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Difference of AMOLED AND OLED
Aug 09, 2018

OLED (Organic Light Emitting Diode) organic light emitting diode (device), AMOLED (Active Matrix/Organic Light Emitting Diode) active matrix organic light emitting diode (device) is called next-generation display technology, including Samsung Electronics, Samsung SDI, LG, Philips Both attach great importance to this new display technology.


Although LEDs are more common in everyday life, in the screen, each LED is very small in size and is divided into three sub-pixel groups of red, green and blue, and then different colors are formed, and the sub-pixels are arranged. The way will also affect the entire display. The O in AMOLED stands for Organic, which is "organic". Simply put, a series of organic thin film materials are used between the positive and negative electrodes to achieve the purpose of illuminating.

AM stands for Active Matrix and is relative to the Passive Matrix. It refers to the driving method of each OLED pixel. In the Passive Matrix, the control of each pixel is realized by a complex electrode network to achieve charge and discharge of a certain pixel. In general, the Passive Matrix is controlled at a relatively slow speed and has a slightly lower control precision. Unlike the Passive Matrix, the Active Matrix has a TFT and capacitor layer on each LED so that when a row is energized to activate the intersecting pixel, the capacitor layer in the pixel can be refreshed between refreshes. Maintain a state of charge for faster and more accurate pixel illumination control.


Organic Light-Emitting Diode (OLED) is also known as organic electro-laser display (OLED). It is a different type of illumination principle than liquid crystal display (LCD). OLED was discovered by the Chinese-American professor Ching W. Tang in the laboratory in 1983, and the research on OLED was carried out. OLED display technology has the advantages of self-illumination, wide viewing angle, almost infinite contrast, low power consumption, and extremely high reaction speed. The main advantage of OLED screens is the high degree of controllability of the pixels, each pixel can be independently switched to achieve purer black and higher contrast. In addition, turning off unnecessary pixels while displaying a picture can also reduce power consumption. At the same time, since the number of layers inside the screen module is small, the light transmittance is also better, which is advantageous for achieving higher brightness and a wider viewing angle.

OLED screens can be made very thin, making them ideal for mobile devices like mobile phones. In addition, due to the lack of a hard backlight layer and the maturity of flexible plastic substrates, OLEDs also have great advantages on flexible screens, creating more possibilities for future mobile devices and even wearable devices.

The difference between the two

AMOLED belongs to OLED, but the reverse is not the case. Simply put, OLED technology includes PMOLED and AMOLED. PMOLED does not require TFT backplane (different from liquid crystal backplane), but the size cannot be made very large; AMOLED size can be made very large. PMOLED is mainly used in early dual-screen mobile phones for small external screens. Currently, mobile TVs use AMOLED technology.

OLED is an organic light-emitting diode whose luminescent material is an organic luminescent material, which is relative to an LED light-emitting diode. As long as the OLED is applied with the correct voltage at the positive and negative poles, it will illuminate, and the light bulb is the same. When it is signaled, he will work.

AMOLED is an active organic light-emitting diode. It not only needs to add signal, but also needs to supply additional point source to make the diode work. When it gives a bright or no light signal, it will light or shut down. It's not an inappropriate analogy. It works like a TV set. You pick it up with a wired signal, but you can't see it. You only have to pay for it. But only give electricity, do not give wired signals, and there is no program to watch.

From a structural point of view, the OLED is basically a diode, and the AMOLED is a three-stage tube or a plurality of transistors to jointly drive one light-emitting point.

OLED also has PMOLED "passive array organic light emitting diode panel". One is active lighting control and the other is passive lighting control. Our mobile phone generally refers to AMOLED. The so-called OLED is to apply a layer of conductive organic materials on the glass substrate of the screen (this material is very expensive), then AMOLED is added to the OLED panel with AM technology, active control.

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