Patent ID: 7511413

Claim:
An electron emission device comprising: a first substrate and a second substrate facing each other and separated from each other by a predetermined distance; an electron emission unit on the first substrate; a light emission unit on a surface of the second substrate facing the first substrate; and a grid electrode between the first substrate and the second substrate, the grid electrode having a hole region with a plurality of electron beam-guide holes and a no-hole region surrounding the hole region, wherein the first substrate has a first active area and a first outer portion, wherein the second substrate has a second active area and a second outer portion, and wherein the grid electrode spans a larger area than the first active area and the second active area, and the no-hole region corresponds to the first outer portion, wherein the electron emission unit includes an electron emission region and a cathode electrode electrically connected to the electron emission region, and the light emission unit includes a phosphor layer and an anode electrode formed on a surface of the phosphor layer, and the grid electrode meets the following formula: W â‰¥ Max â¢ { d_am Ã— Va - Vm 1400 â¢ â¢ V , d_mc Ã— Vm - min â¡ ( Vc ) 50 â¢ â¢ V } where W is a width of the no-hole region d_am is a distance between the anode electrode and the grid electrode, d_mc is a distance between the grid electrode and the cathode electrode, Va is an anode voltage, Vm is a grid voltage, and Vc is a cathode voltage.