Title:
【発明の名称】ピーク振幅に応動する閾値を有するビーム電流制限構成
Document Type and Number:
Japanese Patent JP3354570
Kind Code:
B2
Abstract:
An automatic beam current limiting arrangement of a television receiver or display monitor comprises an average beam current limiter (70a) coupled to the low side of the high voltage transformer (50) for reducing the contrast of a reproduced image when the average beam current exceeds a threshold and a peak current limiter (70b) coupled to the cathodes of the picture tube (40) for controlling a current source (110) which determines the threshold of the average beam current limiter (70a) in response to the sum of the cathode currents of the picture tube. In one embodiment, the cathode current sensing circuits comprise the same cathode current sensing circuits utilized in an automatic black level setting arrangement. This beam limiting arrangement allows operation at high contrast levels while inhibiting excessive peak white areas.
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Inventors:
Hafar, Peter Edwalt
Application Number:
JP50857291A
Publication Date:
December 09, 2002
Filing Date:
March 19, 1991
Export Citation:
Assignee:
RCS Thomson Licensing Corporation
International Classes:
H04N3/20; H04N3/18; H04N5/57; H04N5/59; H04N9/64; (IPC1-7): H04N5/59
Domestic Patent References:
| JP63171074A | ||||
| JP54116832A | ||||
| JP1261087A | ||||
| JP60236378A | ||||
| JP6178485U |
Attorney, Agent or Firm:
Hiroshi Tanaka (2 outside)