A portable terminal device, which employs a display unit utilizing a holographic screen, a main housing, a holographic screen, and an optical system. The holographic screen is disposed at a predetermined portion of the main housing while being exposed to an exterior of the main housing. The holographic screen optically displays information by means of image-light which is projected to the holographic screen. The optical system is spaced apart from the holographic screen and provides the holographic screen with the image-light.
The invention relates to a mobile device, which comprises a first housing and a second housing, which housings are arranged movable in relation to each other to at least a first and a second position; the first housing comprising a primary display for displaying information and arranged to be visible for a user at least in the first position; the device further comprising a passive image steering element that is adapted to steer at least a part of the view of said primary display to become visible for the user as a secondary display in the second position. This invention also relates to a image steering module, a method in a mobile device and a computer program for controlling a user interface of a device.
