Capacitive imaging device with active pixels
US8618865B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 2, 2012 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | Nov 2, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/1306
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus includes a sensor array with a plurality of active pixels. Each active pixel in the sensor array includes: a three transistor (3T) sensor with a source follower transistor, and a detection diode coupled in series to a parasitic capacitor at a sensing junction. A gate of the source follower transistor amplifier is coupled to the sensing junction. The apparatus includes an insulator layer over the sensor array. The insulator layer provides a variable capacitance to the sensing junctions of underlying active pixels in response to portions of an object being proximate to the insulator layer. The variable capacitance is used to detect an image of the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.