MULTI-LAYER COMPOSITE SUPPORTING BACKPLANE OF FLEXIBLE PANEL

An embodiment of the invention provides a supporting backplane made of a composite metallic sheet with a two-layer structure. The composite metallic sheet is made of a first metal layer and a second metal layer, which are made of different metallic materials. The first metal layer and the second metal layer are combined by a rolling process. A hardness or an elastic coefficient of the first metal layer is greater than a hardness or an elastic coefficient of the second metal layer. Another embodiment of the invention provides a composite metallic sheet with more than two layers. The first metal layer and the second metal layer are interlacedly superposed and combined by a rolling process. The advantage and function of the invention are a great service life and an adjustable elasticity of the supporting backplane after being folded or bent by adjusting the relative thickness ratio of the first metal layer and the second metal layer.