Process for forming phosphor screen of monochrome cathode ray tube and phosphor screen produced thereby
AssigneeMatsushita Electronics Corporation
InventorsJunichi Masuda, Tadayuki Tsuchiyama
Life of this patent
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Abstract
This invention provides a process for forming a phosphor screen of a monochrome cathode ray tube (projection tube) which has an improved luminance remaining property. The phosphor particles are settled on an inner surface of a glass bulb with a binder of SiO.sub.2 to form a phosphor layer, in which the amount of SiO.sub.2 is reduced by rinsing with a water-based liquid like deionized water and a PVA solution before forming an organic layer on the phosphor layer. The phosphor screen has an improved luminance remaining property that is close to that of a direct viewing color cathode ray tube, without lowering the screen quality.
Claims15
A process for forming a phosphor screen of a monochrome cathode ray tube, which comprises:
- settling phosphor particles on the inner surface of a main body of a monochrome cathode ray tube from a phosphor suspension including phosphor particles and SiO.sub.2 to form a phosphor layer including the phosphor particles and the SiO.sub.2 as a binder for the phosphor particles, drying the phosphor layer, and forming an organic layer on the phosphor layer, wherein the amount of SiO.sub.2 in the phosphor layer is reduced by removing from the dried phosphor layer SiO.sub.2 not needed as the binder before forming the organic layer.
A phosphor screen of a monochrome cathode ray tube, which comprises a phosphor layer formed by a process comprising:
- settling phosphor particles on the inner surface of a main body of a monochrome cathode ray tube from a phosphor suspension including phosphor particles and SiO.sub.2 to form a phosphor layer including the phosphor particles and the SiO.sub.2 as a binder for the phosphor particles,
- drying the phosphor layer, and
- forming an organic layer on the phosphor layer, wherein the amount of SiO.sub.2 in the phosphor layer is reduced by removing from the dried phosphor layer SiO.sub.2 not needed as the binder before forming the organic layer.
A monochrome cathode ray tube including a phosphor screen, which comprises a phosphor layer formed by a process comprising:
- settling phosphor particles on the inner surface of a main body of a monochrome cathode ray tube from a phosphor suspension including phosphor particles and SiO.sub.2 to form a phosphor layer including the phosphor particles and the SiO.sub.2 as a binder for the phosphor particles,
- drving the phosphor layer, and
- forming an organic layer on the phosphor layer, wherein the amount of SiO.sub.2 in the phosphor layer is reduced by removing from the dried phosphor layer SiO.sub.2 not needed as the binder before forming the organic layer.
Dependencies are inferred from the claim text.