SYSTEMS AND METHODS FOR SENSING PRESSURE IN TOUCH SENSITIVE DEVICES

摘要

A touch sensitive device, comprising touch interface comprising rows and columns, a signal generator for generating a plurality of unique orthogonal signals on at least a plurality of the rows, respectively, capacitive sensors on at least a plurality of the columns for sensing changes in the amount of capacitive coupling between the rows and the columns on the touch interface, and a touch processor for identifying a pressure of touch on the touch interface by processing the amount of pressure applied to the touch interface based on the capacitive coupling. Methods for inferring contact pressure, calculating an inferred touch pressure, and calculating a single gradient value are also presented.

主权项

1. An apparatus for measuring pressure using a orthogonal signals on a touch detector, comprising:
plurality of row conductors and a column conductor, arranged such that the path of each of the plurality of row conductors cross the path of the column conductor, the location where each of the plurality of row conductors crosses the column conductor forming an intersection; plurality of signal emitters adapted to simultaneously transmit at least one of a plurality of orthogonal signals on each of the plurality of row conductors, respectively; receiver adapted to receive a frame on the column; signal processor adapted to determine a measure of each of the simultaneously transmitted orthogonal signals present within the received frame; and touch processor adapted to determine an amount of pressure associated with a contact area resulting from a contact affecting at least two intersections, and based, at least in part, on at least two of the measures.