I am no expert, either, but it seems you could create material that will attenuate OLED-originating light much more than other light. Ie. these glasses would not be completely transparent, they would be somewhat grey but would be much more opaque for OLED light than normal continuous spectrum. Even with polarized glasses you don't block all light, you block some and due to proximity to much more luminous sources (as seen through glasses) it appears dark.