Transparent light shutters: Windows that act like an LCD screen -- ScienceDaily
A novel liquid crystal technology allows displays to flip between transparent and opaque states -- hypothetically letting you switch your view in less than a millisecond from urban decay to the Chesapeake Bay. Their work appears this week in the journal AIP Advances, from AIP Publishing.
The idea of transparent displays has been around for a few years, but actually creating them from conventional organic light-emitting diodes has proven difficult.
"The transparent part is continuously open to the background," said Tae-Hoon Yoon, the group's primary investigator. "As a result, they exhibit poor visibility."
Light shutters, which use liquid crystals that can be switched between transparent and opaque states by scattering or absorbing the incident light, are one proposed solution to these obstacles, but they come with their own set of problems.
While they do increase the visibility of the displays, light shutters based on scattering can't provide black color, and light shutters based on absorption can't completely block the background. They aren't particularly energy-efficient either, requiring a continuous flow of power in order to maintain their transparent 'window' state when not in use. As a final nail in the coffin, they suffer from a frustrating response time to power on and off.
Tae-Hoon Yoon's group's new design remedies all of these problems by using scattering and absorption simultaneously. To do this, Yoon's group fabricated polymer-networked liquid crystals cells doped with dichroic dyes.
In their design, the polymer network structure scatters incident, or oncoming light, which is then absorbed by the dichroic dyes. The light shutters use a parallel pattern of electrodes located above and below the vertically aligned liquid crystals.
When an electric field is applied through the electrodes, the axes of the dye molecules are aligned with that of oncoming light, allowing them to absorb and scatter it. This effectively negates the light coming at the screen from its backside, rendering the display opaque -- and the screen's images fully visible.
"The incident light is absorbed, but we can still see through the background with reduced light intensity," Yoon said.
In its resting state, this setup lets light pass through, so power need only be applied when you want to switch from transparent window view to opaque monitor view. And because the display's on-off switch is an electric field, it has a response time of less than one millisecond -- far faster than that of contemporary light shutters, which rely on the slow relaxation of liquid crystals for their off-switch.
Future work for Yoon's group includes respectively increasing and decreasing the device's transmittance at the transparent and opaque states, as well as developing a bi-stable light shutter which consumes power only when states are being switched, rather than maintained.
Welcome to SUV System Ltd!
SUV System Ltd is ISO 90012008 Certified electronics distributor with 10 years of experiences.
We have built up long term business relationship with about many companies which are stockers and authorized agents. we have a steady and reliable supply to meet customer's demands to the greatest extent .Confidently, we are able to lower your cost and support your business with our years of professional service.
SUV System Ltd is Electronic Components Distributor Supplies,Find Quality Electronic Components Supplies Products IC(Integrated Circuits),Connectors,Capacitor,Resistors,Diodes,Transistors,LED at Suvsystem.com. Sourcing Other Energy, Environment, Excess Inventory Products from Manufacturers and Suppliers at Suvsystem.com
Electronic Components distributor:http://www.suvsystem.com
Connectors Distributor:http://www.suvsystem.com/l/Connectors-1.html
IC Distributor:http://www.suvsystem.com/l/IC(Integrated-Circuits)-1.html
LED Distributor:http://www.suvsystem.com/l/LED-1.html
Capacitor Distributor:http://www.suvsystem.com/l/Capacitor-1.html
Transistor Distributor:http://www.suvsystem.com/l/Transistors-1.html
Resistor Distributor:http://www.suvsystem.com/l/Resistors-1.html
Diode Distributor:http://www.suvsystem.com/l/Diodes-1.html
SUV System Ltd insists on the managing faith ofsincereness,speciality,foresight, win-win,so we build up stable-relationship customers located all over the world, including the States, Europe, Argentina, UAE, Malaysia, Australia,and India etc
we are focus on the following fields,and hope we can help you.
AGILENT LED LED ALTERA IC FAIRCHILD diodes Kingbrigt LED IC(Integrated Circuits) ELPIDA IC DIODES Transistors components ST Transistors TOSHIBA Transistors About US Schottky Diodes Multi-units Transistors BB IC VISHAY IC Freescale Semiconductor NEC Diodes Transistors Dialight LED Xilinx IC HARRIS IC Resistor Networks Renesas parts IC Electronic News Diodes Inc AD IC High Precision Resistors Capacitor TDK IC YAGEO Resistors SANYO IC Resistor Arrays NXP Transistors TOSHIBA Diodes Thin Film Resistors IDT IC Atmel IC Vishay resistors NS IC
http://www.suvsystem.com/a/44616.aspx
No comments:
Post a Comment