Patent ID: 6914377

Claim:
A flat panel for a cathode ray tube comprising: a glass having an outer surface and an inner surface; the outer surface having a flat configuration; the inner surface having a non-spherical, convexly curved configuration relative to the outer surface and satisfying formula 1, Y 1 ≦Y 2 (formula 1) wherein Y 1 represents a vertical distance between the outer surface and a refracted screen image on a central axis of the panel, and Y 2 represents a vertical distance between the outer surface and the refracted screen image in peripheral areas other than the central axis of the panel; and the glass having a first thickness in a central area of the panel and a second thickness in the peripheral areas of the panel, a ratio of the first thickness to the second thickness providing a ratio of transmission in the peripheral areas to that of the central area of 60% or more.