Transmission-type transparent screen, image display system and image display method
To provide a transmission-type transparent screen which is excellent in the see-through property for a scene on the other side of the transparent screen as viewed from an observer in a state where no image-forming light is projected from a projector and which is excellent in visibility of an image displayed on the transparent screen as viewed from the observer in a state where image-forming light is projected from the projector, as well as an image display system and an image display method, employing the transparent screen. A transmission-type transparent screen 1 which has a first surface A and a second surface B on the opposite side thereof and which has a light scattering layer 34 comprising a transparent resin 32 and a light scattering material 33 , wherein the light scattering layer 34 further contains a light absorbing material, the haze is from 3 to 30%, the total light transmittance is from 15 to 95%, and the diffuse reflectance is from 0.1 to 2.4%.
1. A transmission-type transparent screen, comprising:
a first surface and a second surface on an opposite side thereof; and
a light scattering layer comprising a transparent resin and a light scattering material,
wherein the light scattering layer further comprises a light absorbing material,
and wherein the screen has a haze of from 3 to 30%, a total light transmittance of from 15 to 95%, and a diffuse reflectance of from 0.1 to 2.4%.
2. The transmission-type transparent screen according to claim wherein the haze is from 9 to 30%, and the total light transmittance is from 15 to 84%.
3. The transmission-type transparent screen according to claim 1 , wherein the proportion of the light absorbing material is from 0.01 to 5 mass % in 100 mass % of the light scattering layer.
4. The transmission-type transparent screen according to claim 1 , wherein the transmission-type transparent screen has a laminated structure comprising 1 or 2 layers of transparent substrate and said light scattering layer, and at least one of said first surface and said second surface is a surface of said transparent substrate.
5. A transmission-type transparent screen, comprising:
a first surface and a second surface on an opposite side thereof;
a light scattering layer comprising a transparent resin and a light scattering material; and
a light absorbing layer comprising a transparent material and a light absorbing material, on the second surface side than said light scattering layer,
wherein
a haze measured with respect to light entered from said first surface side and transmitted to said second surface side, is from 3 to 30%,
a total light transmittance measured with respect to light entered from said first surface side and transmitted to said second surface side, is from 15 to 95%, and
a diffuse reflectance measured with respect to light entered from said second surface side and reflected to said second surface side, is from 0.1 to 2.4%.
6. The transmission-type transparent screen according to claim 5 , wherein the haze is from 9 to 30%, and the total light transmittance is from 15 to 84%.
7. The transmission-type transparent screen according to claim 5 , wherein the transmission-type transparent screen has a laminated structure comprising 1 or 2 layers of transparent substrate, said light scattering layer and said light absorbing layer, and at least one of said first surface and said second surface is a surface of said transparent substrate.
8. The transmission-type transparent screen according to claim 1 , wherein an arithmetic mean roughness Ra at said first surface and said second surface is at most 0.3 μm.
9. The transmission-type transparent screen according to claim 1 , wherein a solubility parameter of said transparent resin is at least 18 (H/cm 3 ) 1/2 .
10. The transmission-type transparent screen according to claim 1 , wherein the light scattering material and the light absorbing material are fine particles, and the average primary particle size of the light absorbing material is smaller than the average primary particle size of the light scattering material.
11. The transmission-type transparent screen according to claim 1 , wherein an average primary particle size of the light scattering material is at most 1 μm, and the average primary particle size of the light absorbing material is at most 200 nm.
12. The transmission-type transparent screen according to claim 1 , wherein a ratio of the average primary particle size of the light absorbing material to the average primary particle size of the light scattering material is (average primary particle size of the light absorbing material)/(average primary particle size of the light scattering material) is from 0.001 to 0.99.
13. An image display system comprising the transmission-type transparent screen according to claim 1 , and a projector installed on the first surface side of the transmission-type transparent screen.
14. An image display method, comprising:
projecting image-forming light from a projector installed on the first surface side of the transmission-type transparent screen according to claim 1 , to the transmission-type transparent screen, to display an image.
15. A transparent film or sheet which has a light scattering layer made of a transparent resin comprising a light scattering material and an inorganic coloring material, or has a light scattering layer made of a transparent resin comprising a light scattering material, and a light absorbing layer made of a transparent resin comprising an inorganic coloring material, and which is to be laminated with a transparent substrate to form a transmission-type transparent screen.
16. The transparent film or sheet according to claim 15 , wherein the proportion of the inorganic coloring material is from 0.01 to 5 mass % in 100 mass % of the light scattering layer.
17. The transparent film or sheet according to claim 15 , wherein the inorganic coloring material is a member selected from the group consisting of carbon black and titanium oxide.