Method of fabricating light-emitting diode with a micro-structure lens

1. A method of fabricating a light emitting diode (LED) with a micro-structure lens, comprising:

receiving a light emitting diode (LED) die on a substrate; and

molding the micro-structure lens that has at least one concentric ridge over the LED die,

wherein a first optical path length from an edge of the LED die to a top center of the micro-structure lens is substantially the same as a second optical path length from the edge of the LED die to a side of the micro-structure lens.

2. The method of claim 1 , further comprising forming a reflective layer on the substrate.

3. The method of claim 2 , further comprising forming a solder layer on the reflective layer.

4. The method of claim 1 , further comprising bonding the LED die to the substrate.

5. The method of claim 1 , further comprising wire bonding the LED die.

6. The method of claim 1 , further comprising forming a phosphor coating on the LED die.

7. The method of claim 1 , further comprising etching the micro-structure lens after the molding.

8. A method, comprising:

forming a reflective layer over a substrate;

bonding a light-emitting diode (LED) die to the reflective layer;

coating a phosphor material over the LED die; and

molding a lens over the LED die such that the lens is molded to have a convex lens portion and a plurality of ridges circumferentially surrounding the convex lens portion in a top view, wherein a first optical path length from an edge of the LED die to a top center of the lens is about the same as a second optical path length from an edge of the LED die to a side of the lens, and wherein the convex lens portion has a greater lateral dimension than the LED die.

9. The method of claim 8 , wherein the molding of the lens comprises molding a curved side surface of the lens and molding pointed or curved peaks for the plurality of ridges, respectively.