Filter module and projection device

A projection device, comprising an illumination system, a light valve, and a projection lens, wherein:

• the illumination system is configured to provide an illumination beam, and the illumination system comprising an excitation light source, a wavelength conversion module, and a filter module, wherein:
• the excitation light source is configured to emit an excitation beam;
• the wavelength conversion module is located on a transmission path of the excitation beam, and configured to convert the excitation beam into a converted beam, wherein the converted beam comprises a first color light with a first waveband and a second color light with a second waveband;
• and
• the filter module is located on a transmission path of the converted beam, and having at least one filter region, and being pervious to the first color light with the first waveband in the converted light, and filtering the second color light with the second waveband in the converted light, and the filter module comprising an absorptive filter and a dichroic film, wherein:
• the absorptive filter is located at the at least one filter region, and configured to absorb the second color light with the second waveband;
• and
• the dichroic film is located on the absorptive filter, and pervious to the first color light and reflecting the second color light, wherein the absorptive filter is configured to absorb the second color light coming from the dichroic film, and is pervious to the first color light, wherein the first waveband is greater than a first wavelength;
• the light valve is located on a transmission path of the illumination beam coming from the illumination system, and configured to convert the illumination beam into an image beam, wherein the illumination beam comprises the first color light;
• and
• the projection lens is located on a transmission path of the image beam, and the image beam being adapted to pass through the projection lens to form a projection beam.