Abstract: A display device with improved display quality is provided. The display device includes an LED light source emitting light, a display panel receiving the light to display an image, and a backlight driver adjusting the magnitude and the duty ratio of an LED current I_LED flowing through the LED light source. The waveform of the LED current I_LED includes at least one of a rising section in which the magnitude of the LED current more gradually increases from a turn-off current value to a peak value, and a falling section in which the magnitude of the LED current more gradually decreases from the peak value to the turn-off current value. This acts to reduce waterfall noise.

Abstract: To drive light-emitting blocks, currents are sensed through the light-emitting blocks arranged in an M×N matrix (wherein M and N are natural numbers), wherein M rows are connected to a row switching part and N columns are connected to a column switching part. The light-emitting blocks are driven by a local dimming method with feedback control responsive to the sensed currents.

Abstract: A backlight assembly includes at least one light-generating board, a light source driving board and a coupling board. The light-generating board generates light. The light source driving board provides control signals to the light-generating board. The coupling board is coupled via slot connectors to the light-generating board and the light source driving board to electrically connect the light-generating board and the light source driving board to each other. Thus, manufacturing efficiency may be improved in comparison with electrically connecting the light-generating board and the light source driving board through wires.

Abstract: A backlight unit assembly, a liquid crystal display having the same, and a dimming method thereof are provided. The dimming method for a liquid crystal display includes setting a plurality of lookup tables, each lookup table having different data for adjusting luminance corresponding to a same grayscale, calculating a grayscale average of a whole liquid crystal display panel and grayscale averages of individual liquid crystal display panel blocks with respect to an image signal input to the liquid crystal display panel, selecting one of the plurality of lookup tables in accordance with the whole grayscale average, and calculating the data for obtaining the luminance corresponding to the individual grayscale averages in the selected lookup table, and adjusting and applying power to a light emitting diode assembly using the calculated data.

Abstract: A point light source includes a light-emitting element, an optical lens, and at least two reflective members. The light-emitting element emits a point light. The optical lens is disposed over the light-emitting element. The reflective members are disposed in the optical lens. The reflective members confine an optical path of the light emitted from the light-emitting element, thereby substantially preventing the illumination areas of the point light sources from overlapping each other.

Abstract: A method of driving light sources controls amounts of light from light-emitting diode (LED) strings based on pulse signals to operate the LED strings connected in parallel. Voltages are synchronized with the pulse signals at input terminals of control circuits to detect the voltages, the control circuits being connected to the LED strings and controlling resistance variations of the LED strings. The operation of the LED strings is stopped when the detected voltage is out of a predetermined allowable voltage range due to a short-circuited LED. Therefore, a light source device may be protected by stopping the operation of the LED strings.

Abstract: A backlight unit and a liquid crystal display including the same are provided. The backlight unit includes a circuit board, at least one internal interconnection formed on the circuit board, and a plurality of light emitting devices mounted to be connected with the at least one internal interconnection on the circuit board, each of the plurality of light emitting devices including at least one light emitting chip and at least one driving chip.

Abstract: In order to perform local dimming, a driving dimming duty cycle is generated using a target gamma curve (TGV), wherein the driving dimming duty cycle corresponds to a representative grayscale value (RGV) of each of a plurality of dimming unit areas. Each of a plurality of light unit blocks of a light source is driven based on the driving dimming duty cycle, wherein the light unit blocks correspond to the dimming unit areas, respectively. Therefore, a display apparatus may display an image having a higher contrast ratio than normal.

Abstract: A backlight unit and a display device having a backlight unit are disclosed. The backlight unit includes an LED substrate. The LED substrate includes a plurality of emission regions. An LED is provided in each emission region. An LED driver drives the LED. An LED controller supplies a dimming control signal to the LED driver. The LED controller is provided on a driving board. A first connection unit is provided in the LED substrate. A second connection unit is provided in the driving board. The second connection unit is capable of coupling with the first connection unit.

Abstract: The present invention relates to a backlight unit with a light emitting diode block assembly connected thereto, and a liquid crystal display having the backlight unit. In one embodiment, the backlight unit includes a plurality of light source blocks each of which includes a substrate having a light source and an electrode portion formed thereon; a connector electrically connecting the light source blocks to each other, coupled to the light source blocks in contact with one side of the connector, and fastening the light source blocks to each other by cross-coupling the light source blocks; and a supporter disposed on the other side of the connector. In this manner, LED blocks can be simultaneously both electrically and mechanically coupled, using a relatively small and simple number of connectors, facilitating reliability and ease of manufacture.

Abstract: There is provided a backlight assembly that supplies light to an LCD panel. The backlight assembly includes an LED assembly and a backlight unit. The LED assembly includes at least one LED block region having a plurality of LEDs. The backlight unit driving unit includes a color control unit that determines a representative color of the LED block region using an image signal supplied to the LCD panel, and a dimming control unit that controls the color of the LED block region based on the representative color determined by the color control unit.

Abstract: A light source module comprises a light source including a plurality of light emitting units and a voltage current source for supplying driving power to the light source according to a plurality of luminance control signals. The luminance control signals are dimming signals. The light source module also comprises a multi-channel current controller for adjusting luminance of the plurality of light emitting units respectively according to the plurality of luminance control signals.

Abstract: A two-dimensional light source includes a base substrate having holes, wires disposed on a lower surface of the base substrate, a light emitting diode (LED) chip disposed on an upper surface of the base substrate, plugs that connect two electrodes of the LED chip to the wires through the holes, a buffer layer covering the LED chip, and an optical layer that is disposed on the buffer layer and has an optical pattern formed at a portion of the optical layer corresponding to the LED chip.

Abstract: In a backlight assembly, a reflector member includes a base sheet reflecting a light and a connecting line disposed on a face of the base sheet and, and transmitting signals. An input pad is disposed at a first end portion of the connecting line and receives the signals, and an output pad is disposed at a second end portion of the connecting line and outputs the signals transmitted through the connecting line.

Abstract: A two-dimensional light source includes a base substrate having holes, wires disposed on a lower surface of the base substrate, a light emitting diode (LED) chip disposed on an upper surface of the base substrate, plugs that connect two electrodes of the LED chip to the wires through the holes, a buffer layer covering the LED chip, and an optical layer that is disposed on the buffer layer and has an optical pattern formed at a portion of the optical layer corresponding to the LED chip.

Abstract: A backlight assembly includes a plurality of light source units and a partition member. Each of the light source units includes a plurality of light sources generating different wavelengths of light from each other and a circuit board on which the light sources are mounted. The partition member is disposed between the light source units to partially transmit and partially reflect the light generated from the light source units.

Abstract: A point light source includes a light-emitting element, an optical lens, and at least two reflective members. The light-emitting element emits a point light. The optical lens is disposed over the light-emitting element. The reflective members are disposed in the optical lens. The reflective members confine an optical path of the light emitted from the light-emitting element, thereby substantially preventing the illumination areas of the point light sources from overlapping each other.

Abstract: A backlight unit includes light sources and optical mixers individually formed between the light sources to reflect light. The light emitted from the light sources becomes uniform while passing the optical mixers. Even when the thickness of the backlight unit is thinner, the brightness distribution of the light becomes uniform.

Abstract: A light-emitting module that allows a display panel to be made thinner is presented. The light-emitting module includes a point-light source and an optical cap. The point-light source is disposed on a substrate. The optical cap surrounds a side portion and an upper portion of the point-light source and has a first embossing pattern formed thereon. Light is emitted from the point-light source and passes through the optical cap to be diffused, for example by the first embossing pattern. Thus, extra components such as a diffusing plate, a diffusing sheet, etc., may be omitted from the display device, and the display device may be slimmer.

Abstract: A backlight assembly includes a light source unit a light guiding plate and an optical changing pattern. The tight source unit includes a light source, a first lens portion enclosing the light source and a second lens portion positioned on the first lens portion. The second lens portion has a concave shape at an upper face. The light guiding plate includes an upper face and a lower face. The light guiding plate has a groove formed on the lower face to enclose at least a portion of the light source unit. The light guiding plate guides the light generated from the light source unit. The optical path changing pattern is formed on the upper face of the light guiding plate, and faces the light source unit. As a result, an optical distribution of the backlight assembly may be uniformized, and a size of the backlight assembly may be reduced.