Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1976-11-11
1977-12-20
Murray, Richard
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
328270, 358 29, 358190, H05B 4136
Patent
active
040644170
ABSTRACT:
The invention pertains to a video display apparatus which includes a cathode ray tube having at least one electron gun and means for deriving a source of excitatory voltage signal representative of picture information. In accordance with the invention there is provided a system for stabilizing the display intensity attributable to the electron gun comprising means coupling the source of voltage signal to the gun for generating a stabilized current in the gun, the level of current in the gun being substantially independent of variations in the operating characteristics of the gun. In the preferred embodiment of the invention a test signal is periodically applied at a predetermined level to the gun. A sampler samples the beam current of the gun during the test signal and generates a correction signal in accordance with the sample value. The correction signal is applied to the electron gun so as to stabilize its reference current level.
REFERENCES:
patent: 2455387 (1948-12-01), Sippel
patent: 3479449 (1969-11-01), Campbell
Murray Richard
Novack Martin
Thomson-CSF Laboratories, Inc.
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