Driving circuit and tactile feedback system

Abstract

A driving circuit (400) and a tactile feedback system, the driving circuit comprising: a voltage amplification circuit (1 ') electrically connected with a signal input end (IN) and a signal output end (OUT), the voltage amplification circuit being configured to amplify a voltage of the signal input end and then output the amplified voltage to the signal output end; the current amplification circuit (2 ') is electrically connected with an intermediate node (A) and the signal output end, and the current amplification circuit is configured to input compensation current to the signal output end, so that the current of the signal output end is the sum of the current of the input signal end and the compensation current; wherein the current of the intermediate node is the same as that of the signal input end.

Description

A driving circuit and a tactile feedback system Technical Field

[0001] The present disclosure relates to the field of vehicle-mounted technology, and in particular to a drive circuit and a tactile feedback system. Background Art

[0002] In a car's central control screen, vibration feedback is usually used as tactile feedback for the car's central control screen so that users can interact with the car's central control screen.

[0003] For example, large-screen central controls in vehicles usually use mechanically amplified piezoelectric ceramics as vibration actuators for tactile feedback. However, when the mass of the vibration carrier is large, a high-voltage and high-current driving signal is required to achieve the ideal vibration effect.

[0004] Summary of the Invention

[0005] The embodiments of the present disclosure provide a driving circuit and a tactile feedback system to solve the technical problem of insufficient driving capability of the vibration actuator in the large vehicle central control screen in the prior art.

[0006] In a first aspect, to solve the above technical problems, the present disclosure provides a driving circuit, including:

[0007] a voltage amplifying circuit electrically connected to the signal input terminal and the signal output terminal, wherein the voltage amplifying circuit is configured to amplify the voltage of the signal input terminal and output the amplified voltage to the signal output terminal;

[0008] A current amplification circuit is electrically connected to the intermediate node and the signal output terminal, and the current amplification circuit is configured to input a compensation current to the signal output terminal so that the current at the signal output terminal is the sum of the current at the input signal terminal and the compensation current; wherein the current at the intermediate node is the same as the current at the signal input terminal.

[0009] In some embodiments, the voltage amplification circuit includes:

[0010] an operational amplifier, wherein a non-inverting input terminal of the operational amplifier is electrically connected to the input signal terminal, an output terminal of the operational amplifier is electrically connected to the intermediate node, and two power supply terminals of the operational amplifier are electrically connected to a positive power supply and a negative power supply, respectively;

[0011] a feedback circuit electrically connected to the signal output terminal and the inverting input terminal of the operational amplifier, the feedback circuit being configured to feed back the voltage of the signal output terminal to the inverting input terminal of the operational amplifier;

[0012] The first resistor is connected between the inverting input terminal and the ground terminal.

[0013] In some embodiments, the feedback circuit includes a second resistor.

[0014] In some embodiments, the current amplifying circuit includes:

[0015] at least one first current amplifying circuit, wherein a control terminal of the first current amplifying circuit is electrically connected to the intermediate node, a first terminal of the first current amplifying circuit is electrically connected to a positive power supply, an output terminal of the first current amplifying circuit is electrically connected to the signal output terminal, and the first current amplifying circuit is configured to input a compensation current greater than zero to the signal output terminal in response to a potential difference between the intermediate node and the signal output terminal when a voltage at the intermediate node is greater than zero;

[0016] At least one second current amplifying circuit, wherein the control end of the second current amplifying circuit is electrically connected to the intermediate node, the second end of the second current amplifying circuit is electrically connected to the negative power supply, the output end of the second current amplifying circuit is electrically connected to the signal output end, and the second current amplifying circuit is configured to input a compensation current less than 0 to the signal output end in response to the potential difference between the intermediate node and the signal output end when the voltage of the intermediate node is less than 0.

[0017] In some embodiments, the current amplifying circuit further includes:

[0018] a third resistor electrically connected to the intermediate node and the signal output end, and configured to limit the potential difference between the intermediate node and the signal output end node to be close to 0 when the first current amplifier or the second current amplifier is working, and output the current of the intermediate node to the signal output end when the first current amplifier or the second current amplifier is not working.

[0019] In some embodiments, the first current amplifying circuit includes:

[0020] a first transistor, wherein a first electrode of the first transistor is electrically connected to the positive power supply;

[0021] a fourth resistor, electrically connected between the intermediate node and the control electrode of the first transistor;

[0022] A fifth resistor is electrically connected between the second electrode of the first transistor and the signal output end.

[0023] In some embodiments, the second current amplifying circuit includes:

[0024] a second transistor, wherein a first electrode of the second transistor is electrically connected to the negative power supply;

[0025] a sixth resistor connected between the intermediate node and the control electrode of the second transistor;

[0026] A seventh resistor is connected between the second electrode of the second transistor and the signal output end.

[0027] In some embodiments, the fourth resistor has the same resistance as the sixth resistor;

[0028] The fifth resistor and the seventh resistor have the same resistance value.

[0029] In some embodiments, the first transistor and the second transistor are triodes or metal oxide semiconductor field effect transistors.

[0030] In some embodiments, the metal oxide semiconductor field effect transistor includes an enhancement mode metal oxide semiconductor field effect transistor and a depletion mode metal oxide semiconductor field effect transistor.

[0031] In some embodiments, the resistance of the first current limiting resistor is less than 1 kΩ.

[0032] In some embodiments, when the current amplifying circuit includes k first current amplifying circuits, the compensation current output by the current amplifying circuit is k times the current output by one first current amplifying circuit; wherein k is an integer greater than 1.

[0033] In some embodiments, when the current amplifying circuit includes M second current amplifying circuits, the compensation current output by the current amplifying circuit is M times the current output by one second current amplifying circuit; wherein M is an integer greater than 1.

[0034] In some embodiments, the number of the first current amplifying circuits is the same as the number of the second current amplifying circuits.

[0035] In some embodiments, a voltage ratio between the signal output terminal and the signal input terminal is a sum of a ratio of the second resistor to the first resistor and 1.

[0036] In a second aspect, an embodiment of the present disclosure provides a tactile feedback system, comprising:

[0037] tactile feedback display;

[0038] A detection module is configured to detect whether a touch object touches the tactile feedback display screen, and if so, generate a corresponding digital signal;

[0039] a microcontroller unit configured to, after receiving the digital signal, determine whether a value corresponding to the digital signal is greater than a preset value, and output a driving signal if so;

[0040] As described in the first aspect, the driving circuit is configured to receive the driving signal through the signal input terminal, and output the driving signal to the tactile feedback display through the signal output terminal after processing the driving signal, thereby driving the tactile feedback display to operate.

[0041] In some embodiments, the tactile feedback system further includes: a port module, through which the microcontroller receives a control instruction sent by a host computer, and allows or prohibits the microcontroller from outputting the drive signal according to the control instruction;

[0042] The power supply module is configured to supply power to the tactile feedback display screen, the detection module, the micro control unit, the drive circuit and the port module. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] FIG1 is a schematic structural diagram of a tactile feedback system provided by an embodiment of the present disclosure;

[0044] FIG2a is a schematic diagram of some structures of a tactile feedback panel provided by an embodiment of the present disclosure;

[0045] FIG2 b is a schematic diagram of another structure of a tactile feedback panel provided by an embodiment of the present disclosure;

[0046] FIG2c is a schematic diagram of some further structures of a tactile feedback panel provided by an embodiment of the present disclosure;

[0047] FIG2 d is a schematic diagram of some further structures of a tactile feedback panel provided by an embodiment of the present disclosure;

[0048] FIG2e is a schematic diagram of some further structures of a tactile feedback panel provided by an embodiment of the present disclosure;

[0049] FIG3 is a schematic cross-sectional view of the tactile feedback panel shown in FIG2a along the CC' direction;

[0050] FIG4 is a schematic cross-sectional view of a piezoelectric device according to an embodiment of the present disclosure;

[0051] FIG5 is a schematic structural diagram of another tactile feedback system provided by an embodiment of the present disclosure;

[0052] FIG6 is a schematic structural diagram of a driving circuit provided in an embodiment of the present disclosure;

[0053] FIG7 is a schematic structural diagram of a voltage amplification circuit provided by an embodiment of the present disclosure;

[0054] FIG8 is a schematic structural diagram of another voltage amplification circuit provided by an embodiment of the present disclosure;

[0055] 9 and 10 are schematic structural diagrams of a current amplifying circuit provided by an embodiment of the present disclosure;

[0056] FIG11 is a schematic structural diagram of another current amplifying circuit provided by an embodiment of the present disclosure;

[0057] FIG12 is a schematic structural diagram of a first current amplifying circuit provided in an embodiment of the present disclosure;

[0058] FIG13 is a schematic structural diagram of another driving circuit provided in an embodiment of the present disclosure.

[0059] Reference numerals: tactile feedback display screen 100, detection module 200, microcontroller unit 300, driving circuit 400, port module 500, power module 600, base substrate 1, piezoelectric device 2, touch layer 3, touch electrode 31, bottom electrode 21, top electrode 22, piezoelectric layer 23, insulating layer 25, routing layer 26, binding electrode 24, first via V1, second via V2, tactile detection piezoelectric device 021, tactile driving piezoelectric device 022, lead electrode 025, lead electrode via 41, first connecting portion 0221, tactile detection signal line 322, tactile driving signal line 321, supporting layer 4, supporting portion 411; Voltage amplifier circuit 1', current amplifier circuit 2', operational amplifier 11', feedback circuit 12', first resistor R1, second resistor R2, first current amplifier circuit 21', second current amplifier circuit 22', first transistor TFT1, second transistor TFT2, third resistor R3, fourth resistor R4, fifth resistor R5, sixth resistor R6, seventh resistor R7, signal input terminal IN, signal output terminal OUT, intermediate node A, non-inverting input terminal +, inverting input terminal -, positive power supply +VCC, negative power supply -VCC, control terminal a, first terminal b, output terminal c, second terminal d. DETAILED DESCRIPTION

[0060] The embodiments of the present disclosure provide a driving circuit and a tactile feedback system to solve the technical problem of insufficient driving capability of the vibration actuator in the large vehicle central control screen in the prior art.

[0061] In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and easy to understand, the present disclosure will be further described below with reference to the accompanying drawings and examples. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present disclosure more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in the present disclosure are all explained using the accompanying drawings as examples, but changes can be made as needed, and all changes are included in the scope of protection of the present disclosure. The drawings of the present disclosure are only used to illustrate relative position relationships and do not represent true proportions.

[0062] It should be noted that specific details are set forth in the following description to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in a variety of ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present disclosure. Therefore, the present disclosure is not limited to the specific embodiments disclosed below. The subsequent description of the specification is a preferred embodiment for implementing the present application, but the description is for the purpose of illustrating the general principles of the present application and is not intended to limit the scope of the present application. The scope of protection of the present application shall be determined as defined by the appended claims.

[0063] A driving circuit and a tactile feedback system provided by an embodiment of the present disclosure are described in detail below with reference to the accompanying drawings.

[0064] Please refer to FIG1 for a structural diagram of a tactile feedback system provided in an embodiment of the present disclosure. The tactile feedback system includes:

[0065] tactile feedback display screen 100;

[0066] The detection module 200 is configured to detect whether a touch object touches the tactile feedback display screen 100, and if so, generates a corresponding digital signal;

[0067] The micro control unit 300 is configured to, after receiving the digital signal, determine whether the value corresponding to the digital signal is greater than a preset value, and output a driving signal if so;

[0068] The driving circuit 400 is configured to receive a driving signal through a signal input terminal, process the driving signal, and output the signal to the tactile feedback display 100 through a signal output terminal, thereby driving the tactile feedback display 100. The specific structure of the driving circuit 400 is described in the subsequent embodiments of the driving circuit 400 and is not further described here.

[0069] For example, the tactile feedback display provided by the embodiments of the present disclosure can be applied to automotive electronics. Specifically, the tactile feedback display can be used in vehicle-mounted central control screens, vehicle-mounted displays, and the like. When the user is using the tactile feedback display, such as when verifying a fingerprint or inputting via on-screen virtual buttons, the tactile feedback display can generate vibration and tactile feedback of mechanical properties via an internal vibration actuator. This vibration actuator is driven by a drive circuit.

[0070] In some embodiments of the present disclosure, as shown in Figures 2a to 3, a tactile feedback display screen 100 includes: a base substrate 1, a plurality of piezoelectric devices 2 arranged in an array on one side of the base substrate 1, and a touch layer 3 located on the side of the base substrate 1 facing away from the piezoelectric devices 2; the piezoelectric devices 2 are configured to vibrate in response to a processed drive signal output by a drive circuit 400, thereby driving the base substrate 1 to vibrate. The tactile feedback display screen 100 provided in the embodiments of the present disclosure, by integrating the base substrate 1 and the touch layer 3, can implement touch control functions (e.g., determining a touch position) and tactile reproduction functions.

[0071] In some embodiments of the present disclosure, as shown in Figures 2a to 3, a touch layer 3 is attached to the surface of the base substrate 1 and provides the system with information such as the touch location during the touch process. Exemplarily, the touch layer 3 is divided into a plurality of touch electrodes 31 spaced apart from each other. Exemplarily, the touch electrodes 31 can be self-capacitive touch electrodes, which can implement touch functionality using self-capacitive technology to determine the coordinates of the touch location. The touch electrodes 31 can also be mutual-capacitive touch electrodes, which can implement touch functionality using mutual-capacitive technology to determine the coordinates of the touch location.

[0072] In some embodiments of the present disclosure, as shown in FIG2a , the piezoelectric device 2 may be a piezoelectric film, and a given voltage signal can directly provide vibration excitation, so that the tactile feedback display screen 100 generates a tactile feedback effect.

[0073] In some embodiments of the present disclosure, as shown in Figures 2a to 3, the base substrate 1 is a substrate that is in direct contact with tactile senses such as fingers, and can be a touchpad, a display screen, etc.; specifically, the base substrate 1 can be a substrate made of glass, or a substrate made of silicon or silicon dioxide (SiO2), or a substrate made of sapphire, or a substrate made of a metal wafer. No limitation is made here, and those skilled in the art can set the base substrate according to actual application needs.

[0074] In some embodiments of the present disclosure, as shown in Figure 4, Figure 4 is a schematic cross-sectional structural diagram of a piezoelectric device 2, the piezoelectric device 2 including: a bottom electrode 21 and a top electrode 22 arranged opposite to each other, a piezoelectric layer 23 located between the bottom electrode 21 and the top electrode 22, an insulating layer 25 located on the side of the top electrode 22 away from the piezoelectric layer 23, and a routing layer 26 located on the side of the insulating layer 25 away from the piezoelectric layer 23. The piezoelectric device 2 may further include: a binding electrode 24 arranged in the same layer as the bottom electrode 21, the binding electrode 24 is arranged near the edge of the base substrate 1, wherein the insulating layer 25 has a first via hole V1 arranged corresponding to the top electrode 22, one end of the routing layer 26 is electrically connected to the top electrode 22 through the first via hole V1, and the other end of the routing layer 26 is electrically connected to the binding electrode 24 through a second via hole V2 penetrating the insulating layer 25.

[0075] In some embodiments of the present disclosure, as shown in Figures 2a to 3, the multiple piezoelectric devices 2 are divided into at least one tactile detection piezoelectric device 021 and at least one tactile driving piezoelectric device 022. That is, part of the piezoelectric device 2 can be set as the tactile detection piezoelectric device 021, and the rest can be set as the tactile driving piezoelectric device 022. For example, one tactile detection piezoelectric device and one tactile driving piezoelectric device can be set respectively. Alternatively, a plurality of tactile detection piezoelectric devices 021 and a plurality of tactile driving piezoelectric devices 022 can also be set respectively (that is, at least two or more are set), and the plurality of tactile detection piezoelectric devices 021 and the plurality of tactile driving piezoelectric devices 022 are evenly dispersed on the base substrate 1.

[0076] Optionally, as shown in FIG. 2 a , the plurality of tactile detection piezoelectric devices 021 and the plurality of tactile driving piezoelectric devices 022 may be arranged on the base substrate 1 in a checkerboard arrangement.

[0077] Optionally, as shown in FIG2b , the multiple tactile detection piezoelectric devices 021 can be divided into multiple columns, and the multiple tactile driving piezoelectric devices 022 can also be divided into multiple columns, and a column of tactile detection piezoelectric devices 021 and a column of tactile driving piezoelectric devices 022 are arranged alternately. The bottom electrodes 21 of the tactile detection piezoelectric devices 021 in a column of tactile detection piezoelectric devices 021 are spaced apart from each other, and the bottom electrodes 21 of the tactile driving piezoelectric devices 022 in a column of tactile driving piezoelectric devices 022 are also spaced apart from each other. For example, the number of tactile detection piezoelectric devices 021 in a column of tactile detection piezoelectric devices 021 is less than the number of tactile driving piezoelectric devices 022 in a column of tactile driving piezoelectric devices 022. Furthermore, the device further includes: a lead electrode 025 disposed on the same layer as the bottom electrode 21, the lead electrode 025 being electrically connected to the bottom electrode 21 and being grounded. Furthermore, a lead electrode via hole 41 is formed at the position of the lead electrode 025 so that the external lead and the lead electrode 025 are connected by silver glue or the like.

[0078] Optionally, as shown in FIG2c , the plurality of tactile detection piezoelectric devices 021 can be divided into multiple columns, and the plurality of tactile driving piezoelectric devices 022 can also be divided into multiple columns, and a column of tactile detection piezoelectric devices 021 and a column of tactile driving piezoelectric devices 022 are arranged alternately. Furthermore, the tactile detection piezoelectric devices 021 and the tactile driving piezoelectric devices 022 are arranged in an array. The bottom electrodes 21 of the tactile detection piezoelectric devices 021 in a column of tactile detection piezoelectric devices 021 are electrically connected to each other, and the bottom electrodes 21 of the tactile driving piezoelectric devices 022 in a column of tactile driving piezoelectric devices 022 are electrically connected to each other. For example, in a column of tactile detection piezoelectric devices 021, the bottom electrode 21-1 of the tactile detection piezoelectric device 021 is electrically connected to the bottom electrode 21-2 via the first connecting portion 0221, and the bottom electrodes 21-2 are electrically connected to each other via the first connecting portion 0221. Furthermore, in a column of haptic driving piezoelectric devices 022 , the bottom electrode 21 - 3 of the haptic driving piezoelectric device 022 is electrically connected to the bottom electrode 21 - 4 via the second connection portion 0211 , and the bottom electrode 21 - 4 is electrically connected to the bottom electrode 21 - 4 via the second connection portion 0211 .

[0079] Optionally, as shown in FIG2 d , the multiple tactile detection piezoelectric devices 021 can be divided into multiple columns, and the multiple tactile driving piezoelectric devices 022 can also be divided into multiple columns, and a column of tactile detection piezoelectric devices 021 and a column of tactile driving piezoelectric devices 022 are arranged alternately. Furthermore, the tactile detection piezoelectric devices 021 and the tactile driving piezoelectric devices 022 are arranged in an array. The bottom electrodes 21 of the tactile detection piezoelectric devices 021 in a column of tactile detection piezoelectric devices 021 are spaced apart from each other, and the bottom electrodes 21 of the tactile driving piezoelectric devices 022 in a column of tactile driving piezoelectric devices 022 are spaced apart from each other. Furthermore, each tactile detection piezoelectric device 021 is respectively connected to a tactile detection signal line 322 to transmit signals via the tactile detection signal line 322. Each tactile driving piezoelectric device 022 is respectively connected to a tactile driving signal line 321 to transmit signals via the tactile detection signal line 321.

[0080] Optionally, as shown in FIG2e , the plurality of tactile detection piezoelectric devices 021 and the plurality of tactile driving piezoelectric devices 022 can also be disposed in the non-display area of ​​the display panel. Furthermore, within a column, the tactile detection piezoelectric devices 021 and the tactile driving piezoelectric devices 022 are arranged alternately. Furthermore, the tactile detection piezoelectric devices 021 and the tactile driving piezoelectric devices 022 can be connected to the driving circuit 400 via the connection interface DP.

[0081] Of course, the multiple tactile detection piezoelectric devices and the multiple tactile driving piezoelectric devices may also be arranged on the base substrate 1 in other arrangements, which is not limited in the present disclosure.

[0082] For example, in the tactile detection piezoelectric device 021, the bottom electrode 21 is grounded, and the binding electrode 24 is connected to the drive detection terminal. When a finger touches the surface of the substrate 1, the top electrode 22 generates a charge signal, which can be output by the drive detection terminal. The detection module 200 is electrically connected to the tactile detection piezoelectric device 021 via the tactile detection signal line 321. In this way, the detection module 200 can detect whether a touch object (such as a user's finger) is touching the tactile feedback display screen 100 through the tactile detection piezoelectric device 021. When it is determined that a touch object is touching the tactile feedback display screen 100, the detection module 200 generates a digital signal corresponding to the pressure of the touch object touching the tactile feedback display screen 100 and sends it to the micro control unit 300. After receiving the above-mentioned digital signal, the microcontroller unit 300 determines whether the pressure value corresponding to the digital signal is greater than the preset value. If the pressure value corresponding to the digital signal is greater than the preset value, the drive signal is output to the drive circuit 400. After the drive circuit 400 processes the drive signal provided by the microcontroller unit 300, the processed drive signal is output to the tactile drive piezoelectric device 022 in the tactile feedback display screen 100 through the tactile drive signal 321.

[0083] For example, in the tactile driving piezoelectric device 022, the bottom electrode 21 is grounded, the binding electrode 24 is connected to the signal output terminal of the driving circuit 400, and the processed driving signal output by the signal output terminal of the driving circuit 400 is an AC voltage signal. The AC voltage signal (V AC ), an alternating electric field can be formed between the top electrode 22 and the bottom electrode 21. The frequency of the alternating electric field is the same as the frequency of the AC voltage signal. Under the action of the alternating electric field, the piezoelectric layer 23 deforms and generates a vibration signal. The frequency of this vibration signal is the same as the frequency of the alternating electric field. When the frequency of the vibration signal is close to or equal to the natural frequency of the substrate 1, the substrate 1 resonates, the amplitude increases, and a tactile feedback signal is generated. When a finger touches the surface of the substrate 1, the vibration feedback can be clearly felt. In some embodiments of the present disclosure, the bottom electrode 21 and the binding electrode 24 can be formed of the same material and using the same patterning process.

[0084] It should be noted that the bottom electrode 21 of all piezoelectric devices 2 in FIG. 2 a may be a patterned structure or a solid structure. The piezoelectric layer 23 of all piezoelectric devices 2 may be a patterned structure or a solid structure. The top electrode 22 of all piezoelectric devices 2 may be a patterned structure, for example, the top electrode 22 of all piezoelectric devices 2 may be a patterned structure corresponding one-to-one to the piezoelectric layer 22.

[0085] In a specific implementation, the material of the piezoelectric layer can be lead zirconate titanate (Pb(Zr,Ti)O3, PZT), or aluminum nitride (AlN), ZnO (zinc oxide), barium titanate (BaTiO3), lead titanate (PbTiO3), potassium niobate (KNbO3), lithium niobate (LiNbO3), lithium tantalate (LiTaO3), lanthanum gallium silicate (La3Ga5SiO 14 ), and the material for the piezoelectric layer can be selected based on the actual needs of those skilled in the art, and is not limited here. Specifically, when PZT is used to form the piezoelectric layer, due to its high piezoelectric coefficient, the piezoelectric properties of the corresponding tactile feedback display screen 100 are guaranteed, and the corresponding tactile feedback display screen 100 can be applied to tactile feedback devices. Furthermore, PZT has high light transmittance, and when integrated into a display device, it does not affect the display quality of the display device.

[0086] In the specific implementation process, the top electrode and the bottom electrode of the piezoelectric device are transparent conductive materials. For example, they can be made of indium tin oxide (ITO), indium zinc oxide (IZO), titanium-gold (Ti-Au) alloy, titanium-aluminum-titanium (Ti-Al-Ti) alloy, and titanium-molybdenum (Ti-Mo) alloy. In addition, they can also be made of one of titanium (Ti), gold (Au), silver (Ag), molybdenum (Mo), copper (Cu), tungsten (W), and chromium (Cr). Those skilled in the art can set the above-mentioned transparent conductive electrodes according to actual application needs, and are not limited here.

[0087] In some embodiments of the present disclosure, as shown in Figures 2a to 3, a support layer 4 is further included on the base substrate 1, and the support layer 4 and the piezoelectric device 2 are located on the same side of the base substrate 1. Specifically, the support layer 4 mainly serves to connect the base substrate 1 and the device. The device can be a support frame or a support flat plate. Specifically, the device mainly serves to support the tactile feedback panel 100, and can be a frame of a display screen, a frame of a touchpad, etc. Specifically, the device and the support layer 4 can be fixedly connected by an adhesive layer (such as optical adhesive, OCA) or the like.

[0088] In some embodiments of the present disclosure, the material of the support layer 4 may include, but is not limited to, at least one of the following: rubber, foam, foam cotton, polydimethylsiloxane (PDMS). Specifically, the support layer 4 and the base substrate 1 may be fixedly connected by an adhesive layer (such as optical adhesive, OCA) or the like. Exemplarily, the support layer 4 may include a support portion 411 located around the base substrate 1 and arranged around all piezoelectric devices 2. Optionally, the orthographic projection shape of the support layer 4 (support portion 411) on the base substrate 1 includes a square, triangle, circle, trapezoid or polygon, etc. Of course, the present disclosure does not limit the specific position of the support layer 4. The position of the support layer 4 can be determined according to the needs of actual applications and is not limited here.

[0089] Please refer to FIG5 for a schematic diagram of the structure of another tactile feedback system provided by an embodiment of the present disclosure. The tactile feedback system further includes:

[0090] The microcontroller unit 300 receives control commands from a host computer through the port module 500 and, based on the control commands, enables or disables the microcontroller unit 300 from outputting drive signals. The host computer can be a central processing unit, a vehicle's electronic control unit, or a user's mobile terminal (such as a cell phone). The port module 500 can be a serial communication port, a Bluetooth communication port, or other communication port, depending on the communication method between the microcontroller unit 300 and the host computer.

[0091] The power module 600 is configured to supply power to the tactile feedback display screen 100 , the detection module 200 , the micro control unit 300 , the driving circuit 400 and the port module 500 .

[0092] When the user sets the tactile feedback function on the tactile feedback display screen 100, the upper computer generates a signal that allows the microcontroller unit 300 to output a driving signal when it determines that the pressure value of the touch body pressing the tactile feedback display screen is greater than a preset value. After receiving the above driving signal, the driving circuit can process the driving signal and generate a processed driving signal to provide to the piezoelectric device 2.

[0093] In the embodiment provided by the present disclosure, by providing a port module 500 for the tactile feedback system to communicate with the host computer, it is convenient to set whether the visual feedback display screen performs visual feedback, which can effectively improve the user experience.

[0094] Please refer to FIG6 for a schematic diagram of the structure of a driving circuit provided in an embodiment of the present disclosure. The driving circuit includes:

[0095] The voltage amplifier circuit 1' is electrically connected to the signal input terminal IN and the signal output terminal OUT. The voltage amplifier circuit 1' is configured to amplify the voltage of the signal input terminal IN and output it to the signal output terminal OUT.

[0096] The current amplifying circuit 2' is electrically connected to the intermediate node A and the signal output terminal OUT. The current amplifying circuit 2' is configured to input a compensation current to the signal output terminal OUT so that the current at the signal output terminal OUT is the sum of the current at the input signal terminal and the compensation current; wherein the current at the intermediate node A is the same as the current at the signal input terminal IN.

[0097] In the embodiment provided in the present disclosure, the driving circuit is provided with a voltage amplifying circuit 1' and a current amplifying circuit 2'. Through the mutual cooperation of the voltage amplifying circuit 1' and the current amplifying circuit 2', a driving signal with a large current and a large voltage is output to at least one tactile driving piezoelectric device through a numerical value corresponding to a digital signal obtained based on the charge signal of the tactile detection piezoelectric device, so as to achieve an ideal vibration effect by driving a tactile driving detection piezoelectric device with a large mass carrier through the driver.

[0098] FIG7 is a schematic diagram of a voltage amplifier circuit according to an embodiment of the present disclosure. The voltage amplifier circuit 1′ includes:

[0099] Operational amplifier 11', the non-inverting input terminal + of the operational amplifier 11' is electrically connected to the input signal terminal, the output terminal c of the operational amplifier 11' is electrically connected to the intermediate node A, and the two power supply terminals of the operational amplifier 11' are electrically connected to the positive power supply +VCC and the negative power supply -VCC respectively; the operational amplifier 11' is configured to amplify the voltage of the signal input terminal IN and output it to the intermediate node A, and output the current of the signal input terminal IN to the intermediate node A. The current amplifier compensates the current of the intermediate node A and outputs it to the signal output terminal OUT.

[0100] A feedback circuit 12' is electrically connected to the signal output terminal OUT and the inverting input terminal - of the operational amplifier 11'. The feedback circuit 12' is configured to feed back the voltage of the signal output terminal OUT to the inverting input terminal of the operational amplifier 11'.

[0101] The first resistor R1 is connected between the inverting input terminal - and the ground terminal.

[0102] In the embodiment provided by the present disclosure, the voltage amplifier circuit 1' is provided with an operational amplifier 11', a feedback circuit 12' and a first resistor R1. By allowing the feedback circuit 12' to feed back the voltage of the signal output terminal OUT (i.e., the voltage after the operational amplifier 11' is amplified) to the inverting input terminal - of the operational amplifier 11', the gain of the operational amplifier 11' is reduced, thereby improving the output stability of the voltage amplifier circuit 1' and reducing nonlinear distortion and noise.

[0103] In some embodiments, the feedback circuit 12 ′ includes a second resistor R2 . FIG8 is a schematic structural diagram of another voltage amplification circuit provided by an embodiment of the present disclosure.

[0104] In the embodiment provided in the present disclosure, by setting the feedback circuit 12 ′ to the second resistor R2 , the stability of the feedback voltage signal of the feedback circuit 12 ′ can be improved.

[0105] In some embodiments, the voltage ratio of the signal output terminal OUT to the signal input terminal IN is the sum of the ratio of the second resistor R2 to the first resistor R1 and 1.

[0106] For example, let the voltage of the signal output terminal OUT be Vout, and let the voltage of the signal input terminal IN be Vin, then: Vout=Vin(1+R2 / R1).

[0107] 9 and 10 are schematic diagrams of a current amplifying circuit according to an embodiment of the present disclosure. The current amplifying circuit 2' includes:

[0108] at least one first current amplifying circuit 21', wherein a control terminal a of the first current amplifying circuit 21' is electrically connected to an intermediate node A, a first terminal b of the first current amplifying circuit 21' is electrically connected to a positive power supply +VCC, and an output terminal c of the first current amplifying circuit 21' is electrically connected to a signal output terminal OUT. The first current amplifying circuit 21' is configured to input a compensation current greater than zero to the signal output terminal OUT in response to a potential difference between the intermediate node A and the signal output terminal OUT when a voltage at the intermediate node A is greater than zero.

[0109] At least one second current amplifying circuit 22', a control terminal a of the second current amplifying circuit 22' is electrically connected to the intermediate node A, a second terminal d of the second current amplifying circuit 22' is electrically connected to the negative power supply -VCC, an output terminal c of the second current amplifying circuit 22' is electrically connected to the signal output terminal OUT, and the second current amplifying circuit 22' is configured to input a compensation current less than 0 to the signal output terminal OUT in response to the potential difference between the intermediate node A and the signal output terminal OUT when the voltage of the intermediate node A is less than 0.

[0110] In the embodiment provided in the present disclosure, by setting at least one first current amplifying circuit 21' and at least one second current amplifying circuit 22' in the current amplifying circuit 2', the first current amplifying circuit 21' can be used to compensate the current of the positive phase signal in the driving signal and then output it to the signal output terminal OUT, and the second current amplifying circuit 22' can be used to compensate the current of the negative phase signal in the driving signal and then output it to the signal output terminal OUT, so that the driving circuit can provide sufficient driving current for the tactile driving piezoelectric device.

[0111] In some embodiments, when the current amplifying circuit 2 ′ includes k first current amplifying circuits 21 ′, the compensation current output by the current amplifying circuit 2 ′ is k times the current output by one first current amplifying circuit 21 ′; wherein k is an integer greater than 1.

[0112] For example, the current output by the first current amplifying circuit 21 ′ is I, and the current output by k first current amplifying circuits 21 ′ is k×I.

[0113] In the embodiment provided in the present disclosure, by setting the current amplifying circuit 2' to include k first current amplifying circuits 21', the compensation capability of the current amplifying circuit 2' for the positive phase current can be increased by k times, thereby improving the driving capability of the forward current, so that the current amplifying circuit 2' can drive a tactile-driven piezoelectric device with an extremely large capacitance, or simultaneously drive multiple tactile-driven piezoelectric devices in parallel.

[0114] In other embodiments, when the current amplifying circuit 2 ′ includes M second current amplifying circuits 22 ′, the compensation current output by the current amplifying circuit 2 ′ is M times the current output by one second current amplifying circuit 22 ′; wherein M is an integer greater than 1.

[0115] For example, if the current output by the second current amplifying circuit 22 ′ is −I, then the current output by the M first current amplifying circuits 21 ′ is −M×I.

[0116] In the embodiment provided in the present disclosure, by setting the current amplifying circuit 2' to include M second current amplifying circuits 22', the compensation capability of the current amplifying circuit 2' for the reverse current can be increased by M times, thereby improving the driving capability of the reverse current, so that the current amplifying circuit 2' can drive a tactile-driven piezoelectric device with an extremely large capacitance, or simultaneously drive multiple tactile-driven piezoelectric devices in parallel.

[0117] In some embodiments, the number of first current amplifying circuits 21' and second current amplifying circuits 22' is the same. That is, k and M can be set equal. For example, the current amplifying circuit 2' can include two first current amplifying circuits 21' and two second current amplifying circuits 22'. This can double the current compensation capability of the current amplifying circuit 2' for the driving signal, enabling the current amplifying circuit 2' to drive a haptic-driving piezoelectric device with an extremely large capacitance or simultaneously drive multiple haptic-driving piezoelectric devices connected in parallel.

[0118] Please refer to FIG11 which is a schematic structural diagram of another current amplifying circuit provided by an embodiment of the present disclosure. The current amplifying circuit 2′ further includes:

[0119] The third resistor R3 is electrically connected to the intermediate node A and the signal output terminal OUT. The third resistor R3 is configured to limit the potential difference between the intermediate node A and the signal output terminal OUT to close to 0 when the first current amplifier or the second current amplifier is working, and output the current of the intermediate node A to the signal output terminal OUT when the first current amplifier or the second current amplifier is not working.

[0120] In some embodiments, the third resistor R3 is generally set to be relatively small, such as less than 1 kΩ. The specific resistance value of the third resistor R3 can be determined according to the devices used in the first current amplifying circuit 21 ′ and the second current amplifying circuit 22 ′.

[0121] As shown in FIG11 , assuming the voltage inputted at signal input terminal IN is 5V, after being amplified 20 times by operational amplifier 11′, the voltage at intermediate node A is 100V. Assuming the voltage inputted at signal input terminal IN is -5V, after being amplified 20 times by operational amplifier 11′, the voltage at intermediate node A is -100V. Since the resistance of third resistor R3 is less than 1 kΩ, the voltage across third resistor R3 accounts for a relatively small proportion. Therefore, it can be roughly considered that the voltage at intermediate node A is substantially the same as the voltage at node B. After the current at intermediate node A is compensated by first current amplifier circuit 21′ and second current amplifier circuit 22′, a processed driving signal is formed at node B, which has the same voltage as intermediate node A but with amplified current driving capability, and is then output through the signal output node.

[0122] Although the potential difference between the intermediate node A and the node B is close to zero, there is still a potential difference between them. When the voltage of the intermediate node A is greater than zero, due to the potential difference between the intermediate node A and the node B, the first current amplifier circuit 21' can be turned on, and the first terminal b of the first current amplifier circuit 21' is connected to the output terminal c, forming a channel from the positive power supply +VCC through the first terminal b of the first current amplifier circuit 21' to the signal output terminal OUT, thereby compensating the current of the drive signal and amplifying the positive current of the drive signal. Similarly, when the voltage of the intermediate node A is less than zero, due to the potential difference between the intermediate node A and the node B, the second current amplifier circuit 22' can be turned on, and the second terminal d of the second current amplifier circuit 22' is connected to the output terminal c, thereby forming a channel from the negative power supply -VCC through the second terminal d of the second current amplifier circuit 22' to the signal output terminal OUT, thereby compensating the current of the drive signal and amplifying the negative current of the drive signal.

[0123] In the embodiment provided by the present disclosure, by providing a third resistor R3 between the intermediate node A and the signal output terminal OUT, the first current amplifying circuit 21' or the second current amplifying circuit 22' can be timely started according to the phase of the driving signal, thereby timely compensating the current of the driving signal, so that the driving circuit can compensate for the appropriate current according to the change of the load.

[0124] Please refer to FIG12 , which is a schematic structural diagram of a first current amplifying circuit provided in an embodiment of the present disclosure. The first current amplifying circuit 21 ′ in the driving circuit includes:

[0125] a first transistor TFT1, wherein a first electrode of the first transistor TFT1 is electrically connected to a positive power supply +VCC;

[0126] a fourth resistor R4 electrically connected between the intermediate node A and the control electrode of the first transistor TFT1; the fourth resistor R4 is configured to limit the current flowing into the control electrode of the first transistor TFT1;

[0127] The fifth resistor R5 is electrically connected between the second electrode of the first transistor TFT1 and the signal output terminal OUT.

[0128] The first transistor TFT1 is configured to, when the voltage at the intermediate node A is greater than 0, turn on the first and second electrodes of the first transistor TFT1 in response to the potential difference between the intermediate node A and the signal output terminal OUT, so that the signal output terminal OUT passes a compensation current through the channel formed by the first and second electrodes and the fifth resistor R5. When the voltage at the intermediate node A is greater than 0, the potential difference between the voltage at the intermediate node A and the signal output terminal OUT is generally greater than or equal to the turn-on voltage of the first transistor TFT1. For example, if the turn-on voltage of the first transistor TFT1 is 0.7V, the potential difference between the voltage at the intermediate node A and the signal output terminal OUT is greater than or equal to 0.7V.

[0129] The second current amplifying circuit 22' comprises:

[0130] a second transistor TFT2, wherein a first electrode of the second transistor TFT2 is electrically connected to a negative power supply -VCC;

[0131] a sixth resistor R6 connected between the intermediate node A and the control electrode of the second transistor TFT2; the sixth resistor R6 is configured to limit the current flowing into the control electrode of the second transistor TFT2;

[0132] The seventh resistor R7 is connected between the second electrode of the second transistor TFT2 and the signal output terminal OUT.

[0133] The second transistor TFT2 is configured to, when the voltage at the intermediate node A is less than 0, turn on the first and second electrodes of the second transistor TFT2 in response to the potential difference between the intermediate node A and the signal output terminal OUT, so that the signal output terminal OUT passes a compensation current through the channel formed by the first and second electrodes and the seventh resistor R7. When the voltage at the intermediate node A is less than 0, the potential difference between the voltage at the intermediate node A and the signal output terminal OUT is generally less than or equal to the turn-on voltage of the second transistor TFT2. For example, if the turn-on voltage of the second transistor TFT2 is -0.7V, the potential difference between the voltage at the intermediate node A and the signal output terminal OUT is less than or equal to -0.7V.

[0134] In the embodiment provided by the present disclosure, by setting the first current amplifying circuit 21' to include a first transistor TFT1, a fourth resistor R4 and a fifth resistor R5, the first transistor TFT1, the fourth resistor R4 and the fifth resistor R5 cooperate with each other to compensate for the positive phase current of the driving signal and output it to the signal output terminal OUT; by setting the second current amplifying circuit 22' to include a second transistor TFT2, a sixth resistor R6 and a seventh resistor R7, the second transistor TFT2, the sixth resistor R6 and the seventh resistor R7 cooperate with each other to compensate for the negative phase current of the driving signal and output it to the signal output terminal OUT, thereby being able to compensate for the current of the driving signal, so that the current amplifying circuit 2' can drive a large-capacitance tactile-driven piezoelectric device.

[0135] In some embodiments, the first transistor TFT1 and the second transistor TFT2 are transistors with opposite polarities. For example, the first transistor TFT1 is an N-type transistor, and the second transistor TFT2 is a P-type transistor.

[0136] In the embodiment provided by the present disclosure, by setting the first transistor TFT1 and the second transistor TFT2 to be transistors with opposite polarities, the positive phase current and the negative phase current of the driving signal can be amplified with equal amplitudes.

[0137] In some embodiments, the first transistor TFT1 and the second transistor TFT2 are triodes, for example, the first transistor TFT1 is an NPN-type triode and the second transistor TFT2 is a PNP-type triode.

[0138] In other embodiments, the first transistor TFT1 and the second transistor TFT2 are metal-oxide-semiconductor field-effect transistors (MOSFETs). For example, the first transistor TFT1 may be an NMOS transistor, and the second transistor TFT2 may be a PMOS transistor. FIG13 is a schematic diagram of the structure of another driving circuit provided in an embodiment of the present disclosure. In FIG13 , both the first transistor TFT1 and the second transistor TFT2 are MOS transistors, and the current amplification circuit 2 includes two first transistors TFT1 and two second transistors TFT2 as an example.

[0139] In the embodiment provided by the present disclosure, by setting the first transistor TFT1 and the second transistor TFT2 as MOS tubes, the stability of the current amplifier circuit 2' can be improved. Moreover, since the source and drain of the MOS tube can be used interchangeably, the flexibility of the setting of the current amplifier circuit 2' can be improved, and the volume, weight, noise, and power consumption of the current amplifier circuit 2' can be reduced, and the life, input impedance, thermal stability, and anti-interference capability of the current amplifier circuit 2' can be improved.

[0140] In some other embodiments, the MOSFET includes an enhancement mode MOSFET or a depletion mode MOSFET.

[0141] In the embodiment provided by the present disclosure, by setting the MOS transistor as a depletion-type MOS transistor, since the voltage of the control electrode of the MOS transistor can be positive or negative, the setting of the current amplifier circuit 2' composed of the MOS transistor is more flexible, and the voltage control and control method are more convenient.

[0142] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present disclosure.

[0143] Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.

Claims

1. A driving circuit, comprising: A voltage amplifier circuit is electrically connected to the signal input terminal and the signal output terminal, and the voltage amplifier circuit is configured to amplify the voltage of the signal input terminal and output it to the signal output terminal; A current amplification circuit is electrically connected to the intermediate node and the signal output terminal, and the current amplification circuit is configured to input a compensation current to the signal output terminal so that the current at the signal output terminal is the sum of the current at the input signal terminal and the compensation current; wherein the current at the intermediate node is the same as the current at the signal input terminal.

2. The driving circuit according to claim 1, wherein the voltage amplifying circuit comprises: An operational amplifier, wherein a non-inverting input terminal of the operational amplifier is electrically connected to the input signal terminal, an output terminal of the operational amplifier is electrically connected to the intermediate node, and two power supply terminals of the operational amplifier are electrically connected to a positive power supply and a negative power supply respectively; a feedback circuit electrically connected to the signal output terminal and the inverting input terminal of the operational amplifier, the feedback circuit being configured to feed back the voltage of the signal output terminal to the inverting input terminal of the operational amplifier; The first resistor is connected between the inverting input terminal and the ground terminal. 3 . The driving circuit as claimed in claim 2 , wherein the feedback circuit comprises a second resistor.

4. The driving circuit according to any one of claims 1 to 3, wherein the current amplifying circuit comprises: at least one first current amplifying circuit, wherein a control terminal of the first current amplifying circuit is electrically connected to the intermediate node, a first terminal of the first current amplifying circuit is electrically connected to a positive power supply, an output terminal of the first current amplifying circuit is electrically connected to the signal output terminal, and the first current amplifying circuit is configured to input a compensation current greater than 0 to the signal output terminal in response to a potential difference between the intermediate node and the signal output terminal when a voltage of the intermediate node is greater than 0; at least one second current amplifying circuit, the control end of the second current amplifying circuit is electrically connected to the intermediate node, the second end of the second current amplifying circuit is electrically connected to the negative power supply, the output end of the second current amplifying circuit is electrically connected to the signal output end, and the second current amplifying circuit is electrically connected to the signal output end. It is configured that when the voltage of the intermediate node is less than 0, in response to the potential difference between the intermediate node and the signal output terminal, a compensation current less than 0 is input to the signal output terminal.

5. The driving circuit according to claim 4, wherein the current amplifying circuit further comprises: A third resistor is electrically connected to the intermediate node and the signal output terminal. The third resistor is configured to limit the potential difference between the intermediate node and the signal output terminal to be close to 0 when the first current amplifier or the second current amplifier is working, and output the current of the intermediate node to the signal output terminal when the first current amplifier or the second current amplifier is not working.

6. The driving circuit according to claim 4 or 5, wherein the first current amplifying circuit comprises: a first transistor, wherein a first electrode of the first transistor is electrically connected to the positive power supply; a fourth resistor, electrically connected between the intermediate node and the control electrode of the first transistor; A fifth resistor is electrically connected between the second electrode of the first transistor and the signal output terminal.

7. The driving circuit according to claim 6, wherein the second current amplifying circuit comprises: a second transistor, wherein a first electrode of the second transistor is electrically connected to the negative power supply; a sixth resistor connected between the intermediate node and the control electrode of the second transistor; A seventh resistor is connected between the second electrode of the second transistor and the signal output terminal.

8. The driving circuit as claimed in claim 7, wherein the fourth resistor has the same resistance as the sixth resistor; The fifth resistor and the seventh resistor have the same resistance value. 9 . The driving circuit according to claim 8 , wherein the first transistor and the second transistor are triodes or metal oxide semiconductor field effect transistors. 10 . The driving circuit according to claim 9 , wherein the metal oxide semiconductor field effect transistor comprises an enhancement mode metal oxide semiconductor field effect transistor or a depletion mode metal oxide semiconductor field effect transistor.

11. The driving circuit according to any one of claims 4 to 10, wherein the resistance of the first current limiting resistor is less than 1 kΩ.

12. The driving circuit according to any one of claims 4 to 11, wherein when the current amplifier circuit includes k first current amplifier circuits, the compensation current output by the current amplifier circuit is k times the current output by one first current amplifier circuit; wherein, The k is an integer greater than 1.

13. The driving circuit according to any one of claims 4 to 12, wherein when the current amplifier circuit comprises M second current amplifier circuits, the compensation current output by the current amplifier circuit is M times the current output by one second current amplifier circuit; wherein, The M is an integer greater than 1. 14 . The driving circuit according to claim 13 , wherein the number of the first current amplifying circuits is the same as the number of the second current amplifying circuits. 15 . The driving circuit according to claim 3 , wherein a voltage ratio between the signal output terminal and the signal input terminal is a sum of a ratio between the second resistor and the first resistor and 1.

16. A tactile feedback system, comprising: Haptic feedback display; A detection module, configured to detect whether a touch object touches the tactile feedback display screen, and if so, generate a corresponding digital signal; A microcontroller unit is configured to, after receiving the digital signal, determine whether a value corresponding to the digital signal is greater than a preset value, and output a driving signal if so; The driving circuit according to any one of claims 1 to 15, wherein the driving circuit is configured to receive the driving signal through a signal input terminal, and output the driving signal to the tactile feedback display through a signal output terminal after processing the driving signal, so as to drive the tactile feedback display to operate.

17. The tactile feedback system of claim 16, further comprising: A port module, through which the microcontroller receives a control instruction sent by a host computer, and allows or prohibits the microcontroller from outputting the drive signal according to the control instruction; The power module is configured to supply power to the tactile feedback display screen, the detection module, the micro control unit, the drive circuit and the port module.

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