U.S. Philips Corporation

Leonardus A Elshof

Herman F Van Heek

Constant J Geenen

A color display tube of the 'in-line' type includes a shadow mask having means for producing generally elliptical equitransmission factor curves.

Color display tube

The bridges between apertures located at the edge of the shadow mask of a color display tube are made at least 20% wider than the others. The width of the bridges increases linearly from row to row from the center to the edge of the mask whereby a continuously varying brightness distribution is obtained. The reproduction mask used in the fabrication of such a shadow mask can be made photographically by exposing photosensitive material through a pattern of bridges, rotating the pattern and repeating the exposure.

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Eindhoven, Netherlands

Leonardus A Elshof