Patent ID: 7378789

Claim:
An electron emission device comprising: a first substrate; a second substrate facing the first substrate and spaced apart from the first substrate; an electron emission unit formed on the first substrate, the electron emission unit having a first electrode, a second electrode, and an electron emission region for emitting electrons; and a light emission unit formed on the second substrate and adapted to be excited by an electron beam formed with the electrons; wherein the electron emission unit includes a focusing electrode for focusing the electron beam; wherein the light emission unit includes a phosphor screen on which a plurality of pixels are arranged in a pattern, each of the pixels having a phosphor layer, the phosphor layer of at least one of the pixels being adapted to be excited by the electron beam; and wherein the focusing electrode includes a beam-passing opening, through which the electron beam passes, and, when a vertical length of the beam-passing opening is L V and a vertical pitch of at least one of the pixels is P V , the vertical length L V and the vertical pitch P V satisfy: 0.25 ≦L V /P V ≦0.60.