University of Utah engineers have developed a polarizing filter that allows in more light, leading the way for mobile device displays that last much longer on a single battery charge and cameras that can shoot in dim light.
Polarizers are indispensable in digital photography and LCD displays, but they block enormous amounts of light, wasting energy and making it more difficult to photograph in low light.
The Utah electrical and computer engineering researchers created the filter by etching a silicon wafer with nanoscale pillars and holes using a focused gallium-ion beam. This new concept in light filtering can perform the same function as a standard polarizer but allows up to nearly 30 percent more light to pass through, says U electrical and computer engineering associate professor Rajesh Menon. The study is being published in November’s issue ofOptica, a new journal from The Optical Society.
Sunlight as well as most ambient light emits half of its energy as light polarized along a horizontal axis and the other half along a vertical axis. A polarizer typically allows only half of the light to pass because it’s permitting either the horizontal or vertical energy to go through, but not both. Meanwhile, the other half is reflected back or absorbed, but the resulting image is much darker. Polarizers are widely used by photographers, for example, to reduce glare in the image. They also are used in LCD displays to regulate what light passes through to create images on the screen.
“When you take a picture and put the polarized filter on, you are trying to get rid of glare,” Menon says. “But most polarizers will eliminate anywhere from to 60 to 70 percent of the light. You can see it with your eyes.”
Yet with Menon’s new polarizer, much of the light that normally is reflected back is instead converted to the desired polarized state, he says. The U researchers have been able to pass through about 74 percent of the light, though their goal is to eventually allow all of the light to pass through.
LCD displays on devices such as smartphones and tablets have two polarizers that ultimately throw away most of the light when working with the liquid crystal display. “If one can increase that energy efficiency, that is a huge increase on the battery life of your display. Or you can make your display brighter,” Menon says.
The Latest on: Polarizing filter
via Google News
The Latest on: Polarizing filter
- Breakthrough Photography announces more than 20 drop-in filters for Canon's EF-RF adapteron August 10, 2020 at 11:50 am
Breakthrough Photography, makers of many excellent filters, has announced the first third-party filters for Canon's popular EF-RF adapter with drop-in filter slot. New filters include various circular ...
- Ditch those dirty cloth masks, this reusable UV-C face mask makes it easy to breathe 99% clean airon August 9, 2020 at 8:51 am
In just the past few months we’ve seen masks that are transparent, masks designed with miniature air-purifiers in them, and now the UV Mask, a mask that actively uses UV-light to filter the air you ...
- These are the First Third-Party Drop-In Filters for Canon’s EF-RF Adapteron August 6, 2020 at 8:57 am
The filter maker Breakthrough Photography has just released the first third-party drop-in filters for Canon's popular EF-RF adapter, greatly increasing ...
- LIVE COVERAGE: Kansas voters set stage for U.S. Senate showdown, other key raceson August 3, 2020 at 2:23 pm
Roger Marshall for the Senate over polarizing conservative Kris Kobach ... Update 7:45 p.m. Tuesday, Aug. 4, 2020: Results are beginning to filter in from races to represent Kansas in the U.S. Senate ...
- Skylum Luminaron July 30, 2020 at 10:44 pm
Other cool tools not found in most editors are the Foliage Enhancer and the Polarizing Filter. Luminar has standard noise reduction tools that do a decent job of smoothing those bumpy low-light ...
- Scrutinizing the #ChallengeAccepted meme: Why do selfies have to be justified as activism?on July 30, 2020 at 5:09 pm
Since #challengeaccepted has to do with women and selfies (two polarizing topics on their own ... their picture that is plastered across news outlets with a black-and-white filter on top." As Lorenz ...
via Bing News