CN111897450B - Capacitive touch module, control method thereof and touch display screen - Google Patents
Capacitive touch module, control method thereof and touch display screen Download PDFInfo
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- CN111897450B CN111897450B CN202010679943.7A CN202010679943A CN111897450B CN 111897450 B CN111897450 B CN 111897450B CN 202010679943 A CN202010679943 A CN 202010679943A CN 111897450 B CN111897450 B CN 111897450B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 238000003491 array Methods 0.000 claims description 2
- 239000002356 single layer Substances 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 16
- 230000008859 change Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000000630 rising effect Effects 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000008447 perception Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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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
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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
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
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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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0448—Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04102—Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04112—Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
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- General Engineering & Computer Science (AREA)
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- Position Input By Displaying (AREA)
Abstract
The invention provides a capacitive touch module, a control method thereof and a touch display screen, which solve the problem of high cost caused by more pins of a control chip required when the capacitive touch module adopts a touch pad with a single-layer electrode in the prior art. The capacitive touch module comprises: a touch panel including at least one electrode unit group, each electrode unit group including a plurality of electrode units, each electrode unit including a detection terminal; the control chip comprises at least one first pin which is in one-to-one correspondence with at least one electrode unit group; and a timing control circuit connected between the touch panel and the control chip; the time sequence control circuit is used for sequentially conducting detection terminals of a plurality of electrode units in the same electrode unit group with the same first pin of the control chip.
Description
Technical Field
The invention relates to the technical field of touch control, in particular to a capacitive touch control module, a control method thereof and a touch control display screen.
Background
In order to realize the touch function of the display screen, a touch panel is generally stacked on the display panel, and a corresponding control circuit is provided for the touch panel. The related art touch panel includes two types of double-layer electrodes and single-layer electrodes. For a touch pad with a single layer electrode, more pins of the control chip are required, resulting in higher cost.
Disclosure of Invention
In view of the above, the embodiments of the present invention are directed to providing a capacitive touch module, a control method thereof, and a touch display screen, so as to solve the problem of high cost caused by more pins of a control chip required by a touch panel with a single-layer electrode in the prior art.
The first aspect of the present invention provides a capacitive touch module, including: a touch panel including at least one electrode unit group, each electrode unit group including a plurality of electrode units, each electrode unit including a detection terminal; the control chip comprises at least one first pin which is in one-to-one correspondence with at least one electrode unit group; and a timing control circuit connected between the touch panel and the control chip; the time sequence control circuit is used for sequentially conducting detection terminals of a plurality of electrode units in the same electrode unit group with the same first pin of the control chip.
In one embodiment, a timing control circuit includes a control unit and a switching unit; the control unit comprises a plurality of first output terminals, and the switch unit comprises a plurality of first switches; the detection terminals of a plurality of electrode units in the same electrode unit group are sequentially connected with the same first pin of the control chip through a plurality of first switches, and the control ends of the plurality of first switches are sequentially connected with a plurality of first output terminals of the control unit.
In one embodiment, the switching unit further comprises at least one second switch, each electrode unit further comprises a drive terminal, and the control chip further comprises a second pin; the driving terminals of the electrode units in the at least one electrode unit group are respectively connected with a second pin of the control chip through at least one second switch.
In one embodiment, the timing control circuit further includes a second output terminal; the control end of at least one second switch is respectively connected with the second output terminal.
In one embodiment, the control unit comprises a plurality of sequentially arranged control subunits; each control subunit comprises a clock signal end, a first input end, a second input end and an output end; the clock signal ends of the odd-numbered control subunits are connected with the first clock signal line, and the clock signal ends of the even-numbered control subunits are connected with the second clock signal line; the output end of the former control subunit is connected with the first input end of the latter control subunit, and the output end of the latter control subunit is connected with the second input end of the former control subunit.
In one embodiment, the control subunit includes a shift register, a first transistor, and a second transistor, the first transistor and the second transistor including a control terminal, a first terminal, and a second terminal, respectively; the shift register comprises a first input end, a second input end, a first output end and a second output end, wherein the first output end is connected with the control end of the first transistor; the first end of the first transistor forms a clock signal end, and the second end of the first transistor forms an output end; the first end of the second transistor is connected with the second end of the first transistor, and the second end of the second transistor is connected with an external low level.
The second aspect of the present invention provides a control method of a capacitive touch module, which is used for the capacitive touch module provided by any one of the embodiments. The control method comprises the following steps: the detection terminals for controlling the plurality of electrode units in the same electrode unit group are sequentially conducted with the same first pin of the control chip.
In one embodiment, the at least one electrode unit group includes a plurality of electrode unit groups; the plurality of electrode units in each electrode unit group are arranged in a row, and the plurality of electrode unit groups are arranged in parallel to form an electrode unit array. Controlling the detection terminals of a plurality of electrode units in the same electrode unit group to be sequentially conducted with the same first pin of the control chip comprises: the row-by-row control electrode unit array is respectively communicated with at least one first pin of the control chip.
In one embodiment, each electrode unit further comprises a drive terminal, and the control chip further comprises a second pin. Before the detection terminals for controlling the plurality of electrode units in the same electrode unit group are sequentially conducted with the same first pin of the control chip, the method further comprises the following steps: the driving terminal of each electrode unit is controlled to be respectively conducted with the second pin of the control chip so as to initialize the potential of each electrode unit.
A third aspect of the present invention provides a touch display screen, including: any one of the embodiments provides a capacitive touch module; and a display panel overlapped with the touch panel.
According to the capacitive touch module, the control method thereof and the touch display screen provided by the embodiment of the invention, the touch pad in the capacitive touch module is provided with the single-layer electrode, the time sequence control circuit is added between the touch pad and the control chip, and the time sequence control circuit is used for controlling the plurality of electrode units in the same electrode unit group to be in time-sharing connection with the same first pin on the control chip, so that the number of the first pins required on the control chip is reduced, the occupied space of the control chip is further saved, and the cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a capacitive touch module according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a capacitive touch module according to a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a capacitive touch module according to a third embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a capacitive touch module according to a fourth embodiment of the invention.
Fig. 5 is a schematic structural diagram of a control unit in the capacitive touch module shown in fig. 4 according to an embodiment of the invention.
Fig. 6 is a schematic structural diagram of a control subunit in the control unit shown in fig. 5 according to an embodiment of the present invention.
Fig. 7 is a control timing diagram of the capacitive touch module shown in fig. 4 according to an embodiment of the invention.
Fig. 8 is a flowchart illustrating a control method of a capacitive touch module according to an embodiment of the invention.
Fig. 9 is a block diagram of a flexible touch display screen according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic structural diagram of a capacitive touch module according to a first embodiment of the present invention. As shown in fig. 1, the capacitive touch module 100 includes a touch pad 10, a control chip 20 and a timing control circuit 30. Wherein the touch panel 10 includes at least one electrode unit group 11, each electrode unit group 11 includes a plurality of electrode units 110, and each electrode unit 110 includes a detection terminal 111. The control chip 20 includes at least one first pin 21 in one-to-one correspondence with at least one electrode unit group 11. The timing control circuit 30 is connected between the touch panel 10 and the control chip 20, and is configured to sequentially turn on the detection terminals 111 of the plurality of electrode units 110 in the same electrode unit group 11 to the same first pin 21 of the control chip 20.
The process of the timing control circuit 30 sequentially turning on the detection terminals 111 of the plurality of electrode units 110 in the same electrode unit group 11 and the same first pin 21 of the control chip 20 is to scan the electrode units 110 in the same electrode unit group 11, and the time of turning on all the electrode units 110 in the same electrode unit group 11 once is one scan period. In this case, one scan period includes a plurality of time periods corresponding to the plurality of electrode units 110 one by one.
Specifically, for example, the touch panel 10 includes one electrode unit group 11, and at this time, the control chip 20 includes one first pin 21. The timing control circuit 30 sequentially conducts the plurality of electrode units 110 in the electrode unit group 11 with the first pin 21 by time-sharing control, that is, sequentially scans the plurality of electrode units 110, and the time required for all conducting the plurality of electrode units 110 once is one scanning period, and the conducting time of each electrode unit 110 corresponds to one time period in the scanning period.
In the present embodiment, each electrode unit 110 has an initial potential. In a scanning period, when a finger touches one of the electrode units 110, because the finger is grounded, the potential of the touched electrode unit 110 will be changed after the finger touches the electrode unit 110, the potential change will be sensed by the first pin 21 of the control chip 20 during the scanning process, and the control chip 20 records the corresponding scanning time period when the potential change is sensed, and the corresponding electrode unit 110 can be determined by using the scanning time period, thereby realizing the positioning of the touched electrode unit 110.
As another example, as shown in fig. 1, the touch panel 10 includes a 4×3 electrode unit array, each column being one electrode unit group 11, i.e., the touch panel 10 includes three electrode unit groups 11, each electrode unit group 11 including four electrode units 110. At this time, the control chip 20 includes three first pins 21, and the scanning period of the timing control circuit 30 includes four periods. In the first period, the timing control circuit 30 controls the first row electrode units 110 to be respectively turned on with the three first pins 21; in the second period, the timing control circuit 30 controls the second row electrode units 110 to be respectively turned on with the three first pins 21; in a third period, the timing control circuit 30 controls the third row electrode units 110 to be respectively turned on with the three first pins 21; in the fourth period, the timing control circuit 30 controls the fourth row electrode units 110 to be respectively turned on with the three first pins 21.
In this case, each electrode unit 110 has an initial potential. In a scanning period, when a finger touches one of the electrode units 110, because the finger is grounded, the potential of the touched electrode unit 110 will be changed after the finger touches the electrode unit 110, the potential change will be sensed by a certain pin 21 of the control chip 20 during the scanning process, and the control chip 20 records the corresponding scanning time period when the potential change is sensed, so that the pin 21 can be used to determine the column where the touched electrode unit 110 is located, and the scanning time period can be used to determine the touched electrode unit 110 in the column conducted with the pin, thereby realizing the positioning of the touched electrode unit 110.
It can be seen that the capacitive touch module provided according to the present embodiment uses the combination of the pins 21 and the scanning timing to locate the touched electrode unit 110, that is, the location of the touched electrode unit 110 is irrelevant to the location of the electrode unit 110 in the touch process. Accordingly, the arrangement position of the plurality of electrode units 110 in the at least one electrode unit group 11 may be arbitrary, for example, the plurality of electrode units 110 may be sequentially arranged in a row or in a line, and for example, the plurality of electrode units 110 may be arranged at intervals, or the like.
According to the capacitive touch module provided by the embodiment, the capacitive touch module is equivalent to a single-layer self-capacitance touch screen, and the time sequence control circuit is added between the touch pad and the control chip and is used for controlling the plurality of electrode units to be connected with the same pin on the control chip in a time-sharing manner, so that the number of first pins required on the control chip is reduced, the occupied space of the control chip is further saved, and the cost is saved.
Fig. 2 is a schematic structural diagram of a capacitive touch module according to a second embodiment of the present invention. As shown in fig. 2, in the present embodiment, the timing control circuit30 comprises a control unit and a switch unit, the control unit comprises a plurality of first output terminals G n (n=1, 2,3 … …), the switching unit comprising a plurality of first switches K mn (m=1, 2,3 … …). The detection terminals 111 of the plurality of electrode units 110 in the same electrode unit group 11 sequentially pass through the plurality of first switches K mn A plurality of first switches K connected to the same first pin 21 of the control chip 20 mn The control terminals of the control unit are sequentially connected with a plurality of first output terminals G n (n＝1,2,3……)。
It should be noted that, for a switch, a first terminal and a second terminal are generally included, and a control terminal is generally included. The first end and the second end are respectively connected with two circuit units or components to be connected, and the control end is used for controlling the connection and disconnection between the first end and the second end.
Specifically, as shown in fig. 2, the detection terminal 111 of each electrode unit 110 passes through the first switch K mn One first pin 21 of the control chip 20 is connected, and all the electrode units 110 in the same electrode unit group 11 are connected to the same first pin 21. A plurality of first switches K for connecting all the electrode units 110 in the same electrode unit group 11 mn Is divided into a switch group, a first switch K in the same switch group mn A plurality of first output terminals G of the control unit are sequentially connected to the control terminals of n 。
Taking the touch panel 10 including a 4×3 electrode unit array as an example, as shown in fig. 2, the control unit includes four first output terminals G 1 -G 4 . The switch unit comprises 12 first switches K mn 12 first switches K mn Is divided into 3 switch groups on average, the three switch groups respectively corresponding to three electrode unit groups 11, namely 3 columns of electrode units. The first row electrode unit sequentially passes through the first switch group K 11 -K 14 A first pin 21 connected to the control chip 20, a first switch group K 11 -K 14 Four first output terminals G of the control unit are sequentially connected to the control terminal of the control unit 1 -G 4 . The second row electrode unit sequentially passes through the second switch group K 21 -K 24 Connect to the first of the control chip 20Two first pins 21, a second switch group K 21 -K 24 Four first output terminals G of the control unit are sequentially connected to the control terminal of the control unit 1 -G 4 . The third row electrode unit sequentially passes through a third switch group K 31 -K 34 A third first pin 21 connected to the control chip 20, a third switch group K 31 -K 34 Four first output terminals G of the control unit are sequentially connected to the control terminal of the control unit 1 -G 4 。
According to the capacitive touch module provided by the embodiment, the control unit is used for providing the switching time sequence and controlling the time-sharing conduction of the switching unit, so that the time-sharing scanning of the electrode units 110 in the touch pad 10 is realized, and therefore, one electrode unit 110 can be accurately positioned by using the first pin 21 and the conduction time sequence, and the capacitive touch module is simple in structure and easy to realize.
Fig. 3 is a schematic structural diagram of a capacitive touch module according to a third embodiment of the present invention. As shown in fig. 3, in the present embodiment, the capacitive touch module 300 further includes at least one second switch Q compared to the capacitive touch module 200 shown in fig. 2 mn Each electrode unit 110 further comprises a drive terminal 112, and the control chip 20 further comprises a second pin 22. The drive terminals 112 of the electrode units 110 in the at least one electrode unit group 11 are each connected via at least one second switch Q mn A second pin 22 of the control chip 20 is connected.
Taking the touch panel 10 including a 4×3 electrode unit array as an example, as shown in fig. 3, the switch unit further includes 12 second switches Q mn Each electrode unit 110 passes through one Q mn The second pin 22 is connected. In this case, all the second switches Q in the switching unit mn Are open. For a second switch Q mn In other words, in the case of disconnection, i.e. in the case of no voltage on the control terminal, the first terminal and the second terminal correspond to two stages of capacitance. When the second pin 22 of the control chip 20 is used as the second switch Q mn When the first terminal is injected with a potential, an induced potential is generated at the second terminal, so as to initialize the potential of the electrode unit 110 connected with the second terminal for subsequent touch detection.
Fig. 4 is a schematic structural diagram of a capacitive touch module according to a fourth embodiment of the invention. As shown in fig. 4, in the capacitive touch module 400 of the present embodiment, the control unit in the timing control circuit 30 further includes a second output terminal G, relative to the capacitive touch module 300 of fig. 3 0 At least one second switch Q mn The control terminals of (a) are respectively connected with the second output terminal G 0 。
Taking the touch panel 10 including the 4×3 electrode unit array as an example, as shown in fig. 4, 12 second switches Q mn The control terminals of (a) are connected with the second output terminal G 0 . Specifically, 12 second switches Q mn Is divided into three switch groups, i.e. a first and a second switch group Q 1n Second switch group Q 2n Third second switch group Q 3n . Each switch group corresponds to a column of electrode units 110. Four second switches Q in each switch group mn Is integrally formed with the control terminal of the first output terminal G and then connected to the second output terminal G 0 。
In this case, the second output terminal G is used 0 Controlling at least one second switch Q mn Conduction is performed to directly apply the potential of the second pin 22 of the control chip 20 to all the electrode units 110, thereby achieving potential initialization of all the electrode units 110. At the same time, the second output terminal G 0 Control of the second switch Q mn The time of conduction can be sensed by the control chip 20, the control chip 20 starts timing, marks the start of a scanning period, and provides a time sequence during touch positioning, and the time sequence can be used for determining one electrode unit 110 touched in one electrode unit group 11 connected with the same first pin 21, so as to realize the touch positioning function.
Fig. 5 is a schematic structural diagram of a control unit in the capacitive touch module shown in fig. 4 according to an embodiment of the invention. As shown in fig. 5, the control unit 30 includes a plurality of control sub-units 31 arranged in sequence, and each control sub-unit 31 includes a clock signal terminal CK, a first input terminal Set, a second input terminal Reset, and an output terminal Out. The clock signal terminals CK of the odd-numbered control sub-units 31 are connected to the first clock signal line CK1, and the clock signal terminals CK of the even-numbered control sub-units 31 are connected to the second clock signal line CK2. The output Out of the previous control subunit 31 is connected to the first input Set of the next control subunit 31 and the output Out of the next control subunit 31 is connected to the second input Reset of the previous control subunit 31.
For each control subunit 31, as shown in fig. 6, a schematic diagram of a control subunit in the control unit shown in fig. 5 according to an embodiment of the present invention is shown, where the control subunit 31 includes a shift register 310, a first transistor T1, and a second transistor T2. The first transistor T1 and the second transistor T2 include a control terminal, a first terminal, and a second terminal, respectively. The shift register 310 includes a first input terminal Set, a second input terminal Reset, and a first output terminal Q and a second output terminal QB, wherein the first output terminal Q is connected to the control terminal of the first transistor T1, and the second output terminal QB is connected to the control terminal of the second transistor T2. The first terminal of the first transistor T1 forms the clock signal terminal CK, and the second terminal of the first transistor T1 forms the output terminal Out. The first terminal of the second transistor T2 is connected to the second terminal of the first transistor T1, and the second terminal of the second transistor T2 is connected to the external low level Vss.
Fig. 7 is a control timing diagram of the capacitive touch module shown in fig. 4 according to an embodiment of the invention. As shown in fig. 7, the first clock signal line CK1 and the second clock signal line CK2 turn on the first clock signal and the second clock signal, respectively. The duration T of each rectangular pulse in the first clock signal is equal to the time interval D of two adjacent rectangular pulses. The second clock signal is one rectangular pulse behind the first clock signal, and the second clock signal and the first clock signal do not overlap in time sequence. In this case, in one control period, the following operations are performed:
in a first time period t 1 At the rising edge of the first pulse signal of the first clock signal, a rectangular pulse signal, i.e. the power-up signal STP, is applied to the first input Set of the first control subunit 31.
During a second time period t 2 On the falling edge of the first pulse signal of the first clock signal, i.e. on the first pulse signal of the second clock signalA rising edge, a second output terminal G of the control unit 0 Outputting a rectangular pulse signal. Second output terminal G 0 The output rectangular pulse signal causes three second switches in the switch unit, namely a first second switch Q 11 Second switch Q 21 Third second switch Q 31 All are conducted, so that the driving terminals 112 of all the electrode units 110 are respectively conducted with the second pins 22 of the control chip 20, and the electric potentials of the second pins 22 are respectively applied to all the electrode units 110, thereby realizing the electric potential initialization of the electrode units 110. At the same time, the control chip 20 records the on-time of the three second switches as the start time of one scan period.
In a third time period t 3 A first output terminal G of the control unit at a rising edge of the second pulse signal of the first clock signal, i.e. a falling edge of the first pulse signal of the second clock signal 1 Outputting a rectangular pulse signal. First output terminal G 1 The output rectangular pulse signal controls the detection terminals 111 of the electrode units 110 of the first row to be respectively turned on with the three first pins 21 of the control chip 20 to scan whether there is a potential change in the electrode units 110 of the first row.
In the fourth time period t 4 At the falling edge of the second pulse signal of the first clock signal, i.e. the rising edge of the second pulse signal of the second clock signal, the second first output terminal G of the control unit 2 Outputting a rectangular pulse signal. Second first output terminal G 2 The output rectangular pulse signal controls the detection terminals 111 of the electrode units 110 of the second row to be respectively turned on with the three first pins 21 of the control chip 20 to scan whether there is a potential change in the electrode units 110 of the second row.
In a fifth time period t 5 At the rising edge of the third pulse signal of the first clock signal, i.e. the falling edge of the second pulse signal of the second clock signal, the third first output terminal G of the control unit 3 Outputting a rectangular pulse signal. Third first output terminal G 3 The output rectangular pulse signal controls the third row electrode unit 110The detection terminals 111 are respectively turned on with the three first pins 21 of the control chip 20 to scan whether or not there is a potential change in the electrode units 110 of the third row.
In the sixth time period t 6 At the falling edge of the third pulse signal of the first clock signal, i.e. the rising edge of the third pulse signal of the second clock signal, the fourth first output terminal G of the control unit 4 Outputting a rectangular pulse signal. Fourth first output terminal G 4 The output rectangular pulse signal controls the detection terminals 111 of the fourth row electrode units 110 to be respectively turned on with the three first pins 21 of the control chip 20 to scan whether or not there is a potential change in the fourth row electrode units 110.
In the above control process, a row of electrode units 110 may be positioned according to the scanning timing sequence, and then, one electrode unit 110 in the row of electrode units 110 is positioned according to the first pin 21 of the control chip 20, so as to position the touched electrode unit, and further, realize the touch function.
The invention also provides a control method of the capacitive touch module. Fig. 8 is a flowchart illustrating a control method 800 of a capacitive touch module according to an embodiment of the invention. As shown in connection with fig. 8 and 1, the control method 800 includes:
in step S820, the detection terminals 111 of the plurality of electrode units 110 in the same electrode unit group 11 are controlled to be sequentially connected to the same first pin 21 of the control chip 20.
Further, for the capacitive touch module shown in fig. 3, the control method 800 further includes step S810 before step S820, where the driving terminal 112 of each electrode unit 110 is controlled to be respectively connected to the second pin 22 of the control chip 20, so as to perform potential initialization on each electrode unit 110.
In one embodiment, the at least one electrode unit group 11 includes a plurality of electrode unit groups 11. The plurality of electrode units 110 in each electrode unit group 11 are arranged in a row, and the plurality of electrode unit groups 11 are arranged in parallel to form an electrode unit array. In this case, step S720 is specifically performed as: the row-by-row control electrode unit arrays are respectively conducted with at least one first pin 21 of the control chip 20.
It should be understood that, for the control method of the capacitive touch module provided in any of the foregoing embodiments, the step S820 is performed once to obtain a scanning period, and the length of the scanning period may be set reasonably according to the actual situation. Meanwhile, the capacitive touch module can be used for realizing multi-point touch only by controlling the scanning frequency to be larger than the human perception speed, namely the time for completing one scanning process is smaller than the human perception time.
The invention also provides a touch display screen, and the structural block diagram of the touch display screen is shown in fig. 9. Referring to fig. 9, the touch display screen 90 includes a capacitive touch module 91 and a display panel 92 stacked with the touch panel according to any of the above embodiments. The touch display screen 90 corresponds to a single-layer self-capacitance touch display screen, and can accurately position the touched electrode to realize a touch function.
In one embodiment, the touch display screen as shown in fig. 9 is a flexible touch display screen. For the flexible touch display screen, if the touch panel with the double-layer electrode is adopted, the stress problem and the bending service life problem of the double-layer electrode in the bending process of the flexible touch display screen are difficult to solve, so that the flexible touch display screen is more suitable for the touch panel with the single-layer electrode. The touch panel in the capacitive touch module 91 in the touch display screen 90 has a single-layer electrode, so that the problems of stress release and bending life caused by the double-layer electrode can be well avoided. That is, the capacitive touch module according to any embodiment of the present invention is particularly suitable for a flexible touch display.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (6)
1. The utility model provides a capacitive touch module which characterized in that includes:
a touch panel including at least one electrode unit group, each electrode unit group including a plurality of electrode units, each electrode unit including a detection terminal;
the control chip comprises at least one first pin which is in one-to-one correspondence with the at least one electrode unit group; and
a timing control circuit connected between the touch panel and the control chip;
the time sequence control circuit is used for sequentially conducting the detection terminals of a plurality of electrode units in the same electrode unit group with the same first pin of the control chip;
the time sequence control circuit comprises a control unit and a switch unit; the control unit includes a plurality of first output terminals, and the switching unit includes a plurality of first switches;
the detection terminals of the electrode units in the same electrode unit group are sequentially connected with the same first pin of the control chip through a plurality of first switches, and the control ends of the first switches are sequentially connected with the first output terminals of the control unit;
the switch unit further comprises a plurality of second switches, each electrode unit further comprises a driving terminal, and the control chip further comprises a second pin;
the driving terminals of the electrode units in the at least one electrode unit group are respectively connected with the second pins of the control chip through a plurality of second switches;
the timing control circuit further comprises a second output terminal;
all control ends of the second switches are connected with the same second output terminal;
controlling at least one second switch to be conducted by utilizing the second output terminal so as to directly apply the potential of the second pin of the control chip to all electrode units, and initializing the potential of each electrode unit; meanwhile, the time of the second output terminal controlling the second switch to be turned on can be sensed by the control chip, and the control chip starts timing and marks the beginning of a scanning period so as to provide time sequence during touch positioning.
2. The capacitive touch module according to claim 1, wherein the control unit comprises a plurality of control subunits arranged in sequence; each control subunit comprises a clock signal end, a first input end, a second input end and an output end; the clock signal ends of the odd-numbered control subunits are connected with a first clock signal line, and the clock signal ends of the even-numbered control subunits are connected with a second clock signal line; the output end of the former control subunit is connected with the first input end of the latter control subunit, and the output end of the latter control subunit is connected with the second input end of the former control subunit.
3. The capacitive touch module of claim 2, wherein the control subunit comprises a shift register, a first transistor, and a second transistor, the first transistor and the second transistor comprising a control terminal, a first terminal, and a second terminal, respectively;
the shift register comprises a first input end, a second input end, a first output end and a second output end, wherein the first output end is connected with the control end of the first transistor, and the second output end is connected with the control end of the second transistor;
a first end of the first transistor forms the clock signal end, and a second end of the first transistor forms the output end;
the first end of the second transistor is connected with the second end of the first transistor, and the second end of the second transistor is connected with an external low level.
4. A control method of a capacitive touch module, which is characterized by being used for the capacitive touch module of any one of claims 1-3;
the control method comprises the following steps:
the detection terminals of a plurality of electrode units in the same electrode unit group are controlled to be sequentially communicated with the same first pin of the control chip;
the at least one electrode unit group includes a plurality of electrode unit groups; the electrode units in each electrode unit group are arranged in a row, and the electrode unit groups are arranged in parallel to form an electrode unit array; each electrode unit further comprises a driving terminal, and the control chip further comprises a second pin;
before the detection terminals for controlling the plurality of electrode units in the same electrode unit group are sequentially conducted with the same first pin of the control chip, the method further comprises:
the driving terminal of each electrode unit is controlled to be respectively conducted with the second pin of the control chip so as to initialize the potential of each electrode unit.
5. The method of claim 4, wherein,
the controlling the detection terminals of the plurality of electrode units in the same electrode unit group to be sequentially conducted with the same first pin of the control chip includes:
and controlling the electrode unit arrays to be respectively conducted with at least one first pin of the control chip row by row.
6. A touch display screen, comprising:
a capacitive touch module according to any one of claims 1-3; and
and a display panel overlapped with the touch panel.
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