Light emitting device having a patterned substrate and the method thereof

US7825577B2 · kind B2 · utility

Assignee

• Epistar Corporation · TW

Inventors

• Ta-Cheng Hsu · Hsinchu, TW
• Ya-Lan Yang · Hsinchu, TW
• Ying-Yong Su · Hsinchu, TW
• Ching-Shian Yeh · Hsinchu, TW
• Chao-Shun Huang · Hsinchu, TW
• Ya-Ju Lee · Hsinchu, TW

Key dates

• Filing date: Jul 30, 2007
• Grant date: Nov 2, 2010
• Expiry date: May 16, 2028

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/825

Abstract

This disclosure provides a light-emitting device including a patterned substrate and the manufacturing method thereof. The patterned substrate has a plurality of depressions and/or extrusions for scattering light emitted from a light-emitting layer. Each of the plurality of depressions and/or extrusions comprises a top portion, a bottom portion, and a sidewall portion enclosing the top portion and the bottom portion, and at least part of the sidewall portion comprises a curve. In a preferred embodiment, the light-emitting device further comprises a rough surface formed on at least one of the top portion, the bottom portion, and the sidewall portion.