Patent ID: 11867930
Assignee: CORETRONIC CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. A projection apparatus, comprising a filter module, a light combining module, a light valve, and a projection lens, wherein
the filter module comprises a transparent substrate, a filter layer and a diffusion layer, wherein:
the transparent substrate comprises a first surface and a second surface opposite to each other, wherein light from the light combining module enters the transparent substrate from the first surface and leaves the transparent substrate from the second surface;
the filter layer is disposed on one of the first surface and the second surface, 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 the other one of the first surface and the second surface, 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 and overlapped with the first filter region along an axial direction, and allows the corresponding light having the first waveband to pass through, and the second diffusion portion is arranged corresponding to and overlapped with the second filter region along the axial direction, 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.