Remember the Sony Ericsson Xperia Pureness ? At a list price of $1,000, it'd be hard to forget -- but with a monochrome see-through display, the whole transparency thing was little more than a novelty on a phone that served little practical purpose. TDK might have the solution with its new transparent QVGA OLEDs , available now to manufacturers in monochrome and in a lovely color variant by the end of the year. At two inches, they offer 200ppi pixel density and are more secure than you might think: the light only shines in one direction, so you actually can't see any data from the back even though you can still see through the display. At a glance, the display's didn't seem as vibrant as the best AMOLEDs on the market, but then again, these are passive matrix -- and you can really tell in our videos after the break where the refresh scans stand out. Guess that's the price you pay for transparency, right? We've also got some video of the 3.5-inch flexible OLED screens TDK's got on hand; they're not transparent, but considering the long, narrow resolution, we can't help but think they'd make for amazing wristwatches (or high-tech glowstick replacements at raves).