Optical film and viewing angle control system

An optical film comprising:

• a plurality of light absorption anisotropic layers containing a dichroic substance;
• and
• at least one interlayer disposed between the plurality of light absorption anisotropic layers,
• wherein all of the plurality of light absorption anisotropic layers have an absorption axis parallel to a thickness direction,
• thicknesses of the plurality of light absorption anisotropic layers are all 3.0 μm or less,
• a total thickness of the plurality of light absorption anisotropic layers is 4.0 μm or more,
• with regard to the plurality of light absorption anisotropic layers, a total value calculated by multiplying a ratio of a content of the dichroic substance with respect to a mass of the light absorption anisotropic layer by the thickness of the light absorption anisotropic layer is 1.10 μm or more, and
• the interlayer is a layer in which an in-plane retardation at a wavelength of 550 nm is 25 nm or less and an absolute value of a thickness-direction retardation at the wavelength of 550 nm is 25 nm or less.