Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Patent
1997-05-16
1998-02-24
Liang, Regina
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
348536, 331 1R, G09G 500
Patent
active
057215707
ABSTRACT:
A horizontal synchronizing signal is applied as a reference signal and a voltage-controlled oscillator outputs a frequency signal on the basis of the frequency of the horizontal synchronizing signal. The period of the frequency signal is divided in accordance with a frequency-dividing value set in advance, the difference in frequency between the frequency-divided frequency signal and the horizontal synchronizing signal and the phase difference between them are obtained, and control is performed in such a manner that the frequency of the signal outputted by the voltage-controlled oscillator is decided in dependence upon the frequency difference. In an interval in which a vertical synchronizing signal turns off and the frequency of the horizontal synchronizing signal fluctuates, the input to the voltage-controlled oscillator is held fixed to prevent a fluctuation in the outputted display clock.
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Takagi Yuichi
Tsunoda Takashi
Canon Kabushiki Kaisha
Liang Regina
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