JP2008304677A - Color correction filter, image display device, and liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color correction filter which can remove light of neutral tints and can improve color tone expression of an image display device while suppressing fall of luminance of the image display device. <P>SOLUTION: The color correction filter of this invention has a color correction layer containing J aggregates of a dyestuff. The dyestuff is at least one dyestuff chosen from a group composed of cyanine, merocyanine, squarylium and porphyrin. Half value width of a maximum absorption peak of the color correction layer lies in a range of 5 nm and 30 nm. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a color correction filter, an image display device, and a liquid crystal display device.

  In recent years, a liquid crystal display device that controls light emitted from a light source device such as a cold cathode tube or a light emitting diode (LED) by a liquid crystal panel to form an image has been developed and put into practical use. In the liquid crystal display device, in order to uniformly distribute light from the light source device over the entire display surface, a light guide plate is arranged in parallel so as to overlap the liquid crystal panel and on an optical path following the light source device. . The light source device is disposed beside the light guide plate or on the opposite side of the light guide plate from the liquid crystal panel.

  The cross-sectional view of FIG. 6 shows the configuration of a conventional liquid crystal display device. As illustrated, the liquid crystal display device includes a liquid crystal panel 61, a cold cathode tube 64, and a light guide plate 65 as main components. The liquid crystal panel 61 has a configuration in which a first polarizing plate 631 and a second polarizing plate 632 are disposed on both sides of a liquid crystal cell 62, respectively. The liquid crystal cell 62 includes a liquid crystal layer 640 at the center thereof. A first alignment film 651 and a second alignment film 652 are disposed on both sides of the liquid crystal layer 640, respectively. A first transparent electrode 661 and a second transparent electrode 662 are disposed outside the first alignment film 651 and the second alignment film 652, respectively. On the outer side of the first transparent electrode 661, a color filter 670 such as R (red), G (green), and B (blue) in a predetermined arrangement and a black matrix 690 are disposed via a protective film 680. Yes. A first substrate 601 and a second substrate 602 are disposed outside the color filter 670, the black matrix 690, and the second transparent electrode 662, respectively. In the liquid crystal panel 61, the first polarizing plate 631 side is a display surface side, and the second polarizing plate 632 side is a back surface side. The light guide plate 65 is arranged in parallel on the back side of the liquid crystal panel 61 so as to overlap the liquid crystal panel 61. The cold cathode tube 64 is disposed on the opposite side of the light guide plate 65 from the liquid crystal panel 61.

  In this liquid crystal display device, the light emitted from the cold cathode fluorescent lamp 64 is adjusted by the light guide plate 65 so that the luminance distribution in the plane is uniform, and is emitted to the second polarizing plate 632 side. Further, after the emitted light is controlled for each pixel by the liquid crystal layer 640, only light in a predetermined wavelength band (for example, wavelength bands of R, G, and B) is transmitted by the color filter 670 to perform color display. Is realized.

  Originally, in order to display a color image in a liquid crystal display device, at least three colors of light are required. Many color tones are expressed by the degree of mixing of these three colors of light. Currently, R, G, and B primary light are commonly used in liquid crystal display devices. The wavelength bands corresponding to the three primary light are R in the range of about 610 to 750 nm, G is in the range of about 500 to 560 nm, and B is in the range of about 435 to 480 nm. The liquid crystal display device cuts light other than the necessary wavelength band by using a color filter corresponding to each of the three primary colors of light emitted from a light source device (for example, a cold cathode tube) having an emission spectrum in a wide wavelength range. Thus, the light of the three primary colors is designed to be obtained. The amount of light emitted from each color filter is determined by controlling the amount of light incident on the color filter by each component of the liquid crystal panel disposed on the light source device side from the color filter. The Finally, the color tone and light emission intensity of each pixel of the liquid crystal display device are determined by adjusting the intensity of the light of the three primary colors in the pixel. Accordingly, the higher the color purity of the light of the three primary colors in the pixel, the wider the range of color tones formed by mixing the light of the three primary colors, which is more preferable.

  However, in the conventional liquid crystal display device, an intermediate color other than R, G, and B (yellow light in a wavelength band between the R wavelength band and the G wavelength band, the G wavelength band) in the emission spectrum of the cold cathode tube. Light in a wavelength band between the B and B wavelength bands, and the like, and this is not sufficiently cut by the color filter, resulting in a problem that the color tone of the display image quality is lowered. Further, when LEDs corresponding to the three primary colors of R, G, and B are used as the light source device, although the color tone expression is excellent, there is a problem that the control circuit is complicated and the cost is increased.

  In addition, a liquid crystal display device has been proposed in which white light is generated by the emission of a blue LED and the yellow emission of yttrium aluminum garnet (YAG), which is a fluorescent material, and this is used as a light source (pseudo white light source) (for example, , See Patent Document 1). However, in this liquid crystal display device, since the pseudo white light source contains more light of the intermediate color than the cold cathode tube, the color tone expression is inferior.

  On the other hand, it has a fluorescent material that absorbs yellow light with a wavelength of 575 to 605 nm (light with a wavelength band between the R wavelength band and the G wavelength band) and emits R light with a wavelength of 610 nm or more. An optical device for a liquid crystal display device that converts yellow light in an emission spectrum of a light source into R light using a material has been proposed (see Patent Document 2).

JP 2004-117594 A JP 2005-276586 A

  However, even in the optical device for the liquid crystal display device, the removal of the light of the intermediate color is not complete and the color tone expression is inferior. In particular, the mixing of the yellow light into the R wavelength band greatly affects the visual image quality degradation, and the improvement of the color purity of the R light is a major issue. Moreover, even if a general fluorescent material is a class with the sharpest absorption peak, the half width of the maximum absorption peak is as wide as 50 to 100 nm. For this reason, in the optical device for a liquid crystal display device having the fluorescent material, the R light is absorbed in addition to the yellow light. As a result, in the liquid crystal display device using the optical device, the luminance is lowered.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a color correction filter that can remove light of intermediate colors and improve color tone expression of an image display device while suppressing a decrease in luminance of the image display device.

In order to achieve the above object, the color correction filter of the present invention comprises:
A color correction layer containing a J aggregate of a dye;
The dye is at least one dye selected from the group consisting of cyanine, merocyanine, squarylium and porphyrin;
The full width at half maximum of the maximum absorption peak of the color correction layer is in the range of 5 to 30 nm.

  The image display device of the present invention is an image display device including a color correction filter, and the color correction filter is the color correction filter of the present invention.

  The liquid crystal display device of the present invention is a liquid crystal display device including a color correction filter, wherein the color correction filter is the color correction filter of the present invention.

  The color correction filter of the present invention has a color correction layer containing a J aggregate of a dye. The full width at half maximum of the maximum absorption peak of the color correction layer is as narrow as 5 to 30 nm. Therefore, according to the color correction filter of the present invention, it is possible to selectively absorb and remove intermediate color light. Therefore, by using the color correction filter of the present invention, it is possible to improve the color tone expression while suppressing a decrease in luminance of the image display device.

  In the present invention, the half-value width of the maximum absorption peak of the color correction layer is a difference in wavelength between two points that take half the maximum absorbance at the maximum absorption peak of the color correction layer. The half-value width can be obtained from the maximum absorption peak of the color correction layer obtained by measuring the absorption spectrum of the color correction layer with an ultraviolet-visible spectrophotometer, as described in Examples below. .

  In the present invention, “improvement of color tone expression” means, for example, by selectively absorbing and removing yellow light, which is an intermediate color between R and G, which affects the color tone expression of R, thereby expressing the color tone of R. And so on. As a result of the “improvement of color tone expression”, for example, the color purity of R light is improved.

  In the color correction filter of the present invention, it is preferable that the maximum absorption peak wavelength of the color correction layer is in a range of 560 to 610 nm.

  In the color correction filter of the present invention, it is preferable that the maximum absorbance of the color correction layer in the wavelength range of 560 to 610 nm is 0.8 or more.

  In the color correction filter of the present invention, the dye is preferably cyanine.

前記一般式（１）において、
Ｚ^１１およびＺ^１２は、それぞれ、−ＮＨ−、−ＣＨ_２−、−ＣＨ＝ＣＨ−またはヘテロ原子であり、置換基を有していても有していなくても良く、Ｚ^１１およびＺ^１２は同一でも異なっていても良い。前記へテロ原子は、特に制限されないが、例えば、Ｓ、Ｓｅ、Ｏ等が挙げられる。前記置換基としては、特に制限されないが、例えば、アルキル基、ハロゲン原子、オキソ基（＝Ｏ）等が挙げられる。Ｚ^１１およびＺ^１２において、例えば、−ＮＨ−、−ＣＨ_２−または−ＣＨ＝ＣＨ−の水素原子（Ｈ）のうち少なくとも一つが、アルキル基およびハロゲン原子の少なくとも一方で置換されていても良い。また、Ｚ^１１およびＺ^１２において、例えば、前記Ｓ原子が、オキソ基を置換基として有し、ＳＯまたはＳＯ_２であっても良い。前記アルキル基としては、例えば、炭素原子数１〜１２の直鎖または分枝アルキル基が好ましい。
環Ａｒ^１１およびＡｒ^１２は、それぞれ、含窒素環との縮合部分以外において不飽和結合を有していても有していなくても良く、芳香族性を有していても有していなくても良く、ヘテロ原子を有していても有していなくても良く、さらに置換基を有していても有していなくても良く、環Ａｒ^１１およびＡｒ^１２は同一でも異なっていても良い。前記置換基は、特に制限されないが、例えば、アルキル基およびハロゲン原子の少なくとも一方が好ましい。前記アルキル基としては、例えば、炭素原子数１〜１２の直鎖または分枝アルキル基が好ましい。環Ａｒ^１１およびＡｒ^１２は、特に制限されないが、例えば、５〜１０員環が好ましい。より具体的には、例えば、ベンゼン環、ピリジン環、ナフタレン環等が挙げられる。Ｒ^１１およびＲ^１２は、それぞれ、水素原子、または直鎖もしくは分枝アルキル基であり、前記アルキル基は、さらにイオン性置換基で置換されていても置換されていなくても良く、Ｒ^１１およびＲ^１２は同一でも異なっていても良い。前記アルキル基としては、例えば、炭素原子数１〜１８の直鎖または分枝アルキル基が好ましい。前記イオン性置換基は、特に制限されないが、アニオン性置換基が好ましく、前記アルキル基の末端が前記イオン性置換基で置換されていることが好ましい。前記アニオン性置換基は、特に制限されないが、例えば、スルホン酸基、カルボン酸基等が挙げられ、好ましくは、スルホン酸基である。より具体的には、例えば、前記アルキル基は、末端がスルホ基で置換されたスルホアルキル基、または末端がカルボキシ基で置換されたカルボキシアルキル基であっても良い。また、前記イオン性置換基のカウンターイオン（対イオン）は、特に制限されない。前記イオン性置換基がアニオン性置換基である場合、カウンターイオン（カチオン）は、例えば、水素イオン、金属イオン、アンモニウムイオン等が挙げられる。また、例えば、前記式（１）〜（４）中のＮ^＋自体が前記アニオン性置換基のカウンターイオンであっても良い。前記金属イオンとしては、特に制限されないが、例えば、アルカリ金属イオン、アルカリ土類金属イオン、遷移金属イオン等が挙げられる。前記アルカリ金属イオンとしては、例えば、Ｌｉ^＋、Ｎａ^＋、Ｋ^＋、Ｒｂ^＋、Ｃｓ^＋等が挙げられる。前記アルカリ土類金属イオンとしては、例えば、Ｂｅ^２＋、Ｍｇ^２＋、Ｃａ^２＋、Ｓｒ^２＋、Ｂａ^２＋等が挙げられる。前記アンモニウムイオンとしては、特に制限されないが、例えば、ＮＨ_４ ^＋、アルキルアンモニウムイオン等が挙げられる。前記アルキルアンモニウムイオンとしては、特に制限されないが、例えば、テトラメチルアンモニウムイオン、トリメチルアンモニウムイオン、テトラエチルアンモニウムイオン、トリエチルアンモニウムイオン等が挙げられる。

前記一般式（２）〜（４）において、
Ｒは、水素原子、または直鎖もしくは分枝アルキル基であり、各Ｒは同一でも異なっていても良い。前記アルキル基としては、例えば、炭素原子数１〜１２の直鎖または分枝アルキル基が好ましい。

前記一般式（１）〜（４）において、
Ｒ’は、水素原子、直鎖もしくは分枝アルキル基、または芳香族基であり、前記アルキル基は、好ましくは、炭素原子数１〜１８の直鎖もしくは分枝アルキル基であり、各Ｒ’は同一でも異なっていても良く、
ｎは、０または任意の正の整数であり、各ｎは同一でも異なっていても良い。ｎとしては、例えば、０、１または２が好ましい。

さらに、前記一般式（１）〜（４）において、式中におけるＮ^＋のカウンターイオン（アニオン）は、特に制限されず、１価のアニオンでも多価アニオンでも良く、１種類でも複数種類でも良い。１価のアニオンとしては、特に制限されないが、例えば、ハロゲン化物イオン、次亜ハロゲン酸イオン、亜ハロゲン酸イオン、ハロゲン酸イオン、過ハロゲン酸イオン、硝酸イオン、亜硝酸イオン、ヘキサフルオロリン酸イオン（ＰＦ_６ ⁻）、トリフルオロメタンスルホン酸イオン（ＣＦ_３ＣＯＯ⁻）等が挙げられ、Ｆ⁻、Ｃｌ⁻、Ｂｒ⁻、Ｉ⁻およびＣｌＯ_４ ⁻からなる群から選択される少なくとも一つが特に好ましい。多価アニオンとしては、特に制限されないが、例えば、硫酸イオン、亜硫酸イオン等が挙げられる。

なお、本発明において、「ハロゲン」とは、任意のハロゲン元素を指すが、例えば、フッ素、塩素、臭素およびヨウ素が挙げられる。また、本発明において、「アルキル基」とは、特に限定されない。前記アルキル基としては、例えば、メチル基、エチル基、ｎ−プロピル基、イソプロピル基、ｎ−ブチル基、イソブチル基、ｓｅｃ−ブチル基、ｔｅｒｔ−ブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ウンデシル基、ドデシル基、トリデシル基、テトラデシル基、ペンタデシル基、ヘキサデシル基、ヘプタデシル基、オクタデシル基、ノナデシル基、イコシル基等が挙げられる。アルキル基を構造中に含む基またはアルキル基から誘導される基（スルホアルキル基、カルボキシアルキル基、アルコキシ基等）についても同様である。また、置換基等が、鎖状構造を有する基（例えば、アルキル基、スルホアルキル基、カルボキシアルキル基、アルコキシ基等）である場合、特に制限しない限り、直鎖状でも分枝状でも良い。さらに、置換基等に異性体が存在する場合は、特に制限がない限り、どの異性体でも良い。例えば、単に「プロピル基」という場合はｎ−プロピル基およびイソプロピル基のどちらでも良い。単に「ブチル基」という場合は、ｎ−ブチル基、イソブチル基、ｓｅｃ−ブチル基およびｔｅｒｔ−ブチル基のいずれでも良い。単に「ナフチル基」という場合は、１−ナフチル基および２−ナフチル基のどちらでも良い。 In the color correction filter of the present invention, it is preferable that the cyanine is represented by at least one formula selected from the group consisting of the following general formulas (1) to (4).

In the general formula (1),
Z ¹¹ and Z ¹² are each —NH—, —CH ₂ —, —CH═CH—, or a heteroatom, which may or may not have a substituent. Z ¹¹ and Z ¹² May be the same or different. The hetero atom is not particularly limited, and examples thereof include S, Se, and O. Although it does not restrict | limit especially as said substituent, For example, an alkyl group, a halogen atom, an oxo group (= O) etc. are mentioned. In Z ¹¹ and Z ¹² , for example, at least one of the hydrogen atoms (H) of —NH—, —CH ₂ —, or —CH═CH— may be substituted with at least one of an alkyl group and a halogen atom. . In Z ¹¹ and Z ¹² , for example, the S atom may have an oxo group as a substituent, and may be SO or SO ₂ . As said alkyl group, a C1-C12 linear or branched alkyl group is preferable, for example.
Each of the rings Ar ¹¹ and Ar ¹² may or may not have an unsaturated bond other than the condensed portion with the nitrogen-containing ring, and may or may not have aromaticity. It may or may not have a hetero atom, and may or may not have a substituent, and the rings Ar ¹¹ and Ar ¹² may be the same or different. . The substituent is not particularly limited, but for example, at least one of an alkyl group and a halogen atom is preferable. As said alkyl group, a C1-C12 linear or branched alkyl group is preferable, for example. The rings Ar ¹¹ and Ar ¹² are not particularly limited, but for example, a 5- to 10-membered ring is preferable. More specifically, for example, a benzene ring, a pyridine ring, a naphthalene ring and the like can be mentioned. R ¹¹ and R ¹² are each hydrogen atom or a linear or branched alkyl group, said alkyl group may not be further substituted or substituted with an ionic substituent, R ¹¹ and R ¹² may be the same or different. As the alkyl group, for example, a linear or branched alkyl group having 1 to 18 carbon atoms is preferable. The ionic substituent is not particularly limited, but an anionic substituent is preferable, and a terminal of the alkyl group is preferably substituted with the ionic substituent. The anionic substituent is not particularly limited, and examples thereof include a sulfonic acid group and a carboxylic acid group, and a sulfonic acid group is preferable. More specifically, for example, the alkyl group may be a sulfoalkyl group having a terminal substituted with a sulfo group or a carboxyalkyl group having a terminal substituted with a carboxy group. Further, the counter ion (counter ion) of the ionic substituent is not particularly limited. When the ionic substituent is an anionic substituent, examples of the counter ion (cation) include a hydrogen ion, a metal ion, and an ammonium ion. For example, N ⁺ itself in the formulas (1) to (4) may be a counter ion of the anionic substituent. Although it does not restrict | limit especially as said metal ion, For example, an alkali metal ion, an alkaline-earth metal ion, a transition metal ion etc. are mentioned. Examples of the alkali metal ion include Li ⁺ , Na ⁺ , K ⁺ , Rb ⁺ , Cs ^{+ and the} like. Examples of the alkaline earth metal ions include Be ²⁺ , Mg ²⁺ , Ca ²⁺ , Sr ²⁺ , Ba ^{2+ and the} like. Examples of the ammonium ion is not particularly limited, for example, NH 4 ^_+, alkylammonium ion, and the like. The alkylammonium ion is not particularly limited, and examples thereof include tetramethylammonium ion, trimethylammonium ion, tetraethylammonium ion, and triethylammonium ion.

In the general formulas (2) to (4),
R is a hydrogen atom or a linear or branched alkyl group, and each R may be the same or different. As said alkyl group, a C1-C12 linear or branched alkyl group is preferable, for example.

In the general formulas (1) to (4),
R ′ is a hydrogen atom, a linear or branched alkyl group, or an aromatic group, and the alkyl group is preferably a linear or branched alkyl group having 1 to 18 carbon atoms, and each R ′ Can be the same or different,
n is 0 or any positive integer, and each n may be the same or different. As n, for example, 0, 1 or 2 is preferable.

Further, in the general formulas (1) to (4), the N ⁺ counter ion (anion) in the formula is not particularly limited, and may be a monovalent anion or a polyvalent anion, and may be one kind or plural kinds. . Although it does not restrict | limit especially as a monovalent anion, For example, halide ion, hypohalite ion, halite ion, halogenate ion, perhalogenate ion, nitrate ion, nitrite ion, hexafluorophosphate ion (PF ₆ ⁻ ), trifluoromethanesulfonate ion (CF ₃ COO ⁻ ) and the like can be mentioned, and at least one selected from the group consisting of F ⁻ , Cl ⁻ , Br ⁻ , I ⁻ and ClO ₄ ^— is particularly preferable. Although it does not restrict | limit especially as a polyvalent anion, For example, a sulfate ion, a sulfite ion, etc. are mentioned.

In the present invention, “halogen” refers to any halogen element, and examples thereof include fluorine, chlorine, bromine and iodine. In the present invention, the “alkyl group” is not particularly limited. Examples of the alkyl group include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, pentyl, hexyl, heptyl, and octyl. Group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group and the like. The same applies to a group containing an alkyl group in the structure or a group derived from an alkyl group (sulfoalkyl group, carboxyalkyl group, alkoxy group, etc.). Further, when the substituent or the like is a group having a chain structure (for example, an alkyl group, a sulfoalkyl group, a carboxyalkyl group, an alkoxy group, etc.), it may be linear or branched unless otherwise limited. Further, when an isomer exists in a substituent or the like, any isomer may be used unless there is a particular limitation. For example, when simply referring to “propyl group”, either an n-propyl group or an isopropyl group may be used. When simply referred to as “butyl group”, any of an n-butyl group, an isobutyl group, a sec-butyl group, and a tert-butyl group may be used. When simply referred to as “naphthyl group”, either a 1-naphthyl group or a 2-naphthyl group may be used.

前記構造式（６）において、
Ｒ^６１およびＲ^６２は、それぞれ、水素原子、または直鎖もしくは分枝アルキル基であり、前記アルキル基は、炭素数が４以下の直鎖または分枝アルキル基が好ましく、Ｒ^６１およびＲ^６２は同一でも異なっていても良い。
ｍおよびｌは、それぞれ、任意の正の整数であり、１〜４が好ましく、ｍおよびｌは同一でも異なっていても良い。

なお、前記構造式（５）は、前記一般式（４）の好ましい形態であり、前記構造式（６）および（７）は、前記一般式（１）の好ましい形態である。したがって、前記構造式（５）および（６）において、カウンターイオン等は、前記一般式（１）〜（４）と同様である。前記構造式（６）において、一方のスルホン酸イオン（−ＳＯ_３ ⁻）のカウンターイオンは、前記構造式（６）中のＮ^＋である。もう一方のスルホン酸イオン（−ＳＯ_３ ⁻）のカウンターイオンは、特に制限されないが、例えばアルカリ金属イオンが好ましく、Ｌｉ^＋、Ｎａ^＋、およびＫ^＋からなる群から選択される少なくとも一つが特に好ましい。また、前記構造式（６）で表される化合物（イオン）は、下記構造式（８）で表される化合物（イオン）であることが特に好ましい。

In the color correction filter of the present invention, it is preferable that the cyanine is represented by at least one selected from the group consisting of the following structural formulas (5) to (7).

In the structural formula (6),
R ⁶¹ and R ⁶² are each a hydrogen atom or a linear or branched alkyl group, and the alkyl group is preferably a linear or branched alkyl group having 4 or less carbon atoms, and R ⁶¹ and R ⁶² are It may be the same or different.
m and l are each an arbitrary positive integer, preferably 1 to 4, and m and l may be the same or different.

The structural formula (5) is a preferred form of the general formula (4), and the structural formulas (6) and (7) are preferred forms of the general formula (1). Therefore, in the structural formulas (5) and (6), counter ions and the like are the same as those in the general formulas (1) to (4). In the structural formula (6), the counter ion of one sulfonate ion (—SO ₃ ⁻ ) is N ⁺ in the structural formula (6). The counter ion of the other sulfonate ion (—SO ₃ ⁻ ) is not particularly limited. For example, an alkali metal ion is preferable, and at least one selected from the group consisting of Li ⁺ , Na ⁺ , and K ⁺ is particularly preferable. . The compound (ion) represented by the structural formula (6) is particularly preferably a compound (ion) represented by the following structural formula (8).

In the color correction filter of the invention, the dye is a dye (1-ethyl-2-[(1-ethyl-2 (1H) -quinolinidene)] which is a Br ^- salt of an ion represented by the structural formula (5). Methyl] quinolinium bromide) is particularly preferred. This dye has a particularly narrow half-value width of the maximum absorption peak of the J aggregate (for example, 11 nm or less). By using this dye, it is possible to improve color tone expression while further suppressing a decrease in luminance of the image display device. Because it is possible.

  In the color correction filter of the present invention, the thickness of the color correction layer is preferably in the range of 10 to 500 nm, more preferably in the range of 30 to 400 nm, and still more preferably in the range of 50 to 300 nm. .

  The color correction filter of the present invention may further include a base material, and the color correction layer may be formed on at least one surface of the base material.

  The present invention will be described in detail below.

  In the present invention, the planar shape of the color correction filter is, for example, a rectangle, a square, or a rectangle, but is preferably a rectangle. The color correction filter has a color correction layer containing a J aggregate of a dye.

  As described above, the half width of the maximum absorption peak of the color correction layer is in the range of 5 to 30 nm. When the half width is in the above range, intermediate color light can be selectively removed without absorbing light in a wavelength band necessary for color tone expression (for example, R light). The half width is preferably in the range of 7 to 28 nm, more preferably in the range of 8 to 27 nm, and still more preferably in the range of 8 to 15 nm.

  As described above, the maximum absorption peak wavelength of the color correction layer is preferably in the range of 560 to 610 nm. If the maximum absorption peak wavelength is within the above range, for example, it is not necessary to reduce the relative light emission intensity of light (for example, R light) required for color tone expression.

  As described above, the maximum absorbance in the wavelength range of 560 to 610 nm of the color correction layer is preferably 0.8 or more. The maximum value of the absorbance is more preferably 0.9 or more. The maximum value of the absorbance can be easily achieved by a person skilled in the art without undue trial and error by adjusting the thickness of the color correction layer, for example. Further, the absorbance in the entire wavelength range of 560 to 610 nm of the color correction layer is more preferably 0.8 or more, and further preferably 0.9 or more. The thickness of the color correction layer is as described above.

  In the “J aggregate”, for example, a plurality of dye molecules are associated in a head-to-tail manner with respect to the direction of the transition moment, and a deviation angle between the dye molecules is small (approximately 80 °). Below), it has a one-dimensional structure. The J-aggregate of the dye is characterized in that the light absorption band in the visible light region is shifted to a longer wavelength side and the width is narrower than when the dye is a single molecule. The shift amount is, for example, in the range of 30 to 60 nm. The half width of the maximum absorption peak of the J aggregate is, for example, 30 nm or less. The “J aggregate” is, for example, T. This is described in Kobayashi, “J-Aggregates”, World Scientific (1996).

  Examples of the dye forming the “J aggregate” include cyanine, merocyanine, squarylium, and porphyrin.

  The cyanine is a dye having a structure in which two nitrogen-containing heterocycles are bonded by an odd number of methine groups. Of the two nitrogen-containing heterocycles, nitrogen in one nitrogen-containing heterocycle is a tertiary amine, and nitrogen in the other nitrogen-containing heterocycle is quaternary ammonium. The cyanine is represented by, for example, the general formulas (1) to (4). In a narrow sense, for example, a compound where n = 0 in the formula (2) may be referred to as “cyanine”, and a compound where n = 0 in the formula (3) may be referred to as “isocyanine”. A compound in which n = 0 in the formula (4) is sometimes referred to as “pseudocyanin”. However, in the present invention, as described above, “cyanine” means that two nitrogen-containing heterocycles are bonded with an odd number of methine groups, and the nitrogen in one nitrogen-containing heterocycle is a tertiary amine, Nitrogen in the other nitrogen-containing heterocycle is a generic term for dyes that are quaternary ammonium.

Table 1 below shows specific examples of cyanine represented by the general formula (1). The cyanine in this example is represented by the general formula (1-2) shown in the upper part of Table 1 below, and more specifically, represented by the compound numbers 1-2-1 to 1-2-8 in Table 1 below. Is done.

前記一般式（９）において、
Ｚ^９１およびＺ^９２は、それぞれ、−ＮＨ−、−ＣＨ_２−、−ＣＨ＝ＣＨ−またはヘテロ原子であり、置換基を有していても有していなくても良く、Ｚ^９１およびＺ^９２は同一でも異なっていても良い。前記へテロ原子は、特に制限されないが、例えば、Ｓ、Ｓｅ、Ｏ等が挙げられる。前記置換基としては、特に制限されないが、例えば、アルキル基、ハロゲン原子、オキソ基（＝Ｏ）等が挙げられる。Ｚ^９１およびＺ^９２において、例えば、−ＮＨ−、−ＣＨ_２−または−ＣＨ＝ＣＨ−の水素原子（Ｈ）のうち少なくとも一つが、アルキル基およびハロゲン原子の少なくとも一方で置換されていても良い。また、Ｚ^９１およびＺ^９２において、例えば、前記Ｓ原子が、オキソ基を置換基として有し、ＳＯまたはＳＯ_２であっても良い。前記アルキル基としては、例えば、炭素原子数１〜１０の直鎖または分枝アルキル基が好ましい。
環Ａｒ^９１は、含窒素環との縮合部分以外において不飽和結合を有していても有していなくても良く、芳香族性を有していても有していなくても良く、ヘテロ原子を有していても有していなくても良く、さらに置換基を有していても有していなくても良い。前記置換基は、特に制限されないが、例えば、アルキル基およびハロゲン原子の少なくとも一方が好ましい。前記アルキル基としては、例えば、炭素原子数１〜１２の直鎖または分枝アルキル基が好ましい。環Ａｒ^９１は、特に制限されないが、例えば、５〜１０員環が好ましい。より具体的には、例えば、ベンゼン環、ピリジン環、ナフタレン環等が挙げられる。
Ｒ^９２およびＲ^９３は、それぞれ、水素原子、または直鎖もしくは分枝アルキル基であり、前記アルキル基は、さらにイオン性置換基で置換されていても置換されていなくても良く、Ｒ^９２およびＲ^９３は同一でも異なっていても良い。前記アルキル基としては、例えば、炭素原子数１〜２０の直鎖または分枝アルキル基が好ましい。前記イオン性置換基は、特に制限されないが、アニオン性置換基が好ましく、前記アルキル基の末端が前記イオン性置換基で置換されていることが好ましい。前記アニオン性置換基は、特に制限されないが、例えば、スルホン酸基、カルボン酸基等が挙げられる。より具体的には、例えば、前記アルキル基は、末端がスルホ基で置換されたスルホアルキル基、または末端がカルボキシ基で置換されたカルボキシアルキル基であっても良い。また、前記イオン性置換基のカウンターイオン（対イオン）は、特に制限されない。前記イオン性置換基がアニオン性置換基である場合、カウンターイオン（カチオン）は、例えば、水素イオン、金属イオン、アンモニウムイオン等が挙げられる。前記金属イオンとしては、特に制限されないが、例えば、アルカリ金属イオン、アルカリ土類金属イオン、遷移金属イオン等が挙げられる。前記アルカリ金属イオンとしては、例えば、Ｌｉ^＋、Ｎａ^＋、Ｋ^＋、Ｒｂ^＋、Ｃｓ^＋等が挙げられる。前記アルカリ土類金属イオンとしては、例えば、Ｂｅ^２＋、Ｍｇ^２＋、Ｃａ^２＋、Ｓｒ^２＋、Ｂａ^２＋等が挙げられる。前記アンモニウムイオンとしては、特に制限されないが、例えば、ＮＨ_４ ^＋、アルキルアンモニウムイオン等が挙げられる。前記アルキルアンモニウムイオンとしては、特に制限されないが、例えば、テトラメチルアンモニウムイオン、トリメチルアンモニウムイオン、テトラエチルアンモニウムイオン、トリエチルアンモニウムイオン等が挙げられる。
Ｒ’’は、水素原子、ハロゲン原子、または直鎖もしくは分枝アルキル基であり、前記アルキル基は、好ましくは、炭素原子数１〜１０の直鎖もしくは分枝アルキル基であり、各Ｒ’’は同一でも異なっていても良い。
ｐは、任意の正の整数であり、例えば、１〜３である。 The merocyanine is a nonionic pigment and is represented by, for example, the following general formula (9).

In the general formula (9),
Z ⁹¹ and Z ⁹² are each —NH—, —CH ₂ —, —CH═CH—, or a heteroatom, which may or may not have a substituent. Z ⁹¹ and Z ⁹² May be the same or different. The hetero atom is not particularly limited, and examples thereof include S, Se, and O. Although it does not restrict | limit especially as said substituent, For example, an alkyl group, a halogen atom, an oxo group (= O) etc. are mentioned. In Z ⁹¹ and Z ⁹² , for example, at least one of the hydrogen atoms (H) of —NH—, —CH ₂ —, or —CH═CH— may be substituted with at least one of an alkyl group and a halogen atom. . In Z ⁹¹ and Z ⁹² , for example, the S atom may have an oxo group as a substituent, and may be SO or SO ₂ . As said alkyl group, a C1-C10 linear or branched alkyl group is preferable, for example.
Ring Ar ⁹¹ may or may not have an unsaturated bond other than the condensed portion with the nitrogen-containing ring, and may or may not have aromaticity, and a hetero atom May or may not have, and may or may not have a substituent. The substituent is not particularly limited, but for example, at least one of an alkyl group and a halogen atom is preferable. As said alkyl group, a C1-C12 linear or branched alkyl group is preferable, for example. The ring Ar ⁹¹ is not particularly limited, but is preferably a 5- to 10-membered ring, for example. More specifically, for example, a benzene ring, a pyridine ring, a naphthalene ring and the like can be mentioned.
R ⁹² and R ⁹³ are each hydrogen atom or a linear or branched alkyl group, said alkyl group may be unsubstituted be further substituted with an ionic substituent, R ⁹² and R ⁹³ may be the same or different. As said alkyl group, a C1-C20 linear or branched alkyl group is preferable, for example. The ionic substituent is not particularly limited, but an anionic substituent is preferable, and a terminal of the alkyl group is preferably substituted with the ionic substituent. The anionic substituent is not particularly limited, and examples thereof include a sulfonic acid group and a carboxylic acid group. More specifically, for example, the alkyl group may be a sulfoalkyl group having a terminal substituted with a sulfo group or a carboxyalkyl group having a terminal substituted with a carboxy group. Further, the counter ion (counter ion) of the ionic substituent is not particularly limited. When the ionic substituent is an anionic substituent, examples of the counter ion (cation) include a hydrogen ion, a metal ion, and an ammonium ion. Although it does not restrict | limit especially as said metal ion, For example, an alkali metal ion, an alkaline-earth metal ion, a transition metal ion etc. are mentioned. Examples of the alkali metal ion include Li ⁺ , Na ⁺ , K ⁺ , Rb ⁺ , Cs ^{+ and the} like. Examples of the alkaline earth metal ions include Be ²⁺ , Mg ²⁺ , Ca ²⁺ , Sr ²⁺ , Ba ^{2+ and the} like. Examples of the ammonium ion is not particularly limited, for example, NH 4 ^_+, alkylammonium ion, and the like. The alkylammonium ion is not particularly limited, and examples thereof include tetramethylammonium ion, trimethylammonium ion, tetraethylammonium ion, and triethylammonium ion.
R ″ is a hydrogen atom, a halogen atom, or a linear or branched alkyl group, and the alkyl group is preferably a linear or branched alkyl group having 1 to 10 carbon atoms, and each R ′ 'May be the same or different.
p is an arbitrary positive integer, for example, 1 to 3.

Table 2 below shows specific examples of the merocyanine represented by the general formula (9). The merocyanine in this example is represented by the general formula (9-2) shown in the upper part of Table 2 below, and more specifically, represented by the compound numbers 9-2-1 to 9-2-16 in Table 2 below. Is done.

前記一般式（１０）において、Ｒ^１０１〜Ｒ^１０４は、それぞれ、アルキル基であり、好ましくは炭素数６以下の直鎖または分枝アルキル基であり、Ｒ^１０１〜Ｒ^１０４は同一でも異なっていても良い。Ｘ^１〜Ｘ^８は、それぞれ、水素原子、ハロゲン原子、アルキル基、アルコキシ基または水酸基であり、前記アルキル基としては、メチル基またはエチル基が特に好ましく、前記アルコキシ基としてはメトキシ基が特に好ましく、Ｘ^１〜Ｘ^８は同一でも異なっていても良い。 The square lilium is represented, for example, by the following general formula (10).

In the general formula (10), R ^{101 to} R ¹⁰⁴ are each an alkyl group, preferably a linear or branched alkyl group having 6 or less carbon atoms, and R ^{101 to} R ¹⁰⁴ are the same or different. Also good. X ^{1 to} X ⁸ are each a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group or a hydroxyl group, and the alkyl group is particularly preferably a methyl group or an ethyl group, and the alkoxy group is particularly preferably a methoxy group. , X ^{1 to} X ⁸ may be the same or different.

前記式（１１）において、Ｒ^１１１〜Ｒ^１１８およびＲ^１１１a〜Ｒ^１１１ｄは、それぞれ、アルキル基、水素原子またはフェニル基であり、前記アルキル基は炭素数４以下の直鎖もしくは分枝アルキル基が好ましく、Ｒ^１１１〜Ｒ^１１８は同一でも異なっていても良い。前記Ｒ^１１１〜Ｒ^１１８において、前記フェニル基は、置換基を有していても良いし有していなくても良い。前記置換基は、特に制限されないが、例えば、アルキル基、ハロゲン原子、スルホ基およびカルボキシル基からなる群から選択される少なくとも一つが好ましい。前記アルキル基としては、例えば、炭素原子数１〜１２の直鎖または分枝アルキル基がより好ましい。また、前記ポルフィリンは、その中心に配位金属を有するポルフィリン錯体であってもよい。前記配位金属としては、特に制限されないが、例えば、亜鉛、鉄、コバルト、ルテニウムまたはガリウムのイオンが挙げられ、より具体的には、例えば、Ｚｎ（ＩＩ）、Ｇａ（ＩＩＩ）、Ｆｅ（ＩＩ）、Ｆｅ（ＩＩＩ）、Ｃｏ（ＩＩ）、Ｃｏ（ＩＩＩ）、Ｒｕ（ＩＩ）およびＲｕ（ＩＩＩ）等が挙げられる。また、前記配位金属は、金属イオンのみに限定されず、例えば、金属ハロゲン化物、金属酸化物、金属水酸化物、Ｓｉ、Ｇｅ、もしくはＰ等であっても良い。 The porphyrin is a macrocyclic compound in which four pyrrole rings are alternately bonded to four methine groups at the α position and a derivative thereof, and is represented by, for example, the following general formula (11).

In the formula (11), R ^{111 to} R ¹¹⁸ and R ^{111a to} R ^111d are each an alkyl group, a hydrogen atom or a phenyl group, and the alkyl group is a linear or branched alkyl group having 4 or less carbon atoms. Preferably, R ^{111 to} R ¹¹⁸ may be the same or different. In R ^{111 to} R ¹¹⁸ , the phenyl group may or may not have a substituent. The substituent is not particularly limited, but for example, at least one selected from the group consisting of an alkyl group, a halogen atom, a sulfo group, and a carboxyl group is preferable. As said alkyl group, a C1-C12 linear or branched alkyl group is more preferable, for example. The porphyrin may be a porphyrin complex having a coordination metal at the center thereof. Although it does not restrict | limit especially as said coordination metal, For example, the ion of zinc, iron, cobalt, ruthenium, or gallium is mentioned, More specifically, for example, Zn (II), Ga (III), Fe (II ), Fe (III), Co (II), Co (III), Ru (II) and Ru (III). The coordination metal is not limited to metal ions, and may be, for example, a metal halide, metal oxide, metal hydroxide, Si, Ge, or P.

  These dyes may be used alone or in combination of two or more. Further, these dyes may be used as a complex of nickel, copper, cobalt, iron or the like in order to increase the fastness.

前記式（１２）および（１３）において、Ｒ^１２１およびＲ^１３１は、それぞれ、水素原子または直鎖もしくは分枝アルキル基であり、Ｒ^１２１およびＲ^１３１は同一でも異なっていても良い。前記アルキル基としては、例えば、炭素原子数１〜１２の直鎖または分枝アルキル基が好ましい。また、前記構造式（１２）および（１３）中、−Ｃ_１８Ｈ_３７（オクタデシル基）は、それぞれ、直鎖状でも分枝状でも良いが、直鎖状であることが好ましい。 The dye of the present invention particularly preferably comprises, for example, a cyanine represented by any one of the structural formulas (5) to (8) and a merocyanine represented by the following structural formula (12) or (13). It is at least one selected from the group.

In the formulas (12) and (13), R ¹²¹ and R ¹³¹ are each a hydrogen atom or a linear or branched alkyl group, and R ¹²¹ and R ¹³¹ may be the same or different. As said alkyl group, a C1-C12 linear or branched alkyl group is preferable, for example. In the structural formulas (12) and (13), —C ₁₈ H ₃₇ (octadecyl group) may be linear or branched, but is preferably linear.

Table 3 below shows specific examples of cyanine represented by the structural formula (6). The cyanine in this example is represented by compound numbers 6-1 to 6-8 in Table 3 below.

  The color correction filter of the present invention is, for example, an optical member constituting a liquid crystal display device (LCD) described later, such as a composite member in which the color correction layer is formed on a polarizing plate, a retardation plate, a light guide plate, or the like. The form may be sufficient and the form of a member (single member) independent of these members may be sufficient. In the form of the composite member, the color correction filter of the present invention may further include a base material, and the color correction layer may be formed on at least one surface of the base material. Good. Here, the form of the single member is, for example, a form of the color correction layer alone in which the color correction layer is peeled off from the substrate. In the form of the single member, the total thickness of the color correction filter of the present invention is preferably in the range of 1 to 1000 μm in consideration of ease of handling and the thickness of the entire liquid crystal display device. Furthermore, in the form including the base material, the color correction filter of the present invention may be produced by directly forming the color correction layer on at least one surface of the base material, as described later, You may produce the said color correction filter of this invention of the said single member, and the said base material by bonding together through an adhesive, an adhesive agent, etc.

  Next, a method for forming the color correction layer will be described with an example. However, the method for forming the color correction layer is not limited to this example.

  First, the dye is dissolved in a solvent to prepare a dye solution. Examples of the solvent include water, alcohol, ketone, chlorine-based solvent, fluorine-based solvent, or a mixed solvent thereof.

  Next, the said pigment | dye solution is apply | coated on the said optical member or the said base material at room temperature, a coating film is formed, and it is made to dry. In this way, a color correction layer containing a J aggregate of the dye can be formed. The coating method of the dye solution is appropriately selected according to the desired thickness and shape of the color correction layer, the material of the base material, etc., for example, spin coating method, coating method, adsorption method, vapor deposition method, etc. Can be mentioned.

  In the color correction layer, if the J aggregate of the dye is formed, the light absorption band of the color correction layer does not include the J aggregate of the dye included in the color correction layer (for example, in a solution state) While shifting to a longer wavelength side, the width becomes narrower. From this, it can be determined that a J aggregate of the dye is formed in the color correction layer.

  The color correction layer may further contain various additives. Examples of the additive include an antioxidant for preventing deterioration of the dye, an ultraviolet ray inhibitor, a singlet oxygen scavenger, and a refractive index adjusting agent for imparting various functions. The additive may be used alone or in combination of two or more. The amount of the additive added is, for example, 50% by weight or less, preferably 30% by weight or less, more preferably 20% by weight or less with respect to the dye, taking into account the ease of formation of J aggregates. % By weight or less. When the color correction filter of the present invention includes the base material, the base material may include the additive in addition to or instead of the color correction layer.

  FIG. 3 is a sectional view showing an example of the color correction filter of the present invention in the form of a composite member including the base material. As illustrated, the color correction filter 10 includes a base material 11 and a color correction layer 12 as main components. In this example, the color correction layer 12 is formed on one side of the substrate 11. However, the present invention is not limited to this. In the color correction filter of the present invention, the color correction layer may be formed on both surfaces of the base material. In this example, the substrate 11 and the color correction layer 12 are each a single layer. However, the present invention is not limited to this. In the color correction filter of the present invention, the base material and the color correction layer may each have a multi-layer structure in which two or more layers are stacked. When the base material and the color correction layer have a multi-layer structure, the layers of the base material and the color correction layer may be the same or different.

  The substrate is preferably excellent in light transmittance. The base material may be formed of an organic material or an inorganic material. Examples of the organic material include polyacrylic resin, polycarbonate resin, polyvinyl alcohol resin, polyester resin, polyarylate resin, cellulose resin, ionic polymer, and gelatin. Examples of the polyacrylic resin include polymethyl methacrylate, polymethyl acrylate, and polybutyl acrylate. The polycarbonate resin includes, for example, polyoxycarbonyloxyhexamethylene, polyoxycarbonyloxy-1,4-isopropylidene-1,4-phenylene and the like. Examples of the polyvinyl alcohol-based resin include polyvinyl formal, polyvinyl acetal, polyvinyl butyral, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, and the like. Examples of the polyester resin include polybutylene terephthalate and polytetramethyl phthalate. The polyarylate resin includes, for example, polyamide, polyetherimide, and the like. The cellulose resin includes, for example, methyl cellulose, ethyl cellulose, and derivatives thereof. The ionic polymer includes, for example, polydimethyldiallylammonium chloride. Examples of the inorganic material include silicon oxide glass, titanium oxide, aluminum oxide, zinc oxide, and a film formed from hydrolysis contractions of various metal alkoxides. Among these, polyvinyl alcohol resin, polyacrylic resin, ionic polymer, and gelatin are preferable. The base material may be formed from a single material, or may be formed from two or more types of the materials.

  The surface shape of the substrate may be smooth as shown in FIG. 3 or may be a shape processed to give some function. Examples of the shape processed for imparting the function include a prism shape for improving luminance and a lens array shape.

  The thickness of the substrate is not particularly limited, but is, for example, in the range of 5 to 100 μm, preferably in the range of 10 to 90 μm, and more preferably in the range of 20 to 80 μm.

  The absorption spectrum, the maximum absorption peak wavelength, and the half width of the maximum absorption peak of the color correction filter of the present invention are the same as or substantially equal to the absorption spectrum, the maximum absorption peak wavelength, and the half width of the maximum absorption peak of the color correction layer. For this reason, if the said characteristic of the said color correction layer is measured, the said characteristic of the color correction filter of this invention containing it can be grasped | ascertained. Further, if the characteristic of the color correction filter of the present invention is measured, the characteristic of the color correction layer included therein can be grasped.

  The color correction filter of the present invention can be preferably used for various image display devices such as a liquid crystal display device (LCD) and an EL display (ELD). FIG. 4 is a cross-sectional view showing an example of the configuration of a liquid crystal display device using the color correction filter of the present invention. In addition, in the same figure, in order to make it intelligible, the magnitude | size, ratio, etc. of each structural member differ from actual. As shown in the figure, this liquid crystal display device includes the color correction filter 10 of the present invention, a liquid crystal panel 41, a light source device (cold cathode tube) 44, and a light guide plate 45 as main components. The liquid crystal panel 41 has a configuration in which a first polarizing plate 431 and a second polarizing plate 432 are disposed on both sides of the liquid crystal cell 42, respectively. The liquid crystal cell 42 includes a liquid crystal layer 240 at the center thereof. A first alignment film 451 and a second alignment film 452 are disposed on both sides of the liquid crystal layer 240, respectively. A first transparent electrode 461 and a second transparent electrode 462 are disposed outside the first alignment film 451 and the second alignment film 452, respectively. On the outside of the first transparent electrode 761, a predetermined arrangement of R, G, B, etc. color filters 470 and a black matrix 490 are disposed via a protective film 480. A first substrate 401 and a second substrate 402 are disposed outside the color filter 470, the black matrix 490, and the second transparent electrode 462, respectively. In the liquid crystal panel 41, the first polarizing plate 431 side is the display surface side, and the second polarizing plate 432 side is the back surface side. The light guide plate 45 is arranged in parallel on the back side of the liquid crystal panel 41 so as to overlap the liquid crystal panel 41. The light source device 44 is disposed on the opposite side of the light guide plate 45 from the liquid crystal panel 41. The color correction filter 10 of the present invention is disposed outside the first polarizing plate 431 (upper side in the figure). However, in the liquid crystal display device of the present invention, the arrangement position of the color correction filter of the present invention is not limited to this example. In the present invention, the color correction filter 10 of the present invention may be disposed at any position between the light source device 44 and the display surface side (upper side in the drawing) of the liquid crystal display device. The color correction filter 10 of the present invention is disposed between the light source device 44 and the light guide plate 45, between the light guide plate 45 and the liquid crystal panel 41, and between the second polarizing plate 432 and the liquid crystal cell. 42 between the light guide plate 45 and the liquid crystal panel 41 and between the light guide plate 45 and the liquid crystal panel 41 (upper side in the figure). ) Is more preferable. Further, the liquid crystal display device of this example includes one color correction filter 10. However, the present invention is not limited to this. The liquid crystal display device of the present invention may include a plurality of the color correction filters of the present invention.

  In the liquid crystal display device of this example, the improvement of the color tone expression is performed, for example, as follows. The cold cathode tube 44 has emission peaks of B near the wavelength of 435 to 480 nm, G near the wavelength of 500 to 560 nm, and R around the wavelength of 610 to 750 nm. Here, the color correction filter 10 of the present invention is one having a maximum absorption peak wavelength of the color correction layer in the range of 560 to 610 nm. By doing so, light in the wavelength range of 560 to 610 nm is selectively absorbed and removed by the color correction filter 10 of the present invention. Thereby, the color tone expression of the light (particularly R light) emitted from the cold cathode tube 44 is improved. Further, in the liquid crystal display device of this example, the half-value width of the maximum absorption peak of the color correction layer is as narrow as 5 to 30 nm. For this reason, light in a wavelength band necessary for color tone expression (for example, R light) is not absorbed, and a decrease in luminance is suppressed.

  FIG. 5 is a cross-sectional view showing another example of the configuration of the liquid crystal display device using the color correction filter of the present invention. In this figure, the same parts as those in FIG. In the liquid crystal display device of this example, the light source device 44 is a pseudo white light source that produces white light by the light emission of the blue LED and the yellow light emission of YAG. The light source device 44 is disposed beside the light guide plate 45 (on the right side in the figure). Except for these, the liquid crystal display device of this example has the same configuration as the liquid crystal display device shown in FIG. As described above, the pseudo white light source includes more of the intermediate color than the cold cathode tube. However, in the liquid crystal display device of the present invention, even when the pseudo white light source is used, the color correction filter 10 of the present invention selectively absorbs and removes the light of the intermediate color. While suppressing, it is possible to improve color tone expression.

  The liquid crystal display device of the present invention is not limited to the examples shown in FIGS. For example, the liquid crystal display device of the present invention may further include various optical members such as a retardation plate, a diffusion plate, an antiglare layer, an antireflection layer, a protective plate, a prism array, and a lens array sheet.

  The image display device of the present invention is used for any appropriate application. Applications include, for example, OA equipment such as desktop personal computers, notebook personal computers, and copiers, mobile phones, watches, digital cameras, personal digital assistants (PDAs), portable devices such as portable game machines, video cameras, televisions, microwave ovens, etc. Household electrical equipment, back monitor, car navigation system monitor, car audio and other in-vehicle equipment, display equipment for commercial store information monitors, security equipment such as monitoring monitors, nursing care monitors, medical monitors, etc. Nursing care / medical equipment.

  Next, examples of the present invention will be described together with comparative examples. The present invention is not limited or restricted by the following examples and comparative examples. In addition, various properties and physical properties in each example and each comparative example were measured and evaluated by the following methods.

(1) Absorption spectrum of dye solution, color correction layer and color correction filter, maximum absorption peak wavelength and half width of maximum absorption peak The absorption spectrum of the dye solution, color correction layer and color correction filter was measured with an ultraviolet-visible spectrophotometer (Japan). It was measured using a spectroscopic (trade name, “V-560”). From the measured absorption spectrum, the maximum absorption peak wavelength and the half width of the maximum absorption peak of the dye solution, the color correction layer, and the color correction filter were obtained.

(2) Chromaticity coordinate x value of liquid crystal display device The chromaticity coordinate x value of the liquid crystal display device was measured by a trade name “MCPD3000” manufactured by Otsuka Electronics Co., Ltd. Note that the higher the chromaticity coordinate x value of the liquid crystal display device, the better the tone expression of the R light.

[Example 1]
The Br of structure (5) represented by ion ^- is a salt dye (1-ethyl-2 - [(1-ethyl-2 (IH) - Kinoriniden) methyl] quinolinium bromide, Inc. Hayashibara Biological Chemical Laboratories) was added to 0.15% by weight of ethanol and dissolved. While this pigment solution is dropped on a base material (silicon oxide glass plate, thickness 1 mm) at room temperature, it is applied by spin coating under a condition of 1000 times / minute × 30 seconds to form a coating film, followed by drying. I let you. Thus, the color correction filter of the present Example was obtained by forming the color correction layer containing the J aggregate of the said pigment | dye on the single side | surface of the said base material. Using this color correction filter, a liquid crystal display device having the configuration shown in FIG. 4 was produced.

  The graph of FIG. 1 shows absorption spectra of the dye solution and the color correction layer. In the figure, PA is an absorption spectrum of the dye solution, and JA is an absorption spectrum of the color correction layer. As can be seen from FIG. 1, the maximum absorption peak wavelength (577 nm) of the color correction layer was located on the longer wavelength side than the maximum absorption peak wavelength (523 nm) of the dye solution. In addition, the half-value width (10 nm) of the maximum absorption peak of the color correction layer was narrower than the half-value width (34 nm) of the maximum absorption peak of the ethanol solution of the dye. From this, it was determined that a J-aggregate of the dye was formed in the color correction layer.

[Example 2]
A dye (5,6-dichloro-2- [3- [5,6-dichloro-1-ethyl-3- (3-sulfopropyl-2) which is a Na ⁺ salt of an ion represented by the structural formula (8). (3H) -benzimidazolylidene) -1-propenyl] -1-ethyl-3- (3-sulfopropyl) benzimidazolium hydroxy sodium salt (manufactured by Hayashibara Biochemical Laboratories Co., Ltd.) with respect to the solvent. It was added and dissolved so as to be 12% by weight. As the solvent, a mixed solvent of 1,1,2,2,3,3-hexafluoro-2-propanol / ethanol = 5/3 (% by weight) was used. While this pigment solution is dropped on a substrate (polyvinyl alcohol film, thickness 50 μm) at room temperature, it is applied by a spin coating method under the conditions of 1000 times / minute × 30 seconds to form a coating film and dried. It was. Thus, the color correction filter of the present Example was obtained by forming the color correction layer containing the J aggregate of the said pigment | dye on the single side | surface of the said base material. Using this color correction filter, a liquid crystal display device having the configuration shown in FIG. 4 was produced.

  The graph of FIG. 2 shows absorption spectra of the dye solution and the color correction layer. In the figure, PA is an absorption spectrum of the dye solution, and JA is an absorption spectrum of the color correction layer. As can be seen from FIG. 2, the maximum absorption peak wavelength (587 nm) of the color correction layer was located on the longer wavelength side than the maximum absorption peak wavelength (520 nm) of the dye solution. Further, the half-value width (24 nm) of the maximum absorption peak of the color correction layer was narrower than the half-value width (33 nm) of the maximum absorption peak of the ethanol solution of the dye. From this, it was determined that a J-aggregate of the dye was formed in the color correction layer.

[Comparative Example 1]
A liquid crystal display device having the structure shown in FIG. 6 was produced.

[Comparative Example 2]
As a dye, an I ^- salt (3-ethyl-2- [5- (3-ethyl-2 (3H) -benzoxazolylidene) -1,3-pentadienyl] represented by the following structural formula (14) A color correction filter of this comparative example was obtained in the same manner as in Example 1 except that (benzoxazolium iodide) was used. Using this color correction filter, a liquid crystal display device having the configuration shown in FIG. 4 was produced.

  Table 4 below shows the evaluation results of various characteristics and physical properties of the color correction filter and the liquid crystal display device in each example and each comparative example. In Table 4 below, the relative luminance represents the relative luminance of the liquid crystal display devices of Examples 1 and 2 and Comparative Example 2 when the luminance of the liquid crystal display device of Comparative Example 1 is 1 (reference). .

(Table 4)
Maximum absorption peak wavelength (nm) Half width (nm) Chromaticity coordinate x value Relative luminance
Example 1 576 10.4 0.65 0.94
Example 2 591 26 0.66 0.95
Comparative Example 1 − − 0.6 1
Comparative Example 2 585 38 0.67 0.70

  As can be seen from Table 4, in Examples 1 and 2 where the half-value width of the maximum absorption peak of the color correction filter was in the range of 5 to 30 nm, compared to Comparative Example 1 in which no color correction filter was used, the liquid crystal display The chromaticity coordinate x value of the device became high. In Examples 1 and 2, although the luminance of the liquid crystal display device was slightly lower than that in Comparative Example 1, it was at a level where there was no practical problem at all. On the other hand, in Comparative Example 2 in which the half-value width of the maximum absorption peak of the color correction filter was 38 nm, the chromaticity coordinate x value of the liquid crystal display device was higher than that in Comparative Example 1, but the luminance of the liquid crystal display device was high. Decreased significantly.

  As described above, the color correction filter of the present invention can improve the color tone expression of the image display device by removing the intermediate color light while suppressing the decrease in luminance of the image display device. Applications of the color correction filter of the present invention and an image display device using the same are, for example, OA devices such as desktop personal computers, notebook personal computers, copiers, mobile phones, watches, digital cameras, personal digital assistants (PDAs), and portable games. Portable equipment such as video cameras, home electrical equipment such as video cameras, televisions, microwave ovens, back monitors, car navigation system monitors, car audio and other in-vehicle equipment, commercial store information monitors and other exhibition equipment, for monitoring Security devices such as monitors, nursing care and medical devices such as nursing monitors, medical monitors, and the like can be mentioned, but their uses are not limited and they can be applied to a wide range of fields.

FIG. 1 is a graph showing absorption spectra of a dye solution and a color correction layer in one example of the present invention. FIG. 2 is a graph showing absorption spectra of a dye solution and a color correction layer in another example of the present invention. FIG. 3 is a cross-sectional view showing an example of the configuration of the color correction filter of the present invention. FIG. 4 is a cross-sectional view showing an example of the configuration of the liquid crystal display device of the present invention. FIG. 5 is a cross-sectional view showing another example of the configuration of the liquid crystal display device of the present invention. FIG. 6 is a cross-sectional view showing an example of the configuration of a conventional liquid crystal display device.

Explanation of symbols

10 color correction filter 41, 61 Liquid crystal panel 42, 62 Liquid crystal cell 44, 64 Light source device 45, 65 Light guide plate 401, 601 First substrate 402, 602 Second substrate 431, 631 First polarizing plate 432, 632 First Two polarizing plates 440 and 640 Liquid crystal layers 451 and 651 First alignment films 452 and 652 Second alignment films 461 and 661, first transparent electrodes 462 and 662 Second transparent electrodes 470 and 670 Color filters 480 and 680 Protective film 490, 690 Black matrix

Claims (10)

A color correction layer containing a J aggregate of a dye;
The dye is at least one dye selected from the group consisting of cyanine, merocyanine, squarylium and porphyrin;
A color correction filter, wherein a half width of a maximum absorption peak of the color correction layer is in a range of 5 to 30 nm. The color correction filter according to claim 1, wherein a maximum absorption peak wavelength of the color correction layer is in a range of 560 to 610 nm. The color correction filter according to claim 1 or 2, wherein the maximum value of absorbance in the wavelength range of 560 to 610 nm of the color correction layer is 0.8 or more. The color correction filter according to claim 1, wherein the pigment is cyanine. The color correction filter according to claim 4, wherein the cyanine is represented by at least one formula selected from the group consisting of the following general formulas (1) to (4).

In the general formula (1),
Z ¹¹ and Z ¹² are each —NH—, —CH ₂ —, —CH═CH—, or a heteroatom, which may or may not have a substituent. Z ¹¹ and Z ¹² Can be the same or different,
Each of the rings Ar ¹¹ and Ar ¹² may or may not have an unsaturated bond other than the condensed portion with the nitrogen-containing ring, and may or may not have aromaticity. Or may have a heteroatom, may or may not have a substituent, and the rings Ar ¹¹ and Ar ¹² may be the same or different. ,
R ¹¹ and R ¹² are each hydrogen atom or a linear or branched alkyl group, said alkyl group may not be further substituted or substituted with an ionic substituent, R ¹¹ and R ¹² may be the same or different,

In the general formulas (2) to (4),
R is a hydrogen atom, or a linear or branched alkyl group, and each R may be the same or different,

In the general formulas (1) to (4),
R ′ is a hydrogen atom, a linear or branched alkyl group, or an aromatic group, and each R ′ may be the same or different,
n is 0 or any positive integer, and each n may be the same or different. The color correction filter according to claim 5, wherein the cyanine is represented by at least one formula selected from the group consisting of the following structural formulas (5) to (7).

In the structural formula (6),
R ⁶¹ and R ⁶² are each a hydrogen atom or a linear or branched alkyl group, and R ⁶¹ and R ⁶² may be the same or different,
m and l are arbitrary positive integers, and may be the same or different. The color correction filter according to claim 1, wherein a thickness of the color correction layer is in a range of 10 to 500 nm. The color correction filter according to claim 1, further comprising a base material, wherein the color correction layer is formed on at least one surface of the base material. An image display device including a color correction filter, wherein the color correction filter is the color correction filter according to any one of claims 1 to 8. A liquid crystal display device including a color correction filter, wherein the color correction filter is a color correction filter according to any one of claims 1 to 8.

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