Guangzhou Oed Technologies, Inc.

Guangzhou Oed Technologies Co., Ltd.

Xi Zeng

Yu Wei Chen

Lei Zhang

Yu Chen

Zuliang Liu

Songli Wei

The invention provides pigment particles and an organic modification layer formed on a surface of the pigment particles; the organic modification layer is a surfactant layer or a polymer material layer formed on the surface of the pigment particles; an organic matter content over the specific surface area Wof the pigment particles is in a range of 0.1-2% g/m. The surface-modified pigment particles provided by the invention have good stability, and the electrophoretic display prepared by using the surface-modified pigment particles of the invention has good optical performance.

Surface-modified pigment particles for electrophoretic display and electrophoretic display device

An electrophoretic display medium and preparing method thereof. The electrophoretic display medium comprises: negatively or positively-charged pigment particles; neutral pigment particles with colors different from the charged pigment particles; and low-polar and/or non-polar dispersing solvent. The method of preparing the electrophoretic display medium comprises: synthesizing neutral pigment particles; synthesizing charged pigment particles; and preparing electrophoretic display medium. The method of synthesizing the neutral pigment particles comprises: mixing together pigment particles, macromonomers, coupling-agents and chain-initiators for polymeric reaction in the solvent, and reacting at a temperature of 30-120&#xb0; C. for 4-48 hours. The method is applied to many kinds of inorganic oxides, inorganic salts and complex inorganic salt pigments. This method fundamentally avoids agglomeration caused by attraction of positively and negatively-charged electrophoretic particles, greatly enhancing display performance. The steps of synthesizing particles are simple and the preparing procedure of the electrophoretic medium is simplified, making the whole process simple and highly efficient.

Electrophoretic display medium and preparing method thereof

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Guangzhou, China

Xi Zeng