Patent ID: 7615916
Filing Date: 2009-11-10
Classification: H01J

Abstract:
1. An electron emission device comprising: driving electrodes for controlling emission of electrons from electron emission regions formed on a substrate; an insulating layer over the driving electrodes, the insulating layer having a first insulating tier over one of the driving electrodes and a second insulating tier over the first insulating tier; and a focusing electrode over the insulating layer, wherein the first insulating tier and the second insulating tier have opening portions exposing the electron emission regions on the substrate, and wherein the opening portions of the first insulating tier are different from the opening portions of the second insulating tier in thickness, or in cross-sectional area, or in both thickness and cross-sectional area, and wherein the first insulating tier has a plurality of first opening portions and the second insulating tier has a plurality of second opening portions such that two or more of the second opening portions interface with a corresponding one of the first opening portions.