Patent ID: 7145288

Claim:
An image display apparatus including a first substrate on which electron sources having electron-emitting devices are arranged, a second substrate on which a body to be irradiated with electrons emitted from said electron sources are disposed, and a spacer disposed between said first substrate and said second substrate, said spacer provided with an insulating base substrate and a resistance film having a film thickness of d, said resistance film covering said insulating base substrate, said image display apparatus applying an acceleration voltage between said first substrate and said second substrate to accelerate the electrons emitted from said electron sources, wherein said resistance film of said spacer has a sheet resistance Rs 1 (Ω/□) from a surface of said insulating base substrate to a thickness of (d−αλ) and a sheet resistance Rs 2 (Ω/□) from a surface of said resistance film to a thickness of αλ, said resistance Rs 1 and said resistance Rs 2 satisfy the following relationships: 2≦ Rs 2/ Rs 1≦100, and 10 7 ≦Rs 1≦10 14 , wherein λ is a penetration depth of the electron in said resistance film under the acceleration voltage, and (d−αλ)>0, where α is in a range of 0.5 to 1.