Method of measuring color purity of color display and apparatus

Details Method of measuring color purity of color display and apparatus Method of measuring color purity of color display and apparatus

1988-04-06

1989-03-21

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

313430, 315368, 324404, 358903, H04N 1702, H04N 1704

Patent

active

048148580

ABSTRACT:
Disclosed are a method of measuring the color purity of a color display having phosphors in the shape of dots and an apparatus therefor which are capable of quantitatively measuring the state of the phosphors being irradiated with electron beams with high accuracy. Magnetic field is applied to the color display tube from the outside so as to forcibly move an electron beam deflectively along a straight line and a photograph of the phosphor in this state is taken so as to obtain the configuration (the center position, and the radius or the diameter) of the phosphor from the image of the phosphor. After the two center positions of the electron beams in the positive and negative directions of the external magnetic field are then obtained, the center position of the electron beam under no excitation is obtained as the interior division point.

REFERENCES:
patent: 4636694 (1987-01-01), De Paolis
patent: 4642529 (1987-02-01), Penn
patent: 4688079 (1987-08-01), Fendley
patent: 4709191 (1987-11-01), Pieri
patent: 4725763 (1988-02-01), Okuyama
patent: 4754204 (1988-06-01), Ando
Toshiba Review, vol. 36, No. 3 (1981) pp. 241-244 "Automatic Adjustment for CPT Picture Quality-Uno."
Automizing Technique, vol. 18, No. 8 (1986), pp. 49-55, "Automatic Measurement for Display Color Purity using Color TV Camera"--Nakao.

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