Transparent stretchable substrate and manufacturing method thereof

A method of manufacturing a transparent stretchable substrate, the method comprising:

• generating a substrate part formed of an elastic material;
• generating an auxetic having a reentrant structure including a plurality of unit structures, on the substrate part;
• and
• generating a fixing part on the substrate part,
• wherein the substrate part, the auxetic, and the fixing part contain the same elastic material, and
• wherein
• the substrate part and the auxetic further contain a curing agent,
• a ratio of the curing agent to the elastic material in the substrate part is a first ratio,
• a ratio of the curing agent to the elastic material in the auxetic is a second ratio,
• a ratio of the curing agent to the elastic material in the fixing part is a third ratio,
• the second ratio is greater than the first ratio and the third ratio, and the first ratio is equal to the third ratio,
• the auxetic further includes a plurality of microstructures, each of which is positioned inside a respective unit structure of the plurality of unit structures, and
• all of the plurality of microstructures included in the auxetic have the same shape that is consisted of two triangular shapes, which supports an inside of a reentrant shape of the respective unit structure, and minimizes a mechanical deformation distribution generated in response to an external force with respect to one axis.