KR20210018011A - Stretchable substrate and Stretchable display device - Google Patents

Abstract

The object of the present invention is to provide a stretchable substrate and a stretchable display device capable of reducing local distortion concentration and display distortion on an electronic circuit in a stretched state. Provided is the stretchable substrate on which the electronic circuit is installed and formed of a stretchable material, the stretchable substrate having an octet structure.

Description

Stretchable substrate and stretchable display device

The present invention relates to a stretchable substrate and a stretchable display device.

In recent years, wearable terminals are spreading. Wearable terminals are used for various purposes and purposes, such as managing health by measuring sleep, number of steps, and amount of exercise, or notifying an incoming call in connection with a smartphone or the like.

As a wearable terminal, especially in the case of directly attaching to the body by a method such as directly attaching to the skin, there are cases where elastic performance is required in order to move along with the movement of the body. Therefore, elasticity is also required in the substrate and wiring for realizing a wearable terminal.

Patent Document 1 discloses a substrate having such stretchability.

The stretchable substrate having such stretchability is usually formed of an insulator having stretchability such as an elastomer.

Patent Document 1: Japanese Patent Laid-Open Publication No. 2016-219782

Materials for forming a stretchable substrate such as an elastomer as described above have a Poisson ratio, for example, close to 0.5, and a volume change accompanying stretching is very small. When a substrate formed of such a material is elongated in the longitudinal direction, for example, the width and thickness of the substrate are reduced. The degree of reduction of the width and thickness is particularly large in the vicinity of the center than the end portion, and therefore, the stretchable substrate is greatly deformed so that the distortion is concentrated in the vicinity of the center.

Therefore, in the electronic circuit provided in the stretchable board, the load at the time of stretching is concentrated especially in the part provided near the center.

In addition, in the conventional stretchable substrate, as described above, when the substrate is stretched in the longitudinal direction, the width is reduced, so that the in-plane dimensional ratio when stretched changes. As described above, since the degree of reduction in the width at the time of stretching increases in the vicinity of the center, the change in the in-plane dimensional ratio becomes particularly remarkable in the vicinity of the center rather than near the end.

Therefore, for example, even if a display device having elasticity is realized by arranging a plurality of display elements such as LEDs in a grid in a stretchable substrate, when the stretchable substrate is stretched, the image displayed in the vicinity of the center in the stretched direction becomes large. Is distorted.

An object of the present invention is to provide a stretchable substrate and a stretchable display device capable of reducing local distortion concentration and display distortion of an electronic circuit in a stretched state.

The present invention employs the following means in order to solve the above problems. That is, the present invention provides a stretchable substrate provided with an electronic circuit and formed of a material having stretchability, and provided with an auxetic structure.

In the present specification, the increase in length is not only when the total length of the object in one direction increases, but also in the range where the length in the one direction is shorter than the total length does not exceed the total length. Includes cases. In addition, the Poisson's ratio having a negative value is not only when the object is elongated in one direction, the entire length of the object in a direction orthogonal to one direction is elongated, but also the length in the orthogonal direction. This includes cases where the part shorter than the total length of is elongated within the range not exceeding the total length.

The augitive structure is a structure that is elongated in a direction in which an elongation force is applied, and also in at least one direction perpendicular thereto.

Since such an augitive structure is installed on the stretchable substrate, even if the stretchable substrate attempts to contract in a direction orthogonal to the stretching force, the contraction cannot resist the stretching in the orthogonal direction of the augitive structure. . As a result, the stretchable substrate is also elongated in the direction in which the elongation force is applied, and also in a direction orthogonal to the elongation due to the elongation of the augitive structure, or is deformed so that the contraction in the orthogonal direction is alleviated even if it is not elongated.

As described above, when the stretching force is applied, the stretchable substrate receives the stretching force in each of the direction in which the stretching force is applied and a direction orthogonal thereto, so that a large reduction in local length in the orthogonal direction can be suppressed. Accordingly, local large deformation of the stretchable substrate can be suppressed, and local distortion concentration on the electronic circuit can be suppressed.

Further, the present invention provides a stretchable display device having a stretchability, comprising a stretchable substrate formed of a stretchable material in which a plurality of display elements are installed, wherein the stretchable substrate includes an augitive structure. do.

According to the above configuration, since the augitive structure is installed on the stretchable substrate, even if the stretchable substrate attempts to shrink in a direction orthogonal to it when the stretching force is applied, this shrinkage occurs in the direction orthogonal to the augitive structure. Can not resist As a result, the stretchable substrate is also elongated in the direction in which the elongation force is applied, and also in a direction orthogonal to the elongation due to the elongation of the augitive structure, or is deformed so that the contraction in the orthogonal direction is alleviated even if it is not elongated.

As described above, when the stretching force is applied, the stretchable substrate receives the stretching force in each of the direction in which the stretching force is applied and a direction orthogonal thereto, so that a large reduction in local length in the orthogonal direction can be suppressed. Accordingly, local large deformation of the stretchable substrate can be suppressed, and local distortion concentration on the electronic circuit can be suppressed.

In addition, as described above, since the stretchable substrate is stretched in both directions orthogonal to the direction in which the stretching force is applied, it is possible to reduce a change in the in-plane dimension ratio on the stretchable substrate during stretching. Accordingly, it is possible to reduce distortion of an image displayed when an image is displayed on the stretch display device.

In one aspect of the present invention, the augmented structure is formed of a material having a higher elasticity than the material, and a plurality of unit structures configured so that the Poisson's ratio becomes a negative value when viewed in plan are formed side by side.

According to the above configuration, the unit structure is configured such that the Poisson's ratio becomes a negative value when viewed in a plan view. That is, the unit structure is formed so that when the elongation force acts in the plane and the length in the direction in which the elongation force is applied increases, the length in the direction perpendicular to the direction in which the elongation force is applied is also increased. have. Since such a unit structure is arranged to form an augetic structure, when a stretching force is applied to the augetic structure, the augitive structure is elongated in the direction in which the elongation force is applied, and at the same time in a direction perpendicular thereto.

Since such an augitive structure is formed of a material having higher elasticity than the material forming the stretchable substrate, even if the stretchable substrate tries to shrink in a direction orthogonal to it when the stretching force is applied, this shrinkage is orthogonal to the augitive structure. It cannot resist elongation in the direction. As a result, the stretchable substrate is also elongated in the direction in which the elongation force is applied, and also in a direction orthogonal to the elongation due to the elongation of the augitive structure, or is deformed so that the contraction in the orthogonal direction is alleviated even if it is not elongated.

As described above, when the stretching force is applied, the stretchable substrate receives the stretching force in the direction in which the stretching force is applied and in a direction orthogonal thereto, so that a large reduction in local length in the orthogonal direction can be suppressed. Accordingly, local large deformation of the stretchable substrate can be suppressed, and local distortion concentration on the electronic circuit can be suppressed.

In another aspect of the present invention, the value of the Poisson's ratio of the unit structure positioned in the inward direction is smaller than the value of the Poisson's ratio of the unit structure positioned around the periphery of the augitive structure.

According to the above configuration, when the stretching force is applied to the stretchable substrate, in the inner direction portion where the length change in the direction perpendicular to the direction in which the stretching force is applied is large, the value of the Poisson ratio is small, that is, when the stretching force is applied. A unit structure having a large degree of elongation in an orthogonal direction is provided. In this way, when the stretchable substrate is stretched, it is possible to effectively resist shrinkage deformation, particularly in the inner portion.

Therefore, it is possible to effectively realize a stretchable substrate and a stretchable display device capable of reducing local distortion concentration and display distortion of the electronic circuit in the stretched state.

In another aspect of the present invention, the unit structure is provided more in the inner direction side than the peripheral circumferential portion of the augitive structure.

According to the above configuration, when the stretching force is applied to the stretchable substrate, a unit structure configured to be elongated in a direction orthogonal to the inner direction portion having a large change in length in a direction orthogonal to the direction in which the stretching force is applied is provided. It is installed more than the wealth. In this way, when the stretchable substrate is stretched, it is possible to effectively resist shrinkage deformation, particularly in the inner portion.

Therefore, it is possible to effectively realize a stretchable substrate and a stretchable display device capable of reducing local distortion concentration and display distortion of the electronic circuit in the stretched state.

In another aspect of the present invention, the unit structure has a virtual rectangle extending in a first direction and a second direction orthogonal to the first direction as an outer contour when viewed in plan view, and the first First and second support plates erected and installed along each of the first virtual sides extending in a direction, and first and second deformation plates installed corresponding to the second virtual sides extending in the second direction, and the second Each of the first and second deformation plates is connected to a center point located inside the virtual rectangle than the center of the second virtual side and each vertex of the virtual rectangle to which the second virtual side is connected, to the second virtual side. It is provided with the 1st and 2nd swash plates which are erected and installed along each of the virtual lines which are inclined with respect.

According to the above configuration, when the stretching force acts on the unit structure in the second direction, the first and second support plates are further separated in the second direction, and between the first and second swash plates and the second virtual side The angle is reduced, the angle between the first and second swash plates is increased, and the center point approaches the second virtual side. As a result, the center points corresponding to each of the two second virtual sides are separated, and the length of the unit structure, particularly in the vicinity of the central portion in the second direction, increases in the first direction.

In addition, when an elongation force acts on the unit structure in the first direction, the center point approaches the second virtual side, the angle between the first and second swash plates increases, and the first and second swash plates and the second virtual side increase. The angle between them is reduced, so that the first and second support plates are further separated in the second direction. This increases the length of the unit structure in the second direction.

In this way, the unit structure is configured such that the length in the direction orthogonal to the stretching direction increases even when the stretching force acts in any of the first and second directions.

Accordingly, it is possible to effectively realize a stretchable substrate and a stretchable display device capable of reducing local distortion concentration and display distortion on the electronic circuit in the stretched state.

In another aspect of the present invention, the plurality of unit structures are installed side by side in the second direction to form a row of unit structures, and the second support plate of the unit structure is located on the side of the second support plate of the unit structure, and It is the first support plate in the adjacent unit structure.

According to the above configuration, unit structures can be closely arranged side by side.

Accordingly, it is possible to effectively realize a stretchable substrate and a stretchable display device capable of reducing local distortion concentration and display distortion on the electronic circuit in the stretched state.

In another aspect of the present invention, a plurality of rows of the unit structures are installed side by side in the first direction, and the first and second swash plates of the unit structures constituting the row of unit structures are arranged in the first direction. It is the first or second modified plate of the unit structure constituting the adjacent unit structure row and the unit structure adjacent thereto.

According to the above configuration, unit structures can be closely arranged side by side.

Accordingly, it is possible to effectively realize a stretchable substrate and a stretchable display device capable of reducing local distortion concentration and display distortion on the electronic circuit in the stretched state.

In another aspect of the present invention, when an elongation force acts on the unit structure in the second direction, the first and second support plates are further separated in the second direction, and the first and second swash plates are separated from each other. The angle between the second virtual sides is reduced, the angle between the first and second inclined plates is increased, and the center point approaches the second virtual side.

According to the above configuration, since the unit structure is configured such that the vicinity of the central portion in the second direction in particular extends in the first direction orthogonal to the second direction, even when the stretching force acts in the second direction. It is possible to effectively realize a stretchable substrate and a stretchable display device capable of reducing local distortion concentration and display distortion on an electronic circuit in the stretched state.

In another aspect of the present invention, when an elongation force acts on the unit structure in the first direction, the center point approaches the second virtual side, and the angle between the first and second swash plates increases. , The angle between the first and second swash plates and the second virtual side is reduced, so that the first and second support plates are further separated in the second direction.

According to the above configuration, since the unit structure is configured to be elongated in a second direction orthogonal to the unit structure even when the elongation force is applied in the first direction, the local distortion concentration on the electronic circuit and the It is possible to effectively realize a stretchable substrate and a stretchable display device capable of reducing display distortion.

In a stretchable display device according to another aspect of the present invention, the display element is provided to correspond to one or both of the vertex and the central point of the virtual rectangle.

When a stretching force acts on the stretchable display device, the stretching force acts on each unit structure of the augmentative structure. Each support plate and swash plate of the unit structure are composed of a plate body, and when elongated, the surfaces of these plate bodies are stretched and contracted in a direction perpendicular to the direction in which the stretching force is applied of the material that forms the elastic substrate, such as an elastomer located adjacent to it. Resist the force you are trying to do. Therefore, stress acts on these plate bodies during elongation, and distortion is liable to occur.

On the other hand, at the vertices and center points of the virtual rectangle corresponding to the portions where each plate body of the unit structure is bonded to each other, since a plurality of plate bodies are joined and supported from each other from different directions in the plane, it is easy to resist stress. Compared to the surface portion, distortion is less likely to occur. That is, according to the above configuration, since the display element is installed to correspond to a portion where distortion of the augmentative structure is unlikely to occur, a load applied to the display element when the stretchable display device is elongated can be reduced.

In the stretchable display device of another aspect of the present invention, the display element is provided in correspondence with the first and second support plates of the first unit structure row.

When the stretching force acts on the stretchable substrate, the Poisson's ratio of the augitive structure is configured to have a negative value. Therefore, the stretchable substrate is stretched in both the stretching direction and a direction orthogonal thereto in a plane. Since the stretchable substrate is made of a material having a positive Poisson's ratio, such as an elastomer, if the stretchable substrate is simultaneously stretched in two orthogonal directions in this plane, the thickness of the stretchable substrate is to maintain the volume of the stretchable substrate. Is reduced.

Here, in each unit structure, since the material for forming the stretchable substrate installed around the unit structure is supported by a support plate, it is difficult to be affected by the elongation of the stretchable substrate, and distortion occurring in the thickness direction is difficult to occur. That is, according to the above configuration, since the display element is installed in correspondence with a portion where distortion of the material forming the stretchable substrate is difficult to occur, it is possible to reduce the load applied to the display element when the stretchable display device is stretched. Do.

In a stretchable display device according to another aspect of the present invention, the augitive structure is provided on the stretchable substrate.

According to the above configuration, a stretchable display device can be advantageously realized.

In the stretchable display device of another aspect of the present invention, the stretchable substrate includes a stretchable substrate main body on which the display element is installed, and a support substrate, and the augitive structure is provided on the support substrate, and the support substrate And a surface of the stretchable substrate main body opposite to the display side, where the display by the display element is visible.

According to the above configuration, a stretchable display device can be advantageously realized.

Particularly, since the augitive structure is bonded to the surface opposite to the display side, the aggetic structure does not hinder display by the display element.

In a stretchable display device according to another aspect of the present invention, the stretchable substrate includes a stretchable substrate main body in which the display element is installed, and a support substrate, and the agetic structure is installed on the support substrate, and the agetic structure And one or both of the support substrates are formed of a transparent material, and the support substrate is bonded to a display side surface of the stretchable substrate main body in which display by the display element is visible.

According to the above configuration, a stretchable display device can be advantageously realized.

Although the augitive structure and the support substrate are bonded to the display side, since either or both of the augitive structure and the support substrate are formed of a transparent material, display by the display element is hardly inhibited.

Advantageous Effects of Invention According to the present invention, it is possible to provide a stretchable substrate and a stretchable display device capable of reducing local distortion concentration and display distortion of an electronic circuit in a stretched state.

1 is a plan view of a stretchable substrate and a stretchable display device in an embodiment of the present invention.
FIG. 2 is a side view of the stretchable substrate and the stretchable display device as viewed from the Y direction in FIG. 1.
3 is an explanatory diagram showing a circuit configuration of the stretchable display device of the active matrix system.
4 is a (a) plan view of a display element constituting the stretchable display device of the passive matrix system, (b) is a side view as seen from the Y direction in the drawing, and (c) is a side view as seen from the X direction in the drawing. to be.
Fig. 5 is a schematic side view showing a configuration of a display element constituting the active matrix type stretch display device.
6 is a cross-sectional view of a portion AA of FIG. 2.
FIG. 7 is an enlarged view of a cross-sectional view of part B of FIG. 6.
Fig. 8 is a perspective view of a section B of Fig. 6.
9 is an explanatory diagram illustrating a change in shape of a unit structure of an augitive structure constituting the stretchable substrate and the stretchable display device upon extension.
10 is a plan view of a stretchable substrate and a stretchable display device according to Modification Example 1 of the embodiment.
FIG. 11 is a side view of the stretchable substrate and the stretchable display device of the first modified example as viewed from the Y direction in FIG. 10.
12 is a plan view of a stretchable substrate and an augitive structure of a stretchable display device according to Modification Example 2 of the above embodiment.
13 is a side view of a stretchable substrate and a stretchable display device according to another modified example of the above embodiment.
14 is an explanatory diagram of a unit structure of a stretchable substrate and a stretchable display device according to another modified example of the above embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a schematic plan view of a stretchable substrate and a stretchable display device in an embodiment of the present invention, and FIG. 2 is a side view of a stretchable substrate and a stretchable display device as viewed from the Y direction in FIG. 1.

The stretchable display device 1 (or stretchable display device) includes a stretchable substrate 2 (or stretchable substrate) formed of a material having stretchability, and the stretchable substrate 2 includes an electronic circuit 3 As an installation, in particular, in this embodiment, it is embedded and implemented. Accordingly, the stretchable display device 1 is formed to have stretchability. The stretchable substrate 2 is formed in a flat and rectangular shape so as to fit in a plane formed by the first direction Y and the second direction X orthogonal thereto. The stretchable substrate 2 is made of an insulator having stretchability such as an elastomer. More specifically, various synthetic rubbers such as thermosetting polyurethane, thermoplastic polyurethane, silicone, polyvinyl chloride, natural rubber and ethylene propylene rubber can be applied. In addition, it is more preferable to be at least partially transparent to visible light, and examples thereof include thermosetting polyurethane, thermoplastic polyurethane, silicone and polyvinyl chloride. Further, as a resin for forming the stretchable substrate 2, for example, polyimide, polyamide, polyamideimide, polysulfone, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, etc. can be used, but the present invention is not limited thereto.

The stretch display device 1 includes a display element 4 and a wiring 5. The display element 4 and the wiring 5 are embedded in the stretchable substrate 2.

The display element 4 includes light-emitting elements such as LEDs, OLEDs, elements using phosphors excited by electron beams and light, transmission type light control elements using liquid crystal elements and MEMS shutters, and various reflections used in, for example, electronic paper. Any of the fluorescent control elements or a combination thereof. Among the above, for example, an LED is suitable as a light-emitting element, and in this embodiment, the light-emitting element is an LED. The LED has one or more light emitting portions in each pixel. The dimensions of the LED are not particularly limited, but the upper limit of the length of one side of the light emitting surface is 10 mm or less from the viewpoint of image quality, and is preferably 10 μm or more from the viewpoint of ease of manufacture and output. Further, the LED may or may not be packaged, and may or may not have a reflective material. The display element 4 may realize multicolorization by providing a plurality of dies for one light-emitting element, and one die per light-emitting element may be used. As a method of realizing multicolorization of a display element, a plurality of types of dies may be provided, a single color die may be combined with a plurality of types of phosphors, or a white light emitting element and a color filter may be combined.

The display elements 4 are arranged at a substantially equal pitch in each direction along each of the second direction (X) and the first direction (Y) at intervals from each other.

The display element 4 includes, for example, three first sub-pixels 11, second sub-pixels 12, and third sub-pixels 13 in the present embodiment. The first to third sub-pixels 11, 12, and 13 are formed to emit light corresponding to, for example, red, green, and blue, respectively.

The wiring 5 is spirally wound (wound) around an axis extending in one direction and formed. The wiring 5 is formed so that the length in the axial direction when the spiral of the wiring 5 moves around the axis, that is, the pitch length becomes constant. Thereby, the wiring 5 follows and expands and contracts when the expansion board|substrate 2 is expanded and contracted in the axial direction.

The material of the wiring 5 is, for example, any of copper, gold, silver, aluminum, titanium, molybdenum, tungsten, nickel, iron, and alloys thereof, but is not limited thereto as long as it is a material having high conductivity. Further, it may be a laminate of these substances.

The wiring 5 includes a first wiring 5a and a second wiring 5b. The first wiring 5a extends in the second direction X and is provided so as to connect between the display elements 4 adjacent in the second direction X. The second wiring 5b extends in the first direction Y and is provided so as to connect between the display elements 4 adjacent in the first direction Y. Between the display elements 4 adjacent in the first direction (Y), the number according to the number of sub-pixels in the display element 4, for example, in this embodiment, three second wirings 5b are connected and installed. Has been.

In this way, the first wiring 5a and the second wiring 5b are provided in the stretchable substrate 2 in a lattice shape.

3 is an explanatory diagram showing the circuit configuration of the first electronic circuit 3 realized as the active matrix type stretch display device 1. Fig. 4(a) is a plan view of the display element 4 in the case where the stretchable display device 1 is a passive matrix system, and Fig. 4(b) shows the display element 4 from the first direction Y, particularly A side view as viewed from the lower side of the page in Fig. 4(a) and Fig. 4(c) show that the display element 4 is viewed from the second direction X, and in particular, the right side of the page in Fig. 4(a). It is a side view as seen from. 5 is a schematic side view showing the configuration of the display element 4 in the case where the stretchable display device 1 is an active matrix system.

The display element 4 shown in Fig. 4 is used in the passive matrix type stretch display device 1, and has a configuration not including a transistor. In this case, the first wiring 5a corresponds to the scanning line, and the second wiring 5b corresponds to the data line. Each wiring 5a, 5b is connected to a corresponding electrode 16, and the electrode 16 is connected to each of the first to third sub-pixels 11, 12, 13.

The display element 4 shown in FIG. 5 is used in the active matrix type stretch display device 1 and has a structure including a transistor 14. In this case, the first wiring 5a corresponds to the gate line, and the second wiring 5b corresponds to the source line.

In more detail, each display element 4 includes a transistor 14 corresponding to each of the first to third sub-pixels 11, 12, and 13. The source 4a of each transistor 14 is connected to a second wiring 5b corresponding to each of the first to third sub-pixels 11, 12, and 13 through a corresponding electrode 16. The first wiring 5a is connected to the gate 4b of each transistor 14. The drain 4c of each transistor 14 is connected to each of the first to third sub-pixels 11, 12, and 13.

In addition, the common electrode connected to each of the first to third sub-pixels 11, 12 and 13 in the active matrix system is omitted in FIG. 5.

The stretchable display device 1 in this embodiment may be an active matrix system or a passive matrix system. In any of these cases, when the first wiring 5a is sequentially turned on and a voltage corresponding to the display level at this time is supplied to the second wiring 5b, each of the first to third subpixels ( As the voltage is transmitted to the 11, 12, and 13, an image is displayed on the stretch display device 1.

The stretchable substrate 2 is provided with an augitive structure 20. 6 is a cross-sectional view of a portion A-A in FIG. 2. FIG. 7 is an enlarged view of a cross-sectional view of part B of FIG. 6. Fig. 8 is a perspective view of a section B cross section.

In particular, in this embodiment, the augitive structure 20 is formed in a planar shape so as to have an auxetic material configured such that the Poisson's ratio becomes a negative value. Since the augitive structure 20 is configured such that the Poisson's ratio becomes a negative value as described above, when it is elongated in one direction, it is elongated in a plane orthogonal to this one direction within the plane forming the augitive structure 20.

Here, the increase in length includes not only the case where the total length of the object in one direction increases, but also the case where the length in the one direction is shorter than the total length is increased within a range not exceeding the total length. In addition, the Poisson's ratio having a negative value means that when the object is elongated in one direction, the entire length of the object in a direction orthogonal to the one direction is elongated, as well as the portion whose length in the orthogonal direction is shorter than the total length. This includes cases that are elongated within the range not exceeding the entire length.

The augitive structure 20 is formed of a material having a higher elasticity than the material forming the stretchable substrate 2. As a material for forming the augitive structure 20, for example, a resin such as polyimide, polyamide, or polyurethane can be used, but is not limited thereto.

The augitive structure 20 is installed in the stretchable substrate 2 in the present embodiment, and is particularly buried in the present embodiment.

As shown in Fig. 6, the augitive structure 20 has a structure in which a plurality of unit structures 21 are closely arranged when viewed in a plan view.

Each of the unit structures 21 has a virtual rectangle 30 extending in a first direction (Y) and a second direction (X) orthogonal to the first direction (Y) when viewed as an outer contour. Is formed.

The virtual rectangle 30 includes two first virtual sides 31 extending in a first direction (Y) and provided substantially parallel to each other, and two first virtual sides 31 extending in a second direction (X) and provided substantially parallel to each other. A second virtual side 32 is provided. Each of the first virtual side 31 and the second virtual side 32 meets each other at vertices 33 provided at four locations.

The unit structure 21 includes a first support plate 22, a second support plate 23, a first deformation plate 24, and a second deformation plate 25. Each of the first deformation plate 24 and the second deformation plate 25 is provided with a first swash plate 26 and a second swash plate 27. All of these members are plate members having substantially the same width and thickness. These plate materials are formed by the second direction (X) and the first direction (Y) so that the width direction coincides with the thickness direction (Z) orthogonal to each of the second direction (X) and the first direction (Y). It is erected and installed on a flat surface.

The first support plate 22 and the second support plate 23 have substantially the same length as the first virtual side 31, and are provided along each of the two first virtual sides 31.

The first deformation plate 24 is provided corresponding to the upper second virtual side 32 in FIG. 7. The first swash plate 26 constituting the first deformation plate 24 is virtually located inside the virtual rectangle 30 than the center portion of the second virtual side 32 on the upper side, that is, below the second virtual side 32. It is installed along an imaginary line 35 connecting the point 34 installed as a slit and the vertex 33 located in the upper left corner in FIG. 7. The second swash plate 27 constituting the first deformation plate 24 is provided along a virtual line 35 connecting the point 34 and the vertex 33 located in the upper right side in FIG. 7. .

In this way, the first deformable plate 24 is formed so that the first swash plate 26 and the second swash plate 27 are joined at an angle φ to each other at the center point 34. The end of the first swash plate 26 on the opposite side of the center point 34 is joined to the first support plate 22 at a vertex 33 in the upper left. The end of the second swash plate 27 on the opposite side of the center point 34 is joined to the second support plate 23 at the apex 33 at the upper right.

The second deformation plate 25 is provided corresponding to the lower second virtual side 32 in FIG. 7. The first swash plate 26 constituting the second deformable plate 25 is virtually inside the virtual rectangle 30 from the center portion of the second virtual side 32 on the lower side, that is, on the upper side than the second virtual side 32. It is installed along an imaginary line 35 connecting the point 34 installed as a slit and the vertex 33 located at the lower left in FIG. 7. The second swash plate 27 constituting the second deformable plate 25 is installed along an imaginary line 35 connecting the point 34 and the vertex 33 located at the lower right in FIG. 7. .

In this way, the second deformable plate 25 is formed so that the first inclined plate 26 and the second inclined plate 27 are joined at an angle φ to each other at the center point 34. The end of the first swash plate 26 on the opposite side of the center point 34 is joined to the first support plate 22 at the apex 33 at the lower left. The end of the second swash plate 27 on the opposite side of the center point 34 is joined to the second support plate 23 at the apex 33 at the lower right.

With the configuration as described above, each of the first swash plate 26 and the second swash plate 27 is provided inclined to extend inward of the virtual rectangle 30 with respect to the corresponding second virtual side 32 . The unit structure 21 is formed so that the inclination angle θ of the first swash plate 26 and the second swash plate 27 with respect to the second virtual side 32 is substantially equal.

As shown in FIG. 6, the augitive structure 20 is configured by aligning a plurality of unit structures 21.

The plurality of unit structures 21 are provided side by side in the second direction X, thereby forming one unit structure row 28. The second support plate 23A of the unit structure 21A shown in FIG. 6 is a unit structure 21B located on the side of the second support plate 23 of the unit structure 21A, that is, on the right side in FIG. WHEREIN: It is comprised so that it may become the 1st support plate 22B. In this way, the two unit structures 21 adjacent in the second direction X have a structure in which one support plate is shared.

Further, as described above, a plurality of unit structure rows 28 are formed, and the plurality of unit structure rows 28 are provided side by side in the first direction Y, thereby forming the augitive structure 20. The unit structure 21A shown in FIG. 6 is adjacent to the unit structure 21C constituting the unit structure row 28B under the unit structure row 28A to which the unit structure 21A belongs, in a first direction (Y). Are doing. The second swash plate 27A of the second deformable plate 25A of the unit structure 21A is configured to be the first swash plate 26C of the unit structure 21C and the first deformable plate 24C. In addition, the first swash plate 26B of the second deformable plate 25B of the unit structure 21B adjacent to the unit structure 21A in the second direction X is the first deformable plate 24C of the unit structure 21C. ), it is configured to be the second swash plate 27C. Thus, the two unit structures 21 adjacent in the first direction Y have a structure in which one swash plate is shared.

In the two unit structure rows 28A and 28B adjacent in the first direction (Y), the first support plate 22 and the second support plate 23 of the unit structure 21 in the one unit structure row 28A. ) Is formed to have a longer length in the first direction Y than the first support plate 22 and the second support plate 23 of the unit structure 21 in the adjacent row of the other unit structure 28B.

9 is a plan view showing the shape of the unit structure 21 when an elongation force acts on the augmented structure 20 as described above.

For example, with respect to the unit structure 21 as shown in FIG. 7, in the case where the stretching force PX acts in the second direction X, the first support plate 22 and the second support plate 23 They try to move so that they are separated from each other in the second direction (X). Along with this, the first swash plate 26 and the second swash plate 27 joined at the vertex 33 to these first support plate 22 and second support plate 23 are also in the second direction (X). However, since the first swash plate 26 and the second swash plate 27 are joined to each other at the center point 34, the angle between the first swash plate 26 and the second swash plate 27 (Φ) The first deformation plate 24 and the second deformation plate 25 are deformed so as to increase and become an angle Φ2 as shown in FIG. 9. As a result, the inclination angle θ, which is an angle between each of the first swash plate 26 and the second swash plate 27 and the virtual rectangle 30, is reduced to become the inclination angle θ2 as shown in FIG. 9, and the center point 34 It moves toward the outside of this virtual rectangle 30, that is, so as to approach the 2nd virtual side 32 of the virtual rectangle 30, and the distance between the center points 34 increases.

As described above, when the stretching force PX is applied in the second direction (X) with respect to the unit structure 21, the length of the unit structure 21 increases in the first direction (Y), as shown in FIG. It becomes the same shape.

In the unit structure 21, as described above, an elongation force (PX) acts on the unit structure 21 in a plane, so that the length (L1) of the second direction (X) in which the elongation force (PX) is applied increases to L2. The length (L3) between the center point 34 of the first deformation plate 24 and the second deformation plate 25 in the first direction (Y) orthogonal to the second direction (X) in this embodiment, especially in this embodiment It is formed so as to increase to L4. In this way, the unit structure 21 is the distance between the first deformation plate 24 and the second deformation plate 25 in the first direction Y when the elongation force PX acts in the second direction X, that is, Since the length in the first direction Y increases, the Poisson ratio is configured to be negative.

To the outside of the unit structure 21 at the center point 34, for example, in FIG. 7, support plates 22N and 23N of the other unit structures 21N adjacent in the first direction Y are joined. Therefore, by the movement of the center point 34 toward the second virtual side 32, the support plates 22N and 23N of the other unit structures 21N are moved to be separated from the unit structure 21, and as a result, the first direction ( The unit structures 21 adjacent to each other by Y) move so as to move away from each other. Accordingly, when the stretching force PX acts in the second direction X with respect to the augmented structure 20, the augitive structure 20 also extends in the first direction Y.

Conversely, in the case where the contraction force SX acts in the second direction X with respect to the unit structure 21 as shown in FIG. 9, the first support plate 22 and the second support plate 23 are the second Try to move to approach each other in direction (X). Along with this, the first swash plate 26 and the second swash plate 27 joined at the vertex 33 to these first support plate 22 and second support plate 23 are also in the second direction (X). Approaching, but since the first swash plate 26 and the second swash plate 27 are joined to each other at the center point 34, as a result, the angle between the first swash plate 26 and the second swash plate 27 (Φ2) The first deformation plate 24 and the second deformation plate 25 are deformed so that is reduced to become an angle Φ as shown in FIG. 7. Thereby, the inclination angle θ2 increases to become the inclination angle θ as shown in FIG. 7, and the center point 34 is toward the inside of the virtual rectangle 30, that is, the second virtual side of the virtual rectangle 30 By moving away from (32), the distance between the center points (34) decreases.

As described above, when the contraction force SX is applied to the unit structure 21 in the second direction X, the length of the unit structure 21 decreases in the first direction Y, as shown in FIG. 7. It becomes the same shape.

By the movement of the center point 34 in the direction separated from the second virtual side 32, the support plates 22N and 23N of the other unit structures 21N adjacent in the first direction Y are transferred to the unit structure 21 And, as a result, the unit structures 21 adjacent to each other in the first direction Y move to approach each other. As a result, when the contractive force SX is applied to the augmented structure 20 in the second direction X, the agetic structure 20 also contracts in the first direction Y.

In addition, with respect to the unit structure 21 as shown in FIG. 7, when the stretching force PY acts in the first direction (Y), the unit structures 21 adjacent to each other in the first direction (Y) Trying to move away. Accordingly, from the unit structure 21, the support plates 22N and 23N of the other unit structures 21N adjacent in the first direction Y are moved so as to be separated, and the center point 34 of the unit structure 21 is a virtual rectangle ( The distance between the center points 34 is increased by moving in the first direction Y so as to approach the second virtual side 32 of the virtual rectangle 30 toward the outside in 30). In the first swash plate 26 and the second swash plate 27 joined to each other at the center point 34, the opposite ends of the center point 34 are joined to the first support plate 22 and the second support plate 23, respectively. Therefore, the end side of the opposite side cannot move in the first direction Y, and thus the center point 34 relatively moves in the first direction Y with respect to the opposite end side. This increases the angle Φ between the first swash plate 26 and the second swash plate 27 to become the same angle Φ 2 as shown in FIG. 9, so that the first and second deformation plates 24 and 25 Is transformed. As a result, the inclination angle θ is reduced to become the inclination angle θ2 as shown in FIG. 9. In this way, as the first and second deformation plates 24 and 25 are deformed to increase the length in the second direction X, the first support plate 22 and the second support plate 23 are It moves so as to be separated in the direction X, and the distance between the first support plate 22 and the second support plate 23 is increased.

The unit structure 21 is, in particular, in the first direction Y in which the stretching force PY is applied by the stretching force PY acting on the unit structure 21 in the plane as described above. When the length (L3) between the center of the first deformation plate 24 and the second deformation plate 25 is increased to L4, the length L1 in the second direction (X) orthogonal to the first direction (Y) is also L2 It is formed to increase to. In this way, the unit structure 21 is the distance between the first support plate 22 and the second support plate 23 in the second direction X when the stretching force PY acts in the first direction Y, that is, Since the length in the second direction X increases, the Poisson ratio is configured to be negative.

As described above, since the length of the unit structure 21 in the second direction (X) is increased in the entire area in the first direction (Y), the augitive structure 20 is moved in the second direction (X). Elongated.

Conversely, in the case where the contractile force SY acts in the first direction (Y) with respect to the unit structure 21 as shown in FIG. 9, the unit structures 21 adjacent to each other in the first direction (Y) Try to move to approach. Accordingly, the support plates 22N and 23N of the other unit structures 21N adjacent in the first direction Y are moved to approach the unit structure 21, and the center point 34 of the unit structure 21 is a virtual rectangle ( It moves in the first direction Y so as to be separated from the second virtual side 32 of the virtual rectangle 30 toward the inside in 30), that is, the distance between the center points 34 is reduced. In the first swash plate 26 and the second swash plate 27 joined to each other at the center point 34, the opposite ends of the center point 34 are joined to the first support plate 22 and the second support plate 23, respectively. Therefore, the end side of the opposite side cannot move in the first direction Y, and thus the center point 34 relatively moves in the first direction Y with respect to the opposite end side. This reduces the angle Φ2 between the first swash plate 26 and the second swash plate 27 to become an angle Φ as shown in FIG. 7, the first deformation plate 24 and the second deformation plate 25 Is transformed. As a result, the inclination angle θ2 increases to become the inclination angle θ as shown in FIG. 7. As such, the first deformation plate 24 and the second deformation plate 25 are deformed to reduce the length in the second direction X, so that the first support plate 22 and the second support plate 23 are in the second direction (X). By moving to approach, the distance between the first support plate 22 and the second support plate 23 is reduced.

As described above, when the contraction force SY acts in the first direction (Y) with respect to the unit structure 21, the length of the unit structure 21 decreases in the second direction (X), as shown in FIG. It becomes the same shape.

As described above, since the length of the unit structure 21 in the second direction (X) decreases in the entire area in the first direction (Y), the augitive structure 20 is moved in the second direction (X). Contracts.

Regarding the unit structure 21 of the augmentative structure 20 as shown in FIG. 7, the stretching force PD acts in a diagonal direction inclined with respect to both the second direction (X) and the first direction (Y). In the case, the stretching force (PX) and the stretching force (PY) are applied to each of the component forces obtained by decomposing this stretching force (PD) into the second direction (X) and the first direction (Y). Transformation works simultaneously. As a result, even in this case, the augitive structure 20 is elongated in a direction orthogonal to the direction in which the elongation force PD is applied.

Conversely, with respect to the unit structure 21 as shown in Fig. 9, when the contraction force SD acts in a diagonal direction inclined with respect to both the second direction (X) and the first direction (Y), this In the case where the contractive force (SX) and the contractive force (SY) are applied to each of the component forces that have decomposed the contractive force (SD) into the second direction (X) and the first direction (Y), the same deformation as described above acts simultaneously. . As a result, even in this case, the augitive structure 20 contracts in a direction orthogonal to the direction in which the contracting force SD was applied.

As described above, the unit structure 21 and the augitive structure 20 are the first deformation plate 24 and the second deformation plate 25 even when the stretching force and the contracting force act in any direction in the plane forming the same. As this deformation and the distance between the center points 34 are displaced, the elongation or contraction is equally extended or contracted in a direction orthogonal to the direction in which these elongation and contraction forces are applied. In this way, the unit structure 21 and the agetic structure 20 are configured such that the Poisson ratio becomes a negative value.

In this embodiment, the Poisson ratio of the unit structure 21 located in the inward direction part I than the value of the Poisson ratio of the unit structure 21 located in the peripheral circumferential part PE of the augitive structure 20 The augitive structure 20 is formed so that the value of is small, that is, the amount of displacement of the distance between the center points 34 at the time of expansion and contraction increases.

For example, in FIG. 6, the inclination angle θE of the unit structure 21E located in the inward direction part I is larger than the inclination angle θD of the unit structure 21D located in the peripheral circumferential part PE.

When the inclination angle θ of the first swash plate 26 and the second swash plate 27 and the second virtual side 32 is large in the case of non-stretching, between the first swash plate 26 and the second swash plate 27 Since the angle Φ of is smaller, the first support plate 22 and the second support plate 23 are brought closer to each other. In addition, the spread margin of the angle Φ between the first swash plate 26 and the second swash plate 27 when the augitive structure 20 is elongated increases. Accordingly, the separation distance between the first support plate 22 and the second support plate 23 during stretching increases. That is, when the inclination angle θ of the first swash plate 26 and the second swash plate 27 and the second virtual side 32 is large, the amount of displacement of the distance between the center points 34 at the time of expansion and contraction increases.

Conversely, when the inclination angle θ of the first swash plate 26 and the second swash plate 27 and the second virtual side 32 at the time of non-expansion is small, the first swash plate 26 and the second swash plate ( 27) Since the angle Φ between them increases, the first support plate 22 and the second support plate 23 are further separated from each other. In addition, the development value of the angle Φ between the first swash plate 26 and the second swash plate 27 when the augitive structure 20 is elongated decreases. Therefore, the separation distance between the first support plate 22 and the second support plate 23 at the time of stretching becomes small. That is, when the inclination angle θ of the first swash plate 26 and the second swash plate 27 and the second virtual side 32 is small, the amount of displacement of the distance between the center points 34 at the time of expansion and contraction decreases.

In this way, the unit structure 21E located in the inner direction part I is larger in the amount of displacement of the distance between the center points 34 at the time of expansion and contraction than the unit structure 21D located in the peripheral circumferential part PE. As such, the Poisson ratio of the unit structure 21 located in the inward direction part I is smaller than the Poisson ratio of the unit structure 21 located in the peripheral circumference PE of the augmentative structure 20, Accordingly, the Poisson's ratio of the augitive structure 20 is smaller in the inner direction portion I than the peripheral portion PE.

In particular, in the present embodiment, the augmentative structure 20 increases stepwise so that the inclination angle θ of the unit structure 21 increases as it moves from the peripheral circumferential portion PE to the inward direction portion I, that is, It is configured so that the value of Poisson's ratio decreases step by step.

In this embodiment, the display element 4 is installed in correspondence with both the vertex 33 of the virtual rectangle 30 and the center point 34 of the unit structure 21, and at these positions, the augmentative structure ( 20).

The augitive structure 20 as described above may be manufactured by various methods such as photolithography, inkjet, and mold processing.

In the case of photolithography, for example, by forming a layer made of a material that forms the organoid structure 20 such as polyimide on a substrate, forming a mask layer on the layer, and then performing etching to (20) can be formed.

In the case of the inkjet, the augitive structure 20 can be formed by spraying and attaching a solution in which the material forming the augitive structure 20 is melted onto the substrate so as to form a pattern in the shape of the augetic structure 20. .

In addition, in the case of mold processing, a mold that realizes the shape of the augitive structure 20 is manufactured, and a material that forms the augitive structure 20 is introduced and cured in the mold, thereby forming the augitive structure 20. Can be.

The augitive structure 20 may be manufactured by a manufacturing method other than the above.

Next, effects of the stretchable substrate 2 and the stretchable display device 1 will be described.

The stretchable substrate 2 of the present embodiment is a stretchable substrate 2 provided with an electronic circuit 3 and formed of a material having stretchability, and includes an augitive structure 20.

In addition, the stretchable display device 1 of this embodiment is a stretchable display device 1 having stretchability, and includes a stretchable substrate 2 formed of a stretchable material in which a plurality of display elements 4 are installed, The stretchable substrate 2 is provided with an augitive structure 20.

According to the above configuration, since the augitive structure 20 is installed on the stretchable substrate 2, even if the stretchable substrate 2 is stretched in a direction orthogonal to it when the stretching force is applied and attempts to contract in a perpendicular direction, This contraction cannot resist the elongation in the orthogonal direction of the augitive structure 20. As a result, the elastic substrate 2 is also elongated in the direction in which the elongation force is applied, and at the same time, in a direction orthogonal to this, it is elongated with the elongation of the augitive structure 20, or even if it is not elongated, it shrinks in the orthogonal direction. It is deformed so that it is relaxed.

As described above, the stretchable substrate 2 receives the stretching force in the direction in which the stretching force was applied and the direction orthogonal thereto when the stretching force was applied, so that a large reduction in local length in the orthogonal direction can be suppressed. Accordingly, local large deformation of the stretchable substrate 2 can be suppressed, and local distortion concentration on the electronic circuit 3 can be suppressed.

Further, as described above, since the stretchable substrate 2 is stretched in both directions orthogonal to the direction in which the stretching force is applied, the change in the in-plane dimensional ratio on the stretchable substrate 2 can be reduced during stretching. Accordingly, when an image is displayed on the stretchable display device 1, distortion of the displayed image can be reduced.

In addition, the augitive structure 20 is formed of a material having a higher elasticity than that of the material forming the stretchable substrate 2, and a plurality of unit structures 21 configured so that the Poisson's ratio becomes a negative value when viewed in a plane are formed side by side. Has been.

According to the above configuration, the unit structure 21 is configured such that the Poisson's ratio becomes a negative value when viewed in plan view. That is, when the elongation force acts on the unit structure 21 in the plane and the length in the direction in which the elongation force is applied increases, the length in the direction orthogonal to the direction in which the elongation force is applied in the plane is increased. 21) is formed. Since the unit structure 21 is arranged as described above, since the augitive structure 20 is formed, when a stretching force is applied to the augetic structure 20, the augitive structure 20 is elongated in the direction in which the stretching force is applied. , It extends in a direction orthogonal to it in the plane.

Since such an augitive structure 20 is made of a material having a higher elasticity than the material forming the stretchable substrate 2, the stretchable substrate 2 is stretched in a direction orthogonal to the stretch force applied thereto. Even if it tries to contract, this contraction cannot resist the elongation in the orthogonal direction of the augitive structure 20. As a result, the elastic substrate 2 is also elongated in the direction in which the elongation force is applied, and at the same time, the contraction in the orthogonal direction is alleviated even if it is not elongated or elongated due to the elongation of the augitive structure 20 in a direction orthogonal thereto. It is transformed to be.

As described above, since the stretchable substrate 2 receives the stretching force in each of the direction in which the stretching force was applied and the direction orthogonal thereto when the stretching force was applied, a large reduction in local length in the orthogonal direction can be suppressed. Accordingly, local large deformation of the stretchable substrate 2 can be suppressed, and local distortion concentration on the electronic circuit 3 can be suppressed.

In addition, the value of the Poisson's ratio of the unit structure 21 located in the inner directional portion I is smaller than the value of the Poisson's ratio of the unit structure 21 located in the peripheral circumference PE of the augitive structure 20 .

According to the above configuration, when the stretching force is applied to the stretchable substrate 2, in the inner direction portion I having a large change in length in a direction orthogonal to the direction in which the stretching force is applied, the value of the Poisson ratio is small, that is, The unit structure 21 having a large degree of elongation in the orthogonal direction is provided when the elongation force acts. Thereby, when the stretchable substrate 2 is elongated, it is possible to effectively resist shrinkage deformation in the inner direction portion I in particular.

Accordingly, it is possible to effectively realize the stretchable substrate 2 and the stretchable display device 1 capable of reducing local distortion concentration and display distortion on the electronic circuit 3 in the stretched state.

In addition, the unit structure 21 is formed as an outer contour of a virtual rectangle 30 extending in a second direction (X) orthogonal to the first direction (Y) and the first direction (Y) when viewed in plan view. And, the first and second support plates 22 and 23, erected and installed along each of the first virtual sides 31 extending in the first direction Y, and a second virtual extending in the second direction X The first and second deformation plates 24 and 25 are provided corresponding to the side 32, and each of the first and second deformation plates 24 and 25 is more virtual than the center of the second virtual side 32. The center point 34 located inside the rectangle 30 and the second virtual side 32 connecting the vertices 33 of the virtual rectangle 30 to which the second virtual side 32 connects. It is provided with the 1st and 2nd swash plates 26 and 27 which are erected and installed along each of the photographic virtual lines 35.

According to the above configuration, when the stretching force PX acts on the unit structure 21 in the second direction X, the first and second support plates 22 and 23 are moved in the second direction X. Further apart, the angle θ between the first and second swash plates 26 and 27 and the second virtual side 32 is reduced, and the angle Φ between the first and second swash plates 26 and 27 Is increased, and the center point 34 approaches the second virtual side 32. Thereby, the center point 34 corresponding to each of the two second virtual sides 32 is separated, and the vicinity of the central part of the unit structure 21, particularly in the second direction X, is in the first direction Y The length in is increased.

In addition, when the stretching force acts on the unit structure 21 in the first direction (Y), the center point 34 approaches the second virtual side 32 and between the first and second swash plates 26 and 27 The angle Φ of is increased, the angle θ between the first and second swash plates 26 and 27 and the second virtual side 32 is reduced, so that the first and second support plates 22 and 23 are It is further separated in the second direction X. Thereby, the length of the unit structure 21 in the second direction X is increased.

As described above, the unit structure 21 is configured such that the length in the direction orthogonal to the stretching direction increases even when the stretching force acts in any of the first and second directions (X, Y).

Accordingly, it is possible to effectively realize the stretchable substrate 2 and the stretchable display device 1 capable of reducing local distortion concentration and display distortion on the electronic circuit 3 in the extended state.

In addition, the plurality of unit structures 21 are installed side by side in a second direction (X) to form a unit structure row 28, and the second support plate 23 of the unit structure 21 is It is located on the side of the second support plate 23 and is the first support plate 22 in the adjacent unit structure 21.

In addition, a plurality of unit structure rows 28 are installed side by side in the first direction (Y), and the first and second swash plates 26 and 27 of the unit structure 21 constituting the unit structure row 28 are It is the first or second deformation plates 26 and 27 of the unit structure 21 constituting the unit structure rows 28 adjacent to each other in one direction (Y) and the unit structure 21 adjacent thereto.

According to the above configuration, the unit structures 21 can be closely arranged side by side.

Accordingly, it is possible to effectively realize the stretchable substrate 2 and the stretchable display device 1 capable of reducing local distortion concentration and display distortion on the electronic circuit 3 in the extended state.

In addition, when the stretching force acts on the unit structure 21 in the second direction (X), the first and second support plates 22 and 23 are further separated in the second direction (X), and the first and second inclined plates The angle θ between the (26, 27) and the second virtual side 32 is reduced, the angle Φ between the first and second swash plates 26, 27 increases, and the center point 34 is reduced. 2 Approach the virtual side 32.

According to the above configuration, the unit structure 21 is orthogonal to the second direction (X), especially in the vicinity of the central portion in the second direction (X), even when an elongation force is applied in the second direction (X). The stretchable substrate 2 and the stretchable display device 1 capable of reducing local distortion concentration and display distortion on the electronic circuit 3 in the stretched state because they are configured to be stretched in the first direction Y ) Can be effectively realized.

In addition, with respect to the unit structure 21, when the stretching force acts in the first direction (Y), the center point 34 approaches the second virtual side 32, and between the first and second swash plates 26 and 27 The angle Φ is increased, the angle θ between the first and second swash plates 26 and 27 and the second virtual side 32 is reduced, so that the first and second support plates 22 and 23 are It is further separated in two directions (X).

According to the above configuration, since the unit structure 21 is configured to be elongated in the second direction X orthogonal thereto even when an elongation force is applied in the first direction Y, in the state at the time of elongation A stretchable substrate 2 and a stretchable display device 1 capable of reducing local distortion concentration and display distortion on the electronic circuit 3 can be effectively realized.

In addition, the display element 4 is provided in correspondence with both the vertex 33 and the central point 34 of the virtual rectangle 30.

When a stretching force acts on the stretchable display device 1, the stretching force acts on each unit structure 21 of the augmented structure 20. Each of the support plates 22 and 23 and the swash plates 26 and 27 of the unit structure 21 are configured as a plate body, and when elongated, the surfaces of these plate bodies are adjacent and adjacent to the elastic substrate 2 such as an elastomer. It resists the force of the forming material that tries to stretch in a direction orthogonal to the direction in which the stretching force is applied. Therefore, stress acts on these plate bodies during elongation, and distortion is liable to occur.

On the contrary, in the vertex 33 and the center point 34 of the virtual rectangle 30, corresponding to the portion where each plate body of the unit structure 21 is joined to each other, a plurality of plate bodies are joined to each other from different directions in the plane. Since it is supported, it is easy to resist stress, and distortion is less likely to occur compared to the surface portion of the plate body. That is, according to the above-described configuration, since the display element 4 is installed corresponding to a portion where distortion of the augitive structure 20 is difficult to occur, the display element 4 is extended when the stretchable display device 1 is extended. ) It is possible to reduce the load applied to it.

In particular, in this embodiment, the display element 4 is fixed to the augmentative structure 20.

According to such a configuration, it is possible to reduce the deviation of the pitch between the display elements 4 during extension.

In addition, the augitive structure 20 is provided on the stretchable substrate 2.

According to the above configuration, the stretchable display device 1 can be preferably realized.

<First modified example of embodiment>

Next, a first modified example of the stretchable substrate 2 and the stretchable display device 1 shown as the above embodiment will be described with reference to FIGS. 10 and 11. 10 is a plan view of a stretchable substrate and a stretchable display device according to the first modified example. FIG. 11 is a plan view of a stretchable substrate and a stretchable display device in the first modified example as viewed from the Y direction in FIG. 10. In the stretchable display device 41 according to the first modified example, the arrangement of the display elements 4 is different from that of the stretchable display device 1 of the above embodiment.

As previously described, in the two unit structure rows 28A and 28B adjacent in the first direction (Y) of the augitive structure 20, in one unit structure row (first unit structure row, 28A) The first support plate 22 and the second support plate 23 of the unit structure 21 are the unit structure 21 in the other unit structure row (second unit structure row, 28B) adjacent in the first direction (Y). The length in the first direction Y is formed longer than that of the first support plate 22 and the second support plate 23.

In this modified example, the display element 4 is the first and second support plates 22 and 23 formed elongated in the first unit structure row 28A, particularly these first and second support plates 22 and 23 It is installed corresponding to the central part of the.

When the stretching force acts on the stretchable substrate 42, the Poisson's ratio of the augmentative structure 20 is configured to be negative, so the stretchable substrate 42 is stretched in the direction in which the stretching force is applied and at the same time it is stretched in a direction orthogonal thereto. Or it is deformed so that the shrinkage in the orthogonal direction is relieved. Since the stretchable substrate 42 is formed of a material having a positive Poisson ratio such as an elastomer, when the stretchable substrate 42 is deformed as described above in each of two orthogonal directions in this plane, the stretchable substrate 42 The thickness of the stretchable substrate 42 is reduced because it attempts to maintain the volume of.

Here, in each unit structure 21, since the material forming the stretchable substrate 42 installed around the unit structure 21 is supported by the support plates 22, 23, the stretching of the stretchable substrate 42 It is hard to be affected, and it is hard to cause distortion that occurs in the thickness direction. That is, according to the above configuration, since the display element 4 is installed in correspondence with a portion where distortion of the material forming the stretchable substrate 42 is unlikely to occur, the stretchable display device 41 is elongated. It is possible to reduce the load applied to the display element 4.

In particular, in this modified example, as shown in FIG. 11, the display elements 4 are provided with respect to the augmented structure 20 in the thickness direction Z apart.

In the present modified example, since the display element 4 is installed away from the augmented structure 20, when the stretchable substrate 42 is elongated as described above and the thickness of the stretchable substrate 42 is reduced, the stretchable substrate ( Due to the stress applied to the material constituting 42), it is difficult for the display element 4 to be pressed against the augitive structure 20. Accordingly, it is possible to reduce the load applied to the display element 4 when the stretchable display device 41 is elongated.

It goes without saying that this first modification has the same other effects as the previously described embodiment.

<Second modification of the embodiment>

Next, referring to FIG. 12, a second modified example of the stretchable substrate 2 and the stretchable display device 1 shown as the above embodiment will be described. 12 is a plan view of an augmentative structure of a stretchable substrate and a stretchable display device according to the second modified example. The stretchable substrate 52 and the stretchable display device 51 in the second modified example include the stretchable substrate 2 and the stretchable substrate 2 of the above-described embodiment in the arrangement of the unit structure 54 in the organizing structure 53. It is different from the stretchable display device 1.

In more detail, in this modification, the unit structure 54 is provided more in the inner direction part I side than the peripheral circumferential part PE of the augitive structure 53.

According to the above configuration, when the stretching force is applied to the stretchable substrate 52, the length in the direction orthogonal to the inner direction portion I having a large change in length in a direction orthogonal to the direction in which the stretching force is applied The unit structure 54 in which is increased is provided more than the peripheral portion PE. Thereby, when the stretchable substrate 52 is elongated, it is possible to effectively resist the contraction deformation in the inner direction portion I in particular.

Accordingly, it is possible to effectively realize the stretchable substrate 52 and the stretchable display device 51, which can reduce local distortion concentration and display distortion on the electronic circuit in the stretched state.

It goes without saying that this second modification has the same other effects as the previously described embodiment.

In addition, the stretchable substrate and the stretchable display device of the present invention are not limited to the above-described embodiments and respective modified examples described with reference to the drawings, and various other modified examples can be considered within the technical scope.

For example, in the above embodiment, the augitive structure 20 was buried in the stretchable substrate 2, but it is necessary to say that the augitive structure 20 may be fixed to the stretchable substrate 2 by a configuration other than this. Nothing.

In the stretchable display device 61 of Fig. 13A, the stretchable substrate 62 includes a stretchable substrate main body 63 in which the display element 4 is installed, and a support substrate 64, and an augitive structure ( 20) is provided on the support substrate 64, and the support substrate 64 is a surface of the stretchable substrate main body 63 on the opposite side of the display side D where the display by the display element 4 is visually confirmed ( 63a).

According to the above configuration, a stretchable display device can be advantageously realized. In particular, since the augmented structure 20 is bonded to the surface 63a on the opposite side of the display side D, the agetic structure 20 does not impede display by the display element 4.

In addition, in the stretchable display device 71 of FIG. 13B, the stretchable substrate 72 includes a stretchable substrate main body 73 provided with a display element 4 and a support substrate 74. The augitive structure 75 is installed on the support substrate 74, the augitive structure 75 and the support substrate 74 are formed of a transparent material, and the support substrate 74 is a stretchable substrate main body 73 Of, the display by the display element 4 is bonded to the surface 73b of the display side D that can be seen with the naked eye.

According to the above configuration, the stretchable display device 71 can be preferably realized. The augitive structure 75 and the support substrate 74 are bonded to the display side D, but the augitive structure 75 and the support substrate 74 are formed of a transparent material, so that the display device 4 It is difficult to impede the display by.

In the stretchable display device 71, similarly to the stretchable display device 61, on the surface 73a on the opposite side of the display side D of the stretchable substrate main body 73, the support substrate ( 76) is joined. However, the support substrate 74 provided with the augitive structure 75 may be bonded only to the display side (D) surface 73b of the stretchable substrate main body 73.

In addition, in the stretchable display device 71, although both the augitive structure 75 and the support substrate 74 are formed of a transparent material, only one of them is transparent if display by the display element 4 is not impeded. It may be formed of a material.

In addition, in each of the above-described embodiments and the modified examples described with reference to FIG. 13, the augitive structure was configured to be buried in a stretchable substrate and a support substrate, but is not necessarily limited thereto. It may be bonded to the surface of the support substrate.

In addition, in the above embodiment, the display element 4 is provided in correspondence with both the vertex 33 and the central point 34 of the virtual rectangle 30, but either of the vertex 33 and the central point 34 It may be installed in response to only.

In addition, the augmentative structure in the above embodiment and each modification is formed in a plane shape, and is configured to be elongated in a direction orthogonal to the direction in which the elongation force is applied when the elongation force is applied in a direction parallel to the plane. there was. As described above, since the material forming the stretchable substrate has a positive Poisson's ratio, the thickness of the stretchable substrate decreases due to the deformation affected by the elongation of the augitive structure in two orthogonal directions in this plane. Is reduced.

In order to further reduce the load applied to the display element due to this reduction in thickness, as an augitive structure, as in the above embodiment, an augitive structure is formed in a plane, while the thickness direction perpendicular to the plane when an elongation force is applied ( Also in Z), the augitive structure may be formed three-dimensionally, for example, three-dimensionally so that the structure is elongated.

In addition, in the above-described embodiment and each of the modifications, as a unit structure constituting the augitive structure, a combination of plate bodies as shown in FIG. 7 was used. This is due to reasons such as that the structure is simplified so that design and manufacturing are easy, the deformation mechanism when the elongation force is applied is clear, and the desired Poisson's ratio is easily realized. However, the shape of the unit structure is not necessarily limited to the ones described above, if it is possible to realize trouble-free performance in these, for example, other shapes such as those shown as the unit structures 81, 82, 83 in FIG. It does not matter if it is equipped. Alternatively, the unit structure 21 shown as the above embodiment and the unit structures 81, 82, 83 may be used in combination.

In addition, in the above-described embodiment and each modification, the augitive structure was formed of a resin, but instead, it may be formed of a material having higher elasticity than that of metal, for example. In this case, in order to facilitate the deformation when the elongation force acts on the augmentative structure, the plate bodies are joined by hinges at the vertex 33 and the central point 34, and the vertex 33 and the central point 34 It may be installed freely to change the angle between the plate bodies centering on the.

In addition to this, it is possible to select the configurations exemplified in the above embodiments and each modification, or appropriately change to other configurations, as long as they do not depart from the gist of the present invention.

For example, for the augitive structure 53 in which the unit structures 54 are arranged in a distribution as shown in the second modification, the display element 4 is used as a first support plate as shown in the first modification. (22) You may install in correspondence with the 2nd support plate 23.

1, 41, 51, 61, 71: stretch display device 2, 42, 52, 62, 72: stretch substrate
3: electronic circuit 4: display element
20, 53, 75: aggetic structure 21, 54, 81, 82, 83: unit structure
22: first support plate 23: second support plate
24: first deformation plate 25: second deformation plate
26: first swash plate 27: second swash plate
28: unit structure row 28A: first unit structure row
28B: second unit structure row 30: virtual rectangle
31: first virtual side 32: second virtual side
33: vertex 34: center point
35: virtual line 63, 73: elastic substrate body
63a, 73a: surface opposite to the display side 64, 74, 76: support substrate
73b: display side surface D: display side
X: second direction Y: first direction
Z: Thickness direction I: Inward direction
PE: peripheral circumference
θ: inclination angle (angle between the first and second inclined plates and the second virtual side)
φ: angle between the first and second swash plate

Claims (21)

An electronic circuit is installed and is a stretchable substrate formed of a material having stretchability,
A stretchable substrate with an augitive structure.
The method of claim 1,
The augmented structure is formed of a material having a higher elasticity than that of the material, and a plurality of unit structures configured such that a Poisson's ratio becomes a negative value when viewed in plan are formed side by side.
The method of claim 2,
A stretch substrate having a Poisson's ratio value of the unit structure positioned in an inward direction lower than the value of the Poisson's ratio of the unit structure positioned at the periphery of the augitive structure.
The method of claim 3,
The unit structure is a stretchable substrate that is provided more in the inner direction side than the peripheral circumference of the augitive structure.
The method according to any one of claims 2 to 4,
The unit structure is formed as an outer contour of a virtual rectangle whose sides extend in a first direction and a second direction orthogonal to the first direction when viewed in plan view,
First and second support plates erected and installed along each of the first virtual sides extending in the first direction,
With first and second deformation plates installed corresponding to a second virtual side extending in the second direction,
Each of the first and second deformation plates is at the center point located inside the virtual rectangle than at the center of the second virtual side, and the second virtual side connecting each vertex of the virtual rectangle to which the second virtual side is connected. A stretchable substrate comprising first and second swash plates that are erected and installed along each of the virtual lines inclined to each other.
The method of claim 5,
The plurality of unit structures are installed side by side in the second direction to form a row of unit structures,
The second support plate of the unit structure is located on the side of the second support plate of the unit structure and is the first support plate in the adjacent unit structure.
The method of claim 6,
A plurality of rows of the unit structures are installed side by side in the first direction,
The first and second swash plates of the unit structure constituting the unit structure row are the unit structures constituting the unit structure row adjacent to the unit structure row, and the first or second modified plate of the unit structure adjacent thereto. Stretchable substrate.
The method of claim 5,
With respect to the unit structure, when the stretching force acts in the second direction, the first and second support plates are further separated in the second direction, and the angle between the first and second swash plates and the second virtual side Is reduced, the angle between the first and second inclined plates is increased, so that the center point approaches the second virtual side.
The method of claim 5,
With respect to the unit structure, when the stretching force acts in the first direction, the center point approaches the second virtual side, the angle between the first and second swash plates increases, and the first and second swash plates An angle between the and the second virtual side is reduced, so that the first and second support plates are further separated in the second direction.
As a stretch display device having elasticity,
And a stretchable substrate formed of a material having stretchability on which a plurality of display elements are installed,
The stretchable display device includes the stretchable substrate and an augitive structure.
The method of claim 10,
The augitive structure is formed of a material having a higher elasticity than that of the material, and a plurality of unit structures configured so that the Poisson's ratio becomes a negative value when viewed in plan are formed side by side.
The method of claim 11,
A stretch display device in which a Poisson's ratio of the unit structure positioned in an inward direction is smaller than a value of the Poisson's ratio of the unit structure positioned at the periphery of the augitive structure.
The method of claim 12,
The unit structure is a stretch display device that is provided more in the inner direction side than the peripheral circumference of the augitive structure.
The method according to any one of claims 11 to 13,
The unit structure is formed as an outer contour of a virtual rectangle whose sides extend in a first direction and a second direction orthogonal to the first direction when viewed in plan view,
First and second support plates erected and installed along each of the first virtual sides extending in the first direction,
It includes first and second deformation plates installed corresponding to the second virtual side extending in the second direction,
Each of the first and second deformable plates connects a center point positioned inside the virtual rectangle than the center of the second virtual side and each vertex of the virtual rectangle to which the second virtual side is connected, the second virtual A new display device comprising first and second swash plates erected and installed along each of the virtual lines inclined with respect to the side.
The method of claim 14,
The plurality of unit structures are installed side by side in the second direction to form a row of unit structures,
The second support plate of the unit structure is located on the side of the second support plate of the unit structure and is the first support plate of the unit structure adjacent to the unit structure.
The method of claim 15,
A plurality of rows of the unit structures are installed side by side in the first direction,
The first and second swash plates of the unit structure constituting the unit structure row are the unit structures constituting the unit structure row adjacent to the unit structure row, and the first or second modified plate of the unit structure adjacent thereto. Telescopic display device.
The method of claim 14,
The display element is a new display device provided in correspondence with one or both of the vertex and the center point of the virtual rectangle.
The method of claim 16,
The display device is a new display device provided in correspondence with the first and second support plates of the row of the first unit structure.
The method of claim 10,
The flexible display device is provided on the flexible substrate.
The method of claim 10,
The stretchable substrate includes a stretchable substrate body on which the display element is installed, and a support substrate,
The augitive structure is installed on the support substrate,
The support substrate is bonded to a surface opposite to a display side where a display by the display element of the stretch substrate main body is visible.
The method of claim 10,
The stretchable substrate includes a stretchable substrate body on which the display element is installed, and a support substrate,
The augitive structure is installed on the support substrate,
Any one or both of the augitive structure and the support substrate is formed of a transparent material,
The support substrate is a stretchable display device in which a display by the display element of the stretchable substrate main body is bonded to a display side surface that is visible with the naked eye.

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