Definition | OLED – OLED – Organic Light -Emitting Diode – Organic electroluminescent diode, what the OLED? Definition of OLED, advantages and myths | Swiss LG


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OLED: What is it ?

With OLED technology, screens can be flexible. © Gordon Bussiek, Fotolia

Oled is the acronym of Organic Light-Emitting Diodes (in French, organic lighting diode). An organic film (carbon compound) is sandwiched between two other films playing the role of electrodes electrodes . When a current is applied, the organic compound lights up. The advantages of technology are multiple: the screens are more shiny, more contrasting, thinner and lighter than LCD screens LCD, while requiring much less energy energy and potentially less expensive in production.

If OLED screens are finer, it is because they do not require a backlight device. Indeed, with OLED technology, each pixel pixel turns into a light light source . In fact, contrasts are often more marked. Black is simply reflected in the extinction of pixels – impossible with an LCD screen with permanent backlight. Thus, when applied to smartphones, technology contributes to optimizing the battery cycle since on black areas the luminescence of the screen will not be active.

The advantages of OLED technology

OLED technology is also distinguished by offering better viewing angles and a lower darkening rate on viewing at more than 45 °. Note also a response time of less than 0.1 ms with much less persistence persistence than on an LCD screen (2 ms). In practice, this speed will result in a very clear image.

With OLED technology, new designs and concepts were born. The removal of liquid crystals from LCD screens makes it possible to design flexible, or even transparent screens . Several manufacturers have thus developed televisions or curved smartphones. It is a question of offering a slightly more advanced immersion to reading video content.

The drawbacks of OLED technology

“An OLED TV screen in store” © “Samsungs Gebogener Fernseher – IFA 2013” by Sebastian Wochnik

Despite these advantages, OLED technology still presents some disadvantages. On the one hand, the lifespan lifespan is more limited. Initially, the red, green and blue subpixels lost their intensities after a few thousand hours. This is the main reason why some manufacturers have abandoned technology. However, some improvements have increased the cycle of OLED screens. Today, we are talking about around 100.000 hours.

In addition to questions relating to technological patents filed slowing down the massive adoption of OLED screens, it should also be noted that manufacturing requires a highly mastered environment since organic semiconductors are particularly sensitive to humidity.

OLED technology is what ?

Recent technology used on more and more screens, OLED is the acronym of organic light-emitting diode, which means in French organic electroluminescent diode. This technology has many advantages, including that of not using backlight (unlike LED LED screens), allowing energy saving and deeper blacks.

OLED dates from the late 1980s and was used commercially ten years later, but it was not until 2007 to see on the market the first OLED TV. Today, OLED technology is one of the most used for screens, whether they are large televisions, smartphones, displays, lighting panels or any other type of screens. It remains a technology of the future, with in particular the advent of flexible and transparent OLED screens.

An OLED screen, how it works ?

An OLED screen operates on the principle of electruminescencement electruminescence . It is made up of one or more (often 2) organic layers composed of semiconductive molecules molecules and located between the anode anode and the cathode cathode .
When an electrical voltage is applied, the negative electron electrons of the cathode and the positive anode electron holes combine in the emission layer emission of the organic layer to form exciton excitons .

The disintegration of this excited state excited is a relaxation of electronic energy levels, accompanied by the issue of a radiation whose frequency is in the visible area. The choice of materials used is essential for optimal operation.

They must make it possible to promote the transport of electrons and holes. The anode is generally manufactured in Indium Indium and tin oxide oxide . The cathode can be made of barium or calcium calcium barium covered with aluminum aluminum .
There are several ways to make the organic layer. Most OLED screens are made by vacuum evaporation, a relatively simple, but not very effective method.

Some OLED materials are soluble and can be deposited using printing methods, such as inkjet printing, an effective and inexpensive method which could be the best means of construction of OLED screens.
There are 2 types of OLED technology: AMOLED (AM for active matrix), more efficient and PMOLED (passive matrix), easier and cheaper to produce. Their operating principles remain identical.

What are the advantages of the OLED ?

Today, OLED technology offers image quality never reached before. The advantages of an OLED screen are numerous:

  • END;
  • light;
  • flexible;
  • deep blacks;
  • an unequaled contrast;
  • excellent viewing angles;
  • an ultra-fast response time;
  • a lower manufacturing cost than LCD or plasma screens;
  • Energy consumption of relatively low energy consumption.

The only real weak point of the OLED is its correct level of brightness, but lower than a QLED screen (the OLED is perfect in a dark environment). The construction of OLED screens is also delicate, being particularly sensitive to oxygen and mold. Today only QLED and micro-LED technologies can possibly compete in terms of quality with the OLED.



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What is the OLED? – Definition of OLED, advantages and myths

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  • In recent years, televisions have quickly evolved. OLED technology is no longer a future dream. Indeed, you can today buy your own OLED TV. To help you make this decision, we have prepared a quick guide which explains what exactly the OLED technology consists of, why is its use in our televisions so revolutionary and what are the advantages of OLED TV.

What is an OLED TV?

  • There are two types of OLED technology: passive-matrix (PMOLED) and Active-Matrix (AMOLED). Active-Matrix technology requires electronic components to turn on and extinguish each pixel individually. This technology is much better for the display of deep blacks, and that is why it is used in OLED televisions that we can buy today.
  • An OLED panel is generally made up of four main layers:
    • the substrate, which serves as a structural framework
    • the anode, which attracts electrons
    • Cathode, which provides electrons
    • and the organic layer between these layers
    • This organic layer is then divided into:
      • A conductive layer, which provides the “electron holes” in which the electrons crossing the layer can engage, thus clearing energy
      • and an emissive layer in which light is really produced.
      • So, if you want to start playing with the production of real colors, just add layers of red, green and blue plastic to the substrate.

      Advantages of the OLED

      Low energy consumption

      Best image quality

      Response time and shift

      Perfect vision angle

      Lightweight and innovative design

      Myths linked to OLED technology

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