Patent ID: 6376981
Filing Date: 2002-04-23
Classification: H01J

Abstract:
A color display device comprisingan in-line electron gun for generating three electron beams being located substantially within a plane extending in an X-direction of a rectangular X-Y coordinate system, deflecting means for deflecting the electron beams, and convergence means for dynamically influencing a convergence of the electron beams, the convergence means comprising a ring-shaped element having four coils and a longitudinal axis , a cross-section of the ring-shaped element with a plane perpendicular to the longitudinal axis being a circle with the longitudinal axis as its center and the ring-shaped element forming a circumference of the circle, each coil being disposed at the circumference and extending over an angle &agr; over the circumference, the angle &agr; having a value between 50Â° and 75Â°.