Projection display system

A projection display system, comprising:

• a light emitting device configured to emit, in a time sequence, first light and second light, the first light and the second light having different colors;
• a light splitting device configured to split the first light into first wavelength range light emitted along a first optical path and second wavelength range light emitted along a second optical path, and to guide at least part of the second light to be emitted along the first optical path;
• a first light modulator located in the first optical path and configured to modulate light emitted along the first optical path,
• a second light modulator located in the second optical path and configured to modulate light emitted along the second optical path, wherein the light emitted after being modulated by the first light modulator and the light emitted after being modulated by the second light modulator are combined to obtain third light emitted along a third optical path;
• and
• a third light modulator located in an optical path between the light emitting device and the light splitting device and configured to modulate the first light and the second light that are emitted by the light emitting device,
• wherein during one frame of image, the third light modulator modulates, according to image data of a first component in image data source, the first light to obtain a first monochromatic image light, and modulates according to image data of a second component in image data source, the second light to obtain a second monochromatic image light;
• and
• wherein the light splitting device is configured to split the first monochromatic image light into a first wavelength range image light and a second wavelength range image light that are emitted along the first optical path.