Color CRT purity measurement

Details Color CRT purity measurement Color CRT purity measurement

1986-08-05

1987-08-18

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358139, H04N 1704

Patent

active

046880798

ABSTRACT:
In a color cathode ray tube (CRT) having three electron beams each incident upon a respective primary color phosphor dot of red, green or blue, wherein the color dots are arranged in spaced, periodic groups of three dots, color purity which is determined by the accuracy with which each electron beam impacts its associated phosphor dots is measured by an adaptive process which measures six electron beam deflection vectors from which a beam landing calibration vector may be determined to correct for electron beam misalignment. After measuring beam landing error for each of the three electron beams, the center electron beam is deflected either right or left as determined by its previously measured beam landing error to the nearer of the two remaining dots. The electron beam associated with the remaining dot is then laterally displaced to the center dot. The center electron beam is then deflected either upward or downward to an adjacent dot of one of the two other colors in an immediately adjacent row to provide a sixth deflection vector. The known periodicity of the phosphor dots together with light intensity measurements permit the six deflection vectors to be used to calculate a calibration vector in terms of deflection units (distance) per unit of magnetic deflection coil current for accurate positioning of each electron beam upon its respective color dots for improved lens design or magnetic yoke deflection corrections and enhanced video image color purity.

REFERENCES:
patent: 4201932 (1980-05-01), Smith
patent: 4439735 (1984-03-01), Alvite
patent: 4642529 (1987-02-01), Penn

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