System for disposing a proximity sensitive touchpad behind a mobile phone keypad
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United States of America Patent
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Dec 19, 2006
Grant Date -
Feb 6, 2003
app pub date -
Jun 6, 2002
filing date -
Jun 22, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A proximity-based mutually capacitance-sensitive touchpad that is disposed directly beneath a keypad keymat of a mobile telephone, wherein posts associated with each key pass through a mutually capacitance-sensitive sensor electrode grid of the touchpad such that the keypad posts do not interfere with touchpad detection and tracking of a pointing object that moves along the keypad surface, to thereby enable touchpad data entry, cursor control, and scroll bar control on a display of the mobile telephone, wherein the keypad posts actuate mechanical switches underneath the touchpad.
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