JP2006268039A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display in which vividness of displayed colors is improved. <P>SOLUTION: A liquid crystal display includes a backlight, a polarization plate, at least two substrates, a liquid crystal layer placed between the substrates, and a color filter layer formed on at least a part of the substrates, wherein the color filter layer has green pixels that satisfy the relations 0.25<x<0.32 and y>0.58, wherein x and y each represent a chromaticity value in an xy color system using illuminant C, the color filter layer has a contrast of 1000 or more with respect to each of X, Y and Z values, and the backlight uses a light-emitting device having a peak wavelength in the range of from 520 to 540 nm as a light source. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device with improved display color vividness.

Liquid crystal display devices have begun to be introduced into small devices such as calculators, and have expanded the range of applications to mobile devices, personal computers, monitors, and televisions.
For this reason, measures have been taken to increase the amount of colorants such as pigments contained in the color filter to widen the color reproduction range and to compensate for the decrease in luminance by means of backlights and optical members.
Furthermore, a measure for optimizing the wavelength of the backlight has been taken, and as an example, it has been reported that the color reproduction region is expanded in an example in which the light source is an LED (the green emission peak wavelength is shifted by a short wave) (for example, , See Patent Document 1).
As described above, the improvement in vividness has been promoted mainly by expanding the color reproduction range of the color filter and optimizing the wavelength of the backlight.
However, in recent years, the screen of a display device has become larger, and a display with higher display quality has been required. In particular, the vividness of the display color is an item that greatly affects the display quality of an image, and improvement is desired. It was.
JP 2004-78102 A

  The subject of this invention is providing the liquid crystal display device which improved the vividness of the display color.

The inventor of the present invention paid attention to black density increase, which is a vividness improving means performed by a method of recognizing an image by reflection of external light typified by silver salt photography. In these reflection methods, since the brightness of the image itself cannot be made higher than that of the external light, the fact that the black portion that is the background of the image is made blacker is used to make it feel visually vivid. However, since the liquid crystal display device is a self-luminous type having a light source inside, the luminance of the image is sufficiently high, and the effect of increasing the black density is unknown.
In actual trials, it was found that, even in a liquid crystal display device, an increase in black density improved vividness, and the effect was higher as the screen size was larger.
When the contrast of the color filter is low, the light leaks during black display and becomes slightly white. In this state, it was confirmed that the color was not visually recognized by an actual observer simply by expanding the color reproduction region by improving the backlight. Therefore, the present inventor has reached the conclusion that it is essential to increase the contrast of the color filter at the same time that the color reproduction region is enlarged to obtain sufficient vividness.
That is, the present invention is achieved by the following means.

<1> A liquid crystal display device comprising a backlight, a polarizing plate, at least two substrates, a liquid crystal layer sandwiched between the substrates, and a color filter layer provided on at least a part of the substrate. The color filter layer has a green pixel that satisfies 0.25 <x <0.32, y> 0.58 when the chromaticity is expressed in the x, y color system using a C light source. In addition, the contrast of the X value, Y value, and Z value of the color filter layer is 1000 or more, and a light emitting device having a peak wavelength between 520 and 540 nm is used as the light source for the backlight. Display device.

<2> A red pixel that satisfies 0.60 <x and 0.30 <y <0.36 when the color filter layer uses a C light source to express chromaticity in an x, y color system. And a blue pixel satisfying 0.12 <x <0.15 and 0.08 <y <0.11.

<3> The liquid crystal display device according to <1> or <2>, wherein the contrast is 2000 or more.

<4> The liquid crystal display device according to any one of <1> to <3>, wherein the contrast is 3000 or more.

<5> The liquid crystal display device according to any one of <1> to <4>, wherein the light emitting device is a light emitting diode.

<6> The liquid crystal display device according to any one of <1> to <5>, wherein the polarizing plate has a degree of polarization of 99.9 or more.

<7> The liquid crystal display device according to any one of <1> to <6>, wherein a screen size of the liquid crystal display device is 10 inches or more.

  ADVANTAGE OF THE INVENTION According to this invention, the liquid crystal display device which the color purity and the vividness of the display color improved can be provided.

A liquid crystal display device of the present invention includes a backlight, a polarizing plate, at least two substrates, a liquid crystal layer sandwiched between the substrates, and a color filter layer provided on at least part of the substrate. In the display device, when the color filter layer uses a C light source to express chromaticity in an x, y color system (CIE 1931 XYZ color system), 0.25 <x <0.32, y Light emission having a green pixel satisfying> 0.58, the color filter layer having a contrast of X value, Y value, and Z value of 1000 or more, and having a peak wavelength between 520 and 540 nm in the backlight It is characterized by using the device as a light source.
With this configuration, a liquid crystal display device with improved display color vividness can be obtained.

[Liquid Crystal Display]
The liquid crystal display device of the present invention includes a backlight, a polarizing plate, at least two substrates, a liquid crystal layer sandwiched between the substrates, and a color filter layer provided on at least part of the substrate.
Hereinafter, the liquid crystal display device of the present invention will be described in detail.
A typical configuration is such that an alignment film faces between a first substrate having an active element such as a TFT element, a pixel electrode, and an alignment film on a transparent substrate, and a second substrate having a color filter, a counter electrode, and an alignment film. The liquid crystal is filled in and sealed with a sealant. The distance between the substrates is maintained by a spacer. Polarizing plates are disposed on both sides of the substrate, and a backlight is disposed on the first substrate side. The configuration of the liquid crystal display element device of the present invention is not limited to the above configuration.

(Backlight)
In the present invention, a light emitting device having a peak wavelength between 520 and 540 nm is used as a backlight.
More specifically, a light emitting diode is preferably used as the light emitting device. A backlight using this light emitting diode is described in detail in JP-A-2004-78102, [0017] to [0036].
That is, a red (R) LED, a green (G) LED, and a blue (B) LED are included, the red (R) LED has a peak wavelength of 610 nm or more, and the green (G) LED has a peak wavelength of 530 ±. A backlight that is in the range of 10 nm and the peak wavelength of the blue (B) LED is 480 nm or less is preferably used. In particular, when the peak wavelength of the green (G) LED is in the range of 520 to 540, the green reproduction region of the liquid crystal display device of the present invention can be widened. In the present invention, the peak wavelength of the green (G) LED needs to be in the range of 520 to 540 nm, but preferably in the range of 525 to 535 nm. As a result, the NTSC ratio of the color gamut can be increased as compared with the conventional cold cathode tube.

  Examples of the green (G) LED having a peak wavelength within the above range include DG1112H (manufactured by Stanley Electric Co., Ltd.), UG1112H (manufactured by Stanley Electric Co., Ltd.), and E1L51-3G (manufactured by Toyoda Gosei Co., Ltd.). ), E1L49-3G (manufactured by Toyoda Gosei Co., Ltd.), NSPG500S (manufactured by Nichia Corporation), and the like.

A red (R) LED is also preferably used as the light source of the backlight of the present invention. In this case, although not particularly limited, the peak wavelength of the red (R) LED is preferably 610 nm or more, and more preferably in the range of 615 nm to 640 nm. Thus, the red NTSC standard chromaticity point can be reproduced in the liquid crystal display device of the present invention.
As specific examples of the red (R) LED, for example, FR1112H (manufactured by Stanley Electric Co., Ltd.), FR5366X (manufactured by Stanley Electric Co., Ltd.), NSTM515AS (R) (manufactured by Nichia Corporation), GL3ZR2D1COS ( Sharp Corporation), GM1JJ35200AE (Sharp Corporation), and the like.

As the light source of the backlight of the present invention, a blue (B) LED is also preferably used. In this case, the LED is not particularly limited as long as the LED has a peak wavelength of 480 nm or less. The peak wavelength of the blue (R) LED is preferably 480 nm or less, more preferably in the range of 465 nm to 475 nm. Thereby, the blue NTSC standard chromaticity point can be reproduced in the liquid crystal display device of the present invention.
Specific examples of the blue (B) LED include DB1112H (manufactured by Stanley Electric Co., Ltd.), DB5306X (manufactured by Stanley Electric Co., Ltd.), E1L51-3B (manufactured by Toyoda Gosei Co., Ltd.), E1L4E-SB1A (Toyoda Gosei). NSPB630S (manufactured by Nichia Corporation), NSPB310A (manufactured by Nichia Corporation), and the like.

  The peak wavelength in the present invention is obtained from a spectrum measurement value using a spectrophotometer MCPD-2000 manufactured by Otsuka Electronics.

(Color filter layer)
The color filter layer of the present invention is provided on at least a part of at least two substrates of the present invention, and includes a plurality of red (R) pixels, a plurality of green (G) pixels, and a plurality of blue (B) pixels. It is a layer that contains.
The green (G) pixel in the color filter layer satisfies 0.25 <x <0.32, y> 0.58 when the chromaticity is expressed in the x, y color system using the C light source. And preferably 0.26 <x <0.31, y> 0.59, and most preferably 0.27 <x <0.30, y> 0.595. These chromaticities are set according to the type and amount of a colorant to be described later.

Further, in the present invention, the contrast of the X value, Y value, and Z value of the color filter layer needs to be 1000 or more, preferably 1200 or more, more preferably 1500 or more, further preferably 2000 or more, and most preferably. 3000 or more.
Here, contrast is defined as the ratio of the amount of light passing through when the polarizing plate is placed in parallel to the amount of light passing through when crossed Nicols when a color filter is installed between the two polarizing plates.
The contrast is measured using a three-wavelength cold-cathode tube light source (FWL18EX-N, manufactured by Toshiba Lighting & Technology Corp.) as a backlight, and between two polarizing plates (G1220DUN, manufactured by Nitto Denko Corporation). Divide the X value of the chromaticity of the light that passes when the polarizing filter is installed in parallel (parallel Nicols) by the X value of the chromaticity of the light that passes when installed in crossed Nicols Thus, the contrast of the X value was obtained. The Y value and Z value of chromaticity were also measured in the same manner, and the contrast of the Y value and Z value was obtained. A color luminance meter (BM-5 manufactured by Topcon) was used for the measurement of chromaticity.
Two polarizing plates, a color filter, and a color luminance meter were installed at a position 13 mm from the backlight, a polarizing plate at a position 40 mm to 60 mm, and a cylinder 11 mm in diameter and 20 mm in length. Light was irradiated to a measurement sample installed at a position of 65 mm, and the transmitted light was measured with a color luminance meter installed at a position of 400 mm through a polarizing plate installed at a position of 100 mm. The measurement angle of the color luminance meter was set to 2 °. The light amount of the backlight was set so that the luminance when the two polarizing plates were installed in parallel Nicol was 1280 cd / m ² without the sample being installed.
This high-contrast color filter layer is achieved by increasing the dispersibility of the colorant to be used and making the particle size small, the details of which will be described later.

When the red (R) pixel in the color filter layer expresses chromaticity in the x, y color system using a C light source, 0.60 <x and 0.30 <y <0.36. It is preferable that 0.62 <x and 0.31 <y <0.35, and it is most preferable that 0.63 <x and 0.32 <y <0.34.
These chromaticities are set according to the type and amount of a colorant to be described later.

The color filter layer of the present invention has 0.12 <x <0.15, 0.08 <when a blue (B) pixel uses a C light source to express chromaticity in an x, y color system. It is preferable that y <0.11, more preferably 0.12 <x <0.14, 0.09 <y <0.11, and 0.13 <x <0.14, 0.09. Most preferably, <y <0.11.
These chromaticities are set according to the type and amount of a colorant to be described later.

By setting the color filter layer in the present invention within the above chromaticity range, a wide color gamut equivalent to NTSC can be obtained in combination with a backlight.
Further, by setting the color filter layer in the present invention within the above contrast range, black can be displayed more black, and the vividness of the liquid crystal display device of the present invention can be improved.

(Polarizer)
The degree of polarization of the polarizing plate in the present invention is not particularly limited, but is preferably 99.9 or more, more preferably 99.95 or more, and most preferably 99.99 or more. . By setting the degree of polarization to 99.9 or more, the occurrence of light leakage due to the polarizing plate is prevented, and the display density of black is preferably increased.

The degree of polarization is defined as follows:
Polarization degree = (((Tp−Tc) / (Tp + Tc)) ^ 0.5) × 100
Tp: Transmittance in the case where the absorption axes of the polarizing plates coincide with each other Tc: Transmittance in the case where the absorption axes of the polarizing plates overlap with each other The polarization degree is based on JIS K 7105, and the total light transmittance is Measured and calculated by the above formula.

The polarizing plate in the present invention is produced, for example, by dyeing / adsorbing iodine or a dye on polyvinyl alcohol, and stretching / orienting. As a result, a function as a polarizing plate that allows passage of only polarized light in a certain vibration direction is exhibited.
Specific examples include iodine-based HLC2-5618 (polarization degree 99.9979), HLC2-2518 (polarization degree 99.991), UHLC2-5618 (polarization degree 99.975), LLC2-9118 manufactured by Sanritsu Co., Ltd. (Polarization degree 99.982), LLC2-9218 (polarization degree 99.974), LLC2-81-18 (polarization degree 99.985), and dye systems such as HC2-6018 (polarization degree 99.952) manufactured by Sanritsu Co., Ltd. And the like are preferable examples.
Among these, iodine is preferable from the viewpoint of maintaining contrast over a long period of time, and the color of the polarizing plate is more preferably gray in terms of color balance (for example, HLC2-5618 (gray) of Sanritsu Co., Ltd., HLC2). -2518 (gray), UHLC2-5618 (gray), LLC2-9118 (gray), LLC2-9218 (gray), LLC2-81-18 (gray)), and the black color balance deviation that occurs at high contrast. From the viewpoint of suppression, the one having an orthogonal transmittance at 400 nm of 0.02% or less (for example, HLC2-2518 (0.01%) by Sanritsu Co., Ltd.) is most preferable.

(substrate)
As the substrate in the present invention, at least two substrates are required, but these are preferably transparent substrates. Examples of the transparent substrate include a soda glass plate having a silicon oxide film on the surface, a known glass plate such as a low expansion glass, a non-alkali glass, and a quartz glass plate, or a plastic film.
Moreover, the said board | substrate can make favorable adhesion | attachment with a coloring photosensitive resin composition or resin transfer material by giving a coupling process etc. previously. As the coupling treatment, a method described in JP 2000-39033 A is preferably used. Although not particularly limited, the thickness of the substrate is generally preferably 200 to 1200 μm.

(Liquid crystal layer)
In the present invention, the liquid crystal layer includes ECB (Electrically Controlled Birefringence), TN (Twisted Nematic), IPS (In-Plane Switching), FLC (Ferroelectric Liquid Crystal), OCB (Olyptic Liquid Crystal). (Vertical Aligned), HAN (Hybrid Aligned Nematic), GH (Guest Host), PVA (Patterned Vertical Alignment), MVA (Multi-domain Vertical Alignment) Can be used. Among these, a liquid crystal layer used in a liquid crystal mode such as TN, MVA, IPS, PVA, OCB is preferable. More preferably, the video display property is high, the viewing angle dependency is small, the MVA, IPS (super IPS), PVA, OCB modes are good, the black PVA mode with high contrast, and the countermeasures against light leakage near the alignment control protrusion Most preferably, the applied MVA and IPS with enhanced contrast (Super IPS) are used.

(electrode)
The electrode in the present invention refers to an electrode that applies an electric field to liquid crystal molecules in a liquid crystal layer. In the case of a liquid crystal mode such as TN, MVA, PVA, and OCB, it is formed on the liquid crystal side of the two substrates that sandwich the liquid crystal layer. In the IPS mode, it is provided on at least one side of two substrates sandwiching the liquid crystal. Indium oxide (ITO) or the like is used as the material.

(Screen size)
The effect of the present invention tends to be more prominent as the screen size of the liquid crystal display device is larger. Therefore, the liquid crystal display device of the present invention preferably has a screen size of 10 inches or more, more preferably 15 inches or more, and most preferably 20 inches or more. Here, the screen size of the liquid crystal display device of the present invention refers to the length of the diagonal line of the effective display area.

<Colored photosensitive resin composition>
The color filter layer in the present invention may be formed by any method as long as it has the characteristics of the color filter layer. Especially, it is preferable to form with a coloring photosensitive resin composition.
The colored photosensitive resin composition contains at least (1) an alkali-soluble resin, (2) a monomer or oligomer, (3) a photopolymerization initiator or photopolymerization initiator system, and (4) a colorant. .

(1) Alkali-soluble resin As the alkali-soluble resin (hereinafter sometimes simply referred to as “binder”) in the present invention, a polymer having a polar group such as a carboxylic acid group or a carboxylic acid group in the side chain is preferable. Examples thereof include JP-A-59-44615, JP-B-54-34327, JP-B-58-12577, JP-B-54-25957, JP-A-59-53836, and JP-A-57-36. A methacrylic acid copolymer, an acrylic acid copolymer, an itaconic acid copolymer, a crotonic acid copolymer, a maleic acid copolymer, a partially esterified maleic acid copolymer as described in JP-A-59-71048 Etc. Moreover, the cellulose derivative which has a carboxylic acid group in a side chain can also be mentioned, In addition to this, what added the cyclic acid anhydride to the polymer which has a hydroxyl group can also be used preferably. Further, as particularly preferred examples, copolymers of benzyl (meth) acrylate and (meth) acrylic acid described in US Pat. No. 4,139,391, benzyl (meth) acrylate, (meth) acrylic acid and other monomers And a multi-component copolymer. These binder polymers having a polar group may be used alone or in the form of a composition used in combination with a normal film-forming polymer, based on the total solid content of the colored photosensitive resin composition. The content is generally 20 to 50% by mass, and preferably 25 to 45% by mass.

(2) Monomer or Oligomer The monomer or oligomer in the present invention is preferably a monomer or oligomer that has two or more ethylenically unsaturated double bonds and undergoes addition polymerization upon irradiation with light. Examples of such monomers and oligomers include compounds having at least one addition-polymerizable ethylenically unsaturated group in the molecule and having a boiling point of 100 ° C. or higher at normal pressure. Examples include monofunctional acrylates and monofunctional methacrylates such as polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate and phenoxyethyl (meth) acrylate; polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) ) Acrylate, trimethylolethane triacrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane diacrylate, neopentyl glycol di (meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, di Pentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth) acrylate, hexane All di (meth) acrylate, trimethylolpropane tri (acryloyloxypropyl) ether, tri (acryloyloxyethyl) isocyanurate, tri (acryloyloxyethyl) cyanurate, glycerin tri (meth) acrylate; multifunctional such as trimethylolpropane and glycerin Polyfunctional acrylates and polyfunctional methacrylates such as those obtained by adding ethylene oxide or propylene oxide to alcohol and then (meth) acrylated can be mentioned.

Further, urethane acrylates described in JP-B-48-41708, JP-B-50-6034 and JP-A-51-37193; JP-A-48-64183, JP-B-49-43191 And polyester acrylates described in JP-B-52-30490; polyfunctional acrylates such as epoxy acrylates which are reaction products of epoxy resin and (meth) acrylic acid, and methacrylates.
Among these, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and dipentaerythritol penta (meth) acrylate are preferable.
In addition, “polymerizable compound B” described in JP-A-11-133600 can also be mentioned as a preferable example.
These monomers or oligomers may be used alone or in combination of two or more, and the content of the colored photosensitive resin composition with respect to the total solid content is generally 5 to 50% by mass, and 10 to 40 Mass% is preferred.

(3) Photopolymerization initiator or photopolymerization initiator system As the photopolymerization initiator or photopolymerization initiator system in the present invention, a vicinal polyketaldonyl compound disclosed in US Pat. No. 2,367,660, US The acyloin ether compound described in Japanese Patent No. 2448828, the aromatic acyloin compound substituted with α-hydrocarbon described in US Pat. No. 2,722,512, US Pat. Nos. 3,046,127 and 2,951,758 No. 3,549,367, a combination of a triarylimidazole dimer and a p-aminoketone, a benzothiazole compound described in Japanese Patent Publication No. 51-48516, and a trihalomethyl- s-triazine compounds, described in US Pat. No. 4,239,850 Trihalomethyl - triazine compound include a trihalomethyl oxadiazole compounds described in U.S. Pat. No. 4,212,976. In particular, trihalomethyl-s-triazine, trihalomethyloxadiazole, and triarylimidazole dimer are preferable.
In addition, “polymerization initiator C” described in JP-A-11-133600 can also be mentioned as a preferable example.
These photopolymerization initiators or photopolymerization initiator systems may be used singly or as a mixture of two or more, but it is particularly preferable to use two or more. When at least two kinds of photopolymerization initiators are used, display characteristics, particularly display unevenness, can be reduced.
The content of the photopolymerization initiator or the photopolymerization initiator system with respect to the total solid content of the colored photosensitive resin composition is generally 0.5 to 20% by mass, and preferably 1 to 15% by mass.

(4) Colorant As a colorant in the present invention, (i) in the colored photosensitive resin composition of R (red), C.I. I. Pigment Red (C.I. Pigment Red) 254 is C.I. (ii) in the colored photosensitive resin composition of G (Green). I. Pigment Green (CI Pigment Green) 36 is C.I in the colored photosensitive resin composition (iii) B (Blue). I. CI Pigment Blue (C.I. Pigment Blue) 15: 6 is a preferable example.
The content of the red colorant (for example, CI Pigment Red 254) in the above (i) is a dry film in which the colored photosensitive resin composition is applied in a film thickness of 1.0 to 3.0 μm. is preferably 0.80~0.96g / m ^2, more preferably from 0.82~0.94g / m ^2, and particularly preferably 0.84~0.92g / m ^2.
The content of the green colorant (for example, CI Pigment Green 36) in the above (ii) is set in a dry film in which the colored photosensitive resin composition is applied in a film thickness of 1.0 to 3.0 μm. is preferably 0.90~1.34g / m ^2, more preferably from 0.95~1.29g / m ^2, and particularly preferably 1.01~1.23g / m ² .
The content of the blue colorant (for example, CI Pigment Blue 15: 6) in (iii) above is determined by the dry film coating applied with the colored photosensitive resin composition at a film thickness of 1.0 to 3.0 μm. There are is preferably 0.59~0.67g / m ^2, more preferably from 0.60~0.66g / m ^2, in particular to be 0.61~0.65g / m ² preferable.

  Further, in addition to the pigment, a pigment other than the pigment may be used in combination. Specific examples include dyes with the color index (CI) numbers described in the following auxiliary dyes and pigments.

-Supplementary dyes and pigments-
In the colored photosensitive resin composition in the present invention, a known colorant (dye or pigment) can be added in addition to the colorant (pigment) as necessary. In the case of using a pigment among the known colorants, it is desirable that the pigment is uniformly dispersed in the colored photosensitive resin composition, so that the particle size is 0.1 μm or less, particularly 0.08 μm or less. Is preferred.
When a colorant is used in combination, the total content of the colorant and the known colorant is preferably in the range of the content of the colorant.
Examples of the known dyes or pigments include Victoria Pure Blue BO (C.I. 42595), Auramine (C.I. 41000), Fat Black HB (C.I. 26150), C.I. I. Pigment yellow 1, C.I. I. Pigment yellow 3, C.I. I. Pigment yellow 12, C.I. I. Pigment yellow 13, C.I. I. Pigment yellow 14, C.I. I. Pigment yellow 5, C.I. I. Pigment yellow 16, C.I. I. Pigment yellow 17, C.I. I. Pigment yellow 20, C.I. I. Pigment yellow 24, C.I. I. Pigment yellow 31, C.I. I. Pigment yellow 55, C.I. I. Pigment yellow 60, C.I. I. Pigment yellow 61, C.I. I. Pigment yellow 65, C.I. I. Pigment yellow 71, C.I. I. Pigment yellow 73, C.I. I. Pigment yellow 74, C.I. I. Pigment yellow 81, C.I. I. Pigment yellow 83, C.I. I. Pigment yellow 93, C.I. I. Pigment yellow 95, C.I. I. Pigment yellow 97, C.I. I. Pigment yellow 98, C.I. I. Pigment yellow 100, C.I. I. Pigment yellow 101, C.I. I. Pigment yellow 104, C.I. I. Pigment yellow 106, C.I. I. Pigment yellow 108, C.I. I. Pigment yellow 109, C.I. I. Pigment yellow 110, C.I. I. Pigment yellow 113, C.I. I. Pigment yellow 114, C.I. I. Pigment yellow 116, C.I. I. Pigment yellow 117, C.I. I. Pigment yellow 119, C.I. I. Pigment yellow 120, C.I. I. Pigment yellow 126, C.I. I. Pigment yellow 127, C.I. I. Pigment yellow 128, C.I. I. Pigment yellow 129, C.I. I. Pigment yellow 138, C.I. I. Pigment yellow 139, C.I. I. Pigment yellow 150, C.I. I. Pigment yellow 151, C.I. I. Pigment yellow 152, C.I. I. Pigment yellow 153, C.I. I. Pigment yellow 154, C.I. I. Pigment yellow 155, C.I. I. Pigment yellow 156, C.I. I. Pigment yellow 166, C.I. I. Pigment yellow 168, C.I. I. Pigment yellow 175, C.I. I. Pigment yellow 180, C.I. I. Pigment yellow 185;

C. I. Pigment orange 1, C.I. I. Pigment orange 5, C.I. I. Pigment orange 13, C.I. I. Pigment orange 14, C.I. I. Pigment orange 16, C.I. I. Pigment orange 17, C.I. I. Pigment orange 24, C.I. I. Pigment orange 34, C.I. I. Pigment orange 36, C.I. I. Pigment orange 38, C.I. I. Pigment orange 40, C.I. I. Pigment orange 43, C.I. I. Pigment orange 46, C.I. I. Pigment orange 49, C.I. I. Pigment orange 51, C.I. I. Pigment orange 61, C.I. I. Pigment orange 63, C.I. I. Pigment orange 64, C.I. I. Pigment orange 71, C.I. I. Pigment orange 73; C.I. I. Pigment violet 1, C.I. I. Pigment violet 19, C.I. I. Pigment violet 23, C.I. I. Pigment violet 29, C.I. I. Pigment violet 32, C.I. I. Pigment violet 36, C.I. I. Pigment violet 38;

  C. I. Pigment red 1, C.I. I. Pigment red 2, C.I. I. Pigment red 3, C.I. I. Pigment red 4, C.I. I. Pigment red 5, C.I. I. Pigment red 6, C.I. I. Pigment red 7, C.I. I. Pigment Red. 8, C.I. I. Pigment red 9, C.I. I. Pigment Leck 10, C.I. I. Pigment red 11, C.I. I. Pigment red 12, C.I. I. Pigment red 14, C.I. I. Pigment red 15, C.I. I. Pigment red 16, C.I. I. Pigment red 17, C.I. I. Pigment red 18, C.I. I. Pigment red 19, C.I. I. Pigment red 21, C.I. I. Pigment red 22, C.I. I. Pigment red 23, C.I. I. Pigment red 30, C.I. I. Pigment red 31, C.I. I. Pigment red 32, C.I. I. Pigment red 37, C.I. I. Pigment red 38, C.I. I. Pigment red 40, C.I. I. Pigment red 41, C.I. I. Pigment red 42, C.I. I. Pigment red 48: 1, C.I. I. Pigment red 48: 2, C.I. I. Pigment red 48: 3, C.I. I. Pigment red 48: 4, C.I. I. Pigment red 49: 1, C.I. I. Pigment red 49: 2, C.I. I. Pigment red 50: 1, C.I. I. Pigment red 52: 1, C.I. I. Pigment red 53: 1, C.I. I. Pigment red 57, C.I. I. Pigment red 57: 1, C.I. I. Pigment red 57: 2, C.I. I. Pigment red 58: 2, C.I. I. Pigment red 58: 4, C.I. I. Pigment red 60: 1, C.I. I. Pigment red 63: 1, C.I. I. Pigment red 63: 2, C.I. I. Pigment red 64: 1, C.I. I. Pigment red 81: 1, C.I. I. Pigment red 83, C.I. I. Pigment red 88, C.I. I. Pigment red 90: 1, C.I. I. Pigment red 97, C.I. I. Pigment red 101, C.I. I. Pigment red 102, C.I. I. Pigment red 104, C.I. I. Pigment red 105, C.I. I. Pigment red 106, C.I. I. Pigment red 108, C.I. I. Pigment red 112, C.I. I. Pigment red 113, C.I. I. Pigment red 114, C.I. I. Pigment red 122, C.I. I. Pigment red 123, C.I. I. Pigment red 144, C.I. I. Pigment red 146, C.I. I. Pigment red 149, C.I. I. Pigment red 150, C.I. I. Pigment red 151, C.I. I. Pigment red 166, C.I. I. Pigment red 168, C.I. I. Pigment red 170, C.I. I. Pigment red 171, C.I. I. Pigment red 172, C.I. I. Pigment red 174, C.I. I. Pigment red 175, C.I. I. Pigment red 176, C.I. I. Pigment red 177, C.I. I. Pigment red 178, C.I. I. Pigment red 179, C.I. I. Pigment red 180, C.I. I. Pigment red 185, C.I. I. Pigment red 187, C.I. I. Pigment red 188, C.I. I. Pigment red 190, C.I. I. Pigment red 193, C.I. I. Pigment red 194, C.I. I. Pigment red 202, C.I. I. Pigment red 206, C.I. I. Pigment red 207, C.I. I. Pigment red 208, C.I. I. Pigment red 209, C.I. I. Pigment red 215, C.I. I. Pigment red 216, C.I. I. Pigment red 220, C.I. I. Pigment red 224, C.I. I. Pigment red 226, C.I. I. Pigment red 242, C.I. I. Pigment red 243, C.I. I. Pigment red 245, C.I. I. Pigment red 254, C.I. I. Pigment red 255, C.I. I. Pigment red 264, C.I. I. Pigment red 265;

C. I. Pigment blue 15, C.I. I. Pigment blue 15: 3, C.I. I. Pigment blue 15: 4, C.I. I. Pigment blue 15: 6, C.I. I. Pigment Blue 60
C. I. Pigment green 7, C.I. I. Pigment Green 36
C. I. Pigment brown 23, C.I. I. Pigment Brown 25
C. I. Pigment black 1, C.I. I. Pigment black 7 and the like.

  In the present invention, the combination of the above-mentioned pigments preferably used in combination is C.I. I. In pigment red 254, C.I. I. Pigment red 177, C.I. I. Pigment red 224, C.I. I. Pigment yellow 139 or C.I. I. A combination with Pigment Violet 23; I. In Pigment Green 36, C.I. I. Pigment yellow 150, C.I. I. Pigment yellow 139, C.I. I. Pigment yellow 185, C.I. I. Pigment yellow 138 or C.I. I. A combination with CI Pigment Yellow 180, and C.I. I. In Pigment Blue 15: 6, C.I. I. Pigment violet 23 or C.I. I. A combination with Pigment Blue 60 is mentioned.

  C. in the pigment when used together in this way. I. Pigment red 254, C.I. I. Pigment green 36, C.I. I. Pigment Blue 15: 6 content is C.I. I. The pigment red 254 is preferably 80% by mass or more, particularly preferably 90% by mass or more. C. I. The pigment green 36 is preferably 50% by mass or more, particularly preferably 60% by mass or more. C. I. Pigment Blue 15: 6 is preferably 80% by mass or more, and particularly preferably 90% by mass or more.

  The pigment is desirably used as a dispersion. This dispersion can be prepared by adding and dispersing a composition obtained by previously mixing the pigment and the pigment dispersant in an organic solvent (or vehicle) described later. The vehicle refers to a portion of a medium in which a pigment is dispersed when the paint is in a liquid state, and is a liquid portion (binder) that bonds with the pigment and hardens the coating film, and dissolves and dilutes the portion. Component (organic solvent). The disperser used for dispersing the pigment is not particularly limited. For example, a kneader described in Kazuzo Asakura, “Encyclopedia of Pigments”, First Edition, Asakura Shoten, 2000, page 438, Known dispersers such as a roll mill, an atrider, a super mill, a dissolver, a homomixer, and a sand mill can be used. Further, it may be finely pulverized by frictional force by mechanical grinding described in page 310 of the document.

  The colorant (pigment) used in the present invention preferably has a number average particle size of 0.001 to 0.1 μm, more preferably 0.01 to 0.08 μm. By setting it as the said range, since the improvement of contrast is seen without the cancellation | release of the polarization by a pigment occurring, it is preferable. The “particle size” as used herein refers to the diameter when the electron micrograph image of the particle is a circle of the same area, and the “number average particle size” refers to the above particle size for a number of particles, The average value of 100 is said.

The contrast of colored pixels such as red pixels, green pixels, and blue pixels defined in the present invention can be achieved by reducing the particle size of the dispersed pigment. Reduction of the particle size can be achieved by adjusting the dispersion time of the pigment dispersion. For dispersion, the known disperser described above can be used. The dispersion time is preferably 10 to 30 hours, more preferably 18 to 30 hours, and most preferably 24 to 30 hours. By setting the dispersion time in the above range, the particle diameter of the pigment can be reduced, and therefore, the polarization is not easily eliminated by the pigment, and the contrast is hardly lowered.
Further, in order to make the difference in contrast between two or more colored pixels within 600, the pigment particle diameter is adjusted to obtain a desired contrast.

(Other additives)
-Solvent-
In the colored photosensitive resin composition in the present invention, an organic solvent may be further used in addition to the above components. Examples of the organic solvent include methyl ethyl ketone, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, cyclohexanone, cyclohexanol, methyl isobutyl ketone, ethyl lactate, methyl lactate, caprolactam and the like.

-Surfactant-
Conventionally used color filters have a problem that the color of each pixel becomes dark in order to achieve high color purity, and the film thickness unevenness of the pixel is recognized as color unevenness as it is. For this reason, it has been demanded to improve the film thickness variation during the formation (application) of the resin layer, which directly affects the pixel film thickness.
In the color filter in the present invention or the resin transfer material in the present invention, the colored photosensitive resin composition can be controlled to have a uniform film thickness and effectively prevent coating unevenness (color unevenness due to film thickness fluctuation). It is preferable to contain an appropriate surfactant therein.
Preferred examples of the surfactant include surfactants disclosed in JP-A Nos. 2003-337424 and 11-133600.

-Thermal polymerization inhibitor-
The colored photosensitive resin composition in the present invention preferably contains a thermal polymerization inhibitor. Examples of the thermal polymerization inhibitor include hydroquinone, hydroquinone monomethyl ether, p-methoxyphenol, di-t-butyl-p-cresol, pyrogallol, t-butylcatechol, benzoquinone, 4,4′-thiobis (3-methyl). -6-t-butylphenol), 2,2'-methylenebis (4-methyl-6-t-butylphenol), 2-mercaptobenzimidazole, phenothiazine and the like.

-UV absorber-
The colored photosensitive resin composition in the present invention may contain an ultraviolet absorber as necessary. Examples of the ultraviolet absorber include salicylate-based, benzophenone-based, benzotriazole-based, cyanoacrylate-based, nickel chelate-based, hindered amine-based compounds and the like in addition to the compounds described in JP-A-5-72724.
Specifically, phenyl salicylate, 4-t-butylphenyl salicylate, 2,4-di-t-butylphenyl-3 ′, 5′-di-t-4′-hydroxybenzoate, 4-t-butylphenyl salicylate 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2 '-Hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole, ethyl-2-cyano-3,3-diphenyl acrylate, 2,2'-hydroxy-4-methoxybenzophenone, nickel Dibutyldithiocarbamate, bis (2,2,6,6-tetramethyl-4-pyridine) -Sebakei 4-t-butylphenyl salicylate, phenyl salicylate, 4-hydroxy-2,2,6,6-tetramethylpiperidine condensate, succinic acid-bis (2,2,6,6-tetramethyl-4-piperidenyl ) -Ester, 2- [2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 7-{[4-chloro-6- (diethylamino) -5-triazine- 2-yl] amino} -3-phenylcoumarin and the like.

  Moreover, in the colored photosensitive resin composition in this invention, the "adhesion adjuvant" described in Unexamined-Japanese-Patent No. 11-133600, other additives, etc. other than the said additive can be contained.

<Photosensitive resin transfer material>
The color filter layer in the present invention can be produced by transferring a photosensitive resin transfer material. The photosensitive resin transfer material is preferably formed using a photosensitive resin transfer material described in JP-A-5-72724, that is, an integral film. As an example of the structure of the integral film, there may be mentioned a structure in which a temporary support / thermoplastic resin layer / intermediate layer / photosensitive resin layer / protective film are laminated in this order.
The photosensitive resin transfer material in the present invention is preferably provided with a resin layer by using the above-mentioned colored photosensitive resin composition in the present invention.

(Temporary support)
The temporary support for the transfer material is preferably flexible and does not cause significant deformation, shrinkage or elongation even under pressure or under pressure and heat. Examples of such a support include a polyethylene terephthalate film, a cellulose triacetate film, a polystyrene film, and a polycarbonate film, and among them, a biaxially stretched polyethylene terephthalate film is particularly preferable.
Although there is no restriction | limiting in particular in the thickness of a temporary support body, the range of 5-200 micrometers is common, and especially the thing of the range of 10-150 micrometers is advantageous from points, such as ease of handling and versatility, and preferable. Further, the temporary support may be transparent, or may contain dyed silicon, alumina sol, chromium salt, zirconium salt or the like.

(Thermoplastic resin layer)
As the component used for the thermoplastic resin layer, organic polymer materials described in JP-A-5-72724 are preferable. It is particularly preferable that the softening point by the measurement method is selected from organic polymer substances having a temperature of about 80 ° C. or less. Specifically, polyolefins such as polyethylene and polypropylene, ethylene copolymers such as ethylene and vinyl acetate or saponified products thereof, ethylene and acrylic acid esters or saponified products thereof, polyvinyl chloride, vinyl chloride and vinyl acetate and saponified products thereof. Vinyl chloride copolymer such as fluoride, polyvinylidene chloride, vinylidene chloride copolymer, polystyrene, styrene copolymer such as styrene and (meth) acrylic acid ester or saponified product thereof, polyvinyl toluene, vinyl toluene and (meta ) Vinyl toluene copolymer such as acrylic ester or saponified product thereof, poly (meth) acrylic ester, (meth) acrylic ester copolymer such as butyl (meth) acrylate and vinyl acetate, vinyl acetate copolymer Combined nylon, copolymer nylon, N-alkoxyme Le nylon, and organic polymeric polyamide resins such as N- dimethylamino nylon.

(Middle layer)
In the photosensitive resin transfer material in the present invention, it is preferable to provide an intermediate layer for the purpose of preventing mixing of components at the time of application of a plurality of application layers and at the time of storage after application. As the intermediate layer, it is preferable to use an oxygen-blocking film having an oxygen-blocking function, which is described as “separation layer” in JP-A-5-72724. This reduces the time load and improves productivity.
The oxygen barrier film is preferably one that exhibits low oxygen permeability and is dispersed or dissolved in water or an aqueous alkali solution, and can be appropriately selected from known ones. Among these, a combination of polyvinyl alcohol and polyvinyl pyrrolidone is particularly preferable.

(Protective film)
A thin protective film is preferably provided on the resin layer in order to protect it from contamination and damage during storage. The protective film may be made of the same or similar material as the temporary support, but it must be easily separated from the resin layer. For example, silicone paper, polyolefin or polytetrafluoroethylene sheet is suitable as the protective film material.

(Method for producing photosensitive resin transfer material)
In the photosensitive resin transfer material in the present invention, a thermoplastic resin layer is provided by applying a coating solution (a coating solution for a thermoplastic resin layer) in which an additive for a thermoplastic resin layer is dissolved on a temporary support, followed by drying. Then, a solution of an intermediate layer material composed of a solvent that does not dissolve the thermoplastic resin layer on the thermoplastic resin layer is applied and dried, and then the resin layer of the colored photosensitive resin composition is applied with a solvent that does not dissolve the intermediate layer, It can be produced by drying.
Also, a sheet provided with the thermoplastic resin layer and the intermediate layer on the temporary support and a sheet provided with the photosensitive resin layer on the protective film are prepared, and the intermediate layer and the photosensitive resin layer are in contact with each other. In addition, a sheet provided with a thermoplastic resin layer on the temporary support and a sheet provided with a photosensitive resin layer and an intermediate layer on a protective film are prepared, and a thermoplastic resin layer is prepared. Can also be produced by bonding them so that the intermediate layer is in contact with each other.
In the photosensitive resin transfer material of the present invention, the thickness of the resin layer of the colored photosensitive resin composition is preferably 1.0 to 5.0 μm, more preferably 1.0 to 4.0 μm. 0-3.0 micrometers is especially preferable.
Although not particularly limited, preferred film thicknesses of the other layers are 2-30 μm for the thermoplastic resin layer, 0.5-3.0 μm for the intermediate layer, and 4-40 μm for the protective film, Is preferable.

  In addition, although application | coating in the said preparation method can be performed with a well-known coating apparatus etc., in this invention, it is preferable to perform with the coating apparatus (slit coater) using a slit-shaped nozzle.

(Slit nozzle)
The color filter layer in the present invention can be formed directly on the substrate by a step of applying and drying the colored photosensitive resin composition by a known coating method, and also using the photosensitive resin transfer material. You can also. In the present invention, the colored photosensitive resin composition is applied to a substrate or a temporary support, and as a coating method, it is preferable to apply the colored photosensitive resin composition using a slit-like nozzle having a slit-like hole in a portion where the liquid is discharged.
Specifically, JP-A-2004-89851, JP-A-2004-17043, JP-A-2003-170098, JP-A-2003-164787, JP-A-2003-10767, JP-A-2002-79163. Slit nozzles and slit coaters described in Japanese Patent Laid-Open No. 2001-310147 and the like are preferably used.
Moreover, you may apply | coat a coloring photosensitive resin composition to a board | substrate by the inkjet method.

<Method for producing color filter layer>
(Resin layer)
In the color filter (layer) of the present invention, each of the resin layers of red (R), green (G), and blue (B) has at least C.I. I. The colored photosensitive resin composition using CI Pigment Red 254, at least C.I. I. The colored photosensitive resin composition using CI Pigment Green 36, at least C.I. I. It is preferably formed by the colored photosensitive resin composition using Pigment Blue 15: 6.
Satisfying the above requirements is effective in realizing high color purity and wide color reproducibility even when used in a liquid crystal display device having a high contrast and a large screen.

The color filter (layer) in the present invention can be produced by a known method such as a method in which a resin layer is formed on a substrate, and exposure and development are repeated by the number of colors. If necessary, the boundary may be divided by a black matrix.
In the above production method, as the method for forming the resin layer on the substrate, (a) a method of applying each of the above colored photosensitive resin compositions with a known coating apparatus or the like, and (b) the above-described photosensitive property. A method of using a resin transfer material and attaching with a laminator can be used.

(A) Application by coating apparatus In the method for producing a color filter in the present invention, a known photosensitive coating method such as a spin coating method, a curtain coating method, a slit coating method, or a dip coating method is used for coating the colored photosensitive resin composition. It can be applied by an air knife coating method, a roller coating method, a wire bar coating method, a gravure coating method, or an extrusion coating method using a popper described in US Pat. No. 2,681,294. In particular, the slit coater already described in the section <Photosensitive resin transfer material> can be preferably used. The preferred specific example of the slit coater is the same as described above. When the resin layer is formed by coating, the film thickness is preferably 1.0 to 3.0 μm, more preferably 1.0 to 2.5 μm, and particularly preferably 1.0 to 2.0 μm.

(B) Affixing with a laminator Using the photosensitive resin transfer material of the present invention, the resin layer formed in a film shape is pressure-bonded or heat-pressed with a roller or flat plate heated and / or pressed on a substrate to be described later. Can be pasted. Specific examples include laminators and laminating methods described in JP-A-7-110575, JP-A-11-77942, JP-A-2000-334836, and JP-A-2002-148794. From this point of view, it is preferable to use the method described in JP-A-7-110575. The preferred film thickness when the resin layer is formed from the photosensitive resin transfer material in the present invention is the same as the preferred film thickness described in the section <Photosensitive resin transfer material>.

(Oxygen barrier membrane)
In producing the color filter (layer) in the present invention, in the case where the photosensitive resin layer is formed by applying the colored photosensitive resin composition, an oxygen-blocking film can be further provided on the resin layer. , Exposure sensitivity can be increased. Examples of the oxygen blocking film include those already described in the section of (Interlayer) of <Photosensitive resin transfer material>. Although not particularly limited, the thickness of the oxygen blocking film is preferably 0.5 to 3.0 μm.

(Exposure and development)
A step of disposing a predetermined mask above the resin layer formed on the substrate, then exposing from above the mask through the mask, the thermoplastic resin layer, and the intermediate layer, and then developing with a developer. Is repeated for the number of colors to obtain the color filter of the present invention.
Here, the light source for the exposure can be appropriately selected and used as long as it can irradiate light in a wavelength region capable of curing the photosensitive resin layer (for example, 365 nm, 405 nm, etc.). Specifically, an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a metal halide lamp, etc. are mentioned. As an exposure amount, it is about 5-200 mJ / cm < ² > normally, Preferably it is about 10-100 mJ / cm < ² >.

The developer is not particularly limited, and a known developer such as that described in JP-A-5-72724 can be used. The developer is preferably one in which the photosensitive resin layer exhibits a dissolution type development behavior. For example, a developer containing a compound having a pKa of 7 to 13 at a concentration of 0.05 to 5 mol / L is preferable. A small amount of a miscible organic solvent may be added.
Examples of organic solvents miscible with water include methanol, ethanol, 2-propanol, 1-propanol, butanol, diacetone alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-butyl ether, and benzyl alcohol. , Acetone, methyl ethyl ketone, cyclohexanone, ε-caprolactone, γ-butyrolactone, dimethylformamide, dimethylacetamide, hexamethylphosphoramide, ethyl lactate, methyl lactate, ε-caprolactam, N-methylpyrrolidone and the like. The concentration of the organic solvent is preferably 0.1% by mass to 30% by mass.
Further, a known surfactant can be further added to the developer. The concentration of the surfactant is preferably 0.01% by mass to 10% by mass.

As a development method, a known method such as paddle development, shower development, shower & spin development, dip development or the like can be used.
Here, the shower development will be described. The uncured portion can be removed by spraying a developer onto the exposed resin layer by shower. In addition, it is preferable to spray an alkaline solution having a low solubility of the resin layer by a shower or the like before development to remove the thermoplastic resin layer, the intermediate layer, and the like. Further, after development, it is preferable to remove the development residue while spraying a cleaning agent or the like with a shower and rubbing with a brush or the like.
As the cleaning liquid, known ones can be used, including (phosphate, silicate, nonionic surfactant, antifoaming agent and stabilizer, trade name “T-SD1 (manufactured by Fuji Photo Film Co., Ltd.)”, or Sodium carbonate / phenoxyoxyethylene surfactant-containing, trade name “T-SD2 (Fuji Photo Film Co., Ltd.)”) is preferred.
The liquid temperature of the developer is preferably 20 ° C. to 40 ° C., and the pH of the developer is preferably 8 to 13.

In the production of the color filter (layer), as described in JP-A Nos. 11-248921 and 3255107, a colored photosensitive resin composition for forming a color filter is layered to form a base, It is preferable from the viewpoint of cost reduction that a transparent electrode is formed on the spacer and a spacer is further formed by overlapping projections for split orientation.
When the colored photosensitive resin composition is sequentially applied and stacked, the film thickness becomes thin each time the coating is performed due to the leveling of the coating solution. For this reason, it is preferable to overlap the four colors of K (black), R, G, and B, and further overlap the divisional alignment protrusions. On the other hand, in the case of using a photosensitive transfer material having a thermoplastic resin layer, it is preferable to set three or two colors to be overlapped because the thickness is kept constant.
The size of the base is preferably 25 μm × 25 μm or more, particularly preferably 30 μm × 30 μm or more, from the viewpoint of preventing deformation of the resin layer when the transfer material is laminated and laminating and maintaining a certain thickness.

  The liquid crystal display device of the present invention includes a reflector, a light guide plate, a diffusing plate, and a lens for effectively utilizing light from a driver, a driving circuit, and a backlight source for applying a voltage to the electrodes as necessary. An optical compensation film such as a sheet, a front protective film, an antireflection film, or the like can be used. In addition, the liquid crystal display device of the present invention can use known constituent elements other than those that can be used in the liquid crystal display device.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail using an Example, this invention is not limited to this. In the examples, “parts” and “%” mean mass parts and mass%, respectively.

Example 1
[Preparation of color filter (preparation by application using slit nozzle)]
-Formation of black (K) image-
The alkali-free glass substrate was cleaned with a UV cleaning apparatus, then brush-cleaned with a cleaning agent, and further ultrasonically cleaned with ultrapure water. The substrate was heat-treated at 120 ° C. for 3 minutes to stabilize the surface state.
After cooling the substrate and adjusting the temperature to 23 ° C., the following colored photosensitive resin composition is used with a glass substrate coater (manufactured by FS Asia Co., Ltd., trade name: MH-1600) having a slit-like nozzle. K1 was applied. Subsequently, a part of the solvent was dried by VCD (vacuum drying apparatus; manufactured by Tokyo Ohka Kogyo Co., Ltd.) for 30 seconds to eliminate the fluidity of the coating layer, and then pre-baked at 120 ° C. for 3 minutes to obtain a film thickness of 2.4 μm. The photosensitive resin layer K1 was obtained.

With a proximity type exposure machine (manufactured by Hitachi High-Tech Electronics Engineering Co., Ltd.) with an ultra-high pressure mercury lamp, with the substrate and mask (quartz exposure mask with image pattern) standing vertically, the exposure mask surface and the photosensitivity The distance between the resin layers was set to 200 μm, and pattern exposure was performed with an exposure amount of 300 mJ / cm ² .

  Next, after spraying pure water with a shower nozzle to uniformly wet the surface of the photosensitive resin layer K1, a KOH developer (KOH, containing nonionic surfactant, trade name: CDK-1, (Fujifilm Electronics Materials Co., Ltd., 100-fold diluted) was subjected to shower development at 23 ° C. for 80 seconds and a flat nozzle pressure of 0.04 MPa to obtain a patterning image. Subsequently, ultrapure water was sprayed at a pressure of 9.8 MPa with an ultrahigh pressure washing nozzle to remove the residue, and a black (K) image was obtained. Subsequently, heat treatment was performed at 220 ° C. for 30 minutes.

-Formation of red (R) pixels-
A heat-treated red (R) pixel was formed on the substrate on which the K image was formed by using the following colored photosensitive resin composition R1 in the same process as the formation of the black (K) image.

-Formation of green (G) pixels-
A heat-treated green (G) pixel was formed on the substrate on which the K image and R pixel were formed by using the following colored photosensitive resin composition G1 in the same process as the formation of the black (K) image.

-Formation of blue (B) pixels-
Using the following colored photosensitive resin composition B1 on the substrate on which the K image, R, and G pixels are formed, heat-treated blue (B) pixels are formed in the same process as the formation of the black (K) image. The target color filter was obtained.

<Preparation of colored photosensitive resin composition>
The preparation of the colored photosensitive resin compositions K1, R1, R11, G1, G11, B1 and B11 will be described below.

-Preparation of colored photosensitive resin composition K1-
Weigh K (black) pigment dispersion 1 and propylene glycol monomethyl ether acetate in the amounts listed in Table 1, mix at a temperature of 24 ° C. (± 2 ° C.) and stir at 150 rpm for 10 minutes, then list in Table 1. Methyl ethyl ketone, binder 1, hydroquinone monomethyl ether, DPHA solution, 2,4-bis (trichloromethyl) -6- [4 '-(N, N-bisethoxycarbonylmethyl) amino-3'-bromophenyl]- Colored photosensitive resin composition by weighing s-triazine and surfactant 1 and adding them in this order at a temperature of 25 ° C. (± 2 ° C.) and stirring at a temperature of 40 ° C. (± 2 ° C.) at 150 rpm for 30 minutes. Product K1 was obtained. Each addition amount is as shown in Table 1.

The black pigment dispersion 1 was obtained by mixing the following compositions.
Carbon black (NIPX35, manufactured by Degussa) 13.1 partsN, N'-bis- (3-diethylaminopropyl) -5- {4- [2-oxo-1- (2-oxo-2,3- Dihydro-1H-benzimidazol-5-ylcarbamoyl) -propylazo] -benzoylamino} -isophthalamide
0.65 parts-Polymer (benzyl methacrylate / methacrylic acid = 72/28 molar ratio random copolymer, weight average molecular weight 37,000) 6.72 parts-Propylene glycol monomethyl ether acetate 79.53 parts

-Preparation of colored photosensitive resin compositions R1, R11-
The R pigment dispersion 1, R pigment dispersion 2, and propylene glycol monomethyl ether acetate in the amounts shown in Table 2 are weighed, mixed at a temperature of 24 ° C. (± 2 ° C.), and stirred at 150 rpm for 10 minutes. 2, methyl ethyl ketone, binder 2, DPHA solution, 2-trichloromethyl-5- (p-styrylstyryl) -1,3,4-oxadiazole, 2,4-bis (trichloromethyl) -6- [4 ′-(N, N-bisethoxycarbonylmethyl) amino-3′-bromophenyl] -s-triazine and phenothiazine are weighed out and added in this order at a temperature of 24 ° C. (± 2 ° C.) and then at 150 rpm for 30 minutes. Then, the surfactant 1 (ED152 in the case of the colored photosensitive resin composition R11) is weighed and added at a temperature of 24 ° C. (± 2 ° C.). Stirred for 5 minutes at rpm, it was obtained by filtering with a nylon mesh # 200. The addition amounts are as shown in Table 2.

(Preparation of R pigment dispersions 1 and 2)
The following components of R pigment dispersions 1 and 2 were dispersed for 21 hours at a peripheral speed of 12.5 m / s using a motor mill M-50 (manufactured by Eiger Japan) and CIP-treated zirconia beads having a diameter of 0.30 mm. Then, each of the above dispersions was prepared.

(Composition of R pigment dispersion 1)
・ C. I. Pigment Red 254 (trade name: Irgaphor Red B-CF, manufactured by Ciba Specialty Chemicals) 8 parts N, N'-bis- (3-diethylaminopropyl) -5- {4- [2-oxo -1- (2-oxo-2,3-dihydro-1H-benzimidazol-5-ylcarbamoyl) -propylazo] -benzoylamino} -isophthalamide 0.8 parts polymer (benzyl methacrylate / methacrylic acid = 72/28 Random copolymer of molar ratio, weight average molecular weight 37,000) 8 parts ・ Propylene glycol monomethyl ether acetate 83.2 parts

(Composition of R pigment dispersion 2)
・ C. I. Pigment Red 177 (trade name: Chromophthal Red A2B, manufactured by Ciba Specialty Chemicals Co., Ltd.) 18 parts Polymer (random copolymer of benzyl methacrylate / methacrylic acid = 72/28 molar ratio, weight average molecular weight 3.7) 10,000 parts) 12 parts ・ 70 parts propylene glycol monomethyl ether acetate

-Preparation of colored photosensitive resin compositions G1 and G11-
The amount of G pigment dispersion 1, Y pigment dispersion 1, and propylene glycol monomethyl ether acetate in the amounts shown in Table 3 are weighed out, mixed at a temperature of 24 ° C. (± 2 ° C.), and stirred at 150 rpm for 10 minutes. 3, methyl ethyl ketone, cyclohexanone, binder 1, DPHA solution, 2-trichloromethyl-5- (p-styrylstyryl) -1,3,4-oxadiazole, 2,4-bis (trichloromethyl)- 6- [4 ′-(N, N-bisethoxycarbonylmethyl) amino-3′-bromophenyl] -s-triazine and phenothiazine are weighed out and added in this order at a temperature of 24 ° C. (± 2 ° C.) at 150 rpm. Stir for 30 minutes, then weigh out Surfactant 1, add it at a temperature of 24 ° C. (± 2 ° C.), stir at 30 rpm for 5 minutes. Obtained by filtration Interview # 200. The amount added is as shown in Table 3.

(Preparation of G pigment dispersion 1 and Y pigment dispersion 1)
The following components of G pigment dispersion 1 and Y pigment dispersion 1 were used at a peripheral speed of 12.5 m / s using a motor mill M-50 (manufactured by Eiger Japan) and CIP-treated zirconia beads having a diameter of 0.30 mm. The above dispersions were prepared by dispersing for 19 hours for the G pigment dispersion and 22 hours for the Y pigment dispersion.

(Composition of G pigment dispersion 1)
・ C. I. Pigment Green 36 (trade name: Rionol Green 6YK,
Toyo Ink Mfg. Co., Ltd.) 14 parts / polymer (benzyl methacrylate / methacrylic acid = 72/28 molar ratio random copolymer, weight average molecular weight 37,000) 23 parts / N, N′-bis- (3 -Diethylaminopropyl) -5- {4- [2-oxo-1- (2-oxo-2,3-dihydro-1H-benzimidazol-5-ylcarbamoyl) -propylazo] -benzoylamino} -isophthalamide 4 parts ・ Propylene glycol monomethyl ether acetate 61.6 parts

(Composition of Y pigment dispersion 1)
・ C. I. Pigment Yellow 150 (trade name: Bayplast Yellow 5GN 01, Bayer Co., Ltd.) 15 parts Polymer (benzyl methacrylate / methacrylic acid = 72/28 molar ratio random copolymer, weight average molecular weight 37,000) 9 parts N, N′-bis- (3-diethylaminopropyl) -5- {4- [2-oxo-1- (2-oxo-2,3-dihydro-1H-benzimidazol-5-ylcarbamoyl) -propylazo] -Benzoylamino} -isophthalamide 1.5 parts propylene glycol monomethyl ether acetate 74.5 parts

-Preparation of colored photosensitive resin compositions B1 and B11-
The B pigment dispersion 1 and propylene glycol monomethyl ether acetate described in Table 4 below are weighed, mixed at a temperature of 24 ° C. (± 2 ° C.) and stirred at 150 rpm for 10 minutes, and then methyl ethyl ketone described in Table 4 below. Binder 3, DPHA solution, 2-trichloromethyl-5- (p-styrylstyryl) -1,3,4-oxadiazole and phenothiazine are weighed and added in this order at a temperature of 25 ° C. (± 2 ° C.). Stir at a temperature of 40 ° C. (± 2 ° C.) at 150 rpm for 30 minutes, further weigh out the amount of surfactant 1 listed in Table 4, add it at a temperature of 24 ° C. (± 2 ° C.), and stir at 30 rpm for 5 minutes. And filtered through nylon mesh # 200. The addition amounts are as shown in Table 4.

(Preparation of pigment dispersion 1)
The following components of the pigment dispersion 1 were dispersed for 19 hours at a peripheral speed of 12.5 m / s using a motor mill M-50 (manufactured by Eiger) and CIP-treated zirconia beads having a diameter of 0.30 mm for 19 hours. A dispersion of was prepared.

(Composition of B pigment dispersion 1)
・ C. I. Pigment Blue 15: 6 (trade name: Rionol Blue ES,
Toyo Ink Manufacturing Co., Ltd.) 11.28 parts C.I. I. Pigment Violet 23 (trade name: Hostaperm Violet RL-NF, manufactured by Clariant Japan Co., Ltd.) 0.72 parts EFKA-745 (manufactured by EFKA ADDITIVES BV)
0.6 parts ・ Dispalon DA-725 (Enomoto Kasei Co., Ltd.) 0.75 parts ・ Propylene glycol monomethyl ether acetate 86.65 parts

The composition of the binder 1 is
・ Polymer (Random copolymer of benzyl methacrylate / methacrylic acid = 78/22 molar ratio, weight average molecular weight 40,000) 27 parts ・ Propylene glycol monomethyl ether acetate 73 parts

The composition of binder 2 is
・ Polymer (benzyl methacrylate / methacrylic acid / methyl methacrylate = 38/25/37 molar ratio random copolymer, weight average molecular weight 30,000) 27 parts ・ Propylene glycol monomethyl ether acetate 73 parts

The composition of binder 3 is
27 parts of polymer (random copolymer of benzyl methacrylate / methacrylic acid / methyl methacrylate = 36/22/42 molar ratio, weight average molecular weight 30,000). 73 parts of propylene glycol monomethyl ether acetate.

The composition of the DPHA solution is
・ Dipentaerythritol hexaacrylate (containing polymerization inhibitor MEHQ 500 ppm, Nippon Kayaku Co., Ltd., trade name: KAYARAD DPHA) 76 parts ・ Propylene glycol monomethyl ether acetate 24 parts

The composition of Surfactant 1 (Dainippon Ink Chemical Co., Ltd., trade name: Megafac F780F)
_{· C 6 F 13 CH 2 CH} 2 OCOCH = CH 2: and 40 _{parts, H (OCH (CH 3)} CH 2) 7 OCOCH = CH 2: and 55 _{parts, H (OCH 2 CH 2)} 7 OCOCH = CH 2 : 5 parts copolymer, weight average molecular weight 3030 parts, methyl ethyl ketone 70 parts.
As the ED152, a phosphate ester special activator (manufactured by Enomoto Kasei Co., Ltd., trade name: HIPLAAD ED152) was used.

[Production of liquid crystal display devices]
Resin spacers were formed on the pixels of the color filter produced above.
Next, a transparent electrode layer of ITO (Indium Tin Oxide) was formed and patterned for the PVA mode.
Further, a polyimide alignment film was provided thereon. An epoxy resin sealant is applied to the position corresponding to the outer frame of the black matrix provided around the pixel group of the color filter, and the PVA mode liquid crystal is dropped in a vacuum and superimposed on the counter substrate. It returned to atmospheric pressure and bonded together by pressurization by atmospheric pressure to obtain a liquid crystal cell.
Next, the bonded glass substrate was subjected to ultraviolet treatment to cure the sealing material.
A polarizing plate HLC2-2518 manufactured by Sanritsu Co., Ltd. was attached to both sides of the liquid crystal cell so as to be crossed Nicol. Next, FR1112H (Stanley Corporation chip type LED) as red (R) LED, DG1112H (Stanley Corporation chip type LED) as green (G) LED, and DB1112H (Stanley Corporation as blue (B) LED) ) Manufactured chip type LED), a side-light type backlight was constructed and installed on the back side of the liquid crystal cell provided with the polarizing plate, thereby producing a liquid crystal display device having a screen size of 25 inches.

(Examples 2 to 4)
In [Production of liquid crystal display device] in Example 1,
A liquid crystal display device was manufactured in the same manner as in Example 1 except that the screen size was changed to 20, 15, and 10 inches instead of 25 inches.

(Example 5)
[Production of color filter (production by lamination of photosensitive resin transfer material)]
-Production of photosensitive resin transfer material-
On a 75 μm thick polyethylene terephthalate film temporary support, a coating solution for a thermoplastic resin layer having the following formulation H1 was applied and dried using a slit nozzle. Next, an intermediate layer coating solution having the following formulation P1 was applied and dried. Furthermore, the colored photosensitive resin composition K1 is applied and dried, and a thermoplastic resin layer having a dry film thickness of 14.6 μm, an intermediate layer having a dry film thickness of 1.6 μm, A photosensitive resin layer having a film thickness of 2.4 μm was provided, and a protective film (12 μm thick polypropylene film) was pressure-bonded.
In this way, a photosensitive resin transfer material in which the temporary support, the thermoplastic resin layer, the intermediate layer (oxygen barrier film), and the black (K) photosensitive resin layer are integrated is prepared, and the sample name is the photosensitive resin transfer material. It was set as K1.

(Coating solution for thermoplastic resin layer: Formulation H1)
Methanol 11.1 parts Propylene glycol monomethyl ether 6.36 parts Methyl ethyl ketone 52.4 parts Methyl methacrylate / 2-ethylhexyl acrylate / benzyl methacrylate / methacrylic acid copolymer (copolymerization composition ratio (molar ratio) = 55 / 11.7 / 4.5 / 28.8, weight average molecular weight = 100,000, Tg≈70 ° C.) 5.83 parts styrene / acrylic acid copolymer (copolymerization composition ratio (molar ratio) = 63/37, (Weight average molecular weight = 10,000, Tg≈100 ° C.) 13.6 parts · A compound obtained by dehydration condensation of 2 equivalents of bisphenol A and pentaethylene glycol monomethacrylate (made by Shin-Nakamura Chemical Co., Ltd., trade name: 2, 2- Bis [4- (methacryloxypolyethoxy) phenyl] propane)) 9.1 parts fluorine-based polymer (Dainippon Ink, product : Megafac _{F780F, C 6 F 13 CH 2} CH 2 OCOCH = CH 2 40 parts of _{H (OCH (CH 3) CH} 2) 7 OCOCH = CH 2 55 parts of _{H (OCH 2 CH 2) 7} OCOCH = CH 2 Copolymer with 5 parts, weight average molecular weight 30,000, methyl ethyl ketone 30% solution) 0.54 parts

(Coating liquid for intermediate layer: prescription P1)
PVA205 (polyvinyl alcohol, manufactured by Kuraray Co., Ltd., saponification degree = 88%, polymerization degree 550) 32.2 partsPolyvinylpyrrolidone (manufactured by IS Japan Co., Ltd., K-30) 14.9 parts distilled water 524 partsMethanol 429 parts

<Preparation of photosensitive resin transfer materials R11, G11 and B11>
Next, in the production of the photosensitive resin transfer material K1, the same method as above except that the colored photosensitive resin composition K1 is changed to the colored photosensitive resin compositions R11, G11, and B11. Photosensitive resin transfer materials R11, G11 and B11 were produced.

-Formation of black (K) image-
The alkali-free glass substrate was washed with a rotating brush having nylon hair while spraying a glass detergent solution adjusted to 25 ° C. for 20 seconds by showering, and after washing with pure water shower, silane coupling solution (N-β (aminoethyl)) A 0.3% by mass aqueous solution of γ-aminopropyltrimethoxysilane, trade name: KBM603, manufactured by Shin-Etsu Chemical Co., Ltd.) was sprayed for 20 seconds with a shower and washed with pure water. This substrate was heated at 100 ° C. for 2 minutes with a substrate preheating device and sent to the next laminator.
After peeling off the protective film of the photosensitive resin transfer material K1, a substrate heated to 100 ° C. using a laminator (Lamic II type manufactured by Hitachi Industries, Ltd.), a rubber roller temperature of 130 ° C. and a linear pressure is used. Lamination was performed at 100 N / cm and a conveyance speed of 2.2 m / min.
After peeling off the temporary support, with a proximity type exposure machine (manufactured by Hitachi High-Tech Electronics Engineering Co., Ltd.) having an ultra-high pressure mercury lamp, with the substrate and mask (quartz exposure mask with image pattern) standing vertically, The distance between the exposure mask surface and the photosensitive resin layer was set to 200 μm, and pattern exposure was performed at an exposure amount of 70 mJ / cm ² .

Next, a triethanolamine developer (triethanolamine 30% by mass, polypropylene glycol, glycerol monostearate, polyoxyethylene sorbitan monostearate, stearyl ether in total 0.1% by mass, the balance of pure water The stock solution prepared and stored was diluted 12 times with pure water (a solution obtained by diluting the stock solution at a ratio of 11 parts by mass with 1 part by mass) at 30 ° C. for 50 seconds, flat nozzle pressure. Shower development was performed at 0.04 MPa, and the thermoplastic resin layer and the intermediate layer (oxygen barrier film) were removed.
Subsequently, Na carbonate-based developer (0.38 mol / liter sodium hydrogen carbonate, 0.47 mol / liter sodium carbonate, 5% by weight sodium dibutylnaphthalenesulfonate, anionic surfactant, antifoaming agent, stabilizer included , Trade name: T-CD1, manufactured by Fuji Photo Film Co., Ltd. diluted 5 times with pure water) and shower-developed at 29 ° C. for 30 seconds and a cone type nozzle pressure of 0.15 MPa to form a photosensitive resin layer. Development was performed to obtain a patterning image.
Subsequently, a detergent (containing phosphate, silicate, nonionic surfactant, antifoaming agent, stabilizer, trade name: T-SD1, manufactured by Fuji Photo Film Co., Ltd.) diluted 10 times with pure water) The residue was removed with a rotary brush having a shower and nylon bristles at 33 ° C. for 20 seconds and a cone type nozzle pressure of 0.02 MPa to obtain a black (K) image. Thereafter, the substrate was further post-exposed with light of 500 mJ / cm ^{2 with} an ultrahigh pressure mercury lamp from the resin layer side, and then heat treated at 220 ° C. for 15 minutes.
The substrate on which this black (K) image was formed was washed again with a brush as described above, and after pure water shower washing, the silane coupling solution was not used and was sent to a substrate preheating device.

-Formation of red (R) pixels-
In the formation of the image of (K), instead of using the substrate, the photosensitive resin transfer material K1, and the K image forming mask, the substrate on which the K image is formed, the photosensitive resin transfer material R1, and the R pixel formation A heat-treated red (R) pixel was obtained in the same process as the K image formation except that the mask for use was used. However, the exposure amount was 40 mJ / cm ² , development with a sodium carbonate-based developer was 35 ° C. for 35 seconds, and heat treatment was 220 ° C. for 15 minutes.
The substrate on which the K image and R pixels were formed was again cleaned with a brush as described above, and after pure water shower cleaning, the substrate was sent to a substrate preheating device without using a silane coupling solution.

-Formation of green (G) pixels-
In the formation of the image of (K), instead of using the substrate, the photosensitive resin transfer material K1, and the K image forming mask, the substrate on which the K image and R pixels are formed, the photosensitive resin transfer material G1, and A heat-treated green (G) pixel was obtained in the same process as the K image formation except that the G pixel formation mask was used. However, the exposure amount was 40 mJ / cm ² , development with a sodium carbonate-based developer was 34 ° C. for 45 seconds, and heat treatment was 220 ° C. for 15 minutes.
The substrate on which the K image and R and G pixels were formed was again cleaned with a brush as described above, and after pure water shower cleaning, the silane coupling liquid was not used and the substrate was sent to a substrate preheating apparatus.

-Formation of blue (B) pixels-
In the formation of the image of (K), instead of using the substrate, the photosensitive resin transfer material K1, and a K image forming mask, the substrate on which K image, R, and G pixels are formed, and the photosensitive resin transfer material A heat-treated blue (B) pixel was obtained in the same process as the formation of the K image except that the B1 and B pixel formation masks were used. However, the exposure amount was 30 mJ / cm ² , and development with a sodium carbonate-based developer was 36 ° C. for 40 seconds.
The substrate on which the K image, R, G, and B pixels were formed was baked at 240 ° C. for 50 minutes to obtain a target color filter.

[Production of liquid crystal display devices]
In the production of the liquid crystal display device of Example 1, a liquid crystal display device was produced in the same manner as in Example 1 except that the above color filter was used instead of using the color filter produced using the slit-shaped nozzle. did.

(Examples 6 to 8)
A liquid crystal display device was produced in the same manner as in Example 5 except that, in [Production of liquid crystal display device] in Example 5, the screen size was changed to 20, 15, and 10 inches, respectively.

(Examples 9 to 12, Comparative Example 1)
A liquid crystal display device was prepared in the same manner as in Example 2 except that the dispersion time of the colored photosensitive resin compositions R1, G1, and B1 was changed to the times shown in Table 6 in [Preparation of color filter] in Example 2. Produced.

(Comparative Examples 2-7)
In Comparative Example 1, [Production of color filter], the dispersion time was changed to the time shown in Table 6, and the backlight of [Production of liquid crystal display device] was used except that the cold cathode tube shown in Table 6 was used. Produced a liquid crystal display device in the same manner as in Comparative Example 1.

(Examples 13 to 15)
A liquid crystal display device was produced in the same manner as in Example 2 except that the polarizing plate in Table 7 was changed in [Production of liquid crystal display device] of Example 2.

[Evaluation]
-Contrast measurement-
The contrast of each colored pixel constituting the color filter (layer) obtained as described above was measured by the following measuring method, and the difference in contrast between the colored pixels was calculated. The results are shown in Tables 5-7.
(Contrast measurement method)
Using a three-wavelength cold-cathode tube light source (FWL18EX-N manufactured by Toshiba Lighting & Technology Co., Ltd.) as a backlight, a color filter was installed between two polarizing plates (G1220DUN manufactured by Nitto Denko Corporation). The X value contrast is obtained by dividing the X value of the chromaticity of the light that passes when the polarizing plates are installed in parallel (parallel Nicols) by the X value of the chromaticity of the light that passes when the polarizing plates are installed in crossed Nicols. Asked. The Y value and Z value of chromaticity were also measured in the same manner, and the contrast of the Y value and Z value was obtained. A color luminance meter (BM-5 manufactured by Topcon) was used for the measurement of chromaticity.
Two polarizing plates, a color filter, and a color luminance meter were installed at a position 13 mm from the backlight, a polarizing plate at a position 40 mm to 60 mm, and a cylinder 11 mm in diameter and 20 mm in length. Light was irradiated to a measurement sample installed at a position of 65 mm, and the transmitted light was measured with a color luminance meter installed at a position of 400 mm through a polarizing plate installed at a position of 100 mm. The measurement angle of the color luminance meter was set to 2 °. The light amount of the backlight was set so that the luminance when the two polarizing plates were installed in parallel Nicol was 1280 cd / m ² without the sample being installed.

[Measurement method of chromaticity]
Using a microspectrophotometer (OSP-100 manufactured by Olympus Optical Co., Ltd.), the transmission spectrum was measured with a pinhole diameter of 5 μm, and from the result, the chromaticity of the C light source field of view was calculated and obtained (Tokyo Denki University) (See page 73, Noboru Ota, 2nd edition, Color Optics, Publishing Bureau.)

[Evaluation method of color purity]
The solid color of the liquid crystal display device was displayed, the chromaticity was measured with a color luminance meter, and the color reproduction region was shown as a relative ratio to the NTSC ratio standard from the chromaticity of each RGB color.

[Evaluation method of vividness]
A sensory evaluation was performed by 50 subjects on the vividness when the color chart was displayed on the back of the liquid crystal display panel (apparatus) using the color filter produced in Examples and Comparative Examples. Evaluation was made in five stages in order of increasing vividness, and the average value was taken as the evaluation value. The results are shown in Tables 5-7.

As is clear from Tables 5 to 7, it can be seen that in Comparative Example 1 having a low contrast, the color purity is good, but the vividness is not good. Moreover, in the case of Comparative Examples 2-6 in which the peak wavelength of the backlight is out of the present invention, it can be seen that both the color purity and the vividness are poor. It can be seen that Comparative Example 7 in which both the contrast and the peak wavelength are off is not the best in terms of both color purity and vividness.
On the other hand, all of Examples 1 to 8 were excellent in terms of color purity and vividness, and particularly those having a screen size of 20 inches or more were most excellent in vividness. Moreover, from Examples 9, 10 and Examples 11, 12, it can be seen that the higher the contrast, the better the vividness.

Claims (7)

  A liquid crystal display device comprising: a backlight; a polarizing plate; at least two substrates; a liquid crystal layer sandwiched between the substrates; and a color filter layer provided on at least a part of the substrate. The filter layer has a green pixel satisfying 0.25 <x <0.32, y> 0.58 when the chromaticity is expressed in an x, y color system using a C light source; and A liquid crystal display device characterized in that a light emitting device having a contrast of X value, Y value, and Z value of the color filter layer of 1000 or more and having a peak wavelength between 520 and 540 nm is used as a light source.   The color filter layer has red pixels satisfying 0.60 <x and 0.30 <y <0.36 when the chromaticity is expressed in an x, y color system using a C light source. 2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device has a blue pixel satisfying 0.12 <x <0.15 and 0.08 <y <0.11.   The liquid crystal display device according to claim 1, wherein the contrast is 2000 or more.   The liquid crystal display device according to claim 1, wherein the contrast is 3000 or more.   The liquid crystal display device according to claim 1, wherein the light emitting device is a light emitting diode.   The liquid crystal display device according to claim 1, wherein the polarizing plate has a polarization degree of 99.9 or more.   The liquid crystal display device according to claim 1, wherein a screen size of the liquid crystal display device is 10 inches or more.