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US 4,070,691 AGranted
Stabilizing system for cathode ray tube
AssigneeThomson-CSF Laboratories, Inc.
InventorsClyde Smith, Renville H. McMann
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AssigneeThomson-CSF Laboratories, Inc.
InventorsClyde Smith, Renville H. McMann
Estimating the term…
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 an embodiment of the invention, there is provided a system for stabilizing the display intensity of the electron gun comprising means for amplifying the voltage signal and a constant current means including resistive means coupling the amplified voltage signal to the cathode of said electron gun, the resistive means having an impedance which is substantially greater than the input impedance of the cathode. In another embodiment of the invention, amplifier means are provided for applying the excitatory voltage signal to a control grid of the electron gun and a feedback signal generating means is provided for sensing the beam current of the electron gun and generating a feedback signal as a function of the sensed current. The amplifier means is modulated in accordance with the generated feedback signal.
In 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 a video display apparatus which includes a cathode ray tube having a plurality of electron guns and means for deriving a respective plurality of excitatory voltage signals representative of color picture information;
Dependencies are inferred from the claim text.