Colored electrophoretic displays
First Claim
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1. A method of driving an electrophoretic display comprising a layer of the electrophoretic medium disposed between first and second electrodes, with the first electrode forming the viewing surface of the display and the electrophoretic medium comprising a plurality of first, second, third, and fourth particles dispersed in a fluid, the display having a voltage controller capable of applying voltage differences of +VH, +VL, 0, −
- VL and −
VH between the first and second electrodes respectively, where;
+VH>
+VL>
0>
−
VL>
−
VH the method comprising, in either order;
(a) displaying at the viewing surface alternately the color of the fourth particles, and the color of a mixture of the fourth and second particles by applying between the electrodes a series of first pulses of either +VH or −
VH and of a polarity which drives the fourth particles towards the first electrode, said series of first pulses alternating with second pulses of +VL or −
VL, and of opposite polarity to, but greater duration than, the first pulses; and
(b) displaying at the viewing surface alternately the color of the third particles and the color of a mixture of the third and second particles by applying between the electrodes a series of third pulses of either +VH or −
VH and of a polarity which drives the third particles towards the first electrode, said series of third pulses alternating with fourth pulses of +VL or −
VL, and of opposite polarity to, but greater duration than, the third pulses.
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Abstract
An electrophoretic medium comprises a fluid, a first, light scattering particle (typically white) and second, third and fourth particles having three subtractive primary colors (typically magenta, cyan and yellow); at least two of these colored particles being non-light scattering. The first and second particles bear polymer coatings such that the electric field required to separate an aggregate formed by the third and the fourth particles is greater than that required to separate an aggregate formed from any other two types of particles. Methods for driving the medium to produce white, black, magenta, cyan, yellow, red, green and blue colors are also described.
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Citations
5 Claims
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1. A method of driving an electrophoretic display comprising a layer of the electrophoretic medium disposed between first and second electrodes, with the first electrode forming the viewing surface of the display and the electrophoretic medium comprising a plurality of first, second, third, and fourth particles dispersed in a fluid, the display having a voltage controller capable of applying voltage differences of +VH, +VL, 0, −
- VL and −
VH between the first and second electrodes respectively, where;
+VH>
+VL>
0>
−
VL>
−
VHthe method comprising, in either order; (a) displaying at the viewing surface alternately the color of the fourth particles, and the color of a mixture of the fourth and second particles by applying between the electrodes a series of first pulses of either +VH or −
VH and of a polarity which drives the fourth particles towards the first electrode, said series of first pulses alternating with second pulses of +VL or −
VL, and of opposite polarity to, but greater duration than, the first pulses; and(b) displaying at the viewing surface alternately the color of the third particles and the color of a mixture of the third and second particles by applying between the electrodes a series of third pulses of either +VH or −
VH and of a polarity which drives the third particles towards the first electrode, said series of third pulses alternating with fourth pulses of +VL or −
VL, and of opposite polarity to, but greater duration than, the third pulses.- View Dependent Claims (2, 3, 4)
- VL and −
-
5. A method of driving an electrophoretic display comprising a layer of the electrophoretic medium disposed between first and second electrodes, with the first electrode forming the viewing surface of the display and the electrophoretic medium comprising a plurality of first, second, third, and fourth particles dispersed in a fluid, the display having a voltage controller capable of applying voltage differences of +VH, 0, and −
- VH between the first and second electrodes respectively, where;
+VH>
0>
−
VHthe method comprising, in either order; (a) displaying at the viewing surface alternately the color of the fourth particles, and the color of a mixture of the fourth and second particles by applying between the electrodes a series of first pulses of either +VH or −
VH and of a polarity which drives the fourth particles towards the second electrode, said series of first pulses alternating with second pulses of +VH or −
VH, and of opposite polarity to, but greater duration than, the first pulses; and(b) displaying at the viewing surface alternately the color of the third particles and the color of a mixture of the third and second particles by applying between the electrodes a series of third pulses of either +VH or −
VH and of a polarity which drives the third particles towards the second electrode, said series of third pulses alternating with fourth pulses of +VH or −
VH, and of opposite polarity to, but greater duration than, the third pulses.
- VH between the first and second electrodes respectively, where;
Specification
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Current AssigneeE Ink Corporation (E Ink Holdings Incorporated)
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Original AssigneeE Ink Corporation (E Ink Holdings Incorporated)
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InventorsTelfer, Stephen J., Bull, Stephen, Miller, David Darrell, Hoogeboom, Christopher L., Lattes, Ana L., MacDonald, Brandon, Ladavac, Kosta
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Primary Examiner(s)Thomas, Brandi N
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Application NumberUS15/854,143Publication NumberTime in Patent Office721 DaysField of Search359237, 359242, 359265-267, 359270-273, 359290-292, 359295, 359296, 359298US Class CurrentCPC Class CodesC09B 67/0013 with polymeric coatingsG02F 1/167 by electrophoresisG02F 1/1685 Operation of cells; Circuit...G02F 2001/1678 characterised by the compos...G09G 2300/0452 Details of colour pixel set...G09G 2310/068 Application of pulses of al...G09G 3/2003 Display of colours specific...G09G 3/344 based on particles moving i...
