Patent ID: 7750548
Filing Date: 2010-07-06
Classification: H01J

Abstract:
1. An image display device which comprises a first substrate and a second substrate facing each other, said first substrate having within the region of image display an array of thin-film electron sources having a large number of electron emitting parts arranged in a two-dimensional matrix, said array being composed of a large number of mutually parallel signal wires of aluminum formed on the inside and a large number of mutually parallel scan wires which intersect said signal wires on said signal wires with an interlayer insulating film interposed between them, said electron emitting parts being formed near the intersections of said signal wires and said scan wires, said second substrate having on its inside facing said first substrate a fluorescent plane composed of a plurality of phosphors that emit light upon excitation by electrons released from said array of thin-film electron sources, said thin-film electrons sources being constructed of lower electrodes, which are said signal wires, electron accelerating layers of anodized film, which are formed by anodizing the surface of said signal wires, and upper electrodes, which cover said electron accelerating layers and function as the electron emitting electrodes, said anodized film constituting said electron accelerating layer contains therein a hydrated alumina component and an anhydrous alumina component, with the ratio of said hydrated alumina component to the total amount of said hydrated alumina component and anhydrous alumina component varying from one position to another in said electron accelerating layer such that said ratio in the position close to said upper electrode is greater than said ratio in the position close to the lower electrode.