Abstract
Touch screen panel (TSP) technology has dramatically
enhanced the connectivity between man and machine, in particular within
mobile consumer electronics where mobility is a key design criterion.
This paper introduces a novel charge-sensing technique derived from
the behavioral characteristics of a mutual capacitive touch screen
panel. The approach is based on a reduced scan algorithm whereby both
the target and its surroundings form the node and the selection process
is conducted in two phases. In the first phase, the introduction of
a charge on the TSP is sensed, while the second phase evaluates when
the touch event occurs on the TSP. The proposed algorithm reduces
the number of sensing nodes activated during the waiting period by
observing the behavior of a single row within the charge sensing array,
as opposed to the more conventional approach in which all TSP nodes
are scanned. As a result, power consumption is reduced by 60% during
the sensing phase, while the dynamic sensing range is increased by
a factor of 38% for a complete two-stage sensing cycle.
© 2014 IEEE
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