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Home Image Analysis CRT-drive-control-circuit

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 CRT drive control circuit

Details
Inventors: Tamura, Takahiko; Tokuhara, Masaharu;
Assignee: Sony Corporation (Tokyo, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

A CRT drive control circuit for automatically limiting beam current when it is too large. A brightness reduction control and a contrast reduction control are alternately applied in accordance with a dark level detection of a video signal.

DETAILED DESCRIPTION It is an object of the present invention to provide a CRT drive control circuit which eliminates deterioration of dark resolution and changes in a ratio of luminance to chroma, and which maintains a high contrast.
In order to achieve the above object of the present invention, there is provided a CRT drive control circuit for detecting a beam current of a CRT and decreasing a luminance or contrast level when a detected current is large.
A detector is provided for detecting a black level of a video signal, and a switching control circuit is provided for changing a ratio of a reduction control in brightness to a reduction control in contrast in response to a detected black level.
With this circuit arrangement, beam current limitation can be performed without a deterioration of dark resolution and a decrease in contrast.



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