US 12,080,251 B2
Colored electrophoretic displays
Stephen J. Telfer, Arlington, MA (US); Stephen Bull, Windham, NH (US); Jennifer M. Morrison, Wakefield, MA (US); Luke M. Slominski, Sharon, MA (US); David Darrell Miller, Wakefield, MA (US); Olga Vladimirova Barykina-Tassa, Boston, MA (US); Christopher L. Hoogeboom, Burlington, MA (US); Ana L. Lattes, Newton, MA (US); Lee Yezek, Watertown, MA (US); Brandon MacDonald, Arlington, MA (US); Kosta Ladavac, Somerville, MA (US); and Craig A. Herb, Medford, MA (US)
Assigned to E Ink Corporation, Billerica, MA (US)
Filed by E INK CORPORATION, Billerica, MA (US)
Filed on Aug. 30, 2022, as Appl. No. 17/899,246.
Application 17/899,246 is a continuation of application No. 16/858,999, filed on Apr. 27, 2020, granted, now 11,468,855.
Application 16/858,999 is a continuation of application No. 15/854,124, filed on Dec. 26, 2017, granted, now 10,678,111, issued on Jun. 9, 2020.
Application 15/854,124 is a continuation of application No. 14/849,658, filed on Sep. 10, 2015, granted, now 9,921,451, issued on Mar. 20, 2018.
Claims priority of provisional application 62/169,710, filed on Jun. 2, 2015.
Claims priority of provisional application 62/169,221, filed on Jun. 1, 2015.
Claims priority of provisional application 62/048,591, filed on Sep. 10, 2014.
Prior Publication US 2023/0005439 A1, Jan. 5, 2023
Int. Cl. G02F 1/167 (2019.01); C09B 67/08 (2006.01); G02F 1/1685 (2019.01); G09G 3/20 (2006.01); G09G 3/34 (2006.01); G02F 1/1675 (2019.01)
CPC G09G 3/344 (2013.01) [C09B 67/0013 (2013.01); G02F 1/167 (2013.01); G02F 1/1685 (2019.01); G09G 3/2003 (2013.01); G02F 2001/1678 (2013.01); G09G 2300/0452 (2013.01); G09G 2310/068 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An electrophoretic medium comprising:
(a) a fluid;
(b) a plurality of first and a plurality of second particles dispersed in the fluid, wherein the first and second particles each have polymer coatings such that a volume fraction of polymer for the first and second particles is at least 25 percent of a volume of the particle, wherein the first and second particles bear charges of opposite polarity, and wherein the first particle is a light-scattering particle and the second particle is a non-light scattering particle and has one of the subtractive primary colors;
(c) a plurality of third and a plurality of fourth particles dispersed in the fluid, wherein the third and fourth particles either have no polymer shell, or the third and fourth particles each have a polymer shell such that a volume fraction of polymer for the third and fourth particles does not exceed 15 percent of the volume of the particle, wherein the third and fourth particles bear charges of opposite polarity, and wherein the third and fourth particles are non-light scattering particles and each has a subtractive primary color different from each other and different from the second particles;
wherein the electric field required to separate an aggregate formed by the third and the fourth types of particles is greater than the electric field required to separate an aggregate formed from any other two types of particles in the fluid.