CN115500002A - Flexible stretchable circuit, preparation method thereof and electronic equipment - Google Patents

Abstract

The application relates to a flexible stretchable circuit, a preparation method thereof and electronic equipment, wherein the flexible stretchable circuit comprises a flexible stretchable substrate, a lead unit, a plurality of components and a packaging body; the lead unit comprises a middle lead, and a positive lead and a negative lead which are connected with the middle lead, the middle lead comprises a plurality of first leads and second leads which are arranged in a snake shape, the first leads and the second leads are crossed and connected to form a plurality of blank areas distributed in an array, and the plurality of first leads are interrupted to form a connection area; the components correspond to the connection areas one by one and are connected with the first lead; the packaging body is arranged on the flexible stretchable substrate, and the wire unit and each component are wrapped in the packaging body. When the circuit is stretched, the first wire and/or the second wire are stretched and deformed to have a longer wiring length, but the cross section area is not changed, so that the resistance value of the circuit resistor can be kept stable, and the normal work of the component can be realized when the small-size circuit is bent and stretched.

Description

Flexible and stretchable circuit and its preparation method, electronic device

technical field

The present application relates to the technical field of flexible electronics, in particular to a flexible and stretchable circuit, its preparation method, and electronic equipment.

Background technique

With the continuous advancement of science and technology, people pay more and more attention to health. In addition to traditional medical models such as treatment in hospitals, emerging health physiotherapy models such as family physiotherapy have gradually developed, and the requirements for home wearable physiotherapy products are also increasing. High and increasingly diverse. LED phototherapy products are an important category of home wearable physiotherapy products. As the medical principles and applicable diseases of phototherapy are continuously discovered, the products are gradually developing in the direction of intelligence, miniaturization, and flexibility.

In the manufacturing process of LED wearable phototherapy products, the flexible and stretchable circuit is the most important technical component, and it is also a technical problem that needs to be solved urgently to realize the miniaturization and flexibility of the product. At present, flexible wearable circuits mainly use FPC circuit boards, which can achieve flexible bending in a large size range, but it is difficult to achieve stretchable functions, and when the product size is small, its bending recovery ability is poor. The new flexible circuit preparation methods, such as 3D printing, inkjet printing, etc., use conductive silver paste, liquid metal, etc. Good electrical conductivity is achieved, and the resistance increases significantly when stretched, which affects the normal operation of components.

Contents of the invention

In order to keep the resistance of the small-sized circuit stable when it is bent and stretched, the present application provides a flexible and stretchable circuit, a preparation method thereof, and an electronic device.

A flexible and stretchable circuit provided by the application, its preparation method, and electronic equipment adopt the following technical solutions:

In the first aspect, a flexible and stretchable circuit includes:

Flexible stretchable substrate;

A wire unit, the wire unit includes an intermediate wire, a positive electrode wire and a negative electrode wire connected to the intermediate wire, and the intermediate wire includes a plurality of first wires all arranged in a serpentine shape and a plurality of first wires all arranged in a serpentine shape A plurality of the first conducting wires extend along the first direction and are arranged at intervals in the second direction, and a plurality of the second conducting wires extend along the second direction and are arranged at intervals in the first direction, the The first wire and the second wire intersect and are connected to form a plurality of blank areas distributed in arrays, and a plurality of the first wires are interrupted to form a first connection point and a second connection point, and the first connection point and the second Between the connection points is the connection area;

a plurality of components, the components are in one-to-one correspondence with the connection area, and the positive and negative poles of the components are in one-to-one correspondence with the first connection point and the second connection point and are connected; and,

The package is arranged on the flexible and stretchable substrate, the wire unit and each of the components are covered in the package, and the material of the package is a flexible and stretchable material.

By adopting the above technical solution, the first wire and the second wire are arranged in a serpentine shape, and a large cumulative deformation can be obtained through the local small deformation of the first wire and the second wire, which can realize the flexibility of the circuit in a small size range Bending can be stretched, and when stretched, the first wire and/or the second wire is stretched and deformed to have a longer trace length, but the cross-sectional area does not change, so that the resistance value of the circuit can remain stable, which can Realize the stable light emission of small-sized circuits when they are bent and stretched.

Wherein, the first wire is discontinuous to form a connection area connected with components, and the second wire remains continuous and uninterrupted, so that when the circuit is stretched and deformed in the second direction, the stretching deformation can be quickly transmitted to various parts of the second wire, and in When stretching and deforming in the second direction, the pull on the connection point between the first wire and the component can be reduced, thereby reducing the probability of circuit damage.

Preferably, the discontinuous ends of each of the first wires are bent in a direction away from the flexible stretchable substrate to form a bent portion, and then bent in a direction parallel to the flexible stretchable substrate to form a support portion , the component is connected to the support part.

By adopting the above technical solution, the bent portion is wrapped by the encapsulation layer, which can improve the supporting ability of the supporting portion to the components, and facilitate the welding of the components and the supporting portion. The components are connected to the supporting part, and the width or cross-sectional area of the first wire part adhered to the flexible and stretchable substrate can be set according to the resistance value required by the circuit, regardless of whether it is convenient to weld with the components. By arranging the bending part, when the circuit is stretched and deformed in the first direction, the pull on the connection point between the supporting part and the component can be reduced, thereby reducing the probability of circuit damage.

Preferably, the first wires between every two adjacent second wires are intermittently formed with a connection area.

By adopting the above technical solution, the number of installed components can be increased.

Preferably, the components are LED chips.

By adopting the above technical scheme, the LED chip can emit visible light of a certain wavelength to play a therapeutic effect; the first wires between every two adjacent second wires are intermittently formed with a connection area. The number of LED installations can be increased, the light output power can be increased, and the therapeutic effect can be improved.

Preferably, the cross-sectional area of the first wire and the second wire is gradually increased from the middle to both ends.

By adopting the above technical solution, the smaller the cross-sectional area of the first wire and the second wire is, the easier it is to deform, so that the middle part of the first wire and the second wire is easier to deform than the end, and try to balance the first wire and the second wire. The tensile deformation of each part of the wire makes the components evenly distributed; the components are LED chips to achieve uniform light output and avoid local light output intensity being too strong or too weak after the circuit is stretched.

Preferably, both the positive lead wire and the negative lead lead are serpentine and extend along the first direction, the positive lead wire, the intermediate lead wire and the negative lead lead are sequentially spaced apart in the second direction, a plurality of The second lead is alternately connected to the positive lead and the negative lead.

By adopting the above-mentioned technical scheme, each component is located between two adjacent second wires, so that the positive and negative poles of each component are connected to the second wire, and in every two adjacent second wires, one of the second wires It is connected to the positive wire, and the other second wire is connected to the negative wire, so that each component is directly connected to the positive wire and the negative wire, so that the components are connected in parallel without affecting each other, and avoid damage to one component affecting other components. Work. When the components are LED chips, according to whether each LED chip emits light normally, it is convenient to quickly check and repair the faults in the circuit.

Preferably, the cross-sectional area of the positive electrode wire and the negative electrode wire increases gradually from the middle to both ends.

By adopting the above technical solution, the smaller the cross-sectional area of the positive and negative leads, the easier it is to deform, so that the middle part of the positive and negative leads is easier to deform than the end, and the stretching of each part of the flexible and stretchable substrate can be balanced as much as possible. The amount of deformation, so that the connection points of each component and the wire unit are pulled more evenly, so as to avoid excessive deformation of a certain component and easy damage. At the same time, the components are evenly distributed, and the components are LED chips to achieve uniform light output and avoid local light output intensity being too strong or too weak after the circuit is stretched.

Preferably, the wire unit is integrally formed.

By adopting the above technical scheme, the conductive plate is cut to facilitate the processing and production of the wire unit, to ensure the integrity of the entire wire unit, thereby ensuring the conductivity of each position of the wire unit, and to produce the same width or cross-sectional area of each part. The wire unit can also control the width or cross-sectional area of each part of the wire unit according to actual needs.

In the second aspect, the present application also provides a method for preparing a flexible and stretchable circuit, comprising the following steps:

S1: Prepare a wire unit, the wire unit includes an intermediate wire, a positive electrode wire and a negative electrode wire connected to the intermediate wire, and the intermediate wire includes a plurality of first wires all arranged in a serpentine shape and a plurality of serpentine wires. A plurality of second conducting wires arranged in a shape, a plurality of the first conducting wires all extend along the first direction and are arranged at intervals in the second direction, and a plurality of the second conducting wires all extend along the second direction and are arranged at intervals in the first direction , the first wires and the second wires intersect and are connected to form a plurality of blank areas distributed in arrays, a plurality of the first wires are interrupted to form a first connection point and a second connection point, and the first connection point and the second connection point is a connection region; and,

S2: Provide a flexible and stretchable substrate, adhere the wire unit to the flexible and stretchable substrate; attach each component to each of the connection areas, connect the positive and negative electrodes of the component to One-to-one correspondence with the first connection point and the second connection point and welding; use a flexible stretchable material to package the wire unit and the components to form a flexible stretchable substrate on the flexible stretchable substrate, And wrapping the package body of the wire unit and the components.

By adopting the above technical solution, the first wire and the second wire are arranged in a serpentine shape, and a large cumulative deformation can be obtained through the local small deformation of the first wire and the second wire, which can realize the flexibility of the circuit in a small size range Bending can be stretched, and when stretched, the first wire and/or the second wire is stretched and deformed to have a longer trace length, but the cross-sectional area does not change, so that the resistance value of the circuit can remain stable, which can Realize the stable light emission of small-sized circuits when they are bent and stretched.

Wherein, the first wire is discontinuous to form a connection area connected with components, and the second wire remains continuous and uninterrupted, so that when the circuit is stretched and deformed in the second direction, the stretching deformation can be quickly transmitted to various parts of the second wire, and in When stretching and deforming in the second direction, the pull on the connection point between the first wire and the component can be reduced, thereby reducing the probability of circuit damage.

Preferably, in step S1, the step of preparing the wire unit is: providing a conductive plate, and cutting the conductive plate according to a preset pattern to form the wire unit.

By adopting the above technical scheme, the conductive plate is cut to facilitate the processing and production of the wire unit, to ensure the integrity of the entire wire unit, thereby ensuring the conductivity of each position of the wire unit, and to produce the same width or cross-sectional area of each part. The wire unit can also control the width or cross-sectional area of each part of the wire unit according to actual needs.

Preferably, in step S1, the conductive plate is cut so that the first connection point and the second connection point respectively extend in opposite directions to form an extension piece, and the extension piece faces away from the flexible The stretchable substrate is bent in a direction to form a bent portion, and then bent in a direction parallel to the flexible stretched substrate to form a support portion;

In step S2, after the wire unit is adhered to the flexible and stretchable substrate, the bent portion is packaged to form a flexible stretchable substrate that covers the bent portion. part and expose the first packaging layer of the support part; attach the component to the support part, weld the component and the support part; perform welding on the support part and the component encapsulating to form a second encapsulation layer on the first encapsulation layer.

By adopting the above technical solution, the bent part is wrapped by the first encapsulation layer, which can improve the supporting ability of the supporting part to the component, and facilitate the welding of the component and the supporting part. The components are connected to the supporting part, and the width or cross-sectional area of the first wire part adhered to the flexible and stretchable substrate can be set according to the resistance value required by the circuit, regardless of whether it is convenient to weld with the components. By arranging the bending part, when the circuit is stretched and deformed in the first direction, the pull on the connection point between the supporting part and the component can be reduced, thereby reducing the probability of circuit damage.

Preferably, in step S1, the conductive plate is cut so that the positive wire and the negative wire are serpentine and extend along the first direction, and the positive wire, the intermediate wire and the The negative lead wires are spaced sequentially in the second direction, and a plurality of the second lead wires are alternately connected to the positive lead wires and the negative lead wires.

By adopting the above-mentioned technical scheme, each component is located between two adjacent second wires, so that the positive and negative poles of each component are connected to the second wire, and in every two adjacent second wires, one of the second wires It is connected to the positive wire, and the other second wire is connected to the negative wire, so that each component is directly connected to the positive wire and the negative wire, so that the components are connected in parallel without affecting each other, and avoid damage to one component affecting other components. Work. When the components are LED chips, it is convenient to quickly check and repair the faults in the circuit according to whether each component emits light normally.

In a third aspect, the present application also provides an electronic device, including the flexible and stretchable circuit described in any one of the above items.

By adopting the above technical solution, the first wire and the second wire are arranged in a serpentine shape, and a large cumulative deformation can be obtained through the local small deformation of the first wire and the second wire, which can realize the flexibility of the circuit in a small size range Bending can be stretched, and when stretched, the first wire and/or the second wire is stretched and deformed to have a longer trace length, but the cross-sectional area does not change, so that the resistance value of the circuit can remain stable, which can Realize the stable light emission of small-sized circuits when they are bent and stretched.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The first wire and the second wire are set in a serpentine shape, and a large cumulative deformation can be obtained through the local slight deformation of the first wire and the second wire, which can realize the flexible bending and stretching of the circuit in a small size range , and when stretched, the first wire and/or the second wire is stretched and deformed to have a longer trace length, but the cross-sectional area does not change, so that the resistance value of the circuit can be kept stable, and a small-sized circuit can be realized Steady glow when bent and stretched.

2. The first wire is interrupted to form a connection area connected to the component, and the second wire remains continuous and uninterrupted, so that when the circuit is stretched and deformed in the second direction, the stretching deformation can be quickly transmitted to various parts of the second wire, and in When stretching and deforming in the second direction, the pull on the connection point between the first wire and the component can be reduced, thereby reducing the probability of circuit damage.

3. The components are LED chips, and the LED chips can emit visible light of a certain wavelength to play a therapeutic effect; every first wire between two adjacent second wires is intermittently formed with a connection area. The number of LED installations can be increased, the light output power can be increased, and the therapeutic effect can be improved.

Description of drawings

Figure 1 is a top view of the flexible and stretchable circuit (components and packages are hidden) in Example 1 of the present application;

Figure 2 is a top view of the flexible and stretchable circuit (with the package hidden) in Example 1 of the present application;

Fig. 3 is a schematic cross-sectional structure diagram of the flexible and stretchable circuit in Example 1 of the present application;

Fig. 4 is a partially enlarged schematic diagram of place A in Fig. 3;

Fig. 5 is a schematic cross-sectional structure diagram of a flexible and stretchable circuit in Example 2 of the present application;

Fig. 6 is a schematic cross-sectional structure diagram of the flexible and stretchable circuit in Example 3 of the present application;

Fig. 7 is a schematic cross-sectional structure diagram of the flexible and stretchable circuit in Example 5 of the present application;

Fig. 8 is a partially enlarged schematic diagram of place B in Fig. 7;

Fig. 9 is a schematic structural view of the wire unit in Embodiment 6 of the present application;

Fig. 10 is a partially enlarged schematic diagram of place C in Fig. 9;

FIG. 11 is a schematic cross-sectional structure diagram of the flexible and stretchable circuit in Embodiment 8 of the present application.

Explanation of reference numerals: 1. flexible and stretchable substrate; 2. wire unit; 21. middle wire; 211. first wire; 211a. first connection point; 211b. second connection point; 212. second wire; 213. Blank area; 214. Connection area; 215. Bending part; 216. Supporting part; 217. Extension sheet; 22. Positive lead; 23. Negative lead; 3. Components; 4. Package; 41. First encapsulation layer; 42, second encapsulation layer; 5, fabric; 51, hardened area.

detailed description

The present application will be described in further detail below in conjunction with accompanying drawings 1-10.

Embodiments of the present application provide a flexible and stretchable circuit and an electronic device. The electronic device includes a flexible and stretchable circuit. The electronic device can be worn on the fingers and wrists for treating arthritis, etc.; it can be worn on the stomach for treating Stretch marks, etc.; it can be worn on the neck to treat neck lines, etc. Electronic devices can also be other devices that need to be bent and stretched, and there is no limitation here. The innovation of the present application lies in the flexible and stretchable circuit, and the flexible and stretchable circuit will be described in detail below.

Example 1

This embodiment discloses a flexible and stretchable circuit. The flexible and stretchable circuit includes a flexible and stretchable substrate 1 , a wire unit 2 , a plurality of components 3 and a packaging body 4 .

Referring to Fig. 1, the flexible and stretchable substrate 1 is a sheet structure, which can be rectangular, square or other shapes, and is made of an elastic polymer material, which is flexible, stretchable and non-conductive. The polymer material can be but not Limited to polydimethylsiloxane PDMS, polyurethane PU, thermoplastic polyurethane TPU, thermoplastic vulcanizate TPV, silicone, etc.

The wire unit 2 includes an intermediate wire 21 , a positive electrode wire 22 and a negative electrode wire 23 both connected to the intermediate wire 21 . There can be one or more connection points between the positive lead wire 22 and the middle lead wire 21, and the positive lead lead 22 is used for positive connection with other circuits; It is used to connect with the negative pole of other circuits, so as to realize the conduction of the circuit.

Since electronic equipment is generally used at room temperature, the material of the wire unit 2 can be a solid material with conductivity at room temperature, such as metal, flexible graphite, etc., and the metal can be but not limited to gold, silver, aluminum, copper, etc. In this embodiment, the wire unit 2 is integrally formed, and a whole conductive plate is cut according to the required shape of the wire unit 2 to obtain an integrally formed wire unit 2, which is convenient for processing and producing the wire unit 2, ensuring The integrity of the entire wire unit 2, so as to ensure the conductivity of each position of the wire unit 2; at the same time, wire units 2 with the same width or cross-sectional area of each part can be produced, and the width or width of each part of the wire unit 2 can also be adjusted according to actual needs. The cross-sectional area is controlled.

In this embodiment, the wire unit 2 is made of copper sheet. The copper sheet has good conductivity and low price, which can reduce the production cost. The copper sheet has poor hardness and is easy to cut.

The intermediate conducting wire 21 includes a plurality of first conducting wires 211 arranged in a serpentine shape and a plurality of second conducting wires 212 arranged in a serpentine shape, and the plurality of first conducting wires 211 extend along the first direction and are arranged at intervals in the second direction A plurality of second conducting wires 212 extend along the second direction and are arranged at intervals in the first direction, and the first conducting wires 211 and the second conducting wires 212 intersect and connect to form a plurality of blank areas 213 distributed in an array.

Referring to FIG. 1 , a plurality of first wires 211 are intermittently formed to form a first connection point 211a and a second connection point 211b , and a connection area 214 is formed between the first connection point 211a and the second connection point 211b . Referring to Fig. 2, the component 3 corresponds to the connection area 214 one by one, and the positive and negative poles of the component 3 correspond to and are connected to the first connection point 211a and the second connection point 211b. In an optional embodiment, the first The connection point 211a and the second connection point 211b can be arranged in a square shape, which is convenient for connection with the component 3 .

Referring to Fig. 3 and Fig. 4, the package body 4 is arranged on the flexible and stretchable substrate 1, the wire unit 2 and the components 3 are wrapped in the package body 4, the wire unit 2 can be connected with other circuits and then packaged in the package body 4 within. The material of the package body 4 is a flexible and stretchable material, which is made of an elastic polymer material, which has flexible, stretchable and non-conductive properties. The polymer material can be but not limited to polydimethylsiloxane PDMS, polyurethane PU , thermoplastic polyurethane TPU, thermoplastic vulcanizate TPV, silicone, etc. In this embodiment, the materials of the flexible and stretchable substrate 1 and the packaging body 4 are both polydimethylsiloxane PDMS.

The first wire 211 and the second wire 212 are arranged in a serpentine shape, and the flexible and stretchable substrate 1 is stretched in the first direction or the second direction, and the local micro deformation of the first wire 211 or the second wire 212 can obtain The large cumulative deformation can realize the flexible bending and stretching of the circuit in a small size range. When stretched, the first conductive wire 211 and/or the second conductive wire 212 are stretched and deformed to have a longer trace length, but the cross-sectional area does not change, so that the resistance value of the circuit can be kept stable, and a small-sized circuit can be realized Normal operation of components during bending and stretching.

Wherein, the first wire 211 is intermittently formed to connect the connection area 214 connected with the component 3, and the second wire 212 remains continuous and uninterrupted, so that when the circuit is stretched and deformed in the second direction, the stretching deformation can be quickly transferred to the second wire 212. various parts, and when stretched and deformed in the second direction, the pull on the connection point between the first wire 211 and the component 3 can be reduced, thereby reducing the probability of circuit damage.

The included angle between the first direction and the second direction may be an acute angle or a right angle. In this embodiment, the first direction is perpendicular to the second direction, and when the circuit is stretched in the second direction, the stretching amount of the first wire 211 can be reduced, reducing the impact on the connection of the components 3 .

Referring to FIG. 2 , the first wires 211 between every two adjacent second wires 212 can be interrupted at multiple points and connected to multiple components 3 ; they can also be uninterrupted and not connected to the components 3 . In this embodiment, the first wires 211 between every two adjacent second wires 212 are intermittently formed with a connection area 214 , and each connection area 214 is connected with a component 3 , which can increase the number of components 3 installed. The component 3 can be any component 3. In this embodiment, the component 3 is an LED chip, and the LED chip can emit visible light of a certain wavelength to play a therapeutic role. Increasing the number of LED chips can increase the light output power and improve Therapeutic effects of electronic devices.

Example 2

Referring to FIG. 5 , the difference between Embodiment 2 and Embodiment 1 is that the positive lead wire 22 and the negative lead wire 23 are serpentine and extend along the first direction, and the positive lead wire 22, the middle lead wire 21 and the negative lead wire 23 are in the second direction. At intervals in sequence, a plurality of second wires 212 are alternately connected to the positive wire 22 and the negative wire 23 .

Each component 3 is located between two adjacent second wires 212, so that the positive and negative poles of each component 3 are connected to the second wire 212, and in every two adjacent second wires 212, one of the second wires 212 It is connected to the positive wire 22, and another second wire 212 is connected to the negative wire 23, so that each component 3 is directly connected to the positive wire 22 and the negative wire 23, so that each component 3 is connected in parallel without affecting each other, avoiding a certain component. Damage to the device 3 affects the normal operation of other components 3 . The components 3 are LED chips, and according to whether each LED chip emits light normally, it is convenient to quickly check and repair the faults in the circuit.

Example 3

Referring to Figure 6, the difference between embodiment 3 and embodiment 2 is that the angle between the first direction and the second direction is an acute angle, and when the circuit is stretched in the second direction or the first direction, the The first wire 211 and the second wire 212 are stretched and deformed at the same time, which increases the area of the circuit, thereby increasing the treatment area. When stretching the circuit, it is necessary to increase the width of the circuit in both the first direction and the second direction, setting the angle between the first direction and the second direction as an acute angle can simplify the stretching operation of the circuit, Stretching of the circuit in two directions is achieved simultaneously.

Example 4

The difference between Embodiment 4 and Embodiment 2 lies in that the cross-sectional areas of the positive lead wire 22 , the negative lead wire 23 , the first lead wire 211 and the second lead wire 212 are gradually increased from the middle to both ends. It can be understood that the smaller the cross-sectional area of the positive wire 22, the negative wire 23, the first wire 211 and the second wire 212, the easier it is to deform, so that the positive wire 22, the negative wire 23, the first wire 211 and the second wire The middle part of 212 is more easily deformed than the end, and the tensile deformation of each position of the positive lead wire 22, the negative lead wire 23, the first lead wire 211 and the second lead wire 212 can be balanced as far as possible, so that the connection points of each component parts 3 and the lead wire unit 2 are subjected to The pulling is relatively uniform, so as to avoid excessive deformation and easy damage of a certain component 3 . At the same time, the components 3 are evenly distributed, and the components 3 are LED chips, so as to realize a uniform light output and avoid local light output intensity being too strong or too weak after the circuit is stretched.

Example 5

7 and 8, the difference between Embodiment 5 and Embodiment 2 is that the discontinuous ends of the first conductive wires 211 are bent toward the direction away from the flexible and stretchable substrate 1 to form a bent portion 215, and then toward The supporting part 216 is formed by bending in a direction parallel to the flexible tensile substrate, and the component 3 is connected to the supporting part 216 . The bent portion 215 is wrapped by the package body 4 , which can improve the supporting ability of the supporting portion 216 to the component 3 , and facilitate the welding of the component 3 and the supporting portion 216 . The component 3 is connected to the support part 216, and the width or cross-sectional area of the first wire 211 attached to the flexible and stretchable substrate 1 can be set according to the resistance value required by the circuit, without considering whether it is convenient to integrate with the component 3 welding. By providing the bending portion 215, when the circuit is stretched and deformed in the first direction, the pull on the connection point between the support portion 216 and the component 3 can be reduced, thereby reducing the probability of circuit damage.

Example 6

Referring to Fig. 9 and Fig. 10, the difference between Embodiment 6 and Embodiment 2 is that the side of the flexible and stretchable substrate 1 facing away from the wire unit 2 is fixed with a woven fabric 5, and the woven fabric 5 is connected with the bent portion 215 and The position corresponding to the supporting part 216 is the hardened area 51, and the woven fabric 5 can be hardened by dripping cured glue, etc. When the circuit is stretched, the hardened area 51 of the woven fabric 5 has no elasticity, so that it is incompatible with the hardened area 51 of the woven fabric 5. The corresponding part of the flexible and stretchable substrate 1 cannot be stretched, which can reduce the pulling on the bending part 215 and the supporting part 216, so that the connection between the component 3 and the wire unit 2 will not be affected by the stretching, Thereby reducing the chance of circuit damage. At the same time, the woven fabric 5 can enhance the structural strength of the whole circuit, and the elasticity of the woven fabric 5 is helpful for the rebound of the whole circuit after being stretched.

Example 7

This embodiment provides a method for preparing a flexible and stretchable circuit, comprising the following steps:

S1: prepare the wire unit 2, the wire unit 2 includes an intermediate wire 21, a positive electrode wire 22 and a negative electrode wire 23 connected to the intermediate wire 21, the intermediate wire 21 includes a plurality of first wires 211 arranged in a serpentine shape and a plurality of The second conducting wires 212 arranged in a serpentine shape, the plurality of first conducting wires 211 all extend along the first direction and are arranged at intervals in the second direction, and the plurality of second conducting wires 212 all extend along the second direction and are arranged at intervals in the first direction Set, the first conducting wire 211 and the second conducting wire 212 intersect and connect to form a plurality of blank areas 213 distributed in arrays, at least one first conducting wire 211 intermittently forms a first connection point 211a and a second connection point 211b, and the first connection point 211a There is a connection area 214 between the second connection point 211b and the second connection point 211b.

In an optional embodiment, the wire unit 2 can be manufactured by bending and welding a plurality of conductive wires. In this embodiment, the step of preparing the wire unit 2 is: providing a conductive plate, and cutting the conductive plate according to a preset pattern, ie, the pattern of the wire unit 2 to form the wire unit 2 . The wire unit 2 formed by cutting the conductive plate is integrally formed. The material of the conductive plate is a conductive solid material, which can be metal, flexible graphite, etc., and the metal can be but not limited to gold, silver, aluminum, copper, etc. In this embodiment, the conductive plate is a copper sheet, and the thickness of the copper sheet is 70 microns, and the copper sheet is cut with a laser to form a designed wire unit 2 pattern.

The width of each part of the wire unit 2 can be controlled by cutting, and the thickness of each part of the wire unit 2 can also be controlled. If the thickness of the conductive plate is uniform, the cross-sectional area of each part can be controlled by controlling the width of each part of the wire unit 2 .

The pattern of the wire unit 2 can be various. In an optional embodiment, the positive wire 22 and the negative wire 23 are serpentine and extend along the first direction, and the positive wire 22, the middle wire 21 and the negative wire 23 are in the second The directions are sequentially spaced, and a plurality of second wires 212 are alternately connected to the positive wire 22 and the negative wire 23 . The angle between the first conducting wire 211 and the second conducting wire 212 may be an acute angle or a right angle.

S2: Provide a flexible and stretchable substrate 1. The flexible and stretchable substrate 1 is a sheet-like structure made of an elastic polymer material with flexible, stretchable and non-conductive properties. The polymer material can be but not limited to poly Dimethylsiloxane PDMS, polyurethane PU, thermoplastic polyurethane TPU, thermoplastic vulcanizate TPV, silicone, etc.

In this example, the PDMS premixed solution with a volume ratio of 20:1 is mixed with the solidified solution, and mechanically stirred at a stirring speed of 800r/min, and the stirring time is 10min. After uniform stirring, vacuum degassing; The defoamed PDMS was formed into a film, and a PDMS substrate with a thickness of 2mm was prepared on the substrate; the prepared PDMS substrate was put into a blast drying oven for curing, the curing temperature was 95°C, and the curing time was 180min.

Adhere the wire unit 2 to the flexible and stretchable substrate 1. Specifically, place the prepared wire unit 2 on a clean table, and buckle the PDMS substrate upside down on the wire unit 2. The viscosity of the PDMS surface The entire wire unit 2 can be firmly adhered to its surface.

Each component 3 is attached to each connection area 214 , and the positive and negative poles of the component 3 correspond to the first connection point 211 a and the second connection point 211 b one by one and are soldered. Specifically, the component 3 is an LED chip, and the PDMS substrate to which the wire unit 2 is adhered is placed, and the LED chip is pasted on the connection area 214 of the wire unit 2 with a placement machine, and then the LED chip is firmly welded to the wire by reflow soldering. Unit 2 on.

The wire unit 2 and the components 3 are packaged with a flexible stretchable material to form a package body 4 located on the flexible and stretchable substrate 1 and covering the wire unit 2 and the components 3 . Transfer the soldered circuit to a vacuum plasma cleaning machine to clean the PDMS and the surface of the circuit; put the cleaned circuit into a mold and encapsulate it with silica gel with a thickness of 5mm.

The preparation method of the flexible and stretchable circuit provided in this embodiment can be used to make the flexible and stretchable circuit provided in the above-mentioned embodiments 1-4.

Example 8

Referring to FIG. 11 , the difference between embodiment 8 and embodiment 7 is that in step S1, the conductive plate is cut so that the first connection point 211a and the second connection point 211b extend in opposite directions to form extension pieces 217 The extension piece 217 is bent in a direction away from the flexible stretchable substrate 1 to form a bent portion 215 , and then bent in a direction parallel to the flexible stretchable substrate to form a support portion 216 .

In step S2, after the wire unit 2 is adhered to the flexible and stretchable substrate 1, the bent portion 215 is packaged to form a flexible and stretchable substrate 1 that covers the bent portion 215 and exposes the support portion. 216 of the first encapsulation layer 41; the components 3 are attached to the support portion 216, and the components 3 and the support portion 216 are welded; the support portion 216 and the components 3 are packaged to form the second encapsulation layer 42 The second encapsulation layer 42 (see FIG. 8 ).

The bent portion 215 is wrapped by the first encapsulation layer 41 , which can improve the supporting ability of the supporting portion 216 to the component 3 , and facilitate the welding of the component 3 and the supporting portion 216 . The component 3 is connected to the support part 216, and the width or cross-sectional area of the first wire 211 attached to the flexible and stretchable substrate 1 can be set according to the resistance value required by the circuit, without considering whether it is convenient to integrate with the component 3 welding. By providing the bending portion 215, when the circuit is stretched and deformed in the first direction, the pull on the connection point between the support portion 216 and the component 3 can be reduced, thereby reducing the probability of circuit damage.

The preparation method of the flexible and stretchable circuit provided in this embodiment can be used to make the flexible and stretchable circuit provided in the above-mentioned embodiment 5.

Example 9

The difference between Example 9 and Example 7 is that in step S2, the PDMS premix solution with a volume ratio of 10:1 is mixed with the solidified solution, and mechanically stirred at a stirring speed of 500 r/min for 15 minutes , after stirring evenly, vacuum defoaming; Spin-coat the degassed PDMS by a spin coater, and spin-coat a PDMS substrate with a thickness of 0.2mm on the substrate; put the spin-coated PDMS including the substrate into a blast drying oven For curing, the curing temperature is 105°C, and the curing time is 30 minutes; PDMS is used for packaging, and the packaging thickness is 3mm.

All of the above are preferred embodiments of the application, and are not intended to limit the protection scope of the application. Therefore, all equivalent changes made according to the structure, shape, and principle of the application should be covered by the protection scope of the application. Inside.

Claims (10)

1. A flexible and stretchable circuit, characterized in that, comprising: flexible stretchable substrate (1); A wire unit (2), the wire unit (2) comprising an intermediate wire (21), a positive wire (22) and a negative wire (23) connected to the middle wire (21), the middle wire (21) It includes a plurality of first conducting wires (211) arranged in a serpentine shape and a plurality of second conducting wires (212) arranged in a serpentine shape, the plurality of first conducting wires (211) all extend along the first direction and The plurality of second conducting wires (212) extend along the second direction and are arranged at intervals in the first direction, the first conducting wires (211) and the second conducting wires (212) cross and Connect and form a plurality of blank areas (213) distributed in an array, a plurality of the first wires (211) intermittently form a first connection point (211a) and a second connection point (211b), and the first connection point (211a ) and the second connection point (211b) is a connection area (214); A plurality of components (3), the components (3) correspond to the connection area (214) one by one, the positive and negative poles of the components (3) are connected to the first connection point (211a), the first The two connection points ( 211b ) are in one-to-one correspondence and connected; and, The package body (4) is arranged on the flexible and stretchable substrate (1), the wire unit (2) and each of the components (3) are covered in the package body (4), the The material of the package body (4) is a flexible and stretchable material. 2. The flexible and stretchable circuit according to claim 1, characterized in that, the discontinuous ends of each of the first wires (211) are bent in a direction away from the flexible and stretchable substrate (1) to form a bending part (215), and then bending toward a direction parallel to the flexible tensile substrate to form a supporting part (216), and the component (3) is connected to the supporting part (216); and/or, The first conductive wires (211) between every two adjacent second conductive wires (212) are intermittently formed with a connecting region (214); and/or, The component (3) is an LED chip; and/or, The cross-sectional area of the first conducting wire (211) and the second conducting wire (212) is gradually increased from the middle to both ends. 3. The flexible and stretchable circuit according to claim 1, characterized in that, both the positive lead (22) and the negative lead (23) are serpentine and extend along the first direction, and the positive The wire (22), the intermediate wire (21) and the negative wire (23) are sequentially spaced apart in the second direction, and a plurality of the second wires (212) are alternately connected to the positive wire (22), The negative lead wire (23) is connected. 4. The flexible and stretchable circuit according to claim 3, characterized in that, the cross-sectional area of the positive electrode wire (22) and the negative electrode wire (23) gradually increases from the middle part to both ends. 5. The flexible and stretchable circuit according to any one of claims 1 to 4, characterized in that, the wire unit (2) is integrally formed. 6. A method for preparing a flexible and stretchable circuit, comprising the following steps: S1: Prepare the wire unit (2), the wire unit (2) includes the middle wire (21), the positive wire (22) and the negative wire (23) connected to the middle wire (21), the middle wire (21) comprising a plurality of first conductive wires (211) arranged in a serpentine shape and a plurality of second conductive wires (212) arranged in a serpentine shape, and the plurality of first conductive wires (211) all extend along the first direction and arranged at intervals in the second direction, a plurality of the second conducting wires (212) extend along the second direction and are arranged at intervals in the first direction, the first conducting wires (211) and the second conducting wires (212) ) are intersected and connected to form a plurality of blank areas (213) distributed in an array, and a plurality of the first wires (211) are intermittently formed to form a first connection point (211a) and a second connection point (211b), and the first connection between the point (211a) and the second connection point (211b) is a connection area (214); and, S2: Provide a flexible and stretchable substrate (1), adhere the wire unit (2) to the flexible and stretchable substrate (1); mount each component (3) on each of the The connection area (214), where the positive and negative poles of the component (3) are in one-to-one correspondence with the first connection point (211a) and the second connection point (211b) and welded; using a flexible stretchable material to The wire unit (2) and the components (3) are packaged to form a flexible and stretchable substrate (1) that covers the wire unit (2) and the components (3) ) of the package (4). 7. The method for preparing a flexible and stretchable circuit according to claim 6, characterized in that, in step S1, the step of preparing the wire unit (2) is: providing a conductive plate, and performing a pre-set pattern on the conductive plate cutting to form the wire unit (2). 8. The method for preparing a flexible and stretchable circuit according to claim 7, characterized in that, in step S1, the conductive plate is cut so that the first connection point (211a) and the second connection point The points (211b) extend in opposite directions to form extension pieces (217), and the extension pieces (217) are bent in a direction away from the flexible and stretchable substrate (1) to form a bent portion (215) , and then bent toward a direction parallel to the flexible stretched substrate to form a support portion (216); In step S2, after the wire unit (2) is adhered to the flexible and stretchable substrate (1), the bending part (215) is packaged to form a The first encapsulation layer (41) on the bottom (1), covering the bending part (215) and exposing the support part (216); attaching the component (3) to the support part ( 216), welding the component (3) and the support part (216); packaging the support part (216) and the component (3) to form a 41) on the second encapsulation layer (42). 9. The method for preparing a flexible and stretchable circuit according to claim 7, characterized in that, in step S1, the conductive plate is cut so that the positive wire (22) and the negative wire (23) are serpentine and extend along the first direction, the positive wire (22), the intermediate wire (21) and the negative wire (23) are sequentially spaced apart in the second direction, and a plurality of the first The two wires (212) are alternately connected to the positive wire (22) and the negative wire (23). 10. An electronic device, characterized by comprising the flexible and stretchable circuit according to any one of claims 1 to 5.

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