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A physical model describing the electro-optic behavior of switchable optical elements based on electrowetting
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View: Figures


Image of FIG. 1.
FIG. 1.

Electrowetting display principle. Schematic cross section (a) without applied voltage, a homogeneous oil film is present. is the angle between the oil film and the fluoropolymer substrate at the corner of the square pixel. (b) -voltage applied, the oil film is contracted. refers to the angle between the spherical oil cap and the fluoropolymer surface. The corresponding top view photographs in (c) and (d) demonstrate a typical oil retraction obtained with a homogeneous electrode. The circle circumscribed on the pixel in (c) is used in the approximation of the angle, , at the pixel corner where the oil retraction commences. (d) The oil film contracts to form a spherical cap with a circular base area . In (e) a typical dependence of the angle, [Eq. (3)], on applied voltage is shown, along with corresponding value of [Eq. (2)] for ; ; ; . corresponds to the threshold voltage which must be exceeded before the oil film begins to retract.

Image of FIG. 2.
FIG. 2.

Comparison of the experimental (symbols) and calculated (lines) electro-optic curves. Pixel white area fraction as a function of applied voltage. Parameters used in experiments and calculations: (a) ; ; ; ; (b) ; , ; ; ; (c) ; ; ; ; and (d) ; ; ; .

Image of FIG. 3.
FIG. 3.

Electro-optic behavior predicted by the model. The calculations extend until the angle of the spherical oil cap, , is . (a) The effect of insulator thickness. Calculation parameters: ; ; ; (b) the effect of oil film thickness; ; ; . (c) The effect of pixel size: ; ; . (d) The effect of oil/water interfacial tension: ; ; .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A physical model describing the electro-optic behavior of switchable optical elements based on electrowetting