AMOLED

AM-OLED means Active matrix organic light emitting diode; an OLED Display is a series of organic thin films between two conductors. If electric current is applied in a pixel, light is emitted.

Every single pixel will be activated (electrical) via a Thin Film Transistor TFT array. To start the luminescence of one pixel the manufacturer uses two TFTs. There are two Thin Film backplane technologies:

  • Polycrystalline Silicon (poly-Si)
  • Amorphous Silicon (a-Si)

Both of these TFT technologies have the advantage that they can produce the backplanes at a temperature under 160 Celsius. This means that flexible displays on plastic substrates are now also a practical possibility.

One of the key points to note is that an Organic light emitting diode does not have to be a backlight like LCD. The OLED manufacturer can use a glass, for example, Corning Gorilla Glas as in the Galaxy S series, a plastic like LG Flex, or a metal foil. The kind of display that can thus be produced is very thin and efficient, flexible and transparent.

What kind of products can be produced with OLED?

Diagram of an OLED display:

Check out our graphic to see the detail of an organic panel.

  • Anode
  • Hole Injection Layer (HIL)
  • Hole Transport Layer (HTL)
  • Emissive Layer (EML)
  • Electron Transport Layer (ETL)
  • Cathode
  • Thin Film Encapsulation Barrier (plastic)
  • Glass, Plastic, metal foil Substrate

detail schematic of oled display AMOLED

Advantages over LCD-Displays

  • Contrast ratio Because of no backlight black is real black 1.000.000:1
  • Real True colours It has a high color gamut, and so there is no color distortion when you see it from different angles
  • Fast Response 1000x faster than LCD
  • True wide field of view There are no changes in the picture quality from any angle and so you get a truly wide field of view.
  • High Perceived Luminance Luminance It makes you feel that it is brighter than the existing display at the same level of brightness.
  • Very thin displays It is thin and light because it is atomic emission element with simple structure
  • flexible Displays on plastic or metal foil
  • Transparent Displays

LCD vs AMOLED


Different AMOLED Displays from Samsung Display

Samsung Display has the world largest AMOLED & flexible IP portfolio with a 90 percent market share.

Super AMOLED


Super Amoled means that the layer for the touch system is integrated into the display. The pixel structure is a Pentile structure. This structure has a bigger blue pixel. At the PenTile structure two Pixel has four subpixel. True RGB has every pixel red, green, blue!
super amoled pixel structur AMOLED

Super AMOLED Advanced

This brand is from Motorola and is the same as Super Amoled but with a greater luminance and a higher resolution.

Super AMOLED Plus

The Plus Display has also an intergraded touch layer but the pixel arrangement is without PenTile. Thus this display has a standard RGB (3 subpixel) arrangement like regular LCD displays.
But why did Samsung Display change the arrangement?
With this pixel sectioning the displays are sharper, with a less grainy image.
Another advantage is that the panel is brighter and it has a lower power consumption.
super amoled plus pixel structur AMOLED

HD Super AMOLED

The same but with >1280×720 HD Pixel resolution, it was first used in the Galaxy Note.
Yes also here with PenTile or not, Galaxy Nexus and S3 use with 2xsubpixels/pixel, instead of Note2 use a True RGB matrix

HD Super AMOLED Plus

A true pixel RGB matrix.

Full HD Super AMOLED

This panel has a new pixel arrangement called “Diamond Pixel” It has a FULL HD resolution with 1920×1080 441 ppi. This delivers the best color gamut with 97 percent of the Adobe RGB color space.
diamond pixel structur galaxy s5 AMOLEDdiamond pixel structur samsung display AMOLED

Outlook

oled outlook 2018 AMOLED

Samsung Display plans a 2560×1440 Pixel 560 ppi panel for the Galaxy S5 in 2014!

galaxy s5 560ppi amoled AMOLED

Future

Television

Samsung and LG-Display offer curved 55 inch panels with different technologies.
Sony, Panasonic, AUO are working on printed panels.
For more detail see: Curved organic Television details

Country
Company
Panel Size
Resolution
Curved
Production technology
Korea LG-Display 55 inch UHD YES Evaporation
LG-Display 77 inch UHD YES Evaporation
Japan Panasonic 55 inch UHD NO INKJET
Korea Samsung-Display 55 inch UHD YES FMM
China Haier 55 inch FHD NO Evaporation
Samsung explain how to produce a AMOLED