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Circularly polarizing plate

a technology of polarizing plate and polarizing plate, applied in the direction of film/foil adhesives without carriers, film/foil adhesives, instruments, etc., can solve the problems of ambient light reflection or background reflection, wiring, and the inability to obtain excellent reflection hue, so as to prevent a reduction in brightness of brightness, widen the color gamut of image display apparatus, and excellent anti-reflection characteristics

Inactive Publication Date: 2020-11-12
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution provides a circularly polarizing plate with improved antireflection characteristics, neutral reflection hues, and the ability to widen the color gamut of image display apparatuses without significant brightness reduction, achieved at a lower cost compared to high-cost technologies like organic EL or quantum dot technologies.

Problems solved by technology

Along with the increase, a problem, such as ambient light reflection or background reflection, due to the display apparatus itself or a reflector used in the display apparatus, such as a touch panel portion, a glass substrate, or metal wiring, has been occurring.
When a circularly polarizing plate including a retardation film having such flat wavelength dispersion characteristic is used in a display apparatus, a problem in that an excellent reflection hue is not obtained occurs.
However, the use of the retardation film having a reverse wavelength dispersion characteristic is disadvantageous in terms of cost.
In addition, when the film is applied to a reflector having a high reflectance, a problem in that it is particularly difficult to adjust the hue of the reflector occurs.

Method used

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Examples

Experimental program
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Effect test

example 1

(i) Production of Retardation Layer (λ / 4 Plate)

[0114]Polymerization was performed by using a batch polymerization apparatus formed of two vertical reactors each including a stirring blade and a reflux condenser controlled to 100° C. 9,9-[4-(2-Hydroxyethoxy)phenyl]fluorene (BHEPF), isosorbide (ISB), diethylene glycol (DEG), diphenyl carbonate (DPC), and magnesium acetate tetrahydrate were loaded into a first reactor so that a molar ratio “BHEPF / ISB / DEG / DPC / magnesium acetate” became 0.348 / 0.490 / 0.162 / 1.005 / 1.00×10−5. After air in the reactor had been sufficiently purged with nitrogen (oxygen concentration: from 0.0005 vol % to 0.001 vol %), a temperature in the reactor was warmed with a heating medium, and stirring was started at the time point when the internal temperature became 100° C. 40 Minutes after the start of the temperature increase, the internal temperature was caused to reach 220° C., and such control that the temperature was held was performed. Simultaneously with the con...

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Abstract

Provided is a circularly polarizing plate that is excellent in antireflection characteristic, and that can be produced at low cost. The circularly polarizing plate of the present invention includes in the stated order: a polarizer; a retardation layer (20a) configured to function as a λ / 4 plate; and a colored layer, wherein an angle formed by an absorption axis of the polarizer and a slow axis of the retardation layer (20a) is from 35° to 55°, wherein the colored layer has an absorption peak in a wavelength band in a range of from 580 nm to 610 nm, and wherein the colored layer contains a compound X represented by the general formula (I) or the general formula (II).

Description

TECHNICAL FIELD[0001]The present invention related to a circularly polarizing plate.BACKGROUND ART[0002]In recent years, the number of opportunities for a smart device typified by a smartphone and a display apparatus, such as a digital signage or a window display, to be used under strong ambient light has been increasing. Along with the increase, a problem, such as ambient light reflection or background reflection, due to the display apparatus itself or a reflector used in the display apparatus, such as a touch panel portion, a glass substrate, or metal wiring, has been occurring. In view of the foregoing, it has been known that such phenomenon is prevented by arranging a circularly polarizing plate including a λ / 4 plate on the viewer side of the apparatus. A circularly polarizing plate obtained as described below has been known as a general circularly polarizing plate. A retardation film (typically a λ / 4 plate) typified by a cycloolefin (COP)-based resin film is laminated so that i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02F1/1335G02F1/13363H10K99/00
CPCG02F1/133536G02F2202/28G02F2001/133638G02F2001/133541G02F1/133634G02F1/133533C07D207/44C07D209/12C07D209/44C07D209/52C07D209/60C09K11/06C09B57/007G02B5/223H10K77/00C07D403/08G02F1/133509G02F1/133528H01L33/50G02F1/133541G02F1/133638C09K2323/031C09K2323/03C07D207/00C07D209/00C07D403/00C09J7/385C09J7/10C09J2301/408C09J2301/302C09J11/06C09J2203/318C09J2429/008C09J2433/00C09J7/20C09J2301/312G02F1/133302G02B1/10
Inventor NAKAMURA, KOZOWANG, PENGWELCH, MICHAELZHENG, SHIJUN
Owner NITTO DENKO CORP
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