Color display tube having a reduced deflection defocusing

Details Color display tube having a reduced deflection defocusing Color display tube having a reduced deflection defocusing

1997-01-02

1999-03-30

O'Shea, Sandra

Electric lamp and discharge devices

Cathode ray tube

Electron permeable window

313403, 313477R, H01J 3300, H01J 2980, H01J 3100

Patent

active

058893628

ABSTRACT:
Color display tube comprising an in-line electron gun, a self-convergent deflection coil, a shadow mask having a pattern of apertures and a display screen having a pattern of phosphor dots. The aperture pattern consists of apertures arranged in vertical rows with a substantially equal vertical aperture spacing between the centers of each pair of consecutive apertures in each row. The vertical rows of apertures are alternately staggered through half the vertical aperture spacing. The electron gun generates three electron beams in the vertical plane through the axis of the color display tube. The phosphor dots are arranged in vertical triplets. Both the apertures and the phosphor dots are horizontally elongated. The horizontal spacing between the vertical rows of apertures is preferably smaller than 1/2*.sqroot.3 times the vertical aperture spacing. A better definition due to a reduced deflection defocusing is achieved with this color display tube, without Moire phenomena occurring.

REFERENCES:
patent: 3777204 (1973-12-01), Robbins et al.
patent: 5055736 (1991-10-01), Yun et al.
patent: 5099169 (1992-03-01), Vriens
patent: 5170102 (1992-12-01), Sluyterman et al.
"The 20AX System and Picture Tube", by P.G.J. Barten, IEEE Trans. On Broadcast and TV Receiver, vol. 20, No. 4, pp. 286-292, Nov. 1974.
"Theorie des Moire bei Schattenmasken-Farbbildrohren", by P.G.J. Barten, Valvo Berichte, vol. 15, No. 3, pp. 79-92, Nov. 1969.

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