Patent ID: 6424084
Filing Date: 2002-07-23
Classification: G09G,H01J

Abstract:
A cathode ray tube comprising:an electron gun assembly having an electron beam forming portion for forming and emitting at least one electron beam and a main electron lens portion for accelerating and focusing the at least one electron beam; and a deflection yoke for generating a deflecting magnetic field for deflecting the at least one electron beam emitted by said electron gun assembly and scanning a screen in vertical and horizontal directions, the main electron lens portion having a plurality of electrode structures arranged in a traveling direction of the at least one electron beam; wherein a substantially increasing voltage distribution is applied to the plurality of electrode structures, including first and second dynamic voltages applied to respective electrode structures of said plurality of electrode structures, the relative arrangement of said plurality of electrode structures and the application of the substantially continuously increasing voltage distribution thereon causing there to be formed an asymmetrical lens between respective electrode structures configured to apply horizontal and vertical focusing forces on the at least one electron beam, the horizontal and vertical focusing forces having respective varying magnitudes; and wherein a lens action of the asymmetrical lens providing the horizontal and vertical focusing forces changes in synchronism with the deflecting magnetic field.