An apparatus and method for controlling a convergence of a projection
television includes a pattern generator which generates R, G, and B video
patterns used for controlling the convergence and then outputs the R, G,
and B video patterns to a display, and a controller which compares
position coordinates and luminance levels of the R, G, and B video
patterns with position coordinates and luminance levels of reference R,
G, and B video patterns to adjust the luminance levels of the R, G, and B
video patterns to the luminance levels of the reference R, G, and B video
patterns.