A flat lamp device includes lower and upper glass plates facing each other
in parallel; spacers interposed between the plates to keep a distance
therebetween; a cathode electrode singly formed over the entire upper
surface of the lower glass plate; an insulation film formed on the
cathode electrode; semiconductor films independently patterned on the
insulation at intervals; a catalyst metal layer laminated on a buffer
metal layer to improve adhesive force of the catalyst metal formed on the
semiconductor films; carbon nano-tubes formed on the catalyst metal
layer; a grid electrode installed above the carbon nano-tubes between the
plates to guide electron emission from the carbon nano-tubes with a mesh
shape having an opening for passage of the emitted electrons; an anode
electrode formed below the upper glass plate to accelerate the emitted
electrons; and a fluorescent layer formed on a lower surface of the anode
electrode.