Optical compensation layer for polarizing plate

JP7872333B2Active Publication Date: 2026-06-09NITTO DENKO CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
NITTO DENKO CORP
Filing Date
2024-11-20
Publication Date
2026-06-09

AI Technical Summary

Benefits of technology

【0006】 本発明によれば、光学補償層付偏光板において、nx>nz>nyまたはnx=nz>nyの屈折率特性を示し、所定の面内位相差を有し、フラット分散特性を示す第1の光学補償層と、nx>ny=nzの屈折率特性を示し、所定の面内位相差を有し、Re(550)>Re(450)を満たす第2の光学補償層とを偏光子側からこの順に配置することにより、正面方向の優れた反射防止特性を維持しつつ、斜め方向の反射防止特性にも優れ、かつ、斜め方向の色相がニュートラルである光学補償層付偏光板を得ることができる。

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Abstract

To provide a polarizing plate having an optical compensation layer excellent in antireflection properties in an oblique direction while maintaining excellent antireflection properties in a front direction, as well as having a neutral hue in the oblique direction.SOLUTION: A polarizing plate having an optical compensation layer is used for an organic EL panel. The polarizing plate having an optical compensation layer includes a polarizer, a first optical compensation layer and a second optical compensation layer in this order. The first optical compensation layer exhibits a refractive index characteristic of nx≥nz>ny, with Re(550) of 90-180 nm. The second optical compensation layer exhibits a refractive index characteristic of nx>ny=nz, with Re(550) of 100-180 nm. In the first optical compensation layer, Re(450) and Re(550) are substantially the same. The second optical compensation layer satisfies Re(450)>Re(550).SELECTED DRAWING: Figure 1
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Claims

1. The polarizer, the first optical compensation layer, and the second optical compensation layer are provided in this order. The first optical compensation layer exhibits a refractive index characteristic nx≧nz>ny, Re(550) is 90nm~180nm, the Nz coefficient is 0~0.8, and the angle between the absorption axis direction of the polarizer and the slow axis direction of the first optical compensation layer is 0°±10°. The second optical compensation layer exhibits a refractive index characteristic nx > ny = nz, Re(550) is 100 nm to 180 nm, and the angle between the absorption axis direction of the polarizer and the slow axis direction of the second optical compensation layer is 35° to 55°. The Re(450) / Re(550) ratio of the first optical compensation layer is 0.99 to 1.03, and the second optical compensation layer satisfies Re(550) > Re(450). Polarizing plate with optical compensation layer: Here, Re(450) and Re(550) represent the in-plane phase differences measured with light at wavelengths of 450 nm and 550 nm at 23°C, respectively.

2. The polarizer, the first optical compensation layer, and the second optical compensation layer are provided in this order. The first optical compensation layer exhibits a refractive index characteristic nx > nz > ny, Re(550) is 90 nm to 170 nm, the Nz coefficient is 0.1 to 0.5, and the angle between the absorption axis direction of the polarizer and the slow axis direction of the first optical compensation layer is 5° to 25°. The second optical compensation layer exhibits a refractive index characteristic nx > ny = nz, Re(550) is 60 nm to 140 nm, and the angle between the absorption axis direction of the polarizer and the slow axis direction of the second optical compensation layer is 50° to 70°. The Re(450) / Re(550) ratio of the first optical compensation layer is 0.99 to 1.03, and the second optical compensation layer satisfies Re(550) > Re(450). Polarizing plate with optical compensation layer: Here, Re(450) and Re(550) represent the in-plane phase differences measured with light at wavelengths of 450 nm and 550 nm at 23°C, respectively.