Automatic cut-off system

Details Automatic cut-off system Automatic cut-off system

2005-11-29

2005-11-29

Lee, Michael H. (Department: 2614)

Television

Cathode-ray tube display beam current control

C315S383000

Reexamination Certificate

active

06970203

ABSTRACT:
The automatic cut-off system includes a video data processing circuit, a cut-off control circuit, a drive circuit, and a level control section. The video data processing circuit adds a cut-off reference pulse having a predetermined level to primary-color signals of red (R), green (G) and blue (B) at different timings within a single vertical blanking interval, and outputs latch timing signals respectively indicating the timings. The cut-off control circuit shifts a level of each primary-color signal having the cut-off reference pulse added thereto based on a corresponding cut-off control signal. The drive circuit drives each cathode of a CRT (cathode-ray tube) based on a corresponding one of the shifted primary-color signals, and outputs a voltage corresponding to each cathode current as a common feedback signal. The level control section latches the feedback signal in response to each latch timing signal, and outputs the cut-off control signal of one of the primary-color signals.

REFERENCES:
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patent: 4599642 (1986-07-01), Willis
patent: 5339011 (1994-08-01), Tamura et al.
patent: 5714842 (1998-02-01), Krause et al.
patent: 6288503 (2001-09-01), Sowig
patent: 2000316104 (2000-11-01), None

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