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Talking about the display principle of OLED display technology

With the continuous development of science and technology, the display technology of flat-panel TVs is also constantly improving and following the trend. Experts predict that in the near future, OLED panels will replace LED panels and become the new darling of flat-panel TVs. Compared with CCFL, LED has great advantages in picture performance. So, what are the advantages of OLED? Today, we will briefly talk about the display principle of OLED display technology.

OLED display technology is different from traditional LCD display methods. It does not require a backlight. It uses a very thin coating of organic materials and a glass substrate. When an electric current passes, these organic materials will emit light. Moreover, the OLED display screen can be made lighter and thinner, with a larger viewing angle, and can significantly save power.

The basic structure of an OLED is a thin and transparent indium tin oxide (ITO) with semiconductor characteristics, which is connected to the positive electrode of electricity, plus another metal cathode, wrapped into a sandwich-like structure. The entire structure layer includes a hole transport layer (HTL), a light emitting layer (EL), and an electron transport layer (ETL). When the power is supplied to an appropriate voltage, the positive electrode holes and the negative electrode charges are combined in the light-emitting layer to produce light, and the three primary colors of red, green, and blue RGB are formed according to different formulas, which constitute a basic color. The characteristics of OLED is that it emits light by itself, unlike TFTLCD, which requires a backlight, so visibility and brightness are high, followed by low voltage requirements and high power saving efficiency, coupled with fast response, light weight, thin thickness, simple structure, low cost, etc Is considered one of the most promising products in the 21st century.

In order to illustrate the structure of the OLED, each OLED unit can be compared to a hamburger, and the light-emitting material is a vegetable sandwiched in between. Each OLED display unit can produce three different colors of light in a controlled manner. OLEDs, like LCDs, have active and passive distinctions. The cells selected by the row and column addresses are illuminated in passive mode. In the active mode, there is a thin film transistor (TFT) behind the OLED unit, and the light emitting unit is lit by the TFT drive. Passive OLEDs are more power efficient, but active OLED displays have 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 not distorted even when viewed at a large viewing angle; The display time is fast, and there is no tailing phenomenon; the low temperature characteristics are good, and normal display can still be performed at minus 40 degrees; the manufacturing process is simple, 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 take the lead in the future display field.


Post time: Mar-04-2020