Patent Number: 8,791,907

Title: Touch sensing apparatus and method using different modulated driving signals

Abstract: 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.

Inventors: Wu; Hung Wei (Zhonghe, TW)

Assignee: U-Pixel Technologies Inc.

International Classification: G06F 3/041 (20060101)

Expiration Date: 7/29/12018