[go: up one dir, main page]

WO2008029337A1 - Mélangeur de faisceaux pour sources de lumière multiples - Google Patents

Mélangeur de faisceaux pour sources de lumière multiples Download PDF

Info

Publication number
WO2008029337A1
WO2008029337A1 PCT/IB2007/053532 IB2007053532W WO2008029337A1 WO 2008029337 A1 WO2008029337 A1 WO 2008029337A1 IB 2007053532 W IB2007053532 W IB 2007053532W WO 2008029337 A1 WO2008029337 A1 WO 2008029337A1
Authority
WO
WIPO (PCT)
Prior art keywords
beam combiner
light
light sources
cube
faces
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/IB2007/053532
Other languages
English (en)
Inventor
Jorgen M. Van Der Veer
Pieter Stroobach
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of WO2008029337A1 publication Critical patent/WO2008029337A1/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
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/149—Beam splitting or combining systems operating by reflection only using crossed beamsplitting surfaces, e.g. cross-dichroic cubes or X-cubes
    • 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
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses

Definitions

  • the present invention relates to an optical device, in particular to a beam combiner used for combining light beams emitted from multiple light sources.
  • Illumination systems, projection display systems and other optically based systems typically comprise a plurality of optical elements.
  • One key optical element of such systems is a beam combiner.
  • the function of a beam combiner is to combine the beams of different light sources into one beam. For example, for the purpose of creating a white beam in a projection display system, the beams of light sources emitting blue, red and green light, i.e. the three primary colours, can be combined.
  • Several methods can be used to form a beam combiner. Two of these methods are described below.
  • One method is to combine the beams using an arrangement of dichroic mirrors. Depending on the wavelength at which the light is emitted, the light that is incident on a dichroic mirror will either be reflected or transmitted. In such beam combiners, the arrangement of the mirrors creates light paths for the different beams so that they are combined into one single beam.
  • an x-cube prism which is a prism structure composed of four triangular prisms arranged in the form of a cube having two partially reflecting diagonal surfaces.
  • the light emitted from the light sources enter the x-cube prism and then impinges on the partially reflecting diagonal surfaces, which can either reflect or transmit the light, depending on the coatings of these partially reflecting diagonal surfaces.
  • a beam combiner based on an x-cube prism provides three positions at which the light sources can be located and a fourth position at which light exits.
  • US 2005/0219476 discloses such a system in which an x- cube prism is used to combine the light emitted from three light-recycling illumination systems. Before light beams emitted from the recycling illumination systems enter the x-cube prism, the light beams pass through light-collimating means. In another embodiment, the light also passes through a beam-splitting prism polarizer.
  • An objective of the invention is to solve or at least mitigate the above- mentioned problems of prior art and to provide a beam combiner which is more efficient, and/or easy to assemble, and/or which also enables control of the light beam exiting the beam combiner.
  • the present invention is based on the understanding that a beam combiner can be formed by arranging a plurality of x-cube prisms adjacent to each other in an inventive manner. This enables combining of light beams, produced for instance by a plurality of light sources, impinging on the faces of the x-cube prisms.
  • a beam combiner comprising at least two x-cube prisms arranged adjacent to each other, said prisms having a plurality of faces at which light beams enter the beam combiner and one face being defined as a front face, said beam combiner combining light beams entering the combiner into a beam exiting through said front face.
  • a great advantage of this beam combiner as compared to prior art beam combiners is that it enables usage of additional light sources without introducing corresponding loss of light power.
  • the beam combiner of the present invention is more efficient and is further easily expandable to a combiner employing a great number of x-cube prisms.
  • a beam combiner comprising x-cube prisms arranged adjacent to each other, wherein at least one face of the x-cube prisms is arranged to shape or to collimate the exiting beam.
  • lenses can be arranged at the faces of the x-cube prisms to focus the light emitted from the light sources or to focus the exiting beam.
  • a great advantage of the integration of optical functions in or at the faces of the x-cube prisms is that it reduces the power loss usually induced at each interface between two non-integrated separate components and therefore improves the system efficiency. Further, this beam combiner does not require any alignment of different interacting optical components since principal functionalities (collimating, focusing and shaping) are integrated in a single optical structure. Another advantage is that the beam combiner becomes very compact and therefore enables production of, for instance, very compact projection display systems.
  • a beam combiner wherein the lens arranged at one or more faces of the x-cube prisms is a liquid crystal lens for selectively altering the focus of the exiting beam.
  • the lens arranged at one or more faces of the x-cube prisms is a liquid crystal lens for selectively altering the focus of the exiting beam.
  • a beam combiner using single point light sources such as light emitting diodes (LEDs) or laser diodes at the faces of the x-cube prisms.
  • LEDs and laser diodes enable provision of optical systems that are smaller as compared to prior art systems which e.g. uses high pressure lamps, since these lamps are bulky in comparison to LEDs and laser diodes.
  • Another advantage of LEDs and laser diodes is that their light distributions are relatively narrow in comparison to other light sources. Thus, requirements on collimation of the light are milder for LEDs and laser diodes than for many other light sources.
  • beam combiners based on LEDs and laser diodes can be combined with high resolution imaging devices in e.g.
  • the LEDs and the laser diodes are easily controllable.
  • Another advantage provided by the beam combiner arrangement comprising several x-cube prisms is that almost all colours of the visible spectrum can be obtained and that a more "warm” white exiting beam can be produced when using light sources of different wavelengths from each other.
  • the colour of the exiting beam to a greater extent covers the full spectra that is visible to the human eye. In current CRT televisions and even in LCD televisions, only three colours are used to create a full colour image. However, this full colour picture does not comprise all the colours perceptible by the human eye.
  • Fig. 1 is a top view of a beam combiner comprising two x-cube prisms arranged adjacent to each other to form a beam combiner for multiple light sources in accordance with an embodiment of the present invention.
  • Fig. 2 is a top view of a beam combiner comprising two x-cube prisms arranged adjacent to each other to form a beam combiner for multiple light sources, wherein the faces of the x-cube prisms are curved, in accordance with another embodiment of the present invention.
  • x-cube prisms 10 and 20 are arranged adjacent to each other.
  • Each x-cube prism is made of four prisms also arranged adjacent to each other. These four prisms are preferably triangular but may alternatively have other shapes.
  • the x-cube prisms 10 and 20 each have two partially reflective diagonal surfaces, 15 and 16, and 25 and 26, respectively, as well as four active faces, 11, 12, 13 and 14, and 21, 22, 23 and 24, respectively, which are not perpendicular to their respective diagonal surfaces.
  • the beam combiner 1 further comprises five light sources Ll, L2, L3, L4 and L5 emitting light at five different wavelengths. These light sources are positioned at faces 12, 13, 21, 22 and 24 of the x-cube prisms 10 and 20, leaving one face 14 free from light source (this face is referred to as front face in the following).
  • the joint faces 11 and 23 of the two x-cube prisms 10 and 20 are preferably flat.
  • the beam combiner of the present embodiment provides two more positions at which additional light sources can be placed. Thus, the total output power of the beam combiner 1 is increased. In addition, this arrangement provides higher flexibility in choice of colours.
  • the diagonal surfaces 15, 16, 25 and 26 of the x-cube prisms 10 and 20 can be coated to adequately reflect or transmit light emitted from the light sources Ll, L2, L3, L4 and L5.
  • Coatings of the partially reflective diagonal surfaces may be standard "DC blue” and "DC red” coatings, as provided by Unaxis.
  • Such a DC blue coating reflects light having a wavelength below 500 nm, i.e. blue light, and transmits light having a wavelength in the range 500-800 nm, i.e. green and red light.
  • the DC red coating reflects light having a wavelength above 650 nm, i.e.
  • red light and transmits light having a wavelength in the range 400-575 nm, i.e. green and blue light.
  • reflection coefficients of these coatings are in the range of 90-95%.
  • these values would be slightly lower. It will be appreciated by a person skilled in the art that other coatings than the two coatings presented here can be used and that the used coatings may cover other reflection and transmission ranges in terms of wavelength.
  • the faces 11, 12, 13, 14, 21, 22, 23 and 24 of the x-cube prisms 10 and 20 may be coated with transmission layers suitable for the selected wavelengths of the light sources Ll, L2, L3, L4 and L5.
  • the front face 14 would preferably be coated with a wide band pass-band filter for transmitting all wavelengths emitted from the light sources Ll, L2, L3, L4 and L5.
  • a beam combiner with one single x-cube prism offers three positions
  • a beam combiner with two x-cube prisms offers five positions
  • a beam combiner with three x-cube prisms would offer seven positions, and so forth.
  • a beam combiner containing more than two x-cube prisms it will be appreciated by the person skilled in that art that several dispositions of the x-cube prisms are possible.
  • each new added light source introduces at least two new interfaces in the light path.
  • each beam produced by a light source will pass through two interfaces only, i.e. faces 21 and 14 for Ll, faces 22 and 14 for L2, faces 24 and 14 for L3, faces 12 and 14 for L4 and faces 13 and 14 for L5.
  • the number of light sources to be added to the beam combiner may, at least theoretically, be unlimited.
  • the x-cube prisms 10 and 20 can be joined together with an index-matching glue, which inhibits light power loss.
  • the light sources Ll, L2, L3, L4 and L5 emit light at 440, 405, 470, 532 and 650 nm, respectively.
  • light sources Ll, L2 and L3 correspond to blue light while light sources L4 and L5 correspond to green and red light, respectively.
  • the diagonal surfaces 15 and 16 of the x-cube prism 10 are coated with the above-described "DC red” and “DC blue” coatings, respectively.
  • the diagonal surface 25 is coated to transmit light having a wavelength below 450 nm and to reflect light having wavelengths in the range 450-700 nm while the diagonal surface 26 is coated to reflect light having a wavelength below 420 nm and to transmit light having wavelengths in the range 420-700 nm.
  • the blue beam 101 entering the x-cube prism 20 through the face 21 is transmitted through the diagonal surfaces 25 and 26 of the x-cube prism 20, and enters the x-cube prism 10 through the faces 23 and 11 of the x-cube prisms 20 and 10, respectively.
  • the blue beam 201 enters the x-cube prism 20 through the face 22. If this blue beam 201 first impinges on the diagonal surface 25 of the x- cube prism 20, it will be transmitted and subsequently impinge on the diagonal surface 26, against which it will be reflected to finally enter the x-cube prism 10 through the faces 23 and 11 of the x-cube prisms 20 and 10, respectively.
  • this blue beam 201 impinges directly on the diagonal surface 26 of the x-cube prism 20, it will be reflected and finally enter the x- cube prism 10 through the faces 23 and 11 of the x-cube prisms 20 and 10, respectively.
  • the blue beam 301 enters the x-cube prism 20 through the face 24 and is reflected against the diagonal surface 25 of the x-cube prism 20 to finally enter the x-cube prism 10 through the faces 23 and 11 of the x-cube prisms 20 and 10, respectively.
  • this blue beam 301 first impinges on the diagonal surface 25 of the x-cube prism 20, it will be transmitted and subsequently be reflected against the diagonal surface 26 of the x-cube prism 20 to finally enter the x-cube prism 10 through the faces 23 and 11 of the x-cube prisms 20 and 10, respectively.
  • the three blue beams 101, 201 and 301 impinge on the diagonal surface 16 of the x-cube prism 10, against which they are reflected, to eventually exit the x-cube prism 10 via the front face 14. If these beams 101, 201, and 301 first impinge on the diagonal surface 15, they will be transmitted and subsequently reflected against the diagonal surface 16 of the x-cube prism 10 to finally exit via the front face 14.
  • the red beam 501 enters the x-cube prism 10 via the face 13 and is then reflected against the diagonal surface 15. If this beam 301 first impinges on the diagonal surface 16, it will be transmitted and subsequently reflected against the diagonal surface 15. In any case, the red beam 301 will eventually exit the x-cube prism 10 through the front face 14, as for the three blue beams 101, 201 and 301.
  • the green beam 401 enters the x-cube prism 10 via the face 12 and is transmitted trough the diagonal surfaces 15 and 16, as these surfaces are arranged to reflect blue and red beams only. This beam 401 eventually exits the x-cube prism 10 via the front face 14. As a result, the blue, green and red beams 101, 201, 301, 401 and 501 are combined together to form an exiting beam 400, which, in this case, would result in a white beam.
  • the light sources of the beam combiner can be regrouped by colour, thus creating e.g. a blue side in the arrangement of x-cube prisms.
  • adding an extra x-cue prism in the arrangement increases the total output power of the beam combiner 1 without having to increase the power of the light sources Ll, L2 and L3.
  • several red light sources of slightly different wavelengths could be added to the arrangement by adding an x-cube prism at the red side of the beam combiner 1.
  • a green side may be provided.
  • one or more of the faces 12, 13, 14, 21, 22 and 24 of the x-cube prisms 10 and 20 are arranged to shape, collimate and focus the exiting beam 400 and the beams of the light sources Ll, L2, L3, L4 and L5.
  • the faces 12, 22 and 24 of the x-cube prisms 10 and 20 are arranged to collimate the light beams 201, 301 and 401 emerging from the light sources L2, L3 and L4, respectively.
  • the faces 13 and 21 could also be arranged to collimate the light beams 101 and 501 emerging from the light sources Ll and L5.
  • the face 14 can be arranged for collimating and shaping the light beam 400 exiting the beam combiner 1 through the front face 14.
  • the faces 12, 13, 14, 21, 22 and 24 of the x-cube prisms 10 and 20 can be curved and may include several different curvatures along horizontal, vertical as well as diagonal directions of each face of the x-cube prisms 10 and 20.
  • each x-cube prism 10 and 20 further reduces the loss of light power as compared to systems comprising a plurality of separate, non- integrated optical components.
  • each mirror or each optical element introduces a power loss of at least 1% per side of the mirror. This means that when three mirrors are used, the system has a power loss of about 6%.
  • Integrating components within the faces 12, 13, 14, 21, 22 and 24 of the x-cube prisms 10 and 20 reduces the number of optical interfaces in the light path and thereby reduces the light power loss.
  • a beam combiner 1 where each light path passes through two interfaces only, for instance faces 21 and 14 for the beam 101, faces 22 and 14 for the beam 201, faces 24 and 14 for the beam 301, faces 12 and 14 for the beam 401, and faces 13 and 14 for the beam 501, which advantageously results in a light power loss of about 2% only.
  • the x-cube prisms 10 and 20 combine the beams, but since the angle of incidence for the light sources Ll, L2, L3, L4 and L5 with respect to the faces 21, 22, 24, 12 and 13, respectively, may be mutually different, only a small portion of a cross-section of the exiting beam 400 would comprise white light.
  • lenses can be arranged at the faces 21, 22, 24, 12 and 13 at which the light sources Ll, L2, L3, L4 and L5 are positioned in order for the incoming beams 101, 201, 301, 401 and 501 to coincide.
  • the integration of lenses at the faces 21, 22, 24, 12 and 13 of the x-cube prisms 20 and 10 reduces the size of the beam combiner 1 considerably in comparison to beam combiners where separate, non-integrated components are used for collimating the incoming beams before entering an x-cube prism.
  • a relatively large distance is required between the light sources and the collimating components, which further increases the size of the beam combiner.
  • the lens incorporated at the front face 14 of the x-cube prism 10 is a liquid crystal lens.
  • a lens enables selective altering of the focus of the exiting beam 400, which enables implementation of illumination systems adapted to both room illumination conditions and reading illumination conditions.
  • alignment of the light sources Ll, L2, L3, L4 and L5 is performed to create a uniform exiting beam 400.
  • the diameter of the cross-section of the exiting beam 400 can be varied by adjusting the distance between the light sources Ll, L2, L3, L4 and L5 and the faces 21, 22, 24, 12 and 13, respectively.
  • the angle and the shape of the exiting beam 400 can be varied.
  • a laser diode usually has an elliptical beam profile.
  • Using different curvatures along e.g. two directions of a face of an x-cube prism and rotating the laser diode so that its orientation matches its light-distributing angle enables alteration of elliptical profile of a beam.
  • the profile of the beam can be narrowed, and an exiting beam having for instance a circular cross-section can be created.
  • Other shapes may be achieved using different designs for the optics, i.e.
  • a Gaussian profile of a diode laser can also be changed to a flattop profile. This could be of interest for illuminating a well-defined area in which each part of the illuminated area needs to be uniformly illuminated.
  • any type of light sources may be used in combination with the x-cube prisms 10 and 20 of the present invention.
  • light emitting diodes or laser diodes are used. These types of light sources are small and therefore enable compact beam combiners.
  • An advantage of using diodes is that they emit light with a narrow beam distribution, thus enabling creation of a narrow exiting beam which can be directed to individual pixel positions on a screen (not shown in the Figures). Therefore, the use of LEDs enables combination of the beam combiner with high resolution imaging devices such as LCD panels or LCOS panels. As compared to LEDs, the use of laser diodes is even more preferable since laser beams per se are collimated.
  • the image stays sharp regardless of the distance between the beam combiner and the display.
  • the use of laser diodes is advantageous for reaching the spectral coverage to which the human eye is sensitive, since laser diodes emit light of separate colours as compared to conventionally used fluorescent materials emitting mixed colours.
  • different wavelengths can be employed in order to obtain a complete light spectrum.
  • the complete visible spectrum to which the human eye is sensitive could virtually be covered.
  • the spectrum may further be extended by changing the individual power of each light source.
  • the light sources Ll, L2, L3, L4 and L5 emit blue, green and red light. These are the three primary colours which, after passing through the x-cube prisms 10 and 20, result in a white exiting beam 400 suitable for projection display systems or illumination applications.
  • a white exiting beam 400 can be obtained by the combination of other colours than blue, green and red.
  • the x-cube prisms 10 and 20 can be manufactured using conventional methods such as grinding and polishing, hot glass pressing and plastic injection moulding.
  • lenses located at the faces 12, 13, 14, 21, 22 and 24 of the x-cube prisms 10 and 20 are directly incorporated during the production process, thus providing a cheap technique to produce the beam combiner. In other cases, these lenses are added later by gluing them onto the faces 12, 13, 14, 21, 22 and 23 of the x-cube prisms 10 and 20 with optical transparent adhesives.
  • a projection display system is realized using a beam combiner of the present invention.
  • a beam combiner equipped with several x-cube prisms having curved faces, lenses and appropriate coatings on their diagonal surfaces and faces, only a scanner mirror is needed to fully realize the projection display system.
  • a projection display system would preferably be provided with light sources such as LEDs or laser diodes since the spatial modulation required to compose the image on the display easily can be controlled by electrical modulation of the LEDs or laser diodes. This is advantageous as compared to systems where the modulation only can be effected in the display device.
  • an illumination system is provided using a beam combiner of the present invention.
  • the present invention is applicable in various display technologies applied in e.g. television sets, computers, automotive industry products and mobile phones and also for lighting applications in which LEDs or laser diodes are used.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

La présente invention concerne un mélangeur de faisceaux (1) comprenant au moins deux prismes à cube x (10, 20) agencés de façon adjacente l'un à l'autre pour combiner la lumière émise à partir de multiples sources de lumière (Ll, L2, L3, L4, L5) dans un faisceau sortant (400). En outre, les faces (12, 13, 14, 21, 22, 24) des prismes à cube x (10, 20) peuvent être agencées pour collimater et former des faisceaux de lumière entrants (101, 201, 301, 401, 501) et le faisceau sortant (400). Un tel mélangeur de faisceaux est très efficace, demande un très faible réglage d'alignement et est très compact.
PCT/IB2007/053532 2006-09-07 2007-09-03 Mélangeur de faisceaux pour sources de lumière multiples Ceased WO2008029337A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06120299 2006-09-07
EP06120299.0 2006-09-07

Publications (1)

Publication Number Publication Date
WO2008029337A1 true WO2008029337A1 (fr) 2008-03-13

Family

ID=38828396

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/053532 Ceased WO2008029337A1 (fr) 2006-09-07 2007-09-03 Mélangeur de faisceaux pour sources de lumière multiples

Country Status (1)

Country Link
WO (1) WO2008029337A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013131709A1 (fr) * 2012-03-08 2013-09-12 Osram Gmbh Dispositif de projection
WO2015155754A1 (fr) * 2014-04-07 2015-10-15 Orbotech Ltd. Système et procédé d'inspection optique
CN111077073A (zh) * 2018-10-19 2020-04-28 深圳迈瑞生物医疗电子股份有限公司 一种样本分析仪
DE102021102254A1 (de) 2021-02-01 2022-08-04 OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung Optoelektronische anordnung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5398081A (en) * 1993-06-07 1995-03-14 Raychem Corporation Apparatus for projecting colored images
US5864374A (en) * 1995-04-04 1999-01-26 Mitsubishi Denki Kabushiki Kaisha Method and apparatus for image generation
US20030025842A1 (en) * 2001-06-26 2003-02-06 Saccomanno Robert J. Projection system utilizing fiber optic illumination
WO2005006720A1 (fr) * 2003-07-14 2005-01-20 Koninklijke Philips Electronics N.V. Projecteur
US20050063196A1 (en) * 2003-06-09 2005-03-24 Wavien, Inc. Light pipe based projection engine
WO2005114264A1 (fr) * 2004-05-14 2005-12-01 3M Innovative Properties Company Element optique multidirectionnel et systeme optique utilisant cet element optique multidirectionnel
WO2006086458A2 (fr) * 2005-02-09 2006-08-17 Wavien, Inc. Combinaison a effacite en etendue de sources de lumiere multiples
WO2006130724A2 (fr) * 2005-05-31 2006-12-07 Infocus Corporation Dispositifs d'eclairement pour sources lumineuses colorees

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5398081A (en) * 1993-06-07 1995-03-14 Raychem Corporation Apparatus for projecting colored images
US5864374A (en) * 1995-04-04 1999-01-26 Mitsubishi Denki Kabushiki Kaisha Method and apparatus for image generation
US20030025842A1 (en) * 2001-06-26 2003-02-06 Saccomanno Robert J. Projection system utilizing fiber optic illumination
US20050063196A1 (en) * 2003-06-09 2005-03-24 Wavien, Inc. Light pipe based projection engine
WO2005006720A1 (fr) * 2003-07-14 2005-01-20 Koninklijke Philips Electronics N.V. Projecteur
WO2005114264A1 (fr) * 2004-05-14 2005-12-01 3M Innovative Properties Company Element optique multidirectionnel et systeme optique utilisant cet element optique multidirectionnel
WO2006086458A2 (fr) * 2005-02-09 2006-08-17 Wavien, Inc. Combinaison a effacite en etendue de sources de lumiere multiples
WO2006130724A2 (fr) * 2005-05-31 2006-12-07 Infocus Corporation Dispositifs d'eclairement pour sources lumineuses colorees

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013131709A1 (fr) * 2012-03-08 2013-09-12 Osram Gmbh Dispositif de projection
DE102012203683B4 (de) 2012-03-08 2022-08-11 Osram Gmbh Projektionsvorrichtung
WO2015155754A1 (fr) * 2014-04-07 2015-10-15 Orbotech Ltd. Système et procédé d'inspection optique
US9599572B2 (en) 2014-04-07 2017-03-21 Orbotech Ltd. Optical inspection system and method
CN111077073A (zh) * 2018-10-19 2020-04-28 深圳迈瑞生物医疗电子股份有限公司 一种样本分析仪
DE102021102254A1 (de) 2021-02-01 2022-08-04 OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung Optoelektronische anordnung

Similar Documents

Publication Publication Date Title
US7234820B2 (en) Illuminators using reflective optics with recycling and color mixing
US7239449B2 (en) Illumination module for color display
US7222968B2 (en) Illumination system with separate optical paths for different color channels
US7905603B2 (en) Substrate-guided display having polarization selective input structure
US7843642B2 (en) Systems and methods for providing compact illumination in head mounted displays
US20090128781A1 (en) LED multiplexer and recycler and micro-projector incorporating the Same
JP5875865B2 (ja) 光出力の輝度を増大するために光をリサイクルする装置、及び、その装置を組み込んだｌｅｄプロジェクタ
US10754162B2 (en) Projection apparatus and head-mounted display device
WO2009091610A9 (fr) Multiplexeur et recycleur de lumière, et micro-projecteur les incorporant
MXPA06013030A (es) Sistema de iluminacion con apertura no radialmente simetrica.
US20100053497A1 (en) Surface illumination device and liquid crystal display using the same
US6773111B2 (en) Projection type image display apparatus
KR20170007805A (ko) 광원 모듈 및 프로젝션 기기
JP2007507755A (ja) ｅｔｅｎｄｕｅを小さく抑えたカラービデオ投写装置に使用する、補正光学系を利用した照明装置
US10288992B2 (en) Laser light source for projector and laser projection device
WO2008029337A1 (fr) Mélangeur de faisceaux pour sources de lumière multiples
US7327521B2 (en) Colored light synthesis element and projection device therewith
US20100060859A1 (en) Projection display with led-based illumination module
WO2008029359A1 (fr) Système de combinaison de faisceaux d'éléments
Zhuang et al. Flat-concave dual-mirror configuration design for upright projection-type ultrashort throw ratio projectors
US20230251558A1 (en) Light source device and projection apparatus
CN120335220A (zh) 液晶投影装置
KR20250018465A (ko) 색 혼합 컴팩트 이미지 프로젝터의 균일도 향상
HK1178593A (en) Multiplexing light pipe having enhanced brightness
KR20050108074A (ko) 조명유니트 및 이를 채용한 화상투사장치

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07826233

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 07826233

Country of ref document: EP

Kind code of ref document: A1