What is the difference between PMOLED and AMOLED?

April 17, 2023
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According to the driving method, OLED displays technology can be divided into the passive matrix (PM-OLED) and active matrix (AM-OLED).

 

Passive matrix (PM-OLED)

 

It refers to the arrangement of the driving electrodes in the OLED display.

 

In PMOLED displays, there is an array of horizontal conductors and an array of vertical conductors, with the OLED material between them.

 

Its pixel is formed where the vertical and horizontal conductors intersect.

 

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Figure 1. Structure of PMOLED

 

Advantages of PM-OLED

  • High contrast displays with cool crisp icons.
  • Ultra-thin design as there is no backlight.
  • Low power consumption.
  • Wide viewing angles.

Disadvantages of PM-OLED

  • To maintain the brightness of the entire panel, it is necessary to increase the brightness of each pixel to increase the operating current, so the lifespan is shortened.
  • It is not suitable for large-size panels.

 

Active matrix (AM-OLED)

 

AMOLED stands for active matrix organic light emitting diode. It employs an active matrix in addressing pixels and uses a specific type of thin film technology in which organic compounds form electroluminescent material.

It is a display technology used in mobile devices, digital cameras, media players, and televisions.

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Figure 2. Structure of AMOLED

 

 

Advantages of AM-OLED

 

  • Each pixel can be driven continuously and independently.
  • It can memorize the driving signal without operating under a high pulse current.
  • Higher efficiency and longer lifespan.
  • Suitable for large-size, high-resolution full-color OLED display products.


Disadvantages of AM-OLED

  • The production process is complex and expensive.
  • Immature technology development.

 

The picture below compares some parameters of AMOLED and PM-OLED for your better choice.

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Figure 3. AMOLED vs. PMOLED