Liquid crystal glasses, projection display system and control method thereof

A control method, for controlling a projection display system, wherein the projection display system comprises a glasses system and a projection apparatus, the glasses system comprises a first liquid crystal shutter and a second liquid crystal shutter, and the projection apparatus comprises an illumination system and a color wheel, the illumination system is capable of providing a light beam, and after the light beam passes through the color wheel, the light beam is transmitted to the glasses system, the color wheel has a compensation zone and a plurality of color zones, and when the color wheel is rotated, the compensation zone and the color zones sequentially pass through the light beam, the compensation zone has a first sub compensation zone, a second sub compensation zone, and a third sub compensation zone, wherein the second sub compensation zone is located between the first sub compensation zone and the third sub compensation zone, and the control method is adapted to control the projection display system during a plurality of successive frame times, wherein each of the frame times comprises a first sub frame time, a second sub frame time, a third sub frame time, and a fourth sub frame time, the control method comprising:

• during the first sub frame time, making the first liquid crystal shutter be in a light transmitting state, making the second liquid crystal shutter be in a light shielding state, and making the color zones and the first sub compensation zone sequentially pass through the light beam;
• during the second sub frame time, respectively applying a first driving voltage and a second driving voltage to the first liquid crystal shutter and the second liquid crystal shutter, whereby the first liquid crystal shutter is switched from the light transmitting state to the light shielding state, the second liquid crystal shutter is switched from the light shielding state to the light transmitting state, and the second sub compensation zone passes through the light beam, wherein the second sub frame time is substantially equal to a time for the second sub compensation zone passing through the light beam;
• during the third sub frame time, making the first liquid crystal shutter be in the light shielding state, and making the second liquid crystal shutter be in the light transmitting state, and making the third sub compensation zone and the color zones sequentially pass through the light beam;
• and
• during the fourth sub frame time, respectively removing the first driving voltage and the second driving voltage applied on the first liquid crystal shutter and the second liquid crystal shutter, whereby the first liquid crystal shutter is switched from the light shielding state to the light transmitting state, the second liquid crystal shutter is switched from the light transmitting state to the light shielding state, and the first sub compensation zone, the second sub compensation zone, and the third sub compensation zone sequentially pass through the light beam, wherein the fourth sub frame time is substantially equal to a time for the compensation zone passing through the light beam, and 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.