A surface light source device comprises a lower substrate, a cathode electrode formed on the lower substrate, an electron emitter connected electrically to the cathode electrode, an upper substrate comprising a plurality of space parts and a plurality of space partitioning parts, wherein the plurality of space parts and the lower substrate form an emitting space over the electron emitter and the plurality of space partitioning parts divide adjacent space parts, and a fluorescent layer and an anode electrode formed on the upper substrate.

 
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