Dengqingyun, a Chinese-American professor who was born in Hong Kong in 1947, discovered an organic light-emitting bipolar, or OLED, in the laboratory, and developed a study of OLED, and in 1987, Professor Dengqingyun and Van Slyke used ultrathin film technology to use a transparent conductive film as an anode, Alq3 as a luminous layer, The Tri-aromatic amine is used as the hole transport layer, and the MG/AG alloy is used as cathode, and a double-layer organic light-emitting device is made. 1990, Burroughes and other people found that the conjugated polymer PPV as the light-emitting layer of OLED, from now on around the world set off OLED research boom. Professor Deng is also known as "the father of the OLED".
In the two major OLED technology systems, low molecular OLED technology is mainly concentrated in Japan, South Korea, China Taiwan three areas, and the pled of polymer mainly for European manufacturers. In addition, the previous LG mobile phone OEL is also the use of OLED technology. OLED technology and patents are controlled by the British technology company CDT. Compared with the two technical systems, there are still some difficulties in the color of pled products. Low molecular OLED is more easily colored.
However, although the future of better technology OLED will replace TFT and other LCD, but the organic light-emitting display technology also has a short service life, the screen large and difficult defects.
To illustrate the OLED construct, each OLED unit can be compared to a hamburger, and the luminescent material is the vegetables sandwiched in the middle. Each OLED display unit is controlled to produce three different colors of light. OLED and LCD, but also active and passive points. Passive light is active by the unit selected by the row and column address. Active mode, the OLED unit has a thin film transistor (TFT), light-emitting unit in the TFT-driven light. Active OLED is more power-saving than passive OLED and displays better performance.