Display apparatus and diriving method using the same

PURPOSE: A display device and a driving method thereof are provided to improve efficiency of the entire power circuit through a direct current to direct current (DC-DC) modularization concept. CONSTITUTION: A power supply part (152-1) supplies a converted DC voltage. A switch part (152-2) is connected with the power supply part in series and performs a switching operation according to different switching signals. A transformer part (152-3) converts a voltage applied to a primary winding into a secondary winding voltage according to the switching operation of the switch part. A synchronous rectification part (152-4) performs synchronous rectification for the voltage induced at the secondary winding. An output part (152-5) outputs the rectified DC voltage. [Reference numerals] (152-1) Power supply part; (152-2) Switch part; (152-3) Transformer part; (152-4) Synchronous rectification part; (152-5) Output part