CN111627595A - Lead, preparation method of lead and flexible display device - Google Patents
Lead, preparation method of lead and flexible display device Download PDFInfo
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- CN111627595A CN111627595A CN201910153585.3A CN201910153585A CN111627595A CN 111627595 A CN111627595 A CN 111627595A CN 201910153585 A CN201910153585 A CN 201910153585A CN 111627595 A CN111627595 A CN 111627595A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/14—Non-insulated conductors or conductive bodies characterised by their form comprising conductive layers or films on insulating-supports
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0026—Apparatus for manufacturing conducting or semi-conducting layers, e.g. deposition of metal
Abstract
The invention relates to the technical field of flexible display, and discloses a lead, a preparation method of the lead and a flexible display device. The wire has a first curved shape continuous on a first plane and a second curved shape continuous on a second plane, and both the first curved shape and the second curved shape can be deformed under the stretching action of an external force. That is, by bending on different planes, it is possible to lay out longer wires in a limited layout space, satisfying better tensile properties.
Description
Technical Field
The invention relates to the technical field of flexible display, in particular to a lead, a preparation method of the lead and a flexible display device.
Background
With the development of display technology, the advantages of flexible display are increasingly prominent, and because of the advantages of being light, thin, bendable, and convenient to carry, the flexible display is more and more widely applied to the display fields of mobile phones, notebook computers, electronic books, and the like, and becomes an important direction for the development of the current display technology.
To accommodate different shape applications, flexible display devices are also required to have certain stretching properties, which are traditionally achieved by connecting the individual display devices together by means of bendable wires. However, as the integration density of the display device increases, the layout space of the bent conductive lines is greatly limited, which results in a great reduction in the stretchability of the display device.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is that the flexible display device in the prior art has poor stretching performance.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the embodiment of the invention provides a lead, which is provided with a first bent shape continuously extending on a first plane and a second bent shape continuously extending on a second plane, wherein both the first bent shape and the second bent shape can be deformed under the stretching action of an external force.
Optionally, the first plane intersects the second plane.
Optionally, an included angle between the first plane and the second plane is 60 ° to 90 °.
Optionally, the first curved shape is S-shaped or U-shaped or Z-shaped or M-shaped or N-shaped.
Optionally, the second curved shape is a concave-convex shape.
Optionally, the conductive line includes a conductive material layer and an elastic material layer covering at least one side of the conductive material layer.
Optionally, the conductive material layer material is selected from any one of metal, metal alloy, carbon nanotube, graphene and silver nanowire,
and/or the elastic material layer is made of any one of polydimethylsiloxane, silica gel, silicone, polyimide, polyurethane and fluororubber.
According to a second aspect, an embodiment of the present invention provides a method for manufacturing a conductive wire, including the following steps: coating a photoresist material on a substrate; exposing and developing the photoresist material to form a first curved shape continuous on a first plane and a second curved shape continuous on a second plane; forming a layer of conductive material on the developed photoresist material, wherein the layer of conductive material has a continuous first curved shape in a first plane and a continuous second curved shape in a second plane; forming an elastic material layer on the conductive material layer; and removing the photoresist material.
Optionally, the exposing and developing the photoresist material to form a first curved shape continuous in a first plane direction and a second curved shape continuous in a second plane includes: and exposing and developing the photoresist material on the first plane to obtain a plurality of developed patterns, wherein the developed patterns are arranged on the first plane to form a first continuously extending curved shape, and are arranged on the second plane to form a second continuously extending curved shape.
Optionally, after the second curved shape is formed, the method further includes baking the photoresist material to make the second curved shape have a smooth surface.
The embodiment of the invention also provides a flexible display device which comprises the lead or the lead prepared by the method.
The technical scheme of the invention has the following advantages:
the wire provided by the embodiment of the invention has a continuous first bent shape on the first plane and a continuous second bent shape on the second plane, and both the first bent shape and the second bent shape can be deformed under the stretching action of external force. That is, by bending on different planes, it is possible to lay out longer wires in a limited layout space, satisfying better tensile properties.
Further, in the lead provided by the embodiment of the invention, the first plane is intersected with the second plane, and further, an included angle between the first plane and the second plane is 60-90 degrees, so that a longer lead can be laid in more dimensional space, and the occupation of a two-dimensional plane is reduced.
Further, in the conductive wire provided by the embodiment of the present invention, the first bending shape is S-shaped, U-shaped, Z-shaped, M-shaped, or N-shaped. Namely, the first bending shape can be set according to actual requirements, and selectivity and flexibility are strong.
Further, in the conductive wire according to the embodiment of the present invention, the conductive wire includes a conductive material layer and an elastic material layer covering at least one side of the conductive material layer. Therefore, the elastic material layer is arranged, so that the wire has good elasticity and is convenient to stretch.
The method for preparing the lead provided by the embodiment of the invention is to form the conductive material layer on the formed first bent shape and the second bent shape, so that the conductive material layer has the first bent shape on the first plane and the second bent shape on the second plane at the same time, and the preparation method is simple and easy to implement. The lead prepared by the preparation method can be bent on the first plane and also can be bent on the second plane, and even if the layout space of the lead is limited in practical application, a longer lead can be laid to meet the better tensile property of the lead. In addition, through the arrangement of the elastic material layer, the wire has good elasticity and is convenient to stretch.
Further, the method for manufacturing a conductive line according to the embodiment of the present invention further includes a step of baking the photoresist material after the second curved shape is formed. The surface of the second curved shape can be smooth through the baking process, so that the subsequent conductive material layer can be formed continuously and is not easy to break.
The flexible display device provided by the embodiment of the invention comprises the lead. The connection between adjacent display devices can be realized through the wires, and because the wires have the bending shapes on different planes, the occupation of two-dimensional space of the flexible display device with high integration can be reduced, longer wires can be arranged in the limited wire layout space, and the tensile property of the flexible display device is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a conductive line according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for fabricating a conductive line according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for fabricating a conductive line according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method for fabricating a conductive line according to an embodiment of the present invention;
reference numerals:
1-a first curved shape; 2-a second curved shape; 3-a substrate; 4-a photoresist material; 5-a layer of conductive material; 6-elastic material layer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the invention provides a lead, as shown in fig. 1, which has a first curved shape 1 continuously extending on a first plane and a second curved shape 2 continuously extending on a second plane, wherein both the first curved shape 1 and the second curved shape 2 can be deformed under the stretching action of an external force. The second curved shape 2 shown in the figure is a shape of a local area in the first curved shape 1 on a second plane. The first curved shape 1 is formed on the basis of the second curved shape 2, or the second curved shape 2 is formed on the basis of the first curved shape 1. Preferably, in this embodiment, the first plane and the second plane are different planes.
The lead provided by the embodiment can be bent on different planes, namely, a long lead can be laid in a limited layout space, and the better tensile property of the lead is met.
As an optional implementation manner, in this embodiment, the first plane is a plane in which the length direction of the conductive wire is located, and the second plane is a plane in which the thickness direction of the conductive wire is located.
As an optional implementation, the first plane intersects the second plane, and in a practical application process, an included angle between the first plane and the second plane may slightly change, and as an optional implementation, the included angle between the first plane and the second plane is 60 ° to 90 °, so that the conducting wires are arranged in a more multidimensional space, and occupation of the two-dimensional plane is reduced.
Preferably, the first plane is perpendicular to the second plane, that is, the first plane is a plane in which the length direction of the conductive wire is located, and the second plane is a plane in which the thickness direction of the conductive wire is located. The plane in which the length direction of the wire is located is assumed to be a horizontal plane, i.e., the first plane is a horizontal plane, and the second plane is perpendicular to the first plane, and with reference to fig. 1, the wire has a continuous first curved shape 1 on the horizontal plane (i.e., the first curved shape 1 is located on the horizontal plane in fig. 1, and the first curved shape is partially represented as a top view of the wire in fig. 1), and also has a continuous second curved shape 2 on a vertical plane perpendicular to the horizontal plane (i.e., the second curved shape 2 is located on the vertical plane in fig. 1, and the second curved shape is partially represented as a side view of the wire in fig. 1), so that the wire is bent in different dimensions in a three-dimensional space, and the occupation of the two-dimensional plane is further reduced. In practical application, the tensile property of the wire is improved when high integration of the device is satisfied. Meanwhile, the manufacturing process is simple and easy to realize.
As an alternative embodiment, in the present embodiment, the first curved shape 1 is a shape that can be arbitrarily stretched, such as an S-shape, a U-shape, a Z-shape, an M-shape, or an N-shape. That is, the first curved shape 1 can be set according to actual requirements, and selectivity and flexibility are strong. Preferably, the first curved shape 1 is S-shaped or N-shaped, which can better improve the extension capability of the wires in the first plane, thereby improving the stretchability of the wires, and can arrange more longer wires in a limited space, thereby meeting the requirement of high integration of the device.
As an alternative, in this embodiment, the second curved shape 2 is a concave-convex shape. The cross section of the convex part in the second curved shape 2 in the thickness direction of the wire may be an arc shape, or a rectangle, a trapezoid, a triangle, or the like. Preferably, in this embodiment, in order to improve the performance of the wire, the second curved shape 2 may have a smooth surface, and there is no sharp corner as much as possible.
As an alternative, in this embodiment, the conductive line includes a conductive material layer 5 and an elastic material layer 6 covering at least one side of the conductive material layer 5. The elastic material layer 6 may be disposed on one side of the conductive material layer 5 for adhering and fixing the wires, or disposed on two sides or three sides or four sides thereof, for example, preferably, the elastic material layer 6 may completely wrap the conductive material layer 5. Through the arrangement of the elastic material layer 6, the wire has good elasticity and is convenient to stretch.
As an alternative embodiment, in the present embodiment, the material of the conductive material layer 5 is selected from any one of a metal, a metal alloy, a carbon nanotube, graphene, and a silver nanowire. Preferably, the material of the conductive material layer 5 is selected from metal or silver nanowires or graphene, has good conductivity, can meet the requirement of tensile property and the requirement of conductivity, and is suitable for scenes with high requirements on conductivity.
As an alternative embodiment, in the present embodiment, the material of the elastic material layer 6 is selected from any one of polydimethylsiloxane, silicone, polyimide, polyurethane and fluororubber. Preferably, the material of the elastic material layer 6 is selected from polydimethylsiloxane or silicone or polyimide, which can make the lead have better tensile property.
As an optional implementation manner, in this embodiment, the conductive material layer 5 is made of graphene with higher toughness, and the elastic material layer 6 is made of polyimide with higher adhesion, higher elasticity and higher toughness, and the bonding force between the graphene and the polyimide is better, so that the lead can be more effectively prevented from being broken and separated when being bent.
As an optional implementation manner, in this embodiment, the conductive material layer 5 is made of nano silver or metal (e.g., aluminum or copper), since the nano silver material has low impedance, the conductivity of the conductive wire can be improved, and the elastic material layer 6 is made of self-polydimethylsiloxane with good binding property with the metal, which can improve the conductivity of the conductive wire and reduce the probability of separation between the conductive wire and the elastic material.
The embodiment of the invention also provides a preparation method of the lead, and with reference to fig. 2 to 4, the preparation method comprises the following steps:
step S11 is to coat the substrate 3 with the photoresist material 4. The substrate 3 is a rigid substrate, and is generally a glass substrate, and the photoresist 4 is generally a photoresist.
Step S12, the photo-resist material 4 is exposed and developed to form a first curved shape 1 continuous on the first plane and a second curved shape 2 continuous on the second plane (see fig. 2). The first plane is parallel to the substrate 3, and the first curved shape 1 may be any stretchable shape such as an S-shape, U-shape, Z-shape, M-shape, or N-shape. The second plane is a direction perpendicular to the substrate 3, and the second curved shape 2 may be a concave-convex shape. I.e., a photoresist having a concave-convex shape formed in a direction perpendicular to the substrate 3.
The cross section of the convex portion of the concavo-convex shape may be trapezoidal or rectangular or triangular, and when trapezoidal or triangular, it may be realized by repeating exposure. Namely, exposure windows with different sizes are arranged, multiple times of exposure are carried out, the gradient angle of exposure is adjusted, and a trapezoidal or triangular convex shape is formed.
In step S12, a mask plate with a hollowed-out shape of S-shape, U-shape, Z-shape, M-shape, or N-shape is used, wherein a plurality of light-shielding regions are arranged at intervals inside the S-shape, U-shape, Z-shape, M-shape, or N-shape.
Specifically, the method for forming the first curved shape and the second curved shape may be to expose and develop the photoresist material on the first plane to obtain a plurality of developed patterns, where the developed patterns are arranged on the first plane to form a first curved shape extending continuously, and arranged on the second plane to form a second curved shape extending continuously. Before exposure, the photoresist material may be exposed according to the first curved shape, and specifically, the photoresist may be exposed by using a mask having a light leakage or shielding portion with the first curved shape. To form a first curved shape on a first plane, the developed pattern within the first curved shape may be intermittently discontinuous protrusions to constitute a second curved shape in a second plane. In particular, reference may be made to the relationship of the first curved shape to the second curved shape as shown in fig. 4.
Step S13, forming a conductive material layer 5 having a continuous first curved shape 1 on a first plane and a continuous second curved shape 2 on a second plane on the developed photoresist 4 (see fig. 4). Specifically, in this embodiment, the conductive material layer 5 may be evaporated in the formed first curved shape 1 and the second curved shape 2 by combining with a fine metal mask plate with a hollow shape of S-shape, U-shape, Z-shape, M-shape, or N-shape and an evaporation process, so that the conductive material layer 5 has the first curved shape 1 continuous on the first plane and the second curved shape 2 continuous on the second plane. The second curved shape 2 shown in fig. 4 is a shape of a local area in the first curved shape 1 on the second plane.
In this embodiment, the material of the conductive material layer 5 is selected from any one of metal, metal alloy, carbon nanotube, graphene and silver nanowire.
Step S14 is to form the elastic material layer 6 on the conductive material layer 5 (see fig. 4). The layer of elastomeric material 6 is typically cast over the layer of conductive material 5 using a casting process. In this embodiment, the material of the elastic material layer 6 is selected from any one of polydimethylsiloxane, silicone, polyimide, polyurethane and fluororubber. In this embodiment, the wire material can adopt the graphite alkene that has higher toughness to and elastic material can adopt the polyimide that has higher adhesion, higher elasticity and higher toughness, and, graphite alkene is better with polyimide's cohesion, can be comparatively effectual prevent that the wire from splitting and separating when buckling. In addition, nano silver or metal (such as aluminum or copper) materials can be used as the lead materials, the nano silver materials have low impedance, so that the conductivity of the lead can be improved, the elastic materials can be selected from polydimethylsiloxane with good bonding property with the metal, the conductivity of the lead can be improved, and the probability of separation of the lead and the elastic materials can be reduced.
After the elastomeric layer 6 is formed, it is also subjected to a curing process.
Step S15, the photoresist 4 is removed.
As an alternative, in this embodiment, in step S12, the step of forming the second curved shape 2 further includes a step of baking the photoresist 4 (see fig. 3). This is because, after the formation of the concave-convex shape by the exposure development process, the concave-convex shape does not have a smooth surface, which is not favorable for the subsequent formation of the conductive material layer 5. Therefore, the conductive material layer is baked through a baking process, so that the corners of the rectangle or the trapezoid disappear and become round corners with smooth transition, the continuity of the conductive material layer 5 is facilitated, and the conductive material layer is not easy to break.
The preparation method provided by the embodiment of the invention is to form the conductive material layer 5 on the formed first curved shape 1 and the second curved shape 2, so that the conductive material layer 5 has the first curved shape 1 on the first plane and the second curved shape 2 on the second plane at the same time, and the preparation method is simple and easy to implement. The lead prepared by the preparation method can be bent on the first plane and also can be bent on the second plane, and even if the layout space of the lead is limited in practical application, a longer lead can be laid to meet the better tensile property of the lead. In addition, through the arrangement of the elastic material layer 6, the wire has good elasticity and is convenient to stretch.
The embodiment of the invention also provides a flexible display device which comprises the lead. The connection between adjacent display devices can be realized through the wires, and the wires have the bending shapes in different directions, so that the occupation of two-dimensional space of the flexible display device with high integration can be reduced, longer wires can be arranged in the limited wire layout space, and the tensile property of the flexible display device is improved.
The flexible display device can be a mobile phone, a PC, a tablet personal computer, a vehicle-mounted display screen and the like.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A wire having a first curved shape (1) extending continuously in a first plane and a second curved shape (2) extending continuously in a second plane, the first curved shape (1) and the second curved shape (2) being deformable under tension by an external force.
2. The lead of claim 1, wherein the first plane intersects the second plane; preferably, the included angle between the first plane and the second plane is 60-90 degrees.
3. The wire according to claim 1 or 2, wherein the first curved shape (1) is S-shaped or U-shaped or Z-shaped or M-shaped or N-shaped.
4. The wire according to any one of claims 1 to 3, wherein the second curved shape (2) is a concavo-convex shape.
5. The wire according to any of claims 1 to 4, characterized in that it comprises a layer (5) of conductive material and a layer (6) of elastic material covering at least one side of said layer (5) of conductive material.
6. The method for manufacturing a conductive wire according to claim 5, wherein the conductive material layer (5) is made of any one material selected from the group consisting of a metal, a metal alloy, a carbon nanotube, graphene, and a silver nanowire,
and/or the material of the elastic material layer (6) is selected from any one of polydimethylsiloxane, silica gel, silicone, polyimide, polyurethane and fluororubber.
7. A method for preparing a lead is characterized by comprising the following steps:
coating a substrate (3) with a photoresist material (4);
exposing and developing the photoresist material (4) to form a first curved shape (1) continuous on a first plane and a second curved shape (2) continuous on a second plane;
forming a layer of conductive material (5) on the developed photoresist (4), wherein the layer of conductive material (5) has a continuous first curved shape (1) in a first plane and a continuous second curved shape (2) in a second plane;
-forming a layer of elastic material (6) on said layer of conductive material (5);
and removing the photoresist material (4).
8. The method of claim 7, wherein exposing and developing the photoresist (4) to form a first curved shape (1) continuous in a first plane and a second curved shape (2) continuous in a second plane comprises:
and exposing and developing the photoresist material (4) on the first plane to obtain a plurality of developing patterns, wherein the developing patterns are arranged on the first plane to form a first continuously extending curved shape (1), and are arranged on the second plane to form a second continuously extending curved shape (2).
9. The method for manufacturing a conductive wire according to claim 7 or 8, further comprising a step of baking the photoresist (4) after forming the second curved shape (2) so that the second curved shape (2) has a smooth surface.
10. A flexible display device comprising a conductor according to any one of claims 1 to 6 or a conductor prepared by a method according to any one of claims 7 to 9.
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| CN201910153585.3A CN111627595B (en) | 2019-02-28 | 2019-02-28 | Lead, preparation method of lead and flexible display device |
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| CN201910153585.3A CN111627595B (en) | 2019-02-28 | 2019-02-28 | Lead, preparation method of lead and flexible display device |
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