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Phase difference film, polarizing plate using such phase difference film, and image display device

A phase difference film and phase difference technology, which is applied in the field of circular polarizers and image display devices, and can solve problems such as insufficient wavelength dispersion

Active Publication Date: 2016-01-06
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, when the films described in Patent Document 2 and Patent Document 3 are used for light reflection prevention of an organic EL display, the wavelength dispersibility is insufficient.

Method used

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  • Phase difference film, polarizing plate using such phase difference film, and image display device
  • Phase difference film, polarizing plate using such phase difference film, and image display device
  • Phase difference film, polarizing plate using such phase difference film, and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0353]

[0354] (Preparation of fine particle dispersion)

[0355] Microparticles (Aerosil R812 Japan Aerosil Co., Ltd.) 11 parts by mass

[0356] 89 parts by mass of ethanol

[0357] The above substances were stirred and mixed with a dissolver for 50 minutes, and then dispersed using a Mantongorin disperser to prepare a fine particle dispersion.

[0358] (Preparation of microparticle additive solution)

[0359] 50 parts by mass of dichloromethane was placed in a dissolution tank, and 50 parts by mass of the fine particle dispersion liquid prepared above was slowly added while stirring the dichloromethane sufficiently. Furthermore, dispersion is performed with an attritor so that the particle size of the secondary particles becomes approximately 0.01 μm to 1.0 μm. This was filtered with Fine Met NF manufactured by Nippon Seisen Co., Ltd. to prepare a microparticle-added solution.

[0360] (preparation of mucilage)

[0361] First, methylene chloride and ethanol were adde...

Embodiment 2～10 and comparative example 1～4

[0370]

[0371] Retardation films 2-14 were produced by the method similar to retardation film 1 except having selected resin components and additives according to Table 1.

[0372]

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PUM

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Abstract

One embodiment of the present invention is a phase difference film in which: included are a cellulose ether derivative and a compound having a negative intrinsic birefringence; transmittance is at least 89% in a wavelength of 320nm-400nm; an in-plane phase difference Ro550 is 115nm-160nm in a wavelength of 550nm; and the ratio (Ro450 / Ro550) of an in-plane phase difference Ro450 in a wavelength of 450nm to Ro550 is 0.72-0.94.

Description

technical field [0001] The present invention relates to a retardation film, a circular polarizing plate and an image display device using the retardation film. Background technique [0002] In recent years, there have been various displays such as smartphones, flat panel displays, and organic EL displays. Since these displays are used in a variety of ways, the requirements for protective films and retardation films constituting the displays are also diverse. [0003] In addition, conventional liquid crystal display devices are mainly used for viewing images indoors, but smartphones and flat panel displays are often used not only indoors but also outdoors. Therefore, it is required that the retardation film used in these devices does not cause deterioration, bleeding, or fluctuation in optical value even if it is exposed to a harsher environment than before. In particular, organic EL displays are required not only for viewing indoors and outdoors but also for flexible displ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30H01L51/50H05B33/02
CPCG02B5/3083G02F1/13363G02F1/133637
Inventor 木暮翠中泽幸仁谷原范江三岛贤治李理英子田代耕二
Owner KONICA MINOLTA INC