Abstract: A power voltage supply circuit for a display device including: a branch node; a voltage converter having an output terminal connected to the branch node, the voltage converter configured to convert an input voltage received from outside, and output a power voltage to the branch node; a first output node connected to the branch node and configured to output the power voltage; a second output node connected to the branch node; and a charge pump connected between the branch node and the second output node and configured to transform the power voltage with different gain values in response to a control signal.

Abstract: A power voltage supply circuit for a display device including: a branch node; a voltage converter having an output terminal connected to the branch node, the voltage converter configured to convert an input voltage received from outside, and output a power voltage to the branch node; a first output node connected to the branch node and configured to output the power voltage; a second output node connected to the branch node; and a charge pump connected between the branch node and the second output node and configured to transform the power voltage with different gain values in response to a control signal,

Abstract: According to some embodiments of the inventive concept, there is provided a liquid crystal display device including a backlight including a light source configured to emit first to N-th block lights respectively to first to N-th sub-frames, in a first direction, the first to N-th sub-frames being obtained by dividing a frame in time, and a display panel including pixels arranged in a matrix form and grouped into first to N-th row blocks along the first direction, the pixels being configured to display an image using the first to N-th block lights, and operations of the first to N-th row blocks being respectively synchronized with the first to N-th sub-frames, wherein a brightness of a K-th block light among the first to N-th block lights is determined on a basis of light source brightness data of a K-th row block among the first to N-th row blocks.

Abstract: According to some embodiments of the inventive concept, there is provided a liquid crystal display device including a backlight including a light source configured to emit first to N-th block lights respectively to first to N-th sub-frames, in a first direction, the first to N-th sub-frames being obtained by dividing a frame in time, and a display panel including pixels arranged in a matrix form and grouped into first to N-th row blocks along the first direction, the pixels being configured to display an image using the first to N-th block lights, and operations of the first to N-th row blocks being respectively synchronized with the first to N-th sub-frames, wherein a brightness of a K-th block light among the first to N-th block lights is determined on a basis of light source brightness data of a K-th row block among the first to N-th row blocks.

Abstract: A display device includes at least one light source array configured to provide a display panel with light, a dimming signal generating unit configured to receive an image data signal and generate a dimming signal, a first comparator configured to receive the dimming signal output from the dimming signal generating unit and a preset critical value and generate a comparison signal, a dimming modulating unit configured to receive the comparison signal output from the first comparator and the dimming signal output from the dimming signal generating unit and modulate the dimming signal, a constant current controller configured to receive the dimming signal output from the dimming modulating unit and a voltage from a sensor node, and to control a light driving current driving the light source array, and a resistor controller configured to change resistors connected to the sensor node by the comparison signal output from the first comparator.

Abstract: A light source device capable of preventing luminance from being decreased, a driving method of the light source device and a display device having the light source device are disclosed. Alight source device includes a plurality of light-emitting diode (“LED”) strings and an LED driving circuit. The LED strings include LEDs emitting lights connected in serial. The LED driving circuit supplies a driving voltage to the LED strings. The LED driving circuit maximizes the driving voltage supplied to the LED strings by using the minimum string current of string currents supplied to each LED string in an initial driving period. The LED driving circuit supplies the maximum driving voltage to the LED strings by blocking a current flowing through a sensing resistor disposed to sense the minimum string current in a normal driving period.

Abstract: A display device includes at least one light source array configured to provide a display panel with light, a dimming signal generating unit configured to receive an image data signal and generate a dimming signal, a first comparator configured to receive the dimming signal output from the dimming signal generating unit and a preset critical value and generate a comparison signal, a dimming modulating unit configured to receive the comparison signal output from the first comparator and the dimming signal output from the dimming signal generating unit and modulate the dimming signal, a constant current controller configured to receive the dimming signal output from the dimming modulating unit and a voltage from a sensor node, and to control a light driving current driving the light source array, and a resistor controller configured to change resistors connected to the sensor node by the comparison signal output from the first comparator.

Abstract: A light source device capable of preventing luminance from being decreased, a driving method of the light source device and a display device having the light source device are disclosed. Alight source device includes a plurality of light-emitting diode (“LED”) strings and an LED driving circuit. The LED strings include LEDs emitting lights connected in serial. The LED driving circuit supplies a driving voltage to the LED strings. The LED driving circuit maximizes the driving voltage supplied to the LED strings by using the minimum string current of string currents supplied to each LED string in an initial driving period. The LED driving circuit supplies the maximum driving voltage to the LED strings by blocking a current flowing through a sensing resistor disposed to sense the minimum string current in a normal driving period.

Abstract: A balance board includes; a substrate, a first wire disposed on the substrate, a second wire disposed on the substrate and spaced apart from the first wire, a plurality of first balance coils connected to the first wire and which uniformly distribute a first power supply voltage, a plurality of second balance coils connected to the second wire and which uniformly distribute a second power supply voltage, and a conductive pattern disposed on the substrate and spaced apart from the first and second wires, wherein the first and second wires are disposed substantially in parallel with each other, the second wire being divided into a plurality of parts with respect to an area where the first wire and the second wire cross over one another and the plurality of parts of the second wire are connected by a plurality of jumper connectors overlapping the first wire.

Abstract: A backlight assembly including: a plurality of lamp sockets each having a socket electrode; a plurality of lamps inserted into the plurality of lamp sockets, respectively, and each of the plurality of lamps comprising a lamp electrode connected with the socket electrode of the lamp socket in which the lamp is inserted; an inverter outputting a driving voltage for driving the plurality of lamps; and a balance board having a plurality of balance capacitors, wherein the plurality of balance capacitors are inserted into the plurality of lamp sockets, respectively, and each of the balance capacitors comprises a first balance electrode provided with the driving voltage and a second balance electrode connected with the socket electrode of the lamp socket in which the balance capacitor is inserted.

Abstract: A display apparatus includes a display panel and a backlight assembly including a lamp and an inverter. The inverter includes a main transformer, a main driver and a voltage controller. The main transformer applies a driving alternating current (AC) voltage to the lamp. The main driver generates an output signal controlling the main transformer based on a feedback signal from the main transformer. The voltage controller is electrically connected to a feedback terminal of the main driver to control a maximum level of a voltage applied to the feedback terminal.

Abstract: A balance board includes; a substrate, a first wire disposed on the substrate, a second wire disposed on the substrate and spaced apart from the first wire, a plurality of first balance coils connected to the first wire and which uniformly distribute a first power supply voltage, a plurality of second balance coils connected to the second wire and which uniformly distribute a second power supply voltage, and a conductive pattern disposed on the substrate and spaced apart from the first and second wires, wherein the first and second wires are disposed substantially in parallel with each other, the second wire being divided into a plurality of parts with respect to an area where the first wire and the second wire cross over one another and the plurality of parts of the second wire are connected by a plurality of jumper connectors overlapping the first wire.

Abstract: A backlight assembly including: a plurality of lamp sockets each having a socket electrode; a plurality of lamps inserted into the plurality of lamp sockets, respectively, and each of the plurality of lamps comprising a lamp electrode connected with the socket electrode of the lamp socket in which the lamp is inserted; an inverter outputting a driving voltage for driving the plurality of lamps; and a balance board having a plurality of balance capacitors, wherein the plurality of balance capacitors are inserted into the plurality of lamp sockets, respectively, and each of the balance capacitors comprises a first balance electrode provided with the driving voltage and a second balance electrode connected with the socket electrode of the lamp socket in which the balance capacitor is inserted.

Abstract: A display apparatus includes a display panel and a backlight assembly including a lamp and an inverter. The inverter includes a main transformer, a main driver and a voltage controller. The main transformer applies a driving alternating current (AC) voltage to the lamp. The main driver generates an output signal controlling the main transformer based on a feedback signal from the main transformer. The voltage controller is electrically connected to a feedback terminal of the main driver to control a maximum level of a voltage applied to the feedback terminal.