Long-pitch cholesteric liquid crystal cell for switchable achromatic reflection.
We propose a switchable achromatic reflector using a long-pitch cholesteric liquid crystal (CLC) whose Bragg reflection wavelength is chosen to be infrared by controlling the pitch of the CLC so that the planar texture is transparent over the entire visible wavelength. By using the light scattering of the focal conic texture, achromatic reflection can be achieved. Both textures are stable at zero electric field and the operating voltage of the proposed CLC device is much lower than that of conventional CLC devices. The proposed switchable reflector, which can be operated at a low voltage with low power, can be applied to reflective displays and to light shutters. By coupling with a reflective polarizer the efficiency of light scattering at the focal conic texture can be enhanced.
Kim
Ki-Han
KH
School of Electrical Engineering, Pusan National University, Busan 609-735, Korea.
Jin
Hye-Jung
HJ
Park
Kyoung-Ho
KH
Lee
Joun-Ho
JH
Kim
Jae Chang
JC
Yoon
Tae-Hoon
TH
D003198:Computer Simulation; D004867:Equipment Design; D008027:Light; D050866:Liquid Crystals / Q000737:chemistry*; D012031:Refractometry / Q000295:instrumentation*