| 主权项 |
1. An electrophoretic display comprising:
a) a plurality of pixels each of which
(i) has a viewing side and a non-viewing side, and(ii) is sandwiched between one top electrode and one bottom electrode, and b) an electrophoretic fluid comprising a first type of particles, a second type of particles, and a third type of particles, all of which are dispersed in a solvent, wherein
(i) the first and second types of particles carry opposite charge polarities and have contrasting colors of a first color and a second color respectively,(ii) the first type of particle has a charge density at least twice as large as that of the second type of particle, and both the first and second types of particles have a charge density greater than the third type of particle;(iii) the third type of particles is non-charged or slightly charged, and(iv) the third type of particles is larger than the first and second types of particles and has the same color as the first or second type of particles, wherein: (A) a pixel displays either the first color or the second color at the viewing side; and (B) a pixel remains in the same color at the viewing side and has an intermediate color between the first color and the second color at the non-viewing side when a voltage is applied to the pixel, which is at least one third of the voltage required to drive the pixel from the first color to the second color or from the second color to the first color. |
