In this study, a hyper-flexible 3D display (3D-HFD) is proposed by controlling dynamic motions of string-like hyper-flexible element (HFE) and luminous patterns of LED on HFE. A prototype for 3D-HFD is constructed and experiments are executed to show that it can display several patterns and can form three-dimensional surface by controlling turning speed. A 3D dynamic model of HFE is considered to simulate and design displayed patterns of the 3D-HFD. Simulations are compared to experiments with the prototype and shown to be valid.