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:
Feb. 25, 2020
Filed:
Mar. 09, 2018
Ledengin, Inc., San Jose, CA (US);
Xiantao Yan, Palo Alto, CA (US);
LedEngin, Inc., San Jose, CA (US);
Abstract
An emitter for an LED-based lighting device can incorporate 'flip-chip' LEDs, in which all electrical contacts are disposed on the bottom surface of the chip. The emitter base can be a multilayer high-temperature cofired ceramic (HTCC) substrate, with metal traces formed between the layers and vias through the layers to join traces in different layers, thereby providing electrical connectivity to each LED. The paths can be arranged such that current can be supplied independently to different subsets of the LEDs. The top layer of the emitter base is fabricated with exposed vias at the top surface. Metal pads are then printed onto the exposed vias on the top surface, and flip-chip LEDs are bonded to the metal pads, e.g., using solder.