Patent Publication Number: US-2023152892-A1

Title: Haptic feedback base plate, haptic feedback apparatus and haptic feedback method

Description:
TECHNICAL FIELD 
     The present disclosure relates to the technical field of haptic feedback, in particular to a haptic feedback base plate, a haptic feedback apparatus and a haptic feedback method. 
     BACKGROUND 
     With the development of technologies, touch screens have been used more and more widely and gradually become one of the most convenient human-computer interaction devices. In recent years, to further improve the usage experience of human-computer interaction, the haptic feedback technique has emerged and gained more and more attention and research. 
     SUMMARY 
     The present disclosure discloses a haptic feedback base plate, comprising: 
     a substrate and a deformation unit disposed on one side of the substrate, wherein the deformation unit comprises a first electrode, a piezoelectric material layer and a second electrode which are arranged in a stacked manner, the first electrode is arranged close to the substrate, the first electrode and the second electrode are configured to form an alternating electric field, and the piezoelectric material layer vibrates under the effect of the alternating electric field and drives the substrate to resonate; 
     wherein, a difference between a frequency of the alternating electric field and an inherent frequency of the substrate is less than or equal to a preset threshold. 
     In an optional implementation, the deformation unit is arranged at a vibration crest and/or a vibration trough of the substrate. 
     In an optional implementation, further comprising: 
     a bind electrode disposed on a same layer with the first electrode, wherein the bind electrode is arranged close to an edge of the substrate and is configured to connect a drive voltage input terminal, and a voltage signal input by the drive voltage input terminal is an alternating voltage signal; and 
     an insulating layer and a trace layer that are disposed on a side, away from the substrate, of the second electrode, wherein the trace layer comprises a trace having one end connected to the second electrode through a first via hole formed in the insulating layer and the other end connected to the bind electrode through a second via hole formed in the insulating layer. 
     In an optional implementation, further comprising: 
     a lead electrode disposed on a same layer with the first electrode, wherein the lead electrode is connected to the first electrode and is configured to connect a grounding voltage input terminal, and a voltage signal input by the grounding voltage input terminal is a grounding voltage signal. 
     In an optional implementation, when the lead electrode is connected to a plurality of the first electrodes, resistances between the lead electrode and each of the plurality of the first electrodes are equal. 
     In an optional implementation, a plurality of the deformation units are provided, the plurality of the deformation units are arranged on one side of the substrate in an array, the first electrodes of the deformation units in a same column are communicated with each other, and the second electrodes of the deformation units in the same column are connected to a same trace in the trace layer. 
     In an optional implementation, in a plane parallel to the substrate, a size of the deformation unit is less than a half-wavelength of vibrations of the substrate. 
     In an optional implementation, a thickness of the piezoelectric material is greater than or equal to 1 μm and less than or equal to 10 μm. 
     In an optional implementation, edges of the second electrode are indented relative to edges of the piezoelectric material layer. 
     In an optional implementation, indentation distances of the edges of the second electrode relative to the edges of the piezoelectric material layer are greater than or equal to 100 μm and less than or equal to 500 μm. 
     In an optional implementation, the edges of the piezoelectric material layer are indented relative to edges of the first electrode. 
     The present disclosure provides a haptic feedback apparatus, comprising the above haptic feedback base plate. 
     In an optional implementation, further comprising: a displaying substrate disposed on a side, away from the substrate, of the deformation unit, wherein the displaying substrate comprises an active area and a peripheral area located on a periphery of the active area, and an orthographic projection of the deformation unit on the displaying substrate is located within the peripheral area. 
     In an optional implementation, a touch electrode layer or a touch film is disposed on a side, close to the displaying substrate, of the substrate, and an orthographic projection of the touch electrode layer or the touch film on the displaying substrate covers the active area. 
     The present disclosure provides a haptic feedback method being applied to the above haptic feedback base plate, and the method comprises: 
     applying voltage signals to the first electrode and the second electrode, respectively, to form an alternating electric field between the first electrode and the second electrode, and enabling the piezoelectric material layer to vibrate under the effect of the alternating electric field and drive the substrate to resonate, wherein a difference between a frequency of the alternating electric field and an inherent frequency of the substrate is less than or equal to a preset threshold. 
     The aforesaid description is merely a brief summary of the technical solution of the present disclosure. To allow those skilled in the art to gain a better understanding of the technical means of the present disclosure so as to implement the present disclosure according to the contents in the specification and to make the above and other purposes, features and advantages of the present disclosure clearer, specific implementations of the present disclosure are given below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To more clearly explain the technical solutions of the embodiments of the present disclosure or the prior art, drawings used for describing the embodiments of the present disclosure or the prior art will be briefly introduced below. Obviously, the drawings in the following description only illustrate some embodiments of the present disclosure, and those ordinarily skilled in the art can obtain other drawings according to the following ones without creative labor. 
         FIG.  1    illustrates a sectional structural view of a haptic feedback base plate according to one embodiment of the present disclosure; 
         FIG.  2    illustrates a plan structural view and a simulation diagram of a haptic feedback base plate according to one embodiment of the present disclosure; 
         FIG.  3    illustrates a plan structural view of first electrodes according to one embodiment of the present disclosure; 
         FIG.  4    illustrates a plan structural view of an insulating layer being partially removed according to one embodiment of the present disclosure; 
         FIG.  5    illustrates a plan structural view of a trace layer according to one embodiment of the present disclosure; 
         FIG.  6    illustrates a plan structural view of piezoelectric material layers according to one embodiment of the present disclosure; 
         FIG.  7    illustrates a plan structural view of second electrodes according to one embodiment of the present disclosure; 
         FIG.  8    illustrates a structural view and an equivalent circuit diagram of first electrodes and a lead electrode according one embodiment of the present disclosure; 
         FIG.  9    illustrates a first improved structural view of the first electrode and the lead electrode according to one embodiment of the present disclosure; 
         FIG.  10    illustrates a second improved structural view of the first electrode and the lead electrode according to one embodiment of the present disclosure; 
         FIG.  11    illustrates a sectional structural view of a first haptic feedback apparatus according to one embodiment of the present disclosure; 
         FIG.  12    illustrates a sectional structural view of a second haptic feedback apparatus according to one embodiment of the present disclosure; 
         FIG.  13    illustrates a plan structural view after a piezoelectric material layer is prepared according to one embodiment of the present disclosure; 
         FIG.  14    illustrates a plan structural view after a second electrode layer is prepared according to one embodiment of the present disclosure; and 
         FIG.  15    illustrates a plan structural view after a trace layer is prepared according to one embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     To clarify the purposes, technical solutions and advantages of the embodiments of the present disclosure, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the embodiments in the following description are merely illustrative ones, and are not all possible ones of the present disclosure. All other embodiments obtained by those ordinarily skilled in the art based on the following ones without creative labor should also fall within the protection scope of the present disclosure. 
     One embodiment of the present disclosure provides a haptic feedback base plate. Referring to  FIG.  1   , the haptic feedback base plate comprises: a substrate  11  and a deformation unit  12  disposed on one side of the substrate  11 , wherein the deformation unit  12  comprises a first electrode  121 , a piezoelectric material layer  122  and a second electrode  123  that are arranged in a stacked manner, the first electrode  121  is arranged close to the substrate  11 , the first electrode  121  and the second electrode  123  are configured to form an alternating electric field, and the piezoelectric material layer  122  vibrates under the effect of the alternating electric field and drives the substrate  11  to resonate; and a difference between a frequency of the alternating electric field and an inherent frequency of the substrate  11  is less than or equal to a preset threshold. 
     Wherein, the substrate  11  may be a glass substrate or the like, and this embodiment has no limitation in this aspect. 
     For example, the first electrode  121  and the second electrode  123  may be made of a transparent electrode material such as ITO to improve the transmittance of the haptic feedback base plate. The present disclosure has no limitation to the specific material of the first electrode  121  and the second electrode  123 . 
     The piezoelectric material layer  122  may be made of an inorganic piezoelectric material such as piezoelectric crystals or piezoelectric ceramic, or may be made of an organic piezoelectric material such as polyvinylidene fluoride, and this embodiment has no limitation in this aspect. Wherein, the piezoelectric material is able to realize mutual conversion between mechanical vibrations and alternating currents. 
     Wherein, the inherent frequency of the substrate  11  is also referred to as natural frequency. When an object, such as the substrate  11 , vibrates freely, the displacement of the object sinusoidally or cosinoidally varies with time, and the vibration frequency is unrelated with initial conditions, and is only related to inherent properties of the object (such as mass, shape and material). 
     In specific implementation, referring to  FIG.  1   , for example, a grounding voltage signal is applied to the first electrode  121 , and an alternating voltage signal is applied to the second electrode  123 , such that an alternating electric field is formed between the first electrode  121  and the second electrode  123 , wherein the frequency of the alternating electric field is the same as the frequency of the alternating voltage signal. Under the effect of the alternating electric field, the piezoelectric material layer  122  deforms and generates a vibration signal, the frequency of which is the same as the frequency of the alternating electric field; and when the frequency of the vibration signal is close or equal to the inherent frequency of the substrate  11 , the substrate  11  vibrates synchronously to increase the vibration amplitude to generate a haptic feedback signal, so users may obviously feel the change of the friction when touching the surface of the substrate  11  with their fingers. In actual application, the friction on the surface of the substrate  11  may be controlled by means of synchronous vibrations between the piezoelectric material layer  122  and the substrate  11 , such that the texture of objects is represented on the surface of the substrate  11 . 
     With the increase of the voltage of the alternating voltage signal, the amplitude of vibrations of the substrate  11  will be increased, and the haptic experience of users will become more and more obvious. Thus, the intensity of the haptic feedback signal may be controlled by regulating the voltage of the alternating voltage signal. 
     According to the haptic feedback base plate in this embodiment, voltage signals are applied to the first electrode and the second electrode respectively to form an alternating electric field between the first electrode and the second electrode, the piezoelectric material layer deforms under the effect of the alternating electric field, and when the frequency of the alternating electric field is close to the inherent frequency of the substrate, the substrate is driven to resonate to increase the vibration amplitude, such that haptic feedback is realized on the surface of the substrate. 
     In an optional embodiment, referring to  FIG.  2   , the deformation unit  12  may be disposed at a vibration crest and/or vibration trough of the substrate  11 . 
     When one deformation unit  12  is configured, the deformation unit may be located at a crest or trough of a natural vibration mode of the substrate  11 . When multiple deformation units  12  are configured, the deformation units  12  may be entirely located at the crests or troughs; or, part of the deformation units  12  are located at the crests, and the other part of the deformation units  12  are located at the troughs. It should be noted that the deformation unit  12  may be disposed near the crest or trough as actually needed to be compatible with multiple natural vibration modes of the substrate  11  (such as 0*6 node, 0*7 node, 0*8 node, 0*9 node and 0*10 node). The specific position of the deformation unit  12  on the substrate  11  may be adjusted to fulfill the purpose of a maximum vibration amplitude, and this embodiment has no limitation in this aspect. 
     In this embodiment, referring to  FIG.  2   , multiple deformation units  12  are configured and are arranged on one side of the substrate  11  in an array. When multiple deformation units  12  are configured, each deformation unit  12  is driven separately, or the deformation units  12  in the same column are driven synchronously (column drive), or all the deformation units  12  are driven synchronously. This embodiment has no limitation to the specific drive mode of the multiple deformation units  12 . The specific structure of column drive will be introduced in detail in subsequent embodiments. 
     Refer to  FIG.  2   , wherein a in  FIG.  2    illustrates an arrangement diagram of deformation units on the substrate in this embodiment, b in  FIG.  2    illustrates a vibration waveform of the natural vibration mode 0*10 node of the substrate, and c in  FIG.  2    illustrates a modal simulation diagram of the natural vibration mode 0*10 node of the substrate. As illustrated by a in  FIG.  2   , multiple deformation units  12  are arranged on the substrate  11  in axial symmetry. Nine columns of deformation units  12  are arranged on the substrate  11 . One column of deformation units  12  is correspondingly arranged on each crest or trough of the natural vibration mode 0*10 node of the substrate, wherein six deformation units  12  are arranged in each odd column, and two deformation units  12  are arranged in each even column and are located in the initial row and the last row in this even column, respectively. When an alternating voltage with a frequency 24.2 kHz and a peak voltage V pp &lt;35 V is applied between the first electrode  121  and the second electrode  123  of each deformation unit illustrated by a in  FIG.  2   , the vibration amplitude of the substrate  11  may be greater than 1 μm, and the wavelength may be less than 15 mm, which accord with the industry standards of commercial haptic display devices. Users may obviously feel the change of friction when touching the surface of the substrate  11  with their fingers, such that haptic feedback is realized. 
     Wherein, the node refers to a column of points with a constant amplitude 0 in the natural vibration mode of the substrate  11  (corresponding to column drive). The vibration mode 0*10 node indicates that ten columns of points on the substrate  11  have a constant amplitude 0 in this vibration mode, as illustrated by b in  FIG.  2   . 
     In actual application, the inherent frequency and natural vibration mode of the substrate  11  may be determined by simulation according to intrinsic parameters of the substrate  11  such as mass, shape and material (in case of multiple inherent frequencies and natural vibration modes, the inherent frequency and natural vibration mode corresponding to a large amplitude are selected), then vibration crests and vibration troughs of the substrate  11  are determined, and after that, the deformation units are disposed at or near the crests and/or troughs. 
     In specific implementation, when multiple deformation units  12  are disposed in the haptic feedback base plate, the haptic feedback signal will be more uniform with the increase of the vibration amplitude of the substrate  11  in the same vibration mode. The number of deformation units  12  disposed in the haptic feedback base plate may be determined according to the wiring space or other factors, and with the permission of the wiring space, the deformation units  12  may be configured as many as possible. This embodiment has no limitation to the specific number of the deformation units  12 . 
     To enable the deformation units  12  to avoid the nodes of the substrate  11  and ensure that the wavelength is less than 15 mm, in one optional embodiment, in a plane parallel to the substrate  11 , the size of the deformation units  12  may be less than the half-wavelength of the vibrations of the substrate  11  in a vibration propagation direction of the substrate  11 , that is, the size of the deformation units  12  may be less than the half-wavelength of the natural vibration mode of the substrate  11 . For example, when the wavelength of the natural vibration mode of the substrate  11  is 15 mm, the size of the deformation units  12  may be less than 7.5 mm. It should be noted that this embodiment has no limitation to the shape of the deformation units  12 , and the deformation units  12  may be rectangular as illustrated by a in  FIG.  2   , or circular, pentagonal, hexagon, or the like. Wherein, the vibration propagation direction of the substrate  11  is parallel to the row direction of the array of the deformation units illustrated by a in  FIG.  2   . 
     In one optional embodiment, the thickness of the piezoelectric material layer  122  may be greater than or equal to 1 μm and less than or equal to 10 μm. For example, the thickness of the piezoelectric material layer  122  may be 2 μm. The piezoelectric material layer  122  is very thin, such that the transmittance of the haptic feedback base plate is high. 
     In one optional embodiment, referring to  FIG.  1    and  FIG.  3   , the haptic feedback base plate may further comprise: 
     A bind electrode  13  disposed on the same layer with the first electrode  121 , wherein the bind electrode  13  is arranged close to an edge of the substrate  11  and is connected to a drive voltage input terminal, and a voltage signal input by the drive voltage input terminal is an alternating voltage signal. Wherein, edges, close to each other, of the bind electrode  13  may be edges, parallel to the vibration propagation direction, of the substrate  11 , such as a top edge and a bottom edge in  FIG.  3   . 
     Referring to  FIG.  1   , the haptic feedback base plate may further comprise: an insulating layer  14  and a trace layer  15  disposed on a side, away from the substrate  11 , of the second electrode  123 , wherein the trace layer  15  comprises a trace, one end of the trace is connected to the second electrode  123  through a first via hole  141  formed in the insulating layer  14 , and the other end of the trace is connected to the bind electrode  13  through a second via hole  142  formed in the insulating layer  14 . Wherein, the frequency of the alternating voltage signal may be close or equal to the inherent frequency of the substrate  11 . 
     In one optional embodiment, referring to  FIG.  3   , the haptic feedback base plate may further comprise: 
     A lead electrode  31  disposed on the same layer with the first electrode  121 , wherein the lead electrode  31  is connected to the first electrode  121  and is connected to a grounding voltage input terminal, and a voltage signal input by the grounding voltage input terminal is a grounding voltage signal. 
     In this embodiment, the first electrode  121 , the bind electrode  13  and the lead electrode  31  may be made of the same material and formed by the same patterning process. 
     Wherein, the insulating layer  14  may adopt a negative photoresist or a positive photoresist. After the whole surface of the insulating layer  14  is coated or deposited with an insulating layer material, pattern areas shown in  FIG.  4    are removed. The insulating layer  14  is arranged for the purpose of covering part of the first electrode  121  to prevent short circuits between the trace layer and other structures. The first via hole  141  is formed in a position, corresponding to the second electrode  123 , of the insulating layer  14 , and the second via hole  142  is formed in a position, corresponding to the bind electrode  13 , of the insulating layer  14 , such that one end of the trace in the trace layer is connected to the second electrode  123  through the first via hole  141 , and the other end of the trace is connected to the bind electrode  13  through the second via hole  142 . A lead electrode via hole  41  may be formed in a position, corresponding to the lead electrode  31 , of the insulating layer  14 , such that an external lead is connected to the lead electrode  31  with elargol or in other manners. 
     Referring to  FIG.  5    which illustrates the structural view of the trace layer, the trace  51  in the trace layer  15  is used for connecting the second electrode  123  to the bind electrode  13 . 
     It should be noted that the first electrodes  121  of all the deformation units  12  may be communicated with each other. In this embodiment, to reduce the parasitic capacitance, the first electrodes  121  in the same column are communicated with each other, as shown in  FIG.  3   . Referring to  FIG.  6    which illustrates the structural view of the piezoelectric material layers and  FIG.  7    which illustrates the structural view of the second electrodes, the piezoelectric material layers of the deformation units  12  may be separated, and the second electrodes  123  of the deformation units  12  may also be separated, which is beneficial to maintenance. For example, when a short circuit happens to one deformation unit  12 , the second electrode  123  of this deformation unit  12  may be isolated, such that other deformation units  12  will not be affected by the short circuit point. 
     To reduce the risk of short circuits, referring to  FIG.  1   , edges of the second electrodes  123  may be indented relative to edges of the piezoelectric material layer  122 . In actual implementation, indentation distances of the edges of the second electrode  123  relative to the edges of the piezoelectric material layer  122  are greater than or equal to 100 μm and less than or equal to 500 μm, such as 150 μm. 
     To further reduce the risk of short circuits, the edges of the piezoelectric material layer  122  may be indented with respect to edges of the first electrode  121 . 
     In an actual fabrication process, the first electrode  121 , the piezoelectric material layer  122 , the second electrode  123 , the insulating layer  14  and the trace layer  15  may be sequentially formed on the substrate  11 . Please refer to  FIG.  3    which illustrates a plan structural view after the first electrodes are prepared,  FIG.  13    which illustrates a plan structural view after a piezoelectric material layer is prepared,  FIG.  14    which illustrates a plan structural view after the second electrodes are prepared, and  FIG.  15    which illustrates a plan structural view after the trace layer is prepared. Wherein,  FIG.  1    illustrates a sectional structural view of the part, marked with the thick black line, in  FIG.  15   . 
     In one optional embodiment, referring to a in  FIG.  2   , multiple deformation units  12  are configured and are arranged on one side of the substrate  11  in an array, the first electrodes  121  of the deformation units  12  in the same column are communicated with each other (as shown in  FIG.  3   ), and the second electrodes  123  of the deformation units  12  in the same column are connected to the same trace  51  in the trace layer  15  (as shown in  FIG.  5   ), that is, the second electrodes  123  of the deformation units  12  in the same column are communicated with each other by means of the same trace  51  in the trace layer  15 . In this way, the deformation units  12  with the first electrodes  121  being communicated with each other and the second electrodes  123  being communicated with each other in the same column may be driven synchronously, and column drive is realized. It should be noted that when all the deformation units  12  on the haptic feedback base plate need to be driven synchronously, all the second electrodes  123  may be communicated by means of the trace in the trace layer  15 . 
     The inventor finds that when one lead electrode  31  is connected to multiple first electrodes  121 , referring to a in  FIG.  8    which illustrates the structural view of the first electrodes  121  and the lead electrode  31  and b in  FIG.  8    which illustrates an equivalent circuit diagram of the first electrodes  121  and the lead electrode  31 , the resistance R 1  between the first electrode  121  close to the lead electrode  31  (the first electrode in the middle) and the lead electrode  31  is small, the resistances R 2  and R 3  between the first electrodes  121  away from the lead electrode  31  and the lead electrode  31  are large, that is, R 1 &lt;&lt;R 2 , and R 1 &lt;&lt;R 3 ; and under a high voltage such as an alternating peak voltage V ac, pp &gt;40V, or a direct current V DC &gt;14V, the local current density between the first electrode  121  close to the lead electrode  31  and the lead electrode  31  is large, which is likely to cause a burnout of the circuit. 
     To solve the above problem, in one optional embodiment, when the lead electrode  31  is connected to multiple first electrodes  121 , the resistances between the lead electrode  31  and all the first electrodes  121  may be set to be equal. 
     In specific implementation, according to the resistance calculation formula R=ρ× /A, the resistance difference may be decreased by extending the length of the trace between the first electrode  121  close to the lead electrode  31  and the lead electrode  31 , to ensure R 1 =R 2 =R 3  to realize uniform distribution of the current density is realized, as shown in  FIG.  9   . 
     In addition, the resistance difference may also be decreased by reducing the width of the trace between the first electrode  121  close to the lead electrode  31  and the lead electrode  31 , to ensure R 1 =R 2 =R 3  to realize uniform distribution of the current density, as shown in  FIG.  10   . 
     In this embodiment, the current density generated by a drive electric signal in the circuit may be dispersed or uniformized by adjusting the length and/or width of the trace between the first electrodes  121  and the lead electrode  31  to reduce device failures caused by an excessive local current density. 
     One embodiment of the present disclosure further provides a haptic feedback apparatus, comprising the haptic feedback base plate in any one of the above-mentioned embodiments. 
     In one optional embodiment, referring to  FIG.  11   , the haptic feedback apparatus may further comprise: a displaying substrate  111  disposed on a side, away from the substrate  11 , of the deformation unit  12 , wherein the displaying substrate  111  comprises an active area A and a peripheral area B located on the periphery of the active area A, and an orthographic projection of the deformation unit  12  on the displaying substrate  111  is located in the peripheral area B. 
     In specific implementation, when the peripheral area B of the displaying substrate  111  is located on left and right sides of the active area A, two rows of deformation units  12  may be configured and located in the peripheral area B on the left and right sides respectively, as shown in  FIG.  11   . Of course, only one column of deformation units  12  may be configured and located in the peripheral area B on the left or right side. Each column of deformation units  12  may include multiple deformation units  12 . 
     In this embodiment, no deformation unit  12  is disposed in the active area A, such that the transmittance of the haptic feedback base plate is further improved. 
     In one optional embodiment, referring to  FIG.  12   , a touch functional layer  121  may be disposed on a side, close to the displaying substrate  111 , of the substrate  11 , the touch functional layer  121  may be a touch electrode layer or a touch film, and an orthographic projection of the touch electrode layer or the touch film (namely the touch functional layer  121 ) on the displaying substrate  111  covers the active area A. 
     In specific implementation, the side, close to the displaying substrate  111 , of the substrate  11  is provided with a transparent ITO touch screen trace or is attached with a transparent touch film to realize a touch function. The active area A may be located within the orthographic projection of the touch functional layer  121  on the displaying substrate  111  or completely overlap with the orthographic projection of the touch functional layer  121  on the displaying substrate  111 , this embodiment has no limitation in this aspect. 
     It should be noted that the transmittance of the deformation unit  12  in the haptic feedback base plate is high, so the orthographic projection of the deformation unit  12  on the displaying substrate  111  may be located in the active area A. The specific configuration may be designed as actually needed. 
     One embodiment of the present disclosure further provides a haptic feedback method applied to the haptic feedback base plate in any one of the above-mentioned embodiments. The haptic feedback method comprises: 
     voltage signals are applied to the first electrode  121  and the second electrode  123  respectively to form an alternating electric field between the first electrode  121  and the second electrode  123 , and a piezoelectric material layer  122  vibrates under the effect of the alternating electric field and drives the substrate  11  to resonate, wherein a difference between a frequency of the alternating electric field and an inherent frequency of the substrate  11  is less than or equal to a preset threshold. 
     Wherein, the voltage signal applied to the first electrode  121  may be a grounding voltage signal, and the voltage signal applied to the second electrode  123  may be an alternating voltage signal. The frequency of the alternating voltage signal may be close or equal to the inherent frequency of the substrate  11 . 
     The embodiments of the present disclosure provide a haptic feedback base plate, a haptic feedback apparatus and a haptic feedback method. Wherein, the haptic feedback base plate comprises: a substrate and a deformation unit disposed on one side of the substrate, the deformation unit comprises a first electrode, a piezoelectric material layer and a second electrode that are arranged in a stacked manner, the first electrode is arranged close to the substrate, the first electrode and the second electrode are used to form an alternating electric field, and the piezoelectric material layer vibrates under the effect of the alternating electric field and drives the substrate to resonate; wherein, a difference between a frequency of the alternating electric field and an inherent frequency of the substrate is less than or equal to a preset threshold. According to the technical solution of the present disclosure, voltage signals are applied to the first electrode and the second electrode respectively to form an alternating electric field between the first electrode and the second electrode, the piezoelectric material layer deforms under the effect of the alternating electric field, and when the frequency of the alternating electric field is close to the inherent frequency of the substrate, the substrate is driven to resonate to improve the vibration amplitude, such that haptic feedback is realized on the surface of the substrate. 
     The embodiments in the specification are described progressively, the differences from other embodiments are emphatically stated in each embodiment, and the similarities of these embodiments can be cross-referenced. 
     Finally, it should be noted that relational terms such as “first” and “second” in this specification are merely used to distinguish one entity or operation from the other one, and do not definitely indicate or imply that these entities or operations have any actual relations or sequences. In addition, the term “comprise” or “include” or other variations are intended to refer to non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements not only comprises these elements listed, but also comprises other elements that are not clearly listed, or inherent elements of the process, method, article or terminal device. Unless otherwise clearly specified, an element defined by the expression “comprise a” shall not exclusive of other identical elements in a process, method, article or terminal device comprising said element. 
     The haptic feedback base plate, the haptic feedback apparatus, and the haptic feedback method provided by the present disclosure are described in detail above. Specific examples are used in the disclosure to illustrate the principles and implementations of the present disclosure. The description of the above embodiments is only used to help understand the methods and core ideas of the present disclosure; at the same time, for those of ordinary skill in the art, according to the ideas of the present disclosure, there will be changes in the specific implementation and scope of application. In summary, the content of this specification should not be construed as a limitation on this application. 
     “One embodiment”, “an embodiment” or “one or more embodiments” in this specification means that specific features, structures, or characteristics described in conjunction with said embodiment are included in at least one embodiment of the disclosure. In addition, it should be noted that the expression “in one embodiment” does not definitely refer to the same embodiment. 
     A great number of specific details are provided in this specification. However, it can be understood that the embodiments of the application can be implemented even without these specific details. In some embodiments, known methods, structures and techniques are not stated in detail to ensure that the understanding of this specification will not be obscured. 
     In the Claims, any reference marks should not be construed as limitations of the Claims. The term “comprise” shall not exclude the existence of elements or steps not listed in the Claims. “A/an” or “one” before an element shall not exclude the possibility of multiple said elements. The application may be implemented by means of hardware comprising a plurality of different elements and a properly programmed computer. In a Claim in which a plurality of devices are listed, several of these devices may be specifically implemented by means of the same hardware. Terms such as “first”, “second” and “third” do not indicate any order, and may be interpreted as names. 
     Finally, it should be noted that the above embodiments are merely used to explain the technical solutions of the application, and are not intended to limit the application. Although the application has been explained in detail with reference to the above embodiments, those ordinarily skilled in the art would appreciate that the technical solutions recorded in these embodiments can still be amended or part of the technical features in these embodiments can be equivalently substituted without causing the essence of corresponding technical solutions to deviate from the spirit and scope of the technical solutions of these embodiments.