Patent ID: 6531328
Filing Date: 2003-03-11
Classification: H01L

Abstract:
A process for forming an LED packaging substrate, comprising the steps of:a. providing a silicon wafer substrate having opposing front and back sides; b. applying photoresist on the front side of the silicon wafer substrate; c. exposing and developing the photoresist to define predetermined areas; d. wet etching the substrate to form groove reflectors; e. applying photoresist on the back side of the silicon wafer substrate; f. exposing and developing the photoresist to define a through-hole pattern in respective aligned relationship with the groove reflectors; g. dry etching the through-hole pattern to form electrode holes through the silicon wafer substrate; h. removing the photoresist from the silicon wafer substrate; i. forming an insulation layer on the front and back sides of the substrate by oxidation or nitridation; j. applying a conductive metal layer by electroplating to the front and back sides of silicon substrate and inside electrode holes; and, k. laser treating the conductive metal layer to cut an electrode surface in the groove reflectors into positive and negative electrode contacting surfaces for respective connection with LED chips placed inside the groove reflectors.