NTT DoCoMo and Fujitsu have jointly developed a transparent OLED panel that is touch enabled on both sides. The companies unveiled a prototype 2.4" QVGA (320x240) panel:

 

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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