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:
Jan. 05, 2016
Filed:
Sep. 14, 2012
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;
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;
EPISTAR CORPORATION, Hsinchu, TW;
Abstract
A light-emitting device comprises a textured substrate comprising a boundary and a plurality of textured structures within the boundary, wherein the textured structures and the textured substrate are both composed of sapphire; and a light-emitting stack overlaying the textured substrate, comprising a first conductivity type semiconductor layer, an active layer, and a second conductivity type semiconductor layer, wherein each of the plurality of textured structures comprises a top portion having a first top-view shape and a bottom portion parallel to the top portion, the bottom portion having a second top-view shape, wherein the first top-view shape comprises a circle or ellipse and the second top-view shape comprises a polygon, wherein the first top-view shape and the second top-view shape overlap each other, and the textured structures are spaced apart from each other from a top view of the light-emitting device.