Apparatus to detect dual gesture on a resistive screen

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...

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Bibliographic Details
Main Authors LIU XIAOZHAN, IWASAKI MITSUHARU
Format Patent
LanguageEnglish
Published 12.01.2016
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary: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 X/ Y based on VOFS/HOFS, and based on X/Y, determines a distance and angle between the two touches.
Bibliography:Application Number: US201313926702