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Updated: Apr 5, 2026

An Assessment Method and Toolkit to Evaluate Keyboard Design on Smartphones
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FanType: Intention-Inferring Fan-Shaped Thumb Interface for Text Entry on Small XR Keyboards.

Guanghan Zhao, Louis Teys, Gyeonghwan Yang

    IEEE Transactions on Visualization and Computer Graphics
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    Summary
    This summary is machine-generated.

    FanType offers efficient text entry for small virtual keyboards in extended reality (XR), mimicking smartphone typing. This novel technique reduces hand movement and improves accuracy for mobile XR users.

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    Area of Science:

    • Human-Computer Interaction
    • Virtual Reality
    • Augmented Reality

    Background:

    • Practical extended reality (XR) use often occurs in mobile, spatially constrained environments.
    • Large virtual keyboards are impractical in these contexts due to visual space occupation and interference with real/virtual content.

    Purpose of the Study:

    • To present FanType, a novel text entry technique for efficient typing on small virtual keyboards in XR.
    • To address the limitations of large virtual keyboards in mobile and constrained XR settings.

    Main Methods:

    • FanType utilizes a fan-shaped interface to group keys within thumb reach.
    • A lift-up gesture is employed for disambiguation, reducing hand movement and preserving typing speed.
    • An intention-inferring mechanism with tailored algorithms counterbalances touch bias for improved accuracy.

    Main Results:

    • User study evaluated FanType on tablet- and smartphone-size portrait keyboards.
    • Compared FanType against a touch-only baseline and a state-of-the-art mid-air technique.
    • Provided insights into the performance of FanType and challenges in designing small virtual keyboard typing methods.

    Conclusions:

    • FanType enables efficient text entry on small virtual keyboards in XR.
    • The technique shows promise for mobile and spatially constrained XR applications.
    • Further research is needed to address challenges in designing effective small virtual keyboard typing methods.