What is AMOLED display

AMOLED ( active-matrix organic light-emitting diode )In AMOLED display current to each individual pixel is controlled by a thin-film transistor ( TFT ) which is called the active matrix ( AM ) and each individual pixel is made up of organic light-emitting diode ( OLED ). Thus each individual pixel in AMOLED display is independently controlled and operated. 
Super AMOLED is an AMOLED display that has an integrated touch function: Instead of having a layer that recognizes touch on the top of the screen, the layer is integrated into the screen itself.

An AMOLED display consists of an active matrix of OLED pixels generating light (luminescence) upon electrical activation that have been deposited or integrated onto a thin-film transistor (TFT) array, which functions as a series of switches to control the current flowing to each individual pixel.
Typically, this continuous current flow is controlled by at least two TFTs at each pixel (to trigger the luminescence), with one TFT to start and stop the charging of a storage capacitor and the second to provide a voltage source at the level needed to create a constant current to the pixel, thereby eliminating the need for the very high currents required for passive-matrix OLED operation.

Advantages of AMOLED display

  •  Energy efficiency: Lower power consumption when compared against other display technologies such as LED and LCD is one of the advantages of AMOLED. Note that each diode in an AMOLED panel emits light without generating too much heat. Thus, unlike LED and LCD, energy loss due to heat transfer is lesser in this display technology. Furthermore, because each diode or pixel generates light itself, an AMOLED panel does not require backlighting for colors and images to become visible unlike in LCD. Remember that backlighting requires drawing additional power from an energy source. Power consumption is also relatively uneven in this display technology, focusing mostly on active pixels as represented by visible colors. Darker colors consume less power. On the other hand, blacks do not consume power because they are actually representing inactive pixels.

  • Thinness: A conventional AMOLED panel has an organic plastic layer with thinness of about 100 to 500 nanometers. This is about 200 times thinner than the strand of human hair. This thinness also translates to lightness and flexibility. To be specific, the organic plastic layer of AMOLED is thinner, lighter, and more flexible than the rigid crystalline layers of the LCD display. More light passes through because of this thinness, thus producing a brighter luminescence than a typical LED. Nonetheless, this advantage leads to the design and development of innovative form factors. Using an AMOLED panel allows manufacturers to produce devices that are thinner. Several manufacturers have introduced curved displays and novel displays that are not only ultra-thin but can also be rolled or folded

  • High contrast ratio: High contrast ratio or the difference between the brightest whites and the darkest blacks is another advantage of AMOLED. This advantage is very evident when compared against other LCD display technologies such as in-plane switching or IPS and twisted nematic technologies. A typical AMOLED has a higher artificial contrast ratio because each of its diodes or pixel of organic material emits lights and produces color. Its deep blacks are also incomparable with other display technologies. These blacks are not artificially produced unlike in LCD because they are essentially a product of the absence of light.

  • Overall display quality: With deep blacks coupled with high contrast, the images displayed on an AMOLED panel are brighter and more vivid than the images displayed on typical IPS and TN panels. This display technology also has a better viewing angle than high-end IPS panels. There are no noticeable color shifts and brightness and vibrancy remain unchanged even when viewed from extreme angles.AMOLED panels also have better response time and refresh rates than conventional IPS panels. This means that moving images are more fluid and less straining to the eyes.

Source -https://www.profolus.com/topics/advantages-disadvantages-amoled