Television – Video display – Cathode-ray tube
Patent
1994-08-16
1995-12-05
Kostak, Victor R.
Television
Video display
Cathode-ray tube
348190, 31536812, H04N 978
Patent
active
054733944
ABSTRACT:
A convergence measurement apparatus for a color cathode-ray tube is capable of high precision convergence measurement by elimination of luminance omission portions occurring in the screen. A dot pattern displayed on a color cathode-ray tube is picked up by an image pickup camera and is stored in an image memory. A signal movement amount control unit is arranged to move a beam spot of the dot pattern displayed on the cathode-ray tube by a predetermined pitch in a horizontal or vertical direction. Corresponding dot pattern shifting occurs to sequentially record images of discrete colors for a more accurate measure of convergence. For example, if a gap between adjacent phosphor elements of one color (for example red) is defined as one pitch, three sequential red dot patterns can be each shifted by 1/3 of a pitch and thereafter picked up and stored in the image memory of dot pattern data. An image synthesizing means retains the dot pattern data sequentially gathered by the corresponding movement amounts and synthesizes them to obtain a composite red image. The process is repeated for green and blue dot patterns data. A convergence amount is obtained from a shift amount of the center of gravity of the luminance distribution of the synthesized pattern data of each color component and is displayed on a display unit.
REFERENCES:
patent: 4316211 (1982-02-01), Mackey et al.
patent: 4364079 (1982-12-01), Pons
patent: 4441120 (1984-04-01), Gerritsen
patent: 4602272 (1986-07-01), Duschl
patent: 4686429 (1987-08-01), Fendley
patent: 4688079 (1987-08-01), Fendley
patent: 4814669 (1989-03-01), Herrmann et al.
patent: 4814858 (1989-03-01), Mochizuki et al.
patent: 4857998 (1989-08-01), Tsujihara et al.
patent: 4925420 (1990-05-01), Fourche et al.
patent: 5032769 (1991-02-01), Kawakami
patent: 5049791 (1991-09-01), Kawakami
patent: 5111110 (1992-05-01), Houben
patent: 5159436 (1992-10-01), Soneira
Kostak Victor R.
Murata Mfg. Co. Ltd.
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