Haptic driving circuit, haptic driving device and haptic driving method

Abstract

A haptic driving circuit, a haptic driving device and a haptic driving method, relating to the technical field of haptic feedback. The haptic driving circuit is applied to a haptic feedback substrate. The haptic feedback substrate comprises a touch substrate and an actuator connected to the touch substrate, and the actuator is provided with a first capacitor. The haptic driving circuit comprises: an amplification circuit connected to a driving signal end and used for amplifying a driving signal input from the driving signal end; and a matching circuit, wherein an input end of the matching circuit is connected to an output end of the amplification circuit, the input end of the matching circuit is further used for being connected to a first electrode of the first capacitor, an output end of the matching circuit is used for being connected to a second electrode of the first capacitor, the matching circuit at least comprises one inductor, the inductor is used for forming an LC oscillation circuit with the first capacitor, the LC oscillation circuit can generate an oscillation signal under the excitation of an output signal of the amplification circuit, and the oscillation signal is used for driving the actuator to vibrate.

Description

Haptic drive circuit, haptic drive device and haptic drive method TECHNICAL FIELD

[0001] The present disclosure relates to the field of haptic feedback, and in particular to a haptic drive circuit, a haptic drive device and a haptic drive method. BACKGROUND

[0002] Haptic feedback is a cutting-edge technology in the field of virtual reality and human-computer interaction. Multimedia terminals such as smart phones and tablet computers that apply haptic feedback technology have broad application prospects in the fields of education, entertainment and medical treatment.

[0003] SUMMARY

[0004] The present disclosure provides a haptic drive circuit applied to a haptic feedback substrate, the haptic feedback substrate comprising a touch substrate and an actuator connected to the touch substrate, the actuator having a first capacitance, the haptic drive circuit comprising:

[0005] an amplification circuit connected to a drive signal end, for amplifying a drive signal input by the drive signal end; and

[0006] a matching circuit, an input end of the matching circuit being connected to an output end of the amplification circuit, the input end of the matching circuit also being used to connect to a first pole of the first capacitance, an output end of the matching circuit being used to connect to a second pole of the first capacitance, the matching circuit comprising at least one inductor, the inductor being used to form an LC oscillation circuit with the first capacitance, the LC oscillation circuit being capable of generating an oscillation signal under the excitation of an output signal of the amplification circuit, the oscillation signal being used to drive the actuator to vibrate.

[0007] In some embodiments, the matching circuit comprises at least one matching unit, an input end of the matching unit being connected to the output end of the amplification circuit, the matching unit comprising:

[0008] one or more inductors, the inductance values of the plurality of inductors being different from each other; and

[0009] a switch circuit connected to a control signal end, the input end of the matching unit and the first end of the inductor respectively, for turning on the connection between the input end of the matching unit and one of the inductors according to a control signal input by the control signal end, the second end of the inductor being connected to the output end of the matching unit.

[0010] In some embodiments, the matching unit comprises a plurality of inductors, and the inductance values of the plurality of inductors are sorted in ascending order to form an arithmetic sequence.

[0011] In some embodiments, the matching circuit comprises a plurality of the matching units, and the plurality of the matching units are connected in series between the input end of the matching circuit and the output end of the matching circuit, or the plurality of the matching units are connected in parallel between the input end of the matching circuit and the output end of the matching circuit.

[0012] In some embodiments, the switch circuit in at least two matching units is connected to different control signal ends.

[0013] In some embodiments, the matching unit comprises a plurality of the inductors, and the inductance values of the plurality of inductors in the same matching unit are arranged in ascending order to form an arithmetic sequence, and the arithmetic sequences corresponding to the at least two matching units have different tolerances.

[0014] In some embodiments, the arithmetic sequences corresponding to different matching units have different tolerances, and the tolerances of the arithmetic sequences corresponding to the plurality of matching units are arranged in ascending order to form a geometric sequence.

[0015] In some embodiments, the matching unit comprises a plurality of the inductors, and the switch circuit comprises:

[0016] an analog switch, a signal enable end of the analog switch is connected to the control signal end, an input end of the analog switch is connected to the input end of the matching unit, the analog switch comprises a plurality of output ends, the output ends of the analog switch are connected to the first ends of the inductors, and different output ends of the analog switch are connected to the first ends of different inductors.

[0017] In some embodiments, the switch circuit comprises:

[0018] a first transistor, a control pole of the first transistor is connected to the control signal end, a first pole of the first transistor is connected to the input end of the matching unit, and a second pole of the first transistor is connected to the first end of one of the inductors.

[0019] In some embodiments, one of the first transistors and one of the inductors form an inductor branch, and a plurality of the inductor branches are connected in parallel between the input end of the matching unit and the output end of the matching unit.

[0020] In some embodiments, the inductance value of the inductor is greater than or equal to 0 henry and less than or equal to 1 henry.

[0021] In some embodiments, the amplification circuit comprises:

[0022] an operational amplifier, an inverting input end of the operational amplifier is connected to the driving signal end, and a non-inverting input end of the operational amplifier is connected to a ground potential;

[0023] a first resistor connected between the inverting input terminal and the driving signal terminal; and

[0024] a second resistor connected between the inverting input terminal and an output terminal of the amplification circuit.

[0025] In some embodiments, the amplification circuit is configured to inversely amplify the driving signal with an amplification factor greater than or equal to 5 and less than or equal to 50.

[0026] In some embodiments, the driving signal has a frequency greater than or equal to 5 KHz and less than or equal to 50 KHz.

[0027] The present disclosure provides a haptic feedback device, comprising:

[0028] a haptic feedback substrate comprising a touch substrate and an actuator connected to the touch substrate, the actuator having a first capacitance; and

[0029] a haptic driving circuit as described in any of the embodiments.

[0030] In some embodiments, the first capacitance has a capacitance value greater than or equal to 1 nano Farad and less than or equal to 100 micro Farad.

[0031] In some embodiments, the actuator comprises at least one of a PZT piezoelectric film, a monolithic piezoelectric ceramic, a stacked piezoelectric ceramic, a cymbal piezoelectric ceramic, a monolithic polyvinylidene fluoride film, a stacked polyvinylidene fluoride film, a cymbal polyvinylidene fluoride film, and a linear motor.

[0032] The present disclosure provides a haptic driving method applied to a haptic driving circuit as described in any of the embodiments, the haptic driving method comprising:

[0033] obtaining a capacitance value of the first capacitance and a frequency of the driving signal;

[0034] determining a target inductance value according to the capacitance value and the frequency;

[0035] generating a control signal according to the target inductance value, and outputting the control signal from the control signal terminal to the switch circuit, so that the switch circuit turns on the connection between the input terminal of the matching unit and one of the inductors according to the control signal.

[0036] In some embodiments, the matching circuit comprises a plurality of matching units connected in series between the input terminal and the output terminal of the matching circuit, and the step of generating a control signal according to the target inductance value and outputting the control signal from the control signal terminal to the switch circuit comprises:

[0037] According to the target inductance value, a plurality of control signals are generated, and the control signals are output to the switch circuit in different matching units.

[0038] In some embodiments, the step of determining the target inductance value according to the capacitance value and the frequency comprises:

[0039] The target inductance value is calculated according to the following formula:

[0040] L = 1 / (2pf) 2 C, the L is the target inductance value, the C is the capacitance value of the first capacitor, and the f is the frequency of the driving signal.

[0041] The above description is only a summary of the technical solutions of the present disclosure. In order to enable the technical means of the present disclosure to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, features and advantages of the present disclosure to be more apparent and easy to understand, the specific embodiments of the present disclosure are described below.

[0042] Brief Description of the Drawings

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the related art, the drawings needed to be used in the embodiments or related art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor. It should be noted that the proportions in the drawings are only for illustration and do not represent the actual proportions.

[0044] Fig. 1 shows a structure schematic diagram of a first haptic drive circuit provided by the present disclosure;

[0045] Fig. 2 shows a voltage-current curve of a control circuit not including an inductor;

[0046] Fig. 3 shows a voltage-current curve of a haptic drive circuit provided by the present disclosure;

[0047] Fig. 4 shows another voltage-current curve of a haptic drive circuit provided by the present disclosure;

[0048] Fig. 5 shows a structure schematic diagram of a second haptic drive circuit provided by the present disclosure;

[0049] Fig. 6 shows a structure schematic diagram of a third haptic drive circuit provided by the present disclosure;

[0050] Fig. 7 shows a correspondence between the logic value of the control signal and the selection of the inductor in the matching unit;

[0051] Fig. 8 shows a structural schematic diagram of a haptic feedback device provided by the present disclosure;

[0052] Fig. 9 shows a structural schematic diagram of a matching unit.

[0053] DETAILED DESCRIPTION

[0054] To make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present disclosure.

[0055] The haptic feedback substrate includes a touch substrate and an actuator connected to the touch substrate. By applying a driving signal to the actuator, the actuator drives the touch substrate to vibrate, thereby realizing a haptic feedback function on the surface of the touch substrate.

[0056] The haptic feedback is usually realized in two ways. One is that the actuator drives the touch substrate to vibrate at a low frequency to simulate button feedback. The other is that the actuator drives the touch substrate to vibrate at a high frequency to generate a film pressing effect, thereby changing the friction coefficient between the touch object (such as a finger) and the surface of the touch substrate to simulate texture haptic feedback.

[0057] The haptic feedback of low-frequency vibration can be realized by normal or lateral vibration of the touch substrate. In general, when the actuator can generate a large enough amplitude, the actuator only needs to drive the touch substrate to generate corresponding vibration feedback. When the driving capability of the actuator is weak, the structure design is needed to make the touch substrate resonate, thereby generating a large enough amplitude, and then realizing corresponding haptic feedback. The low-frequency vibration can be used to simulate the effect of button vibration, for example.

[0058] The haptic feedback of high-frequency vibration can be used to generate texture haptic feedback, such as the haptic effect of touching silk, carpet, etc. The high-frequency vibration can be used to simulate a sliding bar, a knob, etc., for example.

[0059] The present disclosure provides a haptic driving circuit 82 applied to a haptic feedback substrate 81. As shown in Fig. 8, the haptic feedback substrate 81 includes a touch substrate 811 and an actuator 812 connected to the touch substrate 811. The actuator 812 has a first capacitance C1.

[0060] As shown in Fig. 8, the haptic driving circuit 82 includes an amplification circuit 821 and a matching circuit 822. The amplification circuit 821 is connected to a driving signal end V1 and is configured to amplify the driving signal input by the driving signal end V1.

[0061] As shown in FIG. 1, the input end IN of the matching circuit 822 is connected with the output end output of the amplification circuit 821, and the input end IN of the matching circuit 822 is also used for being connected with the first pole of the first capacitor C1, the output end OP of the matching circuit 822 is used for being connected with the second pole of the first capacitor C1, the matching circuit 822 at least includes an inductor L, the inductor L is used for forming an LC oscillation circuit with the first capacitor C1, the LC oscillation circuit can generate an oscillation signal under the excitation of the amplified signal output by the amplification circuit 821, the oscillation signal is used for driving the actuator 812 to vibrate, and then the actuator 812 drives the touch substrate 811 to vibrate, so that the haptic feedback can be generated on the surface of the touch substrate 811.

[0062] Exemplarily, the driving signal end V1 can input a signal by using an external device such as a signal generator, or can input a signal by using a signal generation circuit. The driving signal input by the driving signal end V1 can be a regular waveform such as a sine signal, a rectangular wave, a triangular wave, or can be an irregular waveform, which is not limited in the present disclosure.

[0063] Exemplarily, the driving signal input by the driving signal end V1 is a low-voltage signal, and the amplification circuit 821 is used for amplifying the input low-voltage signal into a high-voltage signal.

[0064] Exemplarily, the inductance value of the inductor L is greater than or equal to 0 henry and less than or equal to 1 henry. Further, the inductance value can be greater than or equal to 100 micro henry and less than or equal to 100 milli henry.

[0065] Since the inductor L can form an LC oscillation circuit with the first capacitor C1, when the oscillation condition is met, the inductor L will continuously provide energy for the first capacitor C1 in the actuator 812, and part of the driving current of the actuator 812 in operation is provided by the inductor L, and the other part is provided by the amplification circuit 821, so as to greatly reduce the power consumption of the haptic driving circuit 82. The haptic driving circuit 82 provided by the present disclosure can use a low-power amplification circuit 821.

[0066] In order to verify the above effect, the inventors have carried out a comparative test. Referring to FIG. 2, the voltage-current curve of the control circuit 21 not including the inductor L is shown. As shown in FIG. 2, the driving signal Vin input by the driving signal end V1 is a sine wave, the peak-to-peak value of the sine wave is 10V, and the frequency is 10kHz. Since the amplification factor is 20, the output signal Vout of the control circuit should theoretically be a sine wave with a peak-to-peak value of 200V, but as can be seen from FIG. 2, the driving capability of the output signal Vout of the control circuit is insufficient, and the output waveform is completely distorted. At the same time, as can be seen from the current curve of the positive power supply end VDD and the current curve of the negative power supply end VSS shown in FIG. 2, the power supply current is always large.

[0067] A voltage-current curve of the haptic drive circuit 82 provided by the present disclosure is shown in FIG. 3. As shown in FIG. 3, the drive signal Vin input at the drive signal end VI is still a sine wave, and the peak-to-peak value of the sine wave is 10 V, and the frequency is 10 kHz. As can be seen from FIG. 3, the output signal Vout of the haptic drive circuit 82 provided by the present disclosure is a sine signal with a peak-to-peak value of 200 V and a frequency of 10 kHz in the other parts except for the first several energy storage periods and the last several release periods, indicating that the actuator 812 can be driven at this time. As can be seen from the current curve of the positive power supply end VDD and the current curve of the negative power supply end VSS shown in FIG. 3, compared with the case without the inductor L (as shown in FIG. 2), the power supply current of the haptic drive circuit 82 provided by the present disclosure has been greatly reduced, that is, the power has been greatly reduced.

[0068] Another voltage-current curve of the haptic drive circuit 82 provided by the present disclosure is shown in FIG. 4. FIG. 4 is a test result after the frequency of the drive signal Vin input at the drive signal end VI is 20 kHz, and the inductance value of the inductor L is adjusted accordingly. As can be seen from FIG. 4, the output signal Vout is a sine signal with a peak-to-peak value of 200 V in the other parts except for the first several energy storage periods and the last several release periods, and the haptic actuator 812 can still be driven.

[0069] In the energy storage period, the drive signal is used to store energy for the inductor L. The higher the frequency of the drive signal, the greater the capacitance value of the first capacitor C1, the longer the required energy storage time, and the more the required energy storage periods. For example, in the case where the capacitance value of the first capacitor C1 is 50 nF and the frequency of the drive signal is 20 kHz, the energy storage period is 3. In the case where the capacitance value of the first capacitor C1 is 1050 nF and the frequency of the drive signal is 20 kHz, the energy storage period is 3. In the case where the capacitance value of the first capacitor C1 is 100 nF and the frequency of the drive signal is 30 kHz, the energy storage period is 9.

[0070] After several energy storage periods, the voltage across the first capacitor C1 reaches a predetermined value. At this time, the inductor L and the first capacitor C1 meet the oscillation condition, and in the subsequent drive, the inductor L continuously provides energy to the first capacitor C1 to drive the first capacitor C1. The driving current of the actuator 812 when working is mostly provided by the inductor L, and only a small part of the current needs to be provided by the amplification circuit 821, thereby greatly reducing the power consumption of the circuit.

[0071] When the input of the amplification circuit 821 is 0, i.e., the amplification circuit 821 stops working, the voltage across the first capacitor C1 will slowly decrease to 0 after several decay periods, thereby completely stopping working. The decay time is consistent with the energy storage time, and is in direct proportion to the frequency of the driving signal and the capacitance value of the first capacitor C1.

[0072] The haptic driving circuit 82 provided by the present disclosure can be directly connected with the actuator 812, without the need to set an expansion circuit, thereby reducing the MOS tube and heat dissipation device in the expansion circuit, and thus greatly reducing the volume of the overall circuit board and greatly reducing the requirement for heat dissipation.

[0073] Exemplarily, the frequency of the driving signal is the resonance frequency of the touch substrate 811.

[0074] In order to reduce power consumption, exemplarily, the driving signal is a high-frequency signal, the frequency (i.e., the driving frequency) of the driving signal is greater than or equal to 5KHz or 20kHz, and less than or equal to 50KHz.

[0075] It should be noted that the driving signal can also be a low-frequency signal, for example, the frequency of the driving signal is greater than or equal to 50Hz, and less than or equal to 500Hz.

[0076] Exemplarily, the voltage value of the driving signal is greater than or equal to -10V, and less than or equal to 10V; or the voltage value of the driving signal is greater than or equal to 0V, and less than or equal to 20V.

[0077] As shown in FIG. 5, the matching circuit 822 includes at least one matching unit U, and the input end D of the matching unit U is connected with the output end output of the amplification circuit 821. Wherein, the input end D of the matching unit U can be directly connected with the output end output of the amplification circuit 821 (as shown in the matching unit U1 in FIG. 5), or indirectly connected with the output end output of the amplification circuit 821.

[0078] Exemplarily, as shown in FIG. 5, the matching unit U includes one or more inductors L, and the inductance values of the plurality of inductors L are different from each other; and a switch circuit SW. The switch circuit SW is respectively connected with the control signal end CTR, the input end D of the matching unit U, and the first end of the inductor L, and is used for conducting the connection between the input end D of the matching unit U and one inductor L according to the control signal CH input by the control signal end CTR, and the second end of the inductor L is connected with the output end S of the matching unit U.

[0079] In a specific implementation, a matching inductance value (i.e., a target inductance value) can be determined according to the capacitance value of the first capacitor C1 and the frequency of the driving signal, and a control signal CH can be generated at the control signal end CTR according to the target inductance value, so that the switch circuit SW can select one inductor L from the plurality of inductors L in the matching unit U to conduct with the input end D of the matching unit U, thereby matching the capacitive load (i.e., the first capacitor C1) in the actuator 812, and further reducing power consumption.

[0080] For example, the target inductance value can be calculated according to the following formula: L = 1 / (2πf) 2 C, L is the target inductance value, C is the capacitance value of the first capacitor C1, and f is the frequency of the driving signal.

[0081] For example, as shown in FIG. 5, the haptic driving circuit 82 includes a matching unit U, i.e., a matching unit U1. The matching unit U1 includes two inductors L, i.e., an inductor L1 and an inductor L2. The first ends of the inductor L1 and the inductor L2 are connected with the switch circuit SW, and the second ends of the inductor L1 and the inductor L2 are connected with the output end S of the matching unit U1. The switch circuit SW is used to select to enable the inductor L1 or the inductor L2 according to the control signal CH.

[0082] In the case that the capacitance value of the first capacitor C1 is unchanged, the inductor L1 and the inductor L2 correspond to two different driving frequencies f1 and f2 respectively. When the driving frequency is f1, the control signal CH input at the control signal end CTR is 0, and the switch circuit SW selects the inductor L1 to conduct with the input end D of the matching unit U to match the first capacitor C1. When the driving frequency is f2, the control signal CH input at the control signal end CTR is 1, and the switch circuit SW selects the inductor L2 to conduct with the input end D of the matching unit U to match the first capacitor C1.

[0083] For example, in the case that the capacitance value of the first capacitor C1 is 100nF, the matching inductance corresponding to 20kHz is 633uF, and the matching inductance corresponding to 30kHz is 281uF, i.e., f1 = 20kHz, f2 = 30kHz, L1 = 633uF, and L2 = 281uF.

[0084] When the actuator 812 needs to be driven at 20kHz, the control signal CH input at the control signal end CTR is 0, at this time the switch circuit SW conducts the inductor L1 and disconnects L2, and the inductor L1 is matched with the first capacitor C1 of the actuator 812.

[0085] When the actuator 812 needs to be driven at 30 kHz, the control signal CH = 1 is inputted to the control signal end CTR, at this time the switch circuit SW turns on the inductor L2 and turns off L1, the inductor L2 is matched with the first capacitor C1 of the actuator 812.

[0086] Exemplarily, as shown in FIG. 6, the haptic drive circuit 82 can include a plurality of matching units U, and the haptic drive circuit 82 shown in FIG. 6 includes four matching units U, and each matching unit U includes 10 inductors in parallel with each other. The four matching units U are matching unit U2, matching unit U3, matching unit U4 and matching unit U5 respectively.

[0087] Exemplarily, the inductance values of the plurality of inductors L in the matching unit U are sorted in ascending order to form an arithmetic sequence. The common difference of the arithmetic sequence is greater than or equal to 1 micro henry, and less than or equal to 1 henry or 100 mH.

[0088] Exemplarily, as shown in FIG. 6, the inductance values of the 10 inductors L1-L10 in the matching unit U2 are sorted in ascending order: 0 mH, 10 mH, 20 mH, 30 mH, 40 mH, 50 mH, 60 mH, 70 mH, 80 mH, 90 mH, to form an arithmetic sequence 1 with a common difference of 10 mH.

[0089] Exemplarily, as shown in FIG. 6, the inductance values of the 10 inductors L11-L20 in the matching unit U3 are sorted in ascending order: 0 mH, 1 mH, 2 mH, 3 mH, 4 mH, 5 mH, 6 mH, 7 mH, 8 mH, 9 mH, to form an arithmetic sequence 2 with a common difference of 1 mH.

[0090] Exemplarily, as shown in FIG. 6, the inductance values of the 10 inductors L21-L30 in the matching unit U4 are sorted in ascending order: 0 mH, 100 mH, 200 mH, 300 mH, 400 mH, 500 mH, 600 mH, 700 mH, 800 mH, 900 mH, to form an arithmetic sequence 3 with a common difference of 100 mH.

[0091] Exemplarily, as shown in FIG. 6, the inductance values of the 10 inductors L31-L40 in the matching unit U5 are sorted in ascending order: 0 mH, 10 mH, 20 mH, 30 mH, 40 mH, 50 mH, 60 mH, 70 mH, 80 mH, 90 mH, to form an arithmetic sequence 4 with a common difference of 10 mH.

[0092] Exemplarily, as shown in FIG. 6, the matching circuit 822 includes a plurality of matching units U, and the plurality of matching units U are connected in series between the input end IN of the matching circuit 822 and the output end OP of the matching circuit 822.

[0093] As shown in FIG. 6, the matching circuit 822 includes four matching units U, i.e., a matching unit U2, a matching unit U3, a matching unit U4 and a matching unit U5, which are connected in series between the input end IN and the output end OP of the matching circuit 822. The input end D of the matching unit U2 is connected to the input end IN of the matching circuit 822, the output end S of the matching unit U2 is connected to the input end D of the matching unit U3, the output end S of the matching unit U3 is connected to the input end D of the matching unit U4, the output end S of the matching unit U4 is connected to the input end D of the matching unit U5, and the output end S of the matching unit U5 is connected to the output end OP of the matching circuit 822.

[0094] As shown in FIG. 6, the input end D of the matching unit U2 is directly connected to the output end output of the amplifying circuit 821, and the input end D of the matching unit U3, the input end D of the matching unit U4 and the input end D of the matching unit U5 are indirectly connected to the output end output of the amplifying circuit 821.

[0095] In a specific implementation, a plurality of matching units U can also be connected in parallel between the input end IN of the matching circuit 822 and the output end OP of the matching circuit 822, and the plurality of matching units U can be connected in parallel and series mixed manner between the input end IN of the matching circuit 822 and the output end OP of the matching circuit 822.

[0096] As shown in FIG. 6, the switch circuit SW in at least two matching units U is connected to different control signal ends CTR. Further, the switch circuit SW in different matching units U is connected to different control signal ends CTR.

[0097] As shown in FIG. 6, for the matching unit U2, the switch circuit SW therein is connected to a first control signal end CTR1 (not shown in FIG. 6) for outputting first control signals CH1, CH2, CH3 and CH4.

[0098] As shown in FIG. 6, for the matching unit U3, the switch circuit SW therein is connected to a second control signal end CTR2 (not shown in FIG. 6) for outputting second control signals CH11, CH12, CH13 and CH14, for example.

[0099] As shown in FIG. 6, for the matching unit U4, the switch circuit SW therein is connected to a third control signal end CTR3 (not shown in FIG. 6) for outputting third control signals CH21, CH22, CH23 and CH24, for example.

[0100] Exemplarily, as shown in FIG. 6, for the matching unit U5, the switch circuit SW therein is connected with the fourth control signal terminal CTR4 (not shown in FIG. 6) for outputting the fourth control signals CH31, CH32, CH33 and CH34, for example.

[0101] Since different control signal terminals CTR can output different control signals, the switch circuit SW in each matching unit U can be independently controlled through different control signal terminals CTR, further improving the matching degree of the inductor L and the first capacitor C1, and being conducive to reducing power consumption.

[0102] Exemplarily, the inductance values of the plurality of inductors L in the same matching unit U are sorted in ascending order to form an arithmetic sequence, and the public differences of the arithmetic sequences corresponding to at least two matching units U are different.

[0103] Exemplarily, the public differences of the arithmetic sequences corresponding to the matching unit U2, the matching unit U3, the matching unit U4 and the matching unit U5 are 10 mH, 1 mH, 100 μH and 10 μH respectively, and the public differences of the arithmetic sequences corresponding to the four matching units U are different.

[0104] Exemplarily, the public differences of the arithmetic sequences corresponding to different matching units U are different, and the public differences of the arithmetic sequences corresponding to the plurality of matching units U are sorted in ascending order to form a geometric sequence. The common ratio of the geometric sequence is greater than or equal to 2 and less than or equal to 20, for example.

[0105] Exemplarily, the public differences of the arithmetic sequences corresponding to the matching unit U2, the matching unit U3, the matching unit U4 and the matching unit U5 are sorted in ascending order to form the following geometric sequence: 10 μH, 100 μH, 1 mH, 10 mH, and the common ratio of the geometric sequence is 10.

[0106] Exemplarily, as shown in FIG. 5 or FIG. 6, the matching unit U includes a plurality of inductors L, and the switch circuit SW includes an analog switch 51. The signal enable terminals (A0 shown in FIG. 5 and A0-A3 shown in FIG. 6) of the analog switch 51 are connected with the control signal terminals CTR (shown in FIG. 5, not shown in FIG. 6), the input terminal of the analog switch 51 is connected with the input terminal D of the matching unit U, the analog switch 51 includes a plurality of output terminals, and the output terminals of the analog switch 51 are connected with the first terminals of the inductors L, and different output terminals of the analog switch are connected with the first terminals of different inductors L.

[0107] As shown in FIG. 5, the analog switch 51 includes two output terminals, which are output terminal SA and output terminal SB. The output terminal SA is connected with the first terminal of the inductor L1, and the output terminal SB is connected with the first terminal of the inductor L2.

[0108] For example, as shown in FIG. 6, the analog switch 51 includes 10 output terminals, i.e., output terminals S1-S10, which are connected to the first ends of the 10 inductors L in the same matching unit U one by one.

[0109] As shown in FIG. 7, a shows the correspondence between the logic values of the first control signals CH1, CH2, CH3 and CH4 and the gated inductors L in the matching unit U2, b shows the correspondence between the logic values of the second control signals CH11, CH12, CH13 and CH14 and the gated inductors L in the matching unit U3, c shows the correspondence between the logic values of the third control signals CH21, CH22, CH23 and CH24 and the gated inductors L in the matching unit U4, and d shows the correspondence between the logic values of the fourth control signals CH31, CH32, CH33 and CH34 and the gated inductors L in the matching unit U5.

[0110] For example, as shown in FIG. 6, the total inductance value of the matching circuit 822 is the sum of the inductance values of the inductors L gated by the matching unit U2, the inductors L gated by the matching unit U3, the inductors L gated by the matching unit U4 and the inductors L gated by the matching unit U5.

[0111] For example, the inductor L gated by the matching unit U2 is L1, the inductor L gated by the matching unit U3 is L13, the inductor L gated by the matching unit U4 is L27, and the inductor L gated by the matching unit U5 is L35. Therefore, the total inductance value of the matching circuit 822 is:

[0112] L=L1+L13+L27+L35=0mH+2mH+600uH+40uH=2.64mH.

[0113] In a specific implementation, the target inductance value can be calculated according to the capacitance value of the first capacitor C1 and the frequency of the driving signal, and then the plurality of control signals CH can be generated according to the target inductance value, and the plurality of control signals CH can be output from the control signal terminal CTR to the switch circuits SW in different matching units U, so that each switch circuit SW selects one inductor L to be turned on according to the corresponding control signal CH.

[0114] For example, the plurality of control signals CH include the first control signals CH1-CH4, the second control signals CH11-CH14, the third control signals CH21-CH24 and the fourth control signals CH31-CH34. By adjusting the control signals to select different inductance value combinations, the total inductance value of the matching circuit 822 can be close to the target inductance value.

[0115] Exemplarily, as shown in FIG. 9, the switch circuit SW includes a first transistor T1, a control electrode of the first transistor T1 is connected with the control signal end CTR, a first electrode of the first transistor T1 is connected with the input end D of the matching unit U, and a second electrode of the first transistor T1 is connected with a first end of an inductor L.

[0116] Exemplarily, as shown in FIG. 9, a first transistor T1 and an inductor L form an inductive branch ZL, and a plurality of inductive branches ZL are arranged in parallel between the input end D of the matching unit U and the output end S of the matching unit U.

[0117] Exemplarily, the matching unit U can also include eight inductors L or other number of inductors L which are connected in parallel with each other and have different inductance values, and accordingly, the adjustment precision of the matching unit U with eight inductors L is changed from 1 / 10 (as shown in FIG. 6) to 1 / 8.

[0118] Exemplarily, the matching circuit 822 can include two matching units U, three matching units U, five matching units U or more matching units U which are connected in series. By increasing the number of the matching units U, the total inductance value adjustment precision of the matching circuit 822 can be improved.

[0119] Exemplarily, the amplification circuit 821 is configured to inversely amplify the driving signal, and the amplification multiple is greater than or equal to 5 and less than or equal to 50.

[0120] Exemplarily, as shown in FIG. 1, the amplification circuit 821 includes an operational amplifier AMP, a non-inverting input end of which is connected with the driving signal end V1, and an inverting input end of which is connected with the ground potential; a first resistor R1 connected between the non-inverting input end and the driving signal end V1; and a second resistor R2 connected between the inverting input end and an output end output of the amplification circuit 821.

[0121] wherein the first resistor R1 and the second resistor R2 are feedback resistors, the signal amplification multiple of the amplification circuit 821 is -R2 / R1, the amplification multiple is negative, that is, the amplification is inverse, and the voltage amplification multiple is generally 10-30 times. Taking the input signal as a 0-5V sinusoidal signal as an example, if the amplification multiple is selected as 10 times, then the output signal is a 0- -50V sinusoidal signal.

[0122] As shown in FIG. 1, VDD is a positive power voltage, and VSS is a negative power voltage, and the power voltage is configured to supply power to the operational amplifier AMP.

[0123] Exemplarily, the driving signal is sent out by the driving signal end V1, reaches the inverting input end of the operational amplifier AMP through the first resistor R1, and is reversely amplified by the second resistor R2 and then reaches the output end of the operational amplifier AMP, and the amplified driving signal is output from the output end to the matching circuit 822.

[0124] The present disclosure provides a haptic feedback device, as shown in FIG. 8, comprising: a haptic feedback substrate 81 comprising a touch substrate 811 and an actuator 812 connected to the touch substrate 811, the actuator 812 having a first capacitance C1; and a haptic driving circuit 82 as provided by any of the embodiments.

[0125] As can be understood by those skilled in the art, the haptic feedback device provided by the present disclosure has the advantages of the haptic driving circuit 82 described above. The haptic feedback device provided by the present disclosure can be integrated into products such as in-vehicle displays, notebooks, and displays, etc., to provide users with a rich and realistic haptic experience.

[0126] Exemplarily, the capacitance value of the first capacitance C1 is greater than or equal to 1 nanofarad and less than or equal to 100 microfarad. The capacitance value of the first capacitance C1 is determined by the number of the actuator 812 and the capacitance value of a single actuator 812.

[0127] Exemplarily, the actuator 812 comprises at least one of: a PZT piezoelectric film, a monolithic piezoelectric ceramic, a stacked piezoelectric ceramic, a cymbal piezoelectric ceramic, a monolithic polyvinylidene fluoride film, a stacked polyvinylidene fluoride film, a cymbal polyvinylidene fluoride film, and a linear motor.

[0128] Exemplarily, the touch substrate 811 is a touch display panel, and correspondingly, the driving assembly 12 is further configured to drive the touch display panel to display an interactive image.

[0129] Exemplarily, the touch display panel comprises a touch circuit and a display panel. The touch circuit can be integrated inside the display panel, or can be independently arranged from the display panel. The touch circuit can be a first capacitance C1 type touch circuit or a resistance type touch circuit, etc.

[0130] The present disclosure provides a haptic driving method, applied to the haptic driving circuit 82 as provided by any of the embodiments, and the haptic driving method comprises:

[0131] Step S01: obtaining a capacitance value of the first capacitance C1 and a frequency of the driving signal.

[0132] Step S02: determining a target inductance value according to the capacitance value and the frequency.

[0133] Step S03: generating a control signal CH according to the target inductance value, and outputting the control signal CH from the control signal terminal CTR to the switch circuit SW, so that the switch circuit SW turns on the connection between the input terminal D of the matching unit U and one inductor L according to the control signal CH.

[0134] In some embodiments, as shown in FIG. 6, the matching circuit 822 includes a plurality of matching units U, which are connected in series between the input terminal IN and the output terminal of the matching circuit 822. Accordingly, step S03 can specifically include: generating a plurality of control signals CH according to the target inductance value, and outputting the plurality of control signals CH from the control signal terminal CTR to the switch circuit SW in different matching units U.

[0135] In some embodiments, step S02 can specifically include: calculating the target inductance value according to the following formula: L = 1 / (2pf) 2 C, L is the target inductance value, C is the capacitance value of the first capacitor C1, and f is the frequency of the driving signal.

[0136] The specific execution process of each step of the haptic driving method provided in the present disclosure can refer to the description of the haptic driving circuit, which will not be repeated here.

[0137] In the present disclosure, the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present disclosure and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0138] In the present disclosure, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations.

[0139] In the present specification, "electrically connected" and "coupled" include the case where the constituent elements are connected together through an element having a certain electrical effect. The "element having a certain electrical effect" is not particularly limited as long as it can perform the transmission of electrical signals between the connected constituent elements. Examples of the "element having a certain electrical effect" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, first capacitors, other elements having various functions, and the like.

[0140] In the present disclosure, the meaning of "a plurality of" is two or more, and the meaning of "at least one" is one or more, unless specifically defined otherwise. "At least one of A, B and C" has the same meaning as "at least one of A, B, or C" and includes the following combinations: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B and C. "A and / or B" includes the following three combinations: only A, only B, and a combination of A and B.

[0141] The use of "for" or "configured to" in the present disclosure means open and inclusive language that does not exclude devices suitable for or configured to perform additional tasks or steps.

[0142] As used in the present disclosure, "about", "approximately" or "around" includes the stated value and the mean value within an acceptable range of deviation from the stated value, as determined by one of ordinary skill in the art taking into account the measurement being discussed and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system).

[0143] As used in the present disclosure, "parallel", "perpendicular", "equal", "flush" include the stated condition and conditions similar to the stated condition within an acceptable range of deviation, wherein the acceptable range of deviation is determined by one of ordinary skill in the art taking into account the measurement being discussed and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallel and approximately parallel, wherein the acceptable range of deviation for approximately parallel may be, for example, within 10° or 5°; "perpendicular" includes absolute perpendicular and approximately perpendicular, wherein the acceptable range of deviation for approximately perpendicular may also be, for example, within 10° or 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable range of deviation for approximate equality may be, for example, a difference between the two of less than or equal to 5% of either. "Flush" includes absolute flush and approximately flush, wherein the acceptable range of deviation for approximately flush may be, for example, a distance between the two of less than or equal to 5% of the size of either.

[0144] It should be understood that when a layer or element is referred to as being disposed on one side of another layer or substrate, it can be that the layer or element is directly disposed on the other layer or substrate, or there can be an intermediate layer between the layer or element and the other layer or substrate.

[0145] The present disclosure describes example embodiments with reference to cross-sectional and / or plan view illustrations that are schematic illustrations of idealized embodiments. Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, examples embodiments should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region illustrated as a rectangle will, typically, have rounded or curved features. Thus, the regions illustrated in the figures are schematic and their shapes are not intended to illustrate the precise shape of a region of a device and are not intended to limit the scope of example embodiments.

[0146] It should be noted finally that the above examples are only used to illustrate the technical solutions of the present disclosure, and not to limit them; although the present disclosure has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A haptic drive circuit applied to a haptic feedback substrate, the haptic feedback substrate comprising a touch substrate and an actuator connected to the touch substrate, the actuator having a first capacitance, the haptic drive circuit comprising: an amplification circuit connected to a drive signal terminal, for amplifying a drive signal input from the drive signal terminal; and a matching circuit, an input terminal of the matching circuit being connected to an output terminal of the amplification circuit, the input terminal of the matching circuit also being used to connect to a first pole of the first capacitance, an output terminal of the matching circuit being used to connect to a second pole of the first capacitance, the matching circuit comprising at least one inductor, the inductor being used to form an LC oscillation circuit with the first capacitance, the LC oscillation circuit being capable of generating an oscillation signal under the excitation of an output signal of the amplification circuit, the oscillation signal being used to drive the actuator to vibrate. The matching circuit comprises at least one matching unit, an input terminal of the matching unit being connected to the output terminal of the amplification circuit, the matching unit comprising: one or more inductors, the inductors having different inductance values; and a switch circuit connected to a control signal terminal, the input terminal of the matching unit and first terminals of the inductors, respectively, for turning on the connection between the input terminal of the matching unit and one of the inductors according to a control signal input from the control signal terminal, second terminals of the inductors being connected to an output terminal of the matching unit. The matching unit comprises a plurality of inductors, and the inductors are arranged in an arithmetic sequence according to their inductance values from small to large. The matching circuit comprises a plurality of matching units, the matching units being connected in series between the input terminal of the matching circuit and the output terminal of the matching circuit, or the matching units being connected in parallel between the input terminal of the matching circuit and the output terminal of the matching circuit.

2. The haptic drive circuit of claim 1, wherein, The switch circuits of at least two matching units are connected to different control signal terminals. The matching unit comprises a plurality of inductors, and the inductors in the same matching unit are arranged in an arithmetic sequence according to their inductance values from small to large, and the arithmetic sequences corresponding to at least two matching units have different tolerances. The arithmetic sequences corresponding to different matching units have different tolerances, and the tolerances of the arithmetic sequences corresponding to the matching units are arranged in a geometric sequence according to their values from small to large.

3. The haptic drive circuit of claim 2, wherein, The matching unit comprises a plurality of inductors, and the switch circuit comprises: an analog switch, a signal enable terminal of the analog switch being connected to the control signal terminal, an input terminal of the analog switch being connected to the input terminal of the matching unit, the analog switch comprising a plurality of output terminals, the output terminals of the analog switch being connected to the first terminals of the inductors, and different output terminals of the analog switch being connected to the first terminals of different inductors.

4. The haptic drive circuit of claim 2, wherein, The switch circuit comprises: a first transistor, a control electrode of the first transistor being connected to the control signal terminal, a first pole of the first transistor being connected to the input terminal of the matching unit, and a second pole of the first transistor being connected to the first terminal of one of the inductors.

5. The haptic drive circuit of claim 4, wherein, ​ 6. The haptic drive circuit of claim 4, wherein, ​ 7. The haptic drive circuit of claim 6, wherein, ​ 8. The haptic drive circuit of claim 2, wherein, ​ ​ 9. The haptic drive circuit of claim 2, wherein, ​ ​ 10. The haptic drive circuit of claim 9, wherein, One of the first transistors and one of the inductors form an inductive branch, and a plurality of the inductive branches are arranged in parallel between an input end of the matching unit and an output end of the matching unit.

11. The haptic drive circuit of any one of claims 1 to 10, wherein, An inductance value of the inductor is greater than or equal to 0 henry and less than or equal to 1 henry.

12. The haptic drive circuit of any one of claims 1 to 10, wherein, The amplification circuit comprises: an operational amplifier, an inverting input end of which is connected to the driving signal end, and a non-inverting input end of which is connected to a ground potential; a first resistor, which is connected between the inverting input end and the driving signal end; and a second resistor, which is connected between the inverting input end and an output end of the amplification circuit.

13. The haptic drive circuit of any one of claims 1 to 10, wherein, The amplification circuit is configured to inversely amplify the driving signal, and an amplification factor is greater than or equal to 5 and less than or equal to 50.

14. The haptic drive circuit of any one of claims 1 to 10, wherein, A frequency of the driving signal is greater than or equal to 5 kHz and less than or equal to 50 kHz.

15. A haptic feedback device, comprising: a haptic feedback substrate comprising a touch substrate and an actuator connected to the touch substrate, the actuator having a first capacitance; and a haptic drive circuit as claimed in any one of claims 1 to 14. A capacitance value of the first capacitance is greater than or equal to 1 nanofarad and less than or equal to 100 microfarad.

16. The haptic feedback device of claim 15, wherein, The actuator comprises at least one of a PZT piezoelectric film, a monolithic piezoelectric ceramic, a stacked piezoelectric ceramic, a cymbal piezoelectric ceramic, a monolithic polyvinylidene fluoride film, a stacked polyvinylidene fluoride film, a cymbal polyvinylidene fluoride film, and a linear motor.

17. Haptic feedback device according to claim 15 or 16, wherein, 18. A haptic drive method applied to a haptic drive circuit as claimed in any one of claims 2 to 10, the haptic drive method comprising: obtaining a capacitance value of the first capacitance and a frequency of the driving signal; determining a target inductance value according to the capacitance value and the frequency; generating a control signal according to the target inductance value, and outputting the control signal from the control signal end to the switching circuit, so that the switching circuit turns on a connection between the input end of the matching unit and one of the inductors according to the control signal. The matching circuit comprises a plurality of the matching units, and the plurality of the matching units are sequentially connected in series between an input end and an output end of the matching circuit, and the step of generating a control signal according to the target inductance value and outputting the control signal from the control signal end to the switching circuit comprises:

19. The tactile drive method of claim 18, wherein, generating a plurality of the control signals according to the target inductance value, and outputting the plurality of the control signals from the control signal end to the switching circuits in different matching units. The step of determining a target inductance value according to the capacitance value and the frequency comprises:

20. The tactile drive method according to claim 18 or 19, wherein, calculating the target inductance value according to the following formula: ​ L = 1 / (2πf) 2 C, the L is the target inductance value, the C is the capacitance value of the first capacitor, and the f is the frequency of the driving signal.

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