Focus voltage tracking circuit
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United States of America Patent
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Sep 5, 2000
Grant Date -
N/A
app pub date -
Jun 19, 1998
filing date -
Jun 19, 1998
priority date (Note) -
Expired
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Abstract
A direct current focus voltage applied to a focus electrode of a cathode ray tube that produces a blue image is set to slightly defocus the blue image for increasing the blue beam spot size. The increase in the blue beam spot reduces the saturation and allows brighter blue and increased blue video drive range. A passive network is coupled between an ultor electrode and the focus electrode to provide tracking of focus voltage-to-ultor voltage ratio. The tracking prevents voltage fluctuation of the ultor voltage produced by video loading from disturbing uniform defocussing in the entire blue image.
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