Insert for a light emitting device

A light emitting device comprising:

• a substrate comprising a plurality of individually controllable light sources adapted for, in operation, emitting light, at least one insert comprising a partially light-blocking material and having a longitudinal extension being parallel to said substrate, said insert comprising a plurality of transverse elements having a proximal end arranged in proximity of said substrate and a distal end arranged at a distance from said proximal end, said transverse elements being substantially perpendicular to said substrate, said plurality of transverse elements dividing said substrate into at least a first segment comprising a first group of said light sources, a second segment comprising a second group of said light sources, and a third segment comprising a third group of light sources,
• wherein the proximal end of at least one transverse element does not intersect any light source of said plurality of light sources,
• wherein the at least one transverse element gradually transforms/changes in shape over its height to a different profile at the distal end, and
• wherein viewed in projection on a plane along the height of the transverse elements, the at least one transverse element is non-straight, and the proximal end has a stepped profile and the distal end is smoothly curved and wherein the at least one transverse element gradually transforms/changes in shape over its height from the stepped profile to the smooth profile.