Method for improving reliability of phase delay film and phase delay film

By modifying the surface of the phase retardation film to form a hydrophobic layer, the stability problem of the phase retardation film under high temperature and high humidity conditions was solved, and the long-term optical and mechanical stability of the film was improved.

CN121801140APending Publication Date: 2026-04-07SHAANXI MINGWEI CAIGUANG NEW MATERIAL TECHNOLOGY CO LTD +1
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Patent Information

Application Number
CN202511814370.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-04
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

Traditional phase retardation films exhibit phase retardation drift, increased haze, and surface physical degradation in high-temperature and high-humidity environments. Existing modification methods may increase costs or affect optical performance.

Method used

The surface of the phase retardation film is modified with sulfur-containing alkyl chain compounds to form a hydrophobic layer. Through thermal reaction, it forms stable chemical bonds with the polymer film material, thereby enhancing the film's resistance to water vapor and heat.

Benefits of technology

It significantly reduces water vapor permeation rate, decreases the thermal motion of polymer molecular chains, suppresses phase retardation value drift and haze increase, and improves the long-term optical and mechanical stability of phase retardation films under high temperature and high humidity environments.

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Abstract

The invention discloses a method for improving the reliability of a phase delay film and the phase delay film, and belongs to the technical field of optics. According to the invention, the sulfur-sulfur alkyl chain-containing compound is adopted to perform molecular modification on the phase delay film, so that the adsorption and invasion rate of the phase delay film to water molecules can be reduced, and polymer swelling, plasticizing and hydrolysis effects caused by water vapor can be reduced; thermal motion of a polymer molecular chain in a high-humidity and high-temperature environment is inhibited, internal stress release and microstructure change are reduced, and then the problems of phase delay value drift, haze rising and surface physical degradation of the phase delay film in the high-humidity and high-temperature environment are solved; and the optical stability and the mechanical stability of the phase delay film in a high-humidity and high-temperature environment are improved.
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