Optical laminate and image display device in which said optical laminate is used

A technology of optical laminates and protective layers, which is applied in optics, optical components, nonlinear optics, etc., can solve problems such as deviations in optical characteristics, and achieve the effects of excellent display characteristics and excellent anti-reflection functions

Active Publication Date: 2018-09-28
MITSUBISHI CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the viewpoint of thinning the display device, it is desirable to directly form the transparent conductive layer on the retardation film. The characteristics will deviate greatly from the expected characteristics, so the substrate for sputtering has to be used

Method used

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  • Optical laminate and image display device in which said optical laminate is used
  • Optical laminate and image display device in which said optical laminate is used
  • Optical laminate and image display device in which said optical laminate is used

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0138] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples. In addition, the measurement method of each characteristic is as follows.

[0139] (1) Thickness

[0140] The conductive layer was measured by an interference film thickness measurement method using MCPD2000 manufactured by Otsuka Electronics. For other films, measurement was performed using a digital micrometer (KC-351C manufactured by Anritsu Corporation).

[0141] (2) The phase difference value of the phase difference layer

[0142] The refractive indices nx, ny, and nz of the retardation layer (retardation film) used in Examples and Comparative Examples were measured with an automatic birefringence measurement device (manufactured by Oji Scientific Instruments, Ltd., automatic birefringence meter KOBRA-WPR). . The measurement wavelength of the in-plane retardation Re was 450 nm and 550 nm, the measurement wavelength of the thickness direction...

Synthetic example 1

[0163] [Synthesis Example 1] Synthesis of bis[9-(2-phenoxycarbonylethyl)fluoren-9-yl]methane (BPFM)

[0164] Synthesis was carried out by the method described in JP 2015-25111.

Synthetic example 26

[0165] [Synthesis Example 2] Synthesis of 6,6'-dihydroxy-3,3,3',3'-tetramethyl-1,1'-spirobiindane (SBI)

[0166] Synthesis was carried out by the method described in JP 2014-114281.

[0167] [Synthesis example and characteristic evaluation of polycarbonate resin]

[0168] The abbreviations and the like of the compounds used in the following Examples and Comparative Examples are as follows.

[0169] BPFM: bis[9-(2-phenoxycarbonylethyl)fluoren-9-yl]methane

[0170] ・BCF: 9,9-bis(4-hydroxy-3-methylphenyl)fluorene (manufactured by Osaka Gas Chemicals Co., Ltd.)

[0171] ・BHEPF: 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene (manufactured by Osaka Gas Chemicals Co., Ltd.)

[0172] · ISB: Isosorbide (manufactured by Roquette Freres, trade name: POLYSORB)

[0173] SBI: 6,6'-dihydroxy-3,3,3',3'-tetramethyl-1,1'-spirobiindane

[0174] ・SPG: spiroglycol (manufactured by Mitsubishi Gas Chemical Co., Ltd.)

[0175] ・PEG: polyethylene glycol number average molecular weight: 1000 (manufac...

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Abstract

Provided is an optical laminate in which an electrically conductive layer is formed directly on a phase difference layer, the optical laminate being very thin, having an exceptional reflection-preventing function, and furthermore being capable of exhibiting exceptional display characteristics even when applied to a curved part of an image display device. This optical laminate is provided with a polarizer, a phase difference layer bonded to the polarizer, and an electrically conductive layer formed directly on the phase difference layer. The phase difference layer has an in-plane phase difference Re(550) of 100-180 nm, and satisfies the relationship Re(450)<Re(550)<Re(650), the glass transition temperature (Tg) being 150DEGC or higher, and the absolute value of the photo-elastic coefficientbeing 20*10<-12>(m2 / N) or lower. The angle formed by the slow axis of the phase difference layer and the absorption axis of the polarizer is 35-55DEG.

Description

technical field [0001] The present invention relates to an optical laminate and an image display device using the optical laminate. Background technique [0002] In recent years, smart devices represented by smartphones, and display devices such as digital signage and window displays are increasingly used under strong external light. Along with this, problems such as reflection of external light and reflection of the background by reflectors such as the display device itself or a touch panel portion, a glass substrate, and metal wiring used in the display device arise. In particular, organic electroluminescence (EL) display devices that have been put into practical use in recent years have problems such as reflection of external light and reflection of the background because they have a highly reflective metal layer. Therefore, there is known a method of preventing these problems by providing a circular polarizing plate having a retardation film (typically, a λ / 4 plate) on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B7/02
CPCC08G63/64G02B1/111G02B5/3033G02B5/3083G02F1/133541G02F1/133638B32B7/12B32B23/08B32B27/08B32B27/306B32B27/365B32B2307/202B32B2255/10B32B2307/412B32B2307/42G02B5/305G02F1/13338B32B7/023B32B2457/206B32B2457/202C09K2323/03C09K2323/04C09K2323/031B32B2457/20
Inventor 角村浩清水享并木慎悟平见优一
Owner MITSUBISHI CHEM CORP
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