CN108897459B - Touch detection method of touch screen, touch capacitance, touch screen and electronic device - Google Patents
Touch detection method of touch screen, touch capacitance, touch screen and electronic device Download PDFInfo
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- CN108897459B CN108897459B CN201811012670.XA CN201811012670A CN108897459B CN 108897459 B CN108897459 B CN 108897459B CN 201811012670 A CN201811012670 A CN 201811012670A CN 108897459 B CN108897459 B CN 108897459B
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- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims abstract description 168
- 230000008859 change Effects 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000000295 complement effect Effects 0.000 claims abstract description 11
- 230000007423 decrease Effects 0.000 claims abstract description 7
- 230000006698 induction Effects 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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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
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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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
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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
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
Abstract
The invention relates to the field of capacitive touch screens, and discloses a touch detection method and a touch capacitor of a touch screen, wherein the touch screen comprises a first sensing electrode, a second sensing electrode and a third sensing electrode, the first sensing electrode and the third sensing electrode are arranged in a differential complementary symmetrical mode, the second sensing electrode is arranged between the first sensing electrode and the third sensing electrode, when the touch screen slides on the touch screen, a first equivalent capacitor is formed between the first sensing electrode and the second sensing electrode, a second equivalent capacitor is formed between the third sensing electrode and the second sensing electrode, the first equivalent capacitor increases progressively according to a preset direction, and the second equivalent capacitor decreases progressively according to the preset direction; when the touch screen slides, determining the change of capacitance values of the first equivalent capacitance and the second equivalent capacitance; according to the change of the capacitance values of the first equivalent capacitance and the second equivalent capacitance, the touch direction is determined, and by adopting the method, the waterproof and electromagnetic interference preventing capacities of the capacitive sliding strip can be effectively improved.
Description
Technical Field
The present invention relates to the field of capacitive touch screens, and in particular, to a touch detection method for a touch screen, a touch capacitor, a touch screen, and an electronic device.
Background
In recent years, with the development of smart phones and tablet computers, the information input part is developed from the earliest contact type key to a non-contact type input mode, wherein the non-contact type input mode comprises a non-contact type key, a slide bar, a multi-point touch type mode and the like, and the non-contact type input mode is divided into various schemes such as photoelectric scheme, infrared scheme, electromagnetic scheme and capacitive scheme, and the development is faster at present.
Although capacitive runner solutions have been mature, their waterproof, tamper resistance has yet to be improved.
Disclosure of Invention
The embodiment of the invention provides a touch detection method of a touch screen, a touch capacitor, the touch screen and electronic equipment, and solves the technical problems of poor waterproof and anti-interference capabilities of an existing capacitive sliding strip.
In order to solve the technical problems, one technical scheme adopted by the embodiment of the invention is as follows:
in a first aspect, an embodiment of the present invention discloses a touch detection method for a touch screen, where the touch screen includes a first sensing electrode, a second sensing electrode, and a third sensing electrode, the second sensing electrode is disposed between the first sensing electrode and the third sensing electrode, the first sensing electrode and the third sensing electrode are disposed in a differential complementary symmetrical manner with respect to the second sensing electrode, and when the touch screen slides on the touch screen, a first equivalent capacitance is formed between the first sensing electrode and the second sensing electrode, a second equivalent capacitance is formed between the third sensing electrode and the second sensing electrode, the first equivalent capacitance increases in a preset direction, and the second equivalent capacitance decreases in the preset direction; the method comprises the following steps: determining a change in capacitance value of the first equivalent capacitance and the second equivalent capacitance when the touch screen slides; and determining the touch direction according to the change of the capacitance values of the first equivalent capacitance and the second equivalent capacitance.
Preferably, the determining the change in capacitance value of the first equivalent capacitance and the second equivalent capacitance includes: applying level signals to the first sensing electrode and the third sensing electrode to charge the first equivalent capacitor and the second equivalent capacitor respectively; recording a first charging time for the first equivalent capacitor to charge the touch screen to a preset voltage threshold value and a second charging time for the second equivalent capacitor to charge the touch screen to the preset voltage threshold value; and determining the change of the capacitance values of the first equivalent capacitance and the second equivalent capacitance according to the first charging time and the second charging time.
Preferably, the determining the touch direction according to the change of the capacitance value of the capacitance values of the first equivalent capacitance and the second equivalent capacitance includes: judging whether the first charging time is longer than the second charging time; if the touch direction is larger than the first direction, determining the touch direction as a first direction; and if the touch direction is smaller than the first direction, determining the touch direction as a second direction, wherein the first direction and the second direction are opposite to each other.
Preferably, the determining the change in capacitance value between the first equivalent capacitance and the second equivalent capacitance further includes: before the first equivalent capacitance and the second equivalent capacitance are charged, releasing the electric quantity of the first equivalent capacitance and the second equivalent capacitance.
Preferably, the touch screen further includes a touch detection circuit, the touch detection circuit including: the controller comprises a first pin, a second pin, a third pin, a fourth pin and a fifth pin, wherein one end of the first capacitor is connected with the first pin, the other end of the first capacitor is connected with one end of the first resistor, the other end of the first resistor is connected with the second pin, one end of the second resistor is connected with the fourth pin, the other end of the second resistor is connected with one end of the second capacitor, the other end of the second capacitor is connected with the fifth pin, the first resistor is connected with the first sensing electrode, the third pin is connected with the second sensing electrode, the second resistor is connected with the third sensing electrode,
the method comprises the following steps: applying low-level signals to the first pin, the second pin, the third pin, the fourth pin and the fifth pin to release the electric quantity of the first capacitor, the second capacitor, the first equivalent capacitor and the second equivalent capacitor; applying a high-impedance signal to the first pin and the fifth pin, applying a high-level signal to the second pin and the fourth pin, and applying a low-level signal to the third pin to control charging of the first equivalent capacitor and the second equivalent capacitor; and applying a low-level signal to the first pin and the fifth pin, applying a high-resistance signal to the second pin and the fourth pin, and applying a low-level signal to the third pin to control the first equivalent capacitor and the second equivalent capacitor to charge the first capacitor and the second capacitor respectively. And judging whether the second pin and the fourth pin are low-level signals, if so, continuing to charge the first equivalent capacitor and the second equivalent capacitor, and if not, respectively recording the first charging time of the first equivalent capacitor for charging the first capacitor and the second charging time of the second equivalent capacitor for charging the second capacitor, and determining the touch direction according to the first charging time and the second charging time.
In a second aspect, an embodiment of the present invention provides a touch capacitor, including a first sensing electrode, a second sensing electrode, and a third sensing electrode, where the second sensing electrode is disposed between the first sensing electrode and the third sensing electrode, and the first sensing electrode and the third sensing electrode are disposed in a differential complementary symmetrical manner with respect to the second sensing electrode, and when the touch capacitor slides on a touch screen, a first equivalent capacitance is formed between the first sensing electrode and the second sensing electrode, and a second equivalent capacitance is formed between the third sensing electrode and the second sensing electrode, and the first equivalent capacitance increases progressively according to a preset direction, and the second equivalent capacitance decreases progressively according to the preset direction.
In a third aspect, an embodiment of the present invention provides a touch screen, including: touch capacitance as described above; the first charging circuit is connected to the first induction electrode and used for charging the touch screen through the first equivalent capacitor; the second charging circuit is connected to the third induction electrode and is used for charging the touch screen through the second equivalent capacitor; and a controller connected to the first charging circuit and the second charging circuit, respectively; wherein the controller comprises: at least one processor; and a memory coupled to the at least one processor; wherein the memory stores a program of instructions executable by the at least one processor to enable the at least one processor to perform the touch detection method as described above.
Preferably, the first charging circuit includes: the device comprises a first capacitor and a first resistor, wherein one end of the first capacitor is connected with a first pin of the controller, the other end of the first capacitor is connected with one end of the first resistor and the first induction electrode, and the other end of the first resistor is connected with a second pin of the controller.
Preferably, the second charging circuit includes: the device comprises a controller, a first resistor, a second resistor and a third sensing electrode, wherein one end of the first resistor is connected with a first pin of the controller, the other end of the first resistor is connected with one end of the second capacitor and the third sensing electrode, the other end of the first capacitor is connected with a second pin of the controller, and the third pin of the controller is connected with the second sensing electrode.
In a fourth aspect, an embodiment of the present invention provides an electronic device, including a touch screen as described above.
Compared with the prior art, the embodiment of the invention has the beneficial effects that: by placing the first sensing electrode and the third sensing electrode in a complementary manner, when the touch screen slides, the change of capacitance values of the first equivalent capacitance and the second equivalent capacitance is determined; and determining the sliding direction of the finger on the touch screen, and improving the waterproof and electromagnetic interference preventing capabilities of the capacitive sliding strip.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
FIG. 1 is a schematic diagram of a touch capacitor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a charging circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a controller according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a touch detection method of a touch screen according to an embodiment of the present invention;
FIG. 6 is a schematic flow chart of step 10 in FIG. 5 according to an embodiment of the present invention;
FIG. 7 is a flow chart of step 20 of FIG. 5 according to an embodiment of the present invention;
fig. 8 is a flowchart of another touch detection method of a touch screen according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. 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.
In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The touch electrode is generally applied to a touch screen, in order to determine the sliding direction of a finger, a plurality of electrodes are needed in the existing touch screen, when the sliding direction of the finger is determined, only the capacitance variation of each sensing electrode is measured independently, and when each sensing line is interfered by the outside, the sensing sensitivity of the finger is different, so that the error rate of detecting the finger direction can be increased.
In order to reduce interference of external environment, the invention provides a touch capacitor, which is applied to various types of electronic devices, such as: the electronic equipment can be electronic products such as a mobile phone, a flat plate, an electric toothbrush and the like, wherein when the electronic equipment can slide through fingers, the sliding direction of the fingers is determined by detecting the capacitance variation of the two sensing electrodes at the same time, and the occurrence of the error rate of finger direction detection caused by different sensing sensitivity of the fingers when external interference is avoided.
Referring to fig. 1, fig. 1 shows a touch capacitor 100 according to an embodiment of the present invention, which includes a first sensing electrode 10, a second sensing electrode 20 and a third sensing electrode 30, wherein the first sensing electrode 10 and the third sensing electrode 30 are arranged in a differential complementary symmetrical manner, at least one first gap 101 is disposed between the first sensing electrode 10 and the second sensing electrode 20, at least one second gap 301 is disposed between the third sensing electrode 30 and the second sensing electrode 20, the depth of the first gap 101 increases sequentially in a preset direction, and the depth of the second gap 301 decreases sequentially in a preset direction. Wherein the first gap 101 and the second gap 301 are arranged differentially and complementarily symmetrically with respect to the second sensing electrode 20.
The second sensing electrode 20 is disposed between the first sensing electrode 10 and the third sensing electrode 30, wherein the second sensing electrode 20 is inserted between the first gap 101 and the second gap 301, and when sliding on the touch screen, a first equivalent capacitance is formed between the first sensing electrode 10 and the second sensing electrode 20, and a second equivalent capacitance is formed between the third sensing electrode 30 and the second sensing electrode 20.
It will be appreciated that the first sensing electrode 10 and the third sensing electrode 30 are substantially triangular in shape.
The beneficial effects of this embodiment are: by placing the first sensing electrode 10 and the third sensing electrode 30 in differential complementary symmetry, when sliding on the touch screen, the change of the capacitance values of the first equivalent capacitance and the second equivalent capacitance is determined; and determining the sliding direction of the finger on the touch screen, avoiding external electromagnetic interference and improving the waterproof and electromagnetic interference preventing capabilities of the capacitive sliding strip.
Referring to fig. 2, fig. 3 and fig. 4 together, fig. 2 is a schematic structural diagram of a charging circuit according to an embodiment of the invention, fig. 3 is a schematic structural diagram of a controller, and fig. 4 is a schematic structural diagram of an electronic device.
A touch screen applied to an electronic device 400, comprising a controller 300, a first charging circuit and a second charging circuit, wherein the first charging circuit is connected to the first sensing electrode and is used for charging the touch screen through the first equivalent capacitor; the second charging circuit is connected to the third induction electrode and used for charging the touch screen through the second equivalent capacitor, and the controller is respectively connected with the first charging circuit and the second charging circuit.
The controller 300 includes: the first pin, the second pin, the third pin, the fourth pin and the fifth pin.
The first charging circuit comprises a first capacitor, a capacitor and a first resistor, wherein one end of the first capacitor is connected with the first pin, the other end of the first capacitor is connected with one end of the first resistor and the first induction electrode, and the other end of the first resistor is connected with the second pin.
The first charging circuit comprises a second resistor and a second capacitor, one end of the second resistor is connected to the fourth pin, the other end of the second resistor is connected to one end of the second capacitor and a third induction electrode, the other end of the second capacitor is connected to the fifth pin, and the third pin is connected to the second induction electrode.
Therefore, when sliding on the touch screen, a first equivalent capacitance is formed between the first sensing electrode and the second sensing electrode, and a second equivalent capacitance is formed between the third sensing electrode and the second sensing electrode, so that the first equivalent capacitance charges the touch screen, namely the capacitor C1, through the first charging circuit, and the second equivalent capacitance charges the touch screen, namely the capacitor C2, through the second charging circuit.
The controller 300 further comprises at least one processor 301; and a memory 302 coupled to the at least one processor 301; wherein the memory 302 stores a program of instructions executable by the at least one processor 301, the program of instructions being executable by the at least one processor 301 to enable the at least one processor 301 to perform a touch detection method of a touch screen as described below.
The memory 302 is used as a non-volatile computer readable storage medium for storing a non-volatile software program, a non-volatile computer executable program, and modules, and corresponds to the touch detection method of the touch screen in the following embodiments. The processor 301 executes various functional applications and data processing of the touch screen, that is, functions implementing steps corresponding to a touch detection method of the touch screen as described below, by running nonvolatile software programs, instructions, and modules stored in the memory 302.
Memory 302 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 302 may optionally include memory located remotely from processor 301, which may be connected to the processor via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The program instructions/modules are stored in the memory 302, which when executed by the one or more processors 301, perform the touch detection method of the touch screen in any of the method embodiments described below, for example, performing the steps shown in fig. 5-8 described in the embodiments described below.
The embodiment of the invention has the beneficial effects that: through placing first sensing electrode and second sensing electrode difference complementation, when sliding on the touch-sensitive screen, through control first equivalent electric capacity with second equivalent electric capacity is respectively to first electric capacity and second electric capacity charge, through the change of determining charging time, confirm the gliding direction of finger at the touch-sensitive screen improves the waterproof and electromagnetic interference's of capacitive draw runner ability.
In this embodiment, the touch detection method of the touch screen is used for collecting capacitance of the touch screen, the touch screen includes a first sensing electrode, a second sensing electrode and a third sensing electrode, the first sensing electrode and the third sensing electrode are arranged in a differential complementary symmetrical manner, the second sensing electrode is arranged between the first sensing electrode and the third sensing electrode, and when the touch screen slides on, a first equivalent capacitance is formed between the first sensing electrode and the second sensing electrode, a second equivalent capacitance is formed between the third sensing electrode and the second sensing electrode, the first equivalent capacitance increases gradually according to a preset direction, and the second equivalent capacitance decreases gradually according to the preset direction. Referring to fig. 5, 6 and 7, the touch detection method of the touch screen includes:
and step 10, determining the change of the capacitance values of the first equivalent capacitance and the second equivalent capacitance when the touch screen slides.
The design mode of the first sensing electrode and the third sensing electrode can show that when a finger slides from left to right, the area of the first sensing electrode on the left side is smaller than that of the third sensing electrode, and the area of the first sensing electrode and the second sensing electrode covered by the finger is smaller than that of the second sensing electrode and the third sensing electrode, so that the capacitance value of the first equivalent capacitance increases and is larger than that of the second equivalent capacitance when the first equivalent capacitance slides from left to right, and therefore, the change of the capacitance values of the first equivalent capacitance and the second equivalent capacitance can be determined when the finger slides on the touch screen.
Step 101, before charging the first equivalent capacitor and the second equivalent capacitor, releasing the electric quantity of the first equivalent capacitor and the second equivalent capacitor.
Before the finger slides, in order to guarantee the accuracy of testing result, release earlier first equivalent electric capacity with the electric quantity of second equivalent electric capacity prevents first equivalent electric capacity with the remaining electric quantity of second equivalent electric capacity influences the electric quantity of the first equivalent electric capacity and the second equivalent electric capacity that form when the finger slides on the touch-sensitive screen, influences the determination to the finger slip direction.
Step 102, applying level signals to the first sensing electrode and the third sensing electrode to charge the first equivalent capacitor and the second equivalent capacitor, respectively.
And by applying a level signal to the first sensing electrode and the third sensing electrode, specifically applying a high level signal to the first sensing electrode and the third sensing electrode and applying a low level signal to the second sensing electrode, the first equivalent capacitance and the second equivalent capacitance are charged.
Step 103, recording a first charging time for the first equivalent capacitor to charge the touch screen to a preset voltage threshold value and a second charging time for the second equivalent capacitor to charge the touch screen to the preset voltage threshold value.
The preset voltage threshold is a critical point of the touch screen voltage, namely a maximum voltage value which can be received by the touch screen in the finger sliding process, the first charging time is the time for charging the first equivalent capacitor to the preset voltage threshold, and the second charging time is the time for charging the second equivalent capacitor to the preset voltage threshold, wherein the first charging time and the second charging time are different.
When the finger slides from left to right on the touch screen, the area of the first sensing electrode and the second sensing electrode contacted with the finger during the sliding is smaller than that of the second sensing electrode and the third sensing electrode contacted with the finger, so that the capacitance value of the second equivalent capacitor is larger than that of the first equivalent capacitor. When a finger slides on the touch screen from right to left, the area of the first sensing electrode and the second sensing electrode contacted with the finger during the sliding is larger than the area of the second sensing electrode and the third sensing electrode contacted with the finger, so that the capacitance value of the second equivalent capacitor is smaller than that of the first equivalent capacitor.
Step 104, determining the change of the capacitance values of the first equivalent capacitance and the second equivalent capacitance according to the first charging time and the second charging time.
According to the above, the first equivalent capacitor and the second equivalent capacitor are charged to the touch screen at the same time and have different time to the preset voltage threshold, that is, the first charging time is different from the second charging time, if the first charging time is longer than the second charging time, the second equivalent capacitor is charged faster and the time taken to charge to the preset voltage threshold is shorter, and the first equivalent capacitor is charged slower and the time taken to charge to the preset voltage threshold is longer, because the second equivalent capacitor is charged faster, the electric quantity of the electric field is larger, and the first equivalent capacitor is charged slower, the electric quantity of the electric field is smaller, and because the first equivalent capacitor is formed by the first sensing electrode and the second sensing electrode, the second equivalent capacitor is formed by the second sensing electrode and the third sensing electrode, and the first equivalent capacitor is smaller than the capacitance value of the second equivalent capacitor, the sliding direction of the finger can be determined to slide from left to right.
And step 20, determining a touch direction according to the change of the capacitance values of the first equivalent capacitance and the second equivalent capacitance.
When the finger slides on the touch screen, the sliding direction of the finger is determined according to the change of the capacitance values of the first equivalent capacitance and the second equivalent capacitance.
Further, determining the touch direction according to the change of the capacitance values of the first equivalent capacitance and the second equivalent capacitance, further includes:
step 201, determining whether the first charging time is greater than the second charging time.
From the above, according to the first charging time and the second charging time, the magnitudes of the first equivalent capacitance and the second equivalent capacitance can be deduced, and the sliding direction of the finger on the touch screen is determined according to the magnitudes of the first equivalent capacitance and the second equivalent capacitance.
And step 202, if the touch direction is greater than the first direction, determining the touch direction as the first direction.
The first direction is a direction in which a finger slides on the touch screen, specifically, the direction in which the finger slides on the touch screen is a direction from left to right, the first charging time is a time for the touch screen to charge to a preset voltage threshold, the second charging time is a time for the second equivalent capacitance to charge to the preset voltage threshold, the first equivalent capacitance is formed by a first sensing electrode and a second sensing electrode, the second equivalent capacitance is formed by a second sensing electrode and a third sensing electrode, if the first charging time is longer than the second charging time, the first equivalent capacitance is a time for the touch screen to charge to the preset voltage threshold, the charging speed is slower, the first equivalent capacitance electric quantity is smaller, the second equivalent capacitance is a time for the touch screen to charge to the preset voltage threshold, and the charging speed is faster, and the second equivalent capacitance electric quantity is larger.
And 203, if the touch direction is smaller than the first direction, determining the touch direction as a second direction, wherein the first direction and the second direction are opposite to each other.
The second direction is a direction in which the finger slides on the touch screen, specifically, the direction in which the finger slides on the touch screen is from right to left, if the first charging time is less than the second charging time, the time taken by the first equivalent capacitance to charge the touch screen to a preset voltage threshold is relatively short, the charging speed is relatively high, which means that the electric quantity of the first equivalent capacitance is relatively large, and the time taken by the second equivalent capacitance to charge the touch screen to the preset voltage threshold is relatively long, the charging speed is relatively slow, which means that the electric quantity of the second equivalent capacitance is relatively small, therefore, the capacitance value of the first equivalent capacitance is larger than that of the second equivalent capacitance, and the direction in which the finger slides can be determined to slide from right to left.
It is to be understood that, one end of the first capacitor is connected to the first pin, the other end of the first capacitor is connected to one end of the first resistor, the other end of the first resistor is connected to the second pin, one end of the second resistor is connected to the fourth pin, the other end of the second resistor is connected to one end of the second capacitor, the other end of the second capacitor is connected to the fifth pin, one end of the third pin is connected to the first resistor and the second resistor, respectively, wherein the first resistor is connected to the first electrode, the third pin is connected to the second electrode, and the second resistor is connected to the third electrode, please refer to fig. 8, and fig. 8 is a schematic flow chart of a touch detection method of a touch screen according to an embodiment of the present invention; the step of determining the direction of finger sliding specifically comprises the following steps:
step 301, applying low-level signals to the first pin, the second pin, the third pin, the fourth pin and the fifth pin, and releasing the electric quantity of the first capacitor, the second capacitor, the first equivalent capacitor and the second equivalent capacitor.
The level signal is one level in a circuit, and usually, the circuit has only a high level and a low level, the low level is 0V, and the high level is the same level value as the power supply voltage. And applying low-level signals to the first pin, the second pin, the third pin, the fourth pin and the fifth pin, wherein even if the voltages of the first pin, the second pin, the third pin, the fourth pin and the fifth pin are kept at 0V, if the electric quantity of the first capacitor, the second capacitor, the first equivalent capacitor and the second equivalent capacitor is not zero, the first capacitor, the second capacitor, the first equivalent capacitor and the second equivalent capacitor can discharge outwards so as to empty the electric quantity of the first capacitor, the second capacitor, the first equivalent capacitor and the second equivalent capacitor, and accurately determine the sliding direction of the finger.
Step 302, applying high-impedance signals to the first pin and the fifth pin, applying high-level signals to the second pin and the fourth pin, and applying low-level signals to the third pin to control charging of the first equivalent capacitor and the second equivalent capacitor.
The high-resistance signal refers to an output state of the circuit, which is neither a high level nor a low level, and when the circuit is analyzed, the high-resistance signal can be understood as an open circuit, and can be understood as a very large output (input) resistance, and the limit can be considered as suspension.
And the high-resistance signals are applied to the first pin and the fifth pin, the high-level signals are applied to the second pin and the fourth pin, and the low-level signals are applied to the third pin, which is equivalent to suspending the first capacitor and the second capacitor, so that the first equivalent capacitor and the second equivalent capacitor are not influenced to be charged.
It can be understood that before the first equivalent capacitor and the second equivalent capacitor are charged, the first pin, the second pin, the fourth pin and the fifth pin are controlled to be applied with high-impedance signals, the first capacitor and the second capacitor are suspended, and meanwhile, the level of only one of the first pin, the second pin, the third pin, the fourth pin and the fifth pin is ensured to be changed.
Step 303, applying a low-level signal to the first pin and the fifth pin, applying a high-impedance signal to the second pin and the fourth pin, and applying a low-level signal to the third pin to control the first equivalent capacitor and the second equivalent capacitor to charge the first capacitor and the second capacitor, respectively.
By applying high-impedance signals to the second pin and the fourth pin, the first equivalent capacitor and the second equivalent capacitor are prevented from being charged, and low-level signals are applied to the first pin and the fifth pin, so that the first equivalent capacitor and the second equivalent capacitor charge the first capacitor and the second capacitor.
Step 304, determining whether the second pin and the fourth pin are low level signals.
And whether the first equivalent capacitor and the second equivalent capacitor are in a charging state or not can be determined by judging the level of the second pin and the level of the fourth pin, if the second pin and the fourth pin are low-level signals, the first equivalent capacitor and the second equivalent capacitor are continuously charged, and at the moment, the first equivalent capacitor and the second equivalent capacitor are in a charging state, and if the second pin and the fourth pin are high-level signals, the first equivalent capacitor and the second equivalent capacitor are not charged any more, and the first equivalent capacitor and the second equivalent capacitor are in a discharging state.
And step 305, if yes, continuing to charge the first equivalent capacitor and the second equivalent capacitor.
If the second pin and the fourth pin are low-level signals, the first equivalent capacitor and the second equivalent capacitor are not charged yet, and the first equivalent capacitor and the second equivalent capacitor are continuously charged.
Step 306, if not, recording a first charging time when the first equivalent capacitor charges the first capacitor and a second charging time when the second equivalent capacitor charges the second capacitor, and determining a touch direction according to the first charging time and the second charging time.
If the second pin and the fourth pin are not low-level signals, the first equivalent capacitance and the second equivalent capacitance charge the first capacitance and the second capacitance to reach a preset capacitance threshold, a first charge time of the first equivalent capacitance for charging the first capacitance and a second charge time of the second equivalent capacitance for charging the second capacitance are recorded respectively, a touch direction is judged according to the first charge time and the second charge time, when the first charge time is longer than the second charge time, the time for charging the first equivalent capacitance to the preset voltage threshold of the touch screen is longer, the charge speed is slower, the electric quantity of the first equivalent capacitance is smaller, the electric quantity of the second equivalent capacitance is shorter, and the electric quantity of the second equivalent capacitance is larger.
The embodiment of the invention has the beneficial effects that: through placing the first sensing electrode and the third sensing electrode in a differential complementary symmetry way, when the touch screen slides, the sliding direction of the finger on the touch screen is determined by acquiring the change of the capacitance values of the first equivalent capacitance and the second equivalent capacitance, the problem of external electromagnetic interference caused by judging the touch direction only by determining the capacitance of one sensing electrode in the prior art is solved, and the waterproof and electromagnetic interference preventing capabilities of the capacitive sliding strip are improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The touch detection method of the touch screen is characterized in that the touch screen comprises a first sensing electrode, a second sensing electrode and a third sensing electrode, wherein the second sensing electrode is arranged between the first sensing electrode and the third sensing electrode, the first sensing electrode and the third sensing electrode are arranged in a differential complementary symmetrical mode relative to the second sensing electrode, when the touch screen slides on the touch screen, a first equivalent capacitance is formed between the first sensing electrode and the second sensing electrode, a second equivalent capacitance is formed between the third sensing electrode and the second sensing electrode, the first equivalent capacitance increases gradually according to a preset direction, and the second equivalent capacitance decreases gradually according to the preset direction;
the method comprises the following steps:
determining a change in capacitance value of the first equivalent capacitance and the second equivalent capacitance when the touch screen slides;
and determining the touch direction according to the change of the capacitance values of the first equivalent capacitance and the second equivalent capacitance.
2. The method of claim 1, wherein the determining a change in capacitance value of the first equivalent capacitance and the second equivalent capacitance comprises:
applying level signals to the first sensing electrode and the third sensing electrode to charge the first equivalent capacitor and the second equivalent capacitor respectively;
recording a first charging time for the first equivalent capacitor to charge the touch screen to a preset voltage threshold value and a second charging time for the second equivalent capacitor to charge the touch screen to the preset voltage threshold value;
and determining the change of the capacitance values of the first equivalent capacitance and the second equivalent capacitance according to the first charging time and the second charging time.
3. The method of claim 2, wherein the determining the touch direction from the change in capacitance value of the capacitance values of the first equivalent capacitance and the second equivalent capacitance comprises:
judging whether the first charging time is longer than the second charging time;
if the touch direction is larger than the first direction, determining the touch direction as a first direction;
and if the touch direction is smaller than the first direction, determining the touch direction as a second direction, wherein the first direction and the second direction are opposite to each other.
4. The method of claim 2, wherein the determining a change in capacitance value between the first equivalent capacitance and the second equivalent capacitance further comprises:
before the first equivalent capacitance and the second equivalent capacitance are charged, releasing the electric quantity of the first equivalent capacitance and the second equivalent capacitance.
5. The method of claim 2, wherein the touch screen further comprises a touch detection circuit, the touch detection circuit comprising: the controller comprises a first pin, a second pin, a third pin, a fourth pin and a fifth pin, one end of the first capacitor is connected with the first pin, the other end of the first capacitor is connected with one end of the first resistor, the other end of the first resistor is connected with the second pin, one end of the second resistor is connected with the fourth pin, the other end of the second resistor is connected with one end of the second capacitor, the other end of the second capacitor is connected with the fifth pin, wherein the first resistor is connected with the first sensing electrode, the third pin is connected with the second sensing electrode, the second resistor is connected with the third sensing electrode, and the method comprises the following steps:
applying low-level signals to the first pin, the second pin, the third pin, the fourth pin and the fifth pin, and releasing the electric quantity of the first capacitor, the second capacitor, the first equivalent capacitor and the second equivalent capacitor;
applying a high-impedance signal to the first pin and the fifth pin, applying a high-level signal to the second pin and the fourth pin, and applying a low-level signal to the third pin to control charging of the first equivalent capacitor and the second equivalent capacitor;
applying a low-level signal to the first pin and the fifth pin, applying a high-resistance signal to the second pin and the fourth pin, and applying a low-level signal to the third pin to control the first equivalent capacitor and the second equivalent capacitor to charge the first capacitor and the second capacitor respectively;
determining whether the second pin and the fourth pin are low level signals,
if yes, continuing to charge the first equivalent capacitance and the second equivalent capacitance,
if not, respectively recording a first charging time when the first equivalent capacitor charges the first capacitor and a second charging time when the second equivalent capacitor charges the second capacitor, and determining a touch direction according to the first charging time and the second charging time.
6. The utility model provides a touch capacitance, its characterized in that includes first sensing electrode, second sensing electrode and third sensing electrode, the second sensing electrode set up in between first sensing electrode and the third sensing electrode, just first sensing electrode with the third sensing electrode is for the complementary symmetry setting of second sensing electrode difference, and when sliding on the touch-sensitive screen, be formed with first equivalent capacitance between first sensing electrode and the second sensing electrode, third sensing electrode with be formed with second equivalent capacitance between the second sensing electrode, first equivalent capacitance increases gradually according to predetermineeing the direction, second equivalent capacitance decreases according to predetermineeing the direction, wherein, be equipped with at least one first clearance between first sensing electrode and the second sensing electrode, be equipped with at least one second clearance between the third sensing electrode and the second sensing electrode, first clearance with the complementary symmetry setting of second clearance difference for the second sensing electrode.
7. A touch screen, comprising:
the touch capacitance of claim 6;
the first charging circuit is connected to the first induction electrode and used for charging the touch screen through the first equivalent capacitor;
the second charging circuit is connected to the third induction electrode and is used for charging the touch screen through the second equivalent capacitor; the method comprises the steps of,
the controller is respectively connected with the first charging circuit and the second charging circuit;
wherein the controller comprises:
at least one processor; the method comprises the steps of,
a memory coupled to the at least one processor; wherein,
the memory stores a program of instructions executable by the at least one processor to enable the at least one processor to perform the touch detection method of any one of claims 2-5.
8. The touch screen of claim 7, wherein the first charging circuit comprises: the device comprises a first capacitor and a first resistor, wherein one end of the first capacitor is connected with a first pin of the controller, the other end of the first capacitor is connected with one end of the first resistor and the first induction electrode, and the other end of the first resistor is connected with a second pin of the controller.
9. The touch screen of claim 7, wherein the second charging circuit comprises: the device comprises a controller, a first resistor, a second resistor and a third capacitor, wherein one end of the first resistor is connected with a first pin of the controller, the other end of the first resistor is connected with one end of the second capacitor and a third induction electrode, the other end of the first capacitor is connected with a fifth pin of the controller, and the third pin of the controller is connected with the first induction electrode.
10. An electronic device comprising a touch screen as claimed in any one of claims 7 to 9.
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| CN112040592B (en) * | 2020-10-14 | 2023-12-12 | 广东新晨汽车科技股份有限公司 | Touch-sensitive LED lamp control circuit |
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