200 results about "Organic light-emitting transistor" patented technology

There is provided a method for driving an organic light emitting diode (OLED) pixel circuit. The method includes applying a first signal to a terminal of the OLED when setting a state of the pixel circuit, and applying a second signal to the terminal when viewing the state. There is also provided a driver for an OLED pixel circuit, where the driver employs this method.

A vertical organic thin film transistor is provided along with an organic light-emitting transistor, which is characterized in that an active layer is formed of a p-type organic semiconductor compound having a dielectric constant of 3.5 or more, and work function values of an anode and a cathode are different from each other. The vertical organic thin film transistor is advantageous because it exhibits excellent current-voltage properties due to a short channel length, and has simple fabrication processes. Also, in the vertical organic thin film transistor, current properties in response to the gate voltage are of an enhancement type. Therefore, the vertical organic thin film transistor may be fabricated into the organic light-emitting transistor through a simple process.

An organic light emitting display device operating in a concurrent (e.g., simultaneous) emission method, which includes a first power driver configured to apply first power, which changes between a first low level and a first high level, to pixels of the display unit, and a second power driver configured to apply second power, which changes between a second low level and a second high level, to the pixels, wherein each of the pixels includes an organic light emitting diode, a driving transistor configured to control an amount of current supplied to the organic light emitting diode, and an initializing transistor coupled to an anode electrode of the organic light emitting diode and configured to be turned on during a reset period in one frame to supply a reset voltage, which is lower than the first high level of the first power, to the anode electrode of the organic light emitting diode.

The invention is directed to an organic electroluminescent (EL) display device having an improved light extracting efficiency due to a photonic crystal layer formed proximate one side of a stack. Among other elements, the stack may include a first electrode formed on a substrate, an organic light emitting layer formed above the first electrode, and a second electrode formed above the organic light emitting layer. Additionally, the photonic crystal layer may be configured to correspond to a wavelength of colored light. An organic EL display device having an improved light extracting efficiency may be manufactured using a thermal transfer donor film to adhere the photonic crystal layer to the stack.

Disclosed is an organic light emitting display device including a pixel connected to a data line, a gate line group, and a reference line. The pixel includes an organic light emitting diode (OLED), a driving transistor configured to control a current flowing in the OLED, a first switching transistor configured to selectively supply a data voltage to a first node, a second switching transistor configured to selectively supply an initial voltage to a second node, a third switching transistor configured to selectively connect a third node to the reference line, a fourth switching transistor configured to selectively connect the first node to the third node, a first capacitor connected between the first and second nodes to store a threshold voltage of the driving transistor, and a second capacitor connected between the first and third nodes to store the data voltage supplied through the first switching transistor.

An organic light emitting diode (OLED) display module is provided wherein the aperture ratio of the respective pixels thereof improves and such display faults as line defect is prevented so as to allow image to be displayed with high quality. The display module is provided with a capacitor, a first terminal of which is connected to an output terminal of the first transistor as selected by the scanning line and a second terminal of which is connected to the gate placed anterior thereto, wherein the electric current is supplied to an organic emitting device in response to the data signal as supplied from the data line through the second transistor, which turns into on-state condition when the first transistor is put into an off-state condition, and as stored in the capacitor.

The invention provides a light-emitting element driving circuit, a pixel circuit, a display panel, and a display. When the frame of the driving circuit (5T1C) is cooperated with a proper operating waveform, the current cross an organic light emitting diode cannot change along the power supply voltage (Vdd) under the influences of current, resistance, and voltage drops, and cannot change along the threshold voltage shift (Vth shift) for driving the thin film transistor of the organic light emitting diode. Therefore, the brightness uniformity of the organic light emitting diode display using the same can be greatly improved.

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.

Devices, structures, materials and methods for vertical light emitting transistors (VLETs) and light emitting displays (LEDs) are provided. In particular, architectures for vertical polymer light emitting transistors (VPLETs) for active matrix organic light emitting displays (AMOLEDs) and AMOLEDs incorporating such VPLETs are described. Porous conductive transparent electrodes (such as from nanowires (NW)) alone or in combination with conjugated light emitting polymers (LEPs) and dielectric materials are utilized in forming organic light emitting transistors (OLETs). Combinations of thin films of ionic gels, LEDs, porous conductive electrodes and relevant substrates and gates are utilized to construct LETs, including singly and doubly gated VPLETs. In addition, printing processes are utilized to deposit layers of one or more of porous conductive electrodes, LEDs, and dielectric materials on various substrates to construct LETs, including singly and doubly gated VPLETs.

The invention describes an organic light emitting display panel and a driving method therefor. The organic light emitting display panel comprises at least one first circuit and a plurality of second circuits; the first circuit comprises a signal generating unit, a signal input control unit and a signal detecting unit. Each second circuit comprises a first transistor. The first circuit is connected with the second circuits via data cables, and the first circuit is used for capturing and compensating threshold value of the first transistor of each second circuit. The organic light emitting display panel and the driving method therefor can effectively solve problems that display is not uniform due to threshold voltage shift, an organic light emitting diode is still turned on stealthily during threshold value compensation processes, and node electric potential cannot be accurately written in during the threshold value compensation processes.

An organic light emitting diode display includes: first gate wires provided on a substrate with a first insulation layer therebetween and extended in a first direction; second gate wires provided on a second insulation layer above the first insulation layer and extended in the first direction; data wires provided on a third insulation layer above the second insulation layer and extended in a second direction crossing the first direction; a pixel circuit connected to the first gate wires, the second gate wires, and the data wires; and an organic light emitting diode connected to the pixel circuit.

The invention relates to a flexible organic light emitting transistor display device, which comprises a substrate (1), a source electrode layer (2a), a drain electrode layer (2b), a charge injection layer (3), organic semiconductor layers (4, 5 and 6), a gate insulating layer (7) and a gate electrode layer (8), wherein the source and drain electrode layers (2a and 2b) are made of graphene. The charge injection layer is added, a charge injection material is selected, the drain and source electrode layers are made of the graphene, so that the flexible active matrix organic light emitting transistor display device is transparent and high in aperture opening ratio and brightness, low in operating voltage and long in service life.

A structure of a pixel and an organic light emitting display device using the same are provided. The pixel includes an organic light emitting diode; a first transistor controlling the amount of current supplied from a first power source to the organic light emitting diode depending on a voltage applied to a second node; a second transistor coupled between a data line and a first node, and turned on when a scan signal is supplied to a first scan line; a third transistor coupled between the first power source and the first node, and turned on when the scan signal is supplied to a second scan line; a fourth transistor coupled between the first power source and the second node, and turned on when the scan signal is supplied to the second scan line; and a storage capacitor coupled between the first and second nodes.

An active organic light emitting diode circuit and its operation method in the disclosure. Active organic light emitting diode circuit including organic light emitting diode, switching circuit, compensation circuit, drive circuit and reset circuit. Compensation circuit switch circuit is connected, and includes the first capacitor. Driving circuit to drive by compensation circuit, in order to provide an organic light emitting diode drive current. Reset circuit connected to the ends of the first capacitor, and connecting line. Reset circuit is used to according to the potential change in the first line of the potential at each end of the capacitor, in at one end of the first capacitor and the reference channel formed between the power, and the release of the first capacitor's charge.

A video game machine including one or more display devices utilizing organic light emitting diodes (OLEDs) or functionally equivalent technology to display moving and/or static information on curved portions of a display device such that the activity of the video reels flat slot machine display resembles the activity of mechanical reels, and so that user interface buttons and screens are more appealing. To facilitate fabrication of the curved portions of the display device, flexible OLED technology may be employed.

The invention provides a pixel circuit and a driving method therefor, and an organic light emitting display. The positive electrode of an organic light emitting diode is initialized by the pixel circuit through a first thin film transistor and a second thin film transistor; the gate electrode and the drain electrode of a sixth thin film transistor, taken as the driving element, are initialized through the first thin film transistor and a third thin film transistor; meanwhile, the overshoot current generated in the initializing process is eliminated through a seventh thin film transistor, so that the service life of the organic light emitting diode and the sixth thin film transistor is prolonged; and in addition, the current output by the sixth thin film transistor which is taken as the driving element is unrelated to the threshold value voltage of the sixth thin film transistor and the impedance of the power supply routing wires, so that uneven luminance caused by the threshold value voltage deviation of the thin film transistor and the difference of the impedance of the power supply routing wires can be avoided, and the display quality of the organic light emitting display is further improved.

An organic light emitting display device includes: a display unit including pixels coupled to scan lines and data lines; one or more control lines coupled to the pixels; a control line driver for supplying control signals to the pixels through the control lines; a first power driver for applying a first power having a low voltage level or a high voltage level to the pixels; and a second power driver for applying a second power having a low voltage level or a high voltage level to the pixels, in which each of the pixels includes: an organic light emitting diode (OLED); a driving transistor for controlling an amount of current supplied to the OLED; and an initializing transistor coupled to a gate electrode of the driving transistor and for supplying a reset voltage to the gate electrode of the driving transistor.

The invention relates to an active organic light-emitting diode (OLED) displayer and a driving method thereof. A compensation unit, a row driver and a column driver are arranged in the displayer, wherein the row driver and the column driver connect pixel arrays; a superimposer connected with a time schedule controller is arranged in the compensation unit; the time schedule controller is also connected with the row driver; the superimposer is connected with a storage, an A/D (alanog/digital) converter, a current detector and the column driver; a pixel unit of the pixel arrays comprises a first switch conduction element and a second switch conduction element of which control pins are simultaneously connected with the row driver; a data pin of the first switch conduct element is respectively connected with the column driver and a driving conduction element; a capacitor is arranged between an input pin and a control pin of the driving conduction element; the second switch conduction element is connected with the driving conduction element and the current detector; and the cathode of the OLED is connected to a power supply. The active organic light-emitting diode displayer can compensate for the factor causing poor image quality caused by inconsistent transfer characteristics of the driving conduction element, and improve the image quality of an AMOLED (active matrix/organic light emitting diode) displayer, and is simple in circuit structure.

The invention discloses a pixel unit circuit, which consists of a first sub-circuit module, a second sub-circuit module, a capacitor and an organic light emitting diode (OLED). The main working process of the pixel unit circuit is divided into a compensation stage and an evaluation stage. Compared with the traditional pixel unit circuit, the pixel unit circuit is characterized in that the degeneration of the OLED device, the threshold voltage heterogeneity of a thin film transistor (TFT) driving pipe and the IR drop of a rear panel power supply can be effectively compensated. In addition, because the pixel unit circuit provided by the invention is designed on the basis of the voltage feedback technology, the pixel unit circuit is suitable to apply to a big-size panel. In addition, the invention also correspondingly discloses a working method for the pixel unit circuit and an OLED display device comprising a plurality of pixel unit circuits connected in series.

The invention provides a threshold voltage detection method of an OLED (organic light emitting diode) driver thin film transistor. According to the method, by setting data signals, two different data voltages are offered, so that two different gate-source voltages are formed by virtue of the driver thin film transistor; then, by virtue of an external detection processing circuit, currents, passing through the driver thin film transistor under two different gate-source voltages, are detected; and by virtue of the two gate-source voltages, two current data and a calculating formula based on a driver thin film transistor current formula, a threshold voltage of the OLED driver thin film transistor is calculated by virtue of a central processing unit; therefore, the threshold voltage of the driver thin film transistor of each pixel in an OLED display device can be accurately acquired, and subsequently, a threshold voltage compensating effect of the OLED driver thin film transistor is improved and OLED display quality is enhanced.