a lens structure is pre - formed with features that facilitate accurate alignment of a light emitting chip within the lens structure . to ease manufacturing , the features include tapered walls that allow for easy insertion of the light emitting chip into the lens structure , the taper serving to accurately align the light emitting chip when the chip is fully inserted . the taper may include linearly sloped or curved walls , including complex shapes . an adhesive may be used to secure the light emitting chip to the lens structure . the light emitting chips may be picked - and - placed into an array of lens structures , or picked - and - placed onto a substrate that may be overlaid by the array of lens structures .