TW201508353A - Optical film, circularly polarizing film, 3D image display device - Google Patents

Abstract

The invention provides an optical film, and a circularly polarizing film having the optical film, and a 3D image display device, wherein the optical film, when applied to a high definition display panel, is able to suppress a crosstalk at observing a 3D image. The optical film is an optical film having a patterned optically anisotropic layer which has first retardation regions and second retardation regions, wherein the first retardation regions and the second retardation regions are different in at least one of an in-plane slow axis direction and in-plane retardation. The first retardation regions and the second retardation regions are alternately arranged in a stripe shape in the same plane. A width of the first retardation regions and a width of the second retardation regions are 50 to 250[mu]m. Widths of boundary lines positioned on boundaries of the first retardation regions and the second retardation regions and including non-alignment regions are 0.1 to 10[mu]m.

Description

Optical film, circular polarizing film, 3D image display device

The invention relates to an optical film, a circular polarizing film and a three-dimensional (3D) image display device.

For a 3D video display device that displays 3D (stereo) images, an optical member for making a right-eye image and a left-eye image into, for example, a circularly polarized image in opposite directions to each other is required. For such an optical member, for example, a pattern optical anisotropic element is used, and the pattern optical anisotropic element is regularly arranged in a plane with a region different from each other such as a slow axis or a retardation (Patent Document 1) ).

Prior art literature

Patent literature

Patent Document 1: Japanese Patent No. 3360787

On the other hand, a flat panel display such as a liquid crystal display device (hereinafter also referred to as an LCD (Liquid Crystal Display)) is used as a power consumption. The use of small and space-saving image display devices has been expanding year by year.

In the flat panel display market in recent years, as one of the performance improvement of LCDs, development is progressing to further improve high definition, especially in a tablet type personal computer (PC) or a smart phone (smartphone). In other small size devices, further high definition is required. Moreover, in large-scale equipment, the current TV (TV) specifications (Full High Definition (FHD), National Television System Committee (NTSC) ratio is 72% ≒ European Broadcasting Union (European Broadcasting Union, EBU) The development of the next generation of high vision (4K2K, EBU ratio of 100% or more). Therefore, there is an increasing demand for high definition of liquid crystal display devices. The same is true for the 3D image display device.

The inventors of the present invention have found that a conventionally known optical film having a patterned optical anisotropic layer is applied to a high-definition display panel having a small image pitch, and crosstalk is deteriorated when the 3D image is observed. Will become significant.

An object of the present invention is to provide an optical film which can suppress crosstalk when viewing a 3D image when applied to a high-definition display panel in view of the above circumstances.

Further, it is an object of the invention to provide a circularly polarizing film and a 3D image display device having the optical film.

The inventors of the present invention conducted intensive studies on the problems of the prior art and found that the width of the first phase difference region in the pattern optical anisotropic layer and the second The width of the phase difference region and the width of the boundary line between the two are adjusted to solve the problem.

That is, the inventors of the present invention have found that the object can be attained by the following configuration.

(1) A 3D image display device comprising: at least a display panel; and an optical film disposed on a visible side of the display panel and having a patterned optical anisotropic layer, the patterned optical anisotropic layer having an in-plane slow axis direction and a surface The first phase difference region and the second phase difference region in which at least one of the internal delays is different from each other, and the first phase difference region and the second phase difference region are alternately arranged in a stripe shape in the same plane, and The width of the 1 phase difference region and the width of the second phase difference region are 50 μm to 250 μm. The width of the boundary line including the unaligned region at the boundary between the first phase difference region and the second phase difference region is (corresponding to) 0.1μm~10μm.

(2) The 3D video display device according to (1), wherein the in-plane slow axis direction of the first phase difference region and the in-plane slow axis direction of the second phase difference region are orthogonal to each other.

(3) The 3D video display device according to (1) or (2), wherein the in-plane retardation Re (550) of the first phase difference region and the second phase difference region at a wavelength of 550 nm is 110 nm to 160 nm.

The 3D video display device according to any one of the aspects of the present invention, wherein the width of the first phase difference region and the width of the second phase difference region are 50 μm to 80 μm.

The 3D image display device according to any one of (1) to (4) wherein the pattern optical anisotropic layer is disposed on the transparent support.

The 3D video display device according to any one of (1) to (5) wherein the display panel has a pixel pitch of 10 μm to 250 μm.

(7) An optical film having a patterned optical anisotropic layer, wherein the patterned optically anisotropic layer has a first phase difference region and a second phase in which at least one of an in-plane slow axis direction and an in-plane retardation are different from each other In the phase difference region, the first phase difference region and the second phase difference region are alternately arranged in stripes in the same plane, and the width of the first phase difference region and the width of the second phase difference region are 50 μm to 250 μm (corresponding to The width of the boundary line including the non-alignment region at the boundary between the first phase difference region and the second phase difference region is 0.1 μm to 10 μm.

(8) The optical film according to the above aspect, wherein the in-plane slow axis direction of the first phase difference region and the in-plane slow axis direction of the second phase difference region are orthogonal to each other.

(9) The optical film according to the above aspect, wherein the first retardation region and the second retardation region have an in-plane retardation Re (550) at a wavelength of 550 nm of 110 nm to 160 nm.

The optical film according to any one of the aspects of the present invention, wherein the width of the first phase difference region and the width of the second phase difference region are 50 μm to 80 μm.

The optical film according to any one of (7) to (10) wherein the pattern optical anisotropic layer is disposed on the transparent support.

(12) A circularly polarizing film comprising the optical film according to any one of (7) to (10), and a polarizing film, One of the in-plane slow axis of the first phase difference region and the in-plane slow axis of the second phase difference region is at an angle of +45° with respect to the transmission axis of the polarizing film, and the in-plane slow axis of the first phase difference region The other of the in-plane slow axes of the second phase difference region is at an angle of -45 with respect to the transmission axis of the polarizing film.

According to the present invention, it is possible to provide an optical film which can suppress crosstalk when viewing a 3D image when applied to a high-definition display panel.

Further, according to the present invention, a circularly polarizing film having the optical film and a 3D image display device can be provided.

10a, 10b, 10c, 10d‧‧3D image display device

12‧‧‧ display panel

14‧‧‧ glass substrate

16, 140‧‧‧ polarizing film

18‧‧‧Striped pattern optical anisotropic layer

20‧‧‧Black matrix

22, 130‧‧‧ boundary line

100‧‧‧pattern optical anisotropic layer

110‧‧‧1st phase difference zone

120‧‧‧2nd phase difference zone

A, B‧‧ arrows

L‧‧‧ Left-eye image pixel/left-eye image phase difference area

R‧‧‧Phase difference area for right eye image/right eye image

T1‧‧‧ thickness of glass substrate

Thickness of T2‧‧‧ polarizing film

W1‧‧‧Width of the first phase difference zone

W2‧‧‧ width of the second phase difference zone

W3‧‧‧ boundary line width

W4‧‧‧ pixel spacing

The width of the W5‧‧‧ black matrix

FIG. 1 is a schematic diagram in which the left and right eye image pixels of the display panel are arranged in correspondence with the phase difference regions of the left and right eye images of the conventional stripe pattern optical anisotropic layer.

FIG. 2 is a schematic diagram in which the left and right eye image pixels of the conventional black matrix are arranged in accordance with the phase difference regions of the left and right eye images of the conventional stripe pattern optical anisotropic layer.

3 is a view in which the thickness of the glass between the left and right eye image pixels of the conventional display panel and the phase difference region between the left and right eye images of the conventional stripe pattern optical anisotropic layer is reduced. schematic diagram.

4 is a plan view showing an example of a pattern optical anisotropic layer.

Figure 5 is a view showing the in-plane slow axis of the pattern optical anisotropic layer and the transmission axis of the polarizing film A schematic diagram of an example of the relationship.

Fig. 6 is a schematic cross-sectional view of the 3D image display device 1 produced in the first embodiment.

7(a) and 7(b) are schematic views showing the arrangement of a wire grid polarizing element in Comparative Example 1.

Fig. 8 is a schematic view showing a method of measuring the width of a boundary line.

Hereinafter, the present invention will be described in detail. In addition, the numerical range represented by the "~" in this specification is a range which contains the numerical value of the before and the "~" as a lower-limit and upper-limit.

Further, in the present specification, the angle (for example, an angle such as "90°") and the relationship thereof (for example, "orthogonal", "parallel", and "intersected at 45", etc.) are included in the technical field to which the present invention pertains. The allowable error range is, for example, a range of less than a strict angle of ±10°, and the error with a strict angle is preferably 5 or less, more preferably 3 or less.

Re(λ) and Rth(λ) respectively indicate the in-plane retardation at the wavelength λ and the retardation in the thickness direction. Re (λ) is measured by causing light of a wavelength λ nm to enter the film normal direction in KOBRA 21ADH or WR (manufactured by Oji Scientific Instruments Co., Ltd.). When the measurement wavelength λ nm is selected, the wavelength selection filter can be manually replaced, or the measurement value can be replaced by a program or the like to perform measurement. A detailed measurement method of Re(λ) and Rth(λ) is described in paragraphs 0010 to 0012 of Japanese Patent Laid-Open Publication No. 2013-041213, the contents of which are hereby incorporated by reference. Furthermore, in this specification, there is no special attachment to the measurement wavelength. In the case of the injection, the measurement wavelength was 550 nm.

Hereinafter, preferred embodiments of the optical film of the present invention will be described in detail.

First, the problems of the prior art and the features of the present invention will be described in detail.

In a 3D image display device using an optical film having a patterned optical anisotropic layer, it is usually necessary to use a pixel for left and right eye images existing on a display panel portion such as a liquid crystal panel, and left and right eyes of the pattern optical anisotropic layer. The phase difference regions (the first phase difference region and the second phase difference region) for video are layered correspondingly. More specifically, when an optical film having an optically anisotropic layer (hereinafter also referred to as a striped pattern optical anisotropic layer) is bonded to a display panel, the periodic direction of the pattern is generally made (striped The direction in which the same phase difference regions are alternately changed is the same as the vertical direction (up-and-down direction) of the display surface, and the optically anisotropic layer has a phase difference region for left and right eye images arranged in a stripe shape. FIG. 1 is a partially enlarged cross-sectional view showing the left and right eye image pixels of the display panel unit and the phase difference regions for the left and right eye images of the conventional stripe pattern optical anisotropic layer. Further, the left and right eye image phase difference regions of the stripe pattern optical anisotropic layer correspond to the first phase difference region and the second phase difference region, which will be described later.

The conventional 3D video display device 10a shown in FIG. 1 sequentially includes a display panel 12, a glass substrate 14, a polarizing film 16, and a stripe-shaped pattern optical anisotropic layer 18. In the display panel 12, the left-eye image pixel (L) and the right-eye image pixel (R) are alternately arranged, and the left-eye image pixel (L) and the right-eye image pixel (R) are arranged alternately. A black matrix 20 is usually arranged. Further, the phase difference region (L) for the left-eye image and the phase difference for the right-eye image are alternately arranged on the stripe-shaped pattern optical anisotropic layer 18. The regions (R) are disposed at positions facing the left-eye image pixels (L) and the right-eye image pixels (R) in the display panel 12, respectively. Further, in the stripe pattern optical anisotropic layer 18, there is a boundary line 22 which is an unaligned region between the left-eye image phase difference region (L) and the right-eye image phase difference region (R).

The light indicated by the arrow A in FIG. 1 is emitted from the right-eye image pixel (R) inside the display panel 12, and passes through the phase difference region (R) of the right-eye image of the optically anisotropic layer 18 in the stripe pattern. Therefore, a normal right eye image is formed. On the other hand, the light indicated by the arrow B is emitted from the right-eye image pixel (R) inside the display panel and passes through the boundary line 22. The boundary line 22 is different from the phase difference area for the left and right eye images, and does not have the same optical anisotropy, so crosstalk of the passing light occurs. The phenomenon of the arrows A to B also occurs in the left-eye image pixel (L). In other words, the inventors of the present invention found that the crosstalk caused by the boundary line indicated by the arrow B is wider in the phase difference regions (L, R) of the left and right eye images as the width of the boundary line is wider.

In addition, in order to suppress the decrease in luminance due to recent high definition, the black matrix width of the color filter disposed in the liquid crystal cell is narrowed, and in this case, the stripe is formed. The deterioration of crosstalk due to the boundary line of the pattern optical anisotropic layer may become significant. In other words, in order to achieve high definition without reducing the luminance, it is necessary to improve crosstalk when the width of the black matrix is narrowed.

In the present invention, it is found that the widths of the first phase difference region and the second phase difference region corresponding to the phase difference regions of the left and right eye images in the stripe pattern optical anisotropic layer are adjusted to be defined. Value and make the width of the boundary line small It has been adjusted to a predetermined value in the past, whereby the crosstalk can be reduced.

In addition, in order to improve the crosstalk, for example, the following method is proposed (for example, Japanese Patent Laid-Open No. 2011-164563 and Japanese Patent Laid-Open No. 2011-34045), that is, as shown in the 3D image display device 10b of FIG. The width of the black matrix 20 of the color filter disposed in the display panel 12 is increased to block the component that causes crosstalk, but this causes a decrease in luminance, which is disadvantageous for high resolution.

Further, as another method, there is proposed a method of reducing the optical anisotropy of the display panel 12 and the stripe pattern as shown in the 3D image display device 10c of FIG. 3 (see, for example, Japanese Patent Laid-Open No. Hei 10-268233). The film thickness of the glass substrate 14 between the layers 18 narrows the gap between the display panel 12 and the stripe-shaped pattern optical anisotropic layer 18, thereby passing through the boundary line 22 of the stripe pattern optical anisotropic layer 18. Reduced ingredients. In this method, the brightness does not decrease. However, in order to improve the crosstalk, the thickness of the glass substrate 14 must be greatly reduced. As a result, the impact resistance of the 3D image display device 10c is lowered or the operability of the glass substrate 14 is lowered. The decline in yield, etc.

<Optical film (optical film for 3D image display device)>

Hereinafter, the optical film of the present invention will be described in detail.

4 is a plan view showing an example of a pattern optical anisotropic layer (hereinafter also referred to as a striped pattern optical anisotropic layer) 100 in the optical film of the present invention, wherein 110 represents a first phase difference region and 120 represents a second phase. The difference region 130 indicates a boundary line which is a boundary between the first phase difference region and the second phase difference region. The arrows in the first phase difference region 110 and the second phase difference region 120 indicate the directions of the respective in-plane slow axes. again Unless otherwise stated, the symbols in the drawings are also shared by the following drawings.

4 is a schematic view, and the relationship between the first phase difference region 110 and the second phase difference region 120 and the boundary line 130 will be described in a simple and easy-to-understand manner, and this is not the most suitable size ratio. The preferred range of these size ratios will be described later.

The first phase difference region and the second phase difference region are alternately arranged in a stripe shape in the same plane, and at least one of the in-plane slow axis direction and the in-plane retardation in the first phase difference region and the second phase difference region Different from each other. As described above, the optical film of the present invention is disposed on the outer side of the visible side of the display panel together with the polarizing film, and passes through the first phase difference region and the second phase difference region of the pattern optical anisotropic layer, respectively. Polarized glasses, etc., are recognized as images for the right eye or images for the left eye.

The first phase difference region and the second phase difference region are preferably equal in shape to each other. Moreover, the respective configurations are preferably equal. Further, the respective centers of the widths of the first phase difference region and the second phase difference region are preferably the same as the pitch width between the left-eye image pixel (L) and the right-eye image pixel (R) of the display panel. The center of the distribution is the distribution including the deviation, and the difference in the center position (the difference between the center of the phase difference region and the position of the center of the image-like pixel) is preferably 30 μm or less, and more preferably 15 μm or less. It is 5 μm or less. Further, in the present embodiment, the stripes may be formed along the longitudinal direction of the optical film or in a direction perpendicular to the longitudinal direction.

In FIG. 4, each of the first phase difference region 110 and the second phase difference region 120 has an in-plane slow axis that is orthogonal to each other. Further, in FIG. 4, the in-plane slow axis direction of the first phase difference region 110 and the in-plane slowness of the second phase difference region 120 are shown. Although the axial direction is orthogonal to each other, the angle between the in-plane slow axis of the first phase difference region 110 and the in-plane slow axis of the second phase difference region 120 is preferably 70 to 110, and more preferably 80. ~100°, preferably 90°.

The in-plane retardation Re (550) of the first retardation region 110 and the second retardation region 120 at a wavelength of 550 nm is not particularly limited, but is preferably 110 nm to 160 nm, more preferably 120 nm to 150 nm, and even more preferably It is 125 nm to 140 nm. Further, it is preferable that the range of the in-plane retardation is exhibited over the entire optical film even in the case where the optical film includes a layer other than the patterned optical anisotropic layer (for example, a transparent support).

Further, when the optical film includes a transparent support to be described later, the total value of Rth of the transparent support and the Rth of the pattern optical anisotropic layer preferably satisfies |Rth | ≦ 20 nm, and therefore, the transparent support is preferably Satisfy -150 nm ≦ Rth (630) ≦ 100 nm.

In FIG. 4, W1 is the width of the first phase difference region 110, W2 is the width of the second phase difference region 120, and W3 is located at (corresponding to) the first phase difference region and the second phase difference region. The width of the boundary line 130 at the boundary, that is, the distance between one end of the first phase difference region 110 and one end of the second phase difference region 120. The boundary line 130 has a narrow width, but is different from the first phase difference region 110 or the second phase difference region 120 in that the phase difference characteristic is collapsed. In other words, the boundary line 130 is different from the first phase difference region 110 and the second phase difference region 120, and is a non-alignment region (boundary region) in which the liquid crystal compound does not form the same alignment, and causes light leakage. In other words, the boundary line 130 is a liquid crystal compound aligned in any direction. The unaligned area does not include the aligned area (domain).

In the optical film 100, W1 and W2 are each 50 μm to 250 μm. Among them, from the viewpoint of further suppressing the occurrence of crosstalk, it is preferably 50 μm to 130 μm, and more preferably 50 μm to 80 μm. If W1 and W2 are outside the above range, the crosstalk cannot be suppressed when applied to a high-definition display panel. The difference between W1 and W2 is not particularly limited, but from the viewpoint of further suppressing the occurrence of crosstalk, it is preferably 0 μm to 5 μm, and more preferably 0 μm to 1 μm. Further, the width W3 of the boundary line is 0.1 μm to 10 μm, and from the viewpoint of further suppressing occurrence of crosstalk, it is preferably 0.1 μm to 8 μm, and more preferably 0.1 μm to 5 μm. When the width W3 of the boundary line exceeds 10 μm, the suppression of crosstalk is insufficient, and the image quality of the 3D image is poor.

In addition, the measuring method of W1, W2, and W3 is a method of measuring by the observation of a polarizing microscope. For example, the pattern optical anisotropic layer (the pattern optical anisotropic layer in which the in-plane slow axis of the first phase difference region is orthogonal to the in-plane slow axis of the second phase difference region) is the first phase difference region. Or the polarization axis of any one of the two polarizing plates in which the in-plane slow axis of any one of the second phase difference regions and the transmission axis are orthogonally arranged is parallel to each other, and is provided in a polarizing microscope (Nikon (NIKON) ) on the sample stage of the ECLIPE E600W POL). At this time, since the first phase difference region and the second phase difference region are displayed in black, and the boundary line is unaligned, the light is blocked and displayed in white. Therefore, each region can be specified. As a method of measuring the boundary line range, as described above, a polarizing microscope is used in such a manner that the transmission axes of any of the two polarizing plates combined in an orthogonal position are parallel, but as a general procedure, it is: Using a polarizing microscope, the transmission axis is combined in an orthogonal position. A pattern optical anisotropic layer is placed between the polarizers, and the pattern optical anisotropic layer is rotated in a plane perpendicular to the optical axis, and the first phase difference region is in a black display state. The phase difference region is compared with the observation chart in the black display state, and the region in which both of the two observation images are displayed in white corresponds to the boundary line which is the non-alignment region.

Next, the image observed by the polarizing microscope was introduced into a PC by a digital camera (NIKON DIGITAL CAMERA) DXM1200 mounted on a polarizing microscope, and the image analysis software WinROOF (Sangu Trading Co., Ltd.) was used. The width of the phase difference region, the second phase difference region, and the boundary line were measured. As a specific measurement method, for example, when measuring the width of the boundary line, first, as shown in FIG. 8, the boundary line 130 is used to observe the vicinity of the center by a polarizing microscope. At this time, as shown in FIG. 8, the direction in which the boundary line 130 extends is the vertical direction. Next, in the observation view, a straight line X connecting the apexes of the two convex portions that protrude to the leftmost side among the convex portions protruding toward the left side of the boundary line 130 is drawn. Next, starting from an arbitrary point Y on the straight line X, the length is calculated from the straight line X (arrow in the figure) to the right end of the boundary line 130 in the direction orthogonal to the straight line X. Further, the calculation of the length is performed at an interval of 50 μm (in the figure, D is 50 μm) at 10 points from an arbitrary point Y, and the lengths of the obtained 10 portions are arithmetically averaged to obtain a boundary line. The width A of 130. Further, the observation is performed at any three portions of the pattern optical anisotropic layer, and the width A of the boundary line 130 obtained in each observation view is further arithmetically averaged to obtain the width W3 of the boundary line.

Further, the operation of drawing the straight line X and the length measurement from the straight line X up to the right end portion of the boundary line 130 are performed using WinROOF.

Further, the same operation is performed for the first phase difference region 110 and the second phase difference region 120, and W1 and W2 are obtained.

Further, although the boundary line 130 is in the form of a meandering in FIG. 8, it is not limited to this form, and may be linear.

Preferably, the liquid crystalline compound is contained in the patterned optically anisotropic layer.

As a method of forming the pattern optical anisotropic layer containing a liquid crystal compound, for example, a method of immobilizing a liquid crystal compound in an alignment state can be mentioned. In this case, as a method of immobilizing the liquid crystal compound, a liquid crystal compound having an unsaturated double bond (polymerizable group) is used as the liquid crystal compound so as to be able to be exemplified. Polymerized and immobilized. For example, a method for forming a pattern optical anisotropic layer containing a liquid crystal compound having an unsaturated double bond (polymerizable group) can be applied to a transparent support directly or via an alignment film. Irradiation of free radiation causes it to cure (polymerize) to immobilize the liquid crystalline compound. Furthermore, the patterned optical anisotropic layer may have a single layer structure or a laminate structure.

The type of the unsaturated double bond contained in the liquid crystal compound is not particularly limited, but a functional group capable of undergoing addition polymerization reaction is preferred, and a polymerizable ethylenically unsaturated group or a cyclic polymerizable group is preferred. More specifically, a (meth) acrylonitrile group, a vinyl group, a styryl group, an allyl group or the like is preferable, and a (meth) acrylonitrile group is further preferable.

In general, liquid crystal compounds can be classified into a rod shape and a disk shape according to their shapes. Further, there are a low molecular type and a high molecular type, respectively. Polymer, one Generally, the degree of polymerization is 100 or more ("Polymer physics ‧ phase transfer kinetics", Doi Masao, page 2, Iwanami Bookstore, 1992). In the present invention, any of a rod-like liquid crystal compound and a discotic liquid crystal compound (a discotic liquid crystal compound) can be 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. In order to immobilize the liquid crystal compound, it is preferably formed by using a rod-like liquid crystal compound or a discotic liquid crystal compound having a polymerizable group, and more preferably, the liquid crystal compound has two or more in one molecule. Polymeric group. When the liquid crystal compound is a mixture of two or more kinds, it is preferred that at least one liquid crystal compound has two or more polymerizable groups in one molecule.

As the rod-like liquid crystal compound, for example, paragraph 1 of the patent application of the Japanese Patent Application Laid-Open No. Hei 11-513019, or the paragraph [0026] to paragraph [0098] of Japanese Patent Laid-Open Publication No. 2005-289980 can be preferably used. As a circular disk-shaped liquid crystal compound, for example, paragraphs [0020] to [0067] of Japanese Patent Laid-Open Publication No. 2007-108732 or paragraphs of Japanese Patent Laid-Open Publication No. 2010-244038 can be preferably used. It is described in paragraph [0108], but is not limited to these compounds.

In order to set the in-plane retardation in the pattern optical anisotropic layer to the above range, it is sometimes necessary to control the alignment state of the liquid crystal compound. In the case of using a rod-like liquid crystal compound, it is preferred to immobilize the rod-like liquid crystal compound in a state of being horizontally aligned. When a disc-shaped liquid crystal compound is used, it is preferred to use The disk-shaped liquid crystalline compound is fixed in a state of being vertically aligned. Furthermore, this issue In the present invention, the "horizontal alignment of the rod-like liquid crystal compound" means that the director of the rod-like liquid crystal compound is parallel to the layer, and the "circular alignment of the disc-shaped liquid crystal compound" means circular dish liquid crystal. The disk face of the compound is perpendicular to the layer. It is not required to be strictly horizontal or vertical, and refers to a range of ±20° from a correct angle. It is preferably within ±5°, more preferably within ±3°, more preferably within ±2°, and most preferably within ±1°.

Further, in order to set the liquid crystal compound in a horizontal alignment or a vertical alignment state, an additive (alignment control agent) that promotes horizontal alignment and vertical alignment may be used. As the additive, various known ones can be used.

The following preferred embodiments can be exemplified as the method for forming the pattern optical anisotropic layer, but the method is not limited thereto, and can be formed by various known methods.

The first preferred embodiment is a method in which a plurality of actions for controlling the alignment of the liquid crystalline compound are used, and then any action is eliminated by external stimulation (heat treatment or the like), thereby making the predetermined alignment control action dominant. The role. In the above-mentioned method, for example, the liquid crystal compound is brought into a predetermined alignment state by a combination of the alignment control ability of the alignment film and the alignment control ability of the alignment control agent added to the liquid crystal compound, and the liquid crystal compound is fixed. After forming one of the phase difference regions, any action (for example, the action of the alignment control agent) is lost by external stimulation (heat treatment or the like), and the other alignment control action (the action of the alignment film) becomes dominant. Thereby, another alignment state is realized and fixed to form another phase difference region. For the details of the method, in Japanese Patent Special It is described in paragraph [0017] to paragraph [0029] of the Japanese Patent Publication No. 2012-008170, the contents of which are hereby incorporated by reference.

The second preferred embodiment is a form in which a pattern alignment film is used. In this embodiment, a pattern alignment film having mutually different alignment control capabilities is formed, and a liquid crystal compound is disposed on the pattern alignment film to align the liquid crystal compound. The liquid crystal compound achieves an alignment state different from each other by the alignment control ability of each of the pattern alignment films. By fixing each alignment state, a pattern of the first phase difference region and the second phase difference region is formed corresponding to the pattern of the alignment film. The pattern alignment film can be formed by a printing method, mask rubbing for rubbing an alignment film, mask exposure to a photo alignment film, or the like. In view of the viewpoint of not requiring a large-scale apparatus or the viewpoint of easy manufacture, a method using a printing method is preferred. The details of the method are described in paragraph [0166] to paragraph [0181] of Japanese Patent Laid-Open No. 2012-032661, the contents of which are hereby incorporated by reference.

As a third preferred embodiment, for example, a form in which a photoacid generator is added to an alignment film is used. In this example, a photoacid generator is added to the alignment film, and by pattern exposure, a region where the acid compound is decomposed to generate an acidic compound and a region where no acidic compound is generated are formed. In the unexposed portion of the light, the photoacid generator remains substantially undecomposed, and the interaction between the alignment film material, the liquid crystal compound, and the alignment control agent added as needed dictates the alignment state, and the liquid crystal compound is directed to the slow axis thereof. The directions in which the rubbing directions are orthogonal are aligned. When the alignment film is irradiated with light to generate an acidic compound, the interaction is no longer dominant, and the rubbing direction of the rubbing alignment film governs the alignment state, and the liquid crystal compound has its slow axis aligned parallel to the rubbing direction. Make As the photoacid generator for the alignment film, a water-soluble compound can be preferably used. Examples of the usable photoacid generator include the compounds described in "Prog. Polym. Sci.", Vol. 23, p. 1485 (1998). As the photoacid generator, it is particularly preferred to use a pyridinium salt, a phosphonium salt and a phosphonium salt. The details of the method are described in the specification of Japanese Patent Application No. 2010-289360, the contents of which are incorporated herein by reference.

The thickness of the pattern optical anisotropic layer is not particularly limited, but from the viewpoint of making the optical film thinner, it is preferably 0.1 μm to 10 μm, and more preferably 0.1 μm to 5 μm.

The optical film of the present invention may further include a layer other than the pattern optical anisotropic layer.

For example, a transparent support can also be included. That is, the optical film may be in the form of a transparent support and the patterned optical anisotropic layer disposed on the transparent support. By providing a transparent support, the mechanical strength of the optical film is improved.

Examples of the material for forming the transparent support include a polycarbonate polymer; a polyester such as polyethylene terephthalate or polyethylene naphthalate. (polyester) polymer; acrylic polymer such as polymethyl methacrylate; polystyrene or acrylonitrile-styrene (Acrylonitrile-Styrene, AS) Styrene-based polymers such as resins; polyolefins such as polyethylene, polypropylene, and ethylene-propylene copolymers a polyolefin polymer; a vinyl chloride polymer; an amide polymer such as nylon or aromatic; an imide polymer; ; sulfone polymer; polyether sulfone polymer; polyether ether ketone polymer; polyphenylene sulfide polymer; vinylidene chloride Vinylidene chloride) polymer; vinyl alcohol polymer; vinyl butyral polymer; arylate polymer; polyoxymethylene polymer; epoxy (epoxy) is a polymer or the like.

Further, as a material for forming a transparent support, a thermoplastic norbornene-based resin can be preferably used. Examples of the thermoplastic norbornene-based resin include ZEONEX manufactured by ZEON Co., Ltd., ZEONOR, and ARTON manufactured by JSR Co., Ltd.

Further, as a material for forming a transparent support, a cellulose-based polymer typified by triacetyl cellulose (hereinafter referred to as cellulose acylate) can be preferably used.

The in-plane retardation Re (550) of the transparent support at a wavelength of 550 nm is not particularly limited. However, from the viewpoint of further excellent effects of the present invention, Re (550) as a laminate of the pattern optical anisotropic layer is preferable. Preferably, it is 110 nm to 160 nm, further preferably 120 nm to 150 nm, and particularly preferably 125 nm to 140 nm.

The retardation Rth (550) in the thickness direction of the transparent support at a wavelength of 550 nm is not particularly limited, but the effect of the present invention is more excellent as a figure. The Rth (550) of the laminate of the optically anisotropic layer is preferably 0 nm to 20 nm, more preferably 0 nm to 10 nm, and particularly preferably 0 nm to 5 nm.

The thickness of the transparent support is not particularly limited, but is preferably 1 μm to 60 μm, and more preferably 1 μm to 40 μm from the viewpoint of reducing the thickness of the optical film.

Further, various additives (for example, an optical anisotropy adjuster, a wavelength dispersion adjuster, fine particles, a plasticizer, an ultraviolet absorber, a deterioration inhibitor, a release agent, etc.) may be added to the transparent support.

Further, an alignment film may be provided between the transparent support and the pattern optical anisotropic layer as needed. By providing the alignment film, the control of the alignment direction of the liquid crystalline compound in the pattern optical anisotropic layer becomes easier.

The alignment film is generally a polymer as a main component. The polymer material for an alignment film is described in various documents, and various commercially available products can be purchased. The polymer material utilized is preferably polyvinyl alcohol or polyimine and derivatives thereof. It is especially preferred to be a modified or unmodified polyvinyl alcohol. For the alignment film which can be used in the present invention, reference is made to the description of WO 01/88574 A1, page 43, line 24 to page 49, line 8, and paragraph [0071] to paragraph [0095] of Japanese Patent No. 3907735. Modified polyvinyl alcohol. Further, a known rubbing treatment is usually performed on the alignment film. That is, the alignment film is usually preferably a frictionally treated frictional alignment film.

The thickness of the alignment film is preferably thin, but from the viewpoint of imparting the alignment ability for forming the patterned optical anisotropic layer and relaxing the surface unevenness of the transparent support to form a patterned optical anisotropic layer having a uniform film thickness. , a certain degree of thickness is required. Specifically, the thickness of the alignment film is preferably from 0.01 μm to 10 μm, and further preferably 0.01 μm. ~1 μm, more preferably 0.01 μm to 0.5 μm.

Further, in the present invention, it is also preferable to use a light alignment film. The photo-alignment film is not particularly limited, and those described in paragraphs [0024] to [0043] of WO2005/096041 or the product name LPP-JP265CP manufactured by Rolic Technologies can be used.

Moreover, the optical film of the present invention may also have an antireflection layer. The antireflection layer is preferably an antiglare layer, but may be a low refractive index layer, a medium refractive index layer, or a high refractive index layer.

The antiglare layer preferably contains a binder and translucent particles for imparting antiglare properties, and is formed by protrusions of the translucent particles themselves or protrusions formed by an aggregate of a plurality of particles. Form the surface of the bump.

The refractive index of the high refractive index layer is preferably from 1.70 to 1.74, more preferably from 1.71 to 1.73. The refractive index of the medium refractive index layer is adjusted to a value between the refractive index of the low refractive index layer and the refractive index of the high refractive index layer. The refractive index of the medium refractive index layer is preferably from 1.60 to 1.64, more preferably from 1.61 to 1.63. The refractive index of the low refractive index layer is preferably from 1.30 to 1.47. The refractive index of the low refractive index layer in the case of the multilayer thin film interference type antireflection film (medium refractive index layer/high refractive index layer/low refractive index layer) is preferably from 1.33 to 1.38, more preferably from 1.35 to 1.37.

For the method of forming the high refractive index layer, the medium refractive index layer, and the low refractive index layer, chemical vapor deposition (Chemical Vapor Deposition (CVD)) or physical vapor deposition (physical vapor phase) may also be used. Physical Vapor Deposition (PVD) method, especially vacuum evaporation as a kind of physical evaporation method A transparent film of an inorganic oxide is used for the plating method or the sputtering method, but it is preferably a method of coating by all wet.

As the high refractive index layer, the medium refractive index layer, and the low refractive index layer, those described in paragraphs [0197] to [0211] of JP-A-2009-98658 can be used.

<Circular polarizing film (circular polarizing film for 3D image display device)>

The optical film can be used as a circularly polarizing film by being combined with a polarizing film.

First, the polarizing film used will be described in detail.

The polarizing film (polarizing element layer) may be a member having a function of converting natural light into a specific linearly polarized light, and for example, an absorbing polarizing element can be used.

The type of the polarizing film is not particularly limited, and any of the polarizing films that are generally used, for example, an iodine-based polarizing film, a dye-based polarizing film using a dichroic dye, and a polyene-based polarizing film can be used. . The iodine-based polarizing film and the dye-based polarizing film are generally produced by adsorbing and stretching iodine or a dichroic dye.

Further, the polarizing film is generally used as a polarizing plate in which a protective film is bonded to both surfaces thereof.

The method for producing the circularly polarizing film is not particularly limited. For example, it is preferable to include a step of continuously laminating the optical film and the polarizing film in a long state. The long polarizing plate is cut to match the size of the screen of the image display device used.

Furthermore, it is preferable that one of the in-plane slow axis of the first phase difference region and the in-plane slow axis of the second phase difference region form an angle of +45° with respect to the transmission axis of the polarizing film, the first phase In-plane slow axis of the difference region and in-plane slow axis of the second phase difference region The other one is at an angle of -45° with respect to the transmission axis of the polarizing film. By adopting such a structure, right circular polarization and left circular polarization can be correctly realized. 5 is a view showing the above-described form, showing the relationship between the transmission axis of the polarizing film 140 and the in-plane slow axis of the pattern optical anisotropic layer 100, and the transmission axis of the polarizing film 140 and the pattern optical anisotropic layer 100. The in-plane slow axes of the first phase difference region 110 and the second phase difference region 120 are at an angle of 45° and −45°, respectively. Furthermore, the angle is not limited to 45° and -45°, and may be 45°±10° and −45°±10°.

Further, the optical film is observed from the polarizing film side with respect to the rotation angle of the in-plane slow axis, and the transmission axis of the polarizing film is used as a reference, and is represented by a positive angle value in the clockwise direction and a negative counterclockwise direction. The angle value is used to indicate.

The bonding of the optical film and the polarizing film is preferably a direct bonding or a bonding via a bonding layer or an adhesive layer.

In order to improve the adhesion between the optical film and the polarizing film, it is preferred to subject the surface of the transparent support to surface treatment (for example, glow discharge treatment, corona discharge treatment, plasma treatment). , Ultraviolet (UltraViolet, UV) treatment, flame treatment, saponification, solvent cleaning).

As the adhesive layer, for example, a ratio (tan δ=G"/G') of the storage elastic modulus G' and the loss elastic modulus G" measured by the dynamic viscoelasticity measuring device is 0.001 to 1.5, and includes a so-called Adhesive or substance that is easy to creep. The adhesive which can be used in the present invention is, for example, a polyvinyl alcohol-based adhesive, but is not limited thereto.

<3D image display device>

The invention also relates to a 3D image display device having the optical film. The film of the present invention is disposed on the visible side of the display panel, and has a function of converting the image displayed on the display panel into a circularly polarized image for the right eye and a circularly polarized image for the left eye. The observer observes the images through a polarizing plate such as circular polarized glasses, and recognizes them as stereoscopic images.

The pixel pitch of the display panel used for the 3D image display device is not particularly limited, but is preferably from 10 μm to 250 μm, more preferably from 10 μm to 130 μm, from the viewpoint of being suitable for combination with the optical film. Good is 10μm~80μm.

Further, as the relationship between the pixel pitch of the display panel and each region in the pattern optical anisotropic layer, the width of the image pitch, the first phase difference region in the pattern optical anisotropic layer, and the second portion are preferable. The width of the width of the region of one of the phase difference regions and the width of the boundary line are substantially the same, and the width of the total value width is preferably within ±20% with respect to the width of the image space, and is preferably at least ± Within 10%, more preferably within ±5%.

In the present invention, there is no limitation on the display panel. For example, it may be a liquid crystal panel including a liquid crystal layer, an organic EL display panel including an organic electroluminescence (EL) layer, or a plasma display panel. For any form, a variety of possible configurations can be employed. Further, in the case where the liquid crystal panel of the transmission mode is equal to the form in which the visible side surface has a polarizing film for image display, the optical film of the present invention can also achieve the above function by being combined with the polarizing film.

[Examples]

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

<Example 1>

(Preparation of coating liquid for anti-glare hard coat layer)

A mixed solvent of each component with methyl isobutyl ketone (Methyl Isobutyl Ketone, MIBK) and methyl ethyl ketone (Methyl Ethyl Ketone, MEK) (89 to 11 (mass ratio)) in such a manner as to have the following composition Mix. Filtration was carried out using a polypropylene filter having a pore size of 30 μm to prepare a coating liquid 1 for an antiglare hard coat layer. The solid content concentration of the coating liquid was 40% by mass.

Furthermore, the x, y, z, and n are 25, 25, 50, and 8, respectively.

(application of anti-glare hard coat)

The commercially available deuterated cellulose TD60 (manufactured by Fujifilm Co., Ltd.) (film thickness: 60 μm) was wound up in a roll form, and the coating liquid 1 for an anti-glare hard coat layer was used to have a film thickness of 4 μm. The way to apply an anti-glare hard coat.

Specifically, the coating is carried out at a conveying speed of 30 m/min by a die coating method using a slot die described in Example 1 of JP-A-2006-122889. The liquid 1 was coated on a support (deuterated cellulose TD60), and dried at 80 ° C for 150 seconds, and then an air-cooled metal halide lamp (metal) having an oxygen concentration of about 0.1% and 160 W/cm under nitrogen purge was used. A halide lamp (manufactured by Eyegraphics Co., Ltd.), which irradiates an ultraviolet ray having an illuminance of 400 mW/cm ² and an irradiation amount of 180 mJ/cm ² to cure the coating layer to form an antiglare hard coat layer, and then winds it. A support 1 with an anti-glare hard coat layer was produced.

(Production of Support 1 by Saponification by Alkali)

The prepared support 1 with an anti-glare hard coat layer was passed through an induction electric heating roller at a temperature of 60 ° C, and the surface temperature was raised to 40 ° C, and then the support 1 with an anti-glare hard coat layer was attached. On the opposite side of the surface on which the antiglare hard coat layer was formed, the alkali solution of the composition shown below was continuously applied by a wire bar of #6 and heated to 110 ° C, and It was transported under a steam-type far-infrared heater manufactured by Noritake Co., Ltd. for 10 seconds. Then, 3 ml/m ² of pure water was also applied using a bar coater. Then, it was washed three times with water washing by a fountain coater and water removal by an air knife, and then conveyed in a drying zone of 70 ° C for 10 seconds to dry. The alkali saponified support 1 was produced.

(Production of support 1 with pre-exposure alignment film)

On the surface of the prepared alkali-saponified support 1 which was subjected to the saponification treatment, the coating liquid 1 for forming an alignment film having the following composition was continuously applied by a wire bar. The film was dried by a warm air of 60 ° C for 60 seconds, and further dried with a warm air of 100 ° C for 120 seconds to form a support 1 having an alignment film before exposure. The wire rod was adjusted so that the film thickness of the alignment film before exposure was 0.45 μm.

[Chemical 2]

(UV exposure)

Next, a stripe mask having a transverse stripe width of the transmissive portion of 96.2 μm and a horizontal stripe width of the shielding portion of 96.2 μm was placed on the prepared support 1 with the pre-exposure alignment film, and air was taken at room temperature. Next, an ultraviolet irradiation device (Light Hammer 10, 240 W/cm, manufactured by Fusion UV Systems, Inc.) having an illuminance of 500 mW/cm ² in a wavelength region of 200 nm to 400 nm is used as a light source unit. Ultraviolet rays of 0.06 seconds (30 mJ/cm ² irradiation amount) were irradiated to form a pattern alignment film.

(Formation of the striped pattern optical anisotropic layer 1)

The pattern alignment film after the ultraviolet ray exposure was subjected to one rubbing treatment in one direction at a speed of 500 rpm at an angle of 45° with respect to the stripe of the stripe mask. Then, the coating liquid for an optical anisotropic layer of the following pattern was applied by a wire bar. Further, after heating and aging for 2 minutes at a film surface temperature of 110 ° C, the mixture was cooled to 80 ° C, and irradiated with air-cooled metal halide lamp (manufactured by Eyegraphics Co., Ltd.) of 20 mW/cm ² under air. In the second-order ultraviolet ray, the alignment state is fixed, whereby the stripe-shaped pattern optical anisotropic layer 1 is formed. In the mask exposure portion (first phase difference region), the in-plane slow axis direction is parallel to the rubbing direction, the disk-shaped liquid crystal compound is vertically aligned, and the unexposed portion (second phase difference region) is orthogonally perpendicular. Orientation. Further, the wire rod was adjusted so that the film thickness of the optically anisotropic layer 1 was 1.15 μm.

[Chemical 3]

(production of optical film 1)

The optical film 1 was formed as described above, and the optical film 1 was formed with an antiglare hard coat layer on one surface of the support, and a stripe pattern optical anisotropic layer was formed on the back surface.

(Evaluation 1 of optical film 1)

For the optical film 1 to be produced, KOBRA-21ADH (manufactured by Oji Scientific Instruments Co., Ltd.) was used, the tilt angle of the disk-shaped liquid crystal at the interface of the alignment film, the inclination of the disk-shaped liquid crystal at the air interface, and Re ( 550) The measurement was performed separately, and as a result, the inclination angle of the disk-shaped liquid crystal at the air interface and the alignment film interface was vertical, and Re (550) was 130 nm. Further, the vertical direction means that the inclination angle is 70° to 90°.

The optically anisotropic layer of the stripe pattern of the optical film 1 to be produced is The in-plane slow axis of one of the phase difference region or the second phase difference region is placed between the polarizing plates so as to be parallel to the transmission axes of any of the two polarizing plates that are orthogonally arranged. Further, a sensitive color plate having a phase difference of 530 nm was provided on the pattern optical anisotropic layer so that the in-plane slow axis and the transmission axis of the polarizing plate were at an angle of 45°. Next, a state in which the pattern optical anisotropic layer was rotated by +45° and a state of -45° rotation was observed by a polarizing microscope (ECLIPE E600W POL manufactured by NIKON), and as a result, when the rotation was +45°, The in-plane slow axis of the first phase difference region is parallel to the in-plane slow axis of the sensitive color plate, so that the phase difference becomes larger than 530 nm, the color thereof becomes blue, and the in-plane slow axis and sensitivity of the second phase difference region are The in-plane slow axis of the swatch is orthogonal, so the phase difference becomes less than 530 nm and its color changes to yellow. Further, when the rotation was -45°, the opposite phenomenon was observed. Therefore, it was confirmed that the in-plane slow axes of the first phase difference region and the second phase difference region were +45° with respect to the transmission axis of the polarizing plate, respectively. -45° angle.

Next, in the state where the sensitive color plate is removed, the stripe pattern optical anisotropic layer of the produced optical film 1 is slow in the in-plane of any of the first phase difference region or the second phase difference region. The transmission axis of any one of the two polarizing plates combined in an orthogonal position is parallel, and is provided on a polarizing microscope (ECLIPE E600W POL manufactured by NIKON). At this time, the first phase difference region and the second phase difference region appear dark, and the boundary line appears brighter. Further, the observed image was introduced to a PC by a digital camera (NIKON DIGITAL CAMERA) DXM1200 mounted on a polarizing microscope. Based on this image, using image analysis software WinROOF (Sangu Trading Co., Ltd.), Lee According to the above method, the width W1 of the first phase difference region, the width W2 of the second phase difference region, and the width W3 of the boundary line in the stripe pattern optical anisotropic layer shown in FIG. 4 are measured. The width W1 and the width W2 measured by the above method were 91.2 μm, and the width W3 was 5.0 μm.

According to the above results, it can be understood that after the polyvinyl alcohol (PVA)-based rubbing alignment film containing the photoacid generator is subjected to mask exposure, the alignment film is subjected to rubbing treatment in one direction. The circular dish liquid crystal is aligned to obtain a patterned optical anisotropic layer having a first phase difference region (Re (550) which is vertically aligned and whose in-plane slow axis is orthogonal ) = 130 nm) and the second phase difference region (Re (550) = 130 nm).

(Production of 3D video display device 1)

The optically anisotropic layer side of the stripe pattern of the optical film 1 produced as described above was bonded to the visible side polarizing plate of a tablet model of a Retina display model manufactured by Apple Inc. The 3D image display device 1 shown in Table 1. At the time of bonding, the in-plane slow axis of the first phase difference region and the in-plane slow axis of the second phase difference region are arranged at 45° and −45° with respect to the transmission axes of the polarizing plates in the flat plate, respectively. Further, with respect to the angle, the transmission axis of the polarizing film is set to 0° of the reference, and the display is viewed from the optical film 1 side, and is represented by a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction. To represent. Further, the centers of the widths of the first phase difference region and the second phase difference region are arranged to coincide with the center of the pixel pitch width of the display panel. The 3D video display device 2 to 3D video display device 10 to be described later also has a first phase difference region and a second phase difference region. The relationship between the in-plane slow axis and the transmission axis of the polarizing plate, and the positional relationship between the first phase difference region, the second phase difference region, and the pixel pitch of the display panel are bonded to each other.

A partially enlarged cross-sectional view of the formed 3D image display device 1 is shown in Fig. 6 . The configuration of the 3D video display device 10d is substantially the same as that of FIG. 1 except that the optical film 100 is used, and the same members are denoted by the same reference numerals. In addition, in FIG. 6, only the stripe pattern optical anisotropic layer in the optical film 1 is described, and another structure (for example, an alignment film) is abbreviate|omitted. W3 in Fig. 6 indicates the width of the boundary line, W4 indicates the pixel pitch, W5 indicates the width of the black matrix (BM), T1 indicates the thickness of the glass substrate, and T2 indicates the thickness of the polarizing film.

<Example 2>

(production of optical film 2)

A stripe mask having a horizontal stripe width of 96.2 μm in the transmissive portion and a stripe width of 96.2 μm in the shielding portion, and a stripe mask having a width of 77.9 μm in the transmissive portion and a lateral stripe width of 77.9 μm in the shielding portion. In the same manner as in Example 1, an optical film 2 having a stripe-shaped pattern optical anisotropic layer 2 was produced. In the stripe pattern optically anisotropic layer 2, the width W1 and the width W2 were 72.9 μm, and the width W3 was 5.0 μm.

(Evaluation of Optical Film 2)

The optical film 2 produced was subjected to the same evaluation as the above (evaluation 1 of the optical film 1), and as a result, the in-plane slow axis of the first phase difference region and the in-plane slow axis of the second phase difference region were orthogonal. , the air interface and the angle of the disc-shaped liquid crystal at the interface of the alignment film For vertical, Re (550) is 130 nm.

(Production of 3D video display device 2)

The 3D image display device 2 shown in Table 2 was produced by attaching the stripe-shaped pattern optical anisotropic layer side of the optical film 2 produced as described above to the visible side polarizing plate of the Apple-made smart phone iPhone5.

<Example 3>

(Production of Optical Film 3)

An optical anisotropy having a striped pattern was produced in the same manner as in Example 2 except that the ZEONOR film ZF14 (manufactured by ZEON Co., Ltd.) (thickness: 100 μm) was used instead of the deuterated cellulose TD60. Optical film 3 of layer 3. In the stripe pattern optically anisotropic layer 3, the width W1 and the width W2 were 72.9 μm, and the width W3 was 5.0 μm.

(Evaluation of Optical Film 3)

The same evaluation as the above (evaluation 1 of the optical film 1) was performed on the optical film 3 produced, and as a result, the in-plane slow axis of the first phase difference region and the in-plane slow axis of the second phase difference region were orthogonal. The angle of the disc-shaped liquid crystal at the air interface and the alignment film interface is vertical, and Re (550) is 128 nm.

(Production of 3D video display device 3)

The 3D image display device 3 shown in Table 2 was produced by attaching the stripe pattern optical anisotropic layer side of the optical film 3 produced as described above to the visible side polarizing plate of the smart phone i Phone 5 manufactured by Apple Inc. .

<Example 4>

(Production of Optical Film 4)

An optically anisotropic layer having a striped pattern was produced in the same manner as in Example 2 except that ACRYPET VH (manufactured by Mitsubishi Rayon Co., Ltd.) (thickness: 60 μm) was used instead of the deuterated cellulose TD60. 4 optical film 4. In the stripe pattern optically anisotropic layer 4, the width W1 and the width W2 were 72.9 μm, and the width W3 was 5.0 μm.

(Evaluation of Optical Film 4)

The same evaluation as the above (evaluation 1 of the optical film 1) was performed on the optical film 4 produced, and as a result, the in-plane slow axis of the first phase difference region and the in-plane slow axis of the second phase difference region were orthogonal. The angle of the disc-shaped liquid crystal at the air interface and the alignment film interface is vertical, and Re (550) is 130 nm.

(Production of 3D video display device 4)

The 3D image display device 4 shown in Table 2 was produced by attaching the stripe-shaped pattern optical anisotropic layer side of the optical film 4 produced as described above to the visible side polarizing plate of the Apple-made smart phone iPhone5.

<Example 5>

(Production of Optical Film 5)

A stripe-like pattern was produced in the same manner as in Example 2 except that a polyethylene terephthalate film (manufactured by Fujifilm Co., Ltd.) (thickness: 75 μm) was used instead of the deuterated cellulose TD60. Optical film 5 of optical anisotropic layer 5. In the stripe pattern optically anisotropic layer 5, the width W1 and the width W2 were 72.9 μm, and the width W3 was 5.0 μm.

(Evaluation of Optical Film 5)

The same evaluation as the above (evaluation 1 of the optical film 1) was performed on the optical film 5 produced, and as a result, the in-plane slow axis of the first phase difference region and the in-plane slow axis of the second phase difference region were orthogonal. The angle of the disc-shaped liquid crystal at the air interface and the alignment film interface is vertical, and Re (550) is 138 nm.

(Production of 3D video display device 5)

The 3D image display device 5 shown in Table 2 was produced by attaching the stripe-shaped pattern optical anisotropic layer side of the optical film 5 produced as described above to the visible side polarizing plate of the smart phone i Phone 5 manufactured by Apple Inc. .

<Example 6>

(Production of Optical Film 6)

In the above (ultraviolet light exposure), the illuminance in the wavelength region of 200 nm to 400 nm was changed from 500 mW/cm ² to 150 mW/cm ² , and the irradiation time was changed from 0.06 seconds (the irradiation amount of 30 mJ/cm ² ) to 0.14 second. An optical film 6 having a stripe-shaped pattern optical anisotropic layer 6 was produced in the same manner as in Example 2 except that the clock (the amount of irradiation was 21 mJ/cm ² ) was used. In the stripe-shaped pattern optical anisotropic layer 6, the width W1 and the width W2 were 69.9 μm, and the width W3 was 8.0 μm.

(Evaluation of Optical Film 6)

The same evaluation as the above (evaluation 1 of the optical film 1) was performed on the optical film 6 produced, and as a result, the in-plane slow axis of the first phase difference region and the in-plane slow axis of the second phase difference region were orthogonal. The angle of the disc-shaped liquid crystal at the air interface and the alignment film interface is vertical, and Re (550) is 125 nm.

(Production of 3D video display device 6)

The 3D image display device 6 shown in Table 2 was produced by attaching the stripe-shaped pattern optical anisotropic layer side of the optical film 6 produced as described above to the visible side polarizing plate of the Apple-made smart phone iPhone 5.

<Example 7>

(Production of Optical Film 7)

In the above (ultraviolet light exposure), the same operation as in Example 6 was carried out except that the irradiation time was changed from 0.14 seconds (the irradiation amount 21 mJ/cm ² ) to 0.12 seconds (the irradiation amount was 18 mJ/cm ² ). An optical film 7 having a stripe-shaped pattern optical anisotropic layer 7 was produced. In the stripe-shaped pattern optical anisotropic layer 7, the width W1 and the width W2 were 67.9 μm, and the width W3 was 10.0 μm.

(Evaluation of Optical Film 7)

The same evaluation as the above (evaluation 1 of the optical film 1) was performed on the optical film 7 produced, and as a result, the in-plane slow axis of the first phase difference region and the in-plane slow axis of the second phase difference region were orthogonal. The angle of the disc-shaped liquid crystal at the air interface and the alignment film interface is vertical, and Re (550) is 125 nm.

(Production of 3D video display device 7)

The 3D image display device 7 shown in Table 2 was produced by attaching the stripe-shaped pattern optical anisotropic layer side of the optical film 7 produced as described above to the visible side polarizing plate of the smart phone iPhone 5 manufactured by Apple Inc.

<Comparative Example 1>

(Production of support 8 with photo-alignment film)

The saponified surface of the alkali saponified support 1 produced in Example 1 was continuously coated with polyetherene and acrylate described in Japanese Patent Laid-Open Publication No. 2012-517024 by a wire rod. The coating liquid 2 for photoalignment film formation which has a monomer as a main component. It was dried by warm air at 80 ° C for 120 seconds to form a support 8 with a cinnamate photoalignment film. The wire rod was adjusted so that the film thickness of the polycinnamate photoalignment film (pre-exposure photo-alignment film) was 0.1 micrometer.

(Polarized UV exposure)

Next, a stripe mask having a transverse stripe width of the transmissive portion of 96.2 μm and a horizontal stripe width of the shielding portion of 96.2 μm was placed on the prepared support 8 with the polycinnamate photoalignment film. An ultraviolet-shielded metal halide lamp (manufactured by Eyegraphics Co., Ltd.) of 160 W/cm ² was used to irradiate ultraviolet rays at room temperature under air. At this time, a wire grid polarizing element (ProFlux PPL02 manufactured by Moxtek Co., Ltd.) is set in the direction 1 as shown in Fig. 7 (a), and further passes through the mask A (transverse portion of the transmissive portion). The exposure was performed by a stripe mask having a stripe width of 96.2 μm and a horizontal stripe width of the masking portion of 96.2 μm. Subsequently, as shown in FIG. 7(b), the wire grid polarizing element is disposed in the direction 2, and further passes through the mask B (the stripe width of the transmissive portion is 96.2 μm, and the stripe width of the mask portion is 96.2 μm). ) to expose. The distance between the exposure mask surface and the photo-alignment film was set to 200 μm. The illuminance of the ultraviolet ray used at this time was 100 mW/cm ² in the UV-A region (accumulation of wavelengths of 380 nm to 320 nm), and the irradiation amount was 1000 mJ/cm ² in the UV-A region, thereby forming a pattern alignment film.

(Formation of the stripe pattern optical anisotropic layer 8)

On the pattern alignment film after the ultraviolet ray exposure, the coating liquid for a patterned optical anisotropic layer described in JP-A-2012-517024 is applied by a wire rod. Further, after drying at a film surface temperature of 105 ° C for 120 seconds to be in a liquid crystal phase state, the film was cooled to 75 ° C, and an air-cooled metal halide lamp of 160 W/cm ² was used under air (Eyegraphics). The ultraviolet light is irradiated, and the alignment state is fixed, whereby the optical film 8 having the stripe-shaped pattern optical anisotropic layer 8 is produced. Further, the wire rod was adjusted so that the film thickness of the patterned optical anisotropic layer was 1.3 μm. Further, in the stripe-shaped pattern optical anisotropic layer 8, the width W1 and the width W2 were 83.2 μm, and the width W3 was 13.0 μm.

(Production of Optical Film 8)

The optical film 8 is formed in the above manner, and the optical film 8 is formed on one side of the support. An anti-glare hard coat layer is formed and a striped pattern optical anisotropic layer is formed on the back surface.

The optical film 8 was observed by a polarizing microscope according to the same procedure as that performed in (Evaluation 1 of the optical film 1), and it was confirmed that the first phase difference region and the second phase were perpendicular to the transmission axis of the polarizing plate. The in-plane slow axes of the difference regions are at an angle of +45° and -45°, respectively. In other words, the in-plane slow axis of the first phase difference region and the in-plane slow axis of the second phase difference region are orthogonal to each other.

(Evaluation of Optical Film 8)

For the optical film 8 to be produced, KOBRA-21ADH (manufactured by Oji Scientific Instruments Co., Ltd.) was used, and the inclination angle of the rod-like liquid crystal compound at the interface of the alignment film and the inclination of the rod-like liquid crystal compound at the air interface were obtained according to the above method. When Re (550) was measured, the inclination angle of the rod-like liquid crystal compound at the air interface and the alignment film interface was horizontal, and Re (550) was 130 nm. Furthermore, the so-called level means that the inclination angle is 0° to 20°.

(Production of 3D video display device 8)

The 3D image shown in Table 1 was produced by attaching the stripe-shaped pattern optical anisotropic layer side of the optical film 8 produced in the manner described above on the visible side polarizing plate of the tablet type iPad Retina display model manufactured by Apple Inc. Display device 8.

<Comparative Example 2>

(Production of Optical Film 9)

In the above (ultraviolet light exposure), the same operation as in Example 6 was carried out except that the irradiation time was changed from 0.14 seconds (the irradiation amount 21 mJ/cm ² ) to 0.10 seconds (the irradiation amount was 15 mJ/cm ² ). An optical film 9 having a stripe-shaped pattern optical anisotropic layer 9 was produced. In the stripe-shaped pattern optical anisotropic layer 9, the width W1 and the width W2 were 64.9 μm, and the width W3 was 13.0 μm.

(Evaluation of Optical Film 9)

The same evaluation as the above (evaluation 1 of the optical film 1) was performed on the optical film 9 produced, and as a result, the in-plane slow axis of the first phase difference region and the in-plane slow axis of the second phase difference region were orthogonal. The angle of the disc-shaped liquid crystal at the air interface and the alignment film interface is vertical, and Re (550) is 125 nm.

(Production of 3D video display device 9)

The 3D image display device 9 shown in Table 2 was produced by attaching the stripe-shaped pattern optical anisotropic layer side of the optical film 9 produced as described above to the visible side polarizing plate of the Apple-made smart phone iPhone 5.

<Comparative Example 3>

(Production of Optical Film 10)

The optical film 10 having the stripe-shaped pattern optical anisotropic layer 10 was produced by the same operation as in Comparative Example 1, except that the stripe width of the mask A and the mask B was changed from 96.2 μm to 77.9 μm. In the stripe-shaped pattern optical anisotropic layer 10, the width W1 and the width W2 were 64.9 μm, and the width W3 was 13.0 μm.

(Evaluation of Optical Film 10)

For the optical film 10 to be produced, KOBRA-21ADH (manufactured by Oji Scientific Instruments Co., Ltd.) was used, and the inclination angle of the rod-like liquid crystal at the interface of the alignment film, the inclination angle of the rod-like liquid crystal at the air interface, and Re (550) were measured. As a result, the inclination of the liquid crystal at the air interface and the alignment film interface was horizontal, and Re (550) was 130 nm. Again, the so-called Horizontal, indicating a tilt angle of 0 ° ~ 20 °.

(Production of 3D video display device 10)

The 3D image display device 10 shown in Table 2 was produced by attaching the stripe-shaped pattern optical anisotropic layer side of the optical film 10 produced as described above to the visible side polarizing plate of the Apple-made smart phone iPhone 5.

<Evaluation of 3D image display device>

(Evaluation of crosstalk in the up and down direction)

In the 3D image display device produced as described above, a full-screen white display as a right-eye image/a full-screen black display as a left-eye image is displayed, and a brightness meter is manufactured by Topcon Technohouse. The right eye portion of the 3D glasses is attached to the lens of the BM-5A, and the brightness is measured every 1° in the range of the polar angle +3° to -3° in the up and down direction. Similarly, the left eye portion of the 3D glasses was attached to the lens of the BM-5A, and the brightness was measured every 1° in the range of the polar angle +3° to -3° in the up and down direction. The luminance measured by the left eye portion of the 3D glasses is divided by the luminance measured in the right eye portion of the 3D glasses and multiplied by 100 as the crosstalk ((the luminance X measured in the left eye portion / in the right eye portion) The measured luminance Y) × 100) (%). When the crosstalk is less than 5%, the evaluation is "A", when it is 5% or more and less than 6%, it is evaluated as "B", and when it is 6% or more and less than 7%, it is evaluated as "C". In the case of % or more, the evaluation is "D". The results of the measurement are shown in Tables 1 to 2. In practical terms, it is desirable to have no "D".

Further, in Examples 2 to 7 and Comparative Examples 2 to 3, the luminance was measured every 1° in the range of the polar angle +2° to -2°.

Further, the evaluation results at a polar angle of 1° and the evaluation results at -1°, the evaluation results at a polar angle of 2°, the evaluation results at -2°, the evaluation results at a polar angle of 3°, and the results at -3° The evaluation results were the same results, respectively. Therefore, only the results of the polar angles of 1°, 2°, and 3° are shown in Table 1 below, and only the results of the polar angles of 1° and 2° are shown in Table 2.

Further, the width W4, the thickness T1, the thickness T2, and the width W5 in Tables 1 and 2 indicate the sizes of the respective structures shown in Fig. 6.

From the results of Tables 1 to 2, it was confirmed that, in the case of using the optical film of the present invention, the occurrence of crosstalk can be suppressed even in a high-definition display panel having a short image pitch.

On the other hand, the comparison between the first embodiment and the comparative example 1 and the comparison between the second to seventh embodiments and the comparative example 2 to the comparative example 3 confirmed that when the width of the boundary line is equal to or greater than a predetermined value, Crosstalk occurs as the polar angle becomes larger. In the case where the width of the boundary line is 8 μm or less (more preferably 5 μm or less), the occurrence of crosstalk can be further suppressed.

100‧‧‧pattern optical anisotropic layer

110‧‧‧1st phase difference zone

120‧‧‧2nd phase difference zone

130‧‧‧ boundary line

W1‧‧‧Width of the first phase difference zone

W2‧‧‧ width of the second phase difference zone

W3‧‧‧ boundary line width

Claims (12)

A three-dimensional image display device comprising: at least: a display panel; and an optical film disposed on a visible side of the display panel and having a patterned optical anisotropic layer, the patterned optical anisotropic layer having an in-plane slow axis direction and The first phase difference region and the second phase difference region are different from each other in at least one of the in-plane delays, and the first phase difference region and the second phase difference region are alternately arranged in a stripe shape in the same plane. The width of the first phase difference region and the width of the second phase difference region are 50 μm to 250 μm, and are located at a boundary between the first phase difference region and the second phase difference region, and include an unaligned region. The boundary line has a width of 0.1 μm to 10 μm. The three-dimensional image display device according to claim 1, wherein the in-plane slow axis direction of the first phase difference region and the in-plane slow axis direction of the second phase difference region are orthogonal to each other. The three-dimensional image display device according to the first or second aspect of the invention, wherein the first retardation region and the second retardation region have an in-plane retardation Re(550) of 110 nm at a wavelength of 550 nm. 160nm. The three-dimensional image display device according to the first or second aspect of the invention, wherein the width of the first phase difference region and the width of the second phase difference region are 50μm~80μm. The three-dimensional image display device of claim 1, wherein the patterned optical anisotropic layer is disposed on a transparent support. The three-dimensional image display device according to claim 1 or 2, wherein the display panel has a pixel pitch of 10 μm to 250 μm. An optical film having a patterned optical anisotropic layer, wherein the patterned optically anisotropic layer has a first phase difference region and a second phase which are different from each other in at least one of an in-plane slow axis direction and an in-plane retardation In the difference region, the first phase difference region and the second phase difference region are alternately arranged in a stripe shape in the same plane, and a width of the first phase difference region and a width of the second phase difference region are 50 μm. ~250 μm, the width of the boundary line including the non-alignment region located at the boundary between the first phase difference region and the second phase difference region is 0.1 μm to 10 μm. The optical film according to claim 7, wherein the in-plane slow axis direction of the first phase difference region and the in-plane slow axis direction of the second phase difference region are orthogonal to each other. The optical film according to claim 7 or 8, wherein the first retardation region and the second retardation region have an in-plane retardation Re (550) at a wavelength of 550 nm of 110 nm to 160 nm. An optical film as described in claim 7 or 8, wherein The width of the first phase difference region and the width of the second phase difference region are 50 μm to 80 μm. The optical film of claim 7 or 8, wherein the patterned optically anisotropic layer is disposed on a transparent support. A circularly polarizing film comprising the optical film according to any one of claims 7 to 10, and a polarizing film, wherein the in-plane slow axis of the first phase difference region and the second phase One of the in-plane slow axes of the difference region is at an angle of +45° with respect to the transmission axis of the polarizing film, and the in-plane slow axis of the first phase difference region and the surface of the second phase difference region The other of the inner slow axes is at an angle of -45° with respect to the transmission axis of the polarizing film.