Patent ID: 7750550

Claim:
A surface light source device comprising: a lower substrate including a groove extending in a direction, a gate electrode forming part adjacent to the groove, and a supporting part adjacent to the gate electrode forming part, the supporting part disposed higher than the groove and the gate electrode forming part; a cathode electrode formed on the lower substrate; an electron emitter electrically connected to the cathode electrode; an upper substrate comprising a plurality of space parts and a plurality of space partitioning parts, each of the space parts and the space partitioning parts extending in the direction, each of the space parts facing the groove, wherein the electron emitter is positioned in the groove below an upper surface of the lower substrate, 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 formed on the upper substrate; and an anode electrode formed on the upper substrate, the anode electrode comprising a transparent material so that a light emitted from the fluorescent layer is transmitted to an outside of the upper substrate through the anode electrode, wherein the space partitioning parts contact the supporting part of the lower substrate.