Display device and cathode ray tube

Details Display device and cathode ray tube Display device and cathode ray tube

1992-04-13

1994-09-13

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 15, 313414, 313444, G09G 104, H01J 2946, H01J 2950

Patent

active

053472020

ABSTRACT:
A display device comprising a deflection unit and a cathode ray tube having an in-line electron gun. The electron gun comprises a main lens portion having means to generate a main lens field and a quadrupole field. During operation, the intensity of the fields is dynamically varied. The electron gun comprises a prefocusing lens portion having means of generating a prefocusing lens field and a further quadrupole field. During operation, the intensity of said fields is controlled so that a dynamic cylindrical lens is formed in the prefocusing lens portion. By virtue thereof, an improved picture reproduction can be obtained.

REFERENCES:
patent: 4764704 (1988-08-01), New et al.
patent: 4877998 (1989-10-01), Maninger et al.
patent: 4935663 (1990-06-01), Shimona et al.
patent: 5142190 (1992-08-01), Koh
patent: 5162695 (1992-11-01), Shimona et al.

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