Light absorbing body-containing film and backlight unit

Abstract

Provided are a backlight unit and a light absorbing material-containing film which contains quantum dots or the like and is capable of suppressing in-plane luminance unevenness and chromaticity unevenness; and a backlight unit. The light absorbing material-containing film includes a light absorbing material-containing layer with a resin layer in which one or more concave portions discretely disposed are formed and a plurality of light absorption regions containing light absorbing bodies and disposed in the concave portions formed in the resin layer; a first substrate film laminated on one main surface of the light absorbing material-containing layer; and a second substrate film laminated on the other main surface of the light absorbing material-containing layer, where the light absorption region contains at least one phosphor that serves as the light absorbing body, and a binder.

What is claimed is: 
     
         1 . A light absorbing material-containing film comprising:
 a light absorbing material-containing layer that has a resin layer in which one or a plurality of concave portions discretely disposed are formed and a plurality of light absorption regions which contain light absorbing bodies and are disposed in the concave portions formed in the resin layer;   a first substrate film that is laminated on one main surface of the light absorbing material-containing layer; and   a second substrate film that is laminated on the other main surface of the light absorbing material-containing layer,   wherein the light absorption region contains at least one phosphor that serves as the light absorbing body, and a binder,   the resin layer has a modulus of elasticity of 0.5 to 10 GPa, and   an in-plane tint distribution of the light absorbing material-containing film satisfies Formula (1),
   0.002≤ y   max-   y   min <0.2  Formula (1)
 
   in the formula, y max  and y min  respectively represent a maximum value and a minimum value of a CIE y value in a measurement of an in-plane tint of the light absorbing material-containing film.   
     
     
         2 . The light absorbing material-containing film according to  claim 1 , wherein a thickness of the light absorption region has an in-plane distribution. 
     
     
         3 . The light absorbing material-containing film according to  claim 2 , wherein the thickness of the light absorption region is thicker at a peripheral portion than at a center in a plane direction. 
     
     
         4 . The light absorbing material-containing film according to  claim 1 , wherein an area of the light absorption region with respect to a total area of the light absorption region and the resin layer surrounding the light absorption region has an in-plane distribution. 
     
     
         5 . The light absorbing material-containing film according to  claim 4 , wherein the area of the light absorption region with respect to the total area of the light absorption region and the resin layer surrounding the light absorption region is larger in the peripheral portion than in the center in the plane direction. 
     
     
         6 . The light absorbing material-containing film according to  claim 1 , wherein the light absorbing material-containing layer contains two or more different types of phosphors or coloring agents as light absorbing bodies. 
     
     
         7 . The light absorbing material-containing film according to  claim 1 , wherein the resin layer has an oxygen permeability of 10 cc/(m 2 ·day·atm) or less. 
     
     
         8 . A light absorbing material-containing film comprising:
 a first substrate film and a second substrate film, which are disposed to be spaced from each other such that main surfaces thereof face each other;   a light absorption region which is provided between the first substrate film and the second substrate film and contains a first light absorbing body; and   a frame which is provided so as to surround the light absorption region between the first substrate film and the second substrate film and contains a second light absorbing body different from the first light absorbing body,   wherein the frame has an oxygen permeability of 20 cc/(m 2 ·day·atm) or less.   
     
     
         9 . The light absorbing material-containing film according to  claim 8 , which has a region where the thickness of the light absorption region continuously changes at a position where the frame and the light absorption region are in contact with each other in a case of observing a cross section in a thickness direction of the light absorbing material-containing film. 
     
     
         10 . The light absorbing material-containing film according to  claim 8 , wherein the second light absorbing body absorbs at least one of ultraviolet light or blue light to emit yellow light. 
     
     
         11 . The light absorbing material-containing film according to  claim 8 , wherein the first light absorbing body is a quantum dot. 
     
     
         12 . The light absorbing material-containing film according to  claim 8 , wherein multiple frames are provided so that a plurality of frames having different sizes are provided and a large frame encloses a small frame. 
     
     
         13 . The light absorbing material-containing film according to  claim 12 , wherein the light absorption region is also provided between a plurality of multiple frames provided. 
     
     
         14 . The light absorbing material-containing film according to  claim 12 , wherein at least one of an absorbance or an amount of luminescence of the second light absorbing body contained in the frame gradually decreases from a larger frame to a smaller frame. 
     
     
         15 . The light absorbing material-containing film according to  claim 8 , wherein the frame has a width of 0.1 to 5 mm. 
     
     
         16 . A backlight unit comprising:
 a wavelength conversion member including the light absorbing material-containing film according to  claim 1 ; and   at feast one of a blue light-emitting diode or an ultraviolet light-emitting diode.   
     
     
         17 . A backlight unit comprising:
 a wavelength conversion member including the light absorbing material-containing film according to  claim 8 ; and   at least one of a blue light-emitting diode or an ultraviolet light-emitting diode.