Electrophoretic ink composed of particles with field dependent mobilities
First Claim
1. An electrophoretic display having a viewing surface, comprising:
- an image pixel comprising;
a first plurality of particles having a first mobility, μ
1(V); and
a second plurality of particles having a second mobility, μ
2(V), wherein μ
1(V1)>
μ
2(V1) and μ
2(V2)>
μ
1(V2) to produce a first optical state determined by a motion of the first plurality of particles by application of a first addressing voltage V1 and a second optical state determined by a motion of the second plurality of particles by application of a second addressing voltage V2.
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Abstract
An electrophoretic display has a viewing surface, and includes an image pixel. The image pixel includes a first plurality of particles having a first mobility, and a second plurality of particles having a second mobility. At a first addressing voltage, the first mobility is greater than the second mobility. At a second addressing voltage, the second mobility is greater than the first mobility. At least one of the first and second mobilities is a variable function of voltage, i.e., a function of an applied electric field. Application of the first addressing voltage produces a first optical state, which is determined by a motion of the first plurality of particles. Application of the second addressing voltage produces a second optical state determined by a motion of the second plurality of particles.
224 Citations
21 Claims
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1. An electrophoretic display having a viewing surface, comprising:
an image pixel comprising;
a first plurality of particles having a first mobility, μ
1(V); and
a second plurality of particles having a second mobility, μ
2(V), wherein μ
1(V1)>
μ
2(V1) and μ
2(V2)>
μ
1(V2) to produce a first optical state determined by a motion of the first plurality of particles by application of a first addressing voltage V1 and a second optical state determined by a motion of the second plurality of particles by application of a second addressing voltage V2.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of forming an image in an electrophoretic display having a viewing surface, comprising the steps of:
-
addressing an image pixel with a first addressing voltage, V1, to produce a first optical state determined by a motion of a first plurality of particles having a first mobility, μ
1(V); and
addressing the image pixel with a second addressing voltage, V2, to produce a second optical state determined by a motion of a second plurality of particles having a second mobility, μ
2(V), wherein μ
1(V1)>
μ
2(V1) and μ
1 (V2)<
μ
2 (V2). - View Dependent Claims (16, 17, 18, 19, 20, 21)
-
Specification