JPH05142407A - Production of color filter - Google Patents

Abstract

PURPOSE:To obtain the process for production of the color filter for a display material which can simplify the process for production by continuously changing the relative positions of micronozzles discharging picture element forming materials as fluid and a transparent substrate. CONSTITUTION:The relative positions of the micronozzles for discharging the picture element forming materials and the transparent substrate are continuously changed, by which colored patterns are formed in the form of a stripe on the transparent substrate, by which the color filter is produced. More specifically, the stripe-shaped colored patterns 14, 15, 16 are formed by a method of continuously moving downflow heads 11, 12, 13 having the micronozzles for discharging the green, red and blue picture element forming materials or a method of fixing the downflow heads 11, 12, 13 and continuously moving the transparent substrate 17. The relation between the outflow speeds of the picture element forming materials and the changing speeds of the relative positions of the substrate and nozzles is more convenient if both are fixed rather than both are cooperatively moved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a color filter for display materials.

[0002]

2. Description of the Related Art The main manufacturing method of a conventionally known color filter is a dyeing method,
The pigment dispersion method, the electrodeposition method, and the printing method are used for commercial production. The disadvantage common to all the methods is that the number of manufacturing steps required for manufacturing the color filter is large, and the manufacturing cost and manufacturing loss resulting from this are extremely high.

Even in the printing method which is said to be the most productive among the above, a technique for simultaneous multicolor printing has not been established, and printing, drying, and drying each time a pattern of one color is formed.
It requires a curing step. This is because the printing of the color filter requires precise printing with high color density (thus high printing film thickness), unlike ordinary printing.

In view of the above circumstances, it is an object of the present invention to provide a method of manufacturing a color filter for a display material, which manufacturing process can be simplified.

[0005]

A method of manufacturing a color filter according to the present invention, which achieves the above-mentioned object, is constructed by a temperature change,
Stripes are formed on the transparent substrate by continuously changing the relative position between the minute nozzles that flow out the pixel forming material that forms a solid-phase colored film by solvent evaporation, heat curing, or radiation curing as a fluid, and the transparent substrate. It is characterized in that a pixel forming material is stacked in a stripe shape to form a colored pattern.

The details of the present invention will be described below. The present invention relates to a color filter manufacturing method in which the number of manufacturing steps is reduced, and a target color filter is a so-called stripe-shaped color filter.

The color filter of the present invention is manufactured by continuously changing the relative positions of the minute nozzles flowing out of the pixel forming material and the transparent substrate to form a colored pattern in a stripe pattern on the transparent substrate. It More specifically, the stripe-shaped coloring is performed by fixing the transparent substrate and continuously moving the minute nozzles that flow out the pixel forming material, or by fixing the minute nozzles and continuously moving the transparent substrate. It is a method by forming a pattern.

In this case, it is possible to form a uniform stripe pattern by interlocking the outflow speed of the pixel forming material with the changing speed of the relative position of the substrate and the outflow nozzle.
It is convenient to keep the outflow speed of the pixel forming material constant and the constant changing speed of the relative position between the substrate and the nozzle.

It is possible to install a larger number of minute nozzles than the number required to form a color filter, and to form all parallel stripes in a single operation. It is also possible to install less than the number required for filter formation and to form all parallel stripes by repeating the operation twice or more.
In order to perform the manufacturing most efficiently, there is a method of installing the same number of color stripes that require minute nozzles that flow out pixel forming materials of different colors, and this makes it possible to manufacture a multi-color color filter in one operation. You can do it.

In the above-mentioned method operation, it is essential that the flow of the pixel-forming material from the minute nozzles is at a constant speed in order to form a colored stripe pattern having a uniform width and thickness, but the flow is started and stopped. At this point in time, the outflow rate fluctuates, which may cause an undesirable variation in the width and thickness of the colored stripe. Therefore, it is desirable that the outflow from the minute nozzles be steady and continuous, but as another request, it is necessary for the color filter to have no pixel pattern outside the desired pixel pattern region.

To meet these contradictory requirements, a coating layer that can be removed by peeling or melting is formed in advance outside the pixel pattern forming region on the transparent substrate, or a film that can be removed by peeling or melting. Are overlapped in advance and the pixel forming material is discharged from the minute nozzles, and then the coating layer or film outside the pixel pattern forming area is removed by peeling or melting to remove the color stripe outside the pixel pattern forming area. It is possible to manufacture a color filter that does not exist.

In order to form a stripe-shaped pixel pattern with a uniform width and a uniform thickness, it is important to keep the outflow speed of the pixel forming material from the minute nozzles uniform. It is possible to maintain a uniform outflow rate to a considerable extent by pressurizing the liquid with a high-quality commercially available pulseless pump or pressurizing with a piston. It is also possible to maintain a more uniform outflow rate by using a method in which the pressure is finely controlled with the above gas to pressurize and the pixel forming material is caused to flow out from the fine nozzle.

In the color filter for the display device, in addition to the one in which only the colored stripes are arranged in parallel, a type having a so-called black matrix for separating pixels for a TFT or the like is also used.

The method of the present invention is also useful in this case, and black stripes can be formed by flowing out the black stripe forming material, and by repeating the operation twice at a right angle, a grid-like shape can be obtained. A black matrix can be formed. If the dimensional accuracy required for the black matrix is extremely strict, or if the required black matrix has a complicated shape that cannot be formed with two orthogonal stripes, it is necessary to make a transparent substrate beforehand. It is possible to manufacture a color stripe filter with a black matrix by forming a black matrix by a so-called photolithography process and then flowing out the pixel forming material on the black matrix.

When the black matrix formed in advance is parallel to the pixel stripes, the thickness of the black matrix is not particularly limited, but when the black matrix has elements orthogonal to the pixel stripes. In the case of a thick black matrix, the shape of the falling stripe pattern may be disturbed at the thickness difference. In this case, it is desirable to use a thin black matrix formed by the metal vapor deposition film etching method.

The shape of the fine nozzle is not particularly limited, such as a circle or a rectangle, but it is generally an opening of 10 to 100 micrometers, and the method of making it is not limited, but it is similar to the nozzle for manufacturing chemical fibers, such as electric discharge machining. Can be precisely manufactured by the method.

The pixel forming material to be discharged is not particularly limited as long as it can form a color stripe pattern desired as a color filter on a transparent substrate, but a heat-melting resin is melted by heating to dissolve or disperse a dye or a pigment and heat is generated. A fluid in the molten state, or a thermosetting resin,
It may be a fluid in which a radiation curable resin or other polymer material capable of forming a film is dissolved in a solvent to dissolve or disperse a dye or a pigment.

These fluids are applied onto a transparent substrate, and then subjected to a cooling treatment in the case of a heat-melting resin, a drying process in the case of using a solvent, and a curing (thermosetting, radiation curing such as light) stripes. It is stabilized as a stripe-shaped colored film to form a pixel pattern of a color stripe filter.

When the flatness of the surface of the color filter is required, it is possible to perform self-leveling treatment by heating and standing and flattening treatment by roller pressing.

The dyes and pigments used must have the spectral absorption characteristics and storage stability necessary for a color filter, but the dyes described in numerous patent specifications relating to color filters known so far. In general, pigments can be used.

A glass plate is suitable for the transparent substrate, but a plastic plate or film may be used, and a treatment for improving the adhesion with the pixel forming material to be flowed down should be performed in advance. May be useful.

[0022]

EXAMPLES A preferred embodiment of the present invention will be described below with reference to a conceptual diagram, but the scope of the claims of the present invention is not limited to the description of the present embodiment. In FIG. 1 and FIG. 2, reference numerals 11, 12, and 13 respectively show flow-down heads having minute nozzles for flowing green, blue, and red stripe forming materials, respectively, and have a diameter of 50 micrometers and a pitch of 300 micrometers. 120 nozzle
Ke is open. Further, in the figure, 14, 15 and 16 are color stripe forming materials provided on a glass plate, and 17 is a glass plate. The fluid, which is the green stripe forming material, is a coloring liquid consisting of phthalocyanine green, alkyd phthalic anhydride resin, linseed oil, and butyl cellosolve.The blue and red stripe forming materials are carmine blue and brilliant carmine instead of phthalocyanine green. Made using red.

FIG. 3 schematically shows the cross-sectional shape of the color filter. In the case of the present embodiment, a substantially perfect stripe shape is obtained only by the flow-down application step (see FIG. 3A), but it is possible to obtain a shape with even better flatness by the flattening process with the pressure roller. (See FIG. 3 (B)), the color filter was completed by carrying out the successive heat curing treatment.

[0024]

As described above in connection with the embodiments, the color filter manufacturing method according to the present invention continuously changes the relative positions of the minute nozzles and the transparent substrate for flowing out the fluid pixel forming material, Since the stripe-shaped colored pattern is formed on the transparent substrate, the manufacturing is simplified, and the color filter can be manufactured efficiently and stably.

[Brief description of drawings]

FIG. 1 is a schematic view showing a color stripe formation state according to an embodiment.

FIG. 2 is a side view of FIG.

FIG. 3 is a schematic diagram of a cross-sectional shape of a color filter.

[Explanation of symbols]

 11,12 13 Downflow head 14,15,16 Color stripe forming material 17 Glass plate

Claims (10)

[Claims] 1. A relative position between a minute nozzle for discharging a pixel forming material forming a solid-phase colored film as a fluid by temperature change, solvent evaporation, heat curing or radiation curing as a fluid, and a relative position are continuously changed. Thus, a method for manufacturing a color filter, characterized in that a pixel forming material is stacked on a transparent substrate to form a colored pattern. 2. The method of manufacturing a color filter according to claim 1, wherein the transparent substrate is fixed and the fine nozzles are continuously moved. 3. The method of manufacturing a color filter according to claim 1, wherein the minute nozzles are fixed and the transparent substrate is continuously moved. 4. The color filter manufacturing method according to claim 2 or 3, wherein the outflow speed from the minute nozzles is a constant speed, and each continuous moving speed is a constant speed movement. Manufacturing method. 5. The method for producing a color filter according to claim 1, wherein the number of fine nozzles required for forming the color filter or more is installed, and the number of parallel stripes required for one operation is formed. A method for manufacturing a color filter, which is characterized in that 6. The method for manufacturing a color filter according to claim 1, wherein the number of minute nozzles is less than the number required for forming the color filter, and the parallel stripes are formed by repeating the operation twice or more. Color filter manufacturing method. 7. The color filter manufacturing method according to claim 1, wherein fluids of different colors are simultaneously flown out by fine nozzles to form a multicolor color stripe filter by a single operation. Filter manufacturing method. 8. The method for manufacturing a color filter according to claim 1, wherein a coating layer that can be removed by peeling or melting is formed in advance on a portion other than the pixel pattern forming region of the transparent substrate, or peeling or melting. A method for producing a color filter, characterized in that after stacking thin films which can be removed, a pixel forming material is flowed down, and then the pixel pattern outside the pixel pattern forming region is removed together with the coating layer or the thin film. 9. The method of manufacturing a color filter according to claim 1, wherein the shape of the fluid reservoir of the fine nozzle is a closed tank capable of supplying fluid intermittently or continuously, and pumping liquid feed pressurization and piston. The shape is such that it can be pressurized by means of pressure or gas, and the size of the fluid does not flow out when the diameter of the micro nozzle is not pressurized, and it constantly flows out when pressure is applied. A method for manufacturing a color filter, characterized by being present. 10. The method of manufacturing a color filter according to claim 1, wherein a black matrix is previously formed on a transparent substrate, and a pixel forming material is flown down on the black matrix. Manufacturing method.