Automatic beam current limit apparatus and methods of the same

Details Automatic beam current limit apparatus and methods of the same Automatic beam current limit apparatus and methods of the same

1997-05-22

1999-03-30

Kostak, Victor R.

Television

Cathode-ray tube display beam current control

348173, H04N 568

Patent

active

058895574

ABSTRACT:
An automatic beam current limiting apparatus for limiting beam currents of R, G, and B colors separately without affecting the the CRT drive. In particular, the Average Picture Level (APL) of each of the R, G, and B color video signals at the preceding stage of a video power amplifier is detected and compared with a reference voltage. When the APL of the video signal is higher than the reference voltage, the amplitude of the video signal is controlled to limit the beam current driving the CRT. In addition, the G1 voltage, and G2 voltage may be compared with a reference voltage and a result calculated by the APL calculating circuit. When the result is higher than the reference voltage, the amplitude of the video signal is controlled to limit the beam current driving the CRT.

REFERENCES:
patent: 3735029 (1973-05-01), Sunstein
patent: 4096518 (1978-06-01), Tuma
patent: 4253127 (1981-02-01), Avery
patent: 4562479 (1985-12-01), McDonald
patent: 5200829 (1993-04-01), Lagoni
patent: 5313294 (1994-05-01), Haferl
patent: 5589883 (1996-12-01), Ogino

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