High contrast ratio and fast response ferroelectric liquid crystal displays based on alignment optimization

There are a series of polyimide material synthesized and studied with different dianhydride and diamine structures. By exploring the structural variations of these materials and their surface energy characteristics, we successfully obtained ferroelectric liquid crystal devices exhibiting exceptional optical and electrical properties. Notably, our findings highlight that a specific polyimide material comprised of dianhydride with a benzene ring structure and diamine with a long-chain amino structure demonstrates remarkable achievements, including a maximum contrast of 872 and a rapid response speed of less than 0.1 ms. These results establish the superiority of this particular polyimide material over its commercially available counterparts. Additionally, the optical characteristics of various polyimide materials were examined by establishing a correlation between these properties and the surface energy of the materials. This research presents a novel approach to developing alignment materials suitable for ferroelectric liquid crystal applications. The implications of our findings are of great significance in driving advancements in field-sequential-color display devices with high pixels per inch in the ferroelectric liquid crystal field. The FLC cells containing optimized polyimide (PI) composed of dianhydride and diamine structural components exhibit outstanding optical contrast and response speed. [Display omitted] •Polyimide (PI) materials with different dianhydride and diamine structures have been synthesized and studied.•FLC devices based on optimized PI display excellent contrast ratio of 872 and a rapid response speed of less than 0.1 ms.•The optimized PI material has been successfully implemented in the LCD Generation 4.5 mass production line.