Electrophoretic or electronic ink is the optical component of a film used in Electronic Paper Displays (EPD). Although it sounds, electronic ink is actually a really straightforward combination of chemistry, physics and electronics. It mimics the appearance of ordinary ink on paper.
Electronic ink is made up of millions of tiny microcapsules. Each microcapsule has about the diameter of a human hair. Each microcapsule contains positively charged white particles and negatively charged black particles suspended in a clear fluid. When a positive or negative electric field is applied, corresponding particles move to the top of the microcapsule where they become visible to the viewer. This makes the surface appear white or black at that spot.
3 color e-paper displays are originally engineered specifically for Electronic Shelf Labels (ESL). It works similarly to dual pigment system. From development, a charge is bought into pigments, and to a top and bottom electrode to facilitate movement. However, 3 color EPD is based on a micro-cup ink structure.
DKE are now providing monochromatic EPD as well as 3 color (Black, White and Red) EPD for clients. Besides providing a range of standard dot matrix EPDs, DKE also provides customization services, mostly on Segmented EPD.