Haptic feedback panel, method of driving the same, and haptic feedback device

Abstract

The embodiment of the present disclosure provides a kind of haptic feedback panel, its driving method and haptic feedback device, comprising: receiving touch signal, according to the touch signal judges the touch position of user in the haptic feedback panel;Determine the characteristic frequency region to which the touch position belongs, the characteristic frequency region is one of the multiple characteristic frequency regions that the substrate of the haptic feedback panel is divided into according to the size of substrate in advance;According to the characteristic frequency region to which the touch position belongs, the characteristic modal displacement field distribution of the substrate is determined, and the characteristic modal displacement field distribution includes the vibration displacement phase information at each position of the substrate;According to the vibration displacement phase information of the characteristic modal displacement field distribution, the multiple piezoelectric devices of array arrangement included in the haptic feedback panel are divided into at least one vibration region;At least part of piezoelectric device in the vibration region is loaded voltage signal.

Description

Technical Field

[0001] This disclosure relates to the field of haptic feedback technology, and in particular to a haptic feedback panel, its driving method, and a haptic feedback device. Background Technology

[0002] Haptics is a key area of ​​technological development today. Specifically, haptic feedback enables interaction between a device and the human body through touch. Summary of the Invention

[0003] This disclosure provides a haptic feedback panel, its driving method, and a haptic feedback device, the specific solutions of which are as follows:

[0004] This disclosure provides a method for driving a haptic feedback panel, comprising:

[0005] Receive touch signals and determine the user's touch position on the haptic feedback panel based on the touch signals;

[0006] The characteristic frequency region to which the touch position belongs is determined. The characteristic frequency region is one of a variety of characteristic frequency regions that are pre-divided into by the substrate of the haptic feedback panel according to the size of the substrate. The substrates corresponding to the same characteristic frequency region have the same characteristic frequency, and the substrates corresponding to different characteristic frequency regions have different characteristic frequencies.

[0007] The characteristic modal displacement field distribution of the substrate is determined based on the characteristic frequency region to which the touch position belongs, and the characteristic modal displacement field distribution includes vibration displacement phase information at each position of the substrate.

[0008] Based on the vibration displacement phase information of the characteristic modal displacement field distribution, the array of multiple piezoelectric devices contained in the tactile feedback panel is divided into at least one vibration region.

[0009] A voltage signal is applied to at least a portion of the piezoelectric devices within the vibration region; wherein the frequency of the voltage signal applied to all the vibration regions is the same as the characteristic frequency of the substrate corresponding to the characteristic frequency region to which the determined touch position belongs, the voltage signal applied within the same vibration region has the same phase, and the voltage signals applied to two adjacent vibration regions have different phases.

[0010] In one possible implementation, in the driving method provided in the embodiments of this disclosure, the plurality of piezoelectric devices arranged in an array included in the tactile feedback panel are divided into at least one vibration region based on the vibration displacement phase information of the characteristic modal displacement field distribution, specifically including:

[0011] When it is determined that the vibration displacement phase information at each position of the substrate has the same vibration displacement direction relative to the initial state of the substrate, all piezoelectric devices contained in the haptic feedback panel are divided into a vibration region.

[0012] In one possible implementation, the driving method provided in the embodiments of this disclosure applies a voltage signal to at least a portion of the piezoelectric devices within the vibration region, specifically including applying a voltage signal with the same amplitude and phase to all piezoelectric devices within the vibration region.

[0013] In one possible implementation, in the driving method provided in the embodiments of this disclosure, the plurality of piezoelectric devices arranged in an array included in the tactile feedback panel are divided into at least one vibration region based on the vibration displacement phase information of the characteristic modal displacement field distribution, specifically including:

[0014] When it is determined that the vibration displacement phase information at each position of the substrate has different vibration displacement directions relative to the initial state of the substrate, multiple piezoelectric devices corresponding to the continuous region formed by the positions with the same vibration displacement direction are divided into a vibration region.

[0015] In one possible implementation, in the driving method provided in the embodiments of this disclosure, applying voltage signals to at least a portion of the piezoelectric devices within the vibration region specifically includes: applying voltage signals with the same phase to at least a portion of the piezoelectric devices within each vibration region with the same vibration displacement direction, and applying voltage signals with a phase difference of 180° to at least a portion of the piezoelectric devices within each vibration region with different vibration displacement directions.

[0016] In one possible implementation, in the driving method provided in the embodiments of this disclosure, a voltage signal with the same voltage amplitude is applied to all piezoelectric devices in all vibration regions.

[0017] In one possible implementation, in the driving method provided in the embodiments of this disclosure, each vibration region is divided into multiple sub-regions according to the magnitude of the vibration displacement, and each sub-region corresponds to a different vibration displacement amplitude.

[0018] A voltage signal is applied to the sub-region with the largest vibration displacement amplitude in each of the vibration regions.

[0019] In one possible implementation, in the driving method provided in the embodiments of this disclosure, each vibration region is divided into multiple sub-regions according to the magnitude of the vibration displacement, and each sub-region corresponds to a different vibration displacement amplitude.

[0020] Within a vibration region, voltage signals with different amplitudes are applied to each sub-region according to the vibration displacement amplitude.

[0021] In one possible implementation, in the driving method provided in the embodiments of this disclosure, voltage signals with progressively decreasing voltage amplitudes are applied along the sub-region with the largest vibration displacement amplitude to the sub-region with the smallest vibration displacement amplitude.

[0022] Accordingly, this disclosure also provides a haptic feedback panel, which is driven by the driving method described above. The haptic feedback panel includes: a substrate, a plurality of piezoelectric devices arranged in an array on one side of the substrate, and a touch layer on the side of the substrate opposite to the piezoelectric devices. The piezoelectric devices are configured to vibrate under the drive of a voltage signal to drive the substrate to vibrate.

[0023] In one possible implementation, the haptic feedback panel provided in the embodiments of this disclosure further includes a support layer located on the substrate, wherein the support layer and the piezoelectric device are located on the same side of the substrate.

[0024] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the support layer includes a first support portion located around the substrate and surrounding all the piezoelectric devices.

[0025] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the number of the first support portions is multiple and they are independent of each other.

[0026] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the first support portion includes a first sub-support portion, which is disposed at the four corners of the substrate, and the shape of the first sub-support portion is L-shaped.

[0027] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the first support portion further includes a second sub-support portion, and at least one second sub-support portion is provided in the central region of each side of the substrate.

[0028] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, when a plurality of second sub-support portions are provided in the central region of each side of the substrate, the plurality of second sub-support portions are symmetrically arranged about the center point of the side of the substrate.

[0029] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the support layer includes a plurality of second support portions disposed at the gaps of the piezoelectric devices.

[0030] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the orthographic projection shape of the support layer on the substrate includes a square, triangle, circle, trapezoid, or polygon.

[0031] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the first support portion is a continuous ring structure.

[0032] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the material of the support layer includes at least one of the following: rubber, foam, and cotton foam.

[0033] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the material of the support layer includes polydimethylsiloxane.

[0034] Accordingly, this disclosure also provides a haptic feedback device, including the haptic feedback panel provided in the above-described embodiments of this disclosure. Attached Figure Description

[0035] Figure 1 A plan view of a haptic feedback panel provided in an embodiment of this disclosure;

[0036] Figure 2 for Figure 1 A schematic diagram of the cross-section along the CC' direction;

[0037] Figure 3 A plan view of yet another haptic feedback panel provided in an embodiment of this disclosure;

[0038] Figure 4 A plan view of yet another haptic feedback panel provided in an embodiment of this disclosure;

[0039] Figure 5 A plan view of yet another haptic feedback panel provided in an embodiment of this disclosure;

[0040] Figure 6 A plan view of yet another haptic feedback panel provided in an embodiment of this disclosure;

[0041] Figure 7 A plan view of yet another haptic feedback panel provided in an embodiment of this disclosure;

[0042] Figure 8 This is a schematic diagram of the structure of the piezoelectric device provided in the embodiments of this disclosure;

[0043] Figure 9 A schematic flowchart illustrating a driving method for a haptic feedback panel provided in an embodiment of this disclosure;

[0044] Figure 10 This is a schematic diagram of the partitioning of a substrate provided in an embodiment of the present disclosure;

[0045] Figures 11A-11E They are respectively Figure 10 Schematic diagram of the characteristic modal displacement field distribution corresponding to the five regions in the middle;

[0046] Figure 12 for Figure 11A A schematic diagram showing the partitioning of all piezoelectric devices on the corresponding substrate.

[0047] Figure 13A and Figure 13B for Figure 11B A schematic diagram showing the partitioning of all piezoelectric devices on the corresponding substrate.

[0048] Figure 14A and Figure 14B for Figure 11C A schematic diagram showing the partitioning of all piezoelectric devices on the corresponding substrate.

[0049] Figure 15A and Figure 15B for Figure 11D A schematic diagram showing the partitioning of all piezoelectric devices on the corresponding substrate.

[0050] Figure 16 for Figure 11E A schematic diagram showing the partitioning of all piezoelectric devices on the corresponding substrate. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Furthermore, the embodiments and features in the embodiments of this disclosure can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0052] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms as used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "inner," "outer," "upper," and "lower" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0053] It should be noted that the dimensions and shapes of the figures in the accompanying drawings do not reflect actual proportions and are intended only to illustrate the content of this disclosure. Furthermore, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0054] For vibration-based tactile reproduction devices, the working principle typically involves attaching a piezoelectric element, linear motor, or piezoelectric film to a substrate and applying pulse excitation to achieve touch functions such as virtual buttons. The linear motor approach has drawbacks. The linear motor is relatively large, significantly encroaching on the internal space of electronic products, reducing battery size and thus shortening battery life. The piezoelectric element approach requires a voltage amplification device, which not only takes up battery space but also poses a potential risk of electric shock due to the high voltage. The piezoelectric film approach, with a film thickness typically below 10μm, greatly reduces the device thickness, increases battery space, and improves overall battery life. Furthermore, using a piezoelectric film eliminates the need for high voltage, ensuring voltage safety. However, because the piezoelectric film is so thin, it is difficult to excite sufficient displacement in the substrate under isoelectric field conditions, thus hindering sufficient tactile feedback. Therefore, tactile reproduction devices using piezoelectric films generally utilize the characteristic frequency of the substrate to excite large displacements. However, tactile feedback generated by the characteristic frequency of the substrate can often only be concentrated in certain areas. This is mainly because the displacement field distribution of the substrate at the characteristic frequency is mainly concentrated in a specific area, making it difficult to achieve full-range tactile feedback.

[0055] In view of this, embodiments of this disclosure provide a method for driving a haptic feedback panel, including:

[0056] Receive touch signals and determine the user's touch position on the haptic feedback panel based on the touch signals;

[0057] The characteristic frequency region to which the touch position belongs is determined. The characteristic frequency region is one of the multiple characteristic frequency regions that are pre-divided into by the substrate of the haptic feedback panel according to the size of the substrate. The substrates corresponding to the same characteristic frequency region have the same characteristic frequency, and the substrates corresponding to different characteristic frequency regions have different characteristic frequencies.

[0058] The characteristic modal displacement field distribution of the substrate is determined based on the characteristic frequency region to which the touch position belongs. The characteristic modal displacement field distribution includes the vibration displacement phase information at each position of the substrate.

[0059] Based on the vibration displacement phase information of the characteristic modal displacement field distribution, the multiple piezoelectric devices arranged in an array contained in the haptic feedback panel are divided into at least one vibration region.

[0060] A voltage signal is applied to at least a portion of the piezoelectric devices within the vibration region; wherein the frequency of the voltage signal applied to all vibration regions is the same as the characteristic frequency of the substrate corresponding to the characteristic frequency region to which the determined touch position belongs, the phase of the voltage signal applied within the same vibration region is the same, and the phase of the voltage signal applied to two adjacent vibration regions is different.

[0061] The driving method for the haptic feedback panel provided in this embodiment first divides the substrate into multiple characteristic frequency regions. By detecting the touch position of the user (e.g., a finger) on the haptic feedback panel, the characteristic frequency region to which the touch position belongs is determined. Based on the characteristic mode displacement field distribution corresponding to the characteristic frequency region, all piezoelectric devices are divided into at least one vibration region. Then, at least a portion of the piezoelectric devices in each vibration region are loaded with a piezoelectric signal with the same frequency as the characteristic frequency of the substrate corresponding to the determined characteristic frequency region to which the touch position belongs. In this way, when the finger is in different touch positions, the piezoelectric devices can be used to excite different characteristic modes of the substrate, so that the finger can feel a strong haptic feedback effect at any position on the haptic feedback panel.

[0062] To better understand the driving method of the haptic feedback panel provided in the embodiments of this disclosure, the structure of the haptic feedback panel provided in the embodiments of this disclosure will be described below.

[0063] This disclosure provides an embodiment of a haptic feedback panel, such as... Figures 1-7 As shown, Figure 1 , Figures 3-7 Here are some schematic diagrams of different planar surfaces for haptic feedback panels. Figure 2 for Figure 1A cross-sectional schematic diagram along the CC' direction shows that the haptic feedback panel includes: a substrate 1, a plurality of piezoelectric devices 2 arranged in an array on one side of the substrate 1, and a touch layer 3 located on the side of the substrate 1 away from the piezoelectric devices 2; the piezoelectric devices 2 are configured to vibrate under the drive of a voltage signal to drive the substrate 1 to vibrate.

[0064] The tactile feedback panel provided in this embodiment of the invention, by adopting a structure integrating a substrate 1 and a touch layer 3, can realize touch functions (such as determining the touch position) and tactile reproduction functions.

[0065] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figures 1-7 As shown, the touch layer 3 is attached to the surface of the substrate 1 and provides the system with information such as the touch position during the touch process.

[0066] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figures 1-7 As shown, the piezoelectric device 2 can be a piezoelectric film or a piezoelectric sheet. A given voltage signal can directly provide vibration excitation, so that the tactile feedback panel produces a tactile feedback effect.

[0067] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figures 1-7 As shown, the substrate 1 is a substrate that comes into direct contact with tactile senses such as fingers, and can be a laptop touchpad, display screen, etc. Specifically, the substrate 1 can be a substrate made of glass, a substrate made of silicon or silicon dioxide (SiO2), a substrate made of sapphire, or a substrate made of metal wafers. There are no limitations here. Those skilled in the art can set the substrate according to the actual application needs.

[0068] like Figure 8 As shown, Figure 8 for Figures 1-7 A cross-sectional schematic diagram of a piezoelectric device 2 is shown. The piezoelectric device 2 includes a bottom electrode 21 and a top electrode 22 disposed opposite to each other, and a piezoelectric layer 23 located between the bottom electrode 21 and the top electrode 22. The piezoelectric device 2 may further include a bonding electrode 24 disposed on the same layer as the bottom electrode 21, the bonding electrode 24 being disposed near the edge of the substrate 1, and the bonding electrode 24 being used to connect to a driving voltage input terminal, the voltage signal input to the driving voltage input terminal being an AC voltage signal. The piezoelectric device 2 may also include an insulating layer 5 located on the side of the top electrode 22 facing away from the piezoelectric layer 23, and a wiring layer 6 located on the side of the insulating layer 5 facing away from the piezoelectric layer 23.

[0069] The insulating layer 25 has a first via V1 corresponding to the top electrode 22. One end of the trace layer 26 is electrically connected to the top electrode 22 through the first via V1, and the other end of the trace layer 26 is electrically connected to the bonding electrode 24 through a second via V2 penetrating the insulating layer 25. Specifically, the bottom electrode 21 is grounded, and the bonding electrode 24 is connected to the driving voltage input terminal. The voltage signal input to the driving voltage input terminal is an AC voltage signal, and an AC voltage signal (V) is applied to the top electrode 22 through the driving voltage input terminal. AC This creates an alternating electric field between the top electrode 22 and the bottom electrode 21, with the frequency of the alternating electric field being the same as the frequency of the alternating voltage signal. Under the action of the alternating electric field, the piezoelectric layer 23 deforms and generates a vibration signal with the same frequency as the alternating electric field. When the frequency of the vibration signal approaches or equals 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, a noticeable change in friction can be felt. In practical applications, the friction on the surface of the substrate 1 can be adjusted by the resonance generated between the piezoelectric layer 23 and the substrate 1, thereby achieving texture reproduction of objects on the surface of the substrate 1.

[0070] In this embodiment, the bottom electrode 21 and the bonding electrode 24 can be formed of the same material and using the same patterning process.

[0071] It should be noted that, Figure 1 , Figures 3-7 The bottom electrode 21 of all piezoelectric devices 2 can be a patterned structure or a solid surface structure; the piezoelectric layer 23 of all piezoelectric devices 2 can be a patterned structure or a solid surface structure; the top electrode 22 of all piezoelectric devices 2 is a patterned structure corresponding to the piezoelectric layer 22.

[0072] In practical implementation, the piezoelectric layer material can be lead zirconate titanate (Pb(Zr,Ti)O3, PZT), or it can be aluminum nitride (AlN), ZnO (zinc oxide), barium titanate (BaTiO3), lead titanate (PbTiO3), potassium niobate (KNbO3), lithium niobate (LiNbO3), lithium tantalate (LiTaO3), or lanthanum gallium silicate (La3Ga5SiO3). 14 At least one of the following can be used, and the specific material for making the piezoelectric layer can be selected according to the actual needs of those skilled in the art, without limitation. Among them, when using PZT to make the piezoelectric layer, since PZT has a high piezoelectric coefficient, it ensures the piezoelectric characteristics of the corresponding haptic feedback panel, and the corresponding haptic feedback panel can be applied to the haptic feedback device. Moreover, PZT has high light transmittance, so when it is integrated into the display device, it does not affect the display quality of the display device.

[0073] In specific implementation, the top and bottom electrodes of the piezoelectric device can be made of indium tin oxide (ITO), indium zinc oxide (IZO), or one of titanium-gold (Ti-Au) alloy, titanium-aluminum-titanium (Ti-Al-Ti) alloy, or 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), or chromium (Cr). Those skilled in the art can set the above electrodes according to the actual application needs, and no limitation is made here.

[0074] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figures 1-7 As shown, it also includes a support layer 4 located on the substrate 1, with the support layer 4 and the piezoelectric device 2 located on the same side of the substrate 1. Specifically, the support layer 31 mainly serves to connect the substrate 1 and the device. This device can be a support frame or a support plate. Specifically, this device mainly serves to support the haptic feedback panel, and can be the bezel of a display screen, the bezel of a laptop touchpad, etc. Specifically, the device and the support layer 31 can be fixedly connected by an adhesive layer (e.g., optical adhesive, OCA).

[0075] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figures 1-7 As shown, the material of the support layer 4 may include, but is not limited to, at least one of the following: rubber, foam, cotton foam, polydimethylsiloxane (PDMS).

[0076] Specifically, the support layer 4 and the substrate 1 can be fixedly connected by an adhesive layer (such as optical adhesive, OCA).

[0077] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 1 , Figures 3-5 , Figure 7 As shown, the support layer 4 may include a first support portion 41 located around the substrate 1 and surrounding all piezoelectric devices 2.

[0078] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 1 , Figures 3-5 As shown, the number of first support parts 41 can be multiple and they are independent of each other.

[0079] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 1 As shown, the first support portion 41 includes a first sub-support portion 411, which is disposed at the four corners of the substrate 1. The shape of the first sub-support portion 411 is L-shaped.

[0080] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 3 As shown, the first support portion 41 also includes a second sub-support portion 412, and at least one second sub-support portion 412 is provided in the central region of each side of the substrate 1.

[0081] It should be noted that, Figure 3 This illustration only shows that a second sub-support portion 412 is provided in the central area of ​​each side of the substrate 1. Of course, it is also possible to... Figure 1 On the basis of this, a second sub-support portion 412 is provided in the central region of each side of the substrate 1.

[0082] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 4 As shown, at least one second sub-support portion 412 may also be provided only in the central region of one set of oppositely arranged sides of the substrate 1, or... Figure 1 Based on the structure shown, at least one second sub-support portion 412 is provided in the central region of one of the oppositely arranged sides of the substrate 1.

[0083] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 5 As shown, when multiple second sub-support portions 412 are provided in the central region of each side of the substrate 1, the multiple second sub-support portions 412 are symmetrically arranged about the center point of the side of the substrate 1.

[0084] It should be noted that, Figure 5 This illustration simply shows that multiple second sub-support portions 412 are provided in the central area of ​​each side of the substrate 1. Of course, it is also possible to... Figure 1 On this basis, multiple second sub-support portions 412 are provided in the central region of each side of the substrate 1.

[0085] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 6 As shown, the support layer 4 includes a plurality of second support portions 42 disposed at the gap of the piezoelectric device 2.

[0086] It should be noted that, Figure 6 This illustration simply shows that multiple second support portions 42 are provided at the gap of the piezoelectric device 2. Of course, it is also possible to... Figure 1 , Figure 3 , Figure 4 or Figure 5 Based on this, multiple second support portions 42 are added at the gap of the piezoelectric device 2; or it can be in Figure 1 and Figure 3 Based on the stacked support layer 4 scheme, multiple second support portions 42 are added at the gaps of the piezoelectric devices 2, or in... Figure 1 and Figure 4 Based on the stacked support layer 4 scheme, multiple second support portions 42 are added at the gaps of the piezoelectric devices 2, or in... Figure 1 and Figure 5 Based on the superimposed support layer 4 scheme, multiple second support parts 42 are added at the gaps of the piezoelectric devices 2, etc.

[0087] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figures 3-6 As shown, the orthographic projection shape of the support layer 4 (second sub-support portion 412 and second support portion 42) on the substrate 1 includes a square shape; of course, the orthographic projection shape of each second sub-support portion 412 and second support portion 42 on the substrate 1 may also include a triangle, a circle, a trapezoid or a polygon.

[0088] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 7 As shown, the first support portion 41 can be a continuous annular structure. Optionally, the first support portion 41 can also be deformed at other locations as needed.

[0089] The vibration panel provided in this disclosure can be applied to fields such as medical, automotive electronics, and motion tracking systems. It is particularly suitable for wearable devices, external or implantable medical monitoring and treatment, or applications in fields such as artificial intelligence-based electronic skin. Specifically, the vibration panel can be applied to vibration panels that generate vibration and mechanical properties, such as brake pads, keyboards, mobile terminals, game controllers, automotive components, and smart home devices.

[0090] The following is based on Figure 3 Taking the haptic feedback panel shown as an example, the driving method of the haptic feedback panel provided in this embodiment will be described in detail.

[0091] This disclosure provides a method for driving a haptic feedback panel, such as... Figure 9 As shown, it includes:

[0092] S901: Receive touch signals and determine the user's touch position on the haptic feedback panel based on the touch signals;

[0093] S902. Determine the characteristic frequency region to which the touch position belongs. The characteristic frequency region is one of the multiple characteristic frequency regions that are pre-divided into based on the size of the substrate of the haptic feedback panel. Among them, the substrates corresponding to the same characteristic frequency region have the same characteristic frequency, and the substrates corresponding to different characteristic frequency regions have different characteristic frequencies.

[0094] S903. Determine the characteristic mode displacement field distribution of the substrate based on the characteristic frequency region to which the touch position belongs. The characteristic mode displacement field distribution includes vibration displacement phase information at each position of the substrate.

[0095] S904. Based on the vibration displacement phase information of the characteristic modal displacement field distribution, the multiple piezoelectric devices arranged in an array contained in the tactile feedback panel are divided into at least one vibration region.

[0096] S905. Apply voltage signals to at least a portion of the piezoelectric devices within the vibration region; wherein the frequency of the voltage signals applied to all vibration regions is the same as the characteristic frequency of the substrate corresponding to the characteristic frequency region to which the determined touch position belongs, the phase of the voltage signals applied within the same vibration region is the same, and the phase of the voltage signals applied to two adjacent vibration regions is different.

[0097] The driving method for the haptic feedback panel provided in this embodiment first divides the substrate into multiple characteristic frequency regions. By detecting the touch position of the user (e.g., a finger) on the haptic feedback panel, the characteristic frequency region to which the touch position belongs is determined. Based on the characteristic mode displacement field distribution corresponding to the characteristic frequency region, all piezoelectric devices are divided into at least one vibration region. Then, at least a portion of the piezoelectric devices in each vibration region are loaded with a piezoelectric signal with the same frequency as the characteristic frequency of the substrate corresponding to the determined characteristic frequency region to which the touch position belongs. In this way, when the finger is in different touch positions, the piezoelectric devices can be used to excite different characteristic modes of the substrate, so that the finger can feel a strong haptic feedback effect at any position on the haptic feedback panel.

[0098] In practical implementation, the substrate is divided into multiple characteristic frequency regions according to its size. This division can be based on the displacement field distribution of the substrate under different characteristic modes, which can be obtained through software fitting calculations or experiments. This embodiment takes a glass substrate with dimensions of 117mm * 61mm * 0.5mm as an example. This substrate can be divided into five characteristic frequency regions, such as... Figure 10 As shown, the five characteristic frequency regions are represented by the labels I, II, III, VI, and V, respectively. Substrate 1 corresponding to the same characteristic frequency region has the same characteristic frequency, while substrate 1 corresponding to different characteristic frequency regions has different characteristic frequencies; for example... Figures 11A-11E As shown, Figures 11A-11E They are respectively Figure 10 The characteristic modes of substrate 1 corresponding to the five characteristic frequency regions I, II, III, VI, and V are... Figures 11A-11E The middle arrow H points to the vibration displacement amplitude of substrate 1 from 0 to its maximum value.

[0099] In specific implementation, in the driving method provided in the embodiments of this disclosure, such as Figure 10 As shown, each characteristic frequency region has one or more regions. For example, there is one region I, four regions II, four regions III, two regions VI, and two regions V.

[0100] Specifically, Figure 10 The structure formed by the five characteristic frequency regions I, II, III, VI, and V and Figures 11A-11E The shape of the intermediate substrate 1 corresponds to that of the substrate.

[0101] Specifically, Figure 10 The five characteristic frequency regions, I, II, III, IV, and V, are respectively related to... Figures 11A-11E Corresponding to the vibration displacement field distribution in region I, the characteristic frequency of substrate 1 is 215 Hz. Figure 11A The vibration displacement phase information of the characteristic modal displacement field distribution of substrate 1 corresponding to region I is shown. When a 215Hz voltage signal is applied to the piezoelectric device on substrate 1 corresponding to region I, the vibration displacement amplitude distribution generated by substrate 1 is relatively large. The characteristic frequency of substrate 1 corresponding to region II is 261Hz. Figure 11B The vibration displacement phase information of the characteristic modal displacement field distribution of substrate 1 corresponding to region II is shown. When a 261Hz voltage signal is applied to the piezoelectric device on substrate 1 corresponding to region II, the vibration displacement amplitude distribution generated by substrate 1 is relatively large. The characteristic frequency of substrate 1 corresponding to region III is 574Hz. Figure 11C The vibration displacement phase information of the characteristic modal displacement field distribution of substrate 1 corresponding to region III is shown. When a 574Hz voltage signal is applied to the piezoelectric device on substrate 1 corresponding to region III, the vibration displacement amplitude distribution generated by substrate 1 is relatively large. The characteristic frequency of substrate 1 corresponding to region IV is 594Hz. Figure 11D The vibration displacement phase information of the characteristic modal displacement field distribution of substrate 1 corresponding to region IV is shown. When a 594Hz voltage signal is applied to the piezoelectric device on substrate 1 corresponding to region IV, the vibration displacement amplitude distribution generated by substrate 1 is relatively large. The characteristic frequency of substrate 1 corresponding to region V is 800Hz. Figure 11E The vibration displacement phase information of the characteristic modal displacement field distribution of substrate 1 corresponding to region V is given. When the piezoelectric device on substrate 1 corresponding to region V is loaded with an 800Hz voltage signal, the vibration displacement amplitude distribution generated by substrate 1 is relatively large.

[0102] It should be noted that, in this embodiment, a glass substrate of 117mm*61mm*0.5mm is used as an example for illustration. When the size of the substrate changes, the corresponding characteristic mode displacement field distribution also changes, and the partitioning of the substrate will also change. The specific partitioning should be based on the principle that the selected characteristic mode can generate sufficient tactile feedback effect in the entire range of the substrate.

[0103] In a specific implementation, in the driving method provided in the embodiments of this disclosure, step S804, which divides the array of piezoelectric devices included in the tactile feedback panel into at least one vibration region based on the vibration displacement phase information of the characteristic modal displacement field distribution, may specifically include:

[0104] When it is determined that the vibration displacement phase information at each location on the substrate has the same vibration displacement direction relative to the initial state of the substrate, all piezoelectric devices contained in the haptic feedback panel are divided into a vibration region. Specifically, as shown... Figure 11A and Figure 11E As shown, Figure 11A for Figure 10 The characteristic mode displacement field distribution of substrate 1 corresponding to region I. Figure 11E for Figure 10 The characteristic mode displacement field distribution of the substrate 1 corresponding to region V can be seen. Figure 11A and Figure 11E The characteristic modal displacement field distribution contains vibration displacement phase information at various locations on the substrate, which has the same vibration displacement direction relative to the initial state of substrate 1. Therefore, all piezoelectric devices included in the haptic feedback panel can be considered as a single vibration region; such as Figure 12 and Figure 16 As shown, Figure 12 for Figure 11A A schematic diagram showing the partitioning of all piezoelectric devices 2 on the corresponding substrate 1. Figure 16 for Figure 11E A schematic diagram of all the piezoelectric devices 2 on the corresponding substrate 1, when touched by a finger. Figure 3 When the haptic feedback panel shown is in use, if the electrical signal fed back through touch layer 3 detects that the finger is in a certain position... Figure 10 In region I, based on the characteristic modal displacement field distribution of the substrate 1 corresponding to region I, all piezoelectric devices on the substrate 1 are considered as a single vibration region. This allows for the analysis of… Figure 12 All piezoelectric devices 2 are loaded with voltage signals of the same amplitude and phase. Since the frequency of the voltage signal loaded by the piezoelectric device 2 is the same as the characteristic frequency (215Hz) of the substrate 1 corresponding to region I, the piezoelectric devices 1 on the substrate 1 can be excited by this voltage signal, thus generating strong tactile feedback in region I where the finger is located. When the finger touches... Figure 3When the haptic feedback panel shown is in use, if the electrical signal fed back through touch layer 3 detects that the finger is in a certain position... Figure 10 In region V, based on the characteristic modal displacement field distribution of the substrate 1 corresponding to region V, all piezoelectric devices on the substrate 1 are considered as a single vibration region. This allows for the analysis of… Figure 16 All piezoelectric devices 2 are loaded with voltage signals of the same amplitude and phase. Since the frequency of the voltage signal loaded by the piezoelectric device 2 is the same as the characteristic frequency (800Hz) of the substrate 1 corresponding to region V, when the piezoelectric device 2 on the substrate 1 is excited by the voltage signal, strong tactile feedback can be generated in region V where the finger is located.

[0105] In a specific implementation, in the driving method provided in the embodiments of this disclosure, step S804, which divides the array of piezoelectric devices included in the tactile feedback panel into at least one vibration region based on the vibration displacement phase information of the characteristic modal displacement field distribution, may specifically include:

[0106] When the vibration displacement phase information at various locations on the substrate is determined to have different vibration displacement directions relative to the initial state of the substrate, multiple piezoelectric devices corresponding to a continuous region formed by locations with the same vibration displacement direction are divided into a vibration region. Specifically, for example... Figures 11B-11D As shown, Figure 11B for Figure 10 The characteristic mode displacement field distribution of substrate 1 corresponding to region II. Figure 11C for Figure 10 Characteristic mode displacement field distribution of substrate 1 corresponding to region III. Figure 11D for Figure 10 The characteristic mode displacement field distribution of substrate 1 corresponding to region IV can be seen. Figures 11B-11D The characteristic modal displacement field distribution contains vibration displacement phase information at various locations on the substrate 1, which have different vibration displacement directions relative to the initial state of the substrate 1. Multiple piezoelectric devices 2 corresponding to a continuous region formed by locations with the same vibration displacement direction can be divided into a single vibration region, such as... Figures 13A-15B As shown, Figure 13A and Figure 13B for Figure 11B A schematic diagram showing the partitioning of all piezoelectric devices 2 on the corresponding substrate 1. Figure 14A and Figure 14B for Figure 11C A schematic diagram showing the partitioning of all piezoelectric devices 2 on the corresponding substrate 1. Figure 15A and Figure 15B for Figure 11D A schematic diagram of the partitioning of all piezoelectric devices 2 on the corresponding substrate 1.

[0107] When finger touches Figure 3When the haptic feedback panel shown is in use, if the electrical signal fed back through touch layer 3 detects that the finger is in a certain position... Figure 10 In region II, based on the characteristic modal displacement field distribution of the substrate 1 corresponding to region II, all piezoelectric devices 2 on the substrate 1 are divided into four vibration regions: A, B, C, and D. Figure 13A and Figure 13B A, B, C, and D correspond to ), respectively. Figure 11B The four arrows H point to the area, so that at least some piezoelectric devices 2 in each vibration area (A and D) with the same vibration displacement direction can be loaded with voltage signals with the same phase, and at least some piezoelectric devices 2 in each vibration area (B and C) with the same vibration displacement direction can be loaded with voltage signals with the same phase. The phase of the voltage signals loaded in B and C is 180° different from the phase of the voltage signals loaded in A and D.

[0108] When finger touches Figure 3 When the haptic feedback panel shown is in use, if the electrical signal fed back through touch layer 3 detects that the finger is in a certain position... Figure 10 In region III, based on the characteristic modal displacement field distribution of the substrate 1 corresponding to region III, all piezoelectric devices 2 on the substrate 1 are divided into six vibration regions: A, B, C, D, E, and F. Figure 14A and Figure 14B A, B, C, D, E, and F correspond to respectively Figure 11C The six arrows H point to the area, so that at least some of the piezoelectric devices 2 in each vibration area (A, C and E) with the same vibration displacement direction can be loaded with voltage signals with the same phase, and at least some of the piezoelectric devices 2 in each vibration area (B, D and F) with the same vibration displacement direction can be loaded with voltage signals with the same phase. The phase of the voltage signals loaded in B, D and F is 180° different from the phase of the voltage signals loaded in A, C and E.

[0109] When finger touches Figure 3 When the haptic feedback panel shown is in use, if the electrical signal fed back through touch layer 3 detects that the finger is in a certain position... Figure 10 In region IV, based on the characteristic modal displacement field distribution of the substrate 1 corresponding to region IV, all piezoelectric devices 2 on the substrate 1 are divided into two vibration regions, A and B. Figure 15A and Figure 15B A corresponds to Figure 11D The three arrows on the left side point to the area where H is located, and B corresponds to... Figure 11D The three arrows H on the right point to the area, so that at least some piezoelectric devices 2 in the vibration area A with the same vibration displacement direction can be loaded with voltage signals with the same phase, and at least some piezoelectric devices 2 in each vibration area B with the same vibration displacement direction can be loaded with voltage signals with the same phase. The phase of the voltage signal loaded in A is 180° different from the phase of the voltage signal loaded in B.

[0110] In specific implementation, in the driving method provided in the embodiments of this disclosure, such as Figure 13A , Figure 14A , Figure 15A As shown, a voltage signal with the same amplitude can be applied to all piezoelectric devices 2 in all vibration regions. Specifically, as... Figure 13A As shown, a voltage signal with amplitude Va is applied to all piezoelectric devices 2 in regions A and D, and a voltage signal with amplitude Vb is applied to all piezoelectric devices 3 in regions B and C. The frequencies of Va and Vb are the same as the characteristic frequency (261Hz) of the substrate 1 corresponding to region II, and Vb = -Va. That is, the phase of the voltage signals applied to B and C differs from the phase of the voltage signals applied to A and D by 180°. When Va is greater than a certain voltage V0, the characteristic mode corresponding to region II of the substrate 1 can be excited. Figure 11B At this time, the substrate 1 can generate sufficient tactile feedback in region II. Therefore, when the piezoelectric device 2 on the substrate 1 is excited by the voltage signal, strong tactile feedback can be generated in region II where the finger is located; for example Figure 14A As shown, a voltage signal with amplitude Va is applied to all piezoelectric devices 2 in regions A, C, and E, and a voltage signal with amplitude Vb is applied to all piezoelectric devices 3 in regions B, D, and F. The frequencies of Va and Vb are the same as the characteristic frequency (574 Hz) of the substrate 1 corresponding to region III, and Vb = -Va. That is, the phase of the voltage signals applied to B, D, and F differs from the phase of the voltage signals applied to A, C, and E by 180°. When Va is greater than a certain voltage V0, the characteristic mode corresponding to region III of the substrate 1 can be excited. Figure 11C At this time, the substrate 1 can generate sufficient tactile feedback in region III. Therefore, when the piezoelectric device 2 on the substrate 1 is excited by the voltage signal, strong tactile feedback can be generated in region III where the finger is located; for example Figure 15A As shown, a voltage signal with amplitude Va is applied to all piezoelectric devices 2 in region A, and a voltage signal with amplitude Vb is applied to all piezoelectric devices 3 in region B. The frequencies of Va and Vb are the same as the characteristic frequency (594Hz) of the substrate 1 corresponding to region N. Vb = -Va, meaning that the phase of the voltage signal applied in B is 180° out of phase with the phase of the voltage signal applied in A. When Va is greater than a certain voltage V0, the characteristic mode corresponding to region N of the substrate 1 can be excited. Figure 11D At this time, the substrate 1 can generate sufficient tactile feedback in region IV. Therefore, when the piezoelectric device 2 on the substrate 1 is excited by the voltage signal, strong tactile feedback can be generated in region IV where the finger is located.

[0111] In specific implementation, in the driving method provided in the embodiments of this disclosure, such as Figure 13B , Figure 14B , Figure 15B As shown, it can be done according to Figures 11B-11D The magnitude of the vibration displacement divides each vibration region into multiple sub-regions, each sub-region corresponding to a different vibration displacement amplitude; for example, ... Figure 13B As shown, vibration region A is divided into multiple sub-regions (A1, A2, ...), with the vibration displacement amplitudes corresponding to A1, A2, ... gradually decreasing; vibration region B is divided into multiple sub-regions (B1, B2, ...), with the vibration displacement amplitudes corresponding to B1, B2, ... gradually decreasing; vibration region C is divided into multiple sub-regions (C1, C2, ...), with the vibration displacement amplitudes corresponding to C1, C2, ... gradually decreasing; vibration region D is divided into multiple sub-regions (D1, D2, ...), with the vibration displacement amplitudes corresponding to D1, D2, ... gradually decreasing; as... Figure 14B As shown, vibration region A is divided into multiple sub-regions (A1, A2, ...), with the vibration displacement amplitudes of A1, A2, ... gradually decreasing; vibration region B is divided into multiple sub-regions (B1, B2, ...), with the vibration displacement amplitudes of B1, B2, ... gradually decreasing; vibration region C is divided into multiple sub-regions (C1, C2, ...), with the vibration displacement amplitudes of C1, C2, ... gradually decreasing; vibration region D is divided into multiple sub-regions (D1, D2, ...), with the vibration displacement amplitudes of D1, D2, ... gradually decreasing; vibration region E is divided into multiple sub-regions (E1, E2, ...), with the vibration displacement amplitudes of E1, E2, ... gradually decreasing; vibration region F is divided into multiple sub-regions (F1, F2, ...), with the vibration displacement amplitudes of F1, F2, ... gradually decreasing; as... Figure 15B As shown, vibration region A is divided into multiple sub-regions (A1, A2, ...), and the vibration displacement amplitudes corresponding to A1, A2, ... gradually decrease; vibration region B is divided into multiple sub-regions (B1, B2, ...), and the vibration displacement amplitudes corresponding to B1, B2, ... gradually decrease.

[0112] Can be Figure 13B , Figure 14B and Figure 15B Applying a voltage signal to the sub-region with the largest vibration displacement amplitude in each vibration region can excite the corresponding region of substrate 1. Figure 11B , Figure 11C and Figure 11D The characteristic modes of the substrate 1 can generate sufficient tactile feedback in the corresponding area, and the voltage signal is only applied to the sub-region with the largest vibration displacement amplitude in each vibration region, which can reduce power consumption.

[0113] For example, such as Figure 13BAs shown, a voltage signal with amplitude Va1 is applied to piezoelectric device 2 in sub-region A1 with the largest vibration displacement amplitude in vibration region A; a voltage signal with amplitude Vb1 is applied to piezoelectric device 2 in sub-region B1 with the largest vibration displacement amplitude in vibration region B; a voltage signal with amplitude Vb1 is applied to piezoelectric device 2 in sub-region C1 with the largest vibration displacement amplitude in vibration region C; and a voltage signal with amplitude Va1 is applied to piezoelectric device 2 in sub-region D1 with the largest vibration displacement amplitude in vibration region D. The frequencies of Va1 and Vb1 are the same as the characteristic frequency (261Hz) of substrate 1 corresponding to region II, and Vb1 = -Va1. That is, the phase of the voltage signals applied to A1 and D1 differs from the phase of the voltage signals applied to B1 and C1 by 180°. When Va is greater than a certain voltage V0, the characteristic mode corresponding to region II of substrate 1 can be excited. Figure 11B At this time, the substrate 1 can generate sufficient tactile feedback effect in region II.

[0114] like Figure 14B As shown, a voltage signal with amplitude Va1 is applied to piezoelectric device 2 in sub-region A1 of vibration region A, where the vibration displacement amplitude is the largest; a voltage signal with amplitude Vb1 is applied to piezoelectric device 2 in sub-region B1 of vibration region B, where the vibration displacement amplitude is the largest; a voltage signal with amplitude Va1 is applied to piezoelectric device 2 in sub-region C1 of vibration region C, where the vibration displacement amplitude is the largest; a voltage signal with amplitude Vb1 is applied to piezoelectric device 2 in sub-region D1 of vibration region D, where the vibration displacement amplitude is the largest; and a voltage signal with amplitude Vb1 is applied to piezoelectric device 2 in sub-region E, where the vibration displacement amplitude is the largest. A voltage signal with amplitude Va1 is applied to piezoelectric device 2 within E1. A voltage signal with amplitude Vb1 is applied to piezoelectric device 2 within sub-region F1, which has the largest vibration displacement amplitude in vibration region F. The frequencies of Va1 and Vb1 are the same as the characteristic frequency (574Hz) of substrate 1 corresponding to region III. Vb1 = -Va1, meaning that the phase of the voltage signals applied by A1, C1, and E1 differs from the phase of the voltage signals applied by B1, D1, and F1 by 180°. When Va is greater than a certain voltage V0, it can excite the characteristic mode corresponding to region III of substrate 1. Figure 11C At this time, the substrate 1 can generate sufficient tactile feedback effect in region III.

[0115] like Figure 15BAs shown, a voltage signal with amplitude Va1 is applied to piezoelectric device 2 in sub-region A1 of vibration region A, where the vibration displacement amplitude is the largest. A voltage signal with amplitude Vb1 is applied to piezoelectric device 2 in sub-region B1 of vibration region B, where the vibration displacement amplitude is the largest. The frequencies of Va1 and Vb1 are the same as the characteristic frequency (594Hz) of substrate 1 corresponding to region IV. Vb1 = -Va1, meaning the phase of the voltage signal applied to A1 differs from the phase of the voltage signal applied to B1 by 180°. When Va is greater than a certain voltage V0, it can excite the characteristic mode corresponding to region IV of substrate 1. Figure 11D At this time, the substrate 1 can generate sufficient tactile feedback in region IV.

[0116] The above describes applying a voltage signal only to the sub-region with the largest vibration displacement amplitude in each vibration region. Of course, the same voltage signal can also be applied to the sub-regions with the largest and second largest vibration displacement amplitudes in each vibration region, for example... Figure 13B As shown, a voltage signal with amplitude Va1 is applied to piezoelectric devices 2 in sub-regions A1 and A2 with the largest and second largest vibration displacement amplitudes in vibration region A; a voltage signal with amplitude Vb1 is applied to piezoelectric devices 2 in sub-regions B1 and B2 with the largest and second largest vibration displacement amplitudes in vibration region B; a voltage signal with amplitude Vb1 is applied to piezoelectric devices 2 in sub-regions C1 and C2 with the largest and second largest vibration displacement amplitudes in vibration region C; and a voltage signal with amplitude Va1 is applied to piezoelectric devices 2 in sub-regions D1 and D2 with the largest and second largest vibration displacement amplitudes in vibration region D. The frequencies of Va1 and Vb1 are the same as the characteristic frequency (261Hz) of the substrate 1 corresponding to region II, and Vb1 = -Va1. That is, the phase of the voltage signals applied to A1 and D1 differs from the phase of the voltage signals applied to B1 and C1 by 180°. When Va is greater than a certain voltage V0, the characteristic mode corresponding to region II of the substrate 1 can be excited. Figure 11B At this time, the substrate 1 can generate sufficient tactile feedback effect in region II.

[0117] like Figure 14BAs shown, a voltage signal with amplitude Va1 is applied to piezoelectric devices 2 in sub-regions A1 and A2 with the largest and second largest vibration displacement amplitudes in vibration region A; a voltage signal with amplitude Vb1 is applied to piezoelectric devices 2 in sub-regions B1 and B2 with the largest and second largest vibration displacement amplitudes in vibration region B; a voltage signal with amplitude Va1 is applied to piezoelectric devices 2 in sub-regions C1 and C2 with the largest and second largest vibration displacement amplitudes in vibration region C; a voltage signal with amplitude Vb1 is applied to piezoelectric devices 2 in sub-regions D1 and D2 with the largest and second largest vibration displacement amplitudes in vibration region D; and a voltage signal with amplitude Vb1 is applied to piezoelectric devices 2 in sub-regions E with the largest vibration displacement amplitudes in vibration region A1 and A2. A voltage signal with amplitude Va1 is applied to piezoelectric devices 2 in sub-regions E1 and E2, and a voltage signal with amplitude Vb1 is applied to piezoelectric devices 2 in sub-regions F1 and F2, which have the largest vibration displacement amplitude in vibration region F. The frequencies of Va1 and Vb1 are the same as the characteristic frequency (574Hz) of the substrate 1 corresponding to region III, and Vb1 = -Va1. That is, the phase of the voltage signals applied by A1, A2, C1, C2, E1, and E2 is 180° out of phase with the phase of the voltage signals applied by B1, B1, D1, D1, F1, and F2. When Va is greater than a certain voltage V0, the characteristic mode corresponding to region III of the substrate 1 can be excited. Figure 11C At this time, the substrate 1 can generate sufficient tactile feedback effect in region III.

[0118] like Figure 15B As shown, a voltage signal with amplitude Va1 is applied to piezoelectric devices 2 in sub-regions A1 and A2 with the largest and second largest vibration displacement amplitudes in vibration region A. A voltage signal with amplitude Vb1 is applied to piezoelectric devices 2 in sub-regions B1 and B2 with the largest and second largest vibration displacement amplitudes in vibration region B. The frequencies of Va1 and Vb1 are the same as the characteristic frequency (594Hz) of the substrate 1 corresponding to region IV. Vb1 = -Va1, that is, the phase of the voltage signals applied to A1 and A2 differs from the phase of the voltage signals applied to B1 and B2 by 180°. When Va is greater than a certain voltage V0, the characteristic mode corresponding to region IV of the substrate 1 can be excited. Figure 11D At this time, the substrate 1 can generate sufficient tactile feedback in region IV.

[0119] In practical implementation, since a correspondingly larger voltage signal needs to be applied to areas with large vibration displacement amplitudes to achieve strong tactile feedback, the driving method provided in the embodiments of this disclosure, such as Figure 13B , Figure 14B , Figure 15B As shown, voltage signals with different amplitudes can be applied to each sub-region within a vibration region according to the vibration displacement amplitude; for example, as Figure 13BAs shown, within vibration region A, voltage signals with different amplitudes are applied to sub-regions A1, A2... according to the vibration displacement amplitude; within vibration region B, voltage signals with different amplitudes are applied to sub-regions B1, B2... according to the vibration displacement amplitude; within vibration region C, voltage signals with different amplitudes are applied to sub-regions C1, C2... according to the vibration displacement amplitude; and within vibration region D, voltage signals with different amplitudes are applied to sub-regions D1, D2... according to the vibration displacement amplitude. Figure 14B As shown, within vibration region A, voltage signals with different amplitudes are applied to sub-regions A1, A2... according to the vibration displacement amplitude; within vibration region B, voltage signals with different amplitudes are applied to sub-regions B1, B2... according to the vibration displacement amplitude; within vibration region C, voltage signals with different amplitudes are applied to sub-regions C1, C2... according to the vibration displacement amplitude; within vibration region D, voltage signals with different amplitudes are applied to sub-regions D1, D2... according to the vibration displacement amplitude; within vibration region E, voltage signals with different amplitudes are applied to sub-regions E1, E2... according to the vibration displacement amplitude; and within vibration region F, voltage signals with different amplitudes are applied to sub-regions F1, F2... according to the vibration displacement amplitude. Figure 15B As shown, within vibration region A, voltage signals with different amplitudes are applied to sub-regions A1, A2, ... according to the vibration displacement amplitude; within vibration region B, voltage signals with different amplitudes are applied to sub-regions B1, B2, ... according to the vibration displacement amplitude.

[0120] In specific implementation, in the driving method provided in the embodiments of this disclosure, such as Figure 13B , Figure 14B , Figure 15B As shown, voltage signals with progressively decreasing voltage amplitudes are applied from the sub-region with the largest vibration displacement amplitude to the sub-region with the smallest vibration displacement amplitude.

[0121] For example, such as Figure 13BAs shown, voltage signals with progressively decreasing amplitudes are applied from sub-region A1 (maximum vibration displacement amplitude) to sub-region B1 (maximum vibration displacement amplitude) to sub-region C1 (maximum vibration displacement amplitude) to sub-region D1 (maximum vibration displacement amplitude) to sub-region D2 (maximum vibration displacement amplitude) to sub-region D1 (maximum vibration displacement amplitude) to sub-region D2 (maximum vibration displacement amplitude). For example, a voltage signal with an amplitude of Va1 is applied to piezoelectric device 2 within sub-regions A1 and D1. A voltage signal with amplitude Va2 is applied to piezoelectric devices 2 in sub-regions A2 and D2, and a voltage signal with amplitude Vb1 is applied to piezoelectric devices 2 in sub-regions B1 and C1, and a voltage signal with amplitude Vb2 is applied to piezoelectric devices 2 in sub-regions B2 and C2. Va1 > Va2, Vb1 = -Va1, Vb2 = -Va2, that is, the voltage signals in regions B1 and C1 are 180° out of phase with those in regions A1 and D1, and the voltage signals in regions B2 and C2 are 180° out of phase with those in regions A2 and D2. When Va1 is greater than a certain voltage V1 and Va2 is greater than a certain voltage V2, and the frequency of the voltage signal is the same as the characteristic frequency (261Hz) of the substrate 1 corresponding to region II, the characteristic mode corresponding to region II of the substrate 1 can be excited. Figure 11B At this time, the substrate 1 can generate sufficient tactile feedback in region II;

[0122] like Figure 14BAs shown, voltage signals with progressively decreasing amplitudes are applied along the sub-regions A1, A2, etc., from the sub-region with the largest vibration displacement amplitude to the sub-region with the smallest vibration displacement amplitude; along the sub-regions B1, B2, etc., from the sub-region with the largest vibration displacement amplitude to the sub-region with the smallest vibration displacement amplitude; along the sub-regions C1, C2, etc., from the sub-region with the largest vibration displacement amplitude to the sub-region with the smallest vibration displacement amplitude; along the sub-regions D1, D2, etc., from the sub-region with the largest vibration displacement amplitude to the sub-region with the smallest vibration displacement amplitude; along the sub-regions E1, E2, etc., from the sub-region with the largest vibration displacement amplitude to the sub-region with the smallest vibration displacement amplitude; along the sub-regions F1, F2, etc., from the sub-region with the largest vibration displacement amplitude to the sub-region with the smallest vibration displacement amplitude; and along the sub-regions F1, F2, etc., from the sub-region with the largest vibration displacement amplitude to the sub-region with the smallest vibration displacement amplitude. A voltage signal with progressively decreasing amplitude. For example, piezoelectric device 2 in sub-regions A1, C1, and E1 applies a voltage signal with amplitude Va1; piezoelectric device 2 in sub-regions A2, C2, and E2 applies a voltage signal with amplitude Va2; piezoelectric device 2 in sub-regions B1, D1, and F1 applies a voltage signal with amplitude Vb1; and piezoelectric device 2 in sub-regions B2, D2, and F2 applies a voltage signal with amplitude Vb2. Va1 > Va2, Vb1 = -Va1. Vb2 = -Va2, meaning the voltage signals in regions A1, C1, E1 are 180° out of phase with those in regions B1, D1, F1, and regions A2, C2, E2 are 180° out of phase with those in regions B2, D2, F2. When Va1 is greater than a certain voltage V1 and Va2 is greater than a certain voltage V2, and the voltage signal frequency is the same as the characteristic frequency (574Hz) of the substrate 1 corresponding to region III, the characteristic mode corresponding to region III of the substrate 1 can be excited. Figure 11C At this time, the substrate 1 can generate sufficient tactile feedback effect in region III.

[0123] like Figure 15BAs shown, voltage signals with progressively decreasing amplitudes are applied from sub-region A1 (maximum vibration displacement amplitude) to sub-region B1 (maximum vibration displacement amplitude) to sub-region B2 (maximum vibration displacement amplitude). For example, piezoelectric device 2 in sub-region A1 applies a voltage signal with amplitude Va1, piezoelectric device 2 in sub-region A2 applies a voltage signal with amplitude Va2, and piezoelectric device 2 in sub-region B1 applies a voltage signal with amplitude Va2. A voltage signal of amplitude Vb1 is applied to piezoelectric device 2 in sub-region B2, where Va1 > Va2, Vb1 = -Va1, and Vb2 = -Va2. This means the voltage signals in regions B1 and A1 are 180° out of phase, and the voltage signals in regions B2 and A2 are also 180° out of phase. When Va1 is greater than a certain voltage V1 and Va2 is greater than a certain voltage V2, and the frequency of the voltage signals is the same as the characteristic frequency (594Hz) of the substrate 1 corresponding to region N, the characteristic mode corresponding to region N of the substrate 1 can be excited. Figure 11D At this time, the substrate 1 can generate sufficient tactile feedback in region IV.

[0124] In summary, the embodiments of this disclosure achieve a strong tactile feedback effect by utilizing the resonance generated at a characteristic frequency by the substrate. By partitioning the piezoelectric devices, the piezoelectric devices are controlled in sections. When a signal activating tactile feedback is detected, a corresponding characteristic mode capable of generating sufficient tactile feedback is selected according to the touch position of the finger. A voltage signal with a certain phase difference is applied to the piezoelectric devices in different areas to excite the corresponding characteristic modes, thereby generating a strong tactile feedback effect in the area where the finger is located.

[0125] Based on the same inventive concept, this disclosure also provides a haptic feedback device, including the haptic feedback panel described above. Since the principle by which this haptic feedback device solves the problem is similar to that of the aforementioned haptic feedback panel, the implementation of this haptic feedback device can refer to the implementation of the aforementioned haptic feedback panel, and repeated details will not be elaborated further. This haptic feedback device can be any product or component with display or touch functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0126] In specific implementations, the tactile feedback device provided in the embodiments of this disclosure may also include other membrane layers known to those skilled in the art, which will not be described in detail here.

[0127] In practical implementation, haptic feedback devices can determine the location of human touch, thereby generating corresponding vibration waveforms, amplitudes, and frequencies, enabling human-computer interaction. Of course, haptic feedback devices can also be applied in fields such as medicine, automotive electronics, and motion tracking systems, depending on actual needs, which will not be detailed here.

[0128] This disclosure provides a haptic feedback panel, its driving method, and a haptic feedback device. First, a substrate is divided into multiple characteristic frequency regions. By detecting the touch position of a user (e.g., a finger) on the haptic feedback panel, the characteristic frequency region to which the touch position belongs is determined. Based on the characteristic mode displacement field distribution corresponding to the characteristic frequency region, all piezoelectric devices are divided into at least one vibration region. Then, at least a portion of the piezoelectric devices in each vibration region are loaded with a piezoelectric signal with the same frequency as the characteristic frequency of the substrate corresponding to the determined characteristic frequency region to which the touch position belongs. In this way, when the finger is in different touch positions, the piezoelectric devices can be used to excite different characteristic modes of the substrate, so that the finger can feel a strong haptic feedback effect at any position on the haptic feedback panel.

[0129] Although preferred embodiments of this disclosure have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this disclosure.

[0130] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this disclosure without departing from the spirit and scope of the embodiments of this disclosure. Therefore, if these modifications and variations to the embodiments of this disclosure fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include these modifications and variations.

Claims

1. A method for driving a haptic feedback panel, wherein, include: Receive touch signals and determine the user's touch position on the haptic feedback panel based on the touch signals; The characteristic frequency region to which the touch position belongs is determined. The characteristic frequency region is one of a variety of characteristic frequency regions that are pre-divided into by the substrate of the haptic feedback panel according to the size of the substrate. The substrates corresponding to the same characteristic frequency region have the same characteristic frequency, and the substrates corresponding to different characteristic frequency regions have different characteristic frequencies. The characteristic modal displacement field distribution of the substrate is determined based on the characteristic frequency region to which the touch position belongs, and the characteristic modal displacement field distribution includes vibration displacement phase information at each position of the substrate. Based on the vibration displacement phase information of the characteristic modal displacement field distribution, the array of multiple piezoelectric devices contained in the tactile feedback panel is divided into at least one vibration region. A voltage signal is applied to at least a portion of the piezoelectric devices within the vibration region; wherein the frequency of the voltage signal applied to all the vibration regions is the same as the characteristic frequency of the substrate corresponding to the characteristic frequency region to which the determined touch position belongs, the voltage signal applied within the same vibration region has the same phase, and the voltage signals applied to two adjacent vibration regions have different phases.

2. The driving method as described in claim 1, wherein, Based on the vibration displacement phase information of the characteristic modal displacement field distribution, the array of piezoelectric devices included in the tactile feedback panel is divided into at least one vibration region, specifically including: When it is determined that the vibration displacement phase information at each position of the substrate has the same vibration displacement direction relative to the initial state of the substrate, all piezoelectric devices contained in the haptic feedback panel are divided into a vibration region.

3. The driving method as described in claim 2, wherein, Applying voltage signals to at least a portion of the piezoelectric devices within the vibration region specifically includes applying voltage signals with the same amplitude and phase to all piezoelectric devices within the vibration region.

4. The driving method as described in claim 1, wherein, Based on the vibration displacement phase information of the characteristic modal displacement field distribution, the array of piezoelectric devices included in the tactile feedback panel is divided into at least one vibration region, specifically including: When it is determined that the vibration displacement phase information at each position of the substrate has different vibration displacement directions relative to the initial state of the substrate, multiple piezoelectric devices corresponding to the continuous region formed by the positions with the same vibration displacement direction are divided into a vibration region.

5. The driving method as described in claim 4, wherein, Applying voltage signals to at least a portion of the piezoelectric devices within the vibration region specifically includes: applying voltage signals with the same phase to at least a portion of the piezoelectric devices within each vibration region with the same vibration displacement direction, and applying voltage signals with a phase difference of 180° to at least a portion of the piezoelectric devices within each vibration region with different vibration displacement directions.

6. The driving method as described in claim 5, wherein, A voltage signal with the same amplitude is applied to all piezoelectric devices in all vibration regions.

7. The driving method as described in claim 5, wherein, Each vibration region is divided into multiple sub-regions according to the magnitude of the vibration displacement, and each sub-region corresponds to a different vibration displacement amplitude. A voltage signal is applied to the sub-region with the largest vibration displacement amplitude in each of the vibration regions.

8. The driving method as described in claim 5, wherein, Each vibration region is divided into multiple sub-regions according to the magnitude of the vibration displacement, and each sub-region corresponds to a different vibration displacement amplitude. Within a vibration region, voltage signals with different amplitudes are applied to each sub-region according to the vibration displacement amplitude.

9. The driving method as described in claim 8, wherein, A voltage signal with progressively decreasing voltage amplitude is applied from the sub-region with the largest vibration displacement amplitude to the sub-region with the smallest vibration displacement amplitude.

10. A haptic feedback panel, wherein the haptic feedback panel is driven by the driving method according to any one of claims 1-9, wherein, The haptic feedback panel includes: a substrate, a plurality of piezoelectric devices arranged in an array on one side of the substrate, and a touch layer on the side of the substrate opposite to the piezoelectric devices; the piezoelectric devices are configured to vibrate under the drive of a voltage signal to drive the substrate to vibrate.

11. The haptic feedback panel as claimed in claim 10, wherein, It also includes a support layer located on the substrate, the support layer being located on the same side of the substrate as the piezoelectric device.

12. The haptic feedback panel as claimed in claim 11, wherein, The support layer includes a first support portion located around the substrate and surrounding all the piezoelectric devices.

13. The haptic feedback panel as claimed in claim 12, wherein, The number of the first support parts is multiple and they are independent of each other.

14. The haptic feedback panel as claimed in claim 13, wherein, The first support portion includes a first sub-support portion, which is disposed at the four corners of the substrate, and the first sub-support portion is L-shaped.

15. The haptic feedback panel as claimed in claim 13 or 14, wherein, The first support portion further includes a second sub-support portion, and at least one second sub-support portion is provided in the central region of each side of the substrate.

16. The haptic feedback panel as claimed in claim 15, wherein, When multiple second sub-support portions are provided in the central region of each side of the substrate, the multiple second sub-support portions are symmetrically arranged about the center point of the side of the substrate.

17. The haptic feedback panel as claimed in any one of claims 11-16, wherein, The support layer includes a plurality of second support portions disposed at the gaps of the piezoelectric devices.

18. The haptic feedback panel as described in any one of claims 15-17, wherein, The orthographic projection shape of the support layer on the substrate includes square, triangular, circular, trapezoidal or polygonal shapes.

19. The haptic feedback panel as claimed in claim 12, wherein, The first support portion is a continuous ring structure.

20. The haptic feedback panel as claimed in any one of claims 11-19, wherein, The material of the support layer includes at least one of the following: rubber, foam, or cotton foam.

21. The haptic feedback panel as claimed in any one of claims 11-19, wherein, The material of the support layer includes polydimethylsiloxane.

22. A haptic feedback device, wherein, Including the haptic feedback panel as described in any one of claims 10-21.

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