FLEXIBLE DISPLAY DEVICE

A flexible display device can include a flexible substrate including a display area in which a plurality of sub-pixels are disposed and a non-display area adjacent to the display area, an organic light emitting element disposed on the flexible substrate to correspond to each of the plurality of sub-pixels, an encapsulation layer on the organic light emitting element, a plurality of color filters disposed on the encapsulation layer to correspond to the plurality of sub-pixels, a black matrix disposed between the plurality of color filters, an adhesive layer disposed on the plurality of color filters and the black matrix, and a gray cover glass disposed on the adhesive layer. Further, the gray cover glass includes an intermediate layer and at least one chemically strengthened layer.