OLED is a flat panel display technology that has been developed for TV, computer monitors, smart phones, and tablets. OLED stands for Organic Light Emitting Diode and it produces light by passing an electric current through a thin layer of organic material. This results in a high contrast ratio, wide viewing angles and very low power consumption compared to other display technologies like LCD or Plasma.

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What is an OLED?

OLEDs are thin, light and flexible. They are made of organic layers. The materials used in OLEDs allow them to be transparent or opaque, depending on how the device is built. Unlike other displays, OLEDs do not require any backlighting because they produce their own light when an electric current is applied through them.

This material emits the color itself instead of relying on backlight technology found in LCD displays. So not only does this process result in better contrast ratios than traditional screens like LCDs but it also results in a more energy efficient screen.

PMOLED & AMOLED

PMOLED and AMOLED are two types of OLED displays. PMOLED stands for “passive matrix organic light emitting diode”, meaning that it's a passive matrix display with an organic material layer. This is the type of display used by most older digital watches (such as Citizen VIRT). AMOLED stands for “active matrix organic light emitting diode”, which means that there is an active electronics layer sandwiched between two OLED layers (one per pixel). This type of display requires less power than PMOLED, making them more efficient overall.

AMOLEDs also have better color reproduction than their PMOLED counterparts because they can be tuned to achieve different colors at each pixel rather than offering just black and white like the older technology allows.

Advantages & Disadvantages of OLED

Advantages:

·       OLEDs are very thin and lightweight, which makes them ideal for use in portable devices.

·       Because OLEDs use less power than LCDs do—which means less heat generation as well—OLED displays can be thinner without sacrificing performance or battery life.

·       OLEDs have better viewing angles and contrast ratios than LCDs do, they're closer in performance to CRT monitors when it comes to color accuracy at various angles in front of you.

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·       OLED has a very wide operating temperature which can go -40~80°C. Typically for LCDs such as TFT, we have -30°C, in some exceptional cases we have -40°C.

Disadvantages:

·       The lifespan of an OLED panel is significantly shorter than that of a traditional TFT LCD panel. This may be due to the individual organic materials used in each pixel being less stable over time than their inorganic counterparts (e.g., silicon).

·       High temperatures decrease OLED lifetime. If OLED needs to work constantly in a high temperature, like 50, 60 or 80 degrees, better to check how it will affect the lifetime.

·       OLEDs are more expensive than the LCDs, especially AMOLED.

Applications of OLED

OLEDs are suitable for almost all applications, small ones like portable devices such as watches, phones, and laptops; bigger ones like TVs, computer monitors and digital billboards. The main drawback of OLEDs is that they are easily damaged by exposure to moisture and oxygen. If you plan to use an OLED in a humid or wet environment, you will need to protect it with a barrier against these elements or consider other types of displays.

Also, OLED has limited lifetime. This means that if you want the display to last for years, you need to find another display technology.

Conclusion

OLED is a good display technology, but there are some drawbacks. OLED displays have many advantages over traditional LCDs like higher contrast ratios and better viewing angles. However, they also have some disadvantages such as shorter lifetime and vulnerability to light. In addition, OLEDs are more expensive than LCDs so they may not be right for everyone's budget.

Difference Between AMOLE, PMOLED, OLED

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0.66inch pmoled vs 0.95 inch amoled

Both PMOLED and AMOLED belong to OLED

The OLED display is characterized by self-luminescence, high contrast, low power consumption, lightweight, thin thickness, etc. It is called the next generation of display technology. According to the drive mode, OLED can be divided into active drive (AMOLED) and passive drive (PMOLED). So what are the differences between PMOLED and AMOLED? 

1. What do AMOLED and PMOLED stand for?

AMOLED stands for Active-matrix Organic Light Emitting Diode.
PMOLED stands for Passive matrix Organic Light Emitting Diode.

2. Difference between AMOLED and PMOLED in driving mode

When the external current turn off, the arrangement of the liquid crystal will change. 
AMOLED
After the electric current turn off, if the liquid crystal arrangement keeps the same, it`s called active.
PMOLED
Once the electric current disappears, the liquid crystal is recharged to arrange, it`s called passive.

3. Comparison of the advantages and disadvantages of AMOLED and PMOLED

3.1. Advantages and disadvantages of AMOLED

AMOLED is an independent thin film electric crystal to control each pixel, each pixel can continuously and independently drive light-emitting, and it can be driven by low-temperature polysilicon or oxide TFT, with the advantages of low drive voltage and long life of light-emitting elements. But the high cost and the production process are more complex, and the cost is much higher than PMOLED.
The AMOLED is characterized by a fast reaction speed, Available for large-size TV panels, The disadvantage is that its cost is too high.
 

3.2. Advantages and disadvantages of PMOLED

PMOLED simply forms a matrix of cathode and anode, Lighting up the pixels in the array by scanning, Each pixel is operated in a short-pulse mode, For instant high-brightness light-emitting, The advantage is that the simple structure, can effectively reduce manufacturing costs.
However, the drive voltage is high, Making PMOLED unsuitable for application in large sizes with high-resolution panels, PMOLED is not suitable for displaying dynamic images, Because the reaction speed is relatively slow, But it is very energy-efficient.

4. Differences between AMOLED, PMOLED, and OLED

Both  AMOLED and PMOLED belong to OLED. PMOLED does not need a backlight, but the size can not be large; AMOLED size can be large. The PMOLED was mainly used on early two-screen phones for small external screens and current mobile use AMOLED technology.



AMOLED is an active organic light-emitting secondary tube, which requires not only a signal, but also an additional power supply to make the secondary tube work, and then gives a bright or not bright signal, and it will light up or turn off. It works like a TV, if you give it a wired signal, but you can't watch it, only with electricity. But only give the electricity, do not give the cable signal, and there is no show to watch. Structurally, the OLED is basically a secondary tube, and the AMOLED is a tertiary tube or multiple triodes working together to drive a luminous point.

PMOLED represents the passive matrix OLED, which is related to the way it controls (or drives) the display. The PMOLED display is a simple control scheme, in which you control each row in the display in turn. PMOLED electronics do not contain storage capacitors, so the pixels in each line are turned off in most cases, and to compensate for this, you need to use more voltage to make them brighter.

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