The AMOLED screen has three layers, an AMOLED screen, a TouchScreenPanel (a touch panel) and a protective glass.
The working principle of
AMOLED is based on organic luminophor, tens of thousands of only have red, green or blue all three color of a light source is placed on the screen in the form of a specific substrate, these lights on the applied voltage can emit red, green or blue, voltage transformation also need to rely on TFT, after adjusting the proportion of primary colors, to give them all sorts of color
Compared with the traditional TFT screen, AMOLED displays black, thick black, while TFT is more like dark gray; The white of AMOLED is also pure white, so as to achieve more transparent display effect
AMOLED displays are thinner than LCD screens. The LCD screen contains backlight, color filters, backlight modules and liquid crystal materials, and because of its self-luminescence principle, AMOLED doesn't require these parts. Integrated touch technology also makes AMOLED displays thinner and lighter. The world's first AMOLED touch screen was launched in 2010 and has been used on high-end smartphones
AMOLED display outdoor readability
It's not impossible to see maps and addresses in your phone in bright light. Outdoor readability is proportional to the color X brightness, while OLED has 1.7 times the color of the LCD. AMOLED display has good outdoor readability, which can be clearly rendered in bright sunlight, providing a better perspective for outdoor reading. 
AMOLED displays have lower energy consumption
AMOLED displays can consume significantly less energy than traditional LCD screens because of the AMOLED display
A pixel can be controlled independently without constant backlighting. When browsing the white web pages such as baidu, most of the pixels need to be 100% polished. On the other hand, when the scene is dark video, the pixel will reduce the glow. In this case, the emission brightness of the LCD screen is 100%, and the local brightness is controlled by controlling the rotation direction of the liquid crystal molecules. Each pixel of the AMOLED display can regulate its brightness independently, which means that it does not require 100% brightness emission to save energy consumption. Even watching video or appreciating multimedia doesn't make a lot of time for battery use. In an emergency, the power consumption model is reduced to 10 percent to avoid unnecessary pixel energy consumption, and the phone can be used for up to 24 hours.
AMOLED screens are very thin and can be integrated into the touch layer on the screen to make it more advantageous.
High resolution AMOLED pentile arrangement, not as a traditional LCD pixels is equal to the red, green, blue three subpixel collection, but a pixel green 0.5 = 1 (blue and red), sharp emphasize green, make the picture looks more lustrous.
AMOLED spontaneous light, single pixel display black current not working, show dark low power consumption. So AMOLED saves power in the dark, and has the contrast of a few hundred times the traditional LCD, and it doesn't leak.
AMOLED has a certain flexibility that is less damaging than the LCD screen of a glass substrate.
AMOLED and SUPER AMOLED have a very wide range of colors