A Method for Improving Handheld Device Capacitive Button Usability
Publication Date: 2004-Jan-08
The IP.com Prior Art Database
Field of Invention: Handheld devices using capacitive sensors. To avoid the potential confusion in this IDF, "button" or "button matrix" will refer to physical switches whereas "keypad" will refer to a capacitive sensor used in lieu of buttons. The use of a capacitive sensor to replace the buttons of a traditional mobile phone or other similar handheld device presents several usability challenges. Fundamentally, many of these devolve to deciding when the keypad should be active. The invention comprises activating the keypad when a button is pressed, a general-purpose keypad deactivation algorithm, and an indication when the keypad is active.