Abstract: A pixel includes: a storage capacitor connected between a first power supply voltage and a gate node; a first transistor including a gate electrode connected to the gate node; a second transistor to transfer a data signal to a source of the first transistor in response to a scan signal; a third transistor to diode-connect the first transistor in response to the scan signal, and including first and second sub-transistors serially connected between the gate node and a drain of the first transistor; a fourth transistor to transfer an initialization voltage to the gate node in response to an initialization signal, and including third and fourth sub-transistors serially connected between the gate node and the initialization voltage; and an organic light emitting diode including a cathode connected to a second power supply voltage. At least one of the second and fourth sub-transistors includes a bottom electrode.

Abstract: A freight vehicle on which a drone is docked, may include: a transfer device provided in the vehicle and configured to move up and down between an internal space of the vehicle and a roof to receive freight from the drone through the roof of the vehicle or transfer freight to the drone; and a loadspace separated, as a portion of the internal space of the vehicle, from a space where the transfer device is provided and including an open portion formed on a side or a rear of the vehicle, and onto which the freight is loaded.

Abstract: A method of driving a crack detector of an organic light emitting display device according to example embodiments includes: determining an image load of a display panel with respect to image data corresponding to an emission period of the organic light emitting display device when it is driven according to a simultaneous emission driving method, calculating a first sensing value corresponding to a power current that flows into a power supply during the emission period, determining a first crack reference value based on the image load, and determining whether the display panel is cracked by comparing the first crack reference value with the first sensing value.

Abstract: A data driver capable of displaying images with a substantially uniform brightness, an organic light emitting display device using the same, and a method of driving the organic light emitting display device. The data driver includes a plurality of current sink units for controlling predetermined currents to flow through data lines, a plurality of voltage generators for resetting values of gray scale voltages using compensation voltages generated when the predetermined currents flow, a plurality of digital-to-analog converters for selecting one gray scale voltage among the gray scale voltages as a data signal in response to bit values of the data supplied from the outside, and a plurality of switching units for supplying the data signal to the data lines. The predetermined currents may be set equal to pixel currents that correspond to a maximum brightness.

Abstract: A data driver capable of displaying images with a substantially uniform brightness, an organic light emitting display device using the same, and a method of driving the organic light emitting display device. The data driver includes a plurality of current sink units for controlling predetermined currents to flow through data lines, a plurality of voltage generators for resetting values of gray scale voltages using compensation voltages generated when the predetermined currents flow, a plurality of digital-to-analog converters for selecting one gray scale voltage among the gray scale voltages as a data signal in response to bit values of the data supplied from the outside, and a plurality of switching units for supplying the data signal to the data lines. The predetermined currents may be set equal to pixel currents that correspond to a maximum brightness.

Abstract: A data driver capable of displaying images with a substantially uniform brightness, an organic light emitting display device using the same, and a method of driving the organic light emitting display device. The data driver includes a plurality of current sink units for controlling predetermined currents to flow through data lines, a plurality of voltage generators for resetting values of gray scale voltages using compensation voltages generated when the predetermined currents flow, a plurality of digital-to-analog converters for selecting one gray scale voltage among the gray scale voltages as a data signal in response to bit values of the data supplied from the outside, and a plurality of switching units for supplying the data signal to the data lines. The predetermined currents may be set equal to pixel currents that correspond to a maximum brightness.

Abstract: A method of driving a crack detector of an organic light emitting display device according to example embodiments includes: determining an image load of a display panel with respect to image data corresponding to an emission period of the organic light emitting display device when it is driven according to a simultaneous emission driving method, calculating a first sensing value corresponding to a power current that flows into a power supply during the emission period, determining a first crack reference value based on the image load, and determining whether the display panel is cracked by comparing the first crack reference value with the first sensing value.

Abstract: A data driver capable of displaying images with a substantially uniform brightness, an organic light emitting display device using the same, and a method of driving the organic light emitting display device. The data driver includes a plurality of current sink units for controlling predetermined currents to flow through data lines, a plurality of voltage generators for resetting values of gray scale voltages using compensation voltages generated when the predetermined currents flow, a plurality of digital-to-analog converters for selecting one gray scale voltage among the gray scale voltages as a data signal in response to bit values of the data supplied from the outside, and a plurality of switching units for supplying the data signal to the data lines. The predetermined currents may be set equal to pixel currents that correspond to a maximum brightness.

Abstract: A data driver capable of displaying images with a substantially uniform brightness, an organic light emitting display device using the same, and a method of driving the organic light emitting display device. The data driver includes a plurality of current sink units for controlling predetermined currents to flow through data lines, a plurality of voltage generators for resetting values of gray scale voltages using compensation voltages generated when the predetermined currents flow, a plurality of digital-to-analog converters for selecting one gray scale voltage among the gray scale voltages as a data signal in response to bit values of the data supplied from the outside, and a plurality of switching units for supplying the data signal to the data lines. The predetermined currents may be set equal to pixel currents that correspond to a maximum brightness.

Abstract: A data driver and a light emitting diode display device including the circuit that cause a pixel current through the light emitting diode to be independent of the threshold voltage of a transistor driving the light emitting diode. The data driver includes a voltage digital-analog converter for generating a data voltage and a current digital-analog converter for generating a sensing current, both corresponding to input data, and a voltage control block for receiving the pixel current that corresponds to the data voltage and is fed back from the pixel to the voltage control block changing the amount of current charging a capacitor in the voltage control block and controlling the data voltage supplied to the pixel. Controlling and adjusting the data voltage helps uniformity in the display brightness regardless of non-uniformity of transistors in each pixel.

Abstract: A data driver and an organic light emitting display device including the data driver. The data driver including a shift register part to generate sampling signals in sequence, a latch part to store external data in response to the sampling signals, a current digital-analog converter to generate a data current corresponding to the data stored in the latch part, and a comparator producing a current corresponding to the difference between a pixel current and the data current. The comparator compares the pixel current fed back from each pixel with the data current, controls the data voltage by increasing or decreasing the current output, and supplies the controlled data voltage to the pixel. By controlling the data voltage an image is displayed with desired brightness regardless of non-uniformity of transistors in each pixel.

Abstract: An OLED pixel, an organic light emitting display comprising the same, and a driving method thereof in which a uniform image is displayed regardless of differences among transistor characteristics are disclosed. The organic light emitting display comprises a plurality of pixels connected to a plurality of scan lines, a plurality of data lines, and a plurality of power source lines. Each pixel comprises a frequency supplying line to supply a frequency signal having a frequency corresponding to a sub-frame, a pixel circuit to supply current from the power source line on the basis of a data signal and the frequency signal, and an organic light emitting diode configured to emit light depending on the output current from the pixel circuit.

Abstract: A data driving circuit for a light emitting display may include a gamma voltage generator that generates gradation voltages, a current sink that receives a predetermined current from a pixel via a data line during a first partial period of one complete period for driving the pixel, a voltage generator that generates an incrementally increasing compare voltage during the first partial period, a comparator that compares a compensation voltage generated based on the predetermined current with the compare voltage and generates a logic signal based on a result of the compare, an adjusting unit that generates compensation data based on the logic signal, and a digital-analog converter that generates a composite data using the compensation data and externally supplied data and selects, as a data signal for the pixel, one of the plurality of gradation voltages based on a bit value of the composite data.

Abstract: A data driving circuit for driving pixels of a light emitting display to display images with uniform brightness may include a gamma voltage unit that generates a plurality of gray scale voltages, a digital-analog converter that selects, as a data signal, one of the plurality of gray scale voltages using first data, a decoder that generates second data using the first data, a current sink, a voltage controller that controls a voltage value of the data signal using the second data and a compensation voltage generated based on the predetermined current, and a switching unit that supplies the data signal to the pixel during any partial period of the complete period elapsing after the first partial period. The current sink receives a predetermined current from the pixel during a first partial period of a complete period for driving the pixel based on the selected gray scale voltage.

Abstract: A data driver to display an image with desired brightness, and an organic light emitting display device using the same. The data driver includes a register to temporarily store external data; a voltage digital-analog converter to generate a data voltage corresponding to the data stored in the register part; a current digital-analog converter to generate a data current corresponding to the data stored in the register part; a buffer part to supply the data voltage as a data signal to pixels via a data line; a data control unit to receive a pixel current corresponding to the data voltage from the pixel via the data line and to control a digital value of the data stored in the register part; and a selection unit to selectively couple the data line with either of the buffer part or the data control unit.

Abstract: Disclosed are an organic electroluminescence display having simple configurations of a pixel circuit and a driving circuit by using a frequency characteristic of an organic electroluminescence device to display a gray level, and a driving method thereof. The present invention provides an organic electroluminescence display including a plurality of scan lines for transmitting a scan signal; a plurality of data lines for transmitting a digital data signal; a plurality of emission control lines for transmitting an emission control signal; and a plurality of pixels defined by a plurality of power supply lines for supplying a power supply, wherein the scan signal is transmitted to a plurality of subframes, and the emission control signal have different frequencies in a plurality of the subframes, and a driving method thereof.

Abstract: An organic electroluminescence display transmits a data driving voltage to a data driving unit to make different a voltage of the data signal outputted from the data driving unit, the data driving voltage being in a different level in every subframe according to the digital data signal, and displaying a desired grey level of an image by allowing a desired subframe to emit light according to the number of bits of the data signal, and a driving method thereof. An organic electroluminescence display includes a plurality of scan lines to transmit a scan signal; a plurality of data lines to transmit a digital data signal; and a plurality of pixels defined by a plurality of power supply lines to supply power, wherein the scan signal is transmitted to a plurality of subframes, and ON signals of the digital data signal have different voltages in a plurality of the subframes.

Abstract: Circuits for a pixel in a light emitting display capable of displaying an image with desired brightness are described. The pixel circuit includes a driver to supply a pixel current to the light emitting device corresponding to a data signal supplied from a data line, a first switching unit coupled between the driver and the data line, and a second switching unit coupled between the data line and a common node formed between the driver and the light emitting device. The driver, in turn, includes a first transistor to generate the pixel current to be supplied from a first power line to the light emitting device, a first capacitor coupled between the first transistor and the first switching unit to be charged with a voltage corresponding to the threshold voltage of the first transistor, and a second capacitor to be charged with a voltage corresponding to the data signal.

Abstract: A data driving circuit for displaying an image with a desired brightness comprises: a current digital-analog converter for generating a gradation current corresponding to external data, and for receiving a first current corresponding to the gradation current from a pixel via a data line; a current control unit for receiving a pixel current from the pixel via the data line, and for selectively increasing and decreasing a level of the first current in accordance with the received pixel current; and a selection unit for selectively connecting the data line to either the current digital-analog converter or the current control unit. An organic light emitting diode and a method of driving same are similarly configured. With these configurations, an image is displayed with desired brightness.

Abstract: A data driving circuit including: a voltage digital-analog converter adapted to generate a first gradation voltage corresponding to external data; a current digital-analog converter adapted to generate a gradation current corresponding to the external data; a voltage control unit adapted to receive a feedback pixel current from a pixel via a data line and to generate a second gradation voltage by increasing or decreasing a level of the first gradation voltage in accordance with the feedback pixel current; a buffer unit adapted to selectively supply the first or second gradation voltage to the data line; and a selection unit adapted to selectively connect the data line to either the buffer unit or the voltage control unit. With this configuration, an image is displayed with a desired brightness.