Patent ID: 8143775
Filing Date: 2012-03-27
Classification: H01J

Abstract:
1. A field emission light source comprising: a wavelength range converting material; an evacuated chamber arranged inside a housing, thereby forming a double wall structure; and an anode and a cathode arranged inside said evacuated chamber, wherein said cathode is arranged to emit electrons when a voltage is applied between said anode and said cathode, said anode is arranged to emit light at a first wavelength range when receiving electrons emitted from said cathode, said wavelength range converting material is arranged to receive said emitted light of said first wavelength range and to emit light at a second wavelength range, said first wavelength range is about 100 nm to 450 nm, said second wavelength range is about 350 nm to about 900 nm, said anode is composed of a transparent substrate on one side covered by a transparent electrically conducting material sandwiched between said substrate and an emission material, and said wavelength range converting material is separated from said transparent substrate.