Kyoung-Ju Shin

69.4: Amorphous Silicon Based 40″ LCD TV Using Ultra Fast OCB Mode

The worlds largest (40 inch) size a-Si TFT-LCD HDTV (1366 × 768) panels based on OCB (optically compensated bend) mode has been successfully developed using newly developed impulsive driving method, which shows the contrast ratio over 500, viewing angle over 160 degree for all direction, brightness over 600 cd/m2 and MPRT in the range of 7 ∼ 10ms. Especially, transmittance and viewing quality of the motion picture have been remarkably enhanced by gray impulsive driving (GID) method. We are now continuing further research in order to improve the contrast ratio and reliability for commercialization.

38.4L: Late‐News Paper: A New Vertical Alignment Mode for TFT‐LCDs

A simple and cost-effective vertical alignment mode, named Smart Viewing Angle(SVA) mode, for active-matrix (AM) LCDs was developed where all the domain dividers are fabricated only on the TFT substrate side. The crucial component is the director control electrode (DCE) under the openings of the pixel electrode. The DCE maintains higher voltage than that of the pixel electrode via additional TFTs, which distorts the electric field in such a way that stable domain division is accomplished. Compared to the conventional VA modes where the additional process is required, SVA mode can achieve the wide viewing angle without any additional processes.