A display apparatus comprising: a flexible first layer comprising a bending area; an adhesive layer on an upper surface of the flexible first layer; and a flexible second layer attached to the flexible first layer by the adhesive layer, wherein a direction of internal stress at a first portion of the flexible first layer is different from a direction of internal stress at a second portion of the flexible first layer when the flexible first layer is in a flat state, and wherein a direction of internal stress at a third portion of the flexible second layer is different from a direction of internal stress at a fourth portion of the flexible second layer when the first layer is in the flat state, wherein the first portion and the second portion are at respective non-bending areas (NBA1, NBA2) of the flexible first layer, wherein the third portion and the fourth portion correspond to respective non-bending areas (NBA3, NBA4) of the flexible second layer, wherein the first portion is at one side of the bending area, and wherein the second portion is at another side of the bending area, wherein the third portion is at one side of the bending area, and wherein the fourth portion is at another side of the bending area, wherein the third portion is located over the first portion, and wherein the fourth portion is located over the second portion, wherein the direction of the internal stress at the first portion is different from the direction of the internal stress at the third portion, and wherein the direction of the internal stress at the second portion is different from the direction of the internal stress at the fourth portion. a flexible first layer comprising a bending area; an adhesive layer on an upper surface of the flexible first layer; and a flexible second layer attached to the flexible first layer by the adhesive layer, wherein a direction of internal stress at a first portion of the flexible first layer is different from a direction of internal stress at a second portion of the flexible first layer when the flexible first layer is in a flat state, and wherein a direction of internal stress at a third portion of the flexible second layer is different from a direction of internal stress at a fourth portion of the flexible second layer when the first layer is in the flat state, wherein the first portion and the second portion are at respective non-bending areas (NBA1, NBA2) of the flexible first layer, wherein the third portion and the fourth portion correspond to respective non-bending areas (NBA3, NBA4) of the flexible second layer, wherein the first portion is at one side of the bending area, and wherein the second portion is at another side of the bending area, wherein the third portion is at one side of the bending area, and wherein the fourth portion is at another side of the bending area, wherein the third portion is located over the first portion, and wherein the fourth portion is located over the second portion, wherein the direction of the internal stress at the first portion is different from the direction of the internal stress at the third portion, and wherein the direction of the internal stress at the second portion is different from the direction of the internal stress at the fourth portion.