Cathode-ray tube display apparatus

Details Cathode-ray tube display apparatus Cathode-ray tube display apparatus

1979-06-05

1981-06-16

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340793, G08B 536

Patent

active

042740940

ABSTRACT:
Provided in a video amplifier circuit in accordance with the present invention is a first switching element which receives input video signals and makes a switching action, a second switching element which receives input dual intensity signals for shifting the intensity level of selected parts of the images, and a video signal amplifying stage. Also provided is a variable voltage feeding circuit, a power supply terminal, a transistor connected by its collector substantially to said power supply terminal and by its emitter to an output terminal of said first switching element and to an input terminal of said video signal amplifier stage, a diode connected between a variable voltage output terminal of said variable voltage feeding circuit and the base of said transistor in the direction backward to that of the base current of said transistor and a base resistor connected to said base to feed the base current of said transistor whereby the display intensity of the accentuated brighter characters is made free from adjustment setting of the display intensity of the non-accentuated characters and the highest display intensity of the non-accentuated characters is made the same as that of the accentuated characters.

REFERENCES:
patent: 2997620 (1961-08-01), Katzmann
patent: 3336587 (1967-08-01), Brown
patent: 3473082 (1969-10-01), Kolodnyckij
patent: 4177409 (1979-12-01), Chamberlin

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