Abstract: A display device (2) for mobile telecommunications apparatus, which display device comprises: i) a display panel (4); ii) pancake optical means (6) for producing: a) a collimated image to an eye (8) of a viewer so that the image is able to be seen normally from distances as close as it is physically possible to get the eye (8) of the viewer to the display panel (4); and b) an un-collimated image which is equivalent to viewing the display panel (4) directly; iii) polarising filter means (10) for suppressing the un-collimated image; and iv) rotator means (14) for rotating at least part of the filter means (10) through 90° in order to allow the un-collimated image to be used, whereby the display device (2) is such that the user can select an un-collimated viewing mode if the image is of a simple content, and a viewer can select a collimated viewing mode if the image is of a detailed content.