JPH10148714A - Production of color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the adhesion property between a substrate and an accepting layer for coloring agent and to prevent decrease in the yield for the production of a color filter by avoiding irradiation with light to give repelling property against a coloring agent in a non-picture display region but leaving the accepting property for a coloring agent in the non-picture display region. SOLUTION: A resin compsn. comprising a transparent material which has coloring property by permeation of an ink and can also show repelling property against a coloring agent by irradiation with light is applied on a glass substrate 51 to form an accepting layer 53 for a coloring agent (b). The accepting layer 53 for a coloring agent only in the part corresponding to a non-colored part 58 is irradiated and hardened with UV rays through a photomask 54 to form the noncolored part 58 between adjacent pixel lines 57 (c). In this case, the photomask 54 is also used to shield a nonpicture display region 11 from light so that the region 11 is not irradiated with UV rays. Therefore, the nonpicture display region 11 is not hardened with light and the accepting layer 53 for a coloring agent is maintained as the initial state which maintains permeability for an ink.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter and, more particularly, to RGB suitable for fine color separation of a color image sensor, a color sensor, a liquid crystal color display, and the like.
A color filter having a regular pattern.

[0002]

2. Description of the Related Art In recent years, demands for higher definition, lighter weight, lower cost, and the like of input / output devices such as color image pickup devices and color image display devices have been increasing, and accordingly, these devices are indispensable. Various elemental technologies are being developed.

In particular, the fundamental improvement of the color image display device is being advanced, and instead of the CRT which has been the mainstream of the conventional color image display device, it is lightweight, requires little space, and is suitable for carrying. Liquid crystal displays are rapidly spreading. However, in a liquid crystal display, it is technically difficult to increase the size of the liquid crystal display, and the rate of price increase tends to increase. For this reason, various methods for cost reduction are being continued. Liquid crystal displays currently in practical use include an active matrix type (a so-called TFT panel) having a TFT for each pixel.
Or a liquid crystal itself using a ferroelectric liquid crystal (FLC) having switching characteristics, ON / OFF of a TN liquid crystal
Some use STN liquid crystals having improved characteristics.

[0004] One of the large production costs of these color liquid crystal displays is a color filter which is indispensable for a color image display panel. In a liquid crystal display panel, a pixel portion has a function of modulating the amount of light transmitted through the pixel portion. In this case, 2
The direction of the liquid crystal molecules in the liquid crystal layer sandwiched between two polarizing plates is controlled by an electric field, the birefringence of the liquid crystal in the direction perpendicular to the polarizing plate is controlled, and the amount of light transmitted through the liquid crystal panel is modulated. The method is commonly used.

Therefore, in order to display a color image,
It is necessary to form a color filter in each of the pixel portions. For this purpose, the entire panel is usually divided into a number of fine picture elements, and the picture pixels in the picture are further divided into three or more pixels, so that red (R), RGB3 such as fine (usually about several tens to 100 μm in size), delta, stripe, and mosai that transmit light of a wavelength corresponding to green (G) or blue (B) and cut light of other wavelengths An optical filter having a regular pattern of primary colors is formed. Furthermore, by covering each fine filter with a grid-like light-shielding portion that does not allow light to pass through, a method of enhancing blackness and preventing color mixing between adjacent pixels to improve color reproducibility is adopted. And
As the light-shielding portion, a part of the wiring is used, or a light-shielding layer called a black matrix (BM) is formed. As described above, since the structure of the color filter is quite complicated and fine, there were many problems that had to be solved in order to manufacture the color filter at low cost.

Various proposals have been made as to a method for reducing the cost of a color filter. One of the promising methods is an ink jet recording apparatus disclosed in JP-A-59-75202. The method used was mentioned. That is, if the colorant of each color required for the pixel can be accurately supplied to the fine pixel portion by the inkjet recording method, the manufacturing process of the color filter is greatly simplified. It can be expected that color filters will be produced at much lower cost than by the manufacturing method.

[0007] However, for example, the drawing resolution of an ink jet recording head used in a printer is as follows.
It is not sufficient for drawing pixels of a color filter. That is, the pixel of the color filter has a size of 10
Since it is as small as about 0 μm or less, it is difficult to draw by an inkjet method using a recording head for a printer, and it is not easy to accurately strike different colors of ink on adjacent pixels. Further, it is easy for the injected ink to frequently diffuse in the colorant receiving layer or to spread and mix (color mixture) on the surface. In a color filter, if color mixing occurs between pixels, color control becomes impossible.

On the other hand, in order to prevent color mixing of ink between pixels, for example, in a colorant receiving layer formed on a substrate, a pixel portion is left as a colorant receiving region, and the other pixels are separated. Japanese Patent Application Laid-Open No. 4-123005 discloses a method of forming a layer that repels ink on the surface of a region that is not desired to be colored and then applying a colorant to a colorant receiving layer.
However, this method has a limitation in preventing color mixing between pixels because the ink diffuses inside the colorant receiving layer below the ink-repelling layer, and coloring with the ink due to the photolithography process. There are problems such as the necessity of etching resistance of the agent receiving layer and the increase in cost due to steps such as development and washing.

In order to avoid these problems, Japanese Patent Application No.
JP-A-286616 discloses a method in which a pixel portion is left as a colorant receiving region where ink easily permeates, and a resin around the pixel and which forms a colorant receiving layer by irradiating light between the pixels is cured. It has been proposed to form a region for suppressing ink penetration by applying a colorant to a colorant receiving region by an inkjet recording method. By using such a method, it is possible to avoid a problem caused by insufficient resolution of the inkjet recording method when drawing pixels of a color filter.

[0010]

However, in the above prior art, light is not irradiated only to the pixel portion that needs to be colored, and all other portions without pixels other than the pixel portion (hereinafter referred to as non-pixel portions) are not used. A method of irradiating light to the pixel area) to cure the color filter so that the colorant does not penetrate into this area has been adopted. However, according to the study of the present inventor, a color filter is formed by such a conventional method. It has been found that when formed, the adhesion between the glass substrate and the colorant receiving layer may be weakened. On the other hand, in particular, in the non-pixel area, an area without pixels around the image display area of the color filter (hereinafter, referred to as a non-image display area) is used for tab mounting and the like, so that the color filter and the substrate are Strong adhesion is required, and a decrease in adhesion in the non-image display area is not particularly allowed.

[0011] The decrease in the adhesion between the substrate and the colorant-receiving layer as described above is caused by the material of the colorant-receiving layer and the material of the substrate, particularly the type of glass used for the substrate, and the substrate and the colorant-receiving layer. When a black matrix is formed between the layer and the layer, it is affected by the material of the material forming the black matrix. Other factors that affect the adhesion include the effect of the cleaning state of the substrate. Although the weak adhesion between the color filter and the substrate described above is not a fatal disadvantage for the function of the color filter, it may lead to a decrease in the yield when producing the color filter. There is a need for more reliable and better adhesion. Accordingly, it is an object of the present invention to provide a more reliable color filter manufacturing method for enhancing the adhesiveness between a substrate and a colorant receiving layer in a color filter manufacturing method.

[0012]

The above object is achieved by the present invention described below. That is, the present invention relates to a method for manufacturing a color filter in which an image display region having at least a light-shielding portion and a colored pixel portion, and a non-image display region arranged around the image display region are provided on a transparent substrate. After applying a substantially transparent material to which a color repellent property is imparted by light irradiation onto a transparent substrate to form a colorant receiving layer on the entire surface of the substrate, a part of the colorant receiving layer is exposed to light. In the method for producing a color filter in which a colored pixel portion is formed by irradiating light to impart a color repellent property to a light-irradiated portion and thereafter supplying a colorant to a colorant-receiving layer in an image display area, A method for producing a color filter, characterized in that irradiation is not performed on a non-image display area, and colorant receptivity is left in the non-image display area without imparting color repellency.

[0013]

Next, the present invention will be described in more detail with reference to preferred embodiments. The present inventor has conducted intensive studies to solve the above-mentioned problems of the prior art, and as a result, in a method for preventing color mixture of a colorant between pixels having different colors, a colorant receiving layer in which the colorant is absorbed is used. When light is irradiated and light-cured to form a non-colored portion having a color repellent property, the adhesive strength between the light-cured non-colored portion of the substrate and the colorant-receiving layer increases the colorant-receiving property. The inventors have found that the layer is lower than a colorable portion which has not been photocured, and have reached the present invention. Although this mechanism has not been clearly elucidated, when the resin forming the colorant receiving layer is irradiated with light and the resin in that portion is photocured and crosslinked, the portion of the cured polymer becomes It is considered that the reactivity between the colorant receiving layer and the substrate decreases, the chemical adsorption force of the colorant receiving layer to the substrate weakens, and the adhesion between the substrate and the colorant receiving layer decreases. Therefore, in the present invention, unlike the conventional case, the entire non-pixel region of the colorant receiving layer is not light-cured, and at least the non-image display region is colored without imparting the color repellent property. By leaving the agent receiving property, the adhesion between the transparent substrate of the color filter and the colorant receiving layer is improved.

A color filter manufactured by the manufacturing method of the present invention includes an image display region having at least a light-shielding portion and a colored pixel portion, and a non-image display region arranged around the image display region on a transparent substrate. However, the image display area is obtained as described below. For example, first, a colorant receiving layer is formed on a transparent substrate having a light-shielding portion formed by a black matrix (BM) or the like provided on a transparent substrate and an unshielded opening for forming a colored pixel portion. Uniformly formed, then, for the purpose of preventing color mixing of the colorant between adjacent pixels, which is likely to occur when applying the colorant,
The material for the colorant receiving layer is exposed to light having a wavelength having sensitivity to the colorant receiving layer on the portion shielded by the BM or the like between adjacent pixels, and is light-cured. Gives a color repellent property so that the colorant does not penetrate. Therefore, in the present invention, as a resin used as a material for forming the colorant receiving layer, a portion which is photocured by light irradiation shows a color repellent property, and a positive type photosensitive material which does not absorb the colorant in this portion. Resins are preferably used.

In order to expose at least a part of the colorant receiving layer on a light-shielding portion such as a BM, specifically, for example, at least an opening formed by the pattern corresponding to the BM pattern is required. If exposure is performed from the colorant receiving layer side through a photomask that is shielded from light, portions other than the portion that is shielded by the photomask are exposed. As a result, for example, in the example shown in FIG. 1B, the BM opening 15 and a part of the BM light-shielding portion, which are shaded by the photomask, remain colorable and remain as the colored portion 14, whereas in the drawing, Only the portions irradiated with light indicated by oblique lines become non-colored portions 13 having a color repellent property. As described above, if a part of the BM light-shielding portion is left as colorable,
Since the range in which the ink spreads overlaps the light-shielding portion, it is possible to effectively prevent white spots in pixels.

As shown in FIG. 1 (a), the color filter manufactured according to the present invention has an image display area 12 having the above-described structure and a non-pixel having substantially no pixels in the periphery thereof. Although the image display area 11 is composed of a non-pixel part of the image display area 12 which is shielded from light by a BM or the like, the BM or the like is designed to open and transmit light in the pixel part, as shown in FIG. 2), an image display area 12 in which many pixels are densely arranged is formed.

The color filter manufactured according to the present invention has basically the same structure as a normal color filter, but has the image display area 12 formed as described above.
1B, as shown in FIG. 1B, a colored portion 14 including a pixel portion (BM opening) that needs to be colored is surrounded by a non-colored portion 13 for preventing color mixture between pixels. They are lined up in a shape. The non-colored portion 13 is, as described above,
By irradiating at least a part of the colorant receiving layer between the pixels with light, this part is light-cured to impart a color repellent property to a part where the colorant is not absorbed.
As described above, the non-colored portion 1 cured by light irradiation
In No. 3, the adhesion to the base material should have been lower than that of the colored portion 14, but in the image display area 12, as shown in FIG. Since the cured part and the light-cured part exist side by side, and furthermore, the total area of the colored part as a whole is equal to or greater than the total area of the non-colored part, Even when the non-colored portion 13 is formed by irradiating the entire non-pixel portion in the display region 12 with the light, the adhesiveness of the entire image display region 12 is not significantly reduced.

As described above, in the image display area 12 of the color filter, the opening 15 such as a BM is formed corresponding to the pixel portion, whereas the opening 15 is provided around the image display area 12. No opening such as BM is formed in the non-image display area 11. Further, the non-image display area 11 is not colored. However, a part of the non-image display area may be colored due to manufacturing convenience in forming the color filter. Therefore, in the prior art, when a part of the colorant receiving layer is light-cured, the non-image display area is also irradiated with light, and the colorant receiving layer in this part is also cured so that the colorant is not absorbed. It was normal to do.

However, as described above, since there is almost no pixel portion to be colored in the non-image display area 11, when this area is irradiated with light as in the prior art, the non-image display area 11 is cured by light. However, since there is almost no portion having colorant receptivity, the decrease in adhesiveness is apt to be noticeable. Therefore, in the present invention, when forming a pixel portion, a method of applying a colorant only to a necessary portion, such as an ink jet recording system, can be used to accurately apply the colorant to a non-image display. Since it is possible to keep the region 11 from being provided with a coloring agent, the non-image display region 1
The colorant receiving layer 1 is not irradiated with light, the resin as a material for forming the colorant receiving layer is not photocured, and the colorant receiving layer is left as it is without imparting color repellency. I decided that. As a result, it is possible to effectively prevent a decrease in the adhesiveness between the substrate and the colorant receiving layer in the non-image display area 11, which has conventionally occurred. In order to prevent the colorant receiving layer of the image display area 11 from being irradiated with light, specifically,
For example, this portion may be shielded from light by a photomask as shown in FIG. 2 so that the non-image display area 11 is not selectively irradiated with light.

As a material for forming the colorant-receiving layer used in the present invention, it is possible to form a photocured portion as described above for the purpose of preventing color mixing between pixels when a colorant is applied to the pixel later. Because it is required, while being substantially colorless and transparent, it is cured by being exposed to light such as ultraviolet rays, and a resin capable of imparting a color repellent property to the colorant receiving layer in that portion by being cured is used. . Examples of a method of imparting photosensitivity to the resin include a method of using a material having photosensitivity in the resin itself or a method of adding a cationic or other photoinitiator in the resin to impart sensitivity to light. . Since the colorant receiving layer itself used in the color filter is desirably colorless and transparent, in the present invention, ultraviolet light, etc., not visible light, is used as light used when the resin is exposed and the part is cured. . In the present invention, when the resin forming the colorant-receiving layer is cured to impart a color-repellent property to the cured portion, if necessary, the resin is exposed to light and then heated (PE).
B: Post Exposure Bake) may be performed.

Next, the procedure of the method for manufacturing a color filter of the present invention will be described with reference to FIG. FIG. 5 is a process chart conceptually showing an example of a large flow of a manufacturing procedure of the color filter manufacturing method of the present invention. 5, reference numeral 51 denotes a substrate (glass substrate); 52, a black matrix (BM) as a light shielding portion; 53, a resin layer (colorant receiving layer); 54, a photomask; 55, an inkjet recording head; , 57 are light transmitting portions (also referred to as pixel columns), 58 is a non-colored portion, and 59 is a colored portion. or,
The right side of the figure shows the non-image display area 11, and the left side shows the image display area 12.

In the method of manufacturing a color filter according to the present invention, the pixel portion is preferably colored by an ink jet recording method. Here, in the inkjet recording method, it is necessary to eject ink of the same color from one inkjet nozzle. Therefore, paying attention to one nozzle, one-color ink ejection is performed in one drawing main scan in one direction. Therefore, in the present invention, the pixel array including the openings formed by the light shielding portions such as the BMs is arranged in the main scanning direction of the ink jet recording head, and is designed in advance so that the pixel portions can be colored in the same color. Is preferred. A large area pixel array is formed by gathering a plurality of the pixel rows. FIG. 1 shows an example of a stripe pattern as an example.

In the method of manufacturing a color filter of the present invention, first, for example, a BM 52 having a pattern according to a designed pixel arrangement is formed on a substrate 51 made of non-alkali glass (see FIG. 5A). ). As a result, on the glass substrate, in the image display area, a plurality of light transmitting portions 57 in which the pixel portions are formed are opened to form a desired pixel row, and the other portions are shielded from light by the BM. . On the other hand, as shown in FIG. 5A, no BM is provided in the non-image display area because there is no pixel portion.

Next, a resin composition comprising a transparent material having a property of being colored by permeation of a colorant (hereinafter also referred to as ink) and capable of imparting a color repellent property by light irradiation,
The colorant receiving layer 53 is applied on the glass substrate on which the BM pattern 52 is formed by spin coating or the like.
(FIG. 5B).

Next, in order to prevent the ink from protruding to the adjacent pixel portion when the ink is injected into the colorant receiving layer 53 and colored, the plurality of pixel columns 57 and another pixel column are used. At least a part of the colorant receiving layer 53 is irradiated with light along the main scanning direction.
Is cured to form a non-colored portion 58 (FIG. 5C). In the example of FIG. 1, the non-colored portion 58 is formed in a range narrower than the width of the BM which is the light shielding portion. As a method for forming the non-colored portion 58, as shown in FIG. 1 (c), for example, a structure in which ultraviolet rays are transmitted only to the colorant receiving layer 53 corresponding to the non-colored portion 58 to be formed is used. Photo mask 5
UV light is applied to the mask 54 from above the mask 54, and the portion of the colorant receiving layer that has been irradiated with the UV light is photocured. In this way, between adjacent pixel columns,
The non-colored portion 58 having low ink wettability and hardly penetrating the ink is formed.

In the present invention, in this case, the non-image display area 11 is not irradiated with ultraviolet rays.
A photomask 54 for shielding this region from light is used. As a result, the non-image display area 11 is
4, the colorant receiving layer 53 is not exposed to ultraviolet light and is not cured by light, the ink receiving layer 53 is maintained as it is, and ink permeability is maintained.

Next, in the pixel portion of the colorant receiving layer 53 in which a predetermined non-colored portion 58 is formed between the adjacent pixel columns 57 formed as described above, the direction of the pixel column is main-scanned. As the direction, ink is ejected using the ink jet recording head 55 (FIG. 5D). In this figure, the main scanning direction is a direction perpendicular to the recording material. Ink ejection by the ink jet recording method may be performed one color at a time, or may be performed by simultaneously arranging ink jet nozzles for red (R), green (G), and blue (B).

Further, when coloring of necessary pixels is completed,
The entire surface of the color filter is heat cured to fix the colorant.
(FIG. 5E). At this time, light irradiation is supplemented in addition to heat curing.
It can be used as an auxiliary curing means. Furthermore,
In the method for producing a color filter of the present invention,
A transparent protective layer 56 is appropriately formed thereon by a suitable method such as coating.
(FIG. 5F).

In the method for producing a color filter of the present invention, as a material for forming a colorant receiving layer, after the receiving layer is formed, it can be colored by an ink jet recording method or the like, and can be irradiated with substantially transparent light. A material capable of forming a non-colored portion by imparting a color repellent property is used. When the colorant receiving layer is formed on the substrate, the above-described material is uniformly applied to the substrate by a method such as spin coating to form the colorant receiving layer. Examples of the material for forming the colorant-receiving layer having the above-mentioned properties include the following resins.

(A) A polymer of a monomer alone comprising a structural unit represented by the following structural formula (I) and / or a copolymer of the above monomer and another vinyl monomer And (B) a resin having at least one of a halogenated triazine compound, a diphenyliodonium salt derivative and a triphenylsulfonium salt derivative.

Embedded image (In the formula (I), R ₁ represents a hydrogen atom or a methyl group, R ₂
Represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. )

Examples of the monomer comprising the structural unit represented by the structural formula (I) described in the above (A) include N-methylolacrylamide, N-methoxymethylacrylamide, N-ethoxymethylacrylamide, Isopropoxymethyl acrylamide, N-methylol methacrylamide, N-methoxymethyl methacrylamide, N
-Ethoxymethyl methacrylamide and the like,
It is not limited to these. As a material for forming the colorant-receiving layer used in the present invention, a polymer obtained by polymerizing a monomer composed of the structural unit represented by the above structural formula (I) alone or other polymer described below is used. A copolymer obtained by copolymerizing with a vinyl monomer is used.

Examples of other vinyl monomers that can be used at this time include acrylic acid esters such as acrylic acid, methacrylic acid, methyl acrylate, and ethyl acrylate; and methyl methacrylate and ethyl methacrylate. Methacrylic acid esters; hydroxymethyl methacrylate,
A vinyl monomer having a hydroxyl group such as hydroxyethyl acrylate; other, styrene, α-methylstyrene,
Examples thereof include, but are not limited to, acrylamide, methacrylamide, acrylonitrile, acrylamine, vinylamine, vinyl acetate, and vinyl propionate.

In the present invention, a resin having the above-mentioned polymer and / or copolymer and the compound mentioned in (B) is used as the colorant-receiving layer. At this time, the content of the compound (B) in the resin is preferably about 0.01 to 10% by weight based on the total amount of the resin. The compound described in (B) functions as a photoinitiator when the polymer and / or copolymer described in (A) is photopolymerized and cured. In the present invention, by adding the compound mentioned in (B) to the material for forming the colorant receiving layer, a desired portion of the colorant receiving layer is irradiated with light, and the portion is selectively repelled. A color mixing prevention process is performed between pixels by imparting an agent property.

Hereinafter, specific examples of the compounds described in the above (B) will be described. Examples of the halogenated triazine compound, which is one of the compounds described in (B), include a compound represented by the following general formula (II).

Embedded image (In the formula (II), Y represents CZ ₃ , phenyl, halogenated phenyl or another substituent, and Z represents a halogen atom.) Specifically, for example, 6-bis (trichloromethyl) -S
-Triazine, 2-styryl-4,6-bistrichloromethyl-S-triazine, and other compounds, but are not limited thereto.

The diphenyliodonium salt derivative which is another one of the compounds of (B) includes a compound represented by the following general formula (III).

Embedded image (In the formula (III), R ₄ and R ₅ represent a hydrogen atom and a carbon number of 1 to
5 represents an alkoxy group or t- butyl group, X ^- is, B
Represents F ₄ ⁻ , PF ₆ ⁻ , SbF ₆ ⁻ or CF ₃ SO ₃ ⁻ . Specific examples include, but are not limited to, compounds such as diphenyliodonium hexafluoroantimonate and diphenyliodonium tetrafluoroborate.

The triphenylsulfonium salt derivative, which is still another one of the compounds (B), includes a compound represented by the following formula (IV).

Embedded image (In the formula (IV), R ₆ represents a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms, —SPh or a fluorine atom, and X ⁻ represents the case of the formula (III). Specific examples include, but are not limited to, compounds such as triphenylsulfonium hexafluoroantimonate and triphenylsulfonium hexafluoroborate.

The colorant-receiving layer formed by uniformly applying a composition for a colorant-receiving layer made of the above-mentioned materials on a substrate is provided with a colorant when an ink for ink-jet recording or the like is applied. Absorbed and colored. In the present invention,
A part of the colorant receiving layer is light-cured with ultraviolet light or the like before coloring in order to impart a color repellent property for the purpose of preventing color mixing. That is, in the light-irradiated portion of the colorant-receiving layer, the monomer or the like as described in (A) above, which is a material for forming the colorant-receiving layer, is reacted with the photopolymerization initiator as described in (B). Polymerization causes a cross-linking reaction and the like, so that the dye molecules of the colorant hardly move, and the OH groups are reduced, so that the colorant is easily repelled and the color repellent property appears. As a result, the light-irradiated portion of the colorant receiving layer becomes a region where the colorant is hardly soaked and hardly wetted. This makes it difficult for the colorant to diffuse and move to the light-irradiated region of the colorant receiving layer, and an effect of preventing color mixing is obtained. As a coating method for forming the colorant receiving layer, for example, a spin coating method capable of forming a uniform film, a roll coating method, a bar coating method, a dip coating method, or the like can be used.

Various substrates can be used for the color filter manufacturing method of the present invention depending on the use of the color filter. For a liquid crystal display, a transparent glass substrate or a plastic substrate is used. Can be Further, as the light-shielding portion provided on such a substrate, a BM layer having various patterns may be formed, or a wiring used for driving liquid crystal of the pixel may be used. As a method of forming the BM layer, for example, a method of forming a metal film on a substrate by a film forming method such as sputtering or vacuum evaporation and then patterning an opening or the like by a photolithography process, or a method of applying a black resin and then applying a photolithography method And a method of forming by a printing method.

In the method for producing a color filter of the present invention, the method of coloring the pixel portion is not particularly limited, but it is preferable to color the fine pixel by an ink jet recording method in order to accurately apply a desired coloring agent to fine pixels. . As an inkjet recording method suitable for the present invention, for example,
Examples of the energy generating element include an element using an electrothermal converter (a so-called bubble jet type) and a piezo jet type using a piezoelectric element. According to these ink jet recording methods, a coloring area and a coloring pattern can be arbitrarily set, so that the present invention is suitable for the present invention in which a pixel portion having a fine pattern needs to be colored in a desired manner. Specifically, see, for example,
An ink jet recording method as disclosed in JP-A-75202 and JP-A-8-75916 is preferable. Dye-based inks and pigment-based inks are used as coloring agents for coloring the pixel portion. They can be used together, and both liquid ink and solid ink can be used.

As a display on which a color filter manufactured by the method for manufacturing a color filter of the present invention can be mounted, a normal TN liquid crystal, a device having an improved threshold value characteristic called a so-called STN, a switching element such as a TFT or the like is provided for each pixel. Examples include an attached active matrix type, a type using a ferroelectric liquid crystal, and the like, and are not particularly limited. The color filter is generally installed inside the two substrates to which the liquid crystal panel is attached. However, the color filter may be installed outside the substrate, and there is no particular limitation on the installation position of the color filter. Further, the pixel pattern of the color filter manufactured by the present invention may be any pattern as long as the pixels are arranged in the main scanning direction. Further, as the pixel shape, any shape such as a rectangle, a square, a triangle, and a circle may be used as long as all the pixels can be arranged uniformly.

[0041]

Next, the present invention will be described more specifically with reference to examples and comparative examples. Example 1 In this example, a mosaic color filter for a liquid crystal display device was formed on a glass substrate. First, a metal Cr was deposited on a glass substrate by sputtering at a thickness of 700Å.
Then, a BM for inter-pixel light shielding having a pixel portion opened as shown in FIG. 3 was formed by a photolithography method. The size of one opening is 80 × 250 μm, and the pixel pitch of the same color is 300 μm. The distance between adjacent pixels of different colors was 100 μm.

Next, the aforementioned structural formula (I) (R ₁ = H, R
₂ = H) to an acrylic resin whose main component is triphenylhexafluoroantimonate, added to the resin in an amount of 4% by weight, and dissolved in an ethyl cellosolve solvent. The resulting BM was applied to a thickness of about 1 μm by spin coating and dried at 50 ° C. for about 30 minutes. After drying, a portion corresponding to the non-image display area in the peripheral portion is shielded from light as shown in FIG. 2, and a non-colored portion formed around the pixel portion in the central image display area as shown in FIG. Exposure is performed with ultraviolet light having a wavelength of 290 nm or less through a photomask in which only a portion is irradiated with light.
By performing B heating (post exposure bake), a non-colored portion having a color repellent property was formed only around the pixel portion in the image display region.

Next, three types of colorants, red (R), green (G) and blue (B), were injected into the above-mentioned pixel portion according to the original design by the ink jet method. The colorant was absorbed by the pixel portion, but was repelled in the non-colored portion formed around the pixel portion, and did not leak to adjacent pixels, and thus no color mixing occurred. On the other hand, the non-image display area around the image display area was not light-cured, but ink was not injected into this area, so that, of course, no color mixing occurred, and the light was blocked by the BM. There was no transmission. After driving the coloring agent into the colored part,
The film was dried at 0 ° C. for 30 minutes, and further heated at 200 ° C. for 1 hour to thermally cure even the portion not irradiated with light. This cured the entire colorant receiving layer. This was washed with water, dried, and coated with an acrylic resin at about 1 μm to form a protective layer, thereby completing a color filter.

When the adhesion between the colorant receiving layer and the substrate in the non-image display area around the color filter formed as described above was evaluated by a tape test, no peeling occurred. In addition, this color filter was a good color filter for use in a liquid crystal display, with no color mixture between the colors and uniform density. Using this color filter, a liquid crystal cell was laminated on the pixel according to a conventional method, and a transmission type display was manufactured to display an image. As a result, a very good image was obtained.

Example 2 In the same manner as in Example 1, a mosaic color filter for a liquid crystal display was formed on a glass substrate. However, in the present embodiment, as shown in FIG. 4, the photomask used for photo-curing of the non-colored portion can shield only the pixel portion of the image display region, Since a conventional light-shielding device that does not shield light was used, a light-shielding plate for shielding light from the non-image display area was placed on a photomask provided in the exposure apparatus to shield the non-image display area. Otherwise, a color filter was completed in the same procedure as in Example 1. When the adhesion between the colorant receiving layer and the substrate was checked for the obtained color filter, it showed an extremely good adhesion strength.

Comparative Example 1 A color filter was formed in the same procedure as in Example 1 using the conventional photomask used in Example 2. That is, light irradiation was performed without using the light-shielding plate used to shield the non-image display area around the color filter used in Example 2, and the non-image display area was also irradiated with light and light-cured. Thereafter, coloring of the pixel portion, fixing of the coloring agent by heat curing, and application of the protective layer were performed in the same manner as in Example 1 to complete a color filter for comparison.

The adhesion between the substrate and the colorant receiving layer of the obtained color filter was measured by a tape peeling test. As a result, film peeling was observed in a part of the non-image display area around the color filter. This film peeling progressed from the peripheral portion of the color filter to the image display region with the pixel portion along the direction in which the tape was peeled, and partially progressed to the region with the colored pixel portion separated by the non-colored portion, Peeling stopped when the colored pixel portion entered an area. Furthermore, when observing this part with an optical microscope,
In the non-image display area where the colored portion does not exist, the film peeling occurs, and after the film peeling proceeds to the image display area having the colored pixel portion, the colored pixel portion remains without peeling, and then about 100
When the film entered into the image display area by about μm, the peeling of the film also stopped at the non-colored portion between the colored portions. From this, the colored portion (that is, the non-colored portion)
It was confirmed that the presence of the (unexposed portion) suppressed the peeling of the non-colored portion.

[0048]

As described above, according to the method for manufacturing a color filter of the present invention, a color filter having significantly improved adhesion between the colorant receiving layer and the substrate is provided. Therefore, according to the present invention, it is possible to improve the production yield of the liquid crystal display device.

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire color filter of the present invention.

FIG. 2 is a diagram illustrating an example of a photomask used for a color filter of the present invention.

FIG. 3 is a diagram illustrating an example of a combination of a color portion, a non-color portion, and a BM of the color filter of the present invention.

FIG. 4 is a diagram illustrating an example of a photomask used for a conventional color filter.

FIG. 5 is a view schematically showing a process of manufacturing the color filter of the present invention.

[Explanation of symbols]

 11, 21, 41: Non-image display area 12, 22, 42: Image display area 13: Non-colored part 14: Colored part 15: BM opening 51: Substrate (glass substrate) 52: Black matrix (BM) 53: Resin Layer (colorant receiving layer) 54: Photomask 55: Inkjet head 56: Protective layer 57: Light transmitting portion 58: Non-colored portion 59: Colorant receiving region

Claims (2)

[Claims] When manufacturing a color filter in which an image display region having at least a light-shielding portion and a colored pixel portion and a non-image display region disposed around the image display region are provided on a transparent substrate. After applying a substantially transparent material to which a color repellent property is imparted by light irradiation onto a transparent substrate to form a colorant receiving layer on the entire surface of the substrate, a part of the colorant receiving layer is irradiated with light. To impart a color repellent property to the light-irradiated portion, and then supply a colorant to the colorant-receiving layer in the image display area to form a colored pixel portion. The method for producing a color filter, wherein the colorant receptivity is left without imparting the color repellent property to the non-image display area without performing the above process on the non-image display area. 2. The method for producing a color filter according to claim 1, wherein the supply of the coloring agent to the colored pixel portion is performed by an ink jet recording method.