Seock-Cheon Song

4.2: Development of a Novel Transflective Color LTPS-LCD with Cap-Divided VA-Mode

A novel transflective VA-mode to realize the good display performance was developed. In order to drive both transmissive and reflective modes simultaneously without any modulation of gamma in a single-gap structure, we have introduced a new design concept into the reflective region of each pixel, where the capacitance is separated into liquid crystal(CLC) and organic layer(COL), playing a key role as a voltage divider in our cap-divided VA-mode. With this single-gamma driving method, quite suitable for practical application to the mobile multimedia system due to its merits of simplifying processes and good legibility, we have achieved good optical characteristics such as high contrast ratio and wide viewing angle in a single-gap homeotropic panel design.

28.3: World's Largest (21.3 in.) UXGA Non‐Laser LTPS AMLCD

We have successfully demonstrated a 21.3-inch UXGA (1600 × RGB × 1200) LTPS AMLCD manufactured by non-laser crystallization method. The gate and data drivers were made of CMOS TFTs. Gate-driver circuits composed of shift registers and buffer circuits were integrated on both sides of panel for dual driving method and the multiplexing circuit was implemented on its data circuits. The non-laser technique such as nanocap-assisted crystallization is promising for low-cost LTPS on glass, compared to conventional laser annealing process.