The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 1978
Filed:
Apr. 28, 1975
Clyde Smith, North Salem, NY (US);
Renville H McMann, New Canaan, CT (US);
Thomson-CSF Laboratories, Inc., Stamford, CT (US);
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 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.