CN114779973A - Touch reproduction structure, driving method thereof and touch device - Google Patents

Touch reproduction structure, driving method thereof and touch device Download PDF

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Publication number
CN114779973A
CN114779973A CN202210427317.8A CN202210427317A CN114779973A CN 114779973 A CN114779973 A CN 114779973A CN 202210427317 A CN202210427317 A CN 202210427317A CN 114779973 A CN114779973 A CN 114779973A
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magnetic
layer
touch
flexible film
substrate
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陈右儒
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BOE Technology Group Co Ltd
Beijing BOE Technology Development Co Ltd
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BOE Technology Group Co Ltd
Beijing BOE Technology Development Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04102—Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper

Abstract

The application discloses a touch sensation reproduction structure, a driving method thereof and a touch device, wherein the touch sensation reproduction structure comprises: a substrate base plate and an actuator connected with the substrate base plate. Wherein, the substrate base plate includes: the magnetic field generating structure is used for generating a magnetic field, and the magnetic field is used for controlling the arrangement of magnetic particles in the magnetic fluid so as to adjust the rigidity of the substrate; the actuator is used for generating standing waves and driving the substrate base plate to vibrate. The structure can realize the touch reappearance on the flexible substrate, can generate the deformation in the direction vertical to the touch surface, and effectively enriches the touch simulation function of the touch reappearance.

Description

Touch reproduction structure, driving method thereof and touch device
Technical Field
The present application relates to the field of touch technologies, and in particular, to a haptic display structure, a driving method thereof, and a touch device.
Background
The touch feedback technology is the key point of the modern science and technology development, and the concept of the technology is that through touch, the equipment terminal and a human body are interacted. Haptic feedback can be divided into two categories, vibration feedback and haptic rendering. The surface touch reappearance technology can sense the object characteristics by touching the screen with bare fingers, realizes high-efficiency natural interaction at the multimedia terminal, and has great research value, thereby gaining wide attention of researchers at home and abroad. In the physical sense, the surface touch refers to the effect of the roughness of the object surface and the skin (such as finger tip), and different friction forces are formed due to different surface structures. Therefore, by controlling the surface friction, simulation of different tactile senses or tactility can be achieved.
At present, a touch reappearing structure based on a squeeze film effect is widely applied to touch products, and the structure utilizes high-frequency vibration on the surface of a terminal and the surface of a finger to generate a high-pressure air film to change the friction force between the finger and the surface of the terminal, so that the surface touch simulation is realized. However, this structure is limited by the rigidity of the vibrating body, and is often used in products having a rigid substrate base such as a glass substrate, and it is difficult to satisfy the tactile reproduction requirements of flexible substrate products.
Disclosure of Invention
The application provides a touch reproduction structure, a driving method thereof and a touch device, which can effectively solve the problems.
In a first aspect, an embodiment of the present application provides a haptic rendering structure, including: substrate base plate and with the actuator of substrate base plate connection, wherein:
the substrate base plate includes: the magnetic substrate comprises a first flexible film layer, a second flexible film layer, a magnetic field generating structure and a magnetic fluid, wherein the first flexible film layer and the second flexible film layer are arranged oppositely, the magnetic fluid is filled in a cavity between the first flexible film layer and the second flexible film layer, the magnetic field generating structure is used for generating a magnetic field, and the magnetic field is used for controlling the arrangement of magnetic particles in the magnetic fluid so as to adjust the rigidity of the substrate;
the actuator is used for generating standing waves and driving the substrate base plate to vibrate.
Further, the magnetic field generating structure is disposed on a first surface of the first flexible film layer, and/or a second surface of the second flexible film layer, wherein the second surface is a surface opposite to the first surface.
Further, the magnetic field generating structure includes a first magnetic layer and a second magnetic layer, the first magnetic layer is disposed on a first surface of the first flexible film layer, the second magnetic layer is disposed on a second surface of the second flexible film layer, and magnetic poles of the first magnetic layer and the second magnetic layer are opposite.
Further, the first magnetic layer comprises a plurality of first magnetic units arranged at intervals, the second magnetic layer comprises a plurality of second magnetic units arranged at intervals, and each first magnetic unit at least partially overlaps with an orthographic projection of one second magnetic unit on the second flexible film layer.
Further, the magnetic field generating structure is an electromagnetic induction structure for generating the magnetic field upon energization.
Further, the electromagnetic induction structure comprises a magnetic material layer, an insulating layer and a conductive coil which are arranged in a stacked mode.
Further, the electromagnetic induction structure comprises a piezoelectric layer and a magnetostrictive material arranged on the piezoelectric layer.
Further, the actuator is arranged on the surface, far away from the magnetic fluid, of the first flexible film layer or the second flexible film layer and used for driving the substrate base plate to vibrate in the direction perpendicular to the surface of the substrate base plate.
Further, the substrate base plate further includes: a sealing layer disposed at a peripheral edge region between the first and second flexible film layers for forming a cavity therebetween for filling the magnetic fluid;
an orthographic projection of the actuator on the second flexible film layer is within an orthographic projection of the sealing layer on the second flexible film layer.
Further, the actuator is arranged on the side surface of the substrate base plate and used for driving the substrate base plate to vibrate along the direction parallel to the surface of the substrate base plate.
In a second aspect, an embodiment of the present application provides a driving method for a haptic reproduction structure, where the driving method is applied to the haptic reproduction structure described in the first aspect, and the method includes:
acquiring touch information of a user;
based on the touch information, a first drive signal is sent to the magnetic field generating structure to control the rigidity of the substrate base plate, and a second drive signal is sent to the actuator to control the vibration state of the substrate base plate.
In a third aspect, an embodiment of the present application provides a touch device, including a touch layer and the haptic rendering structure of the first aspect, where the touch layer is stacked on a substrate in the haptic rendering structure.
Further, the touch device further comprises a display structure, and the display structure is arranged between the touch layer and the substrate in a stacked mode.
The technical scheme provided by the embodiment of the application at least has the following technical effects or advantages:
the utility model provides a structure is reappeared to sense of touch, the structure of substrate base plate has been improved, has set up two-layer flexible rete, fills the magnetic current body between first flexible rete and second flexible rete, produces the distribution that magnetic field comes control magnetic current body magnetic particle in the structure through the magnetic field to adjust the rigidity of whole substrate base plate, on this basis, produce the standing wave through the actuator of connecting the substrate base plate, make the substrate base plate take place resonance. In this way, on one hand, the squeeze film effect can be adjusted by controlling the vibration of the actuator under the condition that the substrate base plate is adjusted to the required rigidity by driving the magnetic field generating structure, so as to control the friction force between the finger and the touch surface, thereby realizing the touch reproduction based on the flexible substrate; on the other hand, in the process that a user presses the touch surface, the rigidity of the substrate is controlled by the size of the magnetic field generated by the driving magnetic field generating structure, so that the substrate deforms in the direction perpendicular to the touch surface, touch simulation similar to the button pressing process is realized, the touch simulation function of the touch reproduction structure is effectively enriched, and more real touch experience is provided for the user.
The above description is only an overview of the technical solutions of the present application, and the present application may be implemented in accordance with the content of the description so as to make the technical means of the present application more clearly understood, and the detailed description of the present application will be given below in order to make the above and other objects, features, and advantages of the present application more clearly understood.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of an exemplary haptic rendering structure in an embodiment of the present application;
FIG. 2 is a schematic diagram of an exemplary electrically conductive coil in an embodiment of the present application;
FIG. 3 is a schematic diagram of another exemplary electrically conductive coil in an embodiment of the present application;
FIG. 4 is a schematic diagram of an exemplary magnetic induction structure in an embodiment of the present application;
FIG. 5 is a schematic diagram of another exemplary magnetic induction structure according to an embodiment of the present application;
FIG. 6 is a schematic view showing the arrangement of magnetic particles in the example of the present application;
FIG. 7 is a diagram illustrating the stress-deformation relationship of the substrate base plate under different Young's moduli in the embodiment of the present application;
FIG. 8 is a schematic diagram of another exemplary haptic rendering structure in an embodiment of the present application;
FIG. 9 is a flowchart of a method for driving a haptic rendering structure according to an embodiment of the present application;
FIG. 10 is a force analysis graph of a sliding touch behavior in an embodiment of the present application;
fig. 11 is a force analysis diagram of a pressing touch behavior in the embodiment of the present application.
Detailed Description
For the tactile reproduction structure based on the squeeze film effect, there is a certain requirement for the rigidity of the vibrator to form the squeeze film effect. Generally, the frequency at which the vibrating body resonates, i.e., the formula of the resonant frequency, is shown by the following equation:
Figure BDA0003608894480000041
in the formula (f)rRepresenting the resonance frequency, and λ representing the half wavelength of the haptic, i.e. the half wavelength of the standing wave generated by the actuator, GbRepresenting the stiffness of the vibrating body, MbRepresenting the mass of the vibrating body.
Since the human auditory sense is sensitive to the vibration less than 20kHz, the touch sense reproduction structure needs to make the resonant frequency f when designing the vibrationrGreater than 20 kHz. The flexible substrate is much less rigid than glass, e.g. glass in general>40GPa, while the stiffness of PI (polyimide) substrates is < 2 GPa. If the tactile reproduction structure uses a flexible substrate, the resonant frequency of the flexible substrate will be due to the stiffness GbIs reduced to be very small, and the flexible substrate is mostly a super elastomer, so that a good film pressing effect cannot be formed.
In view of this, an embodiment of the present application provides a haptic rendering structure, a driving method thereof, and a touch device, where the haptic rendering structure includes: a substrate base plate and an actuator connected with the substrate base plate, wherein: the substrate base plate includes: the magnetic field generating structure is used for generating a magnetic field, and the magnetic field is used for controlling the arrangement of magnetic particles in the magnetic fluid so as to adjust the rigidity of the substrate; the actuator is used to generate standing waves so that the substrate base plate resonates. Therefore, the influence of the rigidity of the flexible substrate on the resonant frequency can be effectively compensated by controlling the magnetic field generated by the magnetic field generating structure and adjusting the rigidity of the substrate base plate, so that the touch reproduction on the flexible substrate is realized. In addition, deformation in the direction perpendicular to the touch surface can be achieved by adjusting the rigidity of the substrate base plate, namely touch simulation similar to that when a button is pressed is achieved, the touch simulation function of the touch reproduction structure is effectively enriched, and more real touch experience is provided for a user.
Exemplary embodiments of a haptic reproduction structure and a driving method thereof, and a touch device provided by the present application will be described in detail below with reference to the accompanying drawings. It is noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. The term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. The term "plurality" includes two or more than two.
In a first aspect, an embodiment of the present application provides a haptic reproduction structure, as shown in fig. 1, including: a substrate 100, and an actuator 140 connected to the substrate 100. Wherein, the substrate base plate 100 includes: the magnetic field generating structure comprises a first flexible film layer 101, a second flexible film layer 102, a magnetic field generating structure 110 and a magnetic fluid 120.
Specifically, the first flexible film layer 101 is disposed opposite the second flexible film layer 102. For example, the first flexible film layer 101 and the second flexible film layer 102 may use a flexible thin film material such as PET (polyethylene terephthalate), PI, PDMS (polydimethylsiloxane) or PMMA (polymethyl methacrylate, also referred to as acrylic), which may be specifically determined according to the needs of the actual application scenario.
The magnetic field generating structure 110 may be disposed between the first flexible film layer 101 and the second flexible film layer 102, for example, may be disposed on a first surface of the first flexible film layer 101, and/or a second surface of the second flexible film layer 102, for ease of processing. Wherein the second surface is a surface opposite to the first surface.
In a specific structural aspect, for example, the magnetic field generating structure 110 may be an electromagnetic induction structure, and the electromagnetic control effect is achieved by generating a magnetic field through power application. It should be noted that, two electromagnetic induction structures capable of achieving the electromagnet control effect are mainly listed below, in other embodiments of the present application, other applicable electromagnetic induction structures may also be adopted, and this embodiment is not limited to this.
First, the electromagnetic induction structure may include a magnetic material layer, an insulating layer, and a conductive coil, which are stacked, similarly to the structure of the electromagnet. For example, a metal layer of a coil pattern may be formed on the insulating layer, i.e., a conductive coil may be formed, by a semiconductor processing process. As shown in fig. 2, the conductive coil has a first electrode end a and a second electrode end b, and when a current is applied to the first electrode end a and the second electrode end b, a magnetic field is generated around the coil, and the magnetic material is magnetized by the magnetic field, so that the generated magnetic field is superimposed on the magnetic field generated by the coil, and a magnetic field with a desired strength is obtained, as can be seen in the related art.
For example, the magnetic material layer may be made of cobalt iron silicon oxide (CoFeSiO) material, or other suitable magnetic materials such as NiZnCuFeO, coffefo, cofalo, baccofeo, and the like may be used. A magnetic field may be applied during processing to align the magnetic moments of the ferromagnetic material in a uniform direction.
The insulating layer may employ a dielectric material such as an oxide or a nitride, and for example, silicon dioxide (SiO2) or silicon nitride may be employed.
The conductive coil may be made of a metal material, such as copper or gold. Of course, other conductive materials used, such as Indium Tin Oxide (ITO), may also be used. For example, the wire coil may be a square coil as shown in fig. 2, or may be a circular coil as shown in fig. 3, and may be specifically designed according to actual needs, and may be powered on to generate a required magnetic field. It should be noted that the conductive coil shown in fig. 2 and 3 omits the width of the conductive wire 200.
Second, the electromagnetic induction structure may include a piezoelectric layer and a magnetostrictive material disposed on the piezoelectric layer. For example, the piezoelectric layer may include: an upper electrode, a lead zirconate titanate (PZT) film, and a lower electrode, which are stacked, and the magnetostrictive material may be: an array of nickel nanostructures exhibiting a single magnetic domain. The nickel nanostructure array of the single magnetic domain can generate a weak magnetic field, so that the energy of the single magnetic domain is changed; then, an electric field is formed by electrifying the upper electrode and the lower electrode of the piezoelectric layer, the electric field enables the lead zirconate titanate film to generate strain due to the piezoelectric effect, the strain is transmitted to the nickel nanostructure array through mechanical coupling, the magnetization state of the nickel nanostructure array is changed due to the inverse magnetostriction effect, the energy of a single magnetic domain is further changed, a weak magnetic field generated by the nickel nanostructure array is combined with the energy change of the single magnetic domain under the action of the electric field, a magnetic field with required strength can be generated, the magnetic pole can be controlled to turn over by changing the direction of the electric field, and the electromagnet control effect can be achieved. The mode can realize the nanometer-scale electromagnet, and is beneficial to reducing the thickness of the electromagnetic induction structure.
It will be appreciated that the magnetic field generating structure 110 needs to have two poles. In an alternative embodiment, the two poles may be distributed on the surface of different flexible film layers. For example, the magnetic field generating structure 110 includes a first magnetic layer disposed on a first surface of the first flexible film layer 101 and a second magnetic layer disposed on a second surface of the second flexible film layer 102, the first magnetic layer and the second magnetic layer having opposite magnetic poles.
Taking the first electromagnetic induction structure as an example, the magnetic pole direction can be controlled by changing the energizing direction, i.e. changing the current direction, for example, in the first magnetic layer, the first electrode terminal a is used as the positive pole, the second electrode terminal b is used as the negative pole, in the second magnetic layer, the first electrode terminal a is used as the negative pole, and the second electrode terminal b is used as the positive pole. Taking the second electromagnetic induction structure as an example, the magnetic pole direction can be controlled by changing the direction of the electric field, for example, in the first magnetic layer, the upper electrode is used as the positive pole, and the lower electrode is used as the negative pole, and in the second magnetic layer, the upper electrode is used as the negative pole, and the lower electrode is used as the positive pole.
Of course, in other embodiments of the present application, if the magnetic field generating structure 110 is disposed on the first surface of the first flexible film 101 or the second surface of the second flexible film 102, two magnetic poles are also distributed on the same flexible film, and the specific arrangement manner may be set according to the needs of an actual scene, which is not limited in this embodiment.
Further, in order to generate a relatively uniform magnetic field between the first flexible film layer 101 and the second flexible film layer 102 for convenient control, as shown in fig. 1, the first magnetic layer may include a plurality of first magnetic units 111 arranged at intervals, and correspondingly, the second magnetic layer includes a plurality of second magnetic units 112 arranged at intervals, and each first magnetic unit 111 is arranged opposite to one second magnetic unit 112 and at least partially overlaps with a forward projection on the second flexible film layer 102. It should be noted that the number of the magnetic units shown in fig. 1 is only an illustration and not a limitation, and the specific number and size of the magnetic units need to be determined according to the size of the substrate base plate 100 in the practical application scenario and the required magnetic field distribution, etc.
Since the magnetic poles of the first magnetic unit 111 and the second magnetic unit 112 are opposite and are arranged in pairs, a magnetic field can be formed between the two opposite magnetic poles. For example, the first magnetic layer includes M × N first magnetic cells 111 arranged in an array, and correspondingly, the second magnetic layer also includes M × N second magnetic cells 112 arranged in an array, and each first magnetic cell 111 is disposed opposite to one second magnetic cell 112.
In an alternative embodiment, the first magnetic units 111 and the second magnetic units 112 are arranged at the same position, size and distance, that is, each first magnetic unit 111 and the corresponding second magnetic unit 112 completely overlap with each other in the orthographic projection on the second flexible film layer 102, so that each pair of magnetic units generates a magnetic field perpendicular to the surface of the substrate 100.
It should be noted that the first magnetic unit 111 and the second magnetic unit 112 are identical in structure and material, and differ in that the directions of energization are opposite, so that the two magnetic units exhibit opposite magnetic poles. For example, as shown in fig. 4, for the first electromagnetic induction structure, the first magnetic unit 111 includes a first magnetic material layer 1110, a first insulating layer 1111, and a first conductive coil 1112, and the second magnetic unit 112 includes a second magnetic material layer 1120, a second insulating layer 1121, and a second conductive coil 1122. As shown in fig. 5, taking the second electromagnetic induction structure as an example, the first magnetic unit 111 includes: a first piezoelectric layer 1113, and a first magnetostrictive material 1114 disposed on the first piezoelectric layer 1113, the second magnetic unit 112 comprising: a second piezoelectric layer 1123 and a second magnetostrictive material 1124 disposed on the second piezoelectric layer 1123. The terms "first" and "second" are used only for distinguishing two kinds of magnetic units, and are not otherwise limited.
The magnetic fluid 120 is filled in the cavity between the first flexible film layer 101 and the second flexible film layer 102. It is understood that the magnetic fluid 120 is a colloidal solution, and is formed by coating a long-chain surfactant on the magnetic particles of nanometer order, and uniformly dispersing the surfactant in a base liquid. For example, the magnetic particles may be ferroferric oxide (Fe)3O4) The particles and the surfactant coated on the outer layer can be PMMA. The magnetic fluid 120 has no magnetic attraction force in a static state, and the magnetic particles 121 show magnetism under the action of an external magnetic field.
In use, the magnetic field generating structure 110 can control the opening and closing of the magnetic field and the magnitude of the generated magnetic field. In the magnetic field off state, the magnetic particles 121 in the magnetic fluid 120 are randomly distributed, as shown in (a) of fig. 6, and at this time, the young's modulus of the magnetic fluid 120 is small. In the on state of the magnetic field, the magnetic particles 121 distributed among different magnetic poles of the magnetic field generating structure 110 are arranged under the action of the magnetic field, as shown in (b) of fig. 6 (the direction of the dotted arrow in the figure represents the direction of the magnetic field), so that the arrangement density of the magnetic particles 121 is increased, and the young's modulus of the magnetic fluid 120 is correspondingly increased. The young's modulus measures the stiffness of an isotropic elastomer, and the young's modulus is elevated, i.e., the stiffness of the substrate base plate 100 is elevated. Therefore, by controlling the intensity of the magnetic field generated by the magnetic field generating structure 110, the arrangement of the magnetic particles 121 in the magnetic fluid 120 can be controlled, thereby adjusting the rigidity of the substrate 100.
Fig. 7 shows the corresponding relationship between the deformation and the stress of the substrate 100 under different young's moduli, where curve a represents the corresponding relationship between the deformation and the stress of the substrate 100 in the state of diagram (B) in fig. 6, and curve B represents the corresponding relationship between the deformation and the stress of the substrate 100 in the state of diagram (a) in fig. 6. Comparing curves a and B, it can be seen that the smaller the young's modulus, the larger the strain that occurs when subjected to the same stress. Therefore, by controlling the magnetic field generated by the magnetic field generating structure 110 and adjusting the young's modulus of the magnetic fluid 120 in the substrate base plate 100, it is possible to realize the simulation of the pressing touch feeling of objects having different rigidity characteristics.
Further, in order to encapsulate the magnetic fluid 120 between the first flexible film layer 101 and the second flexible film layer 102, the substrate base plate 100 further includes: and a sealing layer 130. A sealing layer 130 is disposed at the peripheral edge region between the first and second flexible film layers 101 and 102 for forming a cavity between the first and second flexible film layers 101 and 102 to fill the magnetic fluid 120. For example, the sealant layer 130 may be formed by curing a sealant material.
The actuator 140 is used to generate standing waves to drive the substrate 100 to vibrate. For example, the actuator 140 may be a piezoelectric element including a first electrode layer 141, a piezoelectric material film 142, and a second electrode layer 143, which are stacked. The piezoelectric material film 142 has a piezoelectric effect, and a voltage is applied to the first electrode layer 141 and the second electrode layer 143, so that an electric field generated by the voltage acts on the piezoelectric material film 142, and the piezoelectric material film 142 is deformed. The higher the applied electric field strength, the greater the amplitude of vibration of the piezoelectric material film 142. Therefore, by controlling the voltage applied to the actuator 140, the vibration frequency and amplitude of the piezoelectric material film 142 can be controlled, and a standing wave with a specified waveform is formed, which drives the substrate 100 to vibrate.
Specifically, the actuator 140 may be disposed vertically or horizontally with respect to the surface of the substrate 100, which is not limited in this embodiment.
Wherein, the vertical setting specifically is: the actuator 140 is disposed on a surface of the first flexible film layer 101 or the second flexible film layer 102 away from the magnetic fluid 120, and is used for driving the substrate 100 to vibrate in a direction perpendicular to the surface of the substrate 100. It is understood that, in order to implement the touch function, a touch layer is stacked on the substrate 100 for a specific application. At this time, as an embodiment, in order to avoid affecting the touch effect, the actuator 140 and the touch layer may be separately disposed on different surfaces of the substrate 100, and if the actuator 140 is disposed on the surface of the first flexible film layer 101 away from the magnetic fluid 120, the touch layer may be disposed on the surface of the second flexible film layer 102 away from the magnetic fluid 120. As another embodiment, the actuator 140 may be disposed in a frame region of the substrate base plate 100, for example, an orthogonal projection of the actuator 140 on the second flexible film layer 102 is located within an orthogonal projection of the sealing layer 130 on the second flexible film layer 102. At this time, the actuator 140 may be arbitrarily disposed on the surface of the first flexible film layer 101 or the second flexible film layer 102 away from the magnetic fluid 120.
The horizontal setting is specifically as follows: the actuator 140 is disposed on a side of the substrate 100, as shown in fig. 8, and is used for driving the substrate 100 to vibrate in a direction parallel to the surface of the substrate 100.
When the flexible film laminating device is used, the substrate base plate 100 is adjusted to the specified rigidity by controlling the size of the magnetic field generated by the magnetic field generating structure 110, so that the problem that a good film laminating effect cannot be formed due to too low rigidity of a flexible substrate such as a PI film can be effectively solved. Wherein the specified stiffness is determined according to the requirements of the actual use scenario. On the basis, by controlling the voltage applied to the actuator 140, the vibration frequency of the substrate 100 is adjusted to adjust the magnitude of the friction of the touch surface, so that the user can feel a predetermined tactile sensation on the touch surface.
Therefore, in the structure for reproducing tactile sensation provided by the embodiment, when the young modulus of the magnetic fluid 120 filled between the two flexible film layers is increased, the rigidity of the whole substrate 100 can be increased, and the left shift (reduction) of the resonance frequency caused by too low rigidity of the flexible substrate can be improved, so that a good film pressing effect can be formed on the flexible substrate, and the tactile sensation can be reproduced. In addition, in the process that the user slides and touches the touch surface, the young modulus of the magnetic fluid 120 filled between the two flexible film layers is reduced, so that the vibration damping of the substrate base plate 100 can be increased, the rapid vibration stopping is realized, the touch contrast of the finger of the user in the sliding process of the touch surface is favorably improved, and the more real touch experience is provided.
In addition, when the young's modulus of the magnetic fluid 120 filled between the two flexible film layers is reduced, the stiffness of the whole substrate 100 can be reduced, so that when a user presses the touch surface, the substrate 100 can generate deformation in the direction perpendicular to the touch surface, touch simulation similar to button pressing is realized, the touch simulation function of a touch reproduction structure is effectively enriched, and more real touch experience is provided for the user.
In a second aspect, an embodiment of the present application provides a driving method for a haptic reproduction structure, which is applied to the haptic reproduction structure provided in the first aspect. As shown in fig. 9, the method includes the steps of:
step S101, acquiring touch information of a user;
step S102, based on the touch information, sending a first driving signal to the magnetic field generating structure to control the stiffness of the substrate base plate, and sending a second driving signal to the actuator to control the vibration state of the substrate base plate.
When the touch screen is used specifically, when a user touches the touch surface, the touch information of the user can be acquired through the touch layer. The touch information includes a touch position of the user on the touch surface, and the type of the touch behavior of the user can be determined by recognizing the touch position. For example, the touch behavior types may include a slide touch and a press touch.
In this case, the sliding touch is that the finger of the user slides on the touch surface, and at this time, a texture touch simulation of the touched object needs to be provided for the user. As shown in FIG. 10, when the touch surface 300 slides at a speed v in the direction of the arrow, the user's finger will be subjected to a lateral friction parallel to the touch surface 300 and a positive force F perpendicular to the touch surface 300nThe lateral friction force includes a friction force F parallel to the sliding directiontAnd a frictional force F perpendicular to the sliding directiono. By controlling the vibration of the substrate 100, the squeeze film effect and beat between the finger and the touch surface 300 can be adjustedThe click effect forms a counter acting force, so that the surface friction force is controlled, and simulation of different touch senses or tactile senses in a sliding touch scene can be realized.
The press touch is a press operation performed by a user on the touch surface. For example, as shown in fig. 11, when the object to be subjected to the tactile sensation simulation is the button 400, it can be known from mechanical analysis that the user presses the button 400, and the force applied during the pressing of the button 400 by the user increases with the increase of the deformation of the button, then decreases with the increase of the deformation, and exhibits the negative stiffness characteristic, and finally increases with the increase of the deformation. Therefore, when a user performs a pressing touch action on the touch surface, if the pressed object is an object with elasticity, such as a button or other soft material, the stiffness characteristic of the substrate 100 needs to be adjusted, so that the substrate 100 deforms in a direction perpendicular to the touch surface, thereby providing a relatively real pressing touch feeling for the user.
For the sliding touch behavior, on one hand, the stiffness of the substrate 100 corresponding to the specified tactile sensation needs to be predetermined, so that the first driving signal sent to the magnetic field generating structure 110 is needed to make the substrate 100 achieve the specified stiffness. On the other hand, it is also necessary to determine in advance the vibration state of the base substrate 100 corresponding to the above-described specified tactile sensation, thereby determining the second drive signal that needs to be sent to the actuator 140. Thus, when it is recognized that the user has a sliding touch behavior, the substrate 100 can be adjusted to a specific stiffness by sending a predetermined first driving signal to the magnetic field generating structure 110, and a predetermined second driving signal to the actuator 140, so that the substrate 100 exhibits a specific vibration frequency, thereby realizing a simulation of a specific tactile sensation on the touch surface.
For the pressing touch behavior, a first driving signal that needs to be sent to the magnetic field generating structure 110 to simulate the stiffness characteristic may be determined according to the stiffness characteristic of the object corresponding to the touch position, that is, the corresponding relationship between the deformation and the stress that occurs when the object is pressed. When it is recognized that the user has a pressing touch behavior, the substrate 100 may be adjusted to have a corresponding stiffness characteristic by sending a predetermined first driving signal to the magnetic field generating structure 110 without controlling the substrate 100 to vibrate, so that the pressing position is deformed in a direction perpendicular to the touch surface, and a relatively real pressing touch feeling is provided for the user.
In a third aspect, an embodiment of the present application further provides a touch device, including: the touch layer and the tactile sense reproduction structure provided by the first aspect are stacked on the substrate 100 in the tactile sense reproduction structure.
The touch layer is used to implement a touch function of the touch device, and the specific structure may be designed according to actual requirements, for example, the specific structure may be a capacitive touch layer, a resistive touch layer, or an infrared touch layer, which is not limited in this embodiment. For example, the capacitive touch layer may include touch driving electrodes, touch sensing electrodes, touch traces, and the like.
For example, the touch device may be a touch panel, a touch display panel, a terminal device with a touch panel, such as a virtual reality device or a touch screen display device, and the like, which is not limited in this embodiment.
It is understood that when the touch device is a device further having a display function, the touch device further includes a display structure, and the display structure is stacked between the touch layer and the substrate 100 of the haptic reproduction structure. The display structure is used for realizing a display function, and for example, the display structure may include a pixel unit and the like, and the specific configuration may be referred to in the related art and is not described in detail herein.
In the above description, details of the techniques such as patterning of the layers of the product are not described in detail. It will be appreciated by those skilled in the art that layers, regions, etc. of the desired shape may be formed by various technical means. In addition, in order to form the same structure, those skilled in the art can also design a method which is not exactly the same as the method described above. Although the embodiments are described separately above, this does not mean that the measures in the embodiments cannot be used in advantageous combination.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Additionally, one of ordinary skill in the art will understand that: the discussion of any embodiment above is merely exemplary and is not intended to suggest that the scope of the disclosure is limited to these examples; features from the above embodiments, or from different embodiments, may also be combined, steps may be implemented in any order, and there are many other variations of the different aspects of one or more embodiments of the present description, as described above, which are not provided in detail for the sake of brevity.
While preferred embodiments of the present specification have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the specification.

Claims (13)

1. A tactile sensation reproduction structure, comprising: substrate base plate and with the actuator of substrate base plate connection, wherein:
the substrate base plate includes: the magnetic substrate comprises a first flexible film layer, a second flexible film layer, a magnetic field generating structure and a magnetic fluid, wherein the first flexible film layer and the second flexible film layer are arranged oppositely, the magnetic fluid is filled in a cavity between the first flexible film layer and the second flexible film layer, the magnetic field generating structure is used for generating a magnetic field, and the magnetic field is used for controlling the arrangement of magnetic particles in the magnetic fluid so as to adjust the rigidity of the substrate;
the actuator is used for generating standing waves and driving the substrate base plate to vibrate.
2. A tactile representation according to claim 1, wherein the magnetic field generating structure is provided on a first surface of the first flexible film layer and/or on a second surface of the second flexible film layer, wherein the second surface is the opposite surface to the first surface.
3. A tactile reproduction structure according to claim 1, wherein the magnetic field generation structure comprises a first magnetic layer disposed on a first surface of the first flexible film layer and a second magnetic layer disposed on a second surface of the second flexible film layer, the first magnetic layer having a magnetic polarity opposite to that of the second magnetic layer.
4. A tactile representation structure according to claim 3, wherein the first magnetic layer comprises a plurality of first magnetic elements spaced apart and the second magnetic layer comprises a plurality of second magnetic elements spaced apart, each first magnetic element at least partially overlapping an orthographic projection of one second magnetic element on the second flexible film layer.
5. A tactile representation according to claim 1, wherein said magnetic field generating structure is an electromagnetic induction structure for generating said magnetic field upon application of an electric current.
6. A tactile representation according to claim 5, wherein the electromagnetic induction structure comprises a layer of magnetic material, an insulating layer and a conductive coil arranged in a stack.
7. A tactile reproduction structure according to claim 5, characterized in that the electromagnetic induction structure comprises a piezoelectric layer and a magnetostrictive material arranged on the piezoelectric layer.
8. A tactile reproduction structure according to claim 1, wherein the actuator is disposed on a surface of the first flexible film layer or the second flexible film layer remote from the magnetic fluid for driving the substrate base plate to vibrate in a direction perpendicular to the surface of the substrate base plate.
9. A tactile reproduction structure according to claim 8, wherein the substrate base further comprises: a sealing layer disposed at a peripheral edge region between the first and second flexible film layers for forming a cavity therebetween for filling the magnetic fluid;
an orthographic projection of the actuator on the second flexible film layer is within an orthographic projection of the sealing layer on the second flexible film layer.
10. A tactile representation according to claim 1, wherein the actuator is arranged on a side of the substrate for driving the substrate to vibrate in a direction parallel to the surface of the substrate.
11. A method for driving a tactile sensation reproducing structure, applied to the tactile sensation reproducing structure according to any one of claims 1 to 10, the method comprising:
acquiring touch information of a user;
based on the touch information, sending a first drive signal to a magnetic field generating structure to control the stiffness of a substrate base plate, and sending a second drive signal to an actuator to control the vibration state of the substrate base plate.
12. A touch device comprising a touch layer and the tactile reproduction structure of any of claims 1-10, the touch layer laminated to a substrate in the tactile reproduction structure.
13. The touch device of claim 12, further comprising a display structure stacked between the touch layer and the substrate.
CN202210427317.8A 2022-04-21 2022-04-21 Touch reproduction structure, driving method thereof and touch device Pending CN114779973A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210427317.8A CN114779973A (en) 2022-04-21 2022-04-21 Touch reproduction structure, driving method thereof and touch device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210427317.8A CN114779973A (en) 2022-04-21 2022-04-21 Touch reproduction structure, driving method thereof and touch device

Publications (1)

Publication Number Publication Date
CN114779973A true CN114779973A (en) 2022-07-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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