Two-Layer Photo-Alignment Film for Liquid Crystal Displays

The patent applies composite materials by combining photo-alignment film and charge removal film in a single alignment layer structure. The photo-alignment film provides LC alignment control through light irradiation, while the charge removal film simultaneously removes accumulated charges that cause afterimages. This composite structure resolves the contradiction by integrating both alignment functionality and charge removal capability, eliminating afterimages while maintaining alignment stability.

The patent replaces the mechanical rubbing method with a photo-alignment method that uses light irradiation instead of physical contact. This substitution eliminates the generation of static electricity during the alignment process, preventing thin-film transistor breakdown. The photo-alignment film achieves LC alignment control through photolytic action without mechanical friction, thereby removing the harmful static electricity effect while maintaining alignment stability.

The patent applies multi-functionality by designing the alignment film to perform multiple functions simultaneously: photo-alignment for LC orientation control and charge removal to prevent afterimages. The charge removal film component specifically addresses charge accumulation in thin-film transistor regions, enabling the alignment film to maintain effectiveness even in thinned structures. This universal design allows the alignment system to function properly regardless of film thickness variations.