JP5734763B2 - Compound input device - Google Patents

Description

  The present invention relates to a composite input device including a solar cell and a touch panel provided on a light receiving surface thereof.

  For solar cell members, improvement of photoelectric conversion efficiency is an important issue. For this purpose, a structure called “texture structure” consisting of an uneven surface structure is provided to increase the film thickness of the photoelectric conversion layer. The method of increasing the amount of light absorbed in the photoelectric conversion layer by increasing the optical path length of the light passing through the photoelectric conversion layer by scattering the light by "" is used.

  However, when a photoelectric conversion layer (semiconductor layer) is formed on the texture structure, many defects may be induced in the photoelectric conversion layer to deteriorate the conversion efficiency, or the film thickness of the photoelectric conversion layer is increased. There are problems such as an increase in material cost and a decrease in production speed. In solar cells, there is a proposal to convert incident light into scattered light in order to improve conversion efficiency and eliminate incident angle dependency (see, for example, Patent Documents 1 and 2).

  On the other hand, some proposals have been made on device technology combining a solar cell and a transparent touch panel (see, for example, Patent Documents 3 to 6). Thus, according to the device which combined the solar cell and the touch panel, for example, when used as a remote controller, there is an advantage that a primary battery is not required.

JP 2011-40525 A JP 2010-56532 A Japanese Utility Model Publication No. 61-189352 JP 2003-167233 A JP 2004-102777 A JP 2006-228196 A

  However, as shown in the plan view of the conventional touch panel in FIG. 8, the lead wiring portion 22 exists in the touch panel. A silver paste or the like is used for the routing wiring portion 22. Therefore, as shown in FIG. 9, when the conventional touch panel 2 is disposed on the solar cell 1, the light transmittance of the routing wiring portion 22 is low and does not function as an effective light receiving surface. As a result, there is a problem that sufficient power generation efficiency cannot be obtained for the area of the routing wiring portion 22.

  On the other hand, the ITO material normally used as the transparent conductive film of the touch panel is vulnerable to bending, and the resistance value changes greatly even with slight bending. Therefore, there is a problem that it is difficult to arrange the routing wiring portion 22 on the side surface.

  Accordingly, an object of the present invention is to prevent a decrease in light transmittance due to the routing wiring portion in a composite input device provided with a touch panel on a solar cell, to ensure sufficient light reaching the solar cell, and An object of the present invention is to provide a composite input device that improves conversion efficiency and has a function as a touch panel.

A composite input device according to the present invention includes a solar cell unit capable of receiving and generating electric power at a light receiving surface;
A touch panel unit provided on the light receiving surface of the solar cell unit and having a transparent conductive film;
Provided on a side surface of the solar cell portion with respect to the light receiving surface, and a lead wiring portion connected to the transparent conductive film,
With
The transparent conductive film and the routing wiring portion are electrically connected by a bent portion that is made of a conductive nanowire material and can be bent from the light receiving surface to the side surface.

  Further, the routing wiring portion may be provided with a reflective material that reflects light on a surface in contact with the side surface of the solar cell.

  Furthermore, the transparent conductive film may be made of a conductive nanowire material. Furthermore, the transparent conductive film may be made of ITO.

A wireless communication unit for performing wireless communication with the outside;
A battery for storing electric power generated by the solar cell;
May be further provided.

  The composite input device according to the present invention includes a lead wiring portion electrically connected to the side surface of the solar cell portion via a transparent conductive film of the touch panel portion and a bent portion. The bent portion is made of a conductive nanowire material, whereby the lead wiring portion of the touch panel portion can be provided not on the light receiving surface of the solar cell portion but on the side surface of the solar cell portion. Therefore, the light receiving surface of the solar cell unit can be utilized to the maximum, and the power generation efficiency can be improved.

1 is a schematic cross-sectional view showing a cross-sectional structure of a composite input device 10 according to Embodiment 1. FIG. It is a fragmentary sectional view which shows the cross-section of the connection part of the lead wiring part of FIG. 1, especially the edge part, and the transparent conductive film of a touchscreen part. It is the schematic which shows the structure of electroconductive nanowire material. 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. It is a conceptual diagram which arrange | positions the routing wiring part connected with the transparent conductive film of the touchscreen part of the composite input device which concerns on Embodiment 1 on a side surface of a solar cell part by bend | folding with a fold line. FIG. 3 is a perspective view showing a lead wiring portion of the composite input device according to the first embodiment. (A) is a schematic sectional drawing which shows the process of bend | folding the routing wiring part of FIG. 5 with a fold line, and arrange | positioning on the side surface of a solar cell part, (b) is a cross section of the composite input device obtained by (a) It is a schematic sectional drawing which shows a structure. It is a top view which shows the routing wiring part of the conventional touch panel. It is sectional drawing which shows the cross-sectional structure at the time of providing the touch panel of FIG. 8 on a solar cell. 1 is a plan view of a composite input device according to Embodiment 1. FIG. 6 is a block diagram illustrating a configuration of a composite input device according to Embodiment 2. FIG.

  A composite input device according to an embodiment of the present invention will be described below 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 schematic cross-sectional view showing a cross-sectional structure of the composite input device 10 according to the first embodiment. FIG. 2 is a partial cross-sectional view showing a cross-sectional structure of a connection portion between the lead wiring portion 22 at the end portion of FIG. 1 and the transparent conductive film 4 of the touch panel portion 2. FIG. 5 is a conceptual diagram in which the routing wiring portion 22 connected to the transparent conductive film 4 of the touch panel portion 2 of the composite input device 10 is bent along the folding line 23 and arranged on the side surface of the solar cell portion 1. FIG. 6 is a perspective view showing the routing wiring portion 22 of the composite input device 10. FIG. 7A is a schematic cross-sectional view showing a process of bending the lead wiring portion 22 of FIG. 5 along the fold line 23 and arranging it on the side surface of the solar cell portion 1. FIG. 1 is a schematic cross-sectional view showing a cross-sectional structure of a composite input device 10 obtained.

  The composite input device 10 includes a solar cell unit 1 and a touch panel unit 2 provided on a light receiving surface 12 of the solar cell unit 1. The composite input device 10 further includes a lead wiring portion 22 electrically connected to the side surface of the solar cell portion 1 through the transparent conductive film 4 of the touch panel portion 2 and the bent portion 24. The bent portion 24 is configured by the conductive nanowire material 3. Thereby, the routing wiring part 22 of the touch panel part 2 can be provided not on the light receiving surface 12 of the solar cell part 1 but on the side surface of the solar cell part 1. Therefore, the light receiving surface 12 of the solar cell unit 1 can be utilized to the maximum, and the power generation efficiency can be improved.

The arrangement of the lead wiring portion 22 electrically connected to the transparent conductive film 4 of the touch panel portion 2 on the side surface of the solar cell portion 1 will be further described.
FIG. 4 is a graph showing the relationship between the number of bendings and the resistance value change rate of 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. 4, a commonly used transparent conductive film made of ITO (indium tin oxide) material is vulnerable to bending, and its resistance value changes greatly even with slight bending. Therefore, as shown in the plan view of the conventional touch panel in FIG. 8, the lead wiring portion 22 from the transparent conductive film 4 is provided in the same plane as the transparent conductive film 4. A silver paste is usually used for the routing wiring portion 22. FIG. 9 is a cross-sectional view showing a cross-sectional structure when the touch panel unit 2 of FIG. 8 is provided on the solar cell unit 1. As shown in FIG. 9, when the conventional touch panel 2 is provided on the solar cell 1 as it is, the light transmittance of the portion of the lead wiring portion 22 made of silver paste is low and does not contribute to power generation. Therefore, only the portion excluding the routing wiring portion 22 is an effective light receiving surface 12.

  In the composite input device 10, the bent portion 24 that electrically connects the transparent conductive film 4 of the touch panel portion 2 and the routing wiring portion 22 is formed of the conductive nanowire material 3. As shown in the 8 mmφ mandrel bending test test result in FIG. 4, the transparent conductive film made of the silver nanowire material, which is one of the conductive nanowire materials 3, has almost no change in resistance even after the number of bending times exceeding 10. It has sufficient bending resistance. Therefore, as shown in FIG. 5 and FIG. 7A, even when the routing wiring portion 22 is bent along the folding line 23, the resistance value of the bent portion 24 made of the conductive nanowire material 3 does not change. As a result, as shown in FIG. 6 and FIG. 7B, the lead wiring part 22 can be disposed on the side surface of the solar cell unit 1, and the light receiving surface 12 of the solar cell unit 1 can be effectively used for power generation.

  Below, each structural member which comprises this composite input device 10 is demonstrated.

<Touch panel part>
The touch panel unit 2 can use a touch panel of any system such as a matrix switch system, a resistance film system, or a capacitance system. The touch panel unit 2 has an input surface 14 for input. The input surface 14 also functions as a surface for allowing light to enter the light receiving surface 12 of the solar cell unit 1. Note that the lowermost display portion for indicating the touch location may be, for example, the button 16 display by printing shown in FIG. Alternatively, a liquid crystal display unit may be further provided between the touch panel unit 2 and the solar cell unit 1. In addition, the transparent conductive film 4 of the touch panel unit 2 is electrically connected to the lead wiring unit 22 disposed on the side surface of the solar cell unit 1 through a bent unit 24 formed of the conductive nanowire material 3.

<Bending part>
The transparent conductive film 4 of the touch panel part 2 and the lead wiring part 22 arranged on the side surface of the solar cell part 1 are electrically connected by the bent part 24. The bent portion 24 is made of the conductive nanowire material 3 and hardly shows a change in resistance value even after being bent a plurality of times.

<Conductive nanowire material>
FIG. 3 is a schematic diagram showing the structure of a conductive nanowire material 3 having a diameter d and a length L. This conductive nanowire material 3 has an aspect ratio in the range of approximately 10-100,000. In addition, as shown in the 8 mmφ mandrel bending test result of FIG. 4, the transparent conductive film (■) made of a silver nanowire material, which is one of the conductive nanowire materials 3, is resistant even after being bent more than 10 times. It has sufficient bending resistance so that there is almost no change in value.

  As the conductive nanowire material 3, for example, metal nanowires such as silver, gold, copper, nickel, gold-plated silver and aluminum, and fibrous carbon such as carbon nanofibers and carbon nanotubes 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.

  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.

<Leading wiring section>
The lead-out wiring part 22 is arrange | positioned at the side surface of the solar cell part 1, as shown in FIG.1 and FIG.2. The routing wiring portion 22 is electrically connected to the transparent conductive film 4 of the touch panel portion 2 through the bent portion 24. Moreover, you may form the routing wiring part 22 with a silver paste etc., for example.

  In addition, you may provide the reflecting material which reflects light in the surface which contact | connects the side surface of the solar cell part 1 of the routing wiring part 22. FIG. Thereby, scattered light can be reflected in the solar cell unit 1, and the power generation efficiency can be further improved.

<Solar cell part>
As the solar cell unit 1, a solar cell that can generate electric power by photoelectrically converting light in a normal visible light region can be used. For example, any of a single crystal silicon solar cell, a polycrystalline silicon solar cell, an amorphous silicon solar cell, a compound solar cell, and the like may be used.

(Embodiment 2)
FIG. 11 is a block diagram illustrating a configuration of the composite input device 10a according to the second embodiment. This composite input device 10a is different from the composite input device according to Embodiment 1 in that it further includes a secondary battery unit 18 and a wireless communication unit 20. The secondary battery unit 18 stores the power generated by the solar cell unit 1. The wireless communication unit 20 performs wireless communication with the outside. According to the composite input device 10a, for example, the wireless communication unit 20 can be used to function as a remote controller. In this case, since the electric power generated by the solar cell unit 1 can be stored in the secondary battery unit 18, the electric power generated and stored in advance even when sufficient sunlight, lighting, or the like cannot be obtained. Can be used.

  The composite input device according to the present invention includes a lead wiring portion electrically connected to the side surface of the solar cell portion via a transparent conductive film of the touch panel portion and a bent portion. The bent portion is made of a conductive nanowire material, and can be provided on the side surface of the solar cell portion by bending the lead wiring portion of the touch panel portion. Therefore, the light-receiving surface of the solar cell unit 1 can be utilized to the maximum, power generation efficiency can be improved, and it is useful as a composite input device having a solar cell and a touch panel.

DESCRIPTION OF SYMBOLS 1 Solar cell part 2 Touch panel part 3 Conductive nanowire 4 Transparent conductive film 10 Composite input device 12 Light receiving surface 14 Input surface 16 Button 18 Secondary battery part 20 Wireless communication part 22 Leading wiring part 23 Folding line 24 Bending part

Claims (4)

A solar cell unit that can receive light from the light receiving surface and generate power;
A touch panel unit provided on the light receiving surface of the solar cell unit and having a transparent conductive film;
Provided on a side surface of the solar cell portion with respect to the light receiving surface, and a lead wiring portion connected to the transparent conductive film,
With
Constructed of a conductive nanowire material, and electrically connecting the transparent conductive film and the routing wiring portion by a bent portion that can be bent from the light receiving surface to the side surface ,
The said routing wiring part is a composite input device which provided the reflecting material which reflects light in the surface which contact | connects the said side surface of the said solar cell part . The composite input device according to claim 1 , wherein the transparent conductive film is made of a conductive nanowire material. The transparent conductive film is composed of ITO, composite input device according to claim 1. A wireless communication unit for performing wireless communication with the outside;
A battery for storing electric power generated by the solar cell;
The composite input device according to any one of claims 1 to 3 , further comprising: