Patent ID: 6330040
Filing Date: 2001-12-11
Classification: H04N

Abstract:
Apparatus for performing convergence calibration in a system using multiple light beams to generate a video display on a screen, comprising:means for generating a first beam of light at a first wavelength;means for generating a second beam of light at a second wavelength, the second wavelength being different than the first wavelength;means for sensing said first and second light beams and producing output signals in response to said first and second light beams;means for filtering the output signals from the sensing means, said filtering means having first filter characteristics and second filter characteristics, said first filter characteristics being chosen based on the frequency content of the output of said sensing means produced in response to said first light beam, and said second filter characteristics being chosen based on the frequency content of the output of said sensing means produced in response to said second light beam; andmeans for controlling said filter means to switch between said first filter characteristics and said second filter characteristics.