WO2015137446A1

WO2015137446A1 - Liquid crystal display device

Info

Publication number: WO2015137446A1
Application number: PCT/JP2015/057294
Authority: WO
Inventors: 佐藤　寛; 千枝新福; 晶山本; 雄二郎矢内; 義明久門
Original assignee: 富士フイルム株式会社
Priority date: 2014-03-13
Filing date: 2015-03-12
Publication date: 2015-09-17
Also published as: JPWO2015137446A1; TW201539092A

Abstract

The present invention addresses the problem of providing a liquid crystal display device which exhibits excellent display performance even when thinly formed, and excellent durability to temperature and humidity changes in the environment. The present invention pertains to a liquid crystal display device having, in order from the viewing side to the backlight side, a first polarizer (P1), a first optically anisotropic layer (B1), a first liquid crystal compound-containing optically anisotropic layer (C1), a vertical alignment mode liquid crystal cell, a second liquid crystal compound-containing optically anisotropic layer (C2), a second optically anisotropic layer (B2), and a second polarizer (P2), wherein: the polarizers (P1, P2) are positioned in a manner such that the absorption axes thereof are perpendicular to one another; the thicknesses of the optically anisotropic layers (C1, C2) are both 10μm or less; the optically anisotropic layers (C1, C2) satisfy prescribed relational expressions (1-1 to 1-2); and the optically anisotropic layers (B1, B2) satisfy prescribed relational expressions (1-3 to 1-7).

Description

Liquid crystal display

The present invention relates to a liquid crystal display device having a vertical alignment mode liquid crystal cell.

In recent years, liquid crystal display devices have been made thinner, and accordingly, members (for example, polarizing plates) used are required to be made thinner. As a method of thinning the polarizing plate, for example, a method of thinning the polarizer itself or the protective film of the polarizer, a method of eliminating the protective film or retardation film disposed between the polarizer and the liquid crystal cell, etc. Can be mentioned.

As a liquid crystal display device that can be thinned, for example, Patent Document 1 discloses that “a liquid crystal cell having a liquid crystal layer that is vertically aligned with respect to a substrate during black display, and an absorption axis of each of the liquid crystal cells sandwiching each other. A liquid crystal display device having two polarizers arranged orthogonally and a retardation film arranged between each of the two polarizers and a liquid crystal cell and having the same optical anisotropy The liquid crystal display device, wherein the retardation film contains cellulose acylate and a liquid crystal compound, and satisfies the following formulas (I) to (IV).
(I) 30 ≦ Re (550) ≦ 80
(II) 70 ≦ Rth (550) ≦ 140
(III) Re (450) / Re (550) <1
(IV) Re (650) / Re (550)> 1
(Re (λ) is the in-plane retardation [nm] measured at wavelength λ [nm], and Rth (λ) is the retardation [nm] in the film thickness direction measured at wavelength λ [nm]. ")".

JP 2010-020269 A

The inventors of the present invention have studied the liquid crystal display device described in Patent Document 1, and have improved color change (color shift) and light leakage (black luminance) that occur when the liquid crystal cell is observed from an oblique direction. It has been clarified that there is room and display unevenness may occur due to changes in the temperature and humidity environment.

Therefore, the present invention provides a liquid crystal display that is excellent in display performance (prevention of color change and light leakage) even when it is thinned, and excellent in durability against temperature / humidity change (performance of suppressing display unevenness). It is an object to provide an apparatus.

As a result of diligent research to achieve the above-mentioned problems, the inventors of the present invention have performed optical compensation of the vertical alignment mode liquid crystal cell with two optical anisotropies (one on the viewing side and one on the backlight side) having desired optical characteristics. When the liquid crystal display device is thinned by securing the optical compensation of each of the viewing side polarizer and the backlight side polarizer with an optically anisotropic layer having desired optical characteristics. Even if it exists, it discovered that it was excellent in display performance and the durability with respect to a temperature / humidity environmental change, and completed this invention.
That is, it has been found that the above object can be achieved by the following configuration.

[1] Optically anisotropic layer (C1) having first polarizer (P1), first optically anisotropic layer (B1), and first liquid crystalline compound in the direction from the viewer side to the backlight side , A vertical alignment mode liquid crystal cell, an optically anisotropic layer (C2) having a second liquid crystalline compound, a second optically anisotropic layer (B2), and a second polarizer (P2) in this order. And
The polarizer (P1) and the polarizer (P2) are arranged with their respective absorption axes orthogonal to each other,
The thickness of each of the optically anisotropic layer (C1) and the optically anisotropic layer (C2) is 10 μm or less,
The optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formulas (1-1) and (1-2),
Re (550) ≦ 30 nm Formula (1-1)
10 nm ≦ Rth (550) ≦ 100 nm Formula (1-2)
The optically anisotropic layer (B1) and the optically anisotropic layer (B2) are all represented by the following formulas (1-3), (1-4), (1-5), (1-6) and (1- The liquid crystal display device satisfying 7).
20 nm ≦ Re (550) ≦ 160 nm Formula (1-3)
20 nm ≦ Rth (550) ≦ 160 nm Formula (1-4)
Rth (550) ≧ (−9) × Re (550) +400 nm Formula (1-5)
Rth (550) ≦ (−9/5) × Re (550) +310 nm Formula (1-6)
Re (450) / Re (550) ≦ 1.05 Formula (1-7)
(Re (λ) represents in-plane retardation at wavelength λnm, and Rth (λ) represents retardation in the thickness direction at wavelength λnm.)

[2] In the direction from the viewer side to the backlight side, the first polarizer (P1), the optically anisotropic layer (C1) having the first liquid crystalline compound, and the first optically anisotropic layer (B1) A vertical alignment mode liquid crystal cell, a second optically anisotropic layer (B2), an optically anisotropic layer (C2) having a second liquid crystalline compound, and a second polarizer (P2) in this order. And
The polarizer (P1) and the polarizer (P2) are arranged with their respective absorption axes orthogonal to each other,
The thickness of each of the optically anisotropic layer (C1) and the optically anisotropic layer (C2) is 10 μm or less,
The optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formulas (2-1) and (2-2),
Re (550) ≦ 30 nm Formula (2-1)
30 nm ≦ Rth (550) ≦ 120 nm Formula (2-2)
A liquid crystal display device in which the optically anisotropic layer (B1) and the optically anisotropic layer (B2) all satisfy the following formulas (2-3), (2-4), and (2-5).
15 nm ≦ Re (550) ≦ 70 nm Formula (2-3)
20 nm ≦ Rth (550) ≦ 120 nm Formula (2-4)
Re (450) / Re (550) ≦ 1.1 Formula (2-5)
(Re (λ) represents in-plane retardation at wavelength λnm, and Rth (λ) represents retardation in the thickness direction at wavelength λnm.)

[3] In the direction from the viewer side to the backlight side, the first polarizer (P1), the optically anisotropic layer (A1) having the first liquid crystalline compound, and the first optically anisotropic layer (C1) A vertical alignment mode liquid crystal cell, a second optically anisotropic layer (C2), an optically anisotropic layer (A2) having a second liquid crystalline compound, and a second polarizer (P2) in this order. And
The polarizer (P1) and the polarizer (P2) are arranged with their respective absorption axes orthogonal to each other,
The thicknesses of the optically anisotropic layer (A1) and the optically anisotropic layer (A2) are both 10 μm or less,
The optically anisotropic layer (A1) and the optically anisotropic layer (A2) all satisfy the following formulas (3-1), (3-2) and (3-3),
50 nm ≦ Re (550) ≦ 130 Formula (3-1)
20 nm ≦ Rth (550) ≦ 70 Formula (3-2)
Re (450) / Re (550) ≦ 1.05 Formula (3-3)
A liquid crystal display device in which the optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formulas (3-4) and (3-5).
Re (550) ≦ 30 nm Formula (3-4)
20 nm ≦ Rth (550) ≦ 120 Formula (3-5)
(Re (λ) represents in-plane retardation at wavelength λnm, and Rth (λ) represents retardation in the thickness direction at wavelength λnm.)

[4] Optically anisotropic layer (A1) having first polarizer (P1), first optically anisotropic layer (C1), and first liquid crystalline compound in the direction from the viewer side to the backlight side , A vertical alignment mode liquid crystal cell, an optically anisotropic layer (A2) having a second liquid crystalline compound, a second optically anisotropic layer (C2), and a second polarizer (P2) in this order. And
The polarizer (P1) and the polarizer (P2) are arranged with their respective absorption axes orthogonal to each other,
The thicknesses of the optically anisotropic layer (A1) and the optically anisotropic layer (A2) are both 10 μm or less,
The optically anisotropic layer (A1) and the optically anisotropic layer (A2) all satisfy the following formulas (4-1), (4-2) and (4-3),
10 nm ≦ Re (550) ≦ 70 nm Formula (4-1)
0 nm ≦ Rth (550) ≦ 40 nm Formula (4-2)
Re (450) / Re (550) ≦ 1.05 Formula (4-3)
A liquid crystal display device in which the optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formulas (4-4) and (4-5).
Re (550) ≦ 30 nm Formula (4-4)
70 nm ≦ Rth (550) ≦ 180 nm Formula (4-5)
(Re (λ) represents in-plane retardation at wavelength λnm, and Rth (λ) represents retardation in the thickness direction at wavelength λnm.)

[5] The liquid crystalline compounds contained in the optically anisotropic layer (C1) and the optically anisotropic layer (C2) are both discotic liquid crystalline compounds,
The liquid crystal display device according to [1] or [2], wherein the optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formula (5).
0.9 <Re40 (450) / Re40 (550) ≦ 1.2 Formula (5)
(Re40 (λ) represents retardation measured from a polar angle of 40 ° at a wavelength of λnm.)
[6] The optically anisotropic layer (C1) and the optically anisotropic layer (C2) both contain a discotic liquid crystalline compound,
The liquid crystal display device according to [3] or [4], wherein the optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formula (5).
0.9 <Re40 (450) / Re40 (550) ≦ 1.2 Formula (5)
(Re40 (λ) represents retardation measured from a polar angle of 40 ° at a wavelength of λnm.)
[7] Any of [3], [4] and [6], wherein the liquid crystalline compounds contained in the optically anisotropic layer (A1) and the optically anisotropic layer (A2) are all rod-like liquid crystalline compounds. A liquid crystal display device according to claim 1.
[8] The liquid crystal display device according to [7], wherein the optically anisotropic layer (A1) and the optically anisotropic layer (A2) both satisfy the following formula (6).
Re (450) / Re (550) <1.0 Formula (6)
(Re (λ) represents in-plane retardation at wavelength λ nm.)
[9] The liquid crystal according to [2], wherein the polarizer (P1) and the optically anisotropic layer (C1) are adjacent to each other, and the polarizer (P2) and the optically anisotropic layer (C2) are adjacent to each other. Display device.
[10] The liquid crystal according to [3], wherein the polarizer (P1) and the optically anisotropic layer (A1) are adjacent to each other, and the polarizer (P2) and the optically anisotropic layer (A2) are adjacent to each other. Display device.
[11] The polarizer (P1) and the optically anisotropic layer (C1) are stacked via the alignment film, and the polarizer (P2) and the optically anisotropic layer (C2) are stacked via the alignment film. The liquid crystal display device according to [2].
[12] The polarizer (P1) and the optically anisotropic layer (A1) are stacked via the alignment film, and the polarizer (P2) and the optically anisotropic layer (A2) are stacked via the alignment film. The liquid crystal display device according to [3].
[13] The polarizer (P1) and the optically anisotropic layer (C1) are laminated via an adhesive layer or an adhesive layer, and the polarizer (P2) and the optically anisotropic layer (C2) are adhesives. The liquid crystal display device according to [2], which is laminated via a layer or an adhesive layer.
[14] The polarizer (P1) and the optically anisotropic layer (A1) are laminated via an adhesive layer or an adhesive layer, and the polarizer (P2) and the optically anisotropic layer (A2) are adhesives. The liquid crystal display device according to [3], which is laminated via a layer or an adhesive layer.
[15] A protective film is provided on one or both of the viewing side of the polarizer (P1) and the backlight side of the polarizer (P2),
Moisture permeability of the protective film is not more than 100g / m ² / 24h, a liquid crystal display device according to any one of [1] to [14].
[16] Optically anisotropic layer (A1), optically anisotropic layer (A2), optically anisotropic layer (B1), optically anisotropic layer (B2), optically anisotropic layer (C1), and The water vapor permeability of at least one optically anisotropic layer selected from the group consisting of the optically anisotropic layer (C2) is 50 g / m ² / 24h or less, and any one of [1] to [15] Liquid crystal display device.
[17] A laminate film is provided on one or both of the viewing side of the polarizer (P1) and the backlight side of the polarizer (P2),
Moisture permeability of the laminated film is not more than 30g / m ² / 24h, a liquid crystal display device according to any one of [1] to [14].
[18] The liquid crystal display device according to any one of [1] to [17], wherein the thickness of at least one of the polarizer (P1) and the polarizer (P2) is 25 μm or less.

According to the present invention, it is possible to provide a liquid crystal display device that is excellent in display performance even when it is thinned and excellent in durability against changes in temperature and humidity environment.

1A to 1C are schematic cross-sectional views each showing an example of the first aspect of the liquid crystal display device of the present invention. 2A to 2C are schematic cross-sectional views showing examples of the second mode of the liquid crystal display device of the present invention. FIGS. 3A to 3C are schematic cross-sectional views each showing an example of the third aspect of the liquid crystal display device of the present invention. 4A to 4C are schematic cross-sectional views showing examples of the fourth aspect of the liquid crystal display device of the present invention.

Hereinafter, the present invention will be described in detail.
The description of the constituent elements described below may be made based on typical embodiments of the present invention, but the present invention is not limited to such embodiments.
In the present specification, a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
Next, terms used in this specification will be described.

<Re (λ), Rth (λ)>
In this specification, Re (λ) and Rth (λ) represent in-plane retardation and retardation in the thickness direction at the wavelength λ, respectively.
Re (λ) is measured by making light having a wavelength of λ nm incident in the normal direction of the film in KOBRA 21ADH or KOBRA WR (both manufactured by Oji Scientific Instruments). In selecting the measurement wavelength λnm, the wavelength selection filter can be exchanged manually, or the measurement value can be converted by a program or the like.

Here, when the film to be measured is represented by a uniaxial or biaxial refractive index ellipsoid, Rth (λ) is calculated by the following method.
Rth (λ) is Re (λ) with the in-plane slow axis (determined by KOBRA 21ADH or KOBRA WR) as the tilt axis (rotation axis) (in the absence of the slow axis, With respect to the film normal direction (with an arbitrary direction as the rotation axis), the light of wavelength λ nm is incident from each inclined direction in steps of 10 degrees from the normal direction to 50 degrees on one side, and a total of 6 points are measured. The KOBRA 21ADH or KOBRA WR is calculated based on the measured retardation value, the assumed value of the average refractive index, and the input film thickness value.
In the above case, in the case of a film having a direction in which the retardation value is zero at a certain tilt angle with the in-plane slow axis from the normal direction as the rotation axis, retardation at a tilt angle larger than the tilt angle. The value is calculated in KOBRA 21ADH or KOBRA WR after changing its sign to negative.
In addition, the retardation value is measured from the two inclined directions, with the slow axis as the tilt axis (rotation axis) (when there is no slow axis, the arbitrary direction in the film plane is the rotation axis), Based on the value, the assumed value of the average refractive index, and the input film thickness value, Rth can also be calculated from the following formulas (1) and (2).

In the formula, Re (θ) represents a retardation value in a direction inclined by an angle θ from the normal direction. Further, nx represents the refractive index in the slow axis direction in the plane, ny represents the refractive index in the direction perpendicular to nx in the plane, and nz represents the refractive index in the direction perpendicular to nx and ny. d represents the film thickness of the film.

In the case where the film to be measured cannot be expressed by a uniaxial or biaxial refractive index ellipsoid, that is, a film having no so-called optical axis (OPTIC AXIS), Rth (λ) is calculated by the following method.
Rth (λ) is -50 ° to + 50 ° with respect to the film normal direction with Re (λ) being the in-plane slow axis (determined by KOBRA 21ADH or KOBRA WR) as the tilt axis (rotation axis) 11 points of light having a wavelength of λ nm are incident from each inclined direction in 10 degree steps until KOBRA 21ADH is measured based on the measured retardation value, assumed average refractive index, and input film thickness value. Or it is calculated by KOBRA WR.

In the above measurement, as the assumed value of the average refractive index, values in the polymer handbook (John Wiley & Sons, Inc.) and catalogs of various optical films can be used. Those whose average refractive index is not known can be measured with an Abbe refractometer. The average refractive index values of main optical films are exemplified below: cellulose acylate (1.48), cycloolefin polymer (1.52), polycarbonate (1.59), polymethyl methacrylate (1.49), Polystyrene (1.59). By inputting the assumed value of the average refractive index and the film thickness, nx, ny, and nz are calculated in KOBRA 21ADH or KOBRA WR. Nz = (nx−nz) / (nx−ny) is further calculated from the calculated nx, ny, and nz.

In this specification, Re40 (λ) represents retardation measured from a polar angle of 40 ° at a wavelength λnm.
Further, the angle relationship (for example, “orthogonal”, “parallel”, “90 °”, etc.) includes a range of errors allowed in the technical field to which the present invention belongs. Specifically, it means that the angle is within a range of strict angle ± 10 °, and an error from the strict angle is preferably 5 ° or less, and more preferably 3 ° or less.

<Moisture permeability>
In this specification, moisture permeability refers to a sample in an atmosphere at a temperature of 40 ° C. and a relative humidity of 90% in accordance with the method described in “Moisture permeability test method for moisture-proof packaging materials (cup method)” of JIS Z 0208: 1976. Is the amount (g / m ² / day) converted per 1 m ^{2 of} area by measuring the mass of water vapor that passes through 24 hours.

[Liquid Crystal Display]
The liquid crystal display device of the present invention includes a vertical alignment mode liquid crystal cell and two polarizers (polarizers (P1) and (P2 described later) arranged with the absorption axes perpendicular to each other across the liquid crystal cell. )).

Here, in the liquid crystal display device according to the first aspect of the present invention, the first polarizer (P1), the first optical anisotropic layer (B1), the first, in the direction from the viewing side to the backlight side. An optically anisotropic layer (C1) having a liquid crystalline compound, a vertical alignment mode liquid crystal cell, an optically anisotropic layer (C2) having a second liquid crystalline compound, a second optically anisotropic layer (B2), In addition, the liquid crystal display device has the second polarizer (P2) in this order and satisfies the above-described formulas (1-1) to (1-7).
Further, the liquid crystal display device according to the second aspect includes a first polarizer (P1), an optically anisotropic layer (C1) having a first liquid crystalline compound, a first liquid crystal compound in the direction from the viewing side to the backlight side. 1 optically anisotropic layer (B1), vertical alignment mode liquid crystal cell, second optically anisotropic layer (B2), optically anisotropic layer (C2) having a second liquid crystalline compound, and second This is a liquid crystal display device having the polarizers (P2) in this order and satisfying the above-described formulas (2-1) to (2-5).
Further, the liquid crystal display device according to the third aspect includes a first polarizer (P1), an optically anisotropic layer (A1) having a first liquid crystalline compound, a first liquid crystal compound in the direction from the viewer side to the backlight side. 1 optically anisotropic layer (C1), vertical alignment mode liquid crystal cell, second optically anisotropic layer (C2), optically anisotropic layer (A2) having a second liquid crystalline compound, and second This is a liquid crystal display device having the polarizers (P2) in this order and satisfying the above-mentioned formulas (3-1) to (3-5).
The liquid crystal display device according to the fourth aspect includes a first polarizer (P1), a first optically anisotropic layer (C1), and a first liquid crystalline compound in the direction from the viewing side to the backlight side. An optically anisotropic layer (A1) having a vertical alignment mode liquid crystal cell, an optically anisotropic layer (A2) having a second liquid crystalline compound, a second optically anisotropic layer (C2), and a second This is a liquid crystal display device having the polarizers (P2) in this order and satisfying the above-mentioned formulas (4-1) to (4-5).

With such a configuration, even when the liquid crystal display device is thinned, the display performance is good, and the durability against changes in the temperature and humidity environment is also good.
Although this is not clear in detail, the present inventors presume as follows.
That is, the optical compensation of the vertical alignment mode liquid crystal cell is performed by the optical anisotropic layers (C1) and (C2) arranged with the liquid crystal cell interposed therebetween, and the optical compensation of each of the polarizers (P1) and (P2). This is considered to be because the optical compensation function could be appropriately separated by performing the steps in the optically anisotropic layers (B1) and (B2) or the optically anisotropic layers (A1) and (A2). .
In addition, by providing a thin optically anisotropic layer containing a liquid crystal compound between the polarizer and the vertical alignment mode liquid crystal cell, display unevenness due to backlight deformation and changes in the temperature and humidity environment is suppressed. It is thought that it was possible.

Next, the first to fourth aspects of the liquid crystal display device of the present invention will be described with reference to FIGS. 1 to 4, respectively.

[First embodiment]
FIG. 1 is a schematic cross-sectional view showing an example of a liquid crystal display device according to the first aspect of the present invention.
A liquid crystal display device 40 shown in FIG. 1A includes a first polarizer (P1) 1, a first optically anisotropic layer (B1) 2, and a first liquid crystal in the direction from the viewing side to the backlight side. Optically anisotropic layer (C1) 3 having a luminescent compound, vertical alignment mode liquid crystal cell 20, optically anisotropic layer (C2) 13 having a second liquid crystalline compound, and second optically anisotropic layer (B2) 12 and the second polarizer (P2) 11 in this order, and the absorption axis of the polarizer (P1) 1 and the absorption axis of the polarizer (P2) 11 are arranged orthogonally.
Further, the liquid crystal display device 40 shown in FIG. 1B has an arbitrary protective film 4 on the viewing side of the polarizer (P1) 1 of the liquid crystal display device shown in FIG. 1A, and the polarizer (P2). 11 has an optional protective film 14 on the backlight side. Note that the optional protective film is provided only on one of the viewing side of the polarizer (P1) 1 and the backlight side of the polarizer (P2) 11 separately from the embodiment shown in FIG. Also good.
In addition, the liquid crystal display device 40 in FIG. 1C has an arbitrary laminate film 5 on the viewing side of the protective film 4 of the liquid crystal display device shown in FIG. In this embodiment, the laminate film 15 is provided. In addition, the arbitrary laminated film may have only in any one of the visual recognition side of the protective film 4, and the backlight side of the protective film 14 separately from the aspect shown to FIG. You may have in the aspect which does not have a film | membrane, ie, at least one of the visual recognition side of polarizer (P1) 1, and the backlight side of polarizer (P2) 11.
Moreover, in FIG. 1, the code | symbol 10 shows the visual recognition side polarizing plate, and the code | symbol 30 shows a backlight side polarizing plate.

In the liquid crystal display device according to the first aspect, the optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formulas (1-1) and (1-2), and The optically anisotropic layer (B1) and the optically anisotropic layer (B2) are all represented by the following formulas (1-3), (1-4), (1-5), (1-6) and (1- This is a mode that satisfies 7).
<Optically Anisotropic Layer (C1) and Optical Anisotropic Layer (C2)>
・ Re (550) ≦ 30 nm Formula (1-1)
・ 10 nm ≦ Rth (550) ≦ 100 nm Formula (1-2)
<Optically anisotropic layer (B1) and optically anisotropic layer (B2)>
・ 20nm ≦ Re (550) ≦ 160nm Formula (1-3)
・ 20nm ≦ Rth (550) ≦ 160nm Formula (1-4)
Rth (550) ≧ (−9) × Re (550) +400 nm Formula (1-5)
Rth (550) ≦ (−9/5) × Re (550) +310 nm Formula (1-6)
Re (450) / Re (550) ≦ 1.05 Formula (1-7)

Here, in the first aspect, the optically anisotropic layer (C1) and the optically anisotropic layer (C2) are more reduced in light leakage (black luminance) generated when observed from an oblique direction. In this case, Re (550) is preferably 20 nm or less, more preferably 10 nm or less, and Rth (550) is 20 nm to 90 nm for the reason that the display performance is better. The thickness is preferably 25 nm to 80 nm.
In addition, the optically anisotropic layer (B1) and the optically anisotropic layer (B2) are further suppressed in light leakage (black luminance) generated when observed from an oblique direction, and display performance even when the thickness is reduced. Therefore, Re (550) is preferably 35 nm to 140 nm, more preferably 45 nm to 120 nm, Rth (550) is preferably 30 nm to 120 nm, and 40 nm to 100 nm. More preferably. Furthermore, the color change (color shift) that occurs when observed from an oblique direction is further suppressed, and even when the thickness is reduced, the display performance is better. Therefore, Re (450) / Re (550) is 1. 0.0 or less is preferable, and 0.95 or less is more preferable.

In the first embodiment, the thicknesses of the optically anisotropic layer (C1) and the optically anisotropic layer (C2) having a liquid crystal compound are both 10 μm or less, preferably 7 μm or less, More preferably, it is 5 μm or less.

[Second embodiment]
FIG. 2 is a schematic cross-sectional view showing an example of a liquid crystal display device according to the second aspect of the present invention.
A liquid crystal display device 40 shown in FIG. 2A includes an optically anisotropic layer (C1) 3 having a first polarizer (P1) 1 and a first liquid crystal compound in the direction from the viewing side to the backlight side. , First optical anisotropic layer (B1) 2, vertical alignment mode liquid crystal cell 20, second optical anisotropic layer (B2) 12, optical anisotropic layer (C2) having second liquid crystalline compound 13 and the second polarizer (P2) 11 in this order, and the absorption axis of the polarizer (P1) 1 and the absorption axis of the polarizer (P2) 11 are arranged orthogonally.
2B has an optional protective film 4 on the viewing side of the polarizer (P1) 1 of the liquid crystal display device shown in FIG. 2A, and the polarizer (P2). 11 has an optional protective film 14 on the backlight side. Note that the optional protective film is provided only on one of the viewing side of the polarizer (P1) 1 and the backlight side of the polarizer (P2) 11 separately from the embodiment shown in FIG. Also good.
In addition, the liquid crystal display device 40 in FIG. 2C has an arbitrary laminate film 5 on the viewing side of the protective film 4 of the liquid crystal display device shown in FIG. In this embodiment, the laminate film 15 is provided. In addition, the arbitrary laminated film may have only in any one of the visual recognition side of the protective film 4, and the backlight side of the protective film 14 separately from the aspect shown to FIG. You may have in the aspect which does not have a film | membrane, ie, at least one of the visual recognition side of polarizer (P1) 1, and the backlight side of polarizer (P2) 11.
Moreover, in FIG. 2, the code | symbol 10 shows the visual recognition side polarizing plate, and the code | symbol 30 shows a backlight side polarizing plate.

In the liquid crystal display device according to the second aspect, the optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formulas (2-1) and (2-2), and The optically anisotropic layer (B1) and the optically anisotropic layer (B2) all satisfy the following formulas (2-3), (2-4) and (2-5).
<Optically Anisotropic Layer (C1) and Optical Anisotropic Layer (C2)>
・ Re (550) ≦ 30 nm (2-1)
・ 30nm ≦ Rth (550) ≦ 120nm Formula (2-2)
<Optically anisotropic layer (B1) and optically anisotropic layer (B2)>
・ 15nm ≦ Re (550) ≦ 70nm Formula (2-3)
・ 20nm ≦ Rth (550) ≦ 120nm Formula (2-4)
Re (450) / Re (550) ≦ 1.1 Formula (2-5)

Here, in the second aspect, the optically anisotropic layer (C1) and the optically anisotropic layer (C2) are further reduced in light leakage (black luminance) generated when observed from an oblique direction. In this case, Re (550) is preferably 20 nm or less, more preferably 10 nm or less, and Rth (550) is 35 nm to 110 nm because the display performance is better. The thickness is preferably 40 nm to 100 nm.
In addition, the optically anisotropic layer (B1) and the optically anisotropic layer (B2) are further suppressed in light leakage (black luminance) generated when observed from an oblique direction, and display performance even when the thickness is reduced. Therefore, Re (550) is preferably 20 nm to 65 nm, more preferably 25 nm to 60 nm, Rth (550) is preferably 30 nm to 100 nm, and 40 nm to 90 nm. More preferably. Furthermore, the color change (color shift) that occurs when observed from an oblique direction is further suppressed, and even when the thickness is reduced, the display performance is better. Therefore, Re (450) / Re (550) is 1. 0.0 or less is preferable, and 0.95 or less is more preferable.

In the second embodiment, the thicknesses of the optically anisotropic layer (C1) and the optically anisotropic layer (C2) having a liquid crystal compound are both 10 μm or less, preferably 7 μm or less, More preferably, it is 5 μm or less.

Further, in the second aspect, the liquid crystal display device can be made thinner, and the optical property having the polarizer (P1) and the liquid crystal compound is improved because the durability against changes in temperature and humidity environment is further improved. There is a configuration in which no member having a phase difference exists between the isotropic layer (C1) and between the polarizer (P2) and the optically anisotropic layer (C2) having a liquid crystal compound. Preferably, specifically, for example, a configuration in which the polarizer (P1) and the optically anisotropic layer (C1) are adjacent to each other, and the polarizer (P2) and the optically anisotropic layer (C2) are adjacent to each other ( 2); a polarizer (P1) and an optically anisotropic layer (C1) are laminated via an alignment film, and a polarizer (P2) and an optically anisotropic layer (C2) are interposed via an alignment film. Laminated structure; the polarizer (P1) and the optically anisotropic layer (C1) are interposed via an adhesive layer or a pressure-sensitive adhesive layer. Is a layer, a polarizer (P2) and the optically anisotropic layer (C2) and is configured are laminated through an adhesive layer or a pressure-sensitive adhesive layer; preferably the like.

[Third embodiment]
FIG. 3 is a schematic cross-sectional view showing an example of a liquid crystal display device according to the third aspect of the present invention.
The liquid crystal display device 40 shown in FIG. 3A includes an optically anisotropic layer (A1) 6 having a first polarizer (P1) 1 and a first liquid crystalline compound in the direction from the viewing side to the backlight side. , First optically anisotropic layer (C1) 3, vertical alignment mode liquid crystal cell 20, second optically anisotropic layer (C2) 13, and optically anisotropic layer (A2) having a second liquid crystalline compound 16 and the second polarizer (P2) 11 in this order, and the absorption axis of the polarizer (P1) 1 and the absorption axis of the polarizer (P2) 11 are arranged orthogonally.
3B has an optional protective film 4 on the viewing side of the polarizer (P1) 1 of the liquid crystal display device shown in FIG. 3A, and the polarizer (P2). 11 has an optional protective film 14 on the backlight side. In addition, the optional protective film is provided only on either the viewing side of the polarizer (P1) 1 or the backlight side of the polarizer (P2) 11 separately from the embodiment shown in FIG. Also good.
In addition, the liquid crystal display device 40 in FIG. 3C has an arbitrary laminate film 5 on the viewing side of the protective film 4 of the liquid crystal display device shown in FIG. In this embodiment, the laminate film 15 is provided. In addition, the arbitrary laminated film may have only in any one of the visual recognition side of the protective film 4, and the backlight side of the protective film 14 separately from the aspect shown to FIG. You may have in the aspect which does not have a film | membrane, ie, at least one of the visual recognition side of polarizer (P1) 1, and the backlight side of polarizer (P2) 11.
Moreover, in FIG. 3, the code | symbol 10 shows the visual recognition side polarizing plate, and the code | symbol 30 shows a backlight side polarizing plate.

In the liquid crystal display device according to the third aspect, the optically anisotropic layer (A1) and the optically anisotropic layer (A2) are all represented by the following formulas (3-1), (3-2) and (3-3): In addition, the optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formulas (3-4) and (3-5).
<Optically Anisotropic Layer (A1) and Optical Anisotropic Layer (A2)>
・ 50 nm ≦ Re (550) ≦ 130 Formula (3-1)
20 nm ≦ Rth (550) ≦ 70 Formula (3-2)
Re (450) / Re (550) ≦ 1.05 Formula (3-3)
<Optically Anisotropic Layer (C1) and Optical Anisotropic Layer (C2)>
・ Re (550) ≦ 30 nm (3-4)
20 nm ≦ Rth (550) ≦ 120 Formula (3-5)

Here, in the third aspect, the optically anisotropic layer (A1) and the optically anisotropic layer (A2) are further reduced in light leakage (black luminance) generated when observed from an oblique direction. In this case, Re (550) is preferably from 60 nm to 120 nm, more preferably from 70 nm to 110 nm, and Rth (550) is from 30 nm to 60 nm, for the reason that the display performance is even better. The thickness is preferably 35 nm to 55 nm. Furthermore, the color change (color shift) that occurs when observed from an oblique direction is further suppressed, and even when the thickness is reduced, the display performance is better. Therefore, Re (450) / Re (550) is 1. Is preferably less than 0.0, more preferably 0.95 or less.
On the other hand, the optically anisotropic layer (C1) and the optically anisotropic layer (C2) are more suppressed in light leakage (black luminance) that occurs when observed from an oblique direction, and display performance even when the thickness is reduced. Therefore, Re (550) is preferably 20 nm or less, more preferably 10 nm or less, and Rth (550) is preferably 30 nm to 100 nm, and preferably 40 nm to 90 nm. Is more preferable.

In the third aspect, the thicknesses of the optically anisotropic layer (A1) and the optically anisotropic layer (A2) having a liquid crystal compound are both 10 μm or less, preferably 7 μm or less, More preferably, it is 5 μm or less.

In the third aspect, the liquid crystal display device can be made thinner, and the durability against changes in the temperature and humidity environment can be further improved. There is a configuration in which no member having a phase difference exists between the isotropic layer (A1) and between the polarizer (P2) and the optically anisotropic layer (A2) having a liquid crystal compound. Preferably, specifically, for example, a configuration in which the polarizer (P1) and the optically anisotropic layer (A1) are adjacent to each other, and the polarizer (P2) and the optically anisotropic layer (A2) are adjacent to each other ( 3), the polarizer (P1) and the optically anisotropic layer (A1) are laminated via the alignment film, and the polarizer (P2) and the optically anisotropic layer (A2) are interposed via the alignment film. Laminated structure; the polarizer (P1) and the optically anisotropic layer (A1) are interposed via an adhesive layer or a pressure-sensitive adhesive layer. Is a layer, a polarizer (P2) and the optically anisotropic layer (A2) and is configured are laminated through an adhesive layer or a pressure-sensitive adhesive layer; preferably the like.

[Fourth Embodiment]
FIG. 4 is a schematic cross-sectional view showing an example of a liquid crystal display device according to the first aspect of the present invention.
A liquid crystal display device 40 shown in FIG. 4A includes a first polarizer (P1) 1, a first optical anisotropic layer (C1) 3, and a first liquid crystal in the direction from the viewing side to the backlight side. Optically anisotropic layer (A1) 6 having a light-emitting compound, vertical alignment mode liquid crystal cell 20, optically anisotropic layer (A2) 16 having a second liquid crystalline compound, and second optically anisotropic layer (C2) 13 and the second polarizer (P2) 11 in this order, and the absorption axis of the polarizer (P1) 1 and the absorption axis of the polarizer (P2) 11 are arranged orthogonally.
A liquid crystal display device 40 shown in FIG. 4B has an optional protective film 4 on the viewing side of the polarizer (P1) 1 of the liquid crystal display device shown in FIG. 4A, and the polarizer (P2). 11 has an optional protective film 14 on the backlight side. In addition, the optional protective film is provided only on either the viewing side of the polarizer (P1) 1 or the backlight side of the polarizer (P2) 11 separately from the embodiment shown in FIG. Also good.
In addition, the liquid crystal display device 40 in FIG. 4C has an arbitrary laminate film 5 on the viewing side of the protective film 4 of the liquid crystal display device shown in FIG. In this embodiment, the laminate film 15 is provided. In addition, the arbitrary laminated film may have only in any one of the visual recognition side of the protective film 4, and the backlight side of the protective film 14 separately from the aspect shown in FIG.4 (C), and protection. You may have in the aspect which does not have a film | membrane, ie, at least one of the visual recognition side of polarizer (P1) 1, and the backlight side of polarizer (P2) 11.
Moreover, in FIG. 4, the code | symbol 10 shows the visual recognition side polarizing plate, and the code | symbol 30 shows a backlight side polarizing plate.

In the liquid crystal display device according to the fourth aspect, the optically anisotropic layer (A1) and the optically anisotropic layer (A2) are all represented by the following formulas (4-1), (4-2), and (4-3). ) And the optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formulas (4-4) and (4-5).
<Optically Anisotropic Layer (A1) and Optical Anisotropic Layer (A2)>
・ 10nm ≦ Re (550) ≦ 70nm Formula (4-1)
・ 0nm ≦ Rth (550) ≦ 40nm Formula (4-2)
Re (450) / Re (550) ≦ 1.05 Formula (4-3)
<Optically Anisotropic Layer (C1) and Optical Anisotropic Layer (C2)>
・ Re (550) ≦ 30 nm (4-4)
・ 70nm ≦ Rth (550) ≦ 180nm Formula (4-5)

Here, in the fourth aspect, the optically anisotropic layer (A1) and the optically anisotropic layer (A2) are further reduced in light leakage (black luminance) generated when observed from an oblique direction. In this case, Re (550) is preferably 15 nm to 60 nm, more preferably 20 nm to 50 nm, and Rth (550) is 5 nm to 30 nm for the reason that display performance is better. The thickness is preferably 10 nm to 25 nm. Furthermore, the color change (color shift) that occurs when observed from an oblique direction is further suppressed, and even when the thickness is reduced, the display performance is better. Therefore, Re (450) / Re (550) is 1. Is preferably less than 0.0, more preferably 0.95 or less.
On the other hand, the optically anisotropic layer (C1) and the optically anisotropic layer (C2) are more suppressed in light leakage (black luminance) that occurs when observed from an oblique direction, and display performance even when the thickness is reduced. Therefore, Re (550) is preferably 20 nm or less, more preferably 10 nm or less, and Rth (550) is preferably 80 nm to 160 nm, and 90 nm to 140 nm. Is more preferable.

In the fourth embodiment, the thicknesses of the optically anisotropic layer (A1) and the optically anisotropic layer (A2) having a liquid crystal compound are both 10 μm or less, preferably 7 μm or less, More preferably, it is 5 μm or less.

[First and second modes (common)]
In the first aspect and the second aspect, light leakage (black luminance) and color change (color shift) generated when observed from an oblique direction are further suppressed, and display performance is improved even when the thickness is reduced. For reasons of good, the liquid crystalline compounds contained in the optically anisotropic layer (C1) and the optically anisotropic layer (C2) described above are both discotic liquid crystalline compounds described later, and are optically anisotropic. It is preferable that both the functional layer (C1) and the optically anisotropic layer (C2) satisfy the following formula (5), more preferably the following formula (5-1), and the following formula (5-2): It is further preferable to satisfy
0.9 <Re40 (450) / Re40 (550) ≦ 1.2 Formula (5)
0.95 <Re40 (450) / Re40 (550) ≦ 1.19 Formula (5-1)
0.99 <Re40 (450) / Re40 (550) ≦ 1.18 Formula (5-2)

In the first and second embodiments, the optically anisotropic layer (B1) and the optically anisotropic layer (B2) described above are both optically anisotropic layers including a polymer film described later. It is preferable.

[Third and fourth aspects (common)]
In the third aspect and the fourth aspect, light leakage (black luminance) and color change (color shift) generated when observed from an oblique direction are further suppressed, and display performance is improved even when the thickness is reduced. For reasons of goodness, the optically anisotropic layer (C1) and the optically anisotropic layer (C2) both contain a discotic liquid crystalline compound described later, and the optically anisotropic layer (C1) and optical The anisotropic layer (C2) preferably satisfies the following formula (5), more preferably satisfies the following formula (5-1), and further preferably satisfies the following formula (5-2).
0.9 <Re40 (450) / Re40 (550) ≦ 1.2 Formula (5)
0.95 <Re40 (450) / Re40 (550) ≦ 1.19 Formula (5-1)
0.99 <Re40 (450) / Re40 (550) ≦ 1.18 Formula (5-2)

Further, in the third and fourth aspects, the light leakage (black luminance) and the color change (color shift) that occur when observed from an oblique direction are further suppressed, and even when the display is thinned, the display performance From the reason why the liquid crystal compound contained in the optically anisotropic layer (A1) and the optically anisotropic layer (A2) is preferably a rod-like liquid crystal compound described later.
For the same reason, both the optically anisotropic layer (A1) and the optically anisotropic layer (A2) preferably satisfy the following formula (6), and more preferably satisfy the following formula (6-1). More preferably, the following formula (6-2) is satisfied.
Re (450) / Re (550) <1.0 Formula (6)
Re (450) / Re (550) <0.98 Formula (6-1)
Re (450) / Re (550) <0.96 Formula (6-2)

In the third aspect and the fourth aspect, the optically anisotropic layer (C1) and the optically anisotropic layer (C2) are optically anisotropic including a polymer film in addition to the preferred embodiment having a liquid crystalline compound. It may be a sex layer.

[First to fourth aspects (common)]
Next, the essential configuration (polarizer, optically anisotropic layer, vertical alignment mode liquid crystal cell) and optional configuration (protective film, laminate) of the liquid crystal display device according to the first to fourth embodiments of the present invention Film, alignment film, pressure-sensitive adhesive layer, etc.) will be described in detail.
In the following description, the description of the configuration that is not specified as the first aspect is a description common to the first to fourth aspects.

<Optically anisotropic layer>
{Liquid crystal compound}
The optically anisotropic layers (C1) and (C2) according to the first and second embodiments are layers having a liquid crystal compound, and preferably contain a discotic liquid crystal compound as described above.
The optically anisotropic layers (C1) and (C2) according to the third and fourth aspects are preferably layers containing a discotic liquid crystalline compound as described above.
Further, the optically anisotropic layer (A1) and the optically anisotropic layer (A2) according to the third and fourth aspects are layers having a liquid crystal compound, and contain a rod-like liquid crystal compound as described above. It is preferable.

In the present invention, various known discotic liquid crystalline compounds and rod-shaped liquid crystalline compounds can be used as the liquid crystalline compound. In the present invention, the liquid crystalline compound includes those that no longer exhibit liquid crystallinity due to polymerization or the like.

<Discotic liquid crystalline compound>
Various known compounds can be used for the discotic liquid crystalline compound used in the present invention. Examples of discotic liquid crystalline 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), Physics lett, A, 78, 82 (1990); Kohne et al., Angew. Chem. 96, page 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, 2655 (1994), azacrown type and phenylacetylene type macrocycles are included. Specifically, those described in paragraph numbers [0151] to “0168” in JP-A-2000-155216, and [0020] to [0036] in JP-A-2013-54201 can be used. .

When the discotic liquid crystalline compound is contained in the optically anisotropic layer, the optically anisotropic layer (for example, the optically anisotropic layer (C1) described above) satisfies the following formula (5) as described above. Preferably, the following formula (5-1) is satisfied, and it is more preferable that the following formula (5-2) is satisfied.
0.9 <Re40 (450) / Re40 (550) ≦ 1.2 Formula (5)
0.95 <Re40 (450) / Re40 (550) ≦ 1.19 Formula (5-1)
0.99 <Re40 (450) / Re40 (550) ≦ 1.18 Formula (5-2)

<Bar-shaped liquid crystalline compound>
Various known compounds can be used as the rod-like liquid crystal compound used in the present invention.
Examples of rod-like liquid crystalline compounds 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.
In addition, those described in [0025] to [0183] of International Publication No. 2013/018526 can be used.

When the rod-like liquid crystalline compound is contained in the optically anisotropic layer, the optically anisotropic layer (for example, the above-described optically anisotropic layer (A1)) preferably satisfies the following formula (6). It is more preferable to satisfy 6-1), and it is even more preferable to satisfy the following formula (6-2).
Re (450) / Re (550) <1.0 Formula (6)
Re (450) / Re (550) <0.98 Formula (6-1)
Re (450) / Re (550) <0.96 Formula (6-2)

<Boronic acid compound>
In the present invention, when an optically anisotropic layer containing a liquid crystalline compound is directly formed on the polarizer, in order to improve the adhesion between the polarizer and the optically anisotropic layer, the optically anisotropic layer is combined with the liquid crystalline compound. Boronic acid compounds may be used.

Examples of the boronic acid compound that can be used in the present invention represent a compound having at least one boronic acid group or a boronic ester group, and a metal complex or tetracoordinate having these as a ligand. The boron atoms having boron atoms are also represented at the same time, and those described in JP2013-05201A, paragraph numbers [0040] to [0053] can be used.

A preferable range of the content of the boronic acid compound in the optically anisotropic layer is 0.005 to in the optically anisotropic layer (in the composition before layer formation, in the total solid content excluding the solvent of the composition). The content is preferably 8% by mass, more preferably 0.01 to 5% by mass, and still more preferably 0.05 to 1% by mass.

<Optically anisotropic layer>
{Polymer film}
As described above, the optically anisotropic layer (B1) and the optically anisotropic layer (B2) according to the first and second aspects are preferably optically anisotropic layers including a polymer film.
The optically anisotropic layer (C1) and the optically anisotropic layer (C2) according to the third and fourth aspects may be optically anisotropic layers including a polymer film.

Various known polymer films can be used as the polymer film used in the present invention, and specific examples include cellulose acylate films, (meth) acrylic resin films, polyester resin films, and cycloolefin resin films. It is done.

The thickness of the polymer film is preferably 250 μm or less, more preferably 200 μm or less, and even more preferably 150 μm or less. Although a minimum is not specifically limited, Generally it is 10 micrometers or more.

In the present invention, because the durability against temperature and humidity environmental changes becomes better, it is preferable that the moisture permeability at a temperature 40 ° C. and 90% relative humidity is not more than 50g / m ² / 24h of the polymeric film, 40 g / m more preferably ² / 24h or less, and more preferably not more than 30g / m ² / 24h. Examples of the polymer film having moisture permeability satisfying this value include (meth) acrylic resin film, polyester resin film, cycloolefin resin film, and the like.

The (meth) acrylic resin is a concept including both a methacrylic resin and an acrylic resin, and includes an acrylate / methacrylate derivative, particularly an acrylate ester / methacrylate ester (co) polymer.
Further, the (meth) acrylic resin includes, in addition to the methacrylic resin and acrylic resin, a (meth) acrylic polymer having a ring structure in the main chain, a polymer having a lactone ring, and a succinic anhydride ring. A maleic anhydride-based polymer having, a polymer having a glutaric anhydride ring, and a glutarimide ring-containing polymer.

Polyester resins are preferably polyethylene terephthalate and polyethylene naphthalate.

Various known types of cycloolefin-based resin films that can be used in the present invention can be used. Specifically, those described in paragraphs [0030] to [0144] of JP-A-2006-188671 are used. be able to.

As the cellulose acylate film that can be used in the present invention, various known films can be used, and specifically those described in JP 2012-076051 A can be used.

The polymer film used in the present invention can contain various additives as required. Specific examples of the additive include an ultraviolet absorber, a plasticizer, and a matting agent fine particle, and various known ones can be used. When the polymer film of the present invention contains an additive, the total amount of the additive is preferably 5 to 50% by mass, more preferably 5 to 40% by mass with respect to the resin of the polymer film. More preferably, it is ˜30% by mass.

<Method for creating optically anisotropic layer>
The optically anisotropic layer used in the present invention can be prepared by various known methods.

{Method for producing optically anisotropic layer containing liquid crystalline compound}
The optically anisotropic layer containing the liquid crystalline compound used in the present invention is preferably formed directly on the polarizer by applying a composition containing the liquid crystalline compound to the polarizer. Here, after forming an alignment film on a polarizer, an optically anisotropic layer may be formed thereon. Also, another temporary support is prepared, an optically anisotropic layer containing a liquid crystalline compound is prepared on the temporary support, the optically anisotropic layer is peeled from the temporary support, and the polarizer and the optical anisotropy are separated. You may create by the transfer system which arrange | positions a layer through an adhesive or an adhesive agent.

By creating an optically anisotropic layer containing a liquid crystalline compound on the polarizer by coating or transferring method, the polarizer and the optically anisotropic layer are adjacent to each other, or the polarizer, alignment film, and adhesion The adhesive or the pressure-sensitive adhesive is adjacent to each other, and the alignment film, the adhesive or the pressure-sensitive adhesive and the optically anisotropic layer are adjacent to each other. With this configuration, it is possible to eliminate the support of a normal optical film containing a liquid crystal compound, which is effective for thinning the liquid crystal display device. Further, it is effective in reducing display unevenness of the liquid crystal display device caused by temperature and humidity changes.

When the liquid crystal compound is aligned and cured on the polarizer because the deterioration of the polarizer performance and wrinkles due to the high temperature of the polarizer can be reduced, the temperature during the alignment and curing is determined by the glass transition of the polarizer. It is preferable to carry out below the temperature.

{Method for producing optically anisotropic layer including polymer film}
The optically anisotropic layer containing the polymer film used in the present invention can be prepared by various known methods.

[Polarizer]
Various known polarizers can be used for the present invention. Specifically, an iodine polarizer in which iodine is adsorbed on a polyvinyl alcohol (PVA) film, a polarizer using a dichroic organic dye, and the like. Can be mentioned.

<Thickness of polarizer>
The thickness of the polarizer is preferably 25 μm or less, more preferably 20 μm or less, and even more preferably 17 μm or less. The film thickness can be controlled by a known method. For example, the film thickness can be controlled by setting the die slit width in the casting process and the stretching conditions to appropriate values.
From the viewpoint of reducing the thickness of the polarizer, a coating type polarizer in which a PVA solution is applied on a temporary support and iodine is adsorbed and stretched together with the temporary support is also preferable. The coating type polarizer can be formed, for example, by a manufacturing method using a coating method described in Japanese Patent No. 4691205 and Japanese Patent No. 4751481.

〔Protective film〕
The liquid crystal display device of the present invention may have an arbitrary protective film as shown in FIGS.
Various known protective films can be used for the present invention, and specific examples include the polymer films described above.

In order to suppress the amount of water entering the polarizing plate over time in a high-temperature and high-humidity environment and to suppress display unevenness due to warpage of the liquid crystal panel, the moisture permeability at a protective film temperature of 40 ° C. and a relative humidity of 90% is 100 g. is preferably / m ² / 24h or less, and more preferably at most 50g / m ² / 24h, more preferably at most 40g / m ² / 24h, or less 30g / m ² / 24h Is particularly preferred.
In order to lower the moisture permeability of the protective film, it is also preferable to provide a low moisture permeability layer with a member having a low moisture permeability on the polymer film. Examples of the member having low moisture permeability include a (meth) acrylic resin film, a polyester resin film, and a cycloolefin resin film.

The protective film may be further provided with a functional layer according to various purposes. Examples of the functional layer include a hard coat layer, an antiglare layer, and a low reflection layer.

〔Laminate film〕
The liquid crystal display device of the present invention may have an arbitrary laminate film as shown in FIGS.
Various known films can be used for the laminate film used in the present invention. The laminate film is disposed on the outermost surface on the viewing side and / or the backlight side of the liquid crystal display device and is peeled off during use.
When transporting the liquid crystal display device, the moisture permeability of the laminate film at a temperature of 40 ° C. and a relative humidity of 90% should be 50 g / m ² · day or less because the adverse effect of water intrusion into the liquid crystal display device can be reduced. Is preferably 40 or less, more preferably 30 or less.

[Brightness enhancement film]
The liquid crystal display device of the present invention can be used in combination with any brightness enhancement film. The brightness enhancement film has a function of separating circularly polarized light or linearly polarized light, and is disposed between the polarizing plate and the backlight, and reflects or backscatters one circularly polarized light or linearly polarized light to the backlight side. Re-reflected light from the backlight part partially changes the polarization state and partially transmits when re-entering the brightness enhancement film and the polarizing plate, so the light utilization rate is improved by repeating this process. The front luminance is improved to about 1.4 times. As the brightness enhancement film, an anisotropic reflection method and an anisotropic scattering method are known, and both can be combined with the polarizing plate used in the present invention.

In the present invention, the specifications of International Publication No. 97/32223, International Publication No. 97/32224, International Publication No. 97/32225, International Publication No. 97/32226, and Japanese Patent Application Laid-Open No. 9-274108. Used in combination with a brightness enhancement film of an anisotropic scattering method in which a positive intrinsic birefringent polymer and a negative intrinsic birefringent polymer are blended and uniaxially stretched as described in each publication of JP-A-11-174231 It is also preferable to do. As the anisotropic scattering system brightness enhancement film, DRPF-H (manufactured by 3M) is preferable.

[Liquid crystal cell]
The liquid crystal cell used in the present invention is a vertical alignment mode liquid crystal cell, and various known ones can be used.

The Δn · d of the vertical alignment mode liquid crystal cell is preferably 250 nm ≦ Δn · d ≦ 400 nm. Here, Δn represents the birefringence of the liquid crystal material used in the vertical alignment mode liquid crystal cell, and d represents the thickness of the cell liquid crystal layer.

A structure called a multi-domain in which one pixel is divided into a plurality of regions is preferable because the viewing angle characteristics in the vertical and horizontal directions are averaged and the display quality is improved.

Hereinafter, the present invention will be described in more detail based on examples. The materials, amounts used, ratios, processing details, processing procedures, and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the following examples.

[Configuration of liquid crystal display device]
The configuration of the liquid crystal display device manufactured in each example and each comparative example is the first to fourth modes shown in Table 1 below. The evaluation results in each aspect are as shown in Tables 2 to 5 below.

[First embodiment]
<Example 1-1>
[Preparation of protective film]
The following composition was put into a mixing tank and stirred while heating to dissolve each component to prepare a cellulose acetate solution (dope).
(Composition of cellulose acetate solution (dope))
――――――――――――――――――――――――――――――――――
Cellulose acetate 100 parts by mass (acetyl substitution degree 2.86, viscosity average polymerization degree 310)
-Triphenyl phosphate 8.0 parts by mass-Biphenyl diphenyl phosphate 4.0 parts by mass-Tinuvin 328 Ciba Japan 1.0 part by mass-Tinuvin 326 Ciba Japan 0.2 part by mass-Methylene chloride 369 parts by mass-Methanol 80 parts by mass, 1-butanol 4 parts by mass ――――――――――――――――――――――――――――――――――

The obtained dope was heated to 30 ° C., and cast on a mirror surface stainless steel support, which was a drum having a diameter of 3 m, through a casting Giesser. The surface temperature of the support was set to -5 ° C. The space temperature of the entire casting part was set to 15 ° C. The cellulose ester film cast and rotated 50 cm before the end point of the casting part was peeled off from the drum, and then both ends were clipped with a pin tenter. The residual solvent amount of the cellulose ester web immediately after stripping was 70%, and the film surface temperature of the cellulose ester web was 5 ° C.

The cellulose ester web held by the pin tenter was conveyed to the drying zone. In the initial drying, a drying air of 45 ° C. was blown. Next, it was dried at 110 ° C. for 5 minutes and further at 140 ° C. for 10 minutes. This was designated as a protective film 01.

The resulting thickness of the protective film 01 is 60 [mu] m, the moisture permeability was 600g / m ² / 24h. Re (550) = 1.5 nm and Rth (550) = 40 nm. The refractive index was nx = 1.48.

[Bonding of protective film and polarizer]
<Saponification of film>
The prepared protective film 01 was immersed in a 4.5 mol / L sodium hydroxide aqueous solution (saponification solution) adjusted to 37 ° C. for 1 minute, then washed with water, and then in a 0.05 mol / L sulfuric acid aqueous solution for 30 seconds. After soaking, it was further passed through a washing bath. Then, draining with an air knife was repeated three times, and after dropping water, the film was retained in a drying zone at 70 ° C. for 15 seconds and dried to produce a saponified protective film 01.
<Production of polarizer>
According to Example 1 of Japanese Patent Laid-Open No. 2001-141926, a peripheral speed difference was given between two pairs of nip rolls, and a polarizer having a width of 1330 mm and a thickness of 15 μm was prepared by stretching in the longitudinal direction. The polarizer thus produced was designated as a polarizer 1.
<Lamination>
The polarizer 1 thus obtained and the above-described saponified protective film 01 were prepared by using a PVA (manufactured by Kuraray Co., Ltd., PVA-117H) 3% aqueous solution as an adhesive, the polarizing axis and the longitudinal direction of the film A polarizing plate 01 with a single-sided protective film was produced by laminating with roll-to-roll so that the two were orthogonal to each other.

[Formation of optically anisotropic layer (B1)]
Film sample Nos. Described in Examples of JP2009-063983A. 110 and film sample no. With reference to the production method of 111, the composition, stretching method, stretching temperature and stretching ratio shown below were changed, and the film thickness was 42 μm, Re (550) = 75 nm, Rth (550) = 80 nm, Re (450 ) / Re (550) = 0.83 optically anisotropic layer (B1) was produced. The refractive index was nx = 1.48.
(Composition of cellulose acetate)
――――――――――――――――――――――――――――――――――
Cellulose acetate (acetyl substitution degree 2.94) 100 parts by mass Triphenyl phosphate 4.3 parts by mass Biphenyl diphenyl phosphate 3.0 parts by mass Retardation developer 1 (following formula) 6.0 parts by mass Retardation Expression agent 3 (following formula) 5.0 parts by mass ――――――――――――――――――――――――――――――――――
(Stretching method) Fixed end uniaxial stretching (TD direction)
(Extension temperature) 185 ° C
(Stretch ratio) 23%

[Formation of Optically Anisotropic Layer (C1) / Preparation of Viewing Side Polarizing Plate]
The following compounds 3-1 to 3-6 were mixed and dissolved in methyl ethyl ketone to prepare a coating solution for the optically anisotropic layer C1.
――――――――――――――――――――――――――――――――――
Composition of coating solution for optically anisotropic layer C1 ――――――――――――――――――――――――――――――――――
Discotic liquid crystalline compound 3-1 91.0 parts by mass Compound 3-2 9.0 parts by mass Polymerization initiator: Compound 3-3 3.0 parts by mass Polymerization initiator: Compound 3-4 1.0 Part by mass / Fluorine-containing surfactant: Compound 3-5 0.8 part by mass / Adhesion improver: Compound 3-6 0.5 part by mass / Methyl ethyl ketone 408 parts by mass ------- ―――――――――――――――――――――

The coating solution was applied to the optically anisotropic layer (B1) prepared above using a # 2.0 wire bar and dried. The discotic liquid crystalline compound was aligned by heating at 70 ° C. for 60 seconds.
Thereafter, 290 mJ / cm ² of ultraviolet light was immediately irradiated under a temperature condition of 70 ° C. to polymerize the discotic liquid crystalline compound, fix the alignment state, and form the optically anisotropic layer (C1). The thickness of the formed optically anisotropic layer (C1) was 1 μm. The thickness of the optically anisotropic layer was measured with a laser film thickness meter.
The optically anisotropic layer (C1) was formed on a glass substrate under the same conditions as in the example, and the retardation of only the optically anisotropic layer was measured. Re (550) = 0 nm, Rth (550) = Re (450) / Re (550) = 1.15 indicating wavelength dispersion at 40 nm. The refractive index was nx = 1.58.

After forming the optically anisotropic layer (C1) on the optically anisotropic layer (B1), it is bonded to the opposite side of the protective film of the polarizing plate 01 with the single-sided protective film by the same method as the protective film. A viewing side polarizing plate was prepared.

[Backlight polarizing plate]
The backlight side polarizing plate was produced by the method similar to the visual recognition side polarizing plate.

[Production of liquid crystal display device]
The polarizing plates on the front and back sides of a commercially available vertical alignment mode liquid crystal display device (UN40EH6030F, manufactured by Samsung) are peeled off so that the absorption axes of the polarizers of the viewing side polarizing plate and the backlight side polarizing plate are orthogonal to each other. By bonding, the liquid crystal display device of Example 1-1 was produced.

[Evaluation of liquid crystal display devices]
The produced liquid crystal display device was evaluated by the following method, and the results are shown in Table 2 below.
<Display performance (light leakage, color change)>
{Evaluation criteria for light leakage}
The black luminance was measured using a measuring instrument (EZ-Contrast XL88, manufactured by ELDIM) when the liquid crystal display device displayed black in a dark room. The average value of luminance at an azimuth angle of 45 °, 135 °, 225 °, and 315 ° at a polar angle of 60 ° was evaluated as light leakage Y. The absorption axis of the polarizer is arranged at an azimuth angle of 0 ° and a backlight side at an azimuth angle of 90 ° unless otherwise specified.
A: Y <0.6 (cd / m ² )
B: 0.6 (cd / m ² ) ≦ Y <0.8 (cd / m ² )
C: 0.8 (cd / m ² ) ≦ Y

{Evaluation criteria for color change}
The chromaticity was measured using a measuring instrument (EZ-Contrast XL88, manufactured by ELDIM) when the liquid crystal display device displayed black in a dark room. Specifically, chromaticities u ′ and v ′ are calculated in increments of 15 ° from an azimuth angle of 0 ° to 345 ° at a polar angle of 60 °, and minimum values (u′min and v′min) of u ′ and v ′, respectively. The maximum values (u′max, v′max) were extracted, and the color change Δu′v ′ was evaluated by the following formula.
Δu′v ′ = √ ((u′max−u′min) ² + (v′max−v′min) ² )
A: Δu′v ′ <0.1
B: 0.1 ≦ Δu′v ′ <0.14
C: 0.14 ≦ Δu′v ′

<Durability (uneven display)>
About the manufactured liquid crystal display device, the backlight of the liquid crystal display device is turned on at 25 ° C. and 60% relative humidity after thermostatting at 40 ° C. and 95% relative humidity for 24 hours. A black display screen was shot from the front of the screen with the brightness measurement camera “ProMetric” (Radian Imaging), and the light leakage was determined based on the average brightness of the entire screen and the brightness difference between the four corners where light leakage is large. And evaluated.
{Evaluation criteria for display unevenness}
A: Light leakage at the four corners of the panel is not visually recognized. (Light leakage from the panel is about the same as before the thermo was turned on.)
B: Among the four corners of the panel, slight light leakage is visible at one or two corners, but is acceptable.
C: Among the four corners of the panel, slight light leakage is visible at 3 to 4 corners, but is acceptable.
D: The light leakage at the four corners of the panel is strong and unacceptable.
Also, instead of turning on the backlight of the liquid crystal display device at 25 ° C. and 60% relative humidity for 5 hours, the backlight of the liquid crystal display device is turned on for 24 hours at 25 ° C. and 60% relative humidity after thermostating for 2 hours in the DRY environment. Although the same evaluation was performed, the evaluation results of the light leakage amount and the display unevenness were the same as those in the case of being left for 2 hours at 25 ° C. and 60% relative humidity.

<Example 1-2>
[Formation of optically anisotropic layer (B1)]
In the formation of the optically anisotropic layer (B1) of Example 1-1, the thickness and optical characteristics (Re , Rth and wavelength dispersion) were formed.

[Formation of Optically Anisotropic Layer (C1) / Preparation of Viewing Side Polarizing Plate]
An optically anisotropic layer having the thickness and optical properties (Re, Rth, and wavelength dispersion) shown in Table 2 below was used in the same manner as Example 1-1 except that the optically anisotropic layer (B1) was used. C1) was formed, and a viewing side polarizing plate was produced.

[Production and evaluation of liquid crystal display devices]
A liquid crystal display device was produced and evaluated in the same manner as in Example 1-1 except that the polarizing plate produced above was used.

<Example 1-3>
[Formation of optically anisotropic layer (B1)]
Film sample Nos. Described in Examples of JP2009-063983A. 110 and film sample no. With reference to the production method of 111, the composition, stretching method, stretching temperature, and stretching ratio shown below were changed, and the optical anisotropic layer having the thickness and optical properties (Re, Rth, and wavelength dispersion) shown in Table 2 below ( B1) was produced.
(Composition of cellulose acetate)
――――――――――――――――――――――――――――――――――
Cellulose acetate (acetyl substitution degree 2.86) 100 parts by mass Triphenyl phosphate 6.6 parts by mass Biphenyl diphenyl phosphate 4.7 parts by mass Retardation agent 1 5.0 parts by mass ―――――――――――――――――――――――――――
(Stretching method) Fixed end biaxial stretching (stretching temperature) 180 ° C
(Stretch ratio) 40%, TD direction (stretch relaxation) 45%, MD direction

[Formation of Optically Anisotropic Layer (C1) / Preparation of Viewing Side Polarizing Plate]
A coating solution for the optically anisotropic layer C1 was prepared in the same manner as in Example 1-1 except that methylethylketone was changed to 237 parts by mass in the formation of the optically anisotropic layer (C1) in Example 1-1. .
Next, the thicknesses and optical characteristics (Re, An optically anisotropic layer (C1) having Rth and wavelength dispersion) was formed to produce a viewing side polarizing plate.

<Example 1-4>
[Formation of optically anisotropic layer (B1)]
In the formation of the optically anisotropic layer (B1) of Example 1-1, Table 2 below shows the same procedure as in Example 1-1 except that the draw ratio was changed to 10% and the film thickness was changed to 70 μm. An optically anisotropic layer (B1) having the indicated thickness and optical properties (Re, Rth, and wavelength dispersion) was formed.

<Example 1-5>
[Formation of optically anisotropic layer (B1)]
In the formation of the optically anisotropic layer (B1) of Example 1-3, Table 2 below shows the same procedure as in Example 1-1 except that the draw ratio was changed to 35% and the film thickness was 89 μm. An optically anisotropic layer (B1) having the indicated thickness and optical properties (Re, Rth, and wavelength dispersion) was formed.

<Example 1-6>
[Formation of optically anisotropic layer (B1)]
<Synthesis Example 1>
(Synthesis of spiro [fluorene-9,8'-tricyclo [4.3.0.12,5] [3] decene] (endo form, see formula (A) below))

In a 1000 ml flask equipped with a dropping funnel, 15.52 g (0.0934 mol) of fluorene was weighed and the inside of the system was purged with nitrogen. To this was added 165 ml of dehydrated THF, and the mixture was stirred well with a stirrer and dissolved. Next, 117 ml of a 1.6 mol / l hexane solution of n-butyllithium was gradually added dropwise while maintaining the temperature of the reaction system at −78 ° C. in a dry ice bath. After completion of the dropping, stirring was continued for 1 hour while maintaining the reaction system at -78 ° C. In this reaction solution, 21.60 g of 2endo, 3endo-bis- (toluene-4-sulfonyloxy) -5-norbornene (endo body) represented by the following formula (B) was dissolved in 500 ml of dehydrated THF in advance. Was gradually added dropwise while maintaining the temperature of the reaction system at -78 ° C. After completion of the dropwise addition, stirring was continued for 1 hour in a dry ice bath, and then the cooling bath was removed, and stirring was continued until the reaction system completely returned to room temperature (about 3 hours). After quenching by adding saline, the reaction solution was washed three times with distilled water and dried using sodium sulfate. Thereafter, the solvent is removed by heating under reduced pressure, and the obtained crystal is recrystallized using methanol to give a spiro [fluorene-9,8′-tricyclo represented by the above formula (A) as a pale yellow crystal. 5.4.3 g of [4.3.0.12,5] [3] decene] (endo body) was obtained.

<Polymer synthesis example 1>
As a norbornene monomer (Im), spiro [fluorene-9,8′-tricyclo [4.3.0.12,5] [3] decene] represented by the structural formula (A) (endo form) 1.90 g, 8-methoxycarbonyl-8-methyltetracyclo [4.4.0.12,5.17,10] -3-dodecene represented by the following formula (C) 5.5 g, 0.391 g of 1-hexene and 16.4 g of toluene were charged into a reaction vessel purged with nitrogen and heated to 80 ° C. To this, 0.169 ml of a toluene solution of triethylaluminum (0.6 mol / L) and 0.138 ml of a toluene solution of methanol-modified WCl6 (0.025 mol / L) were added and reacted at 80 ° C. for 3 hours to open the ring. A copolymer solution was obtained. The resulting ring-opening copolymer had a weight average molecular weight (Mw) of 10.0 × 10 ⁴ and a molecular weight distribution (Mw / Mn) of 4.80.

Next, the obtained ring-opening copolymer solution was put in an autoclave, and 83.8 g of toluene was further added. A hydrogenation catalyst, RuHCl (CO) [P (C ₆ H ₅ )] _3, was added at 2500 ppm based on the monomer charge, the hydrogen gas pressure was adjusted to 9-10 MPa, and the reaction was carried out at 160-165 ° C. for 3 hours. went. After completion of the reaction, a hydrogenated product was obtained by precipitation in a large amount of methanol solution. The resulting hydrogenated ring-opening copolymer (resin (P1)) had a weight average molecular weight (Mw) = 9.15 × 10 ⁴ , a molecular weight distribution (Mw / Mn) = 3.76, an intrinsic viscosity [η ] = 0.63, and glass transition temperature (Tg) = 184.0 ° C.

Further, the proportion of the structural unit (I) derived from spiro [fluorene-9,8′-tricyclo [4.3.0.12,5] [3] decene] (endo body) in the resin (P1) is 20. The proportion of structural unit (II) derived from 6 mol%, 8-methyl-8-methoxycarbonyltetracyclo [4.4.0.12,5.17,10] -3-dodecene is 79.4 mol%. there were. As a result of analyzing the resin (P1) by 1H-NMR, the hydrogenation rate with respect to the olefinic double bond was 99% or more, and the residual rate of the aromatic ring was substantially 100%.

<Preparation of optically anisotropic layer (B1)>
A colorless and transparent cast film having a thickness of 110 μm and a solvent residual amount of 0.2% or less was obtained from the resin (P1) obtained in Synthesis Example 1 by a methylene chloride cast method. This film was heated in a tenter to 194 ° C., which is Tg + 10 ° C., stretched 70% in the TD direction and 3% in the MD direction at a stretching rate of 220% / min, cooled and taken out, and the thickness shown in Table 2 below. And an optically anisotropic layer (B1) having optical properties (Re, Rth and wavelength dispersion) were obtained. The optical characteristics were measured with a refractive index of nx = 1.52.

<Example 1-7>
[Preparation of protective film]
<Stretched PET 100 μm>
As shown below, terephthalic acid and ethylene glycol are directly reacted to distill off water, esterify, and then, using a direct esterification method in which polycondensation is performed under reduced pressure, raw polyester 1 ( Sb catalyst system PET) was obtained.

(1) Esterification reaction In a first esterification reactor, 4.7 tons of high-purity terephthalic acid and 1.8 tons of ethylene glycol are mixed over 90 minutes to form a slurry, and continuously at a flow rate of 3800 kg / h. It supplied to the 1st esterification reaction tank. Further, an ethylene glycol solution of antimony trioxide was continuously supplied, and the reaction was carried out at a reaction vessel temperature of 250 ° C. with stirring and an average residence time of about 4.3 hours. At this time, antimony trioxide was continuously added so that the amount of Sb added was 150 ppm in terms of element.

The reaction product was transferred to a second esterification reaction vessel, and reacted with stirring at a temperature in the reaction vessel of 250 ° C. and an average residence time of 1.2 hours. To the second esterification reaction tank, an ethylene glycol solution of magnesium acetate and an ethylene glycol solution of trimethyl phosphate are continuously supplied so that the added amount of Mg and the added amount of P are 65 ppm and 35 ppm in terms of element, respectively. did.

(2) the polycondensation reaction above-obtained esterification reaction product supplied to the first polycondensation reaction vessel continuously stirring, the reaction temperature 270 ° C., the reaction vessel pressure 20 torr (2.67 × 10 ^{- 3} MPa) and polycondensation with an average residence time of about 1.8 hours.

Further, it was transferred to the second double condensation reaction tank, and while stirring in this reaction tank, the reaction tank temperature was 276 ° C., the reaction tank pressure was 5 torr (6.67 × 10 ⁻⁴ MPa), and the residence time was about 1.2 hours. The reaction (polycondensation) was performed under the conditions.

Subsequently, it was further transferred to the third triple condensation reaction tank. In this reaction tank, the reaction tank temperature was 278 ° C., the reaction tank pressure was 1.5 torr (2.0 × 10 ⁻⁴ MPa), and the residence time was 1.5 hours. The reaction product (polyethylene terephthalate (PET)) was obtained by reaction (polycondensation) under the following conditions.

Next, the obtained reaction product was discharged into cold water in a strand form and immediately cut to prepare polyester pellets (cross section: major axis: about 4 mm, minor axis: about 2 mm, length: about 3 mm).
The obtained polymer had an intrinsic viscosity IV = 0.63. This polymer was designated as raw material polyester 1.
Intrinsic viscosity IV is obtained by dissolving the raw material polyester 1 in a 1,1,2,2-tetrachloroethane / phenol (= 2/3 [mass ratio]) mixed solvent, and the solution viscosity at 25 ° C. in the mixed solvent. I asked for it.

(Raw material polyester 2)
10 parts by weight of a dried UV absorber (2,2 ′-(1,4-phenylene) bis (4H-3,1-benzoxazinon-4-one), raw material polyester 1 (IV = 0.63) 90 The raw material polyester 2 containing an ultraviolet absorber was obtained by mixing the mass parts and using a kneading extruder.

(Production example)
<3-layer co-pressed PET 80 μm>
-Film forming process-
The raw material polyester 1 (90 parts by mass) and the raw material polyester 2 containing ultraviolet absorbers (10 parts by mass) are dried to a water content of 20 ppm or less and then put into the hopper 1 of a single-screw kneading extruder 1 having a diameter of 50 mm. Then, it was melted at 300 ° C. by the extruder 1 (intermediate layer II layer). Moreover, after drying the raw material polyester 1 to a water content of 20 ppm or less, it was put into a hopper 2 of a single screw kneading extruder 2 having a diameter of 30 mm and melted at 300 ° C. by the extruder 2 (outer layer I layer, outer layer III layer). .
These two kinds of polymer melts are respectively passed through a gear pump and a filter (pore diameter 20 μm), and then the polymer extruded from the extruder 1 is extruded into an intermediate layer (II layer) in a two-type three-layer confluence block. The polymer extruded from the machine 2 was laminated so as to be outer layers (I layer and III layer), and extruded from a die into a sheet.
The molten resin was extruded from the die under the conditions that the pressure fluctuation was 1% and the temperature distribution of the molten resin was 2%. Specifically, the back pressure was increased by 1% with respect to the average pressure in the barrel of the extruder, and the piping temperature of the extruder was heated at a temperature 2% higher than the average temperature in the barrel of the extruder.
The molten resin extruded from the die was extruded onto a cooling cast drum set at a temperature of 25 ° C., and was brought into close contact with the cooling cast drum using an electrostatic application method. It peeled off using the peeling roll arrange | positioned facing the cooling cast drum, and the unstretched polyester film 2 was obtained. At this time, the discharge amount of each extruder was adjusted so that the ratio of the thicknesses of the I layer, the II layer, and the III layer was 10:80:10.

The obtained unstretched polyester film 2 was horizontally stretched under the following conditions to produce a PET film having a thickness of 80 μm, an in-plane direction retardation Re of 8200 nm, and a thickness direction retardation Rth of 9400 nm.
{conditions}
-Transverse stretching temperature: 90 ° C
・ Horizontal stretch ratio: 4.3 times

(Heat fixing part)
Next, a heat setting treatment was performed while controlling the film surface temperature of the polyester film within the following range.
{conditions}
・ Heat setting temperature: 180 ℃
・ Heat setting time: 15 seconds

(Heat relaxation part)
The polyester film after heat setting was heated to the following temperature to relax the film.
{conditions}
-Thermal relaxation temperature: 170 ° C
-Thermal relaxation rate: TD direction (film width direction, lateral direction) 2%

(Cooling section)
Next, the polyester film after heat relaxation was cooled at a cooling temperature of 50 ° C.

[Bonding of protective film and polarizer]
The polyester film produced in the above production example was used as a protective film, and was bonded via a polarizer and an adhesive layer according to the following method.
The moisture permeability of the polyester film prepared was 10g / m ² / 24h. Re (550) = 8200 nm and Rth (550) = 9400 nm. The refractive index was nx = 1.48.

(Formation of polarizer-side easy adhesion layer)
(1) Synthesis of copolyester resin (A-1) ――――――――――――――――――――――――――――――――――
Dimethyl terephthalate 194.2 parts by weight Dimethyl isophthalate 184.5 parts by weight Dimethyl-5-sodium sulfoisophthalate 14.8 parts by weight Diethylene glycol 233.5 parts by weight Ethylene glycol 136.6 parts by weight Tetra-n -Butyl titanate 0.2 parts by mass ---------
The above compound was charged, and a transesterification reaction was performed at a temperature of 160 ° C. to 220 ° C. over 4 hours. Next, the temperature was raised to 255 ° C., and the pressure of the reaction system was gradually reduced, followed by reaction for 1 hour 30 minutes under a reduced pressure of 30 Pa to obtain a copolyester resin (A-1).

(2) Preparation of polyester water dispersion (Aw-1) ――――――――――――――――――――――――――――――――――
・ Copolymerized polyester resin (A-1) 30 parts by mass ・ Ethylene glycol n-butyl ether 15 parts by mass ―――――――――――――――――――――――――――― ――――――
The above compound was added and heated and stirred at 110 ° C. to dissolve the resin. After the resin was completely dissolved, 55 parts by mass of water was gradually added to the polyester solution while stirring. After the addition, the solution was cooled to room temperature while stirring to prepare a milky white polyester aqueous dispersion (Aw-1) having a solid content of 30% by mass.

(3) Preparation of aqueous polyvinyl alcohol solution (Bw-1) 90 parts by mass of water was added and 10 parts by mass of polyvinyl alcohol resin (Kuraray) (B-1) having a saponification degree of 88% and a polymerization degree of 500 with stirring. Slowly added. After the addition, the solution was heated to 95 ° C. while stirring to dissolve the resin. After dissolution, the mixture was cooled to room temperature with stirring to prepare a polyvinyl alcohol aqueous solution (Bw-1) having a solid content of 10% by mass.

(4) Preparation of block polyisocyanate aqueous dispersion (C-1) ――――――――――――――――――――――――――――――――――
-Polyisocyanate compound having an isocyanurate structure using hexamethylene diisocyanate as a raw material (manufactured by Asahi Kasei Chemicals, Duranate TPA) 100 parts by mass-55 parts by mass of propylene glycol monomethyl ether acetate-Polyethylene glycol monomethyl ether (average molecular weight 750) 30 parts by mass- ―――――――――――――――――――――――――――――――――
The above compound was charged and held at 70 ° C. for 4 hours under a nitrogen atmosphere. Thereafter, the reaction solution temperature was lowered to 50 ° C., and 47 parts by mass of methyl ethyl ketoxime was added dropwise. The infrared spectrum of the reaction solution was measured to confirm that the absorption of isocyanate groups had disappeared, and a block polyisocyanate aqueous dispersion (C-1) having a solid content of 75% by mass was obtained.

The following coating agent was mixed and the coating liquid P1 for polarizer side easy adhesion which the mass ratio of polyester-type resin (A) / polyvinyl alcohol-type resin (B) becomes 70/30 was produced.
――――――――――――――――――――――――――――――――――
・ Water 40.61 mass%
・ Isopropanol 30.00% by mass
・ Polyester water dispersion (Aw-1) 11.67% by mass
-Polyvinyl alcohol aqueous solution (Bw-1) 15.00% by mass
・ Block isocyanate-based crosslinking agent (C-1) 0.67% by mass
・ Particles (silica sol with an average particle diameter of 100 nm, solid content concentration of 40% by mass)
1.25% by mass
・ Catalyst (organotin-based compound solid content concentration 14% by mass) 0.3% by mass
・ Surfactant (silicone, solid concentration 10% by mass) 0.5% by mass
――――――――――――――――――――――――――――――――――

(Application of easy adhesion layer to polyester film)
By the reverse roll method, the coating liquid P1 for polarizer-side easy adhesion was applied to one side of the polyester film (protective film) while adjusting the coating amount after drying to be 0.12 g / m ² .

The surface of the polyester film sample coated with the coating liquid P1 for the polarizer-side easy-adhesive layer is laminated on the polarizer side by roll-to-roll, and the top of the roll is used to cure the adhesive to the obtained laminate. While being conveyed, it was heated and bonded at 70 ° C. and a relative humidity of 60%. Thus, the polarizing plate 02 with a single-sided protective film was produced.

[Production and evaluation of liquid crystal display devices]
A liquid crystal display device was prepared and evaluated in the same manner as in Example 1-1 except that the polarizing plate 02 with a single-side protective film prepared above was used.

<Example 1-8>
[Preparation of protective film]
<Thermoplastic resin film 1>

[In the above general formula (1), a (meth) acrylic resin having a lactone ring structure in which R ¹ is a hydrogen atom and R ² and R ³ are methyl groups {mass ratio of copolymerization monomer = methyl methacrylate / 2- ( Hydroxymethyl) methyl acrylate = 8/2, lactone cyclization rate about 100%, lactone ring structure content 19.4%, mass average molecular weight 133000, melt flow rate 6.5 g / 10 min (240 ° C., 10 kgf) , Tg 131 ° C.} and 90 parts by mass of a mixture of acrylonitrile-styrene (AS) resin {Toyo AS AS20, manufactured by Toyo Styrene Co., Ltd.} 10 parts by mass; Tg 127 ° C.] pellets were supplied to a twin-screw extruder and about 280 ° C. And melt extruded into a sheet to obtain a (meth) acrylic resin sheet having a lactone ring structure. A thermoplastic resin film (thickness: 40 μm, in-plane retardation Re: 0.8 nm, thickness direction retardation Rth: 1.5 nm) is obtained by stretching the unstretched sheet vertically and horizontally under a temperature condition of 160 ° C. Got.

One side of the polarizer was subjected to a corona treatment on the produced thermoplastic resin film using an acrylic adhesive, and then bonded to produce a polarizing plate 03 with a single-side protective film.

[Production and evaluation of liquid crystal display devices]
A liquid crystal display device was produced and evaluated in the same manner as in Example 1-1 except that the polarizing plate 03 with a single-side protective film produced above was used.

<Example 1-9>
[Preparation of protective film]
An imidized resin was obtained by the method described in JP2011-138119A, [0173] to [0176].
100 parts by weight of the imidized resin (III) obtained and 0.10 parts by mass of the following triazine compound A were pelletized using a single screw extruder.
Using the above pellets, an unstretched film was stretched in the longitudinal and transverse directions, and a thermoplastic resin film was produced in the same manner as in Example 1-8 except for the other conditions.

The thickness of the obtained film was 40 μm. Re = 1.0 nm and Rth = 3.0 nm.

The prepared thermoplastic resin film was subjected to corona treatment on one surface of the polarizer using an acrylic adhesive, and then bonded to prepare a polarizing plate 04 with a single-side protective film.

[Production and evaluation of liquid crystal display devices]
A liquid crystal display device was produced and evaluated in the same manner as in Example 1-1 except that the polarizing plate 04 with a single-side protective film produced above was used.

<Example 1-10>
[Preparation of protective film]
(Composition of Composition B-1)
――――――――――――――――――――――――――――――――――
A-DCP (100%):
Tricyclodecane dimethanol dimethacrylate [manufactured by Shin-Nakamura Chemical Co., Ltd.] 97.0 parts by mass, Irgacure 907 (100%): polymerization initiator [manufactured by Ciba Specialty Chemicals Co., Ltd.] 3.0 parts by mass SP-13 (leveling agent): 0.04 parts by mass · MEK (methyl ethyl ketone): 81.8 parts by mass ――――――――――――――――――――――――― ――――――――

(Preparation of base film)
The composition described below was put into a mixing tank and stirred while heating to dissolve each component to prepare a dope.

{Cellulose ester}
A cellulose ester having an acyl group total substitution degree of 2.75, an acetyl substitution degree of 0.19, a propionyl substitution degree of 2.56, and a weight average molecular weight of 200,000 was used.
This cellulose ester was synthesized as follows.
Sulfuric acid (7.8 parts by mass with respect to 100 parts by mass of cellulose) was added to cellulose as a catalyst, and carboxylic acid serving as a raw material for the acyl substituent was added to carry out an acylation reaction at 40 ° C. At this time, the substitution degree of the acetyl group and the propionyl group was adjusted by adjusting the amount of the carboxylic acid. In addition, aging was performed at 40 ° C. after acylation. Further, the low molecular weight component of this cellulose ester was removed by washing with acetone.

(Composition of dope)
――――――――――――――――――――――――――――――――――
-Cellulose ester 30.0 parts by mass-Acrylic resin 70.0 parts by mass (Dianar BR85 manufactured by Mitsubishi Rayon Co., Ltd.)
-Tinuvin 328 manufactured by Ciba Japan 1.0 parts by mass-320 parts by weight of methylene chloride-45 parts by weight of ethanol-------------- ―――――――

Using the band casting apparatus, the prepared dope was uniformly cast from a casting die onto a stainless steel endless band (casting support). When the amount of residual solvent in the dope reaches 40% by mass, it is peeled off from the casting support as a polymer film, conveyed without being actively stretched by a tenter, and dried at 130 ° C. in a drying zone. It was.
The thickness of the obtained film was 40 μm. Further, when the Re and Rth values of the obtained base film were measured by the method, Re = 1.0 nm and Rth = 5.0 nm. This film was used as a base film.

The composition B-1 was used for the base film, and was applied by a die coating method using a slot die described in Example 1 of Japanese Patent Application Laid-Open No. 2006-122889 at a conveyance speed of 30 m / min. For 150 seconds. Thereafter, using an air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) with an oxygen concentration of about 0.1% under a nitrogen purge, ultraviolet rays with an illuminance of 400 mW / cm ² and an irradiation amount of 60 mJ / cm ² are irradiated. Then, the coating layer was cured and wound up. The coating amount was adjusted so that the thickness of the coating layer was 12 μm. The obtained optical film was designated as protective film A.

<Preparation of polarizing plate>
The prepared protective film A was subjected to corona treatment on one surface of the polarizer using an acrylic adhesive, and then bonded to prepare a polarizing plate 05 with a single-side protective film.

[Production and evaluation of liquid crystal display devices]
A liquid crystal display device was produced and evaluated in the same manner as in Example 1-1 except that the polarizing plate 05 with a single-side protective film produced above was used.

(Dope preparation)
The composition described below was put into a mixing tank and stirred while heating to dissolve each component to prepare a dope.

[Optically anisotropic layer]
(Dope composition)
――――――――――――――――――――――――――――――――――
-Cellulose ester (acetyl substitution degree 2.81) 100 parts by mass-Triphenyl phosphate 6.8 parts by mass-Biphenyl diphenyl phosphate 4.9 parts by mass-Retardation developer R-1 4.0 parts by mass-Average particle size 16 nm Silica particles (aerosil R972 manufactured by Nippon Aerosil Co., Ltd.) 0.15 parts by mass, dichloromethane 429.7 parts by mass, methanol 64.2 parts by mass ―――――――――――――――――― ――――――――――――――――

(Retardation expression agent)
The retardation developer described below was used. These retardation developing agents can be obtained by a known synthesis method.

The solid content concentration of the dope (total concentration of cellulose ester, acrylic resin and retardation developer) was 19% by mass.

Using the band casting apparatus, the prepared dope was uniformly cast from a casting die to a stainless steel endless band (casting support) having a width of 2000 mm. When the amount of residual solvent in the dope reaches 40% by mass, it is peeled off from the casting support as a polymer film, conveyed without being actively stretched by a tenter, and dried at 130 ° C. in a drying zone. After that, the film thickness of the obtained unstretched film was 70 μm, and the glass transition temperature Tg was 142 ° C.
Further, casting is performed in the same manner as described above, both ends of the polymer film peeled off from the support are fixed with a tenter having a clip, stretched in the width direction (TD direction), and transported at 130 in the drying zone. The film was dried at 0 ° C. and the ears were slit to obtain a film having a width of 1500 mm. The amount of residual solvent in the polymer film when stretching with a tenter was 10% by mass. Here, the transport direction (MD direction) was slightly stretched by transport when calculated from the rotational speed of the stainless steel band and the support and the motion speed of the tenter. The temperature during stretching was 140 ° C., the stretching ratio in the MD direction was 1.02, and the stretching ratio in the TD direction was 1.30.
The thickness and optical characteristics (Re, Rth and wavelength dispersion) of the produced optically anisotropic layer are shown in Table 2 below.

[Production of viewing side polarizing plate]
A viewing-side polarizing plate was produced in the same manner as in Example 1-1, except that the optically anisotropic layer (B1) was used and the optically anisotropic layer (C1) was not formed.

[Formation of optically anisotropic layer (B1)]
In the formation of the optically anisotropic layer (B1) of Example 1-1, the following table was obtained in the same manner as in Example 1-1 except that the stretching temperature was changed to 195 ° C. and the stretching ratio was changed to 10%. An optically anisotropic layer having the thickness and optical properties (Re, Rth, and wavelength dispersion) shown in 2 was formed.

<Comparative Example 3>
[Formation of optically anisotropic layer (B1)]
In the formation of the optically anisotropic layer B1 of Example 1-3, the thickness and optical characteristics (Re, Rth) shown in Table 2 below were obtained in the same manner as in Example 1-1 except that the draw ratio was changed to 35%. And an optically anisotropic layer having wavelength dispersion).

[Formation of Optically Anisotropic Layer (C1) / Preparation of Viewing Side Polarizing Plate]
An optically anisotropic layer having the thickness and optical properties (Re, Rth, and wavelength dispersion) shown in Table 2 below was used in the same manner as Example 1-3 except that the optically anisotropic layer (B1) was used. C1) was formed, and a viewing side polarizing plate was produced.

[Production and evaluation of liquid crystal display devices]
A liquid crystal display device was produced and evaluated in the same manner as in Example 1-3 except that the polarizing plate produced above was used.

[Second embodiment]
<Example 2-1>
A polarizing plate 01 with a single-sided protective film was produced in the same manner as in Example 1-1.

[Formation of optically anisotropic layer (C1)]
Next, in the coating solution for the optically anisotropic layer (C1) prepared in Example 1-1, methyl ethyl ketone was changed to 152 parts by mass, and the polarizer-side surface of the polarizing plate 01 with the one-side protective film prepared above was subjected to # It was applied using a 2.0 wire bar and dried. The discotic liquid crystalline compound was aligned by heating at 70 ° C. for 60 seconds.
Thereafter, 290 mJ / cm ² of ultraviolet light was immediately irradiated under a temperature condition of 70 ° C. to polymerize the discotic liquid crystalline compound, fix the alignment state, and form the optically anisotropic layer (C1). The thickness of the formed optically anisotropic layer (C1) was 1 μm. The thickness of the optically anisotropic layer was measured with a laser film thickness meter.
The optically anisotropic layer (C1) was formed on a glass substrate under the same conditions as in the example, and the retardation of only the optically anisotropic layer was measured. Re (550) = 0 nm, Rth (550) = Re (450) / Re (550) = 1.15 showing wavelength dispersion at 80 nm. The refractive index was nx = 1.58.

[Formation of optically anisotropic layer (B1)]
In the formation of the optically anisotropic layer B1 of Example 1-1, the optical components shown in Table 3 below were prepared in the same manner as in Example 1-1 except that the stretching temperature was changed to 195 ° C. and the film thickness was changed to 26 μm. An optically anisotropic layer having characteristics (Re, Rth, and wavelength dispersion) was formed.

[Production of viewing side polarizing plate]
The optically anisotropic layer (B1) and the optically anisotropic layer (C1) side of the polarizing plate 01 with a single-side protective film on which the optically anisotropic layer (C1) is formed are made of PVA (manufactured by Kuraray Co., Ltd.). , PVA-117H) 3% aqueous solution was bonded as an adhesive to produce a viewing side polarizing plate.

[Production and evaluation of liquid crystal display devices]
A liquid crystal display device of Example 2-1 was produced in the same manner as in Example 1-1.
The manufactured liquid crystal display device was evaluated by the same method as in Example 1-1. The results are shown in Table 3.

<Example 2-2>
[Formation of optically anisotropic layer (C1)]
In the production of the optically anisotropic layer (C1) of Example 2-1, the thickness and optical characteristics (Re) shown in Table 3 below were obtained in the same manner as in Example 2-1, except that methyl ethyl ketone was changed to 237 parts by mass. , Rth and wavelength dispersion) were formed.

[Formation of optically anisotropic layer (B1)]
In the formation of the optically anisotropic layer (B1) of Example 1-1, the thickness and optical characteristics (Re) shown in Table 3 below were obtained in the same manner as in Example 1-1 except that the draw ratio was changed to 10%. , Rth and wavelength dispersion) were formed.

[Preparation of polarizing plate for viewing side and backlight side]
A viewing-side and backlight-side polarizing plate was produced in the same manner as in Example 2-1, except that the optically anisotropic layer (C1) and the optically anisotropic layer (B1) were used.

<Example 2-3>
[Formation of optically anisotropic layer (C1)]
In the same manner as in Example 2-2, an optically anisotropic layer (C1) having the thickness and optical characteristics (Re, Rth, and wavelength dispersion) shown in Table 3 below was formed.

[Formation of optically anisotropic layer (B1)]
In the formation of the optically anisotropic layer (B1) of Example 1-1, the thickness and optical characteristics (Re) shown in Table 3 below were the same as Example 1-1 except that the stretching temperature was changed to 175%. , Rth and wavelength dispersion) were formed.

<Example 2-4>
[Formation of optically anisotropic layer (C1)]
In the same manner as in Example 2-2, an optically anisotropic layer (C1) having the thickness and optical characteristics (Re, Rth, and wavelength dispersion) shown in Table 3 below was formed.

[Formation of optically anisotropic layer (B1)]
In the formation of the optically anisotropic layer B1 of Example 1-1, Table 3 below shows the same procedure as in Example 1-1 except that the stretching temperature was changed to 195 ° C. and the stretching ratio was changed to 10%. An optically anisotropic layer (B1) having the indicated thickness and optical properties (Re, Rth, and wavelength dispersion) was formed.

<Example 2-5>
[Formation of Optically Anisotropic Layer (C1) / Preparation of Viewing Side Polarizing Plate]
In the same manner as in Example 2-2, an optically anisotropic layer (C1) having the thickness and optical characteristics (Re, Rth, and wavelength dispersion) shown in Table 3 below was formed.

[Formation of optically anisotropic layer (B1)]
In the formation of the optically anisotropic layer (B1) of Example 1-1, the thickness and optical characteristics (Re) shown in Table 3 below were the same as Example 1-1 except that the stretching temperature was changed to 175 ° C. , Rth and wavelength dispersion) were formed.

<Example 2-6>
[Formation of Optically Anisotropic Layer (C1) / Preparation of Viewing Side Polarizing Plate]
In the same manner as in Example 2-2, an optically anisotropic layer (C1) having the thickness and optical characteristics (Re, Rth, and wavelength dispersion) shown in Table 3 below was formed.

[Formation of optically anisotropic layer (B1)]
A colorless and transparent cast film having a thickness of 70 μm and a residual solvent amount of 0.2% or less was obtained from the resin (P1) obtained in Synthesis Example 1 by a methylene chloride cast method. This film was heated in a tenter to 194 ° C., which is Tg + 10 ° C., stretched 65% in the TD direction and 3% in the MD direction at a stretching rate of 220% / min, cooled and taken out, and the thickness shown in Table 3 below. And an optically anisotropic layer (B1) having optical properties (Re, Rth and wavelength dispersion) were obtained. The optical characteristics were measured with a refractive index of nx = 1.52.

<Example 2-7>
A liquid crystal display device was produced and evaluated in the same manner as in Example 2-1, except that the polarizing plate 02 with a single-side protective film produced in Example 1-7 was used.

<Example 2-8>
A liquid crystal display device was produced and evaluated in the same manner as in Example 2-1, except that the polarizing plate 03 with a single-side protective film produced in Example 1-8 was used.

<Example 2-9>
A liquid crystal display device was produced and evaluated in the same manner as in Example 2-1, except that the polarizing plate 04 with a single-side protective film produced in Example 1-9 was used.

<Example 2-10>
A liquid crystal display device was produced and evaluated in the same manner as in Example 2-1, except that the polarizing plate 05 with a single-side protective film produced in Example 1-10 was used.

<Comparative example 4>
[Formation of optically anisotropic layer (C1)]
In the same manner as in Example 2-2, an optically anisotropic layer (C1) having the thickness and optical characteristics (Re, Rth, and wavelength dispersion) shown in Table 3 below was formed.

[Formation of optically anisotropic layer (B1)]
In the formation of the optically anisotropic layer (B1) of Example 1-1, the thickness and optical characteristics (Re, Re) shown in Table 3 below were changed except that the stretching temperature was changed to 195 ° C. and the stretching ratio was changed to 5%. An optically anisotropic layer (B1) was formed in the same manner as in Example 1-1 having Rth and wavelength dispersion.

[Formation of optically anisotropic layer (C1)]
In the same manner as in Example 2-2, an optically anisotropic layer (C1) having the thickness and optical characteristics (Re, Rth, and wavelength dispersion) shown in Table 3 below was formed.

[Formation of optically anisotropic layer (B1)]
In the formation of the optically anisotropic layer B1 of Example 1-1, the thickness and optical properties (Re, Rth) shown in Table 3 below were obtained in the same manner as in Example 1-1 except that the stretching temperature was changed to 175 ° C. And an optically anisotropic layer (B1) having a wavelength dispersion).

[Third Aspect]
<Example 3-1>
A polarizing plate 01 with a single-sided protective film was produced in the same manner as in Example 1-1.

[Formation of optically anisotropic layer (A1)]
The surface on the polarizer side of the polarizing plate 01 with a single-side protective film was subjected to a rubbing treatment in a direction orthogonal to the absorption axis of the polarizer. On the rubbing surface, the following coating liquid A for optically anisotropic layer was applied using a bar coater with a bar count of # 2.4. Next, the film was aged for 30 seconds at a film surface temperature of 60 ° C., and then immediately irradiated with ultraviolet rays of 290 mJ / cm ² using an air-cooled metal halide lamp (produced by Eye Graphics Co., Ltd.) at an air temperature of 60 ° C. And the optically anisotropic layer (A1) was formed by fixing the orientation state. In the formed optically anisotropic layer (A1), rod-like liquid crystals are horizontally aligned, and the slow axis direction is parallel to the rubbing direction, that is, the slow axis direction is perpendicular to the absorption axis direction of the polarizer. It was. At this time, the thickness of the optically anisotropic layer was 1 μm.
When the optically anisotropic layer (A1) was formed on a glass substrate under the same conditions as in the examples, and the retardation of only the optically anisotropic layer was measured, Re (550) = 90 nm, Rth (550) = Re (450) / Re (550) = 0.90 showing wavelength dispersion at 45 nm. The refractive index was nx = 1.53.

(Composition of coating liquid A for optically anisotropic layer)
──────────────────────────────────
-Compound 1 synthesized in Production Example 1 of International Publication No. 2013/018526 100 parts by mass-Photopolymerization initiator (Irgacure 907, manufactured by BASF Corp.) 3 parts by mass-Surfactant (KH-40, AGC) Seimi Chemical Co., Ltd.) 0.1 parts by mass / cyclopentanone 392 parts by mass ───────────────────────────────── ─

[Formation of Optically Anisotropic Layer (C1) / Preparation of Viewing Side Polarizing Plate]
Next, in the coating solution for the optically anisotropic layer (C1) prepared in Example 1-1, methyl ethyl ketone was changed to 211 parts by mass, and the polarization with a single-sided protective film in which the optically anisotropic layer (A1) prepared above was laminated The plate 01 was coated on the surface of the optically anisotropic layer (A1) side using a # 2.0 wire bar and dried. The discotic liquid crystalline compound was aligned by heating at 70 ° C. for 60 seconds.
Thereafter, by immediately irradiating with ultraviolet rays of 290 mJ / cm ² under a temperature condition of 70 ° C., the discotic liquid crystalline compound is polymerized, the alignment state is fixed, and the optically anisotropic layer (C1) is formed. A viewing side polarizing plate was prepared. The thickness of the formed optically anisotropic layer (C1) was 1 μm. The thickness of the optically anisotropic layer was measured with a laser film thickness meter.
The optically anisotropic layer (C1) was formed on a glass substrate under the same conditions as in the example, and the retardation of only the optically anisotropic layer was measured. Re (550) = 0 nm, Rth (550) = Re (450) / Re (550) = 1.15 showing wavelength dispersion at 65 nm. The refractive index was nx = 1.58.

[Production and evaluation of liquid crystal display devices]
A liquid crystal display device of Example 3-1 was produced in the same manner as in Example 1-1.
The manufactured liquid crystal display device was evaluated by the same method as in Example 1-1. The results are shown in Table 4.

<Example 3-2>
[Formation of optically anisotropic layer (A1)]
In the production of the optically anisotropic layer (A1) of Example 3-1, the thickness and optical properties (Re) shown in Table 4 below were the same as Example 3-1, except that methyl ethyl ketone was changed to 454 parts by mass. , Rth and wavelength dispersion) were formed.

[Formation of optically anisotropic layer (C1)]
In the production of the optically anisotropic layer (C1) of Example 3-1, the thickness and optical properties shown in Table 4 below (Re,) were the same as in Example 3-1, except that methyl ethyl ketone was changed to 169 parts by mass. An optically anisotropic layer (C1) having Rth and wavelength dispersion was produced.

[Preparation of polarizing plate for viewing side and backlight side]
A viewing-side and backlight-side polarizing plate was produced in the same manner as in Example 3-1, except that the optically anisotropic layer (A1) and the optically anisotropic layer (C1) were used.

[Formation of optically anisotropic layer (A1)]
In the production of the optically anisotropic layer (A1) of Example 3-1, the thickness and optical properties (Re) shown in Table 4 below were the same as in Example 3-1, except that methyl ethyl ketone was changed to 343 parts by mass. , Rth and wavelength dispersion) were formed.

[Formation of optically anisotropic layer (C1)]
In the production of the optically anisotropic layer (C1) of Example 3-1, the thickness and optical characteristics (Re) shown in Table 4 below were obtained in the same manner as in Example 3-1, except that methyl ethyl ketone was changed to 268 parts by mass. , Rth and wavelength dispersion) were produced.

<Example 3-4>
[Formation of optically anisotropic layer (A1)]
In the production of the optically anisotropic layer (A1) of Example 3-1, the thickness and optical characteristics (Re) shown in Table 4 below were obtained in the same manner as in Example 3-1, except that methyl ethyl ketone was changed to 534 parts by mass. , Rth and wavelength dispersion) were formed.

[Formation of optically anisotropic layer (C1)]
In the production of the optically anisotropic layers C1 and C2 of Example 3-1, the thicknesses and optical characteristics (Re) shown in Table 4 below were the same as in Example 3-1, except that methyl ethyl ketone was changed to 136 parts by mass. , Rth and wavelength dispersion) were produced.

<Example 3-5>
[Formation of optically anisotropic layer (A1)]
In the production of the optically anisotropic layer (A1) of Example 3-1, the thickness and optical characteristics (Re) shown in Table 4 below were the same as in Example 3-1, except that methyl ethyl ketone was changed to 302 parts by mass. , Rth and wavelength dispersion) were formed.

[Formation of optically anisotropic layer (C1)]
In the production of the optically anisotropic layer (C1) of Example 3-1, the thickness and optical properties (Re) shown in Table 4 below were obtained in the same manner as in Example 3-1, except that methyl ethyl ketone was changed to 315 parts by mass. , Rth and wavelength dispersion) were produced.

<Example 3-6>
[Formation of optically anisotropic layer (A1)]
In the same manner as in Example 3-1, an optically anisotropic layer (A1) having the thickness and optical characteristics (Re, Rth, and wavelength dispersion) shown in Table 4 below was formed.

[Formation of optically anisotropic layer (C1)]
The pellets of ZEONOR 1430R (norbornene-based ring-opening polymer hydride, manufactured by Nippon Zeon Co., Ltd., Tg 138 ° C.) were converted to a temperature of 240 ° C. with a single screw extruder (Mitsubishi Heavy Industries, Ltd .: cylinder inner diameter 90 mm, screw L / D 25). And a transparent resin having a thickness of 25 μm was obtained. Next, it is sequentially fed into a zone-heated longitudinal uniaxial (MD) stretching apparatus and tenter stretching (transverse uniaxial (TD) stretching) apparatus to perform sequential biaxial stretching, and the thickness and optical properties (Re, Rth and wavelength dispersion shown in Table 4 below) An optically anisotropic layer (C1) having () was obtained. The stretching temperature was 140 ° C. for both longitudinal stretching and lateral stretching, and the stretching ratio was 30% in the MD direction and 30% in the TD direction. The optical characteristics were measured with a refractive index of nx = 1.52.

<Example 3-7>
A liquid crystal display device was produced and evaluated in the same manner as in Example 3-1, except that the polarizing plate with a single-side protective film produced in Example 1-7 was used.

<Example 3-8>
A liquid crystal display device was produced and evaluated in the same manner as in Example 3-1, except that the polarizing plate 03 with a single-side protective film produced in Example 1-8 was used.

<Example 3-9>
A liquid crystal display device was produced and evaluated in the same manner as in Example 3-1, except that the polarizing plate 04 with a single-side protective film produced in Example 1-9 was used.

<Example 3-10>
A liquid crystal display device was produced and evaluated in the same manner as in Example 3-1, except that the polarizing plate 05 with a single-side protective film produced in Example 1-10 was used.

<Comparative Example 6>
[Formation of optically anisotropic layer (A1)]
In the production of the optically anisotropic layer (A1) of Example 3-1, the thickness and optical characteristics shown in Table 4 below were obtained in the same manner as in Example 3-1, except that the wire bar was changed to # 2.0. An optically anisotropic layer (A1) having (Re, Rth and wavelength dispersion) was formed.

[Formation of optically anisotropic layer (C1)]
In the production of the optically anisotropic layer (C1) of Example 3-1, the thickness and optical characteristics shown in Table 4 below (except that methylethylketone was changed to 306 parts by mass and changed to # 4.4 wire bar) ( An optically anisotropic layer (C1) was produced in the same manner as in Example 3-1, which had Re, Rth and wavelength dispersion.

<Comparative Example 7>
[Formation of optically anisotropic layer (A1)]
In the production of the optically anisotropic layer (A1) of Example 3-1, the thickness and optical properties (Re) shown in Table 4 below were the same as Example 3-1, except that methyl ethyl ketone was changed to 227 parts by mass. , Rth and wavelength dispersion) were formed.

[Formation of optically anisotropic layer (C1)]
In the production of the optically anisotropic layer (C1) of Example 3-1, the thickness and optical properties shown in Table 4 below were changed except that methyl ethyl ketone was changed to 716 parts by mass and changed to a wire bar of # 1.2 ( An optically anisotropic layer was produced in the same manner as Example 3-1 having Re, Rth, and wavelength dispersion.

[Fourth aspect]
<Example 4-1>
A polarizing plate 01 with a single-sided protective film was produced in the same manner as in Example 1-1.

[Formation of optically anisotropic layer (C1)]
The following compounds were mixed and dissolved to prepare a coating solution C for retardation layer.

──────────────────────────────────
Composition of coating liquid C for optically anisotropic layer ──────────────────────────────────
-Discotic liquid crystalline compound 1 72 parts by mass-Discotic liquid crystalline compound 2 18 parts by mass-Polymeric compound 10 parts by mass-Photopolymerization initiator 2 3.0 parts by mass (Irgacure 184, manufactured by BASF Corporation)
・ Fluorine-containing compound C 0.8 parts by mass ・ Adhesion improver 2 0.5 parts by mass ・ Methyl ethyl ketone 140 parts by mass───────────────────────── ─────────

Discotic liquid crystalline compound 1

Discotic liquid crystalline compound 2

Polymerizable compound

Fluorine-containing compound C

Adhesion improver 2

Next, the coating liquid C of the optically anisotropic layer (C1) prepared above was applied to the polarizer-side surface of the produced polarizing plate 01 with a single-side protective film using a # 2.0 wire bar, Dried. The discotic liquid crystalline compound was aligned by heating at 70 ° C. for 90 seconds.
Thereafter, 290 mJ / cm ² of ultraviolet light was immediately irradiated under a temperature condition of 70 ° C. to polymerize the discotic liquid crystalline compound, fix the alignment state, and form the optically anisotropic layer (C1). The thickness of the formed optically anisotropic layer (C1) was 1 μm. The thickness of the optically anisotropic layer was measured with a laser film thickness meter.
The optically anisotropic layer (C1) was formed on a glass substrate under the same conditions as in the example, and the retardation of only the optically anisotropic layer was measured. Re (550) = 0 nm, Rth (550) = Re (450) / Re (550) = 1.09 showing wavelength dispersion at 125 nm. The refractive index was nx = 1.58.

[Formation of optically anisotropic layer (A1)]
Next, the surface of the optically anisotropic layer (C1) was rubbed in a direction orthogonal to the absorption axis of the polarizer. On the rubbing-treated surface, the methyl ethyl ketone of the coating solution A for optically anisotropic layer prepared in Example 3-1 was changed to 640 parts by mass, and coating was performed using a bar coater of bar number # 2.0. Next, the film was aged for 30 seconds at a film surface temperature of 110 ° C., and then immediately irradiated with ultraviolet rays of 290 mJ / cm ² using an air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) at a film surface temperature of 60 ° C. And the visual recognition side polarizing plate was produced by forming the optically anisotropic layer (A1) by fixing the orientation state.
In the formed optically anisotropic layer (A1), rod-like liquid crystals are horizontally aligned, and the slow axis direction is parallel to the rubbing direction, that is, the slow axis direction is perpendicular to the absorption axis direction of the polarizer. It was. At this time, the thickness of the optically anisotropic layer was 1 μm.
When the optically anisotropic layer (A1) was formed on a glass substrate under the same conditions as in the examples, and the retardation of only the optically anisotropic layer was measured, Re (550) = 30 nm, Rth (550) = Re (450) / Re (550) = 0.90 showing wavelength dispersion at 15 nm. The refractive index was nx = 1.48.

[Production and evaluation of liquid crystal display devices]
A liquid crystal display device of Example 4-1 was produced in the same manner as in Example 1-1.
The manufactured liquid crystal display device was evaluated by the same method as in Example 1-1. The results are shown in Table 5.

<Example 4-2>
[Formation of optically anisotropic layer (C1)]
In the production of the optically anisotropic layer (C1) of Example 4-1, the thickness and optical properties (Re, Re) shown in Table 5 below were the same as in Example 4-1, except that methyl ethyl ketone was changed to 122 parts by mass. An optically anisotropic layer (C1) having Rth and wavelength dispersion was formed.

[Formation of optically anisotropic layer (A1)]
In the production of the optically anisotropic layer (A1) of Example 4-1, in the same manner as in Example 4-1, except that methyl ethyl ketone was changed to 566 parts by mass and the wire bar was changed to # 1.2. An optically anisotropic layer (A1) having the thickness and optical properties (Re, Rth, and wavelength dispersion) shown in Table 5 below was produced.

[Preparation of polarizing plate for viewing side and backlight side]
A viewing-side and backlight-side polarizing plate was produced in the same manner as in Example 4-1, except that the optically anisotropic layer (C1) and the optically anisotropic layer (A1) were used.

<Example 4-3>
[Formation of optically anisotropic layer (C1)]
In the production of the optically anisotropic layer (C1) of Example 4-1, the thickness and optical properties (Re) shown in Table 5 below were obtained in the same manner as in Example 4-1, except that methyl ethyl ketone was changed to 162 parts by mass. , Rth and wavelength dispersion) were formed.

[Formation of optically anisotropic layer (A1)]
In the production of the optically anisotropic layer (A1) of Example 4-1, the same procedure as in Example 4-1, except that methyl ethyl ketone was changed to 454 parts by mass and changed to a wire bar of # 2.0. An optically anisotropic layer (A1) having the thickness and optical properties (Re, Rth, and wavelength dispersion) shown in Table 5 was produced.

<Example 4-4>
[Formation of optically anisotropic layer (C1)]
In the production of the optically anisotropic layer (C1) of Example 4-1, the thickness and optical properties (Re, Re) shown in Table 5 below were the same as in Example 4-1, except that methyl ethyl ketone was changed to 218 parts by mass. An optically anisotropic layer (C1) having Rth and wavelength dispersion was formed.

[Formation of optically anisotropic layer (A1)]
In the production of the optically anisotropic layer (A1) of Example 4-1, in the same manner as in Example 4-1, except that methyl ethyl ketone was changed to 343 parts by mass and changed to a wire bar of # 2.0. An optically anisotropic layer (A1) having the thickness and optical properties (Re, Rth, and wavelength dispersion) shown in Table 5 below was produced.

<Example 4-5>
[Formation of optically anisotropic layer (C1)]
The pellets of ZEONOR 1430R (norbornene-based ring-opening polymer hydride, manufactured by Nippon Zeon Co., Ltd., Tg 138 ° C.) were converted to a temperature of 240 ° C. with a single screw extruder (Mitsubishi Heavy Industries, Ltd .: cylinder inner diameter 90 mm, screw L / D 25). And a transparent resin having a thickness of 45 μm was obtained. Next, it is sequentially fed into a zone-heated longitudinal uniaxial (MD) stretching apparatus and tenter stretching (transverse uniaxial (TD) stretching) apparatus to perform sequential biaxial stretching, and the thickness and optical properties (Re, Rth and wavelength dispersion shown in Table 5 below) An optically anisotropic layer (C1) having () was obtained. The stretching temperature was 140 ° C. for both longitudinal stretching and lateral stretching, and the stretching ratio was 30% in the MD direction and 30% in the TD direction. The optical characteristics were measured with a refractive index of nx = 1.52.

[Formation of optically anisotropic layer (A1)]
In the same manner as in Example 4-1, an optically anisotropic layer having the thickness and optical properties (Re, Rth, and wavelength dispersion) shown in Table 5 below was produced.

<Example 4-6>
A liquid crystal display device was produced and evaluated in the same manner as in Example 4-1, except that the polarizing plate 02 with a single-side protective film produced in Example 1-7 was used.

<Example 4-7>
A liquid crystal display device was produced and evaluated in the same manner as in Example 4-1, except that the polarizing plate 03 with a single-side protective film produced in Example 1-8 was used.

<Example 4-8>
A liquid crystal display device was produced and evaluated in the same manner as in Example 4-1, except that the polarizing plate 04 with a single-side protective film produced in Example 1-9 was used.

<Example 4-9>
A liquid crystal display device was produced and evaluated in the same manner as in Example 4-1, except that the polarizing plate 05 with a single-side protective film produced in Example 1-10 was used.

<Comparative Example 6>
[Formation of optically anisotropic layer (C1)]
In the production of the optically anisotropic layer (C1) of Example 4-1, the thickness and optical characteristics (Re) shown in Table 5 below were obtained in the same manner as in Example 4-1, except that methyl ethyl ketone was changed to 88 parts by mass. , Rth and wavelength dispersion) were formed.

[Formation of optically anisotropic layer (A1)]
In the production of the optically anisotropic layer (A1) of Example 4-1, the same procedure as in Example 4-1, except that methyl ethyl ketone was changed to 1569 parts by mass and the wire bar was changed to # 1.2. An optically anisotropic layer (A1) having the thickness and optical properties (Re, Rth, and wavelength dispersion) shown in Table 5 was produced.

<Comparative Example 7>
[Formation of optically anisotropic layer (C1)]
In the production of the optically anisotropic layer (C1) of Example 4-1, the thickness and optical properties (Re, Rth) shown in Table 5 below were obtained in the same manner as in Example 4-1, except that methyl ethyl ketone was changed to 333 parts by mass. And an optically anisotropic layer (C1) having a wavelength dispersion).

[Formation of optically anisotropic layer (A1)]
In the production of the optically anisotropic layer (A1) of Example 4-1, the following table was obtained in the same manner as in Example 4-1, except that methyl ethyl ketone was changed to 491 parts by mass and changed to a wire bar of # 4.0. An optically anisotropic layer (A1) having the thickness and optical properties (Re, Rth, and wavelength dispersion) shown in 5 was produced.

From the results shown in Tables 2 to 5, the vertical alignment mode liquid crystal cell was optically compensated with two optically anisotropic layers (one on the viewing side and one on the backlight side) having optical characteristics satisfying a predetermined relational expression. Even when the liquid crystal display device is thinned by optically compensating each of the viewing side polarizer and the backlight side polarizer with an optically anisotropic layer having optical properties satisfying a predetermined relational expression. It was found that the display performance was excellent and the durability against changes in the temperature and humidity environment was excellent (Example 1-1 to Example 1-10, Example 2-1 to Example 2-10, Example 3-1 to Example 3-1) Example 3-10, Example 4-1 to Example 4-9).
In particular, when the moisture permeability of the protective film is not more than 100g / m ² / 24h, display unevenness is further reduced, the durability was found to be further improved (Example 1-7 to Example 1-10 Example 2-7 to Example 2-10, Example 3-7 to Example 3-10, Example 4-6 to Example 4-9).

1 Polarizer (P1)
2 Optically anisotropic layer (B1)
3 Optically anisotropic layer (C1)
4,14

Protective film

5,15 Laminate film 6 Optically anisotropic layer (A1)
10 viewing side polarizing plate 11 polarizer (P2)
12 Optically anisotropic layer (B2)
13 Optically anisotropic layer (C2)
16 Optically anisotropic layer (A2)
20 Vertical alignment mode liquid crystal cell 30 Backlight side polarizing plate 40 Liquid crystal display device

Claims

In the direction from the viewer side to the backlight side, the first polarizer (P1), the first optically anisotropic layer (B1), the optically anisotropic layer (C1) having the first liquid crystalline compound, vertical alignment It has a mode liquid crystal cell, an optically anisotropic layer (C2) having a second liquid crystalline compound, a second optically anisotropic layer (B2), and a second polarizer (P2) in this order,
The polarizer (P1) and the polarizer (P2) are arranged with their respective absorption axes orthogonal to each other,
The thickness of the optically anisotropic layer (C1) and the optically anisotropic layer (C2) are both 10 μm or less,
The optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formulas (1-1) and (1-2),
Re (550) ≦ 30 nm Formula (1-1)
10 nm ≦ Rth (550) ≦ 100 nm Formula (1-2)
The optically anisotropic layer (B1) and the optically anisotropic layer (B2) are all represented by the following formulas (1-3), (1-4), (1-5), (1-6) and ( A liquid crystal display device satisfying 1-7).
20 nm ≦ Re (550) ≦ 160 nm Formula (1-3)
20 nm ≦ Rth (550) ≦ 160 nm Formula (1-4)
Rth (550) ≧ (−9) × Re (550) +400 nm Formula (1-5)
Rth (550) ≦ (−9/5) × Re (550) +310 nm Formula (1-6)
Re (450) / Re (550) ≦ 1.05 Formula (1-7)
However, Re (λ) represents in-plane retardation at a wavelength λnm, and Rth (λ) represents retardation in the thickness direction at a wavelength λnm.
In the direction from the viewer side to the backlight side, the first polarizer (P1), the optically anisotropic layer (C1) having the first liquid crystalline compound, the first optically anisotropic layer (B1), and the vertical alignment A mode liquid crystal cell, a second optically anisotropic layer (B2), an optically anisotropic layer (C2) having a second liquid crystalline compound, and a second polarizer (P2) in this order;
The polarizer (P1) and the polarizer (P2) are arranged with their respective absorption axes orthogonal to each other,
The thickness of the optically anisotropic layer (C1) and the optically anisotropic layer (C2) are both 10 μm or less,
The optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formulas (2-1) and (2-2),
Re (550) ≦ 30 nm Formula (2-1)
30 nm ≦ Rth (550) ≦ 120 nm Formula (2-2)
The liquid crystal display device in which the optically anisotropic layer (B1) and the optically anisotropic layer (B2) all satisfy the following formulas (2-3), (2-4), and (2-5).
15 nm ≦ Re (550) ≦ 70 nm Formula (2-3)
20 nm ≦ Rth (550) ≦ 120 nm Formula (2-4)
Re (450) / Re (550) ≦ 1.1 Formula (2-5)
However, Re (λ) represents in-plane retardation at a wavelength λnm, and Rth (λ) represents retardation in the thickness direction at a wavelength λnm.
In the direction from the viewing side to the backlight side, the first polarizer (P1), the optically anisotropic layer (A1) having the first liquid crystalline compound, the first optically anisotropic layer (C1), and the vertical alignment A mode liquid crystal cell, a second optically anisotropic layer (C2), an optically anisotropic layer (A2) having a second liquid crystalline compound, and a second polarizer (P2) in this order;
The polarizer (P1) and the polarizer (P2) are arranged with their respective absorption axes orthogonal to each other,
The thickness of the optically anisotropic layer (A1) and the optically anisotropic layer (A2) are both 10 μm or less,
The optically anisotropic layer (A1) and the optically anisotropic layer (A2) all satisfy the following formulas (3-1), (3-2) and (3-3),
50 nm ≦ Re (550) ≦ 130 Formula (3-1)
20 nm ≦ Rth (550) ≦ 70 Formula (3-2)
Re (450) / Re (550) ≦ 1.05 Formula (3-3)
The liquid crystal display device in which the optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formulas (3-4) and (3-5).
Re (550) ≦ 30 nm Formula (3-4)
20 nm ≦ Rth (550) ≦ 120 Formula (3-5)
However, Re (λ) represents in-plane retardation at a wavelength λnm, and Rth (λ) represents retardation in the thickness direction at a wavelength λnm.
In the direction from the viewer side to the backlight side, the first polarizer (P1), the first optical anisotropic layer (C1), the optical anisotropic layer (A1) having the first liquid crystalline compound, vertical alignment It has a mode liquid crystal cell, an optically anisotropic layer (A2) having a second liquid crystalline compound, a second optically anisotropic layer (C2), and a second polarizer (P2) in this order,
The polarizer (P1) and the polarizer (P2) are arranged with their respective absorption axes orthogonal to each other,
The thickness of the optically anisotropic layer (A1) and the optically anisotropic layer (A2) are both 10 μm or less,
The optically anisotropic layer (A1) and the optically anisotropic layer (A2) all satisfy the following formulas (4-1), (4-2), and (4-3):
10 nm ≦ Re (550) ≦ 70 nm Formula (4-1)
0 nm ≦ Rth (550) ≦ 40 nm Formula (4-2)
Re (450) / Re (550) ≦ 1.05 Formula (4-3)
The liquid crystal display device in which the optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formulas (4-4) and (4-5).
Re (550) ≦ 30 nm Formula (4-4)
70 nm ≦ Rth (550) ≦ 180 nm Formula (4-5)
However, Re (λ) represents in-plane retardation at a wavelength λnm, and Rth (λ) represents retardation in the thickness direction at a wavelength λnm.
The liquid crystalline compounds contained in the optically anisotropic layer (C1) and the optically anisotropic layer (C2) are both discotic liquid crystalline compounds,
The liquid crystal display device according to claim 1, wherein each of the optically anisotropic layer (C1) and the optically anisotropic layer (C2) satisfies the following formula (5).
0.9 <Re40 (450) / Re40 (550) ≦ 1.2 Formula (5)
However, Re40 (λ) represents retardation measured from a polar angle of 40 ° at a wavelength of λnm.
The optically anisotropic layer (C1) and the optically anisotropic layer (C2) both contain a discotic liquid crystalline compound,
The liquid crystal display device according to claim 3, wherein the optically anisotropic layer (C1) and the optically anisotropic layer (C2) both satisfy the following formula (5).
0.9 <Re40 (450) / Re40 (550) ≦ 1.2 Formula (5)
However, Re40 (λ) represents retardation measured from a polar angle of 40 ° at a wavelength of λnm.
The liquid crystal compound contained in the optically anisotropic layer (A1) and the optically anisotropic layer (A2) is a rod-like liquid crystal compound, according to any one of claims 3, 4, and 6. The liquid crystal display device described.
The liquid crystal display device according to claim 7, wherein the optically anisotropic layer (A1) and the optically anisotropic layer (A2) both satisfy the following formula (6).
Re (450) / Re (550) <1.0 Formula (6)
However, Re (λ) represents in-plane retardation at a wavelength λnm.
The polarizer (P1) and the optically anisotropic layer (C1) are adjacent to each other, and the polarizer (P2) and the optically anisotropic layer (C2) are adjacent to each other. Liquid crystal display device.
The polarizer (P1) and the optically anisotropic layer (A1) are adjacent to each other, and the polarizer (P2) and the optically anisotropic layer (A2) are adjacent to each other. Liquid crystal display device.
The polarizer (P1) and the optically anisotropic layer (C1) are stacked via an alignment film, and the polarizer (P2) and the optically anisotropic layer (C2) are stacked via an alignment film. The liquid crystal display device according to claim 2.
The polarizer (P1) and the optically anisotropic layer (A1) are stacked via an alignment film, and the polarizer (P2) and the optically anisotropic layer (A2) are stacked via an alignment film. The liquid crystal display device according to claim 3.
The polarizer (P1) and the optically anisotropic layer (C1) are laminated via an adhesive layer or an adhesive layer, and the polarizer (P2) and the optically anisotropic layer (C2) are bonded. The liquid crystal display device according to claim 2, wherein the liquid crystal display device is laminated via an agent layer or an adhesive layer.
The polarizer (P1) and the optically anisotropic layer (A1) are laminated via an adhesive layer or an adhesive layer, and the polarizer (P2) and the optically anisotropic layer (A2) are bonded. The liquid crystal display device according to claim 3, wherein the liquid crystal display device is laminated via an agent layer or an adhesive layer.
Having a protective film on one or both of the viewing side of the polarizer (P1) and the backlight side of the polarizer (P2);
The moisture permeability of the protective film is not more than 100g / m 2 / 24h, a liquid crystal display device according to any one of claims 1 to 14.
The optically anisotropic layer (A1), the optically anisotropic layer (A2), the optically anisotropic layer (B1), the optically anisotropic layer (B2), the optically anisotropic layer (C1), The moisture permeability of at least one optically anisotropic layer selected from the group consisting of the optically anisotropic layer (C2) is 50 g / m 2 / 24h or less. The liquid crystal display device according to item.
A laminated film on one or both of the viewing side of the polarizer (P1) and the backlight side of the polarizer (P2);
The moisture permeability of the laminated film is not more than 30g / m 2 / 24h, a liquid crystal display device according to any one of claims 1 to 14.
The liquid crystal display device according to any one of claims 1 to 17, wherein a thickness of at least one of the polarizer (P1) and the polarizer (P2) is 25 μm or less.