Flat panel display device, stereoscopic display device, and plasma display device

A stereoscopic display device, wherein:

• the stereoscopic display device comprises a liquid crystal lens grating, a backlight system, and a display panel, the liquid crystal lens grating being arranged on a light exit surface of the display panel;
• the backlight system comprises a light source, a light homogenization mechanism, and a back frame;
• the back frame carries the light source and the light homogenization mechanism, the light homogenization mechanism guiding light from the light source to a light incidence surface of the display panel;
• and
• the back frame comprises at least first and second primary assembling pieces, in which the first primary assembling piece has an end forming at least two joint sections, each of the joint sections having a structure mating an end of the second primary assembling piece, the first primary assembling piece using one of the joint sections to join the corresponding end of the second primary assembling piece, the back frame further comprising a plurality of bracing pieces that are fixed to the primary assembling pieces, at least one of the bracing pieces comprising adjustable bumps mounted thereon in such a way as to be position adjustable so that each of the adjustable bumps is selectively set at one of a number of positions with respect to the bracing piece, the adjustable bumps providing various mounting structures.