Patent ID: 6630803
Filing Date: 2003-10-07
Classification: H01J

Abstract:
A color display device comprisingan in-line electron gun (5) for generating three electron beams (6, 7, 8), deflecting means (51) for deflecting the electron beams (6, 7, 8), and convergence means (14â€²) for dynamically influencing a convergence of the electron beams, the convergence means (14â€²) comprising a ring-shaped element (21â€²), characterized in that said ring-shaped element (21â€²) comprises two parts (60, 68), a first part (60) being positioned closer to the in-line electron gun (5) than a second part (68), and the first part (60) and/or the second (68) part having four coils (22â€²) for generating a magnetic quadrupole field.