a stereoscopic image display apparatus having a light source that defines at least one right and left light - cells which provide plural pairs of right and left lights . a spatial modulator , spaced apart from the light source , spatially modulates the right and left lights from the light source so as to focus the right and left lights on the eyes of at least one viewer . a display mode changer is capable of automatically changing the display mode of the image display between a stereoscopic image display mode and a normal plane image display mode . the display is automatically changed in accordance with the location of the viewer or in response to an instruction from the viewer .