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:
Jul. 14, 2020
Filed:
Aug. 01, 2018
Epistar Corporation, Hsinchu, TW;
Yen-Tai Chao, Hsinchu, TW;
Sen-Jung Hsu, Hsinchu, TW;
Tao-Chi Chang, Hsinchu, TW;
Wei-Chih Wen, Hsinchu, TW;
Ou Chen, Hsinchu, TW;
Yu-Shou Wang, Hsinchu, TW;
Chun-Hsiang Tu, Hsinchu, TW;
Jing-Feng Huang, Hsinchu, TW;
EPISTAR CORPORATION, Hsinchu, TW;
Abstract
A light-emitting device includes a substrate having a top surface, wherein the top surface includes a first portion and a second portion; a first semiconductor stack including a first upper surface and a first side wall, wherein the first semiconductor stack is on the first portion; a second semiconductor stack including a second upper surface and a second side wall, wherein the second semiconductor stack is on the first upper surface, and wherein the second side wall is devoid of connecting the first side wall; a plurality of first concavo-convex structures on the first portion; and a plurality of second concavo-convex structures on the second portion; wherein the first side wall and the second portion of the top surface form an acute angle α between thereof; and wherein the second concavo-convex structures have smaller size than that of the first concavo-convex structures.