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US 2013/0077155 A1Published application
Additive for improving optical performance of an electrophoretic display
AssigneeE Ink California, LLC
InventorsMing Wang, Yu Li, Hui Du, Xiaojia Wang, Haiyan Gu, Roman Ivanov, Robert Sprague
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Abstract
The present invention is directed to an electrophoretic fluid comprising uncharged or lightly charged neutral buoyancy particles. The resulting fluid can improve not only image stability but also contrast ratio of a display device, without significantly affecting the switching speed. The present invention is also directed to an electrophoretic display comprising display cells filled with the electrophoretic fluid.
Claims24
An electrophoretic fluid comprising
- i) a first type of charged pigment particles which are white;
- ii) a second type of charged pigment particles which have a contrasting color and carry a charge polarity which is opposite of the charge polarity of the first type of charged pigment particles;
- and
- iii) uncharged or lightly charged neutral buoyancy particles, all three types of particles are dispersed in a solvent or solvent mixture, wherein the concentration of the uncharged or lightly charged neutral buoyancy particles in the electrophoretic fluid is more than 2.5% by weight, but not exceeding about 25% by weight.
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Dependencies are inferred from the claim text.