Patent TW-202212124-A (TW)
Title: Display device and substrate layered body
Inventor: YANO TAKANOBU
IPC: G02B5/30
Filed: 2020-09-07
Abstract: The problem of the present invention aims at a bendable display device to realize a display device that can suppress the layer or member with fragile anti-flexibility from breaking while facing the bending of the display device. The display device as a solution means is bendable and has: an optical film member, a first adhesive layer, a window member, a second adhesive layer and a laminated structure body. Wherein, the window member is laminated on one surface of the optical film member via the first adhesive layer, and the laminated structure body is laminated on another surface of the optical film member via the second adhesive layer and includes a panel member. The display device is characterized by: the surface of the laminate structure body at the second adhesive layer side having a layer that is more easily broken than the window member and the optical film member while performing the bending deformation; making the relation of the following equations (1), (2) and (3) be established between the following strain differences A, A', B and B', so that the extension rate of the easy-to-break layer after performing the bending deformation is suppressed to be a value smaller than the breaking extension rate: bending the display device at an angle of 180 DEG in a manner of the window member facing outwards, and allowing the bending deformation to be formed under the state of being an angle of 180 DEG, when the interval between the parallel and opposite the outermost surfaces of the display device is 4mm, the difference between the strain of the direction generated by one surface of the optical film member being orthogonal to the bending radius direction and the strain of the direction generated by the surface of the window member facing the surface of the first adhesive layer being orthogonal to the bending radius direction is determined to be A; using the outside and inside after performing the bending deformation and the same manner after allowing the display device to be bent and deformed so as to bend the optical film member and the window member at an angle of 180 DEG under the state of respective single-layer, and allowing the bending deformation to be formed under the state of bending at an angle of 180 DEG, when the interval between the parallel and opposite outermost surfaces of each optical film member and each window member is 4mm, the difference between the strain of the direction generated by the outside surface of the optical film member being orthogonal to the bending radius direction and the strain of the direction generated by the inside surface of the window member being orthogonal to the bending radius direction is determined to be A'; bending the display device at an angle of 180 DEG in a manner of the window member facing outwards and allowing the bending deformation to be formed under the state of bending at an angle of 180 DEG, when the interval between the parallel and opposite outermost surfaces of the display device is 4mm, the difference between the strain of the direction generated by another surface of the optical film member being orthogonal to the bending radius direction and the strain of the direction generated by the surface of the second adhesive layer facing the surface of the laminated structure body being orthogonal to the bending radius direction is determined to be B; and using the outside and inside after performing the bending deformation and the same manner after allowing the display device to be bent and deformed so as to bend the optical film member and the laminated structure body at an angle of 180 DEG under the state of respective single-layer, and allowing the bending deformation to be formed under the state of bending at an angle of 180 DEG, when the interval between the parallel and opposite outermost surfaces of each optical film member and each laminated structure body is 4mm, the difference between the strain of the direction generated by the inside surface of the optical film member being orthogonal to the bending radius direction and the strain of the direction generated by the outside surface of the laminated structure body being orthogonal to the bending radius direction is determined to be B'. 0.3 < A/A' < 1.2 (1) B/B' < 1.7A/A'-0.15 (2) 0 < B/B' < 1.25 (3).