摘要 |
A cathode ray tube comprises an electron gun (10) with a main lens (ML) section and a triode section. The triode section (T) comprises a first (G1), second (G2) and third (G3) electrode, the first electrode facing a cathode. The triode section is arranged such that in operation a cross-over (X) in the electron beam is formed in the frame (y) direction, while no cross-over is formed in the line (x) direction. The first electrode (G1) has an elongated aperture facing the cathode having an aspect ratio (y/x) between 0.35 and 0.60 (0.35≤y(G1)/x(G1)≤0.6). The second electrode (G2) has an aperture facing the first electrode triode wherein x(G2A)<x(G1) and y(G2A)>y(G1) and the dimension of the electron beam in the main lens portion in the frame (y) direction is less than 1/2 of the dimension of the electron beam in the line (x) direction (y(ML)/x((ML)≤0.5). <IMAGE> |