US 12,298,507 B2
Display device and optical unit
Mitsutaka Ide, Shiojiri (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Nov. 29, 2021, as Appl. No. 17/537,368.
Claims priority of application No. 2020-198038 (JP), filed on Nov. 30, 2020.
Prior Publication US 2022/0171196 A1, Jun. 2, 2022
Int. Cl. G02B 27/01 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 2027/011 (2013.01); G02B 2027/0145 (2013.01); G02B 2027/0178 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A display device comprising:
an image element that emits an image light;
a projection lens that transmits the image light from the image element;
a prism that includes:
a light incident surface in which the image light from the projection lens is incident,
a light emission surface emitting the image light, and
a reflecting surface reflecting the image light from the light incident surface toward the light emission surface; and
a mirror that reflects a part of the image light from the prism toward a pupil position and that transmits other part of the image light,
wherein
an intermediate image is formed between the reflection surface and the mirror, and
the light emission surface has a first region and a second region that is higher a refractive power than the first region, wherein an inflection point is provided between the first region and the second region.