Currently, smart phone and table pc like I phone and I pad with touch pad are main trend in the mobile market. Using touch pad, display image is distorted by external pressure with touch pen and fingers. Because such defects, improvement of pressure resistant characteristic by external pressure (Trace mura) is became more important factor. To solve the problem, we studied pressure resistant characteristic by rubbing uniformity, alignment anchoring force, rotational viscosity of liquid crystal and pixel electrode length of domain structure. Through these experiment results, we have found the design of improving pressure resistant characteristic (Trace mura). Low rotational viscosity of liquid crystal shows stronger pressure resistant characteristic than high rotational viscosity of liquid crystal and as the length of pixel electrode is shorter, pressure resistant characteristic (Trace mura) is good. It is much advantageous for touch pad display field.

Small sized TFT‐panel such as mobile & application product have different mura phenomenon comparing large‐Sized TFT‐panel in ODF(one drop filling) process. Unlike large‐Sized TFT‐panel, for small sized TFT‐panel, push mura and bubble is more serious than gravity mura because portable devices such as mobile & application are sensitive to external shocks. We have developed 1.8”, 2.0” and 2.4” TFT‐panel in ODF process. Through these TFT‐panels, we have developed the PS(post spacer)design rule, process margin and method of material developments that reflect correlation with push mura, bubble and side mura. Through these rules, we suggest PS design rule, process rule and material development in order to optimize mobile & application ODF panel.