JP2009271275A - Color filter and liquid crystal display apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display apparatus, having superior color reproducibility, while keeping high luminance by using at least one LED as a backlight and using a color filter that matches with the backlight, and to provide the color filter which is to be used in the liquid crystal display apparatus. <P>SOLUTION: C. I. Pigment Blue 15:6 is used at the least as an organic pigment to be used for forming a blue colored layer. A blue color composition containing C. I. Pigment Violet 23 at the least is used as a violet pigment. The ratio of the content of a blue pigment component to that of a violet pigment component is changed; and when the color filter is made to match with a white LED, the hue and the pigment concentration of the solid content of the blue color composition are adjusted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a color filter and a liquid crystal display device, and in particular, at least one kind of LED is used for a backlight provided in the liquid crystal display device, and color reproducibility is excellent by matching the color filter with this backlight. The present invention relates to providing a color filter realizing high luminance (bright liquid crystal display) and a liquid crystal display device using the color filter.

  In recent years, the demand for color liquid crystal display devices has been increasing mainly for mobile applications such as home TVs and mobile phones, but in order to further enhance the competitive advantage over other competing plasma displays and organic EL displays. However, it is necessary to develop a liquid crystal display device having high performance and high reliability.

  As development requirements for liquid crystal display devices in recent years, expansion of the color reproduction range, low power consumption, thinning, and the like are required. Among them, the expansion of the color reproduction range is highly dependent on the backlight and the color filter provided in the liquid crystal display device, but cold cathode fluorescent tubes (CCFL: Cold Cathode Fluorescent) which have been widely used as a backlight from the past. Lanp) has a problem in that the color purity is lowered due to emission of sub-peaks peculiar to phosphors used in cold cathode fluorescent tubes. As shown in the emission spectrum of the cold cathode fluorescent tube in FIG. 1, this sub-peak is light emission existing at around 490 nm at the boundary between blue and green and at around 580 nm at the boundary between red and green.

  In order to solve this problem, it is necessary to reduce the sub-peak of the phosphor used in the cold cathode fluorescent tube or to reduce the half width of the spectral characteristics of the color filter to be combined. However, there is a problem that cannot be realized unless the brightness is greatly reduced. For this reason, in order to expand the color reproduction range, a method using a white LED without a sub-peak as a backlight has been studied.

  However, even when a white LED is used as the backlight, a decrease in luminance accompanying the expansion of the color reproduction range is inevitable. For this reason, it is necessary to study the expansion of color reproducibility and the improvement of luminance by suppressing the decrease in luminance accompanying the expansion of the color reproduction range.

As a method of improving the luminance of the liquid crystal display device, generally, the luminance of the backlight itself is increased or the number of backlight light sources is increased. However, these methods have a problem that the power consumption of the liquid crystal display device increases.
In particular, in recent years, there has been a situation where power consumption has increased with the increase in size of liquid crystal display devices.

  As a method for solving this problem, there is a method for improving the stimulus value Y (lightness) in the tristimulus values XYZ of the color filter. Lightness is a value that defines brightness, and the higher the lightness, the more efficiently the light from the backlight can be transmitted, so that power consumption can be reduced. However, as described above, it is difficult to improve the brightness in recent years when the expansion of the color reproduction range is required.

  Therefore, in the present invention, in order to improve the brightness of the color filter, optimization is performed by combining various white LEDs and the spectral characteristics of the color filter. At this time, attention was paid to the blue colored layer having the lowest brightness among the red, green, and blue colored layers provided in the color filter.

The contents of the study include changing the content ratio of the blue pigment component and the purple pigment component of the blue colored layer to match the white LED used in the present invention and the pigment occupying in the solid content of the blue colored composition. Concentration optimization was performed.
JP 2006-47975 A

  The present invention is for solving the above-described problems. When at least one kind of LED (light emitting diode) is used for a backlight provided in a liquid crystal display device, the present invention has high luminance and excellent color reproducibility. Another object of the present invention is to provide a color filter that enables a liquid crystal display device. It is another object of the present invention to provide a liquid crystal display device using the color filter.

  The present invention provides a white LED that obtains white light emission using each of an independent red LED, green LED, and blue LED, or a white LED that is a combination of a red LED, a green LED, and a blue LED, a blue LED, a red LED, and a green LED. White LEDs that are mixed and mixed with phosphors, white LEDs that are mixed with blue LEDs and red and phosphors, or white LEDs that obtain white light by mixing blue and YAG phosphors A color filter used in a liquid crystal display device using any white LED as a backlight, and C.I. as a blue pigment for forming a blue pixel constituting the color filter. I. Pigment Blue 15: 6 and C.I. I. A color filter using a photosensitive blue coloring composition containing at least Pigment Violet 23.

  Further, according to the present invention, in the color filter according to the above invention, a white LED that obtains white light emission using each of the independent red LED, green LED, and blue LED or a combination of red LED, green LED, and blue LED is mixed. A color filter for use in a liquid crystal display device using a white LED as a backlight, the color filter being contained in the solid content of the blue coloring composition. I. PigmentBlue 15: 6 and C.I. I. When the total amount of PigmentViolet 23 is 100% by weight, C.I. I. PigmentViolet 23 is contained in a range of 1 to 25% by weight.

  The present invention also provides a color filter for use in a liquid crystal display device using a white LED mixed with the blue LED, the red LED, and the green phosphor as a backlight in the color filter according to the invention, wherein the blue coloration C. contained in the solid content of the composition. I. PigmentBlue 15: 6 and C.I. I. When the total amount of PigmentViolet 23 is 100% by weight, C.I. I. PigmentViolet 23 is contained in the range of 10 to 30% by weight.

  Further, the present invention is a color filter used in a liquid crystal display device using a white LED mixed with the blue LED, the red light emitting phosphor and the green light emitting phosphor as a backlight in the color filter according to the above invention, C. contained in the solid content of the blue coloring composition. I. PigmentBlue 15: 6 and C.I. I. When the total amount of PigmentViolet 23 is 100% by weight, C.I. I. PigmentViolet 23 is contained in the range of 5 to 30% by weight.

The present invention also provides a color filter used in a liquid crystal display device using a white LED that obtains white light by mixing the blue LED and a YAG phosphor as a backlight in the color filter according to the invention, wherein the blue coloring composition is used. C. contained in the solid content of the product. I. PigmentBlue 15: 6 and C.I. I. When the total amount of PigmentViolet 23 is 100% by weight, C.I. I. PigmentViolet 23 is contained in the range of 5 to 10% by weight.

  In addition, the present invention is a liquid crystal display device using the color filter according to claim 1, wherein the backlight is a white LED or a red LED that obtains white light emission using each of an independent red LED, a green LED, and a blue LED. White LED mixed color by combining LED, green LED and blue LED, White LED mixed color by combining blue LED, red LED and green phosphor, Mixed color combining blue LED, red light emitting phosphor and green light emitting phosphor The liquid crystal display device is a white LED which is either a white LED or a white LED which obtains white light by mixing a blue LED and a YAG phosphor.

  The present invention also provides a liquid crystal display device using the color filter according to claim 2.

  The present invention also provides a liquid crystal display device using the color filter according to claim 3.

  The present invention also provides a liquid crystal display device using the color filter according to claim 4.

  The present invention also provides a liquid crystal display device using the color filter according to claim 5.

  As an effect of the present invention, when a white LED is used as a backlight of a liquid crystal display device, a higher brightness and higher color rendering display than when a cold cathode fluorescent tube is used, that is, a liquid crystal display with a bright screen and colorful display A color filter for realizing the device can be provided. In addition, it is possible to provide a liquid crystal display device with a bright screen and a colorful display using the color filter.

Below, the color filter by this invention is demonstrated in detail based on the embodiment. The color filter of the present invention includes a plurality of color pixels on at least a transparent substrate.
A plurality of colors include combinations of red, green, blue (R, G, B), yellow, magenta, cyan (Y, M, C), but the color filter of the present invention has all the colors having blue pixels. Applicable to filters.

  Next, the white LED used as the backlight of the present invention will be described. The present invention provides a white LED backlight that obtains white light emission using an independent red LED, green LED, and blue LED each having an emission spectrum as shown in FIG. 2, or a red LED and a green LED. White LED (hereinafter referred to as RGB-LED) mixed with a blue LED and a white LED (hereinafter referred to as RGB-LED) having a light emission spectrum as shown in FIG. RB-LED + G), a white LED (hereinafter referred to as B-LED + RG) mixed with a blue LED having an emission spectrum as shown in FIG. 4, a red light-emitting phosphor and a green light-emitting phosphor, as shown in FIG. White LED that obtains white light by mixing a blue LED with a light emission spectrum and a YAG phosphor ( Lower, it is possible to use) of B-YAG.

The color filter used in the present invention will be described. The color filter of the present invention is a color filter having pixels of a plurality of colors on a transparent substrate. A photosensitive coloring composition mainly composed of an organic pigment, a transparent resin, a photocrosslinking agent, and a solvent is used for forming one color pixel, and at least PB15: 6 is used as an organic pigment for forming a blue pixel. A blue coloring composition containing at least PV23 is used as a pigment.

When CCFL is used for the backlight and PB15: 6 is used for the pigment of the blue coloring composition, the chromaticity coordinates of blue on the chromaticity diagram are x = 0.143 and y = 0.060. When a white LED was used for the backlight and the same pigment was used for the pigment of the blue coloring composition, the pigment concentration required when y = 0.060 was adjusted was first examined. As a result, in addition to B-YAG, the concentration of the pigment in the solid content of the blue coloring composition was increased as compared with the case where CCFL was used. At this time, it was found that the maximum was 2.5 times or more in RB-LED + G. In addition, at least, the RGB-LED increased 1.16 times.

これは、白色ＬＥＤの発光スペクトルの緑色発光成分がＣＣＦＬと比べ短波長側に存在し発光強度も強いため、白色ＬＥＤの発光スペクトルと青色画素の透過光スペクトルの重なりが大きいためである。このため、色純度の高い青色を得るには、白色ＬＥＤの発光スペクトルの緑色発光成分と青色画素の透過光スペクトルの重なりを小さくする必要がある。そこで、青色画素の透過光スペクトルの半値幅を狭めることが必要となるため、青色着色組成物の固形分中に占める顔料濃度が増加する結果となった。

This is because the green LED component of the emission spectrum of the white LED is present on the short wavelength side as compared with the CCFL and the emission intensity is strong, so that the overlap between the emission spectrum of the white LED and the transmitted light spectrum of the blue pixel is large. For this reason, in order to obtain blue with high color purity, it is necessary to reduce the overlap between the green light emission component of the emission spectrum of the white LED and the transmitted light spectrum of the blue pixel. Therefore, since it is necessary to narrow the half width of the transmitted light spectrum of the blue pixel, the pigment concentration in the solid content of the blue coloring composition is increased.

  However, if the pigment concentration in the solid content of the blue coloring composition is increased, the lightness is lowered, so that the pigment concentration needs to be reduced.

  As a countermeasure to reduce the pigment concentration in the solid content of the blue coloring composition, there is a method of reducing the overlap with the green emission spectrum component of the white light emitting LED by bringing the transmitted light spectrum of the blue pixel to the short wavelength side. . For example, a violet pigment having a transmission region on the shorter wavelength side than the blue pigment component is added, and the content of the blue pigment is further reduced to bring the transmitted light spectrum of the blue pixel to the shorter wavelength side.

  Therefore, in order to demonstrate the above countermeasures, examination was performed using RGB-LED, RB-LED + G, B-LED + RG, and B-YAG, which are white LEDs as a backlight. At this time, when the total content of PB15: 6, which is a blue pigment contained in the blue coloring composition, and PV23, which is a purple pigment, is 100% by weight, PV23 is 0, 5, 10, 15 in the blue coloring composition. , 20, 25, and 30% by weight, the pigment concentration in the solid content of the blue coloring composition required when the film thickness is 2 μm and the value of the y-axis of the CIE chromaticity coordinate is 0.06 Asked. As a result, it was confirmed that as the PV23 ratio increased, the blue pigment concentration in the solid content decreased as shown in Table 2.

最も固形分中に占める青色顔料濃度が高かったＲＢ−ＬＥＤ＋Ｇでも、ＰＶ２３の含有量を１０重量％以上にすることにより、ＣＣＦＬを用いた場合のＰＢ１５：６を単体で用いた際と同等以下の値にできることがわかった。他に、ＣＣＦＬと同等以下の値にするためには、ＲＧＢ−ＬＥＤの場合で５重量％、Ｂ−ＬＥＤ＋ＲＧの場合で１０重量％のＰＶ２３を含有させれば良いことが分かった。

Even in the case of RB-LED + G, which has the highest blue pigment concentration in the solid content, by setting the content of PV23 to 10% by weight or more, it is equal to or less than that when using PB15: 6 when CCFL is used alone. I found out that it can be a value. In addition, it has been found that in order to obtain a value equal to or less than that of CCFL, it is sufficient to contain 5 wt% PV23 in the case of RGB-LED and 10 wt% in the case of B-LED + RG.

Further, Table 3 shows the results of checking the brightness when the content of PV23 in each backlight at this time was changed. In CCFL, the maximum brightness was less than 6.92 when the content of PV23 was changed. However, in RGB-LED, RB-LED + G, and B-YAG, the brightness was 6.92 or more, which was a higher value (high light transmittance, that is, brighter) than when CCFL was used. Furthermore, even with B-LED + RG, brightness higher than CCFL was obtained by setting the content of PV23 to 5% or more.

以上の検討から、バックライトに白色ＬＥＤを用いた際に、青色着色組成物の固形分中に含まれる顔料濃度を低減することが可能となった。これにより、ＣＣＦＬを用いた場合よりも高い明度を得ることが可能となった。

From the above examination, when white LED was used for the backlight, it became possible to reduce the pigment concentration contained in the solid content of the blue coloring composition. This makes it possible to obtain a higher brightness than when CCFL is used.

However, if the content of PV23 is increased, the purple color becomes darker. Therefore, increasing the amount of PV23 unnecessarily impairs the intended blue hue. Therefore, when the film thickness is 2 μm and the y-axis value of the CIE chromaticity coordinate is 0.06, the value is the x-axis value of the CIE chromaticity coordinate having a lightness of 6.92 or more and a blue hue. Then, the range of x value from 0.140 to less than 0.150 was set. If it is 0.140 or less, the color is green, and if it is 0.150 or more, a purple hue is obtained.
The ratio of PB15: 6 and PV23 in the blue coloring composition was examined so as to be within this range. Table 4 shows the x-coordinate values that change when the PV23 content is changed. The chromaticity and lightness were measured using a microspectrophotometer (OSP-SP200) manufactured by Olympus.

  As a result, when RGB-LED is used, PV23 is 0 to 25% by weight with respect to all pigments, PV23 is 10 to 30% by weight when RB-LED + G is used, and PV23 is used when B-LED + RG is used. Was found to satisfy the above condition when PV23 was contained in the range of 0 to 10% by weight when 5 to 30% by weight and B-YAG was used.

なお、付言すれば、青色着色組成物の固形分中に含まれている青色顔料にいう「固形分」とは、青色着色組成物に含まれる溶剤や樹脂ワニス中に含まれる蒸発成分を除いた成分という意味である。よく知られるように、フォトリソグラフィ法にてカラーフィルタを作成する際に用いる感光性の着色組成物には蒸発成分としての溶剤が含まれ、これがために着色組成物はガラス基板への塗布適性があるのであるが、カラーフィルタ作製工程では、塗膜を硬化定着するために加熱する工程があり、このとき溶剤等の蒸発成分は塗膜から除去される。加熱工程のあとに層を構成しているものが固形分である。
〔カラーフィルタの作製条件と方法〕
以下に、本発明のカラーフィルタを得るための方法を記述する。本発明のカラーフィルタは少なくとも透明基板上に複数色の画素を備えている。複数色には赤、緑、青（Ｒ、Ｇ、Ｂ）の組み合わせやイエロー、マゼンダ、シアン（Ｙ、Ｍ、Ｃ）の組み合わせが挙げられるが、本発明のカラーフィルタは青色画素を有する全てのカラーフィルタに対して適用が可能である。

In addition, “additional solid” as used in the blue pigment contained in the solid content of the blue coloring composition excludes the solvent contained in the blue coloring composition and the evaporation component contained in the resin varnish. It means ingredient. As is well known, the photosensitive coloring composition used when creating a color filter by a photolithography method contains a solvent as an evaporation component, which makes the coloring composition suitable for application to a glass substrate. However, in the color filter manufacturing process, there is a process of heating in order to cure and fix the coating film. At this time, evaporation components such as a solvent are removed from the coating film. What constitutes the layer after the heating step is the solid content.
[Color filter fabrication conditions and methods]
Hereinafter, a method for obtaining the color filter of the present invention will be described. The color filter of the present invention includes a plurality of color pixels on at least a transparent substrate. A plurality of colors include a combination of red, green, blue (R, G, B) and a combination of yellow, magenta, cyan (Y, M, C), but the color filter of the present invention has all blue pixels. It can be applied to color filters.

  The white LED and the color filter of the present invention are used by being incorporated in a liquid crystal display device, and the display method of the liquid crystal display device is TN (Twisted Nematic) method, STN (Super Twisted Nematic) method, IPS (In-Plane Switching). The present invention can be applied to a liquid crystal display method such as a VA (Vertical Alignment) method.

  The transparent substrate used in the method of the present invention is generally used in a liquid crystal display device, and includes a plastic substrate such as PET and a glass substrate, but it is usually preferable to use a glass substrate. In the case of using a light shielding pattern, it is only necessary to use a known method in which a metal thin film such as chromium or a light shielding resin pattern is previously provided on the transparent substrate.

The method for producing each color pixel on the transparent substrate may be produced by any known method such as an inkjet method, a printing method, a photoresist method, or an etching method. However, considering high definition, controllability and reproducibility of spectral characteristics, etc., a transparent colored substrate is obtained by dispersing a photosensitive coloring composition in a suitable solvent together with a photoinitiator and a polymerizable monomer in a transparent resin. A photoresist method is preferred in which a color filter is formed by repeating the process of forming a pixel of one color by forming a coating film on the coating film, pattern exposure to the coating film, development, and baking, for each color.

  Each color pixel provided in the color filter of the present invention is prepared according to the following method, for example, when a photosensitive coloring composition is prepared and formed by photolithography. A pigment serving as a colorant is dispersed in a suitable solvent together with a photoinitiator and a polymerizable monomer in a transparent resin. There are various methods such as mill base, three rolls, jet mill and the like, and there are no particular limitations.

  Specific examples of organic pigments that can be used in the photosensitive coloring composition forming each color pixel of the color filter of the present invention are shown by color index numbers.

  Examples of red coloring compositions for forming red pixels include C.I. I. PigmentRed 7, 9, 14, 41, 48: 1, 48: 2, 48: 3, 48: 4, 81: 1, 81: 2, 81: 3, 97, 122, 123, 146, 149, 168, 177, 178, 179, 180, 184, 185, 187, 192, 200, 202, 208, 210, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 246, 254, 255, 264, Red pigments such as 272 and 279 can be used. A yellow pigment and an orange pigment can be used in combination with the red coloring composition.

  Examples of yellow pigments include C.I. I. Pigment Yellow 1, 2, 3, 4, 5, 6, 10, 12, 13, 14, 15, 16, 17, 18, 20, 24, 31, 32, 34, 35, 35: 1, 36, 36: 1, 37, 37: 1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 86, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 120, 123, 125, 126, 127, 128, 129, 137, 138, 139, 144, 146, 147, 148, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 171, 172, 17 , And the like 174,175,176,177,179,180,181,182,185,187,188,193,194,199,213,214.

  Examples of orange pigments include C.I. I. Pigment Orange 36, 43, 51, 55, 59, 61, 71, 73 and the like.

  Examples of the green coloring composition for forming a green pixel include C.I. I. Green pigments such as Pigment Green 7, 10, 36, 37, and 58 can be used. The green coloring composition can be used in combination with the same yellow pigment as the red coloring composition.

The blue coloring composition for forming a blue pixel is mainly used for C.I. I. PigmentBlue 15: 6 and C.I. I. In addition to PigmentViolet 23, for example, C.I. I. Blue pigments such as Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 16, 22, 60, 64, and 80 can be used.
In addition, C.I. I. Pigment Violet 1, 19, 27, 29, 30, 32, 37, 40, 42, 50 and the like can be used in combination.

Also, in combination with the above organic pigment, good coatability while balancing the saturation and lightness,
In order to ensure sensitivity, developability, etc., inorganic pigments can be used in combination. Examples of inorganic pigments include yellow lead, zinc yellow, red pepper, cadmium red, ultramarine, bitumen, chromium oxide green, cobalt green, and other metal oxide powders, metal sulfide powders, and metal powders. Furthermore, for color matching, a dye can be contained within a range that does not lower the heat resistance.

  The transparent resin used for the coloring composition includes a thermoplastic resin, a thermosetting resin, and a photosensitive resin. If necessary, the transparent resin can be used alone or in admixture of two or more monomers or oligomers that are precursors thereof that are cured by irradiation with radiation to produce a transparent resin.

  Examples of the thermoplastic resin include butyral resin, styrene-maleic acid copolymer, chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyurethane resin, and polyester resin. , Acrylic resins, alkyd resins, polystyrene, polyamide resins, rubber resins, cyclized rubber resins, celluloses, polyethylene, polybutadiene, polyimide resins, and the like. Examples of the thermosetting resin include epoxy resins, benzoguanamine resins, rosin-modified maleic acid resins, rosin-modified fumaric acid resins, melamine resins, urea resins, and phenol resins.

  Examples of the photosensitive resin include (meth) acrylic compounds having a reactive substituent such as an isocyanate group, an aldehyde group, and an epoxy group on a linear polymer having a reactive substituent such as a hydroxyl group, a carboxyl group, or an amino group, A resin obtained by reacting an acid and introducing a photocrosslinkable group such as a (meth) acryloyl group or a styryl group into the linear polymer is used. In addition, linear polymers containing acid anhydrides such as styrene-maleic anhydride copolymer and α-olefin-maleic anhydride copolymer can be obtained from (meth) acrylic compounds having hydroxyl groups such as hydroxyalkyl (meth) acrylate. Half-esterified products are also used.

  Polymerizable monomers and oligomers that can be used as photocrosslinking agents include methyl (meth) acrylate, ethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and cyclohexyl (meth). Acrylate, β-carboxyethyl (meth) acrylate, diethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, triethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, trimethylol Propane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, 1,6-hexanediol diglycidyl ether di (meth) acrylate, bisphenol A diglycidyl ether Rudi (meth) acrylate, neopentyl glycol diglycidyl ether di (meth) acrylate, dipentaerythritol hexa (meth) acrylate, tricyclodecanyl (meth) acrylate, ester acrylate, (meth) acrylic acid ester of methylolated melamine, Various acrylic esters and methacrylic esters such as epoxy (meth) acrylate and urethane acrylate, (meth) acrylic acid, styrene, vinyl acetate, hydroxyethyl vinyl ether, ethylene glycol divinyl ether, pentaerythritol trivinyl ether, (meth) acrylamide, N -Hydroxymethyl (meth) acrylamide, N-vinylformamide, acrylonitrile and the like. These can be used alone or in combination of two or more, and for the purpose of keeping the photocurability appropriate, other polymerizable monomers and oligomers can be mixed and used as necessary.

When the composition is cured by ultraviolet irradiation, a photopolymerization initiator or the like is added to the coloring composition. As photopolymerization initiators, 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, diethoxyacetophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 1- Acetophenone compounds such as hydroxycyclohexyl phenyl ketone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzyl Benzoin compounds such as dimethyl ketal, benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone, acrylated benzophenone, 4-benzoyl-4'-methyldiphenyl sulfide, 3 Benzophenone compounds such as 3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, 2,4- Thioxanthone compounds such as diethylthioxanthone, 2,4,6-trichloro-s-triazine, 2-phenyl-4,6-bis (trichloromethyl) -s-triazine, 2- (p-methoxyphenyl) -4,6 -Bis (trichloromethyl) -s-triazine, 2- (p-tolyl) -4,6-bis (trichloromethyl) -s-triazine, 2-piperonyl-4,6-bis (trichloromethyl) -s-triazine 2,4-bis (trichloromethyl) -6-styryl-s-triazine, 2- (naphth-1-yl) -4,6-bis (trichloro) Methyl) -s-triazine, 2- (4-methoxy-naphth-1-yl) -4,6-bis (trichloromethyl) -s-triazine, 2,4-trichloromethyl- (piperonyl) -6-triazine, Triazine compounds such as 2,4-trichloromethyl (4′-methoxystyryl) -6-triazine, 1,2-octanedione, 1- [4- (phenylthio)-, 2- (O-benzoyloxime)], Oxime ester compounds such as O- (acetyl) -N- (1-phenyl-2-oxo-2- (4′-methoxy-naphthyl) ethylidene) hydroxylamine, bis (2,4,6-trimethylbenzoyl) phenyl Phosphine compounds such as phosphine oxide, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 9,10-phenanthrenequinone, camphorquinone, ethyl anthraquino Quinone compounds such as borate compounds, carbazole compounds, imidazole compounds, titanocene compounds and the like.

  Further, as sensitizers, triethanolamine, methyldiethanolamine, triisopropanolamine, methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, isoamyl 4-dimethylaminobenzoate, 2-dimethylaminoethyl benzoate, 2-Ethylhexyl 4-dimethylaminobenzoate, N, N-dimethylparatoluidine, 4,4′-bis (dimethylamino) benzophenone, 4,4′-bis (diethylamino) benzophenone, 4,4′-bis (ethylmethyl) Amine-based compounds such as amino) benzophenone can also be used in combination.

  Furthermore, the coloring composition can contain a chain transfer agent. Examples of chain transfer agents include hexanedithiol, decanedithiol, 1,4-butanediol bisthiopropionate, 1,4-butanediol bisthioglycolate, ethylene glycol bisthioglycolate, and ethylene glycol bisthiopropionate. , Trimethylolpropane tristhioglycolate, trimethylolpropane tristhiopropionate, trimethylolpropane tris (3-mercaptobutyrate), pentaerythritol tetrakisthioglycolate, pentaerythritol tetrakisthiopropionate, trimercaptopropionate tris (2-hydroxyethyl) isocyanurate, 1,4-dimethylmercaptobenzene, 2,4,6-trimercapto-s-triazine, 2- (N, N-dibutylamino) -4,6-di Mercapto -s- triazine, and the like. These chain transfer agents can be used alone or in combination.

It is also possible to add a thermal crosslinking agent. Examples of the thermal crosslinking agent include epoxy resins and melamine resins. The epoxy resin is a compound having at least one epoxy group in the molecule. For example, an alicyclic epoxy resin, a polyalcohol type epoxy resin, a polyglycol type epoxy resin, a bisphenol A or F type epoxy resin, tetrahydroxyphenyl Ethane type epoxy resin, polyolefin type epoxy resin, phenol novolac epoxy resin, methylenecyclohexane oxide, cycloheptene epoxide, 1,2-epoxycyclohexane, glycerol / polyglycidyl ether, trimethylolpropane / polyglycidyl ether, resorcin / diglycidyl Ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, ethylene glycol (polyethylene glycol) There is a glycidyl ether, and the like. Any of these may be used alone or in admixture of two or more. Moreover, a melamine resin can also be mixed and used as needed. Examples of the melamine resin include alkylated melamine resins (methylated melamine resin, butylated melamine resin, etc.), mixed etherified melamine resins, and the like, which may be a high condensation type or a low condensation type. Also about these, it can use individually or in mixture of 2 or more types. Moreover, an epoxy resin can also be mixed and used as needed.

  The coloring composition can contain an organic solvent as necessary. Examples of the organic solvent include cyclohexanone, ethyl cellosolve acetate, butyl cellosolve acetate, 1-methoxy-2-propyl acetate, diethylene glycol dimethyl ether, ethylbenzene, ethylene glycol diethyl ether, xylene, ethyl cellosolve, methyl-n amyl ketone, propylene glycol monomethyl ether toluene, Examples include methyl ethyl ketone, ethyl acetate, methanol, ethanol, isopropyl alcohol, butanol, isobutyl ketone, petroleum solvent, and the like. These may be used alone or in combination.

  Next, as a method for producing a color filter, the above-described photosensitive coloring composition is applied on a transparent substrate and prebaked. Spin coating, dip coating, die coating, etc. are usually used as the means for coating, but it is not limited to these as long as it is a method capable of coating with a uniform film thickness on a 40 to 60 cm square substrate. Prebaking is preferably performed at 50 to 120 ° C. for about 10 to 20 minutes. The coating film thickness is arbitrary, but considering the spectral transmittance and the like, the film thickness after pre-baking is usually about 2 μm. Exposure is performed through a pattern mask on a substrate on which a photosensitive coloring composition has been applied to form a coating film. A normal high-pressure mercury lamp or the like may be used as the light source.

  Subsequently, development is performed. An alkaline aqueous solution is used as the developer. Examples of the alkaline aqueous solution include a sodium carbonate aqueous solution, a sodium hydrogen carbonate aqueous solution, a mixed aqueous solution of the two, or a mixture obtained by adding an appropriate surfactant to them. After development, it is washed with water and fired to obtain a pixel of any one color.

  By repeating the above-described series of steps by changing the photosensitive coloring composition and pattern as many times as necessary, it is possible to obtain a colored pattern in which a necessary number of colors are combined, that is, a plurality of color pixels.

  Hereinafter, the present invention will be described in detail, but the present invention is not limited to this without departing from the spirit of the present invention. In addition, as for the compounding ratio of each component in an Example, all are weight ratios.

[Preparation of photosensitive coloring composition]
A colored composition was prepared in the following manner.
<Blue coloring composition>
A mixture having the following composition was uniformly stirred and mixed, then dispersed in a sand mill for 5 hours using glass beads having a diameter of 1 mm, and then filtered through a 5 μm filter to prepare a blue pigment dispersion.
Blue pigment: C.I. I. PigmentBlue 15: 6
("Rionol Blue ES" manufactured by Toyo Ink Co., Ltd.) 3.6 parts Dispersant ("Sols Birds 20000" manufactured by Zeneca) 0.6 parts Acrylic varnish (solid content 20%) 22.1 parts A mixture having the following composition was stirred and mixed so as to be uniform, and then filtered through a 5 μm filter to obtain a blue colored composition.
-26.3 parts of the above dispersion-9.4 parts of acrylic transparent resin-4.7 parts of monomer (M-402)-1.4 parts of photoinitiator (Irg.379)-Sensitizer (DETX-S) 0.2 parts ・ Dispersant (BYK-323) 1.0 part ・ PGMAc 11.0 parts ・ EEP 20.0 parts ・ Cyclohexanone 26.0 parts
100.0 parts in total.

<Purple Colored Composition>
A mixture having the following composition was uniformly stirred and mixed, then dispersed in a sand mill for 5 hours using glass beads having a diameter of 1 mm, and then filtered through a 5 μm filter to prepare a purple pigment dispersion.
Purple pigment: C.I. I. PigmentViolet23
("Pariogen Violet 5890" manufactured by BASF) 5.6 parts Dispersant ("Sols Birds 20000" manufactured by Zeneca) 1.0 parts Acrylic varnish (solid content 20%) 34.4 parts Thereafter, a mixture having the following composition Was stirred and mixed so as to be uniform, and then filtered through a 5 μm filter to obtain a blue colored composition.
・ Dispersion 41.0 parts ・ Acrylic transparent resin 4.1 parts ・ Monomer (M-402) 4.7 parts ・ Photoinitiator (Irg.379) 1.4 parts ・ Sensitizer (DETX-S) 0.2 parts Dispersant (BYK-323) 1.0 part PGMac 24.4 parts EEP 20.0 parts cyclohexanone 3.2 parts
100.0 parts in total.

[Production of color filter]
100% by weight to 0% by weight, 95% by weight to 5% by weight, 90% by weight to 10% by weight, 85% by weight to 15% by weight, 80% by weight to 20% A transparent resin, a photocrosslinking agent, a solvent, and the like are added to a solution mixed at a ratio of 75% by weight, 75% by weight to 25% by weight, 70% by weight to 30% by weight, and the film thickness is 2 μm and the CIE chromaticity coordinates are A color filter was prepared by adjusting the pigment concentration in the solid content required when the y-axis value was 0.06. This operation corresponds to the addition of the content of PV23 found on the vertical axis of Tables 2 to 4 described above from 0 wt% to 30 wt% in increments of 5 wt%.

A blue colored composition prepared in various proportions was applied to a glass substrate on which a resin black matrix was formed as a light-shielding pattern by spin coating so that the film thickness after firing was 2 μm. After drying, striped pattern exposure was performed with an exposure machine, development was performed with an alkaline developer, and baking was performed to form striped blue pixels on a transparent substrate. The alkaline developer has the following composition.
・ 1.5% by weight sodium carbonate
・ Sodium bicarbonate 0.5% by weight
-8.0% by weight of anionic surfactant
("Peralex NBL" manufactured by Kao Corporation)
・ 90% by weight of water
As described above, a liquid crystal display device having excellent color reproducibility while maintaining high luminance by using at least one kind of LED in a backlight provided in the liquid crystal display device and using a color filter matched to the backlight, and the same It has become possible to provide a color filter to be used.

CCFL emission spectrum RGB-LED emission spectrum RB-LED + G emission spectrum B-LED + RG emission spectrum Emission spectrum of B-YAG Spectral distribution curve of PB15: 6 Spectral distribution curve of PV23

Claims (10)

  White LED that obtains white light emission using each of independent red LED, green LED, and blue LED or white LED that is a combination of red LED, green LED, and blue LED, and blue LED, red LED, and green phosphor White LED, white LED mixed with color, white LED mixed with a combination of blue LED, red light emitting phosphor and green light emitting phosphor, or white LED that obtains white light by mixing color of blue LED and YAG phosphor A color filter for use in a liquid crystal display device using an LED as a backlight, and C.I. I. Pigment Blue 15: 6 and C.I. I. A color filter using a photosensitive blue coloring composition containing at least PigmentViolet23.   Color used in a liquid crystal display device using a white LED that obtains white light emission using each of the independent red LED, green LED, and blue LED, or a white LED that is a mixture of red LED, green LED, and blue LED as a backlight. A filter, which is contained in the solid content of the blue coloring composition; I. PigmentBlue 15: 6 and C.I. I. When the total amount of PigmentViolet 23 is 100% by weight, C.I. I. The color filter according to claim 1, wherein Pigment Violet 23 is contained in an amount of 1 to 25% by weight.   A color filter used in a liquid crystal display device using a white LED obtained by combining and mixing the blue LED, the red LED, and the green phosphor as a backlight, and is a C.I. I. PigmentBlue 15: 6 and C.I. I. When the total amount of PigmentViolet 23 is 100% by weight, C.I. I. The color filter according to claim 1, wherein Pigment Violet 23 is contained in an amount of 10 to 30% by weight.   A color filter for use in a liquid crystal display device using a white LED mixed with a combination of the blue LED, a red light-emitting phosphor and a green light-emitting phosphor as a backlight, and C contained in the solid content of the blue coloring composition . I. PigmentBlue 15: 6 and C.I. I. When the total amount of PigmentViolet 23 is 100% by weight, C.I. I. The color filter according to claim 1, wherein Pigment Violet 23 is contained in an amount of 5 to 30% by weight.   A color filter used in a liquid crystal display device using a white LED that obtains white light by mixing color of the blue LED and a YAG phosphor as a backlight, and is contained in the solid content of the blue coloring composition. I. PigmentBlue 15: 6 and C.I. I. When the total amount of PigmentViolet 23 is 100% by weight, C.I. I. The color filter according to claim 1, wherein Pigment Violet 23 is contained in a range of 5 to 10% by weight.   A liquid crystal display device using the color filter according to claim 1, wherein the backlight is a white LED or a red LED and a green LED and a blue light that obtains white light emission using each of an independent red LED, a green LED, and a blue LED. White LED mixed color by combining LED, White LED mixed color by combining blue LED, red LED and green phosphor, White LED mixed color by combining blue LED, red light emitting phosphor and green light emitting phosphor, or A liquid crystal display device, wherein the white LED is a white LED that obtains white light by mixing a blue LED and a YAG phosphor.   A liquid crystal display device using the color filter according to claim 2.   A liquid crystal display device using the color filter according to claim 3.   A liquid crystal display device using the color filter according to claim 4.   A liquid crystal display device using the color filter according to claim 5.

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