COLOR DISPLAY DEVICE HAVING QUADRUPOLE CONVERGENCE COILS

摘要

The invention relates to a color display device comprising an in-line electron gun (5) for generating three electron beams (6, 7, 8), a deflection unit (51) for deflecting the electron beams (6, 7, 8) and a convergence unit (14') for dynamically influencing the convergence of the electron beams. A variable transformer (40) is connected between the convergence unit (14') and the deflection unit (51) for compensating undesired voltages induced by the deflection unit (51). The variable transformer (40) comprises three coils (47, 48, 49) wound around a hollow coil holder (43) and an adjustable core (42), which moves within the coil holder.