LG Display Announce a New 27″ 4K OLED Panel with RGB-Stripe Layout

OLED panel manufacturer, LG Display today announced some further details of one of their new panels which was teased a couple of days ago in a promotional video (along with other new updates). The newly announced OLED panel offers a 27″ screen size, with a 3840 x 2160 “4K” resolution and a 240Hz refresh rate. This is the first time they’ve produced a 27″ 4K panel, following on from Samsung Display’s competing QD-OLED panel released in 2025.

This LG Display panel also offers support for a “dual-mode” function which allows you to double the refresh rate to 480Hz, at a lower 1080p resolution. Most interesting of all is the switch to a true RGB-stripe sub-pixel layout, doing away with the white sub-pixel and helping to improve text clarity and reduce fringing.

True RGB stripe layout

The RGB stripe sub-pixel structure arranges the three primary colour subpixels — red, green, and blue — in a straight line, significantly reducing visual distortions such as colour bleeding and fringing, even at close viewing distances. This is a change from their earlier “WOLED” panels which had an added white sub-pixel which was used for boosting brightness. In the past the earlier WOLED panels were arranged in an RWBG layout, but this was later updated and improved somewhat to RGWB with some of their newer panels.

We’d already seen significant improvements in text clarity on competing QD-OLED panels of this size and resolution, and although the increased pixel density alone would likely have solved most lingering issues anyway, it’s great to see LG Display just shift to a true RGB-stripe layout with the new panel. This structure is “optimized for operating systems such as Windows and for font-rendering engines, ensuring excellent text readability and high colour accuracy”.

LG Display mention a pixel density of 160 PPI in the press release, although if the actual panel size remains the same as previous 27″ class monitor panels (at 26.5″), it would be more like 166 PPI in reality. Although OLED panels using the RGB stripe method existed before (e.g. the professional-focused monitors featuring panels from JOLED), their maximum refresh rate reached around 60Hz, making them unsuitable for use as gaming monitors.

High refresh rate

LG Display’s new panel is the first in the world to achieve a 240Hz refresh rate while maintaining an RGB stripe structure. It incorporates the company’s specialized Dynamic Frequency & Resolution (DFR) technology (“dual-mode”), allowing users to directly switch between high-resolution (UHD 240Hz) and high-refresh-rate (FHD 480Hz) modes.

They explain that as they “developed [their] new pattern optimized for monitor use, it applied various new technologies — such as increasing the aperture ratio, which is the proportion of the pixel area that emits light. As a result, it achieved the world first of implementing both an RGB stripe structure and a high refresh rate simultaneously.”

4th Gen Tandem OLED?

This new panel should be considered part of their 4th Gen technology as far as we can tell although information shared at the moment is not complete and somewhat confusing. We’re seeking further clarification from LG Display on this area.

We do know that the new 27″ 4K panel was mentioned in a recent promotional video which talked about their ‘Tandem WOLED’ and ‘Tandem OLED’ technologies, implying it should fall in to one of those categories. Traditionally it’s been easy to just refer to LG Display’s OLED monitor panels as “WOLED” but clearly that won’t be appropriate with these new RGB-stripe panels without the “W” element. Their accompanying press release explained that “Tandem WOLED applies to large-sized OLED TV and monitor panels, which are now distinguished from Tandem OLED for small- and medium-sized panels, including automotive, tablet, and laptop displays.“

If the new 27″ 4K panel is not a ‘Tandem WOLED’ panel, does that mean it’s the same as their ‘Tandem OLED’ panels used in laptops and smaller devices? LG Display explain that those panels incorporate dual stacked RGB layers, and it’s not clear if that’s what is used here for this new 27″ 4K panel. That’s used for smaller display panels and so it’s likely it is the same technology used here, but strangely there’s zero mention of “Tandem” in the press release which announces this new panel. This also has a potential impact on panel performance in other areas such as lifespan, brightness (discussed below) and black depth retention in the presence of ambient light.

We’re seeking clarification from LG Display on how this new panel is classified and its panel structure.

Panel brightness

Another thing that remains unclear at the moment is what impact removing the white sub-pixel and increasing the pixel density will have on brightness specs. Without the white sub-pixel boost we’d expect a drop in the brightness specs being advertised, it probably won’t reach the same 1500 nits peak that their most recent 4th Gen Tandem WOLED panels have reached. Whether or not it can meet the VESA DisplayHDR 500 True Black certification tier is also unknown at this time.

With only RGB sub-pixels now available, this will offer an “additive” approach to colour brightness, which should mean we get higher colour volume in HDR – i.e. colours will be maintained even at maximum brightness. This will behave differently to previous WOLED panels where the white pixel would be used to boost brightness, but this can lead to some washout of colours and “volumetric collapse” when considering colour volume for HDR for lower APL scenes.

More news at CES

No doubt there will be more news and information at CES in early January, and we will be visiting LG Display’s booth to get all the latest updates. They’ve already teased another new OLED panel, a 39″ ultrawide with a 5K2K resolution, so we hope to see that exhibited as well. Please keep in mind that this is an announcement about an OLED panel, not any specific display at this stage. It remains to be seen whether familiar monitor brands will adopt this new panel and when, but hopefully we’ll see some news and announcements at CES from the likes of Asus and LG Electronics, who often used LG Display’s panels.

Further information and specs when we get them but make sure you subscribe to our YouTube channel to stay up to date from CES.

Source: LG Display

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