Controlling pre-tilt angles of liquid crystal using mixed polyimide alignment layer.
Three approaches to controlling liquid crystal (LC) pre-tilt angle in a cell are demonstrated using a polyimide (PI) alignment layer on substrates, in the form of a mixture of horizontal (H) and vertical (V) polyimides. The concentration ratio of H- to V-PI, baking temperature, and rubbing strength influence the pre-tilt angle, and highlight parameters for controlling the pre-tilt angle of an LC cell. Finally, a variable polarization converter is demonstrated using this approach.
Wu
Wei-Yen
WY
Department of Physics, National Cheng Kung University, Tainan, Taiwan 701, Republic of China.
Wang
Chen-Chen
CC
Fuh
Andy Y
AY
D003626:Data Display; D008027:Light; D008029:Lighting / Q000379:methods*; D050866:Liquid Crystals / Q000737:chemistry*; D008968:Molecular Conformation; D012031:Refractometry / Q000379:methods*; D012117:Resins, Synthetic / Q000737:chemistry*; D012542:Scattering, Radiation
D012117:Resins, Synthetic; C029945:polyimide resin