Display control apparatus

Details Display control apparatus Display control apparatus

1994-04-28

1998-01-06

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

345202, G09G 106

Patent

active

057060355

ABSTRACT:
In a video display control, a phase locked loop (PLL) circuit generates a multiplied frequency signal from a reference signal. The stability of the PLL circuit is maintained even when the reference signal has different frequencies by providing a number of multiplication values corresponding to the number of different reference signal frequencies and switching the multiplication value when a change in frequency is detected to stabilize the PLL circuit.

REFERENCES:
patent: 4626837 (1986-12-01), Priestly
patent: 5068731 (1991-11-01), Takeuchi
patent: 5406308 (1995-04-01), Shiki
patent: 5479073 (1995-12-01), Mamiya et al.

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