With the continuous development of science and technology, the display technology of flat-panel TVs is also constantly improving. Following the trend, relevant experts predict that in the near future, OLED panels will completely replace LED panels and become the new favorite of flat-panel TVs. Compared with CCFL, LED has great advantages in picture performance. So, what are the advantages of OLED? Today, let's briefly talk about the display principle of OLED display technology.
Unlike traditional LCD displays, OLED display technology does not require a backlight and uses a very thin coating of organic materials and glass substrates that emit light when an electric current flows through them. Moreover, OLED display screens can be made lighter and thinner, with larger viewing angles, and can significantly save power.
The basic structure of OLED is composed of a thin and transparent indium tin oxide (ITO) with semiconducting properties, which is connected to the positive electrode of electricity, plus another metal cathode, which is wrapped into a sandwich-like structure. The whole 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 holes and the negative charges will combine in the light-emitting layer to produce light, and the three primary colors of red, green and blue RGB will be generated according to their formulas, forming the basic colors. The characteristics of OLED is that it emits light by itself, unlike TFTLCD, which requires backlight, so the visibility and brightness are high, followed by low voltage demand and high power saving efficiency, plus fast response, light weight, thin thickness, simple structure, low cost, etc. , is regarded as one of the most promising products in the 21st century.
In order to visualize the OLED structure, each OLED unit can be compared to a hamburger, and the light-emitting material is the vegetable sandwiched in the middle. Each OLED display unit can controllably produce three different colors of light. OLED, like LCD, also has active and passive types. In passive mode, the cell selected by the row and column address is lit. In the active mode, there is a thin film transistor (TFT) behind the OLED unit, and the light-emitting unit is lit under the TFT drive. Passive OLED saves power, but active OLED displays better performance.
The advantage of OLED is that it is thin and light, and its thickness is only one-third of that of LCD; because it is a solid-state structure, it has better shock resistance and is not afraid of falling; the viewing angle is large, and the picture is still not distorted even when viewed at a large viewing angle; The display time is fast, and there will be no smearing phenomenon; the low temperature characteristics are good, and it can still display normally at minus 40 degrees; the manufacturing process is simple and the cost is low; the luminous rate is high, and it can be manufactured on substrates of different materials.
Although there are still many bottlenecks in the production of large-size panels, there is no doubt that OLED display technology will come out on top in the future display field.
