Abstract: A transformer for an LLC resonant converter having a reduced size and reduced material costs is disclosed. The transformer includes a pair of cores and a bobbin provided with a through hole formed therethrough. Each core includes a first leg and a second leg such that the first legs of the cores are opposite from and are connected to each other within the through hole. The second legs of the cores are opposite each other and are connected to each other at the outside of the bobbin. The bobbin includes a first winding unit on which a primary coil is wound and a second winding unit on which a secondary coil is wound.

Abstract: A display device including a front cover and a rear cover coupled to each other in order to receive a display panel, drive board and power supply board, is provided. A shield case mounted on the power supply board and coupled to the rear cover removes noise conducted to the rear cover. The shield case serves to disperse and absorb noise conducted to the rear cover, enabling removal of the noise. A frame ground terminal of a socket is connected to the shield case in order to allow the shield case to be used as a ground, resulting in an increased ground area. Further, the shield case may reduce radiation noise and conduction noise generated during driving of a plurality of drive units provided in the display device.

Abstract: Provided are a method and apparatus for improving the power factor of an input power. The apparatus includes an input unit receiving the input power, a power factor correction unit correcting the power factor of the input power applied to the input unit, and a saturation prevention unit controlling the power factor correction unit such that the corrected power does not exceed a set power limit.

Abstract: A display device and a driving method are provided. The display device includes: a display panel which displays an image; at least one light emitting diode (LED) which emits light to the display panel; a driver which supplies an operating voltage to the LED and drives the LED; a feedback unit which detects a level of a voltage drop of the LED and outputs a detection signal corresponding to the detected level of the voltage drop; and a first controller which controls a level of the operating voltage supplied to the LED based on the operating voltage supplied to the LED and the detection signal output by the feedback unit.

Abstract: A display apparatus and a power supplying method are provided. The display apparatus includes a signal receiver which receives a video signal; a signal processor which processes the video signal; a display unit which displays an image based on a video signal processed by the signal processor; and a power supply which converts an alternating current (AC) voltage into a direct current (DC) voltage and supplies an operation voltage to the display unit, the power supply including: a power factor correction (PFC) unit which adjusts the DC voltage and corrects a power factor of the power supply; a detector which detects a plurality of voltages in the power supply and outputs a common detection signal indicating whether at least one of the plurality of voltages is abnormal; and a controller which receives the common detection signal, and controls the PFC unit based on the common detection signal.

Abstract: Provided are a method and apparatus for improving the power factor of an input power. The apparatus includes an input unit receiving the input power, a power factor correction unit correcting the power factor of the input power applied to the input unit, and a saturation prevention unit controlling the power factor correction unit such that the corrected power does not exceed a set power limit.