Organic Light Emitting Diodes-Smart Elements For Displays

Organic light emitting diode-Smart component for display. An organic light emitting diode (OLED) is a light emitting diode (LED) whose emissive electroluminescent layer is composed of a film of organic compounds. This layer of organic semiconductor material is formed between two electrodes, at least one electrode transparentes.OLED can be used in television screens, computer monitors, small, portable system screens such as mobile phones and PDAs, watches, advertising, information and indication. OLEDs can also be used in light sources for general space illumination, and large light-emitting elements. OLEDs emit less light per unit area than inorganic solid basis LEDs.Les OLEDs have advantages over liquid crystal displays (LCDs). OLED displays require no backlight to function. Thus, they can display black levels deep and can be thinner and lighter than LCDs. The OLEDs with higher contrast ratios than LCD screens using cold cathode fluorescent lamps (CCFL) or more recently developed LED.OLED components: an OLED is a device which is 100-500 nanometers of thickness, about 200 times smaller than a human hair. OLEDs can have either two layers or three layers of organic matter in the latter design, the third layer helps transport electrons from the cathode to the emissive layer. In this article we focus on the design two couches.Une OLED consists of the following: 1. Substrate (transparent plastic, glass, aluminum) – The substrate supports the OLED .2. Anode (transparent) – The anode removes electrons (electrons adds “holes”) when a current passes through the device .3. The organic layers – These layers are made of organic molecules or polymères.4. Conductive layer – This layer is composed of organic molecules in plastic transport “holes” of the anode. A conductive polymer used in OLEDs is polyaniline.5. Cathode: The cathode gives electrons to the layer is com posed émissiveOLED an emissive layer, a conductive layer, a substrate, and anode and cathode terminals. The layers are made of organic molecules that conduct electricity. The layers have conductivity levels ranging from insulators to conductors, OLEDs are considered to semiconductor organiques.OLED consisted of a single organic layer of poly (p-phenylene vinylene). Multilayer OLEDs can have more than two layers device to improve the efficient and effective conductive properties, layers are selected using charge injection at electrodes by providing a more gradual profile electronic or block a charge to reach the opposite electrode and waste. . Diagram of a two-layer OLED: 1. Cathode (-), 2. Emissive Layer, 3. Emission of radiation, 4. Conductive layer 5. Anode (+) ofOLEDs Operation: OLEDs emit light in a manner similar to SLE, by a process called electrophosphorescence.Le process is as follows: 1. voltage is applied across the OLED .2. An electric current from the cathode to the anode through the organic layers (an electric current is a flow of electrons). The cathode gives electrons to the emissive layer of molecules organiques.L anode removes electrons from the conductive layer organiques.3 molecules. At the border between the emissive and the conductive layer, electrostatic forces bring the electrons and holes towards each other and they recombine. What happens near the emissive layer, because the holes in organic semiconductors are more mobile than electrons. Recombination leads to lower energy levels of electrons, accompanied by emission of radiation whose frequency is in the visible region. Hence the emissive layer is appelé.4. When this occurs, the electron gives up energy as a photon of light. OLEDs émetLight.5. The color of light depends on the type of organic molecule in the layer émissive.Les manufacturers several types of organic films on the same OLED screens produce couleurs.6. when the anode is placed at a negative potential with respect to the cathode, then move the holes and electrons Toth anode to the cathode, so they move away from each other and do not recombine. In this case OLED is not functioning as a transmitter of lumière.7. The intensity or brightness of light depends on the amount of electric current applied: the current addition, the brightest of the lumière8. OLED anode must have high work function cathode material which must have workfunction low. so generally the indium tin oxide is used as anode material. It is transparent to visible light and has a high work function which promotes injection of holes in the polymer layer. Metals such as aluminum and calcium are often used for the cathode where they have work functions which promote little electron injection layer in OLED polymèreTypes: There are several types of OLED and each différentes.1 guy uses. Matrix OLED passive2. In active matrix OLED3. Transparent OLED4. Top electroluminescent OLED5. OLED pliable6. White OLEDOLED passive matrix (PMOLED) PMOLEDs have bands cathode, organic layers and bands of the anode. The anode strips are arranged perpendicular to the cathode strips. The intersections of the cathode and the anode form the pixels where light is emitted. External circuitry applies current to selected strips of anode and cathode, determining which pixels are turned on and which pixels remain off. Again, the brightness of each pixel is proportional to the amount of current appliqué.PMOLEDs are easy to make, but they consume more energy than other types of OLED, mainly because of the power required for the circuit externally. PMOLEDs are most effective for text and icons and are best suited for small screens (2 – to 3-inch), such as those you find in cell phones, PDAs and MP3 players. Even with the external circuit, passive matrix OLEDs consume less power than LCD for the full moment.AMOLEDs have layers from the cathode, organic molecules and the anode, but the anode layer includes a thin film transistor (TFT) array that forms a matrix. Table TFT itself is the circuit that determines which pixels are lit to form a image.AMOLEDs consume less energy than PMOLEDs because the TFT array requires less power than the external circuits, so they are effective for large screens. AMOLED also have faster refresh rates suitable for video. The AMOLED are better uses for computer monitors, big screen TVs and electronic signs or billboards affichageTransparent OLEDs OLEDs are transparent only transparent components (substrate, cathode and anode) and when they are extinct, are up 85 percent as transparent as their substrate. When a transparent OLED display is activated, it lets the light in both directions. A transparent OLED may be either active or passive matrix. This technology can be used for the heads-up displays. TOLEDO can greatly improve contrast, making it much easier to display in full sun. This technology can be used in head-up displays, smart windows or applications actually emitting OLED OLED augmentéeTop High emitting substrate that is opaque or reflective. They are best suited to the design and active matrix. Manufacturers may use top-emitting OLEDs cards puce.OLED OLEDFoldable foldable substrates have very flexible sheet metal or plastic. Foldable OLEDs are very lightweight and durable. Their use in devices such as cell phones and PDAs can reduce breakage, a major cause for return or repair. Potentially, foldable OLED displays can be attached to fabrics to create “smart” clothes, such as clothing, outdoor survival with an embedded computer chip, cellphone, GPS receiver and sewn in elle.White OLED OLED OLEDWhite emit white light is brighter, more uniform and more efficient than those emitted by fluorescent lamps. White OLEDs also possess the true color of incandescents. Because OLEDs can be made in large sheets, they can replace fluorescent lamps that are currently used in homes and buildings. Their use could reduce energy costs for lighting. In the next section, we discuss the benefits and drawbacks of OLED technology and how it compares to regular LED and OLED technology LCD.Stacked OLEDStacked (soles ) uses a stacked pixel architecture sub-pixels red, green and blue on top of each other instead of side by side, causing a significant increase in color gamut and color depth, and greatly reduce divide the pixel. Currently, other display technologies have the RGB (and RGBW) pixels mapped next to each other a resolution lower potentiel.Inverted OLEDContrairement a conventional OLED, in which the anode is placed on the substrate, reversed OLED (IOLED) uses a cathode bottom, which can be connected to the end of a drain N-channel TFT especially for motherboards, low-cost amorphous silicon TFT useful in the manufacture of AMOLED displays. [44] Benefits OLEDOLED offer many benefits to both the LCD and LED: 1. The plastic, organic layers of an OLED are thinner, lighter and more flexible than crystalline layers in an LED or LCD.2. Because the light emitting layer of an OLED are lighter, the substrate of an OLED can be flexible rather than rigides.3. OLED substrates can be plastic rather than glass used for LEDs and LCD.4. OLEDs are brighter than LED.5. Because the organic layers of OLEDs are much thinner than the corresponding layers of a crystal inorganic LEDs, emitting and conducting layers of an OLED can be multi-couches.6. LEDs and LCDs require glass for support and the glass absorbs light. OLEDs do not require verre.7. OLEDs do not require backlighting like LCDs. Since OLEDs generate light SE8. Because OLEDs do not require backlighting, they consume much less energy than LCDs. This is especially important for battery operated devices like telephones cellulaires.9. OLEDs are easier to produce and can be made for larger sizes. Because OLEDs are essentially plastics, they can be made large, leaves minces.10. OLEDs have large fields of view, about 170 degrees. OLEDs produce their own light, so they have a much wider range of visionnement.Inconvénients OLEDOLED seems to be the ideal technology for all types of screens, but it also has some problems: 1. Life – while red and green OLED films have longer lifetime (46,000 to 230,000 hours), organic matter present in blue have lifetime much shorter (to about 14,000 hours .- manufacturing processes are right dear maintenant.2. Water – Water can damage OLEDs facilement.questions couleursLe balance of material used to produce blue OLED degrades much more rapidly than other materials that produce colors Blue light output falls relative to other colors of light. This color change differential output will change the color balance of the screen and is much more sensitive than the overall decrease in luminance. This can be partially avoided by adjusting color balance, but may require control circuits and advanced user interaction, which is unacceptable for some utilisateurs.D other BusinessComponent Maximus Optimus keyboard developed by Art. Lebedev Studio published in early 2008 using 113 48 × 48-pixel OLED (10. 1 × 10. 1 mm) can be used clés.OLEDs its high resolution Holography (Volumetric display). Professor Orbit showed May 12, 2007, exhibition Lisbon World of the potential application of these materials to reproduce a video image in three dimensions. [edit] OLEDs could also be used as light sources in semiconductors. efficiency and lifetime of OLED already exceed those incandescent bulbs, and are studied worldwide OLED as a source of general lighting, an example is the EU project OLLA. [75] On March 11, 2008 GE Global Research has demonstrated the first successful roll- to-roll manufactured OLED, marking an important step toward the efficient production of OLED technology commercially. The fourth year, 13 million dollar research project was conducted by GE Global Research, Energy Conversion Devices, Inc. and the National Institute Standards and Technology. [76] [77] Chi Mei Corporation, Taiwan, demonstrated a 25 “low temperature polysilicon active matrix OLED Society Information Displays (SID) conference in Los Angeles, CA, USA on 20 to 22 May 2008.The June 5, 2009 DuPont has demonstrated a new material that can be printed, said solution deposition. The breakthrough is the ability to produce economically sustainable and scalable OLED screens at the International Symposium 2009 May 31 June 5, 2009, Henry B. Gonzalez Convention Center, San Antonio, TX, USAL’utilisation of OLED is also being studied to treat cancer by photodynamic therapy. [78] August 30 2009, South Korea’s LG Electronics said it would launch a 15-inch television set with the AM-OLED displays for sale in November. 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