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 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: 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: 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.

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: Disclosed is a display device using a demultiplexer. The demultiplexer sequentially samples data currents that are time-divided and applied by a data driver, and holds them 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. According to one embodiment, a signal line coupled between the demultiplexer and the data driver is precharged with particular voltage before sampling the data current. The precharge voltage is sufficient to allow current transmitted to the signal line to be substantially sampled within a a given sampling time after the precharge voltage is applied.

Abstract: A display device including a plurality of data lines for transmitting a data current corresponding to image signals, a plurality of scan lines for selecting select signals, and a plurality of pixel circuits coupled to the data lines and the scan lines. The display device includes a data driver for supplying the data current corresponding to the image signals, and a demultiplexer including first and second sample/hold circuit groups having input terminals coupled to the data driver. Each of the sample/hold circuit groups includes at least two sample/hold circuits. The display device also includes a switch unit for switching between output terminals of the first and second sample/hold circuit groups and the data lines, and a scan driver for supplying the select signals to the scan lines.

Abstract: A scan driver that selectively performs progressive scanning and interlaced scanning and a display using the same. The scan driver includes a shift register having a plurality of flip-flops arranged in series, an odd line selection unit having a plurality of NAND gates, and an even line selection unit having a plurality of NAND gates. In response to an odd line control signal and an even line control signal input to the odd line selection unit and the even line selection unit, respectively, the scan driver performs progressive scanning or interlaced scanning. The scan driver may also include a mode selection unit to selectively perform progressive scanning or interlaced scanning in response to a mode selection signal.

Abstract: A display device includes a plurality of pixel circuits formed in a matrix; a plurality of first scan lines for transmitting selection signals to select one or more of the pixel circuits; a plurality of second scan lines for transmitting emission control signals to control the duration of one or more emissions of the selected one or more pixel circuits; and a scan driver for sequentially delaying a primary signal. The primary has a pulse at a first level at about a first period for generating a plurality of secondary signals. The plurality of secondary signals are inverted for outputting the emission control signals, and a signal is generated having a pulse at a second level when at least one of the secondary signals and at least one of the emission control signals are at the first level.

Abstract: A display device includes a demultiplexer. The demultiplexer programs time-divided and sequentially input data currents to at least two signal lines. The demultiplexer includes first and second sample/hold circuits for alternately sampling data currents and holding sampled data corresponding to the sampled data, and third and fourth sample/hold circuits for respectively sampling the sampled data held by the first and second sample/hold circuits and programming the current which correspond to the sampled data to the two signal lines.

Abstract: In a display device using a demultiplexer, two power cables for transmitting external power supply voltages to a display device are formed on the top and the bottom of a substrate, and are coupled to both ends of vertical lines for transmitting power supply voltages to pixels in the display area. Power supply points are respectively formed on both ends of the two power cables and receive external power supply voltages. Accordingly, voltage dropping generated in the vertical lines and the power cables is reduced.

Abstract: An image display device having a reduced data programming time. The image display device includes a plurality of pixel circuits, each said pixel circuit for displaying an image which corresponds to a data current, which is applied thereto. The image display device also includes a plurality of data lines for transmitting the data currents to the pixel circuits, and a plurality of scan lines for transmitting select signals to the pixel circuits. A driver applies a precharge voltage to a corresponding one of the data lines in response to a first control signal, and supplies the corresponding one of the data currents to the corresponding one of the data lines in response to a second control signal.

Abstract: A light emitting display device includes a data line, first and second signal lines, a pixel circuit, and a data driver for supplying a precharge current to the data line according to a first control signal and supplying a data current to the data line according to a second control signal. The data line can be precharged by driving at least one pixel circuit adjacent to a reference pixel circuit in addition to the reference pixel circuit to which the data current will be supplied when the precharge current is supplied to the data line.

Abstract: An emission display includes data lines, select signal lines, emit signal lines, and pixel circuits including switches, a transistor, and an emission element. The first switch transmits a data current from the data line in response to a first scan signal from the select signal line, and the capacitor charges a voltage corresponding to the data current from the first switch. The second switch supplies the current from the transistor to the emission element in response to a second scan signal having a first level from the emit signal line during a display period. During a non-display period, the second switch is turned off in response to the second scan signal having a second level, and no current from the transistor is supplied to the emission element.

Abstract: A display device includes a demultiplexer. The demultiplexer programs time-divided and sequentially input data currents to at least two signal lines. The demultiplexer includes first and second sample/hold circuits for alternately sampling data currents and holding sampled data corresponding to the sampled data, and third and fourth sample/hold circuits for respectively sampling the sampled data held by the first and second sample/hold circuits and programming the current which correspond to the sampled data to the two signal lines.

Abstract: A display device including a data driver for supplying data currents corresponding to image signals, and a demultiplexer including first and second sample/hold circuit groups having input terminals coupled to the data driver. Each said sample/hold circuit group includes at least two sample/hold circuits. The display device also includes a switch unit for switching between output terminals of the first and second sample/hold circuit groups and data lines, and a scan driver for supplying select signals to scan lines. One of the sample/hold circuits of the first sample/hold circuit group samples a corresponding one of the data currents during at least a part of a period in which another one of the sample/hold circuits of the first sample/hold circuit group outputs a current to the switch unit. Orders in which the data currents are supplied from the data driver are varied.