Color cathode-ray tube
AssigneeMatsushita Toshiba Picture Display Co., Ltd.
InventorsKeisuke Iida, Hidemi Matsuda
Life of this patent
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Abstract
Optical filter layers that transmit only light with a desired wavelength are provided in a non-formation region of an optical absorbing layer formed on an inner surface of a glass panel, and phosphor layers that emit either one of red, green, and blue light are provided on the optical filter layers. The optical filter layers transmit blue light. Assuming that the thickness of the optical filter layer underlying the phosphor layer that emits blue light is t1, and the thickness of the optical filter layers underlying the phosphor layers that emit red and green light is t2, a relationship: t1>t2 is satisfied. Because of the above configuration, a color cathode-ray tube is provided, which can be produced at low cost with satisfactory yield with less peeling of a phosphor layer.
Claims2
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 t1, a thickness of the optical filter layer underlying the phosphor layer that emits red light is t2r, and a thickness of the optical filter layer underlying the phosphor layer that emits green light is t2g, relationships:
- t1>t2r and t1>t2g 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.
Dependencies are inferred from the claim text.