E Ink’s two particle electronic ink system is made up of millions of tiny microcapsules, each about the diameter of a human hair. Each pixel on the screen of a display (tablets, eReaders, or signage) is a clear container of liquid, with negatively charged white particles and positively charged black particles floating in the liquid. Applying a charge across the container causes the particles to separate. A positive charge moves the black particles, and a negative charge moves the white particles.