Device for measuring a characteristic of a color cathode ray tub

Details Device for measuring a characteristic of a color cathode ray tub Device for measuring a characteristic of a color cathode ray tub

1989-12-22

1991-09-17

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358 10, 358139, G09G 128, H01J 2951, H04N 1702

Patent

active

050497910

ABSTRACT:
A device for measuring convergence of a color CRT including image pickup means for producing three color image signals with respect to three color test patterns constituting a composite test pattern presented on a viewing screen of a color CRT, change means for changing the image magnification of said image pickup means according to the pitch between color phosphor elements on the viewing screen, and calculation means for calculating respective luminous centers of gravity of the three color test patterns from the three color image signals, and calculating a misconvergence of the color CRT from the calculated luminous centers of gravity and a changed image magnification.

REFERENCES:
patent: 4593309 (1986-06-01), Uno et al.
patent: 4686429 (1987-08-01), Fendley

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