JP6600971B2 - Manufacturing method of color filter - Google Patents

Description

  The present invention relates to a color filter with a detection electrode having an alignment mark.

A touch panel is widely used as an input unit for various devices in which a display device such as a liquid crystal display or a plasma display is incorporated, and the demand for such a display device with a touch panel tends to be further increased.
In a display device with a touch panel, the touch panel is disposed on the display surface of the display device, and enables extremely direct input to the display device.

  Among touch panels, electrostatic capacitive touch panels are attracting attention because they are optically bright, have good design properties, have a simple structure, and have excellent functions. Capacitive touch panel is a method that detects weakness by passing a weak current through the touch panel surface to form an electric field and converting the change in the capacitance value on the touch panel surface generated by touching the screen into a voltage drop. The contact position obtained by doing so is output as a signal, and the detection position is recognized to operate.

  Among the capacitive touch panels, the built-in type includes a touch panel substrate provided with a detection pattern for detecting the approach or contact of an external conductor on the substrate. Since the substrate in the substrate can be made common with the substrate of the color filter in the display device, for example, it can be reduced in weight and thickness, and is preferable in terms of low cost. As such a built-in touch panel, an in-cell type and an on-cell type are known (for example, see Patent Documents 1 to 4).

The detection pattern is composed of two-direction detection electrodes, a detection electrode for detecting the X direction and a detection electrode for detecting the Y direction. As the detection electrode, a transparent conductive material is generally used in order to make it difficult for an operator of a display device with a touch panel to be visually recognized. However, in recent years, an electrode made of an opaque metal material is also used due to a demand for higher sensitivity. ing. However, when a detection electrode made of a metal material is present in the display area, it is easily recognized as described above, and the display is hindered.
Therefore, by forming one detection electrode on the light-shielding portion of the color filter using a metal material, the one detection electrode is hidden by the light-shielding portion in the display area, and the other detection electrode is made transparent. By forming a conductive material on a color filter or on a substrate (hereinafter referred to as a counter substrate) arranged to face the color filter in the display device, the other detection electrode is placed on the display region. A method of making it difficult to see even if it exists is used (see Patent Document 4).

In the color filter in which the one detection electrode is formed on the light shielding portion, for example, an alignment mark is formed simultaneously with the formation of the light shielding portion on the transparent substrate, and the one of the detection electrodes is formed on the light shielding portion with reference to the alignment mark. The detection electrode can be formed, and further, a colored layer of each color can be formed in the opening in the light shielding portion with reference to the same alignment mark. According to this method, alignment between the light shielding portion, the one detection electrode, and the colored layer can be performed with high accuracy.
Then, when manufacturing a display device with a touch panel including such a color filter, the alignment mark on the color filter and the alignment mark on the counter substrate are bonded so as to overlap each other in plan view. Position alignment between the filter and the counter substrate can also be performed with high accuracy. At this time, the other detection electrode formed on the counter substrate is formed with reference to the alignment mark on the counter substrate facing the alignment mark on the color filter. It can be aligned with one of the upper sensing electrodes.

  Recently, the design of a color filter having both detection electrodes in two directions, that is, a color filter having the other detection electrode formed so as to intersect and insulate one of the detection electrodes has been advanced. In this case, the other detection electrode is formed with reference to the same alignment mark on the color filter as in the case of the one detection electrode, so that the detection electrodes are aligned with each other.

JP 2013-97704 A JP 2009-211531 A International Publication No. 2014-119002 JP 2013-164744 A

  By the way, in mobile electronic devices and the like, display devices with a touch panel are becoming higher definition, and more advanced operations can be performed by touching the touch panel screen with a touch area smaller than the touch of a touch pen or the like. There is a need to make it possible. In order to improve the detection resolution of the detection pattern in order to meet such demands, it is necessary to form each detection electrode narrower than in the past and to align each detection electrode with high accuracy. is there.

However, if each of the two-direction detection electrodes is formed by the above-described method, there is a driving problem that the alignment accuracy between the detection electrodes is low and the accurate detection position cannot be recognized.
This is because, when each detection electrode is formed with the same alignment mark as a reference, an error inevitably occurs in the formation position of each detection electrode with respect to the alignment mark. This is because even if the error is slight, a large shift occurs when viewed at the relative position between the detection electrodes.
The narrower the detection electrodes, the larger the displacement of the positions where the detection positions are formed, and the greater the displacement of the relative positions of the detection electrodes. For this reason, it is anticipated that the alignment accuracy of the detection electrodes is further reduced due to the narrowing of the detection electrodes.

  In addition, when one detection electrode on the light shielding portion has a small formation position error with respect to the alignment mark but is formed to have an inclination with respect to the surface direction of the light shielding portion, the other detection electrode has the alignment Since it is formed on the basis of the position with respect to the mark, it is not formed at a position in consideration of the inclination angle of the one detection electrode. For this reason, the detection electrodes cannot be arranged orthogonally, and it becomes difficult to recognize an accurate detection position from a change in capacitance generated between the detection electrodes.

  The above-described problem occurs not only when the two-direction detection electrodes are provided in the color filter but also when the other detection electrode is disposed on the counter substrate to be bonded to the color filter. That is, when the other detection electrode is formed on the counter substrate, it is formed with reference to the alignment mark on the counter substrate facing the alignment mark on the color filter. For this reason, when the color filter and the counter substrate are bonded to each other, a shift occurs in the relative position between the detection electrodes as in the case where the detection electrodes are formed with reference to the same alignment mark.

  The present invention has been made in view of the above-described problems, and mainly provides a color filter capable of aligning detection electrodes in two directions with high precision in a display device with a touch panel using a color filter. Objective.

  In order to solve the above-mentioned problem, the present inventors have conducted intensive studies, and as a result, one detection electrode is formed on the color filter substrate with reference to an alignment mark formed of the same material as the light shielding portion. At the same time, another alignment mark made of the same material as one of the detection electrodes is formed, and the other detection electrode is formed or arranged with reference to the other alignment mark, so that the two-direction detection electrodes can be accurately aligned. We found that it is possible to align. The present invention is based on such knowledge.

  That is, the present invention relates to a transparent substrate, a light-shielding portion formed in a pattern on the transparent substrate and having an opening, and a stripe-shaped first detection formed on the light-shielding portion along one direction. An electrode, a colored layer of a plurality of colors formed in the opening of the light shielding part, and two types of alignment marks formed on the surface of the transparent substrate on which the light shielding part and the colored layer are formed, One of the two types of alignment marks is a first alignment mark formed of the same material as the first detection electrode, and the other is the same material as the light shielding portion. The color filter is characterized in that it is a second alignment mark formed in (1).

  According to the present invention, the second detection electrode is formed on the color filter with reference to the first alignment mark formed of the same material as the first detection electrode, or the second detection electrode is formed. By bonding the counter substrate, the second detection electrodes can be arranged so as to intersect the first detection electrodes in plan view, and the detection electrodes can be aligned with high accuracy.

  In the said invention, you may have the 2nd sensing electrode insulated from the said 1st sensing electrode in the one surface side of the said transparent substrate. This is because the detection electrodes can be aligned with higher accuracy by forming the second detection electrodes at desired positions on the same transparent substrate with the first alignment mark as a reference.

  The color filter of the present invention includes an alignment mark formed of the same material as that of the first detection electrode, so that the two-direction detection electrode is aligned with high accuracy in the display device with a touch panel including the color filter. There is an effect that it is possible.

It is a schematic plan view which shows an example of the color filter of this invention. It is the XX sectional view taken on the line of FIG. It is the YY sectional view taken on the line of FIG. It is a schematic sectional drawing which shows the other example of the color filter of this invention. It is a schematic diagram for demonstrating the formation method of the 2nd detection electrode using a 1st alignment mark. It is explanatory drawing for demonstrating the 1st detection electrode in this invention. It is the schematic plan view and sectional drawing which show the other example of the color filter of this invention.

Hereinafter, the color filter of the present invention will be described in detail.
The color filter of the present invention includes a transparent substrate, a light shielding portion formed in a pattern on the transparent substrate, having an opening, and a stripe-shaped first formed on the light shielding portion along one direction. A detection electrode; a colored layer of a plurality of colors formed in the opening of the light shielding portion; and two types of alignment marks formed on a surface of the transparent substrate on which the light shielding portion and the colored layer are formed; , Wherein one of the two types of alignment marks is a first alignment mark formed of the same material as the first detection electrode, and the other is the same as the light shielding portion. The second alignment mark is made of a material.

The color filter of the present invention will be described with reference to the drawings. 1 is a schematic plan view showing an example of the color filter of the present invention, FIG. 2 is a cross-sectional view taken along line XX of FIG. 1, and FIG. 3 is a cross-sectional view taken along line YY of FIG.
The color filter 10 of the present invention is a striped pattern formed on the transparent substrate 1, the transparent substrate 1 in a pattern shape, the light shielding portion 2 having the opening P, and the light shielding portion 2 along one direction. The first detection electrode 3, the colored layers 4 (the red colored layer 4 R, the green colored layer 4 G, and the blue colored layer 4 B) formed in the opening P of the light shielding portion 2, and the light shielding portion of the transparent substrate 1. 2 and the first alignment mark 5 and the second alignment mark 6 formed on the surface on which the colored layer 4 is formed.
The first alignment mark 5 is made of the same material as the first detection electrode 3, and the second alignment mark 6 is made of the same material as the light shielding part 2.

FIG. 4 is a schematic sectional view showing another example of the color filter of the present invention. In the color filter 10 illustrated in FIG. 4, the colored layer 4 is formed in the opening P of the light shielding portion 2 so as to cover the first detection electrode 3. As illustrated in FIG. 4, the light shielding unit 2 includes a pixel classification light shielding unit 2 </ b> A that is formed in the display region 11 and segments pixels, and a frame light shielding unit 2 </ b> B formed in the non-display region 12. Two types of alignment marks, the first alignment mark 5 and the second alignment mark 6, are formed in the non-display area 12 of the color filter.
Here, the “display area” refers to an area used for image display when the color filter of the present invention is used in a display device. In addition, the “non-display area” refers to an area arranged on the outer periphery of the display area.
The “display area” corresponds to the active area of the touch panel in the display device with the touch panel, and the “non-display area” corresponds to the inactive area of the touch panel.

  According to the present invention, the second detection electrode is formed on the color filter with reference to the first alignment mark formed of the same material as the first detection electrode, or the second detection electrode is formed. By bonding the counter substrate to the color filter, the second detection electrodes can be arranged so as to intersect the first detection electrodes in plan view, and the detection electrodes can be aligned with high accuracy. It becomes.

  Further, when a display device with a touch panel provided with the color filter of the present invention is manufactured by using the second alignment mark provided on the transparent substrate, the color filter and the counter substrate are attached on the basis of the second alignment mark. By matching, it becomes possible to align with high accuracy.

Here, the alignment of the first detection electrode and the second detection electrode by the first alignment mark will be described with reference to the drawings.
FIG. 5 is a schematic diagram for explaining a method of forming the second detection electrode using the first alignment mark, and the second detection electrode is formed on the same surface as the surface on which the first detection electrode of the touch panel sensor is formed. It is an example which forms a detection electrode. FIG. 5 corresponds to a cross-sectional view along the direction in which the first detection electrode of the touch panel sensor is formed.
As shown in FIG. 5, when the second detection electrode is formed on the same surface as the surface on which the first detection electrode 3 of the color filter 10 of the present invention is formed, first, as shown in FIG. In addition, a transparent conductive layer 17 made of a transparent conductive material is formed on the light shielding portion 2, the first detection electrode 3, and the colored layer via an insulating overcoat layer 8, and the active area of the transparent conductive layer 17 is formed. A photoresist 31 is applied on the region to be.
Next, as shown in FIG. 5B, pattern exposure L is performed on the photoresist 31 using a photomask 32. At this time, the position where the photomask 32 is arranged is adjusted so that the mark A provided in advance on the photomask 32 overlaps the first alignment mark 5 of the color filter 10. For the position adjustment of the photomask 32, for example, the position of the first alignment mark 5 is confirmed by the camera 33 or the like, and the mark A provided on the photomask 32 is overlapped with the first alignment mark 5.
Next, the photoresist 31 is developed and the transparent conductive layer 17 is patterned, so that the second detection electrode 7 is orthogonal to the first detection electrode 3 in plan view as shown in FIG. Can be formed.

Conventionally, when forming the second detection electrode, the photomask is arranged so that the mark provided on the photomask and the second alignment mark overlap with each other, and pattern exposure is performed. For this reason, a large shift occurs in the relative positions of the detection electrodes due to a positional shift that occurs when the first detection electrode is formed and a positional shift that occurs when the second detection electrode is formed.
In contrast, in the present invention, as shown in FIG. 5, when forming the second detection electrode 7, not the second alignment mark 6 but the first alignment mark 5 formed simultaneously with the first detection electrode 3. Since the pattern exposure is performed with the photomask provided as a reference, the positional deviation of the second detection electrode 7 with respect to the first detection electrode 3 can be suppressed. Thereby, the alignment accuracy of the first detection electrode and the second detection electrode can be improved.

  Although not shown, the positions of the first detection electrode and the second detection electrode using the first alignment mark when the color filter of the present invention and the counter substrate on which the second detection electrode is formed are bonded together. As an alignment method, for example, an alignment mark is formed simultaneously with the formation of the second detection electrode on the counter substrate, and when the color filter and the counter electrode substrate are overlapped in plan view, By arranging the electrodes while confirming the position with a camera or the like so that the alignment mark on the counter electrode substrate side overlaps, the detection electrodes can be aligned with high accuracy.

  Hereinafter, each structure in the color filter of this invention is demonstrated.

1. Alignment Mark The alignment mark in the present invention is formed on the surface of the transparent substrate on which the light shielding portion and the colored layer are formed, and has two types, a first alignment mark and a second alignment mark.
Hereinafter, each alignment mark will be described.

(1) First alignment mark The first alignment mark is made of the same material as the first detection electrode.
The first alignment mark functions as a positioning reference when forming or arranging the stripe-shaped second detection electrodes so as to intersect the first detection electrodes in plan view.

  The material of the first alignment mark is the same as the material of the first detection electrode described in the section “2. First detection electrode” to be described later, and thus the description thereof is omitted here.

  The shape of the first alignment mark in plan view is not particularly limited, and can be generally the same as the shape of the alignment mark provided on the color filter. For example, cross shape, x (cross) mark shape, paddle shape, well shape, dot shape such as circle shape, square shape, triangle shape, double round shape, double square shape, hollow square Examples include shapes and the like, and combinations of these shapes.

The first alignment mark may be transparent or opaque depending on the type of material used for the first detection electrode.
The transmittance and optical density of the first alignment mark are not particularly limited as long as they can be detected when forming the second detection electrode, and can be appropriately set according to the material of the first detection electrode. .

The size of the first alignment mark is not particularly limited as long as it can be read by an exposure machine, and can be, for example, about 100 μm × 100 μm.
The thickness of the first alignment mark can be the same as the thickness of the first detection electrode.
Further, the number of first alignment marks is not particularly limited.

  The first alignment mark can be formed by any method that can be formed at the same time as the first detection electrode, and will be described in the section “2. First detection electrode”, and thus the description thereof is omitted here.

(2) Second alignment mark The second alignment mark is formed of the same material as the light shielding portion.
The second alignment mark functions as a positioning reference when forming the first detection electrode and the plurality of colored layers on the transparent substrate.
The second alignment mark can also be used for alignment when the color filter and a counter substrate such as a TFT substrate are bonded in the manufacture of a display device with a touch panel using the color filter of the present invention.

The material of the second alignment mark is the same as the material described in the section “3.
Further, the thickness of the second alignment mark can be the same as the thickness of the light shielding portion.

The optical density (OD) of the second alignment mark can be detected when the first detection electrode or the plurality of colored layers are formed on the transparent substrate, or when the color filter of the present invention is bonded to the counter substrate. There is no particular limitation as long as it can be set as appropriate according to the material to be used, but it is preferably the same as the optical density (OD) of the light shielding part. When the second alignment mark shows an optical density (OD) different from that of the light shielding portion, the light shielding portion and the second alignment mark have different thicknesses, and the second alignment is performed using a halftone mask or the like when forming the light shielding portion. This is because the mark needs to be formed, and costs are increased.
The specific optical density (OD) of the second alignment mark is preferably about 4 which is the optical density (OD) used for a black matrix of a normal color filter.

The shape of the second alignment mark in plan view can be the same as the shape described in the section “(1) First alignment mark”.
Further, the number of second alignment marks is not particularly limited.

  As a method for forming the second alignment mark, any method can be used as long as it can be formed at the same time as the light shielding portion, and the description thereof will be omitted because it will be described in the section “3.

(3) Others The first and second alignment marks are formed on the surface of the transparent substrate on which the light shielding portion and the colored layer are formed. Especially, it is preferable to form in the non-effective area | region except the effective area | region where the said colored layer is formed in the color filter of this invention, ie, the non-display area | region of the color filter of this invention. This is because each alignment mark can be made difficult to be visually recognized by an operator of a display device with a touch panel including the color filter of the present invention.

2. 1st detection electrode The 1st detection electrode in this invention is a striped thing formed along one direction on the said light-shielding part.
The first detection electrode is used together with the second detection electrode to detect a contact position as a detection pattern.

Since the first detection electrode is formed on the light shielding portion, it may or may not have transparency, and can be appropriately selected according to the material to be used.
The material for forming the first detection electrode may be any material as long as it has conductivity, and can be appropriately selected according to the presence or absence of transparency. As the material, a metal material, a transparent conductive material, or the like is used. By using a metal material, an opaque first detection electrode can be obtained. On the other hand, by using a transparent conductive material, a transparent first detection electrode can be obtained.
Examples of the metal material include metals such as Cu, Ag, Au, Pt, Al, Cr, and Co, alloys of the above-described metals such as APC (alloys including Ag, Pd, and Cu), or MAM (molybdenum film, aluminum. A multilayer metal film represented by a multilayer metal film in which a neodymium alloy film and a molybdenum film are laminated in this order can be given.
Transparent conductive materials include indium tin oxide (ITO), zinc oxide, indium oxide, antimony-added tin oxide, fluorine-added tin oxide, aluminum-added zinc oxide, potassium-added zinc oxide, silicon-added zinc oxide, and zinc oxide. -Metal oxides such as tin oxide, indium oxide-tin oxide, and zinc oxide-indium oxide-magnesium oxide, and materials in which two or more of these metal oxides are combined. Further, for example, a conductive polymer obtained by adding the above metal to a resin material such as PEDOT, such as PEDOT-PSS, or an organic conductive film formed from the conductive polymer may be used.
Among these, a metal material is preferable as the material of the first detection electrode. This is because even if the first detection electrode is narrow, the electrical resistance can be reduced and the detection sensitivity can be improved. Among the metal materials, APC is preferable because it exhibits high conductivity.

As the line width of the first detection electrode, the contact position can be accurately detected, and it may be equal to or smaller than the line width of the light shielding portion. For example, the line width is within a range of 1 μm to 15 μm. Within the range of 13 μm is preferable. When the line width of the first detection electrode is less than the above range, the electrical resistance may not be sufficiently reduced. On the other hand, when the said line width exceeds the said range, there exists a possibility that the function requested | required of the display apparatus with a touch panel cannot be exhibited.
Note that the line width of the first detection electrode refers to the width of the stripe shape and is a portion indicated by d in FIG.

  The thickness of the first detection electrode is not particularly limited as long as it has a desired conductivity. For example, the thickness is within a range of 10 nm to 1000 nm, particularly within a range of 50 nm to 800 nm, and particularly within a range of 100 nm to 500 nm. Preferably there is. If the thickness of the first detection electrode is less than the above range, the resistance of the first detection electrode may increase and the electrode may not function sufficiently. On the other hand, if the thickness exceeds the above range, the first detection electrode is formed. It may take a lot of time and the manufacturing cost may be high, or the first detection electrode may be easily cracked or peeled off.

  As a method for measuring the line width and thickness of the first detection electrode, a general measurement method can be used. For example, the measurement can be performed using an observation image of a transmission electron microscope (TEM). Other members can be measured by the same method.

Since the first detection electrode is formed along one direction on the light shielding part, it is not usually formed on the colored layer located in the opening of the light shielding part.
Here, the first detection electrode is formed on the light shielding portion along one direction, as shown in FIG. 6A, the light shielding portion 2 is formed in two directions of the X direction and the Y direction. In this case, the first detection electrode 3 may be formed on the light shielding part 2 extending in the X direction, or may be formed on the light shielding part extending in the Y direction (not shown).

In addition, the first detection electrode having a stripe shape may be any shape as long as the first detection electrode located on the light-shielding portion is in a stripe shape, as shown in FIG. One detection electrode 3 may have a stripe shape in a plan view and a shape in a plan view outline (a plan view shape) may be a mesh shape. Even if it is a case where a metal material is used by making the planar view shape of the 1st detection electrode into mesh shape, it can be set as the 1st detection electrode which has transparency. Examples of the minimum unit shape constituting the mesh shape include a triangle, a quadrangle, a rhombus, and a hexagon.
Further, a plurality of striped thin wire electrodes may be bundled to form one striped first detection electrode.

The first detection electrode is usually connected to the extraction wiring in the non-display area, and is connected to the first external connection terminal at the end of the extraction wiring. The first external connection terminal is connected to the control circuit of the display device together with the second external connection terminal connected to the extraction wiring connected to the second detection electrode, and detects a change in the capacitance value.
For example, as shown in FIG. 6A, each of the first detection electrodes formed on each light-shielding portion may be connected to the extraction wiring 13 in the non-display area 12, as shown in FIG. 6B. As shown, a plurality of first detection electrodes 3 on each light shielding portion 2 may be bundled in the non-display area 12 and connected to one extraction wiring 13.
The extraction wiring and the external connection terminal will be described later.

As a method of forming the first detection electrode, any method can be used as long as it can be formed along one direction on the light shielding portion and can simultaneously form the first alignment mark. Among these, a method of forming with reference to the second alignment mark is preferable. This is because the light shielding portion and the first detection electrode can be aligned with high accuracy.
Specifically, after forming a thin film on the surface of the transparent substrate where the light-shielding portion is formed by vapor deposition or sputtering, a resist is applied on the thin film, and the photomask is used as a second alignment mark and a photomask mark. The first detection electrode and the first alignment mark can be formed by patterning the resist so that they overlap each other and etching the thin film through the obtained resist pattern.

3. Light-shielding part The light-shielding part in this invention is formed in a pattern shape on a transparent substrate, and has an opening part.
The light-shielding part usually has a pixel-partitioning light-shielding part that is formed in the display area and divides pixels, and a frame light-shielding part formed in the non-display area.

The shape of the opening of the light-shielding portion can be the same as that used for a general color filter, and examples thereof include a stripe shape, a dogleg shape, and a delta arrangement.
The width of the opening can be the same as the width of the opening in a general color filter.

The line width of the light-shielding part can be appropriately selected according to the use of the color filter of the present invention, and is not particularly limited. It is preferable to be within the range. When the line width of the light shielding portion is less than the above range, it may be difficult to sufficiently define pixels using the light shielding portion. Moreover, when larger than the said range, the high definition of the color filter of this invention and a display apparatus with a touch panel using the same may not be attained.
Here, the “line width of the light shielding portion” refers to, for example, distances indicated by W1 and W2 in FIG. Moreover, when the line width of the light-shielding part has different line widths W1 and W2, it is usually adjusted so that both are included in the numerical value range.

  The material of the light shielding part can be the same as the material used for the light shielding part in a general color filter, and a material in which a black color material is dispersed or dissolved in a binder resin is usually used. Examples of such a light shielding part material include black color materials and binder resin materials in the light shielding part described in JP-A-2008-90191.

The thickness of the light shielding part is not particularly limited as long as a desired light shielding property can be exhibited, and can be, for example, about 0.5 μm to 2.0 μm.
Further, the optical density of the light shielding part can be the same as that of the light shielding part in a general color filter.

  The light shielding part may be formed by any method as long as the second alignment mark can be formed at the same time, and can be the same as a method used for a general color filter. For example, a photolithography method, a printing method, an inkjet method The law can be mentioned.

4). Colored layer The colored layer in the present invention is formed in the opening of the light shielding part and has a plurality of colored layers.

  The colored layer has, for example, three colored layers of red, green, and blue. The color of the colored layer may be any color as long as it contains 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, Five colors such as green, blue, yellow, and cyan may be used.

The colored layer is, for example, a color material dispersed in a binder resin.
Examples of the color material include pigments and dyes of each color. Examples of the color material used for the red colored layer include perylene pigments, lake pigments, azo pigments, quinacridone pigments, anthraquinone pigments, anthracene pigments, and isoindoline pigments. Examples of the color material used in the green coloring layer include phthalocyanine pigments such as halogen polysubstituted phthalocyanine pigments or halogen polysubstituted copper phthalocyanine pigments, triphenylmethane basic dyes, isoindoline pigments, and isoindolinone pigments. And pigments. Examples of the color material used in the blue colored layer include copper phthalocyanine pigments, anthraquinone pigments, indanthrene pigments, indophenol pigments, cyanine pigments, dioxazine pigments, and the like. These pigments and dyes may be used alone or in combination of two or more.
As the binder resin, for example, a photosensitive resin having a reactive vinyl group such as acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber is used.
The colored layer may contain a photopolymerization initiator and, if necessary, a sensitizer, a coatability improver, a development improver, a crosslinking agent, a polymerization inhibitor, a plasticizer, a flame retardant, and the like.

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

  There may or may not be a gap between adjacent colored layers, but it is preferable that there is no gap among them.

  Moreover, the white layer which does not contain the said color material but contains the said binder resin may be formed on the same plane in which the colored layer is formed.

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

As a method for forming the colored layer, any method can be used as long as a plurality of colored layers can be arranged on the same plane, and examples thereof include a photolithography method, an inkjet method, and a printing method.
In the present invention, the colored layer is usually formed after forming a light shielding layer on a transparent substrate and forming a first detection electrode along one direction on the light shielding layer. Therefore, as illustrated in FIG. 4, the colored layer may be formed so as to cover the first detection electrode 3 on the pixel-segmenting light-shielding portion 2A. Especially, it is preferable that the colored layer is formed so as to cover the first detection electrode on the light shielding portion. This is because when the colored layer is below the first detection electrode on the light shielding portion, there is a possibility that a step is formed with the first detection electrode directly formed on the frame light shielding portion or the like, resulting in disconnection.

5). Transparent substrate The transparent substrate in this invention supports each structure in the color filter of this invention.
As the transparent substrate, those generally used for color filters can be used. For example, non-flexible inorganic substrates such as quartz glass, Pyrex (registered trademark) glass, synthetic quartz plate, and transparent Examples thereof include a resin substrate having flexibility such as a resin film and an optical resin plate. Among them, it is preferable to use an inorganic substrate, and it is preferable to use a glass substrate among inorganic substrates. Furthermore, it is preferable to use an alkali-free type glass substrate among the glass substrates. This is because the alkali-free 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 can be suitably used for a color filter for a display device. .
In the present specification, the term “film” includes a sheet that is thicker than a film in addition to a narrowly defined film.

  Here, in the case of “transparency” and “transparency”, unless otherwise specified, the operator of the display device with a touch panel using the color filter of the present invention does not hinder visual recognition from the operation surface. Say transparency. Therefore, “transparent” and “transparency” include colorless and transparent, and colored transparency that does not impede visibility, and are not defined by strict transmittance, and are transmissive depending on the use of the color filter of the present invention. The degree of can be determined.

  The thickness of the transparent substrate is not particularly limited as long as it can support each component and can be appropriately designed according to the use of the color filter of the present invention. For example, a general color filter It can be the same as the thickness of the substrate used.

6). Arbitrary Configuration The color filter of the present invention is not particularly limited as long as it has each configuration described above, and may optionally have an arbitrary configuration.
Hereinafter, an arbitrary configuration assumed for the color filter of the present invention will be described.

(1) Overcoat layer The color filter of this invention may have an overcoat layer which covers a light-shielding part, a colored layer, and a 1st detection electrode. This is because the surface of the color filter can be flattened by the overcoat layer.
The overcoat layer can be the same as that used for a general color filter, and any of an organic material and an inorganic material can be used as a material for the overcoat layer. When the overcoat layer is composed of an inorganic material, barrier properties can be imparted. Further, when the overcoat layer is made of a material having an insulating property, insulation when a second detection electrode described later is formed on the same surface as the surface on which the first detection electrode of the transparent substrate is formed. Can be used as a layer.
Examples of the material for the overcoat layer include those disclosed in Japanese Patent Application Laid-Open No. 2014-186641.
The thickness of the overcoat layer and the forming method can be the same as those of the overcoat layer generally used for color filters.

(2) Second Detection Electrode The color filter of the present invention may have a second detection electrode insulated from the first detection electrode on one surface side of the transparent substrate. The second detection electrode is formed or arranged with reference to the first alignment mark. This is because the detection electrodes can be aligned with higher accuracy by forming or arranging the second detection electrodes at desired positions on the same transparent substrate with the first alignment mark as a reference.

  The second detection electrode has a stripe shape, and is formed or arranged so as to intersect the first detection electrode in plan view. Usually, the first detection electrode and the second detection electrode are formed or arranged so as to be orthogonal in a plan view. In the present invention, since the second detection electrode is formed or arranged with reference to the first alignment mark, the orthogonal accuracy of both detection electrodes can be further improved.

Here, having the second detection electrode insulated from the first detection electrode on one surface side of the transparent substrate means that the first detection electrode of the transparent substrate is formed on the surface on the side. The second sensing electrode may be insulated from the first sensing electrode, and the surface of the transparent substrate opposite to the surface having the first sensing electrode, that is, the color filter of the present invention is used. In the display device with a touch panel, the second detection electrode may be provided on the surface of the transparent substrate located on the operator side. In this case, the first detection electrode and the second detection electrode can be insulated by the transparent substrate.
In the present invention, on either surface side of the transparent substrate, the second detection electrode is provided with reference to the first alignment mark, so that the first detection electrode and the second detection electrode can be aligned with high accuracy. Can be done.

Examples of the color filter having a second detection electrode insulated from the first detection electrode on the surface of the transparent substrate on which the first detection electrode is formed include, for example, the light shielding portion and the first detection electrode. A striped second detection electrode may be provided on the electrode and the colored layer so as to intersect the first detection electrode in plan view via an insulating layer or an overcoat layer.
FIG. 7A is a schematic plan view showing another example of the color filter of the present invention, FIG. 7B is a cross-sectional view taken along the line XX of FIG. 7A, and FIG. It is the YY sectional view taken on the line 7 (a). As shown in FIG. 7, the stripe-shaped second detection electrode 7 is formed on the light shielding portion 2, the first detection electrode 3, and the colored layer 4 on the transparent substrate 1 via the overcoat layer 8. It is formed so as to be orthogonal to the detection electrode 3 in plan view.

Since the second detection electrode usually has a position overlapping the colored layer in plan view, it is preferable to have transparency.
Examples of the material of the second detection electrode include transparent conductive materials such as the transparent metal oxide described in the section “2. First detection electrode”. Further, the second detection electrode may be made transparent by using a metal material as the material of the second detection electrode and making the shape of the second detection electrode in plan view a mesh shape. Examples of the metal material include the metal materials described in the section “2. First detection electrode”.

  The line width of the second detection electrode is not particularly limited as long as the contact position can be accurately detected, and may be the same as or different from the line width of the first detection electrode. Specifically, the line width of the second detection electrode is preferably in the range of 3 μm to 19 μm, and more preferably in the range of 4 μm to 14 μm.

  The planar shape and the planar external shape of the second detection electrode can be the same as those of the first detection electrode. In addition, the second detection electrode is connected to the extraction wiring in the non-display area and connected to the second external connection terminal. The connection mode between the second detection electrode and the lead-out wiring can be the same as the mode described in the section “2. First detection electrode”.

  The thickness of the second detection electrode is not particularly limited as long as it can have a desired conductivity and can accurately detect the contact position, depending on the material used. It can be set appropriately. For example, it is preferably in the range of 10 nm to 1000 nm, particularly in the range of 50 nm to 800 nm, particularly in the range of 100 nm to 500 nm. The reason for setting the thickness of the second detection electrode within the above range can be the same as the reason described in the section “2. First detection electrode”.

The second detection electrode only needs to be insulated from the first detection electrode. For example, as described above, an insulating layer or an overcoat layer is provided on the light shielding portion, the first detection electrode, and the colored layer. It may be directly formed in a stripe shape. Separately, using a transparent electrode layer in which a stripe-like second detection electrode is formed on a transparent substrate such as a transparent film substrate or a transparent glass substrate, the light shielding portion, the first detection electrode, and the colored layer are used. You may arrange by sticking on. At this time, an insulating layer or an overcoat layer may be interposed.
The transparent electrode layer can be obtained by forming the second detection electrode on a conventionally known transparent substrate by the same method as the method for forming the first detection electrode.

  The formation method for forming the second detection electrode on the surface of the transparent substrate on which the first detection electrode is formed is not particularly limited as long as it can be formed on the basis of the first alignment mark. For example, a formation method using a photolithography method can be preferably used. Since the specific formation method has already been described with reference to FIG. 5, the description thereof is omitted here. Similarly, when the second detection electrode is arranged on the surface of the transparent substrate on which the first detection electrode is formed by bonding the above-described transparent electrode layer, it can be bonded using the first alignment mark as a reference. For example, a method of forming an alignment mark on the transparent electrode layer and pasting the first alignment mark on the transparent substrate through the transparent adhesive layer may be used.

Further, as another aspect (hereinafter referred to as this aspect) of the color filter having the second detection electrode, a second stripe-shaped surface is formed on the surface of the transparent substrate opposite to the surface having the first detection electrode. The aspect which has this detection electrode is mentioned. In this aspect, the first detection electrode and the second detection electrode are insulated by passing through the transparent substrate.
In this aspect, the second detection electrode is disposed on the surface of the transparent substrate opposite to the surface having the first detection electrode with the first alignment mark in the present invention as a reference, so that the transparent substrate is interposed therebetween. Positioning of the first detection electrode and the second detection electrode can be performed with high accuracy.

As an example of such a color filter, for example, a second detection electrode portion in which a stripe-shaped second detection electrode is formed on the surface of the transparent substrate opposite to the surface having the first detection electrode is attached. Combined embodiments are mentioned.
As for the 2nd detection electrode part, what formed the striped 2nd detection electrode on transparent substrates, such as a transparent film substrate and a transparent glass substrate, is mentioned, for example.

As an arrangement method of the second detection electrode in this aspect, any method can be used as long as it can be aligned with the first detection electrode with high accuracy via a transparent substrate. Device (P-SE650aaH, manufactured by Climb Products Co., Ltd., hereinafter abbreviated as “device”), while confirming with the camera provided in the above device, the alignment mark on the device side and the first alignment mark overlap. Then, the transparent substrate on which the first detection electrode is formed is temporarily fixed, and then the second detection electrode pattern and the second detection electrode pattern are orthogonally crossed while confirming with a camera. There is a method in which the detection electrode portion is bonded to the surface of the transparent substrate opposite to the surface having the first detection electrode. An alignment mark is also provided on the second detection electrode part, and the second detection electrode part is arranged so that the first alignment mark on the transparent substrate and the alignment mark on the second detection electrode part side overlap. The method etc. which are bonded on the surface on the opposite side to the surface which has the 1st detection electrode of the said transparent substrate are also mentioned. In particular, an alignment mark is provided on the second detection electrode portion, and the first alignment mark on the transparent substrate and the alignment mark on the second detection electrode portion side overlap so that the second detection electrode portion is transparent substrate. The method of bonding on the surface opposite to the surface having the first detection electrode is preferable. This is because the first detection electrode and the second detection electrode can be aligned with better positional accuracy.
A transparent adhesive layer or the like is usually used for bonding the second detection electrode part.

(3) Insulating layer In the color filter of the present invention, when the second detection electrode is formed on the light shielding portion, the first detection electrode, and the colored layer, a short circuit between the first detection electrode and the second detection electrode. In order to prevent this, it is preferable to have an insulating layer between the first detection electrode and the second detection electrode.
When the color filter of the present invention has an overcoat layer that covers the light shielding portion, the colored layer, and the first detection electrode, the overcoat layer may be an insulating layer.

  As a material which comprises an insulating layer, if it has desired insulation, it will not specifically limit, What is generally used for a touch panel sensor etc. can be used. Specific examples include light-transmitting acrylic resins and siloxane resins. Among these, photosensitive siloxane resins can be preferably used.

  The thickness of the insulating layer is not particularly limited as long as a short circuit between the first detection electrode and the second detection electrode can be prevented. For example, the thickness is in the range of 0.5 μm to 3.0 μm. be able to.

  The insulating layer may be formed at least at the location where the first detection electrode and the second detection electrode intersect. For example, the insulating layer may be formed on the entire surface of the light shielding portion, the first detection electrode, and the colored layer. It may be formed, and may be formed in an island shape between the first detection electrode and the second detection electrode.

  The thickness of the insulating layer is not particularly limited as long as it can prevent a short circuit between the first detection electrode and the second detection electrode, and is generally used for a touch panel sensor. Can do. For example, it can be in the range of 0.5 μm to 3.0 μm.

  The method for forming the insulating layer is not particularly limited as long as the insulating layer can be accurately formed at a predetermined position, and examples thereof include a photolithography method and a printing method such as screen printing. It is also possible to process a film or the like that exhibits insulating properties and appropriate optical transparency and optical isotropy into a desired shape and laminate it as an insulating layer.

(4) Wiring In the color filter of the present invention, wiring may be formed on the side of the transparent substrate on which the first detection electrode is formed. Examples of wiring types include those commonly used for touch panel sensors, specifically, extraction wiring connected to the first detection electrode, external connection terminals formed at the ends of the extraction wiring, and the like. Can do.
When the color filter of the present invention includes the second detection electrode, a wiring for the second detection electrode may be formed on the surface of the transparent substrate on which the second detection electrode is formed.
The lead-out wiring and the external connection terminals can be the same as those disclosed in, for example, Japanese Patent Application Laid-Open No. 2014-071734.

(5) Other optional members The color filter of the present invention may have an alignment film on the overcoat layer and may have a spacer on the light shielding portion.
Having the spacer on the light shielding part includes the case where the spacer is provided on the position overlapping the light shielding part in plan view via another member such as the first detection electrode or the colored layer. Specifically, on the surface side of the transparent substrate having the light shielding portion, the first detection electrode, and the colored layer, an insulating layer or an over layer is formed on the light shielding portion including the first detection electrode and the colored layer. A spacer can be provided at a position overlapping the light shielding portion in plan view via the coat layer. At this time, the transparent substrate may have a stripe-shaped second detection electrode that intersects the first detection electrode in plan view between the insulating layer or the overcoat layer and the spacer. The second detection electrode may be provided on a surface opposite to the surface having the first detection electrode.
Further, as another example in which the spacer is formed on the light shielding portion, the light shielding portion including the first sensing electrode on the surface side of the transparent substrate having the light shielding portion, the first sensing electrode, and the colored layer. On the part, you may have the lamination | stacking spacer comprised by laminating | stacking the said colored layer in multiple numbers. An insulating layer or an overcoat layer may be further provided on the laminated spacer. At this time, a stripe-shaped second detection that intersects the first detection electrode in plan view between the laminated spacer and the insulating layer or the overcoat layer, or on the insulating layer or the overcoat layer. An electrode may be provided, and the second detection electrode may be provided on the surface of the transparent substrate opposite to the surface having the first detection electrode.

7). Manufacturing Method The manufacturing method of the color filter of the present invention is not particularly limited as long as it can have the above-described configuration, and a conventionally known color filter manufacturing method can be used.
Specifically, the light shielding part and the second alignment mark forming step for forming the light shielding part and the second alignment mark in a pattern on one surface of the transparent substrate, and the second alignment mark on the light shielding part as a reference A first sensing electrode forming step for forming striped first sensing electrodes along one direction, and a colored layer forming for forming a plurality of colored layers in the opening of the light shielding portion with reference to the second alignment mark By passing through the process, the color filter of the present invention can be manufactured. Since the formation method of each structure has already been described, description thereof is omitted here.

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

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

DESCRIPTION OF SYMBOLS 1 ... Transparent substrate 2 ... Light-shielding part 3 ... 1st detection electrode 4 ... Colored layer 4R ... Red colored layer 4G ... Green colored layer 4B ... Blue colored layer 5 ... 1st alignment mark 6 ... 2nd alignment mark 7 ... 2nd Detection electrode 10 ... color filter

Claims (2)

A light-shielding part forming step of forming a light-shielding part having an opening formed in a pattern on a transparent substrate;
  A first detection electrode forming step of forming a stripe-shaped first detection electrode disposed along one direction on the light shielding portion;
  A colored layer forming step of forming a colored layer of a plurality of colors arranged in the opening of the light shielding portion;
  A second detection electrode forming step of forming a second detection electrode insulated from the first detection electrode on one surface side of the transparent substrate;
  A method for producing a color filter having
  In the light shielding part forming step, a second alignment mark made of the same material as the light shielding object is formed simultaneously with the formation of the light shielding part in the non-display area of the color filter,
  In the first detection electrode forming step, a first alignment mark made of the same material as the first detection electrode is formed in the non-display area simultaneously with the formation of the first detection electrode,
  In the first detection electrode formation step, alignment for forming the first detection electrode is performed using the second alignment mark,
  In the second detection electrode formation step, alignment for forming the second detection electrode is performed using the first alignment mark.   2. The color filter manufacturing method according to claim 1, wherein in the second detection electrode forming step, the second detection electrode is formed so as to be orthogonal to the first detection electrode in plan view. Method.