Patent ID: 7652419

Claim:
An electron emission device comprising: a substrate; first electrodes formed on the substrate; electron emission regions electrically connected to the first electrodes; second electrodes placed over the first electrodes such that the second electrodes are insulated from the first electrodes, the second electrodes having openings to expose the electron emission regions; and a third electrode placed over the second electrodes such that the third electrode is insulated from the second electrodes, the third electrode having openings communicating with the openings of the second electrodes; wherein each of the electron emission regions and the second electrodes simultaneously satisfy the following conditions: D 2/ D 1≦0.467 (1) and D2≧1 μm (2) where D 1 indicates the width of each of the openings of the second electrodes, and D 2 indicates the width of each of the electron emission regions.