until 2012 and now, we know why. Turns out, the Pearl manufacturer has been busy refining its screen tech acumen, and extending it to a variety of different surfaces. The Digital Reader recently caught up with Sriram Peruvemba, E Ink's VP of global sales and marketing, who confirmed that his company has developed a SIRF display that can be printed on cloth, effectively turning any t-shirt into a flashing, black-and-white billboard. E Ink's engineers have taken a similar approach to Tyvek cloth, creating a display that could make your vanilla postal envelopes a little more dynamic. And, as you might expect, the company has been experimenting with an e-ink screen capable of supporting colorful, full-motion video -- though it looks like E Ink still needs to smooth out some of the grainy kinks in that one. All three demo videos are available for your viewing pleasure, after the break.