We propose and investigate obtaining high pretilt nematic alignment using a new photoalignment method: single oblique polarized ultraviolet (UV) light irradiation on polyimide (PI) surfaces. It was found that the monodomain alignment in a nematic liquid crystal (NLC) is obtained with PI surfaces having side chains. We successfully observed that the generated high pretilt angles of the NLC are about 6 with an angle of incidence of 5 80 on the PI surface. Also, the generated pretilt angle of NLC is about 6 with an UV light irradiation of 30 min for angle of incidence of 5, and decreases with increasing UV light irradiation time. High pretilt orientation of the NLC is successfully observed in cells with a single oblique UV light irradiation on PI surfaces.
Bibliographical noteFunding Information:
The autorhs wish taocknowledge H. Fukuro and Nisasn Chemicl IandustiesrCo.L,tfdor providing PI matriaels. This research was supporteindpart by a Grant ofDeelvpomnt ofeAdvanceTdecnohlogies for Flat Panel Dipslyas oftehMinisty rofScinece and Tecnohlogy and Ministy rof Trade, Industy rand Energy of Korea. This research was also supporteindpart by a grant from SoongsiUlniversiy.t
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics