Retardation film

A retardation film and light scattering technology, which is applied in the direction of instruments, optics, optical components, etc., can solve the problems of poor transmittance, poor image ratio of liquid crystal display, etc., and achieve the effect of excellent frontal contrast

Active Publication Date: 2011-01-05
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The deterioration of the transmittance of the film can be attributed to the increase of the haze (scattering factor), which will cause the phenomenon that the front contrast of the liquid crystal display image deteriorates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0320]

[0321]

[0322] Particles (AEROSIL R972V Nippon Aerosil Co., Ltd.) 11 parts by mass

[0323] 89 parts by mass of ethanol

[0324] After stirring and mixing the above components for 50 minutes with a dissolver, it was dispersed with a Manton-Golin.

[0325]

[0326] While fully stirring, the fine particle dispersion 1 was slowly added to the dissolution tank filled with methylene chloride. Then, dispersion is performed using an attritor mill so that the particle size of the secondary particles becomes a specified size. This dispersion liquid was filtered using Finemet NF manufactured by Nippon Seisen Co., Ltd., to prepare a fine particle addition liquid 1.

[0327] Dichloromethane 99 parts by mass

[0328] Particle dispersion 15 parts by mass

[0329] The main glue liquid of the following composition was prepared. First, add dichloromethane and ethanol to a pressurized dissolution tank. While stirring, the cellulose esters A and B were charged into a pressu...

Embodiment 2

[0360]

[0361] A polyvinyl alcohol film having a thickness of 120 μm was uniaxially stretched (at a temperature of 110° C. and a stretching ratio of 5 times).

[0362] The film was dipped in an aqueous solution consisting of 0.075 g of iodine, 5 g of potassium iodide, and 100 g of water for 60 seconds, and then immersed in a 68° C. aqueous solution of 6 g of potassium iodide, 7.5 g of boric acid, and 100 g of water. This was washed with water, followed by drying to obtain a polarizer.

[0363] Then, according to the following steps 1 to 5, the polarizer was attached to the above-mentioned cellulose ester films 101 to 207, and KONICA MINOTA TAC KC4UY (a cellulose ester film manufactured by KONICA MINOLTA OPTO Co., Ltd.) was attached to the back side. ), thus making a polarizer.

[0364] Step 1: After immersing in a 2 mol / L sodium hydroxide solution at 60°C for 90 seconds, washing with water, followed by drying to obtain saponified cellulose ester on the side to be attached ...

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Abstract

Provided is a phase difference film having an excellent front contrast. It is possible to measure a scattered light intensity of a film of a 90-degree incident light of a scattered light profile by a goniophotometer. Provided is a phase difference film characterized in that the difference between the scattered light intensity integration values obtained when the film delay phase axis is arranged horizontally and vertically on a sample table is 0.1 or below in measurement to detect a scattered light intensity at the position of 95 to 165 degrees from a light source.

Description

technical field [0001] The invention relates to a phase difference film used for a liquid crystal display device, in particular to a phase difference film with excellent front contrast. Background technique [0002] Cellulose ester films, polycarbonate films, polycycloolefin films, and the like are often used as retardation films used in liquid crystal display devices. [0003] For retardation films, not only high optical transparency but also low birefringence are required. In recent years, liquid crystal display devices have been greatly developed in size and brightness, and along with this development, there have been more stringent requirements for improving the front contrast than before. [0004] In order to improve the front contrast, research on improving the transmittance of each component constituting the liquid crystal display device is continuing, and the retardation film provided on the liquid crystal cell (cell) side of the polarizing plate is no exception. R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C08J5/18
CPCC08J5/18C08J2301/14C08L1/14G02B7/003G02B5/3083
Inventor 高木隆裕
Owner KONICA MINOLTA OPTO
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