Chong-Chul Chai

9.2: Implementation of RGBW Color System in TFT‐LCDs

Last year, we introduced a TFT-LCD with RGBW color system. The primary advantage of the RGBW system is that its optical efficiency is at least 50% higher than the RGB system. However, it is not a simple task to incorporate the new color system into the existing infrastructure of the RGB system: the driving circuitry, fabrication of color filter, and color conversion. In this report, the practical hurdles are discussed and the solutions are presented.

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.

P-119: A Novel Image Quality Improvement Technology by Charge Pumping Method

We propose a new LCD mode named as Charge-Pumped Super Patterned Vertical Alignment (CP S-PVA) which can utilize 1G-1D driving. In this mode, the voltage difference between two sub-pixels is controlled by a unique charge-pumped structure. This results in equal level of off-axis image quality and transmittance to TT S-PVA. Moreover, this new mode has good production yield and production margin. Operation schemes and display performance of CP S-PVA are presented.