Patent Publication Number: US-2020293135-A1

Title: Input device

Description:
TECHNICAL FIELD 
     The present invention relates to an input device including a touch sensor. 
     BACKGROUND 
     A photoelectric conversion element such as a dye-sensitized solar cell or an organic thin film solar cell is expected as a power source of various devices. In many cases, the photoelectric conversion element is typically used only as a cell, but recently, a case has also increased in which the photoelectric conversion element is included in an input device including a touch sensor, as a power source of the input device. 
     For example, in Patent Document 1 described below, an input device including a dye-sensitized solar cell, and a touch sensor facing the dye-sensitized solar cell, is disclosed. In this publication, it is also disclosed that the dye-sensitized solar cell includes a transparent electrode substrate provided on a side facing the touch sensor, a counter substrate which is provided on a side facing away from the touch sensor, with respect to the transparent electrode substrate, and faces the transparent electrode substrate, and a porous semiconductor layer provided between the transparent electrode substrate and the counter substrate. 
     PATENT DOCUMENT 
     Patent Document 1: JP 2013-89527 A 
     However, the input device described in Patent Document 1 described above is not durable. 
     That is, the input device described in Patent Document 1, has room for improvement in durability. 
     SUMMARY 
     One or more embodiments provide an input device capable of improving durability. 
     The present inventors have considered as follows. That is, first, the touch sensor, for example, typically includes a display unit such as “1” and “2”, and the display unit overlaps with a porous semiconductor layer of a dye-sensitized solar cell in the case of viewing the display unit in a thickness direction of a substrate constituting the touch sensor. Here, when light incident from the touch sensor is incident on the dye-sensitized solar cell, the porous semiconductor layer is divided into a portion which becomes a shadow of the display unit, and a portion on which light is incident without being a shadow. The present inventors have considered that a bias is generated at this time in a generation amount of electrons between the portion which becomes the shadow and the portion which does not become the shadow, and as a result, a dye deteriorates, and thus, power generation performance is degraded. Therefore, as a result of conducting intensive studies, the present inventors have completed the invention. 
     That is, one or more embodiments of the invention are directed to an input device including: at least one photoelectric conversion cell; and a touch sensor which faces the at least one photoelectric conversion cell, and includes a substrate, a display unit being visible in the case of viewing the touch sensor and the photoelectric conversion cell in a thickness direction of the substrate of the touch sensor, in which the photoelectric conversion cell includes, a transparent electrode substrate provided on the touch sensor side, a counter substrate which is provided on a side facing away from the touch sensor, with respect to the transparent electrode substrate, and faces the transparent electrode substrate, a power generation portion which is provided between the transparent electrode substrate and the counter substrate, and contains a dye, and a non-power generation portion provided to be adjacent to the power generation portion and to overlap with the display unit in the case of viewing the power generation portion and the display unit in the thickness direction of the substrate of the touch sensor. 
     According to one or more embodiments of the input device, in the case of viewing the power generation portion and the display unit in the thickness direction of the substrate of the touch sensor, the display unit is provided to be adjacent to the power generation portion of the photoelectric conversion cell and to overlap with the non-power generation portion. For this reason, when light is incident on the photoelectric conversion cell through the touch sensor, light is incident on the power generation portion other than the display unit without forming a portion which becomes a shadow by the display unit. That is, a portion on which light is incident, and a portion on which light is not incident are sufficiently prevented from being formed in the power generation portion. As a result, in the power generation portion, a bias in a generation amount of electrons is sufficiently prevented from being generated. As a result, deterioration of the dye is suppressed. Therefore, according to the invention, it is possible to improve durability of the photoelectric conversion cell, and also to improve durability of the input device. 
     In the input device described above, the display unit may be included in a photoelectric conversion cell or a touch panel. 
     In the input device described above, the photoelectric conversion cell may further include a ring-shaped sealing portion joining the transparent electrode substrate and the counter substrate together, the touch sensor may include an electrode which is provided on the substrate, and may be provided to overlap with the display unit in the case of viewing the touch sensor and the photoelectric conversion cell in the thickness direction of the substrate of the touch sensor, and a wiring connected to the electrode, and at least a part of the wiring may be disposed to overlap with the ring-shaped sealing portion and to be along the ring-shaped sealing portion in the case of viewing the wiring and the ring-shaped sealing portion in the thickness direction of the substrate of the touch sensor. 
     In this case, since at least a part of the wiring is disposed to overlap with the ring-shaped sealing portion and to be along the ring-shaped sealing portion in the case of viewing the wiring and the ring-shaped sealing portion in the thickness direction of the substrate of the touch sensor, it is possible to decrease an area of the wiring blocking the incidence of light onto the power generation portion, and to increase an aperture ratio. 
     In the input device described above, in the touch sensor, the electrode may be composed of a mesh wiring. 
     In this case, in a case where the electrode is provided to overlap with the power generation portion in the case of viewing the power generation portion and the electrode in the thickness direction of the substrate of the touch sensor, it is possible to increase an incidence amount of light onto the power generation portion, and to further improve photoelectric conversion characteristics of the photoelectric conversion cell. 
     In the input device described above, a difference in transmittance of visible light between a portion passing through the mesh wiring and a portion passing through a portion other than the mesh wiring may be less than or equal to 10%. 
     In this case, since it is possible to further decrease a variation in a power generation amount of the power generation portion receiving light, compared to a case where a difference in transmittance of visible light between the portion passing through the mesh wiring and the portion passing through the portion other than the mesh wiring is greater than 10%, it is possible to further increase service life of the photoelectric conversion cell. For this reason, it is possible to further increase service life of the input device. 
     In the input device described above, the photoelectric conversion cell may include an electrolyte between the transparent electrode substrate and the counter substrate, and the non-power generation portion may include an insulating portion containing a coloring material, and a covering portion covering the insulating portion. 
     In this case, since in the non-power generation portion, the insulating portion is covered with the covering portion, it is more sufficiently prevented that the insulating portion containing the coloring material is in contact with the electrolyte and then the coloring material is dissolved in the electrolyte. Accordingly, it is possible to reduce the amount of coloring material entering the electrolyte. For this reason, according to the input device of the invention, it is possible to suppress deterioration in photoelectric conversion characteristics due to the mixing of the coloring material, and to more sufficiently improve the durability. 
     In the input device described above, the insulating portion may contain an insulating material, and the insulating material may contain an inorganic insulating material. 
     In this case, a dimensional change of the insulating portion further decreases, compared to a case where the insulating material does not contain the inorganic insulating material. 
     In the input device described above, the coloring material may be composed of an oxide of a transition metal. 
     In this case, it is possible to more sufficiently prevent the coloring material from being dissolved in the electrolyte. 
     In the input device described above, a content ratio of the coloring material in the covering portion may be less than a content ratio of the coloring material in the insulating portion. 
     In this case, the coloring material in the non-power generation portion is sufficiently prevented from being mixed into the electrolyte, compared to a case where the content ratio of the coloring material in the covering portion is greater than or equal to the content ratio of the coloring material in the insulating portion. For this reason, in the photoelectric conversion cell, it is possible to suppress deterioration in the photoelectric conversion characteristics due to the mixing of the coloring material, and to more sufficiently improve the durability. 
     In the input device described above, in a surface of the insulating portion excluding an interface between the insulating portion and the transparent electrode substrate from the surface, an area of a region in which the covering portion is not provided, may be less than or equal to 10%. 
     In this case, even in a case where the coloring material in the insulating portion is dissolved into the electrolyte, it is possible to more sufficiently reduce an influence on the durability of the photoelectric conversion cell, compared to a case where the area of the region described above is greater than 10%. 
     In the input device described above, the non-power generation portion may also function as the display unit. 
     In this case, since it is not necessary to provide the display unit in the touch sensor by the non-power generation portion also functioning as the display unit, it is possible to further reduce the thickness of the touch sensor, and to further reduce the size of the input device. 
     In the input device described above, the photoelectric conversion cell may include an electrolyte between the transparent electrode substrate and the counter substrate, and the touch sensor may include the display unit. 
     In this case, in the input device, the non-power generation portion is not visible in the case of viewing the non-power generation portion and the display unit in the thickness direction of the substrate of the touch sensor, and thus, it is not necessary for the non-power generation portion to contain the coloring material. For this reason, the coloring material in the non-power generation portion is sufficiently prevented from being mixed into the electrolyte. For this reason, in the photoelectric conversion cell, it is possible to suppress deterioration in the photoelectric conversion characteristics due to the mixing of the coloring material, and to more sufficiently improve the durability. 
     In the input device described above, for example, the at least one photoelectric conversion cell is composed of a plurality of photoelectric conversion cells, and the plurality of photoelectric conversion cells are connected in series. 
     According to one or more embodiments of the invention, an input device capable of improving durability is provided. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a plan view illustrating one or more embodiments of an input device of the invention; 
         FIG. 2  is a sectional view schematically illustrating the input device of  FIG. 1 ; 
         FIG. 3  is a plan view illustrating a part of the input device of  FIG. 1 ; 
         FIG. 4  is a sectional view along line IV-IV of  FIG. 3 ; 
         FIG. 5  is a sectional view illustrating a non-power generation portion of  FIG. 4 ; 
         FIG. 6  is a plan view in the case of viewing a power generation portion and a non-power generation portion of a photoelectric conversion element of  FIG. 2  from a touch sensor side; 
         FIG. 7  is a sectional view along line VII-VII of  FIG. 6 ; and 
         FIG. 8  is a sectional end view illustrating main parts of one or more embodiments of an input device of the invention. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments of an input device according to the invention will be described in detail, with reference to  FIG. 1  to  FIG. 7 . Furthermore,  FIG. 1  is a plan view illustrating one or more embodiments of the input device of the invention,  FIG. 2  is a sectional view schematically illustrating the input device of  FIG. 1 ,  FIG. 3  is a plan view illustrating a part of the input device of  FIG. 1 ,  FIG. 4  is a sectional view along line IV-IV of  FIG. 3 ,  FIG. 5  is a sectional view illustrating a non-power generation portion of  FIG. 4 ,  FIG. 6  is a plan view in the case of viewing a power generation portion and a non-power generation portion of a photoelectric conversion element of  FIG. 2  from a touch sensor side, and  FIG. 7  is a sectional view along line VII-VII of  FIG. 6 . 
     As illustrated in  FIG. 1  and  FIG. 2 , an input device  100  includes a housing  110  provided with a first opening  110   a  and a second opening  110   b . Inside the housing  110 , there are provided a touch sensor  120  disposed to block the first opening  110   a  of the housing  110 , one photoelectric conversion cell  130  disposed in a position facing the touch sensor  120 , a liquid crystal display unit  140  disposed to block the second opening  110   b  of the housing  110 , a storage cell  150  connected to the photoelectric conversion cell  130 , and a control unit  160  which is electrically connected to the touch sensor  120 , the photoelectric conversion cell  130 , and the liquid crystal display unit  140 , and allows the liquid crystal display unit  140  to display the corresponding numeric characters on the basis of the manipulation of the touch sensor  120 . 
     As illustrated in  FIG. 4  and  FIG. 6 , the photoelectric conversion cell  130  includes a transparent electrode substrate  20 , a counter substrate  30  facing the transparent electrode substrate  20 , a ring-shaped sealing portion  40  joining the transparent electrode substrate  20  and the counter substrate  30  together, a power generation portion  50  which is provided on the transparent electrode substrate  20 , and contains a dye, a non-power generation portion  70  provided on the transparent electrode substrate  20  to be adjacent to the power generation portion  50 , and an electrolyte  60  provided between the transparent electrode substrate  20  and the counter substrate  30 . Here, the transparent electrode substrate  20  is provided on the touch sensor  120  side, and the counter substrate  30  is provided on a side facing away from the touch sensor  120 , with respect to the transparent electrode substrate  20 . In addition, the non-power generation portion  70  also functions as the display unit according to one or more embodiments, and is provided to overlap with the display unit in the case of viewing the display unit and the non-power generation portion  70  in a thickness direction A of a substrate  121  of the touch sensor  120 . 
     On the other hand, as illustrated in  FIG. 3  and  FIG. 4 , the touch sensor  120  includes the substrate  121 , an electrode  121   a  provided on the substrate  121 , and a covering layer  122  provided on the substrate  121  to cover the electrode  121   a . Here, in the touch sensor  120 , the non-power generation portion  70  which also functions as the display unit of the photoelectric conversion cell  130 , is visible in the case of viewing the touch sensor  120  in the thickness direction A of the substrate  121  of the touch sensor  120  (a direction orthogonal to a surface of the substrate  121  of the touch sensor  120 ). In  FIG. 1  and  FIG. 3 , ten non-power generation portions  70  are illustrated, and constitute numeric characters of “0” to “9”, respectively. Furthermore, the non-power generation portion  70  and the electrode  121   a  as the display unit are arranged to overlap with each other in the case of being seen in the thickness direction A of the substrate  121  of the touch sensor  120 . 
     In addition, as illustrated in  FIG. 1  and  FIG. 3 , in the touch sensor  120 , a wiring  125  is connected to the electrode  121   a . At least a part of the wiring  125  extends from the electrode  121   a  and is disposed to overlap with the ring-shaped sealing portion  40  and to be along the ring-shaped sealing portion  40  in the case of viewing the wiring  125  and the ring-shaped sealing portion  40  in the thickness direction A of the substrate  121  of the touch sensor  120 . Then, an end portion of the wiring  125  is connected to the control unit  160  (refer to  FIG. 2 ). 
     According to the input device  100 , the non-power generation portion  70  which also functions as the display unit, is visible in the case of viewing the non-power generation portion  70  as the display unit in the thickness direction A of the substrate  121  of the touch sensor  120 . That is, in the input device  100 , the display unit is provided to be adjacent to the power generation portion  50  of the photoelectric conversion cell  130  and to overlap with the non-power generation portion  70 . For this reason, as illustrated in  FIG. 7 , when light L is incident on the photoelectric conversion cell  130  through the touch sensor  120 , light is incident on the power generation portion  50  without forming a portion which becomes a shadow by the display unit. That is, in the power generation portion  50 , a portion on which light is incident, and a portion on which light is not incident, are sufficiently prevented from being formed. For this reason, in the power generation portion  50 , a bias in a generation amount of electrons is sufficiently prevented from being generated. As a result, deterioration of a dye is suppressed. Accordingly, in the input device  100 , durability of the photoelectric conversion cell  130  is improved, and durability of the input device  100  is also improved. 
     In addition, in the input device  100 , the touch sensor  120  includes the wiring  125  connected to the electrode  121   a , and at least a part of the wiring  125  is disposed to overlap with the ring-shaped sealing portion  40  and to be along the ring-shaped sealing portion  40  in the case of viewing the wiring  125  and the ring-shaped sealing portion  40  in the thickness direction A of the substrate  121  of the touch sensor  120 . 
     For this reason, it is possible to decrease an area of the wiring  125  blocking the incidence of light onto the power generation portion  50 , and to increase an aperture ratio. 
     Further, in the input device  100 , the non-power generation portion  70  also functions as the display unit, and thus, it is not necessary to provide the display unit in the touch sensor  120 . For this reason, it is possible to further reduce the thickness of the touch sensor  120 , and to further reduce the size of the input device  100 . 
     Next, the touch sensor  120  and the photoelectric conversion cell  130  will be described in detail. 
     &lt;&lt;Touch Sensor&gt;&gt; 
     As described above, the touch sensor  120  includes the substrate  121 , the electrode  121   a  provided on the substrate  121 , and the covering layer  122  provided on the substrate  121  to cover the electrode  121   a.    
     (Substrate) 
     For example, a resin film such as a PET film and a PEN film, a substrate composed of an inorganic material such as glass, and the like can be used as the substrate  121 . 
     (Electrode) 
     The electrode  121   a  is provided to overlap with the non-power generation portion  70  in the case of viewing the non-power generation portion  70  and the electrode  121   a  as the display unit in the thickness direction A of the substrate  121  of the touch sensor  120 . In one or more embodiments, the electrode  121   a  may be composed of a mesh wiring. In this case, when the electrode  121   a  is provided to overlap with the power generation portion  50  in the case of viewing the power generation portion  50  and the electrode  121   a  in the thickness direction A of the substrate  121  of the touch sensor  120 , it is possible to increase an incidence amount of light onto the power generation portion  50 , and thus, it is possible to further improve photoelectric conversion characteristics of the photoelectric conversion cell  130 . In a case where the electrode  121   a  is composed of the mesh wiring, an opaque metal material such as silver or copper, or a carbon material can be used as the electrode  121   a . Here, in a case where light is incident in the thickness direction A of the substrate  121  of the touch sensor  120 , a difference in transmittance of visible light between a portion passing through the mesh wiring and a portion passing through a portion other than the mesh wiring may be less than or equal to 10%. In this case, it is possible to further decrease a variation in a power generation amount of the power generation portion  50  receiving light, and thus, it is possible to increase service life of the photoelectric conversion cell  130 . For this reason, it is possible to increase service life of the input device  100 . In one or more embodiments the difference in the transmittance of the visible light may be less than or equal to 5%. In a case where the electrode  121   a  is composed of the mesh wiring, a line width of the mesh wiring is not particularly limited, and for example, may be less than or equal to 100 μm. However, it is not necessary that the electrode  121   a  be composed of the mesh wiring. For example, the electrode  121   a  can be composed of a transparent metal material such as ITO or FTO. 
     (Covering Layer) 
     The covering layer  122  may be constituted by a transparent material. Examples of such the transparent material include a transparent resin such as an epoxy resin, an acrylic resin, a polyester resin, a urethane resin, a vinyl resin, a silicone resin, a phenol resin or a polyimide resin. 
     The covering layer  122  can be obtained by covering the substrate  121  with the transparent resin using a printing method or the like. 
     &lt;&lt;Photoelectric Conversion Cell&gt;&gt; 
     Next, the photoelectric conversion cell  130  will be described in detail. 
     The photoelectric conversion cell  130  has a transparent electrode substrate  20 , the counter substrate  30 , the sealing portion  40 , the power generation portion  50 , the non-power generation portion  70  and the electrolyte  60 . Hereinafter, these will be described in detail. 
     &lt;Transparent Electrode Substrate&gt; 
     The transparent electrode substrate  20  comprises a transparent substrate  21 , and a transparent conductive layer  22  which is provided on a side of the transparent substrate  21  facing the counter substrate  30  and serves as an electrode. 
     (Transparent Substrate) 
     The material constituting the transparent substrate  21  may be a transparent insulating material, for example, and examples of such a transparent material include glass such as borosilicate glass, soda lime glass, glass which is made of soda lime and whose iron component is less than that of ordinary soda lime glass, and quartz glass, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), and polyethersulfone (PES). The thickness of the transparent substrate  21  is appropriately determined depending on the size of the photoelectric conversion cell  130  and is not particularly limited, but it may be set to the range of from 0.050 to 10 mm, for example. 
     (Transparent Conductive Layer) 
     Examples of the material constituting the transparent conductive layer  22  include a conductive metal oxide such as indium-tin-oxide (ITO), tin oxide (SnO 2 ), and fluorine-doped-tin-oxide (FTC)). The transparent conductive layer  22  may be constituted by a single layer or a laminate consisting of a plurality of layers containing different conductive metal oxides. In one or more embodiments the transparent conductive layer  22  may contain FTO since the FTO exhibits high heat resistance and chemical resistance in a case in which the transparent conductive layer  22  is constituted by a single layer. The thickness of the transparent conductive layer  22  may be set to the range of from 0.01 to 2 μm, for example. 
     (Counter Substrate) 
     The counter substrate  30 , which is composed of a counter electrode according to one or more embodiments, comprises the conductive substrate  31  and the catalyst layer  32  which is provided on a side of the conductive substrate  31  facing the transparent electrode substrate  20  and contributes to reduction of the electrolyte  60 . 
     The conductive substrate  31  may be constituted by a corrosion-resistant metal material such as titanium, nickel, molybdenum, tungsten, aluminum, or stainless steel. Moreover, the conductive substrate  31  may be a laminate in which a conductive layer composed of a conductive oxide such as ITO or FTO is formed as an electrode on the transparent substrate  21  described above. The thickness of the conductive substrate  31  is appropriately determined depending on the size of the photoelectric conversion cell  130 , and is not particularly limited, but may be set to 0.005 mm to 0.1 mm, for example. 
     The catalyst layer  32  is constituted by a conductive material. Examples of the conductive material include a metal material such as platinum, a carbon-based material and a conductive polymer. Here, a carbon nanotube may be used as the carbon-based material. 
     (Sealing Portion) 
     Examples of the sealing portion  40  include a resin such as a thermoplastic resin including a modified polyolefin resin or a vinyl alcohol polymer, or an ultraviolet curable resin. Examples of the modified polyolefin resin include an ionomer, an ethylene-vinyl acetic anhydride copolymer, an ethylene-methacrylic acid copolymer and an ethylene-vinyl alcohol copolymer. These can be used singly or in a combination of two or more types of such resins. 
     &lt;Power Generation Portion&gt; 
     The power generation portion  50  includes an oxide semiconductor layer and a dye supported on the oxide semiconductor layer. 
     (Oxide Semiconductor Layer) 
     The oxide semiconductor layer is composed of oxide semiconductor particles. The oxide semiconductor particles are composed of, for example, titanium oxide (TiO 2 ), zinc oxide (ZnO), tungsten oxide (WO 3 ), niobium oxide (Nb 2 O 5 ), strontium titanate (SrTiO 3 ), tin oxide (SnO 2 ), indium oxide (In 2 O 3 ), zirconium oxide (ZrO 2 ), tallium oxide (Ta 2 O 5 ), lanthanum oxide (La 2 O 3 ), yttrium oxide (Y 2 O 3 ), holmium oxide (Ho 2 O 3 ), bismuth oxide (Bi 2 O 3 ), cerium oxide (CeO 2 ), aluminum oxide (Al 2 O 3 ) or two or more kinds of these. The thickness of the oxide semiconductor layer  50  may be set to 0.1 μm to 100 μm, for example. 
     &lt;Dye&gt; 
     As the dye, for example, a photosensitizing dye such as a ruthenium complex having a ligand including a bipyridine structure or a terpyridine structure, an organic dye including porphyrin, eosin, rhodamine or merocyanine; or an organic-inorganic composite dye including a halogenated lead-based perovskite crystal are exemplified. As the halogenated lead-based perovskite, for example, CH 3 NH 3 PbX 3  (X═Cl, Br, I) is used. Among the above-mentioned dyes, a ruthenium complex having a ligand including a bipyridine structure or a terpyridine structure may be used. In this case, it is possible to further improve the photoelectric conversion characteristics of the photoelectric conversion cell  130 . Furthermore, in a case using a photosensitizing dye as the dye, the photoelectric conversion cell  130  becomes a dye-sensitized photoelectric conversion cell. 
     &lt;Non-Power Generation Portion&gt; 
     The non-power generation portion  70  may not have a photoelectric conversion function. However, according to one or more embodiments, the non-power generation portion  70  also functions as the display unit, and thus, it is necessary that the non-power generation portion  70  can be viewed by being distinguished from the power generation portion  50  in the case of viewing the non-power generation portion  70  and the power generation portion  50  in the thickness direction A of the substrate  121  of the touch sensor  120 . Specifically, as illustrated in  FIG. 5 , the non-power generation portion  70  is composed including an insulating portion  71  containing a coloring material. Here, the coloring material indicates a substance having an absorption peak in a wavelength range of visible light. 
     The insulating portion  71  contains an insulating material. For example, an inorganic insulating material such as glass frit, and an organic insulating material such as a thermosetting resin (a polyimide resin or the like) and a thermoplastic resin are exemplified as the insulating material. Among them, the inorganic insulating material such as glass frit may be the insulating material. In this case, a dimensional change of the insulating portion  71  further decreases, compared to a case where the insulating material is not the inorganic insulating material. 
     The coloring material contained in the insulating portion  71  may be any coloring material as long as the coloring material colors the insulating portion  71 , and examples of such the coloring material include, for example, an oxide of a transition metal, a carbon-based material, an organic dye, and the like. These can be used singly or in a combination of two or more types of such coloring materials. Among them, the oxide of the transition metal may be the coloring material. In this case, it is possible to more sufficiently prevent the coloring material from being dissolved in the electrolyte  60 . 
     For example, copper oxide, iron oxide, cobalt oxide, manganese oxide, and the like are exemplified as the oxide of the transition metal. These can be used singly or in a combination of two or more types of such oxides. 
     A content ratio of the coloring material in the insulating portion  71  is not particularly limited, but may be greater than or equal to 5 mass %. In this case, it is possible to further decrease light transmittivity, compared to a case where the content ratio of the coloring material in the insulating portion  71  is less than 5 mass %. The content ratio of the coloring material in the insulating portion  71  may be greater than or equal to 7 mass %, and may also be greater than or equal to 9 mass %. However, the content ratio of the coloring material in the insulating portion  71  may be less than or equal to 30 mass %. The coloring material can be more sufficiently prevented from being dissolved in the electrolyte  60 , compared to a case where the content ratio of the coloring material in the insulating portion  71  is greater than 30 mass %. The content ratio of the coloring material in the insulating portion  71  may be less than or equal to 27 mass %, and may also be less than or equal to 25 mass %. 
     Further, as illustrated in  FIG. 5 , the non-power generation portion  70  may further include a covering portion  72  covering the insulating portion  71 , in addition to the insulating portion  71  containing the coloring material. In this case, in the non-power generation portion  70 , the insulating portion  71  is covered with the covering portion  72 , and thus, it is possible to sufficiently prevent the insulating portion  71  containing the coloring material from being in contact with the electrolyte  60  and being dissolved in the electrolyte  60 . Accordingly, in the photoelectric conversion cell  130 , it is possible to reduce the amount of coloring material entering the electrolyte  60 . For this reason, according to the input device  100 , it is possible to suppress a deterioration in the photoelectric conversion characteristics due to the mixing of the coloring material, and to more sufficiently improve the durability. In particular, the covering portion  72  is effective in a case where the total area of the non-power generation portion  70  within a region surrounded by the sealing portion  40  (within a region surrounded by a broken line of  FIG. 3 ) is greater than or equal to 10%. 
     (Covering Portion) 
     The covering portion  72  is composed of an insulating material. The same insulating material as that constituting the insulating portion  71  can be used as the insulating material. The insulating material constituting the covering portion  72  may be identical to or different from the insulating material constituting the insulating portion  71 . 
     A content ratio of the coloring material in the covering portion  72  may be less than the content ratio of the coloring material in the insulating portion  71 , or may be greater than or equal to the content ratio of the coloring material in the insulating portion  71 , but the content ratio of the coloring material in the covering portion  72  may be less than the content ratio of the coloring material in the insulating portion  71 . In this case, the coloring material in the non-power generation portion  70  is more sufficiently prevented from being mixed into the electrolyte  60 , compared to a case where the content ratio of the coloring material in the covering portion  72  is greater than or equal to the content ratio of the coloring material in the insulating portion  71 . For this reason, in the photoelectric conversion cell  130 , it is possible to suppress deterioration in the photoelectric conversion characteristics due to the mixing of the coloring material, and to more sufficiently improve the durability. Here, the content ratio of the coloring material in the covering portion  72  may be 0 mass %. That is, the covering portion  72  may not contain the coloring material. In addition, the content ratio of the coloring material in the covering portion  72  may be greater than 0 mass % as long as the content ratio is less than the content ratio in the insulating portion  71 . That is, in a case where the content ratio of the coloring material in the covering portion  72  is the content ratio less than the content ratio in the insulating portion  71 , the covering portion  72  may contain the coloring material. 
     In this case, the coloring material in the covering portion  72  typically means the same coloring material as the coloring material contained in the insulating portion  71 . For example, the coloring material in the covering portion  72  is also the oxide of the transition metal, if the coloring material contained in the insulating portion  71  is the oxide of the transition metal. 
     The thickness of the covering portion  72  from a surface of the insulating portion  71  is typically 3 μm to 20 μm, and may be 5 μm to 10 μm. 
     Furthermore, in the surface of the insulating portion  71  excluding an interface between the insulating portion  71  and the transparent electrode substrate  20  from the surface, an area of a region in which the covering portion  72  is not provided, may be less than or equal to 10%. In this case, even in a case where the coloring material in the insulating portion  71  is dissolved into the electrolyte  60 , it is possible to more sufficiently reduce an influence on the durability of the photoelectric conversion cell  130 , compared to a case where the area of the region described above is greater than 10%. The area of the region described above may be less than or equal to 8%, and may also be less than or equal to 6%. 
     (Electrolyte) 
     The electrolyte  60  contains a redox couple and an organic solvent. It is possible to use acetonitrile, methoxy acetonitrile, methoxy propionitrile, propionitrile, ethylene carbonate, propylene carbonate, diethyl carbonate, γ-butyrolactone, valeronitrile, or pivalonitrile as the organic solvent. Examples of the redox couple include a redox couple such as a zinc complex, an iron complex, and a cobalt complex in addition to a redox couple containing a halogen atom such as iodide ion/polyiodide ion (for example, I − /I 3   − ) or bromide ion/polybromide ion. Incidentally, iodide ion/polyiodide ion can be formed by iodine (I 2 ) and a salt (ionic liquid or a solid salt) containing an iodide (I − ) as an anion. In a case of using ionic liquid having an iodide as an anion, only iodine may be added. In a case of using an organic solvent, or ionic liquid other than iodide as an anion, a salt containing iodide (I − ) as an anion, such as LiI or tetrabutylammonium iodide may be added. In addition, the electrolyte  60  may use ionic liquid instead of the organic solvent. As the ionic liquid, for example, a known iodine salt, such as a pyridinium salt, an imidazolium salt, or a triazolium salt is used. As such an iodine salt, for example, 1-hexyl-3-methylimidazolium iodide, 1-ethyl-3-propylimidazolium iodide, 1-ethyl-3-methylimidazolium iodide, 1,2-dimethyl-3-propylimidazolium iodide, 1-butyl-3-methylimidazolium iodide, or 1-methyl-3-propylimidazolium iodide may be used. 
     In addition, the electrolyte  60  may use a mixture of the above-mentioned ionic liquid and the above-mentioned organic solvent instead of the above-mentioned organic solvent. 
     In addition, it is possible to add an additive to the electrolyte  60 . Examples of the additive include benzimidazole such as 1-methylbenzimidazole (NMB) or 1-butylbenzimidazole (NBB), LiI, tetrabutylammonium iodide, 4-t-butylpyridine and guanidium thiocyanate. Among them, benzimidazole may be the additive. 
     Moreover, as the electrolyte  60 , a nanocomposite gel electrolyte which is a quasi-solid electrolyte obtained by kneading nanoparticles such as SiO 2 , TiO 2  and carbon nanotubes with the above-mentioned electrolyte to form a gel-like form may be used, or an electrolyte gelled using an organic gelling agent such as polyvinylidene fluoride, a polyethylene oxide derivative and an amino acid derivative may also be used. 
     The invention is not limited to the embodiments described above. For example, in the embodiments described above, the non-power generation portion  70  is composed by including the insulating portion  71  containing the coloring material, but the non-power generation portion  70  is not necessarily limited to a non-power generation portion which is composed including the insulating portion  71  containing the coloring material. For example, the non-power generation portion  70  may be composed of a mere space as long as the non-power generation portion  70  can be viewed by being distinguished from the power generation portion  50  in the case of viewing the non-power generation portion  70  and the power generation portion  50  in the thickness direction A of the substrate  121  of the touch sensor  120 . In addition, if a light reflection layer is provided on the counter substrate  30  side, with respect to the power generation portion  50 , and the light reflection layer can be viewed by being distinguished from the power generation layer  50 , a portion of the light reflection layer, which can be viewed through the space in the case of viewing the non-power generation portion  70  in the thickness direction A of the substrate  121  of the touch sensor  120 , is the non-power generation portion  70 . 
     In addition, in the embodiments described above, the non-power generation portion  70  of the photoelectric conversion cell  130  also functions as the display unit, and the touch sensor  120  does not include the display unit, but like an input device  200  illustrated in  FIG. 8 , a touch sensor  220  may include a display unit  124 . In this case, when light is incident on the photoelectric conversion cell  130  through the touch sensor  220 , a portion which becomes a shadow by the display unit  124 , is formed in the non-power generation portion  70 , but light is incident on the power generation portion  50  without forming a portion which becomes a shadow by the display unit  124 . That is, in the power generation portion  50 , the portion on which light is incident, and the portion on which light is not incident are sufficiently prevented from being formed. For this reason, in the power generation portion  50 , a bias in the generation amount of the electrons is sufficiently prevented from being generated. As a result, the deterioration of the dye is suppressed. Accordingly, even in the input device  200  illustrated in  FIG. 8 , the durability of the photoelectric conversion cell  130  is improved, and the durability of the input device  200  is also improved. In addition, in the input device  200  illustrated in  FIG. 8 , the non-power generation portion  70  is not visible in the case of viewing the non-power generation portion  70  and the display unit  124  in the thickness direction A of the substrate  121  of the touch sensor  220 , and thus, it is not necessary that the non-power generation portion  70  contain the coloring material. For this reason, the coloring material in the non-power generation portion  70  is sufficiently prevented from being mixed into the electrolyte  60 . For this reason, in the photoelectric conversion cell  130 , it is possible to suppress deterioration in the photoelectric conversion characteristics due to the mixing of the coloring material, and to more sufficiently improve the durability. Here, the display unit  124  may be disposed on the inside of an outline forming the non-power generation portion  70  in the case of viewing the display unit  124  and the non-power generation portion  70  in the thickness direction A of the substrate  121  of the touch sensor  220 . 
     Further, in the embodiments described above, at least a part of the wiring  125  is disposed to overlap with the ring-shaped sealing portion  40  and to be along the ring-shaped sealing portion  40  in the case of viewing the wiring  125  and the ring-shaped sealing portion  40  in the thickness direction A of the substrate  121  of the touch sensor  120 , but the wiring  125  may not be necessarily disposed to overlap with the ring-shaped sealing portion  40  and to be along the ring-shaped sealing portion  40 . 
     In addition, in the embodiments described above, the non-power generation portion  70  also functions as the display unit, and the display units constitute the numeric characters of “0” to “9”, respectively, but the display unit is not limited to the numeric character, and may be information such as characters, diagrams, symbols, or a combination thereof. 
     In addition, in the embodiments described above, the oxide semiconductor layer  50  is provided on the transparent electrode substrate  20  in the photoelectric conversion cell  130 , but the oxide semiconductor layer  50  may be provided on the counter substrate  30 . In this case, a catalytic layer  32  is provided on the transparent electrode substrate  20 . 
     Further, in the embodiments described above, the counter substrate  30  is composed of a counter electrode, and the transparent electrode substrate  20  and the counter substrate  30  are linked by the sealing portion  40 , but in a case where a porous insulating layer impregnated with the electrolyte  60  and an electrode layer are sequentially laminated on the oxide semiconductor layer  50  between the transparent electrode substrate  20  and the counter substrate  30 , the counter substrate  30  may be composed of an insulating base material instead of the counter electrode. 
     In addition, in the embodiments described above, the input device  100  includes the housing  110 , the liquid crystal display unit  140 , the storage battery  150 , and the control unit  160 , but these are not necessarily required, and can be omitted. 
     In addition, in the embodiments described above, the input device  100  includes one photoelectric conversion cell  130 , but the input device  100  may include a plurality of photoelectric conversion cells  130 . Here, the plurality of photoelectric conversion cells  130  may be connected in series, or may be connected in parallel. 
     EXAMPLES 
     Hereinafter, the contents of the invention will be described more specifically by using examples, but the invention is not limited to the following examples. 
     Example 1 
     First, a laminated body was prepared in which a transparent conductive layer formed of FTO and having a thickness of 1 μm was formed on a transparent substrate formed of glass and having a thickness of 1 mm. 
     Next, a paste for forming an insulating portion containing glass frit and a coloring material was applied onto the transparent conductive layer by screen printing to form a character of “2”, and was dried, and thus, a precursor of an insulating portion was formed. At this time, in the paste for forming an insulating portion, the coloring material was contained such that a content ratio of the coloring material in the glass frit was 15 mass %. A coloring material formed of iron oxide, copper oxide, and manganese oxide was used as the coloring material. 
     Subsequently, a precursor of a covering portion was formed to cover the entire precursor of the insulating portion. The precursor of the covering portion was formed by applying and drying a paste for forming a covering portion formed of glass frit. At this time, a content ratio of a coloring material in the paste for forming a covering portion was 0 mass %. 
     Further, a precursor of an oxide semiconductor layer constituting a power generation portion was formed on the transparent conductive layer. However, at this time, the precursor of the covering portion was not covered. The precursor of the oxide semiconductor layer was formed by applying a paste for forming an oxide semiconductor layer containing titania particles by screen printing and drying the paste. 
     Next, the precursor of the insulating portion, the precursor of the covering portion, and the precursor of the oxide semiconductor layer were fired at 500° C. for 1 hour. Thus, an electrode structure including a non-power generation portion formed of the insulating portion and the covering portion, and the oxide semiconductor layer constituting the power generation portion, was obtained. 
     Next, the electrode structure described above was dipped in a dye solution, in which 0.2 mM of a photosensitized dye formed of N719 was contained, and a solvent was a mixed solvent obtained by mixing acetonitrile and tertbutanol at a volume ratio of 1:1, for a full day and night, and then, was taken out and dried, and thus, the photosensitized dye was supported on the oxide semiconductor layer. 
     Next, an electrolyte formed of 2 M of 1-hexyl-3-methyl imidazolium iodide, 0.002 M of I 2 , 0.3 M of n-methyl benzimidazole, and 0.1 M of guanidium thiocyanate in a solvent formed of 3-methoxy propionitrile was dropped on the oxide semiconductor layer, and then dried, and thus, the electrolyte was disposed. 
     Next, a sealing portion forming body for forming a sealing portion was prepared. The sealing portion forming body was obtained by preparing one resin film for sealing formed of maleic anhydride-modified polyethylene (Product Name: Bynel, manufactured by DuPont), and by forming one quadrangular opening on the resin film for sealing. At this time, the sealing portion forming body was produced such that the opening had a dimension of 4.2 cm×9.7 cm×60 μm and the width of the sealing portion forming body was 1.8 mm. 
     Then, the sealing portion forming body was overlapped with the electrode structure described above, and then, the sealing portion forming body was heated and melted, and thus, was adhered onto the electrode structure described above. 
     Next, one counter substrate was prepared. One counter substrate was prepared by forming a catalytic layer formed of platinum, on a titanium foil of 4.6 cm×10.0 cm×40 μm, by a sputtering method. 
     Then, the sealing portion forming body adhered onto the electrode structure described above and the counter substrate were overlapped to face each other. Then, in such a state, the sealing portion forming body was heated and melted while being pressurized. Thus, the sealing portion was formed between the electrode structure and the counter substrate. 
     Thus, a photoelectric conversion cell was produced. 
     On the other hand, a touch sensor was prepared as described below. That is, first, a substrate formed of a PET film was prepared, and an electrode was formed in a region of 42 mm×97 mm on a surface of the substrate by screen printing. At this time, the electrode was formed such that a mesh wiring has a line width of 4 μm and a difference in transmittance of visible light between a portion passing through the mesh wiring and a portion passing through a portion other than the mesh wiring was 10%. In addition, from the electrode, a wiring was formed such that a line width was 10 μm. At this time, the wiring extended to a region of 0.3 mm from an edge portion of the substrate, and was formed to be disposed along the region from there. 
     Then, the substrate described above was covered with the covering layer formed of a PET film to cover the electrode. Thus, the touch sensor was obtained. 
     Then, the photoelectric conversion cell and the touch sensor obtained as described above were laminated on each other. At this time, the photoelectric conversion cell and the touch sensor were fixed to each other by allowing the circumferences to adhere to each other with an adhesive agent. In addition, at this time, the non-power generation portion was overlapped with the electrode of the touch sensor in the case of viewing the non-power generation portion in the thickness direction of the substrate of the touch sensor. Thus, an input device was produced. 
     Comparative Example 1 
     An input device was produced by the same method as that of Example 1, except that a precursor of an insulating portion containing glass frit and a coloring material was not formed on a transparent conductive layer, and a precursor of a covering portion was not formed to cover the entire precursor of the insulating portion, and thus, a non-power generation portion was not formed. 
     &lt;Evaluation of Durability&gt; 
     In the photoelectric conversion cells of the input devices obtained in Example 1 and Comparative Example 1, initial output (η 0 ) was measured. Subsequently, light was incident on the photoelectric conversion cells for 1000 hours, by using a light source of a white LED, and then, output (η) was measured. Then, a retention rate of the output (an output retention rate) was calculated on the basis of the following Expression: 
       Retention Rate of Output (%)=η/η 0 ×100.
 
     Results are shown in Table 1. 
     
       
         
           
               
               
               
             
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                 Presence or Absence 
                   
               
               
                   
                 of Non-Power 
                 Durability 
               
               
                   
                 Generation Portion 
                 Output Retention Rate (%) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                 Example 1 
                 Present 
                 99 
               
               
                 Comparative 
                 Absent 
                 77 
               
               
                 Example 1 
               
               
                   
               
            
           
         
       
     
     As shown in Table 1, it was found that the photoelectric conversion cell of Example 1 had a high output retention rate, compared to the photoelectric conversion cell of Comparative Example 1. 
     As described above, according to the invention, it was confirmed that it was possible to improve the durability of the photoelectric conversion cell, and to improve the durability of the input device. 
     EXPLANATIONS OF LETTERS OR NUMERALS 
     
         
         
           
               20  transparent electrode substrate 
               30  counter substrate 
               40  sealing portion 
               50  power generation portion 
               60  electrolyte 
               70  non-power generation portion 
               71  insulating portion 
               72  covering portion 
               100 ,  200  input device 
               120 ,  220  touch sensor 
               121  substrate 
               121   a  electrode 
               124  display unit 
               125  wiring 
               130  photoelectric conversion cell 
           
         
       
    
     Although the disclosure has been described with respect to only a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that various other embodiments may be devised without departing from the scope of the present invention. Accordingly, the scope of the invention should be limited only by the attached claims.