JP2013016313A - Foldable transparent conductive layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transparent conductive film which is folded at predetermined positions.SOLUTION: A transparent conductive film is formed by a conductive material and has folded parts, each of which is formed by a line of holes provided on a surface of the transparent conductive film so as to form a perforation shape and may be folded along the line of the holes. The folded part may be formed by a line of holes including through holes penetrating from the surface to a rear surface of the transparent conductive film. Alternatively, the folded part may be formed by a line of the holes including bottomed holes which does not penetrate from the surface to the rear surface of the transparent conductive film.

Description

  The present invention relates to a transparent conductive layer that can be bent at a predetermined location. Specifically, the present invention relates to a transparent conductive layer that can be used at touch panels, liquid crystals, solar cells, electronic paper, and the like and can be bent at a predetermined position.

  Usually, a transparent conductive film made of ITO (indium tin oxide) is used for touch panels, liquid crystals, and the like. Although this transparent conductive film made of ITO has good properties as transparency and conductivity, it is weak against mechanical loads such as bending, and has defects such as cracking and a significant increase in electrical resistance.

  Since the touch panel includes a portion drawn from the transparent conductive film in the periphery of the screen, the entire screen cannot actually be used as the touch panel. In order to provide this routing portion on the side surface side of the touch panel, it is necessary to bend or fold the touch panel on the side surface. However, as described above, the transparent conductive film made of ITO is weak against mechanical loads such as bending, and cannot be bent or bent.

  In addition, in a touch panel configured by providing a transparent film on an insulating substrate, it has been proposed to bend the insulating substrate and the film with a rounded shape (see, for example, cited document 1). In addition, there is a proposal for a narrow frame-compatible touch panel in which a touch panel is formed into a three-dimensional shape having a front surface and a side surface, and an electrode and a lead circuit that connects the electrode to an outside extraction portion are formed on the side surface (for example, a patent Reference 2).

JP 2004-54050 A JP 2010-146418 A

  However, in the above-mentioned Patent Document 1, the bent portion is not rounded but rounded so as to have a certain degree of curvature. In this case, the touch panel cannot be bent at a right angle. Further, in the above cited document 2, an electrode and a lead circuit that connects the electrode to an outside extraction portion are formed on the side surface of the three-dimensional substrate instead of being bent. That is, in the cited document 2, the touch panel is not folded, but only when electrodes or the like can be formed on the side surface of the three-dimensional substrate.

  Then, the objective of this invention is providing the transparent conductive film which can be bent in a predetermined location about the transparent conductive film which can be utilized for a touch panel etc.

The transparent conductive film according to the present invention is a transparent conductive film composed of a conductive material,
It comprises a row of holes provided in a perforated shape on the surface, and has a foldable portion that can be bent along the row of holes.

  Moreover, the said bending part may be comprised by the row | line | column of the hole containing the through-hole penetrated from the surface to the back surface of the said transparent conductive film.

  Further, the bent portion may be constituted by a row of holes including a bottomed hole that does not penetrate from the front surface to the back surface of the transparent conductive film.

  The conductive material may be selected from the group consisting of conductive nanowire materials, carbon nanowires, conductive mesh materials, and conductive polymer materials.

  The transparent conductive film according to the present invention is formed using a conductive material and has a bent portion formed of a row of holes provided in a perforated shape on the surface, and can be bent along the row of holes in the bent portion. It is.

2 is a plan view of a transparent conductive film according to Embodiment 1. FIG. It is sectional drawing which shows the cross-sectional structure along the AA line in case the hole provided in the perforated form on the surface of the transparent conductive film of FIG. 1 is a through-hole. It is sectional drawing which shows the cross-sectional structure along the AA line in case the hole provided in the perforated shape on the surface of the transparent conductive film of FIG. 1 is a bottomed hole. It is sectional drawing which shows the state which bent the transparent conductive film of FIG. 1 in the bending part. 6 is a plan view of a modification of the transparent conductive film according to Embodiment 1. FIG. It is a graph which shows the relationship between the frequency | count of bending of a 8 mm (phi) mandrel bending test test result, and resistance value change rate about the transparent conductive film (♦) which consists of ITO, and the transparent conductive film (■) which consists of silver nanowires.

  Hereinafter, a foldable transparent conductive film according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the drawings, substantially the same members are denoted by the same reference numerals.

(Embodiment 1)
FIG. 1 is a plan view of a transparent conductive film 10 according to the first embodiment. FIG. 2 is a cross-sectional view showing a cross-sectional structure along the line AA when the hole provided in the perforated shape on the surface of the transparent conductive film 10 of FIG. FIG. 3 is a cross-sectional view showing a cross-sectional structure along the line AA when the holes provided in the perforated shape on the surface of the transparent conductive film 10 of FIG. FIG. 4 is a cross-sectional view showing a state where the transparent conductive film of FIG. 1 is bent at a bent portion.
The transparent conductive film 10 according to the first embodiment is configured by the conductive nanowire material 3, is configured by a row of holes provided on the surface in a perforated manner, and has a bent portion that can be bent along the row of holes. . Therefore, the transparent conductive film 10 can be bent along the row of holes in the bent portion.

In the transparent conductive film 10 according to the first embodiment, a conductive material having a small resistance value change with respect to a bending load is used as a material constituting the transparent conductive film 10.
FIG. 6 is a graph showing the relationship between the number of bendings and the resistance value change rate in the 8 mmφ mandrel bending test results for the transparent conductive film (♦) made of ITO and the transparent conductive film (■) made of silver nanowires. . As shown in FIG. 6, the commonly used transparent conductive film made of ITO (Indium Tin Oxide) material is weak against mechanical load such as bending, and its resistance value greatly changes even with slight bending. To do. On the other hand, as shown in the test result of 8 mmφ mandrel bending test in FIG. 6, the transparent conductive film made of the silver nanowire material which is one of the conductive nanowire materials has almost no change in the resistance value even after being bent more than 10 times. It has sufficient bending resistance. Therefore, in the transparent conductive film made of this silver nanowire material, there is almost no change in resistivity even when it is bent, so that it can be bent at a predetermined location.

  The transparent conductive film 10 is composed of a row of holes provided on the surface in a perforated manner, and has a bent portion that can be bent along the row of holes. The perforated holes may be through holes 4 penetrating from the front surface to the back surface as shown in FIG. 2, or bottomed holes not penetrating from the front surface to the back surface as shown in FIG. 6 may be sufficient. Moreover, it is preferable that this row | line | column of a hole is provided in linear form, However, Curve shape may be sufficient. In addition, the hole diameter of each hole which comprises the row | line | column of a hole, and the space | interval of a hole are not restrict | limited in particular. If the diameter of the hole becomes too large, the lead-out part becomes large and the display part becomes small. Therefore, the hole diameter is preferably 1 mm or less. Moreover, since the bending effect will become small if the diameter of a hole is too small, 50 micrometers or more are preferable. Furthermore, since the bending effect will become small if the space | interval of a hole is too large, 20 mm or less is preferable. Moreover, when the space | interval of a hole becomes narrow, 100 micrometers or more are preferable. Further, in the plan view of FIG. 1, two rows of holes are provided. However, the present invention is not limited to this, and as shown in the plan view of FIG. 5, there may be one row of holes or three or more rows. Good.

Below, each structural member which comprises this transparent conductive film 10 is demonstrated.
<Transparent conductive film>
The conductive material constituting the transparent conductive film 10 can be selected from the group consisting of conductive nanowire materials, carbon nanowires, conductive mesh materials, and conductive polymer materials.

<Conductive nanowire material>
As the conductive nanowire material, for example, silver, gold, copper, nickel, gold-plated silver, aluminum, or the like can be used. Note that the conductive nanowire material 3 is not limited to the above example. As the conductive nanowire material, silver nanowire is particularly preferable. Further, as shown in the 8 mmφ mandrel bending test result of FIG. 6, the transparent conductive film (■) made of a silver nanowire material, which is one of the conductive nanowire materials, has a resistance value even after being bent more than 10 times. It has sufficient bending resistance so that there is almost no change.

  There are proposals (Japanese Patent Application Laid-Open No. 2010-244747, Japanese Translation of PCT International Publication No. 2009-505358) that use a conductive nanowire material as a transparent conductive material.

<Carbon nanowire>
As the carbon nanowire, for example, a carbon nanotube can be used.

<Conductive mesh material>
As the conductive mesh material, for example, a copper mesh, an aluminum mesh or the like can be used. Note that the conductive mesh material is not limited to the above, and may be used in combination.

<Conductive polymer material>
As the conductive polymer material, for example, PEDOT (polyethylene dioxythiophene), PSS (polystyrene sulfonic acid), or the like can be used. Note that the conductive polymer material is not limited to these, and may be used in combination.

<Manufacturing method>
This transparent conductive film 10 is obtained as follows, for example.
a) A conductive film made of silver nanowires is formed as a conductive nanowire material.
b) A row of perforated through holes is formed on the surface of the conductive film made of silver nanowires by, for example, laser light irradiation. When the bottomed hole 6 is formed instead of the through hole 4, the bottomed hole 6 may be formed from the surface by a compressor or the like.
As described above, the transparent conductive film 10 made of silver nanowires and configured with a row of perforated through holes 4 on the surface and having a bent portion 2 that can be bent along the row of holes is obtained.

  The transparent conductive film that can be bent at a predetermined location according to the present invention is useful as a transparent conductive film for touch panels, liquid crystals, solar cells, electronic paper, and the like.

2 Folded part (row array)
4 Through-hole 6 Bottomed hole 10, 10a Transparent conductive film

Claims (4)

A transparent conductive film composed of a conductive material,
A transparent conductive film comprising a row of holes provided on the surface in a perforated manner and having a bent portion that can be bent along the row of holes.   2. The transparent conductive film according to claim 1, wherein the bent portion includes a row of holes including through holes penetrating from the front surface to the back surface of the transparent conductive film.   2. The transparent conductive film according to claim 1, wherein the bent portion includes a row of holes including a bottomed hole that does not penetrate from the front surface to the back surface of the transparent conductive film.   4. The transparent conductive film according to claim 1, wherein the conductive material is selected from the group consisting of a conductive nanowire material, a carbon nanowire, a conductive mesh material, and a conductive polymer material. 5.

Images