Touch sensing apparatus and method using different modulated driving signals

摘要

A touch sensing apparatus utilizes the characteristics of orthogonal vectors is disclosed. A random spread spectrum (RSS) signal or a periodic wave is used to modulate a driving signal so as to driving a row of a sensing array, and the RSS signal or periodic wave is also use to extract touch information of a node from a sensing signal measured from a column of the sensing array. The node is an intersection of the driven row and the measured column. When different RSS signals and/or periodic waves are used to drive multiple rows simultaneously, multipoint touching information can be obtained from the same sensing signal at the same time by respectively using the RSS signals and/or periodic waves to extract touching information of multiple points which are the intersections of the driven rows and the measured column.

主权项

1. A touching sensing apparatus comprising:
a sensing array having multiple rows and multiple columns intersecting with each other to define multiple nodes; a plurality of driving circuits, each for providing a driving signal, which is modulated by a modulation signal, to drive a row of the sensing array; and a plurality of sensing circuits, each receiving a sensing signal measured from a column of the sensing array and extracting touching information of a node, which is an intersection of the driven row and the measured column, by using the modulation signal used by a corresponding one of the driving circuits, wherein there is provided only one row per driving circuit and each row is driven with a different modulated driving signal provided by the driving circuit associated with that row, the modulated driving signal is modulated with a specific pseudorandom (PN) code, the PN code has a characteristic of random spread spectrum, and the sensing signal of the measured column is provided to the respective sensing circuits.