Array type pressure sensing apparatus and pressure measurement method using the same
First Claim
1. A pressure measurement method suitable for pressure sensing using the array type pressure sensing apparatus comprising:
- a plurality of first axes;
a plurality of second axes, being disposed crisscross with the first axes;
a plurality of piezoresistive units, one of which being disposed on the cross between one first axis and one second axis, capable of exhibiting different resistance values when being applied with different pressures;
a third axis, being disposed crisscross with the first axes;
a plurality of standard resistors, one of which being disposed on the cross between one first axis and the third axis, capable of exhibiting a constant resistance value when being applied with different pressures; and
a control unit, having a plurality of I/O ports respectively coupled to the first axes, the second axes and the third axis, through which the control unit performs a tri-state logic scanning and driving process on the first axes, the second axes and the third axis;
the pressure measurement method comprising;
measuring voltage signals of the piezoresistive units and the standard resistor corresponding to each first axis;
forming a voltage dividing matrix comprising the voltage signals of the piezoresistive units and the standard resistor corresponding to each first axis;
forming a conductance matrix comprising inverses of resistance values of the piezoresistive units and the standard resistor, resulting in a product of the voltage dividing matrix and the conductance matrix being a zero matrix to form a set of piezoresistive simultaneous equations; and
solving the set of piezoresistive simultaneous equations to acquire the resistance values of the piezoresistive units.
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Abstract
An array type pressure sensing apparatus suitable for multi-touch sensing and pressure quantification for gray scale identification is provided. The array type pressure sensing apparatus includes a plurality of first axes, a plurality of second axes, a plurality of piezoresistive units, a third axis, a plurality of standard resistors and a control unit. The second axes are disposed crisscross with the first axes, and there is one piezoresistive unit disposed on the cross between one first axis and one second axis. The third axis is disposed crisscross with the first axes, and there is one standard resistor on the cross between one first axis and the third axis. A pressure measurement method implemented using the array type pressure apparatus is also provided. The pressure measurement method is a gray scale identification method by pressure quantification of a linear piezoresistive system.
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Citations
10 Claims
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1. A pressure measurement method suitable for pressure sensing using the array type pressure sensing apparatus comprising:
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a plurality of first axes; a plurality of second axes, being disposed crisscross with the first axes; a plurality of piezoresistive units, one of which being disposed on the cross between one first axis and one second axis, capable of exhibiting different resistance values when being applied with different pressures; a third axis, being disposed crisscross with the first axes; a plurality of standard resistors, one of which being disposed on the cross between one first axis and the third axis, capable of exhibiting a constant resistance value when being applied with different pressures; and a control unit, having a plurality of I/O ports respectively coupled to the first axes, the second axes and the third axis, through which the control unit performs a tri-state logic scanning and driving process on the first axes, the second axes and the third axis;
the pressure measurement method comprising;measuring voltage signals of the piezoresistive units and the standard resistor corresponding to each first axis; forming a voltage dividing matrix comprising the voltage signals of the piezoresistive units and the standard resistor corresponding to each first axis; forming a conductance matrix comprising inverses of resistance values of the piezoresistive units and the standard resistor, resulting in a product of the voltage dividing matrix and the conductance matrix being a zero matrix to form a set of piezoresistive simultaneous equations; and solving the set of piezoresistive simultaneous equations to acquire the resistance values of the piezoresistive units. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification