LED display with patterned pixel landings and printed LEDs
US10417956B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 2018 |
| Grant date | Sep 17, 2019 |
| Priority date | — |
| Expiry date | Dec 13, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/872
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
Pixel locations in an addressable display are defined by metal landings on a top surface of a flexible substrate, such as by depositing a metal film and etching the film. The substrate surface may be hydrophobic so that the hydrophobic surface is exposed between the metal landings. The substrate has conductive vias that connect the metal landings to traces on a bottom surface of the substrate for connection to addressing circuitry. LED ink is then blanket-printed over the top surface and cured to electrically connect bottom electrodes of the LEDs to the metal landings. LEDs that fall between the landings are ineffective. A dielectric layer is blanket-printed which exposes the top electrodes, and a transparent conductor layer is blanket-printed over the LEDs to connect all LEDs associated with an individual pixel location in parallel. Accordingly, all printed steps can be performed without any alignment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.