KR20120120353A - Color filter and color liquid crystal display element - Google Patents

Abstract

The present invention provides a color filter having high brightness and excellent visibility when a white LED is used as a backlight light source. The color filter of this invention is a color filter used for the liquid crystal display element which has the color filter which has a red pixel, a green pixel, and a blue pixel, and the backlight light source arrange | positioned at the back side, A red pixel is a (1) CI pigment. And red (242) and (2) at least one selected from the group consisting of CI pigment red 177 and CI pigment red 254, wherein the backlight light source is a white LED.

Description

COLOR FILTER AND COLOR LIQUID CRYSTAL DISPLAY ELEMENT}

The present invention relates to a color filter comprising a red pixel containing a specific organic pigment and a color liquid crystal display device comprising the same.

Background Art In recent years, color liquid crystal display devices have been used for various uses such as monitors of personal computers (PCs), displays of mobile phones, notebook PCs, portable information terminals, televisions, and the like from the advantages of low power consumption and space saving.

As a light source for a backlight included in a color liquid crystal display device, a conventional Cold Cathode Fluorescent Lamp (CCFL) has been used. However, from a recent global demand for environmental protection and energy saving, it is smaller and lighter than CCFL. In addition, low power consumption, mercury-free white LED is attracting attention. For example, Patent Document 1 proposes a color filter having a red pixel containing C.I. Pigment Red 177 or C.I.Pigment Red 254 as a color filter suitable for a liquid crystal display device using a white LED as a light source.

International Publication No. 2007/102386

However, in such a red pixel, the applied power must be increased in order to obtain high luminance (Y value), and thus the advantage of the white LED, which is low power consumption, cannot be fully utilized. In addition, the contrast ratio is insufficient as a conventional red pixel containing CI Pigment Red 254, and there is a problem that the black display part has a red hue when the contrast ratio of the red pixel is lower than that of the blue pixel. . On the other hand, when the contrast ratio of a red pixel is too high compared with the contrast ratio of a blue pixel, there also existed a problem that a black display part has a blue hue.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a color filter having high brightness and excellent visibility when a white LED is used as a backlight light source.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining, the present inventors solved the said subject by containing CI pigment red 242 further in at least 1 sort (s) chosen from the group which consists of CI pigment red 177 and CI pigment red 254 in the red pixel of a color filter. It has been found that the present invention has been completed.

That is, this invention is a color filter used for the liquid crystal display element which has the color filter which has a red pixel, a green pixel, and a blue pixel, and the backlight light source arrange | positioned at the back side,

The red pixel comprises at least one selected from the group consisting of (1) C.I. Pigment Red 242 and (2) C.I. Pigment Red 177 and C.I.Pigment Red 254,

It is to provide a color filter, characterized in that the backlight light source is a white LED.

Moreover, this invention also provides the color liquid crystal display element provided with the said color filter and the white LED as a backlight light source in the back side.

The color filter of the present invention has high brightness and excellent visibility when a white LED is used as a backlight light source.

Therefore, the color filter of this invention can be used very suitably for various liquid crystal display elements, such as a monitor of a PC, a display of a mobile telephone, a notebook PC, a portable information terminal, and a television. Thereby, energy saving of these liquid crystal display elements is implement | achieved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of the light emission characteristic of the white LED which produces | generates white light by the mixed color of light emission from a blue LED and a YAG fluorescent substance.
2 is a diagram showing an example of light emission characteristics of a white LED that generates white light by mixing color of light emitted from a blue LED, a red light emitting phosphor, and a green light emitting phosphor.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

Color filter

The color filter of the present invention includes a red pixel, a green pixel, and a blue pixel, and may have fourth or fifth colored pixels in addition to these colored pixels. For example, as disclosed in Japanese Patent Laid-Open No. 2005-523465 or the like, a fourth pixel (yellow pixel) or a fifth pixel for widening the color gamut in addition to the pixels of three primary colors of red, green, and blue. (Cyan pixel) can be arranged. Each color pixel is normally comprised by the coloring composition.

Although a coloring composition contains a coloring agent, binder resin, and a polyfunctional monomer at least, a radiation sensitive property can be provided to a coloring composition by containing a photoinitiator as needed. In addition, a coloring composition is mix | blended with a solvent and is used as a liquid composition normally. Hereinafter, each component is demonstrated.

-Colorant in Red Pixel-

The red pixel which comprises the color filter of this invention contains (1) CI pigment red 242, and (2) at least 1 sort (s) chosen from the group which consists of CI pigment red 177 and CI pigment red 254, It is characterized by the above-mentioned. It is done. 1 shows a representative emission spectrum of a white LED that produces white light by mixing color of light emitted from a blue LED and a YAG phosphor.

The present inventors have determined that the transmittance in the wavelength band of 430 nm to 470 nm in which the luminous intensity of the blue LED is maximum is as low as possible, and the transmittance in the wavelength band of 500 nm or more in which the luminous intensity is weaker than the blue LED is as high as possible. By adjusting the transmission spectrum of the pixel, it was considered that both high luminance and high color purity can be realized. And as a result of earnest examination, CI pigment red 242 whose transmittance | permeability in the wavelength band of 430 nm-470 nm is lower than CI pigment red 177, and the transmittance in the wavelength band of 500 nm or more is higher than CI pigment red 254 is red. It was found to be effective as a colorant used for pixels.

The red pixel which comprises the color filter of this invention is specifically limited if it contains at least 1 sort (s) chosen from the group which consists of (1) CI pigment red 242 and (2) CI pigment red 177 and CI pigment red 254. And may contain other red and / or yellow colorants. Although it does not specifically limit as another red coloring agent or a yellow coloring agent, Organic pigment or organic dye is preferable at the point of codispersion with C.I. Pigment Red 242, Especially organic pigment is preferable. As such a red or yellow organic pigment, for example, a compound classified as a pigment in a color index (CI; issued by The Society of Dyers and Colourists, Inc.), specifically, a compound having the following color index (CI) name is attached. Can be mentioned.

CI Pigment Red 1, CI Pigment Red 2, CI Pigment Red 5, CI Pigment Red 17, CI Pigment Red 31, CI Pigment Red 32, CI Pigment Red 41, CI Pigment Red 122, CI Pigment CI Pigment Red 123, CI Pigment Red 144, CI Pigment Red 149, CI Pigment Red 166, CI Pigment Red 168, CI Pigment Red 170, CI Pigment Red 171, CI Pigment Red 175, CI Pigment Red 176, CI Pigment Red 178, CI Pigment Red 179, CI Pigment Red 180, CI Pigment Red 185, CI Pigment Red 187, CI Pigment Red 202, CI Pigment Red 206, CI Pigment Red 207, CI Pigment Red 209, CI Pigment Red 214, CI Pigment Red 220, CI Pigment Red 221, CI Pigment Red 224, CI Pigment Red 243, CI Pigment Red 255, CI Pigment Red 262, CI Pigment Cement Red 264, CI Pigment Red 272;

CI Pigment Yellow 12, CI Pigment Yellow 13, CI Pigment Yellow 14, CI Pigment Yellow 17, CI Pigment Yellow 20, CI Pigment Yellow 24, CI Pigment Yellow 31, CI Pigment Yellow 55, CI Pigment CI Pigment Yellow 83, CI Pigment Yellow 93, CI Pigment Yellow 109, CI Pigment Yellow 110, CI Pigment Yellow 138, CI Pigment Yellow 139, CI Pigment Yellow 150, CI Pigment Yellow 153, CI Pigment Yellow 154, CI Pigment Yellow 155, CI Pigment Yellow 166, CI Pigment Yellow 168, CI Pigment Yellow 180, CI Pigment Yellow 211.

In addition, an inclusion compound comprising a host represented by the following general formula (I) or a tautomer thereof as a yellow pigment and a guest represented by the following general formula (II) (hereinafter sometimes referred to as a "specific yellow pigment") You can also use

(In formula (II), R ^a to R ^c represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms which may be substituted independently.)

Herein, the alkyl group having 1 to 4 carbon atoms in R ^a to R ^c may be any of linear or branched form, and specifically, methyl group, ethyl group, n-propyl group, isopropyl group, cyclopropyl group, n-butyl Group, sec-butyl group, tert-butyl group, etc. are mentioned. Moreover, as a C1-C4 alkyl group by which the hydroxyl group is substituted, the group which substituted at least 1 hydrogen atom of the said alkyl group with a hydroxyl group is mentioned, Specifically, hydroxymethyl, 2-hydroxyethyl, 1, 2-dihydroxypropyl, 1,2,3-trihydroxybutyl, etc. are mentioned.

In the red pixel which comprises the color filter of this invention, these other red pigment or yellow pigment can be used individually or in mixture of 2 or more types.

The color filter of the present invention is used for a relatively low color purity such as a notebook PC, in other words, the chromaticity coordinates of the red pixels to be reproduced in the CIE1931 standard color system are 0.50 ≦ x ≦ 0.64, 0.27 ≦ y ≦ 0.37, preferably 0.53 ≦ x < When used in the range of 0.62 and 0.28 ≤ y ≤ 0.37, the red pixel constituting the color filter of the present invention contains CI Pigment Red 242 and CI Pigment Red 254, and if necessary, a yellow pigment or another red pigment. It is preferable to colorize by. In that case, it is preferable that the content rate of each pigment is 1-74 mass% of CI pigment red 242, and 1-84 mass% of CI pigment red 254 among all the coloring agents which comprise a red pixel, and CI pigment red It is more preferable that 242 is 20-80 mass%, and CI pigment red 254 is 10-70 mass%, and that CI pigment red 242 is 50-70 mass%, CI pigment red 254 is 20-48 mass% Particularly preferred.

In addition, the color filter of the present invention has a high color purity such as a television, that is, a chromaticity coordinate to be reproduced in a CIE1931 standard color system is 0.60 ≦ x ≦ 0.69, 0.25 ≦ y ≦ 0.38, preferably 0.62 ≦ x ≦ 0.68. When used in the range of 0.28? Y? 0.38, the red pixel constituting the color filter of the present invention contains CI Pigment Red 242 and CI Pigment Red 177 and, if necessary, is applied to a yellow pigment or another red pigment. It is preferable to colorize by. In that case, it is preferable that the content rate of each pigment is 1-61 mass% of CI pigment red 242 and 1-76 mass% of CI pigment red 177 among all the coloring agents which comprise a red pixel, and CI pigment red It is more preferable that 242 is 10-60 mass%, and CI pigment red 177 is 30-75 mass%, and that CI pigment red 242 is 20-50 mass% and CI pigment red 177 is 50-70 mass% desirable.

As a yellow pigment used for coloring, C.I. pigment yellow 139, C.I. pigment yellow 150, and a specific yellow pigment are preferable regardless of a use.

By setting it as the above aspect, when a white LED is used as a backlight light source, it can be set as the red pixel with high brightness and contrast ratio.

-Colorant contained in green pixel-

The green pixel constituting the color filter of the present invention is not particularly limited as long as it contains a green colorant. However, since the color filter requires high purity, high light transmittance, color development and heat resistance, it is preferable to include a green organic pigment or an organic dye. It is preferable and it is especially preferable to contain a green organic pigment. As a green organic pigment, C.I. pigment green 7, C.I. pigment green 10, C.I. pigment green 36, C.I. pigment green 37, C.I. pigment green 58, etc. are mentioned, for example.

In this invention, these green organic pigments can be used individually or in mixture of 2 or more types. It is preferable that the green pixel which comprises the color filter of this invention contains at least 1 sort (s) chosen from the group which consists of CI pigment green 7, CI pigment green 36, and CI pigment green 58 from the point of brightness and color purity, It is preferable to contain CI pigment green 58 especially.

It is preferable that the green pixel which comprises the color filter of this invention contains a yellow coloring agent further. Although it does not specifically limit as a yellow coloring agent which a green pixel contains, An organic pigment or an organic dye is preferable, and an organic pigment is especially preferable. As such a yellow organic pigment, the thing similar to the yellow organic pigment illustrated in the said red pixel is mentioned.

In the green pixel which comprises the color filter of this invention, the said yellow organic pigment can be used individually or in mixture of 2 or more types. It is preferable that the green pixel which comprises the color filter of this invention contains at least 1 sort (s) chosen from the group which consists of CI pigment yellow 138, CI pigment yellow 150, and a specific yellow pigment among the said yellow organic pigments, Especially It is preferable to contain a specific yellow pigment.

The green pixel which comprises the color filter of this invention is at least 1 sort (s) chosen from the group which consists of CI pigment green 7, CI pigment green 36, and CI pigment green 58 among all the coloring agents which comprise a green pixel, regardless of a use. It is preferable to contain 10-60 mass% of at least 1 sort (s) chosen from the group which consists of 40-90 mass%, CI pigment yellow 138, CI pigment yellow 150, and a specific yellow pigment, CI pigment green 7, CI 50-80 mass%, CI pigment yellow 138, CI pigment yellow 150, and at least 1 sort (s) chosen from the group which consists of at least 1 sort (s) chosen from the group which consists of Pigment Green 36 and CI Pigment Green 58. It is more preferable to contain 20-50 mass%. With such an aspect, when the white LED is used as a backlight light source, a green pixel having high luminance and color purity can be obtained.

-Colorant in Blue Pixel-

The blue pixel constituting the color filter of the present invention is not particularly limited as long as it contains a blue colorant. However, since the color filter requires high purity, high light transmittance, color development and heat resistance, it is preferable to include a blue organic pigment or an organic dye. It is preferable and it is especially preferable to contain a blue organic pigment. As a blue organic pigment, CI pigment blue 15, CI pigment blue 15: 3, CI pigment blue 15: 4, CI pigment blue 15: 6, CI pigment blue 60, CI pigment blue 80, for example Etc. can be mentioned.

In this invention, these blue organic pigments can be used individually or in mixture of 2 or more types. It is preferable that the blue pixel which comprises the color filter of this invention contains C.I. pigment blue 15: 6 from the point of brightness and color purity.

It is preferable that the blue pixel which comprises the color filter of this invention contains a purple coloring agent further. Although it does not specifically limit as a purple coloring agent which a blue pixel contains, An organic pigment or an organic dye is preferable, and an organic pigment is especially preferable. Examples of such purple organic pigments include CI pigment violet 1, CI pigment violet 19, CI pigment violet 23, CI pigment violet 29, CI pigment violet 32, CI pigment violet 36, and CI pigment violet. 38 etc. can be mentioned.

In the blue pixel which comprises the color filter of this invention, the said purple organic pigment can be used individually or in mixture of 2 or more types. It is preferable that the blue pixel which comprises the color filter of this invention contains C.I. pigment violet 23 among the said purple organic pigments.

The blue pixel which comprises the color filter of this invention contains 60-100 mass% of CI pigment blue 15: 6 and 0-40 mass% of CI pigment violet 23 among all the coloring agents which comprise a blue pixel, regardless of a use. It is preferable to, and it is more preferable to contain 70-100 mass% and CI pigment violet 23 of CI pigment blue 15: 6 0-30 mass%. With such an aspect, when the white LED is used as a backlight light source, a blue pixel with high luminance and color purity can be obtained.

In the present invention, colorants such as C.I. Pigment Red 242 may be used by modifying the particle surface thereof with a resin as necessary. As resin which modifies the particle surface of a pigment, the vehicle resin of Unexamined-Japanese-Patent No. 2001-108817, or resin for disperse | distributing various pigments marketed are mentioned, for example. In addition, it is preferable to use organic pigments, such as C.I. Pigment Red 242, by miniaturizing the primary particles by salt milling. As a method of salt milling, the method disclosed by Unexamined-Japanese-Patent No. 08-179111 can be employ | adopted, for example. The organic pigments may also be purified by recrystallization, reprecipitation, solvent washing, sublimation, vacuum heating, or a combination thereof.

-Binder Resin-

The coloring composition for forming each color pixel which comprises the color filter of this invention can contain binder resin. As a result, a coating film can be formed on the substrate, and a pixel pattern can be formed by alkali development. Although it does not specifically limit as such binder resin, It is preferable that it is resin which has acidic functional groups, such as a carboxyl group, a phenolic hydroxyl group, and a sulfo group. Especially, the polymer which has a carboxyl group (henceforth a "carboxyl group-containing polymer") is preferable, and the ethylenically unsaturated monomer which has especially one or more carboxyl groups (henceforth "unsaturated monomer (1)") and And a copolymer of another copolymerizable ethylenically unsaturated monomer (hereinafter may be referred to as "unsaturated monomer (2)") is preferable.

Examples of the unsaturated monomer (1) include (meth) acrylic acid, maleic acid, maleic anhydride, monosuccinic acid [2- (meth) acryloyloxyethyl], and ω-carboxypolycaprolactone mono (meth) acrylate. Etc. can be mentioned. These unsaturated monomers (1) can be used individually or in mixture of 2 or more types.

Moreover, as said unsaturated monomer (2), for example,

N-position substituted maleimides such as N-phenylmaleimide and N-cyclohexylmaleimide;

Aromatic vinyl compounds such as styrene, α-methylstyrene, p-hydroxystyrene, p-hydroxy-α-methylstyrene, p-vinylbenzyl glycidyl ether, acenaphthylene;

Methyl (meth) acrylate, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, allyl (meth) acrylate, benzyl (meth) acrylate , Polyethylene glycol (n = 2 to 10) methyl ether (meth) acrylate, polypropylene glycol (n = 2 to 10) methyl ether (meth) acrylate, polyethylene glycol (n = 2 to 10) mono (meth ) Acrylate, polypropylene glycol (n = 2 to 10) mono (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, tricyclo [5.2.1.0 ^2,6 ] decane- Ethylene oxide modified (meth) acrylates of 8-yl (meth) acrylate, dicyclopentenyl (meth) acrylate, glycerol mono (meth) acrylate, 4-hydroxyphenyl (meth) acrylate, paracumylphenol Glycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) (Meth) acrylic acid esters such as acrylate, 3-[(meth) acryloyloxymethyl] oxetane and 3-[(meth) acryloyloxymethyl] -3-ethyl oxetane;

Cyclohexyl vinyl ether, isobornyl vinyl ether, tricyclo [5.2.1.0 ^2,6 ] decan-8-yl vinyl ether, pentacyclopentadecanyl vinyl ether, 3- (vinyloxymethyl) Vinyl ethers such as; And macromonomers having a mono (meth) acryloyl group at the ends of polymer molecular chains such as polystyrene, polymethyl (meth) acrylate, poly-n-butyl (meth) acrylate, and polysiloxane.

These unsaturated monomers (2) can be used individually or in mixture of 2 or more types.

In the copolymer of the unsaturated monomer (1) and the unsaturated monomer (2), the copolymerization ratio of the unsaturated monomer (1) is preferably 5 to 50 mass%, more preferably 10 to 40 mass%. By copolymerizing an unsaturated monomer (1) in such a range, the coloring composition excellent in storage stability and alkali developability can be obtained.

As a specific example of the copolymer of an unsaturated monomer (1) and an unsaturated monomer (2), For example, Unexamined-Japanese-Patent No. 7-140654, Unexamined-Japanese-Patent No. 8-259876, Unexamined-Japanese-Patent No. 9-311444, Japanese Patent Publication No. 10-31308, Japanese Patent Publication No. 10-300922, Japanese Patent Publication No. 11-174224, Japanese Patent Publication 11 The copolymer disclosed in Unexamined-Japanese-Patent No. 2000-56118, Unexamined-Japanese-Patent No. 2002-296778, Unexamined-Japanese-Patent No. 2004-101728, etc. are mentioned.

Moreover, in this invention, for example, Unexamined-Japanese-Patent No. 5-19467, Unexamined-Japanese-Patent No. 6-230212, Unexamined-Japanese-Patent No. 7-207211, Unexamined-Japanese-Patent As disclosed in Japanese Patent Application Laid-Open No. 11-140144, Japanese Patent Laid-Open No. 2008-181095, and the like, a carboxyl group-containing polymer having a polymerizable unsaturated bond such as a (meth) acryloyl group in the side chain can also be used as the binder resin.

Moreover, it is preferable to contain the binder resin which has an alicyclic hydrocarbon group in the blue pixel which comprises the color filter of this invention. As a result, the luminance of the blue pixel can be further increased. The binder resin which has an alicyclic hydrocarbon group can mention the polymer which copolymerized the ethylenically unsaturated monomer which has an alicyclic hydrocarbon group in the said carboxyl group-containing polymer, for example.

As an example of the ethylenically unsaturated monomer which has an alicyclic hydrocarbon group, N-cyclohexyl maleimide, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, and tricyclo [5.2 which were illustrated as the said unsaturated monomer (2) were mentioned. .1.0 ^2,6 ] decane-8-yl (meth) acrylate, dicyclopentenyl (meth) acrylate, cyclohexylvinylether, isobornylvinylether, tricyclo [5.2.1.0 ^2,6 ] decane- In addition to 8-ylvinyl ether and pentacyclopentadecanylvinyl ether, tricyclo [5.2.1.0 ^2,6 ] decane-8-yloxyethyl (meth) acrylate, adamantyl (meth) acrylate, dicyclophene Tenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, decahydro-2-naphthyl (meth) acrylate, pentacyclopentadedecanyl (meth) acrylate, tricyclopentenyl (meth) Acrylates and the like.

In the binder resin having an alicyclic hydrocarbon group, the copolymerization ratio of the ethylenically unsaturated monomer having an alicyclic hydrocarbon group is preferably 5 to 60 mass%, more preferably 10 to 40 mass% in terms of enhancing the desired effect.

The polystyrene reduced weight average molecular weight (hereinafter sometimes referred to as "Mw") measured by gel permeation chromatography (GPC, elution solvent: tetrahydrofuran) of the binder resin in the present invention is usually 1,000 to 300,000, preferably 3,000 to 100,000. If Mw is too small, the remaining film ratio or the like of the obtained pixel may be lowered, the pattern shape, heat resistance, or the like may be damaged or the electrical characteristics may be deteriorated. If the Mw is too large, the pattern shape may be damaged.

In addition, the ratio (Mw) of Mw of binder resin in this invention and the polystyrene conversion number average molecular weight (henceforth "Mn") measured by gel permeation chromatography (GPC, elution solvent: tetrahydrofuran) / Mn) is preferably 1.0 to 5.0, more preferably 1.0 to 3.0.

Binder resin in this invention can be manufactured by a well-known method, For example, it is disclosed by Unexamined-Japanese-Patent No. 2003-222717, 2006-259680, International Publication 07/029871, etc. The structure, Mw, and Mw / Mn can also be controlled by the method.

In this invention, binder resin can be used individually or in mixture of 2 or more types.

In the coloring composition for forming each color pixel which comprises the color filter of this invention, content of binder resin is 10-1,000 mass parts normally with respect to 100 mass parts of colorants, Preferably it is 20-500 mass parts. In this case, when there is too little content of binder resin, for example, there exists a possibility that the storage stability and alkali developability of the coloring composition obtained may fall, and when too much, since the coloring agent concentration will fall comparatively, the color aimed as a thin film There is a fear that it is difficult to achieve the concentration.

-Polyfunctional monomer-

The coloring composition for forming each color pixel which comprises the color filter of this invention can contain a polyfunctional monomer. Thereby, it becomes what has sclerosis | hardenability by exposure and / or heating.

The polyfunctional monomer is not particularly limited as long as it is a compound having two or more polymerizable groups. As a group which can superpose | polymerize, an ethylenically unsaturated group, an oxiranyl group, an oxetanyl group, an N-alkoxy methylamino group, etc. are mentioned, for example. In the present invention, as the multifunctional monomer, a compound having two or more (meth) acryloyl groups, or a compound having two or more N-alkoxymethylamino groups is preferable.

As a specific example of the said compound which has two or more (meth) acryloyl groups, the polyfunctional (meth) acrylate obtained by making an aliphatic polyhydroxy compound and (meth) acrylic acid react, and the polyfunctional (meth) acrylate modified with caprolactone , Polyfunctional urethane (meth) acrylate obtained by reacting alkylene oxide-modified polyfunctional (meth) acrylate, (meth) acrylate having hydroxyl group and polyfunctional isocyanate, (meth) acrylate having hydroxyl group and acid anhydride The polyfunctional (meth) acrylate which has a carboxyl group obtained by making it react, etc. are mentioned.

Here, as the aliphatic polyhydroxy compound, for example, divalent aliphatic polyhydroxy compounds such as ethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol, glycerin, trimethylolpropane, pentaerythritol, dipentaerythritol and The same trivalent or more aliphatic polyhydroxy compound is mentioned. As (meth) acrylate which has the said hydroxyl group, 2-hydroxyethyl (meth) acrylate, trimethylol propanedi (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol penta, for example (Meth) acrylate, glycerol dimethacrylate, etc. are mentioned. As said polyfunctional isocyanate, tolylene diisocyanate, hexamethylene diisocyanate, diphenylmethylene diisocyanate, isophorone diisocyanate, etc. are mentioned, for example. As the acid anhydride, for example, anhydrides of dibasic acids such as succinic anhydride, maleic anhydride, glutaric anhydride, itaconic anhydride, phthalic anhydride, hexahydro phthalic anhydride, pyromellitic anhydride, biphenyltetracarboxylic acid 2 Tetrabasic acid dianhydrides such as anhydride and benzophenone tetracarboxylic dianhydride.

Moreover, as said caprolactone modified polyfunctional (meth) acrylate, the compound described in Paragraph [0015]-[0018] of Unexamined-Japanese-Patent No. 11-44955 is mentioned, for example. Examples of the alkylene oxide-modified polyfunctional (meth) acrylates include ethylene oxide and / or propylene oxide-modified di (meth) acrylates of bisphenol A, ethylene oxide and / or propylene oxide-modified isocyanuric acid. Tri (meth) acrylate, ethylene oxide and / or propylene oxide modified tri (meth) acrylate of trimethylolpropane, ethylene oxide and / or propylene oxide modified tri (meth) acrylate, penta of pentaerythritol Ethylene oxide and / or propylene oxide modified tetra (meth) acrylate of erythritol, ethylene oxide and / or propylene oxide modified penta (meth) acrylate of dipentaerythritol, ethylene oxide of dipentaerythritol And / or propylene oxide modified hexa (meth) acrylates.

Moreover, as a compound which has the said 2 or more N-alkoxy methylamino group, the compound etc. which have a melamine structure, a benzoguanamine structure, a urea structure are mentioned, for example. In addition, a melamine structure and a benzoguanamine structure mean the chemical structure which has one or more triazine ring or a phenyl substituted triazine ring as a basic skeleton, and is a concept containing a melamine compound, a benzoguanamine compound, or its condensate. Specific examples of the compound having two or more N-alkoxymethylamino groups include N, N, N ', N', N '', N ''-hexa (alkoxymethyl) melamine, N, N, N ', N'- Tetra (alkoxymethyl) benzoguanamine, N, N, N ', N'-tetra (alkoxymethyl) glycoluril and the like.

Among these polyfunctional monomers, an ester of a trivalent or higher aliphatic polyhydroxy compound with (meth) acrylic acid, a caprolactone modified polyfunctional (meth) acrylate, a polyfunctional urethane (meth) acrylate, and a polyfunctional (meth) having a carboxyl group Acrylate, N, N, N ', N', N '', N ''-hexa (alkoxymethyl) melamine, N, N, N ', N'-tetra (alkoxymethyl) benzoguanamine are preferred. . In ester of a trivalent or more aliphatic polyhydroxy compound and (meth) acrylic acid, a trimethylol propane triacrylate, pentaerythritol triacrylate, dipentaerythritol pentaacrylate, and dipentaerythritol hexaacrylate are a carboxyl group. In the polyfunctional (meth) acrylate which has a compound, the compound obtained by making pentaerythritol triacrylate and succinic anhydride react, and the compound obtained by making dipentaerythritol pentaacrylate and succinic anhydride react, the intensity of a pixel is large, It is especially preferable at the point which the surface smoothness of a pixel is excellent.

In this invention, a polyfunctional monomer can be used individually or in mixture of 2 or more types.

In the coloring composition for forming each color pixel which comprises the color filter of this invention, 5-500 mass parts is preferable with respect to 100 mass parts of binder resin, and, as for content of a polyfunctional monomer, 50-300 mass parts is especially preferable. In this case, when there is too little content of a polyfunctional monomer, there exists a possibility that sufficient sclerosis | hardenability may not be obtained. On the other hand, when there is too much content of a polyfunctional monomer, there exists a tendency for alkali developability to fall, when alkali developability is provided to the coloring composition of this invention.

-Photoinitiator-

The radiation sensitive property can be provided to the coloring composition for forming each color pixel which comprises the color filter of this invention by containing a photoinitiator. The photopolymerization initiator is a compound capable of generating active species capable of initiating a curing reaction of the multifunctional monomer by exposure to radiation such as visible light, ultraviolet light, far ultraviolet rays, electron beams, and X-rays.

As such a photoinitiator, a thioxanthone type compound, an acetophenone type compound, a biimidazole type compound, a triazine type compound, O-acyl oxime type compound, an onium salt type compound, a benzoin type compound, a benzophenone type compound, (alpha)-diketone type compound, a polynuclear quinone type compound, a diazo type compound, an imide sulfonate type compound, etc. are mentioned.

In this invention, a photoinitiator can be used individually or in mixture of 2 or more types. As a photoinitiator, at least 1 sort (s) chosen from the group of a thioxanthone type compound, an acetophenone type compound, a biimidazole type compound, a triazine type compound, and O-acyl oxime type compound is preferable.

As a specific example of a thioxanthone type compound among the preferable photoinitiators in this invention, thioxanthone, 2-chloro thioxanthone, 2-methyl thioxanthone, 2-isopropyl thioxanthone, 4-isopropyl thioxide Santone, 2, 4- dichloro thioxanthone, 2, 4- dimethyl thioxanthone, 2, 4- diethyl thioxanthone, 2, 4- diisopropyl thioxanthone, etc. are mentioned.

In addition, specific examples of the acetophenone-based compound include 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane-1-one and 2-benzyl-2-dimethylamino-1- ( 4-morpholinophenyl) butan-1-one, 2- (4-methylbenzyl) -2- (dimethylamino) -1- (4-morpholinophenyl) butan-1-one, etc. are mentioned.

Moreover, as a specific example of the said biimidazole type compound, 2,2'-bis (2-chlorophenyl) -4,4 ', 5,5'- tetraphenyl- 1,2'-biimidazole, 2,2 '-Bis (2,4-dichlorophenyl) -4,4', 5,5'-tetraphenyl-1,2'-biimidazole, 2,2'-bis (2,4,6-trichlorophenyl ) -4,4 ', 5,5'-tetraphenyl-1,2'-biimidazole, etc. are mentioned.

Moreover, when using a biimidazole type compound as a photoinitiator, using a hydrogen donor together is preferable at the point which can improve a sensitivity. The term "hydrogen donor" as used herein means a compound capable of donating a hydrogen atom to a radical generated from a nonimidazole-based compound by exposure. Examples of the hydrogen donor include mercaptan-based hydrogen donors such as 2-mercaptobenzothiazole and 2-mercaptobenzoxazole, 4,4'-bis (dimethylamino) benzophenone, and 4,4'-bis (di Amine hydrogen donors, such as ethylamino) benzophenone, are mentioned. In the present invention, the hydrogen donors may be used alone or in combination of two or more thereof, and the combination of one or more mercaptan-based hydrogen donors and one or more amine-based hydrogen donors may further improve the sensitivity. Preferred at

In addition, specific examples of the triazine-based compound include 2,4,6-tris (trichloromethyl) -s-triazine, 2-methyl-4,6-bis (trichloromethyl) -s-triazine, 2- [2- (5-methylfuran-2-yl) ethenyl] -4,6-bis (trichloromethyl) -s-triazine, 2- [2- (furan-2-yl) ethenyl] -4 , 6-bis (trichloromethyl) -s-triazine, 2- [2- (4-diethylamino-2-methylphenyl) ethenyl] -4,6-bis (trichloromethyl) -s-triazine , 2- [2- (3,4-dimethoxyphenyl) ethenyl] -4,6-bis (trichloromethyl) -s-triazine, 2- (4-methoxyphenyl) -4,6-bis (Trichloromethyl) -s-triazine, 2- (4-ethoxystyryl) -4,6-bis (trichloromethyl) -s-triazine, 2- (4-n-butoxyphenyl)- Triazine type compounds which have halomethyl groups, such as 4, 6-bis (trichloromethyl) -s-triazine, are mentioned.

In addition, specific examples of the O-acyl oxime compound include 1,2-octanedione, 1- [4- (phenylthio) phenyl]-, 2- (O-benzoyloxime), ethanone, 1- [9-ethyl -6- (2-methylbenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- [9-ethyl-6- (2-methyl-4-tetra Hydrofuranylmethoxybenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxime), ethanone, 1- [9-ethyl-6- {2-methyl-4- (2,2 -Dimethyl-1,3-dioxolanyl) methoxybenzoyl} -9H-carbazol-3-yl]-, 1- (O-acetyloxime) and the like.

In this invention, when using photoinitiators other than biimidazole type compounds, such as an acetophenone type compound, a sensitizer can also be used together. As such a sensitizer, 4,4'-bis (dimethylamino) benzophenone, 4,4'-bis (diethylamino) benzophenone, 4-diethylamino acetophenone, 4-dimethylamino propiophenone, for example. Ethyl 4-dimethylaminobenzoate, 2-ethylhexyl 4-dimethylaminobenzoic acid, 2,5-bis (4-diethylaminobenzal) cyclohexanone, 7-diethylamino-3- (4-diethylaminobenzoyl ) Coumarin, 4- (diethylamino) chalcone, and the like.

In the coloring composition for forming each color pixel which comprises the color filter of this invention, content of a photoinitiator is 0.01-120 mass parts normally with respect to 100 mass parts of polyfunctional monomers, Preferably it is 1-100 mass parts. .

Solvent

The coloring composition for forming each color pixel which comprises the color filter of this invention is normally prepared as a liquid composition by mix | blending a solvent. As a solvent, as long as it has a suitable volatility, it does not react with these components, disperse | distributing or dissolving each component which comprises a coloring composition, and can be used suitably.

As such a solvent, for example, propylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, 3-methoxybutyl acetate, diethylene glycol dimethyl ether, diethylene glycol Methyl ethyl ether, cyclohexanone, 2-heptanone, 3-heptanone, 1,3-butylene glycol diacetate, 1,6-hexanediol diacetate, ethyl lactate, 3-methoxypropionate, 3-e Methyl oxypropionate, ethyl 3-ethoxypropionate, 3-methyl-3-methoxybutyl propionate, n-butyl acetate, i-butyl acetate, n-amyl acetate, i-amyl acetate, n-butyl propionate, butyric acid Ethyl, butyric acid i-propyl, n-butyl butyrate, ethyl pyruvate and the like.

These solvents may be used alone or in combination of two or more.

Although content of a solvent is not specifically limited, From the viewpoint of the applicability | paintability, stability, etc. of the coloring composition obtained, the quantity by which the total concentration of each component except the solvent from the said composition becomes 5-50 mass% is preferable, Especially it is 10-10. The amount which becomes 40 mass% is preferable.

-Other additives-

The coloring composition of this invention may contain other additive further as needed.

As said additive, For example, fillers, such as glass and an alumina; High molecular compounds such as polyvinyl alcohol and poly (fluoroalkyl acrylate); Surfactants such as nonionic surface active agents, cationic surface active agents, and anionic surface active agents; Vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4-epoxycyclo Hexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, etc. Adhesion promoter; Antioxidants such as 2,2-thiobis (4-methyl-6-t-butylphenol) and 2,6-di-t-butylphenol; Ultraviolet absorbers such as 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole and alkoxybenzophenones; An anti-aggregation agent such as sodium polyacrylate; Amino-1-pentanol, 3-amino-1,2-propane, 3-amino-1-pentanol, Diol, 2-amino-1,3-propanediol, 4-amino-1,2-butanediol and the like; Developability improvement agents, such as succinate mono [2- (meth) acryloyloxyethyl], phthalate mono [2- (meth) acryloyloxyethyl], and ω-carboxypolycaprolactone mono (meth) acrylate, etc. are mentioned. Can be.

In this invention, a coloring composition can be manufactured by a suitable method, and can be manufactured by mixing each said component. As a manufacturing method of a coloring composition, a coloring agent is mixed and disperse | distributed in the presence of a dispersing agent in a solvent with a part of binder resin, for example using a bead mill, a roll mill, etc., grind | pulverizing, and to make a coloring agent dispersion liquid then, The polyfunctional monomer, binder resin, etc., and the method of adding an additional solvent further as needed and mixing this colorant dispersion liquid are mentioned.

As the dispersant, for example, suitable dispersants such as cationic, anionic, and nonionic systems can be used, but a polymer dispersant is preferable. Specifically, an acryl-type copolymer, a polyurethane, polyester, polyethyleneimine, polyallylamine, etc. are mentioned.

Such dispersants are commercially available, for example, as an acrylic copolymer, Disperbyk-2000, Disperbyk-2001, BYK-LPN6919, BYK-LPN21116 (above, manufactured by BYK), polyurethane, and Disperbyk. -161, Disperbyk-162, Disperbyk-165, Disperbyk-167, Disperbyk-170, Disperbyk-182 (above, manufactured by BYK Corporation), Solsper 76500 (manufactured by Lubrizol Co., Ltd.), polyethyleneimine Examples of the solvent include Solsperpers 24000 (manufactured by Lubrizol Co., Ltd.) and polyester, and azisper PB821, azisper PB822, and azisper PB880 (manufactured by Ajinomoto Fine Techno Co., Ltd.).

These dispersants can be used individually or in mixture of 2 or more types. Content of a dispersing agent is 100 mass parts or less normally with respect to 100 mass parts of coloring agents, Preferably it is 1-70 mass parts, More preferably, it is 10-50 mass parts. When there is too much content of a dispersing agent, there exists a possibility that developability etc. may be impaired.

When disperse | distributing a coloring agent, a dispersal auxiliary agent can also be used with the said dispersing agent. Examples of the dispersion aid include pigment derivatives, and specific examples thereof include copper phthalocyanine, diketopyrrolopyrrole, and sulfonic acid derivatives of quinophthalone.

Next, the manufacturing method of the color filter of this invention is demonstrated.

As a method of manufacturing a color filter, the following method is mentioned first. First, a light shielding layer (black matrix) is formed on the surface of the substrate so as to partition a portion for forming a pixel as necessary. Subsequently, on this board | substrate, the coloring composition in which the red coloring agent containing (1) CI pigment red 242 and at least 1 sort (s) chosen from the group which consists of (2) CI pigment red 177 and CI pigment red 254 was disperse | distributed After apply | coating the liquid composition of, prebaking is performed and the solvent is evaporated and a coating film is formed. Subsequently, after exposing through a photomask to this coating film, it develops using alkaline developing solution, and removes and removes the unexposed part of a coating film. Thereafter, post-baking forms a pixel array in which red pixel patterns are arranged in a predetermined arrangement.

Subsequently, using the liquid composition of each coloring composition in which the green or blue coloring agent was disperse | distributed, apply | coating, prebaking, exposing, developing, and postbaking each liquid composition similarly to the above, and the green pixel array and the blue pixel Arrays are sequentially formed on the same substrate. Thereby, a color filter is obtained in which pixel arrays of three primary colors of red, green, and blue are arranged on a substrate. However, in the present invention, the order of forming the pixels of each color is not limited to the above.

The black matrix can be formed by forming a metal thin film such as chromium formed by sputtering or vapor deposition into a desired pattern using a photolithography method, and forming the pixel using a coloring composition in which a black colorant is dispersed. It may be formed in the same manner as in one case. The film thickness of the black matrix containing a metal thin film is 0.1-0.2 micrometer normally, while the film thickness of the resin black matrix formed using the black composition is about 1 micrometer.

As a board | substrate used when forming a pixel, glass, silicone, a polycarbonate, polyester, aromatic polyamide, polyamideimide, polyimide, etc. are mentioned, for example.

In addition, these substrates may be subjected to appropriate pretreatment such as chemical treatment with a silane coupling agent or the like, plasma treatment, ion plating, sputtering, vapor phase reaction, vacuum deposition, or the like as necessary.

When applying the liquid composition of a coloring composition to a board | substrate, the appropriate coating methods, such as a spray method, the roll coating method, the spin coating method (spin coating method), the slit die coating method, the bar coating method, can be employ | adopted, Especially spin coating The method and the slit die coating method are preferable.

Prebaking is normally performed combining pressure reduction drying and heat drying. Drying under reduced pressure is usually performed at 0.1 to 1 Torr. The conditions for heating and drying are usually about 70 to 110 DEG C for about 1 to 10 minutes.

Examples of the radiation used when forming the color filter include lamp light sources such as xenon lamps, halogen lamps, tungsten lamps, high pressure mercury lamps, ultrahigh pressure mercury lamps, metal halide lamps, medium pressure mercury lamps, low pressure mercury lamps, argon ion lasers, YAG lasers, Laser light sources, such as an XeCl excimer laser and a nitrogen laser, etc. are mentioned, The radiation whose wavelength is 190-450 nm is preferable.

The exposure dose of radiation is preferably 10 to 10,000 J / m ² .

As the alkaline developer, for example, sodium carbonate, sodium hydroxide, potassium hydroxide, tetramethylammonium hydroxide, choline, 1,8-diazabicyclo- [5.4.0] -7-undecene, 1,5-dia Aqueous solutions, such as xabicyclo- [4.3.0] -5-nonene, are preferable.

A suitable amount of water-soluble organic solvents, such as methanol and ethanol, surfactant, etc. can also be added to alkaline developing solution. After the alkali development, it is usually washed with water.

As the developing treatment method, a shower developing method, a spray developing method, a dip (immersion) developing method, a puddle (liquid buildup) developing method, and the like can be applied. The developing conditions are preferably 5 to 300 seconds at room temperature.

Post-baking conditions are about 20 to 40 minutes at 180-280 degreeC normally.

The film thickness of the pixel formed in this way is 0.5-5.0 micrometers normally, Preferably it is 1.0-3.0 micrometers.

Moreover, the method of obtaining the pixel of each color by the inkjet system is also known as a 2nd method of manufacturing a color filter. In this method, the partition which also serves as the light shielding function is first formed on the surface of the substrate. Subsequently, in the partition formed, the coloring composition in which the red coloring agent containing (1) CI pigment red 242 and at least 1 sort (s) chosen from the group which consists of (2) CI pigment red 177 and CI pigment red 254 is disperse | distributed After discharging the liquid composition by the inkjet apparatus, prebaking is performed to evaporate the solvent. Subsequently, after exposing this coating film as needed, it hardens | cures by post-baking and a red pixel pattern is formed.

Next, using the liquid composition of each coloring composition in which the green or blue coloring agent was disperse | distributed, the green pixel pattern and the blue pixel pattern are formed sequentially on the same board | substrate similarly to the above. Thereby, the color filter by which the pixel pattern of three primary colors of red, green, and blue is arrange | positioned on a board | substrate is obtained. However, in the present invention, the order of forming the pixels of each color is not limited to the above.

In addition, the partition wall has a function not only for blocking the light, but also for preventing coloring of the colored compositions discharged into the compartments from being mixed, so that the film thickness is thicker than that of the black matrix used in the first method. The film thickness is usually 1-3 micrometers. Therefore, a partition is normally formed using a black composition.

The method and conditions of the substrate, the light source of the radiation used for forming the color filter, the prebaking and the postbaking are the same as those of the first method described above. Thus, the film thickness of the pixel formed by the inkjet system is about the same as the film thickness of a partition.

After forming a protective film on the color filter obtained in this way as needed, a transparent conductive film is formed by sputtering. Moreover, a spacer is formed on a transparent conductive film as needed. Examples of the transparent conductive film include an NESA film containing tin oxide (registered trademark of US PPG Corporation), an ITO film containing indium oxide-tin oxide, an IZO film containing indium oxide-zinc oxide, and the like. Moreover, as a protective film, inorganic films, such as an organic film formed from a thermosetting resin composition, a SiNx film, and an SiOx film, are mentioned. In addition, the spacer is usually formed of a radiation sensitive composition.

Color liquid crystal display element

The color liquid crystal display element of this invention is equipped with the color filter of this invention, and the backlight unit which makes a white LED the light source in the back side.

The type of white LED used in the backlight unit is not particularly limited as long as it is an LED that generates white light. For example, a white LED, a red LED, and a green, which obtain white light using a red LED, a green LED, and a blue LED having independent spectra. White LED, which combines LEDs and blue LEDs to obtain white light by mixing, and white LED, blue LED, red LED, and green phosphor, which combine to combine white LED, blue LED, red light emitting phosphor and green light emitting phosphor. White LED to obtain white light by means of white LED, white LED to obtain white light by mixing of blue LED and YAG phosphor, white LED to obtain white light by mixing by combining blue LED, orange light emitting phosphor and green light emitting phosphor, ultraviolet LED and red light emitting White LEDs and the like which combine white phosphors with green luminescent phosphors and blue luminescent phosphors to obtain white light by color mixing. .

The color filter of the present invention has a light emission spectrum of a white LED having a maximum emission peak derived from a blue LED in a wavelength band of 430 nm to 470 nm, and a intensity less than the maximum emission peak in a wavelength band of 500 nm to 700 nm. Particularly suitable in the case of having a peak or two or more maximum emission peaks. As such a white LED, a white LED which combines a blue LED, a red light emitting phosphor, and a green light emitting phosphor to obtain white light by mixing, a white LED which obtains white light by mixing a blue LED and a YAG phosphor, and a blue LED and an orange light emitting phosphor and green White LED etc. which combine white light emitting phosphor and obtain white light by mixing are mentioned. Here, as an example of the emission spectrum of a white LED, an example of the emission spectrum of the white LED which combines a blue LED and a YAG fluorescent substance is shown in FIG. 1 of the white LED which combines a blue LED, a red luminescent fluorescent substance, and a green luminescent fluorescent substance. One example of the emission spectrum is shown in FIG. 2, respectively.

As a blue LED in a backlight unit, an indium gallium nitride system semiconductor element, a gallium nitride system semiconductor element, etc. are mentioned, for example. The YAG phosphor absorbs blue light generated in a blue LED and emits yellow light.

Examples of the red light-emitting phosphor that absorbs blue light and emits red light and the green light-emitting phosphor that absorbs blue light and emits green light include, for example, phosphors disclosed in International Publication No. 2006/104319. As the orange light emitting phosphor that absorbs blue light and emits orange light, for example, the phosphor disclosed in Japanese Patent Laid-Open No. 2008-24791 can be cited. In addition, the white LED disclosed in Unexamined-Japanese-Patent No. 2002-133910 is mentioned, for example about the white LED which combines an ultraviolet LED, a red luminescent phosphor, a green luminescent phosphor, and a blue luminescent phosphor to obtain white light by mixing. Can be.

The color liquid crystal display element of this invention can employ | adopt an appropriate structure. For example, the color filter may be formed on a substrate separate from the driving substrate on which the thin film transistor (TFT) is disposed, and the driving substrate and the substrate on which the color filter is formed may have a structure opposite to each other via the liquid crystal layer. have. As this representative example, the structure disclosed by the international publication 2007/102386 is mentioned, for example. In addition, the substrate in which the color filter is formed on the surface of the driving substrate on which the thin film transistor TFT is disposed, and the substrate in which the transparent electrode is formed, can face each other via the liquid crystal layer. This structure can remarkably improve the aperture ratio and has the advantage that a bright and high precision liquid crystal display element is obtained.

In the color liquid crystal display device of the present invention, TN (Twisted Nematic) type, STN (Super Twisted Nematic) type, IPS (In-Planes Switching) type, VA (Vertical Alignment) type, OCB (Optically Compensated Birefringence) type, etc. The liquid crystal mode can be applied.

Example

Hereinafter, an Example is given and this invention is demonstrated further more concretely. However, the present invention is not limited to the following examples.

Synthesis of Binder Resin

Synthesis Example 1

In a flask equipped with a cooling tube and a stirrer, 3 parts by mass of 2,2'-azobisisobutyronitrile and 235 parts by mass of propylene glycol monomethyl ether acetate were added, followed by 15 parts by mass of methacrylic acid and N-phenylmaleic 30 parts by mass of mead, 35 parts by mass of benzyl methacrylate, 20 parts by mass of styrene, and 5 parts by mass of α-methylstyrene dimer (chain transfer agent) were added thereto, and after nitrogen substitution, the reaction solution was heated to 80 ° C while stirring slowly. The polymerization was carried out for 3 hours while maintaining this temperature. Thereafter, the reaction solution was heated to 100 ° C, 0.5 parts by mass of 2,2'-azobisisobutyronitrile was added, and polymerization was continued for 1 hour to obtain a binder resin solution (solid content concentration = 30% by mass). . Obtained binder resin was Mw = 10,000 and Mn = 5,600. Let this binder resin solution be "binder resin solution (B-1)."

Synthesis Example 2

156 mass parts of propylene glycol monomethyl ether acetates were thrown into the flask provided with the cooling tube and the stirrer, and it heated at 80 degreeC, injecting nitrogen gas. At the same temperature, 15 parts by mass of methacrylic acid, 12 parts by mass of N-phenylmaleimide, 12.5 parts by mass of 2-methacryloyloxyethyl succinic acid, 10 parts by mass of styrene, and 12.5 parts by mass of 2-hydroxyethyl methacrylate , A solution obtained by dissolving 13 parts by mass of methyl methacrylate and 25 parts by mass of cyclohexyl methacrylate in 46 parts by mass of propylene glycol monomethyl ether acetate, and 6 parts by mass of 2,2'-azobisisobutyronitrile in propylene glycol monomethyl The solution dissolved in 28 mass parts of ether acetate was dripped over 2 hours simultaneously. Then, the binder solution (solid content concentration = 30 mass%) was obtained by raising the temperature of the reaction solution to 100 degreeC, hold | maintaining this temperature, and superposing | polymerizing. Obtained binder resin was Mw = 12,000 and Mn = 6,400. Let this binder resin be "binder resin (B-2)."

Preparation of Colorant Dispersion

Production Example 1

15 parts by mass of 45/55 (mass ratio) mixture of CI Pigment Red 254 and CI Pigment Red 242 as a coloring agent, 10 parts by mass of BYK-LPN21116 (by BYK Co., Ltd.) as a dispersant (solid content concentration = 40% by mass) , 13 parts by mass of a binder resin (B-1) solution as a binder resin and 62 parts by mass of propylene glycol monomethyl ether acetate as a solvent were mixed and dispersed with a bead mill for 12 hours to prepare a colorant dispersion (A-1). .

Preparation Examples 2 to 22

In Preparation Example 1, except that the kind and mixing ratio of the colorant and the kind of the binder resin were changed as shown in Table 1, in the same manner as in Production Example 1, the colorant dispersions (A-2) to (A-22) Was prepared.

In Tables 1-3, for example, "R254" means CI Pigment Red 254, "R242" means CI Pigment Red 242, "R177" means CI Pigment Red 177, and "Y139" means CI Pigment. "Specific Y" is yellow 139, and the specific yellow pigment containing the clathrate compound of the guest represented by the said general formula (II) is melamine and the said melamine and the host represented by the said general formula (I) is "G36" CI pigment green 36 means CI pigment green 58 as "G58", CI pigment blue 15: 6 as "B15: 6", and CI pigment violet 23 as "V23".

Reference Example 1

Sensitizing radiation property  Preparation of Coloring Composition

46.7 parts by mass of the colorant dispersion (A-1) as the colorant, 10.7 parts by mass of the binder resin (B-1) solution as the binder resin, and a mixture of dipentaerythritol hexaacrylate and dipentaerythritol pentaacrylate as the polyfunctional monomer. (Nippon Kayaku Co., Ltd. make, brand name KAYARAD DPHA) As a 5.1 mass part, photoinitiator, 2-benzyl-2- dimethylamino-1- (4-morpholinophenyl) butan-1-one (the Shiva specialty chemicals company make, a brand name) Irgacure 369) and 4.5 parts by mass of propylene glycol monomethyl ether as a solvent and 32.0 parts by mass of ethyl 3-ethoxypropionate were mixed to prepare a liquid composition (S-1).

The liquid composition (S-1) was evaluated according to the following procedure.

Fabrication of the board

A liquid composition (S-1) a, was applied using a spin coater on a soda glass substrate formed film is SiO ₂ for preventing the elution of sodium ions on the surface, is performed for 3 minutes pre-baked on a hot plate at 90 ℃ film Formed.

Subsequently, after cooling the board | substrate with a coating film to room temperature, using a high pressure mercury lamp, the radiation which contains each wavelength of 365 nm, 405 nm, and 436 nm in a coating film of 1,000 J / m <^2> was used without a photomask. The exposure amount was exposed. Thereafter, a developer containing a 0.04% by mass aqueous potassium hydroxide solution at 23 ° C was discharged at a developing pressure of 1 kgf / cm ² (nozzle diameter 1 mm) to perform a shower development, followed by ultrapure water. It wash | cleaned and further post-baked at 230 degreeC for 20 minutes, and the board | substrate for evaluation in which the red cured film was formed was produced.

Evaluation of Chromaticity Characteristics

About the obtained board | substrate, the transmission spectrum was measured using the color analyzer (MCPD2000 by Otsuka Denshi Co., Ltd.). From the obtained transmission spectrum and the emission spectrum of the white LED shown in FIG. 1, chromaticity coordinate values (x, y) and magnetic pole values (Y) in the CIE1931 color system were obtained. The evaluation results are shown in Table 2.

Contrast ratio  evaluation

The obtained substrate was sandwiched between two deflecting plates, and the deflecting plate on the front side was rotated while irradiating with a white LED showing the emission spectrum of FIG. 1, and the transmitted light intensity was measured by luminance meter BM5-AS ( The maximum value and the minimum value were measured. And the value which divided the maximum value by the minimum value was evaluated as contrast ratio. The evaluation results are shown in Table 2.

Reference Examples 2 to 12 and Comparative Reference Examples 1 to 2

In Reference Example 1, liquid compositions (S-2) to (S-14) were prepared in the same manner as Reference Example 1 except that the colorant dispersion and the binder resin shown in Table 2 were changed.

Subsequently, evaluation was performed about the board | substrate with each cured film similarly to Reference Example 1 except having used liquid compositions (S-2)-(S-14) instead of liquid composition (S-1), respectively. The evaluation results are shown in Table 2.

Reference Examples 13 to 34 and Comparative Reference Examples 3 to 6

In Reference Example 1, a liquid composition was prepared using the colorant dispersions and the binder resins shown in Table 3, and a cured film was formed on the substrate using these liquid compositions, in the same manner as in Reference Example 1 to each substrate. Evaluation was performed. In addition, in evaluation of chromaticity characteristic and contrast ratio, in Reference Examples 13-23 and Comparative Reference Examples 3-4, the white LED which shows the emission spectrum of FIG. 2 was used, Reference Examples 24-34, and Comparative Reference Examples 5-6 In the present invention, a white LED is used in which a blue LED, an orange light emitting phosphor, and a green light emitting phosphor are combined to generate white light by mixing. The evaluation results are shown in Table 3.

Example 1

Production of color filter

After apply | coating a liquid composition (S-1) on the glass substrate with a black matrix using a spin coater, it prebaked for 3 minutes on the 90 degreeC hotplate, and formed the coating film.

Subsequently, after cooling the board | substrate with a coating film to room temperature, using a high pressure mercury lamp, the radiation which contains each wavelength of 365 nm, 405 nm, and 436 nm in a coating film via a stripe-shaped photomask is 1,000 J / m <^2>. It exposed at the exposure amount of. Thereafter, a developer containing a 0.04% by mass aqueous potassium hydroxide solution at 23 ° C was discharged at a developing pressure of 1 kgf / cm ² (nozzle diameter 1 mm) to perform a shower development, followed by washing with ultrapure water. By post-baking at 230 degreeC for 20 minutes, the red stripe-shaped pixel pattern which shows chromaticity coordinate value (x, y) equivalent to the said reference example 1 was formed on the board | substrate.

Next, using the liquid composition (S-7), the green stripe-shaped pixel pattern which shows chromaticity coordinate value (x, y) equivalent to the said reference example 7 next to a red stripe-shaped pixel pattern by the same method is used. Formed.

Subsequently, using the liquid composition (S-11), a blue stripe pixel pattern showing chromaticity coordinate values (x, y) equivalent to that of Reference Example 11 was applied to the neighborhood of the green stripe pixel pattern by the same method. The color filter was produced by forming.

Evaluation of the color filter

When the obtained color filter irradiated the white LED which shows the emission spectrum of FIG. 1, chromaticity coordinate values (x, y) and stimulus value (Y) in the white display in the CIE1931 colorimeter were measured. The evaluation results are shown in Table 4.

Furthermore, the visibility in black display was evaluated. The evaluation results are shown in Table 4.

Examples 2 to 22 and Comparative Examples 1 to 6

In Example 1, each color filter was evaluated like Example 1 except having formed the red, green, and blue stripe pixel pattern using the liquid composition shown in Table 4, and producing a color filter. It was. In addition, in evaluation of chromaticity characteristic and visibility, Examples 2-8 and Comparative Examples 1-2 used the white LED which shows the emission spectrum of FIG. 1 similar to Example 1, and Examples 9-15 and Comparative Example 3 In Examples 4 to 4, white LEDs showing the emission spectrum of FIG. 2 are used. In Examples 16 to 22 and Comparative Examples 5 to 6, white LEDs are generated by mixing color by combining a blue LED, an orange light emitting phosphor, and a green light emitting phosphor. Was used. The evaluation results are shown in Table 4.

Claims (7)

It is a color filter used for the liquid crystal display element which has a color filter which has a red pixel, a green pixel, and a blue pixel, and the backlight light source arrange | positioned at the back side,
The red pixel comprises at least one selected from the group consisting of (1) CI Pigment Red 242, (2) CI Pigment Red 177 and CI Pigment Red 254,
The color filter, characterized in that the backlight light source is a white LED. The color filter of claim 1, wherein the green pixel contains C.I.Pigment Green 58. The color filter according to claim 2, wherein the green pixel further contains an inclusion compound comprising a host represented by the following formula (I) or a tautomer thereof and a guest represented by the following formula (II).

(In formula (II), R ^a to R ^c represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms which may be substituted independently.) The color filter according to any one of claims 1 to 3, wherein the blue pixel contains C.I.Pigment Blue 15: 6. The color filter according to claim 4, wherein the blue pixel further contains a binder resin having an alicyclic hydrocarbon group. 6. The LED according to any one of claims 1 to 5, wherein the white LED has a maximum emission peak derived from a blue LED, and one or two or more maximums whose intensity is weaker than the maximum emission peak in a wavelength band of 500 to 700 nm. The color filter which shows the emission spectrum which has an emission peak. The color liquid crystal display element provided with the color filter in any one of Claims 1-6, and the white LED as a backlight light source in the back side.

Images