Filter module and projection apparatus

A projection apparatus, comprising a filter module, a light combining module, a light valve, and a projection lens, wherein

• the filter module comprises a filter layer and a diffusion layer, wherein:
• the filter layer comprises a first filter region and a second filter region, the first filter region and the second filter region respectively allow light having a first waveband and light having a second waveband to pass through;
• and
• the diffusion layer is disposed on a side of the filter module opposite to the filter layer and comprises a first diffusion portion with a first haze value and a second diffusion portion with a second haze value, the first diffusion portion is arranged corresponding to the first filter region and allows the corresponding light having the first waveband to pass through, and the second diffusion portion is arranged corresponding to the second filter region and allows the corresponding light having the second waveband to pass through, and the first haze value is different from the second haze value;
• the light combining module is configured to emit the light having the first waveband and the light having the second waveband, wherein the light having the first waveband and the light having the second waveband are transmitted to the filter module, and converted into an illumination light beam by the filter module;
• the light valve is located on a transmission path of the illumination light beam and is configured to convert the illumination light beam into an image light beam;
• and
• the projection lens is located on a transmission path of the image light beam and is configured to project the image light beam.