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This story is from the category Display Technology
Date posted: 01/08/2010 By rapidly manipulating colored oil droplets stacked on top of each other, a new electrowetting (EW) technique could lead to the development of electronic paper displays that can produce high-resolution color video. Displays that use the EW effect could have several advantages over today?s e-readers and other portable flat panel displays, most of which are based on electrophoretic (EPh) technology. Dr. Han You and Professor Andrew Steckl of the Nanoelectronics Laboratory at the University of Cincinnati have experimentally demonstrated the new display for the first time, with their results published in a recent issue of Applied Physics Letters. The new EW display consists of a vertical stack of several layers. Three layers of oil dyed red, green, and blue are separated by two intervening layers of water. These layers, along with a hydrophobic insulating layer and hydrophilic grid, are sandwiched between electrodes. The layers of colored oil are also divided into aligned rows to create separate pixels. The researchers constructed two prototype arrays of 1000-2000 pixels, with pixel sizes of either 200x600 ?m2 or 300x900 ?m2. To change the color on the display, a low voltage is applied to the water layer next to one of the colored oil layers, which produces an EW effect. The effect causes the oil to move to one side and to be replaced by water, allowing the colored oil below to become visible. At a voltage of -10 V, the oil can be made to expose about 80-90% of the insulator's surface, giving the appearance of a colored pixel. When the same voltage is applied to a different color of oil in the vertical stack, the new color exposes the insulator?s surface, changing the pixel?s color. A white background can also be created by applying a voltage to all three layers of the stack. See the full Story via external site: www.physorg.com Most recent stories in this category (Display Technology): 22/05/2013: Penn Engineers’ Nanoantennas Improve Infrared Sensing |
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