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WO1998007279A1 - Dispositif d'affichage de projection extremement efficace possedant des diviseurs de faisceau de polarisation a couche mince - Google Patents

Dispositif d'affichage de projection extremement efficace possedant des diviseurs de faisceau de polarisation a couche mince Download PDF

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Publication number
WO1998007279A1
WO1998007279A1 PCT/CA1997/000567 CA9700567W WO9807279A1 WO 1998007279 A1 WO1998007279 A1 WO 1998007279A1 CA 9700567 W CA9700567 W CA 9700567W WO 9807279 A1 WO9807279 A1 WO 9807279A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
thin film
polarized
display system
projection display
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.)
Ceased
Application number
PCT/CA1997/000567
Other languages
English (en)
Inventor
Li Li
Brian Thomas Sullivan
Jerzy A. Dobrowolski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Research Council of Canada
Original Assignee
National Research Council of Canada
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 US08/694,415 external-priority patent/US5912762A/en
Priority claimed from CA002183188A external-priority patent/CA2183188A1/fr
Application filed by National Research Council of Canada filed Critical National Research Council of Canada
Priority to US09/051,403 priority Critical patent/US5982541A/en
Priority to CA002233597A priority patent/CA2233597C/fr
Priority to EP97935403A priority patent/EP0855121A1/fr
Priority to US08/967,497 priority patent/US5884383A/en
Publication of WO1998007279A1 publication Critical patent/WO1998007279A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3167—Modulator illumination systems for polarizing the light beam

Definitions

  • Pile-of-plates polarizers consist of a stack of parallel transparent plates that are placed in series. They are mainly used in the ultraviolet and infrared parts of the spectrum. Normally, light is incident at each interface at the Brewster angle such that all thep- polarized light and only some of the ⁇ -polarized light is transmitted. If a sufficient number of such plates are placed in series, the transmitted light can be highly polarized and have a high extinction ratio. Although these polarizers act over a very broad spectral region, their angular field is limited. Reflection polarizers are based on a similar principle but use light reflected from one or more surfaces to polarize a light beam. One advantage of this polarizer is that its performance is independent of the wavelength. However, its performance is very sensitive to the angle of the incident beam. An additional complication is that the reflected light propagates in a different direction from that of the incident light.
  • the means for combining the encoded beams is preferably the same discriminator employed to separate the uncoded beams in to s- and p- polarized beams, in which case the encoded beams are reflected back into the device in accordance with a scheme that depends on the type of spatial modulators employed. However, this is not necessary and it is equally possible to combine the beams with a second similar polarizing beam discriminator downstream of the first. Instead of reflecting the encoded beams back into the first device, the encoded beams are transmitted to a second device where they are combined into the output beam.
  • Fig. 5. shows another three-dimensional view of the phase change on reflection fo ⁇ p- polarized light as in Fig. 4;
  • Fig. 13 shows the calculated transmittance curves for s-polarized light as a function of wavelength ratio for the same thin film systems as shown in Fig. 12.
  • the angle of incidence ⁇ is 57.3°.
  • Fig. 14 shows the calculated reflectance curves for / ⁇ -polarized light as a function of wavelength ratio for the same thin film systems as shown in Fig. 12.
  • the angle of incidence #> is 57.3°.
  • Fig. 25 is a cross-sectional view of another embodiment of a thin film polarizing device in accordance with the present invention.
  • the device acts also as a polarizer and only reflected / ⁇ -polarized light is used;
  • the basic structure 186 has (2Z.-1 ) alternatively low and high refractive index layers and the layers are embedded between two identical substrates
  • the shapes of the two prisms 250 and 254 are different.
  • the thin film coating is also deposited at the hypotenuse interface.
  • the thin film polarizing device is also configured as a reflective polarizer and only the reflected -polarized light is used.
  • the transmitted s- polarized light is absorbed by a light absorber 256.
  • a light absorber 256 In the arrangements shown in Figs. 26 and
  • the transmitted s-polarized light exiting the end face 409 is then incident upon the second "X" colour cube 447.
  • the coating 460 reflects red light and transmits green light.
  • the coating 461 reflects blue light and transmits green light.
  • the red, green and blue light beams are separated by the second "X" colour cube 447 and are incident upon the three corresponding monochrome reflective imaging elements 443, 444, and 445 respectively. These monochrome reflective imaging elements are fed with the corresponding colour images. For "on" pixels, the polarization of the light is rotated 90° by all three imaging elements, therefore the s-polarized light becomes as p-polarized.
  • DMDs is reflected at an "off angle about 20° from the incident beam and is directed to the second polarizing device 400 2 . Since the polarization is not changed by the DMD and light is reflected again by the second thin film polarizing device 400 2 and is projected to a screen 406. For “off pixels, the light from the DMD is reflected at an "off angle about 60° from the incident beam and is out of the collecting angle of the projection lens and is absorbed by an absorber. In this case, the projected image only consists of s-polarized light.
  • the offset is approximately a distance between the eyes of an average person or a distance related thereto and to the nature of the camera lenses employed.
  • the scene recorded by the first camera is viewed by only one of the viewer's eyes.
  • the scene recorded by the second camera is viewed by the other of the viewer's eyes.
  • the configuration shown and described with reference to Fig. 52 lends itself to this 3-D recording and viewing.
  • the thin film polarizing device acts both as the first and as the second polarizer. It has high transmittance and reflectance for the desired polarization, broad bandwidth, larger angular field and very high extinction ratios for both transmitted and reflected light. All light is used for imaging and no light is lost due to undesired polarization and by the thin film polarizing device. Therefore, it solves the problems associated with the use of dichroic sheet polarizers in conventional liquid crystal displays.
  • the preferred display systems are high efficient and can employ high power light sources because of the use of both planes of polarization and the non-absorbing nature of the thin film polarizing devices.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)

Abstract

Dispositif d'affichage de projection comprenant un diviseur/combineur de faisceau de polarisation à couche mince comportant un premier et un deuxième substrats transmettant la lumière sous forme de prismes, ainsi qu'une pluralité de couches minces situées entre les prismes. Ces couches minces possèdent des épaisseurs prédéterminées et des indices de réfraction permettant de séparer la lumière en faisceaux lumineux s-polarisés et p-polarisés. On utilise simultanément à la fois la réflexion intérieure totale frustrée et l'interférence des couches minces, de manière à permettre la transmission de la lumière s-polarisée et la réflexion de la lumière p-polarisée sur une plage importante de longueurs d'ondes et d'angles d'incidence. Ce dispositif comprend, de plus, deux modulateurs de lumière spatiaux servant à coder une image à projeter. On obtient un affichage tridimensionnel en appliquant un signal différent à chaque modulateur spatial.
PCT/CA1997/000567 1995-06-06 1997-08-13 Dispositif d'affichage de projection extremement efficace possedant des diviseurs de faisceau de polarisation a couche mince Ceased WO1998007279A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US09/051,403 US5982541A (en) 1996-08-12 1997-08-13 High efficiency projection displays having thin film polarizing beam-splitters
CA002233597A CA2233597C (fr) 1996-08-12 1997-08-13 Dispositif d'affichage de protection extremement efficace possedant des diviseurs de faisceau de polarisation a couche mince
EP97935403A EP0855121A1 (fr) 1996-08-13 1997-08-13 Dispositif d'affichage de projection extremement efficace possedant des diviseurs de faisceau de polarisation a couche mince
US08/967,497 US5884383A (en) 1995-06-06 1997-11-11 Method of securing a coupling to an end of a composite pipe

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US08/694,415 US5912762A (en) 1996-08-12 1996-08-12 Thin film polarizing device
CA2,183,188 1996-08-13
CA002183188A CA2183188A1 (fr) 1996-08-13 1996-08-13 Ecran de projection a rendement eleve comportant un diviseur de faisceau a polarisation en couches minces
US2341296P 1996-08-14 1996-08-14

Publications (1)

Publication Number Publication Date
WO1998007279A1 true WO1998007279A1 (fr) 1998-02-19

Family

ID=46203175

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1997/000567 Ceased WO1998007279A1 (fr) 1995-06-06 1997-08-13 Dispositif d'affichage de projection extremement efficace possedant des diviseurs de faisceau de polarisation a couche mince

Country Status (2)

Country Link
CA (1) CA2233597C (fr)
WO (1) WO1998007279A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1095297A1 (fr) * 1999-05-11 2001-05-02 Thomson-Csf Separateur de polarisations
US6310712B1 (en) 1997-10-29 2001-10-30 Teloptics Corporation Discrete element light modulating microstructure devices
US6462873B1 (en) * 2000-07-14 2002-10-08 Univ Hong Kong Science & Techn Polarizing beam splitter
WO2004004326A1 (fr) * 2002-06-27 2004-01-08 Koninklijke Philips Electronics N.V. Diviseur de faisceau a trajet optique replie pour ecran de retroprojection
DE10361915A1 (de) * 2003-12-29 2005-07-28 Bausenwein, Bernhard, Dr. 2-Kanal-Stereo-Bildanzeigevorrichtung mit mikroelektromechanischen Systemen
EP1008895A4 (fr) * 1998-05-20 2005-12-07 Fujitsu General Ltd Projecteur a cristaux liquides
EP1585344A3 (fr) * 1998-09-29 2008-01-02 Sony Corporation Dispositif d'affichage de type projecteur
US10477194B2 (en) 2012-04-25 2019-11-12 3M Innovative Properties Company Two imager projection device

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988010545A1 (fr) * 1987-06-19 1988-12-29 Fraunhofer-Gesellschaft Zur Förderung Der Angewand Dispositif de projection
EP0361559A2 (fr) * 1988-08-26 1990-04-04 Koninklijke Philips Electronics N.V. Dispositif de projection d'image
US5181054A (en) * 1990-08-10 1993-01-19 Thomson-Csf Device for the projection of images using two orthogonal components of light polarization
EP0560636A1 (fr) * 1992-03-13 1993-09-15 Sharp Kabushiki Kaisha Dispositif d'affichage à crystal liquide du type à projection
WO1993024857A1 (fr) * 1992-06-01 1993-12-09 Bell Communications Research, Inc. Systeme d'affichage independant de la polarisation
US5453859A (en) * 1993-06-03 1995-09-26 Matsushita Electric Industrial Co., Ltd. Polarization beam splitter and projection display apparatus
US5517340A (en) * 1995-01-30 1996-05-14 International Business Machines Corporation High performance projection display with two light valves
WO1997007418A1 (fr) * 1995-08-14 1997-02-27 National Research Council Of Canada Dispositif polarisant a couches minces

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988010545A1 (fr) * 1987-06-19 1988-12-29 Fraunhofer-Gesellschaft Zur Förderung Der Angewand Dispositif de projection
EP0361559A2 (fr) * 1988-08-26 1990-04-04 Koninklijke Philips Electronics N.V. Dispositif de projection d'image
US5181054A (en) * 1990-08-10 1993-01-19 Thomson-Csf Device for the projection of images using two orthogonal components of light polarization
EP0560636A1 (fr) * 1992-03-13 1993-09-15 Sharp Kabushiki Kaisha Dispositif d'affichage à crystal liquide du type à projection
WO1993024857A1 (fr) * 1992-06-01 1993-12-09 Bell Communications Research, Inc. Systeme d'affichage independant de la polarisation
US5453859A (en) * 1993-06-03 1995-09-26 Matsushita Electric Industrial Co., Ltd. Polarization beam splitter and projection display apparatus
US5517340A (en) * 1995-01-30 1996-05-14 International Business Machines Corporation High performance projection display with two light valves
WO1997007418A1 (fr) * 1995-08-14 1997-02-27 National Research Council Of Canada Dispositif polarisant a couches minces

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BERGSTEIN LEONARD: "Novel Thin-Film Polarizer for the Visible and Infra-red", JOURNAL OF THE OPTICAL SOCIETY OF AMERICA: PAPER NUMBER TUD18 OF THE 1971 SPRING MEETING OF THE OPTICAL SOCIETY OF AMERICA, TUCSON, AZ, USA, vol. 61, 5 April 1971 (1971-04-05) - 8 April 1971 (1971-04-08), NEW YORK US, pages 24A, XP002045068 *
LEES DAVID ET AL: "Versatile Frustrated-Total-Reflection Polarizer for the Infrared", OPTICS LETTERS, vol. 4, no. 2, February 1979 (1979-02-01), WASHINGTON US, pages 66 - 67, XP002045069 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6310712B1 (en) 1997-10-29 2001-10-30 Teloptics Corporation Discrete element light modulating microstructure devices
EP1008895A4 (fr) * 1998-05-20 2005-12-07 Fujitsu General Ltd Projecteur a cristaux liquides
EP1585344A3 (fr) * 1998-09-29 2008-01-02 Sony Corporation Dispositif d'affichage de type projecteur
EP1095297A1 (fr) * 1999-05-11 2001-05-02 Thomson-Csf Separateur de polarisations
US6462873B1 (en) * 2000-07-14 2002-10-08 Univ Hong Kong Science & Techn Polarizing beam splitter
WO2004004326A1 (fr) * 2002-06-27 2004-01-08 Koninklijke Philips Electronics N.V. Diviseur de faisceau a trajet optique replie pour ecran de retroprojection
DE10361915A1 (de) * 2003-12-29 2005-07-28 Bausenwein, Bernhard, Dr. 2-Kanal-Stereo-Bildanzeigevorrichtung mit mikroelektromechanischen Systemen
DE10361915B4 (de) * 2003-12-29 2009-03-05 Bausenwein, Bernhard, Dr. 2-Kanal-Stereo-Bildanzeigevorrichtung mit mikroelektromechanischen Systemen
US10477194B2 (en) 2012-04-25 2019-11-12 3M Innovative Properties Company Two imager projection device

Also Published As

Publication number Publication date
CA2233597C (fr) 2004-02-24
CA2233597A1 (fr) 1998-02-19

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