Device physics and electro-optical properties of emerging polymer-stabilized blue-phase liquid crystal displays (BPLCDs)
are investigated. The novel protruded electrodes generate strong horizontal electric fields which penetrate deeply
into the bulk LC layer. As a result, the operating voltage is reduced from over 50V<sub>rms</sub> to ~10 V<sub>rms</sub>, which for the first time
enables the BP-LCDs to be addressed by amorphous silicon
thin-film-transistors (TFTs). Kerr constant effect from the
material side is also evaluated quantitatively. Widespread application of TFT BP-LCDs is foreseeable.
In this paper, we demonstrated a new dye-doped cholesteric liquid crystal (CLC) photonic band edge laser with
emission enhanced by an external cholesteric resonator. As one-dimensional photonic crystal, the 5-&mgr;m dye-doped
cholesteric liquid crystal cell generates circularly polarized laser emission at its photonic band edge. When
sandwiched between two 5-&mgr;m cholesteric liquid crystal mirrors whose reflection band reflects the laser emission
from the central dye-doped CLC laser, the emission can be enhanced by ~800X. In experiment, a second-harmonic
Q-switched Nd-YAG pulsed laser is used to pump the CLC laser assembly at normal incidence. The detected laser
emission is elliptically polarized and is still located at the band edge wavelength of the central CLC cell. The beam
divergence is decreased by ~10X due to an increased cavity length. Theoretical analysis using 4x4 transfer matrix
and scattering matrix has shown that the circular resonator produces transmission peaks based on Fabry-Perot effect
inside reflection band and, moreover, the transmission peak at the band edge of central CLC can be well-preserved.
Both experiment results and simulation results are present in good agreement.