Optical device and display apparatus

摘要

An optical device which is disposed between a light source section of a display apparatus and a projection target member, includes a first luminous flux diameter enlargement element in which a first light-transmissive layer and a first partially reflective layer are alternately laminated in a first direction, and a second luminous flux diameter enlargement element in which a second light-transmissive layer and a second partially reflective layer are alternately laminated in a second direction intersecting the first direction. The first partially reflective layer and the second partially reflective layer are formed from dielectric multilayered films that have the same film configuration. In addition, the optical device includes a retardation element that is formed from a ½λ retardation plate between a first emission surface of the first luminous flux diameter enlargement element and a second incidence surface of the second luminous flux diameter enlargement element.

主权项

1. An optical device comprising:
a first luminous flux diameter enlargement element that includes a plurality of first light-transmissive layers which is provided with a first surface and a second surface that is disposed so as to be parallel to the first surface, and a first partially reflective layer that includes a dielectric multilayered film; a second luminous flux diameter enlargement element that includes a plurality of second light-transmissive layers which is provided with a first surface and a second surface that is disposed so as to be parallel to the first surface, and a second partially reflective layer that includes a dielectric multilayered film; and a retardation element that is disposed between the first luminous flux diameter enlargement element and the second luminous flux diameter enlargement element, wherein the plurality of first light-transmissive layers is laminated along a first direction so that the respective first surfaces thereof are mutually parallel to one another, the first partially reflective layer is disposed between two adjacent first light-transmissive layers among the plurality of first light-transmissive layers, the first partially reflective layer is disposed so as to be parallel to the first surface of one first light-transmissive layer among the plurality of first light-transmissive layers, the plurality of second light-transmissive layers is laminated along a second direction so that the respective first surfaces thereof are mutually parallel to one another, the second partially reflective layer is disposed between two adjacent second light-transmissive layers among the plurality of second light-transmissive layers, the second partially reflective layer is disposed so as to be parallel to the first surface of one second light-transmissive layer among the plurality of second light-transmissive layers, and the first direction intersects the second direction.