Abstract: In a level shifter, first and second PMOS transistors are connected in series between first and second power sources for supplying first high level and low level voltages, respectively, and a capacitor is formed between a contact point of the first and second transistors and the second transistor's gate. A third PMOS transistor is diode-connected and connected between the first and second transistors' gates. When a second low level voltage is input to the first transistor's gate, a second high level voltage is output to the contact point according to an on resistance ratio of the first and second transistors. When a first high level voltage is input to the first transistor's gate, the second transistor is bootstrapped according to the voltage charged to the capacitor so that a first low level voltage is substantially output to the contact point.

Abstract: Disclosed is a light emitting display device which provides a light emitting element for controlling the brightness according to the current to each pixel, such as an organic electroluminescent element, and a driving method thereof. The light emitting display device comprises transistors for forming a current mirror, and a pixel structure having first and second scan lines. A time to deselect the second scan signal that is supplied to the second scan line for writing display information on the pixel is earlier than a time to deselect the first scan signal that is supplied to the first scan line for selecting the pixel. As a result, reduction of brightness according to delay of the scan signal is prevented.

Abstract: A pixel circuit of a display device for improving an opening ratio and a contrast ratio of emitting devices by sharing a driving circuit and sequentially emitting the emitting devices. A data charging period and an emitting period of the emitting devices are divided to prevent flow of wrong data current while data is being stored. The pixel circuit includes red, green, and blue emitting devices and a sequential controller sequentially controlling emission of the emitting devices for a certain sub-frame of a frame. A driving device is coupled to the emitting devices for transmitting driving signals to the emitting devices. A compensation circuit outputs voltage for compensating a threshold voltage of the driving device. The sequential controller controls the emitting devices so that the emitting devices are emitted only for a particular period of time of the subframe.

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: A display system to display an image resulting from an image signal, comprising a color converting part which converts the image signal to change a color distributed in a color area grouped by a plurality of colors and formed as one of a variety of geometric shapes in a color space and the color is changed within the color area. The user interface generator provides one or more user interface components to visually accommodate the color change in the respective color areas without affecting the rest of the image.

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: A display panel of a light emitting display device includes a plurality of pixel circuits disposed in a matrix format. At least one of the pixel circuits includes a light emitting element, a transistor, a capacitor, a first switch, and a second switch. The transistor has first, second, and third electrodes and is for outputting a current corresponding to a voltage applied between the first and second electrodes to the third electrode. The light emitting element is for emitting light corresponding to the current outputted by the transistor. The capacitor is coupled between the first and second electrodes of the transistor. The first switch is for transmitting image signals to the first electrode of the transistor in response to a select signal, and the second switch is for electrically coupling the light emitting element to the third electrode of the transistor in response to an emit signal.

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 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.

Abstract: An emission control circuit for controlling emission of R, G, B EL elements and method for driving an organic light emitting diode display using the same. An emission control signal generating circuit of a flat panel display includes a plurality of pixels. Each pixel includes a plurality of EL elements, and emission of the elements is controlled by emission control signals. The circuit includes a first signal generating device for generating one of the emission control signals, and a plurality of second signal generating devices for generating other ones of the emission control signals using an output signal of the first signal generating device and an external control signal. The first signal generating device may include a shift register. Each of the plurality of second signal generating devices may include a NAND gate using the external signal and the external control signal, or an inverted signal thereof, as two inputs.

Abstract: Disclosed is a method for manufacturing a semiconductor device. The method comprises the steps of: providing a first substrate and a second substrate; forming a capacitor and a gate line on a first surface of the first substrate; forming an insulating layer on a resultant structure of the first substrate; bonding the second substrate to the insulating layer of the first substrate; turning a resultant structure over in such a manner that a second surface of the first substrate is an upper surface of the resultant structure; polishing the second surface of the first substrate by a predetermined thickness; forming an isolation layer for defining an active region by performing an isolation process with respect to the second surface of the first substrate for which a polishing process is finished; and forming a bit line on the active region in the first substrate.

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: 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: A light emitting display device including data lines, signal lines, pixel circuits, a data driver, and a precharger. Each pixel circuit includes a first switch, a transistor, a capacitor, and a light emitting element. The precharger supplies a precharge current of X times a data current to a corresponding data line in response to a control signal. When the first switch transmits the data current provided from the corresponding data line in response to a first level scan signal while the corresponding data line is precharged, a voltage corresponding to the data current is charged in the capacitor. A current corresponding to the charged voltage is supplied to the light emitting element through the transistor in response to a second level scan signal, and the light emitting element emits light.

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 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: A display device for displaying a predetermined color during an interval. The display device includes a plurality of pixels, each said pixel having at least two light emitting elements. Each light emitting element emits a corresponding color within the interval. Some of the light emitting elements of two adjacent said pixels are grouped into a first light emitting element group and the remaining light emitting elements of the two adjacent said pixels are grouped into a second light emitting element group. The first light emitting element group and the second light emitting element group are time-divisionally driven, one of the first and second light emitting element groups being driven within a given period, thereby displaying the predetermined color within the interval. The interval is one frame, and the one frame is divided into two subframes.

Abstract: A demultiplexer using sample/hold circuits, and a display device using the same. The demultiplexer includes a first sample/hold circuit group with first and second sample/hold circuits for sampling the data current according to a first sampling order during a first interval, and programming the current corresponding to the sampled and stored data to at least two signal lines during a second interval. The demultiplexer further includes a second sample/hold circuit group with third and fourth sample/hold circuits for sampling the data current according to a second sampling order during a second interval, and programming the current corresponding to the sampled and stored data to the signal lines during a third interval. The first and second sampling orders in even the even frames are different from the sampling orders in the odd frames.

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.