Patent ID: 7781155

Claim:
A method of fabricating a micro lens, the method comprising: forming a photo-sensitive film on a substrate; placing a photo mask at a predetermined distance from a top of the photo-sensitive film; exposing the photo-sensitive film by varying an area of exposure of the photo-sensitive film so as to selectively expose three-dimensional structures of the photo-sensitive film corresponding to desired micro lenses; and developing the photo-sensitive film such that the exposed three-dimensional structures remain, wherein the area of exposure of the photo-sensitive film is varied by adjusting a distance between the photo mask and the photo-sensitive film, and wherein the exposing the photo-sensitive film comprises exposing the photo-sensitive film after the placing a photo mask at a predetermined distance from a top of the photo-sensitive film, temporarily stopping the exposing and moving the photo mask in a vertical direction such that the distance is changed, and additionally exposing the photo-sensitive film using the moved photo mask.