KR100571430B1 - Ink curable printing method and color filter made using the same - Google Patents

Abstract

The present invention relates to an ink curable printing method and a color filter manufactured using the same, and to provide a printing method capable of precisely printing R, G, and B color patterns of a color filter on a substrate, and a color filter using the same. For that purpose. The printing method for achieving the object of the present invention described above comprises the steps of: providing a light-transmissive mold having a predetermined concave surface; applying ink to the concave surface of the light-transmissive mold; Adhering to the substrate, transferring and curing the ink onto the substrate, curing the ink through light or heat, and removing the light transmissive mold from the substrate.

Curing, Ink, Printing, Color Filter, Mold, Display

Description

Printing method with Ink Cured and Color-Filter Fabricated by Using the Same}

1A and 1B are schematic cross-sectional and perspective views showing a method of manufacturing a mold according to the present invention.

2A and 2B are schematic cross-sectional and perspective views showing a printing method of printing a predetermined pattern on a substrate by transferring and curing ink on the substrate according to the present invention;

Fig. 3 is a schematic sectional view showing a printing method for printing a predetermined pattern on a substrate according to the prior art.

<Explanation of symbols for the main parts of the drawings>

100: master

110: template

120: template

120a: siloxane mold

125: siloxane resin

130: Ink

130a: photocuring ink

130b: residual ink

135: ink residue

140: substrate

150: doctor blade

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an ink curable printing method and a color filter manufactured using the same, and in particular, a predetermined pattern on a substrate using a photocurable polymer ink to produce a color filter for an ultra-thin liquid crystal display (TFT-LCD). The present invention relates to a printing method capable of precisely printing and a color filter manufactured using the printing method.

Recently, the demand for a display capable of realizing high definition, high definition, and a large screen video is increasing, and accordingly, a lot of research and development is in progress. TFT LCD is the most widely researched and commercialized type of such display. The color implementation method of TFT LCD controls the transmittance by passing white light from the backlight through the liquid crystal cell, and then adjacently arranged red (R), green (G), and blue (B) Through the color mixture of the light passing through the color filter is made. The color filter substrate includes a color filter that realizes color, a black matrix that distinguishes between R, G, and B cells and serves as a light blocking unit, and a transparent electrode (ITO, indium) for applying a voltage to the liquid crystal cell. tin oxide). The color filter is divided into a dye method and a pigment method according to the material of the organic filter used in manufacturing, and may be classified into a dyeing method, a dispersion method, an electrodeposition method, a printing method, and the like according to a manufacturing method.

At present, the most common method used for manufacturing color filters of TFT LCD is pigment dispersion method. The RGB pattern required for the color filter uses photolithography, which is one of pigment dispersion methods, and is formed by exposing them by moving the pixel pitch using the same mask in the order of R, G, and B. do. In general, since the color photoresist uses a negative photoresist, a portion that is not exposed is removed in the development process to complete a pattern. When the RGB pattern is protected and the common pixel electrode is formed, the planarization may be performed by spin coating a polymer-based resin to planarize the color filter surface. Using photolithography as described above, the shape and thickness of the printed ink can be uniformly produced, but the manufacturing process is complicated and expensive.

In order to form a low-cost pattern by a simple manufacturing process to escape from such a complicated manufacturing method of a known color filter, a method of manufacturing a color filter for display by printing a predetermined color pattern on a transparent substrate by a printing method has attracted attention. .

The printing pattern required for a normal color filter for liquid crystal displays or a color filter for plasma displays is very precise and uniformity in print shape and thickness is required. When the conventional printing method is used for such a filter substrate, ink is not easily fixed to the substrate because the ordinary substrate as the printing target is transparent glass and transparent resin. That is, when the color filter is manufactured using a conventional printing method, large variations occur in the shape and thickness of the printed pattern. Therefore, since it is difficult to stably print a precise pattern on the color filter substrate by the conventional printing method, the production of the color filter for liquid crystal display or the color filter for plasma display is not easy.

As an example, FIG. 3 shows, in schematic cross-sectional view, a method of printing a pattern on a substrate 140 by a conventional printing method on a substrate. The ink 130 is applied to the mold 120, the convex ink 130 is removed by the doctor blade 150, and the substrate 140 is pressed thereon to fill the concave surface of the mold 120. The ink 130 of the predetermined pattern is transferred. However, in this printing method, not all of the ink 130 filled in the concave surface of the mold 120 is transferred to the substrate 140, but the residual ink 130b remains at the corner of the concave surface. In addition, the ink 130 transferred to the substrate 140 may have poor smoothness of the printed ink due to the surface tension of the ink 130. When the smoothness of the ink printed in the color filter for liquid crystal display or the color filter for plasma display becomes poor, this changes the transmission direction of light, and lowers the transmittance of light, thereby degrading commodity value.

An object of the present invention is to solve the problems of the prior art, and to provide a printing method capable of precisely printing the R, G, B color pattern and the like of a color filter on a substrate. In addition, another object of the present invention is to provide a color filter manufactured by using this method at a low cost by a simple manufacturing process to avoid the complicated manufacturing method of a conventional color filter, and to provide a color filter manufactured using this method It is.

One aspect for achieving the object of the present invention described above is providing a light transmitting mold having a predetermined concave surface, applying an ink to the concave surface of the light transmissive mold, a light transmitting mold to which the ink is applied And bonding the substrate to the substrate, transferring and curing the ink to the substrate, curing the ink through light or heat, and removing the light transmissive mold from the substrate. This is provided.

The preparing of the light transmitting mold may include preparing a master on which a predetermined pattern is formed, filling the light transmitting resin on the master, curing the light transmitting resin, and separating the light transmitting resin from the master. Characterized in that it comprises a step.
In the step of transferring and curing the ink to the substrate, it is characterized in that the substrate is cured in a pressure-contacting state to the light transmitting mold.
The ink includes a photocurable ink, and in the step of curing the ink, the ink is cured by irradiating light.
The ink includes a thermosetting ink, and in the step of curing the ink, the ink is cured by applying heat.
The ink is characterized in that it comprises a conductive ink, and the step of applying the ink to the concave surface of the light transmissive mold is characterized by using a doctor blade technique.

The light transmissive resin is characterized in that it comprises a siloxane-based resin, the siloxane-based resin is characterized in that it comprises a polydimethyl siloxane resin.
The master may be manufactured by optical etching, and the substrate may include a transparent substrate, and the pattern printed on the transparent substrate may include a black matrix pattern for display.

The substrate includes a transparent substrate, characterized in that for repeating the steps, the pattern printed on the transparent substrate as R color, G color and B color pattern, wherein the R, G, B pattern is a delta array pattern It characterized in that it comprises a, wherein the R, G, B pattern is characterized in that it comprises a mosaic array pattern.

Another aspect for achieving the above object of the present invention relates to a substrate produced according to this printing method.

Another aspect for achieving the above object of the present invention relates to a color filter manufactured according to the printing method described above using the R, G, B pattern.

 The following describes a preferred embodiment of the present invention with reference to the drawings.

1A and 1B are schematic cross-sectional and perspective views showing a method of fabricating a mold according to the present invention.

1A and 1B, a master 100 having a predetermined pattern engraved by a photolithography method is installed in the mold 110. Thereafter, the mold 110 is filled with a siloxane resin 125, for example, a polydimethyl siloxane resin. After removing the air bubbles by leaving the mold 110 at room temperature for 5 hours to 7 hours in a well maintained state, the siloxane-based resin 125 is cured for 2 hours to 10 hours at 30 to 100 degrees Celsius. Let's do it. When the cured siloxane-based resin 125 is separated from the master 110, the siloxane-based mold 120a is completed. The siloxane-based mold 120a made of the siloxane-based resin 125 is a polymer resin mold made of a transparent material, and a method of printing ink on the substrate using the siloxane-based mold 120a will be described with reference to FIGS. 2A and 2B below.

2A and 2B are schematic cross-sectional and perspective views showing a printing method of printing a predetermined pattern on a substrate by transferring and curing ink on the substrate according to the present invention.

The photocuring ink 130a made of a polymer resin is applied to the siloxane mold 120a. At this time, the ink applied to the convex surface of the siloxane mold 120a is removed by the doctor blade 150. In addition to the doctor blade technique, ink coating can be performed using various methods such as spin coating. The substrate 140 is covered on the siloxane mold 120a to which the photocuring ink 130a is applied, and light is irradiated onto the siloxane mold 120a. Since the siloxane-based mold 120a is transparent, the photocuring ink 130a is cured by the light. When the substrate 140 is transparent, light may be irradiated from the substrate side. After curing of the photocurable ink 130a is completed, the siloxane-based mold 120a is removed from the substrate 140, and the photocurable ink 130a is printed on the substrate 140 in the same pattern as the master 110. During curing of the photocurable ink 130a, the substrate 140 may be in contact with the siloxane mold 120a so that the ink that may remain on the convex surface of the siloxane mold 120a is recessed in the siloxane mold 120a. It is preferable because it can be discharged to cotton or outside.

The most important step in this process is to apply a photocuring ink 130a made of a polymer resin on the siloxane-based mold 120a, and apply light while covering the substrate 140. Further, as the photocuring ink 130a, a polymer material obtained by mixing a color filter dye in an appropriate ratio may be used in a photocurable polymer resin such as a negative photoresist. In addition, various inks, such as thermosetting inks, may be used as other embodiments of the present invention.

The substrate 140 may be a color filter for display by using a glass substrate coated with a black diaphragm that serves as light blocking, and by printing the R pattern G pattern B pattern by the printing method, respectively. The R pattern G pattern B pattern may use a strip array pattern, a delta array pattern, a mosaic array pattern, or the like. The black diaphragm may also be printed by the printing method.

This printing technique can be applied to a circuit board by using a conductive ink, in which case it is possible to print a finer wiring pattern than conventional.

 When the printing method of the present invention according to the above configuration is applied to a color filter, the printed pattern is uniform, and the transmission direction and the light transmittance of the light are uniform, thereby preventing color bleeding or staining, thereby making the display clear and bright. That is, by using the present invention, since the manufacturing process is complicated and expensive color filters can be easily mass-produced with high precision, it is possible to innovatively lower the manufacturing cost of the TFT LCD, which is currently the most popular digital display.

This printing method, once the siloxane-based mold is produced, it is possible to continuously produce a color filter in a very simple process in a short time, and to form a pattern from nano size to hundreds of micro size depending on the master, color pattern Its uniformity and smoothness are also excellent.

In addition, when the conductive ink is used in accordance with such a printing method, it can be suitably applied to various fields such as a semiconductor fine circuit process.

Claims (16)

Providing a light transmissive mold having a predetermined concave surface, Applying ink to the concave surface of the light transmitting mold, Bonding the substrate with the ink-transmitting light-transmitting mold; Transferring and curing the ink to the substrate, curing the ink through light or heat, and removing the light transmissive mold from the substrate, and providing the light transmissive mold, Preparing a master on which a predetermined pattern is formed; Filling a light transmissive resin onto the master; Leaving bubbles at room temperature to remove bubbles; Curing the light transmitting resin at a predetermined temperature; and Separating the light transmitting resin from the master, wherein the light transmitting resin comprises a siloxane-based resin. delete The printing method according to claim 1, wherein in the step of transferring and curing the ink to the substrate, the substrate is cured in a state in which the substrate is pressed and adhered to the light transmitting mold. The printing method according to claim 1, wherein the ink comprises a photocurable ink, and in the step of curing the ink, the ink is cured by irradiating light. The printing method according to claim 1, wherein the ink includes a thermosetting ink, and in the step of curing the ink, the ink is cured by applying heat. The printing method according to claim 1, wherein the ink includes a conductive ink. The method of claim 1, wherein the step of applying ink to the concave surface of the light transmissive mold uses a doctor blade technique. A substrate printed according to the printing method of claim 1. delete The printing method according to claim 1, wherein the siloxane resin comprises a polydimethyl siloxane resin. The printing method according to claim 1, wherein the master is manufactured by optical etching. The method of claim 1, wherein the substrate comprises a transparent substrate, The pattern printed on the transparent substrate comprises a black matrix pattern for display. The method of claim 1, wherein the substrate comprises a transparent substrate, And printing the transparent substrate as R color, G color and B color patterns, repeating the above steps. The printing method of claim 13, wherein the R, G, and B patterns comprise a delta array pattern. The printing method as claimed in claim 13, wherein the R, G, and B patterns comprise a mosaic array pattern. Color filter printed according to the printing method of claim 13.

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