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1. (WO2018136250) COLOR ORGANIC PIGMENTS AND ELECTROPHORETIC DISPLAY MEDIA CONTAINING THE SAME

Pub. No.:    WO/2018/136250    International Application No.:    PCT/US2018/012733
Publication Date: Fri Jul 27 01:59:59 CEST 2018 International Filing Date: Tue Jan 09 00:59:59 CET 2018
IPC: G02F 1/167
Applicants: E INK CALIFORNIA, LLC
Inventors: LIU, Xin
DU, Hui
WANG, Ming
Title: COLOR ORGANIC PIGMENTS AND ELECTROPHORETIC DISPLAY MEDIA CONTAINING THE SAME
Abstract:
An electrophoretic display medium includes a front and a rear electrode, at least one of the front and rear electrodes being transparent, and an encapsulated dispersion fluid containing a plurality of pigments positioned between the front and rear electrode. The plurality of pigments includes a first and a second type of organic pigment particle. The first type of organic pigment particle has a first color and a first charge polarity. The second type of organic pigment particle has a second color different than the first color and a second charge polarity the same as the first charge polarity. At least one of the first and second types of organic pigment particle includes a silica coating and a polymeric stabilizer covalently bonded to the silica coating.