Method for correcting the convergence in a projection television receiver

摘要

In a projection television receiver, it is known to use a grating pattern to define on the picture screen a multiplicity of intersection points for which convergence correction values are determined, digitally stored and used during reproduction for the purpose of correcting the convergence. It is the object to reduce the outlay on time for such a correction in preduction or at the client's and, in addition, to improve the convergence correction at the picture edges. Firstly a precorrection or coarse correction is undertaken in the laboratory or in the pilot series using a first matrix with a fine grating pattern with correction values for all the receivers of a specific receiver type in order to determine initial values. Subsequently a final correction or fine correction is carried out in the series production individually for each receiver using a second matrix with a coarse grating pattern. In particular, a method for correcting the convergence in a projection television receiver with automatic convergence correction. <IMAGE> <IMAGE>