E-Ink Displays

E-Ink displays are Electrophoretic (which is motion of dispersed particles relative to a fluid under the influence of a spatially uniform electric field), they are made of tiny capsules (0.04mm in diameter) that contain two kinds of particles: black and white. Using electricity one can choose whether the white or black particles will rise to the top of the capsule - and so change the color of the pixel. Those particles remain in place when no electricity is used - and so the displays do not need power when the image does not change.



The pixels in an EPD are made up of tiny transparent capsules. The capsules are filled with a darkcolored oil. The oil contains titanium dioxide particles which are white and negatively charged. Electrodes are placed on both sides (front and back) of the capsules. If a positive voltage is applied to the front electrode, the particles are drawn towards the front electrode. The pixel appears white because light is reflected off the white particles. In the opposite case the particles are drawn to the back electrode and the pixel appears black because light is absorbed by the oil.

Titanium dioxide, also known as titanium(IV) oxide or titania, is the naturally occurring oxide of titanium, chemical formula TiO2. Titanium, the ninth most common element in the Earth's crust, is a metal commonly found in plants and animals. Titanium naturally interacts with oxygen to form titanium oxides, commonly found in ores, indigenous dusts, sands and soils.

E Ink's technology is commonly referred to as "bistable". Bistable means that the image on an E Ink screen will be retained even when all power sources are removed. E Ink displays are also referred to as "reflective displays." In an LCD, or "emissive display", light from a backlight is projected through the display towards your eyes. In an E Ink display, no backlight is used; rather, ambient light from the environment is reflected from the surface of the display back to your eyes.



Pervasivedisplays offeres a viriaty of E-Ink displays. EPD Extension Kit is designed to get started with ePaper development.



Texas Instroments offers BoosterPack for Small Graphical eInk Display.





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