Light source system and projection device using same

A projection device, comprising:

• a light source system comprising:
• a light source configured for emitting a first light, the first light being white light;
• a first wavelength selection structure on an output path of the first light, wherein the first wavelength selection structure comprises at least one wavelength selection portion configured for selectively transmitting the first light in a first target waveband and at least one first light-transmitting portion configured for transmitting the first light, the at least one wavelength selection portion and the at least one first light-transmitting portion are periodically on the output path of the first light, the light emitted from the first wavelength selection structure is defined as a second light;
• and
• a second wavelength selection structure on an output path of the second light, wherein the second wavelength selection structure comprises at least one supplementary portion configured for selectively transmitting the second light in a second target waveband and at least one second light-transmitting portion configured for transmitting the second light, the at least one supplementary portion and the at least one second light-transmitting portion are time-divisionally located on an output path of the light transmitted from the at least one first light-transmitting portion, the light emitted from the second wavelength selection structure is source light configured for displaying images;
• a light modulator configured for modulating the source light into the projection images;
• and
• a controller connected to the first wavelength selection structure and the second wavelength selection structure, wherein the controller is configured for controlling displacement of the first wavelength selection structure and the second wavelength selection structure, so that the projection device works in different display modes;
• wherein the first wavelength selection structure and the second wavelength selection structure are color wheels;
• wherein the first wavelength selection structure comprises two first wavelength selection portions, two second wavelength selection portions, two third wavelength selection portions, and two first light-transmitting portions;
• the two first wavelength selection portions, the two second wavelength selection portions, the two third wavelength selection portions, and the two first light-transmitting portions form a circular ring;
• wherein the second wavelength selection structure comprises two supplementary portions and two second light-transmitting portions;
• each of the two supplementary portions and each of the two second light-transmitting portions is a sector of a circle;
• the two supplementary portions and the two second light-transmitting portions form a circular ring.