Device for measuring convergence of color cathode ray tube

Details Device for measuring convergence of color cathode ray tube Device for measuring convergence of color cathode ray tube

1988-10-14

1991-07-02

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358139, G09G 104, H04N 1700

Patent

active

050288490

ABSTRACT:
A device for measuring convergence of color cathode ray tube including means for producing a white measurement pattern on a viewing screen of the color cathode ray tube, a color image pickup device for picking up the white measurement pattern on the viewing screen, a memory unit for storing color signals transmitted from the color image pickup device, a discrimination unit for discriminating which of blue, green, and red phosphors glows every picture elements of the color image pickup device based on signals from adjacent picture elements, and a calculation unit for a finding out a misconvergence from discriminated results assures an accurate convergence measurement by one time of image pickup only.

REFERENCES:
patent: 3804531 (1974-04-01), Kosaka et al.
patent: 4593309 (1986-06-01), Uno et al.
patent: 4642529 (1987-02-01), Penn
patent: 4686429 (1987-08-01), Fendley
patent: 4746970 (1988-05-01), Hosokawa et al.

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