Method of determining a display parameter in a picture display t

Details Method of determining a display parameter in a picture display t Method of determining a display parameter in a picture display t

1991-08-16

1992-05-05

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

With radiant energy sensitive control means

315382, 358 10, 358 69, H04N 1702

Patent

active

051111101

ABSTRACT:
A method of determining display parameters of an electron beam picture tube. An image pattern is produced on the display screen of the tube by frequency modulating the electron beam. The frequency component of the image pattern having a frequency equal to the beam modulation frequency, that being the fundamental wave of the pattern, is determined. Information about the sharpness of focus can be derived from the modulation depth of the fundamental wave, and information about the position of the electron beam and raster distortion can be derived from the phase of the fundamental wave.

REFERENCES:
patent: 4193086 (1980-03-01), Kawaguchi
patent: 4263614 (1981-04-01), Tominaga
patent: 4364083 (1982-12-01), Isono et al.
patent: 4387394 (1983-06-01), Powell
patent: 4814669 (1989-03-01), Herrmann et al.

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