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OPTICAL SEE-THROUGH DISPLAY UPDATE_EN meetings

Foreign code F200010217
File No. 18T176P,(S2019-0292-N0)
Posted date Sep 15, 2020
Country WIPO
International application number 2020JP009389
International publication number WO 2020189302
Date of international filing Mar 5, 2020
Date of international publication Sep 24, 2020
Priority data
  • P2019-050960 (Mar 19, 2019) JP
Title OPTICAL SEE-THROUGH DISPLAY UPDATE_EN meetings
Abstract This optical see-through display 100 comprises a video-capture unit 110 and an optical shielding portion 120. The video-capture unit 110 includes a micro-display 112 which displays virtual video, and can control the depth position of the virtual video. The optical shielding portion 120 comprises: a relay lens optical system 122; a spatial light modulator (SLM) 124 positioned within the relay lens optical system 122, and an actuator 126 which shifts the spatial light modulator 124 in the axial direction of the relay lens optical system 122 in response to the depth position of the virtual video.
Outline of related art and contending technology BACKGROUND ART
In recent years, expectation for augmented reality (Augmented Reality , AR) has been increasing, and development of a head-mounted display (HMD: Head Mount Display), which is a key device for the augmented reality (Augmented Reality , AR), has been progressed. The HMD can superimpose and display the image and information of the virtual world (extended world) on the background of the real world.
HMD is largely divided into a video see-through type (VST: Video-see Through) type and an optical see-through type (OST: Optical-see Through) type. In the VST type, a video image of the real world is converted into digital image data by a camera, image data of the virtual world is synthesized by signal processing, and displayed on a display.
In the OST type, the image of the real world is optically synthesized while presenting the image of the real world to the user as it is. Fig. 1 (a) is a diagram showing the principle of conventional OST-HMD. OST-HMD2 includes a micro display 4 for presenting an image of the virtual world, and an optical system 6 for superimposing background light S1 of the real world on light S2 of the micro display 4. In the example of Fig. 1 (a), the optical system 6 is a half mirror.
In OST-HMD of Fig. 1 (a), since the virtual image displayed by the micro display 4 is translucent, there is a problem of lack of reality and reality. In order to solve this problem, OST-HMD is proposed which realizes optical shielding (Optical Occlusion) for shielding light in the real environment of the field of view. Fig. 1 (b) is a diagram showing OST-HMD3 with an optical shield.
In this OST-HMD3, the spatial light modulator (SLM) 8 for optical shielding is inserted into the see-through path. Reference numeral SLM8 denotes an optical mask. The SLM8 and the microdisplay 4 are arranged so that a distance between the pupil and SLM is optically equal to a distance between the pupil and the microdisplay.
(Non-Patent Document 1) proposes OST-HMD capable of changing the depth (focal length) of the virtual image. In) referred to as a variable focus type OST-HMD, the optical system 6 in OST-HMD2 of Fig. 1 (a) is constituted by a deformable beam splitter. By changing the curvature of the beam splitter, the position of the virtual image of the virtual image displayed on the microdisplay can be moved in the depth direction.
Scope of claims (In Japanese)[請求項1]
 仮想映像を表示するマイクロディスプレイを含み、前記仮想映像の奥行き位置が制御可能な映像投影部と、
 リレーレンズ光学系と、前記リレーレンズ光学系内に配置された空間光変調器と、前記仮想映像の奥行き位置と連動して、前記空間光変調器が生成する光学遮蔽マスクを前記リレーレンズ光学系の光軸上でシフトさせることで、前記光学遮蔽マスクの位置を前記仮想映像の焦点位置に略合わせる機構と、を含む光学遮蔽部と、
 を備えることを特徴とする光学式シースルー型ディスプレイ。

[請求項2]
 前記リレーレンズ光学系は、
 焦点距離fを有する第1レンズと、
 前記第1レンズからの距離が2fであり、焦点距離がf/2である第2レンズと、
 前記第2レンズからの距離が2fであり、焦点距離がfである第3レンズと、
 を含むことを特徴とする請求項1に記載の光学式シースルー型ディスプレイ。

[請求項3]
 前記空間光変調器は、前記第1レンズと前記第2レンズの間に挿入されることを特徴とする請求項2に記載の光学式シースルー型ディスプレイ。

[請求項4]
 前記第1レンズ、前記第2レンズ、前記第3レンズの少なくともひとつは、複数のレンズの合成レンズであることを特徴とする請求項3に記載の光学式シースルー型ディスプレイ。

[請求項5]
 前記リレーレンズ光学系の前段および後段に設けられた導光板のペアをさらに備えることを特徴とする請求項1から4のいずれかに記載の光学式シースルー型ディスプレイ。

[請求項6]
 前記機構は、前記空間光変調器を前記リレーレンズ光学系の光軸方向にシフトさせるアクチュエータを含むことを特徴とする請求項1から5のいずれかに記載の光学式シースルー型ディスプレイ。
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • TOKYO INSTITUTE OF TECHNOLOGY
  • Inventor
  • ITOH Yuta
  • HAMASAKI Takumi
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN WS ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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