Patent ID: 7728505

Claim:
A field emission luminescent light source, comprising: a bulb being vacuum sealed and having an inner surface; a lamp head mated with the bulb; an electron emitting cathode filament positioned in the bulb, the electron emitting cathode filament comprising an one-dimensional metallic wire and a plurality of electron emitters formed on the outer surface of the metallic wire, wherein substantially all the electron emitters extend radially from and are substantially perpendicular to the outer surface of the metallic wire; an anode layer located on the inner surface of the bulb; a phosphor layer located on the anode layer; an anode electrode located at the lamp head and electrically connected with the anode layer; a cathode electrode located at the lamp head and electrically connected with the electron emitting cathode filament; and a cage shaped gate grid structure surrounding the cathode filament, and a gate electrode located at the lamp head, wherein the cage shaped gate grid structure is electrically connected with the gate electrode, the cage shaped gate grid structure is weaved metallic wire defining a plurality of grid holes therein, the cathode filament is enclosed in the cage shaped gate grid structure.