Apparatus for supplying power, backlight assembly and liquid crystal display apparatus having the same

A backlight assembly comprising:

• a lamp driving section for converting a direct current voltage source inputted from an external into an alternating current voltage source and transforming the convened alternating current voltage source;
• a light emitting section for emitting a light in response to the transformed alternating current voltage source, the light emitting section having a lamp unit tat receives a high voltage of an alternating current voltage source through at least one end terminal;
• and
• a light control section for increasing a brightness of the light,
• wherein the lamp driving section comprises:
• a control section for outputting a switching signal so as to control an output of a constant current supplied to the lamp unit in response to a dimming signal inputted from an external, the control section being operated in response to on and/or off signals from the external;
• a switching section for controlling an output of a direct current voltage source in response to the switching signal;
• a power outputting section for converting the direct current voltage source from the switching section into the alternating current voltage source, transforming the converted alternating current voltage source into an alternating current voltage source having a constant voltage to provide the alternating current voltage source having the constant voltage to the lamp unit;
• a sensing section for sensing variation of the alternating current voltage source supplied to the lamp unit, the sensing section wirelessly connected to the power outputting section;
• and
• a detecting section for comparing a sensing signal provided from the sensing section with a predetermined reference signal to output a detecting signal to the control section, thereby maintaining the constant current to be supplied to the lamp unit.

An LCD apparatus comprising:

• a backlight assembly having a lamp driving section for converting a direct current voltage source inputted from an external into an alternating current voltage source and transforming the converted alternating current voltage source;
• a light emitting section for emitting a light in response to the transformed alternating current voltage source, the light emitting section having a lamp unit that a plurality of external electrode fluorescent lamps are connected to each other in parallel, each of the external electrode fluorescent lamps having at least one electrode that receives a high voltage of an alternating current voltage source;
• and a light control section for increasing a brightness of the light provided from the light emitting section;
• and
• a display unit disposed on the light control section, for receiving the light from the light emitting section through the light control section and displaying an image,
• wherein the lamp driving section comprises:
• a control section for outputting a switching signal so as to control an output of a constant current supplied to the lamp unit in response to a dimming signal inputted form an external, the control section being operated in response to on and/or off signals from the external;
• a switching section for controlling an output of a direct current voltage source in response to the switching signal;
• a power outputting section for converting the direct current voltage source from the switching section into the alternating current voltage source, transforming the converted alternating current voltage source into an alternating current voltage source having a constant voltage to provide the alternating current voltage source having a constant voltage to the lamp unit;
• a sensing section for sensing variation of the alternating current voltage source supplied to the lamp unit, the sensing section wirelessly connected to the power outputting section;
• and
• a detecting section for comparing a sensing signal provided from the sensing section with a predetermined reference signal to output a detecting signal to the control section, thereby maintaining the constant current to be supplied to the lamp unit.