A display device comprising: a cushion layer ; and a display panel disposed on a top surface of the cushion layer , the cushion layer includes a first member and a second member at least partially surrounding the first member , wherein the first member includes a first material having a first modulus of elasticity, wherein the second member includes a second material having a second modulus of elasticity that is smaller than the first modulus of elasticity, and wherein the first member includes a plurality of grooves disposed therein wherein the second member covers a top surface, a bottom surface, and a side surface of the first member and the plurality of grooves is included on both the top surface and the bottom surface of the first member , wherein impact resistance of the cushion layer is provided by the first member , wherein the plurality of grooves is configured for reducing a compress stress or a tensile stress applied to the cushion layer when bending the cushion layer enabling the first member to bend and the second member being also bendable, wherein the plurality of grooves includes a plurality of first grooves disposed within the top surface of the first member and arranged so as to point towards the bottom surface of the first member and a plurality of second grooves disposed within the bottom surface of the first member and arranged so as to point towards the top surface of the first member , wherein the cushion layer includes a bending portion (C), wherein the maximum width of each of the plurality of first grooves in the bending portion (C) is gradually increased closer to the center from the edge of the bending portion (C), and wherein the maximum width of each of the plurality of second grooves in the bending portion (C) is gradually decreased closer to the center from the edge in the first direction of the bending portion (C). a cushion layer ; and a display panel disposed on a top surface of the cushion layer , the cushion layer includes a first member and a second member at least partially surrounding the first member , wherein the first member includes a first material having a first modulus of elasticity, wherein the second member includes a second material having a second modulus of elasticity that is smaller than the first modulus of elasticity, and wherein the first member includes a plurality of grooves disposed therein wherein the second member covers a top surface, a bottom surface, and a side surface of the first member and the plurality of grooves is included on both the top surface and the bottom surface of the first member , wherein impact resistance of the cushion layer is provided by the first member , wherein the plurality of grooves is configured for reducing a compress stress or a tensile stress applied to the cushion layer when bending the cushion layer enabling the first member to bend and the second member being also bendable, wherein the plurality of grooves includes a plurality of first grooves disposed within the top surface of the first member and arranged so as to point towards the bottom surface of the first member and a plurality of second grooves disposed within the bottom surface of the first member and arranged so as to point towards the top surface of the first member , wherein the cushion layer includes a bending portion (C), wherein the maximum width of each of the plurality of first grooves in the bending portion (C) is gradually increased closer to the center from the edge of the bending portion (C), and wherein the maximum width of each of the plurality of second grooves in the bending portion (C) is gradually decreased closer to the center from the edge in the first direction of the bending portion (C). <EOS>