Pen-based interaction is an attractive user-computer interface paradigm. With the advances in hardware technology, off-the-desktop computing in the forms of handheld devices and tablets has made pen-based interfaces increasingly more relevant to mainstream applications. Pen-based interfaces are designed on the Pen-Paper metaphor which is analogous to the user's real working environment, it is natural for people, especially fit for the handwritings. Pen-Paper metaphor is a universal and fundamental way for capturing daily experience, communicating ideas, recording important events, conducting deep thinking and visual descriptions. Pen-based devices (e.g., PDAs and Tablet PCs) are featured with digital pens and touch screens. Digital pens inherit properties of real pens and are endowed digital with digital characteristics (e.g., pressure and orientation input modalities), which significant extends functions of digital pens.

Our researches include the fundamental studies on multiple input modalities of pen and the revelent interaction techniques. We also develop applications that reflect the characteristics of pens by incorparating many pen-based techniques.