OLED oled module structure, principle

The basic OLED structure consists of a thin transparent indium tin oxide (ITO) having semiconductor characteristics, and the power of the positive electrode is connected, together with another metal on the cathode, the package into the structure such as sandwiches. The entire structure layer including: a hole transport layer (HTL), a light emitting layer (EL) with the electron transport layer (ETL). When the supply of electricity to the appropriate voltage, the positive hole and the cathode charge will be combined in the emitting layer to produce bright, according to their different formulas for generating red, green and blue RGB three primary colors, constituting a basic color. OLED characteristics of its own light, unlike backlit TFT LCD, high visibility and brightness, followed by low voltage requirements and high power efficiency, coupled with fast response, light weight, thin, simple structure, low cost etc., is considered to be one of the 21st century's most promising products.
Organic light-emitting diode light-emitting principle and inorganic light-emitting diode similar. Components are DC (Direct Current; DC) derived from the forward bias voltage plus energy will drive electronics (Electron) and hole (Hole) components injected by the cathode and anode, respectively, when the two met in the conduction , that the formation of the so-called electron - hole recombination (Electron-Hole Capture). When chemical molecules excited by the external energy, the electron spin (Electron Spin) and ground-state electron pairs, compared to the singlet state (singlet), they release the light of the so-called fluorescence (fluorescence); Conversely, if the excitation state electronic ground state electron spin and not parallel, then known as the triplet state (triplet), the light released by the so-called phosphorescence (Phosphorescence).
When the electronic state position by the excited state energy-order low energy level back to the steady state, its energy of each photon (Light Emission) or heat (Heat Dissipation) release, wherein the portion of the photons may be utilized as a display function; contingent organic fluorescent material at room temperature and can not be observed in the phosphorescence of the triplet state, only 25% of the theoretical limit of the luminous efficiency of PM-OLED element.
PM-OLED light-emitting principle is to use the material gradient, the energy released is converted into photons, so we can select the appropriate materials as light-emitting layer or dye-doped light-emitting layer in order to get what we need light color. In addition, the binding reaction of the general electron and hole within tens of nanoseconds (ns), PM-OLED response speed is very fast.
The typical structure of P.S.: PM-OLED's. Typical PM-OLED by a glass substrate, ITO (indium tin oxide; indium tin oxide) anode (anode), an organic light emitting layer (Emitting Material Layer) and the cathode (cathode), wherein the thin, transparent ITO anode match the sandwich camel and a metal cathode and the organic light emitting layer double-teamed in which emit light when the voltage is injected into the hole of the anode and the cathode to the electron (Electron) (Hole) In the combination of the organic light emitting layer, excited organic material.OLED Display Module
Currently, the light emitting efficiency is preferred, generally use a multilayer PM-OLED structure, in addition to the glass substrate, Yin Yang electrode and the organic light emitting layer needed to produce a hole injection layer (the Hole Inject layer; HIL), a hole transport layer ( Hole Transport Layer; HTL), the structure of the electron transport layer (Electron Transport Layer; ETL) and an electron injecting layer (the Electron Inject Layer; EIL), and between the transport layer and the electrode need to set up an insulating layer, thermal evaporation (Evaporate ) processing is relatively difficult to improve the production process is complicated.color lcd display module
As the organic materials and metals are quite sensitive to oxygen and water vapor production is completed, subject to the package protection treatment. PM-OLED required by several layers of an organic thin film, the the contingent an organic thin film layer thickness of approximately only 1,000 to 1,500 A ° (0.10 to 0.15 um), the total thickness of the entire display panel (Panel) in the package plus desiccant (Desiccant) of less than 200um (0.2 mm), thin advantage.