The Optimus mini three is a 'mini keyboard' - with 3 buttons that you can totally configure with images. Each button has a 262K colors, 96x96 PMOLED screen.

OLED type: 

Three 262K colors, 96x96 PMOLED screens

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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