Note, we ask that you please reference NDL and the Univ. of Cincinnati if you utilize these videos in any of your presentations.
Dielectrowetting Light Valves
Our large area, pixelation-free, optical shutter is shown below in operation. The substrate is held vertically (gravity does not effect the performance). We also are developing novel light-valve approaches with commercial partners such as Sun Chemical (see second video, technology not disclosed).
Self Healing Electrowettting Dielectrics
An electrowetting dielectric that self-heals even when punctured! See our publications page to find out how it works… (work performed in collaboration with Stein Kuiper and Philips Research Labs).
Switchable Retroreflector Film
See below videos of our switchable retroreflector film illuminated in the infrared (night-vision) and in the visible spectrum while immersed in water (green light). The third video is yet another mechanism to switch the retroreflector where we put switchable opaque oil films (blue in this test) inside each cornercube retroreflector.
Reconfigurable Liquid Metals
How can you reconfigure a liquid metal? Not so easy… We have developed a simple pressure driven approach to achieve this (first video is a logo switch, second is a microwave shield that switches, third is a D-ring).
Yes… Some work we are doing with AFRL that feeds into our biosensor program.
Electrofluidic Imaging Film
This was our very first 25 PPI demonstrator for our electrowetting imaging film. The technology is now in commercial development with >150 PPI operation shown, video speed demonstrated, and passive matrix addressing which is attractive for low-cost and low-power digital signage applications.
Basic Electrowetting Droplets.
The droplet on the left shows a basic experiment performed in an oil ambient, the droplet on the right shows clips from a high-speed camera after voltage was applied to the droplet and after it was released.
The video shown at left is one of our earliest devices, but it the video nicely shows prism operation. See if you can notice between frames where we briefly bias the sidewalls with the same voltages and create lenslets. The video shown at right is for a recently created electrowetting microlens array.
The left and middle columns are various videos of our electrowetting displays. The video at left column bottom is actually a video of the very first pixels we fabricated. Some of our work from 2007 is shown in the video at far right, where cell-phone resolution pixels are driven by an active matrix backplane on the bottom glass substrate.
Self Assembly and Electrofluidic Display
We dose liquid into ALL our devices via self assembly. We do this for microprism arrays, displays, microwell arrays, etc.. These simple techniques all us to create arrayed devices of very small resolution, and still be able to reliably does liquids into the devices even if there are 1,000,000's of devices on a single substrate.
Shown at left are oil:dye microwells and right are water:pigment microwells. These devices are also somewhat similar in structure to the retroreflector arrays we have created.
Laplace Barriers and Spontaneous Channel Formation
Shown at left is electrowetting transport combined with the virtual confinement of Laplace barriers (left). See use of Laplace Barriers and capillary fingering to create a complex network of fluid channels (middle). Shown at right are Laplace Barriers combined w/ a digital microfluidic array, and notice the ‘voltage’ off states and how the fluid geometry is retained by the Laplace Barriers (right).
NDL reported in 2007 that oil film breakup in electrowetting displays was fundamentally spinodal in nature. In the pixel at right see if you can notice some of the effects of differential Young-Laplace pressure after the oil film is broken up.
Light Wave Coupling
Ever wonder what it would look like if flat panel displays could be completely transparent in the off state (like a window)? Here we demonstrate with one of our partner companies this effect. The panel is 12" on a side. Several panels are layered and you are looking through an OFF panel (clear) to see the other panels when they are in the ON state.
Click Here for News clip shown on Fox 19.
933 Rhodes Hall
University of Cincinnati
Cincinnati, OH 45221
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Office: (513) 556-4763
Fax: (513) 556-7326
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