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Lateral ink mobility and fringe field effects across the porous matrix of an electrophoretic display

机译:电泳显示器多孔基质上的横向油墨迁移率和边缘场效应

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This investigation studies fringe field between laterally adjacent electrodes in a reverse-emulsion electrophoretic display (REED). The display consists of a nanodroplet ink and a porous matrix that serves as the "paper" between planar electrodes. One relative advantage of this type of electronic paper display is that it can be produced with low-cost materials and manufacturing processes. A concern for image resolution, however, is the fringe field effect that occurs in the gaps between neighboring electrodes. Ideally the dye-containing nanodroplets in the ink move in a direction that is strictly perpendicular to the opposing pairs of electrodes. However, nanodroplet saturation and potential gradients from neighboring electrodes may result in lateral displacement of the nanodroplets as well. Accordingly, this study examines how fringe field between neighboring electrodes is affected by lateral spacing and applied voltage. Transient and steady-state effects were studied by fabricating and testing devices that were patterned with different lateral spacing between electrodes, and switching under different voltage levels. Relative luminance was extracted from digital microscope images, captured in the vicinity between neighboring electrodes. Measurements were recorded for electrode spacing of 20 μrn, 40 μm, 60 μm, and 80 μrn with devices switched at ±1.5 V and ±2.5 V. Gradients in luminance overlapped at lateral distances below 60 μm, and became distinct for left and right electrodes spaced by at least 80 μm. Higher applied voltage resulted in steeper transition between light and dark states, but exhibited distortion at electrode edges.
机译:这项研究研究反向乳液电泳显示器(REED)中横向相邻电极之间的边缘场。显示器由纳米液滴墨水和多孔基质组成,该多孔基质用作平面电极之间的“纸”。这种电子纸显示器的一个相对优势是,它可以用低成本的材料和制造工艺来生产。然而,对于图像分辨率的关注是在相邻电极之间的间隙中发生的边缘场效应。理想地,墨水中的含染料纳米滴在严格垂直于相对的电极对的方向上移动。然而,纳米液滴的饱和度和来自相邻电极的电势梯度也可能导致纳米液滴的横向位移。因此,这项研究检查了相邻电极之间的边缘场如何受到横向间距和施加电压的影响。通过制造和测试在电极之间具有不同横向间距并在不同电压水平下切换的器件进行研究,研究了瞬态和稳态效应。从数字显微镜图像中提取相对亮度,并在相邻电极之间捕获。记录了电极间距为20μrn,40μm,60μm和80μrn的测量值,并且设备在±1.5 V和±2.5 V上切换。亮度梯度在60μm以下的横向距离处重叠,并且左右电极变得不同间隔至少80μm。较高的施加电压导致亮态和暗态之间的过渡更陡峭,但在电极边缘显示出变形。

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