CRT color convergence measurement

Details CRT color convergence measurement CRT color convergence measurement

1985-12-11

1987-08-11

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358 67, 358 69, H01J 2970, H04N 924

Patent

active

046864296

ABSTRACT:
A computer controlled system for measuring convergence in a multi-electron beam color cathode ray tube (CRT) provides a high speed coarse search and fine search sequence for locating the position of incidence of the electron beams on the CRT's faceplate. The coarse search involves a binary, step-wise procedure wherein a first half of the CRT's faceplate is illuminated by the electron beams with the remaining half of the faceplate then subjected to a divide-by-two binary search procedure which continues with the remaining CRT area halved at each subsequent step until resolution of electron beam position is determined to within approximately 2 horizontal and vertical lines by a photodetector whereupon the fine search procedure is automatically initiated. The fine search procedure involves the electronic position stepping of line images upon a quadrant type or otherwise split photodetector. Defocusing of these colored line images causes an overlapping of the individual phosphor dot or pixel images on the detector, distributes the thus presented image over a greater area and smooths the blurred image, thus minimizing measurement errors arising from the discontinuous nature of the array of illuminated phosphor dots.

REFERENCES:
patent: 4220897 (1980-09-01), Barten et al.
patent: 4291256 (1981-09-01), Garwin
patent: 4316211 (1982-02-01), Mackey et al.
patent: 4318032 (1982-03-01), Kureha
patent: 4364079 (1982-12-01), Pons

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