Low profile illumination in an optical fingerprint sensor
US10181070B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2016 |
| Grant date | Jan 15, 2019 |
| Priority date | — |
| Expiry date | Jan 28, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/58
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical fingerprint sensor includes: cover glass for receiving a finger; a transparent electrode layer below a bottom surface of the cover glass; an organic light emitting diode layer (OLED) below the transparent electrode layer; and a metal electrode layer below the OLED layer. Multiple openings extend through each of the transparent electrode layer, OLED layer, and metal electrode layer, and transmit reflected light reflected from a top surface of the cover glass when a finger is positioned over the top surface of the cover glass. A collimator or pinhole filter is below the metal electrode layer, and includes multiple apertures for transmitting the reflected light after the reflected light is transmitted through the multiple openings. An imager is below the bottom surface of the collimator or pinhole filter, and includes an array of pixels that detects the reflected light after the reflected light is transmitted through the multiple apertures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.