US Patent 10188004 Foldable display device and holding structure thereof

A foldable display device includes a holding structure and a flexible display panel. The holding structure includes a soft outer housing, a first inner housing, a second inner housing, a first supporting stage, a second supporting stage, a first hinge, a first spring element, a second hinge, and a second spring element. The first hinge is connected to a same side of the first inner housing and the first supporting stage. The first spring element is connected to another same side of the first inner housing and the first supporting stage. The second hinge is connected to a same side of the second inner housing and the second supporting stage. The second spring element is connected to another same side of the second inner housing and the second supporting stage. The flexible display panel is located on the first and second supporting stages.