Phosphor-containing film and backlight unit
Provided is an organic electroluminescent display device that further suppresses reflection of external light when viewed in an oblique direction; a phase difference film; and a circularly polarizing plate. This display device has an organic electroluminescent display panel, and a circularly polarizing plate arranged on the display panel, in which the circularly polarizing plate has a polarizer and a phase difference film, the phase difference film has, from a side of the polarizer, a negative A-plate, and a positive A-plate, the in-plane retardation of the negative A-plate at a wavelength of 550 nm is more than 50 nm and less than 90 nm, and the in-plane retardation of the positive A-plate at a wavelength of 550 nm is 100 to 200 nm, and the angle formed by the in-plane slow axis of the negative A-plate and the in-plane slow axis of the positive A-plate is 45°±10°.
1. A phosphor-containing film comprising:
a phosphor-containing layer having a resin layer in which a plurality of discretely arranged concave portions are formed, and a fluorescent material filled in the concave portions formed in the resin layer; and
a first substrate film laminated on a main surface on a bottom side of the concave portions of the resin layer, and a second substrate film laminated on the other main surface of the resin layer,
wherein the fluorescent material contains a phosphor and a binder,
the concave portions of the resin layer do not pass completely through the resin layer,
the fluorescent material filled in the concave portions of the resin layer and the first substrate film are not in contact with each other,
at least a part of a wall portion forming the concave portions of the resin layer has a second substrate film-side end spaced apart from the second substrate film,
the fluorescent material is also present between the second substrate film and the second substrate film-side end of the wall portion spaced apart from the second substrate film, and
the wall portion is a region of the resin layer between the fluorescent material and the fluorescent material in a surface direction of the phosphor-containing layer and a region of the resin layer outside the outermost fluorescent material in the surface direction, and
at least one of the fluorescent material or the resin layer contains a light scattering particle.
2. The phosphor-containing film according to claim 1 , wherein a distance between the second substrate film and the second substrate film-side end of the wall portion spaced apart from the second substrate film is 0.01 to 10 μm.
3. The phosphor-containing film according to claim 1 , wherein the resin layer has impermeability to oxygen.
4. The phosphor-containing film according to claim 1 , wherein all of ends on the second substrate film side of the wall portion of the resin layer are spaced apart from the second substrate film.
5. The phosphor-containing film according to claim 1 , wherein the fluorescent material present between the second substrate film and the second substrate film-side end of the wall portion spaced apart from the second substrate film contains a material having impermeability to oxygen, in addition to the phosphor and the binder.
6. The phosphor-containing film according to claim 5 , further comprising: between the second substrate film and the second substrate film-side end of the wall portion spaced apart from the second substrate film,
a layer including the fluorescent material containing the material having impermeability to oxygen, in addition to the phosphor and the binder; and
a layer including the material having impermeability to oxygen and located closer to the second substrate film than the layer including the fluorescent material.
7. The phosphor-containing film according to claim 5 , wherein the material having impermeability to oxygen has the same components as a material for forming the resin layer and does not contain an inorganic layered compound.
8. A backlight unit comprising:
a wavelength converting member made of the phosphor-containing film according to claim 1 ; and
at least one of a blue light emitting diode or an ultraviolet light emitting diode.