公开(公告)号：US20230144703A1

公开(公告)日：2023-05-11

申请号：US17766277

申请日：2020-09-29

Applicant: Hitachi-LG Data Storage, Inc.

Inventor： Toshiteru NAKAMURA ,  Takuma KUNO ,  Ryuji UKAI ,  Takahiro MOURI ,  Masahito UCHIYAMA

IPC: G02B27/01 ,  G02B6/34 ,  F21V8/00

CPC classification number: G02B27/0172 ,  G02B6/34 ,  G02B6/0031 ,  G02B2027/0174

Abstract: A head-mounted display achieves both miniaturization and high efficiency of an optical system and expansion of an eye box. In order to achieve the above-described object, a head-mounted display that displays an image within a visual field of a user is provided. The head-mounted display includes: an image display unit that generates an image to be displayed; a projection unit that projects image light from the image display unit; an image rotation and replication unit that expands an eye box of projection light from the projection unit; and a waveguide unit that transmits image light from the image rotation and replication unit to a pupil of the user. The image rotation and replication unit includes an incidence surface, an emission surface, and at least two reflection surfaces, and an angle formed by the incidence surface and the emission surface is greater than 90°.

公开(公告)号：US20220317451A1

公开(公告)日：2022-10-06

申请号：US17691167

申请日：2022-03-10

Applicant: Hitachi-LG Data Storage, Inc.

Inventor： Kotaro OOISHI ,  Takahiro MOURI

IPC: G02B27/01 ,  G02B26/08 ,  G02B27/28 ,  G02B5/30 ,  F21V8/00

Abstract: An optical unit of a head-mounted display device includes: a light-emitting unit configured to condense light emitted from a light source; a display unit configured to generate image light by using the light condensed in the light-emitting unit as illumination light; a projection lens configured to project the image light transmitted from the display unit; an optical axis conversion element configured to displace an optical axis of the image light projected from the projection lens; and a light-guide plate configured to receive the image light of which the optical axis is displaced by the optical axis conversion element, and to guide the image light to a wearer's pupil.

公开(公告)号：US20220066215A1

公开(公告)日：2022-03-03

申请号：US17329320

申请日：2021-05-25

Applicant: Hitachi-LG Data Storage, Inc.

Inventor： Toshiteru NAKAMURA ,  Takuma KUNO ,  Takahiro MOURI

IPC: G02B27/01 ,  F21V8/00 ,  G06F3/01 ,  G06F3/16

Abstract: A head mounted display displays an image in a user's view field and includes a projection unit projecting image light from an image display unit; and a first and second light guide plates that duplicate the image light from the projection unit. The first and second light guide plates each include a set of parallel main surfaces confining the image light by internal reflection. The first light guide plate includes an incident surface reflecting the image light inward, and two or more emission reflective surfaces emitting the image light to the second light guide plate. The incident and emission reflective surfaces are parallel to each other at an angle different from the main surface, and the second light guide plate includes an input unit coupling the image light from the first light guide plate inward, and an output unit emitting the image light to the user's pupil.

公开(公告)号：US20210373424A1

公开(公告)日：2021-12-02

申请号：US17215251

申请日：2021-03-29

Applicant: Hitachi-LG Data Storage, Inc.

Inventor： Takahiro MOURI ,  Ryuji UKAI ,  Takuma KUNO ,  Toshiteru NAKAMURA

IPC: G03B21/20 ,  G02B3/00

Abstract: A virtual image projection device that generates image light includes a light source that emits light; a microlens array that emits the light, which is emitted from the light source, as light having a predetermined angle distribution; an imaging lens that concentrates the light from the microlens array; a display unit that is irradiated with the light, which is concentrated by the imaging lens, to generate an image; and a projection unit that projects the image, which is generated by the display unit, as image light. The microlens array is disposed such that short side directions of lens cells do not line up straight.

公开(公告)号：US20240151970A1

公开(公告)日：2024-05-09

申请号：US18039309

申请日：2021-12-27

Applicant: Hitachi-LG Data Storage, Inc.

Inventor： Toshiteru NAKAMURA ,  Takuma KUNO ,  Takahiro MOURI

IPC: G02B27/01

CPC classification number: G02B27/017 ,  G02B2027/0178

Abstract: A head mounted display displays an image in the user's field of vision and includes a video display unit that generates the image to be displayed. A first waveguide and a second waveguide duplicate the video light from the video display unit. Each of the waveguides includes a pair of parallel main planes that confine video light by internal reflection. The first waveguide includes an incident surface that reflects video light into the inside and two or more outgoing reflective surfaces emit video light into the second waveguide. The second waveguide includes an input unit that couples video light from the first waveguide to the inside and an output unit that emits video light to the user's pupil, wherein the angle between the duplication direction of video light in the first waveguide and the duplication direction of video light in the second waveguide is less than 90°.

公开(公告)号：US20220413204A1

公开(公告)日：2022-12-29

申请号：US17764623

申请日：2020-10-06

Applicant: HITACHI-LG DATA STORAGE, INC.

Inventor： Ryuji UKAI ,  Takahiro MOURI ,  Takeru UTSUGI ,  Toshiteru NAKAMURA ,  Takuma KUNO ,  Masahito UCHIYAMA

IPC: F21V8/00 ,  G02B27/01 ,  H04N9/31

Abstract: According to the invention, a light guide plate-type video display device and a video display system that are capable of displaying a video with less color deviation and less video distortion are provided. A video display device 101 configured to display a video includes a video projection unit 200 configured to project video light, a video deflection unit 210, and a light guide portion 230. The video deflection unit 210 deflects video light emitted by the video projection unit 200 and causes the video light to propagate to the light guide portion 230, and the light guide portion 230 causes the entered video light to propagate therein and outputs the video light. Here, the video deflection unit 210 or the light guide portion 230 is configured to reduce color dispersion of the video light outputted from the light guide portion 230.

公开(公告)号：US20210063743A1

公开(公告)日：2021-03-04

申请号：US16850254

申请日：2020-04-16

Applicant: Hitachi-LG Data Storage, Inc.

Inventor： Takuma KUNO ,  Ryuji UKAI ,  Toshiteru NAKAMURA ,  Masahito UCHIYAMA ,  Takahiro MOURI

IPC: G02B27/01 ,  F21V8/00

Abstract: An image display device projecting an image to a user includes: an image generation unit that generates image light; a projection optical unit that projects the image light generated by the image generation unit; an image light duplication unit that duplicates and emits the image light projected by the projection optical unit; and a light-guiding unit that projects the image light duplicated by the image light duplication unit to a user, in which the projection optical unit includes at least one projection lens, and in which an interval at which the image light duplication unit duplicates the image light is smaller than an outer diameter of the projection lens.