Reducing moire is an important consideration in CRT design. This paper aims
to investigate how the visibility of the inverse-phase raster moire, a typ
ical pattern of the raster moire, is influenced by the distribution of the
electron beam and the structure of shadow mask apertures. First, a simple m
odel based on the luminance distribution on the CRT screen and characterist
ics of the human vision was used to calculate the perceived intensity of th
e inverse-phase raster moire. This calculation was made to examine the effe
ct of model parameters. It showed that the inverse-phase raster moire consi
sts of (1,1)-order moire components. It was also found that the perceived i
ntensity increases with a decrease in electron beam diameter and with an in
crease in horizontal aperture pitch. In addition, a subjective evaluation t
est was conducted using an inverse-phase moire pattern reproduced by the im
age simulation. Test results agreed with the calculated results. Finally, i
t was revealed that when an electron beam shape having a Gauss distribution
was used, most of the raster moire is the inverse-phase raster moire cause
d by the (1,1)-order component, while the (2,2)-order moire component was v
ery low.