Monochromatic cathode ray tube having scattered electron suppres

Details Monochromatic cathode ray tube having scattered electron suppres Monochromatic cathode ray tube having scattered electron suppres

1997-06-30

1998-05-12

Patel, Nimeshkumar

Electric lamp and discharge devices

Cathode ray tube

Screen

313479, 313473, 313461, H01J 2918

Patent

active

057511020

ABSTRACT:
The present invention concerns a cathode ray display tube in which the layers of a scattered electrons suppressing material are formed on the surface of a metal back layer on a phosphor layer and the inner surface of a funnel part. Each of the scattered electrons suppressing material layers on the surface of the metal back layer and on the inner surface of the funnel part is formed with an amount per unit area within specific ranges. The scattered electrons suppressing material layer is provided to form a laminated layer which is composed of lamina shaped graphite particles with a diameter which is ten times or more as large as a thickness and an average particle size in terms of spherical volume not more than 2 .mu.m. The scattered electrons suppressing material layers reduce unnecessary light emission due to scattered electrons and improve the contrast of a display image. A projection display system providing a display image with high contrast can be constituted by using the cathode display tubes.

REFERENCES:
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patent: 4221990 (1980-09-01), Yamazaki et al.
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patent: 4623820 (1986-11-01), Deal et al.
patent: 4723090 (1988-02-01), Maeda et al.
patent: 5451835 (1995-09-01), Yamazaki et al.

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