Patent ID: 6534244
Filing Date: 2003-03-18
Classification: G03F

Abstract:
A method of forming field-emission display emitters in a planar substrate, comprising:forming a protective layer on the substrate; forming a photoresist layer on the protective layer; positioning a mask proximate the substrate, the mask comprising a transparent field portion adapted to transmit light and to provide a first optical path length, and a transparent pattern portion adapted to transmit light and to provide a second optical path length, wherein the field and pattern portions are single layers of transparent material and the second optical path length differs from the first optical path length by an odd integer multiple of one-half a wavelength of the light, the pattern portion including a plurality of pattern elements, each being laterally surrounded by the field portion and having equal spatial extent along first and second lateral directions, the first direction being perpendicular to the second direction; illuminating the photoresist layer with light passing through the mask for no more than a single continuous time interval, the light undergoing destructive interference at a plurality of locations of the photoresist layer; removing portions of the photoresist layer and underlying portions of the protective layer, exposing underlying portions of the substrate; and removing portions of the exposed substrate.