Novel Driving Methods for Manipulating Oil Motion in Electrofluidic Display Pixels

By applying driving voltage schemes with different rising gradient and the same final voltage in an electrofluidic display device (EFD), several kinds of oil patterns have been generated. The results show that, in the initial stage of oil film splitting and contraction, driving voltage has a crucial influence on the microfluidic behavior and oil distribution in each pixel. Oil patterns significantly affect the pixel aperture and, ultimately, the reflectivity of the display panel. The oil pattern with fewer oil droplets has a higher aperture ratio and higher reflectivity. The observation that oil patterns can be controlled by varying driving schemes offers a new way of manipulating oil motion in EFD pixels.