Structured substrate for a LED

US7943950B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Hans-Helmut Bechtel · Roetgen, DE
• Wolfgang Busselt · Roetgen, DE

Key dates

• Filing date: Apr 6, 2006
• Grant date: May 17, 2011
• Expiry date: Apr 4, 2028

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K50/854

Abstract

A substrate (1) made of a transparent material, preferably glass, which substrate has a planar first side (1a) for the application of an electroluminescent layered structure (21, 22, 23) for emitting light and having a structured second side (1b) for the effective coupling-out of light (6), comprising at least one element of structure (2) comprising first regions (3) having first surfaces (3a) that have a surface roughness of between 0.2 μm and 100 μm, and preferably of between 0.4 μm and 70 μm, and as a particular preference of between 0.7 μm and 40 μm.