TW202346987A - Polarizing plate laminate for liquid crystal display device, and liquid crystal display device - Google Patents

Abstract

The present invention provides a polarizing plate laminate for liquid crystal display device which are capable of avoiding occurrence of image blurring and gradation inversion when assembled to a liquid crystal display device. A polarizing plate laminate for liquid crystal display device according to the present invention has at least a polarizing plate, an anisotropic light diffusion film with a linear transmittance which changes according to the incident angle of light, and an optical compensation film; wherein the polarizing plate, the anisotropic light diffusion film and the optical compensation film are directly laminated or laminated via other layers in this order; the anisotropic light diffusion film has a matrix area and a plurality of columnar areas with a refractive index different from that of the matrix area; the plurality of columnar areas are configured to align and extend from one surface to the other surface of the anisotropic light diffusion film; and the polarizing plate laminate for liquid crystal display device is laminated on a liquid crystal cell of the liquid crystal display device in such a manner that the polarizing plate is positioned at the recognition side of the optical compensation film.

Description

Polarizing plate laminate for liquid crystal display device and liquid crystal display device

The present invention relates to a polarizing plate laminated body used in a liquid crystal display device and a liquid crystal display device provided with the polarizing plate laminated body.

Until now, liquid crystal display devices using a transmission type twisted nematic (Twisted Nematic; TN) drive system have been widely used. However, when the display device is viewed from an oblique direction at a specific orientation, there will be problems related to the viewing angle, such as reduced brightness and contrast, and a different color tone (color gradation inversion) when viewed from the front.

In a TN drive type liquid crystal display device, an optical compensation film (retardation film) or the like is used in order to improve the viewing angle. An example of an optical compensation film is an alignment film that uses triacetyl cellulose (TAC) as a support, performs alignment treatment on the alignment film, and further forms a disk-shaped liquid crystal layer thereon. (For example, WV film manufactured by FUJIFILM Corporation), etc.

However, when such an optical compensation film is used alone, the viewing angle enlarging effect is not sufficient. For example, when viewing the front direction of a liquid crystal display device from up, down, left, and right directions, there is a problem that viewing angle expansion can be achieved in three directions (up, down, left, and right), while color gradation is inverted in the remaining one direction.

In this regard, Patent Document 1 discloses a technology of a wide viewing angle compensation polarizing plate that can expand viewing angle characteristics.

[Prior technical literature]

[Patent Document]

[Patent Document 1] Japanese Patent Application Publication No. 2005-352404

However, in the wide viewing angle compensating polarizing plate of Patent Document 1, image blur may occur, and tone inversion may occur, resulting in insufficient visibility.

In this regard, an object of the present invention is to provide a polarizing plate laminate for a liquid crystal display device that can improve visibility when assembled into a liquid crystal display device.

A polarizing plate laminate system for a liquid crystal display device according to one aspect of the present invention at least includes a polarizing plate, an anisotropic light diffusion film whose linear transmittance changes depending on the incident angle of light, and an optical compensation film;

The aforementioned polarizing plate, the aforementioned anisotropic light diffusion film and the aforementioned optical compensation film are laminated in sequence directly or through other layers;

The aforementioned anisotropic light diffusion film system has a matrix region and a plurality of columnar regions with different refractive indexes from the aforementioned matrix region;

The plurality of columnar regions are aligned from one surface of the anisotropic light diffusion film and extend to the other surface; and,

In this polarizing plate lamination system for a liquid crystal display device, the polarizing plate is laminated on the liquid crystal cell of the liquid crystal display device in such a manner that the polarizing plate is closer to the viewing side than the optical compensation film.

The optical compensation film is preferably formed of a material exhibiting negative uniaxiality.

The optical compensation film preferably has a layer containing a discotic liquid crystal compound formed on a transparent support, and the disc surface of the discotic liquid crystal compound is aligned obliquely with respect to the surface of the transparent support.

The linear transmittance of the aforementioned anisotropic light diffusion film when the incident angle of light is 0° is preferably 3% or more.

The scattering central axis angle of the anisotropic light diffusion film is preferably 15° to 60°.

The angle of the columnar region of the aforementioned anisotropic light diffusion film is preferably 10° to 40°.

The maximum linear transmittance of the aforementioned anisotropic light diffusion film is preferably 60% or less.

In a cross section perpendicular to the column axis of the columnar region, the average major diameter/average minor diameter of the columnar region, that is, the aspect ratio of the columnar region is preferably 2 to 12.

It is preferable that the polarizing plate is laminated with a protective film whose absolute value of the phase difference (Rth) in the thickness direction is 15 nm or less on the surface on the side of the anisotropic light diffusion film.

The aforementioned protective film is preferably triacetylcellulose (TAC), cycloolefin polymer (COP) or polymethylmethacrylate (PMMA).

A liquid crystal display device according to another aspect of the present invention includes the aforementioned polarizing plate laminate for a liquid crystal display device and a liquid crystal cell; and,

The polarizing plate lamination system for a liquid crystal display device is laminated on the liquid crystal unit in such a manner that the polarizing plate is closer to the viewing side than the optical compensation film.

The aforementioned liquid crystal display device is preferably a TN drive type.

According to the present invention, it is possible to provide a polarizing plate laminate for a liquid crystal display device that can prevent image blur, color gradation inversion, and the like when incorporated into a liquid crystal display device.

1:Light source

2: Detector

100:Polarizing plate

110:Polarizing film

120:Protective film

150:Polarizing plate

200:Anisotropic light diffusion film

210:Matrix area

220: Column area

300: Optical compensation film

400:LCD unit

A:Polarizing plate laminate

B: Liquid crystal display device

I: irradiation light

LA: long diameter

SA: short diameter

V: straight line

FIG. 1 is a conceptual cross-sectional view showing a structural example of the polarizing plate laminate A of the present invention.

Figure 2(1) is a conceptual diagram of a cross-section perpendicular to the surface (main surface) of the anisotropic light-diffusion film of the present invention. Figure 2(2) is a cross-section of the anisotropic light-diffusion film of the present invention perpendicular to the column axis in the columnar region. Concept illustration of cross section.

FIG. 3 is a conceptual diagram illustrating the scattering center axis P of the anisotropic light diffusion film of the present invention.

FIG. 4 is a graph showing an example of an optical profile of the anisotropic light diffusion film of the present invention.

FIG. 5 is a conceptual diagram showing a method for producing an optical curve of the anisotropic light diffusion film of the present invention.

FIG. 6 is a conceptual cross-sectional view of the liquid crystal display device B of the present invention.

The embodiments of the present invention will be described in detail below, but the present invention is not limited to the following.

In this specification, when the numerical range is described as "a to b", unless otherwise specified, it means a or more and b or less.

<<<<Polarizing plate laminate A>>>>

As shown in FIG. 1 , the polarizing plate laminated body A system includes a polarizing plate 100 , an anisotropic light diffusion film 200 , and an optical compensation film 300 . The polarizing plate 100, the anisotropic light diffusion film 200, and the optical compensation film 300 are laminated in this order.

In addition, the polarizing plate laminated body A may have other layers as necessary. In other words, the polarizing plate 100, the anisotropic light diffusion film 200 and the optical compensation film 300 may be directly laminated in this order or may be laminated via other layers. The polarizing plate laminated body A may also have other layers as the outermost layer.

Each layer is explained below.

<<<Polarizing plate 100>>>

Generally speaking, the polarizing plate 100 is a plate-shaped member having a function of passing only light polarized in a specific direction. The polarizing plate 100 can be a conventional polarizing plate used in displays without particular limitation.

The polarizing plate 100 includes a polarizing film 110 . The polarizing film 110 is a film that allows light having a vibration surface in a certain direction to pass through the light incident on the polarizing film 110 and absorbs light having a vibration surface orthogonal to the certain direction.

Examples of the material of the polarizing film 110 include PVA-based resin. Typically, the polarizing film 110 is formed by adsorbing dichroic dyes such as alignment iodine compounds on PVA resin. More specifically, the polarizing film 110 can be produced by dyeing a film made of PVA resin with a dichroic dye, uniaxially stretching the film, and then subjecting the film to a boric acid cross-linking treatment.

In addition, the polarizing plate 100 preferably includes a protective film 120 laminated (laminated) to at least one side of the polarizing film 110 . The protective film 120 is laminated on the surface of the polarizing film 110 for the purpose of physically protecting the polarizing film 110 . The protective film 120 usually has visible light transmittance.

The protective film 120 is preferably laminated (laminated) on both sides of the polarizing film 110 as shown in FIG. 1 , but may also be laminated (laminated) on only one side of the polarizing film 110 .

The polarizing plate 100 is preferably formed by laminating the protective film 120 on at least the surface on the anisotropic light diffusion film 200 side. In other words, it is preferable that the protective film 120 is interposed between the anisotropic light diffusion film 200 and the polarizing film 110 .

When the protective film 120 is laminated (laminated) on both sides of the polarizing film 110 , the first protective film 120 and the second protective film 120 may be films of the same nature, or may be films of different natures.

As for the material of the protective film 120, if it has the function of protecting the polarizing film 110, there is no particular restriction. However, triacetyl cellulose (TAC), cycloolefin polymer (COP) or polymethylmethacrylate ( PMMA) is preferred.

The absolute value of the phase difference (Rth) in the thickness direction of the protective film 120 (especially the protective film 120 provided on the surface of the polarizing film 110 on the anisotropic light diffusion film 200 side) is preferably 15 nm or less, more preferably 10 nm or less. , preferably below 5nm. By setting the phase difference in this way, changes in hue can be suppressed.

For the protective film 120 , let the refractive index in the direction (slow axis direction) when the refractive index in the film plane is maximum be nx, let the refractive index in the direction orthogonal to the slow axis in the plane be ny, and let the thickness When the refractive index in the direction is nz and the thickness is d, the phase difference (Rth) in the thickness direction of the protective film 120 can be defined by the following equation.

Rth=[(nx+ny)/2-nz]×d

The phase difference (Rth) was measured using a phase difference measuring device KOBRA-WR (manufactured by Oji Scientific Instruments Co., Ltd.) at 23° C. and a measurement wavelength of 590 nm.

The protective film 120 may also be surface-treated for the purpose of improving adhesion to the polarizing film 110 .

The polarizing film 110 and the protective film 120 can be bonded together using, for example, an energy ray curable adhesive, a water-soluble adhesive, or the like. In addition, the polarizing film 110 and the protective film 120 may be bonded together using a material of the same nature or similar to the resin material (for example, PVA-based resin) constituting the polarizing film 110 as an adhesive.

The thickness of the polarizing film 110 and the protective film 120 can be appropriately changed according to the design of the liquid crystal display device B and the like.

For the polarizing film 110 and the protective film 120, for example, Japanese Patent Application Laid-Open No. 2005-173495, Japanese Patent Application Laid-Open No. 2016-021034, Japanese Patent Application Laid-Open No. 2016-041778, Japanese Patent Application Laid-Open No. 2016-216618, Those disclosed in Japanese Patent Application Publication No. 2017-009886, Japanese Patent Application Publication No. 2017-066365, Japanese Patent Application Publication No. 2017-146431, Japanese Patent No. 6610020, International Publication No. WO2016/043241, etc.

<<<<Anisotropic light diffusion film 200>>>>

The anisotropic light diffusion film 200 is a film having a property (light anisotropy) in which linear transmittance changes depending on the incident angle of light. More specifically, the anisotropic light diffusion film 200 has the property that the linear transmittance of (the amount of transmitted light in the linear direction of the incident light)/(the amount of the incident light)×100 changes depending on the incident angle of the light.

The polarizing plate laminate A provided with such an anisotropic light diffusion film 200 and in which each layer is laminated in a predetermined order can significantly improve the visibility of the liquid crystal display device B (in particular, image blur can be prevented and the viewing angle can be expanded). .

The anisotropic light diffusion film 200 will be described in detail below.

<<Construction>>

FIG. 2(1) is a conceptual diagram of a cross-section perpendicular to the surface (main surface) of the anisotropic light-diffusion film 200, and FIG. 2(2) is a cross-section of the anisotropic light-diffusion film 200 perpendicular to the column axis of the columnar region 220. Concept map.

The anisotropic light diffusion film 200 has a matrix region 210 and a plurality of columnar regions 220 having a different refractive index from the matrix region 210, and the plurality of columnar regions 220 are formed from one surface (main surface) of the anisotropic light diffusion film 200. oriented and extended to the other surface (refer to Figure 2(1)).

Here, FIG. 2 shows a case where the aspect ratio of the columnar region 220 described later is high.

When the aspect ratio is low (for example, 1 or more but less than 2), when light parallel to the axial direction of the columnar region 220 is irradiated, the transmitted light is isotropically diffused. On the other hand, when the aspect ratio is high (for example, 2 or more), when light parallel to the axial direction is irradiated similarly, it diffuses according to the anisotropy corresponding to the aspect ratio.

The so-called difference in refractive index means that the degree of reflection of at least part of the light incident on the anisotropic light diffusion film 200 is different at the interface between the matrix region 210 and the columnar region 220, and is not particularly limited. It is known that these regions are formed when the material forming the anisotropic light diffusion film 200 hardens.

<Column area 220>

The length of the columnar region 220 is not particularly limited, and may be a length that extends from one surface of the anisotropic light diffusion film 200 to another surface, or may be a length that does not reach the other surface from one surface.

The polar angle formed by the normal direction of the main surface of the anisotropic light diffusion film 200 (set as 0°) and the extending direction of the columnar region (hereinafter, this polar angle may also be referred to as the columnar region angle) is 10°. It is preferably to 40°, more preferably 15° to 35°, more preferably 20° to 30°, particularly preferably 22° to 28°. By setting the angle of the columnar region in this way, the optical characteristics of the liquid crystal display device B can be improved (especially, the viewing angle can be enlarged).

Here, the angle of the columnar region can be adjusted by changing the direction of the irradiated light in the step of photohardening the uncured resin composition layer to form the columnar region, thereby adjusting the angle of the axial direction of the columnar region 220 to the desired range.

In the cross-section of the columnar region 220 perpendicular to the column axis, the cross-sectional shape of the columnar region 220 may have a short diameter and a long diameter.

The shape of the cross section perpendicular to the column axis of the columnar region 220 is not particularly limited, and may be, for example, a circle, an ellipse, or a polygon. When the cross-section is circular, the short diameter and long diameter are equal; when the cross-section is elliptical, The minor diameter is the length of the minor axis, and the major diameter is the length of the major axis. When the cross section is a polygon, the shortest length in the polygon can be set as the minor diameter, and the longest length can be set as the major diameter.

The average short diameter (average short diameter) of the columnar region 220 (SA shown in FIG. 2(2)) is preferably 0.5 μm or more, more preferably 0.8 μm or more, and more preferably 1.0 μm or more. On the other hand, the average short diameter of the columnar region 220 is preferably 1.6 μm or less, and more preferably 1.4 μm or less. By setting the average minor diameter in this way, appropriate diffusivity can be expressed. Here, the lower limit value and the upper limit value of the short diameter of the columnar regions 220 can be combined appropriately.

The average long diameter (average long diameter) of the columnar region 220 (LA shown in FIG. 2(2)) is preferably 4.5 μm or more, more preferably 5.0 μm or more, and more preferably 5.5 μm or more. On the other hand, the average major diameter of the columnar region 220 is preferably 15.0 μm or less, more preferably 14.0 μm or less, and more preferably 12.0 μm or less. By setting the average major diameter in this way, the linear transmittance of light of the anisotropic light diffusion film 200 can be improved. Here, the lower limit and the upper limit of the major diameter of the columnar regions 220 can be combined appropriately.

The aspect ratio of the columnar region 220 is calculated as the ratio of the average major diameter to the average minor diameter (average major diameter/average minor diameter). The aspect ratio of the columnar region 220 is not particularly limited, but is preferably 2 to 12, more preferably 5 to 12, and more preferably 5 to 8. When the aspect ratio is set in this way, diffusion and image blur suppression can be easily achieved.

The average short diameter and average long diameter of the columnar region 220 are determined by observing the cross section of the columnar region 220 perpendicular to the column axis (the cross section near the thickness center of the anisotropic light diffusion film 200) using an optical microscope, and for 20 arbitrarily selected columns The short axis SA and the long axis LA of the shape area 220 are measured, and can be calculated as the average value of the short axis SA and the long axis LA.

<<Scattering central axis>>

The anisotropic light diffusion film 200 has a scattering central axis. The scattering central axis has a parallel relationship with the alignment direction (extending direction) of the columnar region. Here, the so-called scattering central axis is parallel to the alignment direction of the columnar region, and does not need to be strictly parallel as long as it satisfies the law of refractive index (Snell's law).

Snell's law means that when light is incident from the interface between a medium with a refractive index n ₁ and a medium with a refractive index n ₂ , the incident angle θ ₁ and the refraction angle θ ₂ satisfy the relationship n ₁ sinθ ₁ =n ₂ sinθ ₂ . For example, when n ₁ =1 (air) and n ₂ =1.51 (anisotropic light diffusion film), if the incident angle is 30°, the alignment direction (refraction angle) of the columnar region is approximately 19°, but even with this incident Angle is different from the angle of refraction. If it satisfies Snell's law, it is also included in the concept of parallelism.

Next, the scattering central axis in the anisotropic light diffusion film 200 will be described in more detail with reference to FIG. 3 . FIG. 3 shows three-dimensional polar coordinates for explaining the scattering central axis P of the anisotropic light diffusion film 200 .

As described above, the light diffusivity of the scattering central axis when the incident angle to the anisotropic light diffusion film 200 is changed has a direction consistent with the incident angle of light that is substantially symmetrical across the incident angle. Here, the scattering central axis angle of the incident angle at this time is the angle of the substantially central portion (the central portion of the diffusion region) enclosed by the minimum value in the optical curve that measures the straight line through the anisotropic light diffusion film 200 . The transmittance is calculated by plotting the straight-line transmittance at the incident angle.

來表現。亦即，圖3中的Pxy可謂投影於異方性光擴散膜200的表面的散射中心軸的長度方向。 According to the three-dimensional polar coordinates shown in Figure 3, when the surface of the anisotropic light diffusion film 200 is set as the xy plane, and the normal to the surface of the anisotropic light diffusion film 200 is set as the z-axis, the scattering central axis can be determined by the polar angle θ and azimuth angle

to perform. That is, Pxy in FIG. 3 can be said to be the length direction of the scattering central axis projected on the surface of the anisotropic light diffusion film 200 .

The angle of the scattering central axis can be adjusted by changing the direction of the irradiated light during the step of photohardening the uncured resin composition layer to form the columnar region, thereby adjusting the angle of the axial direction of the columnar region 220 to the desired value. range.

The scattering central axis angle θ of the anisotropic light diffusion film 200 is preferably 15° to 60°, more preferably 25° to 55°, more preferably 35° to 45°, and particularly preferably 35° to 43°. By setting the scattering center axis angle θ in this way, the optical characteristics of the liquid crystal display device B can be improved (especially, the viewing angle can be enlarged).

<<Optical curve>>

FIG. 4 is a graph showing an example of an optical curve in the anisotropic light diffusion film 200 in which the scattering central axis angle is 0°. The optical curve refers to a curve showing the incident angle dependence of light diffusivity. As shown in FIG. 4 , the anisotropic light diffusion film 200 has incident light angle dependence of light diffusivity such that the linear transmittance changes according to the incident angle.

The optical curve can be produced as follows, for example.

As shown in FIG. 5 , the anisotropic light diffusion film 200 is arranged between the light source 1 and the detector 2 . In this mode, when the irradiation light I from the light source 1 is incident from the normal direction of the anisotropic light diffusion film 200, the incident angle is 0°. In addition, the anisotropic light diffusion film 200 is arranged to be able to rotate arbitrarily with the straight line V as the rotation axis, but the light source 1 and the detector 2 are arranged in a fixed state. That is, according to this method, a sample (anisotropic light diffusion film) is placed between the light source 1 and the detector 2, and the straight line V on the surface of the sample is used as the rotation axis to change the angle, and at the same time, the straight line travels through the sample and enters the detector. The amount of straight-line penetrating light of 2. Here, the straight line V is an orientation orthogonal to the oblique orientation of the parallel light irradiation angle during the production of the anisotropic light diffusion film (in other words, an orientation orthogonal to the oblique orientation of the columnar region 220 of the anisotropic light diffusion film). Thereafter, the straight-line transmittance is calculated from the straight-line transmitted light amount, and the straight-line transmittance is plotted individually according to the angle to create an optical curve.

Through this evaluation method, it is possible to evaluate the angle range in which the incident light is mainly diffused.

The optical curve does not directly show the light diffusivity, but if it is explained that the linear transmittance decreases and the diffusion transmittance increases conversely, it can be said to roughly show the light diffusivity.

A general isotropic light diffusion film system has a mountain-shaped optical curve with a peak at an incident angle near 0°.

In contrast, for example, in the optical curve chart of the anisotropic light diffusion film 200 with a scattering center axis angle of 0° in FIG. 4 as an example, it is shown that a straight line passes through when the incident angle is near 0° (-20° to +20°). The transmittance is small, and as the absolute value of the incident angle increases compared to the incident angle near 0°, the linear transmittance also becomes larger.

In this way, the anisotropic light diffusion film 200 has the property that the incident light is strongly diffused in the incident angle range close to the scattering central axis, but when the incident angle range exceeds the aforementioned incident angle range, the diffusion is weakened and the linear transmittance is improved.

<<Linear penetration rate>>

As described above, the anisotropic light diffusion film 200 has the property that the linear transmittance of (the amount of transmitted light in the linear direction of the incident light)/(the amount of the incident light) × 100 changes depending on the incident angle of the light. In the present invention, the linear transmittance can be obtained by measuring the amount of linearly transmitted light when making optical curves.

<Linear transmittance when the incident angle is 0°>

The linear transmittance of light when the incident angle of the anisotropic light diffusion film 200 is 0° is preferably 3% or more, more preferably 5% or more, more preferably 8% or more, and particularly preferably 10% or more. There is no special limit on the upper limit, for example, it is 40%. By thus setting the linear transmittance of light when the incident angle is 0°, image blur can be suppressed.

<Linear transmittance when the incident angle is 60°>

The linear transmittance of light when the incident angle of the anisotropic light diffusion film 200 is 60° is preferably 10% or less, more preferably 5% or less, and more preferably 3% or less. By thus setting the linear transmittance of light when the incident angle is 60°, a sufficient viewing angle improvement effect can be demonstrated.

<Maximum linear penetration rate>

As shown in FIG. 4 , the linear transmittance of light when the light is incident on the anisotropic light diffusion film 200 at the incident angle at which the linear transmittance reaches the maximum is called the maximum linear transmittance.

The maximum linear transmittance of the anisotropic light diffusion film 200 is preferably 60% or less, more preferably 45% or less, and more preferably 30% or less. By setting the maximum linear transmittance in this way, the viewing angle improvement effect and image blur suppression can be easily achieved.

<Minimum linear penetration rate>

In addition, as shown in FIG. 4 , the linear transmittance of light when the light is incident on the anisotropic light diffusion film 200 at the incident angle at which the linear transmittance reaches the minimum is called the minimum linear transmittance.

The minimum linear transmittance of the anisotropic light diffusion film 200 is preferably 10% or less, more preferably 5% or less, and more preferably 3% or less. By setting the minimum linear transmittance in this way, the viewing angle improvement effect and image blur suppression can be easily achieved.

<Diffusion area, non-diffusion area>

As further shown in Figure 4, the angular range of the two incident angles of the linear transmittance corresponding to the intermediate value of the maximum linear transmittance and the minimum linear transmittance is called the diffusion area (the width of this diffusion area is called "Diffusion width"), and the incident angle range except this angle range is called the non-diffusion area (penetration area).

The linear transmittance can be adjusted according to curing conditions such as the refractive index of the material of the anisotropic light diffusion film 200 (the difference in refractive index when using multiple resins), the film thickness of the coating film, UV illuminance, and the temperature during structure formation.

<<Haze value>>

The haze value (total haze) of the anisotropic light diffusion film 200 is an index showing the diffusivity of the anisotropic light diffusion film 200 . The larger the haze value is, the higher the diffusivity of the anisotropic light diffusion film 200 is.

The method of measuring the haze value is not particularly limited, and it can be measured by a conventional method. For example, it can be measured in accordance with Japanese Industrial Standard JIS K7136-1:2000 "Method for Determining Haze of Plastic-Transparent Materials".

The haze value of the anisotropic light diffusion film 200 is not particularly limited, but 40% to 95% is preferred, 50% to 90% is more preferred, 60% to 85% is more preferred, and 60% to 80% is particularly preferred. . By setting the haze value in this way, it is easy to achieve both the viewing angle improvement effect and image blur suppression.

The haze value can be adjusted according to curing conditions such as the refractive index of the material of the anisotropic light diffusion film 200 (the difference in refractive index when using multiple resins), the film thickness of the coating film, UV illumination, and the temperature during structure formation.

<<Thickness>>

The thickness of the anisotropic light diffusion film 200 is not particularly limited, but is preferably 10 μm to 200 μm, more preferably 15 μm to 100 μm, and more preferably 20 μm to 60 μm. By setting the thickness in this way, manufacturing costs such as material costs and costs required for UV irradiation can be reduced, and the effect of improving visual dependence is sufficient. Here, in the present invention, the thickness is an average value of a total of five values measured including one near the four corners of the plane of the anisotropic light diffusion film 200 and one near the center of the plane.

<<Manufacturing method of anisotropic light diffusion film>>

The anisotropic light diffusion film 200 can be manufactured according to conventional methods, and the manufacturing method is not particularly limited. The anisotropic light diffusion film 200 can be produced by referring to the methods and raw materials described in Japanese Patent Application Laid-Open No. 2021-162733, Japanese Patent Application Laid-Open No. 2006-119241, and International Publication No. WO2014/084361, for example.

As an example, Japanese Patent Application Publication No. 2021-162733 discloses the following steps as the formation steps of the anisotropic light diffusion film 200 .

Step 1-1: Place the unhardened resin composition layer on the substrate

Step 1-2: Get parallel rays from the light source

Step 1-3: Make parallel light incident on the directional diffusion element to obtain directional light

Step 1-4: Irradiate light to the unhardened resin composition layer to harden the unhardened resin composition layer

At this time, in step 1-3, by adjusting the spread of the directional light E, etc., the shape (aspect ratio, minor axis SA, major axis LA, etc.) of the columnar region 220 in the anisotropic light diffusion film 200 can be adjusted. ).

In addition, in steps 1-4, by adjusting the angle at which parallel light rays are incident on the directional diffusion element, etc., the angle of the columnar region and the scattering central axis angle of the anisotropic light diffusion film 200 can be adjusted.

Here, the polarizing plate laminate A may be one in which two or more anisotropic light diffusion films 200 are laminated. At this time, the first anisotropic light diffusion film 200 and the other anisotropic light diffusion films 200 may have the same properties or may have different properties.

For example, the anisotropic light diffusion film 200 may be an anisotropic light diffusion film laminate having a first anisotropic light diffusion film and a second anisotropic light diffusion film, wherein the aspect ratio of one film is 2 to 10, and the other film has an aspect ratio of 2 to 10. The aspect ratio is 1 to 10, the scattering central axis angle of the first anisotropic light diffusion film is 20° to 35°, the scattering central axis angle of the second anisotropic light diffusion film is 40° to 55°, and the first anisotropic light diffusion film The orientations of the respective scattering central axes of the film and the second anisotropic light diffusion film form an angle of 0° to 40° with each other.

<<<Optical compensation film 300>>>

Generally speaking, the optical compensation film 300 is a film provided to adjust the phase difference of the liquid crystal display device B and expand the viewing angle.

The optical compensation film 300 is, for example, a transparent film such as cellulose triacetate, cycloolefin polymer, acrylic polymer, or polyester.

In addition, the optical compensation film 300 can also have a structure in which such a transparent film is used as a base material and a predetermined functional layer (for example, a layer composed of a discotic liquid crystal compound to be described later) is provided on the base material.

The optical compensation film 300 is preferably formed of a material exhibiting negative optical uniaxiality. Negative optical uniaxiality refers to a negative refractive index anisotropy in which the refractive index in the optical axis direction is smaller than the average refractive index in a plane perpendicular to the optical axis direction. Examples of such an optical compensation film 300 include those disclosed in Japanese Patent Application Laid-Open No. 2007-256765 and Japanese Patent Application Laid-Open No. 08-050206.

The polarizing plate laminate A provided with such an optical compensation film 300 and in which each layer is laminated in a predetermined order can improve the visibility of the liquid crystal display device B.

In addition, for the optical compensation film 300 formed of a material exhibiting negative optical uniaxiality, it is preferable that a layer composed of a disk-shaped liquid crystal compound is formed on a transparent support, and the disk-shaped liquid crystal compound has a circular shape. The disk surface is tilted relative to the surface of the transparent support. Examples of such an optical compensation film 300 include those disclosed in Japanese Patent Application Laid-Open No. 08-050206.

Examples of discotic liquid crystal compounds include disc-shaped compounds and compounds in which a disc surface is formed by a plurality of molecules. Examples include alkyl, alkoxy, and alkyl-substituted benzyl chloride. Linear substituents such as alkoxy-substituted benzyloxy group and the like are radially bonded to the mother core with a planar structure such as triphenylene, truxene and benzene. By.

The polarizing plate laminate A provided with such an optical compensation film 300 and in which each layer is laminated in a predetermined order can improve the visibility of the liquid crystal display device B.

The optical compensation film 300 may also be a commercially available product such as WV film manufactured by Fuji Film Co., Ltd.

<<<Other layers>>>

The polarizing plate laminated body A may have other layers. For example, the polarizing plate laminated body A may have an adhesive layer such as a transparent adhesive interposed between each layer (at least a part of the layers). At this time, the adhesive layer is preferably a translucent material that does not easily damage the optical properties of the polarizing plate laminate A. In addition, the polarizing plate laminate A may have conventional functional layers used in liquid crystal display devices, such as a hard coat layer (HC layer) and an anti-glare layer (AG layer).

<<<<Liquid crystal display device B>>>>

The polarizing plate laminate A is for use in liquid crystal display devices. In other words, the polarizing plate laminated body A is used as a member constituting the liquid crystal display device B.

The liquid crystal display device B may be any liquid crystal display device using a TN drive method, a VA drive method, an IPS drive method, etc., but a TN drive method is preferred.

In the liquid crystal display device B, the polarizing plate laminate A is laminated on the liquid crystal cell 400 such that the polarizing plate 100 is closer to the most visible side of the liquid crystal display device B than the optical compensation film 300 .

For example, when the polarizing plate laminated body A of this type is assembled into the liquid crystal display device B, the polarizing plate 150, the liquid crystal cell 400, and the polarizing plate laminated body A (optical compensation The film 300, the anisotropic light diffusion film 200, and the polarizing plate 100) are sequentially laminated (see FIG. 6). The first polarizing plate (polarizing plate 100 ) and the second polarizing plate (polarizing plate 150 ) are laminated to form orthogonal polarization.

On the other hand, a conventional liquid crystal display device has, for example, a layer structure in which a polarizing plate, a liquid crystal cell, and a polarizing plate are laminated in this order from the liquid crystal display device side toward the viewing side.

In this way, the liquid crystal display device B of this type has a different layer structure from the conventional liquid crystal display device. Specifically, the liquid crystal display device B of this type has the polarizing plate laminate A so that it will be closest to the viewing area. The polarizing plate (polarizing plate 100 ) is laminated on the liquid crystal cell 400 so that it is closer to the viewing side than the optical compensation film 300 . Since the liquid crystal display device B of this type has a predetermined multilayer structure, each layer can optimally exhibit its optical properties, thereby becoming a liquid crystal display device with excellent optical properties.

In addition, in the polarizing plate laminate A of this type, predetermined functional layers (protective film 120, HC layer, etc.) in the polarizing plate 100 can be arranged on the most visible side. As a result, the optical characteristics can be further improved, or a predetermined function (abrasion resistance, etc.) can be improved while maintaining the optical characteristics.

The polarizing plate 150 and the liquid crystal unit 400 can be made by those known in the art.

The liquid crystal unit 400 is composed of, for example, a first glass substrate, a transparent electrode film, a liquid crystal layer, a transparent electrode film, a color filter, and a second glass substrate.

The polarizing plate 150 may be the one described with the polarizing plate 100 , or may be other than the polarizing plate 150 .

Description of other layers (light source, other functional layers, etc.) included in the liquid crystal display device B is omitted here.

[Example]

Next, the present invention will be explained in more detail through examples and comparative examples, but the present invention is not limited to these examples.

<<Optical compensation film>>

The optical compensation film is a "WV film" (manufactured by Fuji Film Co., Ltd.) that forms a disc-shaped liquid crystal layer on a triacetylcellulose (TAC) film (hereinafter also referred to as TAC).

<<Anisotropic light diffusion film>>

A partition wall with a height of 20 to 50 μm was formed with a curable resin using a dispenser on the entire edge of a 100 μm-thick PET film (product of TOYOBO CO., LTD., trade name: A4300). The following ultraviolet curable resin composition is dropped therein to form a liquid film with a thickness of 20 μm to 50 μm, and is covered with another PET film.

‧Meta-phenoxybenzene methacrylate (refractive index: 1.57) 54 parts by mass

‧Copolymer composed of polymethyl methacrylate (PMMA) and polybutyl acetate (copolymer with 50% (meth)acrylate, refractive index: 1.48) 45 parts by mass

‧2,2-Dimethoxy-2-phenylacetophenone (product of IGM Resins B.V., trade name: Omnirad 651) 1.3 parts by mass

‧2,5-di-tertiary butyl-1,4-benzoquinone (product of Tokyo Chemical Industry Co., Ltd.) 0.02 parts by mass

A liquid film sandwiched between PET films on both sides was irradiated with an irradiation intensity of 10 mW/ through a directional diffusion element from an epi-illumination irradiation unit of a UV point light source (manufactured by Hamamatsu Photonics Corporation, trade name: L2859-01). cm ² to 100mW/cm ² parallel light ultraviolet rays.

Here, when ultraviolet rays are irradiated, the directional diffusion element expands the parallel light in the horizontal direction to adjust the aspect ratio of the columnar area. In addition, by adjusting the liquid film temperature, irradiation angle, etc. when irradiating parallel light extending in the horizontal direction, the linear transmittance, columnar area angle, scattering center axis angle, and haze value of the anisotropic light diffusion film were determined. adjust.

By adjusting the above parameters, the anisotropic light diffusion films 1 to 4 with PET attached to both sides of Examples having the optical properties in Table 1 were obtained.

<Thickness of anisotropic light diffusion film>

The anisotropic light diffusion film obtained in the Example was measured using a micrometer (manufactured by Mitutoyo Corporation). The thickness of the anisotropic light-diffusion film was determined as the average value of five measured values in total, including the four corners of the plane and the center of the plane.

<Scattering central axis angle and linear transmittance of anisotropic light diffusion film>

The linear penetration of the anisotropic light diffusion film obtained in the Example was determined using a Goniophotometer (manufactured by Genesia Corporation) that can arbitrarily change the projection angle of the light source 1 and the light receiving angle of the detector 2 as shown in FIG. 5 rate (including linear penetration rate when the incident angle is 0° and 60°).

The detector 2 is fixed at a position that can receive the straight light I from the fixed light source 1, and the sample holder therebetween is provided with the anisotropic light diffusion film obtained in the Example. At this time, it is set so that the direction orthogonal to the oblique direction in the parallel light irradiation angle at the time of manufacturing the anisotropic light diffusion film becomes the straight line direction of the straight line V shown in FIG. 5 .

Next, the anisotropic light diffusion film is rotated about the straight line V as an axis, and the amount of linearly transmitted light that travels straight through the anisotropic light diffusion film and enters the detector 2 is measured. After that, the straight-line transmittance is calculated based on the straight-line transmitted light amount, and the straight-line transmittance is plotted according to the angle to create an optical curve.

Here, the amount of linearly transmitted light is measured at wavelengths in the visible light range using a sensitivity filter.

Based on the optical curve obtained from the above measurement results, calculate the linear transmittance when the incident angle is 0°, the linear transmittance when the incident angle is 60°, the maximum linear transmittance, and the minimum linear transmittance, Then, the scattering central axis angle is obtained from the substantially central portion (the central portion of the diffusion region) between the minimum value in the optical curve.

<Angle of the columnar region, average major diameter, average minor diameter and aspect ratio of the columnar region of the anisotropic light diffusion film>

The cross section perpendicular to the column axis (the irradiation light side when irradiating ultraviolet rays) of the columnar area on the surface of the anisotropic light diffusion film obtained in the Example was observed with an optical microscope, and the angle of the columnar area (the angle of the main surface of the anisotropic light diffusion film) was measured. The polar angle formed by the normal direction (set to 0°) and the extension direction of the columnar region), the major axis LA and the minor axis SA of the columnar region. The angle of the columnar area, the average value of the long axis LA (average major axis), and the average value of the short axis SA (average short axis) are the average values of any 20 columnar areas. Furthermore, the average major axis/average minor axis SA was calculated as the aspect ratio.

<Haze value of anisotropic light diffusion film>

The haze value of the anisotropic light diffusion film obtained in the Example was measured using a haze meter NDH-2000 (manufactured by NIPPON DENSHOKU INDUSTRIES CO., LTD.).

[Table 1]

<<HC-TAC>>

To 100 parts by mass of neopentyl tetraacrylate, 3 parts by mass of the photopolymerization initiator Omnirad 184 (manufactured by IGM Resins B.V.) was added, and then toluene was added and stirred so that the solid content concentration became 50%, thereby preparing a hard coating (hard coating; HC) coating.

Next, the HC paint was applied with a hard coating method to TAC with a thickness of 60 μm and a retardation (Rth) in the thickness direction of 30 nm and dried, and then the UV point light source (Hamamatsu Photonics Co., Ltd. product, trade name: L2859 -01) The epi-irradiation irradiation unit irradiates ultraviolet rays with an irradiation intensity of 100 mW/cm ² to obtain HC-TAC having HC on the TAC. The thickness of the HC layer is 4 μm. In addition, after the TAC surface of HC-TAC was laminated on the glass surface so that it faced the glass, the surface pencil hardness of HC was measured under a load of 500 g according to the method of JIS K5600. The result was 2H.

<<Polarizing plate>>

<<Polarizing film>>

Using Example 1 of Japanese Patent No. 6610020 as a reference, after producing a polyvinyl alcohol-based film, a polarizing film was produced from the obtained polyvinyl alcohol-based film.

<Polarizing plate 1>

The TAC-side surface of the produced HC-TAC was bonded to one surface of the produced polarizing film, and TAC with a thickness of 60 μm and a retardation (Rth) in the thickness direction of 30 nm was bonded to the other surface to obtain a polarizing plate 1 .

Here, the polarizing plate 1 has a single transmittance of 44% and a polarization degree of 99.9%.

<Polarizing plate 2>

The TAC-side surface of the produced HC-TAC was bonded to one side of the produced polarizing film, and TAC with a thickness of 20 μm and a retardation (Rth) in the thickness direction of 4 nm was bonded to the other surface to obtain a polarizing plate 2 ( In the following, TAC with Rth=4nm is sometimes called zero-phase difference TAC).

Here, the single transmittance of the polarizing plate 2 is 44%, and the polarization degree is 99.9%.

<Polarizing plate 3>

The TAC side surface of the produced HC-TAC was bonded to one side of the polarizing film, and the TAC side of the WV film was bonded to the other side in a configuration that can obtain an optical compensation effect, thereby obtaining a polarizing plate 3 .

Here, the single transmittance of the polarizing plate 3 is 44%, and the polarization degree is 99.9%.

<Single transmittance and polarization degree of polarizing plate>

The optical properties (single transmittance and polarization degree) of the polarizing plate obtained in the Example were measured using an automatic polarizing film measuring device VAP7070 (manufactured by JASCO Corporation).

<<Transparent adhesive layer>>

An acrylic transparent adhesive layer with a thickness of 20 μm (product of TOMOEGAWA CO., LTD., trade name: TD06A) was used as the transparent adhesive layer.

<<Polarizing plate laminate>>

<Polarizing plate laminated body a>

The anisotropic light diffusion film 1 is layered on the TAC side of the polarizing plate 1 with a transparent adhesive layer interposed between the layers, and the WV film is layered on the TAC side of the anisotropic light diffusion film 1 on the opposite side of the polarizing plate 1 . , The polarizing plate laminated body a having the composition of "polarizing plate 1/transparent adhesive layer/anisotropic light diffusion film 1/transparent adhesive layer/WV film" was obtained. Here, in this embodiment, the WV film is arranged to obtain an optical compensation effect.

<Polarizing plate laminates b to d>

According to the combination shown in Table 2, except using the anisotropic light diffusion films 2 to 4 instead of the anisotropic light diffusion film 1, it was produced in the same manner as the polarizing plate laminate a to obtain "polarizing plate 1/transparent adhesive layer/anisotropic light Polarizing plate laminates b to d composed of any one of diffusion films 2 to 4/transparent adhesive layer/WV film.

<Polarizing plate laminated body e>

The production is carried out in the same manner as the polarizing plate laminated body a except that the polarizing plate 2 is used instead of the polarizing plate 1 and the anisotropic light diffusion film 1 is laminated on the zero phase difference TAC side surface of the polarizing plate 2 with a transparent adhesive layer interposed between the layers. , the polarizing plate laminated body e having the composition of "polarizing plate 2/transparent adhesive layer/anisotropic light diffusion film 1/transparent adhesive layer/WV film" was obtained.

<Polarizing plate laminated body f>

A "polarizing plate" is obtained by layering the WV film on the TAC side surface of the polarizing plate 1 with a transparent adhesive layer interposed between the layers, and layering the anisotropic light diffusion film 1 on the disk-shaped liquid crystal side surface of the WV film. Polarizing plate laminate f composed of 1/transparent adhesive layer/WV film/transparent adhesive layer/anisotropic light diffusion film 1″. Here, in this embodiment, the WV film is arranged to obtain an optical compensation effect.

<Polarizing plate laminated bodyg>

The anisotropic light diffusion film 1 is layered on the disc-shaped liquid crystal side area of the WV film of the polarizing plate 3 with a transparent adhesive layer interposed between the layers to obtain a composition of "polarizing plate 3/transparent adhesive layer/anisotropic light diffusion film 1" Polarizing plate laminate g. Here, in this embodiment, the WV film is arranged to obtain an optical compensation effect.

<Polarizing plate laminated body h>

The anisotropic light diffusion film 1 is layered on the TAC side of the polarizing plate 1 with a transparent adhesive layer interposed between the layers to obtain a polarizing plate laminate h composed of "polarizing plate 1/transparent adhesive layer/anisotropic light diffusion film 1" . Here, in this embodiment, the WV film is arranged to obtain an optical compensation effect.

<Polarizing plate laminated bodyi>

By laminating the polarizing plate 3 on the HC side of the HC-TAC of the anisotropic light diffusing film 1 with a transparent adhesive layer interposed between the layers, polarized light composed of "anisotropic light diffusing film 1/transparent adhesive layer/polarizing plate 3" is obtained. Laminated body i. Here, in this embodiment, the WV film is arranged to obtain an optical compensation effect.

<Polarizing plate laminated bodyj>

The anisotropic light diffusion film 1 is layered on the TAC side of the HC-TAC with a transparent adhesive layer interposed between the layers, and the HC-TAC of the polarizing plate 3 is layered on the area of the anisotropic light diffusion film 1 opposite to the HC-TAC. The HC side surface of the film was used to obtain a polarizing plate laminate j consisting of "HC-TAC/transparent adhesive layer/anisotropic light diffusion film 1/transparent adhesive layer/polarizing plate 3". Here, in this embodiment, the WV film is arranged to obtain an optical compensation effect.

<<Liquid crystal display device>>

<Example 1>

The backlight side surface of the TN drive type liquid crystal cell is the TAC side surface of the WV film of the polarizing plate 3 produced in the transparent adhesive laminate example.

Next, the polarizing plate laminate a is laminated via a transparent adhesive layer on the surface opposite to the backlight side surface of the liquid crystal cell so that the viewing side becomes the polarizing plate 1 . At this time, the absorption axes of the upper and lower polarizing plates (polarizing plate 1 and polarizing plate 3) laminated to form the liquid crystal cell are orthogonal to each other. A backlight and a drive circuit were added to obtain the liquid crystal display device 1 of Example 1. Here, in this embodiment, the WV film is arranged to obtain an optical compensation effect.

<Examples 2 to 5>

According to the combinations shown in Table 2, except that polarizing plate laminates b to e were used instead of polarizing plate laminate a, the same process was carried out as in Example 1 to obtain liquid crystal display devices 2 to 5 of Examples 2 to 5.

<Comparative example 1>

The production was carried out in the same manner as in Example 1 except that the polarizing plate 3 was used instead of the polarizing plate laminated body a, and the visible side became the HC-TAC of the polarizing plate 3, which was laminated via a transparent adhesive layer. Liquid crystal display device 6 of Example 1.

<Comparative Examples 2 to 4>

According to the combination shown in Table 2, except that the polarizing plate laminates f to h are used instead of the polarizing plate laminate a, and are laminated with a transparent adhesive layer in such a way that the visible side becomes a polarizing plate, it is the same as Example 1. It was produced in the same manner, and liquid crystal display devices 7 to 9 of Comparative Examples 2 to 6 were obtained.

<Comparative example 5>

It is the same as Example 1 except that the polarizing plate laminate i is used instead of the polarizing plate laminate a, and the anisotropic light diffusion film 1 of the polarizing plate laminate i is laminated via a transparent adhesive layer so that the visible side becomes the anisotropic light diffusion film 1 The liquid crystal display device 10 of Comparative Example 5 was obtained.

<Comparative Example 6>

The procedure was carried out in the same manner as in Example 1 except that the polarizing plate laminate j was used instead of the polarizing plate laminate a and the visible side was HC-TAC of the polarizing plate laminate j through a transparent adhesive layer. The liquid crystal display device 11 of Comparative Example 6 was produced.

Table 2 shows the relationship between the polarizing plate laminates a to j of Examples 1 to 5 and Comparative Examples 1 to 6 and the liquid crystal display devices 1 to 11 and the layer structures of the polarizing plate laminates a to j.

[Table 2]

<<Evaluation of liquid crystal display devices>>

<Image blur>

The liquid crystal display device obtained in the example displays 26 English lowercase letters in the "Times New Roman" font of 6 pt. When visually confirmed from the front direction, the characters can be clearly recognized and evaluated as ◎, and the outline is blurred but acceptable. Those with sufficient recognition were evaluated as ○, those with unclear details but still legible characters were evaluated as △, and those with difficult-to-recognize characters were evaluated as ×. The evaluation results are shown in Table 3.

<Color Inversion>

The liquid crystal display device obtained in the example displays a grayscale gradient image that changes sequentially in 24 stages from white to black, and can be visually confirmed from four directions, up, down, left, and right. The upper, lower, left and right directions are set to 12 o'clock, 6 o'clock, 9 o'clock, and 3 o'clock respectively. When observing the liquid crystal display screen from the viewing side, the characteristics of the WV film will deteriorate in viewing angle (color gradation is prone to occur). Reverse) direction is set to 6 o'clock. Install the LCD display When the normal direction of the screen is set to 0°, the evaluation is ○ when the color level inversion does not occur when viewed at a polar angle of 80° in each direction, and the color does occur when viewed at a polar angle of 60° or more and less than 80°. When the color level is inverted, the evaluation is △. When the color level inversion occurs when observed at a polar angle of less than 60°, the evaluation is ×. The evaluation results are shown in Table 3.

<Pencil Hardness>

The pencil hardness of the surface of the liquid crystal display device screen obtained in the Example was measured under a load of 500 g according to the method of JIS K5600. When H or above is evaluated, it is evaluated as ○, when it is less than H, it is evaluated as ×, and when it is less than 2B, it is evaluated as ××. The evaluation results are shown in Table 3.

[table 3]

<Evaluation results>

According to Table 3, the liquid crystal display devices of Examples 1 to 5 have good visibility and surface hardness. On the other hand, in the liquid crystal display devices of Comparative Examples 1 to 6, poor visibility was confirmed.

Based on the above description, when the polarizing plate laminate of the present invention is used in a TN drive liquid crystal cell, it is possible to form a liquid crystal display device that can prevent the occurrence of image blur or color gradation inversion.

A:Polarizing plate laminate

100:Polarizing plate

110:Polarizing film

120:Protective film

200:Anisotropic light diffusion film

300: Optical compensation film

Claims (12)

A polarizing plate laminate for a liquid crystal display device, which at least includes a polarizing plate, an anisotropic light diffusion film whose linear transmittance changes depending on the incident angle of light, and an optical compensation film; The aforementioned polarizing plate, the aforementioned anisotropic light diffusion film and the aforementioned optical compensation film are laminated in sequence directly or through other layers; The aforementioned anisotropic light diffusion film system has a matrix region and a plurality of columnar regions with different refractive indexes from the aforementioned matrix region; The plurality of columnar regions are aligned from one surface of the anisotropic light diffusion film and extend to the other surface; and, In this polarizing plate lamination system for a liquid crystal display device, the polarizing plate is laminated on the liquid crystal cell of the liquid crystal display device in such a manner that the polarizing plate is closer to the viewing side than the optical compensation film. The polarizing plate laminate for a liquid crystal display device according to claim 1, wherein the optical compensation film is formed of a material exhibiting negative uniaxiality. The polarizing plate laminate for a liquid crystal display device according to claim 1 or 2, wherein the optical compensation film has a layer composed of a disk-shaped liquid crystal compound formed on a transparent support, and the disk-shaped liquid crystal compound is a disk The surface is tilted with respect to the surface of the transparent support. The polarizing plate laminate for a liquid crystal display device according to any one of claims 1 to 3, wherein the anisotropic light diffusion film has a linear transmittance of 3% or more when the incident angle of light is 0°. The polarizing plate laminate for a liquid crystal display device according to any one of claims 1 to 4, wherein the anisotropic light diffusion film has a scattering center axis angle of 15° to 60°. The polarizing plate laminate for a liquid crystal display device according to any one of claims 1 to 5, wherein the angle of the columnar region of the anisotropic light diffusion film is 10° to 40°. The polarizing plate laminate for a liquid crystal display device according to any one of claims 1 to 6, wherein the anisotropic light diffusion film has a maximum linear transmittance of 60% or less. The polarizing plate laminate for a liquid crystal display device according to any one of claims 1 to 7, wherein in a cross section of the columnar region perpendicular to the column axis, the average major diameter/average minor diameter of the columnar region That is, the aspect ratio of the aforementioned columnar region is 2 to 12. The polarizing plate laminate for a liquid crystal display device according to any one of claims 1 to 8, wherein the polarizing plate has an absolute phase difference (Rth) in the thickness direction laminated on the surface on the side of the anisotropic light diffusion film. Protective film with a value below 15nm. The polarizing plate laminate for a liquid crystal display device according to claim 9, wherein the protective film is triacetylcellulose (TAC), cycloolefin polymer (COP) or polymethylmethacrylate (PMMA). A liquid crystal display device including the polarizing plate laminate for a liquid crystal display device according to any one of claims 1 to 10 and a liquid crystal cell; and, The polarizing plate lamination system for a liquid crystal display device is laminated on the liquid crystal unit in such a manner that the polarizing plate is closer to the viewing side than the optical compensation film. The liquid crystal display device according to claim 11, wherein the liquid crystal display device is a TN drive mode.

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