| 摘要 |
PURPOSE:To make it possible to form a phosphor layer of an optimum thickness with a maximum brightness with a phosphor surface of a two layer structure with a 1st layer for blue phosphor of an average particle diameter of 2.0-5.0mu common for green, blue and red phosphor pattern and a 2nd layer for green, blue and red phosphor pattern. CONSTITUTION:Suspended slurry containing blue light emitting phosphor of an average particle diameter of 2.0-5.0mu is applied on the inner surface of a panel, dried, exposed three times with green, blue and red light with a shadow mask attached to the panel, and developed to form a 1st blue phosphor layer 3. Over them are formed a pattern of green phosphor layer 4, blue phosphor layer 5, and red phosphor layer 6. The three-color fluophor layer has a very large adhesive strength even if phosphor of an average particle diameter larger than 5.0mu is used, as the blue phosphor of a smaller particle diameter which has a coarse surface is already applied. This makes it possible to prevent the phosphor from falling off in the development process even if the film thickness of the phosphor is increased to a limit where brightness becomes a maximum.
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