CN116661614A - Touch equipment, touch position detection method, device and storage medium - Google Patents
Touch equipment, touch position detection method, device and storage medium Download PDFInfo
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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
- G06F3/0416—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
- G06F3/04186—Touch location disambiguation
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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
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
Abstract
The embodiment of the application belongs to the touch technology, and provides a touch device, a touch position detection method, a touch position detection device and a storage medium. The touch device includes: the display screen and the touch control assembly are connected with the display screen and the processor of the touch control induction driving module. The processor is configured to: controlling the touch sensing driving module to scan the driving channels so that each driving channel drives each sensing channel to output sensing signals; collecting the actual amplitude of the induction signal corresponding to each node; according to the actual amplitude of the induction signal corresponding to each node and the difference of the target reference voltage corresponding to each node, acquiring a touch detection result; the target reference voltage is used for representing a difference between a first amplitude of the sensing signal corresponding to the node and a desired amplitude of the sensing signal corresponding to the node; the expected amplitude values corresponding to the nodes are equal; the first amplitude is obtained by detecting the output induction signals of all the nodes before the actual amplitude is acquired. The application improves the accuracy of touch position detection.
Description
Technical Field
The embodiment of the application relates to a touch technology. And more particularly, to a touch device, a touch position detection method, a touch position detection device, and a storage medium.
Background
The touch device (such as a smart television with a touch interaction function, a smart interaction tablet and the like) can detect the touch position of a user on the device and display a corresponding interface according to the touch position of the user. The touch device can realize the function of detecting the touch position of the user on the device based on the touch component. In particular, the touch device may perform touch position detection based on the intensities of the sensing signals output by the sensing channels at different positions in the touch assembly.
However, in the production process of the touch device, due to the limitation of the production process, the intensities of the sensing signals output by the sensing channels at different positions of the touch device often have differences, so that the problem of poor accuracy of touch position detection is caused.
Disclosure of Invention
The exemplary embodiment of the application provides a touch device, a touch position detection method, a touch position detection device and a storage medium, which can improve the accuracy of touch position detection.
In a first aspect, the present application provides a touch device, including:
The display screen is used for displaying images;
a touch assembly, comprising: the touch sensing driving module, the driving electrode layer and the sensing electrode layer are positioned on the upper side of the display screen; the driving electrode layer comprises N driving channels; the induction electrode layer comprises M induction channels; k nodes exist between the N driving channels and the M sensing channels; n and M are integers greater than or equal to 2; the K is equal to the product of M and N;
a processor coupled to the display screen and the touch sensitive drive module, the processor configured to:
controlling the touch sensing driving module to scan the N driving channels so that each driving channel drives each sensing channel to output sensing signals;
collecting the actual amplitude of the induction signal corresponding to each node;
according to the actual amplitude of the induction signal corresponding to each node and the difference of the target reference voltage corresponding to each node, a touch detection result is obtained; for each node, the target reference voltage is used for representing a difference between a first amplitude of the sensing signal corresponding to the node and a desired amplitude of the sensing signal corresponding to the node; the expected amplitude values corresponding to the nodes are equal; the touch detection result is used for indicating that no touch exists or that a touch exists at a target position; the first amplitude is obtained by detecting the output induction signals of all the nodes before the actual amplitude is acquired;
And when the touch detection result is used for representing that the target position has touch, responding to touch operation aiming at the target position.
In some embodiments, the processor is configured to:
collecting first amplitude values of induction signals corresponding to the nodes;
and for each node, acquiring a target reference voltage corresponding to the node according to the difference between the first amplitude of the sensing signal corresponding to the node and the expected amplitude of the sensing signal corresponding to the node.
In some embodiments, the first amplitude of the sensing signal corresponding to each node is an amplitude amplified by a preset multiple by the amplifying module, and the processor is configured to:
for each node, acquiring an initial reference voltage corresponding to the node according to the difference between the first amplitude of the sensing signal corresponding to the node and the expected amplitude of the sensing signal corresponding to the node;
and obtaining a target reference voltage corresponding to the node according to the quotient of the initial reference voltage and the preset amplification factor.
In some embodiments, the processor is configured to:
after the touch equipment is electrified for the first time, collecting a first amplitude value of an induction signal corresponding to each node so as to obtain a target reference voltage corresponding to each node; or alternatively, the process may be performed,
After the touch equipment is electrified each time, collecting a first amplitude value of an induction signal corresponding to each node so as to obtain a target reference voltage corresponding to each node; or alternatively, the process may be performed,
and acquiring a first amplitude of the induction signal corresponding to each node according to a preset updating period so as to acquire a target reference voltage corresponding to each node.
In some embodiments, the touch device further includes a differential circuit, the nodes are connected to a first end of the differential circuit, the processor is connected to a second end of the differential circuit, the differential circuit is configured to perform a difference on an actual amplitude of the sensing signal corresponding to each node, and a target reference voltage, and output a target difference value, and the processor is configured to:
inputting a target reference voltage corresponding to each node into the differential circuit;
receiving the target difference value output by the differential circuit;
and acquiring the touch detection result according to the target difference value corresponding to each node.
In some embodiments, the differential circuit is further configured to amplify a difference between an actual amplitude of the sensing signal corresponding to the node and a target reference voltage to obtain the target difference value.
In a second aspect, the present application provides a touch location detection method, where the method is applied to a touch device, and the touch device includes: the touch control assembly, the touch control assembly includes: the touch sensing driving module, the driving electrode layer and the sensing electrode layer are positioned on the upper side of the display screen; the driving electrode layer comprises N driving channels; the induction electrode layer comprises M induction channels; k nodes exist between the N driving channels and the M sensing channels; n and M are integers greater than or equal to 2; the K is equal to the product of M and N; the method comprises the following steps:
controlling the touch sensing driving module to scan the N driving channels so that each driving channel drives each sensing channel to output sensing signals;
collecting the actual amplitude of the induction signal corresponding to each node;
according to the actual amplitude of the induction signal corresponding to each node and the difference of the target reference voltage corresponding to each node, a touch detection result is obtained; for each node, the target reference voltage is used for representing a difference between a first amplitude of the sensing signal corresponding to the node and a desired amplitude of the sensing signal corresponding to the node; the expected amplitude values corresponding to the nodes are equal; the touch detection result is used for indicating that no touch exists or that a touch exists at a target position; the first amplitude is obtained by detecting the output induction signals of all the nodes before the actual amplitude is acquired;
And when the touch detection result is used for representing that the target position has touch, responding to touch operation aiming at the target position.
In a third aspect, the present application provides a touch position detection apparatus, the apparatus being applied to a touch device, the touch device including: the touch control assembly, the touch control assembly includes: the touch sensing driving module, the driving electrode layer and the sensing electrode layer are positioned on the upper side of the display screen; the driving electrode layer comprises N driving channels; the induction electrode layer comprises M induction channels; k nodes exist between the N driving channels and the M sensing channels; n and M are integers greater than or equal to 2; the K is equal to the product of M and N; the device comprises:
the scanning module is used for controlling the touch sensing driving module to scan the N driving channels so that each driving channel drives each sensing channel to output sensing signals;
the acquisition module is used for acquiring the actual amplitude of the induction signal corresponding to each node;
the processing module is used for acquiring a touch detection result according to the actual amplitude of the induction signal corresponding to each node and the difference of the target reference voltage corresponding to each node; for each node, the target reference voltage is used for representing a difference between a first amplitude of the sensing signal corresponding to the node and a desired amplitude of the sensing signal corresponding to the node; the expected amplitude values corresponding to the nodes are equal; the touch detection result is used for indicating that no touch exists or that a touch exists at a target position; the first amplitude is obtained by detecting the output induction signals of all the nodes before the actual amplitude is acquired;
And the response module is used for responding to the touch operation aiming at the target position when the touch detection result is used for representing that the target position has touch.
In a fourth aspect, the present application provides a computer-readable storage medium having stored thereon computer-executable instructions which, when executed by a processor, implement the method of the second aspect.
In a fifth aspect, the application provides a computer program product comprising a computer program which, when executed by a processor, implements the method of the second aspect.
According to the touch equipment, the touch position detection method, the touch position detection device and the storage medium, after the actual amplitude of the sensing signal corresponding to each node is obtained, the touch detection result is obtained according to the actual amplitude of the sensing signal corresponding to each node and the difference of the target reference voltage corresponding to each node. Since the target reference voltage corresponding to each node is the difference between the first amplitude of the sensing signal and the desired amplitude, the desired amplitude is obtained by subtracting the target reference voltage from the actual amplitude of the sensing signal. Because the expected amplitude values corresponding to the nodes are the same, the actual amplitude values of the induction signals corresponding to the nodes and the difference of the target reference voltages corresponding to the nodes are the same are ensured. The touch detection result is obtained by the method, the difference of the output induction signals among different nodes is reduced, and the accuracy of touch position detection is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the implementation of the related art, the drawings that are required for the embodiments or the related art description will be briefly described, and it is apparent that the drawings in the following description are some embodiments of the present application and that other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a touch device;
FIG. 2 is a schematic diagram of a driving electrode layer and a sensing electrode layer;
FIG. 3 is a schematic diagram of an induction signal;
fig. 4 is a schematic flow chart of a touch position detection method provided by the application;
fig. 5 is a schematic structural diagram of a differential circuit according to the present application;
fig. 6 is a flow chart of another touch position detection method provided by the application;
FIG. 7 is a schematic diagram showing a comparison of the sensing signal before and after processing;
FIG. 8 is a schematic diagram showing a comparison of the sensing signal before and after processing;
fig. 9 is a schematic structural diagram of a touch position detecting device provided by the present application.
Detailed Description
For the purposes of making the objects, embodiments and advantages of the present application more apparent, an exemplary embodiment of the present application will be described more fully hereinafter with reference to the accompanying drawings in which exemplary embodiments of the application are shown, it being understood that the exemplary embodiments described are merely some, but not all, of the examples of the application.
It should be noted that the brief description of the terminology in the present application is for the purpose of facilitating understanding of the embodiments described below only and is not intended to limit the embodiments of the present application. Unless otherwise indicated, these terms should be construed in their ordinary and customary meaning.
Furthermore, the terms "comprise" and "have," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements is not necessarily limited to those elements expressly listed, but may include other elements not expressly listed or inherent to such product or apparatus.
Fig. 1 is a schematic structural diagram of a touch device. As shown in fig. 1, the touch device may include a processor, a touch assembly, and a display screen. The touch control component can comprise a touch control induction driving module, a driving electrode layer and an induction electrode layer. Wherein, drive electrode layer and induction electrode layer are located the upside of display screen. The present application is not limited to the upper and lower layer relationship between the driving electrode layer and the sensing electrode layer. When a user touches the touch control component, the processor can acquire the relevant information of the touch control position touched by the user through the touch control component, and determine the position touched by the user according to the relevant information of the touch control position. And the processor can respond to the operation corresponding to the touch position. Through the above process, touch interaction can be realized.
The touch device may be, for example, a touch device such as a mobile phone, a tablet computer, a desktop computer, a notebook computer, a camera, a smart watch, a smart television, or a smart interactive tablet. It should be understood that the present application is not limited in the manner in which the user touches the touch device. For example, a user may interact with the touch device by a finger, or a stylus, or the like.
In some embodiments, a display screen is used to display the image. The display screen may include a display panel, for example. The display panel may employ a liquid crystal display (liquid crystal display, LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (AMOLED) or an active-matrix organic light-emitting diode (matrix organic light emitting diode), a flexible light-emitting diode (flex), a mini, a Micro led, a Micro-OLED, a quantum dot light-emitting diode (quantum dot light emitting diodes, QLED), or the like. In some embodiments, the touch device may include 1 or more display screens.
In some embodiments, the processor may be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), programmable logic array (Programmable Logic Array, PLA). The processing component may integrate one or a combination of several of a central processing unit (Central Processing Unit, CPU), an image processor (Graphics Processing Unit, GPU), a micro control unit (Microcontroller Unit, MCU), and a modem etc. The CPU may process, among other things, an operating system, user interfaces, application programs, and the like. The GPU may be used to take care of rendering and drawing of content that the display screen is required to display. The modem may be used to handle wireless communications. It will be appreciated that the modem may not be integrated into the processing component and may be implemented solely by a single chip.
FIG. 2 is a schematic diagram of a driving electrode layer and a sensing electrode layer. As shown in fig. 2, the driving electrode layer may include N driving channels, and the sensing electrode layer may include M sensing channels. K nodes exist between the N driving channels and the M sensing channels. Wherein, N and M are integers greater than or equal to 2, and K is equal to the product of M and N. Alternatively, the number of driving channels may be the same as or different from the number of sensing channels, which is not limited in the present application.
In some embodiments, the drive channel and the sense channel may be made of transparent conductive material. The transparent conductor material may be, for example, indium Tin Oxide (ITO), or a nano silver material, or the like.
It should be understood that fig. 1 is merely an exemplary structure of a touch device, and the application is not limited to the touch device including other structures. In addition, it should be understood that fig. 2 is only an exemplary illustration of components related to the present application in the touch component, and the present application is not limited to whether the touch component further includes other components.
In the related touch position detection method, the processor may scan the N driving channels one by one through the touch sensing driving module. For the scanned driving channel, the processor can input a driving voltage signal to the driving channel through the touch sensing driving module. For capacitive touch devices, a coupling capacitance may be provided between the drive channel and the sense channel. After the driving channel receives the voltage input by the touch sensing driving module, the driving channel can charge each sensing channel through the coupling capacitor, and then the sensing channel can output sensing signals through each node. The processor of the touch device may perform touch position detection based on the magnitudes of the sensing signals output by the nodes at different positions.
Exemplary, fig. 3 is a schematic diagram of an induction signal. As shown in fig. 3, when a user touches the touch device, the amplitude (or signal strength) of the sensing signal output by the node at the touch position may be smaller than the amplitude of the sensing signal output by the node at the touch position when no touch is performed. That is, the processor may determine the touch location by sensing a change in the amplitude of the signal.
It should be understood that fig. 3 is merely an exemplary illustration taking the magnitude of the sensing signal output by the node at the touch location as being smaller than the magnitude of the sensing signal output by the node at the touch location in the absence of a touch. The application is not limited by the change of the amplitude of the sensing signal output by the node of the touch position relative to the amplitude of the sensing signal output by the node of the touch position when no touch exists. For example, in some embodiments, the magnitude of the sense signal output by a node at a touch location may be greater than the magnitude of the sense signal output by the node at the touch location in the absence of a touch.
As mentioned above, the drive channel and the sense channel are both conductive materials. Typically, the conductor material used for the drive and sense channels is a conductor material having a certain resistance value. The resistance values of the driving channel and the sensing channel influence the amplitude of the sensing signal output by the node. In the production process of the touch equipment, due to the limitation of the production process, the intensities of the induction signals output by the nodes at different positions of the touch equipment are different, so that the problem of poor accuracy of the conventional touch position detection method is caused.
In consideration of the problem of poor accuracy of the existing touch position detection method, the difference exists in the strength of the sensing signals output by the nodes at different positions of the touch equipment, so that the application provides a method for reducing the difference of the sensing signals output by the different nodes so as to improve the accuracy of touch position detection.
The execution body of the method can be a touch device or a processor of the touch device. The following describes the technical solution of the present application in detail with reference to specific embodiments by taking the execution body of the above method as an example of a touch device. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Fig. 4 is a flow chart of a touch position detection method provided by the application. As shown in fig. 4, the method may include the steps of:
s101, controlling the touch sensing driving module to scan N driving channels so that each driving channel drives each sensing channel to output sensing signals.
As described above, the touch device may input driving signals to the N driving channels one by one through the touch sensing driving module, so as to scan the N driving channels one by one. For example, the driving channel receiving the driving signal may input an excitation signal to each sensing channel through a coupling capacitance between the driving channel and each sensing channel, so as to enable the driving channel to drive each sensing channel. The sense channel may output a sense signal through each node after receiving the excitation signal.
It should be understood that the above implementation manner is only a possible implementation manner provided by the present application, and the present application does not limit how the touch device controls the touch sensing driving module to scan N driving channels, so that each driving channel drives each sensing channel to output a sensing signal.
S102, acquiring actual amplitude values of induction signals corresponding to all nodes.
Optionally, the touch device may receive, through the touch sensing driving module, an actual amplitude of the sensing signal corresponding to each node. In some embodiments, the touch sensing driving module may include a receiving array, and in this implementation, the touch device may collect, for example, an actual amplitude of the sensing signal corresponding to each node through the receiving array. For example, the receiving array may refer to any one of the existing sample-and-hold circuits, which is not described herein.
S103, according to the actual amplitude of the sensing signal corresponding to each node and the difference between the target reference voltage corresponding to each node, a touch detection result is obtained.
For each node, the target reference voltage is used for representing a difference between a first amplitude of the sensing signal corresponding to the node and a desired amplitude of the sensing signal corresponding to the node. The expected amplitude of the induction signals corresponding to the nodes is the same. The first amplitude is obtained by detecting the output induction signals of all nodes before the actual amplitude is acquired.
The touch detection result is used for indicating that no touch exists or that a touch exists at a target position.
Optionally, the target reference voltage corresponding to each node may be calibrated by the user through an offline experiment and stored in the touch device in advance.
Or, after the touch device is powered on, the first amplitude of the induction signal corresponding to each node is collected. Then, the touch device may obtain a target reference voltage corresponding to each node according to the difference between the first amplitude and a pre-stored expected amplitude. Then, the touch device may perform the above steps S102 to S103 based on the obtained target reference voltages corresponding to the nodes. In this implementation, the desired amplitude may be stored in the touch device in advance for the user, for example.
Alternatively, for each node, the touch device may, for example, use the difference between the actual amplitude of the sensing signal corresponding to the node and the target reference voltage as the strength of the sensing signal corresponding to the node. Then, the touch device can obtain a touch detection result according to the intensity of the induction signal corresponding to each node. It should be understood that the application is not limited to how the touch device obtains the touch detection result according to the intensity of the sensing signal corresponding to each node.
Optionally, a preset amplitude may be stored in the touch device in advance, and the touch device may determine that the touch detection result is used to indicate that no touch exists when the difference between the actual amplitude corresponding to each node and the target reference voltage is equal to the preset amplitude. Then, optionally, the touch device may continue to perform steps S101-S103 to perform touch position detection. If the touch device determines that the preset amplitude is different from the difference between the actual amplitude corresponding to the node of the target position and the target reference voltage, it may be determined that the touch detection result is used to represent that the target position has touch. Then, the touch device may perform step S104 in response to the touch operation for the target location.
Alternatively, the difference between the actual amplitude corresponding to the node at the target position and the target reference voltage, which is referred to herein as the preset amplitude, may be larger than the difference between the actual amplitude corresponding to the node at the target position and the target reference voltage, or smaller than the difference between the actual amplitude corresponding to the node at the target position and the target reference voltage.
And S104, when the touch detection result is used for representing that the target position has touch, responding to touch operation aiming at the target position.
It should be understood that the specific implementation manner of the touch device in response to the touch operation for the target position is not limited by the present application. Optionally, the target positions on the touch device are different, and the implementation manner of the touch device in response to the touch operation may be different or the same. For example, the response to the touch operation for the target position may, for example, control the display screen for the touch device to perform corresponding interface display, or change the volume of the touch device to a corresponding volume, or perform operations such as shutdown and restart.
In this embodiment, after the actual amplitude of the sensing signal corresponding to each node is obtained, the touch detection result is obtained according to the actual amplitude of the sensing signal corresponding to each node and the difference of the target reference voltages corresponding to each node. Since the target reference voltage corresponding to each node is the difference between the first amplitude of the sensing signal and the desired amplitude, the desired amplitude is obtained by subtracting the target reference voltage from the actual amplitude of the sensing signal. Because the expected amplitude values corresponding to the nodes are the same, the actual amplitude values of the induction signals corresponding to the nodes and the difference of the target reference voltages corresponding to the nodes are the same are ensured. The touch detection result is obtained by the method, the difference of the output induction signals among different nodes is reduced, and the accuracy of touch position detection is improved.
Taking the touch device as an example, before acquiring the touch detection result according to the actual amplitude of the sensing signal corresponding to each node and the target reference voltage corresponding to each node, how the touch device acquires the target reference voltage corresponding to each node is described in detail below:
as a possible implementation manner, the touch device may collect first amplitudes of the sensing signals corresponding to the nodes, and then, for each node, the touch device may obtain, according to a difference between the first amplitude of the sensing signal corresponding to the node and an expected amplitude of the sensing signal corresponding to the node, a target reference voltage corresponding to the node.
Optionally, the touch device further includes: the amplifying module is used for amplifying the sensing signals and inputting the sensing signals to the processor, and the first amplitude of the sensing signals corresponding to each node may be, for example, an amplitude amplified by a preset multiple by the amplifying module. In this implementation manner, for each node, the touch device may obtain, according to a difference between a first amplitude of the sensing signal corresponding to the node and a desired amplitude of the sensing signal corresponding to the node, an initial reference voltage corresponding to the node. For example, the touch device may use a difference between a first amplitude of the sensing signal corresponding to the node and a desired amplitude of the sensing signal corresponding to the node as an initial reference voltage corresponding to the node. Then, the touch device may obtain the target reference voltage corresponding to the node according to the quotient of the initial reference voltage and the preset amplification factor. For example, the touch device may divide the initial reference voltage by a preset magnification factor to obtain a quotient, which is used as the target reference voltage corresponding to the node.
Alternatively, in some embodiments, the first amplitude may be, for example, a first amplitude corresponding to an actual sensing signal output by each node. In this implementation manner, the touch device may divide the desired amplitude by the preset magnification factor to obtain the reduced desired amplitude. Then, the touch device may subtract the reduced expected amplitude from the first amplitude corresponding to the actual sensing signal output by each node, to obtain the target reference voltage corresponding to each node.
Still alternatively, after the touch device obtains the first amplitude of the sensing signal corresponding to each node, for each sensing channel, the touch device may obtain an average value of the first amplitudes of the sensing signals corresponding to the plurality of nodes on the sensing channel. Then, the touch device may use the difference between the average value and the desired amplitude as a target reference voltage corresponding to a plurality of nodes on the sensing channel.
In some embodiments, after the touch device is powered on for the first time, the touch device may collect a first amplitude of the sensing signal corresponding to each node, and then obtain the target reference voltage corresponding to each node through the above method. In this implementation manner, after the touch device acquires the target reference voltages corresponding to the nodes after the touch device is powered on for the first time, the acquired target reference voltages corresponding to the nodes may be stored in the touch device. After each power-up of the touch device after the initial power-up, touch position detection can be performed based on the target reference voltage. By the implementation mode, the calculated amount of the touch equipment is reduced, and the efficiency of the touch equipment in position detection is improved.
In some embodiments, the touch device may further collect a first amplitude of the sensing signal corresponding to each node after each power-up of the touch device, and then obtain the target reference voltage corresponding to each node through the above method. In the implementation manner, the touch device may update the target reference voltages corresponding to the nodes stored therein after each power-up, obtain updated target reference voltages, and perform touch position detection based on the updated target reference voltages. By the method, the touch device can perform touch position detection based on the updated target reference voltage after being electrified every time, and the accuracy of touch position detection is further improved.
In some embodiments, the touch device may further update the target reference voltage corresponding to each node once, for example, every preset number of times of power-up. The preset times may be, for example, the preset times in the touch device by the user.
In some embodiments, the touch device may further collect, according to a preset update period, a first amplitude of the sensing signal corresponding to each node, so as to obtain a target reference voltage corresponding to each node. The preset update period may be, for example, stored in the touch device in advance for the user. The preset period may be, for example, one month, or one week, or the like. In this implementation manner, if the touch device is in a non-powered-on state when the preset period is reached, the touch device may, for example, collect a first amplitude of an induction signal corresponding to each node after the touch device is powered on for the first time after the preset period is reached, so as to obtain a target reference voltage corresponding to each node.
In this embodiment, the target reference voltage obtained by subtracting the desired amplitude from the first amplitude of the sensing signal corresponding to each node in the touch position, so that the target reference voltage characterizes the difference between the amplitude of the sensing signal of each node and the desired amplitude, and further the touch device can reduce the difference of the sensing signals output between different nodes based on the target reference voltage, thereby improving the accuracy of touch position detection.
The following details how the touch device obtains the touch detection result according to the actual amplitude of the sensing signal corresponding to each node and the target reference voltage corresponding to each node:
as a possible implementation manner, the touch device may further include: a differential circuit. In this implementation, the nodes may be connected to a first terminal of the differential circuit. The processor may be coupled to the second terminal of the differential circuit. In this implementation, for each node, the touch device may input the target reference voltage corresponding to the node into the differential circuit. The differential circuit is used for making a difference between the actual amplitude of the sensing signal corresponding to each node and the target reference voltage and outputting a target difference value. Then, the touch device may receive the target difference value output by the differential circuit, and obtain a touch detection result according to the target difference value corresponding to each node.
Fig. 5 is a schematic diagram of a differential circuit according to the present application. As shown in fig. 5, the differential circuit may include: the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the operational amplifier. Wherein, the liquid crystal display device comprises a liquid crystal display device,
a first end of a third resistor R3 is connected to each node, and a second end of the third resistor R2 is connected to a non-inverting input of the operational amplifier. The first end of the first resistor R1 is connected with the first end of the processor, and the second end of the first resistor R1 is connected with the inverting input end of the operational amplifier. The first end of the second resistor R2 is connected with the inverting input end of the operational amplifier, and the second end of the second resistor R2 is connected with the output end of the operational amplifier. The first end of the fourth resistor R4 is connected with the non-inverting input end of the operational amplifier, and the second end of the fourth resistor R4 is grounded. The output end of the operational amplifier is connected with the second end of the processor.
In some embodiments, the resistances of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 may be equal. In this implementation, the voltage at the output of the op-amp is equal to the difference between the voltage at the non-inverting input of the op-amp (i.e., the actual amplitude of the sense signal corresponding to each node) and the voltage at the inverting input of the op-amp (i.e., the target reference voltage corresponding to each node).
In some embodiments, the differential circuit may be further configured to amplify a difference between an actual amplitude of the sensing signal corresponding to the node and a target reference voltage to obtain a target difference value.
In this implementation, taking the differential circuit shown in fig. 5 as an example, the ratio of the first resistor R1 to the second resistor R2 may be equal to the ratio of the third resistor R3 to the fourth resistor R4. In this implementation, the voltage at the output of the operational amplifier can be represented by the following formula (1):
V0＝(R2/R1)＊(V2-V1) (1)
where V0 represents the voltage at the output of the operational amplifier, V2 represents the voltage at the non-inverting input of the operational amplifier (i.e., the actual amplitude of the sense signal corresponding to each node), and V1 represents the voltage at the inverting input of the operational amplifier (i.e., the target reference voltage corresponding to each node). By adjusting the ratio of the second resistor R2 to the first resistor R1, the amplification factor for amplifying the difference between the actual amplitude of the sensing signal corresponding to the node and the target reference voltage can be adjusted, so that the target difference value is obtained.
Taking the example that the touch device obtains the target reference voltage corresponding to each node after each power-up, fig. 6 is a schematic flow chart of another touch position detection method provided by the application. As shown in fig. 6, the method may include the steps of:
Step 1, the touch equipment is powered on and started, and the touch equipment sequentially drives each driving channel to emit square waves or sine waves with preset frequency.
After a certain charging time, the touch device may perform step 2.
Step 2, the touch equipment can acquire a first amplitude value of the induction signal corresponding to each node through the sampling circuit.
And 3, subtracting the expected amplitude from the first amplitude of the induction signal corresponding to each node by the touch equipment to obtain an initial reference voltage.
And 4, dividing the initial reference voltage by the touch equipment, and presetting the amplification factor to obtain a target reference voltage corresponding to each node.
And 5, continuously scanning the driving channel by the touch equipment according to a preset scanning rule.
And 6, inputting the actual amplitude of the sensing signal corresponding to each node and the target reference voltage corresponding to each node into a differential amplifying circuit to obtain the difference between the amplified actual amplitude and the target reference voltage.
And taking the difference between the amplified actual amplitude and the target reference voltage as the signal intensity of the sensing signal corresponding to the node.
Fig. 7 is a schematic diagram illustrating a comparison of the sensing signal before and after processing. As shown in fig. 7, VREF1 therein represents a target reference voltage (Voltage Reference, VREF) 1 corresponding to the node 1.VREF 2 represents the target VREF 2 corresponding to node 2. The strength of the induction signals of the nodes obtained by differencing the actual amplitude of the induction signals corresponding to the nodes with the target reference voltage corresponding to the nodes is equal to the expected amplitude, so that the strength of the induction signals of the nodes is equal.
For example, fig. 8 is a schematic diagram showing a comparison between the before and after processing of another sensing signal, as shown in fig. 8, the actual amplitude of the sensing signal corresponding to each node and the difference between the target reference voltages corresponding to each node are amplified by a preset multiple, and then the strength of the sensing signal of each node can be obtained to be equal to the expected amplitude, so that the strength of the sensing signal of each node is equal.
And 7, obtaining the signal intensity of the induction signals corresponding to each node on the whole touch component through an analog-digital converter (analog to digital converter, ADC).
And 8, determining the target position according to the positions of the nodes and the signal intensity of the sensing signals corresponding to the nodes.
For example, the touch device may calculate the position of each node and the signal strength of the sensing signal corresponding to each node by using a centroid algorithm or any other watershed algorithm, so as to determine the target position. The formula of the centroid algorithm may be shown in the following formula (2):
wherein C is centroid Representing the coordinates of the touch point (i.e. the coordinates of the target position), k representing the numbers of the sensing channels and the driving channels, n representing the numbers of the sensing channels and the driving channels (all integers) where the center point of the touch area is located, i representing the numbers of the i sensing channels and the i driving channels forward of the center point of the touch area, j representing the numbers of the j sensing channels and the j driving channels backward of the center point of the touch area, X k Indicating the location of any node, X k May be one-dimensional coordinates. C (C) k Representing the signal strength of the sense signal corresponding to any node.
In this embodiment, the target reference voltage corresponding to each node is obtained, and then the difference between the actual sensing signal output by each node and the target reference voltage is obtained. The difference between the actual sensing signals output by the nodes and the target reference voltage is equal to the expected amplitude, so that the amplitude of the sensing signals output by the nodes at different positions of the touch equipment is the same, the flatness of the touch equipment is improved, the algorithm debugging difficulty is reduced, the touch jump point and the line breakage probability are reduced, and the accuracy of touch position detection is also improved. In addition, the method also reduces the requirements on the manufacturing process of touch equipment manufacturers, improves the production yield of the touch equipment, and reduces the loss and the cost.
Fig. 9 is a schematic structural diagram of a touch position detecting device provided by the present application. As shown in fig. 9, the apparatus may include: a scanning module 21, an acquisition module 22, a processing module 23, and a response module 24. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the scanning module 21 is configured to control the touch sensing driving module to scan the N driving channels, so that each driving channel drives each sensing channel to output a sensing signal;
The acquisition module 22 is configured to acquire an actual amplitude of the sensing signal corresponding to each node;
and the processing module 23 is configured to obtain a touch detection result according to the difference between the actual amplitude of the sensing signal corresponding to each node and the target reference voltage corresponding to each node. For each node, the target reference voltage is used for representing a difference between a first amplitude of the sensing signal corresponding to the node and a desired amplitude of the sensing signal corresponding to the node; the expected amplitude values corresponding to the nodes are equal; the touch detection result is used for indicating that no touch exists or that a touch exists at a target position; the first amplitude is obtained by detecting the output induction signals of the nodes before the actual amplitude is acquired.
And the response module 24 is used for responding to the touch operation aiming at the target position when the touch detection result is used for representing that the target position has touch.
Optionally, the acquisition module 22 may be further configured to acquire a first amplitude of the sensing signal corresponding to each node. In this implementation manner, the processing module 23 is further configured to, for each of the nodes, obtain, according to a difference between the first amplitude of the sensing signal corresponding to the node and the desired amplitude of the sensing signal corresponding to the node, a target reference voltage corresponding to the node.
Optionally, the first amplitude of the sensing signal corresponding to each node is an amplitude amplified by the amplifying module after a preset multiple, and in this implementation manner, the processing module 23 is specifically configured to, for each node, obtain, according to a difference between the first amplitude of the sensing signal corresponding to the node and a desired amplitude of the sensing signal corresponding to the node, an initial reference voltage corresponding to the node; and obtaining a target reference voltage corresponding to the node according to the quotient of the initial reference voltage and the preset amplification factor.
Optionally, the processing module 23 is specifically configured to collect, after the touch device is powered on for the first time, a first amplitude of the sensing signal corresponding to each node, so as to obtain a target reference voltage corresponding to each node. Or, the processing module 23 is specifically configured to collect, after each power-up of the touch device, a first amplitude of the sensing signal corresponding to each node, so as to obtain a target reference voltage corresponding to each node. Or, the processing module 23 is specifically configured to collect, according to a preset update period, a first amplitude of the sensing signal corresponding to each node, so as to obtain a target reference voltage corresponding to each node.
Optionally, the touch device may further include a differential circuit, where each node is connected to a first end of the differential circuit, and the processor is connected to a second end of the differential circuit, where the differential circuit is configured to perform a difference on an actual amplitude of the sensing signal corresponding to each node and a target reference voltage, and output a target difference value. In this implementation manner, the processing module 23 is specifically configured to input, for each of the nodes, a target reference voltage corresponding to the node into the differential circuit; receiving the target difference value output by the differential circuit; and acquiring the touch detection result according to the target difference value corresponding to each node.
Optionally, the differential circuit is further configured to amplify a difference between an actual amplitude of the sensing signal corresponding to the node and a target reference voltage to obtain the target difference value.
The touch position detection device provided by the application is used for executing the embodiment of the touch position detection method, and the implementation principle and the technical effect are similar, and are not repeated.
The present application also provides a computer-readable storage medium, which may include: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk or an optical disk, etc., in which program codes may be stored, and in particular, the computer-readable storage medium stores program instructions for the methods in the above embodiments.
The present application also provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the touch device may read the execution instruction from the readable storage medium, and execution of the execution instruction by the at least one processor causes the touch device to implement the touch position detection method provided in the various embodiments described above.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application 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 or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
The foregoing description, for purposes of explanation, has been presented in conjunction with specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the embodiments to the precise forms disclosed above. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles and the practical application, to thereby enable others skilled in the art to best utilize the embodiments and various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. A touch device, the touch device comprising:
The display screen is used for displaying images;
a touch assembly, comprising: the touch sensing driving module, the driving electrode layer and the sensing electrode layer are positioned on the upper side of the display screen; the driving electrode layer comprises N driving channels; the induction electrode layer comprises M induction channels; k nodes exist between the N driving channels and the M sensing channels; n and M are integers greater than or equal to 2; the K is equal to the product of M and N;
a processor coupled to the display screen and the touch sensitive drive module, the processor configured to:
controlling the touch sensing driving module to scan the N driving channels so that each driving channel drives each sensing channel to output sensing signals;
collecting the actual amplitude of the induction signal corresponding to each node;
according to the actual amplitude of the induction signal corresponding to each node and the difference of the target reference voltage corresponding to each node, a touch detection result is obtained; for each node, the target reference voltage is used for representing a difference between a first amplitude of the sensing signal corresponding to the node and a desired amplitude of the sensing signal corresponding to the node; the expected amplitude values corresponding to the nodes are equal; the touch detection result is used for indicating that no touch exists or that a touch exists at a target position; the first amplitude is obtained by detecting the output induction signals of all the nodes before the actual amplitude is acquired;
And when the touch detection result is used for representing that the target position has touch, responding to touch operation aiming at the target position.
2. The touch device of claim 1, wherein the processor is configured to:
collecting first amplitude values of induction signals corresponding to the nodes;
and for each node, acquiring a target reference voltage corresponding to the node according to the difference between the first amplitude of the sensing signal corresponding to the node and the expected amplitude of the sensing signal corresponding to the node.
3. The touch device of claim 2, wherein the first amplitude of the sensing signal corresponding to each node is an amplitude amplified by a preset multiple by the amplifying module, and the processor is configured to:
for each node, acquiring an initial reference voltage corresponding to the node according to the difference between the first amplitude of the sensing signal corresponding to the node and the expected amplitude of the sensing signal corresponding to the node;
and obtaining a target reference voltage corresponding to the node according to the quotient of the initial reference voltage and the preset amplification factor.
4. A touch device according to claim 2 or 3, wherein the processor is configured to:
After the touch equipment is electrified for the first time, collecting a first amplitude value of an induction signal corresponding to each node so as to obtain a target reference voltage corresponding to each node; or alternatively, the process may be performed,
after the touch equipment is electrified each time, collecting a first amplitude value of an induction signal corresponding to each node so as to obtain a target reference voltage corresponding to each node; or alternatively, the process may be performed,
and acquiring a first amplitude of the induction signal corresponding to each node according to a preset updating period so as to acquire a target reference voltage corresponding to each node.
5. A touch device according to any of claims 1-3, further comprising a differential circuit, each node being connected to a first end of the differential circuit, the processor being connected to a second end of the differential circuit, the differential circuit being configured to differential an actual amplitude of the sense signal corresponding to each node, and a target reference voltage, and to output a target difference value, the processor being configured to:
inputting a target reference voltage corresponding to each node into the differential circuit;
receiving the target difference value output by the differential circuit;
and acquiring the touch detection result according to the target difference value corresponding to each node.
6. The touch device of claim 5, wherein the differential circuit is further configured to amplify a difference between an actual amplitude of the sensing signal corresponding to the node and a target reference voltage to obtain the target difference.
7. The method for detecting the touch position is characterized by being applied to touch equipment, and the touch equipment comprises the following steps: display screen, touch-control subassembly includes: the touch sensing driving module, the driving electrode layer and the sensing electrode layer are positioned on the upper side of the display screen; the driving electrode layer comprises N driving channels; the induction electrode layer comprises M induction channels; k nodes exist between the N driving channels and the M sensing channels; n and M are integers greater than or equal to 2; the K is equal to the product of M and N; the method comprises the following steps:
controlling the touch sensing driving module to scan the N driving channels so that each driving channel drives each sensing channel to output sensing signals;
collecting the actual amplitude of the induction signal corresponding to each node;
according to the actual amplitude of the induction signal corresponding to each node and the difference of the target reference voltage corresponding to each node, a touch detection result is obtained; for each node, the target reference voltage is used for representing a difference between a first amplitude of the sensing signal corresponding to the node and a desired amplitude of the sensing signal corresponding to the node; the expected amplitude values corresponding to the nodes are equal; the touch detection result is used for indicating that no touch exists or that a touch exists at a target position; the first amplitude is obtained by detecting the output induction signals of all the nodes before the actual amplitude is acquired;
And when the touch detection result is used for representing that the target position has touch, responding to touch operation aiming at the target position.
8. A touch position detection device, wherein the device is applied to a touch apparatus, the touch apparatus comprising: display screen, touch-control subassembly includes: the touch sensing driving module, the driving electrode layer and the sensing electrode layer are positioned on the upper side of the display screen; the driving electrode layer comprises N driving channels; the induction electrode layer comprises M induction channels; k nodes exist between the N driving channels and the M sensing channels; n and M are integers greater than or equal to 2; the K is equal to the product of M and N; the device comprises:
the scanning module is used for controlling the touch sensing driving module to scan the N driving channels so that each driving channel drives each sensing channel to output sensing signals;
the acquisition module is used for acquiring the actual amplitude of the induction signal corresponding to each node;
the processing module is used for acquiring a touch detection result according to the actual amplitude of the induction signal corresponding to each node and the difference of the target reference voltage corresponding to each node; for each node, the target reference voltage is used for representing a difference between a first amplitude of the sensing signal corresponding to the node and a desired amplitude of the sensing signal corresponding to the node; the expected amplitude values corresponding to the nodes are equal; the touch detection result is used for indicating that no touch exists or that a touch exists at a target position; the first amplitude is obtained by detecting the output induction signals of all the nodes before the actual amplitude is acquired;
And the response module is used for responding to the touch operation aiming at the target position when the touch detection result is used for representing that the target position has touch.
9. A computer readable storage medium having stored thereon computer executable instructions which, when executed by a processor, implement the method of claim 7.
10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the method of claim 7.
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