Frequency signal generating system and display device

A frequency signal generating system comprising:

• a digital phase-locked loop for receiving a source frequency signal;
• a loop filter, an input terminal of which is connected to an output terminal of the digital phase-locked loop, for filtering out high frequency components of a signal output from the digital phase-locked loop;
• a voltage controlled oscillator, an input terminal of which is connected to an output terminal of the loop filter, for outputting a target frequency signal according to a signal from the loop filter,
• wherein, an output terminal of the voltage controlled oscillator is connected to a first input terminal of the digital phase-locked loop so that the target frequency signal output from the voltage controlled oscillator is fed back to the digital phase-locked loop, the digital phase-locked loop performs frequency-dividing and phase-detecting on the source frequency signal and the fed back target frequency signal so that the target frequency signal output from the voltage controlled oscillator and the source frequency signal satisfy a definite mathematical relationship therebetween, and
• a frequency divider connected between the output terminal of the voltage controlled oscillator and the first input terminal of the digital phase-locked loop, for performing frequency-dividing on the fed back target frequency signal and supplying the frequency-divided target frequency signal to the digital phase-locked loop,
• wherein the frequency divider is a digital frequency divider, the digital frequency divider is configured by a monolithic integrated frequency synthesizer chip, and the loop filter is an analog low-pass filter.