Color cathode ray tube display device and method of adjusting color purity in the display device
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United States of America Patent
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Sep 1, 1998
Grant Date -
N/A
app pub date -
Feb 1, 1996
filing date -
Aug 9, 1995
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Abstract
A color cathode ray tube display device has a cathode ray tube 1, a convergence purity assembly 10 mounted on a neck portion 29 of the tube 1 at a position behind a deflection yoke 8, a two pole coil unit 12 near the convergence purity assembly 10 to form a two pole magnetic field, a purity coil 13 wound around a cathode ray tube panel 3, and current supplying circuits 15 for supplying currents each being in synchronism with a vertical or horizontal deflection current. It further has a distributing device which detects portions of mislanding on the picture plane by the aid of another device and analyzes a result of the detection, and current control circuits 16 for controlling the currents to the two pole coil unit 12 and the purity coil 13 in accordance with an instruction from the distributing device. Mislanding can be corrected by adjusting the currents to the two pole coil unit 12 and the purity coil 13 in addition to adjustment of a ring 103 of the convergence purity assembly 10 and adjustment of a mounted position of the deflection yoke 8. Quantities to be adjusted are indicated by the distributing device, and therefore, an adjusting work for ITC can be easy.
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