Researchers from the University of California at Los Angeles (UCLA) have developed a transparent film LED, which can be repeatedly bent, stretched and twisted at room temperature, and it does not break and keeps its original shape, reports ScienceDaily.
“Our new material is the building block for fully stretchable electronics for consumer devices,” said Qibing Pei, a UCLA professor of materials science and engineering and principal investigator on the research. “Along with the development of stretchable thin-film transistors, we believe that fully stretchable interactive OLED displays that are as thin as wallpaper will be achieved in the near future. And this will give creative electronics designers new dimensions to exploit.
In the laboratory, the researchers repeatedly stretched the LED, and it returned to the original size and continued to work well. During the test the device has been deformed over 1 thousand times to a size 30% larger than the original.
The developers have also tried to set the limit of tensile strain and were able stretched the length of the LED more than twice the original size, while maintaining its performance. Also during the test folded and twisted it .
LED consists of three layers of the electroluminescent polymer sandwiched between electrodes made of an elastic polymer. The silver nanowires are used as conductors. Each of the layers can be stretched and other types of deformation at room temperature.
“The lack of suitable elastic transparent electrodes is one of the major obstacles to the fabrication of stretchable display,” Liang said. “Our new transparent, elastic composite electrode has high visual transparency, good surface electrical conductivity, high stretchability and high surface smoothness — all features essential to the fabrication of the stretchable OLED.”
Scientists have also demonstrated a flexible LED display with a group of pixels, the power of which is supplied by the grid electrodes embedded in silver nanowires. The tech properties of the sample have not been disclosed. However, such screen can be successfuly used in mobile development in future.
We should remind dd that all the leading developers of electronic components, including Samsung, LG and Sony, are engaged in the development of flexible displays. Over the last few years they have repeatedly demonstrated the results of their tests.