JPH10104599A - Colored resin composition for forming light shielding film, array substrate element and liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compsn. having the light shieldability and electrical insulation characteristic suitable for forming black matrices on the array substrate side of a liquid crystal display device in particular by using a pseudo-blackened org. pigment mixed of colors consisting of a combination of specific org. pigments and polyimide or polyimide precursors as essential components. SOLUTION: This resin compsn. consists essentially of the pseudo-blackened org. pigment mixed of colors consisting of the combinations of the org. pigments of respective colors yellow, blue and purple, having light transparency in a visible light region or the combinations of the org. pigments of respective colors yellow, red and blue, and the polyimide or polyimide precursors. The liquid crystal display device has the structure obtd. by holding liquid crystals LC between the array substrate element A and a color filter substrate element B and holding the outer side thereof with polarizing plates P1, P2. The array substrate element A consists of an array substrate 1, a gate insulating film 2, electrodes 3a for driving liquid crystals, the black matrices 4, etc. The black matrices 4 of the array substrate element A consist of this resin compsn.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin which is particularly suitable for forming a black matrix of an array substrate of a liquid crystal display device, and which is a colored resin for forming a light-shielding film having high insulation and high light-shielding properties. The present invention relates to a composition, a method of forming a black matrix pattern using the composition, and an array substrate element and a liquid crystal display device using the composition.

[0002]

2. Description of the Related Art In recent years, the demand for liquid crystal display devices capable of full color display has been expanding, and accordingly, it has been general to lower the price, increase the area, and further enhance the quality of liquid crystal display devices. It is strongly requested. In the case of devices such as word processors, personal computers, and portable televisions equipped with a liquid crystal display device, developments are being made from the viewpoint of reducing power consumption. On the other hand, it is required to improve not only the display performance but also the power consumption efficiency.

By the way, most of the power for driving the liquid crystal display device is consumed by the backlight. Therefore, in order to improve the power consumption efficiency of the liquid crystal display device, how to effectively use the light from the backlight. This is the point of development.

Conventionally, from such a point, attempts have been made to improve the color transmittance and the aperture ratio in order to improve the effective use of light in the color filter. In the case of a color filter, formation of a black matrix is indispensable for improving display performance. However, it is known that thinning of the black matrix is effective for improving the aperture ratio.

However, the black matrix on the color filter side needs to be formed in consideration of the positioning accuracy with respect to the counter electrode, so that it is impossible to sufficiently reduce the line width, and as a result, the aperture ratio is sufficiently improved. At present it is not possible.

As a method for solving this problem, there has been proposed a method of forming a black matrix on the array substrate side (Japanese Patent Laid-Open No. 6-130218). In this method, as a light shielding material for forming a black matrix, at least two or more of three kinds of color filter forming resists of red (R), green (G) and blue (B) are mixed to form a pseudo blackened resist. A mixture is used, or a black resist in which conductive carbon black is dispersed as a black pigment (JP-A-4-190362, JP-A-4-13106) is used.

[0007]

However, when a light-transmitting color filter-forming resist mixture which has been turned into a pseudo-black color is used as a light shielding material for forming a black matrix, red (R), green (G), and blue (B) In the case of mixing two or more of the three types, the light-shielding property at a specific wavelength is sufficient in the visible light region due to the spectral characteristics of each color, but the light-shielding property over the entire visible light region is insufficient. There was a problem. For this reason, the light shielding property must be increased by increasing the film thickness, and the image quality is degraded.
In addition, when a black resist in which conductive carbon black is dispersed as a black pigment is used, the conductivity of the resist is too high, and the electrodes are short-circuited. As a result, the image quality is deteriorated, and the liquid crystal is sometimes driven. There was a problem of not doing.

An object of the present invention is to solve the above-mentioned problems of the prior art. In particular, the present invention has a light-shielding property and an electric insulating property suitable for forming a black matrix on an array substrate side of a liquid crystal display device. An object of the present invention is to provide a colored resin composition for forming a light-shielding film, an array substrate element on which a black matrix is formed using the same, and a liquid crystal display device using the same.

[0009]

In order to solve this problem, the present inventor has proposed a combination of organic pigments of yellow, blue, and violet having light transmittance in a visible light region, or a combination of organic pigments of yellow, red, and blue. Provided is a colored resin composition for forming a light-shielding film, which comprises a pseudo-black mixed organic pigment composed of a combination of organic pigments and polyimide or a polyimide precursor as main components.

The mixed color organic pigment may be a mixture of yellow, blue and purple in a range of 1: 1: 1-1: 2: 2: 1 or a mixture of yellow, red and blue in a ratio of 1: 1: 1-1. 1: 2: 2, a specific resistance value of 10 ¹⁴ Ω · cm or more, and an optical density (OD) = − log (Y / 100) (where Y is A colored resin composition for forming a light-shielding film, wherein an optical density (OD) defined by a chromaticity value with a C light source) is 2 or more.

The mixed color organic pigment preferably further contains 1 to 30 parts by weight of carbon black, the specific resistance is 10 ¹² Ω · cm or more, and the optical density (OD) is
Is not less than 2.5, and a colored resin composition for forming a light-shielding film is provided.

Further, the present invention provides an array substrate for a liquid crystal display device in which a liquid crystal driving electrode is provided on a support. Provided are an array substrate element having a black matrix pattern formed of a resin composition, and a liquid crystal display device using the same.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the colored resin composition for forming a light-shielding film of the present invention will be described in detail. The colored resin composition for forming a light-shielding film of the present invention comprises a polyimide, preferably a polyimide precursor, a pigment as a main component, and a dispersant and a solvent that are derivatives of an organic pigment. Among the organic pigments having a light transmittance of 400 to 700 nm), the use of a yellow pigment, a combination of a blue pigment and a purple pigment, or a pseudo-black mixed color organic pigment composed of a combination of a yellow pigment, a red pigment and a blue pigment is considered. Features. As described above, when a black color is combined with a specific color of organic pigment, the chromaticity coordinate value becomes a value near the center of the C light source, so that a flat light shielding property can be realized in the visible light region.

In the colored resin composition for forming a light-shielding film of the present invention, when a mixture of an organic yellow pigment, a blue pigment and a violet pigment is made to be pseudo-black, the mixing ratio of each pigment is determined by the chromaticity coordinate value of the C light source. The ratio is preferably from 1: 1: 1 to 2: 2: 1, and particularly preferably from 1: 1: 1 to 1.3: 1.3: 1, so as to be located closer to the center of. In the case where a yellow pigment, a red pigment, and a blue pigment are mixed to form a pseudo black color, the ratio of each pigment is preferably from 1: 1: 1 to 1: 1.
1: 2: 2, particularly preferably 1: 1: 1-1: 1:
1.5: 1.5.

Further, in the colored resin composition for forming a light-shielding film of the present invention, the specific resistance value is 10 ¹⁴ Ω · cm or more, and OD = −log (Y / 100) (where Y is a C light source) Is the chromaticity value of.)
It is preferable that the optical density (OD) indicating the light-shielding property in the visible light region is 2 or more in terms of obtaining high contrast in the liquid crystal display device.

Here, the optical density (OD) in the ordinary sense
Is a numerical value calculated by substituting Y in the above formula for the transmittance T at a visible light wavelength of 550 nm. Since this value can represent only the OD at a specific wavelength (550 nm), the light shielding property over the entire visible light region is obtained. This is inconvenient when it is necessary to indicate Therefore, in the present invention, the optical density (OD) is calculated using the chromaticity value Y in order to indicate the light-shielding property in the entire visible light wavelength range, and represents the true light-shielding property in the visible light region.

In order to further improve the light-shielding properties of the colored resin composition for forming a light-shielding film of the present invention, it is preferable to include carbon black as a black pigment. In this case, it is preferable to use carbon black in an amount of 1 to 30 parts by weight, more preferably 5 to 20 parts by weight, based on 100 parts by weight of the mixed color organic pigment. Thereby, the optical density (OD) can be maintained at least 2.5 while maintaining the specific resistance value of the colored resin composition for forming a light-shielding film at 10 ¹² Ω · cm or more. Here, if the amount of carbon black is less than 1 part by weight, a sufficient effect of addition cannot be obtained. If the amount is 30 parts by weight or more, a high light-shielding property can be obtained, but the specific resistance value is 10 ¹¹ Ω · cm. It is not preferable because it becomes a conductor below or completely, and when a black matrix is formed on the array substrate, a short circuit between electrodes may occur.

Since the colored resin composition for forming a light-shielding film of the present invention is not photosensitive, it is necessary to use a positive resist when forming a black matrix. Although the number of forming steps increases compared to the resist type with photosensitivity, the patterning accuracy of the black matrix is improved by developing and etching using a positive resist with excellent patterning characteristics such as resolution and line width accuracy. Can be done.

Next, specific examples of each component used in the colored resin composition for forming a light-shielding film of the present invention will be shown. As the yellow pigment used for the mixed color organic pigment, Nova Palm Yellow HR is used.
-01 (CI Pig Yellow 83), Paliotole Yellow K-0961HD (CI Pig Yellow)
Yellow 138), Palio Tol Yellow L18
20 (CI Pig Yellow 139), Lu
mogen Yellow D 0790 (CI Pi
g Yellow 101), Sico Yellow
D 0951 (CI Pig Yellow)
3), Silicon Yellow D 1150 (C.I.
I. Pig Yellow 74), Silicon Fas
t Yellow D 1250 (CI Pig Y
yellow 1) 、 Sico Fast Yellow
D 1350 (CI Pig Yellow 1
3), Silicon Fast Yellow NB-D
1760 (CI Pig Yellow 83), S
iconin Yellow D 1120 (CI.
Pig Yellow 34) and the like.

Examples of the red pigment include permanent carmine FBB-02 (CI Pig Red 146) and Shinkasha Red BRT-796D (CI Pig V).
iolet 19), Chromophthal Red BRN (C.I.
I. Pig 144), Hosta Palm Pink E (C.I.
I. Pig Red 146), Chromophthal Red A
2B (CI Pig Red 177), Fanal
Pink D 4680 (CI Pig Red)
169), Fanal Pink D4810 (C.I.
I. Pig Red 169), Fanal Pink
4830 (CI Pig Red 81) and the like.

As a blue pigment, Heliogen Blue D-
7565 (CI Pig Blue 16), Heliogen Blue L6700F (CI Pig Blue)
15: 6), Heliogen Blue D7072D (CI.
Pig Blue 15: 3), Heliogen Blue D6
900D (CI Pig Blue 15: 1), Heliogen Blue D6870D (CI Pig Blue)
e 15: 2), Heliogen Blue D7100D (C.I.
I. Pig Blue 15: 4).

As the purple pigment, Fanl Viole
t D5460 (CI PigViolet 14)
5175: 1), Fanal Violet D548
0 (CI Pig Violet 1 45170:
2), Fanl Violet D6060 (CI.
Pig Violet 39 42555: 2), Fa
nl Violet D6070 (CI Pig V
iolet39 42555: 2), lionogen violet RL (CI Pig Violet23 51).
319) and the like.

As the polyimide or the polyimide precursor used in the present invention, a polyimide precursor obtained by reacting tetracarboxylic anhydride and a diamine in a solvent, or a polyimide precursor obtained by imidizing a polyimide precursor as conventionally known. Resin can be used. From the viewpoint of heat resistance, a polyimide precursor is preferably used.

Examples of the above tetracarboxylic acid include pyromellitic acid or its dianhydride, 3,3 ', 4,4'-biphenyltetracarboxylic acid or its dianhydride, 2,3,
3 ', 4,4'-benzophenonetetracarboxylic acid or its dianhydride. Examples of the diamine include phenylenediamine, 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenylmethane, o
-Tolidine, o-dianisidine, 2,4-diaminotoluene, 1,4-bis (4-aminophenoxy) benzene, 3,5-diaminobenzoic acid, 4,4'-diamino-
Examples thereof include aromatic diamines such as 3-monoamide-diphenyl ether and diaminosiloxanes such as w, w'-bis- (3-aminopropyl) polydimethylsiloxane. As an example of the polyimide precursor co-used in the present invention,
Dupont: "Pyralin"
"PI Series", manufactured by Toray Industries: "Semico Fine"
"SP Series" and "Photo Nice", manufactured by Hitachi Chemical Co., Ltd .:
"PIQ series", "PIX series", Shin-Etsu Chemical Co., Ltd .: "KJR-651", Toshiba Chemical Corporation
Manufactured: “TVE5051” and the like.

Next, the preferred composition of each of the above components in the colored resin composition for forming a light-shielding film of the present invention will be described. The solid content of the colored resin composition for forming a light-shielding film (mixed pigment and polyimide or its precursor and other dispersants, etc.)
Even if it is too small or too large, it becomes difficult to form a desired thick film with a coating device such as spin coating and roll coating,
In addition, since the coating amount is reduced, it is preferably 5 to 40% by weight, more preferably 10 to 30% by weight, and still more preferably 15 to 20% by weight.

If the ratio of the mixed pigment obtained by mixing the pseudo-blackened mixed organic pigment and, if necessary, carbon black as the black pigment is too small, the light-shielding property of the black matrix is reduced, so that the ratio is too large. Thick film is required, as a result, hinders the formation of the liquid crystal alignment film, there is a possibility that the display performance as a liquid crystal display device is impaired,
On the other hand, if the amount is too large, it is difficult to uniformly disperse, and even if a light-shielding film is formed, mechanical strength such as adhesion may be reduced. Therefore, the polyimide or its precursor 100
It is preferably 50 to 200 parts by weight with respect to parts by weight,
More preferably, it is 100 to 150 parts by weight.

The colored resin composition for forming a light-shielding film of the present invention thus obtained is very useful as a material for forming a black matrix provided on an array substrate of a color liquid crystal display device. FIG. 1 shows an example in which a black matrix is provided on an array substrate.

FIG. 1 is a sectional view of a liquid crystal display device. This liquid crystal display device has a structure in which liquid crystal LC is sandwiched between an array substrate element A and a color filter substrate element B, and the outside thereof is sandwiched between polarizing plates P1 and P2.

Here, the array substrate element A comprises an array substrate 1, a gate insulating film 2 formed on one surface thereof, a liquid crystal driving electrode 3a and a black matrix 4 formed thereon, and And an alignment film 5a provided. The color filter substrate element B
Is a light-transmitting substrate 6, color filters 7 of R, G, and B colors formed on one surface thereof, and a liquid crystal driving electrode 3b.
And an alignment film 5b formed thereon.

This liquid crystal display device (array substrate element)
The black matrix 4 is formed from the colored resin composition for forming a light-shielding film of the present invention. Therefore,
This black matrix 4 has a high specific resistance value (10 ¹⁴ Ω ·
cm or more) and a high optical density (OD ≧ 2), and a high aperture ratio can be realized. Therefore, in an array substrate element having a black matrix formed from the colored resin composition for forming a light-shielding film of the present invention, and further in a liquid crystal display device using the same, it is possible to improve the light utilization rate of the backlight. The display quality can be improved. The other components of the array substrate element and the liquid crystal display device shown in FIG. 1 can have the same configurations as those of the conventional array substrate element and the liquid crystal display device.

[0031]

【Example】

<Example 1> 100 parts by weight of a polyimide precursor (manufactured by Toray Industries, Inc .: "Semico Fine SP-510"), NMP20
0 parts by weight, yellow pigment (manufactured by BASF: "Pariotol Yellow L1820" (CI Pig Yellow)
139)) 46.5 g, blue pigment (manufactured by BASF: "Heliogen Blue L6700F") 36 g, purple pigment (manufactured by Toyo Ink Mfg. Co., Ltd .: "Lionogen Violet R"
L ") 36 g, and a dispersant (copper phthalocyanine derivative)
10 g was added and dispersed for 3 hours while cooling with a bead mill disperser. This colored resin was diluted with NMP to a solid content of 15% by weight as a solvent and stirred well to prepare a colored resin composition for forming a light-shielding film.

This colored resin composition for forming a light-shielding film was spin-coated at 800 (rpm) on one surface of a substrate on which both surfaces of Cr were deposited, to obtain a coating film having a thickness of 1.2 μm. After the coating film was dried, the end face was wiped off with acetone, and further baked at 250 ° C. for 1 hour. Then, both sides of Cr were short-circuited with a silver paste to obtain a substrate for specific resistance measurement. The specific resistance of this substrate was measured according to a measurement method according to a volume resistivity test of JIS standard (C2103-1991). As a result, the specific resistance was 10 ¹⁴ Ω · cm or more. Similarly, a light-shielding film was formed on a transparent glass substrate using the colored resin composition for forming a light-shielding film of this example, and the transparency thereof was measured. As a result, the optical density (OD) was 2.17 (chromaticity value (Y) = 0.67).
Met. FIG. 2 shows an absorbance characteristic diagram with respect to the wavelength of the light-shielding film. From FIG. 2, it can be seen that the film is flat over the entire visible region, has high absorption, and exhibits good light-shielding properties. FIG. 3 shows a chromaticity coordinate diagram of the light-shielding film. From FIG. 3, it can be seen that the chromaticity value exists near the center of the C light source (the position of “x” in the figure).

Next, the colored resin composition for forming a light-shielding film of this embodiment, which was confirmed to have sufficient characteristics, was applied to an array substrate on which an electrode pattern had been formed, and a thickness of 1.2 μm was obtained.
m were obtained. After drying at 100 ° C. for 20 minutes, a positive resist (manufactured by Hoechst: “AZ1350”) is further added.
And dried at 100 ° C./20 minutes. Next, after the pixel portion is precisely aligned through a light-shielded mask, UV exposure (10 mJ / cm ² ) is performed, and the pixel portion is removed together with the light-shielding film using an “AZ developer” manufactured by Hoechst. It was developed and etched. Then at 130 ° C for 20
After baking for a minute, the peeling resistance of the light-shielding film was improved, and then the positive resist was peeled off with a 5% aqueous solution of caustic soda, followed by baking at 250 ° C. for 1 hour, thereby obtaining a black matrix pattern. The line width of this black matrix is high because the resolution of the positive resist is high.
It could be formed with a thickness of 5 μm or less. Further, the aperture ratio of the pixel electrode portion was almost 100%.

Further, when a liquid crystal display device was assembled using this array substrate according to a conventional method, the obtained liquid crystal display device had a higher aperture ratio than a conventional liquid crystal display device using a color filter in which a black matrix was formed. Was higher than 15%, and bright image display and high definition were possible.

<Example 2> As in Example 1, a yellow pigment (manufactured by BASF: "Pariotor Yellow L1") was used as an organic pigment.
820 "(CI Pig Yellow 13)
9;)) 36 g, red pigment (manufactured by Ciba Geigy: "Chromophthal Red A2B" (CI Pig Red 17)
7 65300)) 36 g, blue pigment (manufactured by BASF:
"Heliogen Blue L6700F") 46.5 g and 10 g of a dispersant were used, dispersed by a disperser in the same manner as in Example 1, and diluted to a solid content of 15% by weight using NMP as a solvent. By stirring well, a colored resin composition for forming a light-shielding film was prepared.

Using the colored resin composition for forming a light-shielding film,
When the specific resistance and the optical density were measured in the same manner as in Example 1, the specific resistance was 10 ¹⁴ Ω · cm or more, and the optical density (OD) was 2.06 (the chromaticity value (Y) = 0.86). )Met. FIG. 2 shows an absorbance characteristic diagram with respect to the wavelength of the light-shielding film. From FIG. 2, it can be seen that the film is flat over the entire visible region, has high absorption, and exhibits good light-shielding properties. FIG. 3 shows a chromaticity coordinate diagram of the light-shielding film. From FIG. 3, the center of the C light source (the position of “x” in the figure)
It can be seen that there is a chromaticity value in the vicinity.

Next, using the colored resin composition for forming a light-shielding film of this embodiment, a black matrix was formed on the array substrate in the same manner as in Example 1. The aperture ratio of the pixel electrode portion of the array substrate was almost 100%. It became. Further, when a liquid crystal display device is assembled using this array substrate, the aperture ratio is 15% or more higher than that of a conventional liquid crystal display device using a color filter in which a black matrix is formed, and a bright image display and high definition are realized. Was possible.

Example 3 In the same manner as in Example 1, a yellow pigment (manufactured by BASF: "Pariotor Yellow L1") was used as the organic pigment.
820 "(CI Pig Yellow 139))
38.5 g, blue pigment (manufactured by BASF: "Heliogen Blue L6700F") 30.5 g, purple pigment (Toyo Ink Mfg. Co., Ltd .: "Lionogen Violet RL") 3
0.5 g, carbon black 10.5 g and dispersant 11
g was dispersed in a dispersing machine in the same manner as in Example 1, diluted with NMP as a solvent to a solid content of 15% by weight, and stirred well to prepare a colored resin composition for forming a light-shielding film. .

Using this colored resin composition for forming a light-shielding film, the specific resistance and the optical density were measured in the same manner as in Example 1.
As a result, the specific resistance was 10 ¹² Ω · cm or more (film thickness 1.1 μm), and the optical density (OD) was 2.
82 (chromaticity value (Y) = 0.15). FIG. 2 shows an absorbance characteristic diagram with respect to the wavelength of the light-shielding film. FIG.
From the results, it can be seen that it is flat over the entire visible region, has high absorption, and shows good light shielding properties. FIG. 3 shows a chromaticity coordinate diagram of the light-shielding film. From FIG.
It can be seen that a chromaticity value exists near the center of the C light source (the position of “x” in the figure).

Next, using the colored resin composition for forming a light-shielding film of this embodiment, a black matrix was formed on the array substrate in the same manner as in Example 1. The aperture ratio of the pixel electrode portion of the array substrate was almost 100%. It became. Further, when a liquid crystal display device is assembled using this array substrate, the aperture ratio is 15% or more higher than that of a conventional liquid crystal display device using a color filter in which a black matrix is formed, and a bright image display and high definition are realized. Was possible. FIG. 2 shows an absorbance characteristic diagram with respect to the wavelength of the light-shielding film. From FIG.
It can be seen that there is flat and high absorption over the entire visible region, indicating good light-shielding properties.

Example 4 In the same manner as in Example 1, a yellow pigment (manufactured by BASF: "Paliotor Yellow L1") was used as the organic pigment.
820 "(CI Pig Yellow 139))
30.5 g, red pigment (manufactured by Ciba Geigy: "Chromophthal Red A2B" (CI Pig Red 177)
65300) 30.5 g, blue pigment (manufactured by BASF:
38.5 g of "Heliogen Blue L6700F", 10.5 g of carbon black and 11 g of a dispersant were prepared in Example 1.
In the same manner as in the above, the mixture was dispersed with a disperser, diluted with NMP as a solvent to a solid content of 15% by weight, and stirred well to prepare a colored resin composition for forming a light-shielding film.

Using this colored resin composition for forming a light-shielding film, the specific resistance and the optical density were measured in the same manner as in Example 1. The specific resistance was 10 ¹² Ω · cm or more. OD) was 2.68 (chromaticity value (Y) = 0.21). FIG. 2 shows an absorbance characteristic diagram with respect to the wavelength of the light-shielding film. From FIG. 2, it can be seen that the film is flat over the entire visible region, has high absorption, and exhibits good light-shielding properties. FIG. 3 shows a chromaticity coordinate diagram of the light-shielding film. From FIG. 3, the center of the C light source (the position of “x” in the figure)
It can be seen that there is a chromaticity value in the vicinity.

Next, when the black matrix was formed on the array substrate in the same manner as in Example 1 using the colored resin composition for forming a light-shielding film of this Example, the aperture ratio of the pixel electrode portion of the array substrate was almost 100%. It became. Further, when a liquid crystal display device is assembled using this array substrate, the aperture ratio is 15% or more higher than that of a conventional liquid crystal display device using a color filter in which a black matrix is formed, and a bright image display and high definition are realized. Was possible.

<Comparative Example 1> As in Example 1, a red pigment (manufactured by Ciba Geigy: "Chromophthal Red A") was used as the organic pigment.
2B "(CI Pig Red 177 6530)
0)) 35 g, 35 g of a blue pigment (BASF: "Heliogen Blue L6700F") and 7.5 g of a dispersant were dispersed in a disperser in the same manner as in Example 1, and a solid content of 15 was obtained using NMP as a solvent. The resulting mixture was diluted to a weight percentage and stirred well to prepare a colored resin composition for forming a light-shielding film.

Using this colored resin composition for forming a light-shielding film, the specific resistance and the optical density were measured in the same manner as in Example 1. The specific resistance was 10 ¹⁴ Ω · cm or more (thickness: 1.3 μm).
m). However, the optical density (OD) is 1.49.
(Chromaticity value (Y) = 3.23), and in order to obtain an optical density of 2 or more, the film thickness had to be 2 μm or more. Therefore, even when a black matrix is formed on an array substrate in the same manner as in Example 1 using the colored resin composition for forming a light-shielding film of this comparative example, the aperture ratio of the pixel electrode portion of the array substrate is set to 100%. In addition, the liquid crystal display device assembled using this array substrate had a problem in forming the alignment film, and was deteriorated as compared with the liquid crystal display device of the example.

FIG. 2 shows an absorbance characteristic diagram with respect to the wavelength of the obtained light-shielding film. From FIG. 2, it can be seen that the absorption on the low wavelength side is particularly small and the light-shielding property is insufficient. FIG. 3 shows a chromaticity coordinate diagram of the light-shielding film. From FIG.
It can be seen that a chromaticity value exists at a position distant from the center of the C light source (the position of “x” in the figure).

<Comparative Example 2> As in Example 1, the organic pigment was a red pigment ("Chromophthal Red A" manufactured by Ciba-Geigy).
2B "(CI Pig Red 177 6530)
0)) 30 g, a blue pigment (manufactured by BASF: "Heliogen Blue L6700F") 30 g, carbon black 18
g and 10 g of a dispersant were dispersed in a dispersing machine in the same manner as in Example 1, and diluted to a solid content of 15% by weight using NMP as a solvent, and thoroughly stirred to form a colored resin composition for forming a light-shielding film. Was prepared.

Using this colored resin composition for forming a light-shielding film, the specific resistance was measured in the same manner as in Example 1, and the specific resistance of the conductor was shown. Therefore, it was found that this colored resin composition for forming a light-shielding film could not be used as a material for a black matrix of a liquid crystal display device.

[0049]

The colored resin composition for forming a light-shielding film according to the present invention is a material for a black matrix formed on an array substrate and has excellent light-shielding properties and high insulation properties.
Therefore, a fine black matrix pattern with a small thickness can be formed on the array substrate from the colored resin composition for forming a light shielding film, and the aperture ratio of the array substrate can be improved. Further, by using this array substrate, it is possible to realize a liquid crystal display device in which the light utilization rate of the backlight is significantly improved and the power consumption is reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid crystal display device of the present invention.

FIG. 2 is an absorbance characteristic diagram of the light-shielding films of Examples 1 to 4 and Comparative Example 1.

FIG. 3 is a chromaticity coordinate characteristic diagram of Examples 1 to 4 and Comparative Example 1.

[Explanation of symbols]

 A: Array substrate element B: Color filter substrate element LC: Liquid crystal P1: P2: Polarizing plate 1: Array substrate 2: Gate insulating film 3a, 3b: Liquid crystal driving electrode 4: Black matrix 5a, 5b: Alignment film 6: Light Transparent substrate 7 ... Color filter

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mizunin Tani 1-5-1, Taito, Taito-ku, Tokyo Letterpress Printing Co., Ltd.

Claims (8)

[Claims] 1. A pseudo-black mixed color organic pigment comprising a combination of organic pigments of yellow, blue and purple or a combination of organic pigments of yellow, red and blue each having a light transmittance in a visible light region; A colored resin composition for forming a light-shielding film, comprising a polyimide or a polyimide precursor as a main component. 2. The color-mixed organic pigment has a yellow color, a blue color, and a purple color:
It is characterized by being mixed in the range of 1: 1 to 2: 2: 1 or of yellow, red and blue mixed in the range of 1: 1: 1-1: 2: 2. The colored resin composition for forming a light-shielding film according to claim 1. And in wherein resistivity is 10 ¹⁴ Ω · cm or more and an optical density (OD) = - log (Y / 100) ( in the formula, Y chromaticity value in the C light source) as defined in The colored resin composition for forming a light-shielding film according to claim 1 or 2, wherein the optical density (OD) is 2 or more. 4. The colored resin composition for forming a light-shielding film according to claim 1, wherein said mixed color organic pigment further contains carbon black. 5. The colored resin composition for forming a light-shielding film according to claim 4, wherein the content of carbon black is 1 to 30 parts by weight based on 100 parts by weight of the mixed color organic pigment. 6. The colored resin composition for forming a light-shielding film according to claim 4, wherein the specific resistance value is 10 ¹² Ω · cm or more and the optical density (OD) is 2.5 or more. Stuff. 7. A light-shielding film according to claim 1, wherein an array substrate element for a liquid crystal display device comprising a liquid crystal drive electrode provided on an array substrate is provided on a side surface of the liquid crystal drive electrode of the array substrate. An array substrate element, wherein a black matrix pattern is formed by the forming colored resin composition. 8. A liquid crystal display device using the array substrate element according to claim 7.