Cyclic Olefin Copolymer Vertical Alignment Layer for Low-Temperature Liquid Crystal Orientation

The patent changes the chemical composition parameters of the alignment layer by using a cyclic olefin copolymer with specific functional groups (carboxylic acid, hydroxyl, or amine groups) instead of polyimide. This compositional parameter change enables the alignment layer to achieve effective liquid crystal alignment at lower temperatures (below 150°C) while maintaining alignment reliability, thus resolving the contradiction between alignment performance and temperature requirements for flexible displays

The patent employs a composite material approach by creating a copolymer structure that combines cyclic olefin backbone with functional groups capable of interacting with liquid crystal molecules. The specific copolymer structure (containing norbornene rings with pendant functional groups) provides both the mechanical properties needed for flexible substrates and the molecular interaction capabilities for effective alignment at low temperatures

The patent applies local quality by introducing specific functional groups (carboxylic acid, hydroxyl, or amine groups) at localized positions on the cyclic olefin copolymer chain. These functional groups are positioned as pendant groups on the polymer backbone, creating localized interaction sites that strongly interact with liquid crystal molecules. This localized functional group placement enables effective alignment without requiring high temperature processes across the entire material

The patent replaces the thermal mechanism (high temperature heat treatment) with a chemical mechanism (molecular interaction between functional groups and liquid crystal molecules). Instead of relying on thermal energy to achieve alignment, the functional groups on the copolymer directly interact with liquid crystal molecules through hydrogen bonding, dipole-dipole interactions, or other molecular forces, enabling alignment at lower temperatures