NOVELTY - The method involves manufacturing a glass cloth (100) by configuring glass fiber in a fabric type, and manufacturing a film by impregnating the glass cloth into heat-resistant resin (110). Another film (200) is manufactured by hardening another heat-resistant resin. The latter film is laminated and combined on an upper part of a side of the former film by UV hardening or thermally hardening an intermediate material (120) applied between the films, where the latter heat-resistant resin is hardened by placing ultrafine ceramic powder inside the latter heat-resistant resin.    USE - Method for manufacturing a flexible substrate for a thin, transparent display panel i.e. LCD panel. Can also be used for organic electroluminescent (EL) displays, electronic paper (e-paper), solar cell panel and optical circuit board panel.    ADVANTAGE - The method allows laminating and combining one film on an upper part of a side of the other film, so that surface roughness improvement is obtained, while reducing coefficients of thermal expansion by UV hardening or thermally hardening of organic intermediate material between the films, thus improving size stability and surface roughness of the substrate, and hence increasing the industrial applicability of the substrate. The method enables forming a film complex structure to prevent curl generation caused by contraction and expansion of the substrate, thus improving scalability of the substrate in an easy manner, and simplifying manufacturing process of the substrate, and hence increasing production of the substrate. The method enables using a film made of heat-resistant transparent resin, which does not exhibit double refraction, thus minimizing difference of refractive indexes between the heat-resistant resin and the glass cloth, and allowing utilization of different materials for manufacturing the film, thus displaying a clear image, and reducing manufacturing cost of the substrate.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a flexible substrate.    Glass cloth (100)    Heat-resistant resin (110)    Intermediate material (120)    Film (200)