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OLED and LED What is the difference

May 11, 2017

You must see the frequent "LED" the term, it and OLED only although there is only one letter difference, but in fact the two describes a completely different things. We all know that the LCD panel is through the backlight light, through the refraction of liquid crystal molecules produce a variety of different colors, liquid crystal molecules themselves can not light, and LED is only refers to the backlight. While the OLED itself can light, so no backlight. LED is the use of metal materials, and OLED is the use of organic materials; OLED more advanced, it does not have light exposure will be able to self-luminous, better contrast, usually with the LED is to have a backlight to see things.

First, LED light principle and light-emitting materials:

Semiconductor materials have a very interesting feature, is the so-called carrier; carrier is divided into two categories: one for the electronic, with negative; the other for the hole, with positive electricity. LCD light principle is the use of two carriers in some conditions can be combined, the release of energy in the form of photons released and light. It will be different according to the material, electrons and holes occupied by the energy level is different, that is, the relative height of electrons and holes can be connected to determine the height of the two carriers combined with the level of energy, can produce a different energy Of the photon, which can control the LED emitted by the wavelength of light, that is, the spectrum or color.

The materials used for LEDs are based on 3A-5A compound semiconductors (such as GaP, GaAs, GaN, AlInGaP, etc.). And why it will be issued by different colors of light, you have to LED their own material may be, for example: red AlInGa (aluminum), green use GaP (gallium phosphide), blue light on the use ZnS (zinc sulfide) or GaInN (indium gallium nitride) ... and the like.


LED according to its luminous wavelength to distinguish, can be roughly divided into visible light and infrared light-emitting diodes. Its light-emitting principle is the use of electrons in the semiconductor and the hole combined, the release of energy in the form of photons released and light, and light-emitting diode materials used to 3A, 5A elements of the compound semiconductor-based, such as: GaAs, GaP, AlGaP, AlInGaP, etc., the light emission wavelength and brightness will vary depending on the material used.

Second, OLED - organic light-emitting diodes

At present, the materials used in light-emitting diodes are inorganic semiconductor materials, more difficult to apply to large areas and the need for high-resolution components (EX: screen), to solve these problems depends on the new organic semiconductor materials (including hydrocarbon Material), it is coated on the conductive glass, through the current, you can release a variety of different wavelengths of light.

1, OLED light principle

The principle of organic light and light-emitting diode light similar to the principle of the same use of material properties, the electronic hole in the light-emitting layer on the combination of electrons from the excited state back to the ground state, the excess energy in the form of waves released to achieve the function of light. So only OLED and PLED call. (OLED is a small molecule of organic electroluminescent diodes, and PLED is a polymer of organic electroluminescent diodes.

2, OLED structure 

The basic structure of the organic light-emitting diode as shown below, the same use of the characteristics of the material, the electronic hole in the light-emitting layer on the combination of electrons from the excited state back to the ground state, and the excess energy in the form of waves And thus the generation of light-emitting components having different wavelengths is achieved. OLED is the use of the two electrodes were injected between the electrons and holes, and the use of organic molecules to stimulate, and to achieve the function of light. The anode is ITO conductive glass film, vapor deposition, attached to the glass or transparent plastic substrate, the cathode contains Mg, Al, Li and other metals. Between the two electrodes is a number of organic thin film formed by the light-emitting area, including the hole injection area, hole transfer area, organic light-emitting layer and electron transport layer, in the actual production, consider different needs, and sometimes also contain other Different film.

3, OLED color way

At present, organic light-emitting diode technology to green light the most mature, blue and red still commercialization. Organic light-emitting diode display color is divided into monochrome, colorful and full color, colorful by a number of monochrome display area, each region is still monochrome; full color is red, green, blue three-color light repeat Composition, the more fine the size of the pixel, the higher the resolution. In the application of the display, full color is a necessary condition for market success.

4, OLED technology, what are the advantages?

OLED is the organic light-emitting diodes, also known as organic electroluminescence display because of the thin, power and other characteristics, so from 2003 onwards, this display device in the MP3 player has been widely used, and for the same digital products DC And mobile phones, previously only in a number of exhibitions on the use of OLED screen engineering samples, but also did not enter the practical application of the stage. But the OLED screen has a lot of LCD incomparable advantages, so it has been optimistic about the industry.

5, OLED applications

OLED current stage is mainly used in automotive displays, mobile phones, game consoles, palm portable small computers, personal digital assistants (PDA), car audio and digital cameras ... and so on. The future will be the development of high fluorescent efficiency materials, 5-inch full-color display production, the development of new applications in organic components, high-resolution full-color small-size display development, such as smart mobile phones.

In the current liquid crystal display technology, OLED has a variety of advantages such as ultra-thin, good seismic performance, large viewing angle, short response time, low temperature and good luminous efficiency. Need to note that, although the OLED has been gradually being well known, but now we do not see a large area of OLED products listed.

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