Texas Instruments Corporation

Xiaozhan Liu

Jiong-Ping Lu

Lance Stanford Robertson

Duofeng Yue

Donald S Miles

Mitsuharu Iwasaki

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 Rof the variable resistor, and monitors a variable resistor voltage VRbased on IL/N*R. A processor determines calibration voltages for the X and Y plates corresponding to the mirror current IL/N for X/Y voltage values of VRfor a no touch condition, and X/Y offset voltages VOFS and HOFS of VRfor 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 &#x394;X/&#x394;Y based on VOFS/HOFS, and based on X/Y, determines a distance and angle between the two touches.

Apparatus to detect dual gesture on a resistive screen

Fluorine containing regions () are formed in the source and drain regions () of the MOS transistor. A metal layer () is formed over the fluorine containing regions () and the source and drain regions (). The metal layer is reacted with the underlying fluorine containing regions to form a metal silicide.

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Plano, TX, United States of America

Xiaozhan Liu