Patent · US Expired

Method and device for capacitive image acquisition

US6842542B2 · kind B2 · utility

1Cited by

12References

6Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventor

Stefan Jung · Hersbruck, DE

Key dates

Filing date	Mar 8, 2001
Grant date	Jan 11, 2005
Priority date	—
Expiry date	Dec 31, 2022

Classification

Technology area (CPC G)Physics
CPC primaryG06V40/1306
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

The sensor is provided for the capacitive acquisition of images, in particular fingerprint images. The capacitors assigned to each pixel are supplemented by reference electrodes which are capacitively coupled to one another with coupling capacitances. Parallel acquisition of the image with the measuring electrodes and the additional reference electrodes yields, on the one hand, an image subdivided in accordance with the grid, and, on the other hand, local averaging resulting from the capacitive coupling is performed, which is used as a local reference value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.