Transparent stretchable substrate without image distortion shows potential for next-generation displays

The extensive display materials, which are gaining a traction in the show market of the next generation, enjoy the ability to expand and bend freely, but the restrictions imposed on the current materials have led to deformed and misfortune screens.

Public flexible pillars are exposed to distortion on the screen due to the phenomenon of “Poissson”, as the stretch in one direction leads to a reduction in the screen in the vertical direction. In particular, the electronics that come close to the skin, such as wearable devices, are at risk of wrinkles or clouds on the skin during stretching and shrinkage, which leads to poor performance and performance.

A research team led by Dr. Jeong John, the son of the Korea Institute of Science and Technology (KIST) and Professor Youngtik Hong of the National University of Seoul, developed a pillar that extends with the nanoteic structure, which greatly reduces the percentage of Boason. Work is Published In the magazine Advanced materials.

This research is noticeable for its ability to reduce the percentage of Poisson while maintaining transparency, solving screen problems and scattering light at the same time.

The researchers achieved this by combining two main thoughts. Initially, they used the joint polymers of the mass, which are the polymer blocks associated together to align the internal nanoparticles. The total cobulimer (SIBS) consists of harsh polystyrene (PS) and polybuthylene softer (PIB), which can be arranged in one direction to increase the difference in flexibility between parallel and vertical trends to reduce contraction.

Although the traditional flexible has a Poisson ratio from 0.4 to 0.5, the researchers reduced it to the Poisson ratio of 0.07 or less, which means that there is almost no vertical contraction on the substrate, even in the direction of stretching, and the screen distortion is significantly reduced.

The second idea was to enter a process of collecting the shear to align the nanoparticles evenly across the substrate. Speed ​​differences are used between rollers and stages to apply standard cutting power at high temperatures. This process allowed the nanopolitan structures to be reliable on thick pillars without prejudice to transparency.

In experiments, the researchers found that there is little longitudinal contraction, even when the substrate was extended by more than 50 % in the vertical direction.

The researchers applied the advanced substrate on a real device and noticeable changes in the pixel arrangement. The traditional flexible substrate, when it extends by 50 %, showed distortion with a rough spacing between pixels or vertical pixel units stuck.

On the other hand, the alignment pillar with the nanopolitan structure had an equal arrangement of pixels, which led to an uninterrupted image and transparency without wrinkles or rough surfaces.

It is expected to use the new pillar that can be used as basic materials in various fields such as the next generation screens, wearable electronics, and solar cells. In addition, the declining cutting process used in this study can be applied to other common polymers and polymer movies, making it suitable for treating large spaces in a simple way.

“This research suggests a new way to develop an extension pillar that is free of confusion and completely transparent by accurately controlling the nanoparticles, and the process of generating cutting to implement it can be easily applied to huge production and manufacturing,” said Dr. Jeong John Sun of KIST.

“We are currently conducting research to achieve a real display without distorting even when tightening by transporting light emissions using this substrate.”