Light-emitting device and lighting apparatus
US12426405B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2022 |
| Grant date | Sep 23, 2025 |
| Priority date | — |
| Expiry date | Dec 14, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H29/10
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A light-emitting device includes a substrate and an epitaxial unit. The substrate has a first and a second surface. The substrate is formed on the first surface with a plurality of protrusions. The epitaxial unit includes a first semiconductor layer, an active layer, and a second semiconductor layer that are sequentially disposed on the first surface of the substrate. The first surface of the substrate has a first area that is not covered by the epitaxial unit, and a second area this is covered by the epitaxial unit. A height difference (h2) between the first area and the second area is no greater than 1 μm. A display apparatus and a lighting apparatus are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.