Grating-Type Soft-Focus Filter for Improving Picture Quality of Liquid Crystal Displays

Abstract

The temporal evolution of disorder around grain boundaries between domains of ideally six-fold coordinated two-dimensional foam has been studied experimentally, using a foam comprising bubbles bridging between a soap solution and a cover glass. The disorder, quantified by the second central moment of the distribution of topological classes of the cells (µ 2 ), generally increases. In certain cases, in which the evolution can be followed over longer times, µ 2 eventually falls. This may be connected with the transient peaks for µ 2 found in previous studies of relatively ordered soap froths. The absolute values of µ 2 depend upon the boundary conditions imposed upon the foam, a rigid wall leading to higher values than a deformable boundary. The disorder about the grain boundaries propagates into the adjacent regions of ordered foam with constant speed, the roughness of the interface increasing with time.

Twisted phase gratings induced by photoregulated mesogenic molecules on the surface of photoreactive polymer liquid crystal film

“…3,4 Liquid crystals ͑LCs͒ constitute a novel type of functionalized materials possessing exciting physical and chemical properties, 5 potentially leading to important technological applications such as polarization-sensitive optical devices. The molecules are selectively photoreacted only at the surface of the film under the polarization holographic illumination, and the resultant photocrosslinked mesogenic molecules induce the three-dimensional twisted gratings in the film during annealing process.…”

Light Wave Propagation and Bragg Diffraction in Thick Polarization Gratings

“…Diffractive optical devices are of great importance for realizing numerical optical functions such as optical memory devices, 1) integrated optical devices, 2) and thin-film optical filters. 3,4) It is possible to fabricate diffractive optical devices by exposing light-sensitive materials such as photopolymers to interference light. The resulting gratings can control the light propagation direction and can be used in optoelectronic equipments.…”

Diffraction Properties of Nematic Phase Gratings with Photoregulated Liquid Crystal Cells

“…Diffractive optical devices are of great importance in realizing numerical optical functions such as optical memory devices, 1) integrated optical devices, 2) and thin-film optical filters. 3,4) Liquid crystals (LCs) constitute a novel type of functionalized material possessing exciting physical and chemical properties 5) and potentially leading to important technological applications such as polarization-sensitive optical devices. If, instead of isotropic media such as glassy or polymeric materials, the nematic LC is used as the gratings, then the possibility of obtaining multifunctionalized optical devices arises.…”