The recent expansion of electrophoretic displays beyond dedicated e-readers into retail signage, transportation information systems, and large-format advertising is not a marketing phenomenon. It follows from a straightforward physical property: bistability. In an electrophoretic display (EPD), the optical state of each pixel is maintained by the position of charged pigment particles within a dielectric fluid. Once the particles are set, no electrical bias is required to keep them in place. The display draws power only during the transition from one state to another.<\/p>\n\n\n\n
This characteristic alone explains most of the commercial interest. But the technology comes with a specific set of engineering constraints\u2014refresh rate, color gamut, temperature sensitivity, and manufacturing yield\u2014that determine where it can be deployed and where it cannot.<\/p>\n\n\n\n