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OLED introduction

OLED introduction

OLED introduction


Organic light-emitting diode (Organic Light-Emitting Diode, OLED) Also known as organic electroluminescent display, organic light-emitting semiconductor (Organic Electroluminesence Display, OED). And liquid crystal display (Liquid Crystal Display, LCD) is a different type of light-emitting principle. OLED by the Chinese-American professor Deng Qingyun (Ching W. Tang) in 1983 found in the laboratory, which launched a study of OLED. OLED display technology with self-luminous, wide viewing angle, almost infinitely high contrast, low power consumption, high response speed and so on. However, the price (large display panel), life, resolution, and LCD display can not match.

Organic light-emitting diodes can be divided into monochromatic, multicolored and full-color by color, among which the preparation of full-color organic light-emitting diodes is the most difficult. According to the driving methods, there are two types of passive light-emitting diodes (PMOLED) and active (AMOLED) ).





Organic light-emitting diodes (OLEDs) are a proprietary display technology developed by Kodak that uses organic polymeric materials as semiconductor materials in light-emitting diodes. The polymeric material may be natural or synthetic and may be very large or small in size. Proteins and DNA are examples of organic polymers.

OLED display technology is widely used in mobile phones, digital cameras, DVD players, personal digital assistants (PDA), notebook computers, car audio and television. The OLED display is thin and light because it does not use backlighting. The OLED display also has a wide viewing angle of up to 160 degrees, which operates from two to ten volts (in volts, V).

New OLED-based technologies include flexible organic light-emitting display technology (FOLED), which is likely to make future highly portable, foldable display technologies possible.


Born in Hong Kong in 1947, Professor Deng Qingyun Chinese-American found in the laboratory of organic light-emitting diodes, which is OLED, which launched the OLED study, in 1987, Professor Deng Qingyun and Van Slyke using ultra-thin filmTechnique, a double-layer organic electroluminescent device was fabricated by using transparent conductive film as anode, Alq3 as light-emitting layer, triarylamine as hole-transporting layer and Mg / Ag alloy as cathode. In 1990, Burroughes, who found the conjugated polymer PPV as the light-emitting layer of OLED, from around the world set off a wave of OLED research.Professor Deng is also known as the "father of OLED".

OLED technology in the two major systems, low molecular OLED technology is mainly concentrated in Japan, South Korea, China Taiwan, the three regions, while the polymer PLED mainly for the development of European manufacturers. In addition, the LG phone before the OEL is the use of OLED technology. OLED technology and patents by the British technology company CDT master. Compared to the two technical systems, OLED products, there are still color on the difficulties. While the low molecular OLED is easier to color.

However, although the future of better technology will replace the TFT OLED and other LCD, but the organic light-emitting display technology also has short life, the screen is large and difficult defects.

In order to illustrate the OLED structure, each OLED unit can be compared to a hamburger, luminescent material is caught in the middle of the vegetables. The display unit of each OLED can be controlled to produce three different colors of light. OLED and LCD, there are active and passive points. Passive mode by the row and column address selected unit of active light. Active mode, OLED unit, there is a thin film transistor (TFT), light-emitting unit in the TFT driver light. Active OLED power than the passive OLED, and display better performance.

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