Kyeong Jin Kim

Effects of carbon nanotubes on electro-optical characteristics of liquid crystal cell driven by in-plane field

Homogeneously aligned nematic liquid crystal (LC) cells doped with carbon nanotubes (CNTs) driven by an in-plane field were fabricated and their electro-optic characteristics were investigated. The effective cell retardation values showed no difference between doped and undoped LC cells in the absence of electric field. However, in the presence of electric field, it was smaller in the CNT-doped cell than in the undoped cell, resulting in the decrease of transmittance. Furthermore, the CNT-doped cell exhibited a slight increase in the driving voltage due to the increase of the twist elastic constant (K22) and the decrease in the decay response time due to the decrease in the rotational viscosity (γ) and γ∕K22 compared to the undoped cell.

21.1: New Structure of IPS Mode with In-Cell Retarder for TV Application

We have developed a new structure for True wide In-cell IPS (Twin IPS) panel which consists of a positive C plate in the cell. This positive C plate is made of a UV polymerizable Liquid Crystal on the color filter substrate as a retardation film. TWin IPS of 20.1′ VGA has improved diagonal viewing performance without any additional layer in the cell.

A New Optical Film with Antismudge Function and High Durability

We describe a new surface treatment to obtain optical films for liquid crystal display (LCD) applications. The films consist of a phase-separated layer including a fluorine-containing (FC) compound and a widely used polymer resin for providing a hard coating after surface treatment of the optical film. The major features of the resulting configuration are high durability with a good hardness of above 4H and a surface that allows oily contaminants such as ink and fingerprints to be easily removed by gentle dry wiping, owing to the antismudge function of the FC compound with a low surface energy.

Novel pad structures for the improvement of wire bonding strength in DXD panel

Abstract New pad structures are suggested to improve the wire bonding strength in the TFT panels suitable for the flat panel X-ray detector application. Several candidates of bonding pad structure are tested and one of them is chosen which shows the strongest and the most stable bonding with aluminum wire. Some morphological consideration was adopted to the surface of AlNd (Nd 2 at.%) pads whose thickness are 4000 A. To avoid the defect of signal lines such as hillocks due to increased thickness of AlNd, we selectively increased the thickness of AlNd on the bonding area only.