Nitto-denko Corporation

3m Innovative Properties Company

Hiroaki Sawada

Takeharu Kitagawa

Minoru Miyatake

Takashi Kamijo

Seiji Kondo

Tatsuya Araki

Masaki Hayashi

Takashi Shimizu

Shusaku Goto

Matthew B Johnson

Hiroyuki Yoshimi

Kentarou Takeda

Yutaka Fujita

Chikara Abe

Hiroyuki Morikazu

Atsushi Muraoka

An optical stack includes a liquid crystal panel with a color filter array. The liquid crystal panel has a filter side closest to the color filter array and a non-filter side opposite the filter side. An absorbing polarizer is laminated directly to the filter side of the liquid crystal panel, and a reflective polarizer laminated directly to the absorbing polarizer.

Optical stack including reflective polarizer and compensation film

The present invention provides a method of producing a thin polarizing film having both excellent optical characteristics and excellent in-plane uniformity. The method of producing a thin polarizing film includes stretching a thermoplastic resin substrate in a first direction, followed by formation of a polyvinyl alcohol-based resin layer on the thermoplastic resin substrate to prepare a laminate and shrinking and stretching the laminate in the first direction and a second direction, respectively.

Method for producing thin polarizing film

A method for producing a polarizer comprises the steps of: (A) stretching a polyvinyl alcohol-based resin layer to obtain a stretched layer; (B) immersing the stretched layer in a dyeing liquid containing iodine to obtain a dyed layer in which absorbance thereof determined from a tristimulus value Y is from 0.4 to 1.0 (transmittance T=40% to 10%); and (C) removing a part of iodine adsorbed in the dyed layer so that the absorbance of the dyed layer decreases by 0.03 to 0.7, provided that the absorbance of the dyed layer is controlled so that it does not become less than 0.3.

Method for producing polarizer

A method for producing a polarizer () comprises the steps of: (A) stretching a polyvinyl alcohol-based resin layer () to obtain a stretched layer (); (B) immersing the stretched layer () in a dyeing liquid () containing iodine to obtain a dyed layer () in which absorbance thereof determined from a tristimulus value Y is from 0.4 to 1.0 (transmittance T=40% to 10%); and (C) removing a part of iodine adsorbed in the dyed layer () so that the absorbance of the dyed layer () decreases by 0.03 to 0.7, provided that the absorbance of the dyed layer () is controlled so that it does not become less than 0.3.

There is provided an optical laminate that significantly suppresses the warping of a liquid crystal panel and can realize high contrast. An optical laminate of the present invention includes: a polarizing film having a thickness of 10 &#x3bc;m or less; and a reflective polarization film. A liquid crystal panel of the present invention includes: a liquid crystal cell; and the optical laminate of the present invention. According to another aspect of the present invention, an optical laminate set is provided. The optical laminate set includes: a first optical laminate that is the optical laminate of the present invention as described above; and a second optical laminate including a polarizing film having a thickness larger than the thickness of the polarizing film of the first optical laminate by 5 &#x3bc;m or more.

Optical laminated body, optical laminated body set, and liquid crystal panel using optical laminated body or optical laminated body set

A polarizing membrane according to an embodiment of the present invention includes a polyvinyl alcohol-based resin membrane containing a dichromatic substance. The polyvinyl alcohol-based resin membrane has an Nz coefficient of 1.10 or more and 1.50 or less.

Polarizing membrane and polarizing film

The present invention provides a method of producing a polarizing film having excellent optical characteristics. The method of producing a polarizing film of the present invention includes: forming a polyvinyl alcohol-based resin layeron a thermoplastic resin substrateto produce a laminate; dyeing the polyvinyl alcohol-based resin layerof the laminatewith iodine; stretching the laminate; and covering, after the dyeing and the stretching, a surface of the polyvinyl alcohol-based resin layerof the laminatewith a cover film having a moisture permeability of 100 g/m&#xb7;24 h or less, followed by heating of the laminateunder the state.

Method of producing polarizing film

A video image evaluation equipment of the present invention is capable of converting circularly-polarized light emitted from a circularly polarizing light source into linearly-polarized light so as to transmit an absorption-type linear polarizer by a wavelength plate to be incident on a liquid crystal panel. This makes it possible to enter and reflect light emitted from the circularly polarizing light source on the liquid crystal panel without loss, which leads to display brighter video images than conventional ones.

Growing community of inventors

Ibaraki, Japan

Hiroaki Sawada