Patent ID: 7379229

Claim:
An electrophoretic display apparatus, comprising: a display portion, an electrophoretic dispersion liquid, contained in the display portion, comprising charged particles and a dispersion medium for dispersing the charged particles, and an electrode for driving the electrophoretic dispersion liquid, wherein a surface of charged particle, the dispersion medium, and a surface of an inner wall on which the charged particles are to be deposited satisfy any one of the following (A) to (D): (A) the charged particle surface is hydrophilic, the dispersion medium is hydrophobic or is hydrophobic and lipophobic, and the inner wall surface is hydrophilic, (B) the charged particle surface is hydrophobic, the dispersion medium is hydrophilic or is hydrophobic and lipophobic, and the inner wall surface is hydrophobic, (C) the charged particle surface is hydrophobic and lipophobic, the dispersion medium is hydrophobic or hydrophilic, and the inner wall surface is hydrophobic, with the proviso that the dispersion medium has a lower hydrophobicity than the inner wall surface when the dispersion medium is hydrophobic, and (D) the charged particle surface is hydrophobic and lipophobic, the dispersion medium is hydrophobic or hydrophilic, and the inner wall surface is hydrophobic and lipophobic.