Kee-han Uh

24.3: Hybrid Touch Screen Panel Integrated in TFT‐LCD

It is, for the first time, presented that the touch panel function is fully integrated in 2.45 inch amorphous silicon QVGA TFT-LCD using liquid crystal capacitive line sensor arrays with the same fabrication process as TFT-LCD. It is capable of detecting touch event and finding touch positions by the capacitance change of liquid crystal in LCD. It demonstrates outstanding display qualities and superiority in size and thickness compared to conventional resistive touch screen panel.

35-1: Invited Paper: Advanced Technologies Based on a-Si or LTPS (Low Temperature Poly Si) TFT (Thin Film Transistor) for High Performance Mobile Display

The new technologies in mobile display developed in SEC are briefly reviewed. for a differentiation, SECs LTPS line is based on SLS (Sequential Lateral Solidification) technology. In this paper, the characteristics of SECs SLS in recent and future mobile displays were discussed. SLS has a strong point in productivity and higher performance but has a weak point in uniformity and property anisotropy. Uniformity could be improved by tilt engineering and property anisotropy by multichannel structure. By overcoming weaknesses, SLS could be basic crystallization technology for SECs LTPS mass production line. A-Si TFT technology is also important in low resolution display or mid to large size mobile applications due to its lower fabrication cost. SEC has developed successfully both a-Si and LTPS technologies as a portfolio. Cost-competitive a-Si base TFT-LCD could be developed using advanced technologies such as ASG (Amorphous Silicon Gate). For value-added functions, SEC has developed ADC(Automatic Dimming Control), h-TSP (Hybrid Touch Screen Panel) ADC can make low power consumption devices. H-TSP has two kinds of types and SEC has developed both successfully to the mass production level.

P‐145: New Configuration of Normally Black Transflective ECB LCD with Low Cost

The ECB LC Mode is generally normally white Mode and is used transflective Mode, By applying new configuration of LC, Film such as Polarizer, Retarder, We realized Normally black ECB transflective Mode which one configuration improve reflective property, the other configuration improve transmissive property such as Contrast Ratio. Finally, we acquired over 200:1 contrast Ratio, and 4% reflectance in condition of a diffusing light.