Nitto-Denko Corporation

Akinori Izaki

Seiji Umemoto

Shusaku Goto

Takeharu Kitagawa

Takashi Kamijo

Minoru Miyatake

Kentarou Takeda

Tomohiro Mori

Yuu Sugimoto

Yutaka Ohmori

Mitsuru Suzuki

Shouji Yamamoto

Hisae Sugihara

Tetsushi Kunitake

Atsushi Yasui

Toshiyuki Iida

Daisuke Ogomi

Michie Sakamoto

Takuya Mori

Yuki Kida

Ryohei Sawazaki

Daigoro Nakagawa

A polarizing plate including an optical functional film and a polarizing film (polarizer), the polarizing plate being thin and excellent in durability of the polarizing film. The polarizing plate includes an optical functional film, a pressure-sensitive adhesive layer, a polarizing film, and a protective film in the stated order, in which: the polarizing film has a thickness of 15 &#x3bc;m or less; the pressure-sensitive adhesive layer has a thickness of 15 &#x3bc;m or less; the optical functional film has a moisture permeability of 200 g/m/24 h or less; and the protective film has a moisture permeability of 1,000 g/m/24 h or less.

Polarizing plate comprising an optical functional film and a protective film having a specified moisture permeability

There is provided a polarizer that can realize multi-functionalization and high-functionalization of an electronic device, such as an image display apparatus. A polarizer according to an embodiment of the present invention includes a resin film containing iodine, wherein the polarizer has formed therein a transparent portion having a transmittance higher than that of another portion, and when the polarizer is placed under an environment having a temperature of 60&#xb0; C. and a humidity of 90% for 2 hours, a transmittance change (&#x394;Ts) of the transparent portion is 10% or less.

Polarizer, polarizing plate, and image display apparatus

Provided are a cutting information determination method that can use a simpler process to improve yield, and a strip-shaped polarizing sheet manufacturing method using such a method, an optical display unit manufacturing method using such a method, a strip-shaped polarizing sheet, and a polarizing sheet material. A cutting position in the width direction A2, in which a polarizing sheet material MP is to be cut along its longitudinal direction A1, is determined based on the numbers of defects counted with respect to plural points in the width direction A2 of the polarizing sheet material MP. This makes it possible to determine the cutting position in such a way that a region with many defects does not fall within the cut width, so that a higher-yield cutting position can be determined. The cutting position can also be determined using a simple process in which defects are counted with respect to plural points in the width direction A2.

Strip-shaped polarizing sheet and polarizing sheet material

The present invention provides a thin polarizing film which has only a small environmental load and has excellent optical characteristics. The thin polarizing film is produced by forming a polyvinyl alcohol-based resin layer on a thermoplastic resin substrate. The thin polarizing film has a thickness of 10 &#x3bc;m or less, a single axis transmittance of 42.0% or more, a polarization degree of 99.95% or more, and an iodine content of 17.6 grams per 400&#xd7;700 square millimeters or less, which is measured by an ion chromatography method.

Thin polarizing film, optical laminate with thin polarizing film, and production method for thin polarizing film

An optical laminate in which a polarizing film including a polyvinyl alcohol-based resin having oriented iodine is bonded on a first surface of the polarizing film to an optical film through an optically transparent adhesive layer is provided. The polarizing film exhibits a property that a value expressed by the following formula: Aa&#xd7;(Is/Ia), is 0.53 or more, where: Aa represents an absorbance; Ia represents a value obtained by integrating a distribution of integrated intensities in the thickness direction of the polarizing film; and Is represents a value obtained by integrating, a distribution of integrated intensities in the thickness direction of the polarizing film; and the adhesive layer exhibits a property that a difference between a refractive index of the adhesive layer and a refractive index in the absorption axis direction of the polarizing film at the first surface of the polarizing film is 0.08 or less.

Optical laminate with polarizing film

Provided are a cutting information determination method that can use a simpler process to improve yield, and a strip-shaped polarizing sheet manufacturing method using such a method, an optical display unit manufacturing method using such a method, a strip-shaped polarizing sheet, and a polarizing sheet material. A cutting position in the width direction A, in which a polarizing sheet material MP is to be cut along its longitudinal direction A, is determined based on the numbers of defects counted with respect to plural points in the width direction Aof the polarizing sheet material MP. This makes it possible to determine the cutting position in such a way that a region with many defects does not fall within the cut width, so that a higher-yield cutting position can be determined. The cutting position can also be determined using a simple process in which defects are counted with respect to plural points in the width direction A

Cutting information determination method, and strip-shaped polarizing sheet manufacturing method therewith, optical display unit manufacturing method therewith, strip-shaped polarizing sheet, and polarizing sheet material

Provided is a liquid crystal display in which occurrence of iridescent unevenness is suppressed, even when a film with high level of mechanical properties, chemical resistance and water-barrier properties is used as a polarizer-protective-film. Also, disclosed is a polarizing plate to be used in the liquid crystal display. The liquid crystal display includes a liquid crystal cell, a light source, a first polarizing plate placed between the liquid crystal cell and the light source, and a second polarizing plate placed on a viewer side of the liquid crystal cell. The first polarizing plate includes a polarizer and a first protective film placed on a light source side principal surface of the first protective film, and the first protective film satisfies following relations: (i) 0 nm&#x2266;Re&#x2266;3000 nm; (ii) Nz&#x2267;5; and (iii) Rth&#x3e;2500 nm.

Liquid crystal display device and polarizing plate

Provided is an image display device including an image display cell and a polarizing plate placed on a viewer side of the image display cell. The first polarizing plate includes a polarizer and a first protective film. The first protective film is placed on a viewer-side principal surface of the polarizer and satisfies following relations: (i) 0 nm&#x2266;Re&#x2266;3000 nm; (ii) Nz&#x2267;7; and (iii) Rth&#x3e;2500 nm. Re, Rthand Nzare defined by following equations: Re=(nx&#x2212;ny)d; Rth=(nx&#x2212;nz)d; and Nz=Rth/Re, wherein drepresents a thickness of the first protective film, nxrepresents a refractive index in a direction of an in-plane slow axis of the protective film, nyrepresents a refractive index in a direction of an in-plane fast axis of the protective film, and nzrepresents a refractive index in a direction of the thickness of the protective film.

Image display device having polarizer with polarizer protection

There is provided a liquid crystal panel, in which a color shift in an oblique direction is small even when observed from any azimuth angle of 0&#xb0; to 360&#xb0;, and the viewing angle in the horizontal direction is wide. A liquid crystal panel according to the present invention includes: a liquid crystal cell; a first polarizer placed on one side of the liquid crystal cell; a second polarizer placed on the other side of the liquid crystal cell; and a first optical compensation layer and a second optical compensation layer placed between the first polarizer and the second polarizer, wherein: the first optical compensation layer is placed between the first polarizer and the liquid crystal cell; a slow axis direction of the first optical compensation layer is substantially perpendicular to an absorption axis direction of the first polarizer; the first optical compensation layer has a refractive index profile of nx&#x3e;ny&#x2267;nz; the first optical compensation layer includes a retardation film (A) which contains a polyvinyl acetal-based resin and whose in-plane retardation value (Re[750]) at a wavelength of 750 nm is larger than an in-plane retardation value (Re[550]) at a wavelength of 550 nm; the second optical compensation layer is placed between the first optical compensation layer and the second polarizer; and the second optical compensation layer has a refractive index profile of nx=ny&#x3e;nz.

Liquid crystal panel and liquid crystal display apparatus

There is provided a retardation film including a stretched film of a polymer film having an absolute value of photoelastic coefficient (m/N) of 50&#xd7;10or less measured by using light of a wavelength of 550 nm at 23&#xb0; C., which satisfies the following expressions (1) and (2):Re[450]&#x3c;Re[550]&#x3c;Re[650]&#x2003;&#x2003;(1)Rth[550]&#x3c;Re[550]&#x2003;&#x2003;(2).In the expressions (1) and (2): Re[450], Re[550], and Re[650] respectively represent in-plane retardation values measured by using light of wavelengths of 450 nm, 550 nm, and 650 nm at 23&#xb0; C.; and Rth[550] represents a thickness direction retardation value measured by using light of a wavelength of 550 nm at 23&#xb0; C.

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Ibaraki, Japan

Akinori Izaki