Patent ID: 7595584

Claim:
An electron emission device comprising: a substrate; a plurality of first electrodes on the substrate; a plurality of electron emission regions electrically connected to the first electrodes; a plurality of second electrodes over the first electrodes with an insulating layer interposed between the first electrodes and the second electrodes, the second electrodes crossing the first electrodes to form a plurality of crossing regions; and a focusing electrode over the second electrodes with an additional insulating layer interposed between the second electrodes and the focusing electrode, wherein at least two rows of the electron emission regions are arranged at respective crossing regions along a longitudinal direction of the first electrodes, and the electron emission regions at the respective rows are deviated from each other in a longitudinal direction of the second electrodes, wherein the insulating layer and the second electrodes have a plurality of opening portions corresponding to the respective electron emission regions to expose the electron emission regions, wherein the additional insulating layer and the focusing electrode have one opening portion at each of the crossing regions for exposing the at least two rows of the electron emission regions arranged at the corresponding crossing regions, wherein, at the location of the electron emission regions perpendicular to the at least two rows, the opening portion of the focusing electrode comprises a short distance where a first side end of the opening portion of the focusing electrode and a first side end of a corresponding one of the opening portions of the second electrodes are spaced apart from each other with a first gap A, and a long distance where a second side end of the opening portion of the focusing electrode opposite the first side end of the opening portion of the first electrode and a second side end of the corresponding one of the opening portions of the second electrodes are spaced apart from each other with a second gap B, wherein the long distance of the second gap B is not less than twice the short distance of the first gap A.