Color electrophoretic displays using same polarity reversing address pulse
First Claim
1. 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, andwherein 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.
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Abstract
An electrophoretic display comprising a fluid including a first species of particles and a charge control agent disposed between first and second electrodes. When a first addressing impulse have an electrical polarity is applied to the medium, the first species of particles move in one direction relative to the electric field, but when a second addressing impulse, larger than the first addressing impulse but having the same electrical polarity, is applied to the medium, the first species of particles move in the opposed direction relative to the electric field.
221 Citations
10 Claims
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1. 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.
Specification