Light emitting device

US10700240B2 · kind B2 · utility

Assignee

• Epistar Corporation · TW

Inventors

• Yao-Ru CHANG · Hsinchu, TW
• Wen-Luh Liao · Hsinchu, TW
• Chun Lin · Yardley, US
• Hsin-Chan CHUNG · Hsinchu, TW
• Hung-Ta Cheng · Hsinchu, TW

Key dates

• Filing date: Dec 2, 2019
• Grant date: Jun 30, 2020
• Expiry date: Dec 2, 2039

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/82

Abstract

The present disclosure provides a light-emitting device. The light-emitting device includes a light emitting area and an electrode area. The light-emitting area includes a first semiconductor structure having a first active layer and a second semiconductor structure having a second active layer. The electrode area includes an external electrode structure surrounding the second semiconductor structure in a top view. The light-emitting area has a shape of circle or polygon in the top view. When the first semiconductor structure is driven by a first current, the first active layer can emit a first light with a first main wavelength. When the second semiconductor structure is driven by a second current, the active layer of the second semiconductor structure can emit a second light with a second main wavelength.