3 Common Types of Organic Light-Emitting Diodes (OLEDs)

Dec 6, 2021

When researching display technologies, you may come across organic light-emitting diode (OLED). Not to be confused with LED-backlit liquid crystal display (LCD), OLED is a classification of display technologies that feature self-illuminating pixels. You can find monitors, tablets, TVs and other display devices that use OLED technology.

OLEDs are distinguished by their use of self-illuminating pixels. LCDs don’t have self-illuminating pixels. They still have pixels, but LCDs require backlighting for illumination. While all OLEDs have self-illuminating pixels, though, there are several different types of OLEDs

#1) Transparent

Transparent OLEDs are commonly used for commercial displays. They live up to their namesake by consisting of transparent contacts. Transparent OLEDs are designed with one or more layers of transparent material on the sides. These transparent contacts improve contrast and promote a wider viewing angle.

With transparent contacts on the side, you can see transparent OLEDs from a wider angle. The transparent contacts promote a wider viewing angle, which is one of the main benefits of transparent OLEDs.

#2) Stacked

In addition to transparent, there are stacked OLEDs. Stacked OLEDs feature pixels that are essentially stacked on top of each other. Other types of OLEDs feature unstacked pixels. The red, green and blue pixels are placed next to each other. They are still placed on different layers, but other types of OLEDs use unstacked pixels that are placed next to each other.

Stacked OLEDs use a different pixel design. The red, green and blue pixels are stacked on top of each other. The end result is better gamut and color depth when compared to other types of OLEDs.

#3) Inverted

Some OLEDs use inverted technology. Inverted OLEDs feature a bottom cathode that’s joined to the end of a TFT. Most OLEDs, of course, feature an anode on a substrate. Inverted OLEDs use a different design that includes an n-channel transistor.

Inverted OLEDs are typically more energy efficient than both transparent and stacked OLEDs. They consume less power during use, resulting in cost-savings benefits. Inverted OLEDs also cost less than most other types of OLEDs. With that said, they have a narrower viewing angle than transparent OLEDs and less color depth than stacked OLEDs.

In Conclusion

You shouldn’t assume that all OLEDs are the same. There are different types of OLEDs, some of which include transparent, stacked and inverted. Transparent OLEDs feature transparent contacts on the side. Stacked OLEDs, on the other hand, feature stacked pixels. Finally, inverted OLEDs feature an n-channel transistor.

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