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US 8,257,614 B2Granted
Electrophoretic dispersions
AssigneeSiPix Imaging, Inc.
InventorsHaiyan Gu, HongMei Zang, Jiunn Jye Hwang, Xin Weng, Jack Hou, Chih-Yuan Liao, Shih-Wei Ho, Rong-Chang Liang
Life of this patent
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Abstract
This invention relates to improved electrophoretic dispersions and a method for improving the performance of an electrophoretic display. The invention also relates to a method of inducing or enhancing the threshold voltage of an electrophoretic dispersion.
Claims25
A method of selecting a threshold agent for inducing or enhancing the threshold voltage of an electrophoretic dispersion, comprising the steps of:
- (a) forming an electrophoretic dispersion comprising electrophoretic pigment particles dispersed in a dielectric solvent or solvent mixture;
- (b) adding an agent to said electrophoretic dispersion;
- and
- (c) testing the agent to determine if it meets the following criteria:
- (i) it carries or induces on the electrophoretic pigment particles, a charge opposite the charge of the electrophoretic pigment particles, and (ii) the charge characteristics provided by the threshold agent is insensitive to the change of an applied voltage, if the charge characteristics of the electrophoretic pigment particles is sensitive to the change of the applied voltage, or vice versa and
- (d) selecting the agent as a threshold agent if it meets the criteria.
3 more elements
Dependencies are inferred from the claim text.