Curved back-projection screen

Abstract

A curved back-projection screen having an angle of curvature greater than 180°, such as a wrap-around cylindrical or dome screen. The screen includes a first layer and a second synthetic resin diffusing layer on the first layer, the second synthetic resin diffusing layer containing a light absorbing material and light diffusing particles embedded in a resin material, with the second synthetic resin diffusing layer having a value of the product of the absorption coefficient and thickness of between 0.1 and 2. The second synthetic resin diffusing layer can be applied by spraying.

1 - 18 . (canceled) 
     
     
         19 . A curved back-projection screen having an angle of curvature greater than 180°, the screen comprising a first layer and a second diffusing layer on the first layer, the second synthetic diffusing layer containing a light absorbing material and light diffusing particles, the second synthetic resin diffusing layer being a sprayed-on layer on an inside surface of the first layer. 
     
     
         20 . The curved back-projection screen according to  claim 19 , the second synthetic resin diffusing layer having a uniform thickness. 
     
     
         21 . The curved back-projection screen according to  claim 19 , wherein the second diffusing layer comprises multiple layers. 
     
     
         22 . The curved back-projection screen according to  claim 19 , wherein the second diffusing layer comprises a mix of diffusing layers and light absorbing layers. 
     
     
         23 . The curved back-projection screen according to  claim 22 , wherein the second diffusing layer comprises alternating diffusing layers and light absorbing layers. 
     
     
         24 . The curved back-projection screen according to  claim 19 , wherein the first layer is a synthetic resin layer or is made of glass. 
     
     
         25 . The curved back-projection screen according to  claim 19 , wherein the light diffusing particles are embedded in a resin material. 
     
     
         26 . The curved back-projection screen according to  claim 19 , wherein the gain for backscattering (Gr) has a value Gr<0.1 for an angle >40°. 
     
     
         27 . The curved back-projection screen according to  claim 26 , wherein the value of Gr<0.07. 
     
     
         28 . A method of making a curved back-projection screen, the curved back-projection screen having an angle of curvature greater than 180° and comprising a first layer and a second synthetic resin diffusing layer on the first layer, the second synthetic resin diffusing layer containing a light absorbing material and light diffusing particles, the method comprising spraying the second synthetic resin diffusing layer onto in an inside surface of the first layer. 
     
     
         29 . The method according to  claim 28  comprising spraying the second synthetic resin diffusing layer having a uniform thickness onto in an inside surface of the first layer. 
     
     
         30 . The method according to  claim 28 , wherein the second synthetic resin diffusing layer is applied multiple layers. 
     
     
         31 . The method according to  claim 28 , wherein the second diffusing layer is applied with a mix of diffusing layers and light absorbing layers. 
     
     
         32 . The method according to  claim 31 , wherein the second diffusing layer is applied with alternating diffusing layers and light absorbing layers. 
     
     
         33 . The method according to  claim 28 , wherein the first layer is made of a synthetic resin or is made of glass. 
     
     
         34 . The method according to  claim 28 , further comprising embedding the light diffusing particles in a resin material. 
     
     
         35 . The method according to  claim 28 , wherein the gain for backscattering (Gr) has a value Gr<0.1 for an angle >40°. 
     
     
         36 . The method according to  claim 35 , wherein the value of Gr<0.07. 
     
     
         37 . A display or a simulator having a curved back-projection screen, the curved back-projection screen having an angle of curvature greater than 180°, the curved back-projection screen comprising a first layer and a second diffusing layer on the first layer, the second diffusing layer containing a light absorbing material and light diffusing particles; and at least one projector configured for back-projecting an image onto the first layer wherein light of the image exits the second diffusing layer towards a viewer. 
     
     
         38 . A method of displaying an image onto a curved back-projection screen having an angle of curvature greater than 180° by back projection, the screen comprising a first layer and a second diffusing layer on the first layer, the second diffusing layer containing a light absorbing material and light diffusing particles; the method comprising:
 projecting the image with at least one projector, and arranging the projector so that the image is projected onto the first layer and light of the image exits the second diffusing layer towards a viewer.