Patent ID: 7227302

Claim:
A color cathode-ray tube, comprising: a glass panel; a light absorbing layer formed on an inner surface of the glass panel; an optical filter layer that transmits only light with a desired wavelength provided respectively in a non-formation region of the light-absorbing layer; and a phosphor layer that emits either one of red, green, and blue light provided on the optical filter layer, wherein the optical filter layer transmits blue light, assuming that a thickness of the optical filter layer underlying the phosphor layer that emits blue light is t 1 , a thickness of the optical filter layer underlying the phosphor layer that emits red light is t 2 r, and a thickness of the optical filter layer underlying the phosphor layer that emits green light is t 2 g, relationships: t 1 >t 2 r and t 1 >t 2 g are satisfied, and in each underlying layer of the phosphor layer that emits red light, the phosphor layer that emits green light, and the phosphor layer that emits blue light, only the optical filter layer that transmits blue light is provided as an optical filter layer.