LG’s new four-stack OLED could be a game changer for TVs — here’s why

What even is a four-stack OLED panel?
As the name implies, LG's four-stack engineering leverages multiple OLED emitting layers held within its white-OLED panels (WOLED). Although the word "tandem" is used in Panasonic's branding of the technology, this isn't to be confused with Apple's Tandem OLED, which, though similar, is a different structure of RGB layers (side by side). Stacking OLED layers isn't a new concept, as even LG's 2024 TV lineup featured a three-stack structure, with its flagships aided with micro lenses (MLA).

Instead of using MLA panels, which are notoriously expensive to produce, LG is adding another OLED layer to its panel structure, thus bringing it to four, and also tossing in more deuterium hosts, according to Ross Young, CEO of Display Supply Chain Consultants. Not to turn this into a full-blown chemistry lesson, but in simplest terms, deuterium is an organic material that has been found to make OLED TVs much brighter.

According to The Elec, LG Display has stacked, from the bottom, blue, green, blue and red (B-G-B-R) layers as opposed to the three-stack WOLED's blue, green/yellow green/red, and blue (B-GYG-R) layers. This could not only lead to better brightness, but also a far wider range in colors and potentially even better color accuracy on these newer OLED sets.