A projection display system includes a glasses system, a driving unit and a projection apparatus. The driving unit is electrically connected to the glasses system for repeatedly applying or removing a voltage to/from the glasses system. The projection apparatus includes an illumination system and a color wheel. The color wheel is in a transmission path of a light beam provided by the illumination system. The color wheel has a compensation zone and a plurality of color zones. When the color wheel is rotated, the compensation zone and the color zones sequentially pass through the light beam. The compensation zone has first, second and third sub compensation zones. A time for the first sub compensation zone passing through the light beam is substantially equal to a time for the third sub compensation zone passing through the light beam. A liquid crystal glasses and a control method are also provided.