Position detection method and device
US6919882B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 2, 2003 |
| Grant date | Jul 19, 2005 |
| Priority date | — |
| Expiry date | Dec 10, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0446
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention disclosed a position detection device and method for use in a plane surface to determine the position of a capacitive coupling device. Two arrays of row and column conductive wires form two layers on a substrate, said two layers are isolated by an insulated layer; between each two row wires there is a common row wire; between each two column wires there is a common column wire. Said common row and common column wires are connected to a common row terminal and common column terminal respectively. AC signal is applied to two adjacent wires sequentially to determine point P is between row k and row k+1. Then AC signal is applied to row k only, and then applied to row k+1 only, to determine point P is near row k or row k+1. Finally, apply AC signal to common rows and then to all rows to determine point P is closed to row wire or common wire. Then repeats the above process for the columns. By combining the above processes the position in a two-dimensional space is determined. This method increases the accuracy of detection with less conductive row wires and column wires.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.