CN114063830B - Sensor, touch detection circuit, method and system - Google Patents
Sensor, touch detection circuit, method and system Download PDFInfo
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- CN114063830B CN114063830B CN202010756455.1A CN202010756455A CN114063830B CN 114063830 B CN114063830 B CN 114063830B CN 202010756455 A CN202010756455 A CN 202010756455A CN 114063830 B CN114063830 B CN 114063830B
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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
- G06F3/0447—Position sensing using the local deformation of sensor cells
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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
- G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
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Abstract
A sensor, touch detection circuit, method and system, wherein the sensor comprises: a capacitive substrate; one or more pole plate pairs arranged at intervals, wherein each pole plate pair comprises 2 pole plates; the electrode plate pairs comprise 2 electrode plates which are respectively arranged at the opposite positions of the upper surface and the lower surface of the capacitor base material to form a pair of electrode plates of the capacitor, and each electrode plate comprises a sensitive grid with the resistance value changing along with the action of external force.
Description
Technical Field
The present disclosure relates to sensor detection technology, and more particularly, to a sensor, a touch detection circuit, a method, and a system.
Background
Two conductors close to each other with a layer of non-conductive insulating medium sandwiched between them, constitute a capacitor. When a voltage is applied between the two plates of the capacitor, the capacitor stores a charge. The capacitance of the capacitor is equal to the ratio of the amount of charge on one conductive plate to the voltage between the two plates. Taking a parallel plate capacitor as an example, the calculation formula of the capacitance C isWherein U A-UB is the potential difference between the two parallel plates, ε r is the relative dielectric constant, k is the electrostatic force constant, S is the facing area of the two plates, and d is the distance between the two plates.
A strain gauge sensor is a sensor based on measuring the strain created by the deformation of an object under force. Resistive strain gages are the most commonly used sensing elements. It is a sensing element that converts a change in strain on a mechanical member into a change in resistance. The basic construction of the resistive strain gage is shown in fig. 1, and is generally composed of a sensing grid, a substrate, a lead wire connected with the sensing grid, a cover layer, and the like. The sensitive grid can be made of metal wires or foil resistors.
Piezoresistive sensors refer to sensors made using the piezoresistive effect of monocrystalline silicon material and integrated circuit technology. The resistivity of the monocrystalline silicon material changes upon application of a force.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein.
The embodiment of the application provides a sensor, a touch detection circuit, a touch detection method and a touch detection system, which can simultaneously realize the functions of a capacitance sensor, a strain sensor and a piezoresistive sensor through the sensor.
The sensor provided by the embodiment of the application comprises: a capacitive substrate;
One or more pole plate pairs arranged at intervals, wherein each pole plate pair comprises 2 pole plates; the electrode plate pairs comprise 2 electrode plates which are respectively arranged at the opposite positions of the upper surface and the lower surface of the capacitor base material to form a pair of electrode plates of the capacitor, and each electrode plate comprises a sensitive grid with the resistance value changing along with the action of external force.
The sensor provided by the embodiment of the application can realize the functions of the capacitance, the strain type and the piezoresistive sensor at the same time.
The touch detection circuit provided by the embodiment of the application comprises:
one or more sensors as described in the previous embodiments;
The first switch module is connected with the sensor, the resistance variation detection module and the capacitance variation detection module and is set to work in a first on-off state and a second on-off state in a time-sharing mode; connecting a resistance wiring terminal of the sensor with a resistance variation detection module in a first on-off state, so that the touch detection circuit works in a resistance detection mode; connecting a capacitance terminal of the sensor with a capacitance variation detection module in a second on-off state, so that the touch detection circuit works in a capacitance detection mode;
a resistance change amount detection module configured to detect a resistance change amount of the sensor;
and the capacitance change amount detection module is used for detecting the capacitance change amount of the sensor.
The touch detection circuit provided by the embodiment of the application can provide the functions of resistance variation detection and capacitance variation detection.
The embodiment of the application provides a touch detection method based on the touch detection circuit described in the previous embodiment, wherein the sensor is installed on the touch device, and the method comprises the following steps:
controlling the first switch module to be in a second on-off state, so that the touch detection circuit works in a capacitance detection mode;
In a capacitance detection mode, after the touch control equipment is determined to be touched according to the capacitance variation obtained by the touch detection circuit, the first switch module is controlled to work in a first on-off state and a second on-off state in a time-sharing mode, so that the touch detection circuit works in a resistance detection mode and a capacitance detection mode in a time-sharing mode;
in the capacitance detection mode, determining the contact position according to the capacitance variation and the capacitance position; and in the resistance detection mode, determining the touch strength according to the resistance variation acquired by the touch detection circuit.
The touch detection method provided by the embodiment of the application can detect the resistance variation detection and the capacitance variation.
The touch detection system provided by the embodiment of the application comprises:
the touch detection circuit as described in the previous embodiment;
and a controller connected to the touch detection circuit, the controller performing the steps of the touch detection method as described in the previous embodiment.
Another touch detection circuit provided in an embodiment of the present application includes:
the sensor comprises a polar plate formed by a sensitive grid with a resistance value changing along with the action of external force, wherein the polar plate forms one polar plate of a capacitor, a pair of resistance terminals connected with two ends of the sensitive grid, and a capacitor terminal connected with one end of the sensitive grid;
The switch module is connected with the sensor, the resistance variation detection module and the capacitance variation detection module and is set to work in a first on-off state and a second on-off state in a time-sharing mode; connecting a resistance wiring terminal of the sensor with a resistance variation detection module in a first on-off state, so that the touch detection circuit works in a resistance detection mode; connecting a capacitance terminal of the sensor with a capacitance variation detection module in a second on-off state, so that the touch detection circuit works in a capacitance detection mode;
a resistance change amount detection module configured to detect a resistance change amount of the sensor;
and the capacitance change amount detection module is used for detecting the capacitance change amount of the sensor.
The touch detection circuit provided by the embodiment of the application can provide the functions of resistance variation detection and capacitance variation detection.
The embodiment of the application provides a touch detection method based on the touch detection circuit described in the previous embodiment, wherein the sensor is installed on the touch device, and the method comprises the following steps:
The switch module is controlled to be in a second on-off state, so that the touch detection circuit works in a capacitance detection mode;
In a capacitance detection mode, after the touch control equipment is determined to be touched according to the capacitance variation obtained by the touch detection circuit, the switch module is controlled to work in a first on-off state and a second on-off state in a time-sharing mode, so that the touch detection circuit works in a resistance detection mode and a capacitance detection mode in a time-sharing mode;
And in the resistance detection mode, determining the touch strength according to the resistance variation acquired by the touch detection circuit.
The touch detection method provided by the embodiment of the application can detect the resistance variation detection and the capacitance variation.
The touch detection system provided by the embodiment of the application comprises:
Another touch detection circuit as described in the previous embodiment;
and a controller connected to the touch detection circuit, the controller performing the steps of the touch detection method as described in the previous embodiment.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. Other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
Other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description.
Drawings
The accompanying drawings are included to provide an understanding of the principles of the application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain, without limitation, the principles of the application.
FIG. 1 is a schematic illustration of the basic construction of a resistive strain gauge in some of the techniques;
FIG. 2 is a schematic diagram of a sensor according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a plate composed of a sensing grid in a sensor according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating deformation of a polar plate when an external object touches a touch device where a sensor is installed according to an embodiment of the present application;
fig. 5 is a schematic diagram of a first switch module according to an embodiment of the present application for connecting a sensitive gate in a first on-off state;
FIG. 6 is a schematic diagram of a resistive bridge formed by connecting sensitive gates on 2 pairs of plates according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a resistance variation detecting module according to an embodiment of the present application;
Fig. 8 is a schematic diagram of a first switch module according to an embodiment of the present application connecting a sensitive gate in a second on-off state;
Fig. 9 is a schematic diagram of a connection intention of a second switch module provided in an embodiment of the present invention to the capacitance change amount detection module when the first switch module is in a second on/off state;
FIG. 10 is a flowchart of a touch detection method based on the touch detection circuit provided by the embodiment of the invention;
FIG. 11 is a schematic diagram illustrating a touch detection system according to an embodiment of the present application;
FIG. 12 is a schematic diagram of another touch detection circuit according to an embodiment of the present application;
Fig. 13 is a schematic diagram of another touch detection system according to an embodiment of the present application.
Detailed Description
The present application has been described in terms of several embodiments, but the description is illustrative and not restrictive, and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the described embodiments. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or in place of any other feature or element of any other embodiment unless specifically limited.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The disclosed embodiments, features and elements of the present application may also be combined with any conventional features or elements to form a unique inventive arrangement as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive arrangements to form another unique inventive arrangement as defined in the claims. It is therefore to be understood that any of the features shown and/or discussed in the present application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be restricted except in light of the attached claims and their equivalents. Further, various modifications and changes may be made within the scope of the appended claims.
Furthermore, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other sequences of steps are possible as will be appreciated by those of ordinary skill in the art. Accordingly, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Furthermore, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.
An embodiment of the present application provides a sensor including:
A capacitive substrate;
One or more pole plate pairs arranged at intervals, wherein each pole plate pair comprises 2 pole plates; the electrode plate pairs comprise 2 electrode plates which are respectively arranged at the opposite positions of the upper surface and the lower surface of the capacitor base material to form a pair of electrode plates of the capacitor, and each electrode plate comprises a sensitive grid with the resistance value changing along with the action of external force.
The sensitive grid can be a sensitive grid formed by metal conductors, and the resistance value of the metal conductors changes along with the mechanical deformation of the metal conductors under the action of external force; the sensitive grid can also be composed of a high molecular resistance type semiconductor material, and the resistivity of the semiconductor material changes along with the change of the external force applied to the semiconductor material.
The electrode plate pair of the sensor can also comprise a covering layer, and the process can refer to the production process of the strain type sensor.
FIG. 2 shows a schematic diagram of a sensor according to this embodiment, where 201 represents a capacitive substrate, and 202-1, 202-2, 202-3, and 202-4 are 4 plates, where 202-1 and 202-2 are a plate pair, and 202-3 and 202-4 are a plate pair, each plate pair forming a pair of plates of a capacitor.
In an exemplary embodiment, the sensor may further include:
at least one pair of capacitor terminals, each pair of capacitor terminals being connected to a pair of plates of the same capacitor, different plates being connected to different capacitor terminals;
At least one pair of resistor terminals, each pair of resistor terminals is connected to two ends of the sensitive grid of the same polar plate, and different polar plates are connected with different pairs of resistor terminals, wherein the sensitive grid of each polar plate comprises one sensitive grid or a plurality of sensitive grids connected in series;
the capacitor terminals of one of the plate connections share a resistor terminal of the plate connection or are different from the resistor terminal of the plate connection.
Fig. 3 shows a schematic diagram of a plate composed of a sensing grid in the sensor according to this embodiment, where d represents a distance between two plates, l is a length of the sensing grid, and w is a width of the sensing grid. When an external object touches the touch device where the sensor is installed, the capacitance value of the capacitor formed by the polar plates changes, and the capacitor terminal in the embodiment can be connected with the capacitance change amount detection circuit to measure the change of the capacitance value, and whether the external object touches the touch device where the sensor is installed or not is judged according to the change of the capacitance value. In addition, when an external object touches the touch device, the length of the sensitive grid on the polar plate is deformed (lx before touching is changed to ly after touching), the width is basically unchanged, and the distance between the polar plate pair consisting of polar plates is also changed (dx before touching is changed to dy after touching), as shown in fig. 4, the resistance terminal in the above embodiment can be connected with the resistance change amount detection circuit to measure the change of the resistance value, and the magnitude of the external force received can be determined according to the change of the resistance value.
The sensor provided by the embodiment of the application can realize the functions of the capacitance sensor, the strain sensor and the piezoresistive sensor at the same time. Because the position of the contact is detected by using the capacitor more accurately, the touch force is measured by using the strain sensor or the piezoresistive sensor more accurately, and the sensor provided by the embodiment of the application provides possibility for simultaneously and accurately judging the position of the contact and detecting the touch force.
The embodiment of the application also provides a touch detection circuit, which comprises:
one or more sensors as described in the previous embodiments comprising capacitive and resistive terminals;
The first switch module is connected with the sensor, the resistance variation detection module and the capacitance variation detection module and is set to work in a first on-off state and a second on-off state in a time-sharing mode; connecting a resistance wiring terminal of the sensor with a resistance variation detection module in a first on-off state, so that the touch detection circuit works in a resistance detection mode; connecting a capacitance terminal of the sensor with a capacitance variation detection module in a second on-off state, so that the touch detection circuit works in a capacitance detection mode;
a resistance change amount detection module configured to detect a resistance change amount of the sensor;
and the capacitance change amount detection module is used for detecting the capacitance change amount of the sensor.
The touch detection circuit provided by the embodiment of the application can simultaneously realize the functions of detecting capacitance change and resistance change by using the sensor provided by the embodiment of the application.
In an exemplary embodiment, the touch detection circuit includes 2 plate pairs belonging to one of the sensors having 2 plate pairs or to 2 of the sensors having a single plate pair;
The first switch module is arranged to connect the sensitive grids of the 2 pole plate pairs into a resistance bridge under a first on-off state, connect a pair of opposite angles of the resistance bridge to the resistance change amount detection module, and connect the other pair of opposite angles to the two poles of the direct current power supply, wherein the sensitive grids on two opposite bridge arms of the resistance bridge belong to the same pole plate pair; and the two poles of the 2 capacitors formed by the 2 pole plate pairs are respectively connected with the capacitance variation detection module in a second on-off state.
FIG. 5 is a schematic diagram of a first switch module connecting sensitive gates in a first on-off state, where R1 and R3 are 2 sensitive gates in one pair of plates and R2 and R4 are 2 sensitive gates in the other pair of plates; the two resistance terminals of the sensitive grid R1 are respectively connected with the port 1 of the first switch module and the port 6 of the first switch module, the two resistance terminals of the sensitive grid R4 are respectively connected with the port 11 of the first switch module and the port 6 of the first switch module, the port 6 of the first switch module is also connected with one end of the resistance change amount detection module, the port 1 of the first switch module is connected with the power supply VDD, and the port 11 of the first switch module is connected with the power supply VEE; the two resistance terminals of the sensitive gate R2 are respectively connected with the port 3 of the first switch module and the port 9 of the first switch module, the two resistance terminals of the sensitive gate R3 are respectively connected with the port 13 of the first switch module and the port 9 of the first switch module, the port 9 of the first switch module is also connected with the other end of the resistance change amount detection module, the port 3 of the first switch module is connected with the power supply VDD, and the port 13 of the first switch module is connected with the power supply VEE. The resistive bridge formed by connecting the sensitive gates of the 2 polar plate pairs after connection according to fig. 5 is shown in fig. 6. Sr+ and SR-in fig. 5 and 6 are two input ports of the resistance change amount detection module.
In the above embodiment, the resistance change amount detection module is configured to detect the resistance change amount of the sensor based on the received diagonal voltage difference. Fig. 7 shows a schematic diagram of a resistance change amount detection module, Δsr=sr+ -SR- = (vr+ -VR-)/RG, where Δsr represents a change amount of a resistance value of a sensitive gate caused by a touch device on which a touch sensor is mounted, and a touch force can be calculated according to Δsr. RG represents an adjustable resistor for adjusting the brightness; VR+, VR-represent positive and negative voltages across the resistor bridge circuit.
FIG. 8 is a schematic diagram of the first switch module connecting the sensitive gates in the second on-off state, where R1 and R3 are 2 sensitive gates in one pair of plates and R2 and R4 are 2 sensitive gates in the other pair of plates; the two resistance terminals of the sensitive gate R1 are respectively connected with the port 2 of the first switch module and the port 7 of the first switch module, the two resistance terminals of the sensitive gate R4 are respectively connected with the port 5 of the first switch module and the port 12 of the first switch module, the port 5 and the port 7 of the first switch module are in a disconnection state, the port 2 of the first switch module is connected with the capacitance variation detection module, and the port 12 of the first switch module is connected with the capacitance variation detection module; the two resistance terminals of the sensitive gate R2 are respectively connected with the port 4 of the first switch module and the port 10 of the first switch module, the two resistance terminals of the sensitive gate R3 are respectively connected with the port 8 of the first switch module and the port 14 of the first switch module, the port 8 and the port 10 of the first switch module are in a disconnection state, the port 4 of the first switch module is connected with the capacitance change amount detection module, and the port 14 of the first switch module is connected with the capacitance change amount detection module. The resistor terminal connected to the port 2 of the first switch module and the resistor terminal connected to the port 14 of the first switch module in fig. 7 constitute a pair of capacitor terminals, and the capacitor terminals are connected to the capacitance variation detecting module to measure the capacitance variation of the capacitor C2; the resistive terminal connected to port 12 of the first switch module and the resistive terminal connected to port 4 of the first switch module form another pair of capacitive terminals that are connected to the capacitance change amount detection module to measure the capacitance change amount of capacitance C1.
In an exemplary embodiment, the touch detection circuit further includes:
The second switch module is connected between the first switch module and the capacitance variation detection module and is used for connecting the two poles of different capacitances with the capacitance variation detection module when the first switch module is in a second on-off state so that the capacitance variation detection modules respectively detect capacitance variation of 2 capacitances.
Fig. 9 is a schematic diagram of a connection between a second switch module and the capacitance change amount detection module when the first switch module is in a second on-off state according to an embodiment of the present application. When the capacitance change amount of the C1 is to be measured, connecting the two poles of the C1 with the capacitance change amount detection module through the second switch module, and disconnecting the two poles of the C2 from the capacitance change amount detection module; when the capacitance change amount of the C2 is to be measured, the two poles of the C2 are connected with the capacitance change amount detection module through the second switch module, and meanwhile, the two poles of the C2 are disconnected with the capacitance change amount detection module. According to the embodiment of the application, the alternating signal can pass through the capacitance variation detection module, and the variation of the capacitance is determined according to the variation of the alternating signal 1 output by the capacitance variation detection module relative to the input alternating signal under the action of the capacitance C1 or the capacitance C2.
The switch module in the touch detection circuit according to the embodiment of the application may be an analog switch unit array.
The embodiment of the application also provides a touch detection method based on any one of the touch detection circuits, wherein a sensor in the touch detection circuit is arranged on the touch equipment, as shown in fig. 10, and the method comprises the following steps:
step S1001 controls the first switch module to be in a second on-off state, so that the touch detection circuit works in a capacitance detection mode;
step S1002 is in a capacitance detection mode, and after determining that the touch device is touched according to the capacitance variation obtained by the touch detection circuit, the first switch module is controlled to operate in a first on-off state and a second on-off state in a time-sharing manner, so that the touch detection circuit operates in a resistance detection mode and a capacitance detection mode in a time-sharing manner;
in the capacitance detection mode, determining the contact position according to the capacitance variation and the capacitance position; and in the resistance detection mode, determining the touch strength according to the resistance variation acquired by the touch detection circuit.
In an exemplary embodiment, determining the contact position based on the capacitance variation and the capacitance position includes:
And under the capacitance detection mode, acquiring capacitance variation of different capacitances in the sensor in turn through the second switch module, and taking the position of the capacitance generating the variation as the contact position when the capacitance variation exceeds a preset threshold value.
In an exemplary embodiment, the method further comprises: in the capacitive detection mode, after the touch is released according to the capacitance variation, the first switch module is controlled to work in a second on-off state, so that the touch detection circuit works in the capacitive detection mode.
Determining that the touch has been released from the amount of capacitance change may include: and after the capacitance variation is restored to the initial power-on state, determining that the touch is released.
The method described in the above embodiment is described below with a specific application example.
Step one, a first switch module in a touch detection circuit is controlled to be in a second on-off state, so that the touch detection circuit works in a capacitance detection mode;
switching connection ports of a second switch module at a certain frequency in a capacitance detection mode to enable different capacitances in the touch detection circuit to be in time-sharing connection with a capacitance variation detection module;
Step three, when the change amount of the alternating signal output by the capacitance change amount detection module relative to the alternating signal input by the capacitance change amount detection module is detected to be larger than a preset threshold value, determining that the touch equipment is touched, wherein the position of the contact is the position of a polar plate corresponding to the capacitance connected by the capacitance change amount detection module at the moment, and executing the step four; when the change amount of the alternating signal output by the capacitance change amount detection module relative to the alternating signal input by the capacitance change amount detection module is detected to be smaller than or equal to a preset threshold value, determining that the touch equipment is not touched, and returning to the execution step two;
Step four, controlling the first switch module to work in a resistance detection mode, calculating the touch force according to the variable quantity of the resistance value in the resistance detection mode, and returning to the step one if the touch force is calculated;
By repeatedly executing the first to fourth steps, it can be determined whether the contact position and the touch force of the external object contacting the touch device have changed.
The embodiment of the invention also provides a touch detection system, as shown in fig. 11, which comprises:
the touch detection circuit of any of the previous embodiments;
And a controller coupled to the touch detection circuit, the controller performing the steps of the touch detection method as described in any of the previous embodiments.
The embodiment of the invention also provides a touch detection circuit, which comprises:
the sensor comprises a polar plate formed by a sensitive grid with a resistance value changing along with the action of external force, wherein the polar plate forms one polar plate of a capacitor, a pair of resistance terminals connected with two ends of the sensitive grid and a capacitor terminal connected with the polar plate;
The switch module is connected with the sensor, the resistance variation detection module and the capacitance variation detection module and is set to work in a first on-off state and a second on-off state in a time-sharing mode; connecting a resistance wiring terminal of the sensor with a resistance variation detection module in a first on-off state, so that the touch detection circuit works in a resistance detection mode; connecting a capacitance terminal of the sensor with a capacitance variation detection module in a second on-off state, so that the touch detection circuit works in a capacitance detection mode;
a resistance change amount detection module configured to detect a resistance change amount of the sensor;
and the capacitance change amount detection module is used for detecting the capacitance change amount of the sensor.
In this embodiment, the plate composed of the sensitive grating in the sensor forms one plate of the capacitor, and when the touch device mounted on the sensor is touched by an external object (such as a human body), the external object forms the other plate of the capacitor.
Fig. 12 provides a schematic diagram of a partial touch detection circuit according to an embodiment of the present application, where a switch S1 in the switch module controls on/off of the sensor and the capacitance change amount detection module, and switches S2-1 and S2-2 in the switch module control on/off of the sensor and the resistance change amount detection module. In the state that the switch S1 is closed, the switch S2-1 and the switch S2-2 are opened, detecting the capacitance variation through the capacitance variation detection module, and further determining whether an external object touches the touch control equipment where the sensor is installed or not based on the capacitance variation; in the state that the switch S1 is opened and the switches S2-1 and S2-2 are closed, the resistance change amount is determined through the resistance change amount detection module, and then the touch force can be determined based on the resistance change amount.
The embodiment of the invention also provides a touch detection method based on the touch detection circuit, wherein the sensor is arranged on the touch equipment, and the method comprises the following steps:
The switch module is controlled to be in a second on-off state, so that the touch detection circuit works in a capacitance detection mode;
In a capacitance detection mode, after the touch control equipment is determined to be touched according to the capacitance variation obtained by the touch detection circuit, the switch module is controlled to work in a first on-off state and a second on-off state in a time-sharing mode, so that the touch detection circuit works in a resistance detection mode and a capacitance detection mode in a time-sharing mode;
And in the resistance detection mode, determining the touch strength according to the resistance variation acquired by the touch detection circuit.
In an exemplary embodiment, determining that the touch device is touched according to the capacitance variation acquired by the touch detection circuit includes:
In the capacitance detection mode, the capacitance variation is acquired according to the touch detection circuit, and when the capacitance variation exceeds a preset threshold, the touch control equipment is determined to be touched.
In an exemplary embodiment, the method further comprises: in the capacitive detection mode, after the touch is released according to the capacitance variation, the switch module is controlled to work in a second on-off state, so that the touch detection circuit works in the capacitive detection mode.
The embodiment of the invention also provides a touch detection system, as shown in fig. 13, which comprises:
A touch detection circuit as described above;
and a controller connected to the touch detection circuit, the controller performing the steps of the touch detection method as described in the previous embodiment.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
Claims (15)
1. A sensor is characterized in that, the sensor includes:
A capacitive substrate;
One or more pole plate pairs arranged at intervals, wherein each pole plate pair comprises 2 pole plates; the electrode plate pairs comprise 2 electrode plates which are respectively arranged at the opposite positions of the upper surface and the lower surface of the capacitor base material to form a pair of electrode plates of the capacitor, and each electrode plate comprises a sensitive grid with the resistance value changing along with the action of external force.
2. The sensor of claim 1, further comprising:
at least one pair of capacitor terminals, each pair of capacitor terminals being connected to a pair of plates of the same capacitor, different plates being connected to different capacitor terminals;
At least one pair of resistor terminals, each pair of resistor terminals is connected to two ends of the sensitive grid of the same polar plate, and different polar plates are connected with different pairs of resistor terminals, wherein the sensitive grid of each polar plate comprises one sensitive grid or a plurality of sensitive grids connected in series;
the capacitor terminals of one of the plate connections share a resistor terminal of the plate connection or are different from the resistor terminal of the plate connection.
3. A touch detection circuit, the touch detection circuit comprising:
one or more sensors as claimed in claim 2;
The first switch module is connected with the sensor, the resistance variation detection module and the capacitance variation detection module and is set to work in a first on-off state and a second on-off state in a time-sharing mode; connecting a resistance wiring terminal of the sensor with a resistance variation detection module in a first on-off state, so that the touch detection circuit works in a resistance detection mode; connecting a capacitance terminal of the sensor with a capacitance variation detection module in a second on-off state, so that the touch detection circuit works in a capacitance detection mode;
a resistance change amount detection module configured to detect a resistance change amount of the sensor;
and the capacitance change amount detection module is used for detecting the capacitance change amount of the sensor.
4. A touch detection circuit according to claim 3, wherein:
The touch detection circuit includes 2 pairs of plates, the 2 pairs of plates belonging to one of the sensors having 2 pairs of plates, or to 2 of the sensors having a single pair of plates;
The first switch module is arranged to connect the sensitive grids of the 2 pole plate pairs into a resistance bridge under a first on-off state, one pair of opposite angles of the resistance bridge is connected to the resistance change amount detection module, the other pair of opposite angles of the resistance bridge is connected to two poles of the direct current power supply, and the sensitive grids on two opposite bridge arms of the resistance bridge belong to the same pole plate pair; and the two poles of the 2 capacitors formed by the 2 pole plate pairs are respectively connected with the capacitance variation detection module in a second on-off state.
5. The touch detection circuit of claim 4, wherein the touch detection circuit further comprises:
The second switch module is connected between the first switch module and the capacitance variation detection module, and is arranged to connect the two poles of different capacitors with the capacitance variation detection module when the first switch module is in a second on-off state, so that the capacitance variation detection modules respectively detect the capacitance variation of the 2 capacitors.
6. The touch detection circuit of claim 4 or 5, wherein,
The resistance change amount detection module is configured to detect a resistance change amount of the sensor based on the received pair of diagonal voltage differences.
7. A touch detection method based on the touch detection circuit of any one of claims 3 to 6, the sensor being mounted on a touch device, the method comprising:
controlling the first switch module to be in a second on-off state, so that the touch detection circuit works in a capacitance detection mode;
In a capacitance detection mode, after the touch control equipment is determined to be touched according to the capacitance variation obtained by the touch detection circuit, the first switch module is controlled to work in a first on-off state and a second on-off state in a time-sharing mode, so that the touch detection circuit works in a resistance detection mode and a capacitance detection mode in a time-sharing mode;
in the capacitance detection mode, determining the contact position according to the capacitance variation and the capacitance position; and in the resistance detection mode, determining the touch strength according to the resistance variation acquired by the touch detection circuit.
8. The touch detection method according to claim 7, wherein in the capacitance detection mode, determining the contact point position based on the capacitance variation amount and the capacitance position includes:
And under the capacitance detection mode, acquiring capacitance variation of different capacitances in the sensor in turn through the second switch module, and taking the position of the capacitance generating the capacitance variation as the contact position when the capacitance variation exceeds a preset threshold value.
9. The touch detection method according to claim 7 or 8, characterized in that the method further comprises:
In the capacitive detection mode, after the touch is released according to the capacitance variation, the first switch module is controlled to be in a second on-off state, so that the touch detection circuit works in the capacitive detection mode.
10. A touch detection system, the touch detection system comprising:
the touch detection circuit of any one of claims 3 to 6;
A controller connected to the touch detection circuit, the controller performing the steps of the touch detection method as claimed in any one of claims 7 to 9.
11. A touch detection circuit, the touch detection circuit comprising:
the sensor comprises a polar plate formed by a sensitive grid with a resistance value changing along with the action of external force, wherein the polar plate forms one polar plate of a capacitor, a pair of resistance terminals connected with two ends of the sensitive grid, and a capacitor terminal connected with one end of the sensitive grid;
The switch module is connected with the sensor, the resistance variation detection module and the capacitance variation detection module and is set to work in a first on-off state and a second on-off state in a time-sharing mode; connecting a resistance wiring terminal of the sensor with a resistance variation detection module in a first on-off state, so that the touch detection circuit works in a resistance detection mode; connecting a capacitance terminal of the sensor with a capacitance variation detection module in a second on-off state, so that the touch detection circuit works in a capacitance detection mode;
a resistance change amount detection module configured to detect a resistance change amount of the sensor;
and the capacitance change amount detection module is used for detecting the capacitance change amount of the sensor.
12. A touch detection method based on the touch detection circuit of claim 11, the sensor being mounted on a touch device, the method comprising:
The switch module is controlled to be in a second on-off state, so that the touch detection circuit works in a capacitance detection mode;
In a capacitance detection mode, after the touch control equipment is determined to be touched according to the capacitance variation obtained by the touch detection circuit, the switch module is controlled to work in a first on-off state and a second on-off state in a time-sharing mode, so that the touch detection circuit works in a resistance detection mode and a capacitance detection mode in a time-sharing mode;
And in the resistance detection mode, determining the touch strength according to the resistance variation acquired by the touch detection circuit.
13. The touch detection method according to claim 12, wherein in the capacitance detection mode, determining that the touch device is touched according to the capacitance variation amount acquired by the touch detection circuit includes:
In the capacitance detection mode, the capacitance variation is acquired according to the touch detection circuit, and when the capacitance variation exceeds a preset threshold, the touch control equipment is determined to be touched.
14. The touch detection method according to claim 12 or 13, characterized in that the method further comprises:
In the capacitive detection mode, after the touch is released according to the capacitance variation, the switch module is controlled to work in a second on-off state, so that the touch detection circuit works in the capacitive detection mode.
15. A touch detection system, the touch detection system comprising:
The touch detection circuit of claim 11;
a controller coupled to the touch detection circuit, the controller performing the steps of the touch detection method of any of claims 12 to 14.
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| US7236161B2 (en) * | 2003-03-21 | 2007-06-26 | 3M Innovative Properties Company | Remote touch simulation systems and methods |
| CN100420021C (en) * | 2005-04-07 | 2008-09-17 | 中国科学院电子学研究所 | Monolithic integrated temperature, humidity and pressure sensor chip based on polymer materials |
| CN100468018C (en) * | 2007-01-25 | 2009-03-11 | 西安交通大学 | An open type anti-eccentric load sensor with three elastic columns |
| EP2821949A3 (en) * | 2013-07-05 | 2015-02-25 | DR Gaming Technology Europe NV | Sensor for reading an identity code and gaming machine |
| CN104199579B (en) * | 2014-08-14 | 2017-09-08 | 上海中航光电子有限公司 | Capacitive touch control display device, touch detecting method and IC |
| KR102330585B1 (en) * | 2015-03-23 | 2021-11-24 | 엘지디스플레이 주식회사 | Touch screen device and method for driving thereof, and portable electronic device comprising the same |
| CN107702636A (en) * | 2016-08-09 | 2018-02-16 | 中兴通讯股份有限公司 | Curved detection method and device, terminal |
| CN111044206B (en) * | 2019-11-28 | 2021-08-10 | 北京遥测技术研究所 | MEMS capacitive air pressure sensor based on PN junction electrical isolation and anodic bonding technology |
| CN111006802B (en) * | 2019-12-17 | 2021-07-27 | 华中科技大学 | A Multimodal Variable Cell Flexible Sensor and Signal Acquisition System |
| CN111006801B (en) * | 2019-12-17 | 2021-02-09 | 华中科技大学 | Flexible variable-mode sensor for physiological information monitoring, application and preparation method |
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