The Alienware m15 gaming laptop, now in its 2020 edition (the m15 R3) feature a 60Hz 15.6" 4K OLED display (or alternatively a 300 Hz IPS LCD one). The m15 R3 features Intel's 10th-gen CPUs (up to the 8-Core Core i9-10980HK) and Nvidia or AMD's Radeon GPUs.

Alienware M15 R3 photo

The Alienware m15 R3 started shipping in May 2020, you can find it on eBay.

OLED type: 

15.6" 4K AMOLED

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Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters