Patent ID: 6712664
Filing Date: 2004-03-30
Classification: H01J

Abstract:
A process for making a field emission device having a substrate and a phosphor screen comprising:forming a plurality of emitters on the substrate; forming a dielectric layer surrounding at least one emitter of the plurality of emitters; forming a radiation-blocking layer over at least a portion of the dielectric layer surrounding the at least one emitter of the plurality of emitters, the radiation-blocking layer comprises two layers of X-ray-absorbing material having different gaps in an X-ray-absorbing bandwidth; a first of the two layers of X-ray-absorbing material comprising tungsten and a second of the two layers of X-ray-absorbing material comprises lead; positioning the at least one emitter of the plurality of emitters in an opposed position to the phosphor screen; and forming a vacuum between the at least one emitter of the plurality of emitters and the phosphor screen.