Display system for viewing images on the front and back surfaces of a screen

摘要

A display unit which allows image lights utilizing circularly polarized light to be transmitted to an observer without degrading its polarization characteristics by an optical system such as lenses and screen is provided. The display unit which allows an image to be observed from the back of the screen on the opposite side from a light source by forming the image on the surface of the screen via the light source comprises a first liquid crystal panel for displaying images; a second liquid crystal panel for displaying images disposed so as to adjoin to the first liquid crystal panel; means for projecting linearly polarized image lights output respectively from the first and second liquid crystal panels on the surface of the screen simultaneously so that their polarization directions differ from each other; and means provided in the screen for transforming the projected linearly polarized lights into circularly polarized lights.