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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
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°.
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公开(公告)号：US20230083745A1
公开(公告)日：2023-03-16
申请号：US17863552
申请日：2022-07-13
Applicant: Hitachi-LG Data Storage, Inc.
Inventor： Takuma KUNO , Toshiteru NAKAMURA
Abstract: The head-mounted display includes: an image display unit that generates an image to be displayed; and a first light guide plate and a second light guide plate which duplicate image light from the image display unit. Each of the first light guide plate and the second light guide plate includes a set of parallel main surfaces confining the image light with internal reflection, the first light guide plate includes an incident plane that reflects the image light to an inner side, and two or more emission/reflection planes from which the image light is emitted to the second light guide plate, the second light guide plate includes an input part that couples the image light transmitted from the first light guide plate to the inner side, and an output part from which the image light is emitted to a user’s pupil.
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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
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.
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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
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.
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Patent Agency Ranking
公开(公告)号：US20210364802A1
公开(公告)日：2021-11-25
申请号：US17233886
申请日：2021-04-19
Applicant: Hitachi-LG Data Storage, Inc.
Inventor： Masahito UCHIYAMA , Toshiteru NAKAMURA , Takuma KUNO , Ryuichiro MIZUNO , Kazuhiko KUZUMAKI
Abstract: An objective of the present disclosure is to provide an image display device capable of suppressing stray light and outputting a high-quality video. An image display device according to the present disclosure comprises a protective cover covering a periphery of a light guide, wherein the protective cover comprises a concave lens and a convex lens, wherein the concave lens and the light guide are disposed at intervals of 4 mm or less, and wherein the convex lens and the light guide are disposed at intervals of 5 mm or less.
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公开(公告)号：US20200233217A1
公开(公告)日：2020-07-23
申请号：US16571499
申请日：2019-09-16
Applicant: Hitachi-LG Data Storage, Inc.
Inventor： Takuma KUNO , Ryuji UKAI , Toshiteru NAKAMURA , Satoshi OUCHI
Abstract: A light guide plate includes: first and second internal reflective surfaces that are approximately parallel and propagate incoming image light while totally reflecting the image light; a partially reflective surface array that has a plurality of partially reflective surfaces arranged in a direction of propagating image light, the partially reflective surfaces being inclined at a predetermined angle and partially reflecting the image light; and a uniforming element that uniforms intensity distribution of image light which is reflected by the partially reflective surface array to be projected from the light guide plate. As the uniforming element, the partially reflective surface array is divided into a plurality of segments along a direction of propagating image light, and the inter-surface spacing of the partially reflective surfaces or the reflectivity of the partially reflective surfaces is configured to vary from segment to segment.
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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°.
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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
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.
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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
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.
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