A polymer-dispersed liquid crystal confined in a 90° twisted cell ~T-PDLC! is demonstrated. In comparison to a conventional PDLC, the T-PDLC is also polarization independent while exhibiting a higher contrast ratio. Potential applications of the T-PDLC are in polarizer-free reflective display and light switch. A black and white segmented-alphabet reflective display using a dye-doped T-PDLC is d...

A series of polymer dispersed liquid crystal devices using glass substrates have been fabricated and investigated focusing on their electrical properties. The devices have been studied in terms of impedance as a function of frequency. An electric equivalent circuit has been proposed, including the influence of the temperature on the elements into it. In addition, a relevant effect of temperatur...

The observation of spatial angle dependent lasing from a dye-doped two-dimensional photonic crystal (2D PC) holographic polymer dispersed liquid crystals made of hexagonal lattice structure is reported. With the increasing output angle of the laser beam in the plane perpendicular to the 2D PC, the lasing wavelength is red-shifted. By analyzing the lasing oscillation trace, we found that the eff...

An electrically tunable Fresnel zone plate lens is demonstrated using nanoscale polymer-dispersed liquid crystal droplets. In the voltage-off state, the zone plate behaves like a positive lens. The measured diffraction efficiency is close to the theoretical limit and is controllable by voltage. The major advantages of such a Fresnel lens are simple fabrication, large aperture size, polarization...

We report strong diffraction of cold neutrons from an only 30 micro m thick holographic polymer-dispersed liquid crystal (H-PDLC) transmission grating. The light-induced refractive-index modulation for neutrons is about 10(-6), i.e., nearly 2 orders of magnitude larger than in the best photo-neutron-refractive materials probed up to now. This makes H-PDLCs a promising candidate for fabricating ...

Polymer dispersed liquid crystals (PDLC) are a well established technology for electrooptic devices used in displays and light switches. They rely on dispersions of nematic liquid crystal material in a polymer matrix. In the absence of an electric field, the director field n(r), which characterizes the local average orientation of the rodlike nematic mesogens, is randomly oriented, leading to a...

A new liquid-crystal device for flexible display applications was developed using twofold polymerization process. The cell was fabricated from a homogeneous mixture of a liquid crystal and a polymerforming material. Caused by the spatially nonuniform rate of polymerization and wetting properties, largescale anisotropic phase separation of the liquid-crystal blend and the polymer precursor leads...

This study demonstrates a light field display system using nematic liquid crystal (LC) microlens array (MLA) and polymer dispersed (PDLC) film. LC-MLA without polarization effects presented high-resolution intermediate 3D images by adopting depolarization algorithm. The adopted PDLC film modulated the reconstructed to deliver full-parallax efficiently with wide FOV. experimental result shows th...

(1 of 6) 1600668 polymer dispersed liquid crystal (PDLC) films stand out due to their ability to be switched from an opaque to a transparent state with the applied external electric field without the need for polarizers. Since its discovery,[13] researchers have extensively explored the potential applications of PDLCs in the areas of flat panel displays,[14] smart windows,[15,16] microlens,[17]...

We report holographic polymer-dispersed liquid crystal (H-PDLC) gratings driven by surface acoustic waves (SAWs). Our experiments show that upon applying SAWs, the H-PDLC grating exhibited switchable properties: The diffraction of the H-PDLC grating decreased, whereas the transmission increased. This acoustically switchable behavior is due to the acoustic streaming-induced realignment of liquid...