Information display device
An information display device that displays image information as a virtual image on a projection surface, the device including: an opening portion at a part of the housing, image light generating means for generating image light, image light processing means for performing a predetermined optical process on the image light, and image projecting means for projecting the image light such that a viewer can recognize the image information as the virtual image in front of the projection surface, and an optical element in which a reflective polarizing plate is fixed to a substrate having a transmissive property with an adhesive agent or with a pressure-sensitive adhesive agent is provided in a part of an optical path inside the housing, as means for selectively reflecting a P-polarized light component of light in a visible light region, and a moisture-proof film is provided on a surface of the reflective polarizing plate.
1 . An information display device that displays image information as a virtual image on a projection surface, the device comprising:
inside a housing including an opening portion at a part of the housing,
an image display device configured to generate image light for displaying the image information that is S-polarized light;
a first optical element configured to perform a predetermined optical process on the image light from the image display device;
a concave surface mirror configured to project the image light from the first optical element on the projection surface through the opening portion of the housing such that a viewer can recognize the image information as the virtual image in front of the projection surface;
a second optical element including a reflective polarizing plate fixed to a substrate having a transmissive property with an adhesive agent or with a pressure-sensitive adhesive agent in a part of an optical path inside the housing, the second optical element selectively reflecting a P-polarized light component of light in a visible light region; and
a suppression material configured to suppress at least one of light rays in an infrared region and in an ultraviolet region in the optical path inside the housing.
2 . The information display device according to claim 1 ,
wherein the reflective polarizing plate selectively reflects the P-polarized light component of the light in the visible light region, and transmits an S-polarized light component with a specific transmittance, so that a degree of polarization of the image light from the image display device increases, and contrast performance is improved.
3 . The information display device according to claim 1 ,
wherein the image display device includes a solid-state light source configured to generate S-polarized light.
4 . The information display device according to claim 1 , wherein the second optical element further includes a moisture-proof film on a surface of the reflective polarizing plate.
5 . The information display device according to claim 4 ,
wherein the moisture-proof film has a film thickness of 130 nm to 145 nm.
6 . The information display device according to claim 4 , wherein the moisture-proof film on has a film thickness set to ¼ of a wavelength output by the image display device.
7 . The information display device according to claim 1 , wherein the suppression material is configured to reflect or absorb at least one of light rays in the infrared region and in the ultraviolet region.
8 . The information display device according to claim 7 , wherein the suppression material is on the concave surface mirror.
9 . The information display device according to claim 7 , wherein the suppression material is in the opening portion.
10 . The information display device according to claim 1 , wherein the second optical element is inclined with respect to an optical axis between the concave surface mirror and the projection surface.
11 . An information display device that displays image information as a virtual image on a projection surface, the device comprising:
inside a housing including an opening portion at a part of the housing,
an image display device configured to generate image light for displaying the image information;
a first optical element configured to perform a predetermined optical process on the image light from the image display device;
a concave surface mirror configured to project the image light from the first optical element on the projection surface through the opening portion of the housing such that a viewer can recognize the image information as the virtual image in front of the projection surface; and
a second optical element including a reflective polarizing plate is fixed to a substrate having a transmissive property with an adhesive agent or with a pressure-sensitive adhesive agent in an optical path inside the housing, wherein the substrate is made of transmissive resin that selectively reflects a P-polarized light component of light in a visible light region, and a shape of the substrate corrects aberrations of the virtual image.
12 . The information display device according to claim 11 ,
wherein the reflective polarizing plate selectively reflects the P-polarized light component of the light in the visible light region, and transmits an S-polarized light component with a specific transmittance, so that a degree of polarization of the image light from the image display device increases.
13 . The information display device according to claim 11 , wherein the second optical element is inclined with respect to an optical axis between the concave surface mirror and the projection surface.
14 . The information display device according to claim 11 , wherein the second optical element further includes a moisture-proof film on a surface of the reflective polarizing plate.
15 . The information display device according to claim 14 ,
wherein the moisture-proof film has a film thickness of 130 nm to 145 nm.
16 . The information display device according to claim 14 , wherein the moisture-proof film on has a film thickness set to ¼ of a wavelength output by the image display device.
17 . The information display device according to claim 11 , wherein the image display device configured to output S-polarized light.