Photoalignment and photopatterning has been proposed and studied for a long time. Light is responsible for the delivery of energy as well as phase and polarization information to materials systems. It was shown that photoalignment azodye materials could provide high quality alignment of molecules in a liquid crystal (LC) cell by nanolayers from 1 to 20 nm. Over the past years, a lot of improvements and variations of the photoalignment and photopatterning technology has been made for display and photonics applications. In particular, the application of this technology to active optical elements in optical signal processing and communications is currently a hot topic in photonics research.
Photoaligned optically rewritable (ORW) liquid crystal based on azodye nanolayers is made to write, store and rewrite again the information generated by computer on a glass or flexible carrier. Optically rewritable technique is highly desirable, as e-paper displays suffer from the high level complexity of driving electronic due to the insufficient durability of flexible conductor and contact bonding. The optical security film with high security features by using azodye photo-alignment technology were also implemented. Azodye photo-alignment, which is a new technology for aligning liquid crystal, is being used to produce a flexible and highly recognized security film.