Electromagnetic interference prevention apparatus for flat panel display

An electromagnetic interference prevention apparatus for a flat panel display comprising:

• clock generation means for generating a reference clock signal;
• spread spectrum clocking means for receiving the reference clock signal generated by the clock generation means and modulating a frequency of the received reference clock signal according to a modulation profile of a predetermined frequency such that an intensity of EMI is reduced, the modulation producing a modulated clock signal having a bandwidth between a nominal frequency (fnom) of the clock signal and a down spreading frequency (1−δ) fnom, where δ represents a spreading magnitude as a percentage of the nominal frequency (fnom);
• and
• data processing means for receiving an output clock signal from said spread spectrum clocking means and performing a predetermined data process in response to the received clock signal, wherein the data processing means being a format converter being adapted to receive the modulated clock signal from the spread spectrum clocking means as a reference clock signal for a phase lock loop therein and output a modified clock signal synchronized with input data.

An electromagnetic interference prevention apparatus for a flat panel display comprising:

• clock generation means for generating a clock signal;
• spread spectrum clocking means for modulating the clock signal generated by the clock generation means such that the reference clock signal is frequency modulated between a_nominal frequency (fnom) of the reference clock signal and a down spreading frequency (1−δ) fnom, where δ represents a spreading magnitude as a percentage of the nominal frequency (fnom), a frequency of the clock signal being modulated according to a modulation profile of a predetermined frequency to reduce an intensity of EMI;
• and
• data processing means for receiving the clock signal modulated by said spread spectrum clocking means and performing a predetermined data process in response to the received clock signal.

An electromagnetic interference prevention apparatus for a flat panel display comprising:

• a clock generator configured to generate a reference clock signal;
• a spread spectrum clocking circuit configured to modulate the reference clock signal between a nominal frequency (fnom) of the reference clock signal and a down spreading frequency (1−δ) fnom, where δ represents a spreading magnitude as a percentage of the nominal frequency (fnom), so a highest amplitude of the modulated clock signal is below a predetermined Electromagnetic Interference (EMI) limit causing EMI to the panel display, a frequency of the clock signal being modulated according to a modulation profile having a predetermined frequency to reduce an intensity of EMI;
• and
• a data processor configured to synchronize the clock signal modulated by the spread spectrum clocking circuit with an input clock signal at a predetermined frequency and to output the synchronized signal, the data processor bring a format converter being adapted to receive the modulated clock signal from the spread spectrum clocking circuit as a reference clock signal for a phase lock loop therein and output a modified clock signal synchronized with input data.

An electromagnetic interference prevention apparatus for a flat panel display comprising:

• clock generation means for generating a clock signal;
• spread spectrum clocking means for modulating the clock signal generated by the clock generation means;
• and
• data processing means including a phase lock loop to synchronize the clock signal modulated by the spread spectrum clocking means with an input clock signal at a predetermined frequency, wherein an data of the data processing means is outputted with a signal of the predetermined frequency.

An electromagnetic interference prevention apparatus for a flat panel display comprising:

• clock generation means for generating a clock signal;
• spread spectrum clocking means for modulating the clock signal generated by the clock generation means such that the clock signal is frequency modulated between a nominal frequency (fnom) of the clock signal and a down spreading frequency (1−δ) fnom, where δ represents a spreading magnitude as a percentage of the nominal frequency (fnom), a frequency of the clock signal generated by the clock generation means being modulated according to a modulation profile to reduce an intensity of EMI, wherein an energy distribution shape of the EMI is determined according to the modulation profile at a predetermined frequency;
• and
• data processing means for synchronizing the clock signal modulated by the spread spectrum clocking means with an input clock signal at the predetermined frequency and outputting input data as a signal of the predetermined frequency.

An electromagnetic interference prevention apparatus for a flat panel display comprising:

• clock generation means for generating a reference clock signal;
• converting means for modulating the clock signal and outputting a modulated signal according to a predetermined modulation profile;
• operating means for outputting a clock signal using the modulated signal;
• and
• displaying means for outputting a data received from the operating means according to the clock signal.

An electromagnetic interference prevention apparatus for a flat panel display comprising:

• clock generation means for generating a reference clock signal;
• spread spectrum clocking means for receiving the reference clock signal generated by said clock generation means and modulating a frequency of the received reference clock signal according to a modulation profile of a predetermined frequency;
• and
• phase synchronizing means for receiving an output clock signal from said spread spectrum clocking means as a reference clock outputting a modified clock signal synchronized with input data.