CN112860049A - Tactile feedback module, thin film keyboard and electronic device - Google Patents

Abstract

The application relates to a tactile feedback module, a thin film keyboard and an electronic device, wherein the tactile feedback module comprises at least two layers of stacked conductive films; the conductive film comprises a thin film insulating layer, a conductive electrode layer and an elastic layer which are sequentially stacked; the elastic layer comprises columnar elastic bodies which are mutually independent, and the diameters of the columnar elastic bodies distributed in different areas in the elastic layer in the orthographic projection of the horizontal plane are different; the thin film insulating layer of one of the adjacent conductive films is adjacent to the elastic layer of the other conductive film. By utilizing the advantage that the columnar elastic body can easily generate elastic deformation and generate vibration under stress, the diameters of the columnar elastic bodies distributed in different areas in the elastic layer are set to be different in the tactile feedback module, so that fingers can obtain uniform reaction force at different contact positions, and the tactile feedback uniformity of a user is improved; the structural design of the laminated conductive film effectively reduces the thickness of the product.

Description

Tactile feedback module, thin film keyboard and electronic device

Technical Field

The present application relates to the field of haptic feedback technologies, and in particular, to a haptic feedback module, a thin film keyboard and an electronic device.

Background

With the rapid development of internet technology, various keyboards are appearing in people's daily life. The keyboard is mainly a rubber film keyboard and comprises an elastic mechanism, a surface key frame and a key cap, wherein the key cap and the key frame are used for protecting the elastic mechanism. The contact of the elastic mechanism is composed of three layers of plastic films which are overlapped together, wherein the upper layer of plastic film and the lower layer of plastic film are respectively covered with a film wire, and the positions of the key contacts of the upper layer of plastic film and the lower layer of plastic film are respectively provided with a contact; the middle layer of plastic film does not contain a wire, a round hole is arranged at the position of the key contact, and the middle layer is used for insulating and separating the upper and lower layers of conductive films. Under normal conditions, the upper and lower two-layer conductive film is separated by the intermediate layer and can not be conducted, and the upper layer film can be communicated with the lower layer film at the position of the hole after being pressed, so that a key electric signal is generated.

The thickness and flexibility of the traditional keyboard are difficult to further optimize due to the structure and materials of the traditional keyboard, different vibration senses are difficult to generate at different contact points according with the arc shape of fingers, the fingers obtain basically same reaction forces at different contact positions, and the uniformity sense of the touch feedback is poor.

Disclosure of Invention

Accordingly, there is a need for a haptic feedback module, a membrane keyboard and an electronic device, which at least partially solve one of the problems of the related art.

One aspect of the present application provides a haptic feedback module including at least two stacked conductive films;

the conductive film comprises a film insulating layer, an elastic layer and a conductive electrode layer, wherein the film insulating layer and the elastic layer are sequentially stacked;

the elastic layer comprises columnar elastic bodies which are mutually independent, and the diameters of the columnar elastic bodies distributed in different areas in the elastic layer are different;

wherein the thin film insulating layer of one of the adjacent conductive films is adjacent to the elastic layer of the other conductive film. According to the touch feedback module, the advantages that the elastic body can easily generate elastic deformation and generate vibration under stress are utilized, and the diameters of the columnar elastic bodies distributed in different areas in the elastic layer are set to be different in the touch feedback module, so that different contact positions of fingers obtain uniform reaction force, and the touch feedback uniformity of a user is improved; the structural design of the laminated conductive film effectively reduces the thickness of the product.

In one embodiment, the diameter of the columnar elastic body in the middle of the elastic layer is different from the diameter of the columnar elastic body in the periphery of the elastic layer.

In one embodiment, the diameter of the columnar elastic body in the middle of the elastic layer is smaller than the diameter of the columnar elastic body in the periphery of the elastic layer.

In one embodiment, the elastic layer has a thickness of 30um to 50 um.

In one embodiment, the conductive electrode layer has a thickness of 10um-50 μm.

In one embodiment, the number of conductive films is 2-40.

In one embodiment, the adjacent conductive electrode layers are respectively pulled out of electrode terminals for inputting voltage signals with different polarities.

In one embodiment, the voltage signal is a triangular wave voltage signal.

In one embodiment, the conductive electrode layer is respectively connected with the elastic layer and the insulating layer in an overlapping manner; the adjacent conductive films are connected in an overlapping manner.

An aspect of the application provides a membrane keyboard, including according to the haptic feedback module in any one of the embodiments of the application, the haptic feedback module is used for the button, when the button sensing touches the pressure, the columnar elastic body produces vibration feedback because of under the effect of electric field force.

An aspect of the application provides an electronic device comprising a haptic feedback module according to any one of the embodiments of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain drawings of other embodiments based on these drawings without any creative effort.

FIG. 1 is a schematic diagram of a conductive film in a haptic feedback module according to an embodiment of the present application.

FIG. 2 is a schematic representation of the diameter distribution of a columnar elastomer in an elastic layer according to one embodiment of the present application.

Fig. 3 is an enlarged view of a portion a in fig. 2.

FIG. 4 is a diagram illustrating a haptic feedback module in accordance with an embodiment of the present application.

FIG. 5 is a schematic diagram of a haptic feedback module in another embodiment of the present application.

FIG. 6 is a diagram illustrating driving signals of a haptic feedback module in accordance with an embodiment of the present application.

Fig. 7 a-7 c are dynamic transient diagrams of the columnar elastic body under the action of the driving signal illustrated in fig. 5.

Fig. 8 is a schematic structural diagram of a membrane keyboard according to an embodiment of the present application.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In describing positional relationships, 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 intervening film layers may also be present. Further, when a layer is referred to as being "under" another layer, it can be directly under, or one or more intervening layers may also be present. It will also be 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 terms "upper" and "lower" are used herein to refer to the side of the product that is relatively close to the user as "upper" and the side that is relatively far from the user as "lower" relative to the extent to which the product is close to the user during application.

Where the terms "comprising," "having," and "including" are used herein, another element may be added unless an explicit limitation is used, such as "only," "consisting of … …," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.

Throughout the description of the present application, it is to be noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection may be direct or indirect via an intermediate medium, and the connection may be internal to the two components. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified and defined, the term "diameter" is a diameter of an orthographic projection of the plane of the conductive electrode layer.

In addition, in the description of the present application, the meaning of "several", "stacked", "laminated", "each other" or "each other" is two or more unless otherwise specified.

One aspect of the present application provides a haptic feedback module, including at least two stacked conductive films, each conductive film including a thin film insulating layer, an elastic layer, and a conductive electrode layer between the thin film insulating layer and the elastic layer, which are sequentially stacked; the elastic layer comprises columnar elastic bodies which are independent of each other; the diameters of the columnar elastic bodies distributed in different areas in the elastic layer are different; the thin film insulating layer of one of the adjacent conductive films is adjacent to the elastic layer of the other conductive film. Through the voltage signal of applying different polarity to the conductive electrode layer in the adjacent conducting film for tactile feedback module is when the sensing touches pressure, and the columnar elastomer in the elastic layer produces vibration feedback because of under the effect of electric field force.

According to the touch feedback module, the advantages that the columnar elastic bodies can easily generate elastic deformation and generate vibration under stress are utilized, and the diameters of the columnar elastic bodies distributed in different areas in the elastic layer are set to be different in the touch feedback module, so that fingers can obtain uniform reaction force at different contact positions, and the touch feedback uniformity feeling of a user is improved; the structural design of the laminated conductive film effectively reduces the thickness of the product.

Further, in the above embodiments, the columnar elastic bodies are arranged in an array. The columnar elastic body is positioned in the capacitance inductor formed by the upper conductive electrode layer and the lower conductive electrode layer. Taking the elastic body as an example of a cylindrical structure, the contact surface between the cylindrical elastic body and the upper conductive electrode layer is circular, and according to the pressure formula P ═ F/S, under the condition of the same applied force, the larger the contact surface S, the smaller the pressure P, the more the elastic body is not easily deformed, and therefore, the smaller the capacitance change rate of the capacitance sensor is, the lower the pressure sensing sensitivity is. The columnar elastic body is adopted, the contact area of the top end is reduced, the contact surface S is reduced under the condition of the same force application, the pressure intensity P is increased, the elastic body is more easily deformed, the capacitance change rate of the capacitance sensor is increased, and the pressure sensing sensitivity is improved. Therefore, the elastic layer adopts the mutually independent columnar elastic bodies, and compared with the elastic body with the whole surface, the pressure detection sensitivity of the touch feedback module is improved.

In one embodiment of the present application, a plurality of conductive films are stacked on one another to form a stacked structure, the total thickness of the stacked structure may be 0.1mm to 1mm, the thickness of any one of the conductive films used to form the stacked structure may be 0.1mm, the thickness of the elastic layer in the conductive film may be 30um to 50um, and the thickness of the conductive electrode layer in the conductive film may be 10um to 50 μm. In one embodiment, the number of conductive films included in the stacked structure may be 2-40 layers. The conductive electrode layer is respectively connected with the elastic layer and the film insulating layer which are adjacent up and down in an overlapped mode; the adjacent conductive films are connected in an overlapping manner. The connection mode of the conductive electrode layer and the elastic layer can be bonding by using adhesive, and preferably double-faced adhesive and/or water adhesive are used. The adjacent conductive films can be adhered by using adhesive, and preferably double-faced adhesive and/or water adhesive are adopted. The product structural design of fixed connection can avoid the product in the use vibration process, causes the product part separation and reduces the life of product, and fixed knot constructs can also strengthen the sense of shaking. Use non-conductive material with user's contact surface in the tactile feedback module to play insulating protection, can separate with the outside air simultaneously, avoid the electrode oxidation, and can play waterproof evasion effect.

In one embodiment of the present application, adjacent conductive electrode layers respectively pull out electrode terminals for inputting voltage signals of different polarities. In this embodiment, the electrode terminals of the adjacent conductive electrode layers can be respectively inputted with positive and negative voltages. In another embodiment, the electrode terminals in adjacent conductive electrode layers may be connected to a non-zero voltage and ground, respectively. The haptic feedback module in this embodiment may be configured as a single key, and if there are multiple keys, one haptic feedback module may be used for each key.

In particular, in the haptic feedback module of the above embodiments, a capacitance sensor is formed between two adjacent conductive electrode layers, and can sense a pressure signal applied thereto. The capacitance inductor comprises an upper conductive electrode layer, a lower conductive electrode layer and an elastic layer positioned between the upper conductive electrode layer and the lower conductive electrode layer, wherein the elastic layer comprises mutually independent columnar elastic bodies, and the diameters of the columnar elastic bodies distributed in different areas in the elastic layer are different. Because the fingers have arc-shaped surfaces, when the fingers are pressed on the product, the fingers do not touchThe tactile sensation obtained is different from that obtained at the same position. In a capacitive sensor, the electric field force F ═ U²*K*εr*S₁)/(d²*Y*S₂) Wherein U is the driving voltage applied to both ends of the product, K is the constant of the electrostatic force, ε r is the total dielectric constant of the laminated material, and S₁D is the distance between two conductive electrode layers, Y is the elastic modulus of the columnar elastomer, S₂The cross section area of the columnar elastic body is the same, the diameter of the columnar elastic body is designed into different forms according to the areas, after a driving signal is input between the adjacent conductive electrode layers, the electric field force applied to the columnar elastic body in different areas is different, and the vibration effect of the columnar elastic body is different. Through designing different diameters of the columnar elastic bodies in different areas in the elastic layer, when the tactile feedback module is actually touched and pressed by fingers, the tactile feedback vibration sense obtained at different contact positions is uniform.

Specifically, in the tactile feedback module in the above embodiment, the diameters of the columnar elastic bodies distributed in different areas in the elastic layer are different, when a finger touches and presses the capacitance sensor formed between the adjacent conductive electrode layers, the columnar elastic body located in the capacitance sensor is compressed, the distance between the adjacent conductive electrode layers is reduced, when the deformation of the columnar elastic body is maximum, the adsorption force between the adjacent conductive electrode layers is also maximum, the electric field force received by the compressed columnar elastic body is maximum, the compressed columnar elastic body rebounds to a non-compression deformation state, and the tactile feedback is given to the hand. The keyboard using the tactile feedback module can adopt one tactile feedback module for each key, and each key respectively pulls out the corresponding electrode and respectively inputs different driving signals, so that different driving voltages can be input according to the experience requirements of a user in the use process of each key, and different tactile feedbacks can be obtained.

Further, in the haptic feedback module in the above embodiments, the conductive electrode layer may be made of a transparent conductive material, such as ITO, ZnO, carbon nanotube, graphene, etc.; the tactile feedback module can also be made of non-transparent conductive materials, and the size of the conductive materials is controlled so that the display content of a product using the tactile feedback module can be observed by human eyes without being influenced by the conductive electrode layers. The conductive material can be selected from silver paste, carbon paste, nano silver wire, PEDOT, carbon nanotube or graphene and other conductive materials.

Further, in the haptic feedback module in the above embodiments, the conductive electrode layer may include a conductive electrode or an electrode array. In the adjacent conductive electrode layers, the electrode array of the upper conductive electrode layer and the electrode array of the lower conductive electrode layer may be formed by a plurality of mutually independent strip electrodes, or a plurality of chains connected with a plurality of electrode blocks, or mutually independent block electrodes. The electrode array of the upper conductive electrode layer and the electrode array of the lower conductive electrode layer have cross areas with certain areas in the orthographic projection of the electrode array of the upper conductive electrode layer and the electrode array of the lower conductive electrode layer in the plane of the elastic layer, so that a plurality of capacitance sensors are formed.

Further, in the haptic feedback module in the above embodiments, the material used for the elastic layer may be at least one of silicone rubber, acrylate elastomer, polyurethane elastomer, nitrile rubber, vinylidene fluoride trifluoroethylene, and their corresponding organic-inorganic, organic-organic composite materials. The elastic layer may be optically transparent on a macroscopic level, allowing light to pass through, and "transparent" is understood herein to mean "transparent" and "substantially transparent" without obstructing the display of the contents.

Further, in the tactile feedback module of the above embodiments, the thin film insulation layer may be formed by a separate transparent or opaque thin film, and the thin film may be made of at least one of Polyimide (PI), Polyethylene terephthalate (PET), Polyethylene Naphthalate (PEN), and the like. In this embodiment, the thin film insulating layer is preferably made of a flexible material. The number of conductive films constituting the laminated structure in the haptic feedback module is preferably 2 to 40.

In one embodiment of the present application, a thin film keyboard is provided, including any of the haptic feedback modules described in the embodiments of the present application, wherein the haptic feedback module is used for a key to sense a touch pressure inch, and the columnar elastic body vibrates under the action of an electric field force, so that the vibration is fed back to a user touching the key.

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

In one embodiment, an electronic device is provided that includes any of the haptic feedback modules provided in embodiments of the present application. When the touch feedback module senses the touch pressure inch, the columnar elastic body generates vibration under the action of the electric field force, so that the vibration is fed back to a user touching and pressing the key.

The following description of some embodiments and the working principle of the present application will be made with reference to the accompanying drawings.

As shown in fig. 1, a schematic structural diagram of a conductive film in a haptic feedback module provided in an embodiment of the present application includes a thin film insulating layer 11, an elastic layer 12, and a conductive electrode layer 13, which are sequentially stacked, wherein the conductive electrode layer 13 is located between the thin film insulating layer 11 and the elastic layer 12; the conductive electrode layer 13 includes a conductive electrode (not shown) which is drawn out of the electrode lead 14; the elastic layer 12 includes columnar elastic bodies 121 independent of each other; the diameters of the columnar elastic bodies 121 distributed in different areas in the elastic layer 12 are different, so that the reaction forces obtained when different parts of the fingers, which are in contact with the touch surface, are in contact with each other are consistent, the uniformity of the tactile feedback feeling is improved, and the actual requirement of the finger contact pressure is met. In one embodiment of the present application, the diameter distribution of the columnar elastic bodies 121 in the central region 122 of the elastic layer 12 is different from the diameter distribution of the columnar elastic bodies 121 in the peripheral region 123, for example, the diameter of the columnar elastic bodies 121 in the central region 122 of the elastic layer 12 is smaller than the diameter of the columnar elastic bodies 121 in the peripheral region 123. In the present embodiment, the thickness of the elastic layer 12 in the conductive film may be 30um to 50um, and the thickness of the conductive electrode layer 13 in the conductive film may be 10um to 50 μm.

Fig. 2 is a schematic structural diagram of an elastic layer in a conductive film according to an embodiment of the present invention, in which the elastic layer 12 includes a plurality of mutually independent columnar elastic bodies 121, and preferably, the columnar elastic bodies 121 are distributed in an array on the elastic layer 12. The diameters of the columnar elastic bodies 121 distributed in different regions of the elastic layer 12 are different, and a partially enlarged schematic view of a region a in a dashed line frame is shown in fig. 3.

Fig. 3 is a partially enlarged schematic view of the region of the elastic layer a in fig. 2, as shown in fig. 3, in an embodiment of the present application, the diameter distribution of the columnar elastic bodies 121 may be in a form gradually increasing from the middle to the periphery of the elastic layer, for example, the diameter of the columnar elastic body 121 in the middle of the elastic layer may be 0.06mm, the diameter of the columnar elastic body 121 may gradually increase by 0.01mm from the middle to the periphery of the elastic layer, the specific diameter distribution of the columnar elastic body 121 may refer to fig. 3, and the diameters of the columnar elastic bodies distributed from the middle region to the periphery of the elastic layer may be sequentially: 0.0600mm, 0.0700mm, 0.0800mm, 0.0900mm, 0.1000mm, 0.1100mm and 0.1200 mm. The diameter distribution of the columnar elastic bodies 121 in the elastic layer is in a form of uniform arrangement distribution. The specific value of the diameter in this embodiment is not limited to that described in this application, and may be designed into a form in which the columnar elastic bodies distributed in different areas correspond to different diameter values according to the requirement of the actual user experience.

Fig. 4 is a schematic structural diagram of a haptic feedback module according to an embodiment of the present application, including a conductive film 10 forming a laminated structure, where the conductive film 10 is as shown in fig. 1, that is, includes a thin film insulating layer 11, an elastic layer 12, and a conductive electrode layer 13, the conductive electrode layer 13 is located between the thin film insulating layer 11 and the elastic layer 12, a conductive electrode pull-out electrode terminal 14 in the conductive electrode layer 13, the elastic layer 12 includes columnar elastic bodies 121 independent of each other, and diameters of the columnar elastic bodies 121 distributed in different areas in the elastic layer 12 are different, so that different portions of a finger contacting a touch surface obtain a same reaction force when the key is pressed, and uniformity of a haptic feedback feeling is improved, so as to meet actual requirements of finger touch pressure. The number of conductive films 10 included in the laminated structure may be 6 to 10. In the conductive film 10, the conductive electrode layer is laminated with the elastic layer and the thin film insulating layer, and may be bonded with an adhesive, preferably double-sided adhesive and/or water adhesive.

Fig. 5 is a schematic structural diagram of a haptic feedback module according to an embodiment of the present invention, in the conductive films 10 forming the stacked structure, the adjacent conductive films 10 are in contact connection to form a fixed integral structure, and the electrode terminals 14 in the adjacent conductive electrode layers can be respectively formed on the left and right sides of the haptic feedback module to facilitate inputting of driving signals. The adjacent conductive films can be adhered by using adhesive, and preferably double-faced adhesive and/or water adhesive are adopted. The design of a fixed integral structure can avoid the product from separating parts and shortening the service life of the product in the use vibration process, and the fixed structure can also enhance the vibration sense. In this embodiment, the upper surface of the tactile feedback module and the user contact surface are made of non-conductive materials, so as to play an insulating protection role, and simultaneously, the tactile feedback module can be separated from the outside air, so that the electrode oxidation is avoided, and a waterproof evasion role can be played.

FIG. 6 is a diagram illustrating driving signals of a haptic feedback module in accordance with an embodiment of the present application. The electrode leading-out terminals extending from the two sides of the tactile feedback module illustrated in fig. 5 can be used as the positive and negative electrode input terminals respectively to input the driving test signal. The driving signal illustrated in fig. 6 is a unipolar triangular wave periodic signal, and the frequency may be about 20Hz to 200Hz, which is a frequency simulating the use of a conventional keyboard, such as a mechanical keyboard. In fig. 6, the input signal is divided into four different control sampling points within a period, the working states of the haptic feedback module under different driving voltages are briefly described at the different control sampling points, and the sampling times of the sampling points are respectively recorded as T1, T2, T3 and T4.

Fig. 7a, 7b and 7c are schematic dynamic transient diagrams of the pillar-shaped elastic body under the action of the driving signal in fig. 6, respectively. FIG. 7a illustrates an initial state of a columnar elastic body; FIG. 7b is a diagram illustrating that when the electric field force is the maximum, the elastic deformation of the columnar elastic body is the maximum when the columnar elastic body is subjected to the maximum electric field force; fig. 7c illustrates that the electric field force gradually decreases and the columnar elastic body slowly rebounds to the original state by virtue of the rebound force of the columnar elastic body. The operation of the haptic feedback module in the embodiment of the present application will be briefly described below with reference to fig. 7a, 7b and 7 c.

During the T1-T2 state: at time T1, the columnar elastic body is not deformed to its original state as shown in fig. 7 a; at the time of T1-T2, the electric field force is gradually increased, the electrostatic adsorption force between adjacent conductive electrode layers is gradually increased, and gradually increased electric field acting force is generated on the columnar elastic body; at time T2, the electric field force is maximized, the adsorption force between adjacent conductive electrode layers is maximized, and the deformation amount of the columnar elastic body is maximized, as shown in fig. 7 b.

During the T2-T3 state: at the time from T2 to T3, the electric field force is gradually reduced, the adsorption force between adjacent conductive electrode layers is also gradually reduced, and the columnar elastic body slowly rebounds according to the self rebounding force; when the driving signal is at time T3, the pillar elastomer bounces back to its original state, as shown in fig. 7 c.

During the T3-T4 state: at the time T3 to T4, the driving input signal is substantially 0, and there is substantially no electric field force acting between adjacent conductive electrode layers, so there is no electrostatic adsorption force, and the columnar elastic body remains in the original state.

The driving signal includes a periodic variation as shown between the time points T1-T4, the frequency of the driving signal shown in fig. 6 is preferably 50Hz, and in one embodiment, the frequency of the input signal may be 20Hz-200Hz, and the driving signal with different frequencies may be input according to different user requirements. For example, if the user wants to experience a stronger vibratory sensation, the signal frequency may be increased. The input signal changes periodically, the columnar elastic body changes periodically from 0 deformation amount to the maximum deformation amount all the time, and the feeling fed back to the hand of the user is tactile feedback.

FIG. 8 is a schematic structural diagram of a membrane keypad according to an embodiment of the present invention, wherein a single key 20 can employ the haptic feedback module shown in FIG. 5. Because the finger is the arc, when the finger is pressed on the product, the tactility that produces of different positions of finger is different, makes the diameter of the columnar elastomer of different regional distribution in the elastic layer different, for example can be that the diameter of the columnar elastomer in the middle part of the elastic layer is less than the diameter of peripheral columnar elastomer, just so can accomplish in different regions, the tactile feedback that the columnar elastomer feedbacks to the finger is whole relatively more even for user experience is better. As shown in fig. 8, each letter or each key is respectively pulled out of the corresponding electrode leading-out terminal, and different driving signals are respectively input, so that each key can input different driving voltages according to the experience requirements of the user in the using process, and different tactile feedbacks can be obtained.

In the haptic feedback module in the above embodiments, the conductive electrode layer may be fabricated on a transparent or opaque substrate, such as a thin film material of Polyethylene terephthalate (PET), Polycarbonate (PC), glass, or the like, by sputtering, evaporation, printing, or the like. The electrode pattern of the conductive electrode layer can be obtained by etching an Indium Tin Oxide (ITO) conductive film, screen-printing conductive paste on PET, or by using a Metal wire mesh process.

According to the touch feedback module, by utilizing the advantages that the elastic body can easily generate elastic deformation and generate vibration under stress, the diameters of the columnar elastic bodies distributed in different areas in the elastic layer are set to be different in the touch feedback module, so that fingers can obtain uniform reaction force at different contact positions, and the touch feedback uniformity feeling of a user is improved; the structural design of the laminated conductive film effectively reduces the thickness of the product.

Adopt the membrane keyboard of tactile feedback module in this application embodiment, overturned the structural design of traditional button keyboard, have thickness thin, can buckle, do not have button clearance, the appearance is pleasing to the eye, a great deal of advantages such as tactile feedback is effectual.

In an embodiment of the present application, the provided electronic device can be a smart watch, a mobile phone camera, a tablet computer camera, an intelligent wearable device, and the like, and the electronic device adopting the haptic feedback module in the embodiment of the present application has a better haptic feedback effect.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

1. A haptic feedback module includes at least two stacked conductive films,

the conducting film comprises a film insulating layer, an elastic layer and a conducting electrode layer, wherein the film insulating layer, the elastic layer and the conducting electrode layer are sequentially stacked, and the conducting film is characterized in that:

the elastic layer comprises columnar elastic bodies which are mutually independent, and the diameters of the columnar elastic bodies distributed in different areas in the elastic layer are different;

wherein the thin film insulating layer of one of the adjacent conductive films is adjacent to the elastic layer of the other conductive film.

2. A haptic feedback module as recited in claim 1 wherein said diameter of said columnar elastomer in a central portion of said elastic layer is different from said diameter of said columnar elastomer in a peripheral portion of said elastic layer.

3. A haptic feedback module as recited in claim 2 wherein said diameter of said columnar elastic body in a central portion of said elastic layer is smaller than said diameter of said columnar elastic body in a peripheral portion of said elastic layer.

4. A haptic feedback module as recited in claim 1 wherein said elastic layer has a thickness of 30um-50 um.

5. A haptic feedback module as recited in claim 1 wherein said conductive electrode layer has a thickness of 10um-50 μm.

6. A haptic feedback module as recited in any of claims 1-5 wherein said conductive film has from 2 layers to 40 layers.

7. A haptic feedback module according to any of claims 1-5, wherein adjacent conductive electrode layers respectively pull out electrode terminals for inputting voltage signals of different polarities.

8. A haptic feedback module as recited in claim 7 wherein said voltage signal is a triangular wave voltage signal.

9. A haptic feedback module according to any one of claims 1-5, wherein:

the conductive electrode layer is respectively connected with the elastic layer and the thin film insulating layer in an overlapping mode;

the adjacent conductive films are connected in an overlapping manner.

10. A haptic feedback module according to any one of claims 1-5, wherein:

the thin film insulating layer is made of flexible materials.

11. A membrane keypad, comprising:

the haptic feedback module of any of claims 1-10, wherein the haptic feedback module is configured for a key, and when the key senses a touch, the columnar elastic body generates a vibration feedback under an electric field force.

12. An electronic device, comprising:

the haptic feedback module of any of claims 1-10.

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