WO2014157081A1

WO2014157081A1 - Retarder, circular polarizer, and 3d-image display device

Info

Publication number: WO2014157081A1
Application number: PCT/JP2014/058077
Authority: WO
Inventors: 市橋　光芳; 齊藤　之人; 佐藤　寛
Original assignee: 富士フイルム株式会社
Priority date: 2013-03-25
Filing date: 2014-03-24
Publication date: 2014-10-02

Abstract

The purpose of the present invention is to provide the following: a retarder that, when affixed to a display device as a circular polarizer, sufficiently prevents color shifting upon head tilting; a circular polarizer; and a 3D-image display device. This retarder has, at least, a patterned optically anisotropic layer that contains first retardation regions and second retardation regions that have different in-plane slow axes, said first and second retardation regions being laid out so as to alternate in-plane. The patterned optically anisotropic layer comprises a first patterned optically anisotropic layer and a second patterned optically anisotropic layer laminated together. The in-plane slow axis of the first patterned optically anisotropic layer and the in-plane slow axis of the second patterned optically anisotropic layer exhibit a given relationship.

Description

Retardation plate, circularly polarizing plate, 3D image display device

The present invention relates to a retardation plate (optical film), and more particularly to a retardation plate having a patterned optical anisotropic layer containing a twisted liquid crystal compound.
Moreover, this invention relates to the circularly-polarizing plate or 3D image display apparatus which has the said phase difference plate.

In a 3D image display device that displays a stereoscopic image, an optical device that converts linearly polarized light into circularly polarized light in order to prevent deterioration of display characteristics with respect to face rotation or to separate a right eye image and a left eye image. A member may be used.
As such an optical member, for example, a so-called λ / 4 plate formed by using a liquid crystalline compound, or a pattern phase difference in which regions having different slow axes and retardations are regularly arranged in a plane. A plate is used (see, for example, Patent Document 1).

JP 2012-73515 A

On the other hand, in recent years, there has been a demand for further improvement in image quality in display devices represented by 3D image display devices.
The inventors of the present invention produced a circularly polarizing plate using the retardation plate disclosed in Patent Document 1 and pasted it on a display device to evaluate the performance of a 3D image. It has been found that is not sufficiently suppressed. More specifically, when a viewer tilts his / her face when viewing a 3D image display device with a retardation plate attached (hereinafter also referred to as “face tilt”), other colors are mixed with white. There was a problem that color (color tint) was likely to occur.

In view of the above circumstances, an object of the present invention is to provide a phase difference plate in which coloring when a face is inclined is sufficiently suppressed when it is attached to a display device as a circularly polarizing plate.
Another object of the present invention is to provide a circularly polarizing plate and a 3D image display device having the retardation plate.

As a result of intensive studies on the problems of the prior art, the present inventors have found that the above problem can be solved by using a patterned optically anisotropic layer containing a twisted liquid crystal compound.
That is, it has been found that the above object can be achieved by the following configuration.

(1) A pattern including a first phase difference region and a second phase difference region whose in-plane slow axis directions are different from each other, and the first phase difference region and the second phase difference region are alternately arranged in the plane. A retardation plate having at least an optically anisotropic layer,
The pattern optical anisotropic layer is a layer in which a first pattern optical anisotropic layer and a second pattern optical anisotropic layer are laminated,
The in-plane slow axis on the surface opposite to the second pattern optical anisotropic layer side in the first retardation region of the first pattern optical anisotropic layer, and the second of the first pattern optical anisotropic layer The in-plane slow axis on the surface opposite to the second pattern optically anisotropic layer side in the retardation region is orthogonal to the surface,
The first pattern optical anisotropic layer and the second pattern optical anisotropic layer include a twist-aligned liquid crystal compound having a thickness direction as a helical axis,
The twist direction of the liquid crystal compound in the first retardation region and the second retardation region in the first pattern optical anisotropic layer, and the first retardation region and the second retardation region in the second pattern optical anisotropic layer The twist direction of the liquid crystal compound in the same direction,
The twist angle of the liquid crystal compound in the first pattern optically anisotropic layer is 26.5 ± 10.0 °,
The twist angle of the liquid crystal compound in the second patterned optically anisotropic layer is 78.6 ± 10.0 °;
In the first retardation region and the second retardation region, an in-plane slow axis on the surface of the first pattern optical anisotropic layer on the second pattern optical anisotropic layer side, and the second pattern optical anisotropic layer In parallel with the in-plane slow axis on the surface of the first pattern optically anisotropic layer side of
The value of the product Δn1 · d1 of the refractive index anisotropy Δn1 of the first pattern optical anisotropic layer measured at a wavelength of 550 nm and the thickness d1 of the first pattern optical anisotropic layer, and the second pattern measured at a wavelength of 550 nm The value of the product Δn2 · d2 of the refractive index anisotropy Δn2 of the optically anisotropic layer and the thickness d2 of the second pattern optically anisotropic layer satisfies the following expressions (1) and (2), respectively. Phase difference plate.
Formula (1) 252 nm ≦ Δn1 · d1 ≦ 312 nm
Formula (2) 110 nm ≦ Δn 2 · d 2 ≦ 170 nm

(2) The retardation plate according to (1), wherein the liquid crystal compound is a discotic liquid crystal compound or a rod-like liquid crystal compound.
(3) The phase difference plate according to (1) or (2), wherein the first phase difference regions and the second phase difference regions are alternately arranged in a stripe shape.
(4) The retardation plate according to any one of (1) to (3), wherein there is substantially no alignment film between the first pattern optical anisotropic layer and the second pattern optical anisotropic layer. .
(5) A circularly polarizing plate comprising at least a polarizing film and the retardation plate according to any one of (1) to (4),
A polarizing film, a first patterned optically anisotropic layer, and a second patterned optically anisotropic layer in this order;
An absorption axis of the polarizing film and an in-plane slow axis on the surface on the polarizing film side in one of the first retardation region and the second retardation region of the first patterned optically anisotropic layer A circularly polarizing plate that is parallel or orthogonal.

(6) A pattern including a first phase difference region and a second phase difference region whose in-plane slow axis directions are different from each other, and the first phase difference region and the second phase difference region are alternately arranged in the plane. A retardation plate having at least an optically anisotropic layer,
The pattern optical anisotropic layer is a layer in which a first pattern optical anisotropic layer and a second pattern optical anisotropic layer are laminated,
The in-plane slow axis on the surface opposite to the second pattern optical anisotropic layer side in the first retardation region of the first pattern optical anisotropic layer, and the second of the first pattern optical anisotropic layer The in-plane slow axis on the surface opposite to the second pattern optically anisotropic layer side in the retardation region is orthogonal to the surface,
The first pattern optical anisotropic layer and the second pattern optical anisotropic layer include a twist-aligned liquid crystal compound having a thickness direction as a helical axis,
The twist direction of the liquid crystal compound in the first retardation region and the second retardation region in the first pattern optical anisotropic layer, and the first retardation region and the second retardation region in the second pattern optical anisotropic layer The twist direction of the liquid crystal compound is the same,
The twist angle of the liquid crystal compound in the first pattern optically anisotropic layer is 59.7 ± 10.0 °;
The twist angle of the liquid crystal compound in the second patterned optically anisotropic layer is 127.6 ± 10.0 °;
In the first retardation region and the second retardation region, an in-plane slow axis on the surface of the first pattern optical anisotropic layer on the second pattern optical anisotropic layer side, and the second pattern optical anisotropic layer Is perpendicular to the in-plane slow axis on the surface of the first pattern optically anisotropic layer side of
The value of the product Δn1 · d1 of the refractive index anisotropy Δn1 of the first pattern optical anisotropic layer measured at a wavelength of 550 nm and the thickness d1 of the first pattern optical anisotropic layer, and the second pattern measured at a wavelength of 550 nm The value of the product Δn2 · d2 of the refractive index anisotropy Δn2 of the optically anisotropic layer and the thickness d2 of the second patterned optically anisotropic layer satisfies the following expressions (3) and (4), respectively. Phase difference plate.
Formula (3) 111 nm ≦ Δn1 · d1 ≦ 171 nm
Formula (4) 252 nm ≦ Δn 2 · d 2 ≦ 312 nm

(7) The phase difference plate according to (6), wherein the liquid crystal compound is a discotic liquid crystal compound or a rod-like liquid crystal compound.
(8) The retardation plate according to (6) or (7), wherein the first retardation region and the second retardation region are alternately arranged in a stripe shape.
(9) The retardation plate according to any one of (6) to (8), wherein there is substantially no alignment film between the first pattern optical anisotropic layer and the second pattern optical anisotropic layer. .
(10) A circularly polarizing plate comprising at least a polarizing film and the phase difference plate according to any one of (6) to (9),
A polarizing film, a first patterned optically anisotropic layer, and a second patterned optically anisotropic layer in this order;
An absorption axis of the polarizing film and an in-plane slow axis on the surface on the polarizing film side in one of the first retardation region and the second retardation region of the first patterned optically anisotropic layer A circularly polarizing plate that is parallel or orthogonal.
(11) a display panel driven based on an image signal;
The retardation plate according to any one of (1) to (4) and (6) to (9) disposed on the viewing side of the display panel, or any of (5) and (10) A 3D image display device having at least the circularly polarizing plate according to one.

ADVANTAGE OF THE INVENTION According to this invention, when sticking to a display apparatus as a circularly-polarizing plate, the phase difference plate by which the coloring at the time of face inclination is fully suppressed can be provided.
Moreover, according to this invention, the circularly-polarizing plate and 3D image display apparatus which have this phase difference plate can also be provided.

It is a perspective sectional view of the 1st embodiment of the phase contrast plate of the present invention. The figure which shows the relationship of each in-plane slow axis of the 1st pattern optical anisotropic layer 16a and the 2nd pattern optical anisotropic layer 18a in one aspect of the 1st embodiment of the phase difference plate of this invention. (A) is a partially enlarged perspective sectional view of the retardation plate, (B) is a first pattern optical anisotropic in the first retardation region when observed from the direction of the arrow in FIG. It is the schematic which shows the relationship of the angle of the in-plane slow axis of the crystalline layer 16a and the 2nd pattern optically anisotropic layer 18a, (C) is the 2nd position when it observes from the direction of the arrow of (A) figure. It is the schematic which shows the relationship of the angle of the in-plane slow axis of the 1st pattern optically anisotropic layer 16a and the 2nd pattern optically anisotropic layer 18a in a phase difference area | region. It is a perspective sectional view of the 2nd embodiment of the phase contrast plate of the present invention. The figure which shows the relationship of the in-plane slow axis of each of the 1st pattern optical anisotropic layer 16b and the 2nd pattern optical anisotropic layer 18b in one aspect of the 2nd embodiment of the phase difference plate of this invention. (A) is a partially enlarged perspective sectional view of the retardation plate, (B) is a first pattern optical anisotropic in the first retardation region when observed from the direction of the arrow in FIG. It is the schematic which shows the relationship of the angle of the in-plane slow axis of the crystalline layer 16b and the 2nd pattern optically anisotropic layer 18b, (C) is the 2nd position when it observes from the direction of the arrow of (A) figure. It is the schematic which shows the relationship of the angle of the in-plane slow axis of the 1st pattern optical anisotropic layer 16b and the 2nd pattern optical anisotropic layer 18b in a phase difference area | region. It is an example of the schematic sectional drawing of the 1st embodiment of the circularly-polarizing plate of this invention. In one aspect of the first embodiment of the circularly polarizing plate of the present invention, the absorption axis of the polarizing film 32 and the respective in-planes of the first pattern optical anisotropic layer 16a and the second pattern optical anisotropic layer 18a It is a figure showing requirements (a) with a slow axis, (A) is a partially enlarged perspective sectional view of a circularly polarizing plate, (B) when observed from the direction of the arrow in (A) figure, It is the schematic which shows the relationship of the angle of the in-plane slow axis of the 1st pattern optical anisotropic layer 16a and the in-plane slow axis of the 2nd pattern optical anisotropic layer 18a in a 1st phase difference area | region. , (C) is the in-plane slow axis of the first pattern optical anisotropic layer 16a and the second pattern optical anisotropy in the second retardation region when observed from the direction of the arrow in FIG. It is the schematic which shows the relationship of the angle with the in-plane slow axis of the layer 18a. It is an example of the schematic sectional drawing of the 2nd embodiment of the circularly-polarizing plate of this invention. It is an example of the schematic sectional drawing of the 3rd embodiment of the circularly-polarizing plate of this invention. In one aspect of the third embodiment of the circularly polarizing plate of the present invention, the absorption axis of the polarizing film 32 and the respective in-planes of the first pattern optical anisotropic layer 16b and the second pattern optical anisotropic layer 18b It is a figure showing requirements (b) with a slow axis, (A) is a partially enlarged perspective cross-sectional view of a circularly polarizing plate, (B) is when observed from the direction of the arrow in (A) Figure, It is the schematic which shows the relationship of the angle of the in-plane slow axis of the 1st pattern optical anisotropic layer 16b and the in-plane slow axis of the 2nd pattern optical anisotropic layer 18b in a 1st phase difference area | region. , (C) is the in-plane slow axis of the first pattern optical anisotropic layer 16b and the second pattern optical anisotropy in the second retardation region when observed from the direction of the arrow in FIG. It is the schematic which shows the relationship of the angle with the in-plane slow axis of the layer 18b. It is an example of the schematic sectional drawing of the 4th embodiment of the circularly-polarizing plate of this invention.

Hereinafter, the present invention will be described in detail. 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. First, terms used in this specification will be described.

Re (λ) and Rth (λ) represent in-plane retardation at wavelength λ and retardation in the thickness direction, respectively. Re (λ), Rth (λ), and Δnd are measured by AXOSCAN (manufactured by AXOMETRICS).

In the present specification, “visible light” means 380 nm to 780 nm. Moreover, in this specification, when there is no special mention about a measurement wavelength, a measurement wavelength is 550 nm.
Further, in this specification, the angle relationship (for example, “orthogonal”, “parallel”, 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.

Below, the suitable aspect of the phase difference plate of this invention is explained in full detail.
One of the features of the present invention is that a multilayer optically anisotropic layer having a patterned optically anisotropic layer containing a twisted liquid crystal compound is used as the patterned optically anisotropic layer. Is mentioned. More specifically, by controlling Δnd of the first pattern optical anisotropic layer and the twist angle of the liquid crystal compound, and Δnd of the second pattern optical anisotropic layer and the twist angle of the liquid crystal compound, a known level is obtained. Compared with the phase difference plate, a wideband pattern phase difference plate capable of converting linearly polarized light with a wider wavelength into more complete circularly polarized light can be realized, and as a result, coloring when the face is inclined is suppressed.
In general, when two layers of optical anisotropy are laminated using a liquid crystal compound, after forming an alignment film, a first optical anisotropy layer is formed on the alignment film, and then the first layer is formed. An alignment film is formed again on the optical anisotropic layer, and then a second optical anisotropic layer is formed on the alignment film. That is, the alignment film needs to be prepared twice.
On the other hand, in the retardation plate of the present invention, the liquid crystal compound in one optically anisotropic layer is twisted and oriented, so that the step of providing the orientation film can be performed once. More specifically, after forming the alignment film, forming a first pattern optical anisotropic layer containing a liquid crystal compound that twists and aligns on the alignment film, the surface on the exposed surface of the first pattern optical anisotropic layer The inner slow axis is rotated by a predetermined angle with respect to the in-plane slow axis on the surface on the side where the alignment film is present. Therefore, when a liquid crystal compound is further applied to the surface of the first pattern optical anisotropic layer, the exposure having a predetermined angle relationship with the in-plane slow axis on the surface on the side where the alignment film of the first pattern optical anisotropic layer is present Since the liquid crystal compound is aligned along the in-plane slow axis of the surface, it is possible to save the trouble of providing a separate alignment film.

<First Embodiment>
Below, the 1st embodiment of the phase difference plate (3D image display apparatus optical film) of this invention is demonstrated with reference to drawings. FIG. 1 shows a schematic cross-sectional view of a first embodiment of a retardation plate of the present invention. In addition, the figure in this invention is a schematic diagram, and the relationship of the thickness of each layer, a positional relationship, etc. do not necessarily correspond with an actual thing. The same applies to the following figures.
The retardation film 10a has at least a patterned optical anisotropic layer 14a. The patterned optically anisotropic layer 14a has a structure in which the first retardation regions 20a and the second retardation regions 22a are alternately arranged in a stripe pattern in order. The retardation plate 10a may include a transparent support described later.
The patterned optical anisotropic layer 14a is a layer formed by laminating the first patterned optical anisotropic layer 16a and the second patterned optical anisotropic layer 18a, and is formed on the first patterned optical anisotropic layer 16a. Includes a twist-aligned liquid crystal compound having a thickness direction as a helical axis.
As shown in FIG. 1, the first retardation region 20a and the second retardation region 22a are intended to cover the entire area in the thickness direction of the patterned optical anisotropic layer 14a. The first retardation region of the patterned optically anisotropic layer 16a means the region 24a in FIG. 1, and the first retardation region of the second patterned optically anisotropic layer 18a means the region 26a in FIG. In addition, the second retardation region of the first pattern optical anisotropic layer 16a means the region 28a in FIG. 1, and the second retardation region of the second pattern optical anisotropic layer 18a in FIG. It means the region 30a.
Below, the structure of each layer is explained in full detail.

[Pattern optical anisotropic layer]
The patterned optically anisotropic layer 14a includes a first retardation region 20a and a second retardation region 22a whose in-plane slow axis directions are different from each other, and the first retardation region 20a and the second retardation region 22a are They are arranged alternately in the plane. Although FIG. 1 shows a mode in which the first phase difference region 20a and the second phase difference region 22a are arranged in a stripe shape, the present invention is not limited to this mode.
The patterned optical anisotropic layer 14a includes a first patterned optical anisotropic layer 16a and a second patterned optical anisotropic layer 18a.
Hereinafter, the first pattern optical anisotropic layer 16a and the second pattern optical anisotropic layer 18a will be described in detail with reference to FIGS. FIG. 2 is a partially enlarged perspective sectional view of the first retardation region 20a and the second retardation region 22a in the patterned optical anisotropic layer 14a. Arrows in the patterned optically anisotropic layer 16a represent in-plane slow axes in the respective layers.

(First pattern optical anisotropic layer)
The first pattern optically anisotropic layer 16a includes a twisted liquid crystal compound having a thickness direction as a helical axis. The first patterned optically anisotropic layer 16a preferably exhibits a chiral nematic phase having a so-called spiral structure, a cholesteric phase, or the like. The liquid crystal compound will be described in detail later. As the liquid crystal compound used in the first pattern optical anisotropic layer 16a, a liquid crystal compound exhibiting a nematic liquid crystal phase is preferably used. In addition, when forming the said phase, it is preferable to use what mixed the liquid crystal compound which shows a nematic liquid crystal phase, and the chiral agent mentioned later.

The first pattern optical anisotropic layer 16a has a first retardation region and a second retardation region, as in a second pattern optical anisotropic layer 18a described later, and the liquid crystal compound contained in each region. The twist directions of the same are the same.
More specifically, as shown in FIG. 2B, the first phase difference region (region 24a) of the first pattern optical anisotropic layer 16a is opposite to the second pattern optical anisotropic layer 18a side. The in-plane slow axis on the surface 161a on the side and the in-plane slow axis on the surface 162a on the second pattern optical anisotropic layer 18a side form a predetermined twist angle θ1Ax described later. In the first retardation region (region 24a) of the first patterned optically anisotropic layer 16a, the in-plane slow axis rotates by a predetermined angle, and the twist direction of the liquid crystal compound is clockwise as shown by the arrow in FIG. Shows rotation (right twist).
On the other hand, also in the second retardation region (region 28a) of the first pattern optical anisotropic layer 16a, as shown in FIG. 2C, the surface opposite to the second pattern optical anisotropic layer 18a side. The in-plane slow axis at 161a and the in-plane slow axis at the surface 162a on the second pattern optical anisotropic layer 18a side form a predetermined twist angle θ1Ay described later. As shown by the arrow in FIG. 2C, the twist direction of the liquid crystal compound shows clockwise rotation (right twist).
Note that the twist direction is observed from the white arrow in FIG. 2A, and the right direction is based on the in-plane slow axis on the front surface (surface 161a) in the first pattern optical anisotropic layer 16a. Judge the twist or the left twist.

An in-plane slow axis on the surface (surface 161a) opposite to the second pattern optical anisotropic layer 18a side in the first retardation region (region 24a) of the first pattern optical anisotropic layer 16a; The in-plane slow axis on the surface (161a) opposite to the second pattern optical anisotropic layer 18a side in the second retardation region of the one pattern optical anisotropic layer 16a is orthogonal. The definition of orthogonal is as described above.

The twist angle of the liquid crystal compound (the twist angle in the alignment direction of the liquid crystal compound) is 26.5 ± 10.0 °, and the tint when the retardation plate of the present invention is bonded to a display device as a circularly polarizing plate is displayed. In terms of fewer points (hereinafter, simply referred to as “the point where the effect of the present invention is more excellent”), 26.5 ± 8.0 ° is more preferable, and 26.5 ± 6.0 ° is more preferable.
When the twist angle is less than 16.5 ° and more than 36.5 °, the tint when the retardation plate of the present invention is bonded to a display device as a circularly polarizing plate is large.
In addition, the measuring method of a twist angle uses the Axoscan (polarimeter) apparatus of Axometrics, and measures it using the analysis software of the company.
In addition, the twisted orientation of the liquid crystal compound means that the liquid crystal compound from one main surface to the other main surface of the first pattern optical anisotropic layer 16a with the thickness direction of the first pattern optical anisotropic layer 16a as an axis. Intended to twist. Accordingly, the alignment direction (in-plane slow axis direction) of the liquid crystal compound varies depending on the position in the thickness direction of the first pattern optical anisotropic layer 16a.

The product Δn1 · d1 of the refractive index anisotropy Δn1 of the first pattern optical anisotropic layer 16a and the thickness d1 of the first pattern optical anisotropic layer 16a measured at a wavelength of 550 nm is expressed by the following formula (1). Fulfill. That is, the values of the products Δn1 · d1 in the first retardation region (region 24a) and the second retardation region (region 28a) of the first patterned optically anisotropic layer 16a both satisfy the following formula (1). .
Formula (1) 252 nm ≦ Δn1 · d1 ≦ 312 nm
Especially, it is preferable to satisfy | fill Formula (1A) by the point which the effect of this invention is more excellent, and it is more preferable to satisfy Formula (1B).
Formula (1A) 262 nm ≦ Δn1 · d1 ≦ 302 nm
Formula (1B) 272 nm ≦ Δn1 · d1 ≦ 292 nm
When Δn1 · d1 is less than 252 nm and more than 312 nm, the tint when the retardation plate of the present invention is bonded to a display device as a circularly polarizing plate is large.
The refractive index anisotropy Δn means the refractive index anisotropy of the optically anisotropic layer.
In addition, the measurement method of Δn1 · d1 is measured using the Axoscan (polarimeter) apparatus of Axometrics and the analysis software of the same company as the measurement method of the twist angle.

(Second pattern optical anisotropic layer)
Similar to the first pattern optical anisotropic layer 16a, the second pattern optical anisotropic layer 18a includes a twist-aligned liquid crystal compound having a thickness direction as a helical axis. The description regarding the liquid crystal compound is as described above.

The in-plane slow axis at the surface 162a on the second pattern optical anisotropic layer 18a side of the first pattern optical anisotropic layer 16a, and the first pattern optical anisotropic layer of the second pattern optical anisotropic layer 18a The in-plane slow axis on the surface 181a on the 16a side is arranged in parallel. Note that the above relationship is satisfied in each of the first phase difference region and the second phase difference region.
More specifically, the in-plane slow axis at the surface 162a in the first retardation region (region 24a) of the first pattern optical anisotropic layer 16a and the first position of the second pattern optical anisotropic layer 18a. The surface at the surface 162a in the second phase difference region (region 28a) of the first pattern optical anisotropic layer 16a is arranged in parallel with the in-plane slow axis at the surface 181a in the phase difference region (region 26a). The inner slow axis and the in-plane slow axis at the surface 181a in the second retardation region (region 30a) of the second patterned optically anisotropic layer 18a are arranged in parallel.

Similarly to the first pattern optical anisotropic layer 16a described above, the second pattern optical anisotropic layer 18a has a first retardation region and a second retardation region, and a liquid crystal compound contained in each region. The twist direction of the same is the same.
More specifically, as shown in FIG. 2B, in the first retardation region (region 26a) of the second pattern optical anisotropic layer 18a, the surface 181a on the first pattern optical anisotropic layer 16a side. And the in-plane slow axis on the surface 182a opposite to the second pattern optical anisotropic layer 18a side form a predetermined twist angle θ2Ax described later. That is, the in-plane slow axis rotates by a predetermined angle in the first retardation region (region 26a) of the second patterned optically anisotropic layer 18a, and the twist direction of the liquid crystal compound as shown by the arrow in FIG. Indicates clockwise rotation (right twist).
On the other hand, also in the second retardation region (region 30a) of the second pattern optical anisotropic layer 18a, as shown in FIG. 2C, the surface at the surface 181a on the first pattern optical anisotropic layer 16a side. The inner slow axis and the in-plane slow axis on the surface 182a opposite to the second pattern optical anisotropic layer 18a side form a predetermined twist angle θ2Ay described later. As shown by the arrow in FIG. 2C, the twist direction of the liquid crystal compound shows clockwise rotation (right twist).
The twist direction is observed from the white arrow in FIG. 2 (A), and the right side with respect to the in-plane slow axis on the front surface (surface 181a) in the second pattern optical anisotropic layer 18a. Judge the twist or the left twist.

The twist angle of the liquid crystal compound (the twist angle in the alignment direction of the liquid crystal compound) is 78.6 ± 10.0 °, and 78.6 ± 8.0 ° is more preferable in terms of more excellent effects of the present invention. More preferably, 6 ± 6.0 °.
When the twist angle is less than 68.6 ° and more than 88.6 °, the tint when the retardation plate of the present invention is bonded to a display device as a circularly polarizing plate is large.
In addition, the measuring method of a twist angle uses the Axoscan (polarimeter) apparatus of Axometrics, and measures it using the analysis software of the company.

The twist direction of the liquid crystal compound in the second pattern optical anisotropic layer 18a is the same as the twist direction of the liquid crystal compound in the first pattern optical anisotropic layer 16a. For example, if the twist direction of the liquid crystal compound in the first pattern optical anisotropic layer 16a is right twist, the twist direction of the liquid crystal compound in the second pattern optical anisotropic layer 18a is also right twist.

The product Δn2 · d2 of the refractive index anisotropy Δn2 of the second pattern optical anisotropic layer 18a measured at a wavelength of 550 nm and the thickness d2 of the second pattern optical anisotropic layer 18a is expressed by the following formula (2). Fulfill. That is, the values of the products Δn2 · d2 in the first retardation region (region 26a) and the second retardation region (region 30a) of the second patterned optically anisotropic layer 18a both satisfy the following formula (2). .
Formula (2) 110 nm ≦ Δn 2 · d 2 ≦ 170 nm
Especially, it is preferable to satisfy | fill Formula (2A) by the point which the effect of this invention is more excellent, and it is more preferable to satisfy Formula (2B).
Formula (2A) 120 nm ≦ Δn 2 · d 2 ≦ 160 nm
Formula (2B) 130 nm ≦ Δn 2 · d 2 ≦ 150 nm
When Δn2 · d2 is less than 110 nm and more than 170 nm, the tint when the retardation plate of the present invention is bonded to a display device as a circularly polarizing plate is large.
In addition, the measuring method of Δn2 · d2 is measured by using the Axoscan (polarimeter) device of Axometrics and the analysis software of the same company as the measuring method of the twist angle.

The twist direction of the liquid crystal compound in the first phase difference region and the second phase difference region in the first pattern optical anisotropic layer 16a described above, and the first phase difference region and the first phase difference in the second pattern optical anisotropic layer 18a. The twist direction of the liquid crystal compound in the two phase difference region is the same.

In FIG. 2, the case where the twist direction of the liquid crystal compound in the first pattern optical anisotropic layer 16a and the second pattern optical anisotropic layer 18a is right twist is described in detail, but the present invention is not limited to this mode. The twist direction of the liquid crystal compound in the first pattern optical anisotropic layer 16a and the second pattern optical anisotropic layer 18a may be left twist.
In FIG. 2, the right twist means a right twist (clockwise twist) when observing from the first pattern optical anisotropic layer 16a toward the second pattern optical anisotropic layer 18a. .

An alignment film described later may be disposed between the first pattern optical anisotropic layer 16a and the second pattern optical anisotropic layer 18a, but as shown in FIG. The anisotropic layer 16a and the second patterned optical anisotropic layer 18a are adjacent to each other, and an alignment film is substantially formed between the first patterned optical anisotropic layer 16a and the second patterned optical anisotropic layer 18a. It is preferable not to have it. When there is substantially no alignment film between the first pattern optical anisotropic layer 16a and the second pattern optical anisotropic layer 18a, a covalent bond between compounds contained in each optical anisotropic layer is used. Because it can, it is more excellent in adhesion.
Further, as described above, since the first pattern optical anisotropic layer 16a includes the twisted liquid crystal compound, a desired retardation plate can be obtained without performing the rubbing treatment. More specifically, after forming the first pattern optical anisotropic layer 16a, when forming the second pattern optical anisotropic layer 18a using a liquid crystal compound thereon, the first pattern optical anisotropic layer If the liquid crystal compound is applied on the surface 162a without rubbing, the liquid crystal compound is aligned along the alignment state of the surface 162a. Can be oriented to obtain a desired retardation plate.
In this specification, “substantially no alignment film” means that a film formed only for functioning as an alignment film is not included. Even when the surface of the lower layer contributes to the alignment of the liquid crystalline compound of the upper layer, unless the lower layer is formed only for use as an alignment film, It is included in the present invention.

The type of liquid crystal compound used for forming the first pattern optical anisotropic layer 16a or the second pattern optical anisotropic layer 18a is not particularly limited. For example, after forming a low molecular weight liquid crystalline compound in a nematic orientation in a liquid crystal state, an optically anisotropic layer obtained by fixing by photocrosslinking or thermal crosslinking, or after forming a polymer liquid crystalline compound in a nematic orientation in a liquid crystal state, An optically anisotropic layer obtained by fixing the orientation by cooling can also be used.

In general, liquid crystal compounds can be classified into a rod-shaped type (bar-shaped liquid crystal compound) and a disk-shaped type (discotic liquid crystal compound) based on their shapes. In addition, there are low and high molecular types, respectively. Polymer generally refers to a polymer having a degree of polymerization of 100 or more (Polymer Physics / Phase Transition Dynamics, Masao Doi, 2 pages, Iwanami Shoten, 1992). In the present invention, any liquid crystal compound can be used, but a rod-like liquid crystal compound or a discotic liquid crystal compound is preferably used. Two or more kinds of rod-like liquid crystal compounds, two or more kinds of discotic liquid crystal compounds, or a mixture of a rod-like liquid crystal compound and a discotic liquid crystal compound may be used.
As the rod-like liquid crystal compound, for example, those described in claim 1 of JP-A No. 11-53019 and paragraphs [0026] to [0098] of JP-A-2005-289980 can be preferably used. As the discotic liquid crystal compound, for example, those described in paragraphs [0020] to [0067] of JP-A-2007-108732 and paragraphs [0013] to [0108] of JP-A-2010-244038 are preferably used. However, it is not limited to these.
The first pattern optical anisotropic layer 16a or the second pattern optical anisotropic layer 18a can be formed by using a rod-like liquid crystal compound or a discotic liquid crystal compound having a polymerizable group, since the temperature change and the humidity change can be reduced. Is more preferable. The liquid crystal compound may be a mixture of two or more types, and in that case, at least one preferably has two or more polymerizable groups.
That is, the first pattern optical anisotropic layer 16a or the second pattern optical anisotropic layer 18a is a layer formed by fixing a rod-like liquid crystal compound having a polymerizable group or a discotic liquid crystal compound by polymerization or the like. In this case, it is no longer necessary to exhibit liquid crystallinity after forming a layer.
The kind of the polymerizable group contained in the discotic liquid crystal compound and the rod-like liquid crystal compound is not particularly limited, and a functional group capable of addition polymerization reaction is preferable, and a polymerizable ethylenically unsaturated group or a ring polymerizable group is preferable. More specifically, a (meth) acryloyl group, a vinyl group, a styryl group, an allyl group, etc. are mentioned preferably, and a (meth) acryloyl group is more preferable.

Examples of the method for forming the patterned optically anisotropic layer 14a include the following preferred embodiments, but are not limited thereto, and various known methods (for example, first pattern optics including a liquid crystal compound) And a method using a composition for forming an anisotropic layer and a composition for forming a second pattern optically anisotropic layer).
The first preferred embodiment utilizes a plurality of actions for controlling the alignment of the liquid crystal compound, and then eliminates any action by an external stimulus (heat treatment, etc.) to make the predetermined alignment control action dominant. Is the method. As the above method, for example, the liquid crystalline compound is brought into a predetermined alignment state by the combined action of the alignment control ability by the alignment film and the alignment control ability of the alignment controller added to the liquid crystalline compound, and then fixed. After forming one phase difference region, any action (for example, action by the alignment control agent) disappears by external stimulation (heat treatment, etc.), and the other orientation control action (action by the alignment film) dominates. Thus, another alignment state is realized and fixed to form the other retardation region. Details of this method are described in paragraphs [0017] to [0029] of Japanese Patent Application Laid-Open No. 2012-008170, the contents of which are incorporated herein by reference.

The second preferred embodiment is an embodiment using a pattern alignment film. In this embodiment, pattern alignment films having different alignment control capabilities are formed, a liquid crystalline compound is disposed thereon, and the liquid crystalline compound is aligned. The liquid crystalline compounds achieve different alignment states depending on the alignment control ability of the pattern alignment film. By fixing each alignment state, the pattern of the 1st and 2nd phase difference area | region is formed according to the pattern of an alignment film. The pattern alignment film can be formed using a printing method, mask rubbing for the rubbing alignment film, mask exposure for the photo alignment film, or the like. A method using a printing method is preferable in that large-scale equipment is not required and manufacturing is easy. Details of this method are described in paragraphs [0166] to [0181] of JP2012-032661A, the contents of which are incorporated herein by reference.

As a third preferred embodiment, for example, a photo acid generator is added to the alignment film. In this example, a photoacid generator is added to the alignment film, and pattern exposure exposes a region where the photoacid generator is decomposed to generate an acidic compound and a region where no acid compound is generated. The photoacid generator remains almost undecomposed in the non-irradiated portion, and the interaction between the alignment film material, the liquid crystal compound, and the alignment control agent added as necessary dominates the alignment state, and the liquid crystal compound Is oriented in a direction whose slow axis is perpendicular to the rubbing direction. When the alignment film is irradiated with light and an acidic compound is generated, the interaction is no longer dominant, the rubbing direction of the rubbing alignment film controls the alignment state, and the liquid crystalline compound has its slow axis parallel to the rubbing direction. To parallel orientation. As the photoacid generator used in the alignment film, a water-soluble compound is preferably used. Examples of photoacid generators that can be used include Prog. Polym. Sci. , Vol. 23, p. 1485 (1998). As the photoacid generator, pyridinium salts, iodonium salts and sulfonium salts are particularly preferably used. Details of this method are described in Japanese Patent Application No. 2010-289360, the contents of which are incorporated herein by reference.

[Polymerization initiator]
The aligned (preferably vertically aligned) liquid crystalline compound is preferably fixed while maintaining the alignment state. The immobilization is preferably carried out by a polymerization reaction of a polymerizable group introduced into the liquid crystal compound using a polymerization initiator. The polymerization reaction includes a thermal polymerization reaction using a thermal polymerization initiator and a photopolymerization reaction using a photopolymerization initiator. A photopolymerization reaction is preferred.
The amount of the polymerization initiator used is 0.01 to 20% by mass of the solid content of the composition for forming the first pattern optical anisotropic layer or the composition for forming the second pattern optical anisotropic layer). It is more preferable that the content is 0.5 to 5% by mass.

[Chiral agent]
When forming the 1st pattern optical anisotropic layer 16a and the 2nd pattern optical anisotropic layer 18a, a chiral agent may be used if desired with the above-mentioned liquid crystal compound as needed. The chiral agent is added to twist and align the liquid crystal compound. Of course, if the liquid crystalline compound is an optically active compound such as having an asymmetric carbon in the molecule, the addition of the chiral agent is unnecessary. It is. Further, depending on the production method and the twist angle, it is not necessary to add a chiral agent.
The chiral agent is not particularly limited as long as it is compatible with the liquid crystal compound used in combination. Use any of known chiral agents (for example, “Liquid Crystal Device Handbook” edited by Japan Society for the Promotion of Science 142nd Committee, Chapter 3-4-3, TN, chiral agent for STN, page 199, 1989) Can do. A chiral agent generally contains an asymmetric carbon atom, but an axially asymmetric compound or a planar asymmetric compound containing no asymmetric carbon atom can also be used as the chiral agent. Examples of the axial asymmetric compound or the planar asymmetric compound include binaphthyl, helicene, paracyclophane, and derivatives thereof. Moreover, the chiral agent may have liquid crystallinity.

[Other additives for optically anisotropic layer]
Along with the liquid crystal compound, a plasticizer, a surfactant, a polymerizable monomer, and the like can be used in combination to improve the uniformity of the coating film, the strength of the film, the orientation of the liquid crystal compound, and the like. These materials are preferably compatible with the liquid crystal compound and do not inhibit the alignment.
Moreover, in order to make a liquid crystal compound into a horizontal alignment and a vertical alignment state, you may use the additive (alignment control agent) which accelerates a horizontal alignment and a vertical alignment. Various known additives can be used as the additive.

Examples of the polymerizable monomer include radically polymerizable or cationically polymerizable compounds. Preferably, it is a polyfunctional radically polymerizable monomer and is preferably copolymerizable with the polymerizable group-containing liquid crystalline compound. Examples thereof include those described in paragraph numbers [0018] to [0020] in JP-A No. 2002-296423. The amount of the compound added is generally in the range of 1 to 50% by mass and preferably in the range of 5 to 30% by mass with respect to the liquid crystal molecules.

Examples of the surfactant include conventionally known compounds, and fluorine compounds are particularly preferable. Specifically, for example, compounds described in paragraphs [0028] to [0056] in JP-A-2001-330725, and paragraphs [0069] to [0126] in Japanese Patent Application No. 2003-295212 are described. The compound of this is mentioned.

The polymer used together with the liquid crystal compound is preferably capable of thickening the coating solution. A cellulose ester can be mentioned as an example of a polymer. Preferable examples of the cellulose ester include those described in paragraph [0178] of JP-A No. 2000-155216. The addition amount of the polymer is preferably in the range of 0.1 to 10% by mass, and in the range of 0.1 to 8% by mass with respect to the liquid crystal molecules so as not to inhibit the alignment of the liquid crystal compound. It is more preferable.
The discotic nematic liquid crystal phase-solid phase transition temperature of the liquid crystal compound is preferably 70 to 300 ° C, and more preferably 70 to 170 ° C.

[Coating solvent]
As the solvent used for the preparation of the composition (the first pattern optical anisotropic layer forming composition or the second pattern optical anisotropic layer forming composition), an organic solvent is preferably used. Examples of organic solvents include amides (eg N, N-dimethylformamide), sulfoxides (eg dimethyl sulfoxide), heterocyclic compounds (eg pyridine), hydrocarbons (eg benzene, hexane), alkyl halides (eg , Chloroform, dichloromethane), esters (eg, methyl acetate, ethyl acetate, butyl acetate), ketones (eg, acetone, methyl ethyl ketone), ethers (eg, tetrahydrofuran, 1,2-dimethoxyethane). Alkyl halides and ketones are preferred. Two or more organic solvents may be used in combination.

[Alignment film]
In the present invention, a liquid crystal compound (for example, a discotic liquid crystal compound) is formed by applying the first pattern optical anisotropic layer forming composition or the second pattern optical anisotropic layer forming composition onto the surface of the alignment film. The molecules may be oriented. Since the alignment film has a function of defining the alignment direction of the liquid crystalline compound, it is preferably used for realizing a preferred embodiment of the present invention. However, if the alignment state is fixed after aligning the liquid crystalline compound, the alignment film plays the role, and thus is not necessarily an essential component of the present invention.
The alignment film is an organic compound (eg, ω-tricosanoic acid) formed by rubbing treatment of an organic compound (preferably polymer), oblique deposition of an inorganic compound, formation of a layer having a microgroove, or Langmuir-Blodgett method (LB film). , Dioctadecylmethylammonium chloride, methyl stearylate). Furthermore, an alignment film in which an alignment function is generated by application of an electric field, application of a magnetic field, or light irradiation (preferably polarized light) is also known.
The alignment film is preferably formed by polymer rubbing treatment.

Examples of the polymer include, for example, methacrylate copolymers, styrene copolymers, polyolefins, polyvinyl alcohols and modified polyvinyl alcohols described in paragraph No. [0022] of JP-A-8-338913, poly (N— Methylolacrylamide), polyester, polyimide, vinyl acetate copolymer, carboxymethylcellulose, polycarbonate and the like. Silane coupling agents can be used as the polymer. Water-soluble polymers (eg, poly (N-methylolacrylamide), carboxymethylcellulose, gelatin, polyvinyl alcohol, modified polyvinyl alcohol) are preferred, gelatin, polyvinyl alcohol and modified polyvinyl alcohol are more preferred, and polyvinyl alcohol and modified polyvinyl alcohol are most preferred. .

The alignment film is basically formed by applying a solution containing the polymer as an alignment film forming material and an optional additive (for example, a crosslinking agent) on a transparent support, followed by drying by heating (crosslinking), and rubbing treatment. Can be formed.
For the rubbing treatment, a treatment method widely adopted as a liquid crystal alignment treatment process of the LCD can be applied. That is, a method of obtaining the orientation by rubbing the surface of the orientation film in a certain direction using paper, gauze, felt, rubber, nylon, polyester fiber or the like can be used. Generally, it is carried out by rubbing several times using a cloth or the like in which fibers having a uniform length and thickness are planted on average.

<Second Embodiment>
Below, the 2nd embodiment of the phase difference plate of this invention is described with reference to drawings. FIG. 3 shows a schematic cross-sectional view of the second embodiment of the retardation plate of the present invention.
The retardation plate 10b has a patterned optical anisotropic layer 14b. The patterned optical anisotropic layer 14b has a structure in which the first retardation regions 20b and the second retardation regions 22b are alternately arranged in a stripe pattern in order. The retardation plate 10b may include a transparent support described later.
The patterned optical anisotropic layer 14b is a layer formed by laminating the first patterned optical anisotropic layer 16b and the second patterned optical anisotropic layer 18b, and the first patterned optical anisotropic layer 16b and The second pattern optical anisotropic layer 18b includes a twisted liquid crystal compound having a thickness direction as a helical axis.
The retardation plate 10b is composed of two patterned optically anisotropic layers as in the retardation plate 10a, but differs in respect of the retardation of the patterned optically anisotropic layer and the twist angle of the liquid crystal compound.
As shown in FIG. 3, each of the first retardation region 20b and the second retardation region 22b is a region extending over the entire thickness direction of the patterned optically anisotropic layer 14b. The first retardation region of the patterned optically anisotropic layer 16b means the region 24b in FIG. 1, and the first retardation region of the second patterned optically anisotropic layer 18b means the region 26b in FIG. The second retardation region of the first pattern optical anisotropic layer 16b means the region 28b in FIG. 1, and the second retardation region of the second pattern optical anisotropic layer 18b means the region in FIG. It means the region 30b.
Below, the structure different from the pattern optical anisotropic layer 14a of the pattern optical anisotropic layer 14b is mainly explained in full detail.

[Pattern optical anisotropic layer]
The patterned optically anisotropic layer 14b includes a first retardation region 20b and a second retardation region 22b having different in-plane slow axis directions, and the first retardation region 20b and the second retardation region 22b They are arranged alternately in the plane. Although FIG. 3 shows a mode in which the first phase difference region 20b and the second phase difference region 22b are arranged in a stripe shape, the present invention is not limited to this mode.
The patterned optical anisotropic layer 14b includes a first patterned optical anisotropic layer 16b and a second patterned optical anisotropic layer 18b.
Hereinafter, the first pattern optical anisotropic layer 16b and the second pattern optical anisotropic layer 18b will be described in detail with reference to FIGS. FIG. 4 is a partially enlarged perspective cross-sectional view of the first retardation region 20b and the second retardation region 22b in the patterned optical anisotropic layer 14b, and shows the second patterned optical anisotropic layer 18b and the first optical retardation layer 18b. Arrows in the patterned optically anisotropic layer 16b represent in-plane slow axes in the respective layers.

(First pattern optical anisotropic layer 16b)
The first patterned optically anisotropic layer 16b includes a twist-aligned liquid crystal compound having a thickness direction as a helical axis, like the first patterned optically anisotropic layer 16a shown in FIG. The preferred embodiment of the liquid crystal compound is as described above.

The first pattern optical anisotropic layer 16b has a first retardation region and a second retardation region, as in the second pattern optical anisotropic layer 18b described later, and the liquid crystal compound contained in each region. The twist directions of the same are the same.
More specifically, as shown in FIG. 4B, the first phase difference region (region 24b) of the first pattern optical anisotropic layer 16b is opposite to the second pattern optical anisotropic layer 18b side. The in-plane slow axis on the surface 161b on the side and the in-plane slow axis on the surface 162b on the second pattern optical anisotropic layer 18b side form a predetermined twist angle θ1Bx described later. That is, the in-plane slow axis rotates by a predetermined angle in the first retardation region (region 24b) of the first patterned optically anisotropic layer 16b, and the twist direction of the liquid crystal compound as shown by the arrow in FIG. Indicates clockwise rotation (right twist).
On the other hand, also in the second retardation region (region 28b) of the first pattern optical anisotropic layer 16b, as shown in FIG. 2C, the surface opposite to the second pattern optical anisotropic layer 18b side. The in-plane slow axis at 161b and the in-plane slow axis at the surface 162b on the second pattern optical anisotropic layer 18b side form a predetermined twist angle θ1By to be described later. As shown by the arrow in FIG. 2C, the twist direction of the liquid crystal compound shows clockwise rotation (right twist).
Note that the twist direction is observed from the white arrow in FIG. 4A and is based on the in-plane slow axis on the near surface (surface 161b) in the first pattern optical anisotropic layer 16b. Judge the twist or the left twist.

An in-plane slow axis on the surface (surface 161b) opposite to the second pattern optical anisotropic layer 18b side in the first retardation region (region 24b) of the first pattern optical anisotropic layer 16b; The in-plane slow axis on the surface (161b) opposite to the second pattern optical anisotropic layer 18b side in the second retardation region of the one pattern optical anisotropic layer 16b is orthogonal.

The twist angle of the liquid crystal compound is 59.7 ± 10.0 °, and 59.7 ± 8.0 ° is more preferable, and 59.7 ± 6.0 ° is more preferable in that the effect of the present invention is more excellent. .
When the twist angle is less than 49.7 ° and when it exceeds 69.7 °, the tint when the retardation plate of the present invention is bonded to a display device as a circularly polarizing plate is large.
The method for measuring the twist angle is as described above.

The product Δn1 · d1 of the refractive index anisotropy Δn1 of the first pattern optical anisotropic layer 16b and the thickness d1 of the first pattern optical anisotropic layer 16b measured at a wavelength of 550 nm is expressed by the following formula (1). Fulfill. That is, the values of the products Δn1 · d1 in the first retardation region (region 24b) and the second retardation region (region 28b) of the first patterned optically anisotropic layer 16b both satisfy the following formula (3). .
Formula (3) 111 nm ≦ Δn1 · d1 ≦ 171 nm
Especially, it is preferable to satisfy | fill Formula (3A) by the point which the effect of this invention is more excellent, and it is more preferable to satisfy Formula (3B) further.
Formula (3A) 121 nm ≦ Δn1 · d1 ≦ 161 nm
Formula (3B) 131 nm ≦ Δn1 · d1 ≦ 151 nm
When Δn1 · d1 is less than 111 nm and more than 171 nm, the tint when the retardation plate of the present invention is bonded to a display device as a circularly polarizing plate is large.
In addition, the measuring method of (DELTA) n1 * d1 uses the Axoscan (polarimeter) apparatus of Axometrics, and measures it using the analysis software of the company.

(Second pattern optical anisotropic layer)
Similar to the first pattern optical anisotropic layer 16b, the second pattern optical anisotropic layer 18b includes a twisted liquid crystal compound having a thickness direction as a helical axis. The description regarding the liquid crystal compound is as described above.

The in-plane slow axis at the surface 162b of the first pattern optical anisotropic layer 16b on the second pattern optical anisotropic layer 18b side, and the first pattern optical anisotropic layer of the second pattern optical anisotropic layer 18b It is orthogonal to the in-plane slow axis on the surface 181b on the 16b side. Note that the above relationship is satisfied in each of the first phase difference region and the second phase difference region.
More specifically, the in-plane slow axis at the surface 162b in the first retardation region (region 24b) of the first patterned optically anisotropic layer 16b and the first position of the second patterned optically anisotropic layer 18b. The phase difference region (region 26b) is disposed orthogonal to the in-plane slow axis on the surface 181b (that is, θ2Bx in FIG. 4 is 90 °), and the second position of the first pattern optical anisotropic layer 16b. The in-plane slow axis at the surface 162b in the phase difference region (region 28b) is orthogonal to the in-plane slow axis at the surface 181b in the second phase difference region (region 30b) of the second patterned optically anisotropic layer 18b. (That is, θ2By in FIG. 4 is 90 °).

Similarly to the first pattern optical anisotropic layer 16b described above, the second pattern optical anisotropic layer 18b has a first retardation region and a second retardation region, and a liquid crystal compound contained in each region. The twist directions of the same are the same.
More specifically, as shown in FIG. 4B, in the first retardation region (region 26b) of the second pattern optical anisotropic layer 18b, the surface 181b on the first pattern optical anisotropic layer 16b side. And the in-plane slow axis on the surface 182b opposite to the second pattern optical anisotropic layer 18b side form a predetermined twist angle θ3Bx described later. That is, the in-plane slow axis rotates by a predetermined angle in the first retardation region (region 26b) of the second patterned optically anisotropic layer 18b, and the twist direction of the liquid crystal compound as shown by the arrow in FIG. Indicates clockwise rotation (right twist).
On the other hand, also in the second retardation region (region 30b) of the second pattern optical anisotropic layer 18b, as shown in FIG. 4C, the surface at the surface 181b on the first pattern optical anisotropic layer 16b side. The inner slow axis and the in-plane slow axis on the surface 182b opposite to the second pattern optical anisotropic layer 18b side form a predetermined twist angle θ3By. And as shown by the arrow of FIG.4 (C), the twist direction of a liquid crystal compound shows clockwise rotation (right twist).
Note that the twist direction is observed from the white arrow in FIG. 4A, and the right direction is based on the in-plane slow axis on the front surface (surface 181b) in the second patterned optically anisotropic layer 18b. Judge the twist or the left twist.

The twist angle of the liquid crystal compound is 127.6 ± 10.0 °, and 127.6 ± 8.0 ° is more preferable, and 127.6 ± 6.0 ° is more preferable in that the effect of the present invention is more excellent. .
When the twist angle is less than 117.6 ° and more than 137.6 °, the tint when the retardation plate of the present invention is bonded to a display device as a circularly polarizing plate is large.
The method for measuring the twist angle is as described above.

The twist direction of the liquid crystal compound in the second pattern optical anisotropic layer 18b is the same as the twist direction of the liquid crystal compound in the first pattern optical anisotropic layer 16b. For example, if the twist direction of the liquid crystal compound in the first pattern optical anisotropic layer 16b is right twist, the twist direction of the liquid crystal compound in the second pattern optical anisotropic layer 18b is also right twist.

The product Δn2 · d2 of the refractive index anisotropy Δn2 of the second pattern optical anisotropic layer 18b and the thickness d2 of the second pattern optical anisotropic layer 18b measured at a wavelength of 550 nm is expressed by the following formula (4). Fulfill. That is, the values of the products Δn2 · d2 in the first retardation region (region 26b) and the second retardation region (region 30b) of the second patterned optically anisotropic layer 18b both satisfy the following formula (4). .
Formula (4) 252 nm ≦ Δn 2 · d 2 ≦ 312 nm
Especially, it is preferable to satisfy | fill Formula (4A) by the point which the effect of this invention is more excellent, and it is more preferable to satisfy Formula (4B).
Formula (4A) 262 nm ≦ Δn 2 · d 2 ≦ 302 nm
Formula (4B) 272 nm ≦ Δn 2 · d 2 ≦ 292 nm
When Δn 2 · d 2 is less than 252 nm and more than 312 nm, the tint when the retardation plate of the present invention is bonded to a display device as a circularly polarizing plate is large.
In addition, the measuring method of (DELTA) n2 * d2 is measured using the analysis software of the company using the Axoscan (polarimeter) apparatus of Axometrics.

Note that the alignment film described above may be disposed between the first pattern optical anisotropic layer 16b and the second pattern optical anisotropic layer 18b, but as in the case of the retardation plate 10a, As shown in FIG. 3, the first pattern optical anisotropic layer 16b and the second pattern optical anisotropic layer 18b are adjacent to each other, and the first pattern optical anisotropic layer 16b and the second pattern optical anisotropic layer 18b are adjacent to each other. It is preferable that substantially no alignment film is present between the two.

The materials constituting the first pattern optical anisotropic layer 16b and the second pattern optical anisotropic layer 18b are the same as the first pattern optical anisotropic layer 16a and the second pattern optical anisotropic layer 18a described above. The material which comprises is illustrated.
The method for producing the first pattern optical anisotropic layer 16b and the second pattern optical anisotropic layer 18b is not particularly limited, and the first pattern optical anisotropic layer 16a and the second pattern optical anisotropic layer described above are used. The manufacturing method of 18a is illustrated.

In FIG. 4, the case where the twist direction of the liquid crystal compound in the first pattern optical anisotropic layer 16b and the second pattern optical anisotropic layer 18b is right twist is described in detail. However, the present invention is not limited to this mode. The twist direction of the liquid crystal compound in the first pattern optical anisotropic layer 16b and the second pattern optical anisotropic layer 18b may be left twist.

<Circularly polarizing plate (also called patterned circularly polarizing plate)>
The circularly polarizing plate of the present invention includes at least the above-mentioned retardation plate (first embodiment and second embodiment) and a polarizing film. Moreover, the transparent support body may be included as needed.
The circularly polarizing plate of the present invention having the above configuration can be used for various applications in addition to being used as a polarizing plate for 3D image display devices. For example, it can be used as an adjusting light system by using two optical films. In particular, it is preferably used as a window adjustment system.

First, members (polarizing film and transparent support) used in the circularly polarizing plate will be described in detail, and then specific embodiments of the circularly polarizing plate will be described in detail.

[Polarizing film]
The polarizing film (polarizer layer) may be a member having a function of converting natural light into specific linearly polarized light, and an absorptive polarizer can be used.
The type of the polarizing film is not particularly limited, and a commonly used polarizing film can be used. For example, any of an iodine-based polarizing film, a dye-based polarizing film using a dichroic dye, and a polyene-based polarizing film Can also be used. The iodine-based polarizing film and the dye-based polarizing film are generally produced by adsorbing iodine or a dichroic dye to polyvinyl alcohol and stretching it.
In addition, it is common that a polarizing film is used as a polarizing plate by which the protective film was bonded on both surfaces.
Although the manufacturing method in particular of a circularly-polarizing plate is not restrict | limited, For example, it is preferable that the said retardation plate and polarizing film include the process of laminating | stacking continuously in a respectively elongate state. The long polarizing plate is cut according to the size of the screen of the image display device used.

[Transparent support]
A transparent support is a base material which supports the pattern optically anisotropic layer mentioned above. In the case where the patterned optically anisotropic layer itself has sufficient self-supporting property, the transparent support may not be provided. That is, the transparent support is an arbitrary constituent member.
The retardation value in the thickness direction (Rth (550)) at 550 nm of the transparent support is not particularly limited, but is preferably −110 to 110 nm, more preferably −80 to 80 nm, from the viewpoint of more excellent effects of the present invention.
The in-plane retardation value (Re (550)) at 550 nm of the transparent support is not particularly limited, but is preferably 0 to 50 nm, more preferably 0 to 30 nm, and further preferably 0 to 10 nm. preferable. The above range is preferable because light leakage of reflected light can be reduced to a level where it is not visually recognized.

As a material for forming the transparent support, a polymer excellent in optical performance transparency, mechanical strength, thermal stability, moisture shielding property, isotropy and the like is preferable. The term “transparent” means that the visible light transmittance is 60% or more, preferably 80% or more, and particularly preferably 90% or more.
Examples of the polymer film that can be used as the transparent support 12 include a cellulose acylate film (for example, a cellulose triacetate film (refractive index: 1.48), a cellulose diacetate film, a cellulose acetate butyrate film, and a cellulose acetate propionate. Film), polyolefins such as polyethylene and polypropylene, polyester resin films such as polyethylene terephthalate and polyethylene naphthalate, polyethersulfone films, polyacrylic resin films such as polymethyl methacrylate, polyurethane resin films, polyester films, polycarbonate films, Polysulfone film, polyether film, polymethylpentene film, polyether ketone film Rum, (meth) acrylonitrile film, polymer film having alicyclic structure (norbornene resin (Arton: trade name, manufactured by JSR Corporation, amorphous polyolefin (ZEONEX: trade name, manufactured by ZEON Corporation)), etc. Can be mentioned.
Among these, as a material for the polymer film, triacetyl cellulose, polyethylene terephthalate, or a polymer having an alicyclic structure is preferable, and triacetyl cellulose is particularly preferable.

The thickness of the transparent support is not particularly limited, but is preferably about 10 μm to 200 μm, more preferably 10 μm to 100 μm, and even more preferably 20 μm to 90 μm. Further, the transparent support 12 may be composed of a plurality of laminated layers. A thinner one is preferable for suppressing external light reflection, but if it is thinner than 10 μm, the strength of the film tends to be weak, which tends to be undesirable. In order to improve adhesion between the transparent support 12 and the layer provided thereon, the transparent support 12 is subjected to a surface treatment (eg, glow discharge treatment, corona discharge treatment, ultraviolet (UV) treatment, flame treatment). Also good.
Various additives (for example, an optical anisotropy adjusting agent, a wavelength dispersion adjusting agent, fine particles, a plasticizer, an ultraviolet ray preventing agent, a deterioration preventing agent, a release agent, etc.) can be added to the transparent support. Further, when the transparent support is a cellulose acylate film, the addition time may be any in the dope preparation step (preparation step of the cellulose acylate solution), but an additive is added and prepared at the end of the dope preparation step. You may perform a process.

Hereinafter, specific embodiments of the circularly polarizing plate will be described in detail.

(First embodiment)
As a first embodiment of the circularly polarizing plate, as shown in FIG. 5, the second pattern optical anisotropic layer 18a, the first pattern optical anisotropic layer 16a, the transparent support 12, and the polarizing film 32 are used. The circularly-polarizing plate 100a which has these in this order is mentioned.
In the circularly polarizing plate 100a, the relationship between the absorption axis of the polarizing film 32 and the in-plane slow axes of the first pattern optical anisotropic layer 16a and the second pattern optical anisotropic layer 18a is as shown in (a) below. Satisfy requirements.
Requirement (a): The absorption axis of the polarizing film 32 and the surface on the polarizing film 32 side in one of the first retardation region and the second retardation region of the first pattern optical anisotropic layer 16a The in-plane slow axis is parallel or orthogonal.

In the embodiment represented by the requirement (a), the absorption axis of the polarizing film 32, the in-plane slow axis of the first pattern optical anisotropic layer 16a, and the in-plane slow axis of the second pattern optical anisotropic layer 18a. The relationship with the phase axis will be described in more detail with reference to FIG.
6A shows a partially enlarged perspective cross-sectional view of a configuration in which the transparent support 16 is removed from the circularly polarizing plate 100a shown in FIG. 5 that satisfies the relationship (a). 6A, the arrow in the polarizing film 32 indicates the absorption axis, and the arrows in the first pattern optical anisotropic layer 16a and the second pattern optical anisotropic layer 18a indicate in-plane slow phases in the respective layers. Represents an axis. 6B, the in-plane slow axis of the first patterned optically anisotropic layer 16a in the first retardation region when observed from the white arrow in FIG. 6A, The relationship of an angle with the in-plane slow axis of the 2nd pattern optically anisotropic layer 18a is shown. In FIG. 6C, the in-plane slow axis of the first pattern optical anisotropic layer 16a in the second retardation region when observed from the white arrow in FIG. The relationship of an angle with the in-plane slow axis of the 2nd pattern optically anisotropic layer 18a is shown.
6 (B) and 6 (C), the rotation angle is positive in the counterclockwise direction with the absorption axis of the polarizing film 32 as the reference (0 °) when observed from the white arrow in FIG. 6 (A). Expressed with a negative angle value clockwise. Further, the twist direction is observed from the white arrow in FIG. 6A, and the right twist is based on the in-plane slow axis on the front surface (polarizing film 32 side) surface in the patterned optical anisotropic layer. Or determine the left twist.

In FIG. 6, the absorption axis of the polarizing film 32 and the in-plane slow axis on the surface 161a on the polarizing film 32 side in the first retardation region (region 24a) of the first pattern optical anisotropic layer 16a are parallel to each other. It is. The definition of parallel is as described above.

As described above, the first pattern optical anisotropic layer 16a includes a twisted liquid crystal compound having the thickness direction as a helical axis. Therefore, the in-plane slow axis on the surface 161a on the polarizing film 32 side of the first pattern optical anisotropic layer 16a and the surface on the second pattern optical anisotropic layer 18a side of the first pattern optical anisotropic layer 16a. The in-plane slow axis at 162a forms the above-described twist angle (26.5 ° in FIG. 6). That is, the in-plane slow axis of the first pattern optically anisotropic layer 16a rotates by −26.5 ° (26.5 ° clockwise).
Therefore, with reference to the absorption axis of the polarizing film 32, the in-plane slow axis at the surface 162a of the first patterned optically anisotropic layer 16a is located at −26.5 ° in the first retardation region, In the retardation region, the in-plane slow axis at the surface 162a of the first pattern optical anisotropic layer 16a is located at -116.5 °.
In FIG. 6, the in-plane slow axes at the surface 162a of the first patterned optically anisotropic layer 16a in the first retardation region and the second retardation region are −26.5 ° and −116.5 °, respectively. Although an embodiment in a position is shown, the present invention is not limited to this embodiment, and may be in the range of −26.5 ± 10 ° and −116.5 ± 10 °, respectively.

In FIG. 6, the in-plane slow axis at the surface 162a on the second pattern optical anisotropic layer 18a side of the first pattern optical anisotropic layer 16a and the first pattern of the second pattern optical anisotropic layer 18a. The in-plane slow axis on the surface 181a on the optically anisotropic layer 16a side is parallel to both the first retardation region and the second retardation region.

As described above, the second pattern optical anisotropic layer 18a includes a twisted liquid crystal compound having a thickness direction as a helical axis. Therefore, the in-plane slow axis at the surface 181a on the polarizing film 32 side of the second pattern optical anisotropic layer 18a and the first pattern optical anisotropic layer 16a side of the second pattern optical anisotropic layer 18a are The in-plane slow axis on the opposite surface 182a forms the above-described twist angle (78.6 ° in FIG. 6). That is, the in-plane slow axis of the second patterned optically anisotropic layer 18a rotates by −78.6 ° (clockwise 78.6 °).
Therefore, with reference to the absorption axis of the polarizing film 32, the in-plane slow axis on the surface 182a of the second patterned optically anisotropic layer 18a is located at −105.1 ° in the first retardation region, In the retardation region, the in-plane slow axis at the surface 182a of the second patterned optically anisotropic layer 18a is located at -195.1 °.
In FIG. 6, the in-plane slow axes on the surface 182a of the second patterned optically anisotropic layer 18a in the first retardation region and the second retardation region are −105.1 ° and −195.1 °. Although an embodiment in a position is shown, the present invention is not limited to this embodiment, and may be in a range of −105.1 ± 20 ° and −195.1 ± 20 °, respectively.

In FIG. 6, the absorption axis of the polarizing film 32 and the in-plane slow axis on the surface 161a on the polarizing film 32 side in the first retardation region (region 24a) of the first pattern optical anisotropic layer 16a are parallel to each other. Although the aspect which is is explained in full detail, it may be orthogonal.
In FIG. 6, the liquid crystal compound in the first pattern optical anisotropic layer 16a and the second pattern optical anisotropic layer 18a is described in detail as to the clockwise direction (right twist). It may be a surrounding aspect. More specifically, the in-plane slow axis at the surface 162a in the first retardation region of the first pattern optical anisotropic layer 16a is 26.5 ± 10 ° with reference to the absorption axis of the polarizing film 32. And the in-plane slow axis at the surface 162a in the second retardation region of the first pattern optical anisotropic layer 16a is at a position of 116.5 ± 10 °, and the second pattern optical anisotropic layer The in-plane slow axis at the surface 182a in the first retardation region 18a is at a position of 105.1 ± 20 °, and the surface 182a in the second retardation region of the second patterned optically anisotropic layer 18a The in-plane slow axis may be at a position of 195.1 ± 20 °.

In the circularly polarizing plate 100a in FIG. 5, when the first pattern optical anisotropic layer 16a contains a discotic liquid crystal compound and the second pattern optical anisotropic layer 18a also contains a discotic liquid crystal compound, a transparent support Rth (550) is preferably −30 nm to −10 nm, more preferably −25 nm to −10 nm in that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to a display device is smaller. More preferably, it is −15 nm.

In the circularly polarizing plate 100a, when the first pattern optical anisotropic layer 16a contains a rod-like liquid crystal compound and the second pattern optical anisotropic layer 18a contains a discotic liquid crystal compound, Rth (550) of the transparent support. Is preferably −70 nm to −50 nm, and preferably −75 nm to −65 nm in that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to the display device is smaller. Is more preferable.

In the circularly polarizing plate 100a, when the first pattern optical anisotropic layer 16a contains a discotic liquid crystal compound and the second pattern optical anisotropic layer 18a contains a rod-like liquid crystal compound, Rth (550) of the transparent support. Is preferably 50 nm to 70 nm, and more preferably 55 nm to 65 nm in that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to the display device is smaller.

In the circularly polarizing plate 100a, when the first pattern optical anisotropic layer 16a contains a rod-like liquid crystal compound and the second pattern optical anisotropic layer 18a also contains a rod-like liquid crystal compound, Rth (550) of the transparent support is From the viewpoint of less difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to a display device, the thickness is preferably 30 nm to 50 nm, and more preferably 35 nm to 45 nm.

(Second Embodiment)
As a second embodiment of the circularly polarizing plate, as shown in FIG. 7, the transparent support 12, the second pattern optical anisotropic layer 18a, the first pattern optical anisotropic layer 16a, and the polarizing film 32 are used. The circularly-polarizing plate 100b which has these in this order is mentioned.
The circularly polarizing plate 100b shown in FIG. 7 and the circularly polarizing plate 100a shown in FIG. 5 are the same except for the position of the transparent support 12.
In the circularly polarizing plate 100b, like the circularly polarizing plate 100a, the relationship between the absorption axis of the polarizing film 32 and the in-plane slow axis of the first patterned optically anisotropic layer 16a satisfies the requirement (a). Fulfill.

In the circularly polarizing plate 100b, when the first pattern optical anisotropic layer 16a contains a discotic liquid crystal compound and the second pattern optical anisotropic layer 18a also contains a discotic liquid crystal compound, Rth (550) of the transparent support. ) Is preferably 70 nm to 90 nm, more preferably 75 nm to 85 nm, in that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to a display device is smaller. .

In the circularly polarizing plate 100b, when the first pattern optical anisotropic layer 16a contains a rod-like liquid crystal compound and the second pattern optical anisotropic layer 18a contains a discotic liquid crystal compound, Rth (550) of the transparent support. Is preferably 30 nm to 50 nm, more preferably 35 nm to 45 nm, in that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to the display device is smaller.

In the circularly polarizing plate 100b, when the first pattern optical anisotropic layer 16a contains a discotic liquid crystal compound and the second pattern optical anisotropic layer 18a contains a rod-like liquid crystal compound, Rth (550) of the transparent support. Is preferably −70 nm to −50 nm, and preferably −65 nm to −55 nm in that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to the display device is smaller. Is more preferable.

In the circularly polarizing plate 100b, when the first pattern optical anisotropic layer 16a contains a rod-like liquid crystal compound and the second pattern optical anisotropic layer 18a also contains a rod-like liquid crystal compound, Rth (550) of the transparent support is From the viewpoint that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to the display device is smaller, it is preferably −70 nm to −50 nm, and preferably −65 nm to −55 nm. More preferred.

(Third embodiment)
As a third embodiment of the circularly polarizing plate, as shown in FIG. 8, the second pattern optical anisotropic layer 18b, the first pattern optical anisotropic layer 16b, the transparent support 12, and the polarizing film 32 are used. The circularly-polarizing plate 100c which has these in this order is mentioned.
In the circularly polarizing plate 100c, the relationship between the absorption axis of the polarizing film 32 and the in-plane slow axes of the first pattern optical anisotropic layer 16b and the second pattern optical anisotropic layer 18b is as shown in (b) below. Satisfy requirements.
Requirement (b): On the surface on the polarizing film 32 side in one of the first retardation region and the second retardation region of the first pattern optical anisotropic layer 16b and the absorption axis of the polarizing film 32 The in-plane slow axis is parallel or orthogonal.

In the embodiment represented by the above requirement (b), the absorption axis of the polarizing film 32, the in-plane slow axis of the first pattern optical anisotropic layer 16b, and the in-plane slow axis of the second pattern optical anisotropic layer 18b. The relationship with the phase axis will be described in more detail with reference to FIG.
9A shows a partially enlarged perspective cross-sectional view of a configuration in which the transparent support 12 is removed from the circularly polarizing plate 100c shown in FIG. In FIG. 9A, the arrow in the polarizing film 32 indicates the absorption axis, and the arrows in the first pattern optical anisotropic layer 16b and the second pattern optical anisotropic layer 18b indicate in-plane slow phases in the respective layers. Represents an axis. 9B, the in-plane slow axis of the first patterned optically anisotropic layer 16b in the first retardation region when observed from the white arrow in FIG. 9A, The relationship of an angle with the in-plane slow axis of the 2nd pattern optically anisotropic layer 18b is shown. 9C, the in-plane slow axis of the first pattern optical anisotropic layer 16b in the second retardation region when observed from the white arrow in FIG. 9A, The relationship of an angle with the in-plane slow axis of the 2nd pattern optically anisotropic layer 18b is shown.
9B and 9C, the rotation angle is positive in the counterclockwise direction with the absorption axis of the polarizing film 32 as the reference (0 °) when observed from the white arrow in FIG. 9A. Expressed with a negative angle value clockwise. Further, the twist direction is observed from the white arrow in FIG. 9A, and the right twist is based on the in-plane slow axis on the front side (polarizing film 32 side) surface in the patterned optical anisotropic layer. Or determine the left twist.

In FIG. 9, the absorption axis of the polarizing film 32 and the in-plane slow axis on the surface 161b on the polarizing film 32 side in the first retardation region (region 24b) of the first pattern optical anisotropic layer 16b are parallel to each other. It is. The definition of parallel is as described above.

As described above, the first pattern optical anisotropic layer 16b includes a twist-aligned liquid crystal compound having the thickness direction as a helical axis. Therefore, the in-plane slow axis on the surface 161b on the polarizing film 32 side of the first pattern optical anisotropic layer 16b and the surface on the second pattern optical anisotropic layer 18b side of the first pattern optical anisotropic layer 16b. The in-plane slow axis at 162b forms the twist angle described above (59.7 ° in FIG. 9). That is, the in-plane slow axis of the first patterned optically anisotropic layer 16a rotates by −59.7 ° (clockwise 59.7 °).
Therefore, with reference to the absorption axis of the polarizing film 32, the in-plane slow axis at the surface 162b of the first patterned optically anisotropic layer 16b is located at −59.7 ° in the first retardation region, In the retardation region, the in-plane slow axis at the surface 162b of the first patterned optically anisotropic layer 16b is located at -149.7 °.
In FIG. 9, the in-plane slow axes on the surface 162b of the first pattern optical anisotropic layer 16b in the first retardation region and the second retardation region are −59.7 ° and −149.7 °, respectively. Although an embodiment in a position is shown, the present invention is not limited to this embodiment, and may be in the range of −59.7 ± 10 ° and −149.7 ± 10 °, respectively.

In FIG. 9, the in-plane slow axis at the surface 162b on the second pattern optical anisotropic layer 18b side of the first pattern optical anisotropic layer 16b and the first pattern of the second pattern optical anisotropic layer 18b. The in-plane slow axis on the surface 181b on the optically anisotropic layer 16b side is orthogonal to both the first retardation region and the second retardation region.
Therefore, in FIG. 9, the in-plane slow axes at the surface 181b of the second patterned optically anisotropic layer 18b in the first retardation region and the second retardation region are −149.7 ° and −239.7, respectively. In the position of °.

As described above, the second pattern optical anisotropic layer 18b includes a twisted liquid crystal compound having a thickness direction as a helical axis. Therefore, the in-plane slow axis on the surface 181b of the second pattern optical anisotropic layer 18b on the polarizing film 32 side and the first pattern optical anisotropic layer 16b side of the second pattern optical anisotropic layer 18b are The in-plane slow axis on the opposite surface 182b forms the above-described twist angle (127.6 ° in FIG. 9). That is, the in-plane slow axis of the second patterned optically anisotropic layer 18b rotates by −127.6 ° (127.6 ° clockwise).
Therefore, with reference to the absorption axis of the polarizing film 32, the in-plane slow axis at the surface 182b of the second patterned optically anisotropic layer 18b is located at −277.3 ° in the first retardation region, In the retardation region, the in-plane slow axis at the surface 182b of the second patterned optically anisotropic layer 18b is located at −367.3 °.
In FIG. 6, the in-plane slow axes at the surface 182b of the second patterned optical anisotropic layer 18b in the first retardation region and the second retardation region are −277.3 ° and −367.3 °. Although an embodiment in a position is shown, the present invention is not limited to this embodiment, and may be in a range of −277.3 ± 20 ° and −367.3 ± 20 °, respectively.

In FIG. 9, the absorption axis of the polarizing film 32 and the in-plane slow axis on the surface 161b on the polarizing film 32 side in the first retardation region (region 24b) of the first patterned optically anisotropic layer 16b are parallel to each other. Although the aspect which is is explained in full detail, it may be orthogonal.
In FIG. 9, the mode in which the twist direction of the liquid crystal compound in the first pattern optical anisotropic layer 16b and the second pattern optical anisotropic layer 18b is clockwise (right twist) is described in detail. It may be a surrounding aspect. More specifically, the in-plane slow axis at the surface 162b in the first retardation region of the first pattern optical anisotropic layer 16b is 59.7 ± 10 ° with respect to the absorption axis of the polarizing film 32. And the in-plane slow axis at the surface 162b in the second retardation region of the first pattern optical anisotropic layer 16a is at a position of 149.7 ± 10 °, and the second pattern optical anisotropic layer The in-plane slow axis on the surface 182b in the first retardation region 18b is at a position of 277.3 ± 20 °, and the surface 182b in the second retardation region of the second patterned optically anisotropic layer 18b The in-plane slow axis may be at a position of 367.3 ± 20 °.

In the circularly polarizing plate 100c, when the first pattern optical anisotropic layer 16b contains a discotic liquid crystal compound and the second pattern optical anisotropic layer 18b also contains a discotic liquid crystal compound, Rth (550) of the transparent support. ) Is preferably 50 nm to 70 nm, more preferably 55 nm to 65 nm in that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to a display device is smaller. .

In the circularly polarizing plate 100c, when the first pattern optical anisotropic layer 16b contains a discotic liquid crystal compound and the second pattern optical anisotropic layer 18b contains a rod-like liquid crystal compound, Rth (550) of the transparent support. Is preferably −70 nm to −50 nm, and preferably −65 nm to −55 nm in that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to the display device is smaller. Is more preferable.

In the circularly polarizing plate 100c, when the first pattern optical anisotropic layer 16b contains a rod-like liquid crystal compound and the second pattern optical anisotropic layer 18b contains a discotic liquid crystal compound, Rth (550) of the transparent support. Is preferably 50 nm to 70 nm, and more preferably 55 nm to 65 nm in that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to the display device is smaller.

In the circularly polarizing plate 100c, when the first pattern optical anisotropic layer 16b contains a rod-like liquid crystal compound and the second pattern optical anisotropic layer 18b also contains a rod-like liquid crystal compound, Rth (550) of the transparent support is From the viewpoint that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to the display device is smaller, it is preferably −70 nm to −50 nm, and preferably −65 nm to −55 nm. More preferred.

(Fourth embodiment)
As a fourth embodiment of the circularly polarizing plate, as shown in FIG. 10, the transparent support 12, the second pattern optical anisotropic layer 18b, the first pattern optical anisotropic layer 16b, and the polarizing film 32 are used. The circularly-polarizing plate 100d which has these in this order is mentioned.
The circularly polarizing plate 100d shown in FIG. 10 and the circularly polarizing plate 100c shown in FIG. 8 are the same except for the position of the transparent support 12.
In the circularly polarizing plate 100d, similarly to the circularly polarizing plate 100c, the absorption axis of the polarizing film 32 and the in-plane slow axes of the first patterned optically anisotropic layer 16b and the second patterned optically anisotropic layer 18b. The relationship satisfies the requirement (b) above.

In the circularly polarizing plate 100d, when the first pattern optical anisotropic layer 16b contains a discotic liquid crystal compound and the second pattern optical anisotropic layer 18b also contains a discotic liquid crystal compound, Rth (550) of the transparent support. ) Is preferably 50 nm to 70 nm, more preferably 55 nm to 65 nm in that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to a display device is smaller. .

In the circularly polarizing plate 100d, when the first pattern optical anisotropic layer 16b contains a discotic liquid crystal compound and the second pattern optical anisotropic layer 18b contains a rod-like liquid crystal compound, Rth (550) of the transparent support. Is preferably 70 nm to 90 nm, more preferably 75 nm to 85 nm, in that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to a display device is smaller.

In the circularly polarizing plate 100d, when the first pattern optical anisotropic layer 16b contains a rod-like liquid crystal compound and the second pattern optical anisotropic layer 18b contains a discotic liquid crystal compound, Rth (550) of the transparent support. Is preferably −110 nm to −90 nm, and preferably −105 nm to −95 nm in that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to the display device is smaller. Is more preferable.

In the circularly polarizing plate 100d, when the first pattern optical anisotropic layer 16b contains a rod-like liquid crystal compound and the second pattern optical anisotropic layer 18b also contains a rod-like liquid crystal compound, Rth (550) of the transparent support is From the viewpoint that the difference in visibility between the front direction and the oblique direction when the circularly polarizing plate is bonded to the display device is smaller, it is preferably −90 nm to −70 nm, and preferably −85 nm to −75 nm. More preferred.

<3D image display device, 3D image display system>
The retardation plate and the circularly polarizing plate described above can be suitably used for a 3D image display device and a 3D image display system. More specifically, by arranging the above-described retardation plate or circularly polarizing plate on the viewing side of the display panel driven based on the image signal, the first retardation region of the light from the display panel is The polarization state of the light that has passed through and the light that has passed through the second phase difference region can be changed, and the video display panel can display a 3D stereoscopic video display.

Hereinafter, the features of the present invention will be described more specifically with reference to examples and comparative 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 specific examples shown below.

<Preparation of transparent support (hereinafter also referred to simply as support)>
<< Preparation of cellulose acylate film with Rth of -80 nm to -30 nm >>
(Preparation of cellulose acylate)
A cellulose acylate having a total substitution degree of 2.97 (breakdown: acetyl substitution degree: 0.45, propionyl substitution degree: 2.52) was prepared. As a catalyst, a mixture of sulfuric acid (7.8 parts by mass with respect to 100 parts by mass of cellulose) and carboxylic acid anhydride was cooled to −20 ° C., added to cellulose derived from pulp, and acylated at 40 ° C. At this time, the kind of acyl group and its substitution ratio were adjusted by adjusting the kind and amount of carboxylic anhydride. After acylation, aging was performed at 40 ° C. to adjust the total substitution degree.

(Preparation of cellulose acylate solution)
1) Cellulose acylate The prepared cellulose acylate was heated to 120 ° C. and dried to adjust the water content to 0.5% by mass or less, and then 30 parts by mass was mixed with a solvent.
2) Solvent Dichloromethane / methanol / butanol (81/15/4 parts by mass) was used as a solvent. The water content of these solvents was 0.2% by mass or less.
3) Additive In preparing all the solutions, 0.9 parts by mass of trimethylolpropane triacetate was added. In addition, 0.25 part by mass of silicon dioxide fine particles (particle diameter 20 nm, Mohs hardness about 7) was added in preparing all solutions.
4) Swelling and dissolution The cellulose acylate was gradually added to the 400 liter stainless steel dissolution tank having stirring blades and circulating cooling water around the outer periphery, while stirring and dispersing the solvent and additives. . After completion of the addition, the mixture was stirred at room temperature for 2 hours, swollen for 3 hours and then stirred again to obtain a cellulose acylate solution.
For stirring, a dissolver type eccentric stirring shaft that stirs at a peripheral speed of 15 m / sec (shear stress 5 × 10 ⁴ kgf / m / sec ² ) and an anchor blade on the central axis and a peripheral speed of 1 m / sec. A stirring shaft that stirs at a sec (shear stress of 1 × 10 ⁴ kgf / m / sec ² ) was used. Swelling was performed with the high speed stirring shaft stopped and the peripheral speed of the stirring shaft having the anchor blades set at 0.5 m / sec.
5) Filtration The cellulose acylate solution obtained above was filtered through a filter paper (# 63, manufactured by Toyo Filter Paper Co., Ltd.) with an absolute filtration accuracy of 0.01 mm, and further a filter paper (FH025, Poll) with an absolute filtration accuracy of 2.5 μm. To obtain a cellulose acylate solution.

(Preparation of cellulose acylate film)
The cellulose acylate solution was heated to 30 ° C., and cast on a mirror surface stainless steel support having a band length of 60 m set at 15 ° C. through a casting Giesser (described in JP-A-11-314233). The casting speed was 15 m / min and the coating width was 200 cm. The space temperature of the entire casting part was set to 15 ° C. Then, the cellulose acylate film that had been cast and rotated 50 cm before the cast part was peeled off from the band, and 45 ° C. dry air was blown. Next, it was dried at 110 ° C. for 5 minutes and further at 140 ° C. for 10 minutes to obtain a cellulose acylate film. The film thickness was adjusted to 30 μm to 100 μm, and various cellulose acylate films having Re (550) of 5 nm or less and Rth (550) of −80 nm to −30 nm were obtained.

<< Production of cellulose acylate film with Rth of -30 nm to 5 nm >>
(Preparation of cellulose acylate solution)
The following composition was put into a mixing tank and stirred to dissolve each component to prepare a cellulose acylate solution.
Cellulose acylate solution Composition Cellulose acylate having an acetylation degree of 2.86 100.0 parts by mass Methylene chloride (first solvent) 402.0 parts by mass Methanol (second solvent) 60.0 parts by mass

(Preparation of additive solution)
The following composition was put into a mixing tank and stirred while heating to dissolve each component to prepare a cellulose acylate solution. The following compounds (optical anisotropy reducing agents) and wavelength dispersion adjusting agents for reducing optical anisotropy were used.

Composition of additive solution Compound A-19 (retardation reducing agent) 49.3 parts by mass UV-102 (wavelength dispersion adjusting agent) 7.6 parts by mass Methylene chloride (first solvent) 58.4 parts by mass Methanol (second solvent) 8.7 parts by mass Cellulose acylate solution 12.8 parts by mass

(Preparation of cellulose acylate film)
94.6 parts by mass of the cellulose acylate solution and 4.1 parts by mass of the additive solution were mixed after filtration, and cast using a band casting machine. The total amount of the additive compounds (Compound A-19 and UV-102) was 13.6% by mass relative to the amount of cellulose acylate.
The film was peeled from the band with a residual solvent amount of 30% and dried at 140 ° C. for 40 minutes to obtain a cellulose acylate film. The film thickness was adjusted to 30 μm to 100 μm, and various cellulose acylate films having Re (550) of 5 nm or less and Rth (550) of −30 nm to 5 nm were obtained.

<< Production of cellulose acylate film having Rth of 5 nm to 45 nm >>
(Preparation of cellulose acylate solution)
The following composition was put into a mixing tank and stirred to dissolve each component to prepare a cellulose acylate solution.
Cellulose acylate solution composition Cellulose acylate having an acetylation degree of 2.86 100.0 parts by mass Triphenyl phosphate (plasticizer) 7.8 parts by mass Biphenyl diphenyl phosphate (plasticizer) 3.9 parts by mass Methylene chloride 435 parts by mass Methanol 65 parts by mass

(Preparation of cellulose acylate film)
The cellulose acylate solution produced by the above method was uniformly cast on a stainless steel band support. On the stainless steel band support, the solvent was evaporated until the residual solvent amount was 30% by mass, and then peeled off from the stainless steel band. When peeling, the film was stretched so that the longitudinal (MD) stretch ratio was 1.02, and then dried at 140 ° C. for 40 minutes while being transported in a drying zone to obtain a cellulose acylate film. The film thickness was adjusted to 30 μm to 100 μm, and various cellulose acylate films having Re (550) of 5 nm or less and Rth (550) of 5 nm to 45 nm were obtained.

<< Production of cellulose acylate film having Rth of 45 nm to 100 nm >>
(Preparation of cellulose acylate solution)
The following composition was put into a mixing tank and stirred while heating to dissolve each component to prepare a cellulose acylate solution.
(Cellulose acylate solution composition)
Cellulose acylate having an acetylation degree of 60.7 to 61.1% 100 parts by weight Triphenyl phosphate (plasticizer) 7.8 parts by weight Biphenyl diphenyl phosphate (plasticizer) 3.9 parts by weight Methylene chloride (first solvent) 336 Part by mass Methanol (second solvent) 29 parts by mass 1-butanol (third solvent) 11 parts by mass

In another mixing tank, 16 parts by mass of the following retardation increasing agent (A), 92 parts by mass of methylene chloride and 8 parts by mass of methanol were added and stirred while heating to prepare a retardation increasing agent solution. A dope was prepared by mixing 474 parts by mass of the cellulose acylate solution with 25 parts by mass of the retardation increasing agent solution and thoroughly stirring. The addition amount of the retardation increasing agent was 6.0 parts by mass with respect to 100 parts by mass of cellulose acylate.

The obtained dope was cast using a band stretching machine. After the film surface temperature on the band reached 40 ° C., the film was dried with warm air at 70 ° C. for 1 minute, and the film from the band was dried with 140 ° C. drying air for 10 minutes to obtain a cellulose acylate film. The film thickness was adjusted to 30 μm to 100 μm, and various cellulose acylate films having Re (550) of 5 nm or less and Rth (550) of 45 nm to 100 nm were obtained.

<< Preparation of cellulose acylate film with Rth of -100 nm >>
A cellulose acylate film was produced according to the same procedure except that no stretching was performed in Example 15 of JP-A-2006-265309. When Re and Rth were measured, Re (550) = 0 nm and Rth (550) = − 100 nm.

The following shows the types of transparent supports used.

<Example 1>
(Alkaline saponification treatment)
After passing the support 4 through a dielectric heating roll having a temperature of 60 ° C. and raising the film surface temperature to 40 ° C., an alkaline solution having the composition shown below is applied to the band surface of the film using a bar coater. It was transported for 10 seconds under a steam far infrared heater manufactured by Noritake Co., Ltd., which was applied at / m ² and heated to 110 ° C. Subsequently, 3 ml / m ^{2 of} pure water was applied using the same bar coater. Next, washing with a fountain coater and draining with an air knife were repeated three times, and then the sheet was transported to a drying zone at 70 ° C. for 10 seconds and dried to prepare an alkali saponified cellulose acylate film.

(Alkaline solution composition)
──────────────────────────────
Alkaline solution composition (parts by mass)
──────────────────────────────
Potassium hydroxide 4.7 parts by weight Water 15.8 parts by weight Isopropanol 63.7 parts by weight Surfactant SF-1: C ₁₄ H ₂₉ O (CH ₂ CH ₂ O) ₂₀ H 1.0 part by weight Propylene glycol 14. 8 parts by mass ──────────────────────────────

(Formation of alignment film 1)
To the long cellulose acylate film saponified as described above, the alignment film coating solution 1 having the following composition was prepared, filtered with a polypropylene filter having a pore size of 0.2 μm, and then continuously with a # 8 wire bar. Was applied. The film was dried with warm air of 100 ° C. for 2 minutes to obtain an alignment film 1 having a thickness of 0.6 μm.
Next, a lattice mask in which openings and non-openings of 5 mm × 282 μm square are periodically formed with a pitch of 564 μm is used so that the repeating direction of the openings and non-openings is perpendicular to the film longitudinal direction. 1 is radiated onto the alignment film using an air-cooled metal halide lamp (made by Eye Graphics Co., Ltd.) having an illuminance of 2.5 mW / cm ² in the UV-C region under room temperature air. Then, the UV irradiation part and the non-irradiation part were formed periodically. Thereafter, a rubbing treatment was continuously performed. At this time, the longitudinal direction of the long film and the transport direction were parallel, and the rubbing direction with respect to the film longitudinal direction was adjusted to 0 °.
The angle in the rubbing direction is determined by observing the support from the side on which the optically anisotropic layer, which will be described later, is laminated. The longitudinal direction of the support is 0 ° as a reference, and the counterclockwise direction is positive or clockwise. Is represented with a negative angle value.

Composition of alignment film coating solution 1 ――――――――――――――――――――――――――――――
4 parts by weight of the following modified polyvinyl alcohol The following photoacid generator 0.1 part by weight 70 parts by weight of methanol 30 parts by weight of methanol ――――――――――――――――――――――― ―――――――

(Formation of patterned optically anisotropic layer A (hereinafter also simply referred to as “optically anisotropic layer A”))
Next, a coating liquid (DLC (1)) containing a discotic liquid crystal compound shown in Table 2 was applied onto the alignment film 1 produced above with a # 3 wire bar. The conveyance speed (V) of the film was 5 m / min. In order to dry the solvent of the coating solution and to mature the alignment of the discotic liquid crystal compound, the coating liquid was heated with hot air at 110 ° C. for 2 minutes. Subsequently, UV irradiation (500 mJ / cm ² ) was performed at 80 ° C. in a nitrogen environment to fix the alignment of the liquid crystal compound. In the lattice mask exposure portion (first retardation region) of the alignment film 1, the discotic liquid crystal is vertically aligned with the slow axis direction parallel to the rubbing direction, and the unexposed portion (second retardation region) is rubbed. The slow axis direction was perpendicular to the direction perpendicular to the direction. The thickness of the optically anisotropic layer A was 1.25 μm in both the exposed area and the unexposed area. In addition, Δnd at 550 nm was 282 nm in any region.

(Formation of patterned optically anisotropic layer B (hereinafter also simply referred to as “optically anisotropic layer B”))
Without subjecting the optically anisotropic layer A prepared above to a rubbing treatment, a coating liquid (DLC (4)) containing a discotic liquid crystal compound shown in Table 2 was applied onto the optically anisotropic layer A prepared above # 3 was applied with a wire bar. The conveyance speed (V) of the film was 5 m / min. In order to dry the solvent of the coating solution and to mature the alignment of the discotic liquid crystal compound, the coating liquid was heated with hot air at 110 ° C. for 2 minutes. Subsequently, UV irradiation (500 mJ / cm ² ) was performed at 80 ° C. in a nitrogen environment to fix the alignment of the liquid crystal compound. The thickness of the optically anisotropic layer B was 1.19 μm in both the first retardation region and the second retardation region. Further, Δnd at 550 nm was 140 nm.
The in-plane slow axis of the surface of the optically anisotropic layer B on the optically anisotropic layer A side is the optical axis of each optically anisotropic layer A in both the first retardation region and the second retardation region. It was parallel to the in-plane slow axis on the surface of the anisotropic layer B side. The twist angle of the discotic liquid crystal compound in the optically anisotropic layer A is 26.5 ° in both the first retardation region and the second retardation region, and the discotic liquid crystal compound in the optically anisotropic layer B The twist angle was 78.6 ° in both the first phase difference region and the second phase difference region. The discotic liquid crystal compound forms a twisted structure clockwise.
Further, here, the twisted structure of the discotic liquid crystal compound is obtained by observing the support from the surface side on which the optically anisotropic layer is laminated, and on the side opposite to the optically anisotropic layer A side of the optically anisotropic layer B. Whether the in-plane slow axis is clockwise or counterclockwise is determined based on the in-plane slow axis of the surface.

(Preparation of polarizing film)
A polyvinyl alcohol (PVA) film having a thickness of 80 μm is dyed by immersing it in an aqueous iodine solution having an iodine concentration of 0.05% by mass at 30 ° C. for 60 seconds, and then in an aqueous boric acid solution having a boric acid concentration of 4% by mass. The film was vertically stretched to 5 times the original length while being immersed for 2 seconds, and then dried at 50 ° C. for 4 minutes to obtain a polarizing film having a thickness of 20 μm.

(Preparation of polarizing film protective film)
A commercially available cellulose acylate film “TD80UL” (manufactured by FUJIFILM Corporation) was prepared, immersed in an aqueous sodium hydroxide solution at 55 ° C. at 1.5 mol / liter, and then thoroughly washed with water. . Then, after being immersed in a diluted sulfuric acid aqueous solution at 35 ° C. at 0.005 mol / liter for 1 minute, it was immersed in water to sufficiently wash away the diluted sulfuric acid aqueous solution. Finally, the sample was thoroughly dried at 120 ° C.

(Preparation of patterned circularly polarizing plate)
On the exposed surface of the support of the retardation plate comprising the support prepared above, the optically anisotropic layer A, and the optically anisotropic layer B, the above polarizing film and the above polarizing film protective film are coated with polyvinyl alcohol. A long patterned circularly polarizing plate (P-1) was produced by continuous bonding using a system adhesive. That is, the patterned circularly polarizing plate (P-1) includes a polarizing film protective film, a polarizing film, a transparent support, an optically anisotropic layer A (corresponding to the second patterned optically anisotropic layer), an optically anisotropic layer. B (corresponding to the first pattern optically anisotropic layer) in this order, and the order of the polarizing film, the transparent support, the optically anisotropic layer A, and the optically anisotropic layer B is as shown in FIG. It corresponds to an aspect.
The absorption axis of the polarizing film coincides with the longitudinal direction of the circularly polarizing plate, and the optical anisotropic layer B of the optical anisotropic layer A in the first retardation region is based on the absorption axis of the polarizing film. The in-plane slow axis on the side surface is at a position of −26.5 °, and the in-plane slow axis of the surface of the optically anisotropic layer B opposite to the optically anisotropic layer A is −105.1. In the position of °. Further, the in-plane slow axis of the optically anisotropic layer A on the surface of the optically anisotropic layer B in the second retardation region is at a position of −116.5 °, and the optically anisotropic layer B has an optically different axis. The in-plane slow axis of the surface opposite to the isotropic layer A is at a position of -195.1 °.
The rotation angle of the in-plane slow axis is determined by observing the retardation plate (the optically anisotropic layer A and the optically anisotropic layer B) from the polarizing film side and taking the absorption axis of the polarizing film as a reference. Expressed with a positive angle in the clockwise direction and a negative angle value in the clockwise direction.

<Example 2>
(Formation of orientation underlayer)
An alignment base coating solution having the following composition was prepared on a saponified long support 3, filtered with a polypropylene filter having a pore size of 0.2 μm, and then continuously applied with a # 8 wire bar. The film was dried for 2 minutes with warm air at 100 ° C. to obtain a film having a thickness of 0.6 μm.

Composition of alignment primer coating solution ――――――――――――――――――――――――――――――
The following modified polyvinyl alcohol 4 parts by weight water 70 parts by weight Methanol 30 parts by weight ――――――――――――――――――――――――――――――

(Formation of alignment film 2)
Further, an alignment film coating solution having the following composition was prepared and continuously coated with a # 8 wire bar. The alignment film 2 having a thickness of 0.15 μm was obtained by drying with warm air of 100 ° C. for 2 minutes.
Next, a lattice mask in which openings and non-openings of 5 mm × 282 μm are periodically formed at a pitch of 564 μm is used, and an alignment layer is formed so that the repeating direction of the openings and non-openings is perpendicular to the film longitudinal direction. Two pieces were placed on 2 at an interval of 1 m in the longitudinal direction of the film. At this time, the arrangement of one mask is shifted in the direction perpendicular to the longitudinal direction of the 282 μm film with respect to the other, and the exposure area of the first mask is changed to the light-shielding area of the second mask. The light shielding area is set to be the exposure area of the second mask. Further, a polarizing plate is arranged between each lattice mask and the UV lamp, and polarized ultraviolet rays are applied to the alignment film 2 using an air-cooled metal halide lamp having an illuminance of 2.5 mW / cm ² in the UV-C region under air at room temperature. Irradiated. At this time, in the first mask, the polarizing transmission axis direction of the polarizing plate with respect to the longitudinal direction of the film is 0 °, and in the second mask, the polarizing transmission axis direction of the polarizing plate with respect to the longitudinal direction of the film is 90 °. The polarization transmission direction of was adjusted. Under such a mask, the film was continuously conveyed in the longitudinal direction at a speed of 1 m / min, and the film was continuously irradiated with ultraviolet rays.
The angle in the direction of the polarization transmission axis is determined by observing the support from the side on which the optically anisotropic layer to be described later is laminated, the longitudinal direction of the support is 0 ° as a reference, and is positive in the counterclockwise direction. It is represented with a negative angle value in the clockwise direction.

Composition of coating solution for photo-alignment film ――――――――――――――――――――――――――――――
The following compounds 1 part by mass Tetrahydrofuran 100 parts by mass ――――――――――――――――――――――――――――――

(Formation of optically anisotropic layer A)
Next, the coating liquid (RLC (1)) containing the rod-shaped liquid crystal compound shown in Table 2 was applied onto the alignment film 2 produced above with a # 3 wire bar. The conveyance speed (V) of the film was 5 m / min. In order to dry the solvent of the coating solution and to mature the alignment of the rod-like liquid crystal compound, it was heated with hot air at 100 ° C. for 2 minutes. Subsequently, UV irradiation (500 mJ / cm ² ) was performed at 80 ° C. in a normal atmospheric environment to fix the alignment of the liquid crystal compound. In the exposure portion (first retardation region) where the polarized light irradiation direction of the alignment film is 0 °, the rod-like liquid crystal compound is horizontally aligned with the slow axis direction parallel to the polarized light irradiation direction, and the polarized light irradiation direction is 90 °. In the portion (second retardation region), the rod-like liquid crystal compound was horizontally aligned with the slow axis direction parallel to the polarization irradiation direction.

Subsequently, when manufacturing the optically anisotropic layer B, a patterned circularly polarizing plate (P-2) was manufactured according to the same procedure as in Example 1.
The relationship between the angle between the absorption axis of the polarizing film in the patterned circularly polarizing plate (P-2) and the in-plane slow axes of the optically anisotropic layer A and the optically anisotropic layer B is as follows. It was the same as the plate (P-1).

<Example 3>
According to the same procedure as in Example 1, except that the support 6 was used instead of the support 4 and RLC (2) was used instead of DLC (4) in the production of the optically anisotropic layer B. A circularly polarizing plate (P-3) was produced.
The relationship between the angle between the absorption axis of the polarizing film in the patterned circularly polarizing plate (P-3) and the in-plane slow axes of the optically anisotropic layer A and the optically anisotropic layer B is as follows. It was the same as the plate (P-1).

<Example 4>
According to the same procedure as in Example 2, except that the support 5 was used instead of the support 3 and RLC (2) was used instead of DLC (4) in the production of the optically anisotropic layer B A circularly polarizing plate (P-4) was produced.
The relationship between the angle between the absorption axis of the polarizing film in the patterned circularly polarizing plate (P-4) and the in-plane slow axes of the optically anisotropic layer A and the optically anisotropic layer B is as follows. It was the same as the plate (P-1).

<Example 5>
In the formation of the optically anisotropic layer A, the rubbing direction with respect to the longitudinal direction of the film was changed from 0 ° to −105.1 °, the support 6 was used instead of the support 4, and the optically anisotropic layer A Example 1 except that DLC (3) was used instead of DLC (1) during the production, and DLC (2) was used instead of DLC (4) during the production of the optically anisotropic layer B. (Alkali saponification treatment), (formation of alignment film), (formation of optically anisotropic layer A), and (formation of optically anisotropic layer B) were carried out to produce a retardation plate.
Next, on the exposed surface of the optically anisotropic layer B of the obtained retardation plate, the above polarizing film and the above polarizing film protective film are continuously bonded using a polyvinyl alcohol-based adhesive. A patterned circularly polarizing plate (P-5) was produced. That is, the patterned circularly polarizing plate (P-5) includes a polarizing film protective film, a polarizing film, an optically anisotropic layer B (corresponding to the second patterned optically anisotropic layer), and an optically anisotropic layer A (the above-described first film). This corresponds to one pattern optically anisotropic layer), and has a transparent support in this order. The order of the polarizing film, the optically anisotropic layer B, the optically anisotropic layer A, and the transparent support is shown in FIG. It corresponds to an aspect.
Note that the absorption axis of the polarizing film coincides with the longitudinal direction of the patterned circularly polarizing plate, and the first retardation region and the second retardation region of the optically anisotropic layer B are based on the absorption axis of the polarizing film. In-plane slow axes are located at −26.5 ° and −116.5 °, respectively, and what is the optically anisotropic layer B in the first retardation region and the second retardation region of the optically anisotropic layer A? The in-plane slow axes of the opposite surface are located at -105.1 ° and -195.1 °, respectively.
The rotation angle of the in-plane slow axis is expressed as a positive angle in the counterclockwise direction and a negative angle value in the clockwise direction with reference to the absorption axis of the polarizing film by observing the retardation film from the polarizing film side. It is.

<Example 6>
According to the same procedure as in Example 5, except that the support 5 was used instead of the support 6 and RLC (1) was used instead of DLC (2) in the production of the optically anisotropic layer B A circularly polarizing plate (P-6) was produced.
The relationship between the angle between the absorption axis of the polarizing film in the patterned circularly polarizing plate (P-6) and the in-plane slow axes of the optically anisotropic layer A and the optically anisotropic layer B is as follows. It was the same as the plate (P-5).

<Example 7>
When forming the optically anisotropic layer A, the polarizing transmission axis direction of the polarizing plate of the first mask with respect to the longitudinal direction of the film is changed from 0 ° to −105.1 °, and the second mask with respect to the longitudinal direction of the film The polarizing transmission axis direction of the polarizing plate was changed from 90 ° to -195.1 °, and RLC (2) was used instead of RLC (1) in the production of the optically anisotropic layer A. A retardation plate was produced according to the same procedure as in Example 2 except that DLC (2) was used instead of DLC (4) in the production of the conductive layer B.
Next, on the exposed surface of the optically anisotropic layer B of the obtained retardation plate, the above-mentioned polarizing film and the above-mentioned polarizing film protective film are continuously bonded using a polyvinyl alcohol-based adhesive. A patterned circularly polarizing plate (P-7) was produced. That is, the patterned circularly polarizing plate (P-7) includes the polarizing film protective film, the polarizing film, the optically anisotropic layer B (corresponding to the second patterned optically anisotropic layer), and the optically anisotropic layer A (the first film). This corresponds to one pattern optically anisotropic layer), and has a transparent support in this order. The order of the polarizing film, the optically anisotropic layer B, the optically anisotropic layer A, and the transparent support is shown in FIG. It corresponds to an aspect.
The relationship between the angle between the absorption axis of the polarizing film in the patterned circularly polarizing plate (P-7) and the in-plane slow axes of the optically anisotropic layer A and the optically anisotropic layer B is as follows. Same as plate (P-5).

<Example 8>
A patterned circularly polarizing plate (P-8) was produced according to the same procedure as in Example 7, except that RLC (1) was used instead of DLC (2) in the production of the optically anisotropic layer B.
The relationship between the angle between the absorption axis of the polarizing film in the patterned circularly polarizing plate (P-8) and the in-plane slow axes of the optically anisotropic layer A and the optically anisotropic layer B is as follows. It was the same as the plate (P-5).

<Example 9>
The support 6 is used in place of the support 4, the DLC (5) is used in place of the DLC (1) in the production of the optically anisotropic layer A, and the optically anisotropic layer B is produced in the production. DLC (6) is used instead of DLC (4), and the alignment film 1 forming step is provided between (formation of optically anisotropic layer A) and (formation of optically anisotropic layer B), The formed alignment film is exposed to UV light so that the alignment film region irradiated with the mask exposure of the alignment film 1 before the optical anisotropic layer A is formed and the mask opening coincide with each other, and the film longitudinal direction is set. A patterned circularly polarizing plate (P-9) was produced in the same manner as in Example 1 except that rubbing was performed in the 149.7 ° direction as a reference and the optically anisotropic layer B was formed on the alignment film. That is, the patterned circularly polarizing plate (P-9) includes a polarizing film protective film, a polarizing film, a transparent support, an optically anisotropic layer A (corresponding to the first patterned optically anisotropic layer), an optically anisotropic layer. B (corresponding to the second pattern optically anisotropic layer) in this order, and the order of the polarizing film, the transparent support, the optically anisotropic layer A, and the optically anisotropic layer B is as shown in FIG. It corresponds to an aspect.
The absorption axis of the polarizing film coincides with the longitudinal direction of the patterned circularly polarizing plate, and the first retardation region and the second retardation region of the optical anisotropic layer A are based on the absorption axis of the polarizing film. The in-plane slow axis of the surface on the optically anisotropic layer B side is located at −59.7 ° and −149.7 °, respectively, and the first retardation region and the second retardation of the optically anisotropic layer B The in-plane slow axis of the surface on the optically anisotropic layer A side in the region is located at −149.7 ° and −239.7 °, respectively, and the first retardation region and the second position of the optically anisotropic layer B In-plane slow axes of the surface opposite to the optically anisotropic layer A side in the phase difference region are located at −277.3 ° and −367.3 °, respectively.
The rotation angle of the in-plane slow axis is expressed as a positive angle in the counterclockwise direction and a negative angle value in the clockwise direction with reference to the absorption axis of the polarizing film by observing the retardation film from the polarizing film side. It is.

<Example 10>
RLC (3) is used instead of RLC (1) when manufacturing optically anisotropic layer A, and DLC (6) is used instead of DLC (4) when manufacturing optically anisotropic layer B The alignment film 1 forming step is provided between (formation of the optically anisotropic layer A) and (formation of the optically anisotropic layer B). UV exposure is performed so that the alignment film region irradiated with the exposure region of the first mask of the alignment film 2 before the formation of A and the mask opening coincide with each other, and the direction of 149.7 ° with respect to the longitudinal direction of the film. A patterned circularly polarizing plate (P-10) was produced according to the same procedure as in Example 2 except that the optically anisotropic layer B was formed on the alignment film.
The relationship between the angle between the absorption axis of the polarizing film in the patterned circularly polarizing plate (P-10) and the in-plane slow axes of the optically anisotropic layer A and the optically anisotropic layer B is as follows. It was the same as the plate (P-9).

<Example 11>
RLC (4) is used instead of DLC (6) in the production of optically anisotropic layer B, and between (formation of optically anisotropic layer A) and (formation of optically anisotropic layer B) The alignment film 2 forming step is provided so that the polarization transmission axis direction of the polarizing plate of the first mask with respect to the longitudinal direction of the film is 149.7 °, and the polarized light transmission of the polarizing plate of the second mask with respect to the longitudinal direction of the film is performed. A patterned circularly polarizing plate (P-11) was produced according to the same procedure as in Example 9 except that the axial direction was 239.7 °.
The relationship between the angle between the absorption axis of the polarizing film in the patterned circularly polarizing plate (P-11) and the in-plane slow axes of the optically anisotropic layer A and the optically anisotropic layer B is as follows. It was the same as the plate (P-9).

<Example 12>
RLC (4) is used instead of DLC (6) in the production of optically anisotropic layer B, and between (formation of optically anisotropic layer A) and (formation of optically anisotropic layer B) The alignment film 2 forming step is provided so that the polarization transmission axis direction of the polarizing plate of the first mask with respect to the longitudinal direction of the film is 149.7 °, and the polarized light transmission of the polarizing plate of the second mask with respect to the longitudinal direction of the film is performed. A patterned circularly polarizing plate (P-12) was produced according to the same procedure as in Example 10 except that the axial direction was 239.7 °.
The angle relationship between the absorption axis of the polarizing film in the patterned circularly polarizing plate (P-12) and the in-plane slow axes of the optically anisotropic layer A and the optically anisotropic layer B is as follows. It was the same as the plate (P-9).

<Example 13>
The rubbing direction with respect to the longitudinal direction of the film during (formation of optically anisotropic layer A) was changed from −105.1 ° to −277.3 °, and DLC (3) DLC (6) is used instead of DLC, DLC (5) is used instead of DLC (2) in the production of the optically anisotropic layer B, (formation of optically anisotropic layer A) and (optical The alignment film 1 formation step is provided between the formation of the anisotropic layer B and the formed alignment film is irradiated by mask exposure of the alignment film 1 before the optical anisotropic layer A is formed. Except that the alignment film region and the mask opening were exposed to UV light so that the mask opening was aligned, rubbed in the direction of −59.7 ° with respect to the film longitudinal direction, and the optically anisotropic layer B was formed on the alignment film. Example 5 (alkali saponification treatment), (formation of alignment film), (formation of optically anisotropic layer A), and Conduct formation of the optically anisotropic layer B), it was produced a retardation plate.
Next, on the exposed surface of the optically anisotropic layer B of the obtained retardation plate, the above-mentioned polarizing film and the above-mentioned polarizing film protective film are continuously bonded using a polyvinyl alcohol-based adhesive. Shaped circularly polarizing plate (P-13) was produced. That is, the patterned circularly polarizing plate (P-13) includes a polarizing film protective film, a polarizing film, an optically anisotropic layer B (corresponding to the first patterned optically anisotropic layer), and an optically anisotropic layer A (the first film Corresponding to a two-pattern optically anisotropic layer), having a transparent support in this order, and the order of the polarizing film, the optically anisotropic layer B, the optically anisotropic layer A, and the transparent support is the above-mentioned FIG. It corresponds to an aspect.
Note that the absorption axis of the polarizing film coincides with the longitudinal direction of the patterned circularly polarizing plate, and the first retardation region and the second retardation region of the optically anisotropic layer B are based on the absorption axis of the polarizing film. In-plane slow axes of the surface on the optically anisotropic layer A side are located at −59.7 ° and −149.7 °, respectively, and the first retardation region and the second retardation of the optically anisotropic layer A In-plane slow axes of the surface on the optically anisotropic layer B side in the region are located at −149.7 ° and −239.7 °, respectively, and the first retardation region and the second position of the optically anisotropic layer A In-plane slow axes of the surface opposite to the optically anisotropic layer B side in the phase difference region are located at −277.3 ° and −367.3 °, respectively.
The rotation angle of the in-plane slow axis is expressed as a positive angle in the counterclockwise direction and a negative angle value in the clockwise direction with reference to the absorption axis of the polarizing film by observing the retardation film from the polarizing film side. It is.

<Example 14>
Using the support 7 instead of the support 6 and using RLC (3) instead of DLC (5) in the production of the optically anisotropic layer B (formation of the optically anisotropic layer A) and (The formation of the optically anisotropic layer B) is provided with the alignment film 2 forming step so that the polarization transmission axis direction of the polarizing plate of the first mask with respect to the film longitudinal direction is -59.7 °. A patterned circularly polarizing plate (P-14) was produced according to the same procedure as in Example 13 except that the polarization transmission axis direction of the polarizing plate of the second mask with respect to the longitudinal direction was set to -149.7 °.
The angle relationship between the absorption axis of the polarizing film in the patterned circularly polarizing plate (P-14) and the in-plane slow axes of the optically anisotropic layer A and the optically anisotropic layer B is as follows. Same as plate (P-13).

<Example 15>
When the support 1 is used instead of the support 3, RLC (4) is used instead of RLC (3) when the optically anisotropic layer A is manufactured, and when the optically anisotropic layer B is manufactured Using DLC (5) instead of DLC (6), the polarizing transmission axis direction of the polarizing plate of the first mask with respect to the film longitudinal direction during (formation of optically anisotropic layer A) is from 0 °- The polarization transmission axis direction of the polarizing plate of the second mask with respect to the film longitudinal direction was changed from 90 ° to −367.3 °° (formation of optically anisotropic layer A) The first alignment film 2 before the optical anisotropic layer A is formed with respect to the formed alignment film by providing the above-mentioned alignment film 1 formation step between (the formation of the optical anisotropic layer B) The mask is exposed to ultraviolet rays so that the alignment film area irradiated by the mask exposure area and the mask opening coincide with each other, and the film longitudinal direction Rubbed -59.7 ° direction with reference, except that the formation of the optically anisotropic layer B on the alignment film, to produce a pattern circularly polarizing plate (P-15) according to the procedure as in Example 10.
The relationship between the angle between the absorption axis of the polarizing film in the patterned circularly polarizing plate (P-15) and the in-plane slow axes of the optically anisotropic layer A and the optically anisotropic layer B is as follows. Same as plate (P-13).

<Example 16>
Using support 2 instead of support 1, using RLC (3) instead of DLC (5) in the production of optically anisotropic layer B, (formation of optically anisotropic layer A) and (The formation of the optically anisotropic layer B) is provided with the alignment film 2 forming step so that the polarization transmission axis direction of the polarizing plate of the first mask with respect to the film longitudinal direction is -59.7 °. A patterned circularly polarizing plate (P-16) was produced in the same manner as in Example 15 except that the polarization transmission axis direction of the polarizing plate of the second mask with respect to the longitudinal direction was set to -149.7 °.
The relationship between the angle between the absorption axis of the polarizing film in the patterned circularly polarizing plate (P-16) and the in-plane slow axes of the optically anisotropic layer A and the optically anisotropic layer B is as follows. It was the same as the plate (P-13).

Table 2 below shows the compositions of DLC (1) to (6) and RLC (1) to (4) used in Examples 1 to 16 above.
When producing an optically anisotropic layer using any of DLC (1) to (6) or RLC (1) to (4), various conditions such as the alignment temperature, the alignment time, and the polymerization temperature are as follows: The conditions in Table 2 were followed.
The relationship between the absorption axis of the polarizing film and the in-plane slow axes of the first pattern optical anisotropic layer and the second pattern optical anisotropic layer in Examples 1 to 8 described above is shown in FIG. It corresponds to the aspect of.
The relationship between the absorption axis of the polarizing film and the in-plane slow axes of the first pattern optical anisotropic layer and the second pattern optical anisotropic layer in Examples 9 to 16 described above is shown in FIG. It corresponds to the aspect of.

Moreover, the result of the said Example is collectively shown below.
Note that Δnd of the optically anisotropic layer A and optically anisotropic layer B in Examples 1 to 16 and the angle with the absorption axis of the polarizing film were measured using Axoscan manufactured by Axometrics.
Further, the rubbing directions in Tables 3 to 6 are observed in the support from the surface side on which the optically anisotropic layer is laminated, the longitudinal direction of the support is 0 ° as a reference, and the counterclockwise direction is positive. It is represented with a negative angle value in the clockwise direction.
On the other hand, the rotation angle of the in-plane slow axis of the optically anisotropic layer A and the optically anisotropic layer B with respect to the absorption axis of the polarizing film is counterclockwise by observing the retardation plate from the polarizing film side. It is represented with positive and clockwise negative angle values.

<Comparative Example 1>
An alignment underlayer and an alignment film 2 were formed in the same manner as in Example 2 using a commercially available cellulose acylate film “TD80UL” (manufactured by FUJIFILM Corporation) as a support.
In the first mask, the polarizing transmission axis direction of the polarizing plate with respect to the longitudinal direction of the film is 45 °, and in the second mask, the polarizing transmission axis direction of the polarizing plate with respect to the longitudinal direction of the film is −45 °. (RLC (1)) was coated with a # 2.5 wire bar, and a patterned retardation layer was formed in the same manner as in Example 2 except that UV irradiation was performed at 95 ° C. In each exposed portion, the rod-like liquid crystal compound was horizontally aligned with the slow axis direction parallel to the polarized light irradiation direction, and each phase difference was 137 nm.
On the pattern λ / 4 plate retardation plate produced above, the above-mentioned polarizing film and the above-mentioned polarizing film protective film are crossed at an angle of 45 degrees between the in-plane slow axis of the retardation film and the absorption axis of the polarizing film. In this way, a patterned circularly polarizing plate (P-17) (Comparative Example 1) was prepared by using a polyvinyl alcohol-based adhesive.
That is, the patterned circularly polarizing plate has a polarizing film protective film, a polarizing film, and a pattern λ / 4 plate in this order.

<Evaluation of 3D device mounting and display performance>
(Mounting on display devices)
Remove the pattern retardation plate and front polarizing plate used in the 3D monitor W220S (made by Hyundai) of the pattern retarder method, and paste each of the pattern circular polarizing plates (P-1) to (P-17). A 3D display device was produced. Each circularly polarizing plate was bonded with the linearly polarizing film on the liquid crystal cell side and the surface layer on the outside on the viewing side.
(Production of glasses)
A circularly polarizing plate (G-1) was produced according to the same procedure as in Example 3 except that the alignment film 1 was not exposed to ultraviolet light. Further, a circularly polarizing plate (G-2) was produced according to the same procedure except that the rubbing direction was changed from 0 ° to 90 °. These circularly polarizing plates were mounted on the left and right sides of the spectacle frame so that the polarizing layer side was on the eyeball side to produce 3D spectacles.

Subsequently, each manufactured 3D display device is set to 3D display, with one eye displayed in white and the other eye displayed in black, and a measuring instrument (manufactured by BM-5A Topcon) is placed through the white display side glasses. The whiteness of the glasses during rotation was measured. When the patterning period of the patterning retardation film is in the vertical direction, the crosstalk performance in 3D display in the vertical direction is deteriorated in principle, so it is important to improve the viewing angle performance in the horizontal direction. Therefore, based on the difference between the minimum value and the maximum value of the color v ′ in the white display at the azimuth angle of 0 degrees and the polar angle of 45 degrees, the evaluation was made according to the following criteria.
A: v ′ change of white display is less than 0.015 (acceptable to such an extent that a very slight tint is visually recognized)
B: v ′ change of white display is 0.015 or more and less than 0.025 (color tinting is visually recognized).
C: v ′ change of white display is 0.025 or more (a color tint is intense and unacceptable)

As an evaluation result, the pattern circularly polarizing plates (P-1) to (P-16) were all A, but the pattern circularly polarizing plate (P-17) of the comparative example was C.

10a, 10b Retardation plate 12

Transparent support

14a, 14b Pattern optical

anisotropic layer

16a, 16b First pattern optical

anisotropic layer

18a, 18b Second pattern optical

anisotropic layer

20a, 20b First phase difference region 22a 22b

Second retardation region

24a, 24b, 26a, 26b, 28a, 28b, 30a, 30b Region 32

Polarizing film

100a, 100b, 100c, 100d Circularly polarizing plate

Claims

Pattern optics that includes a first phase difference region and a second phase difference region whose in-plane slow axis directions are different from each other, and in which the first phase difference region and the second phase difference region are alternately arranged in the plane A retardation plate having at least an anisotropic layer,
The patterned optical anisotropic layer is a layer in which a first patterned optical anisotropic layer and a second patterned optical anisotropic layer are laminated,
An in-plane slow axis on the surface opposite to the second pattern optical anisotropic layer side in the first retardation region of the first pattern optical anisotropic layer, and the first pattern optical anisotropy An in-plane slow axis on the surface opposite to the second pattern optically anisotropic layer side in the second retardation region of the layer,
The first pattern optical anisotropic layer and the second pattern optical anisotropic layer include a twist-aligned liquid crystal compound having a thickness direction as a helical axis,
The twist direction of the liquid crystal compound in the first retardation region and the second retardation region in the first pattern optical anisotropic layer, and the first retardation region in the second pattern optical anisotropic layer And the twist direction of the liquid crystal compound in the second retardation region is the same direction,
The twist angle of the liquid crystal compound in the first pattern optically anisotropic layer is 26.5 ± 10.0 °;
The twist angle of the liquid crystal compound in the second patterned optically anisotropic layer is 78.6 ± 10.0 °;
In the first retardation region and the second retardation region, an in-plane slow axis on the surface of the first pattern optical anisotropic layer on the second pattern optical anisotropic layer side, and the second pattern An in-plane slow axis on the surface of the optically anisotropic layer on the first pattern optically anisotropic layer side is parallel to the surface,
The product Δn1 · d1 of the refractive index anisotropy Δn1 of the first pattern optical anisotropic layer measured at a wavelength of 550 nm and the thickness d1 of the first pattern optical anisotropic layer, and the value measured at a wavelength of 550 nm The values of the products Δn2 · d2 of the refractive index anisotropy Δn2 of the second patterned optically anisotropic layer and the thickness d2 of the second patterned optically anisotropic layer are the following formulas (1) and (2), respectively. Satisfying the retardation plate.
Formula (1) 252 nm ≦ Δn1 · d1 ≦ 312 nm
Formula (2) 110 nm ≦ Δn 2 · d 2 ≦ 170 nm
The phase difference plate according to claim 1, wherein the liquid crystal compound is a discotic liquid crystal compound or a rod-like liquid crystal compound.
The phase difference plate according to claim 1 or 2, wherein the first phase difference regions and the second phase difference regions are alternately arranged in a stripe shape.
4. The retardation plate according to claim 1, wherein there is substantially no alignment film between the first pattern optical anisotropic layer and the second pattern optical anisotropic layer.
A circularly polarizing plate comprising at least a polarizing film and the retardation plate according to any one of claims 1 to 4,
The polarizing film, the first pattern optical anisotropic layer, and the second pattern optical anisotropic layer in this order,
In-plane at the surface on the polarizing film side in one of the first retardation region and the second retardation region of the first patterned optically anisotropic layer and the absorption axis of the polarizing film A circularly polarizing plate whose slow axis is parallel or perpendicular.
A pattern optical pattern including a first phase difference region and a second phase difference region having mutually different in-plane slow axis directions, and wherein the first phase difference region and the second phase difference region are alternately arranged in the plane. A retardation plate having at least an isotropic layer,
The patterned optical anisotropic layer is a layer in which a first patterned optical anisotropic layer and a second patterned optical anisotropic layer are laminated,
An in-plane slow axis on the surface opposite to the second pattern optical anisotropic layer side in the first retardation region of the first pattern optical anisotropic layer, and the first pattern optical anisotropy An in-plane slow axis on the surface opposite to the second pattern optically anisotropic layer side in the second retardation region of the layer,
The first pattern optical anisotropic layer and the second pattern optical anisotropic layer include a twist-aligned liquid crystal compound having a thickness direction as a helical axis,
The twist direction of the liquid crystal compound in the first retardation region and the second retardation region in the first pattern optical anisotropic layer, and the first retardation region in the second pattern optical anisotropic layer And the twist direction of the liquid crystal compound in the second retardation region is the same,
The twist angle of the liquid crystal compound in the first pattern optically anisotropic layer is 59.7 ± 10.0 °;
The twist angle of the liquid crystal compound in the second patterned optically anisotropic layer is 127.6 ± 10.0 °;
In the first retardation region and the second retardation region, an in-plane slow axis on the surface of the first pattern optical anisotropic layer on the second pattern optical anisotropic layer side, and the second pattern An in-plane slow axis on the surface of the optically anisotropic layer on the first pattern optically anisotropic layer side is orthogonal,
The value of the product Δn1 · d1 of the refractive index anisotropy Δn1 of the first patterned optically anisotropic layer measured at a wavelength of 550 nm and the thickness d1 of the first patterned optically anisotropic layer, and the measured at a wavelength of 550 nm The values of the products Δn2 · d2 of the refractive index anisotropy Δn2 of the second pattern optically anisotropic layer and the thickness d2 of the second pattern optically anisotropic layer are the following formulas (3) and (4), respectively. Satisfying the retardation plate.
Formula (3) 111 nm ≦ Δn1 · d1 ≦ 171 nm
Formula (4) 252 nm ≦ Δn 2 · d 2 ≦ 312 nm
The retardation plate according to claim 6, wherein the liquid crystal compound is a discotic liquid crystal compound or a rod-like liquid crystal compound.
The phase difference plate according to claim 6 or 7, wherein the first phase difference regions and the second phase difference regions are alternately arranged in a stripe shape.
9. The retardation plate according to claim 6, wherein there is substantially no alignment film between the first pattern optical anisotropic layer and the second pattern optical anisotropic layer.
A circularly polarizing plate comprising at least a polarizing film and the retardation plate according to any one of claims 6 to 9,
The polarizing film, the first pattern optical anisotropic layer, and the second pattern optical anisotropic layer in this order,
In-plane at the surface on the polarizing film side in one of the first retardation region and the second retardation region of the first patterned optically anisotropic layer and the absorption axis of the polarizing film A circularly polarizing plate whose slow axis is parallel or perpendicular.
A display panel driven based on an image signal;
The phase difference plate according to any one of claims 1 to 4 and 6 to 9, or the circularly polarized light according to any one of claims 5 and 10, which is disposed on the viewing side of the display panel. A 3D image display device having at least a plate.