Flexible cover window with improved strength

A glass-based flexible cover window with improved strength comprising a planar portion formed so as to correspond to a planar region of a flexible display and a folding portion formed so as to be connected to the planar portion, the folding portion being formed so as to correspond to a folding region of the flexible display, wherein the flexible cover window comprises:

• a glass substrate;
• an adhesive buffer layer formed on a front surface of the glass substrate, wherein the adhesive buffer layer is made of an optically clear resin (OCR) having a strength (storage modulus) greater than 0.01 GPa and less than or equal to 1 GPa, wherein the optically clear resin is selected from the group consisting of acrylic, epoxy, urethane, urethane acrylic composite, and a urethane composite;
• a protective film layer formed on the adhesive buffer layer, wherein the protective film layer has a higher rigidity than the adhesive buffer layer, and a strength of the protective film layer is different from a strength of the adhesive buffer layer, and the protective film layer is made of any one of polypropylene (PP) and polyethylene naphthalate (PEN);
• and
• a hard coating layer formed on the protective film layer,
• wherein the protective film layer on which the hard coating layer is formed is laminated using the adhesive buffer layer on the front surface of the glass substrate, so that the hard coating layer, the protective film layer and the glass substrate form a lamination structure, and the adhesive buffer layer is a UV-hardened layer, and
• wherein a thickness of the adhesive buffer layer is greater than a thickness of the hard coating layer, and the thickness of the hard coating layer is smaller than a thickness of the protective film layer.