Samsung Electronics Co., Ltd.

Samsung Corning Precision Glass Co., Ltd.

Samsung Electron Devices Co., Ltd.

Cheil Synthetics Inc.

Seoung Jae Im

Tae Gon Kim

Young Sun Kim

Jae Ho Lee

Seok Hyun Nam

Dong Chin Lee

Kubota Shunichi

Dae H Lee

Disclosed herein is a method for preparing a nanophosphor from a metal hydroxy carbonate and a nanophosphor prepared by the method. The method is capable of mass-production of a uniform particle-size nanophosphor with superior dispersibility and enables reduction in preparation costs. The nanophosphor prepared by the disclosed method exhibits high luminescence efficiency.

Method for preparing nanophosphor from metal hydroxy carbonate and nanophosphor prepared by the method

Disclosed herein are a metal hydroxy carbonate nanoparticle-coated phosphor and a preparation method thereof. The phosphor coated with metal hydroxy carbonate nanoparticles exhibit improved thermal stability and an increased luminance lifespan, when applied to display devices, e.g., PDPs and lamps.

Metal hydroxy carbonate nanoparticle coated phosphor and method for preparing the same

The polymer dispersed liquid crystal according to the present invention comprises about 5 to about 40% by weight of liquid crystal mixture and about 60 to about 95% by weight of polymer, the polymer consisting of 1 to 40% by weight of oligomer and monomer having acrylate group(s), and 0.1 to 20% by weight of monomer of the following structural formula similar to the structure of the liquid crystal, and the liquid crystal mixture consisting of 0 to 20% by weight of cholesteric liquid crystal and 50 to 98% by weight of nematic liquid crystal as based on the total weight of the material. ##STR1## The polymer dispersed liquid crystal is capable of providing a wider viewing angle and an improved visual contrast and does not require treatment to orientation. Furthermore, the electrically switched liquid crystal display including it therein makes use of light more efficiently because polarizer is unnecessary any more, and may be produced by a simple process because no orientation (rubbing) treatment is required.

Polymer dispersed liquid crystal for wide viewing angle

A siloxane modified polyimide resin having high heat resistance and processability is prepared by reacting a siloxane diamine of formula (1) and an aromatic diamine of formula (2) with an aromatic tetracarboxylic dianhydride of formula (3) in a polar solvent. ##STR1## wherein, R represents ##STR2## R.sub.1 and R.sub.2 represent aromatic or aliphatic hydrocarbons; n represents an integer of 1 to 1000;

Preparation of siloxane modified polyimide resin

Growing community of inventors

Seoul, South Korea

Seoung Jae Im