Color electrophoretic displays using same polarity reversing address pulse

An electrophoretic medium comprising a fluid and first, second, and third species of particles disposed in the fluid,

• wherein the second and third species of particles bear charges of opposite polarities and the first species of particles bears a charge of the same polarity as the third species of particles, and wherein the colors of the three species are different,
• wherein when the electrophoretic medium is addressed with a first impulse in a first direction, the first species of particles move in a first direction relative to an electric field of the first impulse, and a viewing surface of the electrophoretic medium displays the color of the third species of particle,
• wherein when the electrophoretic medium is addressed with a second impulse larger than the first impulse and having the same polarity as the first impulse, the first species of particles move in a second direction that is opposite to the first direction, and the viewing surface displays a mixture of the first and third particles, and
• wherein when the electrophoretic medium is addressed with a third impulse greater than the second impulse, but having the same polarity as the first and second impulses, the viewing surface displays a mixture of the first, second and third particles.