WO2021092785A1

WO2021092785A1 - Tactile feedback module, touch screen, keyboard, and electronic device

Info

Publication number: WO2021092785A1
Application number: PCT/CN2019/117870
Authority: WO
Inventors: 张学强; 于国华
Original assignee: 南昌欧菲显示科技有限公司
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2021-05-20

Abstract

A tactile feedback module comprises at least two stacked elasticity control elements. The elasticity control element comprises a first conductive electrode layer, a substrate, a second conductive electrode layer, and an elastic layer that are sequentially stacked. Elastic layers and first conductive electrode layers in adjacent elasticity control elements overlap. The elastic layer comprises mutually independent cylindrical elastic bodies. Driving signals having different polarities are respectively inputted to the first conductive electrode layer and the second conductive electrode layer in the elasticity control unit, such that when the tactile feedback module senses a touch pressure, the cylindrical elastic bodies generate vibration feedback under the action of an electric field force. The need for a substrate between the two conductive electrode layers in the elasticity control element is eliminated, thereby improving a tactile feedback effect of the tactile feedback module. A driving voltage needed to be applied to generate the same feeling of vibration is reduced, thereby facilitating energy conservation and design of a driving circuit.

Description

Tactile feedback module, touch screen, keyboard and electronic device

Technical field

This application relates to the technical field of tactile feedback, in particular to a tactile feedback module, a touch screen, a keyboard, and an electronic device.

Background technique

With the rapid development of smart products, various smart terminal products appear in people's daily lives, and touch input devices are one of the key components of various smart terminal products, and their touch performance has become one of the focuses of people's attention.

However, traditional touch products generally do not have the function of tactile feedback, and people cannot feel obvious tactile feedback when touching the touch product, so they cannot perceive whether the touch input action is effective through tactile feedback.

Summary of the invention

According to various embodiments of the present application, a tactile feedback module, a touch screen, a keyboard, and an electronic device are provided.

A tactile feedback module, characterized in that it comprises at least two laminated elastic force control elements; the elastic force control element includes a first conductive electrode layer, a substrate, a second conductive electrode layer, and an elastic layer that are sequentially stacked. The elastic layer includes mutually independent columnar elastic bodies; wherein, the elastic layer in the adjacent elastic force control element is adjacent to the first conductive electrode layer, any elastic layer and its upper and lower adjacent second conductive electrode layers and the first conductive electrode The three layers together form an elastic force control unit; by respectively inputting drive signals of different polarities to the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit, the tactile feedback module can sense the touch pressure , The columnar elastic body generates vibration feedback under the action of the electric field force.

A touch screen includes the tactile feedback module according to any one of the embodiments of the present application, which is used for when the tactile feedback module senses a touch pressure, the columnar elastic body vibrates under the action of an electric field force Feedback.

A keyboard includes a button, the button adopts the tactile feedback module according to any one of the embodiments of the present application, and is used for when the button senses a touch pressure, the columnar elastic body is subjected to electric field force. Vibration feedback is generated under the action.

An electronic device, including the tactile feedback module according to any one of the embodiments of the present application, is used for when the tactile feedback module senses a touch pressure, the columnar elastic body is under the action of electric field force. Generate vibration feedback.

In the above-mentioned tactile feedback module, the elastic force control element is arranged in the form of a first conductive electrode layer, a substrate, a second conductive electrode layer and an elastic layer stacked in sequence, and then at least two layers of elastic force control elements are stacked to form a tactile feedback A module, wherein the elastic layer in the adjacent elastic force control element is adjacent to the first conductive electrode layer, and any elastic layer and its upper and lower adjacent second conductive electrode layers and the first conductive electrode layer together form an elastic force control unit. The columnar elastic body is located in the capacitance sensor formed between the first conductive electrode layer and the second conductive electrode layer that are adjacent to each other. The first conductive electrode layer and the second conductive electrode layer in the elastic force control unit are inputted differently. The driving signal of the polarity enables the cylindrical elastic body to generate vibration feedback under the action of the electric field force when the tactile feedback module senses the touch pressure. Since the base material is omitted between the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit in the tactile feedback module, the distance between the first conductive electrode layer and the second conductive electrode layer is reduced, The electric field force received by the cylindrical elastic body in the elastic force control unit under the same conditions is increased, the vibration intensity of the cylindrical elastic body is increased, and the haptic feedback effect of the haptic feedback module is improved, or when the same vibration sensation is generated The driving voltage that needs to be applied is reduced, which is conducive to energy saving and the design of the driving circuit.

The details of one or more embodiments of the present application are set forth in the following drawings and description. Other features, purposes and advantages of this application will become apparent from the description, drawings and claims.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. Those of ordinary skill in the art can also obtain drawings of other embodiments based on these drawings without creative work.

FIG. 1 is a schematic diagram of the structure of the elastic force control element in the tactile feedback module in the first embodiment of the application.

FIG. 2 is a schematic diagram of the structure of the tactile feedback module in the second embodiment of the application.

3 is a schematic diagram of the structure of the tactile feedback module in the third embodiment of the application.

4 is a schematic diagram of the structure of the tactile feedback module in the fourth embodiment of the application.

FIG. 5 is a schematic diagram of driving signals of the tactile feedback module in an embodiment of the application.

6a-6c are schematic diagrams of the dynamic changes of the columnar elastic body under the action of the driving signal in FIG. 5.

FIG. 7 is a schematic diagram of the structure of the keyboard in an embodiment of the application.

Detailed ways

In order to facilitate the understanding of the application, the application will be described in a more comprehensive manner with reference to the relevant drawings. The preferred embodiments of the application are shown in the accompanying drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of this application more thorough and comprehensive.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terms used in the specification of the application herein are only for the purpose of describing specific embodiments, and are not intended to limit the application. The term "and/or" as used herein includes any and all combinations of one or more related listed items.

When describing the positional relationship, unless otherwise specified, when an element such as a layer, film or substrate is referred to as being "on" another film layer, it can be directly on the other film layer or an intermediate film layer may also be present. Furthermore, when a layer is referred to as being "under" another layer, it can be directly underneath, or there may be one or more intermediate layers. It is also understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present. The "upper" and "lower" mentioned in this application refer to the degree of proximity of the product to the user during the application process. The side relatively close to the user is referred to as "up", and the side relatively far away from the user is referred to as "down". ".

In the case of using the "including", "having" and "including" described herein, unless a clearly defined term is used, such as "only", "consisting of", etc., another component may be added. Unless mentioned to the contrary, terms in the singular form may include the plural form and cannot be understood as the number of which is one.

It should be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the present application, the first element may be referred to as the second element, and similarly, the second element may be referred to as the first element.

In the description of this application, it should be noted that the terms "installation", "connection", and "connection" should be interpreted broadly unless otherwise clearly specified and limited. For example, it can be a fixed connection or a detachable connection. , Or integrally connected; it can be a direct connection, or an indirect connection through an intermediate medium, or a connection between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood under specific circumstances.

In addition, in the description of the present application, unless otherwise specified, "several", "superimposed", "stacked", "stacked", "mutually" or "mutually" means two or more.

One aspect of the present application provides a tactile feedback module, which includes at least two layers of laminated elasticity control elements; the elasticity control element includes a first conductive electrode layer, a substrate, a second conductive electrode layer, and an elastic layer that are sequentially stacked. The elastic layer includes mutually independent columnar elastic bodies; wherein the elastic layer in the adjacent elastic force control element is adjacent to the first conductive electrode layer, and any elastic layer and its upper and lower adjacent second conductive electrode layers are connected to the first conductive electrode layer. The three electrode layers together form an elasticity control unit. By respectively inputting drive signals of different polarities to the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit, when the tactile feedback module senses the touch pressure, the cylindrical elastic body is generated under the action of the electric field force. Vibration feedback.

In the tactile feedback module in the above embodiment, the elasticity control element is configured to include the first conductive electrode layer, the base material, the second conductive electrode layer, and the elastic layer stacked in sequence, and then at least two layers of elasticity control The elements are stacked to form a tactile feedback module, wherein the elastic layer in the adjacent elastic force control element is adjacent to the first conductive electrode layer, any elastic layer and its upper and lower adjacent second conductive electrode layers and first conductive electrode layers The three together form an elastic force control unit; the elastic layer includes mutually independent columnar elastic bodies. Since the columnar elastic body in the elastic force control unit is located in the capacitive sensor formed between the first conductive electrode layer and the second conductive electrode layer, the advantage that the columnar elastic body can easily undergo elastic deformation and vibration under force is used, By respectively inputting drive signals of different polarities to the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit, when the tactile feedback module senses the touch pressure, the cylindrical elastic body is generated under the action of the electric field force. Vibration feedback. Since the base material is omitted between the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit in the tactile feedback module, the distance between the first conductive electrode layer and the second conductive electrode layer is reduced, The electric field force received by the columnar elastic body between the first conductive electrode layer and the second conductive electrode layer under the same conditions is increased, the vibration intensity of the columnar elastic body is improved, and the haptic feedback effect of the haptic feedback module is improved ; Or the driving voltage that needs to be applied is reduced when the same vibration sense is produced, which is conducive to energy saving and the design of the driving circuit.

Further, in the above embodiment, the columnar elastic bodies are uniformly arranged in an array. The columnar elastic body is located in the capacitance sensor formed between the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit. Taking the cylindrical structure of the elastic body as an example, the contact surface between the cylindrical elastic body and the upper conductive electrode layer is circular. According to the pressure formula P=F/S, under the same applied force, the greater the contact surface S, the greater the pressure P The smaller the size, the less easily the elastic body is deformed. Therefore, the smaller the capacitance change rate of the capacitive sensor, the lower the pressure sensitivity sensitivity. The columnar elastic body is used to reduce the top contact area. Under the same force, the contact surface S decreases and the pressure P increases. The elastic body is more easily deformed, the capacitance change rate of the capacitance sensor increases, and the pressure sensitivity sensitivity improve. Therefore, the use of mutually independent columnar elastic bodies in the elastic layer improves the pressure detection sensitivity of the tactile feedback module compared to the use of full-surface elastic bodies.

In an embodiment of the present application, a plurality of elastic force control elements are overlapped with each other to form a laminated structure, and adjacent elastic force control elements are overlapped and connected. The elastic layer in the elastic force control element is laminated and connected with the second conductive electrode, and the connection method of the elastic layer and the second conductive electrode layer in the elastic force control element can be adhesive bonding, preferably double-sided adhesive and/or water glue . Adhesive adhesive can be used to bond adjacent elastic force control elements, preferably double-sided adhesive and/or water adhesive. The fixed connection product structure design can avoid the separation of product components during the use of the product and reduce the service life of the product, and the fixed structure can also enhance the vibration feeling. In this embodiment, a non-conductive material is preferably used for the user contact surface to provide insulation and protection, and at the same time, it can be separated from the outside air to avoid electrode oxidation and play a role in waterproofing and avoiding.

In an embodiment of the present application, the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit are respectively connected to the first electrode lead-out end and the second electrode lead-out end. The first electrode leading end is distributed on one side of the tactile feedback module, and the second electrode leading end is distributed on the other side of the tactile feedback module. In this embodiment, the first electrode lead-out terminal and the second electrode lead-out terminal can be respectively input with positive and negative voltages. In some other embodiments of the present application, the first electrode lead-out end and the second electrode lead-out end may be connected to a non-zero voltage and ground, respectively.

Further, in the tactile feedback module in the above embodiment, the first electrode lead-out terminal in the elastic force control unit can share a first signal input terminal, and the second electrode lead-out terminal in the elastic force control unit can share a second signal The input terminal, through the first signal input terminal and the second signal input terminal, can input driving voltage signals of different polarities to the elastic force control unit. Preferably, the first signal input terminal and the second signal input terminal may be connected to a non-zero voltage and ground, respectively. Such a design can not only effectively reduce the number of terminals for driving signal input, but also effectively reduce the process flow of the product and reduce the complexity of the product structure.

Specifically, in the tactile feedback module in the above embodiment, a capacitance sensor is formed between the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit, which can sense the pressure signal applied thereto. Any elastic force control unit in the tactile feedback module includes a first conductive electrode layer, a second conductive electrode layer, and an elastic layer located between the first conductive electrode layer and the second conductive electrode layer. The elastic layer includes mutually independent columns. Elastomer, and there is no substrate between the first conductive electrode layer and the second conductive electrode layer. The electric field force in the capacitive sensor F=(U ² *K*εr*S1)/(d ² *Y*S2), where U is the driving voltage applied to both ends of the product, K is the electrostatic force constant, and εr is the laminate The total dielectric constant of the material, S1 is the effective area of the electric field, d is the distance between the two conductive electrode layers, Y is the elastic modulus of the columnar elastic body, and S2 is the cross-sectional area of the columnar elastic body. The magnitude of the electric field force is inversely proportional to the square of the distance between the two conductive electrode layers. Under the same conditions, if the distance between the two conductive electrode layers in the elastic force control unit can be reduced, the magnitude of the electric field force received by the columnar elastic body in the elastic force control unit under the same conditions can be effectively increased. In the embodiment of the present application, since the base material is omitted between the first conductive electrode layer and the second conductive electrode layer in any elastic force control unit in the tactile feedback module, the elastic force control unit is effectively reduced. The distance between the two conductive electrode layers effectively increases the electric field force received by the columnar elastic body in the elastic force control unit under the same conditions. Under the same conditions, the vibration effect of the columnar elastic body in the elastic control unit is better, which improves the tactile feedback effect of the tactile feedback module; the driving voltage that needs to be applied is reduced under the same vibration feeling, which is beneficial to energy saving and driving Circuit design; as the number of layers of the substrate in the tactile feedback module is reduced, the thickness of the tactile feedback module is effectively reduced.

Specifically, in the tactile feedback module in the above-mentioned embodiment, the columnar elastic body is located in the capacitive sensor formed between the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit, and can contribute to the elastic force control unit The first conductive electrode layer and the second conductive electrode layer in can be applied with driving signals of different polarities. When the finger touches the tactile feedback module, the columnar elastic body is compressed, and the distance between the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit becomes smaller. When the columnar elastic body deforms the most, the two layers of electrodes The adsorption force between them is also the largest, and the compressed cylindrical elastic body receives the largest electric field force. The compressed cylindrical elastic body rebounds to a state of uncompressed deformation, and the feeling that is fed back to the hand is tactile feedback. Using the keyboard of the tactile feedback module, the tactile feedback module in an embodiment of the present application can be used for one button, and each button is connected to the corresponding electrode lead-out terminal for inputting different frequencies and/or The driving signal of amplitude enables each key to be inputted with driving voltage signals of different frequencies and/or amplitudes according to different experience requirements of the user during use, so as to obtain different tactile feedback effects.

Further, in the tactile feedback module in the above embodiment, the electrode array of the first conductive electrode layer or the electrode array of the second conductive electrode layer in the elastic force control unit may consist of a plurality of independent strip electrodes, or It is composed of multiple chains connected with multiple electrode blocks or independent block electrodes. The orthographic projection of the electrode array of the first conductive electrode layer and the electrode array of the second conductive electrode layer in the horizontal plane has a certain area of intersection area, thereby forming a number of capacitive sensors.

Further, in the tactile feedback module in the foregoing embodiment, any one of the first conductive electrode layer or the second conductive electrode layer may be composed of a transparent conductive material, such as ITO, ZnO, carbon nanotubes, graphene, etc.; It can be made of non-transparent conductive materials. At this time, it is necessary to control the size of the conductive material to realize that the human eyes are not affected by these conductive electrode layers when observing the display content of the product using the tactile feedback module. The aforementioned conductive material may be selected from conductive materials such as silver paste, carbon paste, nano silver wire, PEDOT, carbon nanotube, or graphene.

Further, in the tactile feedback module in the foregoing embodiment, the material used for the elastic layer may be silicone rubber, acrylate elastomer, polyurethane elastomer, nitrile rubber, vinylidene fluorinated trifluoroethylene and their corresponding At least one of organic-inorganic and organic-organic composite materials. The elastic layer can be optically transparent in a macroscopic view, allowing light to pass through, and on the premise of not obstructing the content display, "transparent" can be understood as "transparent" and "substantially transparent" in this application.

Further, in the tactile feedback module in the above embodiment, the substrate can be composed of an independent transparent or opaque film, and the film can be made of polyimide (PI), polyethylene terephthalate (Polyethylene terephthalate). It is made of at least one of materials such as terephalate (PET) and polyethylene naphthalate (PEN). In this embodiment, the substrate is preferably made of a flexible material.

In the tactile feedback module in the above embodiment, the columnar elastic body in the elastic layer will generate corresponding elastic compression according to the pressure information of the touch and the touch position when the surface of the tactile feedback module is touched and pressed, and will be removed when the touch is pressed. The back elastic layer can be restored to the original state or close to the original state. When the tactile feedback module receives touch pressure, at the position where the force is applied, the distance between the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit is reduced due to the compression of the columnar elastic body, and its The degree of reduction is related to the pressure applied. Therefore, when the tactile feedback module receives a touch pressure, the capacitance between the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit changes, so that the columnar elastic body in the elastic force control unit is under the action of the electric field force. Vibration makes the user feel tactile feedback.

An embodiment of the present application provides an electronic device, which includes any tactile feedback module provided in the embodiments of the present application. When the tactile feedback module senses the touch pressure, the columnar elastic body vibrates under the action of the electric field force, so that the vibration is fed back to the user who touches and presses the button.

In one embodiment of the present application, a keyboard is provided, which includes any of the tactile feedback modules described in the embodiments of the present application, the tactile feedback module is used for keys, and when the keys are sensed touch pressure The columnar elastic body vibrates under the action of the electric field force, so that the vibration is fed back to the user who touches the button.

Specifically, a tactile feedback module can be used as a key in the keyboard, and different keys can be applied with different driving voltages, so that the user can obtain different vibration feedback effects when pressing different keys.

In one embodiment of the present application, a touch screen is provided. The touch screen adopts the tactile feedback module according to any one of the embodiments of the present application. The elastic body generates vibration feedback under the action of electric field force.

Hereinafter, some embodiments and working principles of the present application will be further described with reference to the accompanying drawings.

As shown in FIG. 1, a schematic structural diagram of an elastic force control element 10 in a tactile feedback module provided in an embodiment of the present application. The elastic force control element 10 includes a first conductive electrode layer 11, a base material 12, a second conductive electrode layer 13, and an elastic layer 14 which are sequentially stacked. The substrate 12 is located between the first conductive electrode layer 11 and the second conductive electrode layer 13. The elastic layer 14 is connected to the second conductive electrode layer 13 and is preferably bonded with an adhesive, and the adhesive is preferably a double-sided adhesive and/or a water-based adhesive. The elastic layer 14 includes columnar elastic bodies 141 independent of each other. A tactile feedback module is formed by superimposing at least two elastic force control elements 10 as shown in FIG. 1 on each other. In the adjacent elastic force control elements 10 in the tactile feedback module, the elastic layer 14 of the upper elastic force control element 10 and the lower elastic force The first conductive electrode layer 12 of the control element 10 is superimposed on each other, that is, the elastic layer 14 in the adjacent elastic force control element 10 is adjacent to the first conductive electrode layer 11, and any elastic layer 14 and its upper and lower adjacent second elastic layers 14 are adjacent to each other. The conductive electrode layer 13 and the first conductive electrode layer 11 together form an elastic force control unit. The elasticity control unit includes an elastic layer 14 between the first conductive electrode layer 11 and the second conductive electrode layer 13, wherein the columnar elastic body 141 in the elastic layer 14 is formed between the first conductive electrode layer 11 and the second conductive electrode layer 13 In the capacitive sensor, changing the frequency and/or amplitude of the driving signal input to the elastic force control unit can change the vibration intensity of the cylindrical elastic body in the elastic force control unit, thereby changing the tactile feedback effect of the tactile feedback module. By applying driving signals of different polarities to the first conductive electrode layer 11 and the second conductive electrode layer 13 in the elastic force control unit in the haptic feedback module, the haptic feedback module is shaped like a column when it senses a touch pressure. The elastic body 141 generates vibration feedback under the action of the electric field force.

FIG. 2 is a schematic structural diagram of a tactile feedback module provided in an embodiment of the application. The tactile feedback module includes at least two laminated elastic force control elements 10 as shown in FIG. 1. The elastic force control element 10 includes a first conductive electrode layer 11, a base material 12, a second conductive electrode layer 13, and an elastic layer 14 which are sequentially stacked. The elastic layer 14 in any elastic force control element 10 is connected to the second conductive electrode layer 13, preferably by bonding, and double-sided tape and/or water glue may be used for bonding. The elastic layer 14 includes columnar elastic bodies 141 independent of each other. The elastic layer 14 in the adjacent elastic force control element 10 is adjacent to the first conductive electrode layer 11, and any elastic layer 14 and its upper and lower adjacent second conductive electrode layers 13 and the first conductive electrode layer 11 together form an elastic force. Control unit 20. The columnar elastic body 141 in the elastic layer 14 in the tactile feedback module is located in the capacitive sensor formed by the first conductive electrode layer 11 and the second conductive electrode layer 13 in the elastic force control element 10. By applying driving signals of different polarities to the first conductive electrode layer 11 and the second conductive electrode layer 13 in the tactile feedback module, respectively, the cylindrical elastic body 141 is in the position when the tactile feedback module senses the touch pressure. Vibration feedback is generated under the action of electric field force.

In the tactile feedback module in the above embodiment, since only the elastic layer is included between the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit, it is avoided that the first conductive electrode layer and the second conductive electrode layer are formed between the first conductive electrode layer and the second conductive electrode layer. The introduction of the base material between, effectively reduces the distance between the first conductive electrode layer and the second conductive electrode layer. Since the square value of the spacing is inversely proportional to the magnitude of the electric field force in the capacitive sensor formed between the first conductive electrode layer and the second conductive electrode layer, reducing the spacing can effectively improve the capacitive sensing under the same conditions. The magnitude of the electric field force in the sensor improves the vibration effect of the cylindrical elastic body located in the capacitive sensor, thereby improving the tactile feedback effect of the tactile feedback module. The multi-layer stacking design of the tactile feedback module makes the vibrations of the columnar elastic bodies in the multi-layer elastic layers superimpose each other, which can produce resonance effects, which further improves the tactile feedback effect of the tactile feedback module; or produces the same sense of vibration In this case, the driving voltage that needs to be applied is reduced, which is conducive to energy saving and the design of the driving circuit. In the tactile feedback module, since the number of layers of the substrate is reduced, the thickness of the product is effectively reduced.

FIG. 3 is a schematic structural diagram of a tactile feedback module provided in an embodiment of the application. The difference from the tactile feedback module shown in FIG. 2 is that the first conductive electrode layer 11 in the elastic force control unit 20 is respectively connected The first electrode leading end 15 and the second conductive electrode layer 13 in the elastic force control unit 20 are respectively connected to the second electrode leading end 16. The first electrode leading end 15 is distributed on one side of the tactile feedback module, and the second electrode leading end 16 is distributed on the other side of the tactile feedback module. In this embodiment, the first electrode lead-out terminal 15 and the second electrode lead-out terminal 16 can be respectively input with positive and negative voltages. In some other embodiments of the present application, the first electrode lead-out end 15 and the second electrode lead-out end 16 may be connected to a non-zero voltage and ground, respectively.

In the tactile feedback module in the above embodiment, since the first conductive electrode layer in the elastic force control unit is connected to the first electrode lead-out terminal, respectively, the second conductive electrode layer in the elastic force control unit is respectively connected to the second electrode lead-out terminal , And the first electrode lead-out end and the second electrode lead-out end are respectively located on both sides of the tactile feedback module, so that driving signals of different polarities can be input to the tactile feedback module through the first electrode lead-out end and the second electrode lead-out end , So that the columnar elastic body in the elastic force control unit is located in the capacitance sensor formed between the first conductive electrode layer 11 and the second conductive electrode layer 13 in the elastic force control unit 20, and the columnar elastic body 141 in the elastic force control unit 20 Vibrate under the action of electric field force, and then produce the effect of tactile feedback. The vibration effects of the columnar elastic bodies in the multi-layer elastic layer are superimposed on each other, which can produce a resonance effect, and further improve the tactile feedback effect of the tactile feedback module.

4 is a schematic structural diagram of a tactile feedback module provided in an embodiment of this application. The difference from the tactile feedback module shown in FIG. 3 is that the first conductive electrode layer in the elastic control unit shares the same first A signal input terminal 21, the second conductive electrode layer in the elastic force control element shares the same second signal input terminal 22. The first signal input terminal 21 and the second signal input terminal 22 are used for inputting driving signals of different polarities. In the embodiment of the present application, preferably, the second signal input terminal 22 is input with a non-zero signal, and the first signal input terminal 21 is grounded.

In the tactile feedback module in the above embodiment, since the first conductive electrode layer in the elastic force control unit shares the same first signal input terminal, the second conductive electrode layer in the elastic force control unit shares the same second signal At the input terminal, the drive signal can be input to the elastic force control unit through the first signal input terminal and the second signal input terminal, and the column shape of the elastic force control unit can be changed by changing the frequency and/or amplitude of the drive signal input to the elastic force control unit The vibration intensity of the elastic body changes the tactile feedback effect of the tactile feedback module. The vibration effects of the columnar elastic bodies in the multi-layer elastic layer are superimposed on each other, which can produce a resonance effect, and further improve the tactile feedback effect of the tactile feedback module.

Further, in the tactile feedback module in the above embodiment, adjacent elastic force control elements are overlapped and connected to form a fixed integrated structure. Adjacent elasticity control elements can be glued with glue, preferably double-sided glue and/or water glue. The fixed integrated structure design can avoid the separation of product components during the vibration process of the product and reduce the service life of the product, and the fixed structure can also enhance the vibration feeling. In this embodiment, a non-conductive material is preferably used for the contact surface of the tactile feedback module with the user to provide insulation and protection, and at the same time, it can be separated from the outside air to avoid oxidation of the electrode and play a role in waterproofing.

FIG. 5 is a schematic diagram of a driving voltage signal provided in an embodiment of the application. By inputting the driving voltage signal shown in FIG. 5 to the second signal input terminal shown in FIG. 4, the first signal input terminal is grounded. The driving voltage signal shown in Fig. 5 is a unipolar triangular wave periodic signal, and the frequency can be about 20Hz-200Hz. This frequency is the frequency of simulating the use of a traditional keyboard, such as a mechanical keyboard. The driving voltage signal shown in Figure 5 is divided into four different control sampling points in one cycle, and the operating modes of the tactile feedback module under different driving voltages are briefly described at different control sampling points. The sampling moments of the sampling points are respectively Recorded as T1, T2, T3, and T4.

6a, 6b, and 6c are all transient schematic diagrams of the dynamic change of the columnar elastic body under the action of the driving signal in FIG. 5. Figure 6a shows the initial state of the cylindrical elastic body; Figure 6b shows that when the electric field force is maximum, the cylindrical elastic body undergoes the maximum electric field force and produces the greatest elastic deformation; Figure 6c shows that the electric field force gradually decreases and the cylindrical elastic body relies on its own rebound The force slowly rebounds to its original state. The working principle of the tactile feedback module in the embodiment of the present application will be briefly described below in conjunction with FIG. 6a, FIG. 6b, and FIG. 6c.

In the process of T1-T2 state: at time T1, the columnar elastic body shape is shown in Figure 6a, and it does not change to the original state; at time T1-T2, the electric field force gradually increases, and the electrostatic adsorption force between the two conductive electrode layers gradually Increase, produce a gradually increasing electric field force on the cylindrical elastic body; at T2, the electric field force is the largest, and the adsorption force between the two conductive electrode layers is also the largest. At this time, the deformation of the cylindrical elastic body is also the largest, as shown in Figure 6b. .

During the T2-T3 state: from T2 to T3, the electric field force gradually decreases, and the adsorption force between the two conductive electrode layers also gradually decreases. The columnar elastic body slowly rebounds according to its own rebound force; At time T3 of the driving signal, the columnar elastic body rebounds to the original state, as shown in the state shown in Fig. 6c.

During the T3-T4 state process: T3 to T4, the driving input signal is basically 0, and there is basically no electric field force between the two conductive electrode layers, so there is no electrostatic adsorption force, and the columnar elastic body maintains its original state.

The driving signal includes a periodically changing signal shown between T1-T4. The frequency of the driving signal shown in FIG. 5 is preferably 50 Hz. In an embodiment, the frequency of the input signal may be 20 Hz-200 Hz, or According to different user needs, input driving signals of different frequencies. For example, if the user wants to experience a stronger vibration sensation, the signal frequency or amplitude can be increased. The input signal changes periodically, and the columnar elastic body changes periodically from 0 to the maximum deformation. The feeling that is fed back to the user's hand is tactile feedback.

FIG. 7 is a schematic diagram of the structure of the keyboard in an embodiment of the application, in which a single key can adopt the tactile feedback module as shown in FIG. 4. As shown in the keyboard shown in Fig. 7, each button 40 is connected to the corresponding signal input terminal and input different driving signals respectively, so that each button can be inputted with different frequency and/or according to the different needs of the user during the use process. Drive voltage signal of amplitude to obtain different tactile feedback effects.

In the tactile feedback module in the above embodiments, the first conductive electrode layer and/or the second conductive electrode layer can be made on a transparent or opaque substrate by sputtering, evaporation, printing, etc., such as polyterephthalic acid On film materials such as plastic (Polyethylene terephthalate, PET), polycarbonate (PC) or glass. The electrode pattern of the conductive electrode layer can be obtained by etching of indium tin oxide conductive film (ITO film), screen printing conductive paste on PET, or by using a metal wire mesh (Metal wire mesh) process.

In this application, the elastic force control element is arranged in a form including a first conductive electrode layer, a substrate, a second conductive electrode layer, and an elastic layer that are sequentially stacked, and then at least two layers of elastic force control elements are stacked to form a tactile feedback module, wherein , The elastic layer in the adjacent elastic force control element is adjacent to the first conductive electrode layer, and any elastic layer and its upper and lower adjacent second conductive electrode layers and the first conductive electrode layer together form an elastic force control unit. Since the columnar elastic body is located in the capacitance sensor formed between the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit, the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit are respectively connected to the first conductive electrode layer and the second conductive electrode layer. Inputting drive signals of different polarities, so that when the tactile feedback module senses the touch pressure, the cylindrical elastic body generates vibration feedback under the action of the electric field force. Since the base material is omitted between the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit in the tactile feedback module, the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit are reduced The distance between the two increases the electric field force received by the columnar elastic body in the elastic force control unit under the same conditions, improves the vibration intensity of the columnar elastic body, and further improves the tactile feedback effect of the tactile feedback module. The haptic feedback module adopts a multi-layer laminated design. The vibration effects of the columnar elastic bodies in the multilayer elastic layer are superimposed on each other, which can generate resonance effects, which further improves the haptic feedback effect of the haptic feedback module; In this case, the driving voltage that needs to be applied is reduced, which is beneficial to energy saving and the design of the driving circuit; as the number of layers of the substrate is reduced, the thickness of the product is effectively reduced.

The keyboard using the tactile feedback module described in the embodiments of the present application subverts the structural design of the traditional key-type keyboard, and has many advantages such as thin thickness, bendable, no key gap, beautiful appearance, and good tactile feedback effect.

In an embodiment of the present application, the electronic device provided may be a smart watch, a mobile phone camera, a tablet computer camera, an electronic skin, a smart wearable device, etc., and an electronic device using the tactile feedback module described in the embodiment of the present application , Has a good tactile feedback effect.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered as the scope of this specification.

The above-mentioned embodiments only express several implementation manners of the present application, and their description is relatively specific and detailed, but they should not be understood as a limitation on the scope of the patent application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can be made, and these all fall within the protection scope of this application. Therefore, the scope of protection of the patent of this application shall be subject to the appended claims.

Claims

A tactile feedback module, characterized in that it comprises at least two laminated elastic force control elements; the elastic force control element includes a first conductive electrode layer, a substrate, a second conductive electrode layer, and an elastic layer that are sequentially stacked. The elastic layer includes mutually independent columnar elastic bodies; wherein, the elastic layer in the adjacent elastic force control element is adjacent to the first conductive electrode layer, any elastic layer and its upper and lower adjacent second conductive electrode layers and the first conductive electrode The three layers together form an elastic force control unit; by respectively inputting drive signals of different polarities to the first conductive electrode layer and the second conductive electrode layer in the elastic force control unit, the tactile feedback module can sense the touch pressure , The columnar elastic body generates vibration feedback under the action of the electric field force.
The tactile feedback module according to claim 1, wherein the first conductive electrode layer and the second conductive electrode layer in the elastic force control element are respectively connected to the first electrode lead-out end and the second electrode lead-out end.
The tactile feedback module according to claim 2, wherein the first electrode leading end is distributed on one side of the tactile feedback module, and the second electrode leading end is distributed on the tactile feedback module On the other side.
The tactile feedback module according to claim 1, wherein the first conductive electrode layer shares the same first signal input terminal, and the second conductive electrode layer shares the same second signal input terminal.
4. The tactile feedback module according to claim 4, wherein the first signal input terminal is grounded, and the second signal input terminal inputs a driving signal.
The tactile feedback module according to any one of claims 1-5, wherein: adjacent elastic control elements are superimposed and connected; wherein, the elastic layer in any elastic control element is connected to the second The conductive electrodes are laminated and connected.
The tactile feedback module according to any one of claims 1 to 5, wherein the columnar elastic bodies in the elastic layer are arranged in a uniform array.
A touch screen, comprising the tactile feedback module according to any one of claims 1-7, for when the tactile feedback module senses a touch pressure, the columnar elastic body is Vibration feedback is generated under the action of force.
A keyboard, characterized in that it comprises a button, the button adopts the tactile feedback module according to any one of claims 1-7, and is used for when the button senses a touch pressure, the columnar elastic The body produces vibration feedback under the action of electric field force.
An electronic device, comprising the tactile feedback module according to any one of claims 1-7, for when the tactile feedback module senses a touch pressure, the columnar elastic body is Vibration feedback is generated under the action of electric field force.