JPS62280803A - Manufacture of color filter - Google Patents

Abstract

PURPOSE:To obtain a film which is smooth and transparent as a whole, by providing a covering material by a transparent resin compound overcoat layer, and immediately thereafter, pressing a film against its surface, solidifying the overcoat layer and smoothing the surface, and thereafter, removing the film which has been welded by pressure. CONSTITUTION:The film strength is improved by drying and solidifying a color ink film 12 which has been formed, by an intaglio offset printing machine, and a transparent covering material which is mainly composed of an UV radiation type resin is printed by 1mum film thickness on the color ink film 12, by a screen printing machine. On the transparent covering material, a PET film of 100mum thickness is placed, and by a heating press device, the covering material and the PET film are heated by using a circular pressure system, and welded by pressure, by which an overcoat layer 13 is formed. A heating temperature in this case is set to 80-100 deg.C, and pressure by a press is set to 10-20kgW /cm<2>. Subsequently, an exposure by ultraviolet rays is executed from the surface to which the PET film has been welded by pressure, and thereafter, when the PET film is removed, the overcoat film surface becomes extremely smooth and the film thickness difference becomes <=0.1mum.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) The present invention provides a method for producing a colored ink film on a substrate such as glass by a printing method. The present invention relates to a method for manufacturing and modifying color filters used in liquid crystal displays and other photodetection components of precision electronic devices.

<Prior art> Blue I used for manufacturing liquid crystal displays, etc.
B), green + (31, red ζω 31 quintillion colored ink film?
If the colored ink coating surface of the color filter provided in the desired pattern is not smoothed, it may be difficult to attach it to other substrates such as thin glass for forming electrodes or colored striped polarizing plate glass when assembling it into a display. During lamination, voids and air bubbles will appear on the inner surface of the stack, and it will become impossible to adhere the glass to each other evenly. If the film thickness is uneven due to uneven parts, spatter tE will occur in the thick part of the film.
If [is insufficient or a sputtered film is not formed,
Problems tend to occur in the processing after manufacturing the color filter, such as wire breakage χ occurring. In addition, the transmittance is impaired due to the spread phenomenon caused by colored ink coverage and fine irregularities on the surface, and other optical losses occur.

Therefore, in color filters manufactured by forming a Maroha ink film on a glass substrate using a printing method, it is important to check the smoothness of the colored ink film and the uniformity of the film thickness. In order to solve the above-mentioned inconvenience, conventionally, a press roll heated to a predetermined temperature was used, and the blue ink was coated with a solvent that had evaporated to some extent after printing for a while to improve smoothness. I was trying to get it.

Is this what you mean using drawing 2? In terms of explanation, Fig. 2 1al and +bl show the colored ink film (17
J, the cross section in the rolling direction of the transfer blanket (hereinafter referred to as longitudinal section) and the cross section perpendicular to the rolling direction of the transfer blanket
Wataru! This is the shape of the I'r plane (hereinafter referred to as the cross section).

Figure 2 is on the board)? A circular pressure transfer blanket was moved from the right to the left in the drawing by rotating it twice to print each color on the colored ink coating U21χ substrate (LD). occurs,
When layering 111 layers of 2nd and 3rd colors, the boundary between the colored inks of each color becomes the lowest film thickness? show. In addition, the fjIi cross-sectional view in Figure 2 tl)l shows that the tonal ink film surface forms an arc within each color pixel, and as the second and third colors are printed, the film thickness reaches its minimum at the boundary between each color. , χ indicates that the film thickness is maximum at the center of each color.

(Problem to be Solved by the Invention) However, the thickness of the colored ink film on this color filter is about 5 μm at most, and when trying to smooth it with a hot press roll, it is necessary to apply pressure extremely uniformly. In addition, the strength is low due to the fusion of the colored ink film to the roll due to heat, so there is a strong tendency to follow the minute irregularities of the colored ink film in the same state.

While the coating material is fluid, press the film onto the film using a glue to avoid air bubbles. After that, the covering material? When removing the film after the coating surface has become smooth due to solidification, the solvent contained in the colored ink evaporates as 0 hours elapse after printing.
The flow rate of the blue ink (flow property 2) decreases, and the hardness of the colored ink increases. It is quite difficult to change the chi plasticity of such a coating.

Is the second invention a color filter? Immediately after a colored ink film is formed and solidified by the printing method, a transparent resin overcoat layer is applied on this film to make the surface smooth and to prevent air bubbles from entering during pressing. film? After crimping, solidifying this overcoat layer, and smoothing the surface, turn on the film. By removing it, a completely smooth and transparent coating 11g is obtained.
'& finally get.

(Function) The present invention allows colored ink to be applied onto a substrate such as glass using a printing method. In the method of manufacturing color filters,
Colored ink on the board? Using blue ink film on the filter pattern? After forming and solidifying, a blue ink film is applied.
Immediately after being coated with transparent resin, the transparent resin does not lose its fluidity, so it is better to use a film over it. After putting it on and crimping it with transparent la fat, this transparent T-shirt! B1 faith? Solidifies and finally becomes a film? By removing it, an overcoat layer 2 was formed, and the recessed portions of the colored ink rupture film were removed, and the film was able to be given "+" slipperiness.

(Effects of the Invention) The present invention can be applied to color filters manufactured using a printing method, regardless of unevenness that occurs on the surface of the colored ink coating formed on the glass substrate. Because it can be smoothed, uniform adhesion is possible when bonding the color filter to the electrode substrate or polarizing plate, and it also improves the transparency of the span filter and the color filter for one colored ink film. The brightness of each of the constituent B, G, and R colors is improved, and an appropriate color balance can be obtained even on a liquid crystal color display or the like. Another colored ink film? Since it is coated with resin,
The various durability of this transparent resin has been improved, and the printing method has a remarkable effect on the color filter's temperature. 11! :γ It is something to play.

Example 1 Using an intaglio Offcent 0111 machine, a blue ink film with a thickness of 6 to 5 μm was formed on a glass substrate according to an intaglio cell pattern using a colored ink χ mainly consisting of pigments and Yuge type epoxy resin. When the film was formed, there was a bulge (Max [thickness 5 μm
), resulting in a colored ink film '121. After increasing the strength of this colored ink film by drying and solidifying it, a screen printing machine was used to print it into a UV shining type i.
t Transparent covering material mainly for fingers, colored with a film thickness of 1 μm (marked 1 on 1, 2+).PET film with a thickness of 100 μm was placed on top of the transparent covering material.

The coating material and the PET film
The overcoat layer [
13) ¥ was formed. What is the heating temperature at this time?

80~100℃, press pressure 10~20kyVV
/Me was. Also, after exposing the pressure-bonded side of the PET film to ultraviolet light, the PET film? After removal, as shown in FIG. 1, the overcoat fracture surface b'' was extremely smooth and had a thickness difference of less than 0.1 μm.

<! jjP##=@implementationtsuH> In Example 1, overcoat 1-? A fluorine-based film that can be formed with a single spinner and has a pressure-bonded film with excellent releasability? used.

In addition, as mentioned in each implementation row above, one colored ink film? After printing on the substrate, it is hardened and then coated with a transparent UV-cured resin or the like. A certain degree of smoothness should be obtained in this state. but.

The coating material tends to follow the minute irregularities of the colored ink film, and the surface is completely smooth? I can't go far enough to get it. Before the coated transparent resin material solidifies, place 2 films on top of it and use a roller, etc.? Transparent 1”l with uniform force!
Crimp it onto the greasy material. After the transparent resin 6 has solidified, the film χ is removed, resulting in an overcoat layer made of a covering material with an extremely smooth surface as shown in FIG. 1 1alib+. Here, as a coating material, does it affect the colored ink film? What not to give? It is necessary to select. Also,
The solidifying conditions for the 4tt covering material also vary depending on the transparent 1t material, so make sure that there is no construction work that will have an adverse effect on the colored ink pattern, and that the covering material will not adhere to the film. must be taken. In this regard.

'Gishotsuki-cured Ifi or UV-cured wall resin has almost no temperature rise, so the compressed film does not expand or contract, and the film has good releasability. Therefore, Fig. 2 1
The smoothness of the surface coated with colored ink is considerably improved compared to al and +bl, and the difference in thickness is within 0.1 μm.

[Brief explanation of drawings]

Figure 1 is a sectional view when an overcoat layer r is provided on the ink film. FIG. 2 is a cross-sectional view of a colored ink film formed by printing. Lllll...Substrate (lγ...Colored ink film

Claims (5)

[Claims] (1) Form a colored ink film on the filter substrate in a pattern using printing ink using a printing method. After solidification, a transparent overcoat layer is provided, and a film is pressed onto the surface of the overcoat layer. After the overcoat layer is solidified, the film is removed. A color filter manufacturing method characterized by peeling. (2) The color filter manufacturing method according to claim 1, wherein the printing method is a screen printing method or an intaglio offset printing method. (3) The method for manufacturing a color filter according to claim 1, wherein the printing ink is mainly a pigment-based, solvent-based epoxy resin varnish. (4) The color filter manufacturing method according to claim 1, wherein the overcoat is any one of a printing method coating, a spin coating, and a roll coating. (5) The overcoat material is a transparent electron beam curable resin,
Claim 1 which is any of the ultraviolet curable resins
The color filter manufacturing method described in Section 1.