Presumably everyone has a certain understanding of OLED display, so for the structure and working principle of OLED display, it is estimated that everyone is confused, today Tuowei OLED display manufacturers will tell you about the structure and working principle of OLED display.
1 Structure of OLED
OLED consists of the following parts:
Base layer - the base layer is used to support the entire OLED.
Anode – The anode eliminates electrons as current flows through the device.
Organic layer - The organic layer is composed of organic molecules or organic polymers.
Conductive layer – This layer is made up of organoplastic molecules that transport "holes" from the anode. Polyaniline can be used as a conductive polymer for OLEDs.
Emission layer – this layer is made up of organoplastic molecules that transport electrons from the cathode; The luminescence process takes place at this level. Polyfluorene can be used as an emitting layer polymer.
Cathode – When current is flowing inside the device, the cathode injects electrons into the circuit.
2 Manufacture of OLEDs
The most important part of the OLED production process is to apply the organic layer to the base layer. There are three ways to get this done:
2.1 Vacuum deposition or vacuum thermal evaporation
The organic molecules located in the vacuum chamber are slightly heated, and then these molecules condense in the form of a thin film on a cooler base layer. This method is costly but less efficient.
2.2 Organic vapor deposition
In a low-pressure hot-wall reaction chamber, the carrier gas transports the evaporated organic molecules to the low-temperature substrate, where they then condense into a thin film. The use of carrier gas can improve efficiency and reduce the cost of OLEDs.
2.3 Inkjet printing
Inkjet technology allows OLEDs to be sprayed onto the base layer as ink is sprayed onto paper during printing. Inkjet technology greatly reduces the production cost of OLEDs, and can also print OLEDs onto films with very large surface areas to produce large displays, such as 80-inch large-screen TVs or electronic signage.