s Uneo Ultra Compact Stylus Force Sensor, based on patented Micro-Deformable Piezoresistive Material
, enables pressure sensitivity in an active electronic stylus for touchscreen-enabled products, such as a cell phone, a tablet computer or a digital white board.
Polysilicon is chosen as the piezoresistive material
which senses the movement of the membrane.
The instrument is made of a piezoresistive material
that changes voltage as its capacitance is altered by gas velocity.
Due to imperfections in manufacturing and non-ideal contact between the piezoresistive material
and the electrodes, there are different responses from neighbouring cells for the same stimuli (up to 5% of the whole range).
Through various design configurations, piezoresistive materials
can be used for force, pressure, and flexure sensing [1, 3].
Key words: tactile sensors, piezoresistive materials
, robotics, PVDF, piezoelectricity, object recognition