Sony is showing a new Walkman, the NWZ-S754. Engadget says that the contrast looks so good that it could be an OLED. It looks very much like the NW-A840 which do have a 2.8" OLED (Sony released quite a few OLED walkmans in the past few years).

Beside the beautiful display, the NWZ-S765 has 8GB memory (at least in the model they're showing at the IFA show). It comes in black or silver.

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Cambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDsCambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDs