Source: https://patents.google.com/patent/US6815125B1/en
Timestamp: 2018-11-15 21:34:31
Document Index: 772915421

Matched Legal Cases: ['art 4', 'art 4', 'arts 4', 'art 4', 'art 5', 'arts 4', 'art 5', 'art 5', 'art 4', 'art 5', 'arts 4', 'art 4', 'arts 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 6', 'art 12', 'art 8', 'art 4', 'art 4', 'art 11', 'art 11', 'art 12', 'art 12', 'art 12', 'art 12', 'art 12', 'art 13', 'arts 12', 'art 11', 'art 14', 'art 14', 'arts 14', 'art 14', 'arts 12', 'art 14', 'arts 12', 'art 12', 'art 11', 'arts 12', 'arts 12', 'art 15', 'art 16', 'art 17', 'art 16', 'art 17', 'art 5', 'art 5', 'art 5', 'art 4', 'art 5', 'art 15', 'art.\n2', 'art 4', 'art 4', 'art 4', 'art 4', 'art.\n3', 'art.\n2', 'art.\n16']

US6815125B1 - Color filter and process for producing the same - Google Patents
Color filter and process for producing the same Download PDF
US6815125B1
US6815125B1 US09607010 US60701000A US6815125B1 US 6815125 B1 US6815125 B1 US 6815125B1 US 09607010 US09607010 US 09607010 US 60701000 A US60701000 A US 60701000A US 6815125 B1 US6815125 B1 US 6815125B1
US09607010
There is provided a color filter without a shading part, which comprises a transparent substrate, a picture element part provided on the transparent substrate by the predetermined pattern of a plurality of colors with an ink jet system, and a wettability-variable layer, in which the wettability can be changed, provided for forming the picture element part.
In addition, as a method for producing a color filter by forming a colored layer with an ink jet system, there is described a method of forming a colored layer (picture element part) by providing an ink absorbing layer on a substrate and making a difference in the ink absorbability of this absorbing layer between an exposed part and an unexposed part in JP-A-8-230314 and JP-A-8-227012. However, in this method, since a colored layer is formed by forming an absorbing layer and absorbing an ink in this absorbing layer, there is a problem that a difference in the coloration between a central part of an ink dot and a surrounding part of that is present which results in the color nonuniformity. In addition, there is also a problem that this absorbing layer needs the predetermined thickness resulted from its function of absorbing an ink.
On the other hand, in a color filter, a shading part called as a black matrix is generally provided on a boundary portion of a picture element part. The shading part generally formed on the side of color filter. However, in case of using as a liquid crystal panel, there are some cases that the shading part is formed on the side of a substrate opposite to the color filter. When the shading part is formed on the side of a substrate opposite to the color filter, a color filter in which a shading part is not provided, is formed. The above-described problems also occur in the color filter which do not has a shading part.
The present invention was done in view of the above problems and a main object thereof is to provide a color filter which do not have a shading part, in which a part having the better wettability and a part having the worse wettability can be formed on a single layer regarding the wettability of a substrate which becomes problematic upon formation of a picture element part with an ink jet system, and a pattern formed of the part having the better wettability and the part having the worse wettability can be formed in a few steps and, further, an ink absorbing layer is not necessary, and which has the better quality and which can be produced with the low cost, and a process for producing the same.
In order to attain the aforementioned object, the present invention provides a color filter which comprises a transparent substrate, a picture element part in which a plurality of colors are provided in the predetermined pattern with an ink jet system on the transparent substrate, and a wettability-variable layer being capable of varying the wettability which is provided for forming the picture element part.
As described above, the present invention is characterized in that it has a wettability-variable layer in order to form a picture element part. Therefore, by utilizing the change in the wettability of a wettability-variable layer, a picture element part can be formed with the better precision, and a high quality color filter having no problem such as color missing and color nonuniformity can be provided.
In this case, the construction may be such that the wettability-variable layer is provided on the transparent substrate, and the picture element part is provided on the wettability-variable layer. By forming such a construction, a wettability-variable layer of a part on which a picture element part is formed can be made to be an inkphilic region having a small contact angle with a liquid in advance, and the other part of the wettability-variable layer can be made to be an ink-repellent region having a large contact angle with a liquid. By coloring the inkphilic region where the picture element part is formed, with an ink jet system, an ink is adhered to only the inkphilic region having a small contact angle with a liquid. Accordingly, the ink is applied uniformly within the whole surface of the picture element part. Therefore, a color filter having no disadvantage such as color nonuniformity and color missing can be provided.
In the present invention, it is preferable that a space (distance) between the picture element parts is not more than 2 μm. Since a color filter of the present invention does not have a black matrix (shading part), when actually using for a liquid crystal panel, it is necessary to use together with a back light side substrate having a black-matrix. In this case, when a space between picture element parts is wide, it is necessary to have a high precision concerning positioning with the back light side substrate which has a black matrix. If it is not so, a back light penetrates the space between the picture element parts, as a result, the so-called color missing may occur. Accordingly, it is preferable that the space between the picture element parts is as small as possible, concretely, it is preferable that the space between the picture element parts is not more than 2 μm. Further, a colored layer consisting of the picture element parts can obtain surface smoothness if the space between the picture element parts is small like that.
In the present invention, an ink-repellent convex part may be formed on a surface of a wettability-variable layer at a boundary portion of the picture element part. Since an ink-repellent convex part is formed on a boundary portion between the picture element parts forming portions when the picture element part is formed by adhering an ink with an ink jet system, the disadvantages such as mixing of inks during coloring, do not occur, being preferable.
On the other hand, in the present invention, the construction may be such that the picture element part is provided on the transparent substrate, and the wettability-variable layer is provided on a border portion between the picture element parts.
In this case, by making the wettability of a wettability-variable layer on a border part of a picture element part, an ink-repellent region having the larger contact angle with a liquid than that of a part on a transparent substrate, on which a picture element part is to be formed, since it is difficult for an ink to migrate over a border part of a picture element part having ink-repellent properties upon coloring a part on which a picture element part is to be provided (picture element part forming portion) with an ink jet system, a color filter having no disadvantages such as ink mixing and the like can be provided. In addition, by making a wettability-variable layer of a border part of a picture element part an inkphilic region having the small contact angle with a liquid thereafter, covering the whole with a protecting layer can be easily carried out and, thus, a color filter having the high quality can be obtained.
In this case, it is preferable that the wettability on the transparent substrate is less than 10 degrees in terms of the contact angle with a liquid having the surface tension of 40 mN/m. This is because, when an ink is adhered to the picture element part forming portion on the transparent substrate with an ink jet system, the ink for the picture element part is uniformly spread with a picture element part forming portion, the better-quality color filter having no disadvantages such as color nonuniformity and the like can be provided.
In the present invention, it is preferable that the wettability-variable layer is a photocatalyst-containing layer comprising at least a photocatalyst and a binder, and having the wettability which varies so that the contact angle with a liquid is decreased by,irradiation with the energy.
Like this, by forming a photocatalyst-containing layer having the wettability which varies so, that the contact angle with a liquid is decreased by irradiation with the energy, the wettability of this layer can be varied by performing the pattern irradiation of the energy and the like and an inkphilic region having the small contact angle with a liquid can be formed easily and, for example, it becomes possible to easily make only a part on which a picture element part is formed into an inkphilic region. Accordingly, when a shading part is not provided between the picture element parts, the picture element part can be easily formed, and a color filter without a shading port can be manufactured effectively.
The photocatalyst comprised in the photocatalyst-containing layer, is preferably one or more selected from the group consisting of titanium oxide (TiO2), zinc oxide (ZnO), tin oxide (SnO2), strontium titanate (SrTiO3), tungsten oxide (WO3), bismuth oxide (Bi2O3), and iron oxide (Fe2O3). Inter alia, titanium oxide (TiO2) is preferable. This is because since titanium oxide has the high band gap energy, it is effective as a photocatalyst, is chemically stable, has no toxicity and is easily available.
A liquid crystal panel having the aforementioned color filter and a opposite substrate having a shading part, and which is obtained by encapsulating a liquid crystal compound between both substrates, has the advantages of the aforementioned color filter, that is, the advantages that color missing and color nonuniformity of a picture element part are not present and it is advantageous in a respect of cost.
In order to attain the aforementioned object, the present invention provides a process for production of a color filter, which comprises steps: (1) a step of providing a photocatalyst-containing layer having the wettability of the energy-Irradiated part which changes in a direction of reduction of the contact angle with a liquid, on a transparent substrate, (2) a step of forming an exposed part for a picture element part by pattern-irradiating with the energy on a picture element part forming portion on which the picture element part, on the photocatalyst-containing layer formed on the transparent substrate, is to be formed, and (3) a step of coloring the exposed part for a picture element part with an ink jet system, to form a picture element part.
In a process for producing a color filter in the present invention, by providing a photocatalyst-containing layer on a transparent substrate and irradiating this photocatalyst-containing layer with the energy, an exposed part for a picture element part, on which the contact angle with a liquid of the energy-irradiated part is reduced, can be formed. By coloring the exposed part for a picture element part with an ink jet system, the picture element part can be easily formed. Accordingly, it is possible to form the picture element part with the ink jet system with advantageous in a respect of cost even if there is no shading part on the transparent substrate.
Further, in the present invention, the step of forming an exposed part for a picture element part, then coloring the part with an ink jet system to form the picture element part, may comprise steps; (a) a step of forming a exposed part for a first picture element part by pattern-irradiating with the energy on a part of a picture element part forming portion on which the picture element part, on the photocatalyst-containing layer, is to be formed, (b) a step of forming a first picture element part by coloring the exposed part for a first picture element part with the ink jet system, (c) a step of forming a exposed part for a second picture element part by irradiating with the energy on a remaining part of a picture element part forming portion on which the picture element part, on the photocatalyst-containing layer, is to be formed, and (d) a step of forming a second picture element part by coloring the exposed part for a second picture element part with the ink jet system.
When a picture element part is formed on a transparent substrate without a shading part, it is not possible to use the shading part as a partition during coloring a picture element part. Therefore, in case of forming a picture element part through coloring a exposed part for a picture element part converted to inkphilic region by irradiating with the energy, and when a space between the exposed parts for a picture element part is narrow, that is, when a width of an ink-repellent region not exposed is narrow, there are some possibilities of mixing some sorts of ink for adjacent picture element parts through migration over an ink-repellent region during forming a picture element part. Accordingly, it is desirable to form adjacent picture element parts as apart as possible during formation of the picture element part. As described above, when the method such that the second picture element part is formed after the first picture element part is formed, is employed, the adjacent picture element parts can be formed on apart positions each other during formation of the first picture element part because the energy can be pattern-irradiated such that the picture element part is formed alternately during formation of the first picture element part. Since the exposed part for a first picture element part is formed the condition such that relatively wide ink-repellent region exist between the colored regions, like that, and is colored with an ink jet system, there is no possibility of mixing some sorts of ink for adjacent picture element parts. Then, the exposed part for a second picture element part is formed though exposing again between the first picture element parts formed like that, and then is colored with the ink jet system, as a result a color filter which do not have deficiency such as ink mixing, can be obtained. Further, concerning a color filter which do not have a shading part, there are some demands such that no space exist between picture element parts. In this case, it is necessary to employ the method such that the formation of picture element parts divides into two times, described above.
In the present invention, an exposed part for an ink-repellent convex part where an ink-repellent convex part is to be formed, may be formed before formation of the exposed part for a picture element part, and then an ink-repellent convex part may be formed on the exposed part for an ink-repellent convex part through using resin composition. By forming an ink-repellent convex part like this, for example, when the ink-repellent convex part is formed around the region where a picture element part is to be formed, it is possible to prevent the problem such that a picture element part can not be formed precisely because ink flows out at the portion around a color filter. In this invention, particularly, it is preferable to form the ink-repellent convex part between the picture element parts. It is the reason to do so that the above mentioned problem, that is, mixing some sorts of ink for adjacent picture element parts, become hardly to occur.
Further, the present invention provides a process for production of a color filter, which comprises steps: (1) a step of providing a photocatalyst-containing layer having the wettability of the energy-irradiated part which changes in a direction of reduction of the contact angle with a liquid, at a boundary portion of a picture element part forming portion on which the picture element part is to be formed, on a transparent substrate, (2) a step of forming the picture element part on the picture element part forming portion on the transparent substrate.
According to this method, first, a photocatalyst-containing layer is provided at the boundary portion of the picture element part on the transparent substrate. When the material which has larger contact angle with a liquid before irradiating the energy than that of a surface of the transparent substrate, is employed to the photocatalyst-containing layer, the picture element part forming portion is an inkphilic region which has smaller contact angle with a liquid than that of the boundary portion on which the photocatalyst-containing layer is formed. Accordingly, the boundary portion of the picture element part forming portion acts as an ink-repellent region. Thus, when ink is adhered to the picture element part forming portion which is an inkphilic region, with an ink jet system in the next step, the adhered ink does not migrate beyond the boundary portion which acts as an ink-repellent region. Hence, it is difficult to generate the problem such as ink mixing during formation of a color filter.
Further, in this case, it is preferable that the wettability on the transparent substrate is less than 10 degrees as a contact angle with a liquid having the surface tension of 40 mN/m. Since the wettability of the surface of the transparent substrate is inkphilic, an ink is uniformly and evenly spread when an ink is adhered on a transparent substrate with an ink jet system. Thus, color missing and color nonuniformity do not generate, and a color filter having the high quality can be obtained.
FIG. 4 is a process drawing for explaining the third embodiment of a process for producing the color filter according to the present invention.
FIG. 5 is a process drawing for explaining an another example of the third embodiment of a process for producing the color filter according to the present invention.
FIG. 6 is a schematic plan view showing the first picture element part and the second picture element part in a process for producing showing in FIG. 5.
FIG. 7 is a schematic plan view showing the examples of a photomask using in the process for producing the color filter according to the present invention.
FIG. 8 is a process drawing for explaining an another example of the third embodiment of a process for producing the color filter according to the present invention.
FIG. 9 is a process drawing for explaining the forth embodiment of a process for producing the color filter according to the present invention.
First, the color filter according to the present invention is explained. The color filter according to the present invention comprises a transparent substrate, a picture element part in which a plurality of colors are provided in the predetermined pattern with an ink jet system on the transparent substrate, and a wettability-variable layer being capable of varying the wettability which is provided for forming the picture element part.
The present invention has a wettability-variable layer in order to form a picture element part as described above. Therefore, since a picture element part can be easily formed by varying the wettability of a wettability-variable layer, a color filter having the high quality can be obtained at the low cost. “In order to form a picture element part” herein includes the meaning that a picture element part is positioned on a transparent substrate.
The first embodiment of the present invention is a color filter in which the picture element part is provided on the predetermined portion on the wettability-variable layer which is formed on the transparent substrate. This shows an example of a color filter in which a picture element part is positioned through a wettability-variable layer.
In the present embodiment, a picture element part is provided on a wettability-variable layer being capable of varying the wettability in a color filter without a shading part. Therefore, the wettability of a part on which a picture element part is to be provided in advance can be made into an inkphilic region having the small contact angle with a liquid and the other part can be made into an ink-repellent region having the large contact angle with a liquid. Since an ink is adhered to only an inkphilic region having the small contact angle with a liquid by coloring the picture element part forming portion on which a picture element part is to be provided, with an inkjet system, in spite of a surface of a transparent substrate without a shading part, an ink is uniformly spread over the whole picture element part, and a region having no ink is not present and color nonuniformity and the like do not occur in a picture element part, and an ink is not adhered to the other ink-repellent region.
One example of the color filter according to the first embodiment like this is explained using some drawings.
FIG. 1 shows one example of a color filter of the present embodiment. This color filter 1 comprises a wettability-variable layer 3 formed on a transparent substrate 2, and a picture element part 4 having three color parts of red(R), green(G), and blue(B) formed on the wettability-variable layer 3. In a color filter of the present embodiment, an protecting layer may be formed on the picture element part 4 as needed.
In a color filter of the present embodiment, it is preferable that a space between the picture element parts 4 is narrow. Since a color filter of the present embodiment is a type of color filter in which a black matrix (shading part) is not provided, when actually using for a liquid crystal display, it is necessary to use together with a back light side substrate having a black-matrix. In this case, when a space between the picture element parts is wide, it is necessary to have a high precision concerning positioning with the back light side substrate on which the black-matrix is provided. If it is not so, a back light penetrates the space between the picture element parts, as a result, the so-called color missing may occur so it is not preferable.
Further, there is an advantage such that a colored layer consisting of the picture element parts can be smoothness through that the space between the picture element parts is narrow like that. In the present embodiment, concretely, it is preferable that a distance between the picture element parts is not more than 2 μm, particularly, not more than 1 μm. If necessary, there may be no space between the picture element parts of the color filter in the present invention.
FIG. 2 shows an another example of a color filter of the present embodiment. In this example, similar to the example showing in FIG. 1, a color filter comprises a wettability-variable layer 3 formed on a transparent substrate 2, and a picture element part 4 formed on the wettability-variable layer 3. Further, an ink-repellent convex part 5 which has an ink-repellent property, is formed on a portion between the picture element parts 4. Since an ink-repellent convex part 5 is formed in a color filter 1 of this example like this, an ink is not flown out over this ink-repellent convex part 5 upon adhering an ink to a picture element part forming portion with an ink jet system and, thus, a color filter having a picture element part which does not mix with an ink of an another color can be obtained.
As such the anatase-type titanium oxide, mention may be made of hydrochloric acid-defloccuated-type anatase-type titania so1 (STS-02 (average particle size 7 nm) manufactured by Ishihara Sangyo Kaisha, LTD., ST-KO1 manufactured by Ishihara Sangyo Kaisha, LTD.), and nitric acid-defloccuated-type anatase-type titania so1 (TA-15 (average particle size 12 nm) manufactured by Nissan Chemical Industries, Ltd.).
Further, in such the color filter, it is preferable that the fluorine content in an inkphilic region formed by the pattern irradiation of the energy is such that fluorine (F) element is contained at a rate of not greater than 50, preferably not greater than 20, particularly preferably not greater than 10 relative to 100 of titanium (Ti) element.
More particularly, there can be used
methyltrichlorsilane, methyltribromsilane, methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, methyltri-t-butoxysilane;
ethyltrichlotsilane, ethyltribromsilane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyltriisopropoxysilane, ethyltri-t-butoxysilane;
n-propyltrichlorsilane, n-propyltribromsilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, n-propyltriisopropoxysilane, n-propyltri-t-butoxysilane;
n-hexyltrichlorsilane, n-hexyltribromsilane, n-hexyltrimethoxysilane, n-hexyltriethoxysilane, n-hexyltriisopropoxysilane, n-hexyltri-t-butoxysilane;
n-decyltrichlorsilane, n-decyltribromsilane, n-decyltrimethoxysilane, n-decyltriethoxysilane, n-decyltriisopropoxysilane, n-decyltri-t-butoxysilane;
n-octadecyltrichlorsilane, n-octadecyltribromsilane, n-octadecyltrimethoxysilane, n-octadecyltriethoxysilane, n-octadecyltriisopropoxysilane, n-octadecyltri-t-butoxysilane;
phenyltrichlorsilane, phenyltribromsilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyltriisopropoxysilane, phenyltri-t-butoxysilane, tetrachlorsilane, tetrabromsilane, tetramethoxysilane, tertaethoxysilane, tetrabutoxysilane, dimethoxydiethoxysilane;
dimethyldichlorsilane, dimethyldibromsilane, dimethyldlmethoxysilane, dimethyldiethoxysilane;
diphenyldichlorsilane, diphenyldibromsilane, diphenyldimethoxysilane, diphenyldiethoxysilane;
phenylmethyldichlorsilane, phenylmethyldibromsilane, phenylmethyldimethoxysilane, phenylmethyldiethoxysilane;
trichlorhydrosilane, tribromhydrosilane, trimethoxyhyrosilane, triethoxyhydrosilane, triisopropoxyhydrosilane, tri-t-butoxyhydrosilane;
vinyltrichlorsilane, vinyltribromsilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriisopropoxysilane, vinyltri-t-butoxysilane;
trifluoropropyltrichlorsilane, trifluoropropyltribromsilane, trifluoropropyltrimethoxysilane, trifluoropropyltriethoxysilane, trifluoropropyltriisopropoxysilane, trifluoropropyltrl-t-butoxysilane;
γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltriisopropoxysilane, γ-glycidoxypropyltri-t-butoxysilane;
γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, γ-methacryloxypropyltriisopropoxysilane, γ-methacryloxypropyltri-t-butoxysilane;
γ-aminopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltriisopropoxysilane, γ-aminopropyltri-t-butoxysilane;
γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropylmethyldiethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-mercaptopropyltriisopropoxysilane, γ-mercaptopropyltri-t-butoxysilane;
β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltriethoxysilane;
and partial hydrolysate thereof; and mixture thereof.
In the present invention, a picture element part 4 is provided on a wettability-variable layer 3, inter alia, the aforementioned photocatalyst-containing layer as shown in FIG. 1 and FIG. 2. In the present invention, a picture element part is formed in an inkphilic region which is formed by exposing the aforementioned photocatalyst-containing layer, having the low contact angle with a liquid in the predetermined pattern by a plurality of colors of inks with an ink jet system. A picture element part is usually formed of three colors of red (R), green (G) and blue (B). The coloring pattern and an area to be colored in this picture element part can be set arbitrarily. In a color filter of the present invention, a shading part (a black matrix) does not exist between picture element parts. Therefore, two cases can be found, one of which is the case in which a space exist between picture element parts, and another of which is the case in which a picture element part is formed continuously. In the present embodiment, either one may be acceptable. Further, as showing in FIG. 2, it is acceptable that an ink-repellent convex part is provided.
In the first embodiment of the present invention, the wettability-variable layer 3, inter alia, the aforementioned photocatalyst-containing layer is provided on a transparent substrate 2 as shown in FIG. 1 and FIG. 2.
In the first embodiment of the present invention, an ink-repellent convex part 5 may be formed between picture element parts 4 as shown in FIG. 2. The composition of such the ink-repellent convex part is not particularly limited as long as it is a resin composition having the ink-repellent properties. In addition, the composition is not necessarily transparent and may be colored. For example, a material which is used for a black matrix (shading part) and which is a material with no black material incorporated therein can be used. More particularly, mention may be made of a composition of a water soluble resin such as polyacrylamide, polyvinyl alcohol, gelatin, casein, cellulose and the like alone or a mixture of two or more of them, and a resin composition such as O/W emulsion, for example, an emulsified reactive silicone. In the present invention, a photocuring resin is suitable used for the reasons of easy handling and curing. In addition, since this ink-repellent convex part is preferable as it grows ink-repellent, the surface thereof may be treated with an ink-repellent treating agent such as a silicone compound and a fluorine-containing compound.
A protecting layer may be further formed on a surface of a color filter 1 as the occasion demands though not shown in FIG. 1 or FIG. 2. This protecting layer is provided for flattening a color filter and at the same time preventing components contained in a picture element part, or a picture element part and a photocatalyst-containing layer from dissolving into a liquid crystal layer.
The second embodiment of the present invention is a color filter in which a picture element part is formed on a transparent substrate, and the wettability-variable layer is formed on a boundary portion of the picture element parts. This shows the other example of a color filter in which a picture element part is positioned through a wettability-variable layer FIG. 3 shows one example of the second embodiment. This color filter 1 is formed of a transparent substrate 2, a picture element part 4 formed on the transparent substrate 2, and a wettability-variable layer 3 formed between the picture element parts 4. A protecting layer not shown in the drawings may be provided on the picture element part 4 and the wettability-variable layer 3 as the occasion demands.
The characteristics of this embodiment are in that a wettability-variable layer 3 is provided on only a boundary portion of a picture element part 4 on a transparent substrate 2 and a picture element part 4 is formed on the transparent substrate 2 directly. Since, in the second embodiment, a wettability-variable layer 3 is formed on only a boundary portion of a picture element part 4 like this, when the wettability is changed by adding the stimulation to a wettability-variable layer 3, the stimulation may be added over the whole side and the stimulation does not necessarily be added in a pattern like state. Therefore, there are effects that steps after formation of a wettability-variable layer may be simplified.
In this embodiment, since a picture element part 4 is provided just on a transparent substrate 2, it is preferable that a surface of a transparent substrate 2 is inkphilic. In particular, when a wettability-variable layer 3 is formed in a pattern like state and, thereafter, a picture element part 4 is formed on a picture element part forming portion therebetween, it is preferable that a surface of a transparent substrate 2 is an inkphilic region compared with a wettability-variable layer 3 which is an ink-repellent region before the change in the wettability in view of formation of a picture element part 4. Therefore, in the second embodiment, it is preferable that the wettability on a transparent substrate 2 is less than 10 degrees as the contact angle with a liquid having the surface tension of 40 mN/m, more preferably not more than 5 degrees, particularly preferably not more than 1 degree.
Since materials and the like used in this embodiment other than a transparent substrate 2, that is, a wettability-variable layer 3, a picture element part 4, a protecting layer and the like are similar to those of the aforementioned first embodiment, they are not explained here.
Then, a process for producing a color filter of the present invention will be explained using following embodiments.
1. The Third Embodiment
The third embodiment of the present invention is a process for producing a color filter which is the aforementioned first embodiment in the present invention, and said process comprises;
(1) a step of forming a photocatalyst-containing layer having the wettability of a part irradiated with the energy which changed in a direction of reduction of a contact angle with a liquid, on a transparent substrate;
(2) a step of pattern-irradiating with the energy a picture element part forming portion on the photocatalyst-containing layer on which a picture element part is to be formed, to form an exposed part for a picture element part; and
(3) a step of coloring the exposed part for a picture element part with an inkjet system to form a picture element part.
FIG. 4 is for explaining each step of the third embodiment of the present invention. In this example, as showing in FIG. 4 (A), first, a photocatalyst-containing layer 6 is formed on a transparent substrate 2. This photocatalyst-containing layer 6 is formed by dispersing the aforementioned photocatalyst and binder in a solvent, if necessary, together with other additives to prepare a coating solution, applying this coating solution, and proceeding the hydrolyzing and polymerization condensing reaction to fix firm a photocatalyst in a binder. As a solvent to be used, alcoholic organic solvents such as ethanol, isopropyl alcohol and the like are preferable, and applying can be performed by the known applying method such as spin coating, spray coating, dip coating, roll coating, bead coating or the like.
Next, an exposed part for a picture element part 8 is formed on a picture element part forming portion on a photocatalyst-containing layer 6 through pattern-irradiated with the energy using a photomask 7. The exposed part for a picture element part 8 is a portion on which the contact angle with a liquid is lowered by the action of a photocatalyst which is included in a photocatalyst-containing layer 6, and converted into an inkphilic region (FIG. 4(B)).
Using an ink jet apparatus 9, an ink 10 is injected into an exposed part for a picture element part 8, which was converted into an inkphilic region by the energy irradiation, to color the part with red, green, and blue (FIG. 4(C)). In this case, since the interior of an exposed part for a picture element part 8 was made into an inkphilic region having the small contact angle with a liquid by the energy irradiation as described above, an ink 10 injected from an ink jet apparatus 9 is spread uniformly in an exposed part for a picture element part 8.
A picture element part 6 is formed by solidifying the ink thus adhered to an exposed part for a picture element part 12 (FIG. 4(D)). In the present invention, the solidification of an ink is carried out by various methods depending upon a kind of an ink used. For example, in the case of a water-soluble ink, the solidification is performed by removing water by heating or the like.
As described above, since an ink in an exposed part for a picture element part 8 is uniformly spread, when such ink is solidified to form a picture element part 4, a color filter having neither color missing nor color nonuniformity can be formed.
(Another Example of Method for Forming Picture Element Part)
In the embodiment described above, a picture element part 4 can be formed through irradiating with energy at a time and adhering ink to an exposed part. However, in the third embodiment, when adhering ink, there is a narrow space, between exposed parts for an picture element part which is an inkphilic region irradiated with energy. Therefore, there are some possibilities to occur some problems such as mixing two sorts of ink for adjacent picture element parts during formation of the picture element part. As a method for avoiding such a problem, a method shown in FIG. 5 may be proposed, in which a step of irradiating with energy and forming a picture element part are divided into at least two times.
In this method, first, a photocatalyst-containing layer 6 is formed on a transparent substrate 2, similar to that of the third embodiment described above (FIG. 5(A)). Next, the energy is irradiated using a photomask similar to the above-described method. However, in the method described above, the photomask is designed such that exposed parts for a picture element part correspond to the entire picture element part, can be formed. On the other hand, in this method, a photomask 7′ is designed such that a picture element part can be formed alternately, then, a exposed part for the first picture element part 11 is formed on the photocatalyst-containing layer 6 using the photomask 7′ (FIG. 5(B)). After that, the ink 10 is injected to the exposed part for the first picture element part 11 converted into an inkphilic region by the energy irradiation to color, then cured to form the first picture element part 12 (FIG. 5(C)). The energy irradiation and coloring to a picture element part using inkjet apparatus are conducted similar to that of the first method except a shape of a photomask 7′.
The first picture element part 12 formed by above-described method preferably has ink-repellent property itself in order to prevent the first picture element part from coloring by second ink injection through the inkjet apparatus. Further, the surface of the first picture element part can be treated with ink-repellent treatment agent such as silicone compounds or fluorine including compounds.
The transparent substrate 2 on which the first picture element part 12 is formed, is shown in FIG. 6(A). For example, when picture element parts consist of three color parts of red (R), green (G) and blue (B), from left side, the first red picture element part (R1) is formed, then the first blue picture element part (B1) is formed through skipping the first blue picture element part (G1). Next, the second green picture element part (G2) is formed through skipping the second red picture element part (R2). According to the above described method, for a start, the first picture element part 12 is formed alternately. An example of the photomask 7 using this step, is shown in FIG. 7 as (A-1) or (B-1).
Next, the energy is again irradiated on the entire surface of the photocatalyst-containing layer 6 on which the first picture element part 12 is formed. In this case, the energy may be pattern-irradiated using a photomask again as well as the energy may be irradiated the entire surface like this. The photomask for second pattern-irradiating with the energy is designed such that an exposed part for the second picture element part 13 is formed between the first picture element parts 12, and it is possible to use the photomask, for example, shown in FIG. 7 as (A-2) or (b-2).
The portion except for an exposed part for the first picture element part 11 is also irradiated with the energy through the energy irradiation to an entire surface, to be converted to an inkphilic region (FIG. 5(D)).
Then, the ink 10 is injected to the inkphilic region through using a inkjet apparatus 9 for coloring the region, and cured the ink to form the second picture element part 14. The second picture element part 14 is illustrated in the figure such that there is a space between the second picture element parts 14 and the first picture element part, however, in practice, the second picture element part 14 is formed so as to fill up a space between the first picture element parts 12. Exposing and coloring to a picture element part using an inkjet apparatus are conducted similar to that of the example described above.
FIG. 6(B) is shown the condition that the second picture element part is formed like this. Through forming the second picture element part 14 so as to fill up a space between the first picture element parts 12, picture element parts having three color parts which sequences in order of red(R), green(G), and blue(B) from left side.
Finally, a protecting layer is formed on the picture element part to form a color filter. Following is the reason why the formation of the picture element part is divided into two times.
In case of forming a picture element part in the condition of not forming a shading part on a transparent substrate, a shading part can not use as a partition. Therefore, when a picture element part is formed such that an exposed part for a picture element part converted to an inkphilic region through the energy irradiation, is colored by an inkjet system, and when a space between the exposed parts for a picture element part is narrow, that is, the width of an ink-repellent region where not irradiating with the energy is narrow, there are some possibilities of mixing some sorts of ink for adjacent picture element parts through migration over an ink-repellent region during formation of a picture element part. Accordingly, it is desirable to form adjacent picture element parts as apart as possible when forming the picture element part. In the method for forming a picture element part described above, when the first picture element part 12 is formed, the energy is pattern-irradiated such that the picture element part is formed alternately. Accordingly, the adjacent picture element part that is formed in the first time can be positioned apart. In this method, an exposed part for the first picture element part 11 can be formed in the condition that a relatively wide ink-repellent region exists between them. Therefore, there is no possibility of mixing some sorts of ink 10 for adjacent picture element parts when coloring through using an inkjet apparatus 9. Then, through irradiating again with the energy between the first picture element parts 12 by the entire irradiation or pattern-irradiation, a space between them are converted to an inkphilic region. And through coloring the space with an inkjet apparatus 9, a color filter which do not have disadvantage such as ink mixing and color nonuniformity, can be obtained.
According to this method, it is possible to reduce or eliminate a space between picture element parts. Therefore, a colored layer (aggregate of picture element parts) having the excellent flatness can be formed. When it is necessary to form a picture element part continuously, this method should be used.
In the method for a picture element part, a photomask using when the second energy irradiation is pattern-irradiation, may be a photomask shown in FIG. 7 as (B-2), in which the entire region on which the first picture element is formed, is exposed to convert the entire ink-repellent region between the first picture element parts 12 to inkphilic region, or may be a photomask shown in FIG. 7 as (A-2), in which the predetermined portion between the first picture element parts is exposed to form the second picture element part.
At the second energy irradiation, through irradiation to the entire surface or irradiation using the photomask showing FIG. 7 as (B-2), there is no space between picture element parts, and a picture element part is formed continuously as shown in FIG. 6(B) concerning thus obtained picture element part. On the other hand, when using a photomask as shown in FIG. 7 as (A-2), a color filter that has a space between the picture element parts, shown in FIG. 5(E), can be obtained, since an ink-repellent region can be remained between the picture element parts. In the present invention, either method can be employed, and a color filter to be obtained may be either type of a color filter.
(Concerning Forming Method for Ink-repellent Convex Part)
In the present invention, before forming a picture element part, an ink-repellent convex part may be formed. For example, when the ink-repellent convex part is formed surrounding a picture element part region where the all picture element parts are to be formed, it can be prevented from a problem such that a picture element part can not be formed precisely because ink is flowed out at a portion surrounding a picture element part region.
Such an ink-repellent convex part may be formed following steps; forming an exposed part for an ink-repellent convex part before forming an exposed part for a picture element part, and forming an ink-repellent convex part through applying a resin composition to the exposed part for an ink-repellent convex part. The photomask for forming the ink-repellent convex part described above may be employed one, for example, shown in FIG. 7 as (C-1) or (D-1). First, an exposed part for an ink-repellent convex part is formed through using such a photomask and exposing on a photocatalyst-containing layer. In case of using the photomask shown in FIG. 7 as (C-1), the exposed part for an ink-repellent convex part is formed at the upper end side and at the lower end side of the picture element part region. In case of using the photomask shown as (D-1), the exposed part for an ink-repellent convex part is formed surrounding the picture element part region. Then, a resin composition is adhered to the exposed part for an ink-repellent convex part and cured to form an ink-repellent convex part.
After forming such an ink-repellent convex part, through using the method for forming a picture element part described above (for example, the first picture element part is formed through using the photomask shown in FIG. 7 as (C-2) or (D-2), and then the second picture element part is formed through using the photomask shown as (A-2) or (B-2), or irradiating the entire surface), a picture element part is formed, and a color filter is formed.
In the present invention, a region where the ink-repellent convex part may be formed between picture element parts as well as formed at upper and lower end part of a picture element part region or surrounding a picture element part region.
A step of forming this ink-repellent convex part will be explained using FIG. 8. According to the same manner as in the aforementioned third embodiment shown in FIG. 4, a photocatalyst-containing layer 6 is formed so as to cover a transparent substrate 2 (FIG. 8(A)), and thus obtained member is irradiated with the energy via a photomask for an ink-repellent convex part 15. By pattern-irradiating the energy via a photomask for an ink-repellent convex part, an exposed part for an ink-repellent convex part 16 is formed on a photocatalyst-containing layer 6 on a boundary portion of a picture element part (FIG. 8(B)).
Ink for an ink-repellent convex part 17 such as a UV-curing resin monomer is adhered to this exposed part for an ink-repellent convex part 16 by an Ink jet apparatus 9 (FIG. 8(C)). A method of applying the ink for an ink-repellent convex part is not limited to a method by an ink jet apparatus but other methods, for example, dip coating and the like may be used.
And, by curing an ink for an ink-repellent convex part 17 by UV irradiation or the like an ink-repellent convex part 5 is formed on the surface of a photocatalyst-containing layer 6 (FIG. 8(C)).
By irradiating the whole surface or pattern-irradiating with the energy from a side of a photocatalyst-containing layer 6, to the thus formed member in which an ink-repellent convex part 5 is formed on a photocatalyst-containing layer 6, a part other than a part on which an ink-repellent convex part 5 is formed, or only a picture element part forming portion, is exposed and made into an exposed part for a picture element part (FIG. 8(D)) and, thereafter, according to the aforementioned manner, an ink 10 is injected and adhered to this part using an ink jet apparatus 9 and cured to form a picture element part 4 and, thus, a color filter 1 with an ink-repellent convex part 5 provided thereon can be manufactured (FIG. 8(E)).
In this method, since an exposed part for an ink-repellent convex part is provided by pattern-irradiating a photocatalyst-containing layer between picture element parts with the energy, an ink-repellent convex part having an arbitrary width can be formed. Therefore, by applying an ink for an ink-repellent convex part thereon, an ink-repellent convex part having an arbitrary width can be formed. Hence, by adjusting the width of a photomask for an ink-repellent convex part 15, adjusting the width between picture element parts can be conducted.
In this method, the pattern of an inkphilic region can be formed based on the difference in the reaction rate between regions to which the reaction rate increasing energy has been added and a region to which the reaction rate increasing energy has not been added, by adding the aforementioned photocatalystic reaction initiating energy and activating a photocatalyst to initiate the change in the wettability by the catalytic reaction in a photocatalyst-containing layer, and adding the reaction rate increasing energy to a part having the changed wettability to promote the catalytic reaction of the part.
2. The Forth Embodiment
The forth embodiment of the present invention is one of processes for producing a color filter of the aforementioned second embodiment of the present invention, and comprises:
(1) a step of forming a photocatalyst-containing layer having the wettability of the energy-irradiated part on a transparent substrate, which changes in a direction of reduction of the contact angle with liquid, on a boundary portion of a picture element part forming portion which is a part on which a picture element part is to be formed; and
(2) a step of forming the picture element part on the picture element part forming portion on the transparent substrate.
This process is explained using FIG. 9. A photocatalyst-containing layer 6 is first formed on a boundary portion of a picture element part forming portion, on which a picture element part is to be formed, on a transparent substrate 2. As a method of forming a photocatalyst-containing layer in a pattern like state, for example, mention may be made of a method forming the layer by a photolithography using a photosensitive sol-gel solution, a method by printing and the like.
Ink 10 is adhered using an ink jet apparatus 9 on a part (picture element part forming portion) on which a photocatalyst-containing layer 6 is not formed, on a transparent substrate 2 on which the thus formed photocatalyst-containing layer 6 is formed (FIG. 9(B)). Upon this, the wettability of the surface of a transparent substrate 2 has been made into more inkphilic as compared with the wettability of a surface on a photocatalyst-containing layer 6. Therefore, upon formation of a picture element part 4, ink 10 is not adhered to a photocatalyst-containing layer showing the ink-repellent properties and is adhered to only a picture element part forming portion on a transparent substrate 2, to form a picture element part. Then, adhered ink is cured to form a picture element part 4 between a photocatalyst-containing layer 6 (FIG. 9(C)).
After forming a picture element part 4, the energy is irradiated from a side on which a picture element part 4 is formed (FIG. 9(D)). In this case, a protecting layer (not shown in a drawing) which is formed as needed, can be formed easily because a photocatalyst-containing layer 6 is converted into an inkphilic region.
In this embodiment, because ink 10 is adhered directly on the transparent substrate 2, it is preferable that the wettability on a transparent substrate 2 is inkphilic. More particularly, it is preferable that the wettability is less than 10 degrees as the contact angle with a liquid having the surface tension of 40 mN/m, more preferably not more than 5 degrees as the contact angle with a liquid having the surface tension of 40 mN/m, particularly preferably not more than 1 degree. This is because, by making a surface of a transparent substrate 2 into an inkphilic region, an ink 10 is uniformly spread over a transparent substrate and disadvantages such as color nonuniformity and the like do not occur.
A color liquid crystal panel can be formed by combining the thus obtained color filter, and an opposite substrate which is opposite to this color filter and having a black matrix, and encapsulating a liquid crystal compound therebetween. The thus obtained color liquid crystal panel has the advantages originated from the color filter of the present invention, that is, advantages that color nonuniformity and color missing do not occur, and it is advantageous in a respect of cost.
30 g of isopropylalcohol, 0.4 g of MF-160E (manufactured by Tohchem Products Co.), a main component of which is fluoroalkylsilane, 3 g of trimethoxymethylsilane (manufactured by Toshiba Silicone Co., Ltd., TSL8113) and 20 g of a dispersion of titanium oxide which is photocatalyst in water ST-KO1 (manufactured by Ishthara Sangyo Kaisha, Ltd.) were mixed and stirred at 100° C. for 20 minutes. This was diluted three-times with isopropylalcohol to obtain a composition for a photocatalyst-containing layer.
The pattern-exposure was performed for 50 seconds on this photocatalyst-containing layer at an illuminance of 70 mW/cm2 with a mercury lamp (wavelength 365 nm) via a photomask, an exposed part was formed and the contact angles with a liquid of an unexposed part and an exposed part were measured. At unexposed part, the contact angle with a liquid having the surface tension of 30 mN/m (manufactured by Junsei Chemical Co., Ltd., ethylene glycol monoethyl ether) was measured (after 30 seconds from dropping of a droplet from a microsyringe) of using a contact angle measuring apparatus (manufactured by Kyowa Interface Science Co., Ltd., type CA-Z) and found to be 30 degrees. As an exposed part, the contact angle with a liquid having the surface tension of 50 mN/m (manufactured by Junsei Chemical Co., Ltd., wettability index standard solution No. 50) was measured in a similar method and found to be 7 degrees. Like this, an exposed part was converted into an inkphilic region and it was confirmed that the pattern formation is possible due to the difference in the wettability between an exposed part and an unexposed part.
3. Formation of First Picture Element Part
Then, a photocatalyst-containing layer was formed on a transparent substrate according to the same manner as that described above (correspond to FIG. 5(A)). This photocatalyst-containing layer was exposed (at an illuminance of 70 mW/cm2 for 50 seconds) with a mercury lamp (wavelength 365 nm) via a photomask which has an opening pattern shown in FIG. 7 as (B-1), convert an exposed part for the first picture element part into an inkphilic region (not greater than 7 degrees in terms of the contact angle with a liquid having the surface tension of 50 mN/m) (correspond to FIG. 5(B)).
Then, a UV-curing type multifunctional acrylate monomer ink of each RGB color containing 5% by weight of a pigment, 20% by weight of a solvent, 5% by weight of an initiator and 70% by weight of a UV-curing resin was used for the first picture element part to color it with a corresponding color using an ink jet apparatus, and UV-treated to cure it, and the first picture element part is formed (correspond to FIG. 5(C) and FIG. 6(A)). Here, as regards each of red, green and blue ink, as a solvent, polyethylene glycol monometylethyl acetate was used and, as an initiator, Ilgacular 369 (trade name, manufactured by Chiba Speciality Chemicals Co., Ltd.) was used and, as a UV-curing resin, DPHA (dipentaerythritol hexaacrylate, manufactured by Nippon Kayaku Co., Ltd.) was used. In addition, regarding a pigment, as a red ink, C. I. Pigment Red 177 was used and, as a green ink, C. I. Pigment Green 36 was used and, as a blue ink, C. I. Pigment Blue 15+C. I. Pigment Violet 23 was used.
4. Formation of Second Picture Element Part
Next, the photocatalyst-containing layer was exposed (at an illuminance of 70 mW/cm2 for 50 seconds) with a mercury lamp (wavelength 365 nm) via a photomask which has an opening pattern shown in FIG. 7 as (B-2), convert an exposed part for the second picture element part into an inkphilic region (not greater than 7 degrees in terms of the contact angle with a liquid having the surface tension of 50 mN/m) (correspond to FIG. 5(D)). And then, the second picture element part was formed between the first picture element parts similar to the method for forming the first picture element part (FIG. 5(E) and FIG. 6(B)).
A protecting layer was formed by applying a two-pack mixing type thermally curing agent (SS7265 manufactured by Nippon Synthetic Rubber Co., Ltd.) with a spin coater and curing-treated at 200° C. for 30 minutes to obtain a color filter. Although the resulting color filter was not provided a black matrix, it was of the high quality free from color missing or color nonuniformity at a picture element part.
According to the similar manner to that in Example 1, the similar photocatalyst-containing layer was formed on a transparent substrate. Then, an ink-repellent convex part on the photocatalyst-containing layer was formed as follow.
First, 10 g of a UV-curing type resin (ester acrylate resin, manufactured by Arakawa Chemical Co., Ltd., trade name; AQ-11), 0.5 g of an initiator (manufactured by Chiba Speciality Chemicals Co., Ltd. trade name; Ilgacular 184), and 1.25 g of distilled water were agitated for 3 minutes, then a composition for an ink-repellent convex part was obtained.
Next, thus formed photocatalyst-containing layer was exposed via a photomask which has an opening pattern shown in FIG. 7 as (C-1) similar manner to that in Example 1, and wettability was changed to obtain an exposed part for an ink-repellent convex part. Then, the composition for an ink-repellent convex part was applied on the exposed part for an ink-repellent convex part with a dip coater at the rate of 5 cm/sec., after that, exposed by UV to form the ink-repellent convex part having thickness of 1.7 μm.
On the photocatalyst-containing layer on which the ink-repellent convex part was formed, the first picture element part was formed by the similar manner to that in Example 1 except for using a photomask on which an opening pattern shown in FIG. 7 as (C-2) was provided.
Then, the second picture element part was formed by the similar manner to that in Example 1 except for using a photomask which has an opening pattern shown in FIG. 7 as (A-2), for exposing a space between the first picture element parts, and a protecting layer was formed by the similar manner to that in Example 1.
Because of having the ink-repellent convex part, thus obtained color filter did not have a problem such that a picture element part can not form precisely since ink flowed out at a portion surrounding a color filter, and it was of the high quality free from color missing or color nonuniformity at a picture element part similar to that of Example 1.
3 g of isopropylalcohol, 0.014 g of fluoroalkylsilane (manufactured by Tohchem Products Co.; MF-160E (trade name), a 50% by weight solution of isopropyl ether of N-[3-(trimethoxysilyl)propyl]-N-ethylperfluorooctabesulfonamide), 2 g of a titanium oxide sol (manufactured by Ishihara Sangyo Kaisha, Ltd.: STS-01 (trade name)), 0.6 g of a silica sol (manufactured by Nippon synthetic Rubber, Ltd.; Glaska HPC7002 (trade name)) and 0.2 g of alkylalkoxysilane (manufactured by Nippon synthetic Rubber, Ltd.; HPC402II (trade name)) were mixed and stirred at 100° C. for 20 minutes. This solution was applied on a non-alkali glass substrate having the thickness of 0.7 mm by a spin coating method to obtain a photocatalyst-containing layer having the thickness of 0.15 μm.
An unexposed part and an exposed part were elementally-analyzed with a X-ray photoelectron spectroscopy apparatus (V.G. Scientific Co., Ltd., ESCLAB220-I-XL). The quantitive calculation was performed with the Sherry correction and Scofield relative sensitivity correction to obtain the results which were expressed as a relative value of weight relative to 100 of titanium (Ti) and found to be fluorine (F) 1279 relative to titanium (Ti) 100 at an unexposed part and flourine (F) 6 relative to titanium (Ti) 100 at an exposed part.
From these results, it was found that, by exposing a photocatalyst-containing layer, a ratio of fluorine in the surface of the photocatalyst-containing layer is reduced and, thereby, the surface is converted from ink-repellent into inkphilic.
1. A color filter, in which a shading part provided on a border part of a picture element part is not formed, comprising a transparent substrate, a photocatalyst-containing layer formed on the transparent substrate comprising at least a photocatalyst and a binder, and having a wettability which is changed so that a contact angle with a liquid is reduced by an energy irradiation, and the picture element part being provided on the photocatalyst-containing layer by a pattern of a plurality of colors with an ink jet system; and wherein an ink-repellent convex part is formed on the photocatalyst-containing layer at the border part of the picture element part.
2. The color filter according to claim 1, wherein the photocatalyst is one or more substances selected from the group consisting of titanium oxide (TiO2), zinc oxide (ZnO), tin oxide (SnO2), strontium titanate (SrTiO3), tungsten oxide (WO3), bismuth oxide (Bi2O3) and iron oxide (Fe2O3).
3. The color filter according to claim 2, wherein the photocatalyst is titanium oxide (TiO2).
4. The color filter according to claim 3, wherein the photocatalyst-containing layer contains a fluorine element in a surface of the photocatalyst-containing layer at rate of 5 times more relative to the Ti element as determined by a X-ray photoelectron spectroscopy.
5. The color filter according to claim 1, wherein the binder is organopolysiloxane having a fluoroalkyl group.
6. The color filter according to claim 1, wherein the binder is organopolysiloxane which is a hydrolyzed and condensed compound or co-hydrolyzed and condensed compound of one or more of silicon compound; represented by YnSiX(4−n) wherein Y represents alkyl group, fluoroalkyl group, vinyl group, amino group, phenyl group or epoxy group, X represents alkoxyl group or halogen, and n is an integer of 0 to 3.
7. The color filter according to claim 6, wherein a silicon compound having a fluoroalkyl group among the silicon compounds constituting the organopolysiloxane is contained at an amount of 0.01 mol % or more.
8. The color filter according to claim 1, wherein a contact angle with a liquid having the surface tension of 40 mN/m on the photocatalyst-containing layer is not less than 10 degrees at a part not irradiated with the energy and less than 10 degrees at a part irradiated with the energy.
9. The color filter according to claim 1, wherein the picture element part colored with an ink jet system is a picture element part colored with an ink jet system using a UV-curing ink.
10. The color filter according to claim 1,
wherein the photocatalyst-containing layer contains fluorine and the photocatalyst-containing layer is formed so that the fluorine content in a surface of the photocatalyst-containing layer is reduced by an action of the photocatalyst upon irradiating the photocatalyst-containing layer with the energy as compared with before the energy irradiation.
11. The color filter according to claim 10, wherein the fluorine content in part in which the fluorine content is reduced by irradiating the photocatalyst-containing layer which the energy is 10 or less relative to 100 of the fluorine content of a part not irradiated with the energy.
12. A liquid crystal panel comprising a color filter according to claim 1 and a substrate which are opposite to the color filter, and provided a shading part, wherein a liquid crystal compound is encapsulated between both substrates.
13. A color filter, in which a shading part provided or a border part of a picture element part is not formed, comprising a transparent substrate, a picture element part provided on the transparent substrate by a pattern of a plurality of colors with an ink jet system, and a photocatalyst-containing layer formed on the border part of the picture element part comprising at least a photocatalyst and a binder, and having a wettability which is changed so that a contact angle with a liquid is reduced by an energy irradiation.
14. The color filter according to claim 13, wherein the wettability on the transparent substrate is less than 10 degrees in terms of the contact angle with a liquid having the surface tension of 40 mN/m.
15. A process for producing a color filter, in which a shading part provided on a border part of a picture element part is not formed, which comprises:
(1) a step of providing a photocatalyst-containing layer having the wettability of the energy-irradiated part which changes in a direction of reduction of the contact angle with a liquid, on a transparent substrate;
(2) a step of forming an exposed part for an ink-repellent convex part by pattern-irradiating with energy an an ink-repellent convex part forming portion on which the ink-repellent convex part, on the photocatalyst-containing layer formed on the transparent substrate, is to be formed;
(3) a step of forming the ink-repellent convex part by applying an ink to the exposed part for an ink-repellent convex part;
(4) a step of forming an exposed part for a picture element part by irradiating with energy on a picture element part forming portion on which the picture element part, on the photocatalyst-containing layer formed on the transparent substrate, is to be formed; and
(5) a step of coloring the exposed part for the picture element part with an ink jet system, to form the picture element part.
16. The process for producing a color filter according to claim 15, wherein the ink-repellent convex part is formed between the picture element parts.
17. The process for producing a color filter according to claim 15, wherein the contact angle on the photocatalyst-containing layer with a liquid having a surface tension of 40 mN/m is 10 degrees or more at a part not irradiated with the energy and less than 10 degrees at a part irradiated with the energy.
18. The process for producing a color filter according to claim 15, wherein the step of coloring the exposed part for the picture element part with the ink jet system uses a UV-curing ink.
19. A process for producing a color filter, in which a shading part provided on a border part of a picture element part is not formed, which comprises:
(1) a step of providing a photocatalyst-containing layer having a wettability of an energy-irradiated part which changes in a direction of reduction of a contact angle with a liquid, at the border part of a picture element part forming portion on which the picture element part is to be formed, on a transparent substrate; and
20. The process for producing a color filter according to claim 19, wherein the wettability on the transparent substrate is less than 10 degrees as the contact angle with a liquid having the surface tension of 40 mN/m.
21. The process for producing a color filter according to claim 19, wherein the step of coloring the exposed part for the picture element part with the ink jet system uses a UV-curing ink.
US09607010 1999-01-07 2000-06-29 Color filter and process for producing the same Expired - Fee Related US6815125B1 (en)
JP18670499 1999-06-30
JPP11-186704 1999-06-30
JPP11-281520 1999-10-01
JP28152099A JP3395841B2 (en) 1999-01-07 1999-10-01 The color filter and its manufacturing method
US10956649 US20050042385A1 (en) 1999-01-07 2004-10-01 Color filter and process for producing the same
US10956649 Continuation US20050042385A1 (en) 1999-01-07 2004-10-01 Color filter and process for producing the same
US6815125B1 true US6815125B1 (en) 2004-11-09
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US09607010 Expired - Fee Related US6815125B1 (en) 1999-01-07 2000-06-29 Color filter and process for producing the same
US10956649 Abandoned US20050042385A1 (en) 1999-01-07 2004-10-01 Color filter and process for producing the same
US (2) US6815125B1 (en)
EP (1) EP1065533B1 (en)
KR (1) KR100687835B1 (en)
DE (2) DE60034512T2 (en)
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DE60034512D1 (en) 2007-06-06 grant
DE60034512T2 (en) 2008-01-03 grant
EP1065533B1 (en) 2007-04-25 grant
KR20010082506A (en) 2001-08-30 application
EP1065533A2 (en) 2001-01-03 application
EP1065533A3 (en) 2003-02-05 application
KR100687835B1 (en) 2007-02-27 grant
US20050042385A1 (en) 2005-02-24 application
JP2006209102A (en) 2006-08-10 Black resin composition for display element and member for display element
US20080318018A1 (en) 2008-12-25 Black Resin Composition for Display Device, and Member for Display Device
JP2003128966A (en) 2003-05-08 Ink jet ink for color filter, method for producing the ink and color filter
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OKABE, MASATO;KOBAYASHI, HIRONORI;YAMAMOTO, MANABU;REEL/FRAME:010938/0361