Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1975-04-28
1978-01-24
Martin, John C.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358242, 358 65, H04N 9535, H04N 568
Patent
active
040706915
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.
REFERENCES:
patent: 2938946 (1960-05-01), Macovski
patent: 3334180 (1967-08-01), Loughlin
patent: 3541240 (1970-11-01), Curtis
patent: 3588328 (1971-06-01), Verhoeven et al.
patent: 3619705 (1971-11-01), Waybright
patent: 3855614 (1974-12-01), Okada
patent: 3873767 (1975-03-01), Okada et al.
McMann Renville H.
Smith Clyde
Martin John C.
Novack Martin
Psitos Aristotelis M.
Thomson-CSF Laboratories, Inc.
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