Apparatus to detect dual gesture on a resistive screen
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United States of America Patent
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Jan 12, 2016
Grant Date -
Jan 2, 2014
app pub date -
Jun 25, 2013
filing date -
Jun 25, 2012
priority date (Note) -
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Abstract
A resistive touch screen controller provides two-finger gesture recognition. Current mirror circuitry, coupled to the XP/XN and YP/YN conductors, generates a screen current IL corresponding to X/y plate currents, and a corresponding mirror current IL/N. A variable resistor receives mirror current IL/N, and a resistance controller sets the resistance value R1 of the variable resistor, and monitors a variable resistor voltage VR1 based on IL/N*R1. A processor determines calibration voltages for the X and Y plates corresponding to the mirror current IL/N for X/Y voltage values of VR1 for a no touch condition, and X/Y offset voltages VOFS and HOFS of VR1 for a two touch condition. For a two touch condition, the processor determines touch resistance relative to no touch, and generates an adjusted X/Y plate resistance ΔX/ΔY based on VOFS/HOFS, and based on X/Y, determines a distance and angle between the two touches.
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