US Patent 11402563 Optical device

With a simple configuration, an optical device which realizes uniform light distribution and adequate display quality is provided. An optical device includes: a light guiding layer; a first optically functional layer provided on at least one of a first principal face and a second principal face of the light guiding layer; and a ray control structure, at an end of the light guiding layer on a light-incident side, being provided on a surface of the first optically functional layer that is on an opposite side to the light guiding layer. The ray control structure reduces light which is incident from an edge of the light guiding layer to the first optically functional layer at an angle smaller than a critical angle.