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test patterns
convergence
Many display devices form white by generating a mixture of the
primary colours red, green and blue which our eyes add to
white. If these colours aren’t hitting exactly the same spot they
won't form perfect white. This is called imperfect ‘convergence’
Convergence of some display devices, primarily projectors, can
be user adjusted, others will need a service engineer or aren’t
adjustable at all. The quality of the convergence can be checked
using any of the
aspect ratio
test patterns as they show white lines
on a black background.
If the white lines aren’t white but show the prime colours, shifted
against each other, then the convergence need adjustment.
Press
menu
to exit from
test-patterns
or
return
to go back a menu.
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