Patent ID: 9640729
Date: 2017-05-02
CPC Classifications: H01L

Claim:
1. A light emitting device comprising: a substantially transparent growth substrate; light emitting diode (LED) layers disposed on the substrate, the LED layers including a p-type layer and an n-type layer, the n-type layer being between the p-type layer and the growth substrate, wherein the LED layers are etched to expose the n-type layer for electrically connecting to an n-metal contact, wherein the etch also creates a trench surrounding the device; a metal contact layer electrically contacting the p-type layer to form a p-metal contact; a first dielectric layer formed over the metal contact layer that contacts the p-type layer, the first dielectric layer having a first opening that exposes the n-type layer, the first dielectric layer having a second opening that exposes the metal contact layer that contacts the p-type layer; a first metal layer that contacts the metal contact layer for electrical connection to the p-type layer; a second metal layer that contacts the n-type layer through the first opening in the first dielectric layer for electrical connection to the n-type layer, wherein the first metal layer and the second metal layer are not planar; a dielectric polymer stress-buffer layer disposed over the first metal layer, the second metal layer, the first dielectric layer, and the p-metal contact, the stress-buffer layer forming a substantially planar surface, the stress-buffer layer having two or more openings exposing a portion of the first metal layer and the second metal layer, wherein the stress-buffer layer at least partially fills the trench; and metal solder pads disposed over the stress-buffer layer, wherein the metal solder pads are electrically connected to the first metal layer and the second metal layer through the openings in the stress-buffer layer, the metal solder pads being thicker than the first metal layer and the second metal layer.