Color display system with dynamically varied beam spacing

Details Color display system with dynamically varied beam spacing Color display system with dynamically varied beam spacing

1988-05-05

1989-09-05

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315368, H01J 2956

Patent

active

048641952

ABSTRACT:
The improved color display system includes a cathode-ray tube and a magnetic deflection yoke positioned on the tube. The tube includes a faceplate having a phosphor screen thereon; a shadow mask adjacent to said screen; and an electron gun for generating three electron beams, a center and two side beams, and directing the beams along paths through the yoke toward the mask and screen. The yoke forms a magnetic deflection field for scanning the electron beams vertically and in horizontal lines across the screen. The improvement comprises the combination of two features. First, the mask has greater curvature than the faceplate, with the spacing between the mask and screen increasing from the center to the sides of the mask in the horizontal scan direction. Second, means are included for dynamically varying the spacing between the side beams and the center beam in inverse relation to the variation in mask-to-screen spacing during each horizontal scan line of the electron beams.

REFERENCES:
patent: 2907915 (1959-10-01), Gleichauf
patent: 2923844 (1960-02-01), Gundert
patent: 3430099 (1969-02-01), Ashley
patent: 3553523 (1971-01-01), Budd
patent: 4136300 (1979-01-01), Morrell
patent: 4214188 (1980-07-01), Bafaro et al.
patent: 4258298 (1981-03-01), Hilburn et al.
patent: 4316128 (1982-02-01), Shiratsuchi

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