Power supply device and display device including the same

A display device, comprising:

• a display panel to display an image;
• a driver to drive the display panel;
• and
• a power supply to supply a driving voltage to the driver,
• wherein the power supply includes:
• n power supply circuits connected in parallel, where n is a natural number of 2 or more, and
• a controller configured to control a number of operating power supply circuits among the n power supply circuits,
• wherein the controller includes:
• n detectors respectively connected to the n power supply circuits, the n detectors are configured to receive a feedback current from the number of operating power supply circuits among the n power supply circuits;
• a comparator configured to compare the feedback current with predetermined first and second reference currents to output first, second, and third state signals;
• and
• an on/off controller configured to determine the number of the operating power supply circuits according to the cumulative number of each of the first to third state signals during a predetermined window section and to control an on/off of the power supply circuits according to the determined number, wherein:
• the window section includes a plurality of unit sections,
• each of the n detectors is configured to calculate an average current of each of the plurality of unit sections based on the feedback current,
• the comparator is configured to output the first state signal when the average current of each of the plurality of unit sections is greater than the first and second reference currents,
• the comparator is configured to output the second state signal when the average current of each of the plurality of unit sections is between the first and second reference currents, and
• the comparator is configured to output the third state signal when the average current of each of the plurality of unit sections is less than the first and second reference currents.