Display device

Abstract

A display device includes a reflective image display unit having a sheet-like anisotropic scattering member. The sheet-like anisotropic scattering member has a surface in which both a low refractive index area and a high refractive index area exist. The sheet-like anisotropic scattering member is disposed so that a light enters from a first surface thereof and exits as scattered light from a second surface thereof, when an extent of refractive index difference at a boundary or vicinity thereof between the low refractive index area and the high refractive index area is relatively large in the first surface and relatively small in the second surface.

The invention is claimed as follows: 
     
         1 . An anisotropic scattering member formed into a sheet-like shape, comprising:
 a light incident surface; and   a light emitting surface,   wherein each of the light incident surface and the light emitting surface includes a low refractive index area and a high refractive index area,   wherein each of the low refractive index area and the high refractive index area extends in a thickness direction from the light incident surface to the light emitting surface,   wherein the anisotropic scattering member satisfies
 T(α)<10%, and 
 −10 degrees≦α≦30 degrees, 
   wherein α represents an angle between a normal direction of the light incident surface and an incident direction of light entering the light incident surface, and T(α) represents a transmittance at a position on an extension line of the incident direction with an incident angle (α).   
     
     
         2 . The anisotropic scattering member according  claim 1 , wherein T(α) is less than 8% when a range of α is −10 degrees≦α≦10 degrees. 
     
     
         3 . The anisotropic scattering member according  claim 1 , wherein T(α) is more than 40% when a range of α is α<−20 degrees. 
     
     
         4 . The anisotropic scattering member according  claim 1 , wherein T(α) is more than 10% when a range of α is 40 degrees<α. 
     
     
         5 . The anisotropic scattering member according  claim 1 , wherein T(α) is more than 60% when a range of α is α<−30 degrees. 
     
     
         6 . The anisotropic scattering member according  claim 1 , wherein T(α) is more than 60% when a range of α is 50 degrees<α. 
     
     
         7 . A display device comprising:
 an anisotropic scattering member according to  claim 1 ; and   an image display unit including a reflecting electrode that reflects an external light,   wherein the anisotropic scattering member is provided on the image display unit in a state that the reflecting electrode is opposed to the light incident surface of the anisotropic scattering member.