Color display device including electron beam deflection arrangement for landing-correction

A color display device comprising a color display tube having an axis, said tube including:

• a. an electron gun for producing a central first electron beam and outer second and third electron beams;
• b. a screen having respective areas for luminescing in first, second and third colors when impinged upon by respective ones of the first, second and third electron beams;
• c. an apertured shadow mask disposed adjacent the screen;
• d. a deflection coil arrangement for deflecting the electron beams across the shadow mask;
• e. correction means, including at least one correction coil arrangement, for affecting the respective angles at which the first, second and third electron beams pass through the shadow mask to correct beam-landing errors at the screen and where, in operation, the deflection coil arrangement defines a deflection plane, said correction means comprising:
• a. a first correction coil arrangement disposed for deflecting the electron beams away from the axis before entering the deflection plane;
• and
• b. a second correction coil arrangement disposed for deflecting the electron beams toward the axis after leaving the deflection plane.

A color display tube having an axis and comprising:

• an electron gun for generating first, second and third electron beams,
• a screen having respective areas for luminescing in first, second and third colors when impinged upon by respective ones of the first, second and third electron beams,
• an apertured shadow mask disposed adjacent the screen and interpositioned between the electron gun and the screen,
• a deflection coil arrangement on the display tube for deflecting the electron beams across the shadow mask, and
• correction means for correcting beam-landing errors, wherein the correction means comprises a correction deflection system for generating a magnetic field transversely to the axis of the color display tube for correcting beam-landing errors by influencing the respective angles at which the first, second and third electron beams pass through the shadow mask, and means for correcting errors introduced by the correction deflection system;
• said correction means comprising first and second x-correction deflection devices arranged one behind the other in the direction of the tube axis and energizeable in opposite senses so that the first correction deflection device generates a dipole field for deflecting the three electron beams away from the tube axis, and the second x-correction deflection device generates a dipole field for deflecting the three electron beams toward the tube axis, or conversely.

A color display tube having an axis and comprising:

• an electron gun for generating first, second and third electron beams,
• a screen having respective areas for luminescing in first, second and third colors when impinged upon by respective ones of the first, second and third electron beams,
• an apertured shadow mask disposed adjacent the screen and interpositioned between the electron gun and the screen,
• a deflection coil arrangement on the display tube for deflecting the electron beams across the shadow mask, and
• correction means for correcting beam-landing errors, wherein the correction means comprises a correction deflection system for generating a magnetic field transversely to the axis of the color display tube for correcting beam-landing errors by influencing the respective angles at which the first, second and third electron beams pass through the shadow mask, and means for correcting errors introduced by the correction deflection system;
• said electron beams defining an in-line plane, and said correction means comprising first and second y-correction deflection devices which are arranged one behind the other in the direction of the tube axis and energizeable in opposite senses so that the first y-correction deflection device generates a dipole field for deflecting the three electron beams away from the in-line plane, and the second y-correction deflection device generates a dipole field for deflecting the three electron beams towards the in-line plane, or conversely.

A color display tube having an axis and comprising:

• an electron gun for generating first, second and third electron beams,
• a screen having respective areas for luminescing in first, second and third colors when impinged upon by respective ones of the first, second and third electron beams,
• an apertured shadow mask disposed adjacent the screen and interpositioned between the electron gun and the screen,
• a deflection coil arrangement on the display tube for deflecting the electron beams across the shadow mask, and
• correction means for correcting beam-landing errors, wherein the correction means comprises a correction deflection system for generating a magnetic field transversely to the axis of the color display tube for correcting beam-landing errors by influencing the respective angles at which the first, second and third electron beams pass through the shadow mask, and means for correcting errors introduced by the correction deflection system;
• said correction means comprising:
• an x-correction deflection device comprising a dipole coil device, and wherein
• the deflection coil arrangement includes a line deflection coil in which the current flow therein receives an extra modulation such that the line deflection coil operates as a further correction deflection device for the three electron beams.

A color display tube having an axis and comprising:

• an electron gun for generating first, second and third electron beams,
• a screen having respective areas for luminescing in first, second and third colors when impinged upon by respective ones of the first, second and third electron beams,
• an apertured shadow mask disposed adjacent the screen and interpositioned between the electron gun and the screen,
• a deflection coil arrangement on the display tube for deflecting the electron beams across the shadow mask, and
• correction means for correcting beam-landing errors, wherein the correction means comprises a correction deflection system for generating a magnetic field transversely to the axis of the color display tube for correcting beam-landing errors by influencing the respective angles at which the first, second and third electron beams pass through the shadow mask, and means for correcting errors introduced by the correction deflection system;
• said correction means comprising:
• a y-correction deflection device comprising a dipole coil device, and wherein
• the deflection coil arrangement includes a field deflection coil in which the current flow therein receives an extra modulation such that the field deflection coil operates as a further correction deflection device for the three electron beams.