WO1999031658A1 - Systeme capteur optique integre s'utilisant avec des disques optiques d'epaisseurs differentes - Google Patents

Systeme capteur optique integre s'utilisant avec des disques optiques d'epaisseurs differentes Download PDF

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Publication number
WO1999031658A1
WO1999031658A1 PCT/KR1998/000420 KR9800420W WO9931658A1 WO 1999031658 A1 WO1999031658 A1 WO 1999031658A1 KR 9800420 W KR9800420 W KR 9800420W WO 9931658 A1 WO9931658 A1 WO 9931658A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
light beam
pickup system
optical pickup
linearly polarized
Prior art date
Application number
PCT/KR1998/000420
Other languages
English (en)
Inventor
Yang Oh Choi
Original Assignee
Daewoo Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1019970069042A external-priority patent/KR19990050020A/ko
Priority claimed from KR1019970069020A external-priority patent/KR19990049998A/ko
Application filed by Daewoo Electronics Co., Ltd. filed Critical Daewoo Electronics Co., Ltd.
Publication of WO1999031658A1 publication Critical patent/WO1999031658A1/fr

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • G11B7/1369—Active plates, e.g. liquid crystal panels or electrostrictive elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/12004—Combinations of two or more optical elements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/123—Integrated head arrangements, e.g. with source and detectors mounted on the same substrate
    • G11B7/124—Integrated head arrangements, e.g. with source and detectors mounted on the same substrate the integrated head arrangements including waveguides
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B2007/13727—Compound lenses, i.e. two or more lenses co-operating to perform a function, e.g. compound objective lens including a solid immersion lens, positive and negative lenses either bonded together or with adjustable spacing

Definitions

  • the present invention relates to an integrated optical pickup system; and, more particularly, to an optical pickup system incorporating therein an optical device including a liquid crystal for reading a thin and a thick optical disks.
  • a short wavelength light source and a large numerical aperture (NA) are essential in optical pickup heads for realizing the reproduction of data from a high density optical storage medium. Therefore, a large NA, e.g., 0.6, lens is preferably employed in an optical head for use with a high density DVD(digital video disk) having a thickness of, e.g., 0.6mm.
  • a large NA e.g., 0.6
  • the spherical aberration caused by the difference in the thickness of the optical disk must be corrected.
  • One of the optical heads introduced to solve the problem is a dual focus optical head with a holographic optical element (HOE) shown in Fig. 1.
  • HOE holographic optical element
  • the dual focus optical head 100 comprises: a light source 126 for generating a light beam, a beam splitter 106, a collimate lens 108, a HOE 110, an objective lens 112, a cylindrical lens 104 and a detector 102 provided with four photoelectric cells.
  • a light beam from the collimate lens 108 is split into a 0th order and a 1st order diffracted light beam by the HOE 110, which are then focused by the objective lens 112, wherein the focal length of the 1st order diffracted light beam 128 is greater than that of the 0th order diffracted light beam 124.
  • the 0th order diffracted light beam 124 is utilized for reproducing the information signal off a recording surface 118 of a thin optical disk 116.
  • the light beam emitted from the light source 126 e.g., a laser diode, enters the HOE 110 via the beam splitter 106 and the collimate lens 108, wherein the beam splitter 106 partially reflects the light beam by a surface incorporated therein and the collimate lens 108 makes the light beam from the beam splitter 106 parallel.
  • the 0th order diffracted light beam 124 is focused onto the recording surface 118 of the thin optical disk 116 by the objective lens 112.
  • the HOE 110 simply plays the role of a parallel plate for the 0th order diffracted light beam 124 of the parallel light beam.
  • the HOE 110 also plays the role of a parallel plate.
  • the reflected 0th order diffracted light beam 124 after passing through the collimate lens 108 and the beam splitter 106, becomes astigmatic after passing through the cylindrical lens 104, thereby allowing the detector 102 to read the information signal off the recording surface 118 of the thin optical disk 116.
  • the 1st order diffracted light beam 128 transmitted through the HOE 110 is used.
  • the HOE 110 in combination with the objective lens 112, functions as a lens for focusing the 1st order diffracted light beam 128 onto the recording surface 120 of the thick optical disk 122. Therefore, the optical head 100 for use with the thin optical disk 116 is also capable of reproducing the information signal off the recording surface 120 of the thick optical disk 122.
  • optical head 100 One of the major shortcomings associated with the above-described optical head 100 is that the optical head
  • an optical pickup system for reading an information signal off an optical disk, the system comprising: a substrate having a top surface and an inclined side surface; a waveguide, formed on the top surface of the substrate and provided with a light source, an optical detector and a coupling lens; and an optical device attached to the inclined side surface and provided with a first and a second regions, the first region reflecting a first light from the light source to the coupling lens and the second region operating in one of electrically switchable first and second modes in accordance with the type of the optical disk, wherein the first light incident to the second region is transmitted to outside of the optical pickup system in the first mode and is reflected to the coupling lens by the second region in the second mode, the reflected light being focused on the optical disk by the coupling lens and reflected back thereto to travel in the reverse direction to the optical detector.
  • Fig. 1 represents a schematic diagram of the prior art optical pickup system
  • Fig. 2 shows a schematic diagram of the inventive optical pickup system
  • Fig. 3 displays a explanatory diagram representing an optical path of a light beam in accordance with the inventive integrated optical pickup system shown in Fig. 2;
  • Fig. 4A explains the operation of the optical device shown in Fig. 2 when a voltage Vcc is applied thereto;
  • Figs. 4B and 4C provide explanatory diagrams of a second optical element and an upper transparent electrode in the optical device shown in Fig. 4A, respectively;
  • Fig. 4D illustrates the operation of the optical device shown in Fig. 2 when the Vcc is not applied thereto.
  • FIGs. 2 to 4 there are illustrated optical pickup systems in accordance with preferred embodiments of the present invention. It should be noted that like parts appearing in Figs. 2 to 4 are represented by like reference numerals.
  • FIG. 2 there is a schematic diagram of an optical pickup system 200 operating in either one of a first and a second mode, which are electrically switchable therebetween in accordance with the type of an optical disk.
  • the optical pickup system 200 comprises a glass substrate 202 having a top surface and an inclined side surfaces; an optical device 230 provided with a central and a peripheral regions 230-1, 230-2 and attached to the inclined side surface of the glass substrate 202; a waveguide layer 204 provided with an end, a top and a bottom surfaces, a twin focusing beam splitter 220, a reflection collimating lens 250 and a transmission off-axis diffractive objective lens 260 integrated on the top surface of the waveguide layer 204; a light source 210, e.g., a semiconductor laser, for generating a light beam, which can be of a first linearly polarized, e.g., P-polarized, light beam with a wavelength ⁇ and a first and a second optical detectors being attached to the end surface of the
  • an angle between the top and the inclined side surfaces is less than 90 degrees.
  • the light beam emitted from the light source 210 impinges onto the end surface of the waveguide layer 204 which is disposed adjacent to the glass substrate 202 so that it propagates through the waveguide layer 204 as a guided light beam.
  • the guided light beam after passing through the twin focusing beam splitter 220, is substantially collimated by the reflection collimating lens 250, which then reflects the collimated light beam to the optical device 230 through the glass substrate 202.
  • the optical pickup system 200 When a thick optical disk 280 having, e.g., a thickness of 1.2mm, is loaded on a disk tray (not shown) , the optical pickup system 200 operates in the first mode, wherein a predetermined voltage Vcc is applied to the optical device 230.
  • the central region 230-1 of the optical device 230 is reflective and serves as an aperture, whereas the peripheral region 230- 2 thereof is transmissive to the collimated light beam impinged thereonto, as will be described in detail hereinafter.
  • the transmission off -axis diffractive objective lens 260 has a number of gratings as shown in Fig. 3. Each of the gratings is of an elliptic shape to thereby make the collimated light beam incident onto the transmission off-axis diffractive objective lens 260 at an oblique angle converge onto a focal point on the optical disk 280 along an optical axis formed by a central point of the transmission off-axis diffractive objective lens 260 and a convergence point thereof.
  • the portion of the collimated light beam is focused on the loaded optical disk 280 by the transmission off-axis diffractive objective lens 260 and reflected back thereto to travel to the twin focusing beam splitter 220 along the same optical path in a reverse direction.
  • the reflected light beam entering the twin focusing beam splitter 220 after passing therethrough, splits into a first and a second divided light beams, respectively.
  • the twin focusing beam splitter 220 includes a first and a second parts 222, 224, each part being made to have a separate focal point, as shown in Fig. 3.
  • the first and the second optical detectors 290, 292 are placed at the focal points of the first and the second parts 222, 224 of the twin focusing beam splitter 220, respectively.
  • the first and the second divided light beams impinge onto the first and the second optical detectors 290, 292 so as to be converted into electric signals by means of the first and the second optical detectors 290, 292.
  • the peripheral region 230-2 of the optical device 230 transmits the remaining portion of the collimated light beam falling thereon to outside of the optical pickup system 200, whereby the remaining portion which is represented by solid lines m Fig. 2 is not used for reading information signals off the loaded optical disk 280.
  • FIG. 4A there is shown a diagram illustrating the operation of the optical device 230 shown in Fig. 2 when the Vcc is supplied to a lower and an upper transparent electrodes 233, 235 in the optical device 230 by closing a switch 238.
  • the optical device 230 includes a first optical element 232, the electrodes 233, 235 made of, e.g., ITO (indium tin oxide) or the like, a liquid crystal 234, and a second optical element 236 provided with a first and a second portions 236A, 236B.
  • ITO indium tin oxide
  • the lower transparent electrode 233 is formed on top of the first optical element 232, while the liquid crystal 234, the upper transparent electrode 235 and the second portion 236B of the second optical element 236 are mounted on a peripheral region of the lower transparent electrode 233, sequentially, so that the peripheral region 230-2 corresponds to a region of the optical device 230 under the second portion 236B of the optical element 236.
  • Figs. 4B and 4C there are shown explanatory diagrams of the second optical element 236 and the upper transparent electrode 235 in the optical device 230 shown in Fig. 4A, respectively.
  • the second optical element 236 is divided into the first and the second portions 236A, 236B by a division circle 236C.
  • the second portion 236B is in the form of an annular disk.
  • the first portion 236A of the second optical element 236 transmits a polarization component of a light beam, e.g., an S- polarized light beam, and reflects another, e.g., a P- polarized light beam, which is linearly polarized and perpendicular to the S-polarized light beam, whereas the second portion 236B transmits a P-polarized light beam, and reflects an S-polarized light beam.
  • the upper transparent electrode 235 is in the form of an annular disk whose inner circle has a radius same as that of the second portion 236B, as shown in Fig. 4C. Referring back to Fig.
  • the portion of the collimated light beam incident to the first portion 236A of the second optical element 236 is reflected to the transmission off-axis diffractive objective lens 260, whereas the remaining portion of the collimated light beam incident to the second portion 236B of the second optical element 236 enters the liquid crystal 234 which is made of a doubly refracting crystal such as a nematic liquid crystal or the like.
  • the remaining portion of the collimated light beam remains unchanged after passing through the liquid crystal 234, since a fraction of the liquid crystal under the upper transparent electrode 235 serves as a material transparent to a light beam impinged thereto.
  • the remaining portion passing through the liquid crystal 234 is transmitted to the outside of the optical pickup system 200 through the lower transparent electrode
  • the central region 230-1 of the optical device 230 serves as an aperture for shaping a cross section of a light beam impinging onto the transmission off-axis diffractive objective lens 260.
  • the optical pickup system 200 operates in the second mode.
  • the optical device 230 In the second mode, no voltage is applied to the optical device 230 so that both of the central and the peripheral region 230-1, 230-2 are reflective, wherein solid lines represent the optical paths of the light beam for use in detecting information signals recorded on the loaded optical disk 282. Therefore, the whole area of the optical device 230 functions as an aperture for shaping a cross section of a light beam impinging onto the transmission off-axis diffractive objective lens 260, as will be described in detail hereinafter .
  • Fig. 4D there is shown a diagram of the operation of the optical device 230 shown in Fig. 2 when the Vcc is applied to the lower and the upper transparent electrodes 233, 235 in the optical device 230 by closing a switch 238.
  • the remaining portion of the collimated light beam impinging onto the peripheral region 230-2 is transmitted to the liquid crystal 234 through the second portion 236B of the second optical element 236.
  • the thickness of the liquid crystal 234 is set to a thickness value which introduces a phase difference of a magnitude of an odd number multiple of ⁇ /2 to the light beam impinged thereonto, after passing therethrough, when the Vcc is not applied to the electrodes 233, 235. Therefore, the remaining portion of the collimated light beam transmitted through the liquid crystal 234 is converted into an S-polarized light beam.
  • the converted S-polarized light beam is reflected back to the liquid crystal 234 by the first optical element 232.
  • the converted S-polarized light beam from the second optical element 232 is converted into a P- polarized light beam after passing through the liquid crystal 234. Thereafter, the converted P-polarized light beam is transmitted to the transmission off-axis diffractive objective lens 260 through the upper transparent electrode 235 and the second portion 236B of the second optical element 236 so that the peripheral region 230-2 is reflective. Therefore, the whole area of the optical device 230 functions as the aperture in the second mode .

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Head (AREA)

Abstract

L'invention concerne un système capteur optique fonctionnant dans l'un d'un premier mode et d'un deuxième mode commutables électriquement, en fonction du chargement d'un disque optique sur un porte-disques. Ce système capteur optique comporte un substrat possédant une surface supérieure et une surface latérale inclinée, un guide d'ondes formé sur la surface supérieure du substrat et pourvu d'une source lumineuse, un détecteur optique et une lentille de couplage, ainsi qu'un dispositif optique fixé sur la surface latérale inclinée et muni d'une première et d'une deuxième région, la première région réfléchissant une première composante à polarisation linéaire du faisceau lumineux, depuis la source lumineuse jusqu'à la lentille de couplage, et la deuxième région fonctionnant dans l'un du premier et du deuxième mode commutables électriquement, en fonction du type du disque optique. Dans le système, la lumière incidente à la deuxième région est transmise à l'extérieur du système capteur optique dans le premier mode et est réfléchie sur la lentille de couplage par la deuxième région dans le deuxième mode. La lumière réfléchie est focalisée sur le disque optique par la lentille de couplage et est réfléchie à nouveau sur cette dernière pour se déplacer en sens inverse par rapport au détecteur optique.
PCT/KR1998/000420 1997-12-16 1998-12-11 Systeme capteur optique integre s'utilisant avec des disques optiques d'epaisseurs differentes WO1999031658A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1997/69020 1997-12-16
KR1019970069042A KR19990050020A (ko) 1997-12-16 1997-12-16 액정홀로그램 듀얼 포커스 광픽업장치
KR1019970069020A KR19990049998A (ko) 1997-12-16 1997-12-16 광량조절형 액정판 듀얼 포커스 광픽업장치
KR1997/69042 1997-12-16

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WO1999031658A1 true WO1999031658A1 (fr) 1999-06-24

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005027108A1 (fr) * 2003-09-18 2005-03-24 Koninklijke Philips Electronics N.V. Systeme pour lire des donnees stockees sur un support d'information
EP1669987A3 (fr) * 2004-12-08 2009-01-14 Electronics and Telecommunications Research Institute Tête de lecture optique avec coupleur optique d'entrée sortie sur guide d'ondes planaire
CN107873086A (zh) * 2015-01-12 2018-04-03 迪吉伦斯公司 环境隔离的波导显示器
US11009699B2 (en) 2012-05-11 2021-05-18 Digilens Inc. Apparatus for eye tracking
US11194162B2 (en) 2017-01-05 2021-12-07 Digilens Inc. Wearable heads up displays
US11281013B2 (en) 2015-10-05 2022-03-22 Digilens Inc. Apparatus for providing waveguide displays with two-dimensional pupil expansion
US11442151B2 (en) 2015-01-20 2022-09-13 Digilens Inc. Holographic waveguide LIDAR
US11442222B2 (en) 2019-08-29 2022-09-13 Digilens Inc. Evacuated gratings and methods of manufacturing
US11448937B2 (en) 2012-11-16 2022-09-20 Digilens Inc. Transparent waveguide display for tiling a display having plural optical powers using overlapping and offset FOV tiles
US11480788B2 (en) 2015-01-12 2022-10-25 Digilens Inc. Light field displays incorporating holographic waveguides
US11543594B2 (en) 2019-02-15 2023-01-03 Digilens Inc. Methods and apparatuses for providing a holographic waveguide display using integrated gratings
US11662590B2 (en) 2013-05-20 2023-05-30 Digilens Inc. Holographic waveguide eye tracker
US11703645B2 (en) 2015-02-12 2023-07-18 Digilens Inc. Waveguide grating device
US11709373B2 (en) 2014-08-08 2023-07-25 Digilens Inc. Waveguide laser illuminator incorporating a despeckler
US11726332B2 (en) 2009-04-27 2023-08-15 Digilens Inc. Diffractive projection apparatus
US11726323B2 (en) 2014-09-19 2023-08-15 Digilens Inc. Method and apparatus for generating input images for holographic waveguide displays
US11747568B2 (en) 2019-06-07 2023-09-05 Digilens Inc. Waveguides incorporating transmissive and reflective gratings and related methods of manufacturing

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Publication number Priority date Publication date Assignee Title
EP0468612A2 (fr) * 1990-07-25 1992-01-29 Pioneer Electronic Corporation Tête de lecture optique
JPH06111358A (ja) * 1992-09-29 1994-04-22 Ricoh Co Ltd 光導波路素子
JPH08221780A (ja) * 1995-02-09 1996-08-30 Fujikura Ltd 集積型光ピックアップ装置

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Publication number Priority date Publication date Assignee Title
EP0468612A2 (fr) * 1990-07-25 1992-01-29 Pioneer Electronic Corporation Tête de lecture optique
JPH06111358A (ja) * 1992-09-29 1994-04-22 Ricoh Co Ltd 光導波路素子
JPH08221780A (ja) * 1995-02-09 1996-08-30 Fujikura Ltd 集積型光ピックアップ装置

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Title
PATENT ABSTRACTS OF JAPAN, Vol. 94, 1994; & JP 06111358 A (RICOH CO., LTD.) 22 April 1994. *
PATENT ABSTRACTS OF JAPAN, Vol. 96, No. 12, 1996; & JP 08221780 A (FUJIKURA LTD.) 26 December 1996. *

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7308172B2 (en) 2003-09-18 2007-12-11 Koninklijke Philips Electronics N.V. System for reading data stored on an information carrier
WO2005027108A1 (fr) * 2003-09-18 2005-03-24 Koninklijke Philips Electronics N.V. Systeme pour lire des donnees stockees sur un support d'information
EP1669987A3 (fr) * 2004-12-08 2009-01-14 Electronics and Telecommunications Research Institute Tête de lecture optique avec coupleur optique d'entrée sortie sur guide d'ondes planaire
US7580336B2 (en) 2004-12-08 2009-08-25 Electronics And Telecommunications Research Institute Optical head having a beam input/output coupler on a planar waveguide
US11726332B2 (en) 2009-04-27 2023-08-15 Digilens Inc. Diffractive projection apparatus
US11994674B2 (en) 2012-05-11 2024-05-28 Digilens Inc. Apparatus for eye tracking
US11009699B2 (en) 2012-05-11 2021-05-18 Digilens Inc. Apparatus for eye tracking
US11448937B2 (en) 2012-11-16 2022-09-20 Digilens Inc. Transparent waveguide display for tiling a display having plural optical powers using overlapping and offset FOV tiles
US11662590B2 (en) 2013-05-20 2023-05-30 Digilens Inc. Holographic waveguide eye tracker
US11709373B2 (en) 2014-08-08 2023-07-25 Digilens Inc. Waveguide laser illuminator incorporating a despeckler
US11726323B2 (en) 2014-09-19 2023-08-15 Digilens Inc. Method and apparatus for generating input images for holographic waveguide displays
CN111323867A (zh) * 2015-01-12 2020-06-23 迪吉伦斯公司 环境隔离的波导显示器
US11726329B2 (en) 2015-01-12 2023-08-15 Digilens Inc. Environmentally isolated waveguide display
US11480788B2 (en) 2015-01-12 2022-10-25 Digilens Inc. Light field displays incorporating holographic waveguides
CN107873086A (zh) * 2015-01-12 2018-04-03 迪吉伦斯公司 环境隔离的波导显示器
US11740472B2 (en) 2015-01-12 2023-08-29 Digilens Inc. Environmentally isolated waveguide display
US10437064B2 (en) 2015-01-12 2019-10-08 Digilens Inc. Environmentally isolated waveguide display
CN107873086B (zh) * 2015-01-12 2020-03-20 迪吉伦斯公司 环境隔离的波导显示器
US11442151B2 (en) 2015-01-20 2022-09-13 Digilens Inc. Holographic waveguide LIDAR
US11703645B2 (en) 2015-02-12 2023-07-18 Digilens Inc. Waveguide grating device
US11754842B2 (en) 2015-10-05 2023-09-12 Digilens Inc. Apparatus for providing waveguide displays with two-dimensional pupil expansion
US11281013B2 (en) 2015-10-05 2022-03-22 Digilens Inc. Apparatus for providing waveguide displays with two-dimensional pupil expansion
US11586046B2 (en) 2017-01-05 2023-02-21 Digilens Inc. Wearable heads up displays
US11194162B2 (en) 2017-01-05 2021-12-07 Digilens Inc. Wearable heads up displays
US11543594B2 (en) 2019-02-15 2023-01-03 Digilens Inc. Methods and apparatuses for providing a holographic waveguide display using integrated gratings
US11747568B2 (en) 2019-06-07 2023-09-05 Digilens Inc. Waveguides incorporating transmissive and reflective gratings and related methods of manufacturing
US11592614B2 (en) 2019-08-29 2023-02-28 Digilens Inc. Evacuated gratings and methods of manufacturing
US11442222B2 (en) 2019-08-29 2022-09-13 Digilens Inc. Evacuated gratings and methods of manufacturing
US11899238B2 (en) 2019-08-29 2024-02-13 Digilens Inc. Evacuated gratings and methods of manufacturing

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