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OLED display

Organic light-emitting device (OLED) display is a flat panel display device with a high electrical-to-photonic energy conversion efficiency. An OLED display emits OLED elements selected by each switching element to show the OLED elements. Thin film transistors (TFT) are used as switching elements. Organic light-emitting diode (OLED) technology incorporates organic luminescent materials that, when sandwiched between electrodes and subjected to a DC electric current, produce intense light of a variety of colors. These OLED structures can be combined into the picture elements or pixels that comprise a display. The organic electroluminescent media supports recombination of holes and electrons that yields emission of light. These devices are also commonly referred to as organic light-emitting diodes, or OLEDs. Organic electroluminescent elements are configured by sandwiching a material layer between an anode and a cathode. The material layer may comprise a plurality of layers, such as an electron-injecting layer or a hole-injecting layer and an electron-transporting layer or a hole-transporting layer. Its emitting principle is similar to that of the emitting mechanism of light emitting diodes (LED). In a common OLED color display device a pixel includes red, green, and blue colored OLEDs. By combining the illumination from each of these three OLEDs in an additive color system, a wide variety of colors can be achieved. OLEDs may be used to generate color directly using organic materials that are doped to emit energy in desired portions of the electromagnetic spectrum. OLED display panels are frequently used in mobile phones, personal digital assistants (PDAs) and various other types of flat display devices. OLEDs are also useful in a variety of applications as discrete light-emitting devices or as the active element of light-emitting arrays or displays, such as flat-panel displays in watches, telephones, laptop computers, pagers, and calculators. In particular, an OLED may be an alternative to liquid crystal (LC) materials and structures in displays, because the liquid crystal materials and structures tend to be more complicated in form and more limited in application.


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