Color picture tube with reduced primary and secondary moire

Details Color picture tube with reduced primary and secondary moire Color picture tube with reduced primary and secondary moire

H - Electricity

01

J

H01J 29/07 (2006.01)

Patent

CA 2139093

An improved color picture tube, operable in a multistandard television receiver, includes a viewing screen, a shadow mask and an electron gun for generating and projecting three electron beams through the shadow mask and onto the screen. The screen comprises phosphor lines that extend in a first direction. The electron beams are subject to deflection in the first direction and in a second direction, that is substantially perpendicular to both the first direction and the phosphor lines. The shadow mask includes elongated slit-shaped apertures that are aligned in columns that substantially parallel the phosphor lines. The adjacent apertures in each column are separated from each other by tie-bars in the mask, and the tie-bars in one column are offset from the tie-bars in adjacent columns in the first direction. The improvement comprises the tie-bars in alternate columns lying on substantially straight lines that form an angle of approximately 2 degrees with respect to the second direction.

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