The motion of charged
particles of pigments suspended in a liquid under the influence of an electric
field is known as Electrophoresis. Electrophoretic image displays use this
phenomenon. The main parts of this display are dc voltage source, base plate,
electrode segments, coloured liquid, transparent electrode and electrophoretic
pigment particles. A liquid suspension consists of pigment particles are
sandwiched between a pair of electrodes. One among the two electrodes is
transparent and made as common electrode. On the application of dc electric
field, pigment particles move electrophoretically towards electrodes and this
motion is dependent on the polarity of the charge on the particles. The
transparent electrode is preferably maintained at ground potential and segment
electrodes at different potentials. Colour combinations of both the pigment
particles and the suspending liquid can be used to achieve a desired colour
display. Electrophoretic image displays are characterized by large character
size, low power dissipation and internal memory.
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