JP2002365424A - Method and device for manufacturing color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a color filter curbing unnecessary motion and scatter of ink generated by shock caused by landing of ink liquid drops, curved discharge in discharging the ink liquid drops and generation of color mixing with adjacent pixels caused thereby, and curbing generation of nebulized ink liquid drops caused by the ink discharge and generation of color mixing caused by scatter thereof. SOLUTION: In the method for manufacturing the color filter, coloring is achieved by discharging the ink liquid drops 8 between partitioning parts 3 while scanning an inkjet head 2 with an ink discharge nozzle relative to a transparent substrate 1 with the partitioning parts 3. A transparent electrode 6 is formed on the transparent substrate 1. The ink liquid drops 8 discharged from the inkjet head 2 are landed on the transparent substrate 1 with the transparent electrode 6 formed thereon in a state of imparting a difference in potential between the ink in the inkjet head 2 and the transparent electrode 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color for coloring pixels by discharging ink droplets while scanning an ink jet head having a plurality of ink discharge nozzles relatively to a transparent substrate having a partition. The present invention relates to a method and an apparatus for manufacturing a filter.

[0002]

2. Description of the Related Art FIG. 5 shows a method of manufacturing a conventional color filter using an ink jet head. In FIG.
1 is a transparent substrate, 2 is an inkjet head for applying colored ink having an ink ejection nozzle, 3 is a partition, 4 is a pixel (pixel area), 5 is an electric signal for controlling the inkjet head, and 8 is an inkjet head. Ink droplets 9 are mist-like ink droplets formed together with the ink droplets 8.

A large number of pixels 4 are formed on a transparent substrate 1 by partitions 3. Then, it is necessary to discharge the ink droplets 8 from the inkjet head 2 to a correct position corresponding to the pixel 4 between the partitioning portions 3 at an appropriate amount and at a high speed, so that the ink droplets 8 are applied well.

As a method of applying the ink droplet 8 satisfactorily, for example, a method devised on the transparent substrate 1 is disclosed in
It is disclosed in JP-A-123313. In the method of manufacturing a color filter disclosed in this publication, sufficient ink is supplied to each pixel to prevent color mixing with an adjacent pixel.

That is, in this method of manufacturing a color filter, two layers are provided as a partition, a lower partition on the transparent substrate side and an upper partition formed by laminating the lower layer.
The one in which the critical surface tension of the lower partition part on the transparent substrate side is larger than the critical surface tension of the upper partition part on the partition part surface side is used. According to this manufacturing method, when the ink droplet is supplied into the pixel, the ink easily spreads in the pixel and the lower partition portion, and the supplied ink easily repels in the upper partition portion. In this way, color mixing with adjacent pixels is prevented.

[0006]

However, in the conventional method for manufacturing a color filter disclosed in the above publication, white spots and color mixing due to the behavior of ink after ink droplets have landed on a transparent substrate are prevented. However, unnecessary movement or scattering of the ink caused by the impact due to the landing of the ink droplet, or the ejection bending at the time of ejecting the ink droplet may occur, which may cause color mixing with an adjacent pixel. Further, there is also a problem that mist-like ink droplets are generated because ink is ejected at a high speed, and color mixture occurs due to the scattering. Furthermore, since the transparent substrate is apt to generate static electricity, the landed ink droplets may be scattered by the static electricity to peripheral pixels, resulting in color mixture.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and includes unnecessary movement and scattering of ink caused by impact due to landing of ink droplets, bending of ink droplets at the time of discharge, and color mixing with adjacent pixels. It is an object of the present invention to provide a method and an apparatus for manufacturing a color filter, which can prevent the generation of ink droplets and can also prevent the generation of mist-like ink droplets by ejecting ink at high speed and the occurrence of color mixing due to the scattering. It is assumed that.

[0008]

In order to solve the above-mentioned problems, a method of manufacturing a color filter according to the present invention is directed to a method of scanning an ink jet head having ink discharge nozzles relative to a transparent substrate having a partition. A method for producing a color filter that is colored by discharging ink droplets, wherein a transparent electrode is formed on the transparent substrate and a potential difference is provided between the ink in the inkjet head and the transparent electrode. The method is characterized in that ink droplets ejected from the inkjet head land on a transparent substrate provided with a transparent electrode.

According to this manufacturing method, unnecessary movement or scattering of ink caused by impact due to impact of ink droplets is prevented.
Distortion of ink droplets at the time of ejection, which can prevent color mixing with adjacent pixels, can be prevented, and mist-like ink droplets can be generated by discharging ink at high speed, and color mixing can occur due to the scattering. Can also be prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to a method of manufacturing a color filter according to the present invention, ink droplets are formed by causing an ink jet head having ink discharge nozzles to scan relative to a transparent substrate having a partition. A method of manufacturing a color filter that is colored by discharging ink, wherein a transparent electrode is formed on the transparent substrate, and a potential difference is provided between the ink in the inkjet head and the transparent electrode. Ink droplets ejected from the head are landed on a transparent substrate provided with a transparent electrode.

According to this method, the ink droplets discharged from the ink jet head are charged by the potential difference, and are not only discharged but also electrostatically attracted by the potential difference.
Lands on a transparent substrate. As a result, there is no color mixing with adjacent pixels due to unnecessary movement or scattering of ink generated by impact due to landing of ink droplets and bending of ink droplet ejection. Further, the generation of the mist-like ink droplet itself is suppressed, and even if it occurs, unnecessary movement and scattering are eliminated, so that color mixing does not occur. Furthermore, by connecting a specific potential to the transparent electrode, static electricity on the transparent substrate can be eliminated, and ink droplets do not scatter to peripheral pixels due to static electricity on the transparent substrate.

According to a second aspect of the present invention, in the color filter manufacturing apparatus, the ink droplets are ejected while the ink jet head having the ink ejection nozzles is relatively scanned with respect to the transparent substrate having the partition. A color filter manufacturing apparatus, comprising: a transparent electrode formed on the transparent substrate; and a power supply for generating a potential difference between ink in the inkjet head and the transparent electrode. And

According to this structure, the ink droplets ejected from the ink jet head are placed on the transparent substrate provided with the transparent electrodes in a state where a potential difference is provided between the ink in the ink jet head and the transparent electrodes. Can land. Therefore, with this configuration, it is possible to prevent unnecessary movement and scattering of ink caused by impact due to impact of ink droplets, and to prevent color mixing with adjacent pixels due to bending of ejection of ink droplets. And the static electricity of the transparent substrate can be eliminated, and the ink droplets can be prevented from being scattered to the peripheral pixels by the static electricity of the transparent substrate.

According to a third aspect of the present invention, in the color filter manufacturing apparatus according to the second aspect, the pattern of the transparent electrodes is arranged in a stripe pattern for each color ink in accordance with the pixels of the stripe arrangement. .

According to a fourth aspect of the present invention, in the color filter manufacturing apparatus of the second aspect, the pattern of the transparent electrodes is arranged in a delta arrangement for each color ink in accordance with the pixels in the delta arrangement. .

According to a fifth aspect of the present invention, in the color filter manufacturing apparatus of the second aspect, the pattern of the transparent electrodes is arranged so as to be a pixel row unit parallel to the nozzle arrangement direction of the ink jet head. Features.

(Embodiment) FIGS. 1 to 4 show a method and an apparatus for manufacturing a color filter according to the present invention.
This will be described with reference to FIG.

FIG. 1 shows the structure of a color filter manufacturing apparatus according to the present invention. In FIG. 1, 1
Is a transparent substrate serving as a base material of a color filter, 2 is an inkjet head for applying colored ink having ink discharge nozzles, 3 is a partition generally called a black matrix, and 4 is a pixel surrounded by the partition 3 (pixel area). ). In addition to these components, in the color filter manufacturing apparatus, the transparent electrode 6 is formed on the transparent substrate 1 and a potential difference is generated between the ink in the inkjet head 2 and the transparent electrode 6. A power supply 7 is provided. In FIG. 1, reference numeral 5 denotes an electric signal applied to the ink jet head 2 for controlling the ejection of the ink droplets 8, and reference numeral 9 denotes mist-like ink droplets generated when the ink droplets 8 are ejected.

In FIG. 1, when a potential difference is generated between the ink in the ink jet head 2 and the transparent electrode 6 by a power source 7, an electric signal
To eject the ink droplets 8 from the inkjet head 2 to the transparent substrate 1. At this time, the ink droplets 8 are charged not only by the kinetic energy based on the ejection force of the inkjet head 2 but also by the electric field due to the potential difference of the power supply 7, and accurately directed to the predetermined pixels 4 separated by the partition 3. Lands while being electrostatically attracted. In addition, since the ink droplets 8 can obtain the electric field energy due to the potential difference of the power supply 7 as the kinetic energy, the ejection force of the inkjet head 2 is reduced accordingly, that is, the ejection speed of the ink droplets 8 is reduced. By setting as described above, the amount of the mist-like ink droplets 9 can be suppressed.

Further, even when a small amount of mist-like ink droplet 9 is generated when the ink droplet 8 is ejected from the ink-jet head 2, the mist-like ink droplet 9 is applied to the transparent electrode 6 by the electric field due to the potential difference of the power supply 7. Is attracted electrostatically. Furthermore, even if the ink droplets 8 are ejected while being bent from the inkjet head 2 for any reason, the ink droplets 8 can be electrostatically attracted by the electric field due to the potential difference and land on the target pixel (pixel region) 4.

Further, since the ejection speed of the ink droplets 8 can be made smaller than that in the related art, the ink droplets 8 also become smaller by making the ejection speed smaller in this way, and land on the pixels 4 divided by the partitioning portions 3. At this time, the impact applied to the pixel 4 and the impact applied to the ink that has already landed are also reduced. Therefore, the ripples of the entire landed ink become small, and the ink does not scatter outside the predetermined pixels 4. Furthermore, since the transparent electrode 6 is energized, static electricity is prevented from being generated on the transparent substrate 1 after the ink droplets 8 land, and the ink droplets 8 are formed by the static electricity after landing as in the related art. There is no scattering to peripheral pixels.

As a result, the ink droplets 8 and the mist-like ink droplets 9 are prevented from being scattered to the adjacent pixels 4, and the color mixture between the adjacent pixels 4 is eliminated, so that good coloring can be achieved.

Here, the arrangement of the transparent electrode 6 may be as follows. FIG. 2 shows a color filter in which pixels 4 of three colors (red (R), green (G), and blue (B)) are arranged in a stripe shape. In this case, the color filter is transparent. The pattern of the electrode 6 is arranged in a stripe pattern for each color ink.

FIG. 3 shows a color filter in which pixels 4 of three colors (red (R), green (G), and blue (B)) are arranged in a delta arrangement. In this case, the patterns of the transparent electrodes 6 are arranged in a delta arrangement for each coloring ink. That is, in the cases shown in FIGS. 2 and 3, the transparent electrode 6 extends so as to extend in a direction perpendicular to the direction in which the ejection nozzles 2a of the inkjet head 2 are arranged. The transparent electrodes 6 corresponding to the pixels 4 of the same color are connected in parallel, and between the power source 7 and the transparent electrode 6, electricity from the power source 7 is selected for the transparent electrode 6 of each color. And a changeover switch 10 for connection.

In these configurations, when the inkjet heads 2 of each color (only the inkjet head 2 of one color is shown) relatively move to an appropriate ejection position on the pixel 4 corresponding to the color. In addition, the ink is ejected from the inkjet head 2 while the changeover switch 10 is switched so as to energize the transparent electrode 6 corresponding to this color, whereby the pixel 4 of the color to be landed and the pattern of the transparent electrode 6 providing the potential difference are formed. Since they match, it is possible to color the pixel (region) 4 satisfactorily and efficiently while effectively preventing color mixing.

As shown in FIG. 4, the transparent electrode 6 is
The ink jet head 2 may be arranged in pixel row units so as to be parallel to the arrangement direction of the ejection nozzles 2a. FIG.
3 shows a case where a color filter in which pixels 4 of three colors (red (R), green (G), and blue (B)) are arranged in a delta arrangement, which corresponds to pixels 4 in a stripe arrangement It is also possible to make it. Further, as shown in FIG. 4, a changeover switch 10 for selecting and connecting electricity from the power supply 7 to each transparent electrode 6 is also provided in this case.

When each ink jet head 2 (only one color ink jet head 2 is shown) relatively moves to an appropriate ejection position on the pixel 4 in that row, the transparent electrode in this row The ink is ejected from the inkjet head 2 while the changeover switch 10 is switched so as to energize 6.

In this method, since four columns of pixels to be landed coincide with the transparent electrode 6 providing the potential difference, the transparent substrate is not used in the conventional method due to various factors such as the characteristics of the ink jet head 2 and the characteristics of the relative moving means. In the case where color mixing in the relative movement direction between the ink jet head 1 and the ink jet head 2 occurs, the color mixing can be particularly effectively prevented.

When a color filter manufactured by these manufacturing methods as shown in FIGS. 1 to 4 is used for a liquid crystal display device, the transparent electrode 6 can be used as a common electrode.

[0030]

As described above, according to the method and apparatus for manufacturing a color filter of the present invention, a transparent electrode is formed on a transparent substrate, and the potential difference between the ink in the ink jet head and the transparent electrode. In the state where the ink droplets are ejected, the ink droplets ejected from the inkjet head are landed on a transparent substrate provided with a transparent electrode. In addition, the ejection of ink droplets is distorted, and color mixing with adjacent pixels due to those deformations is eliminated. Further, since no mist-like ink droplets are generated, color mixing due to the scattering can be eliminated. Further, ink droplets are not scattered to peripheral pixels due to static electricity of the transparent substrate due to landing, and color mixing with peripheral pixels due to this is eliminated. As a result, coloring can be performed well, and coloring performance is improved.

Further, the pattern of the transparent electrode is arranged in stripes for each color ink in accordance with the pixels in the stripe arrangement, or arranged in the delta arrangement for each color ink in accordance with the pixels in the delta arrangement. Since the pixel of the color to be landed and the pattern of the transparent electrode providing the potential difference match, while effectively preventing color mixing,
Pixels can be colored well and efficiently.

Further, by arranging the patterns of the transparent electrodes so as to be in pixel row units parallel to the nozzle arrangement direction of the ink jet head, it is possible to prevent color mixing between pixels in the relative movement direction of the ink jet head.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a configuration of an apparatus for manufacturing a color filter according to an embodiment of the present invention.

FIG. 2 is a plan view schematically showing an apparatus for manufacturing the same color filter which discharges ink onto a transparent substrate having a stripe arrangement according to the embodiment of the present invention.

FIG. 3 is a plan view schematically showing an apparatus for manufacturing the same color filter that discharges ink to a transparent substrate in a delta arrangement according to the embodiment of the present invention.

FIG. 4 is a plan view schematically showing a color filter manufacturing apparatus that discharges ink to a delta-arranged transparent substrate according to another embodiment of the present invention.

FIG. 5 is a side view schematically showing a configuration of a conventional color filter manufacturing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transparent substrate 2 Ink-jet head 3 Partition part 4 Pixel 6 Transparent electrode 7 Power supply 8 Ink droplet 9 Ink droplet 10 Drop switch

Continuation of the front page (72) Inventor Naoki Wada 8-1, Koshinmachi, Takamatsu-shi, Kagawa Prefecture Matsushita Hisashi Denshi Kogyo Co., Ltd. F-term (reference) 2C056 EA12 FA07 FB01 2H048 BA64 BB02 BB43 2H091 FA02Y FC01 GA03 GA11 LA15 2H092 GA20 PA06 PA08

Claims (5)

[Claims] 1. A method of manufacturing a color filter for coloring by discharging ink droplets while scanning an ink jet head having an ink discharge nozzle relative to a transparent substrate having a partition. Form a transparent electrode on the substrate, in a state where a potential difference is provided between the ink in the inkjet head and the transparent electrode, ink droplets ejected from the inkjet head,
A method for manufacturing a color filter, wherein the color filter is landed on a transparent substrate provided with a transparent electrode. 2. A color filter manufacturing apparatus for coloring by discharging an ink droplet while scanning an ink jet head having an ink discharge nozzle relatively to a transparent substrate having a partition. An apparatus for manufacturing a color filter, comprising: a transparent electrode formed on a substrate; and a power supply for generating a potential difference between ink in the inkjet head and the transparent electrode. 3. The apparatus for manufacturing a color filter according to claim 2, wherein the pattern of the transparent electrodes is arranged in stripes for each color ink in accordance with the pixels of the stripe arrangement. 4. The color filter manufacturing apparatus according to claim 2, wherein the pattern of the transparent electrodes is arranged in a delta arrangement for each color ink in accordance with the pixels in the delta arrangement. 5. The color filter manufacturing apparatus according to claim 2, wherein the pattern of the transparent electrodes is arranged so as to be a pixel row unit parallel to the nozzle arrangement direction of the ink jet head.