The 4th ACM SIGGRAPH Conference and Exhibition on Computer Graphics and Interactive Techniques in Asia
Conference 12-15 December • Exhibition 13-15 December • Hong Kong Convention & Exhibition Centre

Emerging Technologies

Polychrome Paper Computing

The concept of Polychrome Paper Computing is to enable dynamic color change on paper without losing thin soft character. Focusing on polychrome printing techniques used in traditional paper works such as ukiyo-e (a genre of Japanese woodblock prints) and calligraphy, we have developed a paper with dynamic color changes. By using this material, it becomes possible to generate interactive paper works that can utilize the expressions and techniques of paper. Polychrome Paper Computing is expected to be a new color-generating technology which connects paper and computing seamlessly. The color-change function controls the color of drawing objects by using liquid crystal ink which is made of microcapsules of liquid crystal with fascinating structural color. The show-hide function controls the visibility of drawing objects by using thermochromic ink. Like a polychrome, the circuit and heating part is printed on the back side, and on the adverse side, a decoration (outline of image) and a structure to produce the color is printed. For heating material, carbon heating paste and a medium for resist control are used. Silver paste is used for the electrode. Behind the drawing objects, capacitance sensor made by copper foil is placed. At the exhibition, users can enjoy the following three applications. Anabiosis is an interactive pictorial art, in which a user's touch gives the printed butterfly a color. By touching a butterfly on a piece of paper, this gives a feeling of resurrection - by imparting a life of human into a butterfly. Constellation is an interactive star atlas which provides two layered animation sequence. A color-change layer is printed on a show-hide layer. Two layers are implemented to be active at different temperature, which causes the animation sequence on real papers. Multi-narrative storytelling is a prototype of future picture books for children.

Kohei Tsuji, Keio University
Akira Wakita, Keio University