Color cathode ray tube and display device with reduced moire

Details Color cathode ray tube and display device with reduced moire Color cathode ray tube and display device with reduced moire

1995-09-26

1997-04-08

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, H01J 2907

Patent

active

056190948

ABSTRACT:
By selecting the number of apertures in the shadow mask of a color cathode ray tube system to be such that the s/a.sub.v ratio, where s is the scan pitch for the entire frame and a.sub.v is the vertical mask pitch, is between 5.8/8 and 6.4/8 (5.8/8.ltoreq.s/a.sub.v .ltoreq.6.4/8) or between 9.4/8 and 10.6/8 where the lines are progressively scanned or, where the lines are scanned in an interlace mode with a frequency higher than 70 Hz, the s/a.sub.v ratio is between 5.8/8 and 6.4/8 (5.8/8.ltoreq.s/a.sub.v .ltoreq.6.4/8) or between 9.4/8 and 10.6/8, a cathode ray tube system is provided with a reduced occurence of disturbing Moire effects.

REFERENCES:
patent: 5055736 (1991-10-01), Yun et al.
patent: 5378959 (1995-01-01), Mancini

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