PURPOSE

These notes provide means of analyzing the effect of pulse shape on the written spot configuration and its relative brightness in raster-dot displays. The observations noted and the application of the methods described will provide the equipment designer with better insight into pulse shape limitations, observed spot size, spot shapes and their luminance distributions as well as variations resulting from changes in the applied drive-voltage levels in a particular tube design. The subject discussed is becoming increasingly important due to the demands for higher resolution and increased writing speeds.

It will be shown that after the luminance and line width characteristics of a given CRT design in terms of the drive voltage have been established, the spot shape and its luminance distribution can be synthesized for any pulse shape at a given set of operating conditions.