A liquid crystal display (LCD) recently comes into common use. It is possible for this display unit to provide the
same size of displaying area as the image screen on the panel. Thus the conventional display can show only one
screen, but it is impossible to enlarge the size of a screen, for example twice. To enlarge the display area, the
authors have developed an enlarging method of display area using a mirror. Our extension method enables the
observers to show the virtual image plane and to enlarge a screen area twice. In the developed display unit, we
made use of an image separating technique using polarized glasses, a parallax barrier or a lenticular lens screen for
3D imaging. However, each technique has a defect at viewing an image. In the glasses method, an observer
needs to wear the special glasses for a viewing screen. The slit or lens sheet reduces the resolution in half. To
solve these problems, we develop a new virtual display system using a unidirectional diffusing image screen.
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