Light emitting device with optical enhancement structure

A light emitting device having a plurality of pixels, each pixel defined by a structure comprising:

• a light emitting element, wherein some of the light from the light emitting element is emitted in a diverging manner;
• and
• an optical enhancement structure, having an optical characteristic that directs diverging light from the light emitting element along a path within the optical enhancement structure in a direction towards a normal of the light emitting element, wherein the optical enhancement structure comprises a light emerging surface that includes a flat central surface of a defined width that is orthogonal to the normal, and corner surfaces contiguous to both ends of the flat central surface, wherein the corner surface have profiles that are not orthogonal to the normal.

A method of enhancing light output from a light emitting element of a pixel in a light emitting device, comprising the steps of:

• providing an optical enhancement structure that has a single convex light emerging surface, said optical enhancement structure having an optical characteristic that refracts incident light to transmit along a path within the optical enhancement structure towards a normal of the light emerging surface, wherein the optical enhancement structure comprises a light emerging surface that includes a flat central surface of a defined width that is orthogonal to the normal, and corner surfaces contiguous to both ends of the flat central surface, wherein the corner surfaces have profiles that are not orthogonal to the normal;
• and
• optically coupling the optical enhancement structure to the light emitting element to direct diverging light from the light emitting element along a path within the optical enhancement structure towards the normal of the light emerging surface.