  Optical see-through head-mounted displays (OST HMDs) are a popular output
medium for mobile Augmented Reality (AR) applications. To date, they lack
efficient text entry techniques. Smartphones are a major text entry medium in
mobile contexts but attentional demands can contribute to accidents while
typing on the go. Mobile multi-display ecologies, such as combined OST
HMD-smartphone systems, promise performance and situation awareness benefits
over single-device use. We study the joint performance of text entry on mobile
phones with text output on optical see-through head-mounted displays. A series
of five experiments with a total of 86 participants indicate that, as of today,
the challenges in such a joint interactive system outweigh the potential
benefits.
