OLED Features & Advantages

- Dec 21, 2020-

OLED: (short for Organic Light-Emitting Diode) is an organic light-emitting diode, also known as organic electric laser display, organic light-emitting semiconductor. The basic structure of OLED is a thin, transparent, semiconductor-like indium tin oxide (ITO), connected to the positive electrode of electricity, plus another metal cathode, wrapped in a sandwich structure. The entire structure layer includes: hole transport layer (HTL), light emitting layer (EL) and electron transport layer (ETL). When the power is supplied to an appropriate voltage, the positive electrode holes and the negative electrode charges will be combined in the light-emitting layer to produce light. The three primary colors of red, green and blue are produced according to their different formulations, forming the basic colors. The characteristic of OLED is that it emits light by itself, so it has high visibility and brightness, followed by low voltage requirements, high power saving efficiency, fast response, light weight, thin thickness, simple structure, and low cost. However, as a high-end display, the price will also be more expensive than LCD TVs. OLED display technology is widely used in mobile phones, digital video cameras, DVD players, personal digital assistants (PDAs), notebook computers, car stereos and TVs. The OLED display also has a wide-screen viewing angle of up to 160 degrees, and its working voltage is two to ten volts (denoted by V). New OLED-based technologies include flexible organic light-emitting display technology (Flexible OLED, FOLED), which may make highly portable, foldable display technology possible in the future.

OLED light-emitting principle: The principle of organic light-emitting is similar to that of light-emitting diodes. It also uses material properties to combine electrons and holes on the light-emitting layer. The electrons fall from the excited state to the ground state, and the excess energy is released in the form of waves. Luminous function. That's why it is called OLED and PLED. (OLED is a small molecule organic electroluminescence diode, PLED is a polymer organic electroluminescence diode.)

OLED structure: OLED uses the injection of electrons and holes between two electrodes, and uses the excitation of organic molecules to achieve the function of light emission. The anode is an ITO conductive glass film, which is attached to a glass or transparent plastic substrate by evaporation, while the cathode contains metals such as Mg, Al, and Li. Between the two electrodes is a light-emitting area formed by multiple organic thin films, including hole injection area, hole transport area, organic light-emitting layer and electron transport layer. In actual mass production, different needs are considered, and sometimes others are included. Different films.

OLED colorization method: At present, the green light technology of organic light-emitting diodes is the most mature, and blue and red light are still to be commercialized. The colors of organic light emitting diode displays are divided into monochromatic, multicolor and full color. Multicolor is composed of several monochromatic display areas, and each area is still monochromatic; full color is composed of repeated pixels of red, green and blue light. , The finer the pixel size, the higher the resolution.

Advantages of OLED: OLED has many advantages such as ultra-thin, good shock resistance, large viewing angle, short response time, good low temperature, high luminous efficiency, and power saving. OLED screen has many incomparable advantages of LCD, so It has also been favored by industry insiders. Therefore, since 2003, this display device has been widely used in MP3 players. OLED is currently mainly used in car-type displays, mobile phones, game consoles, portable small computers, and personal digital assistants (PDA). , Car audio and digital cameras, etc. The future will be towards the development of materials with high fluorescence efficiency.