CN113672110A - Contact detection method and system and touch device - Google Patents
Contact detection method and system and touch device Download PDFInfo
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- CN113672110A CN113672110A CN202010413913.1A CN202010413913A CN113672110A CN 113672110 A CN113672110 A CN 113672110A CN 202010413913 A CN202010413913 A CN 202010413913A CN 113672110 A CN113672110 A CN 113672110A
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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
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
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Abstract
A contact detection method, a system and a touch device are provided, wherein the method comprises the following steps: driving the device to vibrate by using a first elastic wave sensor arranged on the device as an excitation source to generate an elastic wave signal; detecting an elastic wave signal transmitted in the device by a second elastic wave sensor provided on the device; and comparing the difference between the detected elastic wave signal and a preset elastic wave signal, and judging whether the contact action on the device occurs or not according to the difference, wherein the preset elastic wave signal is a signal generated by driving the device to vibrate under the condition of no contact on the device.
Description
Technical Field
The present disclosure relates to touch technologies, and particularly to a touch detection method and system and a touch device.
Background
With the continuous development of science and technology, touch devices have gradually entered into various living fields of people, such as touch mobile phones, touch computers, and touch automobile steering wheels. At present, in order to implement a touch function on a device, a common technical scheme for touch detection includes:
adopting a strain gauge type sensor to carry out contact detection; deformation generated when an object contacts the touch device can be detected by the strain gauge type sensor through the cantilever beam type structure, and then contact action is detected according to the deformation. The strain gauge type sensor needs a cantilever beam type structure, occupies a large volume, causes large and heavy size of the touch equipment, and has higher overall cost, which is contrary to the design trend that the touch equipment is increasingly light and thin.
Performing contact detection by adopting a piezoelectric sensor; when the touch device generates an elastic wave signal due to object contact, the elastic wave signal is detected through the piezoelectric sensor and converted into an electric signal, and whether contact action occurs or not is judged according to whether the electric signal is detected or not. The piezoelectric sensor can reduce the volume of the touch equipment, but the touch equipment is poor in stability of elastic wave signals generated by touch, and is easily interfered by the external environment, so that the touch equipment is not favorable for accuracy of contact detection.
Disclosure of Invention
The embodiment of the application provides a contact detection method, a contact detection system and a touch device, which can accurately detect a contact action.
The contact detection method provided by the embodiment of the application comprises the following steps:
driving the device to vibrate by using a first elastic wave sensor arranged on the device as an excitation source to generate an elastic wave signal;
detecting an elastic wave signal transmitted in the device by a second elastic wave sensor provided on the device;
and comparing the difference between the detected elastic wave signal and a preset elastic wave signal, and judging whether the contact action on the device occurs or not according to the difference, wherein the preset elastic wave signal is a signal generated by driving the device to vibrate under the condition of no contact on the device.
The contact detection method provided by the embodiment of the application can accurately detect the contact action.
The contact detection system that this application embodiment provided includes:
the first elastic wave sensor is arranged on the device and used as an excitation source and is arranged for driving the device to vibrate to generate an elastic wave signal;
a second elastic wave sensor disposed on the device and configured to detect an elastic wave signal transmitted in the device;
and the processor module is connected with the first elastic wave sensor and the second elastic wave sensor and is set as the step of the contact detection method.
The contact detection system provided by the embodiment of the application can accurately detect the contact action.
An embodiment of the present application further provides a touch device, where the touch device includes:
a housing;
the contact detection system as described above is configured to determine whether a contact action occurs on the housing, wherein the first elastic wave sensor and the second elastic wave sensor included in the contact detection system are disposed on the housing.
The touch device provided by the embodiment of the application can accurately detect the contact action.
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 the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
FIG. 1 is a flowchart of a method for detecting contact according to an embodiment of the present disclosure;
fig. 2 is a schematic view of a first elastic wave sensor and a second elastic wave sensor provided in an embodiment of the present application, which are different elastic wave sensors;
FIG. 3 is a schematic diagram of voltage signals with different amplitudes detected when excitation signals with different frequencies are input according to an embodiment of the present disclosure;
fig. 4 is a block diagram of a touch detection system according to an embodiment of the present application.
Detailed Description
The present application describes embodiments, but the description is illustrative rather than limiting 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 embodiments described herein. 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 instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in this application may also be combined with any conventional features or elements to form a unique inventive concept as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.
Further, 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 orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, 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 contact detection method, as shown in fig. 1, the method includes:
step S101, driving a device to vibrate by using a first elastic wave sensor arranged on the device as an excitation source to generate an elastic wave signal;
the elastic wave signal generated by the vibration of the device driven by the first elastic wave sensor is transmitted in the device and cannot penetrate through the device to be transmitted outside the device;
step S102, detecting an elastic wave signal transmitted in the device through a second elastic wave sensor arranged on the device;
step S103, comparing the difference between the detected elastic wave signal and a preset elastic wave signal, and judging whether the contact action on the device occurs according to the difference, wherein the preset elastic wave signal is a signal generated by driving the device to vibrate under the condition of no contact on the device.
The contact action described in the embodiment of the present application may be any one of pressing, clicking and sliding;
the elastic wave sensor described in the embodiments of the present application may be a sensor having piezoelectric effect and inverse piezoelectric effect, such as a piezoelectric sensor, and the types of the piezoelectric sensor may include a piezoelectric ceramic sensor, a piezoelectric thin film sensor, and a piezoelectric crystal sensor.
The first elastic wave sensor and the second elastic wave sensor in the embodiment of the present application may be the same elastic wave sensor or different elastic wave sensors. Fig. 2 is a schematic diagram showing the first elastic wave sensor and the second elastic wave sensor as different elastic wave sensors, in which 201 denotes a housing of the device, 202 denotes an elastic wave signal transmitted in the housing, 203 denotes the first elastic wave sensor, and 204 denotes the second elastic wave sensor. When the first elastic wave sensor and the second elastic wave sensor are the same elastic wave sensor, the two elastic wave sensors may operate in a time-sharing manner.
When an object (such as a human body) is in contact with the device, the transmission of the preset elastic wave signal in the device is influenced, and then the detected elastic wave signal and the preset elastic wave signal are different: when contact exists, the transmission of the preset elastic wave signal in the device is actually blocked, and the signal amplitude and the signal energy of the detected elastic wave signal are reduced relative to the preset elastic wave signal; the frequency of the detected elastic wave signal may also change from the frequency of the preset elastic wave signal due to the change of the transmission medium caused by the contact. The embodiment of the application utilizes the difference to judge whether the contact action on the device occurs.
The preset elastic wave signal in the embodiment of the application is generated by the elastic wave sensor, the signal is relatively stable, and the signal is easily distinguished from the interference signal, so that the accuracy of contact detection is guaranteed.
In an exemplary embodiment, comparing the difference of the detected elastic wave signal and the preset elastic wave signal includes: converting the detected elastic wave signal into a voltage signal; and comparing the voltage signal converted from the detected elastic wave signal with the preset voltage signal converted from the preset elastic wave signal in advance to obtain the difference. The difference may include: one or more of a difference in voltage signal amplitude, a difference in voltage signal energy, and a difference in voltage signal frequency.
Because the comparison between the electric signals is simpler and clearer, the comparison between the elastic wave signals is converted into the comparison between the voltage signals corresponding to the elastic wave signals, and the detection process is easier to operate and implement.
In an exemplary embodiment, determining whether a contact action on the device occurs according to the difference includes: and if the difference between the voltage signal converted from the detected elastic wave signal and the preset voltage signal pre-stored and converted from the preset elastic wave signal is greater than a preset threshold value, determining that the contact action on the device occurs.
The embodiment of the application presets the difference threshold value, so that the interference of the external environment can be further reduced, and the accuracy of contact detection is improved. If the external environment has temperature, humidity and other factor changes, or when a human body touches by mistake, the transmission of the preset elastic wave signal in the device can be influenced, so that the detected elastic wave signal and the preset elastic wave signal have small difference, and the condition that the contact action is judged by mistake due to the small difference can be avoided through a preset threshold value.
In an exemplary embodiment, driving the device to vibrate by using a first elastic wave sensor arranged on the device as an excitation source to generate an elastic wave signal includes:
determining a preset excitation signal of the first elastic wave sensor, wherein the preset excitation signal enables the first elastic wave sensor to serve as an excitation source to drive the device to vibrate to generate an elastic wave signal with a maximum amplitude value under the condition of no contact with the device;
and applying the determined preset excitation signal to the first elastic wave sensor, so that the first elastic wave sensor serves as an excitation source to drive the device to vibrate to generate an elastic wave signal.
The elastic wave signal generated in this embodiment is an elastic wave signal with a maximum amplitude generated by the first elastic wave sensor as an excitation source driving device vibrating under the action of the excitation signal, and at this time, once an object (such as a human body) is in contact with the device, the difference between the detected elastic wave signal and the generated elastic wave signal is more obvious, so that the accuracy of contact detection is further improved.
In an exemplary embodiment, the determining the preset excitation signal of the first elastic wave sensor includes:
inputting excitation signals with different frequencies within a preset frequency range to the first elastic wave sensor, so that the first elastic wave sensor drives the device to vibrate to generate a plurality of elastic wave signals with different amplitudes; detecting the elastic wave signals with different amplitudes through the second elastic wave sensor and converting the elastic wave signals into voltage signals with different amplitudes; when a voltage signal with the maximum amplitude is detected from the obtained voltage signals with different amplitudes, recording the frequency of an excitation signal which corresponds to the voltage signal with the maximum amplitude and is input to the first elastic wave sensor, and taking the excitation signal with the frequency as the preset excitation signal. The excitation signal in the embodiment of the present application may be an alternating voltage signal, and the amplitudes of a plurality of alternating voltage signals having different frequencies input to the first elastic wave sensor are the same.
In an exemplary embodiment, detecting a voltage signal having a maximum amplitude from among the obtained plurality of voltage signals having different amplitudes may include:
after voltage signals with all different amplitudes are obtained, detecting a voltage signal with the maximum amplitude from the voltage signals with all different amplitudes; or after the first voltage signal is obtained, recording the voltage signal as a voltage signal with the maximum amplitude;
and comparing the voltage signal with the recorded voltage signal with the maximum amplitude every time one voltage signal is obtained from the second obtained voltage signal, and recording the voltage signal as the voltage signal with the maximum amplitude if the amplitude of the voltage signal is greater than that of the recorded voltage signal with the maximum amplitude until the last voltage signal is obtained.
As shown in fig. 3, which is a schematic diagram of voltage signals with different amplitudes detected by inputting excitation signals with different frequencies under the condition of no contact with the device, it can be seen that the amplitude of the elastic wave signal generated by the first elastic wave sensor is the largest under the action of the excitation signal with the frequency F1, and in the embodiment of the present application, the excitation signal with the frequency F1 may be used as the preset excitation signal.
In an exemplary embodiment, determining the preset excitation signal of the first elastic wave sensor includes one or more of:
when the device leaves a factory, determining a preset excitation signal of the first elastic wave sensor;
when the change of the external environment containing the device is detected, re-determining the preset excitation signal of the first elastic wave sensor; the external environment changing may include: the temperature, the humidity and other environmental parameters of the external environment where the touch equipment is located change; whether the environmental parameters change or not can be judged by detecting the numerical values recorded by corresponding sensors arranged on the touch equipment;
re-determining a preset excitation signal of the first elastic wave sensor when detecting that a hardware configuration containing the device is changed; the hardware configuration change of the touch device may include: changing hardware configurations (e.g., changing batteries, changing display screens, etc.), adding and reducing hardware configurations; the change of the hardware configuration can be determined by reading the relevant configuration file;
and when the preset time interval is detected to be reached, re-determining the preset excitation signal of the first elastic wave sensor.
The detection method provided by the embodiment of the application can be used for detecting the earphone in the ear, detecting the finger touch of touch equipment (such as electronic equipment and a touch steering wheel of a smart phone, a tablet personal computer and the like), and the like.
An embodiment of the present application further provides a contact detection system, as shown in fig. 4, the system includes:
a first elastic wave sensor 401 disposed on the device as an excitation source, configured to drive the device to vibrate to generate an elastic wave signal;
a second elastic wave sensor 402 disposed on the apparatus, configured to detect an elastic wave signal transmitted in the apparatus;
a processor module 403, connected to the first elastic wave sensor 401 and the second elastic wave sensor 402, configured to perform the steps of the aforementioned contact detection method.
The contact detection system can accurately detect contact actions.
An embodiment of the present application further provides a touch device, where the touch device includes:
a housing;
the contact detection system according to the foregoing embodiment is configured to determine whether a contact action occurs on the housing, wherein a first elastic wave sensor and a second elastic wave sensor included in the contact detection system are disposed on the housing.
The touch device can accurately detect the contact action.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between 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 by several physical components in cooperation. 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 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 is well known to those of ordinary skill 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 accessed by a computer. In addition, 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 as known to those skilled in the art.
Claims (10)
1. A contact detection method, comprising:
driving the device to vibrate by using a first elastic wave sensor arranged on the device as an excitation source to generate an elastic wave signal;
detecting an elastic wave signal transmitted in the device by a second elastic wave sensor provided on the device;
and comparing the difference between the detected elastic wave signal and a preset elastic wave signal, and judging whether the contact action on the device occurs or not according to the difference, wherein the preset elastic wave signal is a signal generated by driving the device to vibrate under the condition of no contact on the device.
2. The contact detection method according to claim 1, wherein driving the device to vibrate by using a first elastic wave sensor provided on the device as an excitation source to generate an elastic wave signal comprises:
determining a preset excitation signal of the first elastic wave sensor, wherein the preset excitation signal enables the first elastic wave sensor to serve as an excitation source to drive the device to vibrate to generate an elastic wave signal with a maximum amplitude value under the condition of no contact with the device;
and applying the determined preset excitation signal to the first elastic wave sensor, so that the first elastic wave sensor serves as an excitation source to drive the device to vibrate to generate an elastic wave signal.
3. The contact detection method according to claim 2,
determining a preset excitation signal of the first elastic wave sensor, comprising:
inputting excitation signals with different frequencies within a preset frequency range to the first elastic wave sensor, so that the first elastic wave sensor drives the device to vibrate to generate a plurality of elastic wave signals with different amplitudes;
detecting the elastic wave signals with different amplitudes through the second elastic wave sensor and converting the elastic wave signals into voltage signals with different amplitudes;
when a voltage signal with the maximum amplitude is detected from the obtained voltage signals with different amplitudes, recording the frequency of an excitation signal which corresponds to the voltage signal with the maximum amplitude and is input to the first elastic wave sensor, and taking the excitation signal with the frequency as the preset excitation signal.
4. The contact detection method according to claim 2, wherein determining a preset excitation signal of the first elastic wave sensor includes one or more of:
when the device leaves a factory, determining a preset excitation signal of the first elastic wave sensor;
when the change of the external environment of the device is detected, re-determining the preset excitation signal of the first elastic wave sensor;
when detecting that the hardware configuration of the device changes, re-determining the preset excitation signal of the first elastic wave sensor;
and when the preset time interval is detected to be reached, re-determining the preset excitation signal of the first elastic wave sensor.
5. The contact detection method according to any one of claims 1 to 4, wherein comparing the difference of the detected elastic wave signal and the preset elastic wave signal includes:
converting the detected elastic wave signal into a voltage signal;
and comparing the voltage signal converted from the detected elastic wave signal with the preset voltage signal converted from the preset elastic wave signal in advance to obtain the difference.
6. The contact detection method according to claim 5,
the differences include: one or more of a difference in voltage signal amplitude, a difference in voltage signal energy, and a difference in voltage signal frequency.
7. The method of claim 6, wherein determining whether a contact action on the device has occurred based on the difference comprises:
and if the difference between the voltage signal converted from the detected elastic wave signal and the preset voltage signal pre-stored and converted from the preset elastic wave signal is greater than a preset threshold value, determining that the contact action on the device occurs.
8. The contact detection method according to claim 7,
the first elastic wave sensor and the second elastic wave sensor are the same elastic wave sensor or different elastic wave sensors.
9. A contact detection system, characterized in that the system comprises:
the first elastic wave sensor is arranged on the device and used as an excitation source and is arranged for driving the device to vibrate to generate an elastic wave signal;
a second elastic wave sensor disposed on the device and configured to detect an elastic wave signal transmitted in the device;
a processor module, connected to said first and second elastic wave sensors, arranged to perform the steps of the contact detection method of any one of claims 1 to 8.
10. A touch device, comprising:
a housing;
the contact detection system according to claim 9, configured to determine whether a contact action has occurred on the housing, wherein the contact detection system comprises a first elastic wave sensor and a second elastic wave sensor disposed on the housing.
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| CN202010413913.1A CN113672110A (en) | 2020-05-15 | 2020-05-15 | Contact detection method and system and touch device |
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| CN202010413913.1A CN113672110A (en) | 2020-05-15 | 2020-05-15 | Contact detection method and system and touch device |
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