MUMBAI, India, June 24 -- Intellectual Property India has published a patent application (202617060722 A) filed by E Ink Corporation on May 13, 2026, for Five-Particle Electrophoretic Medium With Improved Black Optical State.
Inventors include Telfer, Stephen J.; Wu, Ziyan; Tsai, Sherry Hsin-Yi; Cheng, Alex; and Gong, Zhe.
The application for the patent was published on June 12, 2026, under issue no. 24/2026.
Abstract: A color electrophoretic display with improved black optical state includes an electrophoretic medium having five types of charged electrophoretic pigment particles in a non-polar fluid: a first particle having a first optical property and first charge polarity; a second particle having a second optical property and second opposite charge polarity with a first charge magnitude; a third particle having a third optical property and second charge polarity with a second charge magnitude smaller than the first charge; a fourth particle having a fourth optical property and second charge polarity with a third charge magnitude smaller than the second charge; and a fifth particle having a fifth optical property and second charge polarity with a fourth charge magnitude greater than the first charge. The first and fifth particles are white and black, respectively, and the second, third, and fourth particles are each a different one of cyan, magenta, and yellow.
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