Abstract: An apparatus and a method for driving a light source are provided. The apparatus includes a power converting unit which converts a direct current (DC) power into an alternating current (AC) power for driving the light source, and a control unit which controls the power converting unit to convert the DC power into the AC power according to a pulsewave.

Abstract: A pulse width modulation (PWM) dimming control method and a display apparatus having a PWM dimming control function are provided. The method includes setting a PWM period of a group lighting block based on a state of both a first gate line and a last gate line among a plurality of gate lines corresponding to the group lighting block; and controlling PWM dimming of the group lighting block based on the set PWM period. The display apparatus includes a timing controller which determines a pulse width modulation (PWM) period of a group lighting block based on a state of both a first gate line and a last gate line among a plurality of gate lines corresponding to the group lighting block; and a PWM dimming controller which generates a PWM signal for controlling PWM dimming based on the determined PWM period.

Abstract: The present invention relates to an LED driver for driving light emitting diodes. The LED driver comprises a linear mode driver to increase and decrease a linear mode current to make a current flow in the LED at a predetermined target current value and output it to the LED; and a switch mode driver to increase and decrease a switch mode current depending on whether the linear mode current exceeds a predetermined reference current value and output it to the LED. Thus, the present invention provides an LED driver having high power efficiency and light efficiency and minimal distortions of a driving current.

Abstract: A light emitting diode (LED) driver drives a plurality of LEDs, and includes a plurality of LED drivers with inherent addresses thereof respectively driving the plurality of LEDs; a serial bus connected to the plurality of LED drivers; and a sequence controller serially transmitting a control signal for driving the plurality of LEDs and the inherent addresses, allowing the plurality of LED drivers to be sequentially driven, in the form of digital data through the serial bus. Thus, the LED driver accomplishes appropriate response speed corresponding to a human eye's recognition limit. Further, the LED driver provides easy fabrication, small size and lower production cost. The LED driver generates less noise while large current and high voltage fluctuate. Also, the LED driver automatically detects malfunction and automates initial current setting for production.

Abstract: A light emitting diode (LED) driver to drive an LED, including a current adjusting unit to adjust magnitude of a current flowing on the LED by supplying power from a power supply device to the LED and cutting off the power. A modulation control unit is provided to modulate a waveform of the current flowing on the LED by controlling the adjustment operation of the current adjusting unit. A constant current offset unit to control the adjustment operation of the current adjusting unit is provided so that the current flowing on the LED is higher or equal to a predetermined value as the waveform thereof is modulated. Thus, provided is an LED driver having improved power consumption efficiency.

Abstract: A power supply unit is provided. The power supply unit comprises a capacitor, a power input unit supplying power to the capacitor, a temperature sensor which is incorporated into the capacitor and senses a temperature of the capacitor, and a power control unit controlling a power path supplying power from the power input unit to the capacitor based on the sensed result of the temperature sensor. The power supply unit can be used continuously by shutting off a supply of power to protect an internal circuit of a capacitor in case of the abrupt increase in internal temperature of the capacitor.

Abstract: An electronic apparatus and method of controlling the electronic apparatus are provided, in which a power supply supplies a driving voltage to a system; and a controller sequentially outputs a control signal controlling a level of the driving voltage to the power supply until a level of a usage voltage corresponding to the driving voltage in the system becomes substantially identical to a predetermined reference level, if the level of the usage voltage is not substantially identical to the reference level. Accordingly, the electronic apparatus and control method thereof automatically adjusts a size of driving power supplied to respective parts of the electronic apparatus.

Abstract: A light emitting diode (LED) driver drives a plurality of LEDs, and includes a plurality of LED drivers with inherent addresses thereof respectively driving the plurality of LEDs; a serial bus connected to the plurality of LED drivers; and a sequence controller serially transmitting a control signal for driving the plurality of LEDs and the inherent addresses, allowing the plurality of LED drivers to be sequentially driven, in the form of digital data through the serial bus. Thus, the LED driver accomplishes appropriate response speed corresponding to a human eye's recognition limit. Further, the LED driver provides easy fabrication, small size and lower production cost. The LED driver generates less noise while large current and high voltage fluctuate. Also, the LED driver automatically detects malfunction and automates initial current setting for production.

Abstract: The present invention relates to an LED driver for driving light emitting diodes. The LED driver comprises a linear mode driver to increase and decrease a linear mode current to make a current flow in the LED at a predetermined target current value and output it to the LED; and a switch mode driver to increase and decrease a switch mode current depending on whether the linear mode current exceeds a predetermined reference current value and output it to the LED. Thus, the present invention provides an LED driver having high power efficiency and light efficiency and minimal distortions of a driving current.

Abstract: A light emitting diode (LED) driver to drive an LED, including a current adjusting unit to adjust magnitude of a current flowing on the LED by supplying power from a power supply device to the LED and cutting off the power. A modulation control unit is provided to modulate a waveform of the current flowing on the LED by controlling the adjustment operation of the current adjusting unit. A constant current offset unit to control the adjustment operation of the current adjusting unit is provided so that the current flowing on the LED is higher or equal to a predetermined value as the waveform thereof is modulated. Thus, provided is an LED driver having improved power consumption efficiency.

Abstract: A high-efficiency power supply apparatus used with a driving system of a display panel and a method of designing the same to improve an electrical power efficiency by providing a non-isolated direct current (DC) power directly to a display panel driving circuit comprise: a DC power supplying circuit to improve a power factor by rectifying an alternating current (AC) power and generating the non-isolated DC power, which is not isolated from the AC power, and an isolated DC power; a display panel driving circuit to generate various driving signals for driving the display panel with the non-isolated DC power; and a video signal processing circuit to perform a predetermined video signal processing for generating data to drive the display panel with the isolated DC power.

Abstract: A single-sided driver used with a display panel and a method of designing the same. The single-sided driver used with a display panel includes a single-sided driver circuit having predetermined circuit elements including energy accumulation elements and switching elements, and establishes current flow paths to generate predetermined driving voltage waveforms required for both X and Y axes electrodes, according to predetermined switching sequences to drive the display panel.

Abstract: A high-efficiency power supply apparatus used with a driving system of a display panel and a method of designing the same to improve an electrical power efficiency by providing a non-isolated direct current (DC) power directly to a display panel driving circuit comprise: a DC power supplying circuit to improve a power factor by rectifying an alternating current (AC) power and generating the non-isolated DC power, which is not isolated from the AC power, and an isolated DC power; a display panel driving circuit to generate various driving signals for driving the display panel with the non-isolated DC power; and a video signal processing circuit to perform a predetermined video signal processing for generating data to drive the display panel with the isolated DC power.

Abstract: A world wide power supply apparatus which includes a full-wave rectifier circuit having a pair of AC input terminals and a pair of DC output terminals, a pair of capacitors connected in serial between a pair of DC output terminals, a relay switch connected between a common connection point of capacitors and one of said pair of AC input terminals and a relay driving circuit driving said relay switch so that the relay switch can operate in a voltage doubling mode by turning on said relay switch in case that an AC voltage supplied to a pair of AC input terminals is a low voltage, and can operate in a full-wave rectification mode by turning off said relay in case of a high voltage. The power supply apparatus switches a voltage doubling circuit by using a relay with no heat generation instead of a triac.