JPH0812294B2 - Color filter manufacturing method - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a method for manufacturing a color filter, and more particularly, to an improvement in a manufacturing method for forming a fine pattern using a printing means.

[Prior art]

A color filter used for a liquid crystal display or the like is often manufactured by repeatedly forming thin drawing lines made of so-called RGB three primary colors of red, green and blue on a transparent substrate made of glass or the like. An intaglio or intaglio offset printing method is often used as a means for continuously forming an image line, but in the case of a color filter, the formed image line must not be disturbed,
Ink is not printed in the shape of pinholes, and so-called white spots are not allowed. Even if it is a pinhole-like small blank defect, it cannot be used as a product when used as a liquid crystal display because the backlight directly looks into the eyes and appears white. In particular, in the case of color filters used for recent displays that require high resolution, a fine pattern in which extremely fine lines such as 50 μm are repeatedly formed is required, but when the pattern becomes fine, it is used for printing. It is difficult to uniformly supply the ink to the image groove provided on the printing plate, and the drying speed of the ink is also generally high, so that the above-mentioned blank defects tend to occur frequently. Therefore, in the current manufacturing process, a repair process is provided in order to improve the product yield.

[Problems to be Solved by the Invention]

For example, a red ink is supplied onto the printing plate, the ink is leveled by a squeegee, the excess ink 3R is scraped off by a doctor, and the ink is supplied to the image groove. Then, the blanket is brought into contact with the surface of the printing plate while rotating, and the ink supplied to the image groove is transferred to the surface of the plate cylinder blanket. Further, the plate cylinder blanket is brought into rotary contact with the smooth printing surface of the glass substrate to transfer the ink in the previous period to transfer the image pattern of the printing plate to the glass substrate. It slides in the direction of the line groove to scrape off the excess ink supplied to the printing plate.When scraping off the excess ink, the doctor should use a doctor Since the ink having surface tension remains only from the side of the ink that is pushed toward the advancing direction of the ink, a sufficient amount of ink cannot be left in the drawing groove that is initially scraped. In the intaglio offset printing performed by using the printing plate in which the ink is supplied to the image groove in this manner, blank defects which do not supply a sufficient amount of ink are selectively generated. However, the repair of a fine pattern is an extremely delicate work of repairing by hand while observing it with a microscope, so that there is a problem in that the efficiency cannot be improved in comparison with the amount of manual work. Therefore, the present invention intends to provide a printing means which does not cause a defect in the step of forming a fine pattern on a base plate in order to solve the problems of the prior art as described above.

[Means for Solving the Problems]

The present invention has been made to solve the above-mentioned problems of the prior art, and the gist thereof is a method of manufacturing a color filter in which a fine pattern is formed on a substrate by using a printing means, in which a regular pattern is formed by printing. A color filter for printing and forming a regular pattern and a dummy pattern adjacent to each other using a printing plate having a plurality of regular image groove and a dummy image groove adjacent to the outermost peripheral portion of the regular image groove. It is a manufacturing method.

[Action]

According to the method for producing a color filter of the present invention,
The blank defects that are likely to occur due to unstable ink supply and drying conditions are selectively generated in the dummy pattern portion adjacent to the regular pattern, and the regular pattern is normally printed and formed. Next, the present invention will be described in detail based on the illustrated embodiments.

Example 1 As the printing plate 1 used in the method for manufacturing a color filter according to the present invention, at least one dummy is provided at one end of a large number of regular image grooves 11a having a desired thickness and length. This is a printing plate in which the drawing groove 11d is formed adjacently. The regular image groove 11a is formed in a fine line (for example, a thickness of 100 μm) required by the standard of a color filter to be a product, and so-called RGB of red, green, and blue is formed on one surface of the glass substrate 2.
In order to form the desired regular pattern 3 by repeatedly forming the regular image lines 3r, 3g, and 3b of the three primary colors, the regular image line grooves 11a are separated by an interval of twice the thickness (in this case, 200 μm). Are installed in parallel. Further, the dummy image groove 11d is also the regular image groove 11a at the leftmost end of the drawing.
Are provided in parallel with each other with the same distance. The printing plate 1 is made by a conventional means such as a photoengraving technique well known to those skilled in the art, and a person skilled in the art is also familiar with the method of offset printing using the printing plate 1. A general description will be omitted, and only the constitutional requirements of the present invention will be described in detail. For example, a red ink 3R is supplied onto the printing plate 1 and smoothed by a squeegee (not shown), and then excess ink is applied by a doctor 4. Scrap off 3R, regular drawing groove
Ink 3R is supplied to each of 11a and the dummy image groove 11d. Then, the plate pupil blanket 5 is brought into contact with the surface of the printing plate 1 while rotating, and the ink 3R supplied to the regular image groove 11a and the dummy image groove 11d is applied to the plate cylinder blanket 5.
Transfer to the surface of. Further, the plate cylinder blanket 5 is brought into rotary contact with the smooth printing surface 21 of the glass substrate 2 to transfer the ink 3R, thereby transferring the image pattern of the printing plate 1 onto the glass substrate 2. 4 is a dummy image groove 11d of the printing plate 1
Slides in the direction of the regular image groove 11a (from the left side of the drawing to the right side) to scrape off the excess ink 3R supplied to the plate 1, and when scraping off the excess ink, the dummy image line Groove 11d
The ink 3R remaining on the dummy drawing groove 11d acts to draw out the ink 3R whose surface tension remains only from the ink 3R side which is pushed by the doctor 4 toward the regular drawing groove 11a on the right side of the drawing. Cannot retain a sufficient amount of Ink 3R. On the other hand, regarding the regular image groove 11a, even in the regular image groove 11a on the left side of the drawing facing the dummy image groove 11d, the ink 3R remaining in the dummy image groove 11d and the right side of the drawing by the doctor 4 Since the surface tension acts from both directions of the pushed excess ink 3R, a sufficient amount of ink 3R remains, so that a sufficient amount of ink 3R is supplied to all other regular image groove 11a. . In this way, a sufficient amount of ink 3R will
In the intaglio offset printing performed using the printing plate 1 uniformly supplied to the 11a, the red regular image line 3r was printed and formed in an extremely good state, and a sufficient amount of the ink 3R was not supplied. The blank defect 6 is selectively generated on the image line 3r '. Further, the regular image line 3r adjacent to the dummy image line 3r 'tends to have less ink 3R than the regular image lines 3r of other parts,
In particular, compared to the regular image line 3r at the opposite end (right end in the drawing), the drying speed is faster in terms of the amount of ink and white spot defects 6 are more likely to occur, but it is supplied to the adjacent dummy image line groove 11d. Due to the vapor pressure of the solvent evaporated from the generated ink 3R, the regular image lines 3r are prevented from being dried, so that the occurrence of blank defects 6 is effectively prevented. One dummy image line 3r is formed on the glass substrate 2 by the above method.
′ And a large number of regular image lines 3r are continuously formed at intervals of 200 μm, then the printing plate 1 is shifted to the right side of the drawing by 100 μm and a green dummy image line 3g ′ and a regular image line 3g are formed by printing in the same manner. When the blue dummy image line 3b 'and the regular image line 3b are formed by printing with a shift of 100 μm in the same direction, 100 μm
Width of the RGB primary colors 3r. 3g and 3b are printed repeatedly to form a desired regular pattern 3 formed on the dummy image line 3r.
Dummy patterns 3D formed by continuously printing ', 3g' and 3b 'are formed adjacent to each other. In this way, the color filter in which the regular pattern 3 and the dummy pattern 3D are formed adjacent to each other on one surface of the glass substrate 2 is similar to the conventional color filter in that the surface to be printed is polished by means such as polishing and rolling as necessary. The liquid crystal display is finished by performing a smoothing process and the like, and further disposing electrodes and enclosing a liquid crystal. The dummy pattern formed adjacent to the regular pattern 3 is adjacent to the regular image groove 11a on the scraping start side when the direction for scraping off excess ink by the doctor 4 is known as described above. It is sufficient to form it, but when the scraping direction by the doctor 4 is unknown at the time of making the printing plate 1, it is preferable to form it adjacent to all four sides of the regular pattern 3. For this purpose, for example, a dummy image groove 11d as shown in the embodiment is provided adjacent to the right side of the regular image groove 11a at the right end of the drawing and the left side of the regular image groove 11a at the left end of the drawing. The regular image groove 11a and the dummy image groove 11d may be formed in the vertical direction in the drawing so as to be longer than a specified length required for a liquid crystal display or the like. The regular pattern 3 and the dummy pattern 3D may be formed in a stripe shape or in a dot shape, and only one dummy image groove 11d may be provided, or two or more stripes may be provided. It can also be installed side by side. Further, the dummy pattern is not limited to the regular pattern 3 which serves as a display portion of a liquid crystal display or the like, and the alignment mark 7 formed on the end portion of the glass substrate 2 for alignment during manufacturing.
The same effect can be obtained by adjoining the regular pattern of.

Second Embodiment In the printing plate used in the second embodiment, a cross-shaped alignment mark 8 is provided outside the original pixel area, and a dummy pattern 9 irrelevant to its periphery is formed adjacently. It is a printed plate. The alignment mark 8 is a fine line (for example, a thickness of 100 μm) required by the positional accuracy of the color filter that is the product.
m), and the alignment marks 8r, 8g, and 8b of so-called RGB three primary colors of red, green, and blue are formed in a cross shape outside the area of the color filter pixel on one surface of the glass substrate 2, and the relative color of each color is formed. It is formed so that the position does not shift. A dummy pattern 9 is also provided around it so as not to make mixed contact with the alignment mark 8. The structures of the regular image groove and the dummy image groove in this printing plate are the same as those in the first embodiment, and the description thereof will be omitted.
In addition, in any part of the alignment mark, a sufficient amount of ink remains because the surface tension acts from both the ink remaining in the part such as the dummy pattern and the excess ink pushed to the alignment mark part by the doctor in any part. Therefore, a sufficient amount of ink is supplied to each of the other alignment mark portions. Therefore, since the print is formed in an extremely favorable state, a blank defect or the like does not occur. In addition, the amount of ink in that portion is particularly small with only the alignment mark, and the drying speed is high in terms of the amount of ink, and white spot defects are likely to occur, but the solvent evaporated from the ink supplied to the surrounding dummy pattern 9 is used. Depending on the vapor pressure of
Since the alignment mark is prevented from being dried, the occurrence of blank defects is effectively prevented. The shape of the alignment mark and the shape of the dummy pattern may be circular, L-shaped, hollow cross, etc., in addition to the cross shape. Further, the dummy pattern does not need to be in the shape of a straight line, a solid rope, a cross girder, a multiple contour of the alignment mark, or the like, and may be formed on only one of the alignment marks.

【The invention's effect】

As described above, the method for manufacturing a color filter according to the present invention is a method for manufacturing a color filter in which a fine pattern is formed on a substrate by using a printing means, and a dummy pattern is formed adjacent to a regular pattern. In addition, blank defects that are likely to occur due to unstable ink supply and drying conditions are selectively generated in the dummy pattern part and not in the regular pattern part, so a color filter is manufactured. The yield at the time has improved dramatically.

[Brief description of drawings]

FIG. 1 is an explanatory view of a process of producing a color filter by a printing means, FIG. 2 is an explanatory view of a process of supplying ink to a printing plate, FIG. 3 is an explanatory view of a color filter, and FIG. 4 is an alignment mark. FIG. 1 ... press plate, 11a ... regular image groove, 11d ... dummy image groove, 2 ... glass substrate, 3 ... regular pattern, 3b, 3g, 3r ... regular image line, 3b ', 3g' , 3r '... Dummy image, 3D ... Dummy pattern, 3R ... Ink, 4 ... Doctor, 5 ... Plate cylinder blanket, 6 ... Blank defect, 7 ... Alignment mark, 8 ... Alignment Mark, 9 ... Dummy pattern.

Claims (2)

[Claims] 1. A method of manufacturing a color filter for forming a fine pattern on a substrate using a printing means, comprising a plurality of regular image line grooves for forming a regular pattern by printing, and an outermost peripheral portion of the regular image line grooves. A method for producing a color filter, characterized in that a regular pattern and a dummy pattern are formed adjacent to each other by printing using a printing plate provided with a dummy image groove adjacent to each other. 2. The method of manufacturing a color filter according to claim 1, wherein the dummy pattern is provided in at least one direction of the regular pattern.