Optical compensation layer for polarizing plate

JP7872334B2Active Publication Date: 2026-06-09NITTO DENKO CORP

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

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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の屈折率特性を示し、かつ、所定の面内位相差を有する第1の光学補償層と、nx>nz>nyの屈折率特性を示し、かつ、所定の面内位相差を有する第2の光学補償層とを偏光子側からこの順に配置し、かつ、第1の光学補償層および第2の光学補償層をいずれもフラット分散の位相差フィルムで構成することにより、安価で、かつ、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、さらに、斜め方向の色相がニュートラルである有機ELパネルを実現し得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 220-300 nm. The second optical compensation layer exhibits a refractive index characteristic of nx>nz>ny, with Re(550) of 90-170 nm. The first and second optical compensation layers have substantially the same Re(450) and 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 220 nm to 300 nm, the Nz coefficient is 0.4 to 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 5° to 25°. The second optical compensation layer exhibits a refractive index characteristic nx > nz > ny, Re(550) is 90 nm to 170 nm, the Nz coefficient is 0.4 to 0.8, and the angle between the absorption axis direction of the polarizer and the slow axis direction of the second optical compensation layer is 65° to 85°. The Re(450) / Re(550) ratio of the first optical compensation layer and the second optical compensation layer is 0.99 to 1.

03. 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 280 nm to 360 nm, the Nz coefficient is 0.5 to 0.9, 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 > nz > ny, Re(550) is 100 nm to 180 nm, the Nz coefficient is 0.2 to 0.6, 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 and the second optical compensation layer is 0.99 to 1.

03. 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.