What is PM-OLED (Graphic OLED Display) ? 

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PM-OLED stands for Passive Matrix OLED (or, in full, Passive Matrix Organic Light Emitting Diodes). Passive Matrix refers to the arrangement of the driving electrodes in the OLED display.
If an OLED display is compared to an LCD display, PM-OLED is more like STN LCD, whereas AM-OLED is like TFT LCD. PM-OLED displays are not suitable for displaying dynamic images as the reaction speed is relatively slow and it is difficult to develop large-size panels, but their power consumption is relatively low. AM-OLED displays, by contrast, have a fast reaction speed and can come in a variety of sizes – including larger displays – but they involve higher power consumption.

The structure of PM-OLED displays is relatively simple, with the driving current method determining the grayscale, resolution, and picture quality performance. Most PM-OLED displays are monochrome (Graphic Display) or multi-color products. The nature of the drive method means that the resolution of PM-OLED displays cannot be improved, meaning their use is limited to small-scale devices with a maximum size of about 5 inches.
PM-OLED does, however, have a number of advantages. For starters, they are cheaper and have very low power consumption. The nature of the displays also mean they can display pure black and can offer no glare (meaning they are readable in direct sunlight) and high brightness. They are also easy to drive as most PM-OLEDs have  I2C, SPI interface.
The PM-OLED displays that Panox Display supplies can be used in 4G-LTE, handheld, kid watches, instruments, car displays, smart homes, and electronic cigarettes.

What is AM-OLED Display（Full-Color OLED）?

AM-OLED stands for Active Matrix OLED (or, in full, Active Matrix Organic Light Emitting Diodes). Compared to traditional TFT screens, AM-OLED screens offer a number of advantages, including faster response speeds, self-illumination, excellent display effects, and lower power consumption. 
These advantages mean OLED displays are able to display pure black, offer higher contrasts, deliver more vivid colors, and can be used in direct sunlight, all while using relatively little power. Taken together, this explains why AMOLED displays are so well suited for use in handheld, military equipment, gaming, and sports-related devices.

It need big investment to produce AMOLED, there are less than 20 companies can produce AMOLED all over the world, the major manufacturers of AMOLED contains Samsung, BOE, EDO, GVO(Visionox), Tianma, Innolux, AUO, Truly, etc.

Structure of AM-OLED Display

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Substrate layer: The bottom layer is made of glass or plastic and acts as a base for the entire AMOLED structure.
Anode layer: The anode layer is made up of a transparent electrode material such as indium tin oxide (ITO) that is coated on the substrate layer. It helps in providing an electric charge to the OLED material.
Organic layer: The organic layer consists of a thin layer of organic materials that are responsible for emitting light when an electric charge is applied. It is made up of various sub-layers, including a hole injection layer, a hole transport layer, an emissive layer, and an electron transport layer.
Cathode layer: The cathode layer is made up of another transparent electrode material such as aluminum or silver that is deposited on top of the organic layer. It helps in extracting electrons from the OLED material.
Thin-film transistor (TFT) layer: The TFT layer is a layer of transistors that are responsible for controlling the flow of current to the OLED material. It is located behind the organic layer and is used to individually address each pixel in the display.

Advantages of AM-OLED Display

Wide Operation Temperature Range