发明名称 |
Vertical deflection circuit with raster correction |
摘要 |
An electron beam tends to slope downwardly as it is deflected horizontally to form a raster in a video display apparatus. The sloping of the beam can cause geometric errors in the raster, for example orthogonality and parallelogram errors. A raster correction circuit substantially offsets the downward slope of the electron beam by modulating a vertical deflection current with an induced horizontal-rate raster correction current, thereby substantially eliminating orthogonality and parallelogram errors in the raster. In respective embodiments of an inventive arrangement taught herein, the horizontal-rate raster correction current is induced in the vertical deflection coils by magnetically coupling a filament pulse waveform, a horizontal deflection voltage waveform, or a horizontal deflection current into the vertical deflection coils.
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申请公布号 |
US6081078(A) |
申请公布日期 |
2000.06.27 |
申请号 |
US19960649409 |
申请日期 |
1996.05.17 |
申请人 |
THOMSON CONSUMER ELECTRONICS, INC. |
发明人 |
TRUSKALO, WALTER;KNIGHT, PETER RONALD;SMITH, LAWRENCE EDWARD |
分类号 |
H04N3/23;G09G1/00;G09G1/04;H04N3/22;H04N3/233;(IPC1-7):G09G1/04;H01J29/70 |
主分类号 |
H04N3/23 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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