Abstract
The switchable oil layer driven by electrowetting gives visible color and light valve control, which is the basis of Electro-Fluidic Displays. The colored oil’s property is a key factor that influences the Electro-Fluidic Displays switching behavior. A purple oil was formulated by the oil-soluble purple dye in decane in this study. The dye molecule itself is nonpolar and it doesn’t dissolve in water. The concentration of colored oil influenced the oil/water interfacial tension and oil viscosity. The relationship of EFD switching behavior with oil/water interfacial tension, oil viscosity, and oil conductivity has been systematically investigated. The oil/water interfacial tension decreased with increasing oil concentration, in the meanwhile, the conductivity increased. Oil conductivity was one of the key factors that influenced the Electro-Fluidic Displays optical property. We found for the first time that at the lower oil concentration (2% - 10%), the interfacial tension plays a main role effect on the rupture voltage and response time, but as the conductivity of higher concentration of colored oil increased (at 20%), the rupture voltage-controlled both by conductivity and interfacial tension.
Highlights
The electrowetting phenomenon was first described in 1875 by Lippmann [1]
We found for the first time that at the lower oil concentration (2% - 10%), the interfacial tension plays a main role effect on the rupture voltage and response time, but as the conductivity of higher concentration of colored oil increased, the rupture voltage-controlled both by conductivity and interfacial tension
We investigated the relationship of the colored oil/water interfacial tension, colored oil viscosity, and conductivity of different oil concentrations and surfactant concentrations with the effect on electro-fluid display cell rupture voltage and switching behavior
Summary
The electrowetting phenomenon was first described in 1875 by Lippmann [1]. Nowadays, a hydrophobic insulating layer on the electrode is normally used to reduce contact angle hysteresis to get better electrowetting behavior [2]. A research group of Samsung discovered the “flow back” defect They found that the dyed oil film in the pixel tends to reduce the contraction even if the voltage is maintained [14]. They discussed that this flow back effect is mainly dependent on the structure of the dye and that more symmetrical molecules provide shorter flow back time. We investigated the relationship of the colored oil/water interfacial tension, colored oil viscosity, and conductivity of different oil concentrations and surfactant concentrations with the effect on electro-fluid display cell rupture voltage and switching behavior
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