JP5200411B2 - Color filter for horizontal electric field drive liquid crystal display device and method for manufacturing color filter for horizontal electric field drive liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color filter for IPS which has excellent reliability and is manufactured at a low cost. <P>SOLUTION: The color filter for IPS has: a transparent base material; a light shielding part formed on the transparent base material; and a coloring layer including a phthalocyanine based coloring part having a phthalocyanine based coloring agent and a non-phthalocyanine based coloring part having a non-phthalocyanine based coloring agent, and does not include a transparent protective layer, and the non-phthalocyanine based coloring part is formed on a tapered part of the phthalocyanine based coloring part. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a color filter that can be used in a horizontal electric field drive liquid crystal display device.

  In recent years, with the development of personal computers, in particular with the development of portable personal computers, the demand for liquid crystal displays has increased. In recent years, the penetration rate of home-use liquid crystal televisions has been increasing, and the market for liquid crystal displays is expanding. Furthermore, liquid crystal displays that have become widespread in recent years tend to have larger screens, and this tendency is particularly strong for home-use liquid crystal televisions. In such a situation, it is desired to manufacture a liquid crystal display that is low-cost and high-quality with high productivity, and in particular, a color filter having a function of color-displaying a liquid crystal display Such demand is increasing because of the high cost.

  In general, a color filter is formed on a transparent substrate, a transparent layer formed on the transparent substrate, and a colored layer composed of colored patterns of three primary colors of red, green, and blue, and so as to partition each colored pattern. And a light shielding portion.

  Here, the operation mode of a commonly used liquid crystal display device is a twisted nematic in which liquid crystal molecules aligned in parallel with a pair of opposed transparent substrates are driven by applying an electric field in a direction perpendicular to the transparent substrate. There are a (Twisted Nematic: TN) system, a lateral electric field drive (hereinafter referred to as IPS) system in which an electric field is applied in a direction parallel to the transparent substrate, and the like. Among such operation modes of the liquid crystal display device, in recent years, the IPS system has been widely used as the operation mode of the liquid crystal display device because of the advantage that the viewing angle is wide when the liquid crystal display is used.

  In such an IPS liquid crystal display device, a liquid crystal alignment film and a liquid crystal layer may be formed directly on the colored layer of the color filter, and in that case, the colorant contained in the colored layer, There has been a problem that phthalocyanine pigments and the like having high compatibility with liquid crystal are eluted into the liquid crystal layer through the liquid crystal alignment film.

  Conventionally, for example, a method of forming a transparent protective layer on the colored layer has been used to reduce the influence of elution of the colorant contained in the colored layer. In many cases, a transparent protective layer is not provided on the color filter in order to reduce the thickness and improve the light transmission. The elution of the above colorant into the liquid crystal layer causes the contamination of the liquid crystal, reducing the reliability. There is a problem such as.

Although not intended to reduce the contamination of the liquid crystal, Patent Document 1 discloses that a color filter having a plurality of colored pixels provided on a transparent substrate has a peripheral portion with a tapered cross-sectional shape. From the upper surface of the colored pixel to the upper surface of the light-shielding portion by forming a light-shielding portion on the peripheral portion of the colored pixel that overlaps the peripheral portions of adjacent colored pixels of other colors having a tapered peripheral portion. There is disclosed a color filter for a liquid crystal display device having a small image height (step), stable alignment of liquid crystal molecules, and stable image display quality.
However, Patent Document 1 does not disclose suppression of liquid crystal contamination.

JP 2006-330150 A

  The present invention has been made in view of the above problems, and has as its main object to provide an IPS color filter that is excellent in reliability and can be produced at low cost.

  In order to solve the above problems, the present invention provides a transparent substrate, a light-shielding portion formed on the transparent substrate, a phthalocyanine-based colored portion having a phthalocyanine-based colorant, and a non-phthalocyanine having a non-phthalocyanine-based colorant. An IPS color filter having a colored layer including a colored portion and not including a transparent protective layer, wherein the non-phthalocyanine colored portion is formed on a tapered portion of the phthalocyanine colored portion. An IPS color filter is provided.

  According to the present invention, since the non-phthalocyanine colored portion is formed on the tapered portion of the phthalocyanine colored portion, the phthalocyanine colored color known to have high compatibility with the liquid crystal from the tapered portion. Elution of the agent into the liquid crystal layer can be prevented. As a result, the liquid crystal can be prevented from being contaminated without providing a transparent protective layer or the like, and the display quality can be improved.

In the present invention, it is preferable that the phthalocyanine-based colored portion has a green colored portion and a blue colored portion, and the non-phthalocyanine-based colored portion has a red colored portion.
The color filter usually has a colored layer including colored portions of at least three primary colors of red, blue, and green. This is because, among the colored portions of each color, the blue and green colored portions are excellent in color developability, durability, and the like, and thus are generally formed by a phthalocyanine-based colored portion having a phthalocyanine-based colorant.

  The present invention includes a transparent substrate, a light-shielding portion formed on the transparent substrate, a colored layer including a phthalocyanine-based colored portion having a phthalocyanine-based colorant and a non-phthalocyanine-based colored portion having a non-phthalocyanine-based colorant. A non-phthalocyanine colored portion is formed on the tapered portion of the phthalocyanine-based colored portion, and includes at least the light-shielding portion. A colored layer having a phthalocyanine colored portion forming step for forming the phthalocyanine colored portion in the opening, and a non-phthalocyanine colored portion forming step for forming the non-phthalocyanine colored portion in at least the opening of the light shielding portion. The non-phthalocyanine-based, which has at least a forming step and is performed after the final phthalocyanine-based colored portion forming step Color portion forming step, also on the tapered part of the phthalocyanine-based coloring unit, to provide a method for manufacturing a color filter for the IPS, characterized in that it is intended to form the non-phthalocyanine colored portion.

According to the present invention, the non-phthalocyanine colored portion forming step performed after the final phthalocyanine colored portion forming step forms the non-phthalocyanine colored portion also on the tapered portion of the phthalocyanine colored portion. Accordingly, the tapered portion of the phthalocyanine-based colored portion can be covered with the non-phthalocyanine-based colored portion.
For this reason, the color filter for IPS manufactured using the manufacturing method of this invention can make the elution of a phthalocyanine colorant to a liquid crystal layer little. As a result, the contamination of the liquid crystal can be prevented and the display quality can be improved.

In the present invention, it is preferable that the halogenated phthalocyanine-based colored portion forming step included in the phthalocyanine-based colored portion forming step is performed first in the colored layer forming step.
When the halogenated phthalocyanine-based colored portion forming step is first performed during the colored layer forming step, the color filter for IPS manufactured by the manufacturing method of the present invention is reduced in reliability among phthalocyanine-based colorants. This is because the elution of the halogenated phthalocyanine pigment having a large influence on the amount can be reduced.

  The present invention has an effect of providing an IPS color filter that is excellent in reliability and can be produced at low cost.

  The present invention relates to an IPS color filter and a method for manufacturing the same. Hereinafter, the color filter for IPS and the method for producing the color filter of the present invention will be described.

A. IPS Color Filter First, the IPS color filter of the present invention will be described. The color filter for IPS of the present invention includes a transparent substrate, a light shielding portion formed on the transparent substrate, a phthalocyanine colored portion having a phthalocyanine colorant, and a non-phthalocyanine colored portion having a non-phthalocyanine colorant. The non-phthalocyanine colored portion is formed on the tapered portion of the phthalocyanine colored portion. .

Such an IPS color filter of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of an IPS color filter of the present invention. The IPS color filter 10 of the present invention illustrated in FIG. 1 includes a transparent base material 1, a light shielding portion 2 formed on the transparent base material 1, and a phthalocyanine-based coloring formed in an opening portion of the light shielding portion 2. And a colored layer 5 including a non-phthalocyanine-based colored portion 4 having a non-phthalocyanine-based colorant, and on the tapered portion 3b of the phthalocyanine-based colored portion 3 and the light-shielding portion 2 The non-phthalocyanine-based colored portion 4 is formed thereon.
Here, in the phthalocyanine-based colored portion 3, the portion on the opening portion of the light shielding portion 2 and the portion having a uniform thickness is the flat portion 3 a and is formed on the light shielding portion 2, and the flat portion. A portion having a thickness smaller than 3a is a tapered portion 3b. In addition, the thickness of the said colored layer means the distance from the said transparent base material surface to the surface of the said colored layer. The term “on the light shielding part” includes not only the light shielding part but also the flat part of the phthalocyanine-based colored part formed on the light shielding part.

  According to the present invention, a non-phthalocyanine-based colored portion having a non-phthalocyanine-based colorant is formed on a tapered portion of the phthalocyanine-based colored portion having the phthalocyanine-based colorant. It is possible to prevent elution of the phthalocyanine-based colorant, which is known for its high compatibility, into the liquid crystal layer. As a result, the liquid crystal can be prevented from being contaminated without providing a transparent protective layer or the like, and the display quality can be improved.

Here, the reason why the contamination of the liquid crystal can be suppressed by forming the non-phthalocyanine colored portion on the tapered portion of the phthalocyanine colored portion is estimated as follows.
That is, when the colored layer is formed on the transparent substrate by a photolithography method generally used for forming the colored layer of the color filter, the opening of the light shielding portion formed in a pattern on the transparent substrate. A mask having a transmissive region at a position corresponding to is used. When a colored layer is formed by a photolithography method using such a mask, a portion of the colored layer formed on the light shielding portion is located on a flat portion of the colored layer located at the opening of the light shielding portion. In comparison, it includes a portion that is cured by light (diffracted light) that has passed from the transmission region of the mask, that is, a portion that has low light intensity. Such a portion where the light intensity that reaches is low has a low degree of cure, is partially removed during development, and becomes a tapered portion where the thickness is thin, and such a taper portion is a degree of cure that was not removed during development. Is likely to include a low part.
For this reason, when the IPS color filter is used as a liquid crystal display device, when the portion having such a low degree of cure comes into direct contact with the liquid crystal layer, the member included in the portion having the low degree of cure is included in the liquid crystal layer Elution may cause liquid crystal contamination. In particular, the phthalocyanine-based colorant contained in the phthalocyanine-based colored portion contained in the colored layer is known to have high compatibility with the liquid crystal, and may be eluted into the liquid crystal layer when in direct contact with the liquid crystal layer. It is expensive.
On the other hand, when the non-phthalocyanine colored portion is formed on the tapered portion of the phthalocyanine colored portion, the non-phthalocyanine colored portion includes a taper portion of the phthalocyanine colored portion, a liquid crystal layer, and the like. Can be prevented from coming into direct contact, and as a result, the phthalocyanine-based colorant can be prevented from eluting, and contamination of the liquid crystal can be prevented.

The color filter for IPS of this invention has a transparent base material, a light-shielding part, and a colored layer.
Hereinafter, each structure of the color filter for IPS of this invention is demonstrated.

1. Colored layer First, the colored layer used in the present invention will be described. The colored layer used in the present invention includes a phthalocyanine colored portion having a phthalocyanine colorant and a non-phthalocyanine colored portion having a non-phthalocyanine colorant.

(1) Phthalocyanine coloring part The phthalocyanine coloring part used for this invention has a phthalocyanine coloring agent, and is formed in the opening part of the light-shielding part mentioned later. The phthalocyanine-based colored portion usually has a flat portion and a tapered portion, and the tapered portion is covered with a non-phthalocyanine-based colored portion described later.

Here, the phthalocyanine-based colored portion used in the present invention is a portion on the opening of the light-shielding portion 2 in the phthalocyanine-based colored portion 3 as shown in FIG. A flat portion 3a which is a portion and a tapered portion 3b which is formed on the light shielding portion 2 and which is thinner than the flat portion 3a.
Of the phthalocyanine-based colored portion, the tapered portion, which is a portion formed on the light-shielding portion, is highly likely to have a portion having a lower degree of curing than the flat portion. Further, such a portion having a low degree of curing has a low ability to stably fix the phthalocyanine colorant contained therein, and when it comes into contact with the liquid crystal layer, the phthalocyanine colorant is eluted into the liquid crystal layer. The possibility is high. However, since the tapered portion is covered with a non-phthalocyanine colored portion described later, among the phthalocyanine colored portions, the portion that is highly likely to be included in the tapered portion, and has a low degree of curing, Direct contact with the liquid crystal layer can be prevented, and elution of the phthalocyanine colorant contained in the phthalocyanine color part can be suppressed.

(I) Phthalocyanine-based colorant The phthalocyanine-based colorant used in the present invention is composed of a compound having a phthalocyanine skeleton, is highly compatible with a liquid crystal, and is likely to elute into the liquid crystal layer when in contact with the liquid crystal layer. It has properties.

  Such a phthalocyanine colorant is not particularly limited as long as it can be used as a colorant of each color by exhibiting absorption of light of a specific wavelength. For example, a halogenated phthalocyanine pigment ( Halogen multi-substituted phthalocyanine pigment or halogen multi-substituted copper phthalocyanine pigment) green colorant, blue colorant such as phthalocyanine pigment or copper phthalocyanine pigment, and cyan color obtained by mixing the above green colorant and blue colorant An agent etc. can be mentioned.

  In the present invention, the colorants of the respective colors of the phthalocyanine colorant may be used alone or in combination of two or more. Moreover, you may add the non-phthalocyanine type coloring agent mentioned later as a toning agent.

(Ii) Phthalocyanine-based colored portion The phthalocyanine-based colored portion used in the present invention has the phthalocyanine-based colorant described above, and the tapered portion of the phthalocyanine-based colored portion is covered with a non-phthalocyanine-based colored portion described later. Is.

  The colored portion of each color that such a phthalocyanine-based colored portion has is not particularly limited as long as it is obtained by having the phthalocyanine-based colorant, for example, any one of green, blue, and cyan It can have one or more colored portions. In the present invention, it is preferable that the phthalocyanine colored portion has a green colored portion and a blue colored portion. The color filter usually has a colored layer including colored portions of at least three primary colors of red, blue, and green, and is included in the colored portions of blue and green among the colored portions of the three primary colors of red, blue, and green. This is because a phthalocyanine colorant is generally used because the colorant to be used is excellent in color developability, durability and the like.

(2) Non-phthalocyanine-based colored portion The non-phthalocyanine-based colored portion used in the present invention has a non-phthalocyanine-based colorant and is formed in an opening of a light-shielding portion to be described later. It is also formed on the tapered portion of the system coloring portion.

  The non-phthalocyanine colorant contained in the non-phthalocyanine color part used in the present invention has a relatively low compatibility with liquid crystals. Therefore, even if the tapered portion of the non-phthalocyanine colored portion and the liquid crystal layer are in direct contact, the possibility that the non-phthalocyanine colorant is eluted into the liquid crystal layer is low. Therefore, by forming the non-phthalocyanine colored portion on the tapered portion of the phthalocyanine colored portion, elution of the phthalocyanine colorant from the phthalocyanine colored portion can be prevented, and contamination of the liquid crystal can be prevented. be able to.

(I) Non-phthalocyanine colorant The non-phthalocyanine colorant used in the present invention does not contain a phthalocyanine skeleton, has low compatibility with liquid crystals, and further exhibits absorption of light of a specific wavelength. Is not particularly limited as long as it can be used as, for example, red coloring such as perylene pigment, lake pigment, azo pigment, quinacridone pigment, anthraquinone pigment, anthracene pigment, isoindoline pigment, etc. Agents, triphenylmethane basic dyes, isoindoline pigments, isoindolinone pigments and other green colorants, anthraquinone pigments, indanthrene pigments, indophenol pigments, cyanine pigments, dioxazine pigments, etc. Blue colorant, azo pigment, isoindoline pigment, benzimidazolone pigment, azo dye Yellow colorant etc. can be used.

  In the present invention, the colorants of the respective colors of the non-phthalocyanine colorant may be used alone or in combination of two or more.

(Ii) Non-phthalocyanine-based colored portion The non-phthalocyanine-based colored portion used in the present invention is formed in an opening of a light-shielding portion described later and has a non-phthalocyanine-based colorant, and further includes the above phthalocyanine-based colored portion At least one layer is formed on the tapered portion.

Such a non-phthalocyanine colored portion may be formed only on the tapered portion of the phthalocyanine colored portion, and on the light shielding portion described later in addition to the tapered portion of the phthalocyanine colored portion. May also be formed.
In the present invention, in particular, the non-phthalocyanine-based colored portion is preferably formed not only on the tapered portion of the phthalocyanine-based colored portion but also on a light shielding portion described later.
The term “on the light shielding part” includes not only the light shielding part but also the flat part of the phthalocyanine-based colored part formed on the light shielding part.

  The colored portion of each color of the non-phthalocyanine-based colored portion used in the present invention is not particularly limited as long as it is obtained by having the non-phthalocyanine-based colorant. For example, red, green, It can have a colored portion of one or more colors of blue and yellow. In the present invention, in particular, when the phthalocyanine-based colored portion has a green colored portion and a blue colored portion, the non-phthalocyanine-based colored portion preferably has a red colored portion. Since the color filter usually has a colored layer including at least three primary colors of red, blue, and green, the non-phthalocyanine-based colored portion has a red colored portion, whereby red, blue, green This is because the phthalocyanine-based colored portion and the non-phthalocyanine-based colored portion can be surely included in the three primary colors.

  In addition, when the non-phthalocyanine colored portion has two or more colored portions, the non-phthalocyanine colored portion formed on the tapered portion of the phthalocyanine colored portion is any of them. Alternatively, a colored portion having one kind of color may be formed, or a colored portion having two or more kinds of colors may be formed. In the present invention, any of them can be suitably used. Among them, one in which a colored portion of any one color is formed is preferable. By forming one colored layer of each color included in the non-phthalocyanine colored portion on the tapered portion of the phthalocyanine colored portion, the elution of the phthalocyanine colorant into the liquid crystal layer is sufficiently suppressed. Because you can.

(3) Colored layer The arrangement of the colored layer used in the present invention is not particularly limited. For example, a general arrangement such as a stripe type, a mosaic type, a triangle type, or a four-pixel arrangement type may be used. it can. Moreover, the width | variety, area, etc. of a colored layer can be set arbitrarily.

  The phthalocyanine-based colored portion and the non-phthalocyanine-based colored portion included in the colored layer used in the present invention usually contain a binder resin in addition to the phthalocyanine-based colorant or the non-phthalocyanine-based colorant. As such a binder resin, when a photolithography method is used as a method for forming a colored layer, for example, a photosensitive resin having a reactive vinyl group such as an acrylate-based, a methacrylate-based, a polyvinyl cinnamate-based, or a cyclized rubber-based one. Resin can be used. If necessary, a photopolymerization initiator may be added to the binder resin, and further a sensitizer, a coatability improver, a development improver, a crosslinking agent, a polymerization inhibitor, and a plasticizer as necessary. A flame retardant or the like may be added.

  The film thickness of the phthalocyanine-based colored portion and the non-phthalocyanine-based colored portion included in the colored layer used in the present invention is usually set to about 1 μm to 5 μm.

  The method for forming the colored layer used in the present invention will be described in the section of “B. IPS Color Filter Manufacturing Method” which will be described later.

2. Transparent substrate The transparent substrate used in the present invention is not particularly limited as long as it is a substrate transparent to visible light, and a transparent substrate used for a general color filter can be used. . Specific examples include inflexible transparent rigid materials such as quartz glass, alkali-free glass, and synthetic quartz plates, or transparent flexible materials having flexibility such as transparent resin films and optical resin plates. It is done.

  Although the thickness of a transparent base material is not specifically limited, According to the use of the color filter manufactured by this invention, the thing of about 100 micrometers-1 mm can be used, for example.

3. Next, the light shielding part will be described. The light-shielding part in the present invention is formed on the above-described transparent substrate and has an opening.

  As the light-shielding portion used in the present invention, one in which openings having the same shape are formed in a pattern at regular intervals is usually used. Here, the pattern shape of the light shielding portion is not particularly limited, and examples thereof include a stripe shape and a matrix shape.

Examples of the light shielding part include those obtained by dispersing or dissolving a black colorant in a binder resin, and metal thin films such as chromium and chromium oxide. This metal thin film may be a CrO _x film (x is an arbitrary number) and a laminate of two Cr films, and a CrO _x film (x is an arbitrary number) with a reduced reflectance. , CrN _y film (y is an arbitrary number) and three layers of Cr film may be laminated. Especially, it is preferable that a black colorant is disperse | distributed or melt | dissolved in binder resin in the point that the film thickness of a light-shielding part can be made comparatively thick.

In the above case, when a printing method or an inkjet method is used as a method for forming the light shielding portion, examples of the binder resin include polymethyl methacrylate resin, polyacrylate resin, polycarbonate resin, polyvinyl alcohol resin, polyvinyl pyrrolidone resin, hydroxy Examples thereof include ethyl cellulose resin, carboxymethyl cellulose resin, polyvinyl chloride resin, melamine resin, phenol resin, alkyd resin, epoxy resin, polyurethane resin, polyester resin, maleic acid resin, polyamide resin and the like.
In the above case, when a photolithography method is used as a method for forming the light shielding portion, the binder resin may be, for example, an acrylate-based, methacrylate-based, polyvinyl cinnamate-based, or cyclized rubber-based reactive material. A photosensitive resin having a vinyl group is used. In this case, a photopolymerization initiator may be added to the photosensitive resin composition for forming a light-shielding part containing a black colorant and a photosensitive resin, and further a sensitizer, a coating property improver, if necessary. A development improver, a crosslinking agent, a polymerization inhibitor, a plasticizer, a flame retardant, and the like may be added.

  On the other hand, when the light shielding part is a metal thin film, the method for forming the light shielding part is not particularly limited as long as the light shielding part can be patterned. For example, a photolithography method or a mask is used. The vapor deposition method, the printing method, etc. can be mentioned.

  The thickness of the light shielding portion is set to about 0.2 μm to 0.4 μm in the case of a metal thin film, and about 0.5 μm to 2 μm in the case where a black colorant is dispersed or dissolved in a binder resin. Is set.

4). Color filter for IPS The color filter for IPS of the present invention is a phthalocyanine-based material having a transparent base material, a light-shielding part formed on the transparent base material, and a phthalocyanine-based colorant formed in the opening of the light-shielding part. A colored layer containing a colored portion and a non-phthalocyanine-based colored portion having a non-phthalocyanine-based colorant, and not including a transparent protective layer, wherein the color filter for IPS includes the above-mentioned on the tapered portion of the phthalocyanine-based colored portion It is not particularly limited as long as a non-phthalocyanine colored portion is formed, and may have a columnar spacer, an alignment film, or the like.

  The columnar spacers used in the present invention are not particularly limited as long as the thickness (cell gap) of the liquid crystal layer can be kept constant when the IPS color filter of the present invention is used in a liquid crystal display device. It is not something. Specifically, examples of the shape of the columnar spacer include a columnar shape, a prismatic shape, and a truncated cone shape.

  The position where the columnar spacer is formed is not particularly limited as long as it is on the light shielding portion, that is, a non-pixel region.

  The size of the bottom surface of the columnar spacer is appropriately selected depending on the size of the non-pixel region, the size of the IPS color filter, and the like.

  The height of the columnar spacer is not particularly limited. However, when the color filter for IPS of the present invention is used in a liquid crystal display device, it is preferably about the same as the cell gap. Specifically, the height of the columnar spacer is preferably about 0.5 μm to 10 μm, more preferably in the range of 1 μm to 8 μm. The number of columnar spacers is not particularly limited as long as the cell gap can be kept constant when the IPS color filter of the present invention is used in a liquid crystal display device. It is appropriately selected depending on the size of the color filter for use.

  As a material of the columnar spacer, a material used for a columnar spacer in a general color filter can be used, and examples thereof include a photosensitive resin.

When the IPS color filter of the present invention is applied to a liquid crystal display device, an alignment film is usually provided.
The alignment film is not particularly limited as long as it has an alignment function for aligning liquid crystal molecules, and examples thereof include a photo alignment film and a rubbing alignment film.
The thickness of the alignment film can be about 500 to 1500 mm.

B. Manufacturing Method of IPS Color Filter Next, a manufacturing method of the IPS color filter of the present invention will be described. The method for producing a color filter for IPS of the present invention comprises a transparent substrate, a light shielding portion formed on the transparent substrate, a phthalocyanine colored portion having a phthalocyanine colorant, and a non-phthalocyanine having a non-phthalocyanine colorant. A method for producing an IPS color filter having a non-phthalocyanine-based colored portion formed on a tapered portion of the phthalocyanine-based colored portion, wherein the non-phthalocyanine-based colored portion is formed on the tapered portion of the phthalocyanine-based colored portion. A phthalocyanine-based colored portion forming step for forming the phthalocyanine-based colored portion at least in the opening of the light-shielding portion; and a non-phthalocyanine-based coloring for forming the non-phthalocyanine-based colored portion in at least the opening of the light-shielding portion. At least a colored layer forming step having a part forming step, after the last phthalocyanine colored part forming step Takes place, the non-phthalocyanine colored portion forming step, also on the tapered part of the phthalocyanine-based coloring unit, and is characterized in that it is to form the non-phthalocyanine colored portion.

  A method for manufacturing such an IPS color filter of the present invention will be described with reference to the drawings. FIG. 2 is a process diagram showing an example of a method for producing an IPS color filter of the present invention. According to FIG. 2, an IPS color filter substrate 20 having a transparent base material 1 and a light shielding part 2 formed on the transparent base material 1 is prepared (FIG. 2A). Next, a phthalocyanine-based colored part forming composition 13 having a phthalocyanine-based colorant is applied to the entire surface of the IPS color filter substrate 20, and the coated phthalocyanine-based colored part-forming composition 13 is shielded from light. Ultraviolet rays 31 are irradiated through a mask 30 having a transmission region at a position corresponding to the opening of the portion 2 (FIG. 2B) and developed to form the phthalocyanine colored portion 3 (FIG. 2C). ).

Next, a non-phthalocyanine-based colored portion forming composition 14 having a non-phthalocyanine-based colorant is applied to the entire surface of the IPS color filter substrate 20, and the coated non-phthalocyanine-based colored portion-forming composition 14 is applied. Is irradiated with ultraviolet rays 31 through a mask 30 having a transmission region at a position corresponding to the opening of the light shielding part 2, the light shielding part 2 and the tapered part 3b of the phthalocyanine coloring part 3 (FIG. 2D). ) Next, by development, a non-phthalocyanine-based colored portion 4 is formed, and an IPS color filter 10 is formed (FIG. 2E).
Here, FIGS. 2B to 2C are phthalocyanine-based colored portion forming steps, and FIGS. 2D to 2E are non-phthalocyanine-based colored portion forming steps.
Of the phthalocyanine-based colored portion 3, the portion on the opening of the light-shielding portion 2 and the portion having a uniform thickness is the flat portion 3a, formed on the light-shielding portion 2, and the flat portion 3a. The portion where the thickness is thinner is the tapered portion 3b. In addition, the thickness of the said colored layer means the distance from the said transparent base material surface to the surface of the said colored layer. The term “on the light shielding part” includes not only the light shielding part but also the flat part of the phthalocyanine-based colored part formed on the light shielding part.

According to the present invention, the non-phthalocyanine colored portion forming step performed after the final phthalocyanine colored portion forming step forms the non-phthalocyanine colored portion also on the tapered portion of the phthalocyanine colored portion. Accordingly, the tapered portion of the phthalocyanine-based colored portion can be covered with the non-phthalocyanine-based colored portion.
For this reason, the color filter for IPS manufactured using the manufacturing method of this invention can make a little elution to the liquid crystal layer of a phthalocyanine type coloring agent. As a result, the contamination of the liquid crystal can be prevented and the display quality can be improved.

  The manufacturing method of the color filter for IPS of this invention has a colored layer formation process at least. Hereinafter, the manufacturing method of the color filter for IPS of this invention is demonstrated.

1. Colored layer forming step The colored layer forming step used in the present invention includes a colored layer forming step having a phthalocyanine-based colored portion forming step and a non-phthalocyanine-based colored portion forming step.

(1) Phthalocyanine-based colored part forming step The phthalocyanine-based colored part forming step used in the present invention includes the phthalocyanine-based colored part at least in the opening of the light-shielding part on the transparent substrate on which the light-shielding part is formed. It is a process of forming. The method for forming such a phthalocyanine-based colored portion is not particularly limited as long as it is a method capable of accurately forming the phthalocyanine-based colored portion in a desired region. For example, a phthalocyanine-based colorant is used. Examples thereof include a method of forming a phthalocyanine-based colored portion forming composition by coating, exposing and developing.

  Here, examples of the composition for forming a phthalocyanine-based colored part used in this step include those having the above phthalocyanine-based colorant and a photosensitive resin. As the phthalocyanine-based colorant and the photosensitive resin used in this step, the same contents as those described in the above section “A. Color filter for IPS” can be used. Omitted.

  Further, the coating method of the phthalocyanine-based colored portion forming composition is not particularly limited as long as it is a method capable of applying the phthalocyanine-based colored portion forming composition. For example, spin coating A general method such as a method, a spray coating method, a dip coating method, a roll coating method, a bead coating method, or a bar coating method can be used.

  The coating film coated with the phthalocyanine-based colored part forming composition can be exposed to energy by using, for example, a photomask. As a light source used for exposure, a light source generally used for forming a colored layer can be used, and examples thereof include an ultrahigh pressure mercury lamp, a low pressure mercury lamp, and a metal halide lamp.

  Further, the developing method is not particularly limited as long as it is possible to remove the coating film coated with the unnecessary portion of the phthalocyanine-based colored portion forming composition. The development method performed at the time can be used.

  Moreover, this process has a colored part formation process of each color for every colored part of each color normally. Examples of such a colored portion forming step for each color include a colored portion forming step for one or more colors of green, blue, and cyan. In this step, it is preferable to have at least a green colored portion forming step and a blue colored portion forming step. The color filter usually has a colored layer including colored portions of at least three primary colors of red, blue, and green, and is included in the colored portions of blue and green among the colored portions of the three primary colors of red, blue, and green. This is because a phthalocyanine colorant is generally used because the colorant to be used is excellent in color developability, durability and the like.

In the colored layer forming step used in the present invention, the order of carrying out the phthalocyanine-based colored portion forming step is particularly as long as it has a non-phthalocyanine-based colored portion forming step to be described later after the last phthalocyanine-based colored portion forming step. Although not limited, when the phthalocyanine-based colored portion forming step includes a halogenated phthalocyanine-based colored portion forming step, the halogenated phthalocyanine-based colored portion forming step is first performed during the colored layer forming step. It is preferable to be implemented.
When the halogenated phthalocyanine-based colored portion forming step is first performed during the colored layer forming step, the color filter for IPS manufactured by the manufacturing method of the present invention is reduced in reliability among phthalocyanine-based colorants. This is because the elution of the halogenated phthalocyanine pigment having a large influence on the amount can be reduced.
The halogenated phthalocyanine-based colored portion forming step is a step of forming a phthalocyanine-based colored portion using the halogenated phthalocyanine-based colorant as the phthalocyanine-based colorant.

  In addition, as a transparent base material and light-shielding part used for this process, what is used for a general color filter can be used, and specifically, it describes in the above-mentioned item of "A. IPS color filter". Can be used.

(2) Non-phthalocyanine-based colored portion forming step The non-phthalocyanine-based colored portion forming step used in the present invention is a step of forming the non-phthalocyanine-based colored portion at least in the opening of the light-shielding portion. It is always performed once after the phthalocyanine-based colored portion forming step, and at that time, the non-phthalocyanine-based colored portion is also formed on the tapered portion of the phthalocyanine-based colored portion.

As a method for forming such a non-phthalocyanine-based colored portion, a method of applying a composition for forming a non-phthalocyanine-based colored portion having a non-phthalocyanine-based colorant and a photosensitive resin, and exposing and developing can be used. The non-phthalocyanine colorant and the photosensitive resin may be the same as those described in the section “A. Color filter for IPS”, and therefore the description thereof is omitted here. .
Moreover, as a method of applying the composition for forming a non-phthalocyanine-based colored portion, exposing and developing, the same method as in the above “(1) phthalocyanine-based colored portion forming step” can be used.

  Moreover, this process has a colored part formation process of each color for every colored part of each color normally. Examples of the colored portion forming step for each color include a colored portion forming step for one or more of red, green, blue, and yellow. In this step, it is preferable to have at least a red colored portion forming step. The color filter usually has a colored layer including colored portions of at least three primary colors of red, blue, and green, and is included in the colored portions of blue and green among the colored portions of the three primary colors of red, blue, and green. The colorant to be used is generally a phthalocyanine colorant because it is excellent in color developability, durability and the like. For this reason, when the non-phthalocyanine colored portion has a red colored portion, the phthalocyanine colored portion and the non-phthalocyanine colored portion are surely included in the colored portions of the three primary colors of red, blue, and green. Because it can be done.

  In the colored layer forming step used in the present invention, the non-phthalocyanine-based colored portion forming step is particularly limited as long as it is performed at least once after the final phthalocyanine-based colored portion forming step. Instead, for example, when the non-phthalocyanine colored portion forming step has two or more types of colored portion forming step, the colored portion forming step of any one color is used as the last phthalocyanine colored portion. It is good also as what is implemented after a formation process and implements the remaining colored part formation process before the said last phthalocyanine type colored part formation process.

  In addition, when the non-phthalocyanine-based colored portion forming step has two or more types of colored portion-forming steps after the last phthalocyanine-based colored portion forming step, any one of the colored portion-forming steps However, the non-phthalocyanine-based colored portion may be formed on the tapered portion of the phthalocyanine-based colored portion, and two or more colored portions may be formed on the tapered portion of the phthalocyanine-based colored portion. In addition, a non-phthalocyanine colored portion may be formed. In this step, any of them can be suitably used. Among them, the colored portion forming step of any one color forms a non-phthalocyanine colored portion on the tapered portion of the phthalocyanine colored portion. It is preferable. This is because elution of the phthalocyanine colorant from the tapered portion of the phthalocyanine color portion into the liquid crystal layer can be sufficiently prevented only by forming one layer of the non-phthalocyanine color portion.

(3) Colored layer forming step The colored layer including the phthalocyanine-based colored portion and the non-phthalocyanine-based colored portion formed in this step has the same contents as those described in the above section “A. Color filter for IPS”. Because there are, description here is omitted.

2. Other steps The method for producing a color filter for IPS of the present invention is not particularly limited as long as it has at least the phthalocyanine-based colored portion forming step and the non-phthalocyanine-based colored portion forming step, and has other steps. It may be a thing.
Examples of such other processes include an alignment film forming process and a columnar spacer forming process.

  As said alignment film formation process, organic compounds, such as a soluble polyimide, a polyamic acid type polyimide, and a modified polyimide, are apply | coated by a general printing method and the apply | coating method, and can be formed by baking after that. Such an alignment film does not require alignment treatment (rubbing).

  As the columnar spacer forming step, for example, the above-described photosensitive resin is applied by a general printing method or a coating method, and then exposed through a mask having a transmission region and a light shielding region, and then developed. A columnar spacer having a desired height can be formed at the position.

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

  Next, the present invention will be described more specifically with reference to examples and comparative examples.

[Example 1]
1. Formation of light shielding part As a transparent substrate for a color filter, a glass substrate (Asahi Glass Co., Ltd. AN material) having a size of 100 mm × 100 mm and a thickness of 0.7 mm was prepared. After this substrate was washed according to a conventional method, a photosensitive resin composition (CFPR DN-83 manufactured by Tokyo Ohka Kogyo Co., Ltd.) was applied to the entire surface of one side of the substrate, and exposed and developed through a predetermined mask. Thereafter, the substrate was left to stand in an atmosphere of 230 ° C. for 30 minutes to perform heat treatment, thereby forming a light shielding portion (thickness D = 1.5 μm) in a region where the light shielding portion was to be formed.

2. Formation of colored layer On the transparent substrate on which the light-shielding portion is formed as described above, a green curable resin composition having the following composition was applied by spin coating (coating thickness: 2.0 μm), and then a hot plate at 80 ° C. For 3 minutes. Next, a photomask is placed at a distance of 150 μm from the coating film of the green curable resin composition, and a proximity aligner is used only in a region corresponding to a region where a green pixel is to be formed using a 2.0 kW ultrahigh pressure mercury lamp. Ultraviolet rays were irradiated for 10 seconds. Subsequently, it was immersed in 0.05 wt% potassium hydroxide aqueous solution (liquid temperature 23 degreeC) for 1 minute, and alkali development was carried out, and only the uncured part of the coating film of the green curable resin composition was removed. Thereafter, the substrate was left in an atmosphere of 230 ° C. for 30 minutes to perform a heat treatment to form a green relief pattern in a region where a green pixel was to be formed, thereby obtaining a phthalocyanine-based green colored portion.

Next, using a blue curable resin composition having the following composition, a blue relief pattern is formed in a region where a blue pixel is to be formed in the same process as the formation of the phthalocyanine green colored portion, and the phthalocyanine blue colored portion Got.
In this manner, a phthalocyanine-based colored portion having the phthalocyanine-based green colored portion and the phthalocyanine-based blue colored portion was formed.

  Next, using a red curable resin composition having the following composition, in the same process as the formation of the phthalocyanine-based green colored portion, on the region where the red pixel is to be formed and the tapered portion of the phthalocyanine-based colored portion, non-phthalocyanine A red colored portion was formed, and a colored layer composed of three colors of red (R), green (G), and blue (B) was formed.

<Composition of green curable resin composition>
-Halogenated phthalocyanine-based green colorant (CI Pigment Green 36): 6.0 parts by weight-Dispersant (Solpers 24000, manufactured by Avicia): 3.0 parts by weight- Monomer (SR399, manufactured by Sartomer): 4. 0 parts by weight-Polymer I: 5.0 parts by weight-Initiator (Irgacure 907 manufactured by Ciba Specialty Chemicals): 1.4 parts by weight-Initiator (2,2'-bis (o-chlorophenyl) -4, 5,4 ′, 5′-tetraphenyl-1,2′-bisimidazole): 0.6 parts by weight / solvent (propylene glycol monomethyl ether acetate): 80.0 parts by weight <composition of blue curable resin composition>
Phthalocyanine blue colorant (CI Pigment Blue 15: 6): 6.0 parts by weight Pigment derivative (Solsperse 12000, manufactured by Avicia): 0.6 parts by weight Dispersant (Solpers 24000, manufactured by Avicia): 2.4 parts by weight / monomer (SR399 manufactured by Sartomer): 4.0 parts by weight / Polymer I: 5.0 parts by weight
Initiator (Irgacure 907 manufactured by Ciba Specialty Chemicals): 1.4 parts by weight Initiator (2,2'-bis (o-chlorophenyl) -4,5,4 ', 5'-tetraphenyl-1 , 2'-bisimidazole): 0.6 parts by weight. Solvent (propylene glycol monomethyl ether acetate): 80.0 parts by weight <Composition of red curable resin composition>
Non-phthalocyanine-based red colorant (CI Pigment Red 177): 6.0 parts by weight Dispersant (Solpers 24000 manufactured by Avicia): 3.0 parts by weight Monomer (SR399 manufactured by Sartomer): 4.0 Part by weight-Polymer I: 5.0 parts by weight-Initiator (Irgacure 907 manufactured by Ciba Specialty Chemicals): 1.4 parts by weight-Initiator (2,2'-bis (o-chlorophenyl) -4,5 , 4 ', 5'-tetraphenyl-1,2'-bisimidazole): 0.6 parts by weight Surfactant (Nonion HS-210, manufactured by NOF Corporation): 1.0 part by weight, solvent (propylene) Glycol monomethyl ether acetate): 79.0 parts by weight

  The polymer I is based on 100 mol% of a copolymer of benzyl methacrylate: styrene: acrylic acid: 2-hydroxyethyl methacrylate = 15.6: 37.0: 30.5: 16.9 (molar ratio). 2-methacryloyloxyethyl isocyanate was added at 16.9 mol%, and the weight average molecular weight was 42500.

3. Preparation of Liquid Crystal Cell An alignment film made of polyimide was formed on the film forming surface of the color filter obtained as described above. After a bead spacer having a particle diameter of 6 μm was sprayed on the glass substrate, the glass substrate on which the transverse electric field transparent electrode was formed was pasted and the periphery was hardened with an epoxy adhesive to form an empty cell. A nematic liquid crystal having positive dielectric anisotropy was injected into the liquid crystal, and the liquid crystal injection port was sealed with an epoxy adhesive to produce a liquid crystal cell.

4. Reliability Evaluation of Liquid Crystal Cell The voltage holding ratio (VHR) of the liquid crystal cell obtained as described above was measured and showed a high value of 99% in the initial stage. Subsequently, when this liquid crystal cell was heated in an oven at 105 ° C. for 168 hours and VHR was measured, it showed a high value of 97%. The voltage holding ratio was measured by using a VHR-1 type manufactured by Toyo Technica Co., Ltd., and applying ± 5 V to the liquid crystal cell under the conditions of a pulse width of 10 μs and a frequency of 60 Hz.

[Example 2]
After obtaining a color filter by the same method as Example 1 except having used the green curable resin composition of the following composition, the liquid crystal cell was produced by the same method as Example 1. FIG. The liquid crystal cell obtained as described above was measured for VHR by the same method as in Example 1. As a result, it showed a high value of 99% in the initial stage and a high value of 97% even after heating.

<Composition of green curable resin composition>
-Halogenated phthalocyanine-based green colorant (CI Pigment Green 7): 6.0 parts by weight-Dispersant (Solpers 24000 manufactured by Avicia): 3.0 parts by weight-Monomer (SR399 manufactured by Sartomer): 4. 0 parts by weight
-Polymer I: 5.0 parts by weight-Initiator (Irgacure 907 manufactured by Ciba Specialty Chemicals): 1.4 parts by weight-Initiator (2,2'-bis (o-chlorophenyl) -4, 5, 4 ', 5'-tetraphenyl-1,2'-bisimidazole): 0.6 parts by weight / solvent (propylene glycol monomethyl ether acetate): 80.0 parts by weight

[Example 3]
Red (R), green (G), and blue (B) in the same manner as in Example 1 except that the phthalocyanine-based blue colored portion, the phthalocyanine-based green colored portion, and the non-phthalocyanine-based red colored portion were formed in this order. After obtaining a color filter having a colored layer consisting of the following three colors, a liquid crystal cell was produced in the same manner as in Example 1. The liquid crystal cell obtained as described above was measured for VHR by the same method as in Example 1. As a result, it showed a high value of 99% in the initial stage and a high value of 96% even after heating.

[Comparative example]
Using a red curable resin composition, a non-phthalocyanine-based red colored portion is formed only in a region where a red pixel is to be formed, and the non-phthalocyanine-based red colored portion is formed on the tapered portion of the phthalocyanine-based colored portion. A method similar to that in Example 1 was obtained after obtaining a color filter having a colored layer composed of three colors of red (R), green (G), and blue (B) in the same manner as in Example 1 except that there was not. A liquid crystal cell was prepared.
For the liquid crystal cell obtained as described above, VHR was measured by the same method as in Example 1. As a result, it showed a high value of 95% in the initial stage, but a reduction of VHR of 78% was observed after heating. .

  From the above, it was confirmed that the electrical reliability was improved by forming the non-phthalocyanine colored portion on the tapered portion of the phthalocyanine colored portion.

It is a schematic sectional drawing which shows an example of the color filter for IPS of this invention. It is process drawing which shows an example of the manufacturing method of the color filter for IPS of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Transparent base material 2 ... Light-shielding part 3 ... Phthalocyanine type colored part 3a ... Flat part 3b ... Tapered part 4 ... Non-phthalocyanine type colored part 5 ... Colored layer 10 ... Color filter for IPS 13 ... Composition for forming phthalocyanine type colored part 14 ... Composition for forming non-phthalocyanine colored portion 20 ... Substrate for color filter for IPS 30 ... Mask

Claims (2)

A transparent substrate;
A light shielding portion formed on the transparent substrate;
A color filter for a lateral electric field drive liquid crystal display device having a phthalocyanine-based colored portion having a phthalocyanine-based colorant and a colored layer including a non-phthalocyanine-based colored portion having a non-phthalocyanine-based colorant and not including a transparent protective layer. And
The non-phthalocyanine colored portion is formed on all the tapered portions of all the phthalocyanine colored portions,
The color filter for a horizontal electric field drive liquid crystal display device, wherein the phthalocyanine-based colored portion has a green colored portion and a blue colored portion, and the non-phthalocyanine-based colored portion has a red colored portion. A transparent substrate;
A light shielding portion formed on the transparent substrate;
A phthalocyanine-based colored part having a phthalocyanine-based colorant and a colored layer having a non-phthalocyanine-based colored part having a non-phthalocyanine-based colorant, and not including a transparent protective layer, and all of the phthalocyanine-based colored parts The non-phthalocyanine-based colored portion is formed on the tapered portion ,
Furthermore, the phthalocyanine-based colored portion has a green colored portion and a blue colored portion, and the non-phthalocyanine-based colored portion has a red colored portion, a method for producing a color filter for a lateral electric field drive liquid crystal display device,
A phthalocyanine colored portion forming step for forming the phthalocyanine colored portion at least in the opening of the light shielding portion;
At least a colored layer forming step having a non-phthalocyanine-based colored portion forming step for forming the non-phthalocyanine-based colored portion at the opening of the light-shielding portion;
The non-phthalocyanine colored portion forming step performed after the last phthalocyanine colored portion forming step is to form the non-phthalocyanine colored portion on the tapered portion of the phthalocyanine colored portion,
A color filter for a lateral electric field driving liquid crystal display device, characterized in that the halogenated phthalocyanine-based colored portion forming step included in the phthalocyanine-based colored portion forming step is first performed during the colored layer forming step. Production method.

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