The invention discloses an LCD having a static noise eliminating device which can eliminate the static noise of at least one loudspeaker on the LCD. A frequency converter adjusts brightness of a luminous tube on an LCD panel by a work cycle control method. In the work cycle control method, an output voltage of power supply equipment is caused to generate continuous waves such that a voltage supplied to a sound source amplifier is unstable. When volume of the loudspeaker is turned to very low or no music is output, the loudspeaker can generate the noise due to unstable voltage of the sound source amplifier. The static noise eliminating device is arranged between the power supply equipment and the sound source amplifier, which can provide a stable output voltage to the sound source amplifierto eliminate the static noise of the loudspeaker on the LCD.