I. Introduction
The flat panel display (FPD) was very successful for TV market and has changed the display world. Moreover, FPDs are becoming much thinner and larger and will resemble a big window [1] in a paper thickness. This kind of display will no longer be a traditional “information display” like TVs, but a totally new “ambient display”. Recently, this “ambient display” has become a very attractive candidate for future display systems. An ambient display provides a virtual environment by displaying human size (or real size) images. With this ambient displays and high speed network system, two different places can be connected and people can communicate together in a visual space with a real size picture that helps them share information directly and participate in a co-shared environment. Also, this kind of display will be used as an image-wallpaper that displays not only information but also beautiful landscape. It looks like a typical window anywhere.