JP6724291B2 - Color filter and method of manufacturing color filter - Google Patents

Description

The present invention relates to a color filter capable of increasing the height of a connecting portion and simplifying the structure of the connecting portion.

In recent years, with the development of display devices, there is an increasing demand for flat panel displays such as liquid crystal display devices and organic EL display devices. Recently, in addition to televisions and personal computers, multifunctional terminals such as smartphones and tablet terminals have become popular, and the market for flat panel displays is expanding. Under such circumstances, there have been active studies on color filters constituting a flat display.

A general color filter usually has a transparent substrate, a light-shielding portion which is disposed on the transparent substrate and has an opening, and a patterned colored portion which is disposed in the opening of the light-shielding portion. As such a color filter, for example, there is a color filter in which a touch panel is integrated (for example, Patent Document 1), and in this case, metal wiring used as sensor wiring of the touch panel may be arranged in the color filter. is there. There are various methods of arranging the metal wiring, and for example, there is a method of arranging the metal wiring on the light shielding portion of the color filter. By disposing the metal wiring on the light shielding portion, it is possible to reduce the thickness of the liquid crystal display device having the color filter.

FIG. 7 is a schematic sectional view showing an example of a liquid crystal display device using a conventional color filter. As shown in FIG. 7, the display unit X includes a transparent substrate 1a, a light-shielding unit 2 disposed on the transparent substrate 1a and having an opening, and a patterned coloring unit disposed in the opening of the light-shielding unit 2 ( (Not shown), the metal wiring 3 arranged on the light shielding portion, the flattening layer 6 arranged on the colored portion and the metal wiring 3, the liquid crystal layer 8 arranged on the flattening layer 6, and the liquid crystal layer 8 and a transparent substrate 1b arranged on the upper surface. Further, the connecting portion Y includes the transparent substrate 1a, the light shielding layer 2 arranged on the transparent substrate 1a, the metal wiring 3 arranged on the light shielding layer 2, and the conductive particle layer arranged on the metal wiring 3. 7, a counter electrode 5 arranged on the conductive particle layer 7, and a transparent substrate 1b arranged on the counter electrode 5.

Here, a method for conducting electricity through the conductive particle layer will be described. As shown in FIG. 8, the conductive particle layer 7 is a layer in which the conductive particles 7a are dispersed in the resin 7b, and the conductive particles 7a are brought into conduction by coming into contact with the metal wiring 3 and the counter electrode 5. .. The conductive particle layer may be the same as that used in a general color filter, but for example, an anisotropic conductive adhesive film (ACF) or the like is used.

In the conventional color filter described above, as shown in FIG. 7, the distance through which the conductive particle layer 7 conducts corresponds to the distance between the metal wiring 3 and the counter electrode 5. Usually, the distance between the metal wiring and the counter electrode is determined according to the thickness of the liquid crystal layer in the display section and the like. That is, since the thickness of the conductive particle layer (particle diameter of the conductive particles) directly affects the thickness of the liquid crystal layer in the display section, etc., the conductive particle layer is changed depending on the thickness of the liquid crystal layer. It is necessary to adjust the thickness of. However, since the conductive particle layer has a desired thickness according to the particle diameter of the conductive particles contained therein, etc., the conductive particle layer is more conductive than the thickness determined according to the thickness of the liquid crystal layer in the display section. The thickness of the hydrophilic particle layer may be reduced.

JP, 2005-7945, A

As a method for solving the above-mentioned problem, for example, there is a method in which an overcoat layer is provided on the metal wiring in the connecting portion to increase the height of the connecting portion. However, when the overcoat layer is provided on the metal wiring in the connection portion, the metal wiring 3 is arranged on the light shielding layer 2 in the connection portion Y and an opening is formed on the metal wiring 3 as shown in FIG. The overcoat layer 9 is disposed, and the conductive pad 10 is disposed on the overcoat layer 9 so as to be in contact with the metal wiring 3 through the opening. That is, it is necessary to provide a conductive pad in addition to the overcoat layer, and there is a problem that the structure of the connecting portion becomes complicated. Also in the manufacturing process, an overcoat layer forming step of forming an overcoat layer, an opening forming step of forming an opening in the overcoat layer, and a conductive pad forming conductive pad so as to contact the metal wiring from the opening. Since it is necessary to perform the pad forming step, there is a problem that the manufacturing step and the layer structure become complicated.

The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a color filter capable of increasing the height of a connection portion and simplifying the configuration of the connection portion.

The inventors of the present invention have conducted earnest research to solve the above-mentioned problems, and as a result, the metal wiring arranged on the light-shielding layer in the connection portion was replaced with the conductive pad 10 in the conventional color filter shown in FIG. It has been found that the use of the above can increase the height of the connection portion and can simplify the configuration of the connection portion. The present invention has been completed based on such findings.

That is, the present invention is a transparent substrate, a display unit arranged on the transparent substrate, the same surface as the surface of the transparent substrate on which the display unit is arranged, and arranged in an area outside the display unit. And a display section, the display section being disposed on the transparent substrate, the light-shielding section having an opening, the patterned colored section disposed in the opening, and the light-shielding section being disposed on the transparent substrate. A color filter having metal wiring, wherein the connection portion is disposed on the transparent substrate, is formed of the same material as the light shielding portion, the light shielding layer, a base layer disposed on the light shielding layer, and There is provided a color filter having a conductive pad which is arranged on an underlayer and is formed continuously with the metal wiring.

According to the present invention, it is possible to increase the height of the connecting portion by disposing the underlayer on the connecting portion, and simplifying the structure of the connecting portion by using the metal wiring in the display portion as the conductive pad of the connecting portion. can do.

In the present invention, it is preferable that the base layer is made of the same material as the colored portion. This is because the colored portion and the base layer can be formed at the same time, so that the manufacturing process can be simplified.

In the present invention, the underlayer is preferably made of the same material as the light shielding layer and is integral with the light shielding layer. By integrally forming the light-shielding layer and the underlayer, the structure of the connecting portion can be further simplified, and since the light-shielding layer and the underlayer can be formed at the same time, the manufacturing process is simplified. Because you can do it.

The present invention provides a transparent substrate, a display unit arranged on the transparent substrate, and a connection unit arranged on the same surface as the surface of the transparent substrate on which the display unit is arranged and in an area outside the display unit. A method for manufacturing a color filter for manufacturing a color filter having: a light-shielding portion disposing step of disposing a light-shielding portion having an opening in the display portion, and a light-shielding layer disposing step of disposing a light-shielding layer at the connection portion at the same time. The step of arranging the light-shielding portion and the light-shielding layer, the step of arranging the colored portion having a pattern in the opening of the light-shielding portion disposed in the display portion, and the step of disposing the base layer on the light-shielding layer. A metal wiring and a conductive pad arranging step for simultaneously performing a base layer arranging step, a metal wiring arranging step for arranging a metal wiring on the light shielding part, and a conductive pad arranging step for arranging a conductive pad on the base layer. A method for manufacturing a color filter is provided.

According to the present invention, since the underlying layer arranging step is provided, the thickness of the connection portion can be increased to a desired height, and the metal wiring and the conductive pad performing the metal wiring arranging step and the conductive pad arranging step at the same time. By having the pad placement step, the manufacturing process can be simplified.

In the present invention, it is preferable that the underlying layer is made of the same material as the colored portion, and the underlying layer arranging step is performed simultaneously with the colored portion arranging step. This is because the manufacturing process can be further simplified and the manufacturing cost can be reduced.

In the present invention, it is preferable that the underlying layer is made of the same material as the light shielding layer, and the underlying layer disposing step is performed simultaneously with the light shielding layer disposing step. This is because the manufacturing process can be further simplified and the manufacturing cost can be reduced.

INDUSTRIAL APPLICABILITY The present invention has an effect that it is possible to make a color filter capable of increasing the height of the connection portion and simplifying the configuration of the connection portion.

It is a schematic sectional drawing which shows an example of the color filter of this invention. It is a schematic perspective view for explaining the display part in the color filter of the present invention. It is a schematic sectional drawing which shows an example of the liquid crystal display device using the color filter of this invention. It is explanatory drawing for demonstrating the base layer in this invention. It is a schematic sectional drawing which shows the other example of the color filter of this invention. It is a schematic process drawing which shows an example of the manufacturing method of the color filter of this invention. It is a schematic sectional drawing which shows an example of the conventional color filter. It is an explanatory view for explaining a conductive particle layer. It is a schematic sectional drawing which shows the other example of the conventional color filter.

Hereinafter, the color filter of the present invention and the method of manufacturing the color filter will be described.

A. Color Filter The color filter of the present invention includes a transparent substrate, a display unit disposed on the transparent substrate, a surface of the transparent substrate on which the display unit is disposed, and a region outside the display unit. And a display portion, which is disposed on the transparent substrate, and has a light-shielding portion having an opening, a patterned colored portion disposed in the opening, and the light-shielding portion. A color filter having disposed metal wirings, wherein the connecting portion is disposed on the transparent substrate and is made of the same material as the light shielding portion, and the light shielding layer, and a base layer disposed on the light shielding layer. , And a conductive pad disposed on the base layer and continuous with the metal wiring.

Here, the above-mentioned "consecutively configured" means that it is configured as a single member without interruption. Therefore, in the present invention, the metal wiring in the display portion and the conductive pad in the connection portion are formed as a single member.

The color filter of the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of the color filter of the present invention. Further, FIG. 2 is a schematic perspective view for explaining a display unit in the color filter of the present invention. As shown in FIG. 1, the color filter 100 of the present invention includes a transparent substrate 1a, a display unit X disposed on the transparent substrate 1a, and a surface of the transparent substrate 1a on which the display unit X is disposed, Further, it has a connecting portion Y arranged in a region outside the display portion X. Further, in the present invention, as shown in FIGS. 1 and 2, the display portion X is arranged on the transparent substrate 1a, the light shielding portion 2 having the opening portion 12, and the pattern-shaped coloring arranged in the opening portion 12 are provided. The portion 11 (here, the red colored portion 11R, the green colored portion 11G, the blue colored portion 11B) and the metal wiring 3 arranged on the light shielding portion 2 are provided. Further, in the present invention, as shown in FIG. 1, the connection portion Y has the light shielding layer 2 arranged on the transparent substrate 1a, the base layer 4 arranged on the light shielding layer 2, and the base layer 4. The conductive pad 10 is formed. Furthermore, in the present invention, the light shielding portion in the display portion and the light shielding layer in the connection portion are made of the same material, and the metal wiring in the display portion and the conductive pad in the connection portion are continuously formed. The display unit X in FIG. 1 is a cross-sectional view taken along the line AA of the display unit X shown in FIG.

Further, FIG. 3 is a schematic cross-sectional view showing an example of a liquid crystal display device using the color filter of the present invention. Note that the color filter of FIG. 3 is the same as the color filter of FIG. 1 described above, and therefore description thereof is omitted here. Further, the other reference numerals in FIG. 3 are the same as those in FIGS. 7 and 8 described above, and thus the description thereof is omitted here.

According to the present invention, it is possible to increase the height of the connecting portion by disposing the underlayer on the connecting portion, and simplifying the structure of the connecting portion by using the metal wiring in the display portion as the conductive pad of the connecting portion. can do.
In the conventional color filter, as shown in FIG. 9, the overcoat layer 9 is arranged in order to increase the height of the connection portion Y. Therefore, it is necessary to form a predetermined opening in the overcoat layer 9 and provide the conductive pad 10 so as to contact the metal wiring 3 through the opening. In such a conventional color filter, it is possible to raise the height of the connection portion, but there is a problem that the configuration of the connection portion becomes complicated.
On the other hand, in the present invention, as shown in FIG. 1, a base layer for increasing the height of the connection portion is provided, and further, metal wiring is arranged on the base layer and used as the conductive pad 10. Therefore, in the present invention, it is possible to increase the height of the connection portion and to simplify the configuration of the connection portion as compared with the conventional color filter described above.

Hereinafter, each component of the color filter of the present invention will be described.

1. Connection Section The connection section in the present invention is arranged on the same surface as the surface of the transparent substrate on which the display section described later is arranged. Further, the connecting portion is arranged on the transparent substrate and is formed of the same material as that of the light shielding portion, a light shielding layer, a base layer arranged on the light shielding layer, and a base layer, and is formed continuously with the metal wiring. Has a conductive pad formed therein.

The connection portion in the present invention corresponds to the non-display area of the color filter. Here, the “non-display area” refers to an area arranged on the outer periphery of the display area, that is, an area outside the display unit described later. Further, when the color filter of the present invention is used in a liquid crystal display device or the like, it becomes an inactive area.
Hereinafter, the light-shielding layer, the base layer, and the conductive pads that form the connection portion will be described.

(1) Light-shielding layer The light-shielding layer in the present invention is a member that is disposed on the transparent substrate and is made of the same material as the light-shielding portion. Therefore, in the present invention, the light shielding layer may be formed continuously with the light shielding portion described later. Here, the term “continuously configured” means that the member is configured as a single member without interruption.

The material of the light shielding layer may be the same as the material used for the light shielding layer in a general color filter. For example, a metal thin film containing a chromium compound may be used, or a black color material dispersed or dissolved in a binder resin may be used. Examples of the material of the light-shielding layer include the material of the light-shielding layer described in JP-A-2008-90191.

The thickness of the light shielding layer is not particularly limited as long as it has a desired light shielding property. The specific thickness of the light shielding layer is, for example, preferably in the range of 0.5 μm to 5.0 μm, particularly preferably in the range of 0.7 μm to 4.0 μm, and particularly 1.0 μm. It is preferably in the range of to 3.0 μm.

(2) Underlayer The underlayer in the present invention is a member arranged on the light-shielding layer described later.

The material of the underlayer in the present invention is not particularly limited as long as it can be used for a color filter and can raise the height of the connection portion, but preferably has a predetermined elasticity. When the underlayer has a predetermined elasticity, it is included in the conductive particle layer 7 when the conductive particle layer 7 is provided on the conductive pad 10 to establish conduction with the counter electrode 5, as shown in FIG. 3, for example. This is because the contact area between the conductive particles and the conductive pad 10 can be increased and stable conduction can be achieved. The reason is that, as shown in FIG. 4, when the underlying layer 4 has a predetermined elasticity, the conductive particles 7 a included in the conductive particle layer 7 form the underlying layer 4 and the conductive pad 10 disposed on the underlying layer. It is conceivable that the contact area between the conductive particles 7a and the conductive pads 10 increases due to the bending of the conductive particles.

As a material for such an underlayer, a resin material, the same material as the colored portion, the same material as the light shielding layer, or the like can be used. The material of the colored portion will be described later, but from the viewpoint of imparting a predetermined elasticity to the underlayer, it is preferable to use the resin material or the same material as the colored portion as the material of the underlayer. By using the resin material or the same material as the colored portion containing the resin material as the main component, the content of the resin in the underlayer can be increased, and thus desired elasticity can be imparted. Further, from the viewpoint of simplifying the configuration of the connecting portion, it is preferable to use the same material as the light shielding layer as the material of the underlayer. Further, from the viewpoint of simplifying the manufacturing process when manufacturing the color filter of the present invention, it is preferable to use the same material for the underlayer as the light shielding layer or the colored portion. This is because it is not necessary to separately provide the step of disposing the base layer. Note that a specific resin material can be similar to the resin material used for a general color filter, and a light-blocking layer and a coloring portion can be similar to the materials described in each section. Therefore, the description here is omitted.

Here, a case where the base layer is made of the same material as the light shielding layer or the colored portion will be described. FIG. 5A is a schematic cross-sectional view showing an example of a color filter in which the underlayer is made of the same material as the light shielding layer. In the present invention, as shown in FIG. 5A, it is preferable that the underlayer 4 is made of the same material as the light shielding layer 2 described above. Further, FIG. 5B is a schematic cross-sectional view showing an example of a color filter in which the base layer is made of the same material as the colored portion. In the present invention, as shown in FIG. 5B, the underlayer 4 is preferably made of the same material as the colored portion 11 (here, the red colored portion 11R) described later. When the base layer is made of the same material as the colored portion 11, the base layer may be made up of only one type of colored portion, or may be made up of two or more types of colored portions. The material of the light-shielding layer is the same as that described in the above section “(1) Light-shielding layer”, and the material of the colored portion is described later in “2. Display section (2) Colored section”. Since the contents can be the same as those described in, the description here is omitted.

The thickness of the underlayer in the present invention is appropriately adjusted, for example, according to the thickness of a conductive particle layer arranged on a conductive pad described later when manufacturing a liquid crystal display device or the like using the color filter of the present invention. It That is, when a liquid crystal display device or the like is manufactured using the color filter of the present invention, it is appropriately adjusted according to the thickness of the liquid crystal layer arranged in the display section and the like. The specific thickness of the underlayer is, for example, preferably in the range of 0.5 μm to 5.0 μm, particularly preferably in the range of 0.6 μm to 4.7 μm, and particularly preferably 0.7 μm to It is preferably in the range of 4.5 μm. When the thickness of the underlayer is within the above range, for example, when the color filter of the present invention is used in a liquid crystal display device or the like, the connecting portion is increased according to the thickness of the conductive particle layer disposed on the conductive pad. Can be satisfactorily performed. The thickness of the underlayer here is the distance indicated by t in FIG. When the underlayer is made of the same material as the light-shielding layer, the distance is the thickness of the underlayer and the light-shielding layer minus the thickness of the light-shielding portion in the display section, as indicated by t in FIG. 5A. ..

In the present invention, the underlayer may be composed of one layer or plural layers. When the base layer is composed of a plurality of layers, the base layer may be composed of each layer containing the same material as each colored part of a plurality of colors, and the layer containing the same material as the light shielding layer, and the colored part. It may be composed of layers containing the same material. In this case, since it is not necessary to separately provide a step of disposing the underlayer, the manufacturing process can be simplified.

(3) Conductive Pad The conductive pad in the present invention is a member that is arranged on the underlayer and is formed continuously with the metal wiring described later.

The material of the conductive pad in the present invention is not particularly limited as long as it is a conductive material that can be used as the same material as the metal wiring. Specific examples of the material of the conductive pad include simple substances of silver, gold, chromium, platinum, aluminum, and alloys containing any of these as a main component. As the metal alloy, an alloy of silver, palladium, and copper called APC is generally used. Further, as the metal composite, a three-layer structure of molybdenum, aluminum, molybdenum referred to as MAM or the like can be applied. Further, a conductive polymer obtained by adding the above metal to a resin material such as PEDOT can also be used.

As the material of the conductive pad in the present invention, it is preferable to use a material that is difficult to oxidize and sulfurize. This is because when the color filter of the present invention is used in a liquid crystal display device or the like, the conductive pad 10 may be exposed as shown in FIG. 3, for example. From such a viewpoint, in the present invention, it is preferable to use, for example, a copper-based material as the material of the conductive pad. Further, by using a copper-based material for the material of the conductive pad, it is possible to suppress the resistance to a low value and reduce the power consumption. Here, the copper-based material refers to copper or a copper alloy containing copper as a main component.

The conductive pad in the present invention may be composed of one layer or may be composed of two or more layers, but it is usually composed of one layer. When the conductive pad is composed of two or more layers, it is preferable that the outermost layer contains a conductive material that is difficult to oxidize and sulfurize. Specifically, the layer arranged on the outermost surface is, for example, a layer containing indium tin oxide (ITO) or indium zinc oxide (IZO), a layer containing an alloy containing copper, nickel, manganese and zinc, or CuN. It is preferable to use a layer containing This is because when the color filter of the present invention is used in a liquid crystal display device or the like, it is possible to prevent the conductive pad from being exposed to be oxidized and sulfurized. Further, when the conductive pad is composed of two or more layers, it is preferable to use a laminated body in which two or more layers containing a metal are laminated. In this case, the same material as the metal wiring may be used, and at least one continuous layer may be included. Examples of the combination (lower layer/upper layer) of the laminate used for the conductive pad include APC/ITO, APC/IZO, Cu/alloy (Cu, Ni, Mn, Zn), Cu/CuN, and the like. When the above-mentioned laminated body is used, a conductive pad can be produced by forming a layer containing two or more layers of metal in a manufacturing process and then performing etching once.

As the thickness of the conductive pad in the present invention, for example, when the color filter of the present invention is used in a liquid crystal display device or the like, it is possible to electrically connect the conductive pad to the counter electrode through a conductive layer such as a conductive particle layer. The thickness is not particularly limited as long as it is as thick as possible. For example, the thickness is preferably in the range of 10 nm to 1000 nm, more preferably in the range of 50 nm to 800 nm, and particularly preferably in the range of 100 nm to 200 nm. When the thickness of the conductive pad is smaller than the above range, the resistance of the conductive pad becomes large and there is a possibility that the conductive pad does not function sufficiently. If the thickness of the conductive pad is larger than the above range, the time and cost for forming the conductive pad by vapor deposition or the like may increase.

2. Display Section The display section in the present invention is arranged on a transparent substrate. Further, the display section is disposed on the transparent substrate and has a light shielding section having an opening, a patterned colored section disposed in the opening, and a metal wiring disposed on the light shielding section.

The display unit in the present invention corresponds to the display area of the color filter. Here, the "display area" means an area used for image display when the color filter of the present invention is used in a liquid crystal display device or the like. That is, the display unit in the present invention becomes an active area.
Hereinafter, the light-shielding portion, the coloring portion, and the metal wiring that form the display portion will be described.

(1) Light-shielding portion The light-shielding portion in the present invention is a member that is arranged on a transparent substrate and has an opening, and is also a member that is made of the same material as the light-shielding layer. Therefore, in the present invention, the light shielding portion may be formed continuously with the light shielding layer described above. Here, the term “continuously configured” means that the member is configured as a single member without interruption.

The light-shielding portion in the present invention has a predetermined opening, and the opening defines the pixel. The shape of the opening in the light shielding portion may be the same as that of the light shielding portion in a general color filter, and examples thereof include a stripe shape, a dogleg shape, and a delta arrangement.

The line width of the light-shielding portion can be appropriately selected according to the application of the color filter of the present invention and is not particularly limited, but for example, preferably in the range of 1 μm to 30 μm, and particularly 1.5 μm to 28 μm. Is preferably within the range, and particularly preferably within the range of 2 μm to 25 μm. If the line width of the light shielding portion is smaller than the above range, it may be difficult to sufficiently define pixels using the light shielding portion. Further, when the line width of the light shielding portion is larger than the above range, there is a possibility that the color filter of the present invention cannot be made finer. Here, the "line width of the light shielding portion" means, for example, the distances indicated by W1 and W2 in FIG. When the line widths of the light-shielding portions have different line widths W1 and W2, they are usually adjusted so that they are included in the above numerical range.

The material of the light-shielding portion can be the same as the material of the light-shielding layer described above, and thus the description thereof is omitted here.

The thickness of the light-shielding portion is not particularly limited as long as it has a desired light-shielding property, and may be, for example, about 0.5 μm to 3.0 μm.

(2) Colored part The colored part in the present invention is a patterned member arranged in the opening of the light shielding part.

The colored portion has, for example, three colored portions of red, green, and blue. The color of the colored portion may include at least three colors of red, green and blue. For example, three colors of red, green and blue, four colors of red, green, blue and yellow, or red, It is also possible to use five colors such as green, blue, yellow, and cyan.

As the coloring portion, for example, a coloring material dispersed in a binder resin can be used.
Examples of the coloring material used in the colored portion include pigments and dyes of each color. Examples of the coloring material used in the red colored layer include perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments, anthracene pigments, and isoindoline pigments. Examples of the coloring material used in the green colored layer include phthalocyanine-based pigments such as halogen poly-substituted phthalocyanine pigments or halogen poly-substituted copper phthalocyanine pigments, triphenylmethane-based basic dyes, isoindoline-based pigments, isoindolin. Examples thereof include linone-based pigments. Furthermore, examples of the coloring material used in the blue colored layer include copper phthalocyanine pigments, anthraquinone pigments, indanthrene pigments, indophenol pigments, cyanine pigments, and dioxazine pigments. These pigments and dyes may be used alone or in combination of two or more. Examples of the binder resin used in the colored portion include a photosensitive resin having a reactive vinyl group such as an acrylate type, a methacrylate type, a polyvinyl cinnamate type, or a cyclized rubber type.

In the colored portion, in addition to the above-mentioned materials, if necessary, a photopolymerization initiator, a sensitizer, a coatability improver, a development improver, a crosslinking agent, a polymerization inhibitor, a plasticizer, a flame retardant, etc. Can be included.

Further, a white layer containing no binder and containing a binder resin may be formed on the same plane where the colored portion is formed.

The arrangement of the colored portions is not particularly limited, and may be a known arrangement such as a stripe type, a mosaic type, a triangle type, and a 4-pixel arrangement type.

The thickness of the colored portion can be the same as the thickness of a general colored portion in the color filter, and can be set within a range of 1 μm to 5 μm, for example.

(3) Metal Wiring The metal wiring in the present invention is a member arranged on the light shielding portion. Further, the metal wiring in the present invention is a member that is continuously formed with the above-mentioned conductive pad.

The metal wiring in the present invention is, for example, a member used as a wiring for a sensor when the color filter of the present invention and the touch panel are integrated. The material used for the metal wiring can be the same as the material for the above-described conductive pad, and thus the description thereof is omitted here.

The thickness of the metal wiring in the present invention is not particularly limited as long as it has a desired conductivity. For example, the thickness is preferably in the range of 10 nm to 1000 nm, more preferably in the range of 50 nm to 800 nm, and particularly preferably in the range of 100 nm to 200 nm. When the thickness of the metal wiring is within the above range, peeling or cracking of the metal wiring can be suppressed, and a desired function can be exhibited.

Further, the line width of the metal wiring in the present invention is not particularly limited as long as it can be arranged on the light shielding part. For example, it is preferably in the range of 1.0 μm to 28 μm, particularly preferably in the range of 1.5 μm to 23 μm, and particularly preferably in the range of 2.0 μm to 20 μm. When the line width of the metal wiring is within the above range, the metal wiring can be arranged on the light-shielding portion, so that the influence on the visibility of the color filter of the present invention can be suppressed, and the peeling or cracking of the metal wiring can be suppressed. Can be suppressed and a desired function can be exhibited. Here, the “line width of the metal wiring” means, for example, the distance indicated by W3 in FIG.

3. Transparent Substrate The transparent substrate in the present invention is a member that supports each member constituting the color filter of the present invention.

The material of the transparent substrate in the present invention is not particularly limited as long as it is a material used for general color filters. For example, a non-flexible inorganic substrate such as quartz glass, Pyrex (registered trademark) glass, or synthetic quartz plate. , And a flexible resin substrate such as a transparent resin film or an optical resin plate. Above all, an inorganic substrate is preferably used, and among the inorganic substrates, a glass substrate is preferably used. Furthermore, it is preferable to use a non-alkali type glass substrate among the glass substrates. This is because a non-alkali type glass substrate is excellent in dimensional stability and workability in high-temperature heat treatment, and since it does not contain an alkali component in the glass, it is suitable for a color filter used in a liquid crystal display device or the like. ..

Here, unless otherwise specified, the term “transparent” refers to a degree of transparency that does not prevent an operator of a liquid crystal display device or the like using the color filter of the present invention from seeing the operation surface. .. Therefore, “transparent” includes colorless and transparent and colored transparent to the extent that visibility is not hindered, and is not defined by strict transmittance, and the degree of transmittance is determined according to the application of the color filter of the present invention. can do.

The thickness of the transparent substrate in the present invention is not particularly limited as long as it is a thickness that can support each member, and can be appropriately designed according to the application of the color filter of the present invention. Since the specific thickness of the transparent substrate can be the same as the thickness of the substrate generally used for the color filter, the description thereof is omitted here.

4. Others In addition to the above-described configuration, the color filter of the present invention may have other configurations as necessary. Examples of other configurations include an overcoat layer.

The overcoat layer used in the present invention is arranged so as to cover the light shielding part, the coloring layer and the metal wiring in the display part. Since the color filter of the present invention has the overcoat layer, the surface of the color filter can be flattened and the visibility can be improved when the color filter is used in a liquid crystal display device or the like.

The material of the overcoat layer can be the same as that of the overcoat layer used for a general color filter, and either an organic material or an inorganic material can be used. When the overcoat layer is made of an inorganic material, it is possible to impart barrier properties. Note that the specific material of the overcoat layer can be the same as the material disclosed in, for example, Japanese Patent Laid-Open No. 2014-186641, so description thereof will be omitted here.

5. Applications The color filter of the present invention can be used for various display devices, and among them, it can be used for a display device with a touch panel, specifically, a liquid crystal display device with a touch panel, an organic EL display device with a touch panel, and the like.

B. Method for producing color filter The method for producing a color filter according to the present invention includes a transparent substrate, a display unit disposed on the transparent substrate, and a surface of the transparent substrate on which the display unit is disposed, and the display. A method of manufacturing a color filter having a connecting portion arranged in a region outside a portion, which is a light shielding portion disposing step of disposing a light shielding portion having an opening in the display portion, and the connecting portion. A light-shielding portion and a light-shielding layer arranging step for simultaneously performing a light-shielding layer arranging step for arranging a light-shielding layer, and a colored portion arranging step for arranging a patterned colored portion in the opening of the light-shielding portion arranged in the display portion. And simultaneously performing an underlayer arranging step of arranging an underlayer on the light shielding layer, a metal wiring arranging step of arranging metal wiring on the light shielding part, and a conductive pad arranging step of arranging a conductive pad on the underlayer. And a metal wiring and conductive pad arranging step.

A method for manufacturing the color filter of the present invention will be described with reference to the drawings. FIG. 6 is a schematic process drawing showing an example of the method for manufacturing a color filter of the present invention. In FIG. 6, the left view of the broken line is a schematic cross-sectional view of the display unit and the connection unit in the color filter, and the right view of the broken line is a schematic plan view of the display unit in the left view observed from a plane. Specifically, the display portion of the left figure of the broken line corresponds to the sectional view taken along the line BB in the right figure of the broken line.

As shown in FIGS. 6A to 6D, the method of manufacturing a color filter according to the present invention is arranged on the same surface as the display section X on the transparent substrate 1a and the display section X of the transparent substrate 1a. And a method of manufacturing the color filter 100 having the connection portion Y arranged in the region outside the display unit X. Specifically, as shown in FIG. 6A, a light-shielding portion disposing step of disposing the light-shielding portion 2 having the opening 12 in the display portion X and a light-shielding layer disposing step of disposing the light shielding layer 2 in the connection portion Y. The step of arranging the light-shielding portion and the light-shielding layer is performed simultaneously. Next, as shown in FIG. 6B, the patterned colored portion 11 (here, the red colored portion 11R, the green colored portion 11G, and the blue portion) is provided in the opening 12 of the light shielding portion 2 arranged in the display portion X. There is a coloring portion arranging step of arranging the coloring portion 11B). Next, as shown in FIG. 6C, there is a base layer disposing step of disposing the base layer 4 on the light shielding layer 2 of the connection portion Y. Finally, as shown in FIG. 6D, the metal wiring arranging step of arranging the metal wiring 3 on the light shielding portion 2 of the display portion X, and the conductive pad 10 on the base layer 4 of the connection portion Y. And a conductive pad arranging step for simultaneously performing the conductive pad arranging step.

In the present invention, as shown in FIGS. 6A to 6D, the color filter is arranged in the order of the light-shielding portion/light-shielding layer arranging step, the coloring portion arranging step, the base layer arranging step, the metal wiring and the conductive pad arranging step. However, the underlying layer arranging step may be performed before the colored portion arranging step. In addition, the underlying layer arranging step may be performed simultaneously with at least one of the colored portion arranging step and the metal wiring and conductive pad arranging step.

According to the present invention, since the underlying layer arranging step is provided, the thickness of the connection portion can be increased to a desired height, and the metal wiring and the conductive pad performing the metal wiring arranging step and the conductive pad arranging step at the same time. By having the pad placement step, the manufacturing process can be simplified. The description of the specific effects of the present invention can be made in the same manner as the content described in the above section "A. Color filter", and therefore the description thereof is omitted here.
Hereinafter, each step included in the method for manufacturing a color filter of the present invention will be described.

1. Light-shielding portion and light-shielding layer arranging step The light-shielding portion and light-shielding layer arranging step in the present invention include a light-shielding portion arranging step of arranging a light-shielding portion having an opening in a display portion and a light-shielding layer arranging step of arranging a light shielding layer in a connecting portion. This is a process performed at the same time. Since the light-shielding portion and the light-shielding layer are the same as those described in the above section "A. Color filter", description thereof is omitted here.

The light-shielding portion/light-shielding layer arranging step in the present invention is not particularly limited as long as it is a step of disposing the light-shielding portion and the light-shielding layer on the display portion and the connection portion of the transparent substrate. The light shielding portion and the light shielding layer obtained in this step are made of the same material.
As a specific light-shielding portion and light-shielding layer arranging step, for example, a constituent material of the light-shielding portion and the light-shielding layer is formed in the display portion and the connection portion of the transparent substrate, and then the light-shielding portion is patterned to form a predetermined opening. There is a method of doing. Examples of the method for forming the constituent material of the light shielding portion and the light shielding layer on the display portion and the connection portion of the transparent substrate include a sputtering method, a vacuum vapor deposition method, a coating method and the like. Further, as a method of forming the predetermined opening in the light shielding part, for example, a method of etching by photolithography can be mentioned.

2. Colored portion arranging step The colored portion arranging step in the present invention is a step of arranging a patterned colored portion in the opening of the light shielding portion. The coloring portion is the same as the content described in the above section "A. Color filter", and thus the description thereof is omitted here.

The colored portion arranging step in the present invention is not particularly limited as long as it is a step capable of arranging the patterned colored portion in the opening of the light shielding portion. In the coloring portion arranging step, the constituent material of the coloring portion may be arranged in a pattern in each opening. For example, as shown in FIG. 6B, the constituent material of the coloring portion is formed into a plurality of openings. It may be arranged in a strip shape. Specific examples of the method of forming the colored portion include a photolithography method, an inkjet method, a printing method, and the like.

3. Base Layer Disposing Step The base layer disposing step in the present invention is a step of disposing the base layer on the light shielding layer. The base layer is the same as the content described in the above section “A. Color filter”, and therefore the description thereof is omitted here.

The step of disposing the underlayer in the present invention is not particularly limited as long as it is a step of disposing the underlayer on the light shielding layer. Specific examples of the method for forming the underlayer include a photolithography method, an inkjet method, a printing method, and the like.

The underlying layer arranging step in the present invention is preferably performed at the same time as the above-mentioned colored portion arranging step. Specifically, the step shown in FIG. 6B and the step shown in FIG. 6C are performed at the same time, and the base layer is made of the same material as the material forming the colored portion. By performing the base layer arranging step at the same time as the colored portion arranging step, the color filter manufacturing method of the present invention can be further simplified.

Further, it is preferable that the underlying layer arranging step in the present invention is performed at the same time as the above-mentioned light shielding layer arranging step. Specifically, in the step shown in FIG. 6A, the thickness of the light shielding layer is increased by using a halftone mask or the like, and the light shielding layer 2 and the underlying layer 4 are made of the same member as shown in FIG. 5A. And By performing the base layer arranging step at the same time as the light shielding layer arranging step, it becomes possible to further simplify the color filter manufacturing method of the present invention.

Further, the underlying layer arranging step in the present invention may be a step which is performed at the same time as the above-mentioned light-shielding layer arranging step and at the same time as the above-mentioned colored portion arranging step. Specifically, the thickness of the light-shielding layer may be increased using a halftone mask or the like, and a base layer may be formed on the light-shielding layer using the same material as the material forming the colored portion. By performing the base layer arranging step at the same time as the light shielding layer arranging step and the colored portion arranging step, it is possible to further simplify the manufacturing method of the color filter of the present invention.

4. Metal Wiring and Conductive Pad Arranging Step In the metal wiring and conductive pad arranging step of the present invention, the metal wiring arranging step of arranging the metal wiring on the light shielding portion and the conductive pad arranging step of arranging the conductive pad on the underlying layer are simultaneously performed. It is a process.

The metal wiring and conductive pad arranging step in the present invention is not particularly limited as long as the metal wiring can be arranged on the light shielding portion and the conductive pad can be arranged on the underlying layer. The metal wiring and the conductive pad obtained in this step are made of the same material.
As a specific metal wiring and conductive pad arranging step, for example, the constituent materials of the metal wiring and the conductive pad are formed on the display portion and the connection portion, and then the constituent material of the metal wiring formed on the display portion is changed. A method of forming a metal wiring having a predetermined line width on the light shielding portion by performing positive type etching on the layer to be formed is mentioned. On the other hand, in the connection portion, a method of depositing the constituent material of the conductive pad on the underlying layer of the connection portion can be mentioned as in the method of depositing the constituent material of the metal wiring on the front surface of the display portion. Examples of a method for forming a film of the constituent material of the metal wiring (conductive pad) include a vacuum vapor deposition method and a sputtering method.

5. Other Steps The method for manufacturing a color filter of the present invention only needs to have at least the steps described above, and may have other steps as necessary. Other processes include, for example, an overcoat layer arranging process of arranging an overcoat layer so as to cover the light shielding part of the display part, the colored part and the metal wiring after the metal wiring and conductive pad arranging process. The specific method of arranging the overcoat layer can be the same as the method of arranging the overcoat layer used for a general color filter, and thus the description thereof is omitted here.

The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, has substantially the same configuration as the technical idea described in the scope of the claims of the present invention, and any one having the same operational effect is the present invention. It is included in the technical scope of the invention.

Hereinafter, the present invention will be described with reference to examples.

[Example]
(Preparation of transparent substrate)
As the transparent substrate, a glass substrate having a size of 730 mm×920 mm and a thickness of 0.7 mm was prepared.

(Step of arranging light shielding part and light shielding layer)
(Preparation of copolymer resin composition)
First, 63 parts by mass of methyl methacrylate (MMA), 12 parts by mass of acrylic acid (AA), 6 parts by mass of 2-hydroxyethyl methacrylate (HEMA), and 88 parts by mass of diethylene glycol dimethyl ether (DMDG) in a polymerization tank. After parts were mixed and stirred and dissolved, 7 parts by mass of 2,2′-azobis(2-methylbutyronitrile) was added and uniformly dissolved.
Then, the mixture was stirred at 85°C for 2 hours under a nitrogen stream, and further reacted at 100°C for 1 hour.
To the resulting solution, 7 parts by mass of glycidyl methacrylate (GMA), 0.4 parts by mass of triethylamine, and 0.2 parts by mass of hydroquinone were added, and the mixture was stirred at 100° C. for 5 hours to prepare a copolymer resin solution ( Solid content 50%) was obtained.

Next, the following materials were stirred and mixed at room temperature to prepare a curable resin composition A having the following composition.
<Composition of curable resin composition A>
-The above-mentioned copolymer resin solution (solid content 50%) ... 16 parts by mass-Dipentaerythritol pentaacrylate (SR399, Sartomer Co.)
24 parts by mass Orthocresol novolac type epoxy resin (Epicoat 180S70 manufactured by Yuka Shell Epoxy Co., Ltd.) 4 parts by mass 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one
...4 parts by mass diethylene glycol dimethyl ether ...52 parts by mass

Next, the following components were mixed and sufficiently dispersed by a sand mill to prepare a black pigment dispersion liquid.
<Composition of black pigment dispersion>
・Black pigment (#2600 manufactured by Mitsubishi Chemical Co., Ltd.) 20 parts by mass Polymer dispersion material (Big Chemie Japan Co., Ltd. Disperbyk 111)
16 parts by mass solvent (diethylene glycol dimethyl ether) 64 parts by mass

Then, the following components were sufficiently mixed to obtain a composition for forming a light shielding part and a light shielding layer.
<Composition of composition for forming light-shielding portion and light-shielding layer>
-The above black pigment dispersion ... 50 parts by mass- The above curable resin composition A ... 20 parts by mass-Diethylene glycol dimethyl ether ... 30 parts by mass

Next, the obtained light-shielding portion and the composition for forming a light-shielding layer are applied to the display portion and the connection portion of the transparent substrate, the display portion is patterned by the photolithography method, and then baked to form the light-shielding portion in the display portion and the connection portion. And a light shielding layer was formed.

(Colored part placement process)
Then, the following components were sufficiently mixed to obtain a composition for forming a red colored portion, a composition for forming a green colored portion, and a composition for forming a blue colored portion.

<Composition for forming red colored portion>
C. I. Pigment Red 254: 10 parts by mass, polysulfonic acid type polymer dispersant: 8 parts by mass, the curable resin composition A: 15 parts by mass, 3-methoxybutyl acetate-67 parts by mass.

<Composition for forming green colored portion>
C. I. Pigment Green 58... 10 parts by mass C.I. I. Pigment Yellow 138: 3 parts by mass, polysulfonic acid type polymer dispersant: 8 parts by mass, the curable resin composition A: 12 parts by mass, acetic acid-3-methoxybutyl: 67 parts by mass

<Blue colored portion forming composition>
C. I. Pigment Blue 1... 5 parts by mass, polysulfonic acid type polymer dispersant... 3 parts by mass, the curable resin composition A... 25 parts by mass, acetic acid-3-methoxybutyl... 67 parts by mass.

Next, the composition for forming a red colored portion was applied by a spin coating method so as to cover the light shielding portion formed in the display portion, patterned by a photolithography method, and then baked to form a red colored portion.
Next, the green colored portion and the blue colored portion were formed by the same operation using the green colored portion forming composition and the blue colored portion forming composition. As a result, a colored portion in which the red colored portion, the green colored portion, and the blue colored portion were arranged was formed.
The thickness of each colored portion was 1.5 μm.

(Underlayer placement process)
The following components were sufficiently mixed to obtain a composition for forming an underlayer.
-The above curable resin composition A ... 60 parts by mass-Diethylene glycol dimethyl ether ... 40 parts by mass

Next, the obtained underlayer-forming composition was applied onto the light-shielding layer formed in the connection portion, patterned by a photolithography method, and then baked to form an underlayer having a thickness of 3 μm.

(Metal wiring and conductive pad placement process)
Then, an Ag thin film having a thickness of 0.2 μm was formed on the display portion and the connection portion by using a vapor deposition method. After that, patterning was performed using a positive resist, and etching was performed with phosphorous nitric acid acetic acid. As a result, desired metal wirings and conductive pads were formed on the light-shielding portion in the display portion and the light-shielding layer in the connection portion.

(Overcoat layer placement process)
The following components were thoroughly mixed to obtain a composition for forming an overcoat layer.
-The above curable resin composition A ... 60 parts by mass-Diethylene glycol dimethyl ether ... 40 parts by mass

Next, the obtained composition for forming an overcoat layer was applied onto the display portion and then dried to form an overcoat layer on the display portion.

[Evaluation]
According to the present invention, the layer structure of the connecting portion and the manufacturing process can be simplified. Further, when a continuity test was conducted on the obtained color filter, the same conductivity as that of the conventional color filter was obtained.

1a, 1b... Transparent substrate 2... Light-shielding portion, light-shielding layer 3... Metal wiring 4... Underlayer 10... Conductive pad 100... Color filter X... Display portion Y... Connection portion

Claims (6)

A transparent substrate, a display unit arranged on the transparent substrate, and a connection unit arranged on the same surface as the surface of the transparent substrate on which the display unit is arranged and in an area outside the display unit. Then
The display unit is a color filter that is disposed on the transparent substrate and has a light-shielding unit having an opening, a patterned coloring unit disposed in the opening, and a metal wiring disposed on the light-shielding unit. hand,
The color filter is integrated with a touch panel,
The connection portion is disposed on the transparent substrate, is formed of the same material as the light shielding portion, the light shielding layer, a base layer disposed on the light shielding layer, and the metal wiring is disposed on the base layer. Has a conductive pad formed continuously with
The metal wiring is a member used as the sensor wiring of the touch panel,
The metal wiring is composed of copper, silver, gold, chromium, platinum, molybdenum, or a simple substance of aluminum, or an alloy mainly containing any of these .
A distance from a surface of the transparent substrate opposite to the light shielding layer in the connection portion to a surface of the conductive pad opposite to the transparent substrate is opposite to the light shielding portion of the transparent substrate in the display portion. And a distance from the surface on the side opposite to the surface of the metal wiring on the side opposite to the transparent substrate . The color filter according to claim 1, wherein the base layer is made of the same material as the colored portion. The color filter according to claim 1, wherein the base layer is made of the same material as the light shielding layer and is integral with the light shielding layer. A color filter having a transparent substrate, a display unit arranged on the transparent substrate, and a connection unit arranged on the same surface as the surface of the transparent substrate on which the display unit is arranged and in an area outside the display unit. A method of manufacturing a color filter, comprising:
A light-shielding portion and a light-shielding layer arranging step of simultaneously performing a light-shielding portion arranging step of arranging a light-shielding portion having an opening in the display portion, and a light-shielding layer arranging step of arranging a light-shielding layer in the connection portion,
In the opening portion of the light shielding portion arranged in the display portion, a coloring portion arrangement step of arranging a patterned coloring portion,
A base layer disposing step of disposing a base layer on the light shielding layer,
A metal wiring arranging step of arranging a metal wiring on the light shielding portion and a conductive pad arranging step of arranging a conductive pad on the base layer at the same time;
Have
The color filter is integrated with a touch panel,
The metal wiring is a member used as the sensor wiring of the touch panel,
The metal wiring is composed of copper, silver, gold, chromium, platinum, molybdenum, or a simple substance of aluminum, or an alloy mainly containing any of these .
A distance from a surface of the transparent substrate opposite to the light shielding layer in the connection portion to a surface of the conductive pad opposite to the transparent substrate is opposite to the light shielding portion of the transparent substrate in the display portion. A method of manufacturing a color filter, wherein the distance from the surface on the side to the surface of the metal wiring on the side opposite to the transparent substrate is larger . The base layer is the same material as the colored portion,
The method of manufacturing a color filter according to claim 4, wherein the base layer arranging step is performed simultaneously with the colored portion arranging step. The underlying layer is made of the same material as the light shielding layer,
The method of manufacturing a color filter according to claim 4, wherein the base layer disposing step is performed simultaneously with the light shielding layer disposing step.