JPH0358003A - Production of fine pattern filter - Google Patents

Abstract

PURPOSE:To obtain the high-grade filters which are free from the deviation in transmittance and color tones by adding a prescribed loading pigment to ink so as to have a same ink film thickness in printing of patterns of three primary colors. CONSTITUTION:The fine pattern filters 1 are printed with red patterns 3r, green patterns 3 and blue patterns 3bg on a glass substrate 2. There are differences in the required amt. of the pigments in order to obtain the prescribed color tones generated among the respective colors of the red ink 4r, green ink 4g and blue ink 4b. The color tones are then in order of red > green > blue and differences arise in the ink films. The loading pigments to correct these differences are then added to the ink at the time of printing. The printing is then executed, by which the respective printing thicknesses of the red patterns 3r, the green patterns 3g and the blue patterns 3b are made the same. The same densities are, therefore, obtd. between the respective ink and the differences in the transmittances are eliminated.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for manufacturing a fine pattern filter that is combined with a liquid crystal display element and used as a display panel for, for example, a color television receiver.

[Conventional technology]

FIG. 5 shows an example of a conventional fine pattern filter 30 of this kind, which leads to the screen dimensions of a liquid crystal display element that combines, for example, a band-shaped red pattern 32R, a green pattern 32G, and a blue pattern 32B on a glass substrate 31. This can be obtained by repeatedly printing up to When this fine pattern filter 30 is combined with the liquid crystal display element 40, for reasons such as maintaining the accuracy of the combination, the fine pattern filter 30 is combined with the liquid crystal display element 40 as shown in FIG.
A transparent electrode 33 is further disposed on the red pattern 32R1 green pattern 32G and blue pattern 32B, facing the rear substrate 34 on which the back electrode 34a is disposed, and sealing the liquid crystal 35 between both substrates 31 and 34. However, this fine pattern filter 30 itself is used as one component of the liquid crystal display element 40.

[The problem that the invention tries to solve! i】

However, if we examine each of the red pattern 32R1, the green pattern 32G, and the blue pattern 32B in detail, we find that there is a difference in printing height, as shown in FIG. This is because there is a difference between the amount of pigment required in the red ink to obtain a predetermined color tone in the blue pattern 32B and the amount of pigment required in the blue ink to obtain a predetermined color tone in the blue pattern 32B. For this reason, a density difference occurs between the red ink and the blue ink, and after printing, the printing height generally becomes red pattern 32R>green pattern 32G>blue pattern 32B, resulting in a difference of at most 1 μm or less. becomes. The difference in height that occurs between the patterns 32R, 132G, and 32B causes a difference in the distance between the transparent electrode 33 disposed on the upper surface and the back electrode 34a disposed on the back substrate 34. The proper thickness of the liquid crystal 35 to be sealed is as small as 2 to 5 μm, and is critical. Therefore, the slight difference in height between the patterns 32R, 32G, and 32B may affect the operating characteristics of the liquid crystal 35, for example, due to a large transmittance. This causes problems such as a significant loss of display quality, and solving this problem is a problem in manufacturing the fine pattern filter 30, partly because of the minute dimensions. . For reference, the same amount of each color pigment is added to form a pattern with the same thickness. Alternatively, if you take measures such as polishing to make the thickness the same after printing, other problems such as a bluish tinge will occur in the image.
It cannot be a solution to the problem.

[Means to solve the problem]

The present invention provides a method for manufacturing a fine pattern filter in which a predetermined pattern is printed with ink of three primary colors as a specific means for solving the conventional problems described above.
The printing of the patterns of each of the three primary colors is performed by adding an extender pigment to compensate for the difference in the amount of pigment required to obtain a predetermined color tone between the inks of the three primary colors so that the printed ink film has the same thickness. The above-mentioned conventional problems are solved by providing a method for manufacturing a fine pattern filter, which is characterized in that the manufacturing method is carried out using ink adjusted to the following.

[For production]

According to the present invention, by adding an extender pigment that corrects the difference in the amount of pigment required to obtain a predetermined color tone that occurs between the inks of the three primary colors, the inks of the three primary colors have the same density without disturbing the predetermined color tone, There will be no difference in thickness in the pattern after printing.

【Example】

Next, the present invention will be explained in detail based on an embodiment shown in the drawings. What is indicated by the reference numeral 1 in FIG. 1 is a fine pattern filter formed by the manufacturing method according to the present invention.
The fact that the green pattern 3g1 and the blue pattern 3b are provided by printing is the same as in the conventional example, but according to the present invention, each of the three primary colors for printing the respective patterns, that is, the red pattern 3rs, the green pattern 3g1, and the blue pattern 3b. of ink, namely red ink 4r1 green ink 4g
, by adding an extender pigment to the blue ink 4b that corrects the difference in the required amount of pigment to obtain a predetermined color tone between the respective colors, the red pattern 3rs, the green pattern 3g1, and the blue pattern 3b have the same printing thickness. It is said to belong to Above red ink 4rs green ink 4gx blue ink 4b
To explain the correction in more detail, as explained in the conventional example, the required amount of each pigment to obtain a predetermined color tone is in the order of red ink 4r>green ink 4g>blue ink 4b. is the standard value of 100% by measuring the amount of red pigment 5r added to a predetermined amount of liquid resin 5, which is the base material shown in FIG. The green ink 4g and the blue ink 4b are corrected by taking into account the following conditions. Here, if the specific conditions for performing the above correction are described as reference data, the liquid resin 5 may be a bisphenol type epoxy resin (
Product name Ebicoat 1004. Made of Yuka shell epoxy)
, Aerosil R-972 (manufactured by Nippon Aerosil M) was used as the extender pigment 6, a mixture of ethyl carbitol and butyl cellosolve at a weight ratio of 2:1 was used as the solvent, and red pigment 5r: Lio was used as the pigment for each color. 70 g of Nogen Red GD, 30 parts of Onogen Orange R, 5 g of green pigment: 75 parts of Lionor Green 2YS, 25 parts of Onogen Yellow, blue pigment 5b: 80 parts of Lionor Blue ES, 20 parts of Onogen Violet RL. (All of the above were manufactured by Toyo Ink ■). First, in the case of 4 g of the green ink shown in FIG.
Since the measured value of r was 65% by weight compared to the amount added, 35% by weight of a pale extender pigment 6 such as powdered silica was added to 4 g of this green ink. By adding the extender pigment 6, the red ink 4r,
Since this green ink 4g has exactly the same density, for example, the red pattern 3r and the green pattern 3 printed on the glass substrate 2 by an offset printing machine (not shown)
g means that the printing thickness is exactly the same. Similarly, since the amount of blue pigment 6b in the blue ink 4b shown in FIG. 4 was 1143% by weight, 57% by weight of the extender pigment 6 was added, and the same effect as in the green ink 4g was obtained. It becomes something that can be done. Ink 4r14g14b of each color corrected by the above procedure
Table 1 shows the composition of . Next, to describe the effect of adding the extender pigment 8, the concentration of the green ink 4g and the blue ink 4b is adjusted to be the same as that of the red ink 4r, and at the same time, the above-mentioned extender pigment produced by adding the extender pigment 6, which is originally colorless. The red pattern 3rt, the green pattern 3gs, and the blue pattern 3b do not have even the slightest change in tone.

【Effect of the invention】

As explained above, the present invention uses inks that are adjusted to have the same thickness by adding an extender pigment to compensate for the difference in the amount of pigment required to obtain a predetermined color tone that occurs between the inks of the three primary colors. By using a manufacturing method for a fine pattern filter that prints on one side of the liquid crystal display element, the difference in printing thickness that occurs between each pattern due to the difference in the density of the ink of each color can be eliminated, and this fine pattern filter can be printed on one side of the liquid crystal display element. Even when used as a substrate, it is possible to improve the display quality of the entire display panel by solving the difference in transmittance of liquid crystal caused by the difference in printing thickness without causing color tone deviation. It has the following effects.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a fine pattern filter obtained by the manufacturing method according to the present invention, FIGS. 2, 3, and 4 are explanatory views showing an embodiment of the present invention.
The figure is a plan view showing a conventional fine pattern filter, and FIG. 6 is a sectional view showing an example of a combination of the conventional fine pattern filter and a liquid crystal display element. 1 ------- One fine pattern filter 2 - =--- Glass substrate 3 r =------ One red pattern 3 g--- One green pattern 3 b--------- Blue Pattern 4 r-----1 red ink 4 g-----1 green ink 4 b----1 blue ink 6--11-11 liquid resin 5 r----- ---1. Red pigment 5 g-----1 Green pigment 5b--1 Blue pigment 8----- Integral pigment

Claims (1)

[Claims] In a method for manufacturing a fine pattern filter in which a predetermined pattern is printed with inks of three primary colors, the printing of each of the three primary color patterns is performed using the necessary amount of pigment to obtain a predetermined color tone between the inks of each of the three primary colors. A method for manufacturing a fine pattern filter, characterized in that the process is carried out using ink adjusted so that printed ink films have the same thickness by adding extender pigments to correct differences.