Light source module and projection device

A projection device, comprising an illumination system, a light valve and a projection lens, the illumination system being configured to provide an illumination beam, the light valve being arranged on a transmission path of the illumination beam to convert the illumination beam into an image beam, the projection lens being arranged on a transmission path of the image beam to project the image beam out of the projection device, wherein the illumination system comprises a light source module, the light source module comprises a light source device, a wavelength conversion element, a light refractive element and a driving element, wherein:

• the light source device is configured to provide a beam;
• the wavelength conversion element comprises a substrate, a first optical layer and a second optical layer, and the first optical layer and the second optical layer are arranged on the substrate;
• the light refractive element is arranged between the light source device and the wavelength conversion element and is located on a transmission path of the beam, the light refractive element has a first portion and a second portion, the first portion is configured to refract the beam to the first optical layer, and the second portion is configured to refract the beam to the second optical layer, wherein at least one of the first optical layer and the second optical layer is configured to convert the beam into a converted beam, and the illumination beam comprises the converted beam;
• and
• the driving element is connected to the light refractive element and is configured to drive the light refractive element to move or rotate, so that the first portion and the second portion take turn to enter the transmission path of the beam.