An illumination system configured to provide an illumination beam, and comprising: a blue laser module, a green laser module, a red laser module, and a wavelength conversion component including a rotating disk and a wavelength conversion material; wherein the blue laser module is configured to provide a blue beam; wherein the green laser module is configured to provide a green beam; wherein the red laser module is configured to provide a red beam; wherein the wavelength conversion component has a wavelength conversion region defined by the wavelength conversion material configured to emit a converted beam as a yellow beam, and an optical output region as a non-wavelength conversion region provided with a scattering structure; characterized in that: in a first time interval, the red beam, the green beam, and the blue beam are sequentially transmitted to the optical output region, and the optical output region is configured to allow the red beam and the green beam to pass through the scattering structure, and to allow the blue beam to pass through or to reflect the blue beam, such that the illumination beam comprises one of the red beam, the green beam, and the blue beam; and in a second time interval, the blue beam is transmitted to the wavelength conversion region, and as irradiated by the blue beam the wavelength conversion material emits the converted beam, such that the illumination beam comprises the converted beam. wherein the blue laser module is configured to provide a blue beam; wherein the green laser module is configured to provide a green beam; wherein the red laser module is configured to provide a red beam; wherein the wavelength conversion component has a wavelength conversion region defined by the wavelength conversion material configured to emit a converted beam as a yellow beam, and an optical output region as a non-wavelength conversion region provided with a scattering structure; characterized in that: in a first time interval, the red beam, the green beam, and the blue beam are sequentially transmitted to the optical output region, and the optical output region is configured to allow the red beam and the green beam to pass through the scattering structure, and to allow the blue beam to pass through or to reflect the blue beam, such that the illumination beam comprises one of the red beam, the green beam, and the blue beam; and in a second time interval, the blue beam is transmitted to the wavelength conversion region, and as irradiated by the blue beam the wavelength conversion material emits the converted beam, such that the illumination beam comprises the converted beam. in a first time interval, the red beam, the green beam, and the blue beam are sequentially transmitted to the optical output region, and the optical output region is configured to allow the red beam and the green beam to pass through the scattering structure, and to allow the blue beam to pass through or to reflect the blue beam, such that the illumination beam comprises one of the red beam, the green beam, and the blue beam; and in a second time interval, the blue beam is transmitted to the wavelength conversion region, and as irradiated by the blue beam the wavelength conversion material emits the converted beam, such that the illumination beam comprises the converted beam.