People do not touch the screen will be able to completely use the gestures to operate the phone? But also the use of ambient light automatically charge? These "black technologies" may be achieved in the near future, the key benefit from a both light and can absorb external light source of new light-emitting diode (LED) array.
Researchers from the University of Illinois at Urbana-Champaign and Dow Electronic Materials in Marlborough, Massachusetts, have recently published research in the journal Science. They show a new colloidal semiconductor nanorods that allow a single device to generate electromagnetism at the same time as the photoelectric effect, resulting in electroluminescence, converting electrical energy into light energy.
These nanorods with a diameter of less than 5 nanometers are made up of three semiconductor materials, one of which can emit and absorb visible light and the other two to control the flow of charge within the first material. Three kinds of materials can work together to make the LED panel in the light while sensing external light and make brightness adjustment.
Because this LED in the light and light between the two functions to switch the frequency of extremely fast, the naked eye can not identify this switch, so the display panel looks straight. At the same time, unlike the current cell phone on the light sensor, this LED panel metering and dimming occur in the pixel level, so not only according to the external ambient light source to adjust the panel brightness, but also sensor screen above the finger passing Fine light difference, thus allowing non-touch screen gestures to operate.
The researchers also found that the LED in the light at the same time, but also absorb the external light source and converted into current, similar to the function of solar panels, so the future use of this LED screen phone can also be charged by lighting to become "Self-powered" phone.
In addition, this new LED display can also be used as a large parallel communication array, between each other to achieve large data exchange.
At present, the researchers have successfully demonstrated the relevant functions with the new red LED array, trying to combine the red, blue and green color LED to achieve color array display, and by adjusting the composition of nanorods to improve the LED light absorption capacity.