Patent ID: 6111616
Filing Date: 2000-08-29
Classification: H04N

Abstract:
A method for correcting convergence in projection television receivers having monochromatic picture tubes for displaying images on a screen, comprising the steps of:defining a first number of intersection points according to a first screen grid pattern;storing in said receiver digital coarse convergence correction values, attributed to said first number of intersection points and appropriate for a group of said receivers;displaying on a specific one of said receivers a second number of intersection points on said screen according to a second screen grid pattern, using a smaller number of said intersection points in said second screen grid pattern than in said first screen grid pattern;attributing digital fine convergence correction values to said smaller number of said intersection points of said second grid pattern for fine convergence correction;combining said digital fine correction values with said digital coarse correction values; and,digitally storing in said one specific receiver said combined fine and coarse convergence correction values.