CN112835474B - Touch panel, driving method thereof and display device - Google Patents

Touch panel, driving method thereof and display device Download PDF

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Publication number
CN112835474B
CN112835474B CN202110215004.1A CN202110215004A CN112835474B CN 112835474 B CN112835474 B CN 112835474B CN 202110215004 A CN202110215004 A CN 202110215004A CN 112835474 B CN112835474 B CN 112835474B
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touch
circuit
switch unit
storage
electrodes
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CN112835474A (en
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林孚银
闫东
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Hefei Visionox Technology Co Ltd
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Hefei Visionox Technology 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
    • 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Position Input By Displaying (AREA)

Abstract

The embodiment of the invention discloses a touch panel, a driving method thereof and a display device, wherein the touch panel comprises at least two groups of control circuits, the control circuits are in one-to-one correspondence with touch electrode groups, and the control circuits are connected with touch electrodes in the corresponding touch electrode groups through touch wires; the control circuit comprises a plurality of first switch units, a touch sensing analog front-end circuit and a storage circuit; the first switch units of the same group of control circuits are configured to be turned on in a time-sharing manner, and part of the first switch units of different groups of control circuits are configured to be turned on simultaneously; the touch sensing analog front-end circuit is used for reading signals of the touch electrode in the conducting period of the first switch unit and outputting the signals to the storage circuit for storage; and the analog-to-digital conversion circuit is used for time-sharing reading signals stored by the storage circuits in each group of control circuits. Compared with the prior art, the technical scheme provided by the embodiment of the invention can reduce the touch scanning time and is beneficial to improving the touch point reporting rate.

Description

Touch panel, driving method thereof and display device
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a touch panel, a driving method thereof and a display device.
Background
With the rapid development of display technology, touch display devices have been widely used in various fields. With the increasing demands of Touch display devices, touch and Display Driving Integration (TDDI) technology has become the mainstream.
The touch control driving chip and the display driving chip can be integrated in one driving chip through TDDI technology so as to drive the touch control display device. However, the increasing range of the touch point reporting rate of the touch display device in the prior art is limited, and the requirement of the customer cannot be met.
Disclosure of Invention
The embodiment of the invention provides a touch panel, a driving method thereof and a display device, which are used for improving the touch point reporting rate and being beneficial to improving the display effect and the touch effect.
In a first aspect, an embodiment of the present invention provides a touch panel, including at least one touch area; the touch area comprises a plurality of touch electrodes, and the touch electrodes are divided into at least two touch electrode groups;
The touch panel further includes:
the control circuits are in one-to-one correspondence with the touch electrode groups, and are connected with the corresponding touch electrodes in the touch electrode groups through touch wires; the control circuit comprises a plurality of first switch units, a touch sensing analog front-end circuit and a storage circuit; the first switch units of the same group of the control circuits are configured to be turned on in a time-sharing manner, and at least part of the first switch units of different groups of the control circuits are configured to be turned on simultaneously; the touch sensing analog front-end circuit is used for reading signals of the touch electrode during the conduction period of the first switch unit and outputting the signals to the storage circuit for storage;
And the analog-to-digital conversion circuit is connected with the storage circuit and is used for time-sharing reading signals stored by the storage circuit in each group of control circuits.
Optionally, the plurality of touch electrodes are arranged in an array, the at least two groups of touch electrode groups are arranged in parallel along a row direction, each group of touch electrode groups comprises at least two rows of touch electrodes, the touch electrodes in each group of touch electrode groups are connected with the first end of the first switch unit in a one-to-one correspondence manner through touch wirings, and the second ends of the first switch units connected with the touch electrodes in the same row of touch electrode groups are connected with a touch sensing analog front-end circuit.
Optionally, at least two touch sensing analog front-end circuits are connected with the same analog-to-digital conversion circuit through corresponding storage circuits;
preferably, the touch electrodes in the same row are connected to the same analog-to-digital conversion circuit.
Optionally, the first switch units connected with the touch electrodes in the same column in the same group of touch electrode groups are turned on or off simultaneously.
Optionally, the scanning directions of the touch electrodes in the first group of touch electrodes and the last group of touch electrodes are opposite.
Optionally, the 2k+1-th set of touch electrodes is opposite to the scanning direction of the touch electrodes in the 2k+2-th set of touch electrodes, where k is an integer greater than or equal to 0.
Optionally, the storage circuit includes a storage capacitor, a second switching unit and a third switching unit; the second switch unit is connected between the first end of the storage capacitor and the touch sensing analog front-end circuit, the second end of the storage capacitor is connected with a reference voltage, and the third switch unit is connected between the first end of the storage capacitor and the analog-to-digital conversion circuit.
Optionally, for the first switch unit, the second switch unit and the third switch unit connected to a channel between the same touch electrode and the analog-to-digital conversion circuit, the second switch unit is turned on at least once during the turn-on period of the first switch unit, and the third switch unit is turned on after the turn-off period of the first switch unit;
Preferably, the first switching unit includes a first transistor, the second switching unit includes a second transistor, and the third switching unit includes a third transistor.
In a second aspect, an embodiment of the present invention further provides a display device, where the display device includes the touch panel described in any embodiment of the present invention. The control circuit and the analog-to-digital conversion circuit are integrated in a driving chip; or the first switch unit is integrated in the touch panel, and the touch sensing analog front-end circuit, the storage circuit and the analog-to-digital conversion circuit are integrated in the driving chip.
In a third aspect, an embodiment of the present invention further provides a method for driving a touch panel, where the touch panel includes at least one touch area; the touch area comprises a plurality of touch electrodes, and the touch electrodes are divided into at least two touch electrode groups;
The touch panel further includes:
The control circuits are in one-to-one correspondence with the touch electrode groups, and are connected with the corresponding touch electrodes in the touch electrode groups through touch wires; the control circuit comprises a plurality of switch first switch units, a touch sensing analog front-end circuit and a storage circuit; the switch first switch units of the same group of the control circuits are configured to be turned on in a time-sharing manner, and at least part of the switch first switch units of different groups of the control circuits are configured to be turned on simultaneously; the touch sensing analog front-end circuit is used for reading signals of the touch electrode during the conduction period of the first switch unit of the switch and outputting the signals to the storage circuit for storage;
the analog-to-digital conversion circuit is connected with the storage circuit and used for time-sharing reading signals stored by the storage circuit in each group of control circuits;
the driving method of the touch panel comprises the following steps:
The first switch units of the same group of control circuits are conducted in a time sharing mode, at least part of the first switch units of different groups of control circuits are conducted at the same time, and the touch sensing analog front-end circuit reads signals of the touch electrodes during the conduction period of the switches and outputs the signals to the storage circuit for storage;
The analog-to-digital conversion circuit reads signals stored by the storage circuits in each group of control circuits in a time-sharing mode.
According to the technical scheme provided by the embodiment of the invention, the plurality of touch electrodes in the touch area are divided into at least two groups of touch electrode groups, and each group of touch electrode groups is correspondingly connected with one group of control circuit so as to realize the scanning of the touch electrodes. The control circuit comprises a plurality of first switch units, a touch sensing analog front end circuit and a storage circuit, wherein the first switch units of the same group of control circuits are configured to conduct in a time sharing mode, and part of the first switch units of different groups of control circuits are configured to conduct simultaneously. Compared with the prior art, the technical scheme provided by the embodiment of the invention can reduce the time for completing one touch scanning by simultaneously scanning at least two touch electrode groups, so that the touch point reporting rate can be increased, or more time can be reserved for display, the refresh rate of the touch panel can be improved, and the display effect of the touch panel can be further improved. Meanwhile, a storage circuit is added in the control circuit corresponding to the touch sensing analog front-end circuit so as to store touch electrode signals, so that the touch electrode signals in a plurality of groups of touch electrode groups can be read under the condition that an analog-to-digital conversion circuit is not added, and the design difficulty of the circuit is reduced.
Drawings
Fig. 1 is a waveform diagram of a driving signal of a touch panel according to the prior art;
fig. 2 is a schematic structural diagram of a touch panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another touch panel according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a touch electrode scanning result according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another touch panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another touch panel according to an embodiment of the present invention;
Fig. 7 is a schematic structural diagram of another touch panel according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a driving timing sequence of a touch panel according to an embodiment of the invention;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention;
Fig. 10 is a flowchart of a driving method of a touch panel according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
As described in the background art, the touch panel adopting TDDI technology in the prior art has the problem that the increasing range of the touch point reporting rate is limited, and this problem occurs because, in one display period, the time between the display frame of the display mode and the touch frame of the touch mode is fixed, and when the time of the display frame (or the touch frame) increases, the time of the touch frame (or the display frame) must be reduced, so that the display effect or the touch effect of the touch display panel is reduced. The specific analysis is as follows:
Fig. 1 is a waveform diagram of a driving signal of a Touch panel in the prior art, referring to fig. 1, in a Display Period, touch driving signals are regularly inserted to enable the Touch panel to alternately operate between a Display mode and a Touch mode, wherein the Display mode is a Display Period (DP), and the Touch mode is a Touch Period (TP). The time of one display period is fixed, when the refresh rate of the panel is increased, the time occupied by each frame of display picture is increased, so that the time of the touch control period TP is shorter and shorter, the touch control point reporting rate of the touch control panel is lower, and the touch control sensitivity is further limited; when the touch point reporting rate is increased, the time occupied by the touch period TP is increased, so that the time of the display period DP is shorter and shorter, the refresh rate of the touch panel is lower, and the display effect is reduced.
In view of the above problems, embodiments of the present invention provide a touch panel to improve the touch point reporting rate, which is beneficial to improving the display effect and the touch effect. Fig. 2 is a schematic structural diagram of a touch panel according to an embodiment of the invention, and referring to fig. 2, the touch panel includes at least one touch area 100; the touch area 100 includes a plurality of touch electrodes 10, and the plurality of touch electrodes 10 are divided into at least two touch electrode groups; the touch panel further includes: at least two groups of control circuits 30, wherein the control circuits 30 are in one-to-one correspondence with the touch electrode groups, and the control circuits 30 are connected with the touch electrodes 10 in the corresponding touch electrode groups through touch wiring; the control circuit 30 includes a plurality of first switch units 31, a touch sensing analog front end circuit 32, and a memory circuit 33; the first switching units 31 of the same set of control circuits 30 are configured to be turned on in a time-sharing manner, and at least part of the first switching units 31 of different sets of control circuits 30 are configured to be turned on simultaneously; the touch sensing analog front end circuit 32 is used for reading the signal of the touch electrode 10 during the on period of the first switch unit 31 and outputting the signal to the storage circuit 33 for storage; the analog-to-digital conversion circuit 40, the analog-to-digital conversion circuit 40 is connected to the memory circuit 33, and is used for time-sharing reading the signals stored in the memory circuit 33 in each group of control circuits 30.
In this embodiment, the touch panel may be divided into a plurality of touch areas 100, for example, two touch areas 100, namely, a first touch area 101 and a second touch area 102. The first touch area 101 corresponds to the left half screen of the touch panel, the second touch area 102 corresponds to the right half screen of the touch panel, and the first touch area 101 and the second touch area 102 scan simultaneously in the same scanning mode. The following embodiments are all described by taking the first touch area 101 as an example.
In this embodiment, a touch area 100 includes two touch electrode sets, and each touch electrode set is correspondingly connected to a set of control circuits 30, that is, the touch electrodes 10 in the first touch electrode set 201 are connected to the first control circuit 301 through touch traces, and the touch electrodes 10 in the second touch electrode set 202 are connected to the second control circuit 302 through touch traces. The control circuit 30 is configured to provide a driving signal to the touch electrode in the touch area 100 to turn on or off the touch electrode 10, and to read the touch signal of the touch electrode 10. Each control circuit 30 includes a plurality of first switch units 31 and a touch sensing analog front end circuit 32, and the first switch units 31 are used for switching on or off the touch electrodes 10 according to the driving signals. The touch sensing analog front end circuit 32 is configured to read a sensing signal of the touch electrode, and the analog-to-digital conversion circuit 40 reads the sensing signal and performs analog-to-digital conversion on the sensing signal to generate touch information, thereby completing the touch scanning function. The plurality of first switch units 31 in the first set of control circuits 301 conduct the touch electrodes 10 in the first touch electrode set 201 in a time-sharing manner, and at least part of the first switch units 31 in the first set of control circuits 301 and the second set of control circuits 302 conduct simultaneously, so that part of the touch electrodes 10 in the first set of touch electrodes 201 and the second set of touch electrodes 202 scan simultaneously. The number of turned-on first switch units 31 may be determined by the number of touch electrodes in each touch electrode group. Illustratively, the first set of touch electrodes 201 includes 2 rows of touch electrodes 10, and the second set of touch electrodes 202 includes 3 rows of touch electrodes 10. The first row of touch electrodes in the first group of touch electrodes 201 and the first switch units 31 corresponding to the first row of touch electrodes in the second group of touch electrodes 202 are conducted simultaneously; the second row of touch electrodes in the first group of touch electrodes 201 are simultaneously turned on with the first switch units 31 corresponding to the second row of touch electrodes in the second group of touch electrodes 202, and the first switch units 31 corresponding to the remaining third row of touch electrodes in the second group of touch electrodes 202 are individually turned on. When the number of the touch electrode columns of the first touch electrode set 201 is the same as the number of the touch electrode columns of the second touch electrode set 202, for example, the first touch electrode set 201 includes 2 rows of touch electrodes 10, the second touch electrode set 202 includes 2 rows of touch electrodes 10, and then the first switch units 31 corresponding to the first rows of touch electrodes in the first touch electrode set 201 and the first rows of touch electrodes in the second touch electrode set 202 are turned on simultaneously; the second row of touch electrodes in the first group of touch electrodes 201 is turned on simultaneously with the first switch unit 31 corresponding to the second row of touch electrodes in the second group of touch electrodes 202. Similar to the above, the present embodiment is only described with reference to the case that the number of the touch electrode rows of the first touch electrode set 201 and the second touch electrode set 202 in fig. 2 is the same.
It should be understood that, in the prior art, the first touch area 101 corresponds to a set of control circuits 30, and the touch electrodes in the touch panel are scanned column by column, and the time required for completing the scanning of the first touch area 101 is t. In this embodiment, the touch electrodes 10 in the first touch area 101 are divided into two groups of touch electrode groups, each group of touch electrode groups corresponds to one group of control circuits 30, and part of the first switch units 31 in the two groups of control circuits 30 are turned on simultaneously, that is, the two groups of touch electrode groups scan simultaneously, so that the time required for completing the scanning of the first touch area 101 is t/2. The saved time t/2 may be further scanned for the first touch area 101 to increase the touch report rate of the first touch area 101. Or the saved time t/2 is used for displaying, the refresh rate of the touch panel can be improved without changing the touch point reporting rate of the touch area 100, and the display effect of the touch panel can be further improved.
Since the number of the first switch units 31 and the touch sensing analog front end circuits 32 is increased in this embodiment, in order to reduce the design difficulty of the circuit and save space, the storage circuits 33 are added corresponding to the touch sensing analog front end circuits 32 in the control circuit 30 to store the touch electrode signals read by the touch sensing analog front end circuits 32 during the on period of the corresponding first switch units 31, and then the analog-to-digital conversion circuits 40 time-share the touch electrode signals stored in each touch electrode group in the storage circuits 33. By the technical scheme, the reading of the touch electrode signals in the plurality of groups of touch electrode groups can be realized under the condition that the analog-to-digital conversion circuit 40 is not added, and the design of the circuit is facilitated.
It should be noted that, since the scanning modes of the first touch area 101 and the second touch area 102 are the same, the time for the touch panel to complete the full-screen scanning is reduced by half correspondingly. According to the technical scheme provided by the embodiment of the invention, the plurality of touch electrodes in the touch area are divided into at least two groups of touch electrode groups, and each group of touch electrode groups is correspondingly connected with one group of control circuit so as to realize the scanning of the touch electrodes. The control circuit comprises a plurality of first switch units, a touch sensing analog front end circuit and a storage circuit, wherein the first switch units of the same group of control circuits are configured to conduct in a time sharing mode, and part of the first switch units of different groups of control circuits are configured to conduct simultaneously. Compared with the prior art, the technical scheme provided by the embodiment of the invention can reduce the time for completing one touch scanning by simultaneously scanning at least two touch electrode groups, so that the touch point reporting rate can be increased, or more time can be reserved for display, the refresh rate of the touch panel can be improved, and the display effect of the touch panel can be further improved. Meanwhile, a storage circuit is added in the control circuit corresponding to the touch sensing analog front-end circuit so as to store touch electrode signals, so that the touch electrode signals in a plurality of groups of touch electrode groups can be read under the condition that an analog-to-digital conversion circuit is not added, and the design difficulty of the circuit is reduced.
Of course, in other embodiments, the scanning manner of the first touch area 101 and the second touch area 102 may be different, and the application scenarios corresponding to the touch areas may be different. The first touch area 101 is a touch frequent area, such as a fingerprint identification area, and the second touch area 102 is a touch non-frequent area, such as a touch area corresponding to a display area; in order to improve the touch effect of the first touch area 101, the touch point reporting rate of the first touch area 101 needs to be increased, so that the first touch area 101 is scanned by adopting the technical scheme provided by the embodiment of the invention, the second touch area 102 is touched by adopting the technical scheme in the prior art, and the proportion of the display periods of the first touch area 101 and the second touch area 102 can be set to be equal in the same time period, which is beneficial to ensuring the display effect. Because the first touch area 101 needs to be frequently touched, the technical scheme provided by the embodiment of the invention can reduce the time for completing one touch scan by simultaneously scanning at least two touch electrode groups, thereby increasing the touch point reporting rate and further improving the touch effect of the corresponding touch area.
Fig. 3 is a schematic structural diagram of another touch panel according to the embodiment of the present invention, referring to fig. 2 and 3, based on the above technical solution, a plurality of touch electrodes 10 are arranged in an array, at least two touch electrode sets are arranged in parallel along a row direction, each touch electrode set includes at least two rows of touch electrodes, the touch electrodes in each touch electrode set are connected to a first end of a first switch unit 31 in a one-to-one correspondence manner through touch wirings, and a second end of the first switch unit 31 connected to the same row of touch electrodes 10 in the same touch electrode set is connected to a touch sensing analog front end circuit 32.
However, in other embodiments, the touch electrode 10 may be a mutual capacitive touch electrode, and a control circuit may be added correspondingly. In this embodiment, the plurality of touch electrodes 10 are arranged in an array, and the same row of touch electrodes 10 are turned on and off simultaneously, so as to realize a row-by-row sequential scan. Taking the first touch area 101 as an example, the first touch electrode group 201 and the second touch electrode group 202 are arranged in parallel along the row direction. For convenience of description, in this embodiment, each touch electrode group includes two rows of touch electrodes, a first row of touch electrodes in the first touch electrode group 201 are respectively and correspondingly connected to a first end of the first sub-switch unit SW1, a second row of touch electrodes are respectively and correspondingly connected to a first end of the second sub-switch unit SW2, and a second end of the first sub-switch unit SW1 and the second sub-switch unit SW2, to which the first row of touch electrodes are correspondingly connected, are connected to a touch sensing analog front-end circuit 32; the first row of touch electrodes in the second touch electrode set 202 are respectively and correspondingly connected to the first end of the third sub-switch unit SW3, the second row of touch electrodes are respectively and correspondingly connected to the first end of the fourth sub-switch unit SW4, and the second ends of the third sub-switch unit SW3 and the fourth sub-switch unit SW4, which are respectively and correspondingly connected to the first row of touch electrodes, are connected to another touch sensing analog front-end circuit 32; … …, and so on, all rows of touch electrodes are correspondingly connected to the corresponding touch sensing analog front end circuits 32.
With continued reference to fig. 3, at least two touch sensing analog front end circuits 32 are connected to the same analog-to-digital conversion circuit 40 through corresponding memory circuits 33. For example, each row of touch electrodes 10 in the same touch electrode group may be connected to a touch sensing analog front-end circuit 32 of a first switch unit 31, and connected to the same analog-to-digital conversion circuit 40 through a corresponding memory circuit 33; the touch electrodes 10 connected to the same row may be connected to the first switch unit 31, the touch sensing analog front-end circuit 32, and the corresponding storage circuit 33 may be connected to the same analog-to-digital conversion circuit 40. As a preferred implementation of the present embodiment, in order to facilitate circuit arrangement and signal design, the touch sensing analog front end circuits 32 connected to the first switch units 31 are connected to the same row of touch electrodes 10, and the same analog-to-digital conversion circuits 40 are connected to the corresponding storage circuits 33. In the first touch area 101, the second ends of the first sub-switch unit SW1 and the second sub-switch unit SW2 connected to the first row of touch electrodes 10 in the first group of touch electrodes 201 are connected to one touch sensing analog front end circuit 32, and the second ends of the third sub-switch unit SW3 and the fourth sub-switch unit SW4 connected to the first row of touch electrodes 10 in the second group of touch electrodes 202 are connected to the other touch sensing analog front end circuit 32, and the two touch sensing analog front end circuits 32 are respectively connected to the same analog-to-digital conversion circuit 40 through the corresponding storage circuits 33. Therefore, the same row of touch electrodes 10 in the first touch electrode group 201 and the second touch electrode group 202 share one analog-to-digital conversion circuit 40, the number of the analog-to-digital conversion circuits 40 is saved, and the reading of touch electrode signals in a plurality of groups of touch electrode groups is realized under the condition that the analog-to-digital conversion circuits 40 are not increased.
The storage circuit 33 can store the signals of the touch electrodes sensed by the touch sensing analog front end circuit 32, and the analog-to-digital conversion circuit 40 reads the signals stored in each storage circuit 33 in time. Since the touch electrodes 10 are scanned row by row, the first switch units 31 connected to the touch electrodes 10 in each row in the same touch electrode group are turned on or off in a time-sharing manner, and the first switch units 31 connected to the touch electrodes in the same row in the same touch electrode group are turned on or off at the same time. For example, with continued reference to fig. 3, the first sub-switch unit SW1 correspondingly connected to the first row of touch electrodes in the first group of touch electrodes 201 and the fourth sub-switch unit SW4 correspondingly connected to the last row of touch electrodes in the second group of touch electrodes 202 are turned on simultaneously, the corresponding touch electrode signals are respectively stored in the respective corresponding storage circuits 33, and the digital-to-analog conversion circuit 40 sequentially reads the signals stored in the respective storage circuits 33. After the signals in all the storage circuits 33 are read, the second sub-switch unit SW2 correspondingly connected to the second row of touch electrodes in the first group of touch electrodes 201 and the third sub-switch unit SW3 correspondingly connected to the last second row of touch electrodes in the second group of touch electrodes 202 are simultaneously turned on, at this time, the first sub-switch unit SW1 and the fourth sub-switch unit SW4 are already turned off, the corresponding touch electrode signals are respectively stored in the respective corresponding storage circuits 33, and the digital-to-analog conversion circuit 40 sequentially reads the signals stored in the respective storage circuits 33, thereby completing the scanning of all the touch electrodes in the first touch area 101.
It should be noted that, since the first switch units 31 connected to the same row of touch electrodes in the same group of touch electrodes are turned on simultaneously, the analog-to-digital conversion circuits 40 corresponding to the first switch units 31 connected to the same row of touch electrodes are read simultaneously, so that the final scanning effect is that the same row of touch electrodes complete scanning simultaneously, as shown in fig. 4, wherein fig. 4 is a schematic diagram of a scanning result of the touch electrodes provided in the embodiment of the invention. The scanning direction of the touch electrodes 10 in the first group of touch electrodes 201 is along the X direction, the scanning direction of the touch electrodes 10 in the second group of touch electrodes 202 is along the X' direction, and the touch electrodes 10 in the first group of touch electrodes 201 and the touch electrodes 10 in the second group of touch electrodes 202 are simultaneously scanned, so that compared with the prior art, half of touch scanning time can be reduced.
In this embodiment, when the number of the touch electrode groups is multiple (greater than two) and is an even number, the scanning directions of the touch electrodes in the 2k+1-th touch electrode group and the 2k+2-th touch electrode group are opposite, where k is an integer greater than or equal to 0. That is, the scanning directions of the touch electrodes in the two adjacent and non-repeated touch electrode groups are opposite. When the number of the touch electrode groups is odd, the scanning directions of the touch electrodes in the two adjacent and non-repeated touch electrode groups are opposite, and the scanning directions of the touch electrodes in the rest of the single touch electrode groups can be the same as or opposite to the scanning directions of the touch electrodes in the adjacent touch electrode groups.
As another alternative implementation manner of the embodiment of the present invention, the touch electrode sets may be more than two sets. Fig. 5 is a schematic structural diagram of another touch panel according to an embodiment of the present invention, and specifically illustrates a case where the touch electrode sets are three sets, which is different from the touch panel shown in fig. 3 including two sets of touch electrode sets in that a set of control circuits 30 is added, and the connection relationship is similar to that shown in fig. 3, and will not be described herein.
Of course, in other embodiments, the same touch electrode set may further include three or more rows of touch electrodes, and in the actual design process, different designs may be performed according to the requirements.
As another alternative implementation of the embodiment of the present invention, fig. 6 is a schematic structural diagram of another touch panel provided by the embodiment of the present invention, and referring to fig. 3 and fig. 6, the storage circuit 33 includes a storage capacitor CH, a second switch unit 312, and a third switch unit 303; the second switch unit 312 is connected between the first end of the storage capacitor CH and the touch sensing analog front end circuit 32, the second end of the storage capacitor CH is connected to the reference voltage VREF, and the third switch unit 303 is connected between the first end of the storage capacitor CH and the analog-to-digital conversion circuit 40.
In the present embodiment, the second switch unit 312 is configured to conduct a channel between the storage capacitor CH and the touch sensing analog front end circuit 32, so as to store a signal sensed by the touch sensing analog front end circuit 32 by the touch electrode 10 onto the storage capacitor CH; the third switching unit 303 is configured to conduct a channel between the storage capacitor CH and the analog-to-digital conversion circuit 40, so that the analog-to-digital conversion circuit 40 can read the signal stored on the storage capacitor CH. In order to prevent interference between signals of touch electrodes in different groups of touch electrode groups, the third switch unit 303 correspondingly connected to the first switch unit 31 connected to the touch electrodes in different groups of touch electrode groups is turned on in a time-sharing manner, and the analog-to-digital conversion circuit 40 sequentially reads signals of touch electrodes in each group of touch electrode groups. The second switch unit 312 may be turned on simultaneously to store the signal sensed by the touch sensing analog front end circuit 32 onto the corresponding storage capacitor CH.
Fig. 7 is a schematic structural diagram of another touch panel according to an embodiment of the present invention, and based on the circuit shown in fig. 6, the control circuit 30 further includes a fourth switch unit 60 and a fifth switch unit 70, wherein the fourth switch unit 60 is connected between the second end of the first switch unit 31 connected to the same touch electrode set and the touch sensing analog front-end circuit 32, and a control end of the fourth switch unit 60 inputs a touch enable signal SW TP for switching the touch panel to be in a touch mode or a display mode. The first end of the fifth switching unit 70 inputs a touch scan signal TP Pulse, and the fifth switching unit 70 inputs the touch scan signal TP Pulse to the touch electrode under the control of the reset signal Rst to scan the touch electrode.
Fig. 8 is a schematic diagram of a driving timing sequence of a touch panel according to an embodiment of the present invention, and referring to fig. 7 and 8, for a first switch unit 31, a second switch unit 312 and a third switch unit 303 connected on a channel between the same touch electrode 10 and an analog-to-digital conversion circuit 40, the second switch unit 312 is turned on at least once during the turn-on period of the first switch unit 31, and the third switch unit 303 is turned on after the turn-off period of the first switch unit 31; preferably, the first switching unit 31 includes a first transistor T1, the second switching unit 312 includes a second transistor T2, the third switching unit 303 includes a third transistor T3, the fourth switching unit 60 includes a fourth transistor T4, and the fifth switching unit 70 includes a fifth transistor T5. The first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, and the fifth transistor T5 may be N-type transistors or P-type transistors, and may be set according to actual requirements. In this embodiment, the first transistor T1, the second transistor T2, the third transistor T3, and the fourth transistor T4 are all N-type transistors, and the fifth transistor T5 is a P-type transistor.
The gates of the first transistors T1 corresponding to the same row of touch electrodes 10 may be connected to the same output terminal of the switch timing control circuit 200, so as to control the first transistors T1 corresponding to the same row of touch electrodes 10 to be turned on or off simultaneously. The touch control enabling signal SW TP is high, and indicates that the touch control panel is in a touch control mode; the touch enable signal SW TP is low, indicating that the touch panel is in the display mode.
In the first period T1, the first transistor T1 in the first and fourth sub-switching units SW1 and SW4 is turned on, the first transistor T1 in the second and third sub-switching units SW2 and SW3 is turned off, during which the second transistor T2 is turned on a plurality of times, and the third transistor T3 is in an off state. The conduction principle of the second transistor T2 is as follows: after the touch scanning signal TP Pulse completes a set charging (or discharging) percentage, the second transistor T2 is turned on at least once; in general, the second transistor T2 is turned on faster than the frequency of the touch scan signal TP Pulse to ensure the accuracy of the touch sensing analog front end circuit 32 sensing the touch electrode signal.
When the reset signal Rst is at a low level, the touch scan signal TP Pulse is at a high level, the touch scan signal TP Pulse is input to the touch electrodes through the fourth transistor T4 and the first transistor T1, the touch sensing analog front-end circuits 32 corresponding to the first touch electrode group 201 respectively sense the signals of the first row of touch electrodes 10 in the first touch electrode group 201, and the touch sensing analog front-end circuits 32 corresponding to the second touch electrode group 202 respectively sense the signals of the last row of touch electrodes 10 in the second touch electrode group 202 and respectively store the signals on the corresponding storage capacitors CH.
In the second period T2, the first transistor T1 in the first sub-switch unit SW1 and the fourth sub-switch unit SW4 is turned off, the first transistor T1 in the second sub-switch SW2 and the third sub-switch unit SW3 is turned off, the second transistor T2 is turned off, the touch electrode in the first touch electrode group 201 is connected to the third transistor T3 on the channel between the first switch unit and the analog-to-digital conversion circuit 40, and the touch electrode in the second touch electrode group 202 is connected to the third transistor T3 on the channel between the first switch unit and the analog-to-digital conversion circuit 40, and the analog-to-digital conversion circuit 40 sequentially reads the signals stored on the storage capacitors CH under the action of the control signals SC1 and SC 2.
In the third period T3, the first transistor T1 in the first and fourth sub-switching units SW1 and SW4 is turned off, the first transistor T1 in the second and third sub-switching units SW2 and SW3 is turned on, during which the second transistor T2 is turned on a plurality of times, and the third transistor T3 is in an off state. The conduction principle of the second transistor T2 is as follows: after the touch scanning signal TP Pulse completes a set charging (or discharging) percentage, the second transistor T2 is turned on at least once; in general, the second transistor T2 is turned on faster than the frequency of the touch scan signal TP Pulse to ensure the accuracy of the touch sensing analog front end circuit 32 sensing the touch electrode signal.
When the reset signal Rst is at a low level, the touch scan signal TP Pulse is at a high level, the touch scan signal TP Pulse is input to the touch electrodes through the fourth transistor T4 and the first transistor T1, the touch sensing analog front-end circuits 32 corresponding to the first touch electrode group 201 respectively sense the signals of the touch electrodes 10 in the second row in the first touch electrode group 201, and the touch sensing analog front-end circuits 32 corresponding to the second touch electrode group 202 respectively sense the signals of the touch electrodes 10 in the last second row in the second touch electrode group 202 and respectively store the signals on the corresponding storage capacitors CH.
In the fourth period T4, the first transistor T1 in the first sub-switch unit SW1 and the fourth sub-switch unit SW4 is turned off, the first transistor T1 in the second sub-switch SW2 and the third sub-switch unit SW3 is turned off, the second transistor T2 is turned off, the touch electrode in the first touch electrode group 201 is connected to the third transistor T3 on the channel between the first switch unit and the analog-to-digital conversion circuit 40, and the touch electrode in the second touch electrode group 202 is connected to the third transistor T3 on the channel between the first switch unit and the analog-to-digital conversion circuit 40 under the action of the control signals SC1 and SC2, and the analog-to-digital conversion circuit 40 sequentially reads the signals stored on the storage capacitors CH. So far, all touch electrodes in the first touch area 101 are scanned, and the analog-to-digital conversion circuit 40 generates touch information respectively to realize a touch function.
It should be noted that, in this embodiment, only two sets of touch electrode sets are used, and each set of touch electrode sets includes two rows of touch electrodes as an example to illustrate the driving principle.
The embodiment of the invention also provides a display device which can comprise touch display electronic products such as a mobile phone, a tablet, a notebook and the like. Fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 2 to fig. 9, the display device 400 includes a touch panel according to any embodiment of the present invention, and a control circuit 30 and an analog-to-digital conversion circuit 40 are integrated in a driving chip; or the first switch unit 31 is integrated in the touch panel, and the touch sensing analog front end circuit 32, the storage circuit 33 and the analog-to-digital conversion circuit 40 are integrated in the driving chip; the switching timing control circuit 200 may also be integrated within the driver chip. The first switch unit 31 may be disposed in the non-display area, disposed in the fan-out area of the touch trace, and fabricated together with the array substrate to reduce the number of masks, and the driving chip may be disposed on the flip chip film so as to be bent to the back surface of the touch panel. Since the display device 400 provided in this embodiment includes the touch panel provided in any of the above embodiments, the display device 400 provided in this embodiment also has the beneficial effects described in any of the above embodiments.
The embodiment of the invention also provides a driving method of a touch panel, and fig. 10 is a flowchart of the driving method of the touch panel provided by the embodiment of the invention, and referring to fig. 2 to fig. 10, the touch panel includes at least one touch area 100; the touch area 100 includes a plurality of touch electrodes 10, and the plurality of touch electrodes 10 are divided into at least two touch electrode groups; the touch panel further includes: at least two groups of control circuits 30, wherein the control circuits 30 are in one-to-one correspondence with the touch electrode groups, and the control circuits 30 are connected with the touch electrodes 10 in the corresponding touch electrode groups through touch wiring; the control circuit 30 includes a plurality of first switch units 31, a touch sensing analog front end circuit 32, and a memory circuit 33; the first switching units 31 of the same set of control circuits 30 are configured to be turned on in a time-sharing manner, and at least part of the first switching units 31 of different sets of control circuits 30 are configured to be turned on simultaneously; the touch sensing analog front end circuit 32 is used for reading the signal of the touch electrode 10 during the on period of the first switch unit 31 and outputting the signal to the storage circuit 33 for storage; the analog-to-digital conversion circuit 40, the analog-to-digital conversion circuit 40 is connected to the memory circuit 33, and is used for time-sharing reading the signals stored in the memory circuit 33 in each group of control circuits 30.
The driving method of the touch panel comprises the following steps:
s110, conducting the first switch units of the same group of control circuits in a time-sharing way, conducting at least part of the first switch units of different groups of control circuits at the same time, reading signals of the touch electrodes by the touch sensing analog front-end circuit in a switch conducting period, and outputting the signals to the storage circuit for storage.
S120, the analog-digital conversion circuit reads signals stored in the storage circuits in each group of control circuits in a time-sharing mode.
In this embodiment, the touch panel may be divided into a plurality of touch areas 100, for example, two touch areas 100, namely, a first touch area 101 and a second touch area 102. The first touch area 101 corresponds to the left half screen of the touch panel, the second touch area 102 corresponds to the right half screen of the touch panel, and the first touch area 101 and the second touch area 102 scan simultaneously in the same scanning mode. The following embodiments are all described by taking the first touch area 101 as an example.
In this embodiment, a touch area 100 includes two touch electrode sets, and each touch electrode set is correspondingly connected to a set of control circuits 30, that is, the touch electrodes 10 in the first touch electrode set 201 are connected to the first control circuit 301 through touch traces, and the touch electrodes 10 in the second touch electrode set 202 are connected to the second control circuit 302 through touch traces. The control circuit 30 is configured to provide a driving signal to the touch electrode in the touch area 100 and read the touch signal of the touch electrode 10. Each control circuit 30 includes a plurality of first switch units 31 and a touch sensing analog front end circuit 32, and the first switch units 31 are used for turning on or off the conductive channels of the touch electrodes 10. The touch sensing analog front end circuit 32 is configured to read a sensing signal of the touch electrode, and the analog-to-digital conversion circuit 40 reads the sensing signal and performs analog-to-digital conversion on the sensing signal to generate touch information, thereby completing the touch scanning function. The plurality of first switch units 31 in the first group control circuit 301 conduct the touch electrodes 10 in the first touch electrode group 201 in a time-sharing manner, and the first switch units 31 in the first group control circuit 301 and the second group control circuit 302 conduct simultaneously, so that part of the touch electrodes 10 in the first group touch electrode group 201 and the second group touch electrode group 202 scan simultaneously.
In the prior art, the first touch area 101 corresponds to a set of control circuits 30, and touch electrodes in the touch panel are scanned row by row, and the time required for completing the scanning of the first touch area 101 is t. In this embodiment, the touch electrodes 10 in the first touch area 101 are divided into two groups of touch electrode groups, each group of touch electrode groups corresponds to one group of control circuits 30, and part of the first switch units 31 in the two groups of control circuits 30 are turned on simultaneously, that is, the two groups of touch electrode groups scan simultaneously, so that the time required for completing the scanning of the first touch area 101 is t/2. The saved time t/2 may be further scanned for the first touch area 101 to increase the touch report rate of the first touch area 101. Or the saved time t/2 is used for displaying, the refresh rate of the touch panel can be improved without changing the touch point reporting rate of the touch area 100, and the display effect of the touch panel can be further improved.
Since the number of the first switch units 31 and the touch sensing analog front end circuits 32 is increased in this embodiment, in order to reduce the design difficulty of the circuit and save space, the storage circuits 33 are added corresponding to the touch sensing analog front end circuits 32 in the control circuit 30 to store the touch electrode signals read by the touch sensing analog front end circuits 32 during the on period of the corresponding first switch units 31, and then the analog-to-digital conversion circuits 40 time-share the touch electrode signals stored in each touch electrode group in the storage circuits 33. By the technical scheme, the reading of the touch electrode signals in the plurality of groups of touch electrode groups can be realized under the condition that the analog-to-digital conversion circuit 40 is not added, and the design of the circuit is facilitated.
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 (10)

1. The touch panel is characterized by comprising at least one touch area; the touch area comprises a plurality of touch electrodes, and the touch electrodes are divided into at least two touch electrode groups;
The touch panel further includes:
the control circuits are in one-to-one correspondence with the touch electrode groups, and are connected with the corresponding touch electrodes in the touch electrode groups through touch wires; the control circuit comprises a plurality of first switch units, a touch sensing analog front-end circuit and a storage circuit; the first switch units of the same group of the control circuits are configured to be turned on in a time-sharing manner, and at least part of the first switch units of different groups of the control circuits are configured to be turned on simultaneously; the touch sensing analog front-end circuit is used for reading signals of the touch electrode during the conduction period of the first switch unit and outputting the signals to the storage circuit for storage;
the analog-to-digital conversion circuit is connected with the storage circuit and used for time-sharing reading signals stored by the storage circuit in each group of control circuits;
The storage circuit comprises a storage capacitor, a second switch unit and a third switch unit; the second switch unit is connected between the first end of the storage capacitor and the touch sensing analog front-end circuit, the second end of the storage capacitor is connected with a reference voltage, and the third switch unit is connected between the first end of the storage capacitor and the analog-to-digital conversion circuit;
For the first switch unit, the second switch unit and the third switch unit which are connected to the same channel between the touch electrode and the analog-to-digital conversion circuit, the second switch unit is conducted at least once during the conduction period of the first switch unit, and the third switch unit is conducted after the first switch unit is turned off.
2. The touch panel according to claim 1, wherein the plurality of touch electrodes are arranged in an array, the at least two touch electrode groups are arranged in parallel along a row direction, each touch electrode group comprises at least two rows of touch electrodes, the touch electrodes in each touch electrode group are connected with a first end of the first switch unit in a one-to-one correspondence manner through touch wirings, and a second end of the first switch unit connected with the touch electrodes in the same row in the same touch electrode group is connected with a touch sensing analog front-end circuit.
3. The touch panel according to claim 1, wherein,
At least two touch sensing analog front-end circuits are connected with the same analog-to-digital conversion circuit through corresponding storage circuits.
4. The touch panel of claim 1, wherein the touch electrodes in the same row are connected to the same analog-to-digital conversion circuit.
5. A touch panel according to claim 3, wherein the first switch units connected to the touch electrodes of the same column in the same group of touch electrodes are turned on or off simultaneously.
6. The touch panel of claim 1, wherein the scan directions of the touch electrodes in the first and last sets of touch electrodes are opposite.
7. The touch panel of claim 6, wherein the 2k+1 group of touch electrodes is opposite to the scan direction of the touch electrodes in the 2k+2 group of touch electrodes, wherein k is an integer greater than or equal to 0.
8. The touch panel according to claim 1, wherein,
The first switching unit includes a first transistor, the second switching unit includes a second transistor, and the third switching unit includes a third transistor.
9. A display device comprising the touch panel according to any one of claims 1 to 8, the control circuit and the analog-to-digital conversion circuit being integrated in a driver chip;
or the first switch unit is integrated in the touch panel, and the touch sensing analog front-end circuit, the storage circuit and the analog-to-digital conversion circuit are integrated in the driving chip.
10. The driving method of the touch panel is characterized in that the touch panel comprises at least one touch area; the touch area comprises a plurality of touch electrodes, and the touch electrodes are divided into at least two touch electrode groups;
The touch panel further includes:
the control circuits are in one-to-one correspondence with the touch electrode groups, and are connected with the corresponding touch electrodes in the touch electrode groups through touch wires; the control circuit comprises a plurality of first switch units, a touch sensing analog front-end circuit and a storage circuit; the first switch units of the same group of the control circuits are configured to be turned on in a time-sharing manner, and at least part of the first switch units of different groups of the control circuits are configured to be turned on simultaneously; the touch sensing analog front-end circuit is used for reading signals of the touch electrode during the conduction period of the first switch unit and outputting the signals to the storage circuit for storage;
the analog-to-digital conversion circuit is connected with the storage circuit and used for time-sharing reading signals stored by the storage circuit in each group of control circuits;
The storage circuit comprises a storage capacitor, a second switch unit and a third switch unit; the second switch unit is connected between the first end of the storage capacitor and the touch sensing analog front-end circuit, the second end of the storage capacitor is connected with a reference voltage, and the third switch unit is connected between the first end of the storage capacitor and the analog-to-digital conversion circuit;
the driving method of the touch panel comprises the following steps:
The first switch units of the same group of control circuits are conducted in a time sharing mode, at least part of the first switch units of different groups of control circuits are conducted at the same time, and the touch sensing analog front-end circuit reads signals of the touch electrodes during the conduction period of the first switch units and outputs the signals to the storage circuit for storage;
the analog-to-digital conversion circuit reads signals stored by the storage circuits in each group of control circuits in a time-sharing manner;
The first switch unit, the second switch unit and the third switch unit are connected to a channel between the same touch electrode and the analog-to-digital conversion circuit, wherein the second switch unit is conducted at least once during the conduction period of the first switch unit, and the third switch unit is conducted after the first switch unit is turned off.
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