Patent ID: 7256540

Claim:
An electron emission device comprising: a first substrate and a second substrate facing one another and having a predetermined gap therebetween; an electron emission region, for emitting electrons, on the first substrate; an illumination portion, for displaying images responsive to the electrons emitted from the electron emission region, on the second substrate; and a grid electrode mounted between the first and second substrates and configured to focus the electrons emitted from the electron emission region toward the illumination portion, wherein the grid electrode is provided with a plurality of electron passage openings, at least one of the electron passage openings having an interior wall, the interior wall having at least one portion formed with an inclined plane relative to the first substrate, wherein the at least one of the electron passage openings is provided with a larger diameter portion and a smaller diameter portion, wherein the larger diameter portion has a diameter larger than a diameter of the smaller diameter portion, wherein the larger diameter portion is formed at an upper portion of the at least one of the electron passage openings toward the second substrate, wherein the larger diameter portion has a first depth, wherein the smaller diameter portion is extended continuously from the larger diameter portion and has a second depth, and wherein the first depth is shorter than the second depth.