Haptic feedback panel, haptic feedback method thereof, and haptic feedback device

Abstract

A kind of tactile feedback panel, its tactile feedback method and tactile feedback device, the tactile feedback panel includes: touch substrate (1);At least one piezoelectric device (2), located in one side of touch substrate (1), piezoelectric device (2) is configured to vibrate under the action of different resonant frequency alternating electric field, and drive touch substrate (1) to generate vibration and emit vibration sound.

Description

Technical Field

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

[0002] Haptic feedback is one of the important methods of human-computer interaction. Compared with mature audiovisual interaction technologies, haptic feedback is in a stage of rapid development. Specifically, haptic feedback can reproduce the texture of materials and shapes, as well as provide haptic feedback through vibration. Integrating haptic feedback into a terminal can provide realism and immersion in human-computer interaction. Summary of the Invention

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

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

[0005] Touch board;

[0006] At least one piezoelectric device is located on one side of the touch substrate. The piezoelectric device is configured to vibrate under the action of an alternating electric field with different resonant frequencies, and drive the touch substrate to vibrate and emit vibration sound.

[0007] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the piezoelectric device includes a first electrode, a piezoelectric layer, and a second electrode stacked sequentially; the first electrode is close to the touch substrate and is grounded, while the second electrode is electrically connected to a driving voltage input terminal; wherein...

[0008] The first electrode and the second electrode are configured to form the alternating electric field, and the piezoelectric layer is configured to vibrate under the action of the alternating electric field, thereby driving the touch substrate to vibrate and emit a vibration sound.

[0009] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the driving voltage corresponding to the vibration sound that drives the touch substrate to emit a periodic vibration satisfies the following relationship:

[0010] Y=(sin(2*π*0.5*t))*(0.5-0.5*cos(2*π*fe*t))*sin(2*π*fc*t);

[0011] Where Y is the driving voltage, fc is the carrier frequency, fe is the envelope frequency, and t is the vibration time.

[0012] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the driving voltage input to the driving voltage input terminal corresponding to the vibration sound that drives the touch substrate to emit a tapping vibration sensation satisfies the following relationship:

[0013] Y=exp(-1*β*t)*sin(2*π*fc*t);

[0014] Where Y is the driving voltage, β is the inversion attenuation coefficient, fc is the carrier frequency, and t is the vibration time.

[0015] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, fc is 500Hz to 800Hz.

[0016] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the azimuth angle of the sound source emitting the vibration sound is greater than 60°.

[0017] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, there are multiple piezoelectric devices, and a row of piezoelectric devices is provided on each of the two oppositely arranged sides of the touch substrate.

[0018] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, each of the piezoelectric devices is arranged in series or in parallel.

[0019] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the gap between adjacent piezoelectric devices is less than 1 mm, and the thickness of the piezoelectric device is less than the thickness of the touch substrate.

[0020] In one possible implementation, the haptic feedback panel provided in the embodiments of this disclosure further includes an explosion-proof film layer located on the side of the touch substrate away from the piezoelectric device, wherein the transmittance of the explosion-proof film layer is greater than 90%.

[0021] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the thickness of the piezoelectric layer is 500nm to 2000nm.

[0022] In one possible implementation, in the haptic feedback panel provided in the embodiments of this disclosure, the piezoelectric layer includes at least one of lead zirconate titanate, aluminum nitride, zinc oxide, barium titanate, lead titanate, potassium niobate, lithium niobate, lithium tantalate, and lanthanum gallium silicate.

[0023] Accordingly, this disclosure also provides a haptic feedback device, including: a haptic feedback panel as described in any of the preceding claims, and a display substrate on the side of the haptic feedback panel where a piezoelectric device is located away from the touch substrate.

[0024] In one possible implementation, in the haptic feedback device provided in the embodiments of this disclosure, the display substrate includes a display area and a peripheral area located around the display area, and the orthographic projection of the piezoelectric device on the display substrate is located within the peripheral area.

[0025] In one possible implementation, the haptic feedback device provided in the embodiments of this disclosure further includes a foam layer located between the piezoelectric device and the display substrate, wherein the width of the foam layer is smaller than the width of the piezoelectric device.

[0026] In one possible implementation, the haptic feedback device provided in this embodiment further includes a housing layer for fixing the haptic feedback panel and the display substrate. The housing layer includes: a first shielding portion fixed to the side of the haptic feedback panel opposite to the display substrate, and a second shielding portion fixed to the side of the haptic feedback panel and the display substrate; the first shielding portion and the second shielding portion are an integral structure; wherein...

[0027] The orthographic projection of the piezoelectric device on the display substrate is located within the orthographic projection range of the first shielding portion on the display substrate, and the orthographic projection of the foam layer on the display substrate is located within the orthographic projection range of the piezoelectric device on the display substrate.

[0028] Accordingly, this disclosure also provides a haptic feedback method for driving the haptic feedback panel described in any of the above claims, comprising:

[0029] When an alternating electric field with different resonant frequencies is applied to the piezoelectric device, the piezoelectric device vibrates under the action of the alternating electric field, which in turn drives the touch substrate to vibrate and emit vibration sound.

[0030] In one possible implementation, in the tactile feedback method provided in this embodiment of the present disclosure, a ground signal is applied to the first electrode of the piezoelectric device, and a driving voltage corresponding to the vibration sound that drives the touch substrate to emit a periodic vibration is applied to the second electrode of the piezoelectric device. The driving voltage satisfies the following relationship:

[0031] Y=(sin(2*π*0.5*t))*(0.5-0.5*cos(2*π*fe*t))*sin(2*π*fc*t);

[0032] Where Y is the driving voltage, fc is the carrier frequency, fe is the envelope frequency, and t is the vibration time.

[0033] In one possible implementation, in the tactile feedback method provided in this embodiment of the present disclosure, a ground signal is applied to the first electrode of the piezoelectric device, and a driving voltage corresponding to the vibration sound that drives the touch substrate to emit a tapping vibration is applied to the second electrode of the piezoelectric device. The driving voltage satisfies the following relationship:

[0034] Y=exp(-1*β*t)*sin(2*π*fc*t);

[0035] Where Y is the driving voltage, β is the inversion attenuation coefficient, fc is the carrier frequency, and t is the vibration time. Attached Figure Description

[0036] Figure 1 A schematic diagram of the planar structure of a haptic feedback panel provided in an embodiment of this disclosure;

[0037] Figure 2 for Figure 1 A schematic diagram of the cross section along the AA' direction;

[0038] Figure 3 for Figure 1 A schematic diagram of the cross-section along the CC' direction;

[0039] Figure 4 This is a schematic diagram of the structure of the piezoelectric device provided in the embodiments of this disclosure;

[0040] Figure 5A This is a schematic diagram showing the amplitude generated when a piezoelectric device vibrates under the action of an alternating electric field at different frequencies;

[0041] Figure 5B This is a schematic diagram showing the acceleration generated when a piezoelectric device vibrates under the action of an alternating electric field at different frequencies.

[0042] Figure 6A This is a schematic diagram simulating the vibration of a piezoelectric device at low frequencies (<1000Hz).

[0043] Figure 6B This is a schematic diagram simulating the standing wave vibration of a piezoelectric device at high frequencies (>20kHz).

[0044] Figure 7A A schematic diagram showing the design of the azimuth angle θ emitted by the sound source that produces vibrational sound;

[0045] Figure 7B This is a cross-section used for simulating the sound field distribution along the yz axis;

[0046] Figure 7CThis is a cross-section used for simulating the sound field distribution along the xz axis;

[0047] Figure 8A The audio and tactile hybrid driving waveform corresponding to the vibration sound that drives the touch substrate to emit a periodic vibration sensation;

[0048] Figure 8B The audio and tactile mixed driving waveform corresponding to the vibration sound that drives the touch board to emit a tapping vibration sensation;

[0049] Figure 9 This is a schematic diagram of the structure of a haptic feedback device provided in an embodiment of this disclosure. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] 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.

[0053] Thin-film piezoelectric materials possess high dielectric constants and transparency, making them ideal for use in vibrator structures integrated into screens. These vibrator structures can be used to implement haptic feedback in electronic devices. To achieve both haptic feedback and screen-based sound generation, thereby enhancing the realism and immersion of human-computer interaction, this disclosure provides a haptic feedback panel, such as... Figures 1-3 As shown, Figure 1 This is a plan view of the haptic feedback panel. Figure 2 for Figure 1 A schematic diagram of the cross-section along the AA' direction. Figure 3 for Figure 1 A cross-sectional view along the CC' direction shows that the haptic feedback panel includes:

[0054] Touch board 1;

[0055] At least one piezoelectric device 2 is located on one side of the touch substrate 1. The piezoelectric device 2 is configured to vibrate under the action of an alternating electric field with different resonant frequencies, and drive the touch substrate 1 to vibrate and emit vibration sound.

[0056] The tactile feedback panel provided in this embodiment can utilize the piezoelectric device 2 to realize the tactile feedback function and sound function of the tactile feedback panel. By utilizing the screen display of the touch substrate 1, an integrated visual, tactile, and auditory module design can be realized, which integrates virtual tactile feedback and screen sound. Virtual tactile feedback can be realized on the touch substrate 1 and corresponding sound prompts can be generated according to the tactile perception, thereby improving the realism and immersion of human-computer interaction.

[0057] Specifically, piezoelectric devices made of thin-film piezoelectric materials can vibrate when connected to an AC signal. Lower frequency signals (0–300 Hz) produce tactile vibrations, while higher frequency signals (300 Hz–20000 Hz) produce audio vibrations. The frequency of the AC signal corresponding to the most sensitive auditory location for the human body is 1000 Hz–3000 Hz, but this audio frequency is similar to a soprano voice, causing discomfort. The frequency of the AC signal corresponding to the most sensitive tactile location for the human body is 150 Hz–200 Hz. To design a system that simultaneously prompts the user to generate a corresponding tactile response signal, the frequency range of the AC signals corresponding to the audio and tactile responses should fall within the 500 Hz–800 Hz range. Therefore, the tactile feedback panel provided in this embodiment of the invention simultaneously achieves a carrier frequency fc range of 500 Hz–800 Hz for both tactile feedback and screen-generated sound.

[0058] In a specific implementation, the touch substrate 1 may include a substrate and a touch electrode layer located on the substrate. The substrate may be a glass substrate, and the material of the touch electrode layer may be a transparent conductive material such as ITO or IZO. The thickness of the touch substrate 1 is less than 1.5 mm.

[0059] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 4As shown, the piezoelectric device 2 includes a first electrode 21, a piezoelectric layer 22, and a second electrode 23 stacked sequentially; the first electrode 21 is close to the touch substrate 1 and is grounded, while the second electrode 23 is electrically connected to the driving voltage input terminal; wherein,

[0060] The first electrode 21 and the second electrode 23 are configured to form an alternating electric field, and the piezoelectric layer 22 is configured to vibrate under the action of the alternating electric field, thereby driving the touch substrate 1 to vibrate and emit a vibration sound.

[0061] In specific implementations, in the piezoelectric sensor provided in the embodiments of this disclosure, such as Figure 4 As shown, the haptic feedback panel may further include: a bonding electrode 24 disposed on the same layer as the first electrode 21, the bonding electrode 24 being disposed near the edge of the touch substrate 1, the bonding electrode 24 being used to connect to the driving voltage input terminal, the voltage signal input to the driving voltage input terminal being an AC voltage signal; the haptic feedback panel may further include: an insulating layer 3 and a wiring layer disposed on the side of the second electrode 23 facing away from the touch substrate 1, the wiring layer including wiring 4, one end of wiring 4 being electrically connected to the second electrode 23 through a first via V1 disposed on the insulating layer 3, and the other end of wiring 4 being electrically connected to the bonding electrode 24 through a second via V2 disposed on the insulating layer 3. In a specific implementation, a ground voltage signal is input to the first electrode 21 through the ground voltage input terminal, and an AC voltage signal is applied to the second electrode 23 through the driving voltage input terminal, thus forming an alternating electric field between the first electrode 21 and the second electrode 23, the frequency of the alternating electric field being the same as the frequency of the AC voltage signal. Under the action of the alternating electric field, the piezoelectric layer 22 deforms and generates a vibration signal, driving the touch substrate 1 to vibrate and emit a vibration sound.

[0062] In this embodiment, the first electrode 21 and the bonding electrode 24 can be made of the same material and formed by a patterning process.

[0063] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 1 and Figure 2 As shown, the piezoelectric device 2 can be designed using piezoelectric ceramics or piezoelectric thin films. The thickness of the piezoelectric device 2 is less than 1000 μm, the d33 characteristic of the piezoelectric device 2 is greater than 50 pC / N, and the piezoelectric device 2 is disposed on the edge of the touch substrate 1.

[0064] In practical implementation, to prevent the touch substrate surface from cracking and to provide initial friction, the haptic feedback panel provided in this embodiment of the present disclosure further includes an explosion-proof film layer 5 located on the side of the touch substrate 1 away from the piezoelectric device 2, and the transmittance of the explosion-proof film layer 5 is greater than 90%. Specifically, the material of the explosion-proof film layer 5 can be polyethylene terephthalate (PET) or acrylic material, the thickness of the explosion-proof film layer 5 can be greater than 30 μm, and the coefficient of friction between the explosion-proof film layer 5 and the user's finger is 0.4 to 0.7.

[0065] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 1 and Figure 2 As shown, the width w1 of the piezoelectric device 2 can be about 10mm, the thickness h of the piezoelectric device 2 can be about 20mm, and the distance d between the piezoelectric device 2 and the edge of the touch substrate 1 is less than 5mm. Of course, d is affected by the surface mount process and the shell design, and can be designed according to needs.

[0066] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 1 and Figure 2 As shown, the gap d1 between adjacent piezoelectric devices 2 in the same column is less than 1 mm, and the thickness h of the piezoelectric device 2 is less than the thickness of the touch substrate 1.

[0067] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 1 As shown, there can be multiple piezoelectric devices 2, with a row of piezoelectric devices 2 arranged on either side of the touch substrate 1 that are opposite to each other. Of course, a row of piezoelectric devices 2 can also be arranged around the entire perimeter of the touch substrate 1, depending on the touch requirements.

[0068] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 1 As shown, each piezoelectric device 2 can be connected in series or in parallel. Figure 1 The input driving voltage signals for the two piezoelectric devices 2 in the left and right columns are in phase. When the piezoelectric device 2 vibrates, it needs to generate an amplitude greater than 1 μm and an acceleration greater than 1G (9.8 m / s²). Figure 5A and Figure 5B As shown, Figure 5A This is a schematic diagram showing the amplitude generated when the piezoelectric device 2 vibrates under the action of alternating electric fields at different frequencies. Figure 5B The diagram shows the acceleration generated when the piezoelectric device 2 vibrates under the action of an alternating electric field at different frequencies. It can be seen that the piezoelectric device 2 vibrates significantly at 800Hz.

[0069] In practical implementation, when a piezoelectric device vibrates, it must meet two characteristics, such as... Figure 6A As shown, Figure 6A This is a simulation diagram of low-frequency (<1000Hz) vibration. The vibration has no specific morphology, allowing for simultaneous screen sound generation during vibration. For example... Figure 6B As shown, Figure 6B This is a schematic diagram of the standing wave vibration simulation at high frequency (>20kHz). The half wavelength of the standing wave needs to be less than 15mm, and the wavefront of the standing wave needs to be parallel to the short side of the touch substrate.

[0070] In practical implementation, in the haptic feedback panel provided in the embodiments of this disclosure, considering that human-computer interaction needs to have screen sound emission characteristics in addition to haptic feedback function, the relative position of the sound source to the user is very important. During normal operation, the touch panel (touchscreen) is located in front of the user; therefore, the direction of the sound source must be directly facing the user for optimal effect. Figure 7A As shown, when a sound source emits sound, it must be parallel to the sound source (Y-axis), and the azimuth angle θ of the sound source emitting the vibrating sound must be greater than 60°. For example... Figure 7B and Figure 7C As shown, Figure 7B and Figure 7C The profiles simulate the sound field distribution along the yz and xz axes, respectively. The maximum sound pressure level of the sound source is 0.04 Pa (corresponding to a 10V driving voltage). The sound pressure level shows a linear relationship with the driving voltage as the driving voltage increases. To determine the direction of the sound source, the touchscreen vibration needs to produce... Figure 6A The vibration shown enhances the air compression and rarefaction wave propulsion along the y-axis during vibration, thus improving the user experience.

[0071] In practical implementation, the vibration sound emitted by the touch substrate can include periodic vibration and tapping vibration sounds, such as... Figure 8A and Figure 8B As shown, Figure 8A and Figure 8B These are the audio and haptic hybrid drive waveforms, respectively. Figure 8A The audio and tactile hybrid driving waveform corresponding to the periodic vibration sound emitted by the touch substrate. Figure 8B The audio and tactile hybrid driving waveform corresponding to the vibration sound that drives the touch substrate to emit a tapping vibration sensation.

[0072] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, Figure 8A The audio and tactile hybrid driving waveform shown can drive the touch substrate to emit a periodic vibration sound. The driving voltage input to the second electrode of the piezoelectric device corresponding to this audio and tactile hybrid driving waveform satisfies the following relationship:

[0073] Y=(sin(2*π*0.5*t))*(0.5-0.5*cos(2*π*fe*t))*sin(2*π*fc*t);

[0074] Where Y is the driving voltage, fc is the carrier frequency, fe is the envelope frequency, and t is the vibration time.

[0075] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, Figure 8B The audio-haptic hybrid driving waveform shown can drive the touch substrate to emit a tapping vibration sound. The driving voltage input to the second electrode of the piezoelectric device corresponding to this audio-haptic hybrid driving waveform satisfies the following relationship:

[0076] Y=exp(-1*β*t)*sin(2*π*fc*t);

[0077] Where Y is the driving voltage, β is the inversion attenuation coefficient, fc is the carrier frequency, and t is the vibration time.

[0078] It should be noted that the embodiments disclosed herein... Figure 8A and Figure 8B In the audio and haptic hybrid drive waveform shown, the value of fc is 800Hz and the value of fe is 150Hz.

[0079] Specifically, such as Figure 1 and Figure 4 As shown, a ground signal is applied to the first electrode 21 of the piezoelectric device 2, and the driving voltage Y corresponding to the vibration sound that drives the touch substrate 1 to emit a periodic vibration is applied to the second electrode 23 of the piezoelectric device 2. According to the vibration requirements, the driving voltage corresponding to the audio and tactile mixed driving waveform is selected to realize tactile feedback and screen sound emission at the same time.

[0080] In specific implementation, in the haptic feedback panel provided in the embodiments of this disclosure, such as Figure 4 As shown, the thickness of the piezoelectric layer 22 can be from 500 nm to 2000 nm. For example, the thickness of the piezoelectric layer 22 can be 500 nm, 600 nm, 700 nm, 800 nm, 900 nm, 1000 nm, 1100 nm, 1200 nm, 1300 nm, 1400 nm, 15000 nm, 1600 nm, 1700 nm, 1800 nm, 1900 nm or 2000 nm.

[0081] In specific implementation, the first and second electrodes 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 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 electrode layers according to the actual application needs, and there are no limitations here.

[0082] 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 piezoelectric sensor, and the corresponding piezoelectric sensor can be applied to haptic feedback devices. Moreover, PZT has high light transmittance, so when it is integrated into a display device, it does not affect the display quality of the display device.

[0083] The touch feedback 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, piezoelectric sensors can be applied to devices that generate vibration and mechanical properties, such as brake pads, keyboards, mobile terminals, game controllers, and automotive components.

[0084] Based on the same inventive concept, this disclosure also provides a haptic feedback method for driving the above-mentioned haptic feedback panel, including:

[0085] When an alternating electric field with different resonant frequencies is applied to a piezoelectric device, the piezoelectric device vibrates under the action of the alternating electric field, which in turn drives the touch substrate to vibrate and emit a vibration sound.

[0086] The haptic feedback method for driving the haptic feedback panel provided in this embodiment can realize the integrated visual, haptic, and auditory module design of virtual haptics and screen sound. It can realize virtual haptics on the touch substrate and generate corresponding sound prompts for haptic perception, thereby improving the realism and immersion of human-computer interaction.

[0087] In a specific implementation, in the tactile feedback method provided in the embodiments of this disclosure, a ground signal is applied to the first electrode of the piezoelectric device, and a driving voltage corresponding to the vibration sound that drives the touch substrate to emit a periodic vibration is applied to the second electrode of the piezoelectric device. The driving voltage satisfies the following relationship:

[0088] Y=(sin(2*π*0.5*t))*(0.5-0.5*cos(2*π*fe*t))*sin(2*π*fc*t);

[0089] Where Y is the driving voltage, fc is the carrier frequency, fe is the envelope frequency, and t is the vibration time.

[0090] In a specific implementation, in the tactile feedback method provided in the embodiments of this disclosure, a ground signal is applied to the first electrode of the piezoelectric device, and a driving voltage corresponding to the vibration sound that drives the touch substrate to emit a tapping vibration is applied to the second electrode of the piezoelectric device. The driving voltage satisfies the following relationship:

[0091] Y=exp(-1*β*t)*sin(2*π*fc*t);

[0092] Where Y is the driving voltage, β is the inversion attenuation coefficient, fc is the carrier frequency, and t is the vibration time.

[0093] It should be noted that the tactile feedback method provided in the embodiments of this disclosure can refer to the tactile feedback principle in the aforementioned tactile feedback panel, and will not be repeated here.

[0094] Based on the same inventive concept, this disclosure also provides a haptic feedback device, such as... Figure 9 As shown, the device includes: the haptic feedback panel 100 provided in this embodiment, and a display substrate 200 located on the side of the piezoelectric device 2 in the haptic feedback panel 100 facing away from the touch substrate 1. 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 described again. 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.

[0095] In specific implementations, the display substrate provided in the embodiments of this disclosure can be a liquid crystal display (LCD) substrate or an organic light-emitting diode (OLED) display substrate.

[0096] Specifically, such as Figure 9 As shown, taking the display substrate 200 as a liquid crystal display (LCD) substrate as an example, the tactile feedback device also includes a backlight module 300 located on the side of the display substrate 200 away from the touch substrate 1.

[0097] In specific implementation, in the tactile feedback device provided in the embodiments of this disclosure, such as Figure 9 As shown, the display substrate 200 includes a display area AA and a peripheral area BB located around the display area AA. The orthographic projection of the piezoelectric device 2 on the display substrate 200 is located within the peripheral area BB. In this way, the piezoelectric device 2 does not affect the display of the display substrate 200.

[0098] In specific implementation, in the tactile feedback device provided in the embodiments of this disclosure, such as Figure 9 As shown, it also includes a foam layer 400 located between the piezoelectric device 2 and the display substrate 200. Specifically, the width w2 of the foam layer 400 is smaller than the width w1 of the piezoelectric device 2, and the Young's modulus of the foam layer 400 is <0.1 GPa.

[0099] Specifically, such as Figure 9 As shown, the gap d2 between the display substrate 200 and the touch substrate 1 is greater than 0.3 mm. Figure 9 The structure shown is the design of the resonant cavity that affects the deformation of the piezoelectric device 2 and the sound emission from the screen.

[0100] In specific implementation, in the tactile feedback device provided in the embodiments of this disclosure, such as Figure 9 As shown, it also includes a housing layer 500 for fixing the haptic feedback panel 100 and the display substrate 200. The housing layer 500 includes: a first shielding portion 501 fixed to the side of the haptic feedback panel 100 opposite to the display substrate 200, and a second shielding portion 501 fixed to the side of the haptic feedback panel 100, the display substrate 200, and the backlight module 300; the first shielding portion 501 and the second shielding portion 502 are an integral structure; wherein,

[0101] The orthographic projection of the piezoelectric device 2 on the display substrate 200 is located within the orthographic projection range of the first shielding portion 501 on the display substrate 200, and the orthographic projection of the foam layer 400 on the display substrate 200 is located within the orthographic projection range of the piezoelectric device 2 on the display substrate 200.

[0102] The haptic feedback device provided in this embodiment integrates the haptic feedback panel with the display substrate. It can realize the haptic feedback function and sound function of the haptic feedback panel by using piezoelectric devices. Then, by using the screen display of the touch substrate, it can realize the integrated visual, haptic and auditory module design of virtual haptics and screen sound. Virtual haptics can be realized on the touch substrate and corresponding sound prompts can be generated according to the haptic perception, thereby improving the realism and immersion of human-computer interaction.

[0103] 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.

[0104] 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.

[0105] This disclosure provides a haptic feedback panel, its haptic feedback method, and haptic feedback device. The haptic feedback panel can utilize piezoelectric devices to realize the haptic feedback function and sound function. By utilizing the screen display of the touch substrate, an integrated visual, haptic, and auditory module design can be realized, which integrates virtual haptics and screen sound. Virtual haptics can be realized on the touch substrate and corresponding sound prompts can be generated according to the haptic perception, thereby improving the realism and immersion of human-computer interaction.

[0106] 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.

[0107] 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 haptic feedback panel, wherein, include: Touch board; At least one piezoelectric device is located on one side of the touch substrate. The piezoelectric device includes a first electrode, a piezoelectric layer, and a second electrode stacked sequentially. The first electrode is close to the touch substrate and is grounded. The second electrode is electrically connected to a driving voltage input terminal. The first electrode and the second electrode are configured to form an alternating electric field with different resonant frequencies. The piezoelectric layer is configured to vibrate under the action of the alternating electric field, driving the touch substrate to vibrate and emit a vibration sound. The driving voltage input to the driving voltage input terminal that drives the touch substrate to emit a periodic vibration sound satisfies the following relationship: Y = (sin(2 π 0.5 t)) (0.5-0.5 foot(2 π he / she t)) that(2 π fc t); Where Y is the driving voltage, fc is the carrier frequency, fe is the envelope frequency, and t is the vibration time; Alternatively, the driving voltage input to the driving voltage input terminal corresponding to the vibration sound that causes the touch substrate to emit a tapping sensation satisfies the following relationship: Y = exp(-1 β t) sin(2 π fc t); Where Y is the driving voltage, β is the inversion attenuation coefficient, fc is the carrier frequency, and t is the vibration time.

2. The haptic feedback panel as described in claim 1, wherein, fc is 500Hz~800Hz.

3. The haptic feedback panel as described in claim 1, wherein, The azimuth angle of the sound source emitting the vibration is greater than 60°.

4. The haptic feedback panel as described in claim 1, wherein, The number of piezoelectric devices is multiple, and a row of piezoelectric devices is arranged on each of the two opposite sides of the touch substrate.

5. The haptic feedback panel as described in claim 4, wherein, Each of the piezoelectric devices is connected in series or in parallel.

6. The haptic feedback panel as claimed in claim 1, wherein, The gap between adjacent piezoelectric devices is less than 1 mm, and the thickness of the piezoelectric device is less than the thickness of the touch substrate.

7. The haptic feedback panel as claimed in claim 1, wherein, It also includes an explosion-proof film layer located on the side of the touch substrate opposite to the piezoelectric device, the explosion-proof film layer having a transmittance of greater than 90%.

8. The haptic feedback panel as claimed in claim 1, wherein, The thickness of the piezoelectric layer is 500nm~2000nm.

9. The haptic feedback panel as claimed in claim 1, wherein, The piezoelectric layer includes at least one of lead zirconate titanate, aluminum nitride, zinc oxide, barium titanate, lead titanate, potassium niobate, lithium niobate, lithium tantalate, and lanthanum gallium silicate.

10. A haptic feedback device, wherein, include: The haptic feedback panel as described in any one of claims 1 to 9, and the display substrate on the side of the piezoelectric device located in the haptic feedback panel facing away from the touch substrate.

11. The haptic feedback device as claimed in claim 10, wherein, The display substrate includes a display area and a peripheral area located around the display area, and the orthographic projection of the piezoelectric device on the display substrate is located within the peripheral area.

12. The haptic feedback device as claimed in claim 11, wherein, It also includes a foam layer located between the piezoelectric device and the display substrate, the width of which is smaller than the width of the piezoelectric device.

13. The haptic feedback device as claimed in claim 12, wherein, It also includes a housing layer for fixing the haptic feedback panel and the display substrate, the housing layer comprising: a first shielding portion fixed to the side of the haptic feedback panel opposite to the display substrate, and a second shielding portion fixed to the side of the haptic feedback panel and the display substrate; the first shielding portion and the second shielding portion are an integral structure; wherein, The orthographic projection of the piezoelectric device on the display substrate is located within the orthographic projection range of the first shielding portion on the display substrate, and the orthographic projection of the foam layer on the display substrate is located within the orthographic projection range of the piezoelectric device on the display substrate.

14. A haptic feedback method for driving a haptic feedback panel as described in any one of claims 1 to 9, wherein, include: When alternating electric fields of different resonant frequencies are applied to the piezoelectric device, the piezoelectric device vibrates under the action of the alternating electric fields, driving the touch substrate to vibrate and emit vibration sound; wherein, A ground signal is applied to the first electrode of the piezoelectric device, and a driving voltage corresponding to the vibration sound that drives the touch substrate to emit a periodic vibration is applied to the second electrode of the piezoelectric device. The driving voltage satisfies the following relationship: Y = (sin(2 π 0.5 t)) (0.5-0.5 foot(2 π he / she t)) that(2 π fc t); Where Y is the driving voltage, fc is the carrier frequency, fe is the envelope frequency, and t is the vibration time; Alternatively, a ground signal is applied to the first electrode of the piezoelectric device, and a driving voltage corresponding to the vibration sound that causes the touch substrate to emit a tapping vibration is applied to the second electrode of the piezoelectric device, wherein the driving voltage satisfies the following relationship: Y = exp(-1 β t) sin(2 π fc t); Where Y is the driving voltage, β is the inversion attenuation coefficient, fc is the carrier frequency, and t is the vibration time.

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