Fast response time of liquid crystal display modes using band separation UV exposure method

ABSTRACT

We propose a double frequency ultraviolet (UV) exposure process that can improve the surface anchoring energy of photopolyimide (PI) embedded with reactive mesogens (RMs) for the high speed liquid crystal modes. In experiment, we polymerize the RM materials using long wavelength UV light over 340 nm, and then accomplish the polymerization of the UV alignment layer using short UV light between 254 nm and 340 nm. As results, we demonstrate the improved surface anchoring energy and the fast response time of an in-plane switching (IPS) and a twisted nematic (TN) LC modes in this paper.

KEYWORDS:

• Surface anchoring energy
• in-plane switching
• twisted nematic
• reactive mesogen
• response time
• photoalignment

Funding

This work was supported by LG Display and the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2015R1D1A3A03020569).