Polarizing plate and organic electroluminescent display device

By designing a polarizer that directly contacts the optical anisotropic layer, controlling the content of dichroic materials and the matching of refractive indices, and optimizing the twisted orientation of liquid crystal compounds, the problem of insufficient black density in organic electroluminescent display devices under high-temperature environments is solved, thus improving display quality.

CN121559660APending Publication Date: 2026-02-24FUJIFILM CORP
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Patent Information

Application Number
CN202511845308.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2020-09-09
Filing Date
2021-08-23
Publication Date
2026-02-24

AI Technical Summary

Technical Problem

In the prior art, when an organic electroluminescent display device is exposed to a high-temperature environment for a long time, the black density of the polarizer on the front side is insufficient, which cannot meet the requirements for high-quality display.

Method used

The structure employs a polarizer in direct contact with the optical anisotropic layer. The content of dichroic material in the polarizer is controlled below 40% by mass. The refractive index of the polarizer and the optical anisotropic layer are matched. The optical performance is optimized by adjusting the twist angle and layer thickness of the twisted liquid crystal compound.

Benefits of technology

In high-temperature environments, the polarizer maintains excellent black density in the front direction, suppresses light reflection, and improves the image quality of organic electroluminescent display devices.

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Abstract

Provided are a polarizing plate and an organic EL display device which have excellent black compactness in the front direction even after an organic EL display device obtained by being affixed to an organic EL display panel is exposed to a high-temperature environment for a long period of time. This polarizing plate is provided with: a polarizer formed using a composition containing a first liquid crystal compound and a dichroic substance; and an optically anisotropic layer disposed adjacent to the polarizer and formed using a composition containing a second liquid crystal compound, in which the dichroic substance content in the polarizer is 40 mass% or less relative to the total mass of the polarizer.
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