The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 09, 2008
Filed:
Feb. 26, 2006
Yun-li LI, Tao-Yung Hsien, TW;
Hui-ching Feng, Tao-Yung Hsien, TW;
Yun-Li Li, Tao-Yung Hsien, TW;
Hui-Ching Feng, Tao-Yung Hsien, TW;
Formosa Epitaxy Incorporation, Tao-Yung Hsien, TW;
Abstract
An LED chip with double close-loop electrode design includes a substrate, a first-type doped semiconductor layer, a light emitting layer, a second-type doped semiconductor layer, a first electrode and a second electrode. The first-type doped semiconductor layer is disposed on the substrate, the light emitting layer is disposed on the first-type doped semiconductor layer and the second-type doped semiconductor layer is disposed on the light emitting layer. The first electrode, disposed on the first-type doped semiconductor layer, has a close-loop pattern. The second electrode, disposed on the second-type doped semiconductor layer, is located inside a region encircled by the first electrode and has a close-loop pattern. In this way, the LED chip with double close-loop electrode design is able to avoid deteriorated luminous efficiency caused by broken electrodes.