US Patent 8465172 Lighting module with diffractive optical element

A lighting module having an array of light-emitting elements on a substrate, at least one diffractive optical element arranged to receive light from the light-emitting elements and partially collimate the light. A method of packaging a lighting module including mounting at least one array of light-emitting elements on a substrate in a package, and enclosing the package with a window, the window has a diffractive optical element on a surface of the window closest to the array, the diffractive optical element arranged to partially collimate the light. A lighting module having an array of light-emitting elements on a substrate, at least one diffractive optical element arranged to receive light from the light-emitting elements and scatter the light into a random emission pattern to produce a uniform irradiance at a target surface.