Mutual capacitance large panel phase shift mitigation
US9235280B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 24, 2012 |
| Grant date | Jan 12, 2016 |
| Priority date | — |
| Expiry date | Nov 2, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/045
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of mitigating a phase shift in a mutual capacitance touch screen panel having a plurality of row conductors intersecting with a plurality of column conductors to form a matrix of pixels, the method comprising: driving the row conductors with row drive signals formed from an excitation matrix, wherein each row in the excitation matrix is orthogonal to every other row in the excitation matrix, and the excitation matrix has a dimension larger than the matrix of pixels; sensing signals from the column conductors; and determining the mutual capacitance of the pixels using the sensed signals and an inverse of the excitation matrix. The excitation matrix can be a Hadamard matrix or a modified Hadamard matrix and can comprise a cyclic extension at the end of each row. A different region-specific phase shift can be applied to different clusters of signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.