Patent ID: 7663298

Claim:
A light source apparatus comprising: a rear plate; a front plate comprising a plurality of concave curved portions and a plurality of flat portions, wherein the plurality of flat portions are parallel to the rear plate; a plurality of supporting poles, each supporting pole is located between one flat portion and the rear plate; an inner surface of each curved portion defines a first receiving area; each two adjacent supporting poles, the corresponding flat portions, and the rear plate cooperatively define a second receiving area; a field emission cathode located between the rear plate and the front plate, and comprising a plurality of electrically conductive carriers and a plurality of field emitters located on the conductive carriers; wherein the conductive carriers are located in the second receiving areas and not in the first receiving areas; and a first anode located on the front plate and facing toward the field emission cathode, the first anode comprising a plurality of concave curved portions corresponding to the plurality of concaved curved portions of the front plate and a plurality of flat portions corresponding to the plurality of flat portions of the front plate.