US 12,147,048 B2
Virtual image display device
Takashi Takeda, Suwa (JP); and Atsushi Saito, Chino (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Oct. 25, 2023, as Appl. No. 18/494,758.
Claims priority of application No. 2022-173085 (JP), filed on Oct. 28, 2022.
Prior Publication US 2024/0142780 A1, May 2, 2024
Int. Cl. G02B 27/01 (2006.01); G02B 27/09 (2006.01); G02B 27/28 (2006.01); G02F 1/29 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 27/0179 (2013.01); G02B 27/0955 (2013.01); G02B 27/283 (2013.01); G02F 1/294 (2021.01); G02B 2027/0185 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A virtual image display device, comprising:
a first image display device configured to display a virtual image;
a second image display device configured to display a virtual image;
a line-of-sight direction distance detection device configured to detect an object distance in a line-of-sight direction of a wearer;
an image display control unit configured to control display states of the first image display device and the second image display device in accordance with the object distance; and
a liquid crystal lens configured to be disposed in front of eyes of the wearer and configured to have a focal length changing with respect to a polarization component of image light emitted from the first image display device and the second image display device, wherein
the first image display device and the second image display device each include a display element, a projection optical system, and a combiner, and
the liquid crystal lens transmits, without a lens effect, outside light that passed the combiner,
the combiner includes a polarizing beam splitter and transmits outside light that is p-polarized light, and
the liquid crystal lens gives a phase difference to the image light that is s-polarized light to adjust an imaging state, and does not give a phase difference to the p-polarized light.