According to the Daily Mail, recently Keon Jae Lee and Sang-Hee Ko Park of the Department of Materials Science and Engineering of the Korea Advanced Institute of Technology (KAIST) have developed a display screen that can be attached to the skin surface and any kind of uneven surface. , And the screen will not cause any damage to the human body.
We know that TFT (Thin Film Transistor) displays are commonly used in notebook computers and smart phones, and the screen of the above project is to use ultrathin transparent TFTs as active matrix backplanes for flexible display devices. The technical principle behind this is that a high performance oxide TFT array is first fabricated on the top layer of a laser reactive substrate. After the laser is radiated from the backside of the substrate, only the oxide TFT array remains.
The reaction product (ultra-thin oxide) between the laser and the laser reaction layer was separated from the substrate and transferred to a 4 μm-thick ultrathin plastic. Ultimately, the transferred ultrathin oxide can drive the circuit while the attached oxide TFT can exhibit optical transparency up to 83% even under severe bending test cycling conditions, and 40 cm^2 V^(-1) The mobility of s^(-1).
Prof. Lee said that one of the challenges in developing this product is that although many materials have sufficient ductility, they have poor transparency, low power, and unstable heat. This is one of the reasons why many similar R&D projects stop there. Initially, the product tried to use inorganic electronic materials, but found that the material can not withstand high temperatures, so they use the new ILLO (Inorganic-Based Laser Lift-Off) inorganic laser stripping technology to solve its heat problem. The ILLO process breaks through the technical hurdles of high-performance transparent flexible displays and reduces costs by removing the polyimide substrate.
Since this high quality oxide semiconductor can be freely transferred to similar skin or other flexible substrates, it can be more easily applied to wearable devices and AR products.
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