JPH02156202A - Production of color filter - Google Patents

Abstract

PURPOSE:To widen a color display range and to improve durability by previously forming black mask patterns on a transparent substrate, then spraying ink by an ink jet system to the prescribed points on the substrate, except in the patterned parts, thereby coloring the transparent parts. CONSTITUTION:The black mask patterns are formed in the non-display parts on at least one substrate of a pair of the transparent substrates consisting of glass, plastic, etc. The ink is sprayed by the ink jet system to the desired and prescribed points on the transparent, except in the black mask patterns formed in such a manner, by which the light transparent color patterns are formed. The advantage of the ink jet system in the production process is, therefore, effectively utilized and since there is no need for taking the special properties, such as wettability, of the ink and the transparent base body into consideration, the complexity of the combinations of the materials can be improved and the range for selecting the materials, such as ink materials, is widened. The broad selection is possible in properties, such as durability, of the film and the hues of the filters in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a method for manufacturing a color filter. More specifically, the non-display area of the transparent substrate is coated with a black mask pattern using jet ink in a predetermined pattern to form a slightly transparent injected color film. In particular, it relates to a method of manufacturing a color filter.

INDUSTRIAL APPLICATION This invention is suitably used for manufacture of the color filter for liquid crystal display devices. .

[Prior Art and Problems] Various methods have been devised for forming color filters for liquid crystal display cells, but in particular, methods for forming color filters by forming a colored translucent film on the inner wall side of the cell have been devised. , the following methods are known.

There is a horn method in which transparent colored ink is pattern-printed using a silk screen method or an offset printing method to form a color filter film, but there is a limit to the thickness of the printed pattern. It is not suitable for assembling color filters for high definition 11'l televisions, etc. Furthermore, in order to manufacture -174; i-color and multicolor filters, it is necessary to repeat the printing, drying and curing process as many times as the number of colors. D, production yield and cost information 5-1: Connect.

Also, the blue color is ultraviolet!
1.1' Nkwon J 1llll ), t.

Full body coating (11S, determined pattern: Therefore, ultraviolet rays: l, (j jJ, j l,, unnecessary 111S)
There is a method in which a portion corresponding to the color filter is left on the transparent substrate by cleaning for 9 hours. However, with this method, when creating color filters with only colors, -.times of ultraviolet irradiation and dissolution is sufficient; however, in order to create color filters with three primary colors such as red, j'1, and green, The process corresponding to the number of colors (coating, ultraviolet rays)
:j Q.1. (dissolution etching) must be performed.

Furthermore, using the same method, an ultraviolet curable transparent resin is applied to the transparent substrate-L, and after dissolving and etching unnecessary parts using an ultraviolet source Q=I according to a predetermined pattern, the transparent resin film is dyed with a dye. There is a way to do it. Even in this method, when manufacturing three-color color filters, in addition to repeating the second step of applying the amount of beads, ultraviolet irradiation, molten H + seed etching, and dyeing, when dyeing after two colors 1-1, In order to avoid mixed staining with the dyeing, it is necessary to cover the already dyed part with a non-dying protective film, making the production extremely complicated.

Alternatively, a method for manufacturing color filters using an electrodeposition coating method has been proposed (Japanese Patent Laid-Open No. 63-26648
2). In this method as well, a button with a transparent electrode is created in advance for the part to be painted with electricity, and when manufacturing three-color color filters, electricity is sequentially applied to the corresponding electrode, and the transparent electrode is applied. Form a color filter film, but in the case of three colors, the upper neck operation of the amount of beads is -4 stars.
In order to prevent color mixing due to the number 11 of 21 colors, operations such as heating and drying are required each time one color is electrodeposited to strengthen the film.

In addition, since a transparent electrode compatible with Japan and France is required to carry out electric ZIL culm, the shape of the electrode is limited, which may be inconvenient for the final liquid crystal display cell.

To solve these problems, it has been devised to use an inkjet method as a more streamlined color filter manufacturing method (Japanese Patent Laid-Open No. 59-75205
issue). In this method, when ink with good wettability is used on the glass substrate, in order to avoid color mixing between adjacent inks, a substance with poor wettability is applied to the glass substrate to avoid color mixing.
If you want to print a pattern on the glass or use ink that wets the glass, you can use a material that has good wettability with the ink to form a pattern on the glass in advance. A method has been proposed to help ink settle where it is intended.

This method has the basic advantage of requiring fewer printings (printing) compared to the conventional surface layer technology when mounting multicolor color filters; When using ink with good quality, the wettability with the ink;! ! Made of thick material and in contact with glass? ``One material with good properties! ! f′, l′, or when using an ink with poor quality due to χ・1 to the glass base, use a dye that has good adhesion to the glass and good 7:ja resistance with the ink. It is necessary to select a material with a constant i″T.

Carrying such a complex combination as a concrete ten-year fee is a special case, and there are also concrete examples in the ζ'' plan as well.
It has not been raised.

[5? ! The present invention utilizes the advantages of the manufacturing process using the Ishikjet method, and also improves the complexity of material combinations to create a coloring material (ink) for color filters. The purpose of this paper is to provide a method for manufacturing color filters that can be selected from a wide range of colors to expand the display range of colors and improve durability. It is an object of the present invention to provide a method for manufacturing a color filter which can be suitably used for the invention and which can significantly improve the performance of color liquid crystal display devices.

[Structure of the Invention] The method for manufacturing a color filter of the present invention is based on iM jlp
After forming a black mask pattern on the body L, ink is sprayed at a predetermined tX+ position of the substrate 1-1 other than the pattern using an inkjet method (J
It is characterized by forming a color pattern by coloring the transparent part.

Hereinafter, embodiments of the method for manufacturing a color filter of the present invention will be described.

First of all, the transparency of 1 and 2yj made of glass and plastic hats 81 (Less body pain, spider-...) j no 1 (body (
[1] The term "body" also includes a base body provided with an electrode layer.

) A black mask pattern (light-shielding film) is formed on the non-display 86 above. A black mask pattern may be created by printing black ink that forms an opaque black film using a printing method such as a silk screen method or an offset method.Alternatively, after developing the pattern using an ultraviolet curable resin, the area that will become the display area is printed. Alternatively, a method may be used in which solution etching is performed and the remaining transparent film is dyed with black dye. These selections are made depending on the desired fineness of the black mask, the translucency of the black, and other factors.

Furthermore, in order to improve the adhesion between the film forming the black mask and the transparent substrate, a thin transparent coating may be formed on the entire surface of the substrate. The thickness of the black mask film should be set to have optically sufficient light-shielding properties (at least 1.0 in optical density).
0 or more F), but 1 usually less than IOum, 1μ
m or more.

A light-transmissive color pattern is formed by spraying ink onto a desired predetermined location on the substrate other than the black mask pattern created in this manner using an inkjet method and coloring the transparent portion. The jet ink to be used can be an air-drying type or a baking type aqueous or non-aqueous jet ink that has been commonly used in the past, but in the present invention, it cures in a short time, Active energy ray-curable jet inks that do not require heat curing are particularly desirable from the viewpoint of shortening the manufacturing process of color filters and preventing deformation of color filters.

The properties of the active energy ray-curable jet ink are as disclosed in, for example, JP-A No. 62-64874, with a viscosity of 1-1-5 cps and a surface strength of 20-60.
It is desirable to have general physical property values such as dyne/cm2, specific resistance of 2.000 Ω-cm or more F, and ratio 1Jj of 0.8 to 1.2.

Note that the active energy ray curable ink is composed of active energy ray curable resins or oligomers, reactive diluents, dyes and pigments, and photoreaction initiators, as long as the physical properties are as specified in +iii. , plus a non-reactive diluent if necessary.

Ink containing additives etc. can be used.

This kind of active energy ray curable ink.

A color filter is completed by spraying the coating to a dry film thickness of about 1-10 um, preferably by an inkjet-lid method, and then curing with active energy rays to form a color film. At this time, each color ink has its own dedicated nozzle.
l'I Q-1, and the discharge status is inputted,
Tabekoon - completely controlled by old balls, this 7)
'5,'Q',, The i-rink droplet is transparent 2
; ↓ When the ink droplet is attached to a predetermined amount (1"l〆i?1) of the body, it spreads on the substrate, but as a feature of the inkjet method, the size of the ink droplet can be precisely controlled, so it can be formed into a dot pattern. Necessary and sufficient ink for λ・1: 11
Even if it extends a little, there is a black mask of a certain width at the border with other adjacent colors, so even if adjacent colors overlap with black mask - L, they cannot be distinguished as colors. Since it does not stick, there is no problem in practical use.

[Effects of the Invention] According to the method for producing a color filter of the present invention described above, the advantages of the production process l- by the inkjet method can be taken advantage of, and special properties such as the tangleability of the ink and the transparent substrate can be made use of. Since there is no need to take into account the complexity of material combinations, the range of selection of materials such as ink materials is expanded, making it possible to make a wide selection of properties such as the durability of the film and the hue of the filter. It becomes possible to create excellent color filters.

[Real IIi! i example 1 Below, we will briefly discuss embodiments of the present invention.

In addition, the example explained below uses a liquid crystal! (This is a color filter for water equipment, but is not limited to such uses.7 (Example 1) Finally, 1'i"i'('rt+in F i
In TransisLorl A compounding example for a transparent conductive 1-λ1・r glass substrate for creating a low-J liquid crystal display device! An ultraviolet curable resin solution having the composition of
(Formulation Example I) Bisphenol/epoxy-modified acrylate oligomer 83 parts Trimethylolpropane triacrylate 10 parts Z 2-diethoxyacetophenone 4.6 parts Diaminosilane coupling agent 24 parts: Volatized components Later, using a dot matrix color display mask, 436
Irradiate with ultraviolet light with a wavelength of 5 nm for 3 seconds Q-j L
, forming a latent image of a dot pattern. Then mix methyl ethyl ketone and methylene chloride? Dissolution etching is performed using 8 liquids, the resin dots are removed, and the pattern is developed. After that, the glass substrate was coated with solvent black 27.
% Methyl Ezyl Ketone solution for several minutes overnight, the dots formed on the glass substrate will dye the pattern.

However, later, ultraviolet curable jet ink (formulation example 2)
), spray coat each color onto the predetermined transparent portion of the dotted area of glass J (tentative T).

(Formulation Example 2) Urethane-modified acrylate oligomer 150 parts dipentaerythritol hexaacrylate 15 parts hensyl dimethyl ketal 10 parts 2-chlorothioxanthone: 3 parts sodium thiocyanate 4 parts methyl ethyl ketone
200 parts Dye* 10 parts (Red dye: Solventret 132) (I', Dye:
Solvent Blue-67) (Green dye: Solvent Yellow 8
9/Solvent Blue 67) The jet ink jetting Q-1 device used at this time was an IJ printer S type made by Rizakusho. Injection is controlled based on the received information. Furthermore, at the same time, the stage on which the glass substrate is placed moves in a direction opposite to the direction in which the ink ejecting head moves, thereby coating the substrate with gold and white (color ink).

After applying the predetermined number of colors, the device irradiated ultraviolet rays with +20 W/CM luminous energy (+ ultraviolet 11θq) for 5 seconds. As a result, the two-color ink image was intensified with the black mask as the boundary. There was no color mixing, resulting in an attractive liquid crystal color filter for dot display.

('i5 Example 2) (,'Hi+j (!111 tr+ii fA')
) -i', +'v l:: J5 ite, 4111
] '+'J 41
It metal t' night (manufactured by Tokyo Ohka Kogyo t+ 11: D
About 0.37 parts m of the oxidized Ii' element is removed from -8[1 fl El l by heating /li and calcining. After forming a silicon oxide pattern on the surface of the substrate, UV curing (1'! resin solution (formulation example)) is applied.

1. Make a bra/tsuku mask in the same way as in Example 1! i
’:, I harvested two wheat, UV curing! The baby color ink is injected into the specified transparent 111S by a jet ink jet 9.l device.
Apply IJ-1 ultraviolet to the fountain 1. ? A color filter was prepared by preparing 1.1:1.1 blue.

As in Example 1, the color filter produced by 111 did not show any color mixing in the three-color ink film with the black mask as the boundary, resulting in a good one-night color filter for dot display. The density of the film was also good (7'1).

Claims (2)

[Claims] (1) After forming a black mask pattern on a transparent substrate in advance, a color pattern is formed by spraying ink onto predetermined locations on the substrate other than the pattern using an inkjet method to color the transparent portion. Characteristic color filter manufacturing method. (2) A method for producing a color filter, wherein the ink according to item 1 is an active energy ray-curable ink.