The present invention relates to a display device (1), associated with an instrument set (4), that comprises a low-definition display (3) and a semi-transparent mirror (2) disposed on an instrument panel, opposite said low-definition display. Said device is remarkable in that the semi-transparent mirror is positioned at an angle of more than 45 DEG relative to the low-definition display. An angle of more than 45 DEG , instead of the angle of 45 DEG generally used, reduces the space occupied by the semi-transparent mirror in the direction of the driver's vision. Positioning the semi-transparent mirror at an angle of more than 45 DEG relative to the low-definition display produces a reverse image where the top of the image intended to represent the horizon is nearer than the low portion that is supposed to be nearer. The invention also relates to an instrument set (4) incorporating the display device.