DE19751190A1 - Laser display device has a polymer-dispersed liquid crystal disk - Google Patents
Laser display device has a polymer-dispersed liquid crystal diskInfo
- Publication number
- DE19751190A1 DE19751190A1 DE1997151190 DE19751190A DE19751190A1 DE 19751190 A1 DE19751190 A1 DE 19751190A1 DE 1997151190 DE1997151190 DE 1997151190 DE 19751190 A DE19751190 A DE 19751190A DE 19751190 A1 DE19751190 A1 DE 19751190A1
- Authority
- DE
- Germany
- Prior art keywords
- display device
- pdlc
- laser display
- liquid crystal
- laser
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Dispersion Chemistry (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
Abstract
Description
Die Erfindung betrifft eine Laseranzeigevorrichtung mit den im Oberbegriff des Patentanspruchs 1 genann ten Merkmalen.The invention relates to a laser display device with the genann in the preamble of claim 1 characteristics.
Es ist bekannt, daß Laserlicht beim Auftreffen auf endlich rauhe Oberflächen charakteristische Muster zeichnet. Beim Auftreffen von mit einer Linse aufge weitetem Laserlicht auf eine weiße Oberfläche, wird ein granulationsartiges Fleckenmuster sichtbar. Die ses Fleckenmuster besitzt zudem die Eigenart, an al len Punkten des Raumes scharf zu erscheinen. Dieses sogenannte Specklemuster resultiert aus der Kohärenz des Laserlichts im Zusammenspiel mit der Rauhigkeit der Oberfläche. Besonders bei solchen Lasersystemen, die ein reelles Zwischenbild im Strahlengang zur Bil derzeugung verwenden, beeinträchtigen diese Muster die Wiedergabequalität des Abbildungssystems. Diese Specklemuster beeinträchtigen in erster Linie den subjektiven Bildeindruck eines Betrachters. It is known that laser light strikes it finally rough surfaces characteristic patterns draws. When struck with a lens laser light onto a white surface a granulation-like stain pattern is visible. The This stain pattern also has the peculiarity of al len points of the room to appear sharp. This so-called speckle patterns result from coherence of the laser light in interaction with the roughness the surface. Especially with such laser systems, which is a real intermediate image in the beam path to Bil use generation interfere with these patterns the rendering quality of the imaging system. This Speckle patterns primarily affect the subjective image impression of a viewer.
Bekannt sind Systeme zur Vermeidung dieser Specklemu ster, bei denen durch periodisches Ein- und Ausschal ten des Lasingprozesses das Laserlicht moduliert beziehungsweise gepulst wird. Nachteilig ist jedoch, daß an sich einfache Laserlichtquellen mit relativ aufwendiger Technik zur Pulsation versehen werden müssen. Bekannt sind weiterhin Methoden, bei denen zwei Streuscheiben in einer Zwischenbildebene des Strahlenganges mechanisch bewegt werden. Nachteilig sind jedoch die zusätzlich notwendigen bewegten me chanischen Teile, die zudem sehr präzise geführt werden müssen.Systems for avoiding this specklemu are known where, by periodic switching on and off The laser process modulates the laser light or pulsed. However, the disadvantage is that simple laser light sources with relative complex technology for pulsation have to. Methods are also known in which two lenses in an intermediate image plane of the Beam path are moved mechanically. Disadvantageous are the additional necessary moving me chanic parts, which are also guided very precisely Need to become.
Der Erfindung liegt daher die Aufgabe zugrunde, eine möglichst einfache Filtereinrichtung für Laseranzei gevorrichtungen zur Vermeidung von Specklemustern zu schaffen.The invention is therefore based on the object as simple as possible filter device for laser display devices to avoid speckle patterns create.
Die erfindungsgemäße Laseranzeigevorrichtung mit den im Patentanspruch 1 genannten Merkmalen bietet den Vorteil, daß die im Strahlengang einer Laserlicht quelle angeordnete Filtereinrichtung auf relativ ein fachem Wege die Abbildungsqualität der Laseranzeige vorrichtung verbessern kann. Durch in einer Matrix aus Polymermaterial eingebettete Flüssigkristalle entsteht eine sogenannte Polymer-Dispergierte Flüs sigkristallscheibe (PDLC), die völlig ohne mechani sche Teile auskommt und deren Filterwirkung durch Anlegen einer äußeren Spannung an mit den Flüssig kristallen in Verbindung stehende Elektroden beein flußbar ist. Eine solche PDLC kann beispielsweise im Strahlengang einer Laserlichtquelle mit nachgeschal teten Zeilen-Spalten-Scanner angeordnet sein und dadurch die Abbildungsqualität einer Zwischenbild ebene verbessern. Ebenso möglich ist eine Hinterein anderanordnung mehrerer solcher PDLC mit zwischenge schalteten Sammellinsen zur weiteren Verbesserung der Abbildungsqualität.The laser display device according to the invention with the features mentioned in claim 1 offers the Advantage that in the beam path of a laser light source arranged filter device on relatively the imaging quality of the laser display device can improve. Through in a matrix liquid crystals embedded in polymer material a so-called polymer-dispersed flux is created sig crystal disc (PDLC), which completely without mechani parts and their filter effect Apply an external voltage to the liquid crystals related electrodes affect is flowable. Such a PDLC can for example in Beam path of a laser light source with reshaped row-column scanners can be arranged and thereby the image quality of an intermediate image improve level. Backing up is also possible different arrangement of several such PDLC with intermediate switched converging lenses to further improve the Picture quality.
Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den übrigen, in den Unteransprüchen genann ten, Merkmalen.Advantageous refinements of the invention result from the rest, called in the subclaims characteristics.
Die Erfindung wird nachfolgend in Ausführungsbeispie len anhand der zugehörigen Zeichnungen näher erläu tert. Es zeigen:The invention is described below in exemplary embodiment len with reference to the accompanying drawings tert. Show it:
Fig. 1 eine Prinzipdarstellung zur Funktions weise einer Flüssigkristall-Streuscheibe; Fig. 1 shows a schematic diagram of how a liquid crystal lens works;
Fig. 2 eine Prinzipdarstellung zur Anordnung einer Flüssigkristall-Streuscheibe in einer Zwischenbildebene und Fig. 2 is a schematic diagram of the arrangement of a liquid crystal diffuser in an intermediate image plane and
Fig. 3 eine Prinzipdarstellung einer Laser anzeigevorrichtung mit zwei Flüssig kristall-Streuscheiben im Strahlengang. Fig. 3 is a schematic diagram of a laser display device with two liquid crystal lenses in the beam path.
Fig. 1 zeigt eine Prinzipdarstellung zur Verdeutli chung der Funktionsweise einer im Strahlengang 3 einer hier nicht dargestellten Laserlichtquelle be findlichen Flüssigkristall-Streuscheibe 10. Diese besteht im wesentlichen aus einer Polymer-Dispergier ten Flüssigkristallanzeige (PDLC). Eine derartige, im folgenden als PDLC 10 bezeichnete Polymer-Disper gierte Flüssigkristallanzeige, eignet sich durch ihre besonderen optischen Eigenschaften gut als Streu scheibe, die in eine Zwischenbildebene des Strahlen ganges einer Laseranzeigevorrichtung eingebracht wer den kann. Eine solche PDLC 10 besteht typischerweise aus zwei Glasscheiben 16, 18 und einer dazwischen befindlichen Matrix 12 aus Polymermaterial, in die kleine Bereiche mit Flüssigkristallen 14 eingebettet sind. An die Flüssigkristalle 14 kann über zwei nach außen geführte Elektroden 20, 22 ein elektrisches Feld angelegt werden. Abhängig vom diesem elektri schen Feld bilden sich in den Flüssigkristallen 14 kleine optische Streuzentren. Durch eine gezielte Modulation der Ansteuerspannung an die PDLC 10 lassen sich die Lage und die Wirkung der Streuzentren beein flussen. Dadurch kann die Bildung von Specklemustern minimiert werden, wodurch die Abbildungsqualität von Laseranzeigevorrichtungen verbessert wird. Beispiels weise wird durch Anlegen einer schwächeren Ansteuer spannung eine relativ schwache Streuung erzielt. Diese Situation ist in Bild 1b durch einen leicht aufgefächerten Laserstrahl 6 angedeutet. Wie in Bild 1a erkennbar, ist bei voller Ansteuerspannung die Streuung nahezu vollständig ausgeschaltet. Ein ein kommender Laserstrahl 3 geht nahezu ohne Streuung durch das PDLC 10 und bildet einen ausgehenden Laser strahl 4. Bei spannungslosem PDLC ist die Streuung dagegen relativ stark (Fig. 1c), was durch einen weiter aufgefächerten ausgehenden Strahl 8 angedeutet wird. Hier treten dann entsprechend ausgeprägtere Specklemuster auf. Fig. 1 shows a schematic diagram to illustrate the mode of operation of a liquid crystal lens 10 in the beam path 3 of a laser light source, not shown here. This consists essentially of a polymer-dispersing liquid crystal display (PDLC). Such, in the following referred to as PDLC 10 polymer-dispersed liquid crystal display, is suitable due to its special optical properties well as a lens that can be introduced into an intermediate image plane of the beam path of a laser display device. Such a PDLC 10 typically consists of two glass panes 16 , 18 and an intervening matrix 12 of polymer material, in which small areas with liquid crystals 14 are embedded. An electric field can be applied to the liquid crystals 14 via two electrodes 20 , 22 which are led outwards. Depending on this electric field, 14 small optical scattering centers are formed in the liquid crystals. The position and the effect of the scattering centers can be influenced by targeted modulation of the control voltage on the PDLC 10 . This can minimize the formation of speckle patterns, thereby improving the imaging quality of laser display devices. For example, a relatively weak spread is achieved by applying a weaker control voltage. This situation is indicated in Figure 1b by a slightly fanned out laser beam 6 . As can be seen in Figure 1a, the scatter is almost completely switched off at full control voltage. An incoming laser beam 3 passes through PDLC 10 almost without scattering and forms an outgoing laser beam 4. In the case of de-energized PDLC, however, the scattering is relatively strong ( FIG. 1c), which is indicated by a further fanned out beam 8 . Correspondingly more pronounced speckle patterns then occur here.
Fig. 2 zeigt eine beispielhafte Anordnung einer PDLC 10 in einer Zwischenbildebene eines Strahlenganges einer Laseranzeigevorrichtung. Gleiche Teile wie in Fig. 1 sind mit gleichen Bezugszeichen versehen und nicht noch einmal erläutert. Eine Laserlichtquelle 2 erzeugt ein kohärentes Laserlichtbündel 3, das mit einer optischen Ablenkeinheit, beispielsweise einem Zeilen-Spalten-Scanner 24 auf eine Fläche abgebildet wird. In diesem aufgefächerten Strahlenbündel 7 ist eine erfindungsgemäße PDLC 10 angeordnet, die ent sprechend einer an seine Elektroden angelegten An steuerspannung für eine mehr oder weniger starke Auffächerung des ausgehenden Laserlichtbündels 28 und damit für eine Verbesserung der Abbildungsqualität der Laseranzeigevorrichtung sorgen kann. Fig. 2 shows an exemplary arrangement of a PDLC 10 in an intermediate image plane of an optical path of a laser display apparatus. The same parts as in Fig. 1 are given the same reference numerals and not explained again. A laser light source 2 generates a coherent laser light bundle 3 , which is imaged onto an area using an optical deflection unit, for example a row-column scanner 24 . In this fanned beam 7 , a PDLC 10 according to the invention is arranged, which can accordingly provide a control voltage applied to its electrodes for a more or less fanning out of the outgoing laser light beam 28 and thus for an improvement in the imaging quality of the laser display device.
Fig. 3 zeigt schließlich eine weitere Variante, bei der zwei PDLC 10 nacheinander in einem Strahlengang angeordnet sind, um auf diese Weise eine weitere Verbesserung der Abbildungsqualitäten durch Auftreten von Specklemustern zu erreichen. Gleiche Teile wie in den vorangegangenen Figuren sind mit gleichen Bezugs zeichen versehen und nicht noch einmal erläutert. Finally, FIG. 3 shows a further variant in which two PDLC 10 are arranged one after the other in a beam path in order to achieve a further improvement in the imaging qualities by the appearance of speckle patterns. The same parts as in the previous figures are provided with the same reference characters and not explained again.
Hier ist einem Zeilen-Spalten-Scanner 24 eine erste PDLC 10 nachgeordnet, diesem dann eine Sammellinse 26 und eine zweite PDLC 11 in einer zweiten reellen Zwi schenbildebene. Die erste PDLC 10 sorgt bereits für eine Verbesserung der Anzeigequalität durch eine Verringerung von Specklemustern. Der die PDLC 10 durchlaufende Strahlengang 30 wird weiter fokussiert mit der Sammellinse 26 und durchläuft als gebündelter Laserstrahlengang 32 eine zweite PDLC 11 und bildet schließlich den ausgehenden Strahlengang 34, der nochmals eine deutlich höhere Abbildungsqualität liefern kann als beispielsweise der Strahlengang 28 aus Fig. 2, der lediglich eine PDLC 10 durchlaufen hat.Here a row-column scanner 24 is followed by a first PDLC 10 , this is then a converging lens 26 and a second PDLC 11 in a second real intermediate image plane. The first PDLC 10 already improves the display quality by reducing speckle patterns. The beam path 30 passing through the PDLC 10 is further focused with the converging lens 26 and, as a bundled laser beam path 32, passes through a second PDLC 11 and finally forms the outgoing beam path 34 , which can again deliver a significantly higher imaging quality than, for example, the beam path 28 from FIG. 2, who only went through a PDLC 10 .
Claims (7)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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DE1997151190 DE19751190A1 (en) | 1997-11-19 | 1997-11-19 | Laser display device has a polymer-dispersed liquid crystal disk |
IT98MI002453 IT1303892B1 (en) | 1997-11-19 | 1998-11-12 | LASER INDICATOR DEVICE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997151190 DE19751190A1 (en) | 1997-11-19 | 1997-11-19 | Laser display device has a polymer-dispersed liquid crystal disk |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19751190A1 true DE19751190A1 (en) | 1999-05-20 |
Family
ID=7849159
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1997151190 Withdrawn DE19751190A1 (en) | 1997-11-19 | 1997-11-19 | Laser display device has a polymer-dispersed liquid crystal disk |
Country Status (2)
Country | Link |
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DE (1) | DE19751190A1 (en) |
IT (1) | IT1303892B1 (en) |
Cited By (46)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006133937A1 (en) * | 2005-06-14 | 2006-12-21 | Sony Deutschland Gmbh | Image generation unit and method to use an image generation unit |
WO2008087575A1 (en) * | 2007-01-19 | 2008-07-24 | Koninklijke Philips Electronics N.V. | Speckle reduction in a projection system |
DE102007021331A1 (en) | 2007-05-07 | 2008-11-13 | Robert Bosch Gmbh | Laser display device for projected display in vehicle, has laser light source for generating laser light beam and deflection unit for laser beam for generating images on scattering surface |
WO2009013597A2 (en) * | 2007-07-26 | 2009-01-29 | Milan Momcilo Popovich | Laser illumination device |
WO2009071927A1 (en) * | 2007-12-04 | 2009-06-11 | Bae Systems Plc | Improvements in or relating to diffuser screens |
WO2011055109A3 (en) * | 2009-11-03 | 2011-12-15 | Milan Momcilo Popovich | Apparatus for reducing laser speckle |
DE102012002161A1 (en) * | 2012-01-31 | 2013-08-01 | Friedrich-Schiller-Universität Jena | Method for three-dimensional optical surface measurement of objects by measurement device, involves projecting spectral narrow band optical patterns on object, and detecting patterns as location-differing image pattern of object surface |
US10089516B2 (en) | 2013-07-31 | 2018-10-02 | Digilens, Inc. | Method and apparatus for contact image sensing |
US10145533B2 (en) | 2005-11-11 | 2018-12-04 | Digilens, Inc. | Compact holographic illumination device |
US10156681B2 (en) | 2015-02-12 | 2018-12-18 | Digilens Inc. | Waveguide grating device |
US10185154B2 (en) | 2011-04-07 | 2019-01-22 | Digilens, Inc. | Laser despeckler based on angular diversity |
US10209517B2 (en) | 2013-05-20 | 2019-02-19 | Digilens, Inc. | Holographic waveguide eye tracker |
US10216061B2 (en) | 2012-01-06 | 2019-02-26 | Digilens, Inc. | Contact image sensor using switchable bragg gratings |
US10241330B2 (en) | 2014-09-19 | 2019-03-26 | Digilens, Inc. | Method and apparatus for generating input images for holographic waveguide displays |
US10330777B2 (en) | 2015-01-20 | 2019-06-25 | Digilens Inc. | Holographic waveguide lidar |
US10359736B2 (en) | 2014-08-08 | 2019-07-23 | Digilens Inc. | Method for holographic mastering and replication |
US10423222B2 (en) | 2014-09-26 | 2019-09-24 | Digilens Inc. | Holographic waveguide optical tracker |
US10437051B2 (en) | 2012-05-11 | 2019-10-08 | Digilens Inc. | Apparatus for eye tracking |
US10437064B2 (en) | 2015-01-12 | 2019-10-08 | Digilens Inc. | Environmentally isolated waveguide display |
US10459145B2 (en) | 2015-03-16 | 2019-10-29 | Digilens Inc. | Waveguide device incorporating a light pipe |
US10545346B2 (en) | 2017-01-05 | 2020-01-28 | Digilens Inc. | Wearable heads up displays |
US10591756B2 (en) | 2015-03-31 | 2020-03-17 | Digilens Inc. | Method and apparatus for contact image sensing |
US10642058B2 (en) | 2011-08-24 | 2020-05-05 | Digilens Inc. | Wearable data display |
US10670876B2 (en) | 2011-08-24 | 2020-06-02 | Digilens Inc. | Waveguide laser illuminator incorporating a despeckler |
US10678053B2 (en) | 2009-04-27 | 2020-06-09 | Digilens Inc. | Diffractive projection apparatus |
US10690851B2 (en) | 2018-03-16 | 2020-06-23 | Digilens Inc. | Holographic waveguides incorporating birefringence control and methods for their fabrication |
US10690916B2 (en) | 2015-10-05 | 2020-06-23 | Digilens Inc. | Apparatus for providing waveguide displays with two-dimensional pupil expansion |
US10732569B2 (en) | 2018-01-08 | 2020-08-04 | Digilens Inc. | Systems and methods for high-throughput recording of holographic gratings in waveguide cells |
US10859768B2 (en) | 2016-03-24 | 2020-12-08 | Digilens Inc. | Method and apparatus for providing a polarization selective holographic waveguide device |
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US10942430B2 (en) | 2017-10-16 | 2021-03-09 | Digilens Inc. | Systems and methods for multiplying the image resolution of a pixelated display |
US10983340B2 (en) | 2016-02-04 | 2021-04-20 | Digilens Inc. | Holographic waveguide optical tracker |
US11307432B2 (en) | 2014-08-08 | 2022-04-19 | Digilens Inc. | Waveguide laser illuminator incorporating a Despeckler |
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US11460621B2 (en) | 2012-04-25 | 2022-10-04 | Rockwell Collins, Inc. | Holographic wide angle display |
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-
1997
- 1997-11-19 DE DE1997151190 patent/DE19751190A1/en not_active Withdrawn
-
1998
- 1998-11-12 IT IT98MI002453 patent/IT1303892B1/en active
Cited By (79)
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WO2006133937A1 (en) * | 2005-06-14 | 2006-12-21 | Sony Deutschland Gmbh | Image generation unit and method to use an image generation unit |
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WO2008087575A1 (en) * | 2007-01-19 | 2008-07-24 | Koninklijke Philips Electronics N.V. | Speckle reduction in a projection system |
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US10234696B2 (en) | 2007-07-26 | 2019-03-19 | Digilens, Inc. | Optical apparatus for recording a holographic device and method of recording |
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WO2011055109A3 (en) * | 2009-11-03 | 2011-12-15 | Milan Momcilo Popovich | Apparatus for reducing laser speckle |
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US10642058B2 (en) | 2011-08-24 | 2020-05-05 | Digilens Inc. | Wearable data display |
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US10459311B2 (en) | 2012-01-06 | 2019-10-29 | Digilens Inc. | Contact image sensor using switchable Bragg gratings |
US10216061B2 (en) | 2012-01-06 | 2019-02-26 | Digilens, Inc. | Contact image sensor using switchable bragg gratings |
DE102012002161A1 (en) * | 2012-01-31 | 2013-08-01 | Friedrich-Schiller-Universität Jena | Method for three-dimensional optical surface measurement of objects by measurement device, involves projecting spectral narrow band optical patterns on object, and detecting patterns as location-differing image pattern of object surface |
US11460621B2 (en) | 2012-04-25 | 2022-10-04 | Rockwell Collins, Inc. | Holographic wide angle display |
US10437051B2 (en) | 2012-05-11 | 2019-10-08 | Digilens Inc. | Apparatus for eye tracking |
US11994674B2 (en) | 2012-05-11 | 2024-05-28 | 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 |
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ITMI982453A1 (en) | 2000-05-12 |
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