Shadow mask in color CRT
AssigneeLG Electronics Inc.
InventorsYeoung Ku Kim, Sang Mun Kim, Yoon Lae Cho
Life of this patent
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Abstract
Shadow mask in a color CRT including an electron reflective film formed, starting from a surface of the shadow mask, down to an inside surface of each of holes, or an electron reflective film formed on a surface of the shadow mask facing an electron gun, or on the surface of the shadow mask and an inside tapered surfaces of holes of the shadow mask and another electron reflective film formed on a surface of the electron reflective film formed on the shadow mask facing an electron gun, thereby reducing thermal deformation of the shadow mask, with a consequential reduction of doming, that prevents mislanding of the electron beams, color dispersion of the color CRT, to improve a color purity.
Claims20
A shadow mask in a color CRT, comprising:
- a first electron reflective film layer formed on a surface of the shadow mask facing an electron gun and on inside tapered surfaces of holes of the shadow mask facing the electron gun;
- and
- a second electron reflective film layer formed on a surface of the first electron reflective film layer formed on a surface of the shadow mask facing the electron gun.
A shadow mask in a color CRT, comprising:
- a first electron reflective film layer formed on a surface of the shadow mask facing an electron gun;
- and
- a second electron reflective film layer formed on a surface of the first electron reflective film layer formed on a surface of the shadow mask facing the electron gun and on inside tapered surfaces of holes of the shadow mask facing the electron gun.
A color cathode ray tube, comprising:
- a panel having a coat of fluorescent film applied to an inside surface thereof
- a funnel welded to the panel with fusion glass, the funnel having a coat of conductive graphite applied to an inside surface thereof
- a neck portion having a coat of conductive graphite applied to an inside surface thereof
- an electron gun provided in the neck portion;
- and
- a shadow mask having a plurality of slots positioned opposite the fluorescent film, wherein an electron reflective film layer is formed from a surface of the shadow mask opposite the neck portion and throughout an inside surface of each of the slots, wherein the electron reflective film comprises PbO, WO3, Bi2O3, Frit glass, and graphite.
Dependencies are inferred from the claim text.