US Patent No. 10,074,772

CONTROLLED LED LIGHT OUTPUT BY SELECTIVE AREA ROUGHENING


Patent No. 10,074,772
Issue Date September 11, 2018
Title Controlled Led Light Output By Selective Area Roughening
Inventorship Maciej Benedict, Singapore (SG)
Paul S. Martin, San Jose, CA (US)
Boris Kharas, San Jose, CA (US)
Assignee Lumileds LLC, San Jose, CA (US)

Claim of US Patent No. 10,074,772

1. A method comprising:determining a target light extraction efficiency of a light emitting device;
determining, based on an output function, a proportion of a roughened surface area to a not roughened surface area wherein the light emitting device emits the target light extraction efficiency when configured based on the determined proportion;
applying a surface etch process on a light emitting surface to create the roughened surface area, wherein the roughened surface area relative to the not roughened surface area is based on the determined proportion, and wherein the light emitting surface is a top surface of the light emitting device that is not covered by a contact;
applying an etch-inhibiting pattern on the light emitting surface to create the not roughened surface area, wherein the amount of the not roughened surface area relative to the amount of roughened surface area is based on the determined proportion, and wherein the area that is not roughened surrounds the roughened surface area.