Transparent screen sheet, transparent screen, and image display system
A transparent screen sheet that displays images projected from a front side of the transparent screen sheet and/or a rear side of the transparent screen sheet to a user on the front side, and causes the user on the front side to view a rear background behind the rear side. The transparent screen sheet includes an image display layer configured to display the images; and a resin film that holds the image display layer. A difference between a maximum value and a minimum value of retardations of the resin film measured by irradiating a main surface of the resin film with a light with a wavelength of 460 nm in a direction orthogonal to the main surface, within a region on the main surface that overlaps with the image display layer, is one fourth of the wavelength of the light or less.
1. A transparent screen sheet that displays images projected from a front side of the transparent screen sheet to a user on the front side of the transparent screen sheet, and causes the user on the front side of the transparent screen sheet to view a rear background behind the rear side of the transparent screen sheet, the transparent screen sheet comprising:
an image display layer configured to display the images; and
a resin film that holds the image display layer,
wherein a difference between a maximum value and a minimum value of retardations of the resin film measured by irradiating a main surface of the resin film with a light having a wavelength of 460 nm in a direction orthogonal to the main surface, within a region on the main surface of the resin film that overlaps with the image display layer, is less than or equal to one fourth of the wavelength of the light,
wherein the image display layer comprises a light transmission diffusion reflection layer configured to diffuse and reflect to the front side a light of the images projected from the front side, to display the images to the user on the front side, and wherein the resin film is arranged on both sides of the image display layer, the image display layer being interposed between resin films.
2. The transparent screen sheet according to claim 1 , wherein at any position in the region on the main surface of the resin film that overlaps with the image display layer, the retardation of the resin film is one-fourth of the wavelength of the light or less.
3. The transparent screen sheet according to claim 1 , wherein at a desired position in the region on the main surface of the resin film that overlaps with the image display layer, the retardation of the resin film is one-eighth of the wavelength of the light or less.
4. The transparent screen sheet according to claim 1 , wherein at a desired position in the region on the main surface of the resin film that overlaps with the image display layer, the retardation of the resin film is one-sixteenth of the wavelength of the light or less.
5. The transparent screen sheet according to claim 1 , wherein the resin film comprises at least one of a cycloolefin polymer and cycloolefin copolymer.
6. A transparent screen comprising:
the transparent screen sheet according to claim 1 ; and
a transparent plate that holds the transparent screen sheet.
7. An image display system comprising:
the transparent screen according to claim 6 ; and
a projector configured to project images onto the transparent screen,
wherein a light of the images projected from the projector is a polarized light.
8. The image display system according to claim 7 , wherein the projector is a short focal length projector.
9. The transparent screen sheet according to claim 1 , wherein the image display layer comprises the light transmission diffusion reflection layer, and wherein the light transmission diffusion reflection layer is formed on a surface of the resin film.
10. A transparent screen sheet that displays images projected from a front side of the transparent screen sheet to a user on the front side of the transparent screen sheet, and causes the user on the front side of the transparent screen sheet to view a rear background behind the rear side of the transparent screen sheet, the transparent screen sheet comprising:
an image display layer configured to display the images; and
a resin film that holds the image display layer,
wherein a difference between a maximum value and a minimum value of retardations of the resin film measured by irradiating a main surface of the resin film with a light having a wavelength of 460 nm in a direction orthogonal to the main surface, within a region on the main surface of the resin film that overlaps with the image display layer, is less than or equal to one fourth of the wavelength of the light,
wherein the image display layer comprises a light transmission diffusion reflection layer configured to diffuse and reflect to the front side a light of the images projected from the front side, to display the images to the user on the front side, and
wherein the image display layer comprises an irregular layer, the light transmission diffusion reflection layer, and a coating layer, in this order.