US 12,085,728 B2
Optical device and electronic device
Takeya Hirose, Kanagawa (JP); Ryo Hatsumi, Kanagawa (JP); Hisao Ikeda, Kanagawa (JP); Daiki Nakamura, Kanagawa (JP); and Yosuke Tsukamoto, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., Atsugi (JP)
Filed by SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Atsugi (JP)
Filed on Mar. 13, 2023, as Appl. No. 18/182,604.
Claims priority of application No. 2022-043298 (JP), filed on Mar. 18, 2022.
Prior Publication US 2023/0296910 A1, Sep. 21, 2023
Int. Cl. G02B 27/28 (2006.01); G02B 27/14 (2006.01)
CPC G02B 27/286 (2013.01) [G02B 27/144 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An optical device comprising:
a half mirror;
a first lens;
a retardation plate;
a reflective polarizing plate; and
a second lens,
wherein the half mirror, the first lens, the retardation plate, the reflective polarizing plate, and the second lens are placed in this order to have an overlapping region,
wherein the half mirror and the first lens are placed to be apart from each other,
wherein the first lens and the retardation plate are placed to be close to each other,
wherein the first lens is a geometric phase lens,
wherein the first lens has negative refractive power with respect to circularly polarized light that passes through the half mirror and enters the first lens, and
wherein a convex surface of the second lens faces an eye of a user.