To provide a display device or a display system by which an observer can obtain strong or natural stereoscopic sense from a two-dimensional image, and feel less tired.SOLUTION: A display system includes a display unit, a detection unit, and a control unit. The display unit has flexibility. The detection unit includes a function of detecting the state of observer's eyes for the display system and acquiring the detection information, and a function of supplying the detection information to the control unit. The control unit has a function of extracting the fatigue information of the observer from the detection information, and a function of changing the curvature of the display unit on the basis of the fatigue information. The display unit including a curved surface has a central angle of the curved surface in the range of preferably 20° or more and less than 90°.SELECTED DRAWING: Figure 1
DISPLAY SYSTEM