LG explains Blue PHOLED screens
May 2, 2025
By Chris Forrester
The R&D carried out by LG Display on its Blue PHOLED screens (also known as Hybrid Tandem OLED) is proving attractive on a couple of levels. LG says it can now commercialise their production, and for consumers there would be a claimed 15 per cent reduction in power demand for its blue phosphorescent devices.
LG says it has taken a significant step closer to realising a “dream OLED” display which is an OLED panel that achieves phosphorescence for the red, green, and blue subpixels. The secondary benefit is a reduction in the risk of ‘burn in’ which affects the screen.
The end result is a high-quality image and yet a reduction in power demand. LG explains that the technology will also help battery consumption for portable devices.
As Techspot explains, OLED pixels use organic compounds that glow via either phosphorescence or fluorescence. Phosphorescent emitters are usually more power-efficient and age more slowly, so many OLED panels employ them for the red and green sub-pixels. Blue sub-pixels, however, still rely on the less efficient fluorescent process. Because blue light needs extra power to match the brightness of red and green, those pixels wear out faster, making screens more prone to burn-in.
LG’s solution has been to work with Universal Display Corp (UDC) to create these blue PHOLED panels. They technology uses a two-stack Tandem structure: one emissive layer consists of high-efficiency phosphorescent blue and the other is long-lasting fluorescent blue. This is different from the conventional single-stack WRGB design that uses a blue fluorescent layer alongside red and green phosphorescent layers.
LG Display will be showcasing the technology at SID Display Week 2025 in San Jose, California from May 11th.
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