JPH07270611A - Color filter and liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain a color filter having a high transmittance, excellent characteristics such as solvent resistance, light resistance and heat resistance which can be used for a liquid crystal display device by specifying the product of the film thickness of the color filter layer and the total weight of the pigments and dispersant in the color filter to be a specified value or lower. CONSTITUTION:A color filter layer essentially comprising pigments, dispersant and resin is formed on a substrate or a film. The pigments are yellow, magenta and cyan pigments. The product of the film thickness of the color filter and the total wt.% of the pigments and dispersant in the color filter is specified to be <=60mum. The transmittance of the cyan pigment in the color filter layer is >=85% for 450 to 510nm wavelength and <=25% for 620 to be 650nm. The transmittance of the magenta pigment in the color filter layer is >=70% for 410 to 450nm, >=90% for 630 to 700nm, and <=25% for 530 to 560nm. The transmittance of the yellow pigment is <=20% for 430 to 460nm and >=85% for 550 to 700nm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a color video camera,
A color filter for a solid-state image sensor used in an image scanner or the like and a suitable color filter can be provided by being provided in a liquid crystal cell of a color liquid crystal display device. More specifically, a TN (twisted nematic) type liquid crystal display, GH (guest host) liquid crystal display and FL
The present invention relates to a C (ferroelectric liquid crystal) type color liquid crystal display device and a color filter used for the same.

[0002]

2. Description of the Related Art Conventionally, for color filters having primary color complementary color pigments (cyan, magenta, yellow (hereinafter referred to as complementary color pigments)), organic natural products (gelatin, casein, etc.) are purified to obtain low molecular weight compounds. There is a method of patterning the decomposed product (10,000 to 50,000) and dyeing a dye having a complementary color dye.

On the other hand, as a method for producing a color filter using a material in which a pigment is dispersed in a resin, a color filter containing a polyimide resin as a main component (Japanese Patent Laid-Open No. 60-2374) is used.
No. 03).

A color filter having a complementary colorant is known as a dye type. Although this color filter has a high transmittance, it is inferior in various characteristics such as solvent resistance, light resistance and heat resistance. When used as a color filter for a CCD for a scanner, a color copy or the like, or a color filter for a liquid crystal display device, there is a problem that it cannot endure long-time light irradiation and high heat.

On the other hand, a color filter using a material in which a pigment is dispersed in a resin is excellent in various characteristics such as solvent resistance, light resistance, and heat resistance, but is mainly of primary color type (red, green, blue). However, there is a problem in that it cannot be applied when a color filter having a complementary color dye is required.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and its problems are high transmittance, solvent resistance, light resistance, and heat resistance. It is intended to obtain a complementary color type color filter which is excellent in various characteristics and can be used for liquid crystal display devices.

[0007]

In order to solve this problem, the present invention provides a color filter in which a color filter layer containing a pigment, a dispersant and a resin as main components is provided on a substrate or a film or a solid-state image pickup device. In the above, the pigment is composed of a complementary colorant, and the product of the film thickness of the color filter layer and the total weight% of the pigment and the dispersant in the color filter layer is 60.
Provided is a color filter characterized in that it is not more than μm%, preferably not more than 55 μm% and not less than 40 μm%.

Further, a color filter layer containing a pigment, a dispersant, and a resin as main components and a transparent conductive film are provided between opposing substrates.
In a liquid crystal display device in which a liquid crystal is provided and a polarizing film is provided outside the substrate, the pigment is composed of a complementary color system dye,
Provided is a liquid crystal display device, wherein the product of the film thickness of the color filter layer and the total weight% of the pigment and the dispersant in the color filter layer is 60 μm% or less, preferably 55 μm% or less, 40 μm% or more. It is a thing.

Further, in these, the transmittance of the cyan color filter layer is 85 at 450 to 510 nm.
% Or more and 25% or less at 620 to 650 nm,
Desirably 50% transmittance, 580 ± 5 nm, 630 nm
Has a transmittance of 20 ± 5%, and the transmittance of the magenta color filter layer is 70% at 410 to 450 nm.
90% or more at 630 to 700 nm, 530
25% or less at 560 nm, preferably 495 ± 5 nm on the short wavelength side at 50% transmittance, 560 ± 5 nm on the long wavelength side at 20 ± 5% at 540 nm, and the transmittance of the yellow color filter layer is 430 to 430 nm.
20% or less at 460 nm, 85% or more at 550 to 700 nm, preferably 10 at 430 nm.
Provided is a color filter or a liquid crystal display device, which is 485 ± 5 nm at ± 5% and a transmittance of 50%.

The present invention will be described in detail below. In the present invention, the film thickness for forming a color filter layer for color separation is reduced to, for example, about 0.8 μm, or the addition amount of a pigment in a pigment dispersion coloring composition used for forming a color filter layer. By providing a solid-state image pickup device having high lightness, a liquid crystal display device, and a color filter used for the same, a color filter layer for color separation having a high transmittance characteristic is manufactured by reducing the amount.

At this time, regardless of the film thickness of the color separation color filter layer, if the amount of pigment per unit area corresponding to the amount of transmitted light is appropriately adjusted, the pigment concentration in the resin is not changed. The pigment may have a thin film thickness, the pigment concentration may be thinned without changing the film thickness, or both may be appropriately adjusted.

By adjusting the film thickness of each of the complementary color dyes cyan, magenta and yellow forming the color filter for color separation, or by using a photosensitive coloring composition in which the amount of pigment added is reduced. , To solve the problem. The color filter layer used there is formed of a pigment dispersion containing a solvent, and the following materials are appropriately used for the pigment dispersion used therein and the method for producing the same.

An example of the method of manufacturing the color filter layer according to the present invention will be described below. 3 to 5 from among alkyl acrylates or alkyl methacrylates such as acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, cyclic acrylates or methacrylates, hydroxyethyl acrylate or methacrylates
Approximately 5,000 to 10 molecular weight using various types of monomers
The acrylic resin synthesized to about 10,000 and the pigment are well mixed and kneaded using a two-roll mill to form chips. Then, the chip is dissolved using a dispersant and a solvent to prepare a paste.

As a pigment composed of a complementary colorant used in the present invention, as a magenta color (Mg), permanent carmine FBB-02 (C.IPigRed14) is used.
6), Shinkasha Red BRT-796D (C.IPi
gViolet19), Chromophtal red BRN
(C.IPigRed 144), Hosta Palm Pink E
(C.IPigRed146), or chromophthal red A2B (C.IPigRed177), Fanal
PinkD4680 (C.I. PigRED169),
Fanal Pink D4810 (C.IPigRED1
69), or FanelPink 4830 (C.IP.
igRED81).

As cyan color (Cy), heliogen blue D-7565 (C.IPigBlue16) or heliogen blue L6700F (C.IPigBlue)
e15: 6), HeliogenBlueD7072D
(C. IPigBlue 15: 3), Heliogen
BlueD6900D (C.IPigBlue15:
1), HeliogenBlueD6870D (C.I.
PigBlue 15: 2), or Heliogen
BlueD7100D (C.IPigBlue15:
4) etc.

As the yellow color (Ye), Nova Palm Yellow HR-01 (C.I Pig Yellow 8)
3), Pariotor Yellow K-0961HD (C.I.
PigYellow 138), or Pariotor Yellow L1820 (C.I PigYellow 139),
Lugen YellowD0790 (C.IPig
Yellow101), SicoYellowD095
1 (C.IPigYellow3), SicoYell
owD1150 (C.IPigYellow74), S
ecoFastYellowD1250 (C.IPig
Yellow1), SicoFastYellowD1
350 (C.IPigYellow13), SicoF
astYellowNB-D1760 (C.IPigY
yellow83), or SicominYellow
D1120 (C.I Pig Yellow 34) and the like.

As the dispersant, a wide range of dispersants such as surfactants, intermediates of pigments, intermediates of dyes and sol-spars are used. The composition ratio at the time of dispersion is not particularly limited, but the addition amount of the pigment to the acrylic resin for dispersion is about 50 to 150 parts by weight, and the dispersant is 1% by weight of the pigment.
It is about 10 parts by weight. Further, for the spectral adjustment of the color filter, two or three arbitrary pigments are mixed and adjusted.

[0018]

As described above, the color filter using the complementary colorant of the present invention can reduce the amount of pigment with respect to the amount of transmitted light of the color filter layer, can increase the brightness, and can increase the lightness other than the required wavelength. It has become possible to reduce the transmittance below the required performance.

As a result, since the transmittance of the cyan color filter layer is 85% or more in the range of 450 to 510 nm, the brightness of the cyan color filter layer is improved and the quality is improved. Furthermore, since the transmittance of the cyan color filter layer at other wavelengths can be lowered to 620 to 650 nm, a large contrast can be obtained.

Further, the transmittance of the magenta color filter layer is 70% or more at 410 to 450 nm, and 630 to 630.
Since it is 90% or more at 700 nm, the brightness of the magenta color filter layer is improved and the quality is improved. Furthermore, since the transmittance of the magenta color filter layer at other wavelengths can be lowered to 530 to 560 nm, a large contrast can be obtained.

Further, since the transmittance of the yellow color filter layer is 85% or more in the range of 550 to 700 nm, the brightness of the yellow color filter layer is improved and the quality is improved. Furthermore, since the transmittance of the yellow color filter layer at other wavelengths can be lowered to 430 to 460 nm, a large contrast can be obtained.

When a color filter layer of a complementary color pigment is provided on the substrate, the film, or the solid-state image sensor, the transmittance of the cyan color filter layer is 450 to 450.
85% or more at 510 nm and 25% or less at 620 to 650 nm, and the transmittance of the magenta color filter layer is 70% or more at 410 to 450 nm, 6
90% or more at 30 to 700 nm, 530 to 560
Since the transmittance of the yellow color filter layer is 25% or less, the transmittance of the yellow color filter layer is 20% or less at 430 to 460 nm, and the transmittance is 85% or more at 550 to 700 nm, all the color characteristics are satisfactory. It was

[0023]

EXAMPLE A method of forming a color filter having three colors of a cyan color filter layer, a magenta color filter layer and a yellow color filter layer on a glass substrate according to the present invention will be described.

Example 1 (A) Preparation of Photosensitive Coloring Composition Acrylic resin (20 parts of methacrylic acid, 10 parts of methyl methacrylate, 55 parts of butyl methacrylate, 15 parts of hydroxyethyl methacrylate and 30 parts of ethyl cellosolve 300)
g), 0.75 parts of azobisisobutylnitrile was added under a nitrogen atmosphere, and the acrylic resin obtained by the reaction at 70 ° C. for 5 hours was diluted with ethyl cellosolve to a resin concentration of 10%.

To 90.1 g of this diluted resin, 9.0 g of a pigment and 0.9 g of a dispersant were added and sufficiently kneaded with a three-roll mill to prepare cyan, magenta and yellow colored resins.

(Cyan Coloring Resin) Pigment Heliogen Blue D-7565 (Pig. Bl)
ue16)

(Magenta Coloring Resin) Pigment Hosta Palm Pink E (Pig.Red122)

(Yellow Coloring Resin) Pigment Pariotor Yellow K-0961HD (Pi
g. (Yellow138)

(B) To 100 g of each coloring composition, 5.64 g of trimethylolpropane triacrylate (photocurable monomer), 1.13 g of photopolymerization initiator diethylaminobenzophenone and 2,2'-bis (2-chlorophenyl) -4,4 ', 5,5'-tetraphenyl-1,2-
Bi (1-H-imidazole) 0.56 g and ethyl cellosolve 18.9 g were added and well stirred to obtain a photosensitive coloring composition.

(C) Fabrication of color filter (FIGS. 1 and 2)
Reference) First, the cyan photosensitive coloring composition 2 was spin-coated (3000 rpm, 10 sec) on the glass substrate 1 and dried. After prebaking at 70 ° C. for 20 minutes, polyvinyl alcohol 5% solution 3 was coated to form an oxygen barrier film. 70
After drying at 20 ° C. for 20 minutes, it was exposed (5 mJ / cm ² ) using a predetermined mask 4 as shown in FIG. 2, developed with a 2.5% sodium carbonate aqueous solution, and then thoroughly washed with water. The pigment adhering to the substrate was removed by rubbing with a soft sponge, washed with water, dried and baked at 230 ° C. for 1 hour to form a pattern. Color filters were obtained in the same manner for magenta and yellow (see spectral curve FIG. 3). The exposure amount for each color was 5 (mJ / cm ² ) for each of magenta and yellow. If necessary, an overcoat material was coated on the color filter and dried at 230 ° C. for 120 minutes to form an overcoat layer.

As a result, the thickness of the color filter layer is 0.
81 μm, in which the total weight% of the pigment and dispersant is
Is 54.6%, and the product is 44.2 μm%,
The spectrum becomes good as shown in FIG.

Example 2 A transparent conductive film 6 having a film thickness of 1500 angstrom was provided on the color filter prepared in Example 1 by a low temperature sputtering method, and then polyimide 7 was formed on the transparent conductive film to a film thickness of 400 angstrom. It was formed and subjected to a rubbing treatment. After that, the thin film transistor of the counter electrode 11 on the counter substrate 10 provided with the protective film 8 and a sealing agent (not shown) were partially attached to each other to assemble. Next, a liquid crystal cell is assembled by injecting the liquid crystal 12 between the electrodes and bonding the polarizing plates 13 and 14 to the outside, and a color liquid crystal display device having a color filter layer having high transmittance inside the liquid crystal cell as shown in FIG. Was obtained.

Comparative Example 1 (A) Preparation of color filter (see FIGS. 4 and 5) A photosensitive resin 5 to be dyed, which is a low molecular weight gelatin or protein such as casein to which a chromium compound is added, Alternatively, the solid-state imaging device 1 smoothed with a polyimide resin or the like was coated with 0.5 μm and dried. After prebaking at 60 ° C./60 minutes, exposure using a predetermined mask 4 (200 m
J / cm ² ) and then post-baked at 110 ° C./60 minutes to form a pattern. Next, after being immersed in an aqueous solution of Procion Turquoise HA (manufactured by CIC) to obtain a cyan color spectral curve as shown in FIG. 4, post-baking at 110 ° C./60 minutes was carried out to carry out dye-proof treatment. Color filters were obtained in the same manner for yellow and magenta. If necessary, an intermediate layer may be formed between the colors to further improve the dye-proof effect. An overcoat layer was formed on the color filter as needed.

Comparative Example 2 A transparent conductive film 6 having a film thickness of 1500 angstrom is provided on the color filter prepared in Comparative Example 1 by a low temperature sputtering method, and then polyimide 7 is formed on the transparent conductive film with a film thickness of 400 angstrom. It was formed and subjected to a rubbing treatment. After that, a thin film transistor of the counter electrode 10 on the counter substrate 9 provided with the protective film 8 and a sealing agent (not shown) were partially attached to each other to assemble. Next, the liquid crystal 11 is injected between the electrodes, and the polarizing plates 12 and 13 are attached to the outside to assemble a liquid crystal cell,
A color liquid crystal display device having a color filter layer having a transmittance as shown in FIG. 6 inside a liquid crystal cell was obtained.

[0035]

The present invention is a pigment dispersion type color filter having a complementary colorant having a high transmittance. The color characteristics of the color filter layer are composed of three colors, cyan, magenta, and yellow, and the transmission area is cut to 1/3 of all colors. Conventional liquid crystal displays have not been particularly required for screen brightness. However, in liquid crystal displays such as rough top computers and large TVs,
It was necessary to brighten the screen and improve the display characteristics. To this end, we have responded by improving the backlight, polarizing film, and liquid crystal. However, since the screen cannot be made sufficiently bright, a color filter for color separation having high transmittance is required. In addition, since color reproducibility is particularly required for color filters for color separation such as color copying, a dyeing type color filter having high lightness has been used although the durability is poor.

In order to provide a complementary color filter having high resistance, high transmittance, and excellent color reproducibility, the present inventors have used a complementary color pigment to further adjust the addition amount of the pigment.
Alternatively, it is achieved by adjusting the film thickness of the color filter layer.

[0037]

[Brief description of drawings]

FIG. 1 is a manufacturing process of a color filter using the resin of the present invention.

FIG. 2 is a cross-sectional view of a color filter manufacturing process using the resin of the present invention.

FIG. 3 is a spectrum of a color filter using the resin of the present invention.

FIG. 4 is a color filter manufacturing process using a conventional resin.

FIG. 5 is a cross-sectional view of a conventional color filter manufacturing process.

FIG. 6 is a spectrum of a color filter using a conventional dye.

FIG. 7 is a cross-sectional view of a liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Substrate 2 ... Photosensitive coloring resin 3 ... Oxygen blocking film 4 ... Mask 5 ... Color filter 6 ... Transparent electrode 7 ... Alignment film 8 ... Alignment film 9 ... Counter substrate 10 ... Counter electrode 11 ... Liquid crystal 12 ... Polarizing plate 13 ... Polarizing plate Cy ... Cyan color filter layer Mg ... Magenta color filter layer Ye ... Yellow color filter layer

Claims (6)

[Claims] 1. A color filter comprising a transparent glass substrate or a transparent film and a color filter layer containing a pigment, a dispersant and a resin as main components, wherein the pigment comprises yellow, magenta and cyan. A color filter, wherein the product of the layer thickness and the total weight% of the pigment and the dispersant in the color filter layer is 60 μm% or less. 2. A color filter in which a color filter layer containing a pigment, a dispersant, and a resin as a main component is provided on a solid-state image sensor, and the pigment is composed of yellow, magenta, and cyan, and the film thickness of the color filter layer. And the total weight% product of the pigment and the dispersant in the color filter layer is 60 μm% or less. 3. A liquid crystal display device in which a color filter layer containing a pigment, a dispersant, and a resin as main components, a transparent conductive film, and a liquid crystal are provided between opposed substrates, and a polarizing film is provided outside the substrate. A liquid crystal display device, wherein the pigment is composed of yellow, magenta, and cyan, and a product of a film thickness of the color filter layer and a total weight% of the pigment and the dispersant in the color filter layer is 60 μm% or less. 4. A color filter in which a color filter layer containing a pigment, a dispersant, and a resin as main components is provided on a substrate or a film, and the pigment is composed of yellow, magenta, and cyan. The transmittance is 85% or more at 450 to 510 nm, 620
25% or less at 650 nm, the transmittance of the magenta color filter layer is 70% or more at 410 to 450 nm, 90% or more at 630 to 700 nm,
25% or less at 530 to 560 nm, the transmittance of the yellow color filter layer is 20% or less at 430 to 460 nm, and 85% at 550 to 700 nm.
It is above, The color filter of Claim 1 characterized by the above-mentioned. 5. A color filter in which a color filter layer containing a pigment, a dispersant, and a resin as a main component is provided on a solid-state imaging device, and the pigment is composed of yellow, magenta, and cyan, and a color filter layer of cyan is used. Transmittance is 4
85% or more at 50 to 510 nm 620 to 650n
m is 25% or less, the transmittance of the magenta color filter layer is 70% or more at 410 to 450 nm, 90% or more at 630 to 700 nm, 530 to 530
3. The color filter according to claim 2, wherein the color filter has a transmittance of 25% or less at 560 nm, a yellow color and a transmittance of the filter layer of 20% or less at 430 to 460 nm and 85% or more at 550 to 700 nm. 6. A liquid crystal display device in which a color filter layer containing a pigment, a dispersant, and a resin as main components, a transparent conductive film, and a liquid crystal are provided between opposed substrates, and a polarizing film is provided outside the substrates. The pigment is composed of yellow, magenta, and cyan, and the transmittance of the cyan color filter layer is 45.
85% or more at 0 to 510 nm, 620 to 650 n
m is 25% or less, the transmittance of the magenta color filter layer is 70% or more at 410 to 450 nm, 90% or more at 630 to 700 nm, 530 to 530
It is 25% or less at 560 nm, and the transmittance of the yellow color filter layer is 2 at 430 to 460 nm.
4. The liquid crystal display device according to claim 3, which is 0% or less and 85% or more at 550 to 700 nm.