JP7245011B2 - Electronic parts and display devices - Google Patents

Description

The present invention relates to electronic components and display devices.

In recent years, wearable terminals are becoming popular. Wearable terminals are used for various purposes and applications, such as health management by measuring sleep, number of steps, and amount of exercise, or notification of incoming calls in conjunction with a smartphone or the like.
As a wearable terminal, in particular, a terminal that is worn directly on the body by a technique such as direct attachment to the skin is sometimes required to have stretchability in order to follow the movement of the body. For this reason, the substrates and wiring that realize wearable terminals are also required to have stretchability.

Conventionally, stretchable wiring, that is, stretchable wiring, includes a conductive elastomer, a curved wiring as described in Patent Document 1, or a wiring that is attached to a pre-stretched rubber substrate and contracted. , a pre-stretch structure for releasing from a stretched state, and the like.
Conductive elastomers have low conductivity and large resistance changes during expansion and contraction, so it is not easy to ensure stable operation of the terminal.
The curved wiring of Patent Document 1 may be damaged due to elongation or repeated deformation.
Even in the pre-stretched structure, as long as metal is used as the raw material for the wiring, there is a limit to how much stress can be relieved, so there is a possibility that damage will occur due to elongation or repeated deformation.

On the other hand, Patent Literature 2 discloses an expandable wiring having a structure in which a conductor is wound around the peripheral surface of an elastic filament. This structure has a larger elongation at break than structures such as the curved wiring and the pre-stretched structure, in which the wiring is expanded and contracted in a two-dimensional plane, and has excellent followability to a three-dimensional curved surface.

JP 2016-219782 A JP 2016-129121 A JIS B2704-1:2018

However, even in the expandable wiring described in Patent Document 2, strain is generated between the filamentous body and the conductor during expansion and contraction, and there is a possibility of breakage.
An expandable wiring is desired that can reduce the strain between the conductor wiring and the supporting material that supports it, thereby reducing the possibility of breakage.

The problem to be solved by the present invention is to provide an electronic component and a display device equipped with expandable wires that can reduce the possibility of cracks by reducing strain between conductor wires and supporting materials that support them. to provide.

In order to solve the above problems, the present invention employs the following means. That is, the present invention includes a support member formed of an insulating material having elasticity, a conductor wiring spirally wound around an axis extending in one direction, and having at least the inner side supported by the support member, and an elastic substrate in which the expandable wiring is embedded.
According to the configuration as described above, since the expandable wiring includes the supporting material formed of the insulating material having elasticity and the conductor wiring wound helically, a tensile force acts in the axial direction. It stretches easily when strained and contracts to its original shape when the tensile force is released. Since the conductor wiring is spirally wound, the elongation at break is greater than that of a structure in which the wiring is expanded and contracted within a two-dimensional plane, and the conformability to a three-dimensional curved surface is also excellent.
The expandable wiring as described above is embedded in an elastic substrate to form an electronic component, and the electronic component can be realized so that the circumference of the conductor wiring is in contact with the substrate and the support material widely. While the electronic component as a whole has good stretchability, the stress generated between the conductor wiring and the surrounding substance during elongation and contraction is widely distributed, and the possibility of cracks occurring can be reduced.

In one aspect of the present invention, the substrate is made of the same material as the supporting material.
According to the configuration as described above, it is possible to realize the expandable wiring so that the circumference of the conductor wiring is in contact with the substrate and the supporting member, which are the same material. Therefore, even when the supporting material or the substrate is stretched and then shrunk back to its original shape, it is possible to suppress the concentration of stress on the contact interface between different materials, which can occur when different materials are used. That is, since the concentration of stress on a specific portion of the support material or substrate is suppressed, it is possible to reduce the occurrence of peeling at the interface between the support material or substrate and the conductor wiring and the breakage of the conductor wiring.

In another aspect of the present invention, the material of the conductor wiring is any one of copper, gold, silver, aluminum, titanium, molybdenum, tungsten, nickel, iron, and alloys thereof.
According to the configuration as described above, it is possible to appropriately realize the expandable wiring as described above.

In another aspect of the invention, said support material is an elastomer.
According to the configuration as described above, it is possible to appropriately realize the expandable wiring as described above.

In another aspect of the present invention, the expandable wiring includes a plurality of the conductor wirings, and the plurality of the conductor wirings are provided in a multiple spiral structure spaced apart in the one direction.
According to the configuration as described above, the electrical resistance of the conductor wiring can be further reduced.
Moreover, even when one of the plurality of conductor wirings is broken, the continuity of the other conductor wirings is guaranteed.

In another aspect of the present invention, the support member is a core member having a circular, elliptical, or rounded rectangular cross section, and the conductor wiring is wound around the core member.
According to the configuration as described above, the expandable wiring includes the core material and the conductor wiring wound around the core material. In other words, while the conductor wiring alone is too soft to handle, it is easy to handle because the core material supports the conductor wiring at its center position. is easy to manufacture.
In addition, since the cross-sectional shape of the supporting member positioned inside the conductive wiring is circular, elliptical, or rectangular with rounded corners, the contact surface between the conductive wiring and the supporting member can be widened. Therefore, the conductor wiring can be effectively supported by the supporting material.

In another aspect of the present invention, the substrate includes a first supporting portion and a second supporting portion, and the first and second supporting portions are joined to face each other with the expandable wiring interposed therebetween. .
According to the configuration as described above, it is possible to appropriately realize the electronic component as described above.

In another aspect of the present invention, there is provided a display device comprising the electronic component as described above and a display element, wherein the display element is embedded in the substrate, and the expandable wiring is connected to the display element. .
According to the configuration as described above, for example, a wearable display device can be appropriately realized.

In another aspect of the invention, the display element is a light emitting element.
According to the configuration as described above, it is possible to appropriately realize the display device as described above.

ADVANTAGE OF THE INVENTION According to the present invention, it is possible to provide an electronic component and a display device equipped with expandable wires that can reduce the possibility of cracks by reducing the strain between the conductor wires and the supporting material that supports them. can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a schematic plan view and FIG. 4B is a schematic cross-sectional view of a display device using elastic wiring and an electronic component according to a first embodiment of the present invention; (a) is a side view of the expandable wire when not stretched, and (b) is a side view of the expandable wire when it is stretched. FIG. 10 is an explanatory diagram relating to setting of the pitch major axis ratio of the expandable wiring. It is explanatory drawing of the manufacturing method of conductor wiring of the said expansion-contraction wiring. It is explanatory drawing of the manufacturing method of conductor wiring of the said expansion-contraction wiring. It is explanatory drawing of the manufacturing method of conductor wiring of the said expansion-contraction wiring. It is a side view of the expansion-and-contraction wiring in the 1st modification of the said 1st Embodiment. FIG. 11 is a schematic cross-sectional view of a display device using elastic wires and electronic components in a second modification of the first embodiment; FIG. 10 is an explanatory diagram of an expandable wiring, an electronic component, and a display device according to a second embodiment of the present invention; It is explanatory drawing of the expansion-and-contraction wiring in the modification of the said 2nd Embodiment, an electronic component, and a display apparatus.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The electronic component in this embodiment includes a support member made of an insulating material having elasticity, and a conductor wiring spirally wound around an axis extending in one direction and at least the inner side supported by the support member. and an elastic substrate in which the elastic wiring is embedded.

[First embodiment]
FIG. 1A is a schematic plan view of a display device using elastic wiring and electronic components according to the first embodiment. FIG. 1(b) is a cross-sectional view of the AA portion of FIG. 1(a).
A display device 1 includes an electronic component 2 and a display element 6 . The electronic component 2 includes a substrate 3 and an expandable wiring 10. - 特許庁

The substrate 3 includes a first supporting portion 4 and a second supporting portion 5 formed in a flat plate shape. Each of the first support portion 4 and the second support portion 5 is formed of an insulating material having elasticity, such as an elastomer. More specifically, thermosetting polyurethane, thermoplastic polyurethane, silicone, polyvinyl chloride, natural rubber, and various synthetic rubbers such as ethylene propylene rubber are applicable. More preferably, it is at least partially transparent to visible light, and thermosetting polyurethane, thermoplastic polyurethane, silicone, and polyvinyl chloride can be exemplified. The first and second support portions 4 and 5 are joined to face each other with an expandable wire 10 whose structure will be described later in detail sandwiched therebetween. Thereby, the flexible wiring 10 is embedded in the substrate 3 and the flexible wiring 10 is supported by the substrate 3 . In FIG. 1(a), the substrate 3 is seen through, and each component such as the expandable wiring 10 embedded in the substrate 3 is shown.
In this embodiment, the expandable wiring 10 is provided in a grid pattern.

The display element 6 is embedded in the substrate 3 of the electronic component 2, particularly in the second support portion 5 in this embodiment. The display elements 6 are provided corresponding to each of the grids formed by the elastic wirings 10 and connected to the elastic wirings 10 by solders 7 .
In this embodiment, the display element 6 is a light-emitting element such as an LED, an OLED, or an element using a phosphor that is excited by an electron beam or light. Among the above, for example, an LED is suitable as a light-emitting element, and the light-emitting element is an LED in this embodiment. The LED has one or more light emitting parts in each pixel. Although the size of the LED is not particularly limited, the upper limit of the length of one side of the light emitting surface is 10 mm or less from the viewpoint of definition, and preferably 10 μm or more from the viewpoint of ease of manufacture and output. Also, the LED may or may not be packaged, and may or may not include a reflective material. The display element 6 may realize multicolor by providing a plurality of dies for one light emitting element, or one light emitting element may have one die. As a method for realizing multicolor display elements, a plurality of types of dies may be provided, a single color die may be combined with a plurality of types of phosphors, and a white light emitting element and a color filter may be combined. can be

FIG. 2(a) is a side view of the expandable wire 10 when it is not stretched, and FIG. 2(b) is a side view when it is stretched. The expandable wiring 10 includes a support member 11 and conductor wiring 12 .
The support member 11 is made of a stretchable insulator such as an elastomer. Especially in this embodiment, the support member 11 is made of the same material as the substrate 3 .
The support material 11 is a thread-like core material having a circular cross-sectional shape.

The conductor wiring 12 is spirally wound around an axis C extending in one direction (the horizontal direction in FIG. 2, hereinafter referred to as the axial direction). In the present embodiment, the axis C is the central axis of the support member 11, and the conductor wiring 12 is wound around the support member 11, and the conductor wiring 12 is wound around the support member 11 at least inside the spirally wound portion. Supported. The conductor wiring 12 is wound around the supporting member 11 at regular intervals. More specifically, the conductor wiring 12 is formed such that the length of the spiral of the conductor wiring 12 in the direction of the axis C when going around the supporting member 11, that is, the pitch length P is constant.
The material of the conductor wiring 12 is, for example, any one of copper, gold, silver, aluminum, titanium, molybdenum, tungsten, nickel, iron, and alloys thereof. do not have. The cross-sectional shape of the conductor wiring 12 may be any shape, and specific examples thereof include a circle, an ellipse, a rectangle with rounded corners, and a rectangle-circle.
In this embodiment, the natural length of the expandable wiring 10 is the same as the natural length of the support member 11 .
As already explained, the expandable wires 10 , ie the conductor wires 12 are embedded in the substrate 3 .

Due to the above configuration, the expandable wiring 10 shown in FIG. 2(a) expands as shown in FIG. 2(b) when a tensile force PF acts in the direction of the axis C. When released from the tensile force PF, it contracts to the original shape shown in FIG. 2(a), that is, the state before stretching. In FIG. 2(b), the shape of the support member 11 shown in FIG. 2(a) before stretching is indicated by broken lines.
More specifically, when a tensile force PF is applied, a corresponding stress is generated inside the support 11 . The support member 11 expands and shrinks in cross section in proportion to the stress. In FIG. 2(b), the length of the support member 11 is elongated from L by ΔL to L+ΔL, and the cross-sectional diameter is contracted from W by ΔW to W−ΔW.

As the supporting member 11 deforms, the conductor wiring 12 also deforms. In the direction of the axis C, the conductor wiring 12 is deformed so that the pitch length P is elongated as the support member 11 is elongated. In FIG. 2(b), the pitch length after elongation is indicated as P'.

In order to reduce the strain between the conductive wiring 12 and the supporting member 11 that supports it when the flexible wiring 10 is stretched, and to reduce the possibility of cracks occurring, the conductive wiring 12 in the non-stretched state It is important to appropriately set the pitch length-to-radius ratio P/r, which is the value obtained by dividing the pitch length P by the spiral radius r, in the conductor wiring 12 . Here, the radius r of the spiral is the radius at the central portion of the cross section of the conductor wiring 12 with the axis C as the center.
If the pitch major radius ratio P/r is excessively large, the winding amount of the conductor wiring 12 per unit length of the supporting member 11 is reduced, so that the inner diameter of the conductor wiring 12 when the expandable wiring 10 is stretched is reduced. The amount of shrinkage increases. When the amount of shrinkage of the inner diameter of the conductor wiring 12 exceeds the shrinkage amount ΔW of the cross section of the support member 11 , the conductor wiring 12 exerts a force that tightens the support member 11 , and distortion occurs between the support member 11 and the conductor wiring 12 .

Appropriate setting of the pitch major axis ratio P/r will be described below. Here, it is assumed that the cross-sectional diameter φ of the conductor wiring 12 is sufficiently smaller than the cross-section of the support member 11, and that the inner diameter and the outer diameter of the conductor wiring 12 are the same. That is, the radius of each of the inner and outer diameters of the conductor wiring 12 is approximately equal to the radius r of the spiral, and the radius centered on the axis C in the cross section of the support member 11 is also approximately equal to the radius r of the spiral. and
Further, in general, many elastomers assumed to form the support member 11 have a Poisson's ratio, ie, ΔW/ΔL in FIG. 2, of 0.4 or more and 0.5 or less. Therefore, it is assumed to be 0.5 in this embodiment.

FIG. 3 is an explanatory diagram of a model of the expansion wiring 10 used in setting the pitch major axis ratio P/r. FIG. 3(a) is a perspective view of the stretchable wiring 10 cut out at the pitch length P of the conductor wiring 12 when not stretched. FIG. 3(b) is a perspective view of the expandable wiring 10 shown in FIG. 3(a) in a state in which the length in the direction of the axis C is P'. 3(c) and 3(d) show the outer surface of the expandable wire 10 in each of FIGS. Cut and unfolded.

In FIG. 3, r is the radius of the cross section of the support member 11 when not stretched and the radius of the helix of the conductor wiring 12 . r' is the radius of the cross section of the support member 11 when stretched, and r'' is the radius of the spiral of the conductor wiring 12 when stretched.
D is the circumferential length of the support member 11 when not stretched, and the length of the conductor wiring 12 in the circumferential direction perpendicular to the axis C. As shown in FIG. D′ is the circumferential length of the support member 11 when stretched, and D″ is the length in the circumferential direction perpendicular to the axis C of the conductor wiring 12 when stretched.
These lengths D, D' and D'' are represented by the following equations 1-3.

Q is the length when the conductor wiring 12 of one pitch length P is extended linearly when not extended. Q' is the length when the conductor wiring 12 of one pitch length P' is linearly extended.
These lengths Q and Q' are represented by the following equations 4 and 5.

It is assumed that the lengths Q and Q' do not change and have the same value both when the expandable wire 10 is not stretched and when it is stretched, and the following formula 6 is established.

Here, the elongation rate of the expandable wire 10, that is, the length of the expandable wire 10 when not expanded (L in FIG. 2, P in FIG. 3A) and the length after expansion (L+ΔL in FIG. 2, FIG. 3 ( It is assumed that the ratio of P') in b) is, for example, 1.5 at maximum, and the expandable wire 10 is stretched up to 1.5 times the length.
It is also assumed that the volume of the supporting material 11 does not change before and after expansion and contraction. That is, when the volume of the support member 11 when not stretched is V, and the volume of the support member 11 when stretched is V', the following formulas 7 to 9 are established.

When the conductor wiring 12 wound spirally is stretched, the radius of the spiral becomes smaller. Since it is difficult to shrink the conductor wiring 12 from the stretched state, the pitch major axis ratio P/r in the non-stretched state is less than 5.62 when the maximum stretch rate is set to 1.5 as described above. must be.
Preferably, the upper limit of the pitch major axis ratio P/r in the non-stretched state of the conductor wiring 12 is a value calculated by the following method.
When the amount of deformation is very small, the stress-strain curve can be regarded as symmetrical with respect to the origin, and the smaller the absolute value of the strain, the better. That is, it is preferable that the maximum value and the minimum value of distortion around the origin are the same value. The amount of displacement can be calculated from the following equation based on Equations 1-9 above.

When the maximum elongation rate is 1.5, the pitch major axis ratio P/r is 3.38, and the absolute value of the displacement is 2.3%.
By using the pitch major axis ratio P/r calculated by the above method, the distortion between the conductor wiring 12 and the support 11 can be reduced, and the deterioration of the expansion and contraction performance of the conductor wiring 12 and the deterioration of the conductor wiring 12 It is possible to suppress the possibility of damage.

The lower limit of the pitch major axis ratio P/r is 0.01. However, the contact coil is not included. In the case of the close contact coil, since it has an initial tension, the tensile stress of the electronic component 2 and the display device 1 produced using the expandable wiring 10 as described above becomes discontinuous, which is not preferable. By reducing the pitch major axis ratio P/r, it is possible to reduce the amount of distortion when the conductor wiring 12 expands and contracts. The lower limit of r is preferably 0.1, more preferably 1.
The radius of the conductor wiring 12 may be any radius, but is preferably 20 nm or more, more preferably 200 nm or more, in order to prevent a voltage drop due to electrical resistance.

Next, a method for manufacturing the expandable wiring 10, particularly the conductor wiring 12 will be described. 4A and 4B are explanatory diagrams for explaining one mode (first mode) of the method for manufacturing the conductor wiring 12. FIG.
First, as shown in FIG. 4A, a first photosensitive polymer layer 21 is formed on a flat stretchable substrate 20, and then a gray scale mask 22 is formed. Here, the gray scale mask 22 has a pattern in which a transmissive portion 22a that transmits the exposure light 23 and an opaque portion 22b that does not transmit the exposure light 23 are continuously repeated.
In this state, exposure light 23 is applied to cure the first photosensitive polymer layer 21 in the vicinity of the transmissive portion 22a, and then washed to form a wave-shaped photosensitive polymer layer 24 as shown in FIG. 4(b). be done.
Furthermore, after forming the metal layer 25 and the second photosensitive polymer layer 26 on the corrugated photosensitive polymer layer 24, exposure light 27 is irradiated to expose and developed to obtain the structure shown in FIG. 4(c). As shown, a spiral conductor trace 12 is formed.

FIG. 5 is a perspective view of the corrugated photosensitive polymer layer 24 and the metal layer 25 in the step shown in FIG. 4(c). 6(a) is a plan view in the XY directions in the three directions X, Y, and Z shown in FIG. 5, and FIG. 6(b) is a side view in the YZ directions. In each figure, 24a indicates the top of the corrugated photopolymer layer 24 and 24b indicates the recesses of the corrugated photopolymer layer 24. FIG.
In the formation of the conductor wiring 12 in FIG. 4(c), as shown in FIGS. 5 and 6, exposure is performed with exposure light 27 whose wavelengths in the XY direction and the YZ direction are shifted by 1/4 wavelength. Thus, a spiral conductor wiring 12 is formed.
The photosensitive material used may be either positive type or negative type, or a combination thereof.

A second embodiment of the method for manufacturing the conductor wiring 12 of the expandable wiring 10 is to fabricate the corrugated photosensitive polymer layer of the first embodiment by various printing methods. Examples include various intaglio printing methods and letterpress printing methods including a dispensing method, a screen method, an inkjet method, and a nanoimprint method. The material may be molded by a curing method other than photocuring, and examples of curing methods include photocuring, heat curing, moisture curing, and the like. That is, it may be a polymer other than a photosensitive polymer.
A third form of the method for manufacturing the conductor wiring 12 of the expandable wiring 10 is manufactured by winding a metal wire around a columnar or cylindrical core material.
A fourth form of the method for manufacturing the conductor wiring 12 of the expandable wiring 10 exposes the exposing light 27 by scanning irradiation of laser light. Laser beam scanning methods include, for example, galvanometer mirrors and various motors.
In a fifth embodiment of the method for manufacturing the conductor wiring 12 of the expandable wiring 10, after vapor-depositing a metal layer on the outer periphery of a cylindrical or cylindrical core material, a photosensitive polymer is further applied to the outer periphery of the metal layer, and the entire is exposed while rotating about the longitudinal direction.
The expandable wiring 10 may have an insulating coating. The manufacturing method is not particularly limited, but a method similar to the manufacturing method of enamel wiring can be used. For example, there is a method of repeatedly applying and curing the insulating coating material, and a method of covering by flowing the expandable wire and the insulating coating material through a cone at the same time.

Next, effects of the electronic component 2 and the display device 1 having the expandable wiring 10 will be described.

The electronic component 2 in this embodiment is spirally wound around a supporting member 11 made of a stretchable insulating material and an axis C extending in one direction, and at least the inner side is supported by the supporting member 11. and a stretchable wiring 10 having a conductive wiring 12 and an elastic substrate 3 in which the stretchable wiring 10 is embedded.
According to the configuration described above, the expandable wiring 10 includes the supporting member 11 made of an insulating material having elasticity and the conductor wiring 12 wound in a spiral shape, so that it can be stretched in the direction of the axis C. It stretches easily when a force PF is applied and contracts back to its original shape when released from a tensile force PF. Since the conductor wiring 12 is spirally wound, the breaking elongation is greater than that of a structure in which the wiring is expanded and contracted within a two-dimensional plane, and the conformability to a three-dimensional curved surface is also excellent.
The expandable wiring 10 as described above is embedded in the substrate 3 having elasticity to form the electronic component 2 . can be realized, the stress generated between the conductor wiring 12 and the surrounding substance during expansion and contraction is widely distributed while the entire electronic component 2 has good elasticity, and the possibility of cracks is reduced. can do.

Also, the substrate 3 is made of the same material as the support member 11 .
According to the configuration as described above, the expandable wiring 10 can be realized so that the surroundings of the conductive wiring 12 are in contact with the substrate 3 and the supporting member 11, which are of the same material. Therefore, even when the support member 11 and the substrate 3 are elongated and contracted to the original shape after the expansion, the concentration of stress on the contact interface between different materials, which may occur when different materials are used, is suppressed. . That is, stress concentration on a specific portion of the supporting member 11 or the substrate 3 is suppressed, so that peeling at the interface between the supporting member 11 or the substrate 3 and the conductor wiring 12 or breakage of the conductor wiring 12 can be reduced. be.

Also, the material of the conductor wiring 12 is any one of copper, gold, silver, aluminum, titanium, molybdenum, tungsten, nickel, iron, and alloys thereof.
Moreover, the support material 11 is an elastomer.
According to the configuration as described above, the expandable wiring 10 can be realized appropriately.

The support member 11 is a core member having a circular cross section, and the conductor wiring 12 is wound around the core member 11 .
According to the configuration as described above, the expandable wiring 10 includes the core material 11 and the conductor wiring 12 wound therearound. That is, when the conductor wiring 12 alone is too soft, it is difficult to handle. Manufacture of the part 2 and the device 1 is facilitated.
In addition, since the cross-sectional shape of the support member 11 located inside the conductor wiring 12 is circular, the contact surface between the conductor wiring 12 and the support member 11 can be widened. Therefore, the conductor wiring 12 can be effectively supported by the supporting member 11 .

Further, the substrate 3 includes a first support portion 4 and a second support portion 5, and the first and second support portions 4 and 5 are joined to face each other with the expansion/contraction wiring 10 interposed therebetween.
According to the configuration as described above, the electronic component 2 as described above can be appropriately realized.

The display device 1 according to the present embodiment includes the electronic component 2 and the display element 6 as described above.
Moreover, the display element 6 is a light emitting element.
According to the configuration as described above, the wearable display device 1 can be appropriately realized.

[First Modification of First Embodiment]
Next, a first modification of the expandable wiring 10 shown as the first embodiment will be described with reference to FIG. FIG. 7 is a side view of the expandable wiring in this modified example. The expandable wiring 30 in this modification includes a plurality of conductor wirings 12 having the same pitch length-to-radius ratio P/r as the expandable wiring 10 shown as the first embodiment, and the plurality of conductor wirings 12 are arranged in one direction, that is, the axis C It is different in that it is provided in a multiple spiral structure with an interval G in the extending direction.
In particular, in this modified example, the expandable wire 30 has two conductor wires 12A and 12B, and these conductor wires 12A and 12B form a double spiral structure.

It goes without saying that this modified example has other effects similar to those of the already described first embodiment.
In particular, according to the configuration as described above, the electrical resistance of the conductor wiring 12 can be further reduced.
Further, even when one of the plurality of conductor wirings 12A, 12B is broken, continuity is ensured by the other conductor wirings 12A, 12B.

[Second Modification of First Embodiment]
Next, a second modification of the display device 1 shown as the first embodiment will be described with reference to FIG. FIG. 8 is a schematic cross-sectional view of a display device in this modified example. The display device 40 in this modified example differs from the display device 1 shown as the first embodiment in that the substrate 43 does not include the first support portion 4 and the second support portion 5 as in the first embodiment, and is a single unit. The difference is that each component forming the display device 40 is embedded inside the substrate 43 formed as a single unit.

The electronic component 42 of this modified example includes an expandable wire 10 and a substrate 43 in which the expandable wire 10 is embedded, as in the first embodiment. formed by Since the substrate 43 and the support member 11 are made of the same material, discontinuity in the amount of internal strain when stress is applied is less likely to occur, thereby suppressing the occurrence of damage and permanent deformation due to long elongation and repeated deformation. It is possible and more preferable.
The display device 40 of this modified example includes the electronic component 42 and the display element 6 as described above.

It goes without saying that this modified example has other effects similar to those of the already described first embodiment.

[Second embodiment]
Next, a second embodiment will be described. FIG. 9 is an explanatory diagram of the electronic component 52 and the expandable wiring 60 in the second embodiment.
In the expandable wiring 60 according to the second embodiment, the conductor wiring 12 described in the first embodiment is embedded in the substrate 53 . The substrate 53 has a first support portion 54 and a second support portion 55 , and the first and second support portions 54 and 55 are joined to face each other with the conductor wiring 12 interposed therebetween.
Thus, particularly in this embodiment, the inside of the spiral of the conductor wiring 12 is filled with the material forming the substrate 53 . Here, for example, in FIG. 9, as in FIG. 3A, a cylindrical body 53C along which the helical shape of the conductor wiring 12 is wound inside the conductor wiring 12 can be assumed. The cylindrical body 53C corresponds to the core material having a circular cross section, that is, the support material 11 in FIG. 3(a). Thus, at least the inside of the spiral of the conductor wiring 12 is contacted and supported by the substrate (supporting material) 53 .

The display device 50 includes the electronic component 52 as described above and a display element such as an LED (not shown).

Next, effects of the electronic component 52 and the display device 50 having the expandable wiring 60 will be described.

The electronic component 52 in this embodiment is spirally wound around a support member 53C made of a stretchable insulating material and an axis extending in one direction, and at least the inside is supported by the support member 53C. An expandable wiring 60 having a conductor wiring 12 and an elastic substrate 53 in which the expandable wiring 60 is embedded are provided.
According to the configuration as described above, the expandable wiring 60 includes the support member 53C formed of an insulating material having elasticity and the conductor wiring 12 wound in a spiral shape, so that a tensile force is exerted in the axial direction. It elongates easily when a force is applied and contracts back to its original shape when the tensile force is released. Since the conductor wiring 60 is spirally wound, the breaking elongation is greater than that of a structure in which the wiring is expanded and contracted in a two-dimensional plane, and the conformability to a three-dimensional curved surface is also excellent.
The expandable wiring 60 as described above is embedded in the substrate 53 having elasticity to form the electronic component 52. The electronic component 52 is arranged so that the periphery of the conductor wiring 12 is in wide contact with the substrate 53 and the support member 53C. Therefore, the stress generated between the conductor wiring 12 and the surrounding substance during expansion and contraction is widely distributed while the entire electronic component 52 has good elasticity, and the possibility of cracks is reduced. can do.

Also, the substrate 53 is made of the same material as the support member 53C.
According to the configuration as described above, it is possible to realize the expandable wiring 60 so that the periphery of the conductor wiring 12 is in contact with the substrate 53 and the supporting member 53C. Therefore, even when the support member 53C and the substrate 53 are elongated and contracted to the original shape after the expansion, the concentration of stress on the contact interface of different materials, which may occur when different materials are used, is suppressed. . That is, stress concentration on a specific portion of the support member 53C and the substrate 53 is suppressed, so that peeling at the interface between the support member 53C and the substrate 53 and the conductor wiring 12 and breakage of the conductor wiring 12 can be reduced. be.

Also, the material of the conductor wiring 12 is any one of copper, gold, silver, aluminum, titanium, molybdenum, tungsten, nickel, iron, and alloys thereof.
Also, the support member 53C is an elastomer.
According to the configuration as described above, the expandable wiring 60 can be appropriately realized.

Also, the substrate 53 has a first support portion 54 and a second support portion 55 , and the first and second support portions 54 and 55 are joined to face each other with the expandable wiring 60 interposed therebetween.
According to the configuration as described above, the electronic component 52 as described above can be appropriately realized.

Further, the display device 50 in this embodiment includes the electronic component 52 and the display element as described above, the display element is embedded in the substrate 53, and the expandable wiring 60 is connected to the display element.
Also, the display element is a light-emitting element.
According to the configuration as described above, the wearable display device 50 can be appropriately realized.

[Modification of Second Embodiment]
Next, a modification of the display device 50 and the electronic component 52 shown as the second embodiment will be described with reference to FIG. FIG. 10 is an explanatory diagram of the display device 70, the electronic component 72, and the expansion/contraction wiring 80 in this modified example. The display device 70 according to this modified example differs from the display device 50 shown as the second embodiment in that the substrate 73 does not include the first support portion 54 and the second support portion 55 as in the second embodiment, and is a single unit. The difference is that each component forming the display device 70 is embedded inside the substrate 73 formed as a single unit.
In this modification, as in FIG. 3A, a cylindrical body 73C along which the helical shape of the conductor wiring 12 is wound along the inside of the conductor wiring 12 can be assumed. This cylindrical body 73C corresponds to the core material having a circular cross section, that is, the support material 11 in FIG. 3(a).

It goes without saying that this modified example has other effects similar to those of the already described second embodiment.

It should be noted that the electronic component and the display device provided with expandable wires of the present invention are not limited to the above-described embodiments and modifications described with reference to the drawings, and various other modifications can be made within the technical scope thereof. Modifications are possible.

For example, in the conductor wiring 12 using a core material having a circular cross-section as the supporting material 11, as shown in the first embodiment, linear wiring is arranged around a core material having a shape similar to that of the supporting material 11. It may be formed by winding and deforming.
Further, in the first modification of the first embodiment, the double helix structure is formed by two conductor wirings 12, but the number of conductor wirings 12 forming the multiple helix structure may be three or more. good.

Further, for example, in the first embodiment, the support member 11 has a circular cross-sectional shape, but instead of this, the cross-sectional shape may be elliptical or rectangular with rounded corners.
Further, for example, in the first embodiment, the natural length of the expandable wiring 10 is the same as the natural length of the support member 11, but the present invention is not limited to this. That is, the natural length of the expandable wiring does not have to be the same as the natural length of the support member. For example, by placing the flexible wiring in a state where it is compressed from its natural length and placed on a support having a natural length, the natural length of the flexible wiring can be placed at a point where the length of the support is longer than the natural length. A similar configuration can also be achieved by installing the support member in a stretched state while maintaining the stretchable wire at its natural length. With such a configuration, the absolute value of the maximum strain amount can be reduced, and the support member can be stretched to a greater extent.

In addition to this, it is possible to select the configurations mentioned in each of the above-described embodiments and modifications, or to change them to other configurations as appropriate without departing from the gist of the present invention.
For example, the expandable wiring 60 shown as the second embodiment may have a multiple spiral structure as shown as the first modified example of the first embodiment.

1, 40, 50, 70 display devices 2, 42, 52, 72 electronic components 3, 43, 53, 73 substrates 4, 54 first supports 5, 55 second supports 6 display elements 10, 30, 60, 80 Expandable wiring 11, 53C, 73C Supporting members 12, 12A, 12B Conductor wiring C Axis line

Claims (9)

a support made of a stretchable insulator;
a conductor wiring spirally wound around an axis extending in one direction and having at least an inner side supported by the support member;
a telescopic wire comprising a
a stretchable substrate in which the stretchable wiring is embedded;
The electronic component , wherein the substrate is made of the same material as the support member . 2. The electronic component according to claim 1 , wherein the material of said conductor wiring is any one of copper, gold, silver, aluminum, titanium, molybdenum, tungsten, nickel, iron, and alloys thereof. 3. The electronic component according to claim 1, wherein said support material is an elastomer. 4. The electronic component according to any one of claims 1 to 3 , wherein the expandable wiring includes a plurality of the conductor wirings, and the plurality of the conductor wirings are provided in a multiple spiral structure spaced apart in the one direction. . 5. The support material according to any one of claims 1 to 4 , wherein the support material is a core material having a circular, elliptical, or rounded rectangular cross section, and the conductor wiring is wound around the core material. Electronic parts described in the item. The substrate comprises a first support and a second support,
The electronic component according to any one of claims 1 to 5 , wherein the first and second support portions are joined to face each other with the expandable wiring interposed therebetween. The electronic component according to any one of claims 1 to 6, wherein the pitch major axis ratio P/r is determined by the following equation.

(r is the cross-sectional radius of the support material when not stretched, r' is the cross-sectional radius of the support material when stretched, r'' is the spiral radius of the conductor wiring when stretched, and P is the axial direction when not stretched. The pitch length of the conductor wiring that rotates once, P' is the pitch length of the conductor wiring that rotates once in the axial direction when stretched) an electronic component according to any one of claims 1 to 7 ;
having a display element,
The display element is embedded in the substrate,
A display device, wherein the expandable wiring is connected to the display element. 9. The display device according to claim 8, wherein said display element is a light emitting element.

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