TW201807946A - Flexible electronic device - Google Patents

Abstract

A flexible electronic device that can be folded and unfolded in three different dimensions is disclosed. The present disclosure provides a flexible electronic device comprising: a flexible substrate comprising a predetermined bending area, the predetermined bending area having a first surface and a second surface opposite the first surface; and at least one piezoelectric element arranged on the first surface of the predetermined bending area and capable of receiving a first electric signal, wherein the at least one piezoelectric element can contract or expand in response to the received electric signal so as to deform the flexible substrate in a first deformation direction.

Description

Flexible electronic device

The present invention generally relates to electronic devices; in particular, the present invention relates to flexible electronic devices.

Currently, the developed flexible electronic device can only bend with limited curvature, and cannot flex flexibly like the art of origami. The prior art can only bend at a curvature of at most 2 mm and can only achieve a single dimension of folding. However, the electronic device cannot be folded in a plurality of folds, and can only be mechanically bent, so that it has the disadvantage of being easily stored, carried, and transported, thereby limiting the possibility of application of the electronic device. Therefore, there is a need for a flexible electronic device that can be automatically stored, portable, transported, and easily and automatically resumed.

In order to solve the problems in the prior art, the inventors of the present invention have proposed appropriate inventive concepts and are embodied by the following various embodiments. One embodiment of the present invention is a flexible electronic device including a flexible substrate and at least a first piezoelectric element. The flexible substrate includes a predetermined bending region having a first surface and a second surface opposite the first surface. The at least one first piezoelectric element is located on the first surface of the predetermined bending region and can receive a first electrical signal, wherein the at least one first piezoelectric element can contract in response to the received electrical signal Or stretching to deform the flexible substrate in a first deformation direction. By means of the piezoelectric element, the user can deform the flexible electronic device without directly contacting it. For example, the user can control the piezoelectric element by radio signals to perform long-distance bending, folding or opening operations on the flexible electronic device. In one embodiment, the flexible electronic device further includes at least one second piezoelectric element located on the second surface of the predetermined bending zone and capable of receiving a second electrical signal, wherein the at least one second pressure The electrical component can contract or stretch in response to the received second electrical signal to deform the flexible substrate in a second direction. Since the piezoelectric elements in different positions can deform the flexible substrate in different directions, the flexible electronic device can be bent, folded or opened in different directions, thereby increasing the flexibility of the type change. Achieve the effect of origami. In one embodiment, the first deformation direction is opposite to the second deformation direction. For example, if the first piezoelectric element can fold the flexible substrate, the second piezoelectric element can open the flexible substrate. In one embodiment, the second state deformation is restored to one of the original states of the flexible substrate. Therefore, the flexible electronic device according to the present embodiment can be restored to its original state after being folded. In one embodiment, the flexible electronic device further includes a sensor on the flexible substrate. The sensor can be used to sense different types of signals and increase the functionality of the flexible electronic device. The sensitivity of the sensor can be correlated to the surface area of the flexible substrate. In one embodiment, the sensitivity of the sensor is greatest when the flexible substrate is fully expanded and shrinks as it folds. In one embodiment, the flexible substrate can be altered in shape and/or surface area and/or volume by deformation, folding, and/or flare depending on the sensitivity of the sensor. In one embodiment, the sensor is a physiological signal sensor. Physiological signals that can be sensed include blood glucose, heartbeat, nerve conduction signals, concentrations of specific types of cells in the blood, and the like. Depending on the requirements, the sensor is configured to sense different physiological signals. In one embodiment, the physiological signal sensor can sense the presence or absence of a particular gene, cell or virus, and the like. In one embodiment, the flexible electronic device further includes a transducer. The sensor is capable of converting non-electrical energy (eg, mechanical energy, such as heat, body temperature, rocking, pulse, etc. naturally generated by living body activity) into other forms of energy, such as electrical energy. In one embodiment, the sensor can cause the flexible electronic device to self-charge without an additional battery or if the battery is exhausted. In one embodiment, the flexible electronic device further includes a third piezoelectric element. The third piezoelectric element can be used to provide different deformation directions and increase the flexibility of the flexible substrate change pattern. The third piezoelectric element can also be used to receive physiological signals to cause the flexible electronic device to self-charge. In one embodiment, the third piezoelectric element can convert the mechanical energy generated by the heartbeat and/or blood flow of the living body, the nerve conduction signal, into electrical energy, and store the electrical energy or provide other electrical power. Working block. In one embodiment, the predetermined bending zone of the flexible electronic device has a first predetermined fold line region and a second predetermined fold line region, the first predetermined fold line region and the second predetermined fold line region intersecting. The angle of intersection can be ninety degrees or other suitable angles. The plurality of predetermined fold line regions can increase the flexibility of the flexible substrate type change, and can also increase the extent to which the flexible electronic device can be changed in volume. In one embodiment, the predetermined bend zone, the first predetermined fold line zone, and/or the second predetermined fold line zone comprise specific physical features or profile features, such as grooves. The physical features or profile features can adjust the overall and/or local stress conditions of the flexible substrate to increase the flexibility of the flexible substrate type change. In one embodiment, the piezoelectric element is disposed adjacent the recess. Since the groove thins the flexible substrate, the piezoelectric element can more easily deform the flexible substrate. In one embodiment, the flexible electronic device further includes a wireless communication module coupled to the at least one first piezoelectric element to provide the electrical signal. For example, a user of a flexible electronic device can remotely control the deformation of the flexible substrate through wireless communication signals. In one embodiment, the flexible electronic device can be implanted into the living body; in this case, the user can control the type change of the flexible electronic device that has been implanted in the living body through the wireless communication signal, Need to be in direct contact.

Figure 1 (a) shows a flexible substrate 1 in accordance with an embodiment of the present invention. The flexible substrate 1 includes a predetermined bending region 10, an upper surface 1a, and a lower surface 1b. The upper surface 1a is provided with at least one first piezoelectric element 11 and a functional module 13. The lower surface 1b may be provided with at least one second piezoelectric element 12 (not shown in Fig. 1(a)). The flexible substrate 1 can be made of different materials depending on different conditions. Useful materials include silicone, polyimide (PI), polyethylene terephthalate (PET), polypropylene (PP), polyethylene naphthalate (PEN), Polycarbonate (PC), polyester (PES), cyclic olefin copolymer (COC), composite of the foregoing materials, materials having flexibility and no influence on living organisms, flexible and implantable organisms Materials that are not rejected by organisms, and other suitable materials. The flexible substrate 1 can have different flexibility depending on different needs. In an embodiment, the flexibility of the flexible substrate 1 is sufficient to cause deformation in three directions of X, Y, and Z to be bent into a U shape. In an embodiment, the flexibility of the flexible substrate 1 is sufficient to be folded in either of the three directions of X, Y, and Z or all three directions. In an embodiment, the flexible substrate 1 can be opened and restored to its original shape after being folded in half. In an embodiment, the flexibility of the flexible substrate 1 is sufficient to fold it in multiple directions in any of the three directions of X, Y, and Z, for example, 2-5 times, 5-10 times, 11-15 times. , 16-20 times, or more. In one embodiment, the flexible substrate 1 is flexible enough to be folded and returned to its original shape after being folded in multiple times. The flexible substrate 1 may comprise one or more layers, and the different layers may have the same material or different materials. The degree of flexibility of each layer may be identical, partially different, or completely different. The flexible substrate 1 can include a circuit layer that can include active circuitry, passive circuitry, sensors, circuit connections, and other suitable circuit components. The thickness of the flexible substrate 1 can be between about 1 micrometer (μm) and about 100 micrometers. The flexible substrate 1 includes a predetermined bending region 10, and at least one first piezoelectric element 11 is disposed above the upper surface 1a and the predetermined bending region 10. The first piezoelectric element 11 can be contracted or stretched by the electrical signal provided by the functional module 13 or other functional modules not shown in FIG. 1(a) to generate mechanical force. As shown in FIG. 1(a), the predetermined bending region 10 has a plurality of first piezoelectric elements 11. When the number of first piezoelectric elements 11 simultaneously shrinks or stretches while receiving an electrical signal, the flexible substrate 1 can be deformed along the predetermined bending region 10 to bend the flexible substrate 1. That is, the first piezoelectric element 11 can cause the flexible substrate 1 to deform the flexible substrate 1 without being directly contacted by external force. In one embodiment, the functional module 13 includes a wireless communication module and can be contracted or stretched by providing the received wireless signal to the first piezoelectric element 11 to thereby deform the flexible substrate 1. The material of the first piezoelectric element 11 may include lead zirconate titanate (PZT), polyvinylidene fluoride (PVDF), zinc oxide (ZNO), and/or other suitable materials. The first piezoelectric elements 11 can have different numbers and sizes. The embodiment shown in Fig. 1(a) has a plurality of relatively small first piezoelectric elements 11; the embodiment shown in Fig. 1(b) has a strip-shaped first piezoelectric element 11 along a predetermined bending area. Configuration. The function module 13 can have different functions depending on the application environment in which the flexible substrate 1 is located. Although only four functional modules are shown in FIG. 1(a), they are only used for illustration, not for limiting the number of functional modules. The function module 13 can include a mechanism module, a wired communication module, a wireless communication module, a microcontroller module, a sensing module, a physiological signal monitoring module, a power supply module, a lighting module, a layout line, and a micro With wires, magnetic modules, optical modules, acoustic modules, or other suitable modules. 2(a) is a cross-sectional view of a flexible substrate in accordance with an embodiment of the present invention. The flexible substrate 1 may have not only the first piezoelectric element 11 on the upper surface 1a but also at least one second piezoelectric element 12 on the lower surface 1b. The second piezoelectric element 12 is disposed above the predetermined bending zone 10. In one embodiment, the position of the second piezoelectric element 12 corresponds to the position of the first piezoelectric element 11. Like the first piezoelectric element 11, the second piezoelectric element 12 can also contract or stretch by receiving an electrical signal and thereby generate a mechanical force. In one embodiment, the contraction or stretching of the second piezoelectric element 12 causes the flexible substrate 1 to deform. The first piezoelectric element 11 and the second piezoelectric element 12 can cause the flexible substrate 1 to be deformed in the same direction, and the flexible substrate 1 can be deformed in different directions. In one embodiment, the first piezoelectric element 11 and the second piezoelectric element 12 reverse the direction in which the flexible substrate 1 is deformed. As shown in FIG. 2(b), the mechanical force generated by the first piezoelectric element 11 or the second piezoelectric element 12 can bend the flexible substrate 1 in the positive Z direction. In one embodiment, the first piezoelectric element 11 and the second piezoelectric element 12 cause the flexible substrate 1 to bend in opposite directions; at this time, one of the flexible substrates 1 can be bent to provide an electrical signal. To the other, the flexible substrate 1 is bent in the opposite direction and the flexible substrate 1 is restored to its original shape. Figure 2(c) shows another possible bending direction. In order to make the first piezoelectric element 11 and/or the second piezoelectric element 12 bend the flexible substrate 1 more easily, it may be provided under the first piezoelectric element 11 and/or the second piezoelectric element 12 on the flexible substrate 1. Some physical features and / or type features to change its force characteristics. As shown in FIG. 2(d), the upper surface 1a and the lower surface 1b are each provided with a groove 101, and the first piezoelectric element 11 and the second piezoelectric element 12 are both disposed on the groove 101 or in the groove 101. In the embodiment shown in FIG. 2(d), the groove 101 thins the flexible substrate 1 at a predetermined bending region 10, so that the first piezoelectric element 11 and the second piezoelectric element 12 are identical. In the case of mechanical force, the flexible substrate 1 can be more easily deformed. The groove 101 may be larger or smaller than the first piezoelectric element 11 and/or the second piezoelectric element 12. In the embodiment shown in Fig. 2(d), the first piezoelectric element 11 is smaller than the groove 101 of the upper surface 1a and is placed therein, the first piezoelectric element 12 is larger than the groove 101 of the upper surface 1b and located Above the groove 101. In one embodiment, only the upper surface 1a or the lower surface 1b is provided with a recess 101. In one embodiment, the size of the groove 101 of the upper surface 1a is different from the size of the groove 101 of the lower surface 1b. In one embodiment, a groove 101 is provided under each of the first piezoelectric element 11 and the second piezoelectric element 12. In one embodiment, only a portion of the first piezoelectric element 11 and/or the second piezoelectric element 12 is provided with a recess 101 below it. Figure 3 shows a flexible substrate 3 in accordance with an embodiment of the present invention. The flexible substrate 3 is similar to the flexible substrate 1 shown in Fig. 1(a), and therefore only the differences between the two will be described below. Two sets of piezoelectric elements are disposed on the upper surface 3a of the flexible substrate 3, which are a first piezoelectric element 11a along the Y direction and a first piezoelectric element 11b along the X direction, respectively, which are respectively staggered with each other. The first predetermined fold line area 10a and the second predetermined fold line area 10b. The first piezoelectric element 11a and the first piezoelectric element 11b can deform, bend and/or respectively deform the flexible substrate 3 along the first predetermined polygonal line region 10a and the second predetermined polygonal line region 10b by the electrical signals received by the first piezoelectric element 11a and the first piezoelectric element 11b. fold. The first predetermined fold line region 10a and the second predetermined fold line region 10b in Fig. 3 are staggered at ninety degrees, but may be staggered at different angles and have different fold directions in different embodiments. In other embodiments, the upper surface 3a and/or the lower surface 3b of the flexible substrate may be provided with piezoelectric elements corresponding to a plurality of predetermined polygonal line regions, for example, two predetermined polygonal line regions, three predetermined polygonal line regions, and four One predetermined folding line area, five predetermined folding line areas, six predetermined folding line areas, seven predetermined folding line areas, eight predetermined folding line areas, or a greater number of predetermined folding line areas. 4 is a schematic diagram of a folding function of a flexible electronic device in accordance with an embodiment of the present invention. The flexible electronic device shown in FIG. 4 is square, but may have different shapes in different embodiments, such as rectangular, polygonal, and circular shapes having different aspect ratios. The flexible electronic device shown in FIG. 4 may include a flexible substrate as shown in FIG. 1(a), FIG. 1(b) or FIG. 3, or according to an embodiment within the scope of the spirit of the present invention. A flexible substrate manufactured. The first state 41 is an original state in which the flexible electronic device is not deformed, bent, or folded. Since the flexible electronic device shown in FIG. 4 has a flexible substrate in accordance with the spirit of the present invention, it can be folded along different predetermined bending/folding regions. In one embodiment, the flexible electronic device can be folded multiple times into a second state 42 according to the principle of origami. In one embodiment, the flexible electronic device in the second state 42 can be folded into the third state 43 again according to the principles of origami art. Compared to the flexible electronic device in the first state 41, the flexible electronic device in the third state 43 occupies a smaller volume and thus can have more applications. In one embodiment, the flexible electronic device is a physiological state (eg, blood glucose, heartbeat, neural signals, blood flow, etc.) sensors. If the area or volume of the physiological state sensor is too large, it may cause difficulty in implanting the living body. Since the flexible electronic device manufactured according to the embodiment of the present invention can be folded, the difficulty occurring in the process of implanting the living body can be reduced. In one embodiment, the flexible electronic device in the third state 43 can be deployed and returned to the first state 41 as needed. In one embodiment, a physiological condition sensor fabricated in accordance with an embodiment of the present invention may send an appropriate signal to open after folding and implanting the organism. In one embodiment, the deformation, folding, and opening of the flexible electronic device can be controlled by wireless communication signals. Although there are only three folded states in FIG. 4, the flexible electronic device according to an embodiment of the present invention can have a wider variety of folded states. 5 is a circuit block diagram 5 of a flexible electronic device in accordance with an embodiment of the present invention to illustrate the functions it may have. Circuit Blocks The blocks in Figure 5 can be used to implement the functions of the function module 13 shown in Figure 1 (a), and can also be used to implement other required functions. In one embodiment, the circuit block diagram 5 includes a microcontroller 501, a first piezoelectric element 502a, a second piezoelectric element 502b, a third piezoelectric element 502c, a sensor 503, a power supply module 504, and a communication. Module 505, and sensor 506. Since the circuit block diagram 5 is mainly for illustration, the number of modules shown in the drawings does not necessarily limit the number of modules in the embodiment. The function and/or number of modules may be increased or decreased by those skilled in the art without departing from the scope of the invention. In addition, although the modules in the circuit block diagram 5 are not connected by solid lines, in fact, the skilled person can use the conventional means to connect and/or couple the modules according to actual application requirements; The connected/coupled manner, form, pattern, etc., does not depart from the spirit of the invention. In addition, as described above, the flexible substrate in the flexible electronic device of the present invention may have one or more layers, so that the blocks of the circuit block FIG. 5 can be implemented in different layers of the flexible substrate without Without departing from the spirit of the invention, different parts of a single block may be separately implemented in different layers and interconnected in a conventional manner. The microcontroller 501 can have different sizes, materials, and power consumptions depending on different needs. The microcontroller 501 can include a digital computing module (such as a central processing unit (CPU)), volatile and/or non-volatile memory, an input/output (I/O) interface, a communication interface, a bus interface, and a clock. Generator, digital/analog converter, debug circuit, etc. The microcontroller 501 may be composed of discrete elements, or may be composed of integrated circuits, or may be composed of integrated circuits and discrete elements. In one embodiment, an appropriate software program may be present in the microcontroller 501 to automatically control the flexion or extension of the piezoelectric elements 502a-502c and control the flexible state at appropriate times, peripheral physical parameters, and the like. The deformation, folding, opening and the like of the electronic device. For example, the microcontroller 501 can be configured to open the flexible electronic device at a fixed time each day and to close the flexible electronic device at another fixed time. The first piezoelectric element 502a, the second piezoelectric element 502b, and the third piezoelectric element 502c can be used for conversion between electrical energy and mechanical energy. In one embodiment, the piezoelectric elements can be used to deform the flexible electronic device. In one embodiment, a piezoelectric element can be used to provide electrical power. The sensor 503 can be used to detect physical signals, such as mechanical, electromagnetic, thermodynamic, optical, acoustic, physiological (eg, blood glucose, heartbeat, concentration of specific types of cells in the blood) , nerve conduction, blood flow, etc.) and so on. In one embodiment, the sensor 503 operates without additional power. In one embodiment, sensor 503 requires additional power to operate. In one embodiment, the sensor 503 can be controlled via the microcontroller 501 and/or the communication module 505. In one embodiment, the flexible electronic device is a physiological signal sensor of the implantable organism, and the sensor 503 is a blood glucose sensor, and the microcontroller 501 is programmed to be used at a fixed time. The piezoelectric elements 502a-502c are controlled to open the flexible electronics to increase the sensitivity of the sensor 503 and to instruct the sensor 503 to measure blood glucose, and after the measurement is completed, by controlling the piezoelectric elements 502a-502c The flexible electronic device is folded up. The power supply module 504 is used to power modules/blocks that require power to operate to ensure proper operation. The power supply module 504 can be a battery, a bulk capacitor, a wireless charging receiver, and the like. The communication module 505 can be used to provide communication between the blocks in the circuit block diagram 5, and can also be used to provide communication between the flexible electronic device and the outside world. The communication module 505 can provide wired communication, wireless communication, or both. The communication module 505 is not necessarily based on electrical principles, but may be based on other physical principles such as mechanics, acoustics (eg, sonar), thermodynamics, quantum mechanics, and the like. In one embodiment, the communication module 505 can be used as an intermediary between the microcontroller 501, the piezoelectric elements 502a-502c, and other modules used to control the flexible electronic device. In one embodiment, the communication module 505 can receive wireless signals to control the contraction or extension of the piezoelectric elements 502a-502c and thereby control the deformation, folding, opening, etc. of the flexible electronic device. In one embodiment, the communication module 505 can receive the signals measured by the sensor 503 and transmit them to the outside world, such as an external computer or library. In one embodiment, the communication module 505 can be coupled to other devices of the user of the flexible electronic device, such as a cell phone, a computer, a watch, and the like. Transducer 506 is capable of converting non-electrical energy (eg, mechanical energy, such as heat, body temperature, sway, pulse, etc. naturally generated by living body activity) into other forms of energy, such as electrical energy. In one embodiment, sensor 506 can be used for communication or signal processing. In one embodiment, sensor 506 can supply power to other devices or blocks. Figure 6 (a) shows a flexible substrate 6 in accordance with an embodiment of the present invention. The flexible substrate 6 is similar to the flexible substrate 1 shown in Fig. 1(a), and therefore only the differences between the two will be described below. The flexible substrate 6 includes at least one first piezoelectric element 11 and an induction coil 601. The induction coil 601 can be controlled by other circuitry to generate a magnetic force when needed to increase the degree of bending. In the embodiment shown in FIG. 6(a), the flexible substrate 6 includes a first induction coil 601a and a second induction coil 601b, which are respectively placed on both sides of a predetermined bending zone. In other embodiments, the number and location of the inductive coils 601 can be adjusted for practical application needs. See Figure 6(b). During the deformation/bending of the flexible substrate 6 by the first piezoelectric element 11, current may be applied to the first induction coil 601a and the second induction coil 601b to generate a magnetic attraction force to increase the flexible substrate 6. Shape variable. In one embodiment, the first induction coil 601a and the second induction coil 601b may be subjected to different currents to generate a repulsive magnetic force to cause the flexible substrate 6 to be unfolded, thereby returning to the original state. The description and its summary are merely illustrative of one or more embodiments of the invention, This specification and its abstract portions are not intended to limit the scope of the patents filed by the applicant. The manner in which blocks are used above to describe the different functions of different embodiments of the present invention. The boundaries between the blocks are delineated for ease of description. As long as the specified functions and their relative relationships can be properly implemented, the boundaries defined above or in the drawings are not required to be rigidly adhered to. The description of the specific embodiments of the present invention can fully delineate the general nature of the present invention, so that the skilled person can make corresponding, appropriate, and not for any embodiment for a specific application without departing from the general spirit of the invention. Excessive modifications may be made without departing from the scope and equivalence of the invention. The scope of the patent application is defined by the scope of the appended claims and their equivalents, and not by the description, the abstract and the drawings.

1‧‧‧Flexible substrate

1a‧‧‧ upper surface

1b‧‧‧ lower surface

3‧‧‧Flexible substrate

5‧‧‧Circuit block diagram

6‧‧‧Flexible substrate

10‧‧‧ Scheduled bend zone

10a‧‧‧First scheduled fold area

10b‧‧‧Second scheduled fold area

11‧‧‧First Piezoelectric Element

11a‧‧‧First Piezoelectric Element

11b‧‧‧First Piezoelectric Element

12‧‧‧second piezoelectric element

13‧‧‧ functional modules

41‧‧‧First state

42‧‧‧Second state

43‧‧‧ third state

101‧‧‧ Groove

501‧‧‧Microcontroller

502a‧‧‧First Piezoelectric Element

502b‧‧‧second piezoelectric element

502c‧‧‧third piezoelectric element

503‧‧‧ sensor

504‧‧‧Power supply module

505‧‧‧Communication Module

506‧‧‧ sensor

601‧‧‧Induction coil

601a‧‧‧First induction coil

601b‧‧‧second induction coil

Figure 1 (a) is a perspective view of a flexible substrate in accordance with an embodiment of the present invention. Figure 1 (b) is a perspective view of a flexible substrate in accordance with an embodiment of the present invention. 2(a) is a cross-sectional view of a flexible substrate in accordance with an embodiment of the present invention. 2(b) is a cross-sectional view of a flexible substrate in accordance with an embodiment of the present invention. 2(c) is a cross-sectional view of a flexible substrate in accordance with an embodiment of the present invention. 2(d) is a cross-sectional view of a flexible substrate in accordance with an embodiment of the present invention. 3 is a perspective view of a flexible substrate in accordance with an embodiment of the present invention. 4 is a schematic diagram of a folding function of a flexible electronic device in accordance with an embodiment of the present invention. FIG. 5 is a circuit block diagram of a flexible electronic device in accordance with an embodiment of the present invention. Figure 6 (a) is a perspective view of a flexible substrate in accordance with an embodiment of the present invention. Figure 6 (b) is a perspective view of a flexible substrate in accordance with an embodiment of the present invention. Note that the various figures are for illustrative purposes only and are not intended to limit the size, number, proportion or connection.

Claims (13)

A flexible electronic device, comprising: a flexible substrate, the flexible substrate comprising a predetermined bending region, the predetermined bending region having a first surface and a second surface opposite to the first surface; At least one first piezoelectric element located on the first surface of the predetermined bending zone and capable of receiving a first electrical signal, wherein the at least one first piezoelectric component is responsive to the received electrical signal Shrinking or stretching causes the flexible substrate to deform in a first deformation direction. The flexible electronic device of claim 1, further comprising: at least one second piezoelectric element located on the second surface of the predetermined bending zone and capable of receiving a second electrical signal, wherein The at least one second piezoelectric element may contract or stretch in response to the received second electrical signal to deform the flexible substrate in a second direction, wherein the first deformation direction is opposite to the second deformation direction. The flexible electronic device of claim 1, wherein the second state deformation is restored to one of the original states of the flexible substrate. The flexible electronic device of claim 1, further comprising a sensor on the flexible substrate. The flexible electronic device of claim 3, wherein the sensor is a physiological signal sensor. The flexible electronic device of claim 1, further comprising a transducer for self-charging the flexible electronic device. The flexible electronic device of claim 1, further comprising a third piezoelectric element that receives the physiological signal to cause the flexible electronic device to self-charge. The flexible electronic device of claim 1, wherein the predetermined bending zone has a first predetermined folding line area and a second predetermined folding line area, the first predetermined folding line area and the second predetermined folding line area intersecting. The flexible electronic device of claim 8, wherein at least one of the first predetermined fold line region and the second predetermined fold line region comprises a recess. The flexible electronic device of claim 9, wherein the at least one first piezoelectric element is on the groove or in the groove. The flexible electronic device of claim 1, further comprising a wireless communication module coupled to the at least one first piezoelectric element to provide the electrical signal to the at least one first piezoelectric element. The flexible electronic device of claim 1, wherein the material of the flexible substrate comprises at least one of the following: silicone, polyimine (PI), polyethylene terephthalate (PET) Polypropylene (PP), polyethylene naphthalate (PEN), polycarbonate (PC), polyester (PES), cyclic olefin copolymer (COC) and composite materials thereof. The flexible electronic device of claim 1, further comprising a first inductive coil and a second inductive coil, the first inductive coil and the second inductive coil being respectively disposed on opposite sides of the predetermined bending region.