JP5871480B2 - Image display device and 3D image display system - Google Patents

Description

  The present invention makes it possible to achieve both of the antireflection performance and the effect of suppressing crosstalk or reducing the decrease in luminance when a 3D image is displayed on a display device having a translucent protective substrate in front of the viewing side of the image display unit. Related to technology.

  As a display device, a 3D image display device capable of displaying a stereoscopic image (3D image) is provided. In many cases, a 3D image display device is required to have a high-quality appearance. For the purpose of improving aesthetics and the like, an image display device has been proposed in which a translucent protective portion is arranged in front of the viewing side of an image display portion such as a liquid crystal display panel. In an image display device having a translucent protective part, a gap is generally present between the protective part and the image display part. However, the presence of this gap causes light reflection at the refractive index interface. There arises a problem that the contrast is lowered. In order to solve this problem, it has been proposed to fill the voids with a cured resin (for example, Patent Document 1).

  Patent Document 2 discloses a display device having a predetermined configuration in which an antireflection layer is formed on the outermost surface of the display device. In such a display device, light reflected from the outermost surface of the display device or a protective cover is removed. It is described that it is possible.

  By the way, the antireflection layer is generally formed by coating or the like, and a support such as a polymer film for supporting the antireflection layer is required (for example, Patent Document 3). Therefore, when incorporating an antireflection layer into an image display device, it is common to incorporate it with a support.

JP 2005-55641 A JP 2010-97160 A JP 2004-345278 A

As a result of intensive studies by the present inventor, when an antireflection layer is disposed in order to prevent light reflection from the front surface and / or the back surface of the translucent protective substrate disposed in front of the viewing side of the image display unit, 3D It has been found that in the image display device, crosstalk between the left and right images or a decrease in luminance occurs.
An object of the present invention is to solve this problem, that is, a light-reflective performance of a display device having a translucent protective substrate in front of the viewing side of the image display unit, and crosstalk or 3D image display. It is an object of the present invention to provide a technique that enables compatibility with the luminance reduction suppression effect. Specifically, the present invention provides an image display device and a 3D image display system that exhibit good anti-reflection properties and reduce the occurrence of crosstalk or luminance reduction during 3D image display. This is the issue.

  As a result of intensive studies by the present inventor, the optical characteristics of the support of the antireflection layer incorporated together with the antireflection layer have an influence on the occurrence of crosstalk between the left and right images when the 3D image is displayed, or the occurrence of luminance reduction. I understood it. As a result of further studies based on this knowledge, one or more antireflection layers are arranged, and the sum of Rth and Re of all members from the image display unit to the protective layer outermost layer is within a predetermined range. The inventors have found that the crosstalk of the left and right images during 3D image display or the reduction in luminance can be reduced while achieving antireflection performance by disposing the antireflection layer, and have completed the present invention.

Means for solving the above-mentioned problems are as follows.
[1] An image display device having an image display unit and at least a first polarizing film and a translucent protective substrate in this order in front of the viewing side of the image display unit,
At least one antireflection layer is disposed between the first polarizing film and the translucent protective substrate, or further on the front side of the viewing side of the translucent protective substrate;
The absolute value of the sum of the thickness direction retardations Rth (550) at a wavelength of 550 nm of all members disposed on the front side of the first polarizing film on the viewing side is 20 nm or less; and the first polarizing film When the first λ / 4 layer is provided between the protective substrate or in front of the protective substrate and further on the viewing side, the first polarizing film is disposed in front of the viewing side of the first polarizing film. The absolute value of the sum of the in-plane retardations Re (550) at a wavelength of 550 nm of all members other than one λ / 4 layer is 10 nm or less; or between the first polarizing film and the protective substrate Or, if the first λ / 4 layer is not further provided in front of the protective substrate on the viewing side, Re (550) of all members disposed on the viewing side in front of the first polarizing film. ) Is an absolute value of 10 nm or less. Display device.
[2] The image display according to [1], comprising a polymer film supporting the at least one antireflection layer or the first λ / 4 layer, wherein the Rth (550) of the polymer film has an absolute value of 10 nm or less. apparatus.
[3] A polymer film that has a polymer film that supports the at least one antireflection layer or the first λ / 4 layer, and further exhibits Rth (550) that is different from Rth (550) of the polymer film. The image display device according to [1] or [2].
[4] The image display device according to any one of [1] to [3], wherein the total reflectance of the at least one antireflection layer is 3% or less.
[5] The image display device according to any one of [2] to [4], wherein the polymer film is a polymer film containing a cellulose acylate, an acrylic polymer, or a cyclic olefin polymer as a main component.
[6] The image display device according to any one of [1] to [5], wherein the λ / 4 layer is a layer made of a composition containing a liquid crystal compound.
[7] The image display device according to [5], wherein the λ / 4 layer is a layer formed by fixing a composition containing a discotic liquid crystal compound in a vertically aligned state.
[8] The image display device according to [5], wherein the λ / 4 layer is a layer formed by fixing a composition containing a rod-like liquid crystal compound in a horizontal alignment state.
[9] The image display device according to any one of [1] to [5], wherein the λ / 4 layer is optically formed of a uniaxial or biaxial retardation film.
[10] The image display device according to any one of [2] to [4], wherein the λ / 4 layer is a retardation film containing cellulose acylate, cyclic olefin polymer, polypropylene, or polycarbonate as a main component.
[11] The image according to any one of [1] to [10], wherein an angle formed between the absorption axis of the first polarizing film and the slow axis of the first λ / 4 layer is 45 ° or 135 °. Display device.
[12] A 3D having at least the image display device according to any one of [1] to [11] and a second polarizing film for allowing a video displayed on the image display device to pass through and visually recognize the image as a 3D image. Image display system.
[13] A first λ / 4 layer is provided between the first polarizing film of the image display device and the translucent protective substrate, or further on the front side of the viewing side of the translucent protective substrate, and the first λ. / 4 layer and the second polarizing film have a second λ / 4 layer, and each of the first λ / 4 layer and the second λ / 4 layer has a slow axis. [3] The 3D image display system according to [12], which is arranged orthogonally to each other.

  According to the present invention, a display device having a translucent protective substrate in front of the viewing side of the image display unit can achieve both the antireflection performance and the effect of suppressing crosstalk or luminance reduction when displaying 3D images. Technology can be provided. Specifically, according to the present invention, there are provided an image display device and a 3D image display system that exhibit good anti-reflection properties and reduce the occurrence of crosstalk or luminance reduction during 3D image display. Can be provided.

It is a cross-sectional schematic diagram of an example of the image display apparatus and 3D image display system of this invention. It is a cross-sectional schematic diagram of an example of the anti-reflective board which can be used for the image display apparatus of this invention. It is a cross-sectional schematic diagram of the other example of the image display apparatus and 3D image display system of this invention. It is a cross-sectional schematic diagram of an example of (lambda) / 4 board which can be used for the image display apparatus of this invention.

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

  In this specification, the relationship between the optical axes includes errors allowed in the technical field to which the present invention belongs. Specifically, “parallel” and “orthogonal” mean that the angle is within a strict angle of less than ± 10 °, preferably less than ± 5 °, and less than ± 3 °. More preferred. Further, “vertical alignment” means that it is within a range of less than ± 20 ° from a strict vertical angle, preferably less than ± 15 °, and more preferably less than ± 10 °. . Further, the “slow axis” means a direction in which the refractive index is maximized. Further, the measurement wavelength of the refractive index is a value at λ = 550 nm in the visible light region unless otherwise specified.

  In this specification, Re (λ) and Rth (λ) represent in-plane retardation and retardation in the thickness direction at the wavelength λ, respectively. Re (λ) is measured with KOBRA 21ADH or WR (manufactured by Oji Scientific Instruments Co., Ltd.) by making light having a wavelength of λ nm incident in the normal direction of the film. In selecting the measurement wavelength λnm, the wavelength selection filter can be exchanged manually, or the measurement value can be converted by a program or the like. When the film to be measured is represented by a uniaxial or biaxial refractive index ellipsoid, Rth (λ) is calculated by the following method. Rth (λ) is the film surface when Re (λ) is used and the in-plane slow axis (determined by KOBRA 21ADH or WR) is the tilt axis (rotation axis) (if there is no slow axis) Measure the light at a wavelength of λnm from each tilted direction in steps of 10 degrees from the normal direction to 50 ° on one side with respect to the film normal direction. KOBRA 21ADH or WR is calculated based on the measured retardation value, the assumed value of the average refractive index, and the input film thickness value. In the above case, in the case of a film having a direction in which the retardation value is zero at a certain tilt angle with the in-plane slow axis from the normal direction as the rotation axis, retardation at a tilt angle larger than the tilt angle. The value is calculated by KOBRA 21ADH or WR after changing its sign to negative. The retardation value is measured from two inclined directions with the slow axis as the tilt axis (rotation axis) (if there is no slow axis, the arbitrary direction in the film plane is the rotation axis). Rth can also be calculated from the following formula (A) and formula (III) based on the value, the assumed value of the average refractive index, and the input film thickness value.

・ ・ ・ ・ ・ ・ Formula (A)
Note that Re (θ) represents a retardation value in a direction inclined by an angle θ from the normal direction. In the formula (A), nx represents the refractive index in the slow axis direction in the plane, ny represents the refractive index in the direction orthogonal to nx in the plane, and nz is the direction orthogonal to nx and ny. Represents the refractive index.
Rth = ((nx + ny) / 2−nz) × d (formula (III))

  When the film to be measured is a film that cannot be expressed by a uniaxial or biaxial refractive index ellipsoid, that is, a film without a so-called optical axis, Rth (λ) is calculated by the following method. Rth (λ) is from −50 ° to the normal direction of the film, with Re (λ) being the in-plane slow axis (determined by KOBRA 21ADH or WR) as the tilt axis (rotary axis). Measured at 11 points by making light of wavelength λ nm incident in 10 ° steps up to + 50 °, and based on the measured retardation value, average refractive index assumption value and input film thickness value. KOBRA 21ADH or WR is calculated. In the above measurement, as the assumed value of the average refractive index, values in the polymer handbook (John Wiley & Sons, Inc.) and catalogs of various optical films can be used. If the average refractive index is not known, it can be measured with an Abbe refractometer. The average refractive index values of main optical films are exemplified below: cellulose acylate (1.48), cycloolefin polymer (1.52), polycarbonate (1.59), polymethyl methacrylate (1.49), Polystyrene (1.59). The KOBRA 21ADH or WR calculates nx, ny, and nz by inputting the assumed value of the average refractive index and the film thickness. Nz = (nx−nz) / (nx−ny) is further calculated from the calculated nx, ny, and nz.

  Unless otherwise specified, the measurement wavelengths of Re and Rth are values at λ = 550 nm in the visible light region.

  The present invention relates to an image display device, an image display device having a first polarizing plate and a translucent protective substrate, arranged in front of the viewing side of the image display portion. The present invention relates to a technique for achieving compatibility with 3D image display performance. In the present invention, an antireflection layer is disposed between the image display unit and the translucent protective substrate or on the further visible side of the translucent protective substrate to effectively achieve antireflection performance, The antireflection layer is generally incorporated into an image display device together with a support such as a polymer film, and the optical properties of the polymer film are suitable for 3D image display performance, particularly for the occurrence of crosstalk between the left and right images or a decrease in luminance. Focusing on the influence, by adjusting Rth and Re of all the members arranged in front of the polarizing film on the viewing side of the first polarizing plate within a predetermined range, good 3D image display performance is achieved. Yes.

Hereinafter, the present invention will be described with reference to the drawings. However, the drawings are schematic views, and the relative relationship between the thicknesses of the respective layers does not reflect the actual relationship.
FIG. 1 shows a schematic cross-sectional view of an example of the image display device of the present invention. An image display device 1 shown in FIG. 1 includes an image display unit 10 composed of a liquid crystal panel, an organic EL panel, and the like, and a first polarizing plate 11 and a translucent protective substrate 12 such as a glass plate or a plastic substrate in front of the viewing side. And have. The image display device 1 can display a 3D image, and when displaying a 3D image, an observer visually recognizes the image from the translucent protective substrate 12 side using polarized glasses 2 formed of a polarizing film. To do. For example, in the aspect in which the left-eye and right-eye images from the image display unit 10 are linearly polarized images having mutually orthogonal polarization axes, the polarizing glasses 2 made of linearly polarizing films having mutually orthogonal absorption axes are used. Further, the image display device 1 may be capable of displaying a normal two-dimensional image (2D), and the observer observes the image without the polarizing glasses 2 during the 2D display.
In addition, the 1st polarizing plate 11 may be utilized in order that the image display part 10 may form an image, and the image display part 10 has a polarizing film separately from a 1st polarizing plate. Also good. In the latter mode, that is, the mode in which the image display unit 10 has a linear polarizing film on the display surface separately from the first polarizing film, the absorption axis of the polarizing film and the absorption axis of the first polarizing film are matched. Deploy.

  The space 14 between the image display unit 10 and the translucent protective substrate 12 may be a gap, or, as disclosed in Patent Document 1, is filled with a curable resin composition and cured. It is also possible to use a filled resin layer.

  In the image display device 1, antireflection plates 16 are arranged on both the viewing side surface of the image display unit 10 and the surface of the translucent protective substrate 12. The translucent protective substrate 12 is intended for aesthetics and the like, and generally, a member with high surface smoothness such as a glass plate is used. If the substrate having such characteristics is arranged on the viewing side, light may be reflected on the front surface and the back surface of the substrate 12 and external light may be reflected, which may cause a decrease in image visibility. In the image display device 1, the reflection of external light is suppressed by arranging a plurality of antireflection plates 16.

The optical characteristics of the member disposed in front of the viewing side of the polarizing film of the first polarizing plate 11 may cause crosstalk between the left and right images during 3D image display, or cause a decrease in luminance. Similarly, the optical characteristics of the antireflection plate 16 may cause crosstalk between the left and right images when displaying a 3D image, or may cause a decrease in luminance. In particular, as shown in FIG. 2, the antireflection plate 16 is generally a laminate having an antireflection layer 16a formed by coating or the like and a support 16b that supports the antireflection layer 16a. A polymer film that is widely used as a support has a certain amount of phase difference, which affects the occurrence of crosstalk between left and right images during 3D image display, or the reduction in luminance. Further, since the first polarizing plate 11 is also generally a laminate in which a protective film is laminated in front of the linear polarizing film on the viewing side, the protective film has a certain phase difference, and The phase difference also affects the occurrence of crosstalk between left and right images or a decrease in luminance. In the image display device 1, a member disposed in front of the viewing side of the polarizing film of the first polarizing plate 11, that is, the viewing side protective film of the first polarizing plate 11, the three antireflection plates 16, and the translucency. Since the absolute value of the sum of Rth of the protective substrate 12 is 20 nm or less and the absolute value of the sum of Re is 10 nm or less, the occurrence of crosstalk between the left and right images during 3D image display, or a decrease in luminance. It is suppressed.
In addition, about the translucent protective substrate 12, generally, a glass plate is used, and its Rth and Re are small enough to be ignored. Therefore, in the image display device 1, the absolute value of the sum of Rth of the viewing-side protective film of the first polarizing plate 11 and the three antireflection plates 16 is 20 nm or less, and the absolute value of the sum of Re is 10 nm or less. It is preferable that

  When the antireflection plate having the laminated structure shown in FIG. 2 is used, the retardation of the polymer film used as the support 16b may be greatly affected. The absolute value of Rth of the polymer film used as the support 16b is preferably 20 nm or less, and more preferably 10 nm or less. Further, the absolute value of Re is preferably 10 nm or less, and more preferably 5 nm or less. Moreover, also when the 1st polarizing plate has a protective film in the visual recognition side front, the said range is preferable also about the absolute value of Rth and Re of the said protective film. Further, the support 16b of the antireflection plate 16 may function as a protective film when the first polarizing plate 11 has a protective film for a polarizing film. In that case, it is preferable to arrange the polymer film to be the support 16b on the image display unit 10 side.

  In the image display device 1, since a plurality of antireflection plates 16 are arranged, when the antireflection plate having the laminated structure shown in FIG. 2 is used, the support 16b is a polymer film in which the sign of Rth is opposite to each other. It is preferable to use an antireflection plate having a thickness of Rth because Rth can be canceled out. Even when the Rths cancel each other, an excessively high Rth member is arranged to cause a deterioration in image display characteristics. Therefore, in this aspect as well, the Rth of the polymer film used as the support 16b is reduced. The absolute value of is preferably 90 nm or less, more preferably 45 nm or less.

  In order to obtain an effect of reducing reflection of external light by the antireflection plate 16, the total reflectance is preferably 7.5% or less, more preferably 5.0% or less, and 2.0 More preferably, it is% or less. Ideally 0%. 1 shows a configuration in which three antireflection plates are arranged. However, if sufficient light reflection performance is obtained, one or two antireflection plates may be used, and four or more antireflection plates may be used. A plate may be arranged. 2 shows a structure in which the antireflection layer 16a is a single layer, the antireflection layer 16a may be composed of a plurality of layers. Examples of the antireflection plate that can be used in the present invention will be described later.

  The configuration of the image display unit 10 is not particularly limited. For example, it may be a liquid crystal panel including a liquid crystal layer or an organic EL display panel including an organic EL layer. In any aspect, various possible configurations can be employed. In an aspect in which the image display unit 10 is a liquid crystal panel, the image display unit 10 generally includes a pair of polarizing films and a liquid crystal cell disposed therebetween.

FIG. 3 shows a schematic cross-sectional view of another example of the image display device of the present invention. The same members as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
An image display device 1 'shown in FIG. 3 includes an image display unit 10 made of a liquid crystal panel or the like, and a first polarizing plate 11 and a translucent protective substrate 12 such as a glass plate or a plastic substrate in front of the viewing side. Have. The image display device 1 ′ can display a 3D image, and when displaying a 3D image, the observer can make a circle composed of a linearly polarizing film 2 and a λ / 4 layer 3 and circularly polarizing films opposite to each other. An image is visually recognized from the translucent protective substrate 12 side using polarized glasses. The left-eye and right-eye images from the image display unit 10 are circularly polarized images in opposite directions, and can be visually recognized as a three-dimensional image by observing through circularly polarized glasses. Further, the image display device 1 ′ may be capable of displaying a normal two-dimensional image (2D), and the observer observes the image without the circularly polarized glasses 2 during the 2D display.

In the image display device 1 ′, a λ / 4 plate 20 is disposed on the viewing side surface of the image display unit 10 in order to display a circularly polarized image. As with the image display device 1, three antireflection plates 16 are arranged, and are arranged on both the viewing side surface of the λ / 4 plate 20 and the surface of the translucent protective substrate 12, respectively. The reflection is suppressed. Moreover, also about the image display apparatus 1 'of this invention, the member arrange | positioned in the visual recognition side front of the polarizing film of the 1st polarizing plate 11, ie, the visual recognition side protective film of the 1st polarizing plate 1, (lambda) / 4. The absolute value of the sum of Rth of the plate 20, the three antireflection plates 16 and the translucent protective substrate 12 is 20 nm or less, and the three antireflection plates 16 and the translucent protective substrate excluding the λ / 4 plate 20 The absolute value of the sum of 12 Re is 10 nm or less, and the occurrence of crosstalk between the left and right images during 3D image display or the reduction in luminance are suppressed.
In addition, about the translucent protective substrate 12, generally, a glass plate is used, and its Rth and Re are small enough to be ignored. Therefore, in the image display device 1 ′, the absolute value of the sum of Rth of the λ / 4 plate 20 and the three antireflection plates 16 is 20 nm or less, and the absolute value of the sum of Re of the three antireflection plates 16 is 10 nm. The following is preferred.

  There is no particular limitation on the structure of the λ / 4 plate 20. An example is a λ / 4 plate having a laminated structure shown in FIG. 4, and λ / 4 having a retardation layer 20a made of a composition containing a liquid crystal compound formed by coating and the like, and a support 20b that supports the retardation layer 20a. It is a board. An alignment film for controlling the alignment of the liquid crystal compound may be disposed between the retardation layer 20a and the support 20b when the retardation layer is formed. The retardation layer 20a may exhibit sufficient optical characteristics as a λ / 4 plate (that is, Re is about 120 to 150 nm) alone, or as a λ / 4 plate as a whole laminate with the support 20b. It may exhibit sufficient optical properties. Another example of a λ / 4 plate that can be used is an optically uniaxial or biaxial retardation film. One retardation film may exhibit sufficient optical properties as a λ / 4 plate (that is, Re is about 120 to 150 nm), or as a laminate of two or more, it is sufficient as a λ / 4 plate. It may show optical properties. In the image display device 1 ′, the Re of the λ / 4 plate 20 is necessary for obtaining a circularly polarized image. Therefore, in the image display device 1 ′, the three antireflection plates 16 excluding the λ / 4 plate 20 are used. The absolute value of the sum of Re of the other members needs to be 10 nm or less.

  On the other hand, the Rth of the λ / 4 plate 20 affects the occurrence of crosstalk between circularly polarized left and right images or the luminance reduction. Therefore, the viewing side of the polarizing film of the first polarizing plate 11 including the λ / 4 plate 20 The absolute value of the sum of Rth of all members arranged in front is required to be 20 nm or less. When the λ / 4 plate having the laminated structure shown in FIG. 4 is used, the Rth of the polymer film used as the support 20b may be greatly affected. In an embodiment in which the λ / 4 plate 20 has a polymer film as a support or is composed of a retardation film, the Rth of the polymer film or retardation film used is preferably 90 nm or less, preferably 45 nm or less. Is more preferable. When the λ / 4 plate 20 has a polymer film as a support, the polymer film may be used as a protective film for the polarizing film of the first polarizing plate.

  When an observer observes a 3D image, the observer observes the image using circularly polarized glasses made of a circularly polarizing film composed of a linearly polarizing film and a λ / 4 layer and opposite to each other. However, even if the observer tilts the face, the linearly polarizing film and the λ / 4 layer of the circularly polarized glasses move along with the face, so that the linearly polarizing film and λ / are arranged on the viewing side of the 3D image display device. The polarized light after passing through the four layers is always incident perpendicular to the plane of the linearly polarizing film and the λ / 4 layer of the circularly polarized glasses. Therefore, it is considered that Rth does not substantially contribute to crosstalk because Rth of the λ / 4 layer of the circularly polarized glasses does not substantially affect the polarization.

  Further, in the image display device 1 ′, since the plurality of antireflection plates 16 are disposed together with the λ / 4 plate 20, the λ / 4 plate 20 has a polymer film as a support or is made of a retardation film. Then, as the film, it is preferable to use a film in which the Rth of the polymer film included in the antireflection plate 16 is opposite to each other because Rth can be offset each other. Even when the Rths cancel each other, the excessively high Rth members are arranged to cause deterioration in image display characteristics. Therefore, in this embodiment, the λ / 4 plate 20 is also included as a support. The retardation film used as the polymer film or the λ / 4 plate 20 preferably has an absolute value of Rth of 90 nm or less, and more preferably 45 nm or less.

  Although FIG. 3 shows a configuration in which the λ / 4 plate 20 is disposed on the surface of the image display unit 10, the λ / 4 plate may be disposed anywhere as long as it is closer to the viewing side than the first polarizing plate 11. . The angle formed by the slow axis of the λ / 4 plate 20 and the absorption axis of the polarizing film of the first polarizing plate 11 is preferably 45 ° or 135 °. The λ / 4 plate 20 may also be used as a protective film for the polarizing film of the first polarizing plate. When the λ / 4 plate having the laminated structure shown in FIG. 4 is also used as a protective film for the polarizing film, it is preferable to dispose the polymer film as the support 20b on the polarizing film side.

Details of various members that can be used in the image display apparatus of the present invention will be described below.
Antireflection layer:
The image display device of the present invention has at least one antireflection layer. The antireflection layer has an action of reflecting light on the front surface and / or back surface of the translucent protective substrate and suppressing reflection of external light.

  In the present specification, as described below, the “antireflection layer” includes not only a laminate of a plurality of layers having different refractive indexes formed on a support, but also such a laminate. In addition to the structure of the body, a resin layer formed by filling a resin or the like between two or more reflecting surfaces is also included for the purpose of achieving antireflection by reducing the number of optical interfaces. Shall.

  In the present invention, one or more antireflection layers are disposed. The type of antireflection layer and the number of antireflection layers to be used are not particularly limited as long as they are sufficient to suppress external light from being reflected on the translucent protective substrate. The light reflectance is one measure, and in the present invention, the sum of the light reflectances of the antireflection layer is preferably 7.5% or less, more preferably 5.0% or less. More preferably, it is 0% or less. Ideally 0%.

  In order to achieve antireflection performance, the antireflection layer is preferably composed of a low refractive index layer or includes a low refractive index layer. The refractive index of the low refractive index layer is preferably 1.30 to 1.46, more preferably 1.30 to 1.44. Examples of materials that can be used for the formation of the low refractive index layer include fluorine resins, hydrolyzate condensates of fluorine-containing organosilane materials described in JP 2010-237623 A, [0063] to [0075]. Fine particles (in particular, inorganic fine particles having a hollow structure are preferable) and the like. More specifically, the resins described in JP 2004-345278 A, JP 2010-237623 A, and the like are included.

  In order to achieve higher antireflection performance, it is preferable to use a laminate of a low refractive index layer and a high refractive index layer and a laminate of a low refractive index layer, a middle refractive index layer and a high refractive index layer. Details of the antireflection layer having a laminated structure are described in, for example, JP-A-2006-17870, and can be referred to.

  In order to further improve the antireflective properties of the low refractive index layer, it is also preferable to add fine particles to the low refractive index layer. Fine particles may be added to the low refractive index layer included in the laminate. Usable fine particles include both inorganic fine particles and organic fine particles. Inorganic fine particles are more preferable. The average particle size of usable fine particles is about 10 to 200 nm. It is also preferable to use fine particles having a porous or hollow structure, particularly silica fine particles having a hollow structure (preferably hollow silica fine particles. For details of usable fine particles and a low refractive index layer containing fine particles, There are descriptions in Japanese Patent Laid-Open Nos. 2010-237623 and 2006-17870, and can be referred to.

  In general, the thickness of the low refractive index layer used for the antireflection layer is about 0.05 to 10 μm, and Re and Rth are about −2 to 2 nm and −2 to 2 nm. Further, the thickness of the high refractive index layer and the middle refractive index layer used for the antireflection layer having the above laminated structure is about 0.03 to 0.2 μm, and Re and Rth are about −2 to 2 nm and −2 to 2 nm. It is. That is, the Rth and Re of the antireflection layer itself hardly affect the crosstalk of the left and right images, and it is considered that the Rth and Re of the polymer film used as a support described below have an effect.

Support for antireflection layer:
The antireflection layer is formed by coating or vacuum deposition, and generally requires a support for supporting it. In the present invention, it is necessary to adjust the Rth and Re of the support used to support the antireflection layer and incorporated in the display device together with the antireflection layer.

  One embodiment of the present invention is an embodiment in which all of the support of the antireflection layer is a low Rth and low Re polymer film. If an antireflection layer having a low Rth and low Re polymer film as a support is used, even if a plurality (for example, three as shown in FIGS. 1 and 3) are arranged to obtain sufficient antireflection performance, the first The absolute value of the sum of Rth of all the members arranged in front of the viewing side of the polarizing film of the polarizing plate can be 20 nm or less, and the absolute value of the sum of Re can be 10 nm or less. In this embodiment, a polymer having an absolute value of Rth of 20 nm or less (more preferably 10 nm or less, ideally 0 nm) and an absolute value of Re of 10 nm or less (more preferably 5 nm or less, ideally 0 nm) The film is preferably used as a support for the antireflection layer.

  Another aspect of the present invention is an aspect in which a plurality of antireflection layers are arranged, and the support of the antireflection layer uses a polymer film that exhibits Rths having positive and negative signs different from each other. Low Rth and low Re polymer films are limited in production methods and materials and may be difficult to obtain. This embodiment enables use of a general-purpose polymer film as a support, and is preferable from the viewpoint of cost. For example, in an embodiment in which two antireflection layers are arranged, one antireflection layer has a polymer film showing positive Rth as a support, and the other antireflection layer has a polymer film showing negative Rth as a support. It is preferable because the Rths cancel each other out. However, if a polymer film exhibiting an excessively high Rth is disposed, even if the absolute value of the Rth sum of the entire member is 20 nm or less, there is a case where the crosstalk is affected to some extent. Therefore, also in this embodiment, the Rth of the polymer film used as the support is preferably not too high, and the absolute value of Rth is preferably 0 to 90 nm, and more preferably 0 to 45 nm. On the other hand, in this embodiment, Re of the polymer film used as the support is preferably low as in the above embodiment, and the absolute value of Re is preferably 10 nm or less, more preferably 5 nm or less, Ideally it is 0 nm.

  The above two modes may be combined. That is, as shown in FIGS. 1 and 3, when three antireflection layers are arranged, the first antireflection layer has a polymer film exhibiting positive Rth and low Re, and the second antireflection layer. The anti-reflection layer has a polymer film exhibiting negative Rth and low Re, and the Rth is offset by the support of the first and second anti-reflection layers. Further, as the third antireflection layer, a layer having a low Rth and low Re polymer film as a support is disposed. In this embodiment, there are no particular restrictions on the positions of the first to third antireflection layers, and each of them is between the polarizing film of the first polarizing plate and the protective substrate, or the translucent protection. The same effect can be obtained regardless of the position of the substrate further in front of the viewing side.

  There is no restriction | limiting in particular about the component of the polymer film used as a support body (it means the component polymer with the highest compounding ratio among components). Examples of polymer films that can be used include cellulose acylate films (for example, cellulose triacetate film (refractive index 1.48), cellulose diacetate film, cellulose acetate butyrate film, cellulose acetate propionate film), polyethylene terephthalate film , Polyethersulfone film, polyacrylic resin film, polyurethane resin film, polyester film, polycarbonate film, polysulfone film, polyether film, polymethylpentene film, polyetherketone film, (meth) acrylonitrile film polyolefin, alicyclic A polymer having a formula structure (norbornene resin (Arton: trade name, manufactured by JSR Corporation, amorphous polyolefin (Zeo X: product name, manufactured by Nippon Zeon Co., Ltd.), polypropylene, etc. Among these, a polymer film containing cellulose acylate, acrylic polymer, or cyclic olefin polymer as a main component is preferable. Commercial products may be used.

  The thickness of the polymer film used as the support is usually about 25 μm to 1000 μm, preferably 25 μm to 250 μm, and more preferably 30 μm to 90 μm.

  The polymer film used as the support may be produced by either a solution casting method or a melt casting method. Moreover, in order to make Rth and Re into desired ranges, a stretching process and / or a shrinking process may be performed after the film formation. About the manufacturing method etc. of the polymer film which shows positive Rth, it describes in Unexamined-Japanese-Patent No. 2004-322535 etc. Moreover, about the manufacturing method etc. of the polymer film which shows negative Rth, it describes in Unexamined-Japanese-Patent No. 2010-66752 etc. There is a reference.

λ / 4 layer:
In an aspect in which the image display device of the present invention displays circularly polarized left and right images during 3D image display, it is provided between the polarizing film of the first polarizing plate and the protective substrate, or further of the protective substrate. A λ / 4 layer is arranged in front of the viewing side. In the present invention, since the absolute value of the sum of Rth of all the members arranged on the viewing side front side of the polarizing film of the first polarizing plate needs to be 20 nm or less, the λ / 4 layer is arranged. In the aspect, it is necessary to adjust the Rth of the λ / 4 layer in relation to the Rth of other members. On the other hand, the Re of the λ / 4 layer is based on the premise that λ / 4, that is, Re is about 120 to 150 nm in order to display circularly polarized left and right images. Therefore, in the aspect in which the λ / 4 layer is disposed, Re is not the absolute value of the sum of Re of all the members disposed on the viewing side front side of the polarizing film of the first polarizing plate. The absolute value of the sum of Re of all other members excluding the / 4 layer is 10 nm or less.

  There are no particular restrictions on the λ / 4 layer used in the present invention. The retardation layer formed by fixing the alignment state of the liquid crystal composition may be used, or may be composed of a retardation polymer film.

  In the aspect in which the λ / 4 layer is a retardation layer in which the alignment state of the liquid crystal compound is fixed, examples of the liquid crystal compound to be used include both a disk-like liquid crystal compound and a rod-like liquid crystal compound. In order to achieve the optical characteristics of the λ / 4 layer by using the discotic liquid crystal compound, the vertical orientation state of the discotic liquid crystal compound (that is, the disc surface of the discotic molecule is oriented perpendicular to the layer surface). In order to achieve the optical characteristics of the λ / 4 layer by using the rod-shaped liquid crystal compound, the horizontal alignment state of the rod-shaped liquid crystal compound (that is, the major axis of the rod-shaped molecule is relative to the layer surface). It is preferable to fix the state of being oriented parallel to each other. Examples of usable disc-shaped liquid crystals and rod-shaped liquid crystals are described in various documents, and any of them can be referred to. In particular, it is preferable to use the discotic liquid crystal compound described in JP-A-2006-76992 and the rod-shaped liquid crystal compound described in JP-A-2002-09883.

The liquid crystal composition is preferably curable. In order to be curable, the liquid crystal compound itself or the additive is preferably a compound having a polymerizable group. Further, it preferably contains a polymerization initiator such as a photopolymerization initiator. Furthermore, it may contain one or more additives such as an alignment control agent for stably forming the alignment state, a repellency inhibitor for improving coating properties, and a plasticizer. The λ / 4 layer can be formed by the following method, for example. A liquid crystal composition is prepared as a coating liquid, and the coating liquid is applied to the support or the surface of the alignment film formed on the support, and dried under heating as desired to obtain a desired alignment state. Then, it forms by providing light, such as an ultraviolet-ray, advancing a polymerization reaction, making it harden | cure, and fixing an orientation state. In order to stably obtain a desired alignment state, it is preferable to use an alignment film.
Details of usable additives, alignment films, and formation methods are described in Japanese Patent Application Laid-Open No. 2006-76992, and can be referred to.

  In an embodiment in which the λ / 4 layer is a retardation layer in which the alignment state of the liquid crystal composition is fixed, as shown in FIG. 4, the λ / 4 layer has a polymer film that supports the λ / 4 layer, and an image together with the polymer film. In general, it is incorporated into a display device. Therefore, in the embodiment in which the λ / 4 layer has a support, the preferred ranges of Rth and Re exhibited by the polymer film used for the support are the same as those of the polymer film used as the support for the antireflection layer. The examples of the preferred main component polymer of the polymer film are the same as described above, and the preferred examples are also the same.

In the example in which the λ / 4 layer is a retardation layer in which the vertical alignment state of the discotic liquid crystal compound is fixed, the retardation layer has Re of about λ / 4 and Rth is negative. There is a tendency to exhibit optical properties. Specifically, the retardation layer has Re of about 120 to 150 nm and Rth of about −40 to −80 nm. When a polymer film having a positive Rth and a low Re, such as a cellulose acylate film, is used as the support, the mutual Rth can be offset to some extent by the λ / 4 layer and the support.
On the other hand, in the example in which the λ / 4 layer is a retardation layer formed by fixing the horizontal alignment state of the rod-like liquid crystal compound, the retardation layer has an optical characteristic in which Re is approximately λ / 4 and Rth is positive. There is a tendency to exhibit characteristics. Specifically, the retardation layer has Re of about 120 to 150 nm and Rth of about 60 to 80 nm. Therefore, when a Rth is negative and a low Re polymer film described in JP 2010-66752 A is used as a support, the Rth is offset to some extent by the λ / 4 layer and the support. can do.

  In the embodiment in which the λ / 4 layer is composed of a retardation polymer film, the retardation polymer film may be a single sheet or a laminate of two or more sheets. In the former example, a retardation film that exhibits optical characteristics required for the λ / 4 layer alone, that is, sufficient optical characteristics as a λ / 4 plate (that is, Re is about 120 to 150 nm) may be used. Further, as a whole laminate of two or more retardation films, a laminate showing sufficient optical characteristics as a λ / 4 plate may be used. Examples of the main component polymer of the retardation film are the same as those of the main component polymer of the polymer film used as the support for the antireflection layer, and preferred examples are also the same.

  Examples of the retardation film functioning as a λ / 4 layer include an optically uniaxial film and an optically biaxially stretched film. The stretched film functioning as the λ / 4 layer is described in JP2010-204224A and JP2007-286615A, and any of them can be used in the present invention.

  Examples of the stretched film that can be used as the λ / 4 layer include a film having Re of λ / 4, that is, about 120 to 150 nm and Rth of 60 to 80 nm, and Re of λ / 4, that is, about 120 to 150 nm. And a film having an Rth of 100 to 180 nm. In any aspect, Rth may exceed 20 nm only in the λ / 4 layer. For example, the support for an antireflection layer or the like may have an Rth with an opposite polarity to cancel Rth of the λ / 4 layer. It is preferable to use a polymer film showing

First polarizing film and protective film thereof:
There is no restriction | limiting in particular about the polarizing film which can be utilized as a 1st polarizing film in this invention. A general absorption-type polarizer 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 be used. The iodine-based polarizing film and the dye-based polarizing film are generally produced by adsorbing iodine or dichroic dye to polyvinyl alcohol (PVA) and stretching. The same applies to the second polarizing film used in the 3D image display system of the present invention.

  The polarizing film is generally used as a polarizing plate having a laminate structure having protective films on both sides thereof. Along with the polarizing film, the protective film disposed on the viewing side affects the effect of the present invention. Therefore, in relation to Re and Rth of other members disposed on the viewing side forward from the first polarizing film, Need to be prepared. A low Re and low Rth film may be used, or a film exhibiting optical characteristics that offsets Re and Rth of a film used as a support for the antireflection layer may be used. About a specific example, it is the same as that of the support body film of said antireflection layer. In an embodiment using a PVA polarizing film, a cellulose acylate film is preferable because of good adhesion.

Image display:
The image display unit of the image display device of the present invention includes a liquid crystal panel of a liquid crystal display device (LCD), a plasma display panel (PDP), an electroluminescence display (ELD) panel, a cathode ray tube display device (CRT), a surface electric field display ( Various image display panels such as SED) panels can be used. Particularly preferred is a liquid crystal panel of a liquid crystal display device (LCD). The mode of the liquid crystal panel is not particularly limited, and the effects of the present invention can be obtained. Various modes such as twisted nematic (TN), super twisted nematic (STN), vertical alignment (VA), in-plane switching (IPS), optically compensated bend cell (OCB), transmission type, reflection type, Alternatively, a transflective liquid crystal panel can be used.

  In an aspect in which a liquid crystal panel is used as the image display unit, an example of the image display unit includes at least a liquid crystal cell and a pair of polarizing films disposed above and below the liquid crystal cell. Between the liquid crystal cell and both or one of the pair of polarizing films, a polymer film such as an optical compensation film or a protective film for the polarizing film may be disposed. Moreover, the polymer film etc. which function as a protective film of a polarizing film may be arrange | positioned in the further outer side of each of a pair of polarizing film. Further, as described above, the support of the antireflection layer, the support of λ / 4 layer, or the λ / 4 layer itself may be disposed on the viewing side surface of the image display unit as a protective film of the polarizing film. .

Protection part:
The protection unit included in the image display device of the present invention is translucent. Here, “translucency” means
It means that it absorbs almost no visible light. The protective part is formed of a plate-like, sheet-like, or film-like translucent member having the same size as the image display part. Examples of the translucent member that can be used as the protective part include optical glass and plastic (acrylic resin such as polymethyl methacrylate). An antireflection film, a light shielding film, a viewing angle control film, or the like may be disposed on the front surface or the back surface of the protective portion.

  In the image display device of the present invention, there may be a gap between the image display unit and the protection unit. Alternatively, the void may be filled with a curable resin composition and cured to form a filled layer. Examples of the filling layer using a material obtained by curing the curable resin composition include a layer made of a cured product of a photocurable resin composition containing a polymer and an acrylate monomer. Examples of the polymer having a polymerizable group that can be used for forming the packed layer include polyurethane acrylate, polyisoprene acrylate or an ester compound thereof, terpene hydrogenated resin, butadiene polymer, and the like. Examples of the monomer having a polymerizable group that can be used for forming the packed layer include isobornyl acrylate, dicyclopentenyloxyethyl methacrylate, 2-hydroxybutyl methacrylate, and the like.

  The curable composition preferably contains a polymerization initiator. Examples of usable polymerization initiators include photopolymerization initiators such as 1-hydroxy-cyclohexyl-phenyl-ketone. However, it is not limited to these examples, It can select according to the kind of polymer and monomer which have a polymeric group used. A thermal polymerization initiator may be used.

The filling layer fills the gap between the optical film disposed on the image display portion and the protective portion with the curable composition, and cures under irradiation with light such as ultraviolet rays and / or under heating. It can be formed by proceeding and curing.
Although there is no restriction | limiting in particular about the thickness of the filling layer formed, The thickness of the filling layer formed will be about 50-1000 micrometers. However, it is not limited to this range.

  The refractive index of the filling layer is not particularly limited, but if the refractive index difference Δn between the filling layer and the protective part (generally a glass substrate and the refractive index is about 1.5) is too large, Since problems, such as a display quality fall by interface reflection, arise, it is preferable that it is 1.45-1.55, and it is more preferable that it is 1.47-1.53. Such a filling layer has the effect of reducing the number of optical interfaces, and is included in the example of the antireflection layer. Rth of the filling layer is ± 2 nm or less, and Re is ± 2 nm or less. Further, when the gap between the image display part and the protection part is a gap, Rth and Re of the gap are zero.

Image display device and 3D image display system:
The image display device of the present invention can be used as an image display device for various uses such as a television display device, a monitor, a signage, a touch panel display device, a personal computer display device, and a mobile phone display device. In particular, having a protective part is excellent in aesthetics, so it is suitable for applications such as video viewing.

  In addition, the present invention provides a 3D having at least the image display device of the present invention and an outer polarizing film (second polarizing film) for transmitting a video displayed on the image display device so that the image is visually recognized as a 3D image. It also relates to an image display system. When the image display device displays a 3D image, the observer visually recognizes the image from the translucent protective substrate side using polarized glasses. For example, in an aspect in which the left-eye and right-eye images from the image display unit are linearly polarized images having mutually orthogonal polarization axes, linearly polarized glasses that are orthogonal to each other are used. In addition, for example, in a mode in which the left-eye and right-eye images from the image display unit are circularly polarized images that are opposite to each other, circularly polarized glasses that are opposite to each other are used. In this aspect, the image display device has the λ / 4 layer in front of the viewing side of the image display unit, and also stacks the λ / 4 layer on the outer polarizing film disposed outside. The slow axis of the λ / 4 layer disposed inside the image display device and the slow axis of the λ / 4 layer laminated on the polarizing film disposed outside the image display device should be arranged orthogonal to each other. preferable. Also, in an aspect in which the image display unit is a liquid crystal panel, in order to display circularly polarized left and right images, the absorption axis of the polarizing film disposed inside the image display unit and on the viewing side, and the image display unit The slow axis of the λ / 4 layer disposed in front of the viewing side is preferably 45 ° or 135 °.

  The present invention will be described more specifically with reference to the following examples. The materials, reagents, amounts and ratios of substances, operations, and the like shown in the following examples can be appropriately changed without departing from the gist of the present invention. Therefore, the scope of the present invention is not limited to the following specific examples.

1. Preparation of polymer film for support (1) Film 1
A commercially available triacetyl cellulose film “Z-TAC” (manufactured by FUJIFILM Corporation) was prepared and used as film 1. This film had Re of 0 nm and Rth of −6 nm.
(2) Film 2
A commercially available triacetyl cellulose film “Fujitac TD80UL” (manufactured by Fuji Film Co., Ltd.) was prepared and used as film 2. This film had Re of 0 nm and Rth of 40 nm.

(3) Film 3
(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. A mixture of sulfuric acid as a catalyst (7.8 parts by mass with respect to 100 parts by mass of cellulose) and carboxylic anhydride was added to cellulose derived from pulp after cooling to -20 ° C, 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 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 carried out with the high speed stirring shaft stopped and the peripheral speed of the stirring shaft having anchor blades set at 0.5 m / sec.
5) Filtration The cellulose acylate solution obtained above was filtered with a filter paper (# 63, manufactured by Toyo Roshi Kaisha, Ltd.) having an absolute filtration accuracy of 0.01 mm, and further a filter paper (FH025, Poll) having 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 (film thickness: 41 μm).
This cellulose acylate film was used as film 3. This film had Re of 0 nm and Rth of −40 nm.
Here, as Re and Rth, values measured at a wavelength of 550 nm using an automatic birefringence meter KOBRA-21ADH (manufactured by Oji Scientific Instruments) were used.

(4) Film 4
A film was obtained in the same manner as the film 4 except that the film thickness was 20 μm in the production of the film 3. This film had Re of 0 nm and Rth of −20 nm.

(5) Film 5
A film was obtained in the same manner except that the film thickness was 80 μm in the production of film 3, and used as film 5. This film had Re of 0 nm and Rth of -80 nm.

(6) Film 6
90 parts by weight of polymethyl methacrylate resin (Mitsubishi Rayon Co., Ltd., Acrypet VH, photoelastic coefficient 5 × 10 ⁻¹² m ² / N) and 10 ^{% by} weight of acrylonitrile-styrene copolymer (Asahi Kasei Co., Ltd., Stylac AS) The film was melted and extruded from a T-die, formed into a film on a cast roll, and then stretched by a zone stretching method and a tenter stretching method to obtain predetermined optical characteristics.
The acrylic film thus produced was used as the film 6. This film had Re of 0 nm and Rth of 0 nm.

(7) Film 7
The surface of a commercially available norbornene-based polymer film “ZEONOR ZF14-060” (manufactured by Optes Co., Ltd.) was subjected to corona discharge treatment using a solid state corona treatment machine 6KVA (manufactured by Pillar Co., Ltd.). The thickness of this film was 60 μm.
The film thus produced was used as film 7. This film had Re of 0 nm and Rth of 5 nm.

(7) Film 8
The cellulose acylate solution A was prepared by mixing each component at the ratio described below.
Cellulose acylate having an acetyl group substitution degree of 2.80 100 parts by mass Compound F-1 5 parts by mass Triphenyl phosphate 7 parts by mass Diphenyl phosphate 4 parts by mass Methylene chloride 418 parts by mass Methanol 62 parts by mass

The cellulose acylate solution A-1 was co-cast using a band casting machine, the obtained web was peeled from the band, and then dried at 130 ° C. for 30 minutes. Thereafter, the film was stretched 25% in the TD direction under the condition of 180 ° C. to produce a cellulose acylate film (film thickness 57 μm).
This film was used as film 8. This film had Re of 45 nm and Rth of 120 nm.

2. Preparation of antireflection plate Formation of antireflection layer 1:
Using any one of the films 1 to 8 prepared above as a support, the antireflection layer 1 was formed on the surface by the following method, and antireflection plates were produced. In addition, Re and Rth of the formed antireflection layer 1 were 0 nm.

(Preparation of sol solution a)
A stirrer, a reactor equipped with a reflux condenser, 120 parts of methyl ethyl ketone, 100 parts of acryloyloxypropyltrimethoxysilane (KBM-5103, manufactured by Shin-Etsu Chemical Co., Ltd.), 3 parts of diisopropoxyaluminum ethyl acetoacetate were added and mixed. Thereafter, 30 parts of ion-exchanged water was added and reacted at 60 ° C. for 4 hours, and then cooled to room temperature to obtain sol solution a. The mass average molecular weight was 1600, and among the components higher than the oligomer component, the component having a molecular weight of 1000 to 20000 was 100%. Further, from the gas chromatography analysis, the raw material acryloyloxypropyltrimethoxysilane did not remain at all. A sol solution a was prepared with methyl ethyl ketone so that the solid content concentration was 29%.

(Preparation of Dispersion B-1)
By changing the preparation conditions from Preparation Example 4 of JP-A-2002-79616, silica fine particles having cavities therein were produced. In the final step, the solvent was replaced with methanol from the aqueous dispersion state to obtain a 20% silica dispersion, and particles having an average particle diameter of 45 nm, a shell thickness of about 7 nm, and a refractive index of silica particles of 1.30 were obtained. This is designated as dispersion (A-1).
After adding 15 parts of acryloyloxypropyltrimethoxysilane and 1.5 parts of diisopropoxyaluminum ethyl acetate to 500 parts of the dispersion (A-1), 9 parts of ion-exchanged water were added. After reacting at 60 ° C. for 8 hours, the mixture was cooled to room temperature, and 1.8 parts of acetylacetone was added. The solvent was replaced by distillation under reduced pressure while adding MEK so that the total liquid volume was almost constant. Finally, a dispersion B-1 was prepared by adjusting the solid content to 20%.

The sol liquid a, the dispersion liquid B-1 and the components described in the following table were mixed in the following compositions, respectively, and dissolved in MEK to prepare a coating liquid L22 for a low refractive index layer having a solid content of 6%.
Composition of coating liquid L22 for low refractive index layer 46.0 parts by mass of fluorine-containing polymer P-23 shown below (fluorine content 42.7%)
DPHA 5.0 parts by mass Photopolymerization initiator “IRG369” 3.0 parts by mass (manufactured by Ciba Specialty Chemicals)
Sol liquid a 5.0 parts by mass Dispersion B-1 35 parts by mass Colloidal silica “MEK-ST-L” 9 parts by mass (manufactured by Nissan Chemical Industries, Ltd.)

(Preparation of coating liquid for hard coat layer (HCL-1))
90 parts by mass of MEK, 10 parts by mass of cyclohexanone, 85 parts by mass of partially caprolactone-modified polyfunctional acrylate (DPCA-20, manufactured by Nippon Kayaku Co., Ltd.), KBM-5103 (silane coupling agent: Shin-Etsu Chemical Co., Ltd.) 10 parts by mass) and 5 parts by mass of a photopolymerization initiator (Irgacure 184, manufactured by Ciba Specialty Chemicals Co., Ltd.) were added and stirred. It filtered with the polypropylene filter with the hole diameter of 0.4 micrometer, and prepared the coating liquid (HCL-1) for hard-coat layers.

A microgravure with a diameter of 50 mm having a gravure pattern with a line number of 180 lines / in and a depth of 40 μm, directly on the surface of each of the films 1 to 8 produced above, the hard coat layer coating liquid (HCL-1). Using a roll and a doctor blade, it was applied under the conditions of a gravure roll rotation speed of 30 rpm and a conveyance speed of 30 m / min, dried at 60 ° C. for 150 seconds, and further 160 W / cm at an oxygen concentration of 0.1 vol% under a nitrogen purge. Using an “air-cooled metal halide lamp” {manufactured by iGraphics Co., Ltd.}, an ultraviolet ray having an irradiance of 400 mW / cm ² and an irradiation amount of 50 mJ / cm ² is applied to cure the coating layer, and a layer having a thickness of 5.0 μm Formed. In this way, a hard coat layer (HC-1) was formed.

On the hard coat layer (HC-1) of each film, the low refractive index layer coating solution L22 is used to adjust the film thickness of the low refractive index layer to 95 nm, and is applied by a microgravure coating method. Then, the low refractive index layer was formed by curing under the following conditions.
(1) Drying: 80 ° C.-120 seconds (2) UV curing: 60 ° C.—1 minute, 240 W / cm air-cooled metal halide lamp (eye) while purging with nitrogen so that the oxygen concentration is 0.01% by volume or less. using graphics Co.), illuminance 120 mW / cm ^2, and the irradiation amount of dose 480 mJ / cm ^2.

  The light reflectance of the formed antireflection layer 1 was 1.5% regardless of the film used as the support.

Formation of the antireflection layer 2:
Using any of the films 1 to 8 prepared above as a support, an antireflection layer 2 was formed on the surface by the following method, and antireflection plates were produced. In addition, Re and Rth of the formed antireflection layer 2 were 0 nm.

(Preparation of coating solution for hard coat layer)
The following composition was put into a mixing tank and stirred to obtain a hard coat layer coating solution.
750.0 parts by mass of trimethylolpropane triacrylate (Biscoat # 295 (manufactured by Osaka Organic Chemical Co., Ltd.)), 270.0 parts by mass of poly (glycidyl methacrylate) having a mass average molecular weight of 15000, 730.0 parts by mass of methyl ethyl ketone, 500 cyclohexanone 0.0 parts by mass and 50.0 parts by mass of a photopolymerization initiator (Irgacure 184, manufactured by Ciba Specialty Chemicals Co., Ltd.) were added and stirred, and filtered through a polypropylene filter having a pore size of 0.4 μm to form a hard coat layer. A coating solution was prepared.

(Preparation of titanium dioxide fine particle dispersion)
As the titanium dioxide fine particles, titanium dioxide fine particles (MPT-129C, manufactured by Ishihara Sangyo Co., Ltd., TiO ₂ : Co ₃ O ₄ : containing cobalt and subjected to surface treatment using aluminum hydroxide and zirconium hydroxide: Al ₂ O ₃ : ZrO ₂ = 90.5: 3.0: 4.0: 0.5 mass ratio) was used.
The following dispersant (41.1 parts by mass) and cyclohexanone (701.6 parts by mass) were added to 257.7 parts by mass of the particles and dispersed by dynomill to prepare a titanium dioxide dispersion having a mass average diameter of 69 nm.

(Preparation of coating liquid A for medium refractive index layer)
In 99.0 parts by mass of the above titanium dioxide dispersion, 68.2 parts by mass of a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (DPHA), a photopolymerization initiator (Irgacure 907, Ciba Specialty Chemicals Co., Ltd.) )) 3.7 parts by mass, photosensitizer (Kayacure DETX, Nippon Kayaku Co., Ltd.) 1.2 parts by mass, methyl ethyl ketone 279.7 parts by mass and cyclohexanone 1049.1 parts by mass were added and stirred. . After sufficiently stirring, the solution was filtered through a polypropylene filter having a pore diameter of 0.4 μm to prepare a coating solution A for medium refractive index layer.

(Preparation of coating liquid B for medium refractive index layer)
Mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (DPHA) 95.8 parts by mass, photopolymerization initiator (Irgacure 907, manufactured by Ciba Specialty Chemicals Co., Ltd.), 5.2 parts by mass, photosensitizer (Kayacure DETX, manufactured by Nippon Kayaku Co., Ltd.) 1.7 parts by mass, 279.7 parts by mass of methyl ethyl ketone and 1118.6 parts by mass of cyclohexanone were added and stirred. After sufficiently stirring, the solution was filtered through a polypropylene filter having a pore size of 0.4 μm to prepare a coating solution B for medium refractive index layer.

  An appropriate amount of the medium refractive index coating solution A and the medium refractive index coating solution B was mixed so that the refractive index after curing was 1.638 to prepare a medium refractive index coating solution.

(Preparation of coating liquid A for high refractive index layer)
To 469.9 parts by mass of the above titanium dioxide dispersion, 40.1 parts by mass of a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (DPHA, Nippon Kayaku Co., Ltd.), a photopolymerization initiator (Irgacure 907) , Ciba Specialty Chemicals Co., Ltd.) 3.4 parts by mass, photosensitizer (Kayacure DETX, Nippon Kayaku Co., Ltd.) 1.1 parts by mass, methyl ethyl ketone 526.0 parts by mass, and cyclohexanone 459. 8 parts by mass was added and stirred. Filtration through a polypropylene filter having a pore diameter of 0.4 μm prepared a coating solution A for a high refractive index layer.

(Preparation of coating liquid B for high refractive index layer)
16. Mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (DPHA, Nippon Kayaku Co., Ltd.) 166.2 parts by mass, photopolymerization initiator (Irgacure 907, Ciba Specialty Chemicals Co., Ltd.) 14. 1 part by mass, 4.6 parts by mass of photosensitizer (Kayacure DETX, manufactured by Nippon Kayaku Co., Ltd.), 526.0 parts by mass of methyl ethyl ketone, and 789.5 parts by mass of cyclohexanone were added and stirred. A high refractive index layer coating solution B was prepared by filtration through a polypropylene filter having a pore size of 0.4 μm.

  A high refractive index layer coating liquid A and a high refractive index coating liquid B were mixed in an appropriate amount so that the refractive index after curing was 1.845 to prepare a high refractive index layer coating liquid.

(Preparation of coating solution for low refractive index layer)
(Synthesis of perfluoroolefin copolymer (1))

Into an autoclave with a stirrer made of stainless steel having an internal volume of 100 ml, 40 ml of ethyl acetate, 14.7 g of hydroxyethyl vinyl ether and 0.55 g of dilauroyl peroxide were charged, and the inside of the system was deaerated and replaced with nitrogen gas. Furthermore, 25 g of hexafluoropropylene (HFP) was introduced into the autoclave and the temperature was raised to 65 ° C. The pressure when the temperature in the autoclave reached 65 ° C. was 0.53 MPa (5.4 kg / cm ² ). The reaction was continued for 8 hours while maintaining the temperature, and when the pressure reached 0.31 MPa (3.2 kg / cm ² ), the heating was stopped and the mixture was allowed to cool. When the internal temperature dropped to room temperature, unreacted monomers were driven out, the autoclave was opened, and the reaction solution was taken out. The obtained reaction solution was poured into a large excess of hexane, and the polymer was precipitated by removing the solvent by decantation. Further, this polymer was dissolved in a small amount of ethyl acetate and reprecipitated twice from hexane to completely remove the residual monomer. After drying, 28 g of polymer was obtained. Next, 20 g of the polymer was dissolved in 100 ml of N, N-dimethylacetamide, and 11.4 g of acrylic acid chloride was added dropwise under ice cooling, followed by stirring at room temperature for 10 hours. Ethyl acetate was added to the reaction solution, washed with water, the organic layer was extracted and concentrated, and the resulting polymer was reprecipitated with hexane to obtain 19 g of perfluoroolefin copolymer (1). The resulting polymer had a refractive index of 1.422.

(Preparation of sol solution a)
A stirrer, a reactor equipped with a reflux condenser, 120 parts of methyl ethyl ketone, 100 parts of acryloyloxypropyltrimethoxysilane (KBM-5103, manufactured by Shin-Etsu Chemical Co., Ltd.), diisopropoxyaluminum ethyl acetoacetate (trade name: Kerope EP) -12, manufactured by Hope Pharmaceutical Co., Ltd.) 3 parts were added and mixed, and then 31 parts of ion exchange water was added and reacted at 61 ° C. for 4 hours, followed by cooling to room temperature to obtain sol solution a. The mass average molecular weight was 1620, and among the components higher than the oligomer component, the component having a molecular weight of 1000 to 20000 was 100%. Further, from the gas chromatography analysis, the raw material acryloyloxypropyltrimethoxysilane did not remain at all.

(Preparation of hollow silica dispersion)
Hollow silica fine particle sol (isopropyl alcohol silica sol, CS60-IPA manufactured by Catalytic Chemical Industry Co., Ltd., average particle diameter 60 nm, shell thickness 10 nm, silica concentration 20%, silica particle refractive index 1.31) in 500 parts, acryloyloxypropyl After adding 30.5 parts of trimethoxysilane and 1.51 parts of diisopropoxyaluminum ethyl acetate and mixing, 9 parts of ion-exchanged water was added. After reacting at 60 ° C. for 8 hours, the mixture was cooled to room temperature, and 1.8 parts of acetylacetone was added to obtain a dispersion. Then, while adding cyclohexanone so that the silica content was substantially constant, the solvent was replaced by distillation under reduced pressure at a pressure of 30 Torr. Finally, a dispersion having a solid content concentration of 18.2% was obtained by adjusting the concentration. When the amount of IPA remaining in the obtained dispersion was analyzed by gas chromatography, it was 0.5% or less.

Using the obtained hollow silica dispersion or sol solution, a composition having the following composition was mixed, and the resulting solution was stirred and then filtered through a polypropylene filter having a pore size of 1 μm to obtain a coating solution A for a low refractive index layer. Was prepared.
(Composition of coating liquid A for low refractive index layer)
DPHA 1.6g
P-1 6.3g
Hollow silica dispersion (18.2%) 35.9 g
RMS-033 0.5g
Irgacure 907 0.3g
Sol liquid a 7.4 g
MEK 288.0g
Cyclohexanone 10.0g
The above symbols have the following meanings.
P-1: Perfluoroolefin copolymer (1)
DPHA: Mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (manufactured by Nippon Kayaku Co., Ltd.)
Hollow silica dispersion: Hollow silica sol surface-modified with acryloyloxypropyltrimethoxysilane, solid content concentration 18.2%.
MEK: methyl ethyl ketone RMS-033: reactive silicone (manufactured by Gelest Co., Ltd.)
・ Irgacure 907: Photopolymerization initiator (manufactured by Ciba Specialty Chemicals)

(Preparation of hard coat A)
The coating liquid for hard coat layers having the above composition was applied to each surface of the films 1 to 8 prepared above using a gravure coater. After drying at 100 ° C., an irradiance of 400 mW / cm using an air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) of 160 W / cm while purging with nitrogen so that the oxygen concentration becomes 1.0 vol% or less. ² , the coating layer was cured by irradiating with an irradiation amount of 300 mJ / cm ² to form a hard coat layer having a thickness of 8 μm.

  On the above hard coat A, there are three coating stations for a medium refractive index layer coating solution, a high refractive index layer coating solution, and a low refractive index layer coating solution, each adjusted to have a desired refractive index. It apply | coated continuously using the gravure coater.

The medium refractive index layer was dried at 90 ° C. for 30 seconds, and the ultraviolet curing condition was 180 W / cm air-cooled metal halide lamp (eye graphics) while purging with nitrogen so that the atmosphere had an oxygen concentration of 1.0% by volume or less. ), And the irradiation dose was 400 mW / cm ² and the irradiation dose was 400 mJ / cm ² .
The refractive index of the medium refractive index layer after curing was about 1.65 and the layer thickness was about 65.5 nm.

The drying condition of the high refractive index layer is 90 ° C. for 30 seconds, and the ultraviolet curing condition is a 240 W / cm air-cooled metal halide lamp (eye graphics) while purging with nitrogen so that the atmosphere has an oxygen concentration of 1.0% by volume or less. ), And the irradiation dose was 600 mW / cm ² and the irradiation dose was 400 mJ / cm ² .
The refractive index of the high refractive index layer after curing was about 1.85, and the layer thickness was about 110 nm.

The low refractive index layer was dried at 90 ° C. for 30 seconds, and the ultraviolet curing condition was 240 W / cm air-cooled metal halide lamp (eye graphics) while purging with nitrogen so that the atmosphere had an oxygen concentration of 0.1% by volume or less. ), And the irradiation amount was 600 mW / cm ² and the irradiation amount was 600 mJ / cm ² .
The refractive index of the low refractive index layer after curing was 1.42, and the layer thickness was about 86 nm.

  The light reflectance of the formed antireflection layer 2 was 0.5% regardless of the film used as the support.

3. Preparation of λ / 4 plate (1) Formation of λ / 4 layer 1 using a discotic liquid crystal compound

(Alkaline saponification treatment)
After passing the film 2 through a dielectric heating roll having a temperature of 60 ° C. and raising the film surface temperature to 40 ° C., an alkali solution having the composition shown below is applied to one side 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 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)
On the long cellulose acetate film saponified as described above, an alignment film coating solution having the following composition was continuously applied with a # 14 wire bar. Drying was performed with warm air of 60 ° C. for 60 seconds, and further with warm air of 100 ° C. for 120 seconds.
Composition of alignment film coating solution ――――――――――――――――――――――――――――――――――――
Denatured polyvinyl alcohol 10 parts by weight Water 371 parts by weight Methanol 119 parts by weight Glutaraldehyde 0.5 parts by weight Photopolymerization initiator (Irgacure 2959, manufactured by Ciba Japan) 0.3 parts by weight ――――――――――――――――――――――――――――

(Formation of optically anisotropic layer containing discotic liquid crystalline compound)
The alignment film thus prepared was continuously rubbed. At this time, the longitudinal direction of the long film and the transport direction were parallel to each other, and the rotation axis of the rubbing roller was 45 ° clockwise with respect to the longitudinal direction of the film.

  A coating liquid containing a discotic liquid crystal compound having the following composition was continuously applied onto the prepared alignment film with a # 2.7 wire bar. The conveyance speed (V) of the film was 36 m / min. In order to dry the solvent of the coating solution and to mature the orientation of the discotic liquid crystal compound, the coating liquid was heated with warm air at 100 ° C. for 30 seconds and further with warm air at 120 ° C. for 90 seconds. Subsequently, the orientation of the liquid crystal compound was fixed by UV irradiation at 80 ° C. to form an optically anisotropic layer (film thickness 1.2 μm, Re at wavelength 550 nm was 137 nm, Rth was −75 nm), and an optical film was obtained. .

Composition of coating solution for optically anisotropic layer (C) ――――――――――――――――――――――――――――――――――――――
The following discotic liquid crystalline compound 91 parts by mass Ethylene oxide-modified trimethylolpropane triacrylate (V # 360, manufactured by Osaka Organic Chemical Co., Ltd.) 9 parts by mass Photopolymerization initiator (Irgacure 907, manufactured by Ciba Geigy) 3 parts by mass Sensitizer (Kayacure DETX, manufactured by Nippon Kayaku Co., Ltd.) 1 part by mass The following pyridinium salt 0.5 part by mass The above fluoropolymer (FP2) 0.4 part by mass Methyl ethyl ketone 195 parts by mass ―――――――――――――――――――――――――――――――――

(2) Formation of λ / 4 layer 2 using rod-like liquid crystal compound After saponifying the surface of cellulose acylate film 2 produced above with an alkaline solution, an alignment film coating solution having the following composition is formed on this film by a wire bar. 20 ml / m ^{2 was} applied with a coater. A film was formed by drying with warm air of 60 ° C. for 60 seconds and further with warm air of 100 ° C. for 120 seconds. Next, the formed film was rubbed in a 45 ° direction with respect to the longitudinal direction of the cellulose acylate film 2 to form an alignment film.

Composition of alignment film coating solution ―――――――――――――――――――――――――――――――――――
Denatured polyvinyl alcohol 10 parts by weight Water 371 parts by weight Methanol 119 parts by weight Glutaraldehyde 0.5 parts by weight ――――――――――――――――――――――――――――― ―――――――

  Next, an optically anisotropic layer coating solution having the following composition was applied with a wire bar.

―――――――――――――――――――――――――――――――――――
The following rod-like liquid crystalline compound 1.8g
Ethylene oxide modified trimethylolpropane triacrylate (V # 360, manufactured by Osaka Organic Chemical Co., Ltd.) 0.2 g
Photopolymerization initiator (Irgacure 907, manufactured by Ciba Geigy) 0.06 g
Sensitizer (Kayacure DETX, Nippon Kayaku Co., Ltd.) 0.02g
Methyl ethyl ketone 3.9g
―――――――――――――――――――――――――――――――――――

  This was heated in a constant temperature bath at 125 ° C. for 3 minutes to align the rod-like liquid crystal compound. Next, using a 120 W / cm high pressure mercury lamp, UV irradiation was performed for 30 seconds to crosslink the rod-like liquid crystalline compound. The temperature during UV curing was set to 80 ° C. to obtain an optically anisotropic layer (Re at a wavelength of 550 nm was 137 nm, Rth was −75 nm). The thickness of the optically anisotropic layer was 2.0 μm. Then, it stood to cool to room temperature. In this manner, an optical film in which the optically anisotropic layer was applied on the cellulose acylate film 2 was produced.

(3) Preparation of stretched film 11-14 for λ / 4 plate Preparation of stretched film 11:
Cellulose acetate having a degree of acetyl substitution of 2.94 was solution cast and dried, uniaxially stretched at the fixed end, and then crystallized (heat treated) to obtain predetermined optical properties. The uniaxial film 11 was used. This film had Re of 138 nm and Rth of 75 nm.

Preparation of stretched film 12:
After melt-forming ZEONOR, predetermined optical properties were obtained by uniaxial stretching at the free end. Used as a stretched film 12. This film had Re of 138 nm and Rth of 75 nm.

Preparation of stretched film 13:
Polypropylene was melt-cast and then given optical properties by free end uniaxial stretching.
Used as a stretched film 13. This film had Re of 138 nm and Rth of 75 nm.

Preparation of stretched film 14:
The polycarbonate film was made to have predetermined optical characteristics depending on the stretching conditions.
Used as a stretched film 14. This film had Re of 138 nm and Rth of 75 nm.

(4) Preparation of stretched films 21 to 24 for λ / 4 plate Preparation of stretched film 21:
Cellulose acetate having an acetyl substitution degree of 2.45 was subjected to solution casting and drying, followed by biaxial stretching to obtain predetermined optical properties. Used as a stretched film 21. The Re of this film was 138 nm and Rth was 160 nm.

Preparation of stretched film 22:
After ZEONOR was melt-formed, predetermined optical characteristics were obtained by oblique stretching. Used as a stretched film 22. The Re of this film was 138 nm and Rth was 160 nm.

Preparation of stretched film 23:
Polypropylene was made into predetermined optical characteristics by fixed end stretching after melt film formation. Used as a stretched film 23. The Re of this film was 138 nm and Rth was 160 nm.

Preparation of stretched film 24:
The polycarbonate film was devised for stretching conditions to obtain predetermined optical characteristics. Used as a stretched film 24. The Re of this film was 138 nm and Rth was 160 nm.

4). Production of image display device (1) Preparation of translucent protective substrate and image display unit (when there is a gap)
As the VA mode liquid crystal panel, Sony KDL-40NX800 was used.

(3) Fabrication of image display device Fabrication of an image display device having the configuration shown in FIG.
The polarizing film and the viewing-side protective film were peeled off from the polarizing plate disposed on one surface of the liquid crystal panel to obtain a protective film on the image display unit side.
A polyvinyl alcohol (PVA) film having a thickness of 80 μm was dyed by being immersed in an aqueous iodine solution having an iodine concentration of 0.05 mass% at 30 ° C. for 60 seconds. Next, the film was longitudinally stretched 5 times the original length while immersed in an aqueous boric acid solution having a boric acid concentration of 4% by mass for 60 seconds, and then dried at 50 ° C. for 4 minutes to obtain a polarized light having a thickness of 20 μm. A membrane was obtained.
Any of the protective film peeled from the panel, the produced polarizing film, and the antireflection plate prepared above was bonded via an adhesive (SK2057, manufactured by Soken Chemical Co., Ltd.).
Any one of the prepared antireflection plates was bonded only to both surfaces of the translucent protective substrate or only the surface on the viewing side. For the comparative example, the translucent protective substrate having no antireflection plate on any surface was used.
The gap of about 2 mm was left as it was.

  In Example 12, the antireflection plate was not bonded to any surface of the translucent protective substrate, and the liquid crystal panel, the translucent protective substrate, and the space were filled with translucent resin. As the translucent resin, “SVR1100” manufactured by Sony Chemical Co., Ltd. was filled and cured with ultraviolet rays to form a resin layer. By forming the resin layer, the number of optical interfaces is reduced and antireflection can be achieved. That is, Example 12 is an example which has a filling resin layer as an antireflection layer.

Production of an image display device having the configuration shown in FIG.
One of the λ / 4 plates prepared above is bonded to the surface of the polarizing film disposed on one surface of the liquid crystal panel, and one of the antireflection plates prepared above is further bonded to the surface. did.
Any one of the prepared antireflection plates was bonded only to both surfaces of the translucent protective substrate or only the surface on the viewing side. For the comparative example, the translucent protective substrate having no antireflection plate on any surface was used.
These were laminated 2 mm apart to produce image display devices having the same configuration as in FIG. The 2 mm gap was left as it was.

(4) Evaluation of image display device Evaluation of external light reflection:
The light of the fluorescent lamp was reflected on the surface of the image display device, and the degree of reflection was visually evaluated. The reflection was weak and good enough not to be bothered, and was evaluated according to the following criteria.
◎◎: Excellent
◎: Very Good
○: Good
Δ: neither good nor bad
×: Bad (Bad)
XX: Very bad

Front crosstalk, brightness evaluation:
The front polarizing plate was peeled off, and the polarizing plates of Examples and Comparative Examples were bonded. Moreover, the polarizing plate on the TV side used for the liquid crystal shutter glasses was peeled off. Next, a λ / 4 plate was placed between the polarizing plate on the left eye / right eye side and the liquid crystal layer so that the slow axis and the slow axis of the liquid crystal were perpendicular.
A spectral radiance meter (manufactured by SR-3 Topcon) was placed at the position through the glasses, and the white luminance when each polarizing plate was bonded was measured from the front. When measuring the luminance from an oblique direction, the liquid crystal shutter glasses were aimed at the center of the screen.
Next, a composite image in which the right eye image was white and the left eye image was black was displayed as a 3D image, the luminance was measured through glasses for the right eye / left eye, and crosstalk evaluation (CRO) was performed using the following equation.
Note that CRO is Y_RR and Y_RL, respectively.
CRO = (Y_RR-Y_RL) / (Y_RR + Y_RL)
Defined by

The lower the crosstalk, the more the stereoscopic effect can be maintained. Crosstalk at the front is crosstalk when the face is tilted. Crosstalk in the oblique direction is crosstalk when the liquid crystal shutter glasses placed in the oblique direction are directed toward the center of the screen. These were evaluated according to the following criteria. The image display device having the same configuration as that shown in FIG. 1 is observed and evaluated using linearly polarized glasses, and the image display device having the same configuration as that shown in FIG. 3 is observed using circularly polarized glasses. evaluated. The same applies to “diagonal crosstalk and luminance evaluation” described later.
◎◎: Excellent
◎: Very Good
○: Good
Δ: neither good nor bad
×: Bad (Bad)
XX: Very bad

Oblique crosstalk, brightness evaluation:
Evaluation was made according to the following criteria as in 0091, except that the measurement direction was a polar angle of 60 degrees and an azimuth angle of 45 degrees (hereinafter referred to as an oblique direction) from the front.
◎◎: Excellent
◎: Very Good
○: Good
Δ: neither good nor bad
×: Bad (Bad)
XX: Very bad

The evaluation results are shown in the following table. The total reflectance shown in the table is the total reflectance of all the antireflection layers arranged, but the antireflection plate is arranged only on the viewing side surface of the translucent protective substrate, and the other surface. In the example not arranged, the reflectance of 4.0% on the surface of the glass plate used as the substrate was added. In the following table, layer 1 and layer 2 mean antireflection layers 1 and 2, respectively, DLC layer means λ / 4 layer 1, and RLC layer means λ / 4 layer 2. The values in parentheses indicate the Re and Rth values (Re (nm) / Rth (nm)) of each member. The antireflection layers 1 and 2, the translucent protective substrate, and the gap are Since Re and Rth were almost 0 nm, they were omitted.
In the table below, the total of Re is the total of members other than the λ / 4 layer, and the total of Rth is the total of all members.

1, 1 ′ image display device 2 outer polarizing film (second polarizing film)
3 λ / 4 layer (second λ / 4 layer)
DESCRIPTION OF SYMBOLS 10 Image display part 11 1st polarizing film 12 Translucent protective substrate 14 Space | gap or filling resin layer 16 Antireflection board 16a Antireflection layer 16b Antireflection layer support 20 λ / 4 layer (first λ / 4 layer) )
20a λ / 4 layer 20b λ / 4 layer support

Claims (11)

An image display device having at least a first polarizing film and a translucent protective substrate in this order in front of the image display unit and the viewing side of the image display unit,
Between the first polarizing film and the translucent protective substrate, a gap, or a filling resin layer,
At least one antireflection layer is disposed between the first polarizing film and the translucent protective substrate;
The absolute value of the sum of the thickness direction retardations Rth (550) at a wavelength of 550 nm of all members disposed on the front side of the first polarizing film on the viewing side is 20 nm or less; and the first polarizing film When the first λ / 4 layer is provided between the protective substrate or in front of the protective substrate and further on the viewing side, the first polarizing film is disposed in front of the viewing side of the first polarizing film. The absolute value of the sum of the in-plane retardations Re (550) at a wavelength of 550 nm of all members other than one λ / 4 layer is 10 nm or less; or between the first polarizing film and the protective substrate Or, if the first λ / 4 layer is not further provided in front of the protective substrate on the viewing side, Re (550) of all members disposed on the viewing side in front of the first polarizing film. ) Is an absolute value of 10 nm or less. A display device,
A 3D image display system having at least a second polarizing film for transmitting an image displayed on the image display device and allowing the image to be viewed as a 3D image. 2. The 3D image display according to claim 1, further comprising: a polymer film that supports the at least one antireflection layer or the first λ / 4 layer, wherein an absolute value of Rth (550) of the polymer film is 10 nm or less. System . A polymer film that supports the at least one antireflection layer or the first λ / 4 layer, and further includes a polymer film that exhibits Rth (550) that is different from Rth (550) of the polymer film. The 3D image display system according to 1 or 2. The 3D image display system according to any one of claims 1 to 3, wherein the total reflectance of the at least one antireflection layer is 3% or less. The 3D image display system according to any one of claims 2 to 4, wherein the polymer film is a polymer film containing a cellulose acylate, an acrylic polymer, or a cyclic olefin polymer as a main component. The 3D image display system according to claim 1, wherein the λ / 4 layer is a layer made of a composition containing a liquid crystal compound. 6. The 3D image display system according to claim 5, wherein the λ / 4 layer is a layer formed by fixing a composition containing a discotic liquid crystal compound in a vertically aligned state. The 3D image display system according to claim 5, wherein the λ / 4 layer is a layer formed by fixing a composition containing a rod-like liquid crystal compound in a horizontal alignment state. The 3D image display system according to any one of claims 1 to 5, wherein the λ / 4 layer is optically composed of a uniaxial or biaxial retardation film. The 3D image display system according to any one of claims 2 to 4, wherein the λ / 4 layer is a retardation film containing cellulose acylate, a cyclic olefin polymer, polypropylene, or polycarbonate as a main component. The 3D image according to any one of claims 1 to 10, wherein an angle formed by an absorption axis of the first polarizing film and a slow axis of the first λ / 4 layer is 45 ° or 135 °. Display system .

Images