HYBRID SUBSTRATE FOR FOLDABLE DISPLAY WITH BUFFER LAYER FOR STRAIN RELIEF IN THE NEUTRAL POINT REGION

摘要

The present invention relates to a hybrid substrate for a foldable display having a buffer layer for attenuating tension in a neutral point region, and micro-cracks caused by a difference between opposing compressive and tensile forces acting inside and outside during repeated folding and unfolding operations (Micro Crack) ) To minimize the occurrence and maintain high-quality visibility over a long period of time. The present invention for this purpose, the front glass layer; A back polymer film layer laminated with a backplane; And a buffer layer interposed between the front glass layer and the back polymer film layer, wherein the buffer layer is made of a material having an adhesive force between the front glass layer and the back polymer film layer, and the tensile force during folding and unfolding operation of the foldable display. It is characterized in that it is located at the neutral point, which is the midpoint of the area where the compressive force acts, and performs a buffer function that attenuates the internal tension caused by the opposing tensile and compressive forces in the middle.