METHOD AND APPARATUS FOR TWO-FINGER TOUCH COORDINATE RECOGNITION AND ROTATION GESTURE RECOGNITION

摘要

A resistive touchscreen system (100) comprises a substrate (104), a coversheet (102) and a controller (138). The coversheet comprises a first conductive coating (106) and the substrate comprises a second conductive coating (108). The substrate and coversheet are positioned proximate each other such that the first conductive coating faces the second conductive coating, and the substrate and coversheet are electrically disconnected with respect to each other in the absence of a touch. The controller is configured to (a) identify a multiple touch state when the substrate and coversheet are electrically connected with respect to each other at at least two touch locations, (b) to detect, over time, a plurality of apparent touch coordinates, (c) identify two possible X coordinates and two possible Y coordinates associated with at least one of the apparent touch coordinates, and (d) identify coordinate locations of two touches based on the apparent touch coordinates and the two possible X and Y coordinates.