Display tube for displaying color pictures

Details Display tube for displaying color pictures Display tube for displaying color pictures

1979-02-05

1982-08-24

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, H01J 2951, H01J 2976

Patent

active

043463274

ABSTRACT:
Because the deflection fields in color television display tubes on the display screen side often have a pin-cushion-shaped and barrel-shaped field distribution, a defocusing of the electron beams occurs upon deflection. By forming the barrel-shaped deflection field on the display screen side of the display tube so as to be pin-cushion-shaped on the neck side near each electron beam and simultaneously deforming the deflection field which is pin-cushion-shaped on the display screen side of the display tube so as to be barrel-shaped on the neck side near each electron beam, the effects of said defocusing of the electron beams as a result of the deflection are considerably reduced. The haze occurring in the vertical direction is also reduced.

REFERENCES:
patent: 3772554 (1973-11-01), Hughes
patent: 3866080 (1975-02-01), Barkow
patent: 3984723 (1976-10-01), Gross et al.
patent: 4057747 (1977-11-01), Hamand

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