Ultra-dense LED projector
US10388641B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 12, 2018 |
| Grant date | Aug 20, 2019 |
| Priority date | — |
| Expiry date | Feb 12, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/854
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A monolithic display/projector is disclosed comprising a single die having an array of mechanically isolated LED pillars. Each pillar has a height greater than its width, and a pitch between pillars is less than the heights of the pillars. The die comprises an LED display portion bonded to a silicon substrate addressing portion, with one metal contact per pixel. The resolution of the display is preferably about the same as the resolution of the human retina when projected onto the human retina so that the image projected onto the retina may be indistinguishable from the real world. The display may be encapsulated into a contact lens with a focusing optic embedded into the contact lens. To electrically contact the N-type semiconductor layer, the pillars are surrounded by a reflective cathode metal mesh so that the cathode current is coupled through the vertical sides of the N-type layer. The metal mesh mechanically connects the isolated LED pillars and optically isolates each LED pillar. The active layers may emit blue light, and wavelength conversion layers may be used to generate red and green light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.