Display device
According to one embodiment, a display device includes a display element including a display portion which displays an image, a first retardation film overlapping the display element, a holographic optical element adjacent to the display element and not overlapping the display portion, a second retardation film having a first surface which faces the first retardation film and the holographic optical element and which directly contacts neither a main surface of the first retardation film nor a main surface of the holographic optical element, and a second surface on an opposite side to the first surface, and a reflective polarizer disposed on the second surface.
1 . A display device comprising:
a display element comprising a display portion which displays an image;
a first retardation film overlapping the display element;
a holographic optical element adjacent to the display element and not overlapping the display portion;
a second retardation film having a first surface and a second surface on an opposite side to the first surface, the first surface facing the first retardation film and the holographic optical element and directly contacting neither a main surface of the first retardation film nor a main surface of the holographic optical element; and
a reflective polarizer disposed on the second surface, wherein
the first surface faces the first retardation film and the holographic optical element with an air layer interposed between the first surface and the first retardation film and between the first surface and the holographic optical element.
2 . The display device of claim 1 , wherein
the display element is configured to emit display light of linearly polarized light,
the first retardation film and the second retardation film are quarter-wave plates, and
the reflective polarizer is configured to reflect first linearly polarized light and to transmit second linearly polarized light different from the first linearly polarized light.
3 . The display device of claim 1 , wherein
the holographic optical element has a lens action and is configured to reflect light reflected by the reflective polarizer toward the reflective polarizer.
4 . The display device of claim 3 , further comprising a light blocking member disposed on a back surface side of the holographic optical element.
5 . The display device of claim 3 , wherein
the holographic optical element is configured to transmit ambient light.
6 . The display device of claim 1 , wherein
the display element comprises an illumination device, a liquid crystal panel disposed between the illumination device and the first retardation film, a first polarizer disposed between the illumination device and the liquid crystal panel, and a second polarizer disposed between the liquid crystal panel and the first retardation film.
7 . The display device of claim 6 , wherein
the illumination device comprises a light guide and a light source facing a side surface of the light guide, and
the liquid crystal panel is located between the light source and the holographic optical element in a direction in which the display element and the holographic optical element are arranged.
8 . The display device of claim 1 , wherein
the first retardation film, the second retardation film, and the holographic optical element are covered with anti-reflective layers.
9 . The display device of claim 1 , wherein
a width of the display portion is equal to a width of the holographic optical element in a direction in which the display element and the holographic optical element are arranged.
10 . The display device of claim 1 , wherein
a normal of the holographic optical element is parallel to a normal of the reflective polarizer, and
a normal of the display element is inclined with respect to the normal of the reflective polarizer.