| 摘要 |
An electrophoretic display device, includes: an electrophoretic capacitor provided with an electrophoretic layer containing at least one kind of electrophoretic particle; and a ferroelectric capacitor provided with a ferroelectric layer containing a ferroelectric material. In the electrophoretic display device, the electrophoretic particle is allowed to move to conduct a display and thus a polarity of the ferroelectric layer is inverted by a current supply to the electrophoretic capacitor and the ferroelectric capacitor that are electrically connected with each other, and the display can be retained due to a remanent polarization of the ferroelectric layer even after the current supply is stopped. In the device, a formula (A) and a formula (B) are satisfied when a voltage to be applied to the ferroelectric capacitor is Vf, a charge stored in the ferroelectric capacitor when the voltage Vf is applied to the ferroelectric capacitor is Qf, a relative dielectric constant of the ferroelectric material is ∈f; an area of the ferroelectric layer in a planar view is Sf, a thickness of the ferroelectric layer is df, a relative dielectric constant of the electrophoretic layer is ∈EPD, an area of the electrophoretic layer in a planar view is SEPD, and a thickness of the electrophoretic layer is dEPD: <?in-line-formulae description="In-line Formulae" end="lead"?>∈o.∈EPD.SEPD.V/dEPD>Pr.Sf+∈o.∈f.Sf.Ec+∈o.∈EPD.SEPD/dEPD.Ec.df (A),<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>Pr.Sf<∈o.∈f.Sf.Ec+∈o.∈EPD.SEPD/dEPD.Ec.df (B).<?in-line-formulae description="In-line Formulae" end="tail"?>
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