The present invention concerns substrates for a flexible flat panel display able The present invention concerns substrates for a flexible flat panel display (110) able to bent into a low radius of curvature, wherein the cell gap deviation is controlled and preferably minimised, even when the flexible flat panel display (110) is affected by pressure application or bending. According to a certain aspect there is provided composite substrates consisting of a substrate with a high Young's modulus and a substrate of low Young's modulus.