US 11,656,524 B2
Electrophoretic display media with network electrodes and methods of making and using the same
Richard J. Paolini, Jr., Framingham, MA (US); and Jay William Anseth, Canton, MA (US)
Assigned to E Ink Corporation, Billerica, MA (US)
Filed by E INK CORPORATION, Billerica, MA (US)
Filed on Oct. 15, 2021, as Appl. No. 17/502,637.
Application 17/502,637 is a continuation of application No. 16/382,381, filed on Apr. 12, 2019, granted, now 11,175,561.
Claims priority of provisional application 62/656,660, filed on Apr. 12, 2018.
Prior Publication US 2022/0043319 A1, Feb. 10, 2022
Int. Cl. G02B 26/00 (2006.01); G02F 1/167 (2019.01); G02F 1/1676 (2019.01); G02F 1/16757 (2019.01); G02F 1/1675 (2019.01)
CPC G02F 1/167 (2013.01) [G02F 1/1676 (2019.01); G02F 1/16757 (2019.01); G02F 2001/1678 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A process for making an electrophoretic display medium,
the electrophoretic display medium including:
a substrate having a top surface,
a network electrode of conductive material disposed adjacent to and contacting the top surface,
an electrophoretic layer disposed adjacent to and contacting the top surface, the electrophoretic layer comprising a plurality of encapsulated droplets of an internal phase in a continuous polymeric binder,
the internal phase comprising a plurality of particles disposed in a fluid,
the particles being capable of moving through the fluid upon application of an electric field,
the electrophoretic layer being constructed such that a top portion of the plurality of encapsulated droplets includes spaces between the encapsulated droplets for the conductive material forming the network electrode, and a bottom portion of the plurality of encapsulated droplets of the internal phase being embedded within the continuous polymeric binder, and
a bottom electrode on the opposite side of the electrophoretic layer from the network electrode,
the process for making an electrophoretic display medium comprising:
a) applying a flowable conductive material onto the top surface of the substrate;
b) embedding the plurality of encapsulated droplets into the flowable conductive material, thereby displacing at least a portion of the flowable conductive material and initiating contact between the plurality of encapsulated droplets and the top surface of the substrate; and
c) solidifying the flowable conductive material into a network electrode thereby resulting in the network electrode having a volume resistivity of less than 1×103 Ohm-cm.