plurality of touch electrodes 20 in the first touch area AA 1; at the second moment, the second gate control line SW2 outputs an active level, and the first switching unit 2111 of the 4 gate circuits 210 is turned on to transmit the first touch scan signals transmitted from the first input terminal in1, the second input terminal in2, the third input terminal in3 and the fourth input terminal in4 to the plurality of touch electrodes 20 in the first touch area AA 1. Or, the first touch scanning signals applied to the 4 touch electrodes of the first touch area AA1 and the first touch scanning signals applied to the 4 touch electrodes of the fourth touch area AA4 in a time-sharing manner; specifically, at the first moment, the first gate control line SW1 outputs an active level, and the first switching units 2111 in the 4 gate circuits 210 are turned on to transmit the first touch scan signals transmitted by the first input terminal in1, the second input terminal in2, the third input terminal in3, and the fourth input terminal in4 to the plurality of touch electrodes 20 in the first touch area AA 1; at the second moment, the fourth gate control line SW4 outputs an active level, and the fourth switch unit 2114 in the 4 gate circuits 210 is turned on to transmit the first touch scan signals transmitted from the first input terminal in1, the second input terminal in2, the third input terminal in3, and the fourth input terminal in4 to the plurality of touch electrodes 20 in the fourth touch area AA 4. Or, the first touch scanning signals applied to the M touch electrodes of the first touch area AA1, the first touch scanning signals applied to the M touch electrodes of the second touch area AA2, and the first touch scanning signals applied to the M touch electrodes of the third touch area AA3 in a time-sharing manner; specifically, at the first moment, the first gate control line SW1 outputs an active level, and the first switching units 2111 in the 4 gate circuits 210 are turned on to transmit the first touch scan signals transmitted by the first input terminal in1, the second input terminal in2, the third input terminal in3, and the fourth input terminal in4 to the plurality of touch electrodes 20 in the first touch area AA 1; at a second moment, the second gate control line SW2 outputs an active level, and the second switching units 2112 in the 4 gate circuits 210 are turned on to transmit the first touch scan signals transmitted from the first input terminal in1, the second input terminal in2, the third input terminal in3 and the fourth input terminal in4 to the plurality of touch electrodes 20 in the second touch area AA 2; at a third time, the third gate control line SW3 outputs an active level, and the third switching units 2113 of the 4 gate circuits 210 are turned on to transmit the first touch scan signals transmitted from the first input terminal in1, the second input terminal in2, the third input terminal in3, and the fourth input terminal in4 to the plurality of touch electrodes 20 in the third touch area AA 3. Or, the first touch scanning signals applied to the M touch electrodes of the first touch area AA1, the first touch scanning signals applied to the M touch electrodes of the second touch area AA2, and the first touch scanning signals applied to the M touch electrodes of the fourth touch area AA4 in a time-sharing manner; specifically, at the first moment, the first gate control line SW1 outputs an active level, and the first switching units 2111 in the 4 gate circuits 210 are turned on to transmit the first touch scan signals transmitted by the first input terminal in1, the second input terminal in2, the third input terminal in3, and the fourth input terminal in4 to the plurality of touch electrodes 20 in the first touch area AA 1; at a second moment, the second gate control line SW2 outputs an active level, and the second switching units 2112 in the 4 gate circuits 210 are turned on to transmit the first touch scan signals transmitted from the first input terminal in1, the second input terminal in2, the third input terminal in3 and the fourth input terminal in4 to the plurality of touch electrodes 20 in the second touch area AA 2; at the third moment, the fourth gate control line SW4 outputs an active level, and the fourth switch unit 2114 in the 4 gate circuits 210 is turned on to transmit the first touch scan signals transmitted from the first input terminal in1, the second input terminal in2, the third input terminal in3, and the fourth input terminal in4 to the plurality of touch electrodes 20 in the fourth touch area AA 4. Or, the first touch scanning signals applied to the 4 touch electrodes of the first touch area AA1, the first touch scanning signals applied to the 4 touch electrodes of the third touch area AA3, and the first touch scanning signals applied to the 4 touch electrodes of the fourth touch area AA4 in a time-sharing manner; specifically, at the first moment, the first gate control line SW1 outputs an active level, and the first switching units 2111 in the 4 gate circuits 210 are turned on to transmit the first touch scan signals transmitted by the first input terminal in1, the second input terminal in2, the third input terminal in3, and the fourth input terminal in4 to the plurality of touch electrodes 20 in the first touch area AA 1; at the second moment, the third gate control line SW3 outputs an active level, and the third switching units 2113 of the 4 gate circuits 210 are turned on to transmit the first touch scan signals transmitted from the first input terminal in1, the second input terminal in2, the third input terminal in3 and the fourth input terminal in4 to the plurality of touch electrodes 20 in the third touch area AA 3; at the third moment, the fourth gate control line SW4 outputs an active level, and the fourth switch unit 2114 in the 4 gate circuits 210 is turned on to transmit the first touch scan signals transmitted from the first input terminal in1, the second input terminal in2, the third input terminal in3, and the fourth input terminal in4 to the plurality of touch electrodes 20 in the fourth touch area AA 4. The time sequence of the first touch scanning signals applied to the 4 touch electrodes of each touch area AA is not limited.
It should be noted that fig. 15 is a schematic diagram of a touch driving circuit, but the present application is not limited thereto, and those skilled in the art can set the touch driving circuit according to practical situations, as long as the time-sharing driving of different touch areas AA can be realized.
Optionally, fig. 16 is a schematic structural diagram of a further driving circuit according to an embodiment of the present application, and as shown in fig. 16, the driving circuit further includes a timing control circuit 300 and a display driving circuit 400; the timing control circuit 300 is configured to provide a frame synchronization signal at each image frame, where the frame synchronization signal includes at least one display driving stage and a plurality of touch driving stages, and K is a positive integer greater than or equal to 1; a display driving circuit 400 for outputting a display driving signal for performing a picture display in a display driving stage; the touch driving circuit 200 is configured to apply a first touch scanning signal to M touch electrodes in different touch areas in a time-sharing manner in a touch driving stage; the touch driving circuit 200 is further configured to apply a first touch scanning signal to M touch electrodes of at least some of the N touch areas in a touch driving stage; at least part of the touch area comprises an L-th touch area so as to realize time-sharing driving of touch and display.
Based on the same inventive concept, the embodiment of the invention also provides a touch display device. The touch display device provided by the embodiment of the invention comprises the touch display panel and the driving circuit in the embodiment, so that the touch display device provided by the embodiment of the invention has the corresponding beneficial effects in the embodiment, and the details are not repeated here. . The touch display device may be, for example, an electronic device such as a mobile phone, a computer, a smart wearable device (e.g., a smart watch), and a vehicle-mounted display device, which is not limited in the embodiment of the present invention.
Fig. 17 is a schematic structural diagram of a touch display device according to an embodiment of the invention, and as shown in fig. 17, a touch display device 500 includes a touch display panel 600 and a driving circuit 700 in the above embodiment.
The touch chip and the display chip may be integrated into the same chip, and the touch driving circuit may be integrated inside the chip, or the touch driving circuit is disposed in the touch display panel 600, which is not limited in this embodiment.
Alternatively, the touch display panel 600 includes a liquid crystal display panel or an organic light emitting display panel.
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 (14)

1. The driving method of the touch display panel is characterized in that the touch display panel comprises a plurality of Q touch groups which are sequentially arranged along the pixel row direction or the pixel column direction; the touch area group comprises N touch areas which are sequentially arranged along the arrangement direction of the touch area group; each touch area comprises M touch electrodes;
the driving method includes:
applying first touch scanning signals to M touch electrodes of different touch areas in a time-sharing manner; wherein, M of the touch electrodes in each touch area apply a time overlap of a first touch scanning signal; and applying a time overlap of a first touch scanning signal to the M touch electrodes of the touch areas with the same sequence numbers of different touch groups;
determining a touch area according to touch detection signals fed back by the M touch electrodes of each touch area;
when the touch area is an L-th touch area, applying a first touch scanning signal to M touch electrodes of at least part of the N touch areas; wherein at least part of the touch area comprises the L-th touch area;
determining a touch position according to a touch detection signal fed back by the touch electrode of the L-th touch area;
Wherein Q, L, M and N are positive integers greater than or equal to 1; l is less than or equal to N;
the time period of applying the first touch scanning signal to the M touch electrodes of different touch areas in a time-sharing mode is a first time period, and when the touch area is an L-th touch area, the time period of applying the first touch scanning signal to the M touch electrodes of at least part of the N touch areas is a second time period, wherein the second time period is smaller than the first time period.
2. The driving method according to claim 1, wherein when the touch area is an L-th touch area, applying a first touch scan signal to M of the touch electrodes of at least part of the N touch areas includes:
when the touch area is an L-th touch area, only first touch scanning signals applied to M touch electrodes of the L-th touch area are applied.
3. The driving method according to claim 1, wherein when the touch area is an L-th touch area, applying a first touch scan signal to M of the touch electrodes of at least part of the N touch areas includes:
When the touch area is an L-th touch area, applying a first touch scanning signal to M touch electrodes of part of the N touch areas; the partial touch area includes the L-th touch area.
4. The driving method according to claim 1, wherein when the touch area is an L-th touch area, applying a first touch scan signal to M of the touch electrodes of at least part of the N touch areas includes:
when the touch area is an L-th touch area, applying first touch scanning signals to M touch electrodes of the L-th touch area, and applying second touch scanning signals to M touch electrodes of other touch areas except the L-th touch area in a time-sharing manner;
the duration of applying the second touch scanning signal is less than the duration of applying the first touch scanning signal.
5. The driving method according to claim 1, wherein the touch display panel includes at least one display area sequentially arranged in a pixel column direction;
each image frame comprises at least one display driving stage and a plurality of touch driving stages; each image frame comprises K touch frames, wherein K is a positive integer greater than or equal to 1; each touch frame comprises a plurality of touch driving stages;
Applying first touch scanning signals to M touch electrodes of different touch areas in a time sharing mode, wherein the first touch scanning signals comprise:
applying first touch scanning signals to M touch electrodes of N touch areas in a one-to-one corresponding time sharing mode in a plurality of touch driving stages of each touch frame;
the driving method further includes:
and in the display driving stage, performing display driving on the sub-pixels in the display area.
6. The driving method according to claim 5, wherein the touch display panel includes a plurality of display areas sequentially arranged in a pixel column direction; each image frame comprises a plurality of display driving phases; the display driving stage and the touch driving stage are arranged at intervals;
in a display driving stage, performing display driving on the sub-pixels in the display area, including:
and performing display driving on the sub-pixels in the display areas in a time-sharing mode corresponding to the display driving phases one by one in each image frame.
7. The driving method according to claim 6, wherein the duration of each of the touch driving stages is the same, and the duration of each of the display driving stages is the same.
8. The driving method according to claim 5, wherein each image frame further comprises at least one noise detection stage;
The driving method further includes:
noise detection is carried out through a noise detection stage so as to obtain a touch detection noise signal;
determining a touch position according to a touch detection signal fed back by the touch electrode of the L-th touch area comprises:
and determining the touch position according to the touch detection signal fed back by the touch electrode of the L-th touch area and the touch detection noise signal.
9. The driving method according to claim 8, wherein each touch detection frame includes the noise detection stage.
10. The driving circuit is characterized by being used for driving the touch display panel; the touch display panel comprises a plurality of Q touch groups which are sequentially arranged along the pixel row direction or the pixel column direction; the touch area group comprises N touch areas which are sequentially arranged along the arrangement direction of the touch area group; each touch area comprises M touch electrodes;
the driving circuit includes: the touch driving circuit is used for applying first touch scanning signals to the M touch electrodes of different touch areas in a time-sharing mode and receiving touch detection signals fed back by the M touch electrodes of each touch area;
The touch driving circuit is further configured to apply a first touch scanning signal to M touch electrodes of at least some of the N touch areas when the touch area is an L-th touch area; receiving touch detection signals fed back by the M touch electrodes of at least part of the touch area; wherein at least part of the touch area comprises the L-th touch area;
wherein, M of the touch electrodes in each touch area apply a time overlap of a first touch scanning signal; and applying a time overlap of a first touch scanning signal to the M touch electrodes of the touch areas with the same sequence numbers of different touch groups; and Q, L, M and N are both positive integers greater than or equal to 1; l is less than or equal to N;
the time period of applying the first touch scanning signal to the M touch electrodes of different touch areas in a time-sharing mode is a first time period, and when the touch area is an L-th touch area, the time period of applying the first touch scanning signal to the M touch electrodes of at least part of the N touch areas is a second time period, wherein the second time period is smaller than the first time period.
11. The driving circuit of claim 10, wherein the touch driving circuit comprises M x Q gate circuits; each gating circuit comprises N switch units, and first ends of the N switch units are electrically connected;
The second end of the ith switch unit in each gating circuit is electrically connected with the touch electrode of the ith touch area; the jth touch electrode of each touch area is electrically connected with the jth gating circuit; wherein i is less than or equal to N, j is less than or equal to M;
the switch units with the same sequence numbers in different gating circuits are sequentially conducted so as to apply first touch scanning signals to M touch electrodes in different touch areas in a time-sharing mode;
when the touch area is an L-th touch area, switching units with at least part of the same sequence numbers in different gating circuits are sequentially conducted so as to apply first touch scanning signals to M touch electrodes of at least part of the N touch areas in a time-sharing mode; wherein, at least part of the touch area comprises an L-th touch area.
12. The driver circuit according to claim 10, further comprising a timing control circuit and a display driver circuit;
the timing control circuit is used for providing a frame synchronization signal in each image frame, wherein the frame synchronization signal comprises at least one display driving stage and a plurality of touch driving stages, and K is a positive integer greater than or equal to 1;
the display driving circuit is used for outputting a display driving signal to display pictures in the display driving stage;
The touch driving circuit is used for applying first touch scanning signals to M touch electrodes of different touch areas in a time-sharing mode in the touch driving stage;
the touch driving circuit is further configured to apply a first touch scanning signal to M touch electrodes of at least some of the N touch areas in the touch driving stage; wherein at least a portion of the touch area includes the L-th touch area.
13. A touch display device comprising a touch display panel and the drive circuit of any one of claims 10-12.
14. The touch display device of claim 13, wherein the touch display panel comprises a liquid crystal display panel or an organic light emitting display panel.
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