Abstract: A light emitting display for compensating for the threshold voltage of transistor or mobility and fully charging a data line. A transistor and first through third switches are formed on a pixel circuit of an organic EL display. The transistor supplies a driving current for emitting an organic EL element (OLED). The first switch diode-connects the transistor. A first storage unit stores a first voltage corresponding to a threshold voltage of the transistor. A second switch transmits a data current in response to a select signal. A second storage unit stores a second voltage corresponding to the data current. A third switch transmits the driving current to the OLED. A third voltage determined by coupling of the first and second storage units is applied to a transistor to supply the driving current to the OLED.

Abstract: An organic light emitting display capable of displaying an image with uniform luminance regardless of deterioration of an organic light emitting diode and threshold voltage and/or mobility of a drive transistor is disclosed. The organic light emitting display senses deterioration of the organic light emitting diode and threshold voltage and/or mobility of a drive transistor and modifies the data supplied to the pixel according to the sensed parameters.

Abstract: An organic light emitting display includes: a sensing unit for extracting degradation information of an organic light emitting diode included in each of the pixels, and for transferring a first digital value and a second digital value corresponding to the extracted degradation information to a data driver; the data driver for generating data signals corresponding to second data supplied from a timing controller during a normal driving period; a first analog-digital converter for converting the voltage corresponding to the first digital value to a fourth digital value, and for converting the voltage corresponding to the second digital value to a fifth digital value; and the timing controller for storing the fourth digital value and the fifth digital value, and for changing first data supplied from an exterior in accordance with the fourth digital value and the fifth digital value to generate the second data.

Abstract: An organic light emitting display includes a plurality of pixels arranged at intersecting points of data lines, scan lines and light emitting control lines; a sensing unit extracting a signal corresponding to a degradation level of organic light emitting diodes provided in each of the pixels; a storage unit storing the signal obtained from the sensing unit, calculating degradation level information of the organic light emitting diodes using the stored signal and storing the calculated information; a conversion unit for converting an input data (Data) into a correction data (Data?) using the degradation level information stored in the storage unit; and a data driver for receiving the correction data (Data?) outputted from the conversion unit and generating data signals to be supplied to the circuits.

Abstract: An ambient light sensor circuit and a flat panel display device having same that can automatically control screen brightness by sensing ambient brightness and controlling an output current.

Abstract: A light emitting display for compensating for the threshold voltage of transistor or mobility and fully charging a data line. A transistor and first through third switches are formed on a pixel circuit of an organic EL display. The transistor supplies a driving current for emitting an organic EL element (OLED). The first switch diode-connects the transistor. A first storage unit stores a first voltage corresponding to a threshold voltage of the transistor. A second switch transmits a data current in response to a select signal. A second storage unit stores a second voltage corresponding to the data current. A third switch transmits the driving current to the OLED. A third voltage determined by coupling of the first and second storage units is applied to a transistor to supply the driving current to the OLED.

Abstract: A data driving circuit capable of displaying images having uniform brightness. The present invention provides a data driving circuit of a display device having: at least one current sinking unit for controlling a predetermined current to flow in a data line; at least one voltage generating unit for resetting voltage values of enhancement voltages using a compensation voltage generated when the predetermined current flows; at least one digital-analog converter for selecting as a data signal one of the enhancement voltages to correspond to a digital value of externally supplied data; at least one boosting unit for boosting a voltage value of the data signal; and at least one switching unit for providing the data line with the boosted data signal.

Abstract: An organic light emitting display including pixels, each including an organic light emitting diode and a pixel circuit for controlling a supply of an electric current to the organic light emitting diode; and a sensing unit for converting a voltage applied to the organic light emitting diode to a digital value during a sensing period during a sampling period, and for sinking a second current from the pixel corresponding to the digital value to compensate a degradation of the organic light emitting diode during a sampling period.

Abstract: A driving device for a display device includes a gray voltage generator generating a plurality of gray voltages, a voltage selector selecting an output voltage from the plurality of gray voltages, a voltage level converter converting a level of the output voltage selected by the voltage selector and applying the output voltage with a converted level to data lines, a first switching unit connecting the voltage level converter to the voltage selector and the data lines, and a second switching unit directly connecting the voltage selector and the data lines. Operating times of the first and second switching units are different. Accordingly, when a data voltage is charged in or discharged from a data line, since a separate discharging transistor or a separate discharging amplifier is not used, power consumption and an area of a data driver are reduced.

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: In a pixel of a display device, a first transistor of which an second terminal is connected to a first terminal of a light emitting element supplies a driving current that corresponds to a voltage between a control terminal and the second terminal to the light emitting element, and a second terminal of the light emitting element is connected to a driving voltage. At least one second transistor transmits a black voltage that corresponds to a black gray to the control terminal of the first transistor in a first period and a second period, and transmits a gray voltage that corresponds to an input image signal to the control terminal of the first transistor in a third period. A third transistor is connected between the first terminal of the light emitting element and a voltage supply line to transmit a reference voltage, and the third transistor is turned on in the first period and turned off in the second period.

Abstract: A flat panel display device including: a display region including pixels connected to scan lines and data lines; a dummy display region including dummy pixels connected to at least two dummy scan lines and the data lines; a scan driver for providing scan signals and dummy scan signals to the scan lines and the dummy scan lines; a data driver for generating gray scale voltages corresponding to input digital data and providing them to corresponding pixels through the data lines; and a timing controller for controlling the scan driver and the data driver, wherein the data driver uses parasitic capacitance components existing in at least two data lines and capacitance components in the pixels and the dummy pixels connected to the at least two data lines, as a sampling capacitor and a holding capacitor to generate the gray scale voltages through charge sharing between the at least two data lines.

Abstract: A data driving circuit for displaying uniform images, a light emitting display device using the same, a driving method thereof. The data driving circuit includes a holding latch part including a plurality of holding latches for storing data, a signal generation part including a plurality of digital-analog converters for receiving the data and for generating data signals, a first switching part located between the holding latch part and the signal generation part, and a second switching part electrically connected to the signal generation part, the second switching part being for transmitting the data signals to data lines, wherein the first switching part electrically connects the respective holding latches to the respective digital-analog converters differently during a previous frame than during a current frame. As such, the data driving circuit may diffuse errors of the digital-analog converters to display uniform images.

Abstract: An organic light emitting diode (OLED) display comprises: an OLED; a driving transistor for supplying driving current to the OLED; a data line for transmitting a corresponding data signal to the driving transistor; a first transistor having a first electrode connected to one electrode of the OLED and a second electrode connected to the data line; and a second transistor having a first electrode connected to the data line and a second electrode connected a gate electrode of the driving transistor, wherein the first transistor, the second transistor, and the driving transistor are turned on, a first current and a second current are respectively sunk in a path of driving current from the driving transistor to the OLED through the data line, and a threshold voltage and mobility of the driving transistor are calculated by receiving a first voltage and a second voltage applied to the gate electrode of the driving transistor corresponding to sinking of the first current and the second current through the second tran

Abstract: A data driver adapted to display an image with substantially uniform brightness is provided. The data driver includes a holding latch unit including holding latches for storing data, a signal generator including digital-analog converters for receiving the data to generate data signals, a first switching unit provided between the holding latch unit and the signal generator, and a second switching unit coupled to the signal generator to transmit the data signals to data lines. The first switching unit couples the holding latches to the digital-analog converters during a horizontal period in a manner different from the manner in which the holding latches and the digital-analog converters are coupled to each other during a previous horizontal period. Therefore, errors of the digital-analog converters are diffused so that it is possible to display an image with substantially uniform brightness.

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 digital-analog converter (DAC) including: a gray scale generator for generating gray scale voltages corresponding to digital data input through charge sharing between a plurality of data lines and a plurality of dummy data lines; a switching signal generator for providing operation control signals for a plurality of switches of the gray scale generator; and a reference voltage generator for generating reference voltages and for providing the reference voltages to the gray scale generator. According to the present invention, the digital-analog converter uses capacitance components existing in the respective data lines and the dummy data lines as a sampling capacitor and a holding capacitor to generate desired gray scale voltages through charge sharing between the data lines and the dummy data lines, thereby reducing area and power consumption over an existing R-string type of DAC.

Abstract: Provided are a touch screen and a method for compensating sensing capacitance variations and offset variations thereof. The touch screen includes: a touch panel where a plurality of driving lines and a plurality of sensing lines intersect and are wired; a driving unit for activating the driving lines sequentially; an input unit for measuring a sensing capacitance formed in a sensing line corresponding to an activated driving line; a multiplexer for serializing and outputting the measured sensing capacitance; an analog-to-digital converter for sampling the sensing capacitance outputted from the multiplexer by reflecting an initial sensing capacitance as an offset and performing analog-to-digital conversion for the sampling result; and a host processor for determining a touch event in response to the analog-to-digital conversion result.

Abstract: A data driving circuit for driving pixels of a light emitting display to display images with uniform brightness may include a current sink that is capable of receiving, via a data line, a predetermined current from a pixel to enable the data driving circuit to generate a compensation voltage for the pixel. The compensation voltage may compensate for variations among the pixels of the display. Variations among the pixels may result from different electron mobilities and/or threshold voltages of transistors included in the pixels. The value of the predetermined current may be equal to or higher than a value of a minimum current employable by the pixel to emit light of maximum brightness. The maximum brightness of the pixel may correspond to a brightness emitted by the pixel when a highest one of a plurality of set gray scale voltages is applied to the pixel.

Abstract: A display device including a display unit including a plurality of data lines for transmitting data currents, a plurality of scan lines for transmitting scan signals, and a plurality of pixel areas defined by the data lines and the scan lines; a data driver for converting a plurality of grayscale data that include first data and second data into at least one of the data currents, and applying the at least one of the data currents to at least one of the data lines; and a scan driver for sequentially applying the scan signals to the plurality of scan lines, and wherein the data driver divides the plurality of grayscale data into at least two grayscale ranges including a first grayscale range, outputs a first current of the first grayscale range including at least one of the plurality of grayscale data by using the first data, and outputs a second current that corresponds to the second data in the first grayscale range.