Stretchable device

Abstract

A stretchable device is provided that includes a substrate, an electronic structure layer, a first stretchable cover layer, and a second stretchable cover layer. The electronic structure layer is disposed on the substrate. The first stretchable covering layer is located between the electronic structure layer and the second stretchable covering layer. An elastic modulus of the second stretchable cover layer is greater than an elastic modulus of the first stretchable cover layer.

Description

Technical Field

[0001] The present invention relates to a stretchable device. Background Art

[0002] In existing stretchable display devices, only a single layer of OC (over coating) glue is configured on the display structure layer. This OC glue is usually a surface-drying material, and its surface is smooth and non-sticky after curing. For stretchable display devices with an overall stretching amount of 1% to 5%, this OC glue meets the stretching requirements and does not cause problems such as protective film adhesion. However, for stretchable display devices with an overall stretching amount greater than 10%, the elastic modulus of this OC glue is too high. However, if it is replaced with OC glue with a lower elastic modulus, the problem of protective film adhesion may occur. Summary of the Invention

[0003] The present invention provides a stretchable device with good stretching deformation capability and high yield.

[0004] According to one embodiment of the present invention, a stretchable device is provided, comprising a substrate, an electronic structure layer, a first stretchable cover layer, and a second stretchable cover layer. The electronic structure layer is disposed on the substrate. The first stretchable cover layer is positioned between the electronic structure layer and the second stretchable cover layer. The elastic modulus of the second stretchable cover layer is greater than the elastic modulus of the first stretchable cover layer.

[0005] Based on the above, in the stretchable device provided according to an embodiment of the present invention, a stretchable covering layer with a smaller elastic modulus and a stretchable covering layer with a larger elastic modulus are sequentially configured on the electronic structure layer. The former can avoid excessive stress on the electronic structure layer, and the latter can avoid adhesion of the subsequently configured protective film or breakage of the subsequently configured adhesive layer, thereby greatly improving the yield of the stretchable device, and the stretchable device can still have good tensile deformation ability.

[0006] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A schematic diagram showing a stretchable device according to an embodiment of the present invention.

[0008] Figure 2 Strain curves of multiple components in a stretchable device according to a comparative example and strain curves of multiple components in a stretchable device according to an embodiment of the present invention are shown.

[0009] The accompanying drawings are described as follows:

[0010] 1: Stretchable device

[0011] 10:Substrate

[0012] 101: Stretchable Cover

[0013] 102: Stretchable cover

[0014] 200:Electronic structure layer

[0015] 201: Electronic components, light-emitting diodes

[0016] 303: Stretchable layer

[0017] AR: Active Area

[0018] C1, C2, C3, C4, C5, C6: curves

[0019] GL: glue layer

[0020] PR: Peripheral area. DETAILED DESCRIPTION

[0021] Reference Figure 1 , which shows a schematic diagram of a stretchable device according to an embodiment of the present invention.

[0022] The stretchable device 1 of this embodiment has an active region AR and a peripheral region PR, and includes a substrate 10, an electronic structure layer 200, a stretchable cover layer 101, and a stretchable cover layer 102. The electronic structure layer 200 includes at least one electronic component 201. The electronic structure layer 200, the stretchable cover layer 101, and the stretchable cover layer 102 are sequentially disposed on the substrate 10 along the Z direction. The elastic modulus of the stretchable cover layer 102 is greater than that of the stretchable cover layer 101.

[0023] It should be noted that in this embodiment, the stretchable cover layer 101 closer to the electronic structure layer 200 has a lower elastic modulus, which can prevent excessive stress in the electronic structure layer 200 when the stretchable device 1 is stretched. In addition, the surface viscosity of the stretchable cover layer 102 with a larger elastic modulus after curing is lower than that of the stretchable cover layer 101 with a smaller elastic modulus after curing. Therefore, the surface of the stretchable cover layer 102 farther from the electronic structure layer 200 is more suitable for the configuration of a protective film than the surface of the stretchable cover layer 101 farther from the electronic structure layer 200, which can prevent the protective film from sticking.

[0024] In some embodiments, the elastic modulus of the stretchable cover layer 102 may fall within the range of 30 MPa to 1 GPa, and / or the elastic modulus of the stretchable cover layer 101 may fall within the range of 1 MPa to 10 MPa. In some embodiments, the stretchable cover layer 101 has an elongation that falls within the range of 100% to 1500%. In some embodiments, the stretchable cover layer 101 has a maximum elongation, the stretchable cover layer 102 has a maximum elongation, and the ratio of the maximum elongation of the stretchable cover layer 102 to the maximum elongation of the stretchable cover layer 101 is less than 0.7. Accordingly, the stretchable device can have a stretchability greater than 5%, or even greater than 10%, without causing excessive stress on the electronic structure layer 200 and adhesion of the protective film.

[0025] Reference Figure 1 , the stretchable device 1 of this embodiment may further include a glue layer GL, whose elastic modulus is smaller than the elastic modulus of the stretchable cover layer 101 and falls within the range of 0.01MPa to 1MPa. In a comparative example, the stretchable device 1 does not have a stretchable cover layer 102, and the glue layer GL is arranged on the surface of the stretchable cover layer 101 away from the electronic structure layer 200. When the stretchable device 1 of this comparative example is stretched, since the stretchable cover layer 101 has a smaller elastic modulus, the glue layer GL thereon is prone to cohesive failure. In contrast, in Figure 1 In the illustrated embodiment, since the stretchable cover layer 102 is located between the glue layer GL and the stretchable cover layer 101 , the stretchable cover layer 102 having a higher elastic modulus can prevent the glue layer GL from breaking when the stretchable device 1 is stretched.

[0026] like Figure 1 As shown, the stretchable device 1 of this embodiment may further include a stretchable layer 303, wherein the adhesive layer GL is used to adhere the stretchable layer 303 and the stretchable cover layer 102. In some embodiments, the stretchable layer 303 is a protective film, but is not limited thereto.

[0027] In some embodiments, the stretchable device 1 may be a stretchable display panel, the electronic component 201 may be a light emitting diode, the adhesive layer GL may be a transparent optical adhesive layer, and the stretchable layer 303 may be a stretchable touch layer, but the present invention is not limited thereto.

[0028] Also refer to Figure 1In some embodiments, the stretchable device 1 may also satisfy the conditional formula E2*H2>3*E1*H1, where H1 is the maximum thickness of the stretchable cover layer 101 in the normal direction (Z direction) of the substrate 10, H2 is the maximum thickness of the stretchable cover layer 102 in the Z direction, E1 is the elastic modulus of the stretchable cover layer 101, and E2 is the elastic modulus of the stretchable cover layer 102. Accordingly, the stretchable cover layer 102 can have sufficient stiffness to cause the stretchable device 1 to rebound (or retract) after deformation.

[0029] It should be noted that, in some embodiments, the stretchable device 1 may have a stretchable region and a non-stretchable region. In the stretchable region of the stretchable device 1, the stretchable covering layer 102 may be as follows: Figure 1 The configuration shown is on the side of the stretchable cover layer 101 away from the substrate 10. In the non-stretchable region of the stretchable device 1, the substrate 10 may have both the stretchable cover layer 101 and the stretchable cover layer 102 above it, or only one of the stretchable cover layer 101 and the stretchable cover layer 102.

[0030] Also refer to Figure 1 In some embodiments, the stretchable device 1 is a stretchable display panel, the electronic component 201 is a light-emitting diode 201, and the refractive index of the adhesive layer GL is greater than or equal to the refractive index of the stretchable cover layer 102. This prevents total internal reflection of light generated by the light-emitting diode 201 when it enters the adhesive layer GL from the stretchable cover layer 102. In some embodiments, the refractive index of the stretchable cover layer 102 is greater than or equal to the refractive index of the stretchable cover layer 101. This prevents total internal reflection of light generated by the light-emitting diode 201 when it enters the stretchable cover layer 102 from the stretchable cover layer 101.

[0031] Reference Figure 2 , which depicts strain curves of multiple components in a stretchable device according to a comparative example and strain curves of multiple components in a stretchable device according to an embodiment of the present invention, wherein the stretchable device of the comparative example and the stretchable device of the embodiment of the present invention are both stretchable display panels. Figure 2 Curves C1, C3, and C5 are strain curves of the polymer traces, metal traces, and island structures in the stretchable device of the comparative example, respectively. Curves C2, C4, and C6 are strain curves of the polymer traces, metal traces, and island structures in the stretchable device of the embodiment of the present invention, respectively. The stretchable device according to the comparative example is only provided with the stretchable cover layer 101. The stretchable device according to the embodiment of the present invention has both the stretchable cover layer 101 and the stretchable cover layer 102, and has the following features: Figure 1As shown in the structure, it can be seen that the strain curves of the multiple components in the stretchable device according to the comparative example and the strain curves of the multiple components in the stretchable device according to the embodiment of the present invention are consistent. In other words, even if the stretchable cover layer 102 is configured on the stretchable cover layer 101, the stretchable device can still have good stretching deformation capabilities.

[0032] To sum up, in the stretchable device provided according to an embodiment of the present invention, a stretchable covering layer with a smaller elastic modulus and a stretchable covering layer with a larger elastic modulus are sequentially configured on the electronic structure layer. The former can avoid excessive stress on the electronic structure layer, and the latter can avoid adhesion of the subsequently configured protective film or breakage of the subsequently configured adhesive layer, thereby greatly improving the yield of the stretchable device, and the stretchable device can still have good tensile deformation ability.

Claims

1. A stretchable device comprising: a substrate; an electronic structure layer, disposed on the substrate; a first stretchable cover layer; as well as a second stretchable covering layer, wherein the first stretchable covering layer is located between the electronic structure layer and the second stretchable covering layer, wherein The second stretchable cover layer has an elastic modulus greater than an elastic modulus of the first stretchable cover layer.

2. The stretchable device of claim 1, wherein the stretchable device has a stretchability greater than 5%.

3. The stretchable device of claim 1 , wherein the stretchable device further satisfies the conditional formula E2*H2>3*E1*H1, where H1 is the maximum thickness of the first stretchable covering layer in the normal direction of the substrate, H2 is the maximum thickness of the second stretchable covering layer in the normal direction, E1 is the elastic modulus of the first stretchable covering layer, and E2 is the elastic modulus of the second stretchable covering layer.

4. The stretchable device of claim 1 , wherein the first stretchable cover layer has a first maximum elongation, the second stretchable cover layer has a second maximum elongation, and a ratio of the second maximum elongation to the first maximum elongation is less than 0.

7.

5. The stretchable device of claim 1, wherein the first stretchable cover layer has an elongation within a range of 100% to 1500%. The stretchable device of claim 1 , wherein the elastic modulus of the second stretchable cover layer falls within the range of 30 MPa to 1 GPa. The stretchable device of claim 1 , wherein the elastic modulus of the first stretchable cover layer falls within a range of 1 MPa to 10 MPa.

8. The stretchable device of claim 1, further comprising an adhesive layer, wherein the second stretchable cover layer is located between the adhesive layer and the first stretchable cover layer.

9. The stretchable device of claim 1, further comprising a third stretchable cover layer and an adhesive layer, wherein the adhesive layer is located between the third stretchable cover layer and the second stretchable cover layer. 10 . The stretchable device according to claim 1 , wherein the stretchable device is a stretchable display panel, and further comprises a stretchable touch layer and an adhesive layer, wherein the adhesive layer is located between the stretchable touch layer and the second stretchable cover layer.

11. The stretchable device of claim 9 or 10, wherein the elastic modulus of the adhesive layer is smaller than the elastic modulus of the first stretchable cover layer.

12. The stretchable device according to claim 9 or 10, wherein the elastic modulus of the adhesive layer falls within the range of 0.01 MPa to 1 MPa. 13 . The stretchable device according to claim 9 , wherein the stretchable device is a stretchable display panel, and the refractive index of the adhesive layer is greater than or equal to the refractive index of the second stretchable cover layer.

14. The stretchable device of claim 13, wherein the refractive index of the second stretchable cover layer is greater than or equal to the refractive index of the first stretchable cover layer.

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