CN113391724A - Pressure module, touch panel and electronic device - Google Patents
Pressure module, touch panel and electronic device Download PDFInfo
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- CN113391724A CN113391724A CN202110623027.6A CN202110623027A CN113391724A CN 113391724 A CN113391724 A CN 113391724A CN 202110623027 A CN202110623027 A CN 202110623027A CN 113391724 A CN113391724 A CN 113391724A
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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
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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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
- G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves
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- 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
- G06F2203/04105—Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
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Abstract
The utility model provides a pressure module, includes first recognition cell, first recognition cell includes first cavity, first elastic layer, first inner electrode layer, first piezoelectric film layer and first outer electrode layer, first elastic layer first inner electrode layer first piezoelectric film layer reaches first outer electrode layer sets gradually by interior and forms hollow tubular structure outward, first recognition cell makes for hollow tubular structure first piezoelectric film layer can take place to warp in thickness and girth direction, for first piezoelectric film layer provides bigger deformation space and deflection, and the deflection increase helps enlargiing the signal of telecommunication, can improve pressure detection's sensitivity and degree of accuracy, can detect and leave the fingerprint or the pressure of the more distant department of pressure module. The invention also provides a touch panel and an electronic device.
Description
Technical Field
The invention relates to the technical field of touch identification, in particular to a pressure module, a touch panel and an electronic device.
Background
Piezoelectric materials are increasingly widely applied in the fields of fingerprint identification and touch control, and more products (such as mobile phones, computers, switches, electronic billboards, automobile cabs, refrigerators and the like) use the piezoelectric materials for pressure detection.
The existing product carries out pressure detection through a pressure module arranged in the existing product, but most of the existing common fingerprint modules adopt a single-layer structure and occupy a small area of a panel, so that pressing signals at different positions of the panel cannot be sensitively detected, and the detection accuracy and sensitivity are low; on the other hand, when a user presses the panel, the piezoelectric material has a small deformation amount and the deformation is concentrated in one direction, so that an electric signal is weak, and the detection accuracy and sensitivity are affected.
Disclosure of Invention
In view of the above, the present invention provides a pressure module, a touch panel and an electronic device with high accuracy and sensitivity.
The pressure module comprises a first identification unit, wherein the first identification unit comprises a first cavity, a first elastic layer, a first inner electrode layer, a first piezoelectric thin film layer and a first outer electrode layer, and the first elastic layer, the first inner electrode layer, the first piezoelectric thin film layer and the first outer electrode layer are sequentially arranged from inside to outside to form a hollow tubular structure.
The first identification unit in the pressure module is of a hollow tubular structure, so that the first piezoelectric film layer can deform in the thickness and circumference directions, a larger deformation space and a larger deformation amount are provided for the first piezoelectric film layer, the increase of the deformation amount is beneficial to amplifying an electric signal, the sensitivity and the accuracy of pressure detection can be improved, and the pressure far away from the pressure module can be detected.
Further, the first identification unit further comprises a thin film transistor positioned on the first inner electrode layer; when the thin film transistor is in a first state, the thin film transistor is disconnected with the electrode of the first inner electrode layer so as to perform fingerprint identification; and in a second state, the thin film transistor is electrically connected with the electrode of the first inner electrode layer so as to detect the pressure.
The pressure module is provided with the thin film transistor on the first electrode layer and controls the thin film transistor to be electrically connected with or disconnected from the first inner electrode layer, so that two functions of fingerprint identification and pressure detection are realized.
Further, the first cavity is formed in the middle of the hollow tubular structure of the first identification unit in a closed and surrounding mode through the first elastic layer.
The first cavity is enclosed and surrounded in the middle of the hollow tubular structure by the first elastic layer, and other elements are not directly arranged on the first elastic layer and the first cavity for supporting, so that on one hand, a larger deformation space can be provided, and the resistance to deformation is reduced; on the other hand, the stress on the periphery is uniform, the first piezoelectric thin film layer is beneficial to deformation in two different directions of thickness and perimeter, and the detection accuracy and sensitivity are further improved.
Further, the cross section of the first identification unit is in a long strip shape or a round shape. When the fingerprint identification device is used for fingerprint identification, the area opposite to the hand of a user can be increased by adopting the strip-shaped cross section, so that the speed and the precision of fingerprint identification are improved; when the pressure sensor is used for pressure detection, the round cross section is convenient for multiple installation and batch manufacturing, and the production efficiency is improved.
Further, the pressure module is still including being fixed in the second recognition unit of first recognition unit, the second recognition unit includes a plurality of piezoelectric sensor, a plurality of piezoelectric sensor arrange in proper order and be fixed in first outer electrode layer is kept away from one side of first cavity, every piezoelectric sensor includes second cavity, second elastic layer, second inner electrode layer, second piezoelectric film layer and second outer electrode layer, the second elastic layer, the second inner electrode layer, second piezoelectric film layer and the second outer electrode layer sets gradually from inside to outside and forms hollow tubular structure.
Through fixing a plurality of piezoelectric sensors that have the second cavity at first recognition element, the deformation that every hollow tubular structure's piezoelectric sensor takes place and the signal of electricity feedback also can superpose, helps improving the sensitivity and the precision of detection.
Further, the second cavity is enclosed and surrounded by the second elastic layer in the middle of the hollow tubular structure formed in the piezoelectric sensor.
The second cavity is formed in the middle of the hollow tubular structure of the piezoelectric sensor in a closed and surrounding mode through the second elastic layer, and other elements are not arranged between the second cavity and the second elastic layer for supporting, so that on one hand, a larger deformation space can be provided for the second piezoelectric film layer, and the deformation resistance is reduced; on the other hand can guarantee that the atress is even all around, is favorable to the second piezoelectric thin film layer warp in two different directions of thickness and girth, helps enlargiing the signal of telecommunication, improves the precision and the sensitivity that the pressure module detected.
Further, the second identification unit is a multilayer structure formed by sequentially arranging the plurality of piezoelectric sensors.
Through with the multilayer structure that second recognition cell set to become by a plurality of piezoelectric sensor rows, the deformation that each layer piezoelectric sensor takes place all can superpose, further improves the sensitivity and the precision of detection.
Further, the cross section of the piezoelectric sensor is circular, and/or the cross section of the second cavity is circular.
The cross section of each piezoelectric sensor is round, when a plurality of piezoelectric sensors are assembled, a gap is formed between every two piezoelectric sensors, a deformation space can be provided for the piezoelectric sensors, the piezoelectric sensors can be directly installed without alignment during assembly, the installation difficulty is easily reduced, and the production efficiency is improved; the cross section of the second cavity is set to be circular, so that the mass production is easy; when the cross section of piezoelectric sensor is circular, just when the cross section of second cavity is circular, when pressing piezoelectric sensor atress is even easily produces deformation, improves the sensitivity and the precision of detection.
Further, the plurality of piezoelectric sensors are located on opposite sides of the first cavity from the first piezoelectric film.
Generally, in order to ensure the accuracy of fingerprint identification, the thin film transistor needs to be close to the panel, and the piezoelectric sensors and the thin film transistor are arranged on two sides of the first cavity, so that the thin film transistor is installed close to the panel as much as possible during installation.
A touch panel comprises a panel and a pressure module, wherein one side, far away from a second identification unit, of a first identification unit is fixed on the panel.
Further, a distance between the thin film transistor and the panel is smaller than a distance between the second recognition unit and the panel.
Because the first identification unit needs to perform fingerprint identification, the first identification unit is fixed on the panel and is as close to the panel as possible, so that the transmission of ultrasonic waves is facilitated, and the speed of fingerprint identification is increased.
The utility model provides an electronic device, includes the casing and touch panel, touch panel is fixed in the casing, the pressure module is located in the casing, the panel is the light-passing board, sets up on electronic device the pressure module can realize full-screen fingerprint identification and pressure detection, and the user presses at any position of panel and can all be detected.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a perspective view of an electronic device according to a preferred embodiment of the invention.
Fig. 2 is a schematic partial cross-sectional view of the electronic device of fig. 1 along line II-II.
FIG. 3 is a schematic cross-sectional view of the touch panel of FIG. 1 according to a first embodiment
Fig. 4 is a schematic cross-sectional view of a second embodiment of the touch panel shown in fig. 1.
Fig. 5 is a schematic cross-sectional view of a third embodiment of the touch panel shown in fig. 1.
Reference numerals:
a housing 100; a touch panel 200; a panel 300; an outer surface 301; an inner surface 302;
a pressure module 400;
a first recognition unit 50;
a first cavity 51; a first elastic layer 52; the first inner electrode layer 53; a first piezoelectric thin film layer 54; a first outer electrode layer 55; a thin film transistor 56;
a second recognition unit 60;
a piezoelectric sensor 61; a second cavity 611; a second elastic layer 612; a second inner electrode layer 613; a second piezoelectric thin film layer 614; and a second external electrode layer 615.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, 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; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Each feature of the embodiments of the present invention may be combined or integrated with each other partially or wholly. Those skilled in the art will appreciate that the features of the various embodiments may also be technically interoperated and driven. The features of the various embodiments may be implemented independently of each other or in combination with each other.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1 and fig. 2, the present invention provides an electronic device, which includes a housing 100 and a touch panel 200 fixed to the housing 100. The touch panel 200 includes a panel 300 and a pressure module 400 fixed to the panel 300, the pressure module 400 is located in the housing 100, and the pressure module 400 is used for detecting a fingerprint of a user and a pressure applied thereto. In this embodiment, the pressure module 400 performs fingerprint detection by ultrasonic waves.
The panel 300 includes an outer surface 301 and an inner surface 302 opposite to the outer surface 301, a user can perform operations such as touching, pressing or sliding on the outer surface 301, and the pressure module 400 is fixed on the inner surface 302 of the panel 300. The pressure module 400 is fixed on the inner surface 302, so that the distance between the pressure module 400 and a user can be reduced as much as possible, transmission of ultrasonic waves is facilitated, and the speed of fingerprint identification is increased.
The panel 300 may be transparent or opaque.
The electronic devices include, but are not limited to: mobile phones, mobile television receivers, wireless devices, smart phones, smart cards, wearable devices (such as bracelets, armbands, patches, or the like), bluetooth devices, laptops, tablets, printers, copies, e-readers, cockpit controls and/or displays, electronic billboards, projectors, refrigerators, washing machines, automated teller machines, switches, and the like.
The touch panel 200 may be a transparent display screen or a non-transparent cover plate, such as a switch panel.
Referring to fig. 3, fig. 3 shows a first embodiment of the touch panel 200 according to the present invention, in which the pressure module 400 includes a first identification unit 50, and the first identification unit 50 is fixedly attached to the inner surface 302 of the panel 300.
The first identification unit 50 includes a first cavity 51, a first elastic layer 52, a first inner electrode layer 53, a first piezoelectric film layer 54 and a first outer electrode layer 55, the first cavity 51 is formed by enclosing and surrounding the first elastic layer 52, and the first elastic layer 52, the first inner electrode layer 53, the first piezoelectric film layer 54 and the first outer electrode layer 55 are sequentially arranged from inside to outside to form a hollow tubular structure. Any one of the first elastic layer 52, the first inner electrode layer 53, the first piezoelectric film 54, and the first outer electrode layer 55 may be a closed ring structure, or only some of the layers may be closed ring structures.
In this embodiment, the first identification unit 50 is formed by combining a plurality of hollow tubes, and the first elastic layer 52, the first inner electrode layer 53, the first piezoelectric film layer 54, and the first outer electrode layer 55 are fixed by adhesion. The first inner electrode layer 53 and the first outer electrode layer 55 are connected to the outside through leads, respectively, for transmitting signals.
The material of the first elastic layer 52 may be made of a hydrophobic silicone material such as Polydimethylsiloxane (PDMS), and may also be an elastic metal sheet. The elastic layer made of PDMS material has good flexibility and deformation capability and good chemical inertia, and is not easy to generate deformation fatigue after multiple denaturation; in addition, the first inner electrode layer 53 located thereon can be protected from abrasion due to multiple deformations. The elastic metal sheet is used as the first elastic layer 52, which can support the first inner electrode layer 53, the first piezoelectric thin film layer 54 and the first outer electrode layer 55 well, and is low in cost and easy to manufacture.
The materials used for the electrodes on the first inner electrode layer 53 and the first outer electrode layer 55 include, but are not limited to, silver, copper, indium tin oxide, PEDOT, or the like.
The piezoelectric material on the first piezoelectric thin film layer 54 includes an organic fluoropolymer, and may be polyvinylidene fluoride (PVDF), a polylactic acid film (PLLA), a copolymer of vinylidene fluoride and trifluoroethylene (PVDF-Trfe), or a composite piezoelectric material.
The first recognition unit 50 in the pressure module 400 is of a hollow tubular structure, so that the first piezoelectric thin film layer 54 can deform in the thickness and circumference directions, a larger deformation space and deformation are provided for the first piezoelectric thin film layer 54, the increase of the deformation facilitates amplification of an electric signal, the sensitivity and accuracy of pressure detection can be improved, and even if the pressure at a position far away from the pressure module 400 can be detected, full-screen pressure detection is further realized. Since the first cavity 51 is formed in the middle of the hollow tubular structure of the first identification unit 50 by the first elastic layer 52 in a closed and surrounding manner, and no other elements are arranged between the first cavity 51 and the first elastic layer 52 for supporting, on one hand, a larger deformation space can be provided for the first piezoelectric film layer 54, and the resistance to deformation is reduced; on the other hand, the stress on the periphery can be ensured to be uniform, so that the first piezoelectric film layer 54 is beneficial to deformation in two different directions of thickness and perimeter, the electric signal amplification is facilitated, and the detection accuracy and sensitivity of the pressure module 400 are improved.
The cross section of the first recognition unit 50 is in a shape of a long strip or a circle. When the pressure module 400 is used for fingerprint identification, the relative area between the first identification unit 50 and a finger of a user can be increased due to the long strip-shaped cross section, so that the speed and the accuracy of fingerprint identification of the pressure module 400 can be improved; when the pressure detection device is used for pressure detection, the round cross section is convenient for multiple installation, batch manufacturing is convenient, and the production efficiency is improved.
Further, the first identification unit 50 further includes a thin film transistor 56 for modulating a voltage for driving the first piezoelectric thin film layer 54 and receiving an electrical signal converted by the vibration of the first piezoelectric thin film layer 54. The thin film transistor 56 is located on the first inner electrode layer 53, the thin film transistor 56 is connected to an IC unit (not shown), and the IC unit is used for controlling the thin film transistor 56 to be electrically connected to or disconnected from the electrode of the first inner electrode layer 53.
In the first state, the IC unit controls the thin film transistor 56 to be disconnected from the electrode of the first inner electrode layer 53, and the pressure module 400 is used to detect the fingerprint of the user. Specifically, when a finger of a user is placed at any position on the panel 300, the thin film transistor 56 drives the first piezoelectric thin film layer 54 to vibrate and emit ultrasonic waves, the ultrasonic waves pass through the panel 300 and are projected to the finger of the user, and a part of the ultrasonic waves return to drive the first piezoelectric thin film layer 54 to vibrate and generate electric signals which are received by the thin film transistor 56, so that the fingerprint of the user is collected. It can be understood that, because of the difference between the fingerprint ridges and the valleys of the finger, the ultrasonic waves reflected back by different fingerprints are different, and further, the collected electric signals are different, so that the fingerprint identification through the ultrasonic waves is realized.
In the second state, the IC unit controls the thin film transistor 56 to be electrically connected to the electrode of the first inner electrode layer 53, at this time, the thin film transistor 56 serves as an upper electrode of the first inner electrode layer 53, and when a user presses any position of the panel 300, the panel 300 deforms/displaces, and further drives the first piezoelectric thin film layer 54 located between the first inner electrode layer 53 and the first outer electrode layer 55 to deform, and the first piezoelectric thin film layer 54 deforms and is converted into an electrical signal to detect the pressure of the pressed portion.
In view of this, the pressure module 400 can realize two functions, namely, fingerprint recognition and pressure detection, by disposing the thin film transistor 56 in the first recognition unit 50. The first recognition unit 50 has a hollow tubular structure, so that the first piezoelectric thin film layer 54 can deform in the thickness and circumference directions, a larger deformation space and deformation are provided for the first piezoelectric thin film layer 54, the increase of the deformation facilitates amplification of an electric signal, the sensitivity and accuracy of fingerprint recognition and pressure detection can be improved, and even if the pressing at a position far away from the pressure module 400 can be detected, full-screen fingerprint recognition and pressure detection are realized.
The first cavity 51 is formed in the middle of the hollow tubular structure of the first identification unit 50 in a closed and surrounding manner by the first elastic layer 52, and other elements are not arranged between the first cavity 51 and the first elastic layer 52 for supporting, so that on one hand, a larger deformation space can be provided for the first piezoelectric film layer 54, and the resistance to deformation is reduced; on the other hand, the stress on the periphery can be ensured to be uniform, so that the first piezoelectric film layer 54 is beneficial to deformation in two different directions of thickness and perimeter, the electric signal amplification is facilitated, and the detection accuracy and sensitivity of the pressure module 400 are improved.
At present, in an electronic device with a display screen, such as a mobile phone and a tablet computer, a fingerprint module is usually arranged right below the screen, and can be unlocked only at a fixed position during unlocking. The first identification unit 50 of the pressure module 400 in the present invention is of a hollow tubular structure, and the first cavity 51 is formed by the first elastic layer 52 in a closed and surrounding manner, so that when a user touches or presses, the first cavity 51 and the first elastic layer 52 can deform the first piezoelectric film layer 53 in the thickness and circumference directions, the deformation space and deformation amount are increased, and further, the electrical signal is amplified, and the sensitivity, accuracy and range of fingerprint identification and pressure detection are improved. Therefore, the pressure module 400 of the present invention can be disposed at any position of the display screen, such as above, below, corner, side, or middle, and can realize full-screen fingerprint identification and pressure detection, that is, can realize unlocking or operation at any position of the touch panel 200.
Referring to fig. 4, fig. 4 shows a second embodiment of the touch panel 200 of the present invention, which is different from the first embodiment in that the pressure module 400 of the touch panel 200 further includes a second identification unit 60 for pressure detection, the second identification unit 60 is fixed to the first identification unit 50, and a distance between the thin film transistor 56 and the panel 300 is smaller than a distance between the second identification unit 60 and the panel 300. Since the first identification unit 50 needs to perform fingerprint identification, the first identification unit 50 is fixed to the panel 300, and the thin film transistor 56 is located as close to the panel 300 as possible, which facilitates transmission of ultrasonic waves and increases the speed of fingerprint identification.
The first recognition unit 50 can realize two functions of fingerprint recognition and pressure detection, but needs to be performed in different time intervals, and after the second recognition unit 60 is fixed on the first recognition unit 50, the pressure module 400 performs fingerprint recognition and pressure detection simultaneously.
The second recognition unit 60 includes a plurality of piezoelectric sensors 61, and the plurality of piezoelectric sensors 61 are sequentially fixed on a side of the first recognition unit 50 away from the panel 300. Specifically, the plurality of piezoelectric sensors 61 are fixed on a side of the first outer electrode layer 55 away from the first cavity 51, the plurality of piezoelectric sensors 61 and the thin film transistor 56 are located on opposite sides of the first cavity 51, and each of the piezoelectric sensors 61 is led out through a lead wire to transmit a signal. In the present embodiment, the plurality of piezoelectric sensors 61 are sequentially arranged in a single-layer structure
The piezoelectric sensor 61 includes a second cavity 611, a second elastic layer 612, a second inner electrode layer 613, a second piezoelectric film layer 64, and a second outer electrode layer 65, the second inner electrode layer 613, the second piezoelectric film layer 64, and the second outer electrode layer 65 are sequentially disposed from inside to outside to form a hollow tubular structure, and the second cavity 611, the second inner electrode layer 613, the second piezoelectric film layer 64, and the second outer electrode layer 65 are fixed by means of adhesion. Any one of the second elastic layer 612, the second inner electrode layer 613, the second piezoelectric thin film layer 64, and the second outer electrode layer 65 may be an annular closed structure, or only some of the layers may be closed annular structures, and in this embodiment, the piezoelectric sensor 61 is formed by compounding a plurality of hollow tubes. By fixing the piezoelectric sensors 61 with the second cavities 611 on the first recognition unit 50, the deformation and the electrical feedback signal generated by the piezoelectric sensor 61 of each hollow tubular structure can be superimposed, and it can be ensured that the pressure can be recovered after being removed, and in addition, the deformation and the electrical feedback signal generated by the first recognition unit 50 can be superimposed, which is helpful for improving the sensitivity, the accuracy and the detection range of the detection.
The second cavity 611 is enclosed and surrounded by the second elastic layer 612 in the middle of the hollow tubular structure formed in the piezoelectric sensor 61, and no other elements are arranged between the second cavity 51 and the second elastic layer 52 for supporting, so that on one hand, a larger deformation space can be provided for the second piezoelectric thin film layer 614, and the resistance to deformation is reduced; on the other hand, the pressure module 400 can ensure that the stress is uniform all around, so that the second piezoelectric thin film layer 614 is deformed in two different directions of thickness and perimeter, the electric signal is amplified, and the detection accuracy and sensitivity of the pressure module 400 are improved
The material of the second elastic layer 612 may be made of a hydrophobic silicone material such as Polydimethylsiloxane (PDMS), or may be an elastic metal sheet. The elastic layer made of PDMS material has good flexibility and deformation capability and good chemical inertia, and is not easy to generate deformation fatigue after multiple denaturation; in addition, the second internal electrode layer 613 located thereon can be protected from abrasion due to multiple deformations. The second elastic layer 612 made of an elastic metal sheet can support the second inner electrode layer 613, the second piezoelectric thin film layer 614, and the second outer electrode layer 615 well, and the elastic metal sheet is low in cost and easy to manufacture.
The materials used for the electrodes on the first inner electrode layer 53 and the first outer electrode layer 55 include, but are not limited to, silver, copper, indium tin oxide, PEDOT, or the like.
The piezoelectric material on the first piezoelectric thin film layer 54 includes an organic fluoropolymer, and may be polyvinylidene fluoride (PVDF), a polylactic acid film (PLLA), a copolymer of vinylidene fluoride and trifluoroethylene (PVDF-Trfe), or a composite piezoelectric material.
The cross-section of the piezoelectric sensor 61 is circular and/or the cross-section of the second cavity 611 is circular. The cross section of the piezoelectric sensor 61 is set to be circular, when a plurality of piezoelectric sensors 61 are assembled, a gap is formed between every two piezoelectric sensors, a deformation space can be provided for the piezoelectric sensors 61, and the piezoelectric sensors can be directly installed without alignment during assembly, so that the installation difficulty is easily reduced and the production efficiency is improved; the cross section of the second cavity 611 is set to be circular, so that the mass production is easy; when the cross section of the piezoelectric sensor 61 is circular, and the cross section of the second cavity 611 is circular, the piezoelectric sensor 61 is uniformly stressed and easily deformed during pressing, and the detection sensitivity and precision are improved.
Referring to fig. 5, fig. 5 shows a third embodiment of the touch panel 200 according to the present invention, which is different from the second embodiment in that: the second identification unit 60 includes a plurality of multilayer structures formed by arranging the piezoelectric sensors 61, and compared with the single-layer structure in the second embodiment, the multilayer structure can overlap the deformation of each layer of the piezoelectric sensors 61, which is beneficial to improving the detection accuracy and sensitivity, and can detect the pressed part even far away from the pressure module 400, so that the detection range is expanded, full-screen fingerprint identification and pressure detection are facilitated, and the advantage is particularly great in games.
When using the electronic device of the present invention, a user may set instructions according to his or her needs, for example, the touch panel 200 of the electronic device is divided into a plurality of areas, and different pressing actions (such as light touch, standard touch, and heavy touch) are set in each area to form different instructions, for example: the first region is unlocked by touching again, and the second region is locked by touching lightly, so that misoperation caused by mistaken touch in the use process can be avoided.
The pressure module 400 provided by the invention comprises a first identification unit 50, wherein the first identification unit 50 comprises a first cavity 51, a first elastic layer 52, a first inner electrode layer 53, a first piezoelectric film layer 54, a first outer electrode layer 55 and a thin film transistor 56 positioned on the first inner electrode layer 53, the first elastic layer 52, the first inner electrode layer 53, the first piezoelectric film layer 54 and the first outer electrode layer 55 are sequentially arranged from inside to outside to form a hollow tubular structure, fingerprint identification and pressure detection can be realized by controlling the thin film transistor 56 to be electrically connected with or disconnected from the first inner electrode layer 53, in addition, the first identification unit 50 is of the hollow tubular structure, so that the first piezoelectric film layer 54 can be deformed in multiple directions, electric signals can be amplified, and the sensitivity of fingerprint identification and pressure detection can be improved, Accuracy and scope, and then realize full-screen fingerprint identification and pressure detection.
In the description herein, references to the description of the terms "some embodiments," "optionally," "further," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (12)
1. A pressure module, its characterized in that: the identification device comprises a first identification unit, wherein the first identification unit comprises a first cavity, a first elastic layer, a first inner electrode layer, a first piezoelectric thin film layer and a first outer electrode layer, and the first elastic layer, the first inner electrode layer, the first piezoelectric thin film layer and the first outer electrode layer are sequentially arranged from inside to outside to form a hollow tubular structure.
2. The pressure module of claim 1, wherein: the first identification unit further comprises a thin film transistor positioned on the first inner electrode layer; when the thin film transistor is in a first state, the thin film transistor is disconnected with the electrode of the first inner electrode layer so as to perform fingerprint identification; and in a second state, the thin film transistor is electrically connected with the electrode of the first inner electrode layer so as to detect the pressure.
3. The pressure module of claim 1, wherein: the first cavity is formed in the middle of the hollow tubular structure of the first identification unit in a closed and surrounding mode through the first elastic layer.
4. The pressure module of claim 1, wherein: the cross section of the first identification unit is in a strip shape or a round shape.
5. A pressure module according to any one of claims 1-4, characterized in that: still including being fixed in the second recognition cell of first recognition cell, the second recognition cell is used for detecting the pressure that the user applyed, including a plurality of piezoelectric sensor, a plurality of piezoelectric sensor arrange in proper order and be fixed in first outer electrode layer is kept away from one side of first cavity, every piezoelectric sensor includes second cavity, second elastic layer, second inner electrode layer, second piezoelectric thin layer and second outer electrode layer, the second elastic layer the second inner electrode layer the second piezoelectric thin layer reaches the second outer electrode layer sets gradually from inside to outside forms hollow tubular structure.
6. The pressure module of claim 5, wherein: the second cavity is formed in the middle of the hollow tubular structure of the piezoelectric sensor in a closed and surrounding mode through the second elastic layer.
7. The pressure module of claim 5, wherein: the second identification unit is a multilayer structure formed by sequentially arranging the piezoelectric sensors.
8. The pressure module of claim 5, wherein: the cross section of the piezoelectric sensor is circular, and/or the cross section of the second cavity is circular.
9. The pressure module of claim 5, wherein: the plurality of piezoelectric sensors are located on opposite sides of the first cavity from the first piezoelectric film.
10. A touch panel, comprising: comprising a panel and a pressure module according to any of claims 1-9, the side of the first identification unit remote from the second identification unit being fixed to the panel.
11. The touch panel of claim 10, wherein: the distance between the thin film transistor and the panel is smaller than the distance between the second identification unit and the panel.
12. An electronic device, characterized in that: the touch panel of claim 10 or 11, wherein the touch panel is fixed to the housing, the pressure module is located in the housing, and the panel is a transparent plate.
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| CN202110623027.6A CN113391724A (en) | 2021-06-04 | 2021-06-04 | Pressure module, touch panel and electronic device |
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| CN202110623027.6A CN113391724A (en) | 2021-06-04 | 2021-06-04 | Pressure module, touch panel and electronic device |
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Application publication date: 20210914 |