TW201826098A - Ultrasonic Sensing Apparatus, Ultrasonic Sensing Detecting Circuit Thereof, and Detecting Method Thereof - Google Patents

Abstract

An ultrasonic sensing apparatus includes a transmitting module, a receiving module, a detection circuit, and a controlled element. The transmitting module generates ultrasonic signals. The receiving module receives the ultrasonic signals reflected by an object, and generates a detecting signal. The detection circuit is electrically connected to the transmitting module and the receiving module. The detection circuit drives the transmitting module to generate the ultrasonic signal, receives the detecting signal, and determines whether a touch operation is effective based on phases and amplitudes of the ultrasonic signals and the reflected ultrasonic signals. When the touch operation is effective, the detection circuit outputs a touch sensing signal for driving the controlled element to execute a corresponding function. A detection circuit and a detection method thereof are also provided.

Description

Ultrasonic sensing device, detection circuit and detection method thereof

The invention relates to an ultrasonic sensing detection circuit, an ultrasonic sensing device with an ultrasonic sensing detection circuit, a detection circuit and a detection method thereof.

With the continuous development of electronic technology, most consumer electronic products such as mobile phones, portable computers, personal digital assistants (PDAs), tablet computers, and media players use touch sensing devices as input devices to make products more Friendly man-machine dialogue mode. The touch sensing device can be used as a touch switch instead of a mechanical switch, sensing a touch operation, or fingerprint recognition. According to the different touch principles, it can be divided into resistive touch sensor modules, capacitive touch sensor modules, infrared touch sensor modules, and ultrasonic touch sensor modules. The ultrasonic touch module includes an ultrasonic transmitting module, an ultrasonic receiving module, a signal reading unit and a signal detecting circuit. The ultrasonic transmitting module is used to generate ultrasonic waves. The ultrasonic receiving module receives the reflected ultrasonic waves and generates electrical signals according to the received reflected ultrasonic waves. The signal reading unit reads the electrical signals generated by the ultrasonic receiving module. Signal detection The circuit determines whether there is a touch action by detecting the amplitude change of the received electrical signal. When water droplets touch the ultrasonic sensing device, the amplitude of the received signal may change, which may cause false touch.

In view of this, it is necessary to provide an ultrasonic sensing device with improved touch accuracy.

It is also necessary to provide an ultrasonic sensor detection circuit that improves the accuracy of recognition.

It is also necessary to provide an ultrasonic device sensing detection method for improving recognition accuracy. An ultrasonic sensing device includes an ultrasonic transmitting module, an ultrasonic receiving module, a touch detection circuit and a controlled component. The ultrasonic transmitting module is used for generating ultrasonic waves. The ultrasonic receiving module is used for receiving ultrasonic waves reflected by the object to be measured, and generating a sensing signal accordingly. The touch detection circuit is electrically connected to the ultrasonic transmitting module and the ultrasonic receiving module at the same time. The touch detection circuit drives the ultrasonic transmitting module to generate ultrasonic waves, and receives the sensing signals output by the ultrasonic receiving module. It recognizes whether the current touch operation is valid according to the phase change and amplitude change of the sensing signal and the driving signal, and outputs when the touch operation is valid Touch the sensing signals to control the controlled components to perform corresponding operations.

An ultrasonic sensing detection circuit is electrically connected to an ultrasonic transmitting module, an ultrasonic receiving module, and a controlled component. The ultrasonic sensing detection circuit drives the ultrasonic transmitting module to generate ultrasonic waves, and receives the sensing signals output by the ultrasonic receiving module. The touch detection circuit includes a driving module, a phase detection module, an amplitude detection module, and a signal processing module. The driving module is electrically connected to the ultrasonic transmitting module and the phase detecting module, and is used to output a driving signal to the ultrasonic transmitting module and the phase detecting module. The phase detection module is electrically connected to the driving module and the ultrasonic receiving module, and is configured to generate a sensing phase difference value according to the phase change of the driving signal and the sensing signal. The amplitude detection module is electrically connected to the signal processing module, and is used to detect the amplitude of the sensing signal and output it to the signal processing module. The signal processing module judges whether the current touch operation is valid according to the amplitude of the sensing signal and the driving signal and the sensing phase difference, and outputs a touch sensing signal to control the controlled component to perform the corresponding operation when the touch operation is valid.

An ultrasonic sensing device detection method is used in an ultrasonic sensing device. The ultrasonic sensing device includes an ultrasonic transmitting module receiving a driving signal to generate an ultrasonic wave, the ultrasonic receiving module receiving an ultrasonic wave reflected by the object to be measured and correspondingly generating a sensing signal, an ultrasonic sensing detection circuit and a controlled component. The ultrasonic sensor detection circuit includes a phase detection module and an amplitude detection module. The ultrasonic sensing detection method includes the following steps:

Receive the sensing signal outputted by the driving signal and the ultrasonic receiving module;

Detect the phase and amplitude changes of the driving signal and the sensing signal to determine whether the current touch operation is valid;

If the touch operation is valid, a touch sensing signal is output to control the controlled component to perform the corresponding operation.

Using the above-mentioned ultrasonic sensing device, the phase and amplitude of the sensing signal generated by the ultrasonic conversion are simultaneously detected when the touch operation is recognized, and the change between the phase of the driving signal and the phase of the sensing signal is detected within a predetermined time. The touch accuracy of the ultrasonic sensing device is further improved, and the false touch of the ultrasonic sensing device by other substances such as water droplets, grease and metals is reduced.

The embodiments described below relate to an ultrasonic sensor, which can be an ultrasonic sensing device capable of sensing a single-point touch, or an ultrasonic transmission capable of sensing a multi-point touch. Sense device. A single-point ultrasonic sensing device includes a touch sensing switch that can be used to replace a mechanical switch, and the sensing device is used to output a signal characterizing a touch or proximity; and a multi-point ultrasonic The sensing device includes an ultrasonic touch sensing device or a biological (such as a fingerprint) identification device, and the sensing device is not only used to output a signal characterizing a touch or proximity, but also further analyzes the signal through Get the location where the touch occurred or get the situation to be measured. The detection circuit included in the ultrasonic sensing device referred to in this article can include the function of analyzing the properties of the object to be tested through signals output from the ultrasonic sensing device module to further determine whether a false touch has occurred.

In the following, a single-point ultrasonic sensing device and a multi-point ultrasonic sensing device are respectively taken as examples for description.

Please refer to FIG. 1, which is a schematic cross-sectional view of an ultrasonic sensing device 100 according to a first embodiment of the present invention. The ultrasonic sensing device 100 is a single-point ultrasonic sensing device.

The ultrasonic sensing device 100 includes a cover plate 10, an ultrasonic transmitting module 20, an ultrasonic receiving module 30, an ultrasonic sensing device detection circuit 200, and a controlled component 500.

The cover plate 10 is made of a transparent material, and is used to prevent impurities such as dust from entering the ultrasonic sensing device 100. In this embodiment, the cover plate 10 may be a glass substrate or other transparent substrates having high strength and high hardness, such as polycarbonate (PC), polyethylene terephthalate (Polythylene terephthalate, PET) ), Polymethylmethacrylate (PMMA), Cyclic Olefin Copolymer (COC) or Polyether sulfone (PES) and other materials.

The ultrasonic transmitting module 20 is adhered to the surface of the cover plate 10 by a first adhesive layer 12. The ultrasonic transmitting module 20 is used for generating ultrasonic waves, and may be a piezoelectric transmitter generating ultrasonic waves. The ultrasonic transmitting module 20 includes a first conductive layer 21, a second conductive layer 22, and a first piezoelectric layer 24 disposed between the first conductive layer 21 and the second conductive layer 22. The first conductive layer 21 is bonded to the cover plate 10 through the first adhesive layer 12, and is disposed on a surface of the first piezoelectric layer 24 near the cover plate 10. The first conductive layer 21 receives the generated driving signal. The second conductive layer 22 is disposed on a surface of the first piezoelectric layer 24 away from the cover plate 10. A voltage difference is formed between the first conductive layer 21 and the second conductive layer 22, so that a voltage is applied to the first piezoelectric layer 24 to expand or contract the first piezoelectric layer 24, thereby generating an ultrasonic wave. This ultrasonic wave can travel toward the object to be tested, pass through the cover plate 10, and further portions that are not absorbed or emitted by the object to be detected can be reflected so as to pass back through the cover plate 10 and received by the ultrasonic receiving module 30. In this embodiment, the second conductive layer 22 is grounded through a lead or a pin. The first conductive layer 21 and the second conductive layer 22 are made of a metal material, such as silver (Ag), copper (Cu), molybdenum (Mo), etc., but are not limited thereto. Can be other conductive materials. The first piezoelectric layer 24 is made of polyvinylidenefluoride (PVDF) material.

The ultrasonic receiving module 30 is adhered to the surface of the ultrasonic transmitting module 20 opposite to the cover plate 10 through the second adhesive layer 14.

The ultrasonic receiving module 30 is used for receiving ultrasonic waves reflected by the object to be measured and correspondingly converting them into local charges, and coupling the local charges into electrical signals and outputting the signals to the ultrasonic sensing device detection circuit 200. The electrical signal can be transmitted to the ultrasonic sensing device detection circuit 200 through a flexible circuit board or other conductive traces. The ultrasonic receiving module 30 includes a third conductive layer 31, a fourth conductive layer 32, and a second piezoelectric layer 34. The third conductive layer 31 is adhered to the surface of the second conductive layer 22 opposite to the cover plate 10 through the second adhesive layer 14, and is disposed near the second piezoelectric layer 34. The surface of the cover plate 10 is described. The third conductive layer 31 is grounded through a lead or a pin. The second piezoelectric layer 34 receives the reflected ultrasonic wave and converts it into a local electric charge and a signal. The fourth conductive layer 32 is disposed on a surface of the second piezoelectric layer 34 opposite to the cover plate 10. The fourth conductive layer 32 is electrically connected to the ultrasonic sensing device detection circuit 200 and is configured to output an electrical signal as a sensing signal to the ultrasonic sensing device detection circuit 200. The fourth conductive layer 32 serves as a bias electrode layer for receiving a ground voltage or a bias voltage. In this embodiment, the fourth conductive layer 32 is grounded. In this embodiment, the third conductive layer 31 and the fourth conductive layer 32 are made of a metal material, such as silver (Ag), copper (Cu), molybdenum (Mo), etc., but not This is the limit. The first piezoelectric layer 24 is made of polyvinylidenefluoride (PVDF) material.

It can be understood that the stacked position relationship of the ultrasonic transmitting module 20 and the ultrasonic receiving module 30 is interchangeable.

Please refer to FIG. 2 together. The ultrasonic sensing device detection circuit 200 is electrically connected to the ultrasonic transmitting module 20 and the ultrasonic receiving module 30. The ultrasonic sensing device detection circuit 200 can compare the amplitude and phase of the sensing signal output by the ultrasonic sensing device 100 and the input driving signal, analyze the properties of the object under test to further determine whether a function of false touch occurs. The false touch here refers to a situation in which the ultrasonic sensing device 100 is triggered to perform a corresponding function due to a touch of a non-recognized operating object. The ultrasonic sensing device detection circuit 200 is configured to drive the ultrasonic transmitting module 20 to generate a driving signal of an ultrasonic wave, and receive a sensing signal output from the ultrasonic receiving module 30. According to the driving signal and the sensing signal, The amplitude and phase of the signal determine whether the touch operation is valid, and output a touch sensing signal to control the controlled component 500 to perform a corresponding operation when the touch operation is valid.

The ultrasonic sensing device detection circuit 200 includes a driving module 210, a phase detection module 230, an amplitude detection module 250, and a signal processing module 270.

The driving module 210 is electrically connected to the ultrasonic transmitting module 20 and the phase detecting module 230. The driving module 210 is configured to output a driving signal to the first conductive layer 21 and the phase detection module 230. In this embodiment, the driving signal may be a sine wave, a triangle wave, a square wave, or the like, but is not limited thereto.

The phase detection module 230 is electrically connected to the driving module 210 and the ultrasonic receiving module 30. The phase detection module 230 is configured to receive a driving signal output from the driving module 210 and a sensing signal output from the ultrasonic receiving module 30, and output a sensing phase difference value after processing the signals. Wherein, the sensing phase difference value is a phase difference value between the sensing signal and the driving signal. The phase detection module 230 may further detect a phase change behavior of the driving signal and the sensing signal.

Referring to FIG. 3 together, the phase detection module 230 includes a first voltage source VDD1, a second voltage source VDD2, a first flip-flop 231, a second flip-flop 232, and a logic comparator 235. The first flip-flop 231 includes a first control terminal D1, a first input terminal IN1, a first reset terminal Reset1, and a first output terminal Q1. The first control terminal D1 is electrically connected to the first voltage source VDD1, the first input terminal IN1 is electrically connected to the driving module 210, and the first output terminal Q1 is connected to the signal processing module. The group 270 is electrically connected, and the first reset terminal Reset1 is electrically connected to the output terminal of the logic comparator 235. The second flip-flop 232 includes a second control terminal D2, a second input terminal IN2, a second reset terminal Reset2, and a second output terminal Q2. The second control terminal D2 is electrically connected to the second voltage source VDD2, the second input terminal IN2 is electrically connected to the fourth conductive layer 32 of the ultrasonic receiving module 30, and the second output terminal Q2 is electrically connected to the signal processing module 270, and the second reset terminal Reset2 is electrically connected to the output terminal of the logic comparator 235. A first input terminal of the logic comparator 235 is electrically connected to the first output terminal Q1, and a second input terminal of the logic comparator 235 is electrically connected to the second output terminal Q2. In this embodiment, the logic comparator 235 is an AND gate. In other embodiments, the control input terminal of the second flip-flop 232 may be electrically connected to the first voltage source VDD1, and the second voltage source VDD2 is further omitted.

Please refer to FIG. 4, when a touch operation is applied to the ultrasonic sensing device 100, a first input terminal IN1 of the first trigger 231 receives a driving signal output by the driving module 210. A second input terminal IN2 of the two triggers 232 receives a sensing signal output by the ultrasonic receiving module 30. When the phase of the driving signal is ahead of the phase of the sensing signal, the first output terminal Q1 outputs a sensing phase difference value.

Please refer to FIG. 5, when a touch operation is applied to the ultrasonic sensing device 100, a first input terminal IN1 of the first trigger 231 receives a driving signal output by the driving module 210. A second input terminal IN2 of the two triggers 232 receives a sensing signal output by the ultrasonic receiving module 30. When the phase of the driving signal is behind the phase of the sensing signal, the second output terminal Q2 outputs a sensing phase difference value.

The amplitude detection module 250 is electrically connected to the fourth conductive layer 32 of the ultrasonic receiving module 30. The amplitude detection module 250 is configured to detect the amplitude of the sensing signal and output it to the signal processing module 270.

The signal processing module 270 is electrically connected to the phase detection module 230 and the amplitude detection module 250. The signal processing module 270 is configured to receive the amplitude of the sensing signal and the sensing phase difference value, detect the amplitude of the sensing signal and the driving signal, and detect the amplitude of the sensing signal within the predetermined time. Whether the corresponding output terminal of the phase detection module 230 continuously outputs the sensed phase difference value, and detects whether the previous phase difference value, whether the sensed phase difference value and a predetermined phase difference value are within a predetermined range, and determine whether Describes whether the touch operation is effective.

If the amplitude of the sensing signal is equal to the amplitude of the driving signal, the signal processing module 270 recognizes that the touch is invalid. If the amplitude of the sensing signal is not equal to the amplitude of the driving signal, the signal processing module 270 identifies the output terminal of the sensing phase difference value and further detects whether the corresponding output terminal continues for a predetermined time. And outputting the sensed phase difference value.

If the corresponding output terminal of the phase detection module 230 intermittently outputs the sensed phase difference value within the predetermined time, the signal processing module 270 recognizes that the touch is invalid.

If the corresponding phase of the phase detection module 230 continuously outputs the sensed phase signal within the predetermined time, the signal processing module 270 further compares the sensed phase difference value with the predetermined phase difference value. Whether the absolute value of the difference is within a predetermined range.

If the absolute value of the difference between the phase of the sensed phase difference value and the predetermined phase difference value exceeds a predetermined range, the signal processing module 270 recognizes that the touch is invalid; if the phase of the sensed phase difference value is If the absolute value of the difference between the predetermined phase difference and the predetermined phase difference is within a predetermined range, the signal processing module 270 recognizes that the touch is valid, and outputs a touch sensing signal to the controlled element 500. In this embodiment, when the object to be measured is water, the phase and amplitude of the sensing signal output by the ultrasonic receiving module 30 are changed, but the phase of the sensing signal is not stable within a predetermined time, and sometimes the driving signal is advanced. Phase, sometimes behind the phase of the driving signal; when the object to be measured is oil, the phase and amplitude of the sensing signal output by the ultrasonic receiving module 30 changes, but the phase of the sensing signal varies within a larger range and exceeds a predetermined phase 70% of the difference; when the object to be measured is metal, the phase and amplitude of the sensing signal output by the ultrasonic receiving module 30 have not changed.

Wherein, the predetermined phase difference value is a phase difference value φ of the driving signal and the sensing signal when there is no touch operation. The predetermined range is 0-0.7φ.

The controlled component 500 is electrically connected to the signal processing module 270. The controlled component 500 performs a corresponding operation according to the touch sensing signal. For example, the controlled element 500 may be an LED in a display screen of the ultrasonic sensing device 100, and the corresponding operation may be to turn on or off the LED. In other embodiments, the controlled element 500 may also be a switching element, and the corresponding operation may be the on and off of the switch, without being limited thereto.

Table 1 shows the amplitude change, phase change mode, and phase change range of the sensing signals applied to the ultrasonic sensing device 100 by different objects to be measured.

Among them, φ is the phase difference between the driving signal and the sensing signal when there is no touch operation.

Please refer to FIG. 6, which is a schematic cross-sectional view of an ultrasonic sensing device 300 according to a second embodiment of the present invention. The ultrasonic sensing device 300 is a multi-point ultrasonic sensing device. The difference between the ultrasonic sensing device 300 and the ultrasonic sensing device 300 lies in the substrate 110 and the ultrasonic receiving module 45.

The ultrasonic receiving module 45 is adhered to the surface of the ultrasonic transmitting module 20 opposite to the cover plate 10 through the second adhesive layer 14.

The ultrasonic receiving module 45 is used for receiving reflected ultrasonic waves and correspondingly converting them into local electric charges, and coupling the local electric charges into electric signals and outputting the electric signals to the ultrasonic sensing device detection circuit 200. The electrical signal can be transmitted to the ultrasonic sensing device detection circuit 200 through a flexible circuit board or other conductive traces. The ultrasonic receiving module 45 includes a third conductive layer 451 and a second piezoelectric layer 454. The second piezoelectric layer 454 receives the reflected ultrasonic energy and converts it into a local electric charge. The third conductive layer 451 serves as a bias electrode layer for receiving a ground voltage or a bias voltage. In this embodiment, the third conductive layer 451 is grounded. Preferably, the third conductive layer 451 may be electrically connected to the second conductive layer 22 through a conductive adhesive and then grounded through a flexible circuit board or other conductive traces. The third conductive layer 451 is adhered to the surface of the second conductive layer 22 opposite to the cover plate 10 through the second adhesive layer 14. In this embodiment, the third conductive layer 451 is made of a metal material, such as silver (Ag), copper (Cu), molybdenum (Mo), etc., but is not limited thereto. The second piezoelectric layer 454 is made of PolyvinylideneFluoride (PVDF) material.

It can be understood that the stacked position relationship of the ultrasonic transmitting module 20 and the ultrasonic receiving module 30 is interchangeable.

The substrate 110 is disposed on a surface of the second piezoelectric layer 454 opposite to the cover plate 10. The substrate 110 is a thin film transistor substrate, and a thin film transistor (TFT) array is disposed thereon. The TFT on the substrate 110 is coupled to the second piezoelectric layer 454 to convert the electric charge generated on the second piezoelectric layer 454 into an electric signal, and the electric signal is used as a sensing signal and output to the ultrasonic wave transmission. Sense device detection circuit 200. The substrate 110 is made of transparent glass or plastic material. In this embodiment, the substrate 110 may be a glass substrate or other transparent substrates with high strength and high hardness, such as polycarbonate (PC), polyester (Polythylene terephthalate, PET), and polymethacrylic acid. Polymethylmethacrylate (PMMA), Cyclic Olefin Copolymer (COC) or Polyether sulfone (PES) and other materials. In other embodiments, the substrate 110 may be a flexible substrate.

Please refer to FIG. 7, which is a touch sensing detection method. It is applied to the ultrasonic sensing device 100 of the first embodiment or the ultrasonic sensing device 300 of the second embodiment. The touch sensing detection method includes the following steps:

In step S71, a driving signal for driving the ultrasonic transmitting module 20 is received and an ultrasonic wave reflected by the ultrasonic receiving module 30 according to the object to be measured is generated and a sensing signal is generated accordingly.

In step S72, the amplitude detection module 250 detects whether the amplitudes of the driving signal and the sensing signal are equal. If the amplitude of the sensing signal is equal to the amplitude of the driving signal, the touch is identified as invalid and the process ends; if the amplitude of the sensing signal is not equal to the amplitude of the driving signal, step S73 is performed.

In step S73, the phase detection module 230 generates a sensing phase difference value according to a phase change of the driving signal and the sensing signal. The phase detection module 230 includes a first output terminal Q1 and a second output terminal Q2. The output of the sensing phase difference value from the first output terminal Q1 or the second output terminal Q2 respectively indicates whether the phase of the sensing signal and the driving signal are backward or advanced. Wherein, when the first output terminal Q1 of the phase detection module 230 outputs the sensed phase difference value, the phase of the sensing signal is behind the phase of the driving signal, and the second of the phase detection module 230 When the output phase Q2 outputs the sensing phase difference value, the phase of the sensing signal is ahead of the phase of the driving signal.

In step S74, the signal processing module 270 identifies an output terminal in the phase detection module 230 for outputting the sensed phase difference value.

In step S75, the signal processing module 270 detects whether the corresponding output terminal of the phase detection module 230 continuously outputs the sensed phase difference value within a predetermined time. If the corresponding output terminal of the phase detection module 230 intermittently outputs the sensed phase difference value, the recognition touch is invalid and the process ends; if the corresponding output terminal of the phase detection module 230 continuously outputs the sensed phase difference Value, step S76 is performed.

In step S76, the signal processing module 270 detects whether the absolute value of the difference between the phase of the sensed phase difference and the predetermined phase difference is within a predetermined range. If the absolute value of the difference between the phase of the sensed phase difference and the predetermined phase difference exceeds a predetermined range, the touch is recognized as invalid, and the process ends; if the phase of the sensed phase difference and the predetermined phase difference If the absolute value of the difference is within a predetermined range, step S77 is performed. Wherein, the predetermined phase difference value is a phase difference value φ of the driving signal and the sensing signal when there is no touch operation. The predetermined range is 0-0.7φ.

In this embodiment, when the object to be measured is water, the phase and amplitude of the sensing signal output by the ultrasonic receiving module 30 are changed, but the phase of the sensing signal is not stable within a predetermined time, and sometimes the driving signal is advanced. Phase, sometimes behind the phase of the driving signal; when the object to be measured is oil, the phase and amplitude of the sensing signal output by the ultrasonic receiving module 30 changes, but the phase of the sensing signal varies within a larger range and exceeds a predetermined phase 70% of the difference; when the object to be measured is metal, the phase and amplitude of the sensing signal output by the ultrasonic receiving module 30 have not changed.

In step S77, the signal processing module 270 outputs a touch sensing signal to control the controlled component 500 to perform a corresponding operation. In this embodiment, the controlled element 500 may be an LED in a display screen of the ultrasonic sensing device 100, and the corresponding operation may be to turn on or off the LED. In other embodiments, the controlled element 500 may also be a switching element, and the corresponding operation may be turning on and off the switch.

The above-mentioned ultrasonic sensing device detection circuit 200 simultaneously detects changes in the phase and amplitude of the sensing signal, and recognizes whether the touch operation is effective based on the detected phase and amplitude, and detects the phase and the sensing signal of the driving signal within a predetermined time The change between the phases further improves the touch accuracy of the ultrasonic sensing device, and reduces the influence of water droplets, grease and other substances on the touch operation.

In summary, the present invention complies with the elements of an invention patent, and a patent application is filed in accordance with the law. However, the above is only a preferred embodiment of the present invention. For those who are familiar with the skills of this case, equivalent modifications or changes made according to the spirit of this case should be included in the scope of patent application below.

100, 300‧‧‧ Ultrasonic sensing device

10‧‧‧ Cover

20‧‧‧Ultrasonic Transmitter Module

21‧‧‧first conductive layer

22‧‧‧Second conductive layer

24‧‧‧first piezoelectric layer

12‧‧‧ first adhesive layer

30, 45‧‧‧ Ultrasonic receiving module

31,451‧‧‧The third conductive layer

32‧‧‧ fourth conductive layer

34,454‧‧‧Second piezoelectric layer

14‧‧‧Second adhesive layer

200‧‧‧ Ultrasonic sensor device detection circuit

210‧‧‧Drive Module

230‧‧‧phase detection module

231‧‧‧First trigger

D1‧‧‧The first control terminal

IN1‧‧‧first input

Reset1‧‧‧First reset terminal

Q1‧‧‧first output

232‧‧‧Second trigger

D2‧‧‧Second Control Terminal

IN2‧‧‧Second Input

Reset2‧‧‧Second reset terminal

Q2‧‧‧Second output

250‧‧‧Amplitude detection module

270‧‧‧Signal Processing Module

500‧‧‧Controlled element

FIG. 1 is a schematic cross-sectional view of an ultrasonic sensing device according to a first embodiment.

FIG. 2 is a schematic diagram of a module of the touch detection circuit shown in FIG. 1.

FIG. 3 is an equivalent circuit diagram of the phase detection module shown in FIG. 2.

FIG. 4 is a waveform diagram of a driving signal, a sensing signal, a first output signal, and a second output signal of the first embodiment in FIG. 3.

FIG. 5 is a waveform diagram of the driving signal, the sensing signal, the first output signal and the second output signal of the second embodiment in FIG. 3.

FIG. 6 is a schematic cross-sectional view of an ultrasonic sensing device according to a second embodiment.

FIG. 7 is a flowchart of an ultrasonic sensing detection method.

no

no

Claims (15)

An ultrasonic sensing device includes an ultrasonic transmitting module, an ultrasonic receiving module, a touch detection circuit, and a controlled component; the ultrasonic transmitting module is used to generate ultrasonic waves; and the ultrasonic receiving module is used to receive an object to be measured The ultrasonic wave reflected back and correspondingly generates a sensing signal; the touch detection circuit is electrically connected to the ultrasonic transmitting module and the ultrasonic receiving module at the same time; wherein the touch detection circuit drives the ultrasonic emission The module generates an ultrasonic wave, receives a sensing signal output from the ultrasonic receiving module, recognizes whether the current touch operation is valid according to the phase change and amplitude change of the sensing signal and the driving signal, and outputs a touch when the touch operation is valid. The signal is sensed to control the controlled element to perform a corresponding operation. The ultrasonic sensing device according to claim 1, wherein the touch detection circuit detects a phase difference between the sensing signal and the driving signal to generate a sensing phase difference; when the sensing signal is When the amplitude is the same as that of the driving signal, the touch object is considered to be an unapproved object and the touch is invalid; when the amplitude of the sensing signal is different from the amplitude of the driving signal, the detection is continued for a predetermined time When the sensed phase difference value and the absolute value of the difference between the sensed phase difference value and the predetermined phase difference value are within a predetermined range, the touched object is regarded as an approved test object and the touch is valid. The ultrasonic sensing device according to claim 1, wherein the touch detection circuit includes an amplitude detection module, a driving module, a phase detection module, and a signal processing module; the amplitude detection module and the ultrasonic wave The receiving module is electrically connected to the signal detection module; the amplitude detection module is used to detect the amplitude of the sensing signal and output to the signal processing module; the driving module and the ultrasonic emission The module and the phase detection module are electrically connected to output a driving signal to the ultrasonic transmitting module and the phase detection module; the phase detection module and the driving module and the ultrasonic reception The module is electrically connected to detect a phase change of the driving signal and the sensing signal to generate a sensing phase difference value; the signal processing module is based on the amplitude of the sensing signal and the driving signal, The sensing phase difference value determines whether the current touch operation is valid. The ultrasonic sensing device according to claim 2, wherein the phase detection module includes a first trigger, a second trigger, and a logic comparison module; the logic comparator includes a first input terminal and a second input Terminal and output terminal, the first trigger includes a first input terminal, a first reset terminal, and a first output terminal; the second trigger includes a second input terminal, a second reset terminal, and a second output terminal The first input terminal is electrically connected to the driving module, the first output terminal is electrically connected to the signal processing module, the first reset terminal is connected to the output terminal of the logic comparator Electrical connection; the second input terminal is electrically connected to the ultrasonic receiving module, the second output terminal is electrically connected to the signal processing module, and the second reset terminal is compared with the logic An output terminal of the comparator is electrically connected; a first input terminal of the logic comparator is electrically connected to the first output terminal, and a second input terminal of the logic comparator is electrically connected to the second output terminal. The ultrasonic sensing device according to claim 3, wherein the phase detection module includes a first output end and a second output end; if the amplitude of the sensing signal is not equal to the amplitude of the driving signal, The signal processing module identifies the output terminal that senses the phase difference value and detects whether the corresponding output terminal that continuously outputs the sensed phase difference value within a predetermined time; if the phase detection module corresponds to The output terminal continuously outputs the sensed phase difference value, and the signal processing module further compares whether an absolute value of a difference between the sensed phase difference value and a predetermined phase difference value is within a predetermined range; if the sensed phase difference value is within a predetermined range; The absolute value of the difference between the measured phase difference value and the predetermined phase difference value is within a predetermined range, then the signal processing module recognizes that the touch is valid, and outputs a touch sensing signal to control the controlled element to execute the corresponding operating. The ultrasonic sensing device according to claim 5, wherein the predetermined phase difference value is a phase difference value φ of the driving signal and the sensing signal when there is no touch operation; the predetermined range is 0-0.7 φ. An ultrasonic sensing detection circuit, wherein the ultrasonic sensing detection circuit is electrically connected to an ultrasonic transmitting module, an ultrasonic receiving module, and a controlled component; wherein the ultrasonic sensing detecting circuit drives the ultrasonic transmitting module to generate ultrasonic waves And receives a sensing signal output by the ultrasonic receiving module; the touch detection circuit includes a driving module, a phase detection module, an amplitude detection module, and a signal processing module; the driving module and the The ultrasonic transmitting module and the phase detecting module are electrically connected to output driving signals to the ultrasonic transmitting module and the phase detecting module; the phase detecting module and the driving module and the phase detecting module The ultrasonic receiving module is electrically connected to generate a sensing phase difference value according to a phase difference between the driving signal and the sensing signal; the amplitude detecting module is electrically connected to the signal processing module, And used to detect the amplitude of the sensing signal and output it to the signal processing module; the signal processing module is based on the amplitude of the sensing signal and the sensing phase Determining whether the value of the current touch operation is valid, and outputs the touch sensing signal when the touch operation is effective to control the controlled member perform a corresponding operation. The ultrasonic sensing and detecting circuit according to claim 7, wherein when the amplitude of the sensing signal is the same as the amplitude of the driving signal, the touch object is considered to be a non-approved test object and the touch is invalid; The amplitude of the sensing signal is different from the amplitude of the driving signal, the sensing phase difference value is continuously detected for a predetermined time, and the absolute value of the difference between the sensing phase difference value and the predetermined phase difference value is When the value is within a predetermined range, the touched object is considered to be the tested object and the touch is valid. The ultrasonic sensing detection circuit according to claim 8, wherein the phase detection module includes a first output terminal and a second output terminal; if the amplitude of the sensing signal is not equal to the amplitude of the driving signal, The signal processing module identifies the output terminal that senses the phase difference value and detects whether the output terminal corresponding to the predetermined period of time continuously outputs the sensed phase difference value; if the phase detection module corresponds to the predetermined time The output terminal continuously outputs the sensed phase difference value, and the signal processing module further compares whether an absolute value of a difference between the sensed phase difference value and a predetermined phase difference value is within a predetermined range; if the The absolute value of the difference between the sensed phase difference value and the predetermined phase difference value is within a predetermined range, the signal processing module recognizes that the touch is valid, and outputs a touch sensing signal to control the controlled element to execute the corresponding Operation. The ultrasonic sensing and detection circuit according to claim 9, wherein the predetermined phase difference value is a phase difference value φ of the driving signal and the sensing signal when there is no touch operation; the predetermined range is 0- 0.7φ. The ultrasonic sensing detection circuit according to claim 8, wherein the phase detection module includes a first trigger, a second trigger, and a logic comparison module; the first trigger includes a first input terminal, a first A reset terminal and a first output terminal; the second trigger includes a second input terminal, a second reset terminal, and a second output terminal; the first input terminal is electrically connected to the driving module, so The first output terminal is electrically connected to the signal processing module, the first reset terminal is electrically connected to the output terminal of the logic comparator, and the second input terminal is electrically connected to the ultrasonic receiving module. The second output terminal is electrically connected to the signal processing module, and the second reset terminal is electrically connected to the output terminal of the logic comparator; the first input terminal of the logic comparator It is electrically connected to the first output terminal, and the second input terminal of the logic comparator is electrically connected to the second output terminal. An ultrasonic sensing device detection method is used in an ultrasonic sensing device. The ultrasonic sensing device includes an ultrasonic transmitting module to receive a driving signal to generate an ultrasonic wave, and the ultrasonic receiving module receives an ultrasonic wave reflected from a test object and generates the corresponding ultrasonic wave. A sensing signal, an ultrasonic sensing detection circuit, and a controlled component; the ultrasonic sensing detection circuit includes a phase detection module and an amplitude detection module; the ultrasonic sensing detection method includes the following steps: The driving signal sent by the group and the sensing signal output by the ultrasonic receiving module; detecting the phase change and amplitude change of the driving signal and the sensing signal to determine whether the current touch operation is valid; if the touch operation is valid , Output a touch sensing signal to control the controlled component to perform a corresponding operation. The ultrasonic sensing device detection method according to claim 12, wherein the ultrasonic sensing device detection further comprises: detecting whether an amplitude of the driving signal and an amplitude of the sensing signal are equal; if the sensing signal The amplitude is not equal to the amplitude of the driving signal, and a sensing phase difference value is output according to a phase change of the driving signal and the sensing signal; identifying the phase detecting module for outputting the sensing phase difference Value output terminal; whether the corresponding output terminal of the sensing phase detection module continuously outputs the sensing phase difference value within a predetermined time; if the corresponding output terminal of the sensing phase detection module continues within a predetermined time Output the sensed phase difference value, and an absolute value of a difference between the sensed phase difference value and a predetermined phase difference value output by the phase detection module is within a predetermined range, and output a touch sensing signal to control the The controlled element performs the corresponding operation. The method for detecting an ultrasonic sensing device according to claim 13, wherein the predetermined phase difference value is a phase difference value between the driving signal and the sensing signal when there is no touch operation. The method for detecting an ultrasonic sensing device according to claim 13, wherein the predetermined range is 0-0.7φ, where φ is a phase difference between the driving signal and the sensing signal when there is no touch operation.