Abstract: A scan driving circuit and an organic light emitting display using the same is disclosed. A first scan driver having a plurality of first stages sequentially outputs a selection signal, and a second scan driver having a plurality of second stages sequentially outputs an emission signal. Each of the first and second stages are configured so as to have substantially zero static current, and operation speed can be optimized without significant increase in power consumption.

Abstract: A cooperative communication method for vehicular communication is provided. The method in which when one vehicle transmits a signal to another vehicle, a signal of a transmission vehicle passes through a roadside device or a plurality of vehicles and thereafter signals having a plurality of paths are transmitted to a reception vehicle, and the reception vehicle combines and demodulates the signals received through the plurality of paths.

Abstract: An organic light emitting diode display device. A first capacitor is coupled between a gate of a first transistor and a first voltage source, and a second transistor is coupled between the gate of the first transistor and a second voltage source. A third transistor is coupled between the first voltage source and the gate of the first transistor, and a fourth transistor is coupled to a data line. A second capacitor stores the data voltage from the fourth transistor, and is for determining a gate-source voltage of the first transistor. The threshold voltage compensator compensates a threshold voltage of the third transistor together with the second capacitor, and the fifth transistor transmits a current of a drain of the first transistor to the organic light emitting diode. A photoelectric transformation element transmits a current corresponding to a light emitted by the organic light emitting diode to the second capacitor.

Abstract: Provided are a method and a system for transmitting and receiving a warning message that rapidly inform an adjacent hop of a dangerous situation that occurs on a road. The method for transmitting the warning message includes selecting one or more relay vehicles by using distances between vehicles and state information of the vehicles when the dangerous situation occurs on a road or outside, and increasing a warning message sequence number and generating and transmitting a warning message containing an identifier of the relay vehicle and a retransmission time.

Abstract: A light emission device according to the present invention includes a plurality of pixel circuits in a matrix. A plurality of first scan lines transmits a selection signal to select the pixel circuits. A plurality of second scan lines transmits an emission signal to control the duration of light emission of the pixel circuits. A scan driver sequentially delays a primary signal having a first-level pulse about a first period for generating a plurality of secondary signals, inverting the plurality of secondary signals for outputting the emission signal, and generating a signal having a second-level pulse when the secondary signal and the emission signal are in the first-level.

Abstract: An apparatus for time synchronization of an orthogonal frequency division multiplexing (OFDM) system oversamples a received signal using a master clock having a frequency at least four times higher than a minimum sampling frequency in a transmission apparatus, sets one of a plurality of oversampled signals to an on-time signal, and shifts each of the remaining oversampled signals by a predetermined time on the basis of the on-time signal. The apparatus for time synchronization calculates a correlation value by correlating each of the shifted signals and the on-time signal with a previously known signal, detects a maximum energy value among the calculated correlation values, and detects a start point of a frame by comparing the maximum energy value with a predetermined threshold value.

Abstract: An organic electroluminescent display and a demultiplexer, wherein the organic electroluminescent display comprising: a plurality of pixels displaying an image corresponding to output data current; a plurality of scan lines to transmit a scan signal to the plurality of pixels; a plurality of output data lines to transmit the output data current to the plurality of pixels; a scan driver outputting the scan signal to the plurality of scan lines; a demultiplexer comprising a plurality of demultiplexing circuit; and a data driver outputting input data current to the demultiplexer, wherein the demultiplexing circuit transmits the input data current after applying pre-charging voltage to the output data line selected among the output data lines in sequence.

Abstract: Disclosed is a display device using a demultiplexer. The demultiplexer sequentially samples the data current that is time-divided and applied by a data driver, and holds it to the data lines. Since the demultiplexer is to sample the data currents corresponding to N data lines during one horizontal period when performing 1:N demultiplexing, the data current corresponding to one data line is sampled during the 1/N horizontal period. In the present invention, a signal line coupled between the demultiplexer and the data driver is precharged with the current before coupling a precharge circuit to a sample/hold circuit and sampling the data current. The precharge current is M times the data current where M is a real number greater than 1.

Abstract: Disclosed is a display device using a demultiplexer. The demultiplexer sequentially samples data currents that are multiplexed and applied by a data driver, and holds currents corresponding to the sampled data currents to a plurality of data lines. Since the demultiplexer is to sample the data currents corresponding to N data lines during a horizontal period when performing 1:N demultiplexing, the data current corresponding to one data line is to be sampled during a 1/N horizontal period. A signal line coupled between the demultiplexer and the data driver is precharged with a precharge current before sampling the data current. According to one embodiment, the precharge current is M times the data current, where M is a real number greater than 1.

Abstract: In a display device, a demultiplexer is used to transmit a data current to a data line. The demultiplexer includes a plurality of sample/hold circuits for sampling the time-divided and sequentially input current and holding them to the data line. A plurality of data lines coupled to the demultiplexer are coupled to pixels of the same color, and hence, currents with different levels are transmitted to pixels of different colors. A sample/hold circuit for transmitting a higher level current uses a driving transistor having a larger ratio of a channel width and a channel length.

Abstract: A method for hybrid media access control for vehicle communication is provided. The method divides a radio channel into time slots, which are predetermined time units, and sets terminals as owners or non-owners for the divided time slots to be able to access the channel. Accordingly, it is possible to reduce the probability of contention by distributed access to the slots and provide a MAC protocol having excellent performance.

Abstract: A scan driver and an organic light emitting display (OLED) for selectively performing progressive scanning and interlaced scanning. The scan driver includes a plurality of scan units. A scan unit generates an odd-number scan signal or an even-number scan signal and includes a flip-flop and a scan signal generator. The scan signal generator performs a logical operation on output signals from the flip-flop and a mode selection signal, and outputs a signal. A logical operation can be performed on the output signal of the scan unit and an impulse signal to form a scan signal and an emission control signal. The OLED, which selectively performs the progressive scanning and the interlaced scanning in response to a mode selection signal, includes an emission driver for outputting an emission control signal and a program driver for outputting a scan signal and a boost signal.

Abstract: A display device including plural pixels, plural scan lines for applying scan signals to the pixels, plural first data lines for transmitting first data currents to the pixels, a scan driver for outputting the scan signals, a demultiplexer including plural demultiplexing circuits for demultiplexing second data currents into the first data currents, and for transmitting the first data currents to the plural first data lines, and a data driver for transmitting the second data currents. A demultiplexing circuit demultiplexes one of the second data currents into at least two first data currents, and transmits them to at least two first data lines. The number of the at least two first data lines is an integer multiple of the number of sub-pixels in each pixel. A display device and a demultiplexer having a simple structure data driver, where a stationary pattern due to demultiplexing is reduced or eliminated, can be provided.

Abstract: A scan driving circuit includes a plurality of stages. Each stage receives three of four clocks that may be sequentially generated, receives and delays an input signal through an input terminal, and outputs an output signal through an output terminal. The input terminal of each stage is connected to the output terminal of a previous one of the stages. Each stage includes a transistor, a switch section, and a storage section. The transistor turns off/on a connection of the input terminal according to a second clock. The switch section transfers a first voltage to the output terminal according to a first clock and prevents the first voltage from being transferred to the output terminal according to the input signal. The storage section maintains a voltage of the output terminal for a predetermined time and transfers a voltage of a third clock to the output terminal according to the input signal.

Abstract: A data current sample and hold circuit having an input terminal of a current source type and an output terminal of a current sink type. The sample and hold circuit includes a first transistor, a capacitor, and a plurality of switches, for sampling and holding the data current sunk to an output terminal of a data driver. When the sampled and held data current is applied to the data line, the data current is sunk to an output terminal of the sample and hold circuit. The sample and hold circuit is used together with a data driver having an output terminal of the current sink type.

Abstract: A driving device for a light emitting display, which includes a plurality of scan lines for transferring a selection signal, comprises: a first driver for shifting a first signal having a first integer multiple of first pulses by a first period, and sequentially outputting the first signal; a second driver for shifting a second signal having a second pulse by a second period, and sequentially outputting the second signal; and a third driver for sequentially outputting the selection signal having a second integer multiple of third pulses corresponding to at least one of the first integer multiple of first pulses, and a fourth pulse corresponding to the second pulse, in response to the first signal and the second signal.

Abstract: Provided is a system and method for automatically reconstructing a traffic accident. The accident reconstructing system includes a data collecting unit, a geographical data providing unit, and an accident analyzing unit. The data collecting unit collects/transmits accident-related data according to the occurrence of a traffic accident. The geographical data providing unit transmits the geographical data of the neighborhood of the accident site. The accident analyzing unit reconstructs the traffic accident virtually on the basis of the data outputted from the data collecting unit and the geographical data providing unit.

Abstract: A shift register circuit comprising a plurality of stages dependently connected to an initial input signal or an output signal of a previous stage and connected to first and second clock signals which are mutually inverted. Each stage includes eight switching devices interconnected together with three capacitors and interfaced through eleven interface points. Some of the interface points are connected to the first and second clock signals according to whether the stage is an even numbered stage or an odd numbered stage. Other ones of the interface points are connectable to the first and second clock signals in alternative ways to reduce power consumption without changing an internal configuration of the stage.

Abstract: A memory management apparatus and method for storing data in units of various packet sizes in appliances utilizing memory devices are provided. The memory allocation apparatus includes data memory which includes a plurality of data blocks, each of which includes a plurality of sub data blocks having a predetermined size, and when there is a request for allocating memory space of a variable size, allocates memory space in units of any one of the sub data blocks and the data blocks, a free list memory which manages an free memory space of the data memory as at least one or more lists, and registers that store head location information and tail location information of the list.

Abstract: Scan driving circuit having a number of stages coupled together in series and coupled with first and second lock signal input lines. Each of the stages receives a start signal or an output signal of a previous stage and includes a transfer unit, an inversion unit, and a buffer unit and produces the output signal. The output signal of each of the stages includes a low level signal, the low level signal of each stage is sequentially shifted by one half of the clock signal period with respect to the low level signal of a previous stage. The series of shifted low level signals form the scan signals output by the scan driving circuit for driving an organic light emitting display device.