Patent ID: 7518304

Claim:
A flat panel display device comprising: a first substrate; an electron emission region on the first substrate; a second substrate facing the first substrate and forming a vacuum vessel with the first substrate; and a light emitting region for emitting light derived by electrons emitted from the electron emission region and comprising an anode on the second substrate in a pattern and a phosphor screen on at least one side of the anode, wherein a proportion, k, between a screen weight of the phosphor screen and an average diameter of phosphor particles in the phosphor screen satisfies: k=S/ ( D·n ) where, k ranges from about 0.16 to 0.20 mg/cm 2 ·μm, is the screen weight in mg/cm 2 , D is the average diameter of the phosphor particles in μm, and n is a number of phosphor layers accumulated in the phosphor screen.