Printed LEDs embedded in objects to provide optical security feature
US10402610B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 2018 |
| Grant date | Sep 3, 2019 |
| Priority date | — |
| Expiry date | Jun 13, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/857
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In one embodiment, a printed LED area comprises a random arrangement of printed LEDs and a wavelength conversion layer. The LED area is embedded in an object to be authenticated, such as a credit card or a casino chip. The object may include a light guide for enabling the generated light to be emitted from any portion of the object. In one embodiment, when the LEDs are energized during authentication of the object, the existence of light emitted by the object is sufficient authentication and/or provides feedback to the user that the object is being detected. For added security, the emitted spectrum vs. intensity and persistence of the wavelength conversion layer is detected and encoded in a first code, then compared to valid codes stored in the database. If there is a match, the object is authenticated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.