JP2008298814A - Substrate for liquid crystal display device and liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a substrate for a liquid crystal display device, the substrate capable of optimizing color viewing angles and contrast of a liquid crystal display device in a vertically aligned (VA) mode, an in-plane switching (IPS) mode or the like when the substrate is used for such a liquid crystal display device. <P>SOLUTION: The substrate for a liquid crystal display device includes a substrate, a color filter layer 13 having regions of three colors R, G, B, and a uniaxial optical anisotropic layer 15 having the optical axis within the plane and patterned into regions having front retardations Re(R), Re(G) and Re(B) corresponding to the respective color regions, and the substrate satisfies expression (1):¾Re(R)-Re(G)¾<¾Re(G)-Re(B)¾. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device substrate and a liquid crystal display device, and more particularly to a liquid crystal display device substrate and a liquid crystal display device capable of improving a color viewing angle.

  CRT (Cathode Ray Tube) has been mainly used as a display device used for OA devices such as word processors, notebook personal computers, personal computer monitors, portable terminals, and televisions. In recent years, liquid crystal display devices have been widely used instead of CRTs because of their thinness, light weight, and low power consumption. A liquid crystal display (LCD) has a liquid crystal cell and a polarizing plate. The polarizing plate is composed of a protective film and a polarizing film, and is obtained by dyeing a polarizing film made of a polyvinyl alcohol film with iodine, stretching, and laminating both surfaces with a protective film. For example, in a transmissive liquid crystal display device, the polarizing plate is attached to both sides of the liquid crystal cell, and one or more optical compensation sheets may be disposed. On the other hand, in a reflective liquid crystal display device, a reflector, a liquid crystal cell, one or more optical compensation sheets, and a polarizing plate are arranged in this order. The liquid crystal cell includes a liquid crystal molecule, two substrates for encapsulating the liquid crystal molecule, and an electrode layer for applying a voltage to the liquid crystal molecule. The liquid crystal cell performs ON / OFF display depending on the alignment state of liquid crystal molecules, and can be applied to any of a transmissive type, a reflective type, and a semi-transmissive type, such as TN (Twisted Nematic), IPS (In-Plane Switching), Display modes such as OCB (Optically Compensatory Bend), VA (Vertically Aligned), ECB (Electrically Controlled Birefringence), and STN (Super Twisted Nematic) are proposed. However, the color and contrast that can be displayed by a conventional liquid crystal display device vary depending on the angle at which the LCD is viewed. For this reason, the viewing angle characteristics of liquid crystal display devices have not yet exceeded the performance of CRT.

  In order to improve the viewing angle characteristics, a viewing angle compensation phase difference plate (optical compensation sheet) has been applied. Until now, LCDs having excellent contrast viewing angle characteristics have been proposed by using optical compensation sheets having various optical characteristics for the various display modes described above. In particular, the three modes of OCB, VA, and IPS have wide viewing angle characteristics in all directions as wide viewing angle modes. In recent years, large-sized displays exceeding 30 inches have already spread to homes for television applications. I'm starting.

  The VA mode has not only excellent display characteristics when viewed from the front, but also exhibits a wide viewing angle characteristic by applying an optical compensation film for viewing angle compensation. The LCD mode is widespread. In the VA mode, a uniaxially oriented retardation plate (positive a-plate) having a positive refractive index anisotropy in the direction of the film surface and a negative uniaxial retardation plate having an optical axis in a direction perpendicular to the film surface By using (negative c-plate), a wider viewing angle characteristic can be realized (see Patent Document 1). In addition, the IPS mode in which the orientation of liquid crystal molecules is controlled to widen the viewing angle is also widespread. In the IPS mode, a uniaxially oriented retardation plate (positive positive film having positive refractive index anisotropy in the direction of the film surface). It is also known that a wider viewing angle characteristic can be realized by using a negative uniaxial retardation plate (positive c-plate) having an optical axis in a direction perpendicular to a-plate and a film surface. (See Patent Document 1, pages 12-13, FIG. 54)

  However, although the method using the optical compensation film can effectively improve the contrast viewing angle characteristics, the improvement effect on the color viewing angle characteristics is not sufficient, and the improvement of the color viewing angle characteristics is an important issue for LCDs. The color viewing angle characteristic of the LCD is derived from the fact that the wavelength changes in three typical colors of R, G, and B, so that the change due to the phase difference of the polarization is different even with the same phase difference. In order to optimize this, the wavelength dependence of the birefringence of the optically anisotropic material, that is, the birefringence wavelength dispersion is optimized with respect to R, G, and B. In the current LCD, since the birefringence wavelength dispersion of liquid crystal molecules used for ON / OFF display and the birefringence wavelength dispersion of the optical compensation film cannot be easily controlled, the color viewing angle characteristics have not been improved sufficiently.

Therefore, in order to improve the color viewing angle characteristics, optical compensation is performed independently for the three colors of R, G, and B mainly by using a patterning method in the liquid crystal cell together with a color filter. A method (see Patent Document 2) has been proposed. Further, at this time, it has been proposed that the thickness of the R region> the thickness of the G region> the thickness of the B region, and the thicker the optical compensation layer is in the layer through which transmitted light having a long wavelength passes (Patent Document). 3 and 4).
JP-A-10-153802 JP 2004-37837 A JP 2004-240102 A JP 2005-24919 A

  The present invention relates to a substrate for a liquid crystal display device having a color filter layer and an optically anisotropic layer capable of performing optical compensation independently for each color indicated by the color filter layer, wherein the vertical alignment (VA) mode and An object is to provide a substrate for a liquid crystal display device that can optimize the color viewing angle and contrast of the device when applied to a liquid crystal display device such as a horizontal alignment (IPS) mode.

That is, the present invention provides the following [1] to [8].
[1] A substrate, a color filter layer having three color regions of R, G, and B, and a front retardation of Re (R), Re (G), and Re (B), respectively, corresponding to the region. A substrate for a liquid crystal display device, which includes a positive uniaxial optically anisotropic layer having an optical axis in a plane in which a region is patterned, and satisfies the following formula (1).
Formula (1) | Re (R) -Re (G) | <| Re (G) -Re (B) |
[2] The film thicknesses of the regions having front retardation of Re (R), Re (G), and Re (B) in the optically anisotropic layer are respectively d (R), d (G), and d (B ), The liquid crystal display device substrate according to [1], which satisfies the following formula (2):
Formula (2) | d (R) -d (G) | <| d (G) -d (B) |

[3] The substrate for liquid crystal display device according to [2], wherein d (R) = d (G)> d (B).
[4] The substrate for a liquid crystal display device according to [2], wherein d (G)> d (R)> d (B).
[5] The substrate for a liquid crystal display device according to any one of [1] to [4], including a uniaxial optically anisotropic layer having an optical axis in a normal direction of the substrate surface.
[6] A liquid crystal display substrate according to [5], a backlight-side liquid crystal display substrate, and a liquid crystal layer are included as a display-side liquid crystal display substrate between the pair of polarizing plates. A liquid crystal display device including a liquid crystal cell.

[7] A liquid crystal display substrate according to any one of [1] to [4] as a liquid crystal display substrate on the display side between the pair of polarizing plates and the pair of polarizing plates, the backlight side liquid crystal A uniaxial optical anisotropy including a display device substrate and a liquid crystal cell including a liquid crystal layer, and one of the polarizing plates or the backlight side liquid crystal display device substrate has an optical axis in a normal direction of the substrate surface Liquid crystal display device comprising a layer.
[8] The liquid crystal display device according to [6] or [7], wherein the alignment mode of the liquid crystal layer is a VA mode, an IPS mode, or an FFS mode.

  By applying the substrate for a liquid crystal display device of the present invention, the color viewing angle can be improved over a wide range in a liquid crystal display device such as a vertical alignment (VA) mode and a horizontal alignment (IPS) mode, and a high contrast image can be obtained. Display is possible.

  Hereinafter, the present invention will be described in detail. In the present specification, “to” is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value.

  In this specification, “substantially” for the angle means that the error from the exact angle is within a range of less than ± 5 °. Furthermore, the error from the exact angle is preferably less than 4 °, more preferably less than 3 °. “Substantially” in terms of retardation and film thickness means a difference within ± 5%. Moreover, the measurement wavelength of retardation indicates an arbitrary wavelength in the visible light region unless otherwise specified. In the present specification, “visible light” refers to light having a wavelength of 400 to 700 nm.

  The substrate for a liquid crystal display device of the present invention is formed such that a positive uniaxial optically anisotropic layer having an optical axis in the substrate surface substantially contacts a color filter layer of each color existing on the liquid crystal layer side of the substrate. Further, the optically anisotropic layer is patterned corresponding to each color region in the color filter layer in order to perform viewing angle compensation corresponding to each color region in the color filter layer. In this specification, the region in the uniaxial optical anisotropic layer having the optical axis in the substrate surface patterned according to the three color regions of R, G, and B of the color filter layer provided on the substrate is: Suppose that each has front retardation represented by Re (R), Re (G), and Re (B), respectively, and the film thicknesses are d (R), d (G), and d (B), respectively. Suppose that

The patterning uniaxial optically anisotropic layer having an optical axis in the substrate plane in the substrate for a liquid crystal display device of the present invention satisfies the relationship of the following formula (1).
Formula (1) | Re (R) -Re (G) | <| Re (G) -Re (B) |
Furthermore, it is preferable that the patterning uniaxial optically anisotropic layer having the optical axis in the substrate surface in the substrate for a liquid crystal display device of the present invention satisfies the relationship of the following formula (2).
Formula (2) | d (R) -d (G) | <| d (G) -d (B) |

  A positive uniaxial optically anisotropic layer having an optical axis in the substrate plane may be formed anywhere on the two liquid crystal display device substrates forming the liquid crystal cell, but the TFT array process is usually performed at 300 ° C. for silicon formation. Since the above high temperature process is required, it is preferable to use it as a substrate for a liquid crystal display device on the side having a color filter layer. When the optically anisotropic layer is provided on the liquid crystal display substrate on the side having the TFT layer, it is preferably provided above the silicon layer of the TFT. In the substrate for a liquid crystal display device of the present invention, a positive uniaxial optically anisotropic layer having an optical axis in the substrate surface is provided in the liquid crystal cell and is firmly held by the glass substrate. Corner unevenness is less likely to occur compared to pasting conventional retardation films that are subject to dimensional changes due to humidity.

  When the substrate for a liquid crystal display device of the present invention is used for a VA mode or IPS mode liquid crystal display device, it is a single axis having an optical axis in the normal direction of the substrate surface as yet another optical anisotropic layer for viewing angle compensation. It is preferable to have an optically anisotropic layer.

  In the present specification, a positive uniaxial optically anisotropic layer having an optical axis in a plane in which a region having a front retardation of “Re (R), Re (G), and Re (B)” is patterned. "May be referred to as a" patterned positive a-plate optically anisotropic layer ". In this specification, when the above-mentioned “uniaxial optically anisotropic layer having an optical axis in the normal direction of the substrate surface” is formed as a part of the substrate, “c-plate optically anisotropic layer”, or When it is provided as a film such as a protective film in a polarizing plate, it may be referred to as a “c-plate optical anisotropic film”. Moreover, a positive or negative description may be attached to these descriptions. In the present specification, unless otherwise specified, “substrate for liquid crystal display device” and “substrate” are usually used separately.

[Liquid crystal display substrate]
1A to 1D are schematic sectional views showing examples of the substrate 11 for a liquid crystal display device according to the present invention. It should be noted that other layers may be present between the layers shown in the schematic cross-sectional views shown in FIGS. 1 and 2 for adhesion of the layers, orientation of the liquid crystalline compound in the optically anisotropic layer, and the like.
In FIG. 1A, a black matrix 14, a color filter layer 13, and a patterning positive a-plate optically anisotropic layer 15 are formed on a substrate 12 in this order to form a substrate 11 for a liquid crystal display device. . The substrate 12 is not particularly limited as long as it is transparent, but a support having a small birefringence such as glass or a low birefringence polymer is desirable. The color filter layer 13 has at least three regions of 13R, 13G, and 13B, and may have a region of 13W (white). The patterning positive a-plate optically anisotropic layer 15 may be formed so as to have three regions of 15r, 15g, and 15b each having a suitable retardation and film thickness with respect to each of the 13R, 13G, and 13B. it can. As described above, the viewing angle of the liquid crystal display device to which the substrate for the liquid crystal display device is applied is improved by patterning the positive a-plate optically anisotropic layer by selecting a suitable retardation and film thickness according to the color. can do. The chromatic dispersion of the positive a-plate optical anisotropic layer necessary for compensating the viewing angle of the VA mode or IPS mode liquid crystal display device is reverse dispersion, but the material has reverse dispersion so that the viewing angle can be sufficiently improved. Has not been developed yet. Therefore, the effect obtained by patterning the positive a-plate optically anisotropic layer for each color is great.

  1B is a substrate for a liquid crystal display device in which the order of the color filter layer 13 and the patterning positive a-plate optically anisotropic layer 15 is changed with respect to FIG. 1A, and FIG. A substrate for a liquid crystal display device in which a positive or negative c-plate optically anisotropic layer 16 is formed between the substrate 12 and the color filter layer 13 in (a), FIG. 1 (d) is relative to FIG. 1 (c). This is a substrate for a liquid crystal display device in which the order of 13 and 15 is changed. Note that it is preferable to form an alignment layer on the base layer on which the patterning positive a-plate optical anisotropic layer 15 and the c-plate optical anisotropic layer 16 are formed.

[Liquid Crystal Display]
2A to 2A, 2B-1 to 4B, 1C-1 and 2D-1 are schematic cross-sectional views of examples of liquid crystal display devices. 2A-1 shows a liquid crystal display device substrate 11 of FIG. 1A, and a positive or negative c-plate optical anisotropic layer 16 is further formed on the patterning positive a-plate optical anisotropic layer 15. FIG. Using the provided liquid crystal display device substrate and the liquid crystal display device substrate having the TFT 24, the transparent electrode layer 21 and the alignment layer 22 are respectively formed on the liquid crystal layer side of both liquid crystal display device substrates, and then the VA liquid crystal layer 23 is formed. This is a liquid crystal display device using a VA liquid crystal cell 27 with a gap therebetween. On both sides of the liquid crystal cell 27, polarizing plates 28 and 29 composed of a polarizing layer 26 sandwiched between two cellulose acetate films 25 are disposed. 28 is a backlight side and 29 is a display side. By changing the voltage applied between the upper and lower transparent electrode layers 21, the alignment state of the liquid crystal layer changes, so that the liquid crystal display device is switched. An alignment layer is formed on the uppermost surfaces of the upper and lower substrates for the liquid crystal display device in order to determine the alignment of the liquid crystal layer 23. The alignment layer is generally rubbed. Furthermore, by making the cell gap of the liquid crystal layer 23 a multi-gap that changes for each RGB, a liquid crystal cell design with a high degree of freedom can be realized. This method is preferable because an excellent viewing angle characteristic can be achieved particularly in the VA mode or the IPS mode.

  FIG. 2A-2 is an example in which the positive or negative c-plate optically anisotropic layer 16 is provided as a part of an opposing substrate for a liquid crystal display device. 2A-3 and 2A-4 illustrate a liquid crystal display device in which a positive or negative c-plate optical anisotropic film 17 is provided as a protective film for a polarizing plate. In addition, the positive or negative c-plate optically anisotropic film may be provided on the protective film of a polarizing plate. Since the c-plate optically anisotropic film easily changes in size with temperature and humidity and easily causes corner unevenness, the embodiment shown in FIG. 2 (a-1) or FIG. 2 (a-2) is more preferable. Further, examples corresponding to FIGS. 2A-1 to 2A-4 using the liquid crystal display substrate 11 of FIG. 1B are respectively shown in FIGS. 2B-1 to 2B-4. is there. FIGS. 2C-1 and 2D-1 are examples using the liquid crystal display substrate 11 of FIGS. 1C and 1D, respectively.

Hereinafter, the material, the manufacturing method and the like of the substrate for a liquid crystal display device or the liquid crystal display device of the present invention will be described in detail. However, the present invention is not limited to this embodiment, and other embodiments can be carried out with reference to the following description and conventionally known methods, and the present invention is limited to the embodiments described below. It is not something.

[substrate]
The substrate used for manufacturing the substrate for the liquid crystal display device is not particularly limited as long as it is transparent, and a known glass plate such as a soda glass plate having a silicon oxide film on its surface, a low expansion glass, a non-alkali glass, or a quartz glass plate. However, a transparent substrate made of a polymer may be used. In the case of a liquid crystal display device, it is preferable to have heat resistance to withstand a high temperature during driving of the liquid crystal. As such a heat-resistant substrate, a glass plate or polyimide, polyethersulfone, heat-resistant polycarbonate, or polyethylene naphthalate is preferable, and a glass plate is particularly preferable from the viewpoint of price, transparency, and heat resistance. In addition, the substrate can be made to adhere well to the transfer adhesive layer by performing a coupling treatment in advance. As the coupling treatment, a method described in JP 2000-39033 A is preferably used. Although not particularly limited, the film thickness of the substrate is generally preferably 100 to 1200 μm, particularly preferably 300 to 1000 μm.

[Optically anisotropic layer]
The optically anisotropic layer of the present invention is not particularly limited as long as it has at least one incident direction in which Re is not substantially 0 when the phase difference is measured, that is, has optical characteristics that are not isotropic. The optically anisotropic layer, in particular, the patterning a-plate optically anisotropic layer and the c-plate optically anisotropic layer provided as a part of the substrate for a liquid crystal display device are from the viewpoint of easy control of optical characteristics. The liquid crystal layer containing at least one liquid crystalline compound is preferably a layer formed by irradiating with ultraviolet rays. The optical properties of the optically anisotropic layer depend on, for example, the type of liquid crystalline compound, the type or addition amount of the alignment agent to be mixed, the type of alignment film, the rubbing treatment conditions of the alignment film, or the irradiation conditions of ultraviolet rays. It can be adjusted to a preferred range. The thickness of the optically anisotropic layer is preferably 0.1 to 20 μm, and more preferably 0.5 to 10 μm. Hereinafter, the optically anisotropic layer formed from the composition containing a liquid crystalline compound will be described.

[Liquid crystal compounds]
In general, liquid crystal compounds can be classified into a rod-shaped type and a disk-shaped type based on their shapes. In addition, there are low and high molecular types, respectively. Polymer generally refers to a polymer having a degree of polymerization of 100 or more (Polymer Physics / Phase Transition Dynamics, Masao Doi, 2 pages, Iwanami Shoten, 1992).
In the present invention, a rod-like liquid crystalline compound is formed for forming a positive a-plate optically anisotropic layer, a rod-like liquid crystalline compound is formed for forming a positive c-plate optically anisotropic layer, and a negative c-plate optically anisotropic layer is formed. For the formation, it is preferable to use a discotic liquid crystal compound or a mixture of a rod-like liquid crystal compound and a chiral agent. A cholesteric liquid crystal state is obtained by using a chiral agent to form a positive a-plate optical anisotropic layer by horizontally aligning a rod-like liquid crystalline compound and a positive c-plate optical anisotropic layer 16 by vertically aligning a rod-like liquid crystalline compound. Thus, the negative c-plate optically anisotropic layer 16 can be formed.

As the composition containing the liquid crystal compound, a curable liquid crystal composition having advantages such as a temperature change and a change in humidity can be reduced because it is cured into a layer by a polymerization reaction. Therefore, it is desirable that the composition contains a polymerizable component such as a reactive group. Although the liquid crystalline compound itself may be polymerizable or a polymerizable monomer may be added separately, it is preferable that the liquid crystalline compound itself is polymerizable, and the composition contains 2 reactive groups in the molecule. More preferably, at least one liquid crystal compound having at least one is included. The liquid crystalline compound may be a mixture of two or more types, and in that case, at least one preferably has two or more reactive groups. Further, the liquid crystalline compound does not need to be liquid crystalline in the form of the final optically anisotropic layer. For example, in the optically anisotropic layer, the reaction to heat, light, etc. in the composition The liquid crystalline compound having a functional group may be polymerized or cross-linked by reaction with heat, light or the like to have a high molecular weight and lose liquid crystallinity.

Examples of the rod-like liquid crystalline compound having a reactive group include azomethines, azoxys, cyanobiphenyls, cyanophenyl esters, benzoic acid esters, cyclohexanecarboxylic acid phenyl esters, cyanophenylcyclohexanes, cyano-substituted phenylpyrimidines, Alkoxy-substituted phenylpyrimidines, phenyldioxanes, tolanes and alkenylcyclohexylbenzonitriles are preferably used. Furthermore, rod-like liquid crystalline compounds represented by the following general formula (I) are particularly preferably used. In general formula (I), Q ¹ and Q ² each independently represent a reactive group, and L ¹ , L ² , L ³ and L ⁴ each independently represent a single bond or a divalent linking group. , L ³ and L ⁴ are preferably —O—CO—O—. A ¹ and A ² each independently represent a spacer group having 2 to 20 carbon atoms. M represents a mesogenic group.
Formula (I): Q ¹ -L ¹ -A ¹ -L ³ -ML ⁴ -A ² -L ² -Q ²

Hereinafter, the rod-like liquid crystal compound having a reactive group represented by the general formula (I) will be described in more detail. In the formula, Q ¹ and Q ² are each independently a reactive group. The polymerization reaction of the reactive group is preferably addition polymerization (including ring-opening polymerization) or condensation polymerization. In other words, the reactive group is preferably a reactive group capable of addition polymerization reaction or condensation polymerization reaction. Examples of reactive groups are shown below.

Examples of the divalent linking group represented by L ¹ , L ² , L ³ and L ⁴ include —O—, —S—, —CO—, —NR ² —, —CO—O—, and —O—CO. —O—, —CO—NR ² —, —NR ² —CO—, —O—CO—, —O—CO—NR ² —, —NR ² —CO—O—, and NR ² —CO—NR ^2. A divalent linking group selected from the group consisting of-is preferred. R ² is an alkyl group having 1 to 7 carbon atoms or a hydrogen atom. In this case, at least one of L ³ and L ⁴ is —O—CO—O— (carbonate group). In the formula (I), Q ¹ -L ¹ and Q ² -L ² -are CH ₂ ═CH—CO—O—, CH ₂ ═C (CH ₃ ) —CO—O—, and CH ₂ ═C ( Cl) -CO-O-CO- O- are _{preferable, CH 2 = CH-CO-} O- is most preferable.

A ¹ and A ² represent spacer groups having 2 to 20 carbon atoms. An alkylene group having 2 to 12 carbon atoms, an alkenylene group, and an alkynylene group are preferable, and an alkylene group is particularly preferable. The spacer group is preferably a chain and may contain oxygen atoms or sulfur atoms that are not adjacent to each other. The spacer group may have a substituent and may be substituted with a halogen atom (fluorine, chlorine, bromine), a cyano group, a methyl group, or an ethyl group.

  Examples of the mesogenic group represented by M include all known mesogenic groups. In particular, a group represented by the following general formula (II) is preferable.

Formula (II): - (- W 1 -L 5) n -W 2 -
In the formula, W ¹ and W ² each independently represent a divalent cyclic alkylene group or a cyclic alkenylene group, a divalent aryl group or a divalent heterocyclic group, and L ⁵ represents a single bond or a linking group. Specific examples of the linking group include specific examples of groups represented by L ^{1 to} L ⁴ in the formula (I), —CH ₂ —O—, and —O—CH ₂ —. n represents 1, 2 or 3.

W ¹ and W ² include 1,4-cyclohexanediyl, 1,4-phenylene, pyrimidine-2,5-diyl, pyridine-2,5diyl, 1,3,4-thiadiazole-2,5-diyl, 1,3,4-oxadiazole-2,5-diyl, naphthalene-2,6-diyl, naphthalene-1,5-diyl, thiophene-2,5-diyl, pyridazine-3,6-diyl . In the case of 1,4-cyclohexanediyl, there are trans isomers and cis isomers, but either isomer may be used, and a mixture in any proportion may be used. More preferably, it is a trans form. W ¹ and W ² may each have a substituent. Examples of the substituent include a halogen atom (fluorine, chlorine, bromine, iodine), a cyano group, an alkyl group having 1 to 10 carbon atoms (methyl group, ethyl group, propyl group, etc.), and an alkoxy group having 1 to 10 carbon atoms. (Methoxy group, ethoxy group, etc.), C1-10 acyl group (formyl group, acetyl group, etc.), C1-10 alkoxycarbonyl group (methoxycarbonyl group, ethoxycarbonyl group, etc.), carbon atom Examples thereof include an acyloxy group having 1 to 10 (acetyloxy group, propionyloxy group, etc.), nitro group, trifluoromethyl group, difluoromethyl group and the like.

  Preferred examples of the basic skeleton of the mesogenic group represented by the general formula (II) are shown below. These may be substituted with the above substituents.

  Examples of the compound represented by the general formula (I) are shown below, but the present invention is not limited thereto. The compound represented by the general formula (I) can be synthesized by the method described in JP-T-11-513019.

Examples of discotic liquid crystal compounds include C.I. Destrade et al., Mol. Cryst. 71, 111 (1981), benzene derivatives described in C.I. Destrade et al., Mol. Cryst. 122, 141 (1985), Physicslett, A, 78, 82 (1990); Kohne et al., Angew. Chem. 96, 70 (1984) and the cyclohexane derivatives described in J. Am. M.M. Lehn et al. Chem. Commun. , 1794 (1985), J. Am. Zhang et al., J. Am. Chem. Soc. 116, page 2655 (1994), and azacrown-based and phenylacetylene-based macrocycles. The above discotic compounds generally have a structure in which these are used as a disc-shaped mother nucleus at the center of a molecule, and a group (L) such as a linear alkyl group, an alkoxy group, or a substituted benzoyloxy group is radially substituted. , Showing liquid crystallinity. However, when such an aggregate of molecules is uniformly oriented, it exhibits negative uniaxiality, but is not limited to this description.

In the present invention, it is preferable to use a discotic liquid crystalline compound represented by the following general formula (III).
Formula (III): D (-LP) _n
In the formula, D is a discotic core, L is a divalent linking group, P is a polymerizable group, and n is an integer of 4 to 12.

  In the formula (III), preferred specific examples of the discotic core (D), the divalent linking group (L) and the polymerizable group (P) are (D1) described in JP-A No. 2001-4837, respectively. To (D15), (L1) to (L25), (P1) to (P18), and the discotic core (D), divalent linking group (L) and polymerizable group ( The contents regarding P) can be preferably applied here.

  Preferred examples of the discotic compound are shown below.

[Method for Fabricating Patterned Positive a-Plate Optical Anisotropic Layer]
When forming a positive a-plate optically anisotropic layer from a composition containing a liquid crystal compound, the liquid crystal compound is usually formed on a substrate (another layer may be formed on the substrate) or the like. An optically anisotropic layer can be obtained by applying the composition containing the composition, aging and orienting it at the liquid crystal phase forming temperature, and then irradiating it with heat or ionizing radiation.
The method for producing the patterning positive a-plate optically anisotropic layer is not particularly limited, and examples thereof include the following methods (i) to (iv).
(I) A method of forming an optically anisotropic layer for each color by photolithography. For example, Bianc
a M.M. I. van der Zande, et al. , Adv. Funct. Mater. 2006, 16, 791-798 and the like can be used.
(Ii) A method of solid-applying an optically anisotropic layer on a substrate having a level difference in advance using a color filter or the like. For example, a method described in JP-A-2005-24919 can be referred to. This is desirable because the patterned optically anisotropic layer can be easily produced in one step.
(Iii) A method of forming each color filter by a transfer method and simultaneously forming an optically anisotropic layer using a transfer material in which an optically anisotropic layer and a colored photosensitive resin layer are sequentially formed on a temporary support. For example, a method described in JP-A-2007-72253 can be referred to. While producing a color filter, an optically anisotropic layer can also be formed without increasing the number of steps.
(Iv) A method of forming an optically anisotropic layer using a printing method or an inkjet method. For example, the method described in JP-A-2006-64858 can be referred to. Since the load in forming the optically anisotropic layer is the smallest, the cost advantage is great.
Of the above methods (i) to (iv), (iii) or (iv) is preferable, and (iii) is more preferable.

When forming a positive a-plate optical anisotropic layer and a positive c-plate optical anisotropic layer from a composition containing a rod-like liquid crystalline compound, or negative c-plate optical anisotropy from a composition containing a discotic liquid crystalline compound In the case of forming the luminescent layer, the molecules of the liquid crystalline compound can be substantially horizontally aligned by containing at least one of the compounds represented by the following general formulas (1) to (3). In the present specification, “horizontal alignment” means that in the case of a rod-like liquid crystal, the molecular long axis and the horizontal plane of the transparent support are parallel, and in the case of a disc-like liquid crystal, the circle of the core of the disc-like liquid crystal compound. The horizontal plane of the board and the transparent support is said to be parallel, but it is not required to be strictly parallel. In the present specification, an orientation with an inclination angle of less than 10 degrees with the horizontal plane is meant. And The inclination angle is preferably 0 to 5 degrees, more preferably 0 to 3 degrees, further preferably 0 to 2 degrees, and most preferably 0 to 1 degree.
Hereinafter, the following general formulas (1) to (3) will be described in order.

In the formula, R ¹ , R ² and R ³ each independently represent a hydrogen atom or a substituent, and X ¹ , X ² and X ^{3 each} represent a single bond or a divalent linking group. The substituent represented by each of R ^{1 to} R ³ is preferably a substituted or unsubstituted alkyl group (more preferably an unsubstituted alkyl group or a fluorine-substituted alkyl group), an aryl group (particularly a fluorine-substituted alkyl). An aryl group having a group is preferred), a substituted or unsubstituted amino group, an alkoxy group, an alkylthio group, and a halogen atom. The divalent linking groups represented by X ¹ , X ² and X ³ are each an alkylene group, an alkenylene group, a divalent aromatic group, a divalent heterocyclic residue, —CO—, —NR ^a — ( R ^a is ^a divalent linking group selected from the group consisting of an alkyl group having 1 to 5 carbon atoms or a hydrogen atom), —O—, —S—, —SO—, —SO ₂ —, and combinations thereof. Preferably there is. The divalent linking group is selected from the group consisting of an alkylene group, a phenylene group, —CO—, —NR ^a —, —O—, —S—, and —SO ₂ —. It is more preferable that the divalent linking group is a combination of at least two groups. The alkylene group preferably has 1 to 12 carbon atoms. The alkenylene group preferably has 2 to 12 carbon atoms. The number of carbon atoms of the divalent aromatic group is preferably 6-10.

In the formula, R represents a substituent, and m represents an integer of 0 to 5. When m represents an integer greater than or equal to 2, several R may be same or different. Preferred substituents for R are the same as those recited as preferred ranges for the substituents represented by R ¹ , R ² , and R ³ . m preferably represents an integer of 1 to 3, particularly preferably 2 or 3.

In the formula, R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ and R ⁹ each independently represent a hydrogen atom or a substituent. The substituents represented by R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ and R ⁹ are each preferably a substituent represented by R ¹ , R ² and R ³ in the general formula (I). It is listed as a thing. As the horizontal alignment agent used in the present invention, the compounds described in paragraphs [0092] to [0096] of JP-A-2005-99248 can be used, and the synthesis method of these compounds is also described in the specification. ing.

The amount of the compound represented by the general formulas (1) to (3) is preferably 0.01 to 20% by mass, more preferably 0.01 to 10% by mass based on the mass of the liquid crystal compound. 02-1 mass% is especially preferable. In addition, the compounds represented by the general formulas (1) to (3) may be used alone or in combination of two or more.

The optically anisotropic layer is preferably formed by applying a coating liquid containing a liquid crystalline compound and the following polymerization initiator and other additives onto a predetermined alignment layer described later. As a solvent used for preparing the coating solution, an organic solvent is preferably used. Examples of organic solvents include amides (eg, N, N-dimethylformamide), sulfoxides (eg, dimethyl sulfoxide), heterocyclic compounds (eg, pyridine), hydrocarbons (eg, benzene, hexane), alkyl halides (eg, , Chloroform, dichloromethane), esters (eg, methyl acetate, butyl acetate), ketones (eg, acetone, methyl ethyl ketone), ethers (eg, tetrahydrofuran, 1,2-dimethoxyethane). Alkyl halides and ketones are preferred. Two or more organic solvents may be used in combination.

  The optically anisotropic layer is formed by applying a composition containing a liquid crystal compound (for example, a coating solution) to the surface of an alignment layer described later to obtain an alignment state exhibiting a desired liquid crystal phase, and then heating the alignment state. Or it is preferable that it is the layer produced by fixing by irradiation of ionizing radiation. The immobilization is preferably carried out by a polymerization reaction of a reactive group introduced into the liquid crystal compound. The polymerization reaction includes a thermal polymerization reaction using a thermal polymerization initiator and a photopolymerization reaction using a photopolymerization initiator, and a photopolymerization reaction is more preferable. Examples of the photopolymerization initiator include α-carbonyl compounds (described in US Pat. Nos. 2,367,661 and 2,367,670), acyloin ether (described in US Pat. No. 2,448,828), α-hydrocarbon substituted aromatic acyloin. Compound (described in US Pat. No. 2,722,512), polynuclear quinone compound (described in US Pat. Nos. 3,046,127 and 2,951,758), a combination of triarylimidazole dimer and p-aminophenyl ketone (US Pat. No. 3,549,367) Acridine and phenazine compounds (JP-A-60-105667, U.S. Pat. No. 4,239,850) and oxadiazole compounds (U.S. Pat. No. 4,212,970).

It is preferable that the usage-amount of a photoinitiator is 0.01-20 mass% of solid content of a coating liquid, and it is further more preferable that it is 0.5-5 mass%. Light irradiation for the polymerization of the liquid crystalline compound is preferably performed using ultraviolet rays. The irradiation energy is preferably ^{20mJ / cm 2 ~10J / cm 2} , further preferably 100 to 800 mJ / cm ^2. In order to accelerate the photopolymerization reaction, light irradiation may be performed under a nitrogen atmosphere or under heating conditions.

[Alignment layer]
As described above, an alignment layer may be used to form the optically anisotropic layer. The alignment layer functions so as to define the alignment direction of the liquid crystal compound provided thereon. The orientation layer may be any layer as long as it can impart orientation to the optically anisotropic layer. Preferable examples of the alignment layer include a layer subjected to a rubbing treatment of an organic compound (preferably a polymer), an oblique deposition layer of an inorganic compound, and a layer having a microgroove, ω-tricosanoic acid, dioctadecylmethylammonium chloride and stearyl. Examples thereof include a cumulative film formed by Langmuir-Blodgett method (LB film) such as methyl acid, or a layer in which a dielectric is oriented by applying an electric field or a magnetic field.

Examples of organic compounds for the alignment layer include polymethyl methacrylate, acrylic acid / methacrylic acid copolymer, styrene / maleimide copolymer, polyvinyl alcohol, poly (N-methylolacrylamide), styrene / vinyltoluene copolymer. , Polymers such as chlorosulfonated polyethylene, nitrocellulose, polyvinyl chloride, chlorinated polyolefin, polyester, polyimide, vinyl acetate / vinyl chloride copolymer, ethylene / vinyl acetate copolymer, carboxymethyl cellulose, polyethylene, polypropylene and polycarbonate, and Examples of the compound include a silane coupling agent. Examples of preferred polymers include polyimide, polystyrene, polymers of styrene derivatives, gelatin, polyvinyl alcohol, and alkyl-modified polyvinyl alcohol having an alkyl group (preferably having 6 or more carbon atoms).

A polymer is preferably used for forming the alignment layer. The type of polymer that can be used can be determined according to the orientation (particularly the average tilt angle) of the liquid crystal compound. For example, in order to align the liquid crystalline compound horizontally, a polymer that does not decrease the surface energy of the alignment layer (ordinary alignment polymer) is used. Specific types of polymers are described in various documents about liquid crystal cells or optical compensation sheets. For example, polyvinyl alcohol or modified polyvinyl alcohol, a copolymer with polyacrylic acid or polyacrylate, polyvinyl pyrrolidone, cellulose, or modified cellulose are preferably used. The alignment layer material may have a functional group capable of reacting with the reactive group of the liquid crystal compound. The reactive group can be introduced by introducing a repeating unit having a reactive group in the side chain or as a substituent of a cyclic group. It is more preferable to use an alignment layer that forms a chemical bond with the liquid crystal compound at the interface. Such an alignment layer is described in JP-A-9-152509, and acid chloride or Karenz MOI (manufactured by Showa Denko KK). The modified polyvinyl alcohol in which an acrylic group is introduced into the side chain by using The thickness of the alignment layer is preferably 0.01 to 5 μm, and more preferably 0.05 to 2 μm. The alignment layer may have a function as an oxygen blocking film.

A polyimide film (preferably fluorine atom-containing polyimide) widely used as an alignment layer for LCD is also preferable as the organic alignment layer. This is a polyamic acid (for example, LQ / LX series manufactured by Hitachi Chemical Co., Ltd., SE series manufactured by Nissan Chemical Co., Ltd., etc.) is applied to the support surface and baked at 100 to 300 ° C. for 0.5 to 1 hour. And then obtained by rubbing.

Moreover, the rubbing process can utilize a processing method widely adopted as a liquid crystal alignment process of LCD. That is, a method of obtaining the orientation by rubbing the surface of the orientation layer in a certain direction using paper, gauze, felt, rubber, nylon, polyester fiber or the like can be used. In general, it is carried out by rubbing several times using a cloth in which fibers having a uniform length and thickness are flocked on average.

Moreover, as a vapor deposition material for the inorganic oblique vapor deposition film, SiO ₂ is representative, metal oxides such as TiO ₂ and ZnO ₂ , fluorides such as MgF ₂ , and metals such as Au and Al. . The metal oxide can be used as an oblique deposition material as long as it has a high dielectric constant, and is not limited to the above. The inorganic oblique deposition film can be formed using a deposition apparatus.

The optically anisotropic layer can be transferred by aligning the liquid crystalline compound on the temporary alignment layer, fixing the alignment, and then using an adhesive on the transparent support, but from the viewpoint of productivity. Is preferably formed directly without transfer.

[A uniaxial optically anisotropic layer having an optical axis in the normal direction of the substrate surface]
When forming a c-plate optically anisotropic layer from a composition containing a liquid crystalline compound, the c-plate optically anisotropic layer comprises a composition containing a liquid crystalline compound (preferably the discotic liquid crystal composition). Coating on a substrate (other layers such as the above-mentioned alignment layer may be formed on the substrate), aging and orientation at the liquid crystal phase formation temperature, and then irradiating with heat or ionizing radiation in that state Can be obtained.

When a c-plate optically anisotropic film is formed from a composition containing a liquid crystal compound, the c-plate optically anisotropic film is composed of a support (including a discotic liquid crystal composition and a polymer film). Other layers such as an alignment layer may be formed) and may be formed by coating. For example, when a discotic liquid crystalline compound having a polymerizable group is used, it is fixed in a homeotropic alignment state in which the angle formed by the optical axis of the disc surface of the discotic molecule and the layer surface is orthogonal by ultraviolet rays or heating. And optical anisotropy can be developed. Here, even if the birefringence of the polymer film as a support is positively utilized to satisfy the optical properties required for a c-plate optically anisotropic film as a laminate, The film has a retardation of almost zero (for example, a cellulose acylate film described in JP-A-2005-138375), and the required optical properties are obtained only with the layer made of the curable liquid crystal composition. It may be a satisfactory mode.

  The c-plate optically anisotropic film may be a general polymer film. When the c-plate optically anisotropic film is a general polymer film, it can be bonded to a polarizer. Further, the c-plate optical anisotropic film, which is a polymer film, can be incorporated into a liquid crystal display device as an independent member, for example, as an optical compensation film.

  As a material of the polymer film, any material may be used as long as the above conditions are satisfied, and a polymer excellent in optical performance, transparency, mechanical strength, thermal stability, and moisture shielding properties is preferable. Examples include polycarbonate polymers, polyester polymers such as polyethylene terephthalate and polyethylene naphthalate, acrylic polymers such as polymethyl methacrylate, and styrene polymers such as polystyrene and acrylonitrile / styrene copolymer (AS resin). Polyolefins such as polyethylene and polypropylene, polyolefin polymers such as ethylene / propylene copolymers, vinyl chloride polymers, amide polymers such as nylon and aromatic polyamide, imide polymers, sulfone polymers, polyethersulfone polymers , Polyether ether ketone polymers, polyphenylene sulfide polymers, vinylidene chloride polymers, vinyl alcohol polymers, vinyl butyral polymers, arylate polymers, polyoxymethylene polymers, epoxy polymers, or polymers mixed with the above polymers Take as an example.

  As a material for forming the polymer film, a thermoplastic norbornene resin can be preferably used. Examples of the thermoplastic norbornene-based resin include ZEONEX, ZEONOR manufactured by Nippon Zeon Co., Ltd., and ARTON manufactured by JSR Corporation.

  In addition, as a material for forming the polymer film, a cellulose polymer (hereinafter referred to as cellulose acylate) that has been conventionally used as a transparent protective film of a polarizing plate can be particularly preferably used. A representative example of cellulose acylate is triacetyl cellulose. Examples of cellulose as a cellulose acylate raw material include cotton linter and wood pulp (hardwood pulp, softwood pulp). Cellulose acylate obtained from any raw material cellulose can be used, and in some cases, a mixture may be used. Detailed descriptions of these raw material celluloses can be found in, for example, Marusawa and Uda, “Plastic Materials Course (17) Fibrous Resin”, published by Nikkan Kogyo Shimbun (published in 1970), and the Japan Society of Invention and Innovation Technical Bulletin No. 2001. The cellulose described in No. -1745 (pages 7 to 8) can be used, and the cellulose acylate film is not particularly limited.

Further, the material forming the polymer film preferably contains an Rth enhancer. The “Rth enhancer” is a compound having the property of developing birefringence in the thickness direction of the film. As the Rth enhancer, a compound having a large polarizability anisotropy having an absorption maximum in a wavelength range of 250 nm to 380 nm is preferable. The content of the Rth enhancer with respect to 100 parts by mass of cellulose acylate is preferably 0.1 to 30% by mass, more preferably 1 to 25% by mass, and still more preferably 3 to 15% by mass. In addition, when manufacturing the said cellulose acylate film by a solvent cast method, you may add the said Rth expression agent in dope. The timing of adding the Rth enhancer is not particularly limited, and the Rth enhancer is dissolved in an organic solvent such as alcohol, methylene chloride, dioxolane, etc., and then added to the cellulose acylate solution (dope) or directly in the dope composition. It may be added inside.
As the Rth enhancer, a compound represented by the following general formula (I) can be particularly preferably used.

In the formula, X ²¹ is a single bond, —NR ²⁴ —, —O— or S—; X ²² is a single bond, —NR ²⁵ —, —O— or S—; X ²³ is a single bond A bond, —NR ²⁶ —, —O— or S—. R ²¹ , R ²² and R ²³ are each independently an alkyl group, an alkenyl group, an aromatic ring group or a heterocyclic group; R ²⁴ , R ²⁵ and R ²⁶ are each independently a hydrogen atom. , An alkyl group, an alkenyl group, an aryl group or a heterocyclic group.

Preferred examples (I- (1) to IV- (10)) of the compounds represented by the general formula (I) are shown below, but the present invention is not limited to these specific examples.

As the Rth enhancer, a compound represented by the following general formula (III) is also preferable. Hereinafter, the compound of the general formula (III) will be described in detail.

In the general formula (III), R ¹² , R ¹⁴ and R ¹⁵ each independently represent a hydrogen atom or a substituent, R ¹¹ and R ¹³ each independently represent a hydrogen atom or an alkyl group, and L ¹ and L ² are Each independently represents a single bond or a divalent linking group. Ar ¹ represents an arylene group or an aromatic heterocyclic ring, Ar ² represents an aryl group or an aromatic heterocyclic ring, n represents an integer of 3 or more, and n ² types of L ² and Ar ¹ are the same. It may or may not be. However, R ¹¹ and R ¹³ are different from each other, and the alkyl group represented by R ¹³ does not contain a hetero atom.

In general formula (III), R < ¹² >, R <^14> , R < ¹⁵ > represents a hydrogen atom or a substituent each independently. Substituent T described later can be applied as the substituent.

R ¹² in the general formula (III) is preferably a hydrogen atom, an alkyl group, an alkoxy group, an amino group or a hydroxyl group, more preferably a hydrogen atom, an alkyl group or an alkoxy group, still more preferably a hydrogen atom or an alkyl group. Group (preferably 1 to 4 carbon atoms, more preferably a methyl group), an alkoxy group (preferably 1 to 12 carbon atoms, more preferably 1 to 8 carbon atoms, still more preferably 1 to 6 carbon atoms, particularly Preferably it is C1-C4. Particularly preferred are a hydrogen atom, a methyl group and a methoxy group, and most preferred is a hydrogen atom.

R ¹⁴ in the general formula (III) is preferably a hydrogen atom or an electron donating group, more preferably a hydrogen atom, an alkyl group, an alkoxy group, an amino group, or a hydroxyl group, still more preferably a hydrogen atom or a carbon number. An alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 12 carbon atoms (preferably having 1 to 12 carbon atoms, more preferably 1 to 8 carbon atoms, still more preferably 1 to 6 carbon atoms, and particularly preferably 1 to 4 carbon atoms). And particularly preferably a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and most preferably a hydrogen atom or a methoxy group.

R ¹⁵ in the general formula (III) is preferably a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an amino group or a hydroxyl group, more preferably a hydrogen atom, an alkyl group or an alkoxy group, still more preferably a hydrogen atom. An atom, an alkyl group (preferably having 1 to 4 carbon atoms, more preferably a methyl group), an alkoxy group (preferably having 1 to 12 carbon atoms, more preferably 1 to 8 carbon atoms, and further preferably 1 to 6 carbon atoms). Particularly preferably, it has 1 to 4 carbon atoms. Particularly preferred are a hydrogen atom, a methyl group and a methoxy group. Most preferably, it is a hydrogen atom.

R ¹¹ and R ¹³ in the general formula (III) each independently represent a hydrogen atom or an alkyl group, R ¹¹ and R ¹³ are different from each other, and the alkyl group represented by R ¹³ does not contain a hetero atom. Here, the hetero atom means an atom other than a hydrogen atom or a carbon atom, and examples thereof include an oxygen atom, a nitrogen atom, a sulfur atom, phosphorus, silicon, a halogen atom (F, Cl, Br, I), and boron. The alkyl group represented by R ¹¹ and R ¹³ is linear, branched or cyclic and represents a substituted or unsubstituted alkyl group, preferably a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms. A substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted bicycloalkyl group having 5 to 30 carbon atoms (that is, a monovalent structure in which one hydrogen atom is removed from a bicycloalkane having 5 to 30 carbon atoms) And a tricyclo structure having more ring structures.

Preferable examples of the alkyl group represented by R ¹¹ and R ¹³ include methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, t-butyl, n-pentyl group, iso-pentyl group, n -Hexyl group, n-heptyl group, n-octyl group, tert-octyl group, 2-ethylhexyl group, n-nonyl group, 1,1,3-trimethylhexyl group, n-decyl group, 2-hexyldecyl group, Examples thereof include a cyclohexyl group, a cycloheptyl group, a 2-hexenyl group, an oleyl group, a linoleyl group, and a linolenyl group. Examples of the cycloalkyl group include cyclohexyl, cyclopentyl, 4-n-dodecylcyclohexyl, and examples of the bicycloalkyl group include bicyclo [1,2,2] heptan-2-yl and bicyclo [2,2,2] octane-3. -Yl and the like.

R ¹¹ is more preferably a hydrogen atom, methyl group, ethyl group, n-propyl group, or isopropyl group, particularly preferably a hydrogen atom or methyl group, and most preferably a methyl group. R ¹³ is particularly preferably an alkyl group containing 2 or more carbon atoms, more preferably an alkyl group containing 3 or more carbon atoms. Those having a branched or cyclic structure are particularly preferably used.

Hereinafter, specific examples (O-1 to O-20) of the alkyl group represented by R ¹³ will be described. However, the present invention is not limited to the following specific examples. In the specific examples below, “#” means the oxygen atom side.

Ar ¹ in the general formula (III) represents an arylene group or an aromatic heterocyclic ring, and all Ar ¹ in the repeating unit may be the same or different. Ar ² represents an aryl group or an aromatic heterocyclic ring. In the general formula (III), the arylene group represented by Ar ¹ is preferably an arylene group having 6 to 30 carbon atoms, which may be a single ring or may form a condensed ring with another ring. Good. Further, if possible, it may have a substituent, and the substituent T described later can be applied as the substituent. More preferably, the arylene group represented by Ar ¹ has 6 to 20 carbon atoms, particularly preferably 6 to 12 carbon atoms, and examples thereof include a phenylene group, a p-methylphenylene group, and a naphthylene group. In general formula (III), the aryl group represented by Ar ² is preferably an aryl group having 6 to 30 carbon atoms, which may be monocyclic or may form a condensed ring with another ring. Good. Further, if possible, it may have a substituent, and the substituent T described later can be applied as the substituent. The aryl group represented by Ar ² has more preferably 6 to 20 carbon atoms, particularly preferably 6 to 12 carbon atoms, and examples thereof include a phenyl group, a p-methylphenyl group, and a naphthyl group.

In the general formula (III), the aromatic heterocycle represented by Ar ¹ or Ar ² may be an aromatic heterocycle containing at least one of an oxygen atom, a nitrogen atom or a sulfur atom, preferably 5 It is an aromatic heterocycle containing at least one of a 6-membered oxygen atom, nitrogen atom or sulfur atom. Moreover, you may have a substituent further if possible. Substituent T described later can be applied as the substituent.

In the general formula (III), specific examples of the aromatic heterocycle represented by Ar ¹ and Ar ² include, for example, furan, pyrrole, thiophene, imidazole, pyrazole, pyridine, pyrazine, pyridazine, triazole, triazine, indole, Indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole, oxadiazole, quinoline, isoquinoline, phthalazine, naphthyridine, quinoxaline, quinazoline, cinnoline, pteridine, acridine, phenanthroline, phenazine, tetrazole, benzimidazole, benzoxazole, benzthiazole , Benzotriazole, tetrazaindene, pyrrolotriazole, pyrazolotriazole and the like. Preferred as the aromatic heterocycle are benzimidazole, benzoxazole, benzthiazole, and benzotriazole.

In general formula (III), L ¹ and L ² each independently represents a single bond or a divalent linking group. L ¹ and L ² may be the same or different. Further, all L ² in the repeating unit may be the same or different.

Preferred as the divalent linking group are —O—, —NR— (R represents a hydrogen atom or an alkyl group or an aryl group which may have a substituent), —CO—, —SO ₂ —, -S-, an alkylene group, a substituted alkylene group, an alkenylene group, a substituted alkenylene group, an alkynylene group, and a group obtained by combining two or more of these divalent groups, more preferably -O-,- NR -, - CO -, - SO 2 NR -, - NRSO 2 -, - CONR -, - NRCO -, - COO-, and OCO-, an alkynylene group. R preferably represents a hydrogen atom.

In the compound represented by the general formula (III) in the present invention, Ar ¹ is bonded to L ¹ and L ^{2. When} Ar ¹ is a phenylene group, L ^1- Ar ¹ -L ² and L ^2- Ar ¹ -L ² is particularly preferably in a para-position (1,4-position) to each other.

In general formula (III), n represents an integer greater than or equal to 3, Preferably it is 3-7, More preferably, it is 3-6, More preferably, it is 3-5.

As the compound represented by the general formula (III), compounds represented by the following general formulas (IV) and (V) can be particularly preferably used.

In the general formula (IV), R ¹² and R ¹⁵ each independently represent a hydrogen atom or a substituent, R ¹¹ and R ¹³ each independently represent a hydrogen atom or an alkyl group, and L ¹ , L ² Each independently represents a single bond or a divalent linking group. Ar ¹ represents an arylene group or an aromatic heterocyclic ring, Ar ² represents an aryl group or an aromatic heterocyclic ring, n represents an integer of 3 or more, and n ² types of L ² and Ar ¹ are the same. It may or may not be. However, R ¹¹ and R ¹³ are different from each other, and the alkyl group represented by R ¹³ does not contain a hetero atom.

In general formula (IV), R < ¹² >, R <^15> , R < ^{11 >} , R < ¹³ > is synonymous with those in general formula (III), and preferred ranges are also the same. L ¹ , L ² , Ar ¹ and Ar ² are also synonymous with those in the general formula (III), and preferred ranges are also the same.

In the general formula (V), R ¹² and R ¹⁵ each independently represent a hydrogen atom or a substituent, R ¹¹ , R ¹³ and R ¹⁴ each independently represent a hydrogen atom or an alkyl group, and L ¹ and L ² are Each independently represents a single bond or a divalent linking group. Ar ¹ represents an arylene group or an aromatic heterocyclic ring, Ar ² represents an aryl group or an aromatic heterocyclic ring, n represents an integer of 3 or more, and n ² types of L ² and Ar ¹ are the same. It may or may not be. However, R ¹¹ and R ¹³ are different from each other, and the alkyl group represented by R ¹³ does not contain a hetero atom.

In general formula (V), R < ¹² >, R <^15> , R < ^{11 >} , R < ¹³ > are synonymous with those in general formula (III), and preferred ranges are also the same. L ¹ , L ² , Ar ¹ and Ar ² have the same meanings as those in formula (III), and preferred ranges are also the same.

In the general formula (V), R ¹⁴ represents a hydrogen atom or an alkyl group, and as the alkyl group, alkyl groups shown as preferred examples of R ¹¹ and R ¹³ are preferably used. R ¹⁴ is preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and further preferably a methyl group. R ¹¹ and R ¹⁴ may be the same or different, but both are particularly preferably methyl groups.

  Moreover, as a compound represented by the said general formula (V), the compound represented by general formula (VA) or general formula (VB) is also preferable.

In the general formula (VA), R ¹² and R ¹⁵ each independently represent a hydrogen atom or a substituent, R ¹¹ and R ¹³ each independently represent a hydrogen atom or an alkyl group, L ¹ , L ² each independently represents a single bond or a divalent linking group. Ar ¹ represents an arylene group or an aromatic heterocyclic ring, n represents an integer of 3 or more, and n ² types of L ² and Ar ² may be the same or different. However, R ¹¹ and R ¹³ are different from each other, and the alkyl group represented by R ¹³ does not contain a hetero atom.

In general formula (VA), R ¹² , R ¹⁵ , R ¹¹ , R ¹³ , L ¹ , L ² , Ar ¹ , and n have the same meanings as those in general formula (III), and preferred ranges are also the same. is there.

In general formula (V-B), R ¹² and R ¹⁵ each independently represent a hydrogen atom or a substituent, and R ¹¹ , R ¹³ and R ¹⁴ each independently represent a hydrogen atom or an alkyl group, L ¹ and L ² each independently represents a single bond or a divalent linking group. Ar ¹ represents an arylene group or an aromatic heterocyclic ring, n represents an integer of 3 or more, and n types of L ¹ and Ar ² may be the same or different. However, R ¹¹ and R ¹³ are different from each other, and the alkyl group represented by R ¹³ does not contain a hetero atom.

In general formula (V-B), R ¹² , R ¹⁵ , R ¹¹ , R ¹³ , R ¹⁴ , L ¹ , L ² , Ar ¹ , and n are as defined in general formulas (III) and (V). The preferred range is also the same.

The aforementioned substituent T will be described below. The substituent T is preferably a halogen atom (for example, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom), an alkyl group (preferably an alkyl group having 1 to 30 carbon atoms, such as a methyl group, an ethyl group, an n-propyl group, Isopropyl group, t-butyl group, n-octyl group, 2-ethylhexyl group), cycloalkyl group (preferably a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, such as cyclohexyl group, cyclopentyl group, 4 -N-dodecylcyclohexyl group), a bicycloalkyl group (preferably a mono- or di-substituted bicycloalkyl group having 5 to 30 carbon atoms, that is, a monovalent group in which one hydrogen atom is removed from a bicycloalkane having 5 to 30 carbon atoms. For example, bicyclo [1,2,2] heptan-2-yl, bicyclo [2,2,2] octane-3 Yl), an alkenyl group (preferably a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, such as a vinyl group or an allyl group), a cycloalkenyl group (preferably a substituted or unsubstituted cyclohexane having 3 to 30 carbon atoms). An alkenyl group, that is, a monovalent group obtained by removing one hydrogen atom of a cycloalkene having 3 to 30 carbon atoms, such as 2-cyclopenten-1-yl and 2-cyclohexen-1-yl), a bicycloalkenyl group ( A substituted or unsubstituted bicycloalkenyl group, preferably a substituted or unsubstituted bicycloalkenyl group having 5 to 30 carbon atoms, that is, a monovalent group in which one hydrogen atom of a bicycloalkene having one double bond is removed. For example, bicyclo [2,2,1] hept-2-en-1-yl, bicyclo [2,2,2] oct-2-en-4-yl), al An aryl group (preferably a substituted or unsubstituted alkynyl group having 2 to 30 carbon atoms, such as ethynyl group, propargyl group), an aryl group (preferably a substituted or unsubstituted aryl group having 6 to 30 carbon atoms such as phenyl Group, p-tolyl group, naphthyl group), heterocyclic group (preferably a monovalent group obtained by removing one hydrogen atom from a 5- or 6-membered substituted or unsubstituted aromatic or non-aromatic heterocyclic compound And more preferably a 5- or 6-membered aromatic heterocyclic group having 3 to 30 carbon atoms (for example, 2-furyl group, 2-thienyl group, 2-pyrimidinyl group, 2-benzothiazolyl group),

A cyano group, a hydroxyl group, a nitro group, a carboxyl group, an alkoxy group (preferably a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, such as a methoxy group, an ethoxy group, an isopropoxy group, a t-butoxy group, n -Octyloxy group, 2-methoxyethoxy group), aryloxy group (preferably a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, for example, phenoxy group, 2-methylphenoxy group, 4-tert-butyl) Phenoxy group, 3-nitrophenoxy group, 2-tetradecanoylaminophenoxy group), silyloxy group (preferably a silyloxy group having 3 to 20 carbon atoms, for example, trimethylsilyloxy group, tert-butyldimethylsilyloxy group), hetero A ring oxy group (preferably a substituted or unsubstituted hete Ring oxy group, 1-phenyltetrazole-5-oxy group, 2-tetrahydropyranyloxy group), acyloxy group (preferably formyloxy group, substituted or unsubstituted alkylcarbonyloxy group having 2 to 30 carbon atoms, carbon number 6-30 substituted or unsubstituted arylcarbonyloxy groups such as formyloxy group, acetyloxy group, pivaloyloxy group, stearoyloxy group, benzoyloxy group, p-methoxyphenylcarbonyloxy group), carbamoyloxy group (preferably A substituted or unsubstituted carbamoyloxy group having 1 to 30 carbon atoms, such as N, N-dimethylcarbamoyloxy group, N, N-diethylcarbamoyloxy group, morpholinocarbonyloxy group, N, N-di-n-octyl Aminocarbonyloxy group, Nn-oct Rucarbamoyloxy group), alkoxycarbonyloxy group (preferably a substituted or unsubstituted alkoxycarbonyloxy group having 2 to 30 carbon atoms, such as methoxycarbonyloxy group, ethoxycarbonyloxy group, tert-butoxycarbonyloxy group, n-octylcarbonyl group) Oxy group), aryloxycarbonyloxy group (preferably a substituted or unsubstituted aryloxycarbonyloxy group having 7 to 30 carbon atoms, for example, phenoxycarbonyloxy group, p-methoxyphenoxycarbonyloxy group, pn-hexa Decyloxyphenoxycarbonyloxy group),

An amino group (preferably an amino group, a substituted or unsubstituted alkylamino group having 1 to 30 carbon atoms, a substituted or unsubstituted anilino group having 6 to 30 carbon atoms, such as an amino group, a methylamino group, a dimethylamino group; , Anilino group, N-methyl-anilino group, diphenylamino group), acylamino group (preferably formylamino group, substituted or unsubstituted alkylcarbonylamino group having 1 to 30 carbon atoms, substituted or unsubstituted 6 to 30 carbon atoms, or Unsubstituted arylcarbonylamino group, for example, formylamino group, acetylamino group, pivaloylamino group, lauroylamino group, benzoylamino group), aminocarbonylamino group (preferably substituted or unsubstituted amino having 1 to 30 carbon atoms) Carbonylamino group, for example, carbamoylamino group, N, N-dimethylaminocarbonyl Mino group, N, N-diethylaminocarbonylamino group, morpholinocarbonylamino group), alkoxycarbonylamino group (preferably a substituted or unsubstituted alkoxycarbonylamino group having 2 to 30 carbon atoms, such as methoxycarbonylamino group, ethoxycarbonylamino Group, tert-butoxycarbonylamino group, n-octadecyloxycarbonylamino group, N-methyl-methoxycarbonylamino group), aryloxycarbonylamino group (preferably substituted or unsubstituted aryloxycarbonyl having 7 to 30 carbon atoms) An amino group such as a phenoxycarbonylamino group, a p-chlorophenoxycarbonylamino group, an mn-octyloxyphenoxycarbonylamino group, a sulfamoylamino group (preferably having 0 to 30 carbon atoms); Substituted or unsubstituted sulfamoylamino groups, such as sulfamoylamino groups, N, N-dimethylaminosulfonylamino groups, Nn-octylaminosulfonylamino groups, alkyl and arylsulfonylamino groups (preferably carbon A substituted or unsubstituted alkylsulfonylamino having 1 to 30 carbon atoms, a substituted or unsubstituted arylsulfonylamino group having 6 to 30 carbon atoms, such as a methylsulfonylamino group, a butylsulfonylamino group, a phenylsulfonylamino group, 2, 3 , 5-trichlorophenylsulfonylamino group, p-methylphenylsulfonylamino group), mercapto group, alkylthio group (preferably a substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms such as methylthio group, ethylthio group, n- Hexadecylthio group), arylthio group (Preferably a substituted or unsubstituted arylthio group having 6 to 30 carbon atoms, for example, phenylthio group, p-chlorophenylthio group, m-methoxyphenylthio group), heterocyclic thio group (preferably substituted having 2 to 30 carbon atoms) Or an unsubstituted heterocyclic thio group, for example, 2-benzothiazolylthio group, 1-phenyltetrazol-5-ylthio group),

Sulfamoyl group (preferably a substituted or unsubstituted sulfamoyl group having 0 to 30 carbon atoms such as N-ethylsulfamoyl group, N- (3-dodecyloxypropyl) sulfamoyl group, N, N-dimethylsulfamoyl group , N-acetylsulfamoyl group, N-benzoylsulfamoyl group, N- (N′phenylcarbamoyl) sulfamoyl group), sulfo group, alkyl and arylsulfinyl group (preferably substituted or non-substituted having 1 to 30 carbon atoms) Substituted alkylsulfinyl groups, 6-30 substituted or unsubstituted arylsulfinyl groups such as methylsulfinyl group, ethylsulfinyl group, phenylsulfinyl group, p-methylphenylsulfinyl group), alkyl and arylsulfonyl groups (preferably C1-C30 substituted or unsubstituted An alkylsulfonyl group, a 6-30 substituted or unsubstituted arylsulfonyl group such as a methylsulfonyl group, an ethylsulfonyl group, a phenylsulfonyl group, a p-methylphenylsulfonyl group), an acyl group (preferably a formyl group, 2 carbon atoms) -30 substituted or unsubstituted alkylcarbonyl group, C7-30 substituted or unsubstituted arylcarbonyl group such as acetyl group and pivaloylbenzoyl group), aryloxycarbonyl group (preferably 7 carbon atoms) To 30 substituted or unsubstituted aryloxycarbonyl groups such as phenoxycarbonyl group, o-chlorophenoxycarbonyl group, m-nitrophenoxycarbonyl group, p-tert-butylphenoxycarbonyl group), alkoxycarbonyl group (preferably, C2-C30 substitution or Unsubstituted alkoxycarbonyl group, for example, methoxycarbonyl group, ethoxycarbonyl group, tert-butoxycarbonyl group, n-octadecyloxycarbonyl group), carbamoyl group (preferably a substituted or unsubstituted carbamoyl group having 1 to 30 carbon atoms, For example, carbamoyl group, N-methylcarbamoyl group, N, N-dimethylcarbamoyl group, N, N-di-n-octylcarbamoyl group, N- (methylsulfonyl) carbamoyl group), aryl and heterocyclic azo groups (preferably C6-C30 substituted or unsubstituted arylazo group, C3-C30 substituted or unsubstituted heterocyclic azo group, for example, phenylazo group, p-chlorophenylazo group, 5-ethylthio-1,3,4 -Thiadiazol-2-ylazo group), imide group (preferably N-sul Succinimide group, N-phthalimido group), phosphino group (preferably a substituted or unsubstituted phosphino group having 2 to 30 carbon atoms, such as dimethylphosphino group, diphenylphosphino group, methylphenoxyphosphino group), phosphinyl group (Preferably a substituted or unsubstituted phosphinyl group having 2 to 30 carbon atoms, for example, phosphinyl group, dioctyloxyphosphinyl group, diethoxyphosphinyl group), phosphinyloxy group (preferably having 2 carbon atoms) -30 substituted or unsubstituted phosphinyloxy group, for example, diphenoxyphosphinyloxy group, dioctyloxyphosphinyloxy group, phosphinylamino group (preferably substituted or substituted with 2 to 30 carbon atoms) Unsubstituted phosphinylamino group such as dimethoxyphosphinylamino group, dimethylamino Phosphinyl amino group), a silyl group (preferably, represents a substituted or unsubstituted silyl group having 3 to 30 carbon atoms, e.g., trimethylsilyl group, tert- butyldimethylsilyl group, a phenyldimethylsilyl group).

Among the above substituents, those having a hydrogen atom may be substituted with the above groups after removing this. Examples of such a functional group include an alkylcarbonylaminosulfonyl group, an arylcarbonylaminosulfonyl group, an alkylsulfonylaminocarbonyl group, and an arylsulfonylaminocarbonyl group. Specific examples include a methylsulfonylaminocarbonyl group, p- Examples include methylphenylsulfonylaminocarbonyl group, acetylaminosulfonyl group, and benzoylaminosulfonyl group.

  Moreover, when there are two or more substituents, they may be the same or different. If possible, they may be linked together to form a ring.

Preferred compounds represented by formula (VA) are those in which R ¹¹ is a methyl group, R ¹² and R ¹⁵ are both hydrogen atoms, and R ¹³ has 3 or more carbon atoms. An alkyl group, and L ¹ is a single bond, —O—, —CO—, —NR—, —SO ₂ NR—, —NRSO ₂ —, —CONR—, —NRCO—, —COO—, and OCO—. , An alkynylene group (R represents a hydrogen atom, an optionally substituted alkyl group or an aryl group, preferably a hydrogen atom), and L ² represents —O— or NR— (R represents a hydrogen atom). Represents an alkyl group or an aryl group which may have a substituent, preferably a hydrogen atom.), Ar ¹ is an arylene group, and n is 3-6.

Specific examples of the compounds represented by formulas (VA) and (VB) will be described below in detail, but the present invention is not limited to the following specific examples.

  The compound represented by the general formula (III) can be synthesized by first synthesizing a substituted benzoic acid, followed by a general ester reaction or amidation reaction between the substituted benzoic acid and a phenol derivative or aniline derivative. Any reaction may be used as long as it is a formation reaction. For example, a method of converting a substituted benzoic acid to an acid halide and then condensing it with a phenol derivative or aniline derivative, a method of dehydrating condensation of a substituted benzoic acid and a phenol derivative or aniline derivative using a condensing agent or catalyst, etc. It is done.

  As a method for producing the compound represented by the general formula (III), a method in which a substituted benzoic acid is functionally converted to an acid halide and then condensed with a phenol derivative or an aniline derivative is preferable in consideration of the production process and the like.

  In the method for producing the compound represented by the general formula (III), examples of the reaction solvent include hydrocarbon solvents (preferably toluene and xylene), ether solvents (preferably dimethyl ether, tetrahydrofuran, dioxane and the like). ), Ketone solvents, ester solvents, acetonitrile, dimethylformamide, dimethylacetamide, and the like. These solvents may be used alone or in admixture of several kinds, and the solvent is preferably toluene, acetonitrile, dimethylformamide, or dimethylacetamide.

  The reaction temperature is preferably 0 to 150 ° C, more preferably 0 to 100 ° C, still more preferably 0 to 90 ° C, and particularly preferably 20 ° C to 90 ° C.

  Moreover, it is preferable not to use a base for this reaction. When a base is used, it may be either an organic base or an inorganic base, preferably an organic base, such as pyridine or tertiary alkylamine (preferably triethylamine, ethyldiisopropylamine, etc.).

  The compounds represented by the general formulas (VA) and (VB) can be synthesized by a known method. For example, in the case of a compound where n = 4, a raw material compound having the following structure A and a hydroxyl group The following intermediate B 2 molecule obtained by reaction with a derivative having a reactive site such as an amino group can be obtained by linking with 1 molecule of the following compound C. However, the synthesis method of the compounds represented by the general formulas (VA) and (VB) is not limited to this example.

In the formula, A represents a reactive group such as a hydroxyl group or a halogen atom, R ¹¹ , R ¹² , R ¹³ , and R ¹⁵ are as described above, and R ⁴ represents a hydrogen atom or OR ¹⁴ described above. Is a substituent.

In the formula, A ′ represents a reactive group such as a carboxyl group, and R ¹¹ , R ¹² , R ¹³ , R ¹⁴ , R ¹⁵ , Ar ¹ , and L ¹ are as described above.

In the formula, B and B ′ represent a reactive group such as a hydroxyl group and an amino group, and Ar ² and L ² have the same meanings as Ar ¹ and L ¹ described above.

  The content of the Rth enhancer represented by the general formulas (I) and (III) to (V) in the present invention with respect to 100 parts by mass of cellulose acylate is preferably 0.1 to 30% by mass, and 1 to 25% by mass. Is more preferable, and 3 to 15% by mass is even more preferable.

  When the cellulose acylate film is produced by a solvent cast method, the Rth enhancer may be added to the dope. The timing of adding the Rth enhancer is not particularly limited, and the Rth enhancer is dissolved in an organic solvent such as alcohol, methylene chloride, dioxolane, etc., and then added to the cellulose acylate solution (dope) or directly in the dope composition. It may be added inside.

  As the Rth enhancer, one type of the compounds represented by the general formulas (I) and (III) to (V) may be used alone, or two or more types may be mixed and used. Moreover, in this invention, combined use of the Rth expression agent represented by general formula (I), (III)-(V) is also preferable.

The cellulose acylate film may contain an ultraviolet absorber for adjusting the wavelength dispersion. The ultraviolet absorber can also function as an Rth enhancer. Examples of the ultraviolet absorbers include oxybenzophenone compounds, benzotriazole compounds, salicylic acid ester compounds, benzophenone compounds, cyanoacrylate compounds, nickel complex compounds, and the like. System compounds are preferred. Further, ultraviolet absorbers described in JP-A-10-182621 and JP-A-8-337574 and polymer ultraviolet absorbers described in JP-A-6-148430 are also preferably used. The cellulose acylate film used as the second optically anisotropic layer has an excellent ability to absorb ultraviolet rays having a wavelength of 370 nm or less from the viewpoint of preventing deterioration of a polarizer and liquid crystal as an ultraviolet absorber, and From the viewpoint of liquid crystal display properties, those that absorb less visible light having a wavelength of 400 nm or more are preferred.

  Specific examples of the benzotriazole ultraviolet absorber useful in the present invention include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert). -Butylphenyl) benzotriazole, 2- (2'-hydroxy-3'-tert-butyl-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-tert-butyl Phenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3 ′-(3 ″, 4 ″, 5 ″, 6 ″ -tetrahydrophthalimidomethyl) -5′-methylphenyl) benzotriazole, 2,2 -Methylenebis (4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol), 2- (2 ' Hydroxy-3'-tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2H-benzotriazol-2-yl) -6- (linear and side chain dodecyl) -4-methylphenol Octyl-3- [3-tert-butyl-4-hydroxy-5- (chloro-2H-benzotriazol-2-yl) phenyl] propionate and 2-ethylhexyl-3- [3-tert-butyl-4-hydroxy Examples include, but are not limited to, a mixture of -5- (5-chloro-2H-benzotriazol-2-yl) phenyl] propionate. As commercially available products, TINUVIN 109, TINUVIN 171 and TINUVIN 326 (all manufactured by Ciba Specialty Chemicals Co., Ltd.) can be preferably used.

The cellulose acylate film may contain triphenyl phosphate, biphenyl phosphate or the like as a plasticizer.

[Example 1]
The effect of the VA liquid crystal display device having the configuration shown in FIG. 2A-2 was confirmed by performing an optical simulation. For the optical calculation, LCD Master Ver 6.08 manufactured by Shintech Co., Ltd. was used. As the VA liquid crystal material, the RGB patterning positive a-plate layer, and the negative c-plate layer, materials having a wavelength dispersion of birefringence Δn shown in FIG. 3 are used, and the orientation of the VA liquid crystal material is almost vertical at a pretilt angle of 89 °. The orientation was calculated, and the calculation was performed in a 4-domain multi-domain using the extended function of LCD Master. The cell gap of the substrate was 3.6 μm, and the retardation Rth in the thickness direction of the VA liquid crystal cell was 318 nm at a wavelength of 450 nm, 300 nm at a wavelength of 550 nm, and 295 nm at a wavelength of 650 nm. The voltage applied to the VA liquid crystal was 4.0 V during white display and 0.0 V during black display. G1220DU was used as the polarizing film, and a light source having the transmittance shown in FIG. 4 after passing through the R, G, and B color filters was used.

  For the VA liquid crystal display device described above, the RGB patterning positive a-plate layer has a thickness of 0.01 μm in the range of 0.01 to 0.80 μm and the negative c-plate layer has a thickness of 0.01 to 3. The amount of light leakage at each polar angle and azimuth angle was calculated while changing by 0.02 μm in the range of 30 μm. Table 1 shows ten conditions in which the front contrast ratio of the polar angle of 60 ° and the azimuth angle of 45 ° is the largest under the condition that the color shift Δu′v ′ is 0.02 or less. Here, the color shift Δu′v ′ refers to u′v ′ calculated from light leakage measured at various viewing angles (chromaticity information representing color: CIE (International Commission on Illumination) color system) Is the maximum value of the distance of each point when the coordinate plot is performed (value obtained from the Lu′v ′ color system of uniform color space obtained by performing a continuous conversion). In this embodiment, the polar angle is set to 0. The azimuth angle was changed in increments of 22.5 ° in the range of 0 ° to 360 ° in increments of 20 ° in the range of 0 ° to 60 °.

In general, the preferred viewing angle performance of the display is that the color shift Δu′v ′ is 0.02 or less, the ratio of the contrast at the polar angle of 60 ° and the azimuth angle of 45 ° to the front contrast is 10% or more, Preferably it is 20% or more. From the results of Table 1, | Re (R) −Re (G) | / | Re (G) −Re (B) | <1, that is, | Re (R) −Re (G) | <| Re (G) -Re (B) | and | d (R) -d (G) | / | d (G) -d (B) | <1, that is, | d (R) -d (G) | <| d When the condition (G) -d (B) | is satisfied, the front contrast ratio of the contrast at a polar angle of 60 ° and an azimuth angle of 45 ° is maintained while maintaining a low color shift region where Δu′v ′ is 0.02 or less. It can be seen that a liquid crystal display with a wide viewing angle can be realized.

It is a schematic sectional drawing of an example of the board | substrate for liquid crystal display devices of this invention. It is a schematic sectional drawing of an example of the liquid crystal display device of this invention. It is the figure which showed the wavelength dispersion of birefringence (DELTA) n of the VA liquid crystal material used in the Example, RGB patterning positive a-plate layer, and negative c-plate layer. It is the figure which showed the transmittance | permeability after passing each R, G, B color filter of the light source used in the Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Liquid crystal display substrate 12 Substrate 13 Color filter layer 13R Red color filter layer 13G Green color filter layer 13B Blue color filter layer 14 Black matrix 15 Patterning positive a-plate optical anisotropic layer 15r Optical anisotropy with respect to red 15a of the optically anisotropic layer 15b of the optically anisotropic layer for green The pattern 16 of the optically anisotropic layer for blue The positive or negative c-plate optically anisotropic layer 17 The positive or negative c-plate optical compensation sheet 21 Transparent Electrode layer 22 Alignment layer 23 VA liquid crystal layer 24 TFT array 25 Cellulose acetate film 26 Polarizing layer 27 Liquid crystal cell 28 Polarizing plate (backlight side)
29 Polarizing plate (display side)

Claims (8)

A substrate, a color filter layer having three color regions of R, G, and B, and a region having a front retardation of Re (R), Re (G), and Re (B) according to the region are patterned. A substrate for a liquid crystal display device, comprising a positive uniaxial optically anisotropic layer having an optical axis in the formed plane and satisfying the following formula (1):
Formula (1) | Re (R) -Re (G) | <| Re (G) -Re (B) | The film thicknesses of the regions having the front retardation of Re (R), Re (G), and Re (B) in the optically anisotropic layer were d (R), d (G), and d (B), respectively. The substrate for a liquid crystal display device according to claim 1, wherein the following formula (2) is satisfied.
Formula (2) | d (R) -d (G) | <| d (G) -d (B) |   The substrate for a liquid crystal display device according to claim 2, wherein d (R) = d (G)> d (B).   The substrate for a liquid crystal display device according to claim 2, wherein d (G)> d (R)> d (B).   The substrate for a liquid crystal display device according to any one of claims 1 to 4, comprising a uniaxial optically anisotropic layer having an optical axis in a normal direction of the substrate surface. A liquid crystal cell comprising: a pair of polarizing plates; a liquid crystal display substrate according to claim 5 as a liquid crystal display device substrate on a display side between the pair of polarizing plates; and a liquid crystal cell including a liquid crystal layer. Including a liquid crystal display device. A substrate for a liquid crystal display device according to any one of claims 1 to 4, as a substrate for a liquid crystal display device on a display side, between the pair of polarizing plates and the pair of polarizing plates, a substrate for a backlight side liquid crystal display device, And a liquid crystal cell including a liquid crystal layer, and a liquid crystal display including a uniaxial optical anisotropic layer in which one of the polarizing plates or the substrate for the backlight side liquid crystal display device has an optical axis in the normal direction of the substrate surface apparatus.   8. The liquid crystal display device according to claim 6, wherein the alignment mode of the liquid crystal layer is a VA mode, an IPS mode, or an FFS mode.

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