Colour display tube

Details Colour display tube Colour display tube

H - Electricity

01

J

313/35.16

H01J 29/07 (2006.01)

Patent

CA 1181463

ABSTRACT : 9 "Colour display tube". By causing, in a shadow mask (16) of a colour display tube of the "in-line" type, the mask transmission according to the invention to decrease in the Y-direction more slowly as compared with a circular transmission vari- ation and causing the transmission in the direction to decrease more rapidly in comparison with a circular trans- mission variation from the centre towards the edge of the shadow mask, a) a shadow mask is obtained having a larger transmission in the central portion of the mask without the guard band becoming too small in the critical places of the display screen (5) outside -the central portion, or b) a shadow mask is obtained having a larger guard band in the critical places on the display screen (5).

386530

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