Display over the sleeve

A rollable display is wearable on a sleeve. The display is part of a wrist-based device with a "U" shape. A part of the device is on top of the sleeve. The display can be rolled out for use as needed. The device itself may be flexible or bendable i.e. have a x-rigid, U-shape or may allow the "U" shape to be folded out, for example by a hinge or sequence of connected segments that can be rotated freely, but which keep their position after being moved. The display may be rolled out from under the sleeve and then over the sleeve along a predefined curve by means of a guiding mechanism. The device is easy to use, allows the use of large displays that may always be visible and allows freedom in the display design with respect to the direction in which the flexible display is rolled out.