Color picture tube with reduced raster distortion and flat appea

Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control

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Details

220 21A, 313477R, 313408, H01J 2986

Patent

active

053192800

ABSTRACT:
A display device having a rectangular display window with a major and a minor dimension, and a deflection unit producing a scanning line raster on a display screen on the inner surface of the display window, the scan lines extending in the minor direction. The inside surface of the display window has a major radius of curvature (R.sub.cmajor), a minor radius of curvature (R.sub.cminor), a diagonal dimension (D) and an aspect ration (A), which parameters are related by the formulas 1.1<R.sub.cminor /D<2.5, also 2.5<R.sub.cmajor /D, also R.sub.cmajor >A*R.sub.cminor. The display window is thereby very flat and scanning line raster distortion is reduced so that it is easily correctible by the deflection fields produced by the deflection unit.

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