Abstract: A light unit includes a DC/DC converter. A plurality of unit light emitting diode columns receive a voltage applied from the DC/DC converter. A plurality of transistors, respectively, are connected to the plurality of unit light emitting diode columns. A current deviation compensating unit compensates for deviations between currents respectively flowing through the plurality of unit light emitting diode columns by a pulse current width modulation average current control method. A connection switch sequentially connects the current deviation compensating unit with the plurality of transistors. A resistor is connected to output terminals of the plurality of transistors. A switch controller controls connection between the connection switch and the current deviation compensating unit based on a signal applied to the resistor.

Abstract: A backlight unit may include a wall and a plurality of light sources. The wall may have a side in a cross-sectional view of the backlight unit. The side may have a curved shape in the cross-sectional view of the backlight unit. The plurality light sources may include a first light source and a second light source. The second light source may be positioned farther away from a center portion of the wall than the first light source in the cross-sectional view of the backlight unit. A minimum distance between the second light source and the side may be greater than a minimum distance between the first light source and the side in the cross-sectional view of the backlight unit.

Abstract: A backlight unit may include a wall and a plurality of light sources. The wall may have a side in a cross-sectional view of the backlight unit. The side may have a curved shape in the cross-sectional view of the backlight unit. The plurality light sources may include a first light source and a second light source. The second light source may be positioned farther away from a center portion of the wall than the first light source in the cross-sectional view of the backlight unit. A minimum distance between the second light source and the side may be greater than a minimum distance between the first light source and the side in the cross-sectional view of the backlight unit.

Abstract: A backlight unit includes a DC-DC converter; a voltage control unit which controls output voltage of the DC-DC converter; a plurality of unit light emitting diode arrays; and current deviation compensating unit in connection with input terminals of the plurality of unit light emitting diode arrays. The current deviation compensating unit receives the controlled voltage of the voltage control unit and transfers a feedback signal to the voltage control unit based on the received voltage, and actively compensates a current deviation generated by electrical characteristics of the plurality of unit light emitting diode arrays and transfers the compensated current deviation to the input terminals of the plurality of unit light emitting diode arrays.

Abstract: A light unit includes a DC/DC converter. A plurality of unit light emitting diode columns receive a voltage applied from the DC/DC converter. A plurality of transistors, respectively, are connected to the plurality of unit light emitting diode columns. A current deviation compensating unit compensates for deviations between currents respectively flowing through the plurality of unit light emitting diode columns by a pulse current width modulation average current control method. A connection switch sequentially connects the current deviation compensating unit with the plurality of transistors. A resistor is connected to output terminals of the plurality of transistors. A switch controller controls connection between the connection switch and the current deviation compensating unit based on a signal applied to the resistor.

Abstract: A DC-DC converter includes a plurality of boost circuits and a controller. The boost circuits are coupled to another in parallel. The boost circuits receive a DC voltage and boost the DC voltage. The controller drives the boost circuits with a duty ratio of less than 50% and different phases.

Abstract: A backlight unit includes: a light source unit including at least one light emitting diode (“LED”) string; a driving current controller which is connected to a cathode terminal of the at least one LED string and controls a driving current which flows through the at least one LED string; a feedback unit which generates a feedback signal based on a dimming input signal and a voltage of the cathode terminal of the at least one LED string; and a direct current to direct current (“DC-DC”) converter which generates a driving voltage in response to the feedback signal and provides the driving voltage to the light source unit.

Abstract: A backlight unit includes a DC-DC converter; a voltage control unit which controls output voltage of the DC-DC converter; a plurality of unit light emitting diode arrays; and current deviation compensating unit in connection with input terminals of the plurality of unit light emitting diode arrays. The current deviation compensating unit receives the controlled voltage of the voltage control unit and transfers a feedback signal to the voltage control unit based on the received voltage, and actively compensates a current deviation generated by electrical characteristics of the plurality of unit light emitting diode arrays and transfers the compensated current deviation to the input terminals of the plurality of unit light emitting diode arrays.

Abstract: A DC-DC converter includes a plurality of boost circuits and a controller. The boost circuits are coupled to another in parallel. The boost circuits receive a DC voltage and boost the DC voltage. The controller drives the boost circuits with a duty ratio of less than 50% and different phases.

Abstract: A lamp driving apparatus wherein a plurality of two-winding balance circuits are connected to a plurality of parallel-connected lamp groups so that all of the lamps may be illuminated even though ambient conditions cause some of the lamps to have low resistance. Capacitors are connected to first electrodes and certain of the balance coil windings are connected to second electrodes of one of the lamp groups while, in a second lamp group, others of the balance coil windings are connected to the first electrodes and capacitors are connected to the second electrodes thereof, current flowing through balance coil windings to some lamps being affected by current flowing through balance coil windings to other lamps.

Abstract: A lamp driving apparatus wherein a plurality of two-winding balance circuits are connected to a plurality of parallel-connected lamp groups so that all of the lamps may be illuminated even though ambient conditions cause some of the lamps to have low resistance. Capacitors are connected to first electrodes and certain of the balance coil windings are connected to second electrodes of one of the lamp groups while, in a second lamp group, others of the balance coil windings are connected to the first electrodes and capacitors are connected to the second electrodes thereof, current flowing through balance coil windings to some lamps being affected by current flowing through balance coil windings to other lamps.