Information display apparatus
Provided is an information display apparatus that significantly improves light resistance with respect to sunlight. The information display apparatus, which displays video-image information on a projection surface by a virtual image, includes in a housing partly having an opening: a video-image-light generator that generates video-image light for displaying the video-image information; a video-image-light processor that performs a predetermined optical processing to a video image generated by the video-image-light generator; and a projector that projects, onto the projection surface through the opening of the housing, the video-image light optically processed by the video-image-light processor so that a viewer is capable of virtually recognizing the video-image information as a virtual image in front of the projection surface, wherein a light path in the housing is provided with a suppressor selectively suppressing a P-polarizing component of light in a visible light region.
1. An information display apparatus displaying video-image information on a projection surface by a virtual image, the apparatus comprising, in a housing partly having an opening, a video-image-light generating apparatus, a video-image-light processor, and a projector,
the video-image-light generating apparatus configured to generate video-image light for displaying the video-image information, the video-image-light generating apparatus including a generator for selectively generating the video-image light by S-polarized light,
the video-image-light processor configured to perform a predetermined optical processing to a video image generated by the video-image-light generating apparatus, and
the projector configured to project, onto the projection surface through the opening of the housing, the video-image light optically processed by the video-image-light processor so that a viewer is capable of virtually recognizing the video-image information as a virtual image in front of the projection surface,
wherein a light path in the housing is provided with a suppressor selectively suppressing a P-polarizing component of light in a visible light region,
wherein the video-image-light processor and the projector are disposed on a straight-line optical axis from the video-image-light generating apparatus, and
wherein the suppressor is disposed between the video-image-light generating apparatus and the projector on the straight-line optical axis, and is configured to transmit an S-polarized light component and reflect a P-polarized light component in a direction vertical to the straight-line optical axis.
2. The information display apparatus according to claim 1 , further comprising a suppressor provided in the light path in the housing, the suppressor suppressing at least one or both of light rays in an infrared region and an ultraviolet region.
3. The information display apparatus according to claim 2 ,
wherein the projector has a concave mirror, and a thin film suppressing at least one of the light rays in the infrared region and the ultraviolet region is formed on the concave mirror.
4. The information display apparatus according to claim 3 ,
wherein the concave mirror has a reflectance of 85% or less to light in the visible light region.
5. The information display apparatus according to claim 1 ,
wherein the video-image-light generating apparatus includes an S-polarized solid light source.
6. The information display apparatus according to claim 3 ,
wherein the concave mirror is moved at such a position at a time of not operating the information display apparatus that external light traveling from the opening to an inside of the housing is reflected in a direction different from a normal light path at a time of operating the information display apparatus.