Flexible PEDOT touch screen and curved surface touch module

Abstract

The utility model discloses a flexible PEDOT (poly (3, 4-ethylenedioxythiophene)) touch screen. The flexible PEDOT touch screen comprises a polymer substrate; the Al2O3 / HfO3 superlattice film layer is arranged on the upper surface of the polymer substrate; the PEDOT electrode layer is arranged on the upper surface of the Al2O3 / HfO3 superlattice film layer; and the UV absorption layer is arranged on the upper surface of the PEDOT electrode layer. The flexible PEDOT touch screen still has relatively high stability in a humid and UV environment. The utility model further discloses a curved surface touch module which comprises the flexible PEDOT touch screen.

Description

TECHNICAL FIELD

[0001] The utility model relates to touch screen technology especially relates to a kind of flexible PEDOT touch screen and curved surface touch module. BACKGROUND

[0002] PEDOT touch screen is a kind of touch screen made of PEDOT (3,4-ethylenedioxythiophene polymer) material.Compared with traditional ITO, nano-silver and metal grid, PEDOT has higher flexibility, which can adapt to the surface of complex shape, which is of great significance to the bending and flexible design commonly seen on modern consumer devices.

[0003] However, PEDOT is extremely sensitive to the environment.Experimental data shows that the sheet resistance of PEDOT increases by 40% within 30 days in a humidity environment with RH>70%;the transmittance decreases by 8.3% after 500 hours of UV irradiation.

[0004] Therefore, it is urgent to improve the packaging structure of PEDOT touch screen to improve the stability of PEDOT touch screen in humid and UV environments. SUMMARY

[0005] To solve the above problems of the prior art, the utility model provides a kind of flexible PEDOT touch screen, which still has higher stability in humid and UV environments.

[0006] The utility model also provides a curved surface touch module, which includes the above flexible PEDOT touch screen.

[0007] The technical problems to be solved by the utility model are solved by the following technical solutions:

[0008] A flexible PEDOT touch screen includes:

[0009] A polymer substrate;

[0010] An Al2O3 / HfO3 superlattice film layer is disposed on the upper surface of the polymer substrate;

[0011] A PEDOT electrode layer is disposed on the upper surface of the Al2O3 / HfO3 superlattice film layer;

[0012] A UV absorption layer is disposed on the upper surface of the PEDOT electrode layer.

[0013] Further, the Al2O3 / HfO3 superlattice film layer includes a plurality of superlattice film layer units that are periodically repeated, and each superlattice film layer unit is composed of five Al2O3 films and one HfO3 film.

[0014] Further, the thickness of the superlattice film layer unit is 3-4nm, the thickness of the Al2O3 film is greater than the thickness of the HfO3 film.

[0015] Further, the thickness of the Al2O3 / HfO3 superlattice film layer is 30-70nm, the thickness of the Al2O3 film is 0.5-0.7nm, and the thickness of the HfO3 film is 0.4-0.6nm.

[0016] Further, the polymer substrate is a self-repairing polyurethane, and the thickness of the self-repairing polyurethane is 1.0-1.2μm.

[0017] Further, the self-repairing polyurethane contains repair microcapsules with a particle size of 200nm, and the repair microcapsules encapsulate vinylpyrrolidone.

[0018] Further, the UV absorption layer is a UV absorption type fluorinated acrylate, and the thickness of the UV absorption layer is 2.5-3.5μm.

[0019] Further, the flexible PEDOT touch screen further comprises a graphene quantum dot layer, and the thickness of the graphene quantum dot layer is 150-250nm; the graphene quantum dot layer is arranged between the PEDOT electrode layer and the UV absorption layer and forms the same electrode pattern as the PEDOT electrode layer.

[0020] Further, the flexible PEDOT touch screen further comprises a diamond-like layer, and the thickness of the diamond-like layer is 80-120nm; the diamond-like layer is arranged on the upper surface of the UV absorption layer.

[0021] A curved touch module comprises a curved cover plate and the flexible PEDOT touch screen, and the flexible PEDOT touch screen is fixed on one side surface of the curved cover plate through OCA optical adhesive.

[0022] The flexible PEDOT touch screen of the utility model has the advantages that when the flexible PEDOT touch screen is touched, the upper surface of the PEDOT electrode layer faces the user, and the lower surface of the PEDOT electrode layer faces away from the user, the UV absorption layer and the Al2O3 / HfO3 superlattice film layer are arranged on the upper surface and the lower surface of the PEDOT electrode layer respectively, the UV absorption layer is used to absorb ambient UV light, the contact between the PEDOT electrode layer and the ambient UV light is reduced, the transmittance of the PEDOT electrode layer in the UV environment is ensured, the Al2O3 / HfO3 superlattice film layer is used to block the ambient moisture that penetrates the polymer substrate, the contact between the ambient moisture and the PEDOT electrode layer is reduced, and the conductivity of the PEDOT electrode layer in the humid environment is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A stacking structure schematic diagram of the flexible PEDOT touch screen is provided.

[0024] Figure 2 A stacking structure schematic diagram of the Al2O3 / HfO3 superlattice film layer in the flexible PEDOT touch screen is provided.

[0025] Figure 3 Another stacking structure schematic diagram of the flexible PEDOT touch screen is provided.

[0026] Figure 4 Another stacking structure schematic diagram of the flexible PEDOT touch screen is provided.

[0027] Figure 5 A stacking structure schematic diagram of the curved touch module is provided. DETAILED DESCRIPTION

[0028] The utility model will be explained in detail below by combining with the drawings and examples, the example of the example is shown in the drawings, wherein the same or similar signs represent the same or similar elements or elements with the same or similar function throughout. The examples described below by referring to the drawings are exemplary, and are intended to explain the utility model, and cannot be understood as limiting the utility model.

[0029] In the description of the utility model, it is understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0030] In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second", "third" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," and "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Example 1

[0033] like Figure 1 As shown, a flexible PEDOT touchscreen includes:

[0034] Polymer substrate 31;

[0035] An Al2O3 / HfO3 superlattice film 32 is disposed on the upper surface of the polymer substrate 31;

[0036] PEDOT electrode layer 33 is disposed on the upper surface of Al2O3 / HfO3 superlattice film layer 32;

[0037] A UV absorption layer 34 is disposed on the upper surface of the PEDOT electrode layer 33.

[0038] In this invention, the flexible PEDOT touchscreen has its upper surface facing the user and its lower surface facing away from the user during touch operation. By depositing a UV absorption layer 34 on the upper surface and an Al2O3 / HfO3 superlattice film layer 32 on the lower surface of the PEDOT electrode layer 33, respectively, the UV absorption layer 34 absorbs ambient UV light, reducing the contact between the PEDOT electrode layer 33 and ambient UV light, thus ensuring the transmittance of the PEDOT electrode layer 33 in a UV environment. Furthermore, the Al2O3 / HfO3 superlattice film layer 32 blocks ambient moisture that passes through the polymer substrate 31, reducing the contact between ambient moisture and the PEDOT electrode layer 33, thereby ensuring the conductivity of the PEDOT electrode layer 33 in a humid environment.

[0039] like Figure 2 As shown, the Al2O3 / HfO3 superlattice film 32 is formed by periodically stacking Al2O3 and HfO3 films. Both Al2O3 and HfO3 films are high dielectric constant films, and both are formed using atomic layer deposition (ALD) technology, achieving a heterostructure density of up to 10. 5 / cm2, and lattice matching is only 0.8%, so that a superlattice structure can be formed, thereby having excellent barrier properties to effectively block environmental moisture from penetrating the polymer substrate 31.

[0040] The Al2O3 / HfO3 superlattice film layer 32 comprises a plurality of superlattice film units 320 periodically repeated, each superlattice film unit 320 being composed of five Al2O3 films and one HfO3 film.

[0041] Preferably, the thickness of the Al2O3 film is greater than that of the HfO3 film, so as to improve stress balance between the two dielectric films and reduce interface defect density between the two dielectric films.

[0042] In this embodiment, the thickness of the Al2O3 / HfO3 superlattice film layer 32 is 30-70 nm, the thickness of the superlattice film unit 320 is 3-4 nm, the thickness of the Al2O3 film is 0.5-0.7 nm, and the thickness of the HfO3 film is 0.4-0.6 nm.

[0043] Preferably, the polymer substrate 31 is a self-repairing polyurethane, and the thickness thereof is 1.0-1.2 μm.

[0044] Using the self-repairing polyurethane as the polymer substrate 31 of the flexible PEDOT touch screen, when the polymer substrate 31 is torn due to large-angle bending (e.g. folding) of the flexible PEDOT touch screen, the self-repairing function of the self-repairing polyurethane layer can repair the tear, thereby ensuring product stability.

[0045] The self-repairing polyurethane contains repair microcapsules with a particle size of 200 nm, and the repair microcapsules encapsulate vinyl pyrrolidone. When the repair microcapsules are damaged due to tearing of the polymer substrate 31, the vinyl pyrrolidone in the repair microcapsules flows out to repair the tear of the polymer substrate 31.

[0046] In this embodiment, the mass fraction of the repair microcapsules in the self-repairing polyurethane is 10-12%.

[0047] Preferably, the UV absorbing layer 34 is a UV absorbing fluorinated acrylate, and the thickness thereof is 2.5-3.5 μm.

[0048] The UV absorbing fluorinated acrylate contains functional groups capable of absorbing UV light, such as benzoyl and hydroxyphenoxy, and is obtained by chemical modification or copolymerization of ordinary fluorinated acrylate and a functional monomer (e.g. 2-acrylic acid 2-(4-benzoyl-3-hydroxyphenoxy) ethyl ester) containing a UV absorbing group.

[0049] In addition, the UV-absorbing fluorinated acrylate is used as the UV-absorbing layer 34, and the fluorinated acrylate has flowability before curing, so that the flowability can be used to fill the uneven surface formed in the electrode patterning of the PEDOT electrode layer 33 (i.e., the electrode area and the non-electrode area of the PEDOT electrode layer 33 are simultaneously covered to fill the height difference between the electrode area and the non-electrode area), so as to facilitate the arrangement of other film layers or the adhesion with the curved cover plate.

[0050] Preferably, as shown in Figure 3 The flexible PEDOT touch screen further comprises a graphene quantum dot layer 35 with a thickness of 150-250 nm, which is arranged between the PEDOT electrode layer 33 and the UV-absorbing layer 34 and forms the same electrode pattern as the PEDOT electrode layer 33.

[0051] The graphene quantum dot layer 35 can form a composite film layer with the PEDOT electrode layer 33 to improve the electron mobility of the PEDOT electrode layer 33, thereby optimizing the electrical performance of the PEDOT electrode layer 33 and improving the touch response speed.

[0052] Preferably, as shown in Figure 4 The flexible PEDOT touch screen further comprises a diamond-like layer 36 with a thickness of 80-120 nm, which is arranged on the upper surface of the UV-absorbing layer 34.

[0053] The diamond-like layer 36 has high hardness, which can improve the hardness of the upper surface of the flexible PEDOT touch screen to protect the upper surface of the flexible PEDOT touch screen from being scratched by hard objects before being adhered to the curved cover plate.

[0054] Embodiment Two

[0055] As shown in Figure 5 A curved touch module comprises a curved cover plate 1 and the flexible PEDOT touch screen 3 of the above embodiment, and the curved cover plate 1 is adhered to the upper surface of the flexible PEDOT touch screen 3 through an OCA optical adhesive 2.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, but not to limit them. Although the embodiments of the present application have been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the present application can still be modified or replaced by equivalents, and these modifications or replacements cannot make the modified technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A flexible PEDOT touch screen, characterized by, The flexible PEDOT touch screen comprises: a polymer substrate; an Al2O3 / HfO3 superlattice film layer arranged on the upper surface of the polymer substrate; a PEDOT electrode layer arranged on the upper surface of the Al2O3 / HfO3 superlattice film layer; a UV absorption layer arranged on the upper surface of the PEDOT electrode layer.

2. The flexible PEDOT touch screen according to claim 1, wherein, The Al2O3 / HfO3 superlattice film layer comprises a plurality of superlattice film layer units arranged in a periodic repetition, each superlattice film layer unit being composed of five Al2O3 films and one HfO3 film.

3. The flexible PEDOT touch screen according to claim 2, wherein, The thickness of the Al2O3 film is greater than the thickness of the HfO3 film.

4. The flexible PEDOT touch screen according to claim 3, wherein, The thickness of the Al2O3 / HfO3 superlattice film layer is 30-70 nm, the thickness of the superlattice film layer unit is 3-4 nm, the thickness of the Al2O3 film is 0.5-0.7 nm, and the thickness of the HfO3 film is 0.4-0.6 nm.

5. The flexible PEDOT touch screen of claim 1, wherein, The polymer substrate is a self-repairing polyurethane, and the thickness of the self-repairing polyurethane is 1.0-1.2 μm.

6. The flexible PEDOT touch screen according to claim 5, wherein, The self-repairing polyurethane contains repair microcapsules with a particle size of 200 nm, and the repair microcapsules encapsulate vinyl pyrrolidone.

7. The flexible PEDOT touch screen of claim 1, wherein, The UV absorption layer is a UV absorption type fluorinated acrylate, and the thickness of the UV absorption layer is 2.5-3.5 μm.

8. The flexible PEDOT touch screen of claim 1, wherein, The flexible PEDOT touch screen further comprises a graphene quantum dot layer with a thickness of 150-250 nm; the graphene quantum dot layer is arranged between the PEDOT electrode layer and the UV absorption layer and forms the same electrode pattern as the PEDOT electrode layer.

9. The flexible PEDOT touch screen of claim 1, wherein, The flexible PEDOT touch screen further comprises a diamond-like carbon layer with a thickness of 80-120 nm; the diamond-like carbon layer is arranged on the upper surface of the UV absorption layer.

10. A curved touch module, characterized in that, The flexible PEDOT touch screen is fixed on one side surface of the curved cover plate by OCA optical adhesive.

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