Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
January 29, 2008
Patent Application Number
11216605
Date Filed
August 31, 2005
Patent Primary Examiner
Patent abstract
Adverse effects of switching noise produced by a charge pump circuit on a displayed image are prevented. In a synchronizing separation circuit 18, a synchronizing signal is separated from a video signal. The separated synchronizing signal is subjected to ½ frequency division in a flip-flop 20 to obtain a clock signal having a period which is two times as much as one horizontal period, and this clock signal is utilized to control switching of the charge pump circuit. As a result, a timing at which each switch in the charge pump is changed over can be set in a period close to a horizontal synchronizing signal without a video signal, thereby preventing noise from affecting the video signal.
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