Touch sensing apparatus and method using different modulated driving signals
US8791907B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 19, 2009 |
| Grant date | Jul 29, 2014 |
| Priority date | — |
| Expiry date | Feb 20, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/04166
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.