WO2006003149A1 - Systeme d’illumination pour imageur et projecteur correspondant - Google Patents
Systeme d’illumination pour imageur et projecteur correspondant Download PDFInfo
- Publication number
- WO2006003149A1 WO2006003149A1 PCT/EP2005/053032 EP2005053032W WO2006003149A1 WO 2006003149 A1 WO2006003149 A1 WO 2006003149A1 EP 2005053032 W EP2005053032 W EP 2005053032W WO 2006003149 A1 WO2006003149 A1 WO 2006003149A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polarizer
- illumination
- polarization
- imager
- sources
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3058—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state comprising electrically conductive elements, e.g. wire grids, conductive particles
-
- 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
- G02B27/285—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 comprising arrays of elements, e.g. microprisms
Definitions
- Illumination system for imager and corresponding projector.
- the invention relates to the field of image projection.
- the invention relates to a system emitting a polarized illumination beam particularly well suited to an imager.
- the projection with LCOS or transmissive liquid crystal imager uses an illumination system with uniform and polarized light.
- the illumination system polarizes an illumination beam from a non-polarized light source and converts the unwanted polarizations.
- conventional systems for this, conventional systems (flye-eye or integrating bar) use a network of PBS (polarized beam splitter of the English "Polariser Beam
- the illumination system comprises a single PBS half-prism (multilayer polarization separator) with a first plate of network of lenses called flye-eye.
- a first polarization is reflected and transmitted to a second lens array.
- a second polarization crosses the half-prism and is reflected on a mirror placed behind the separating surface of the half-prism.
- the second polarization again crosses the half-wave and is returned by a network of blades ⁇ / 2 located on the second lens array plate.
- the invention aims to overcome these disadvantages of the prior art. More particularly, the invention aims to allow a polarized illumination with a system having a high luminous efficiency.
- the invention proposes an illumination system intended to illuminate an imager, the system comprising a plurality of illumination sources each generating illumination beams, called beams. sources, comprising first and second distinct polarizations.
- the system is remarkable in that it further comprises a grid polarizer illuminated by the source beams, a mirror, and half-wavelength phase shift means; the first polarization of each of said source beams passes through the polarization surface of the polarizer, before being reflected by the mirror and traversing again the polarization surface of the polarizer; the second polarization of each of the source beams is reflected by the polarization surface of the polarizer; only one of the first or second polarizations crossing the phase shift means after crossing or reflection on the polarization surface, the first and second polarizations of the source beams being separated spatially.
- the system is remarkable in that it comprises a light guide and a main light source, the illumination sources being obtained by transmitting, through the light guide, an illumination beam generated by the main light source.
- the light guide is an integrating bar.
- the system is remarkable in that it comprises a plurality of light-emitting diodes, each of the diodes being associated with one of the illumination sources.
- the reflecting surface of the mirror is parallel to the polarization surface of the polarizer.
- the grid polarizer comprises a transparent substrate, one face forms the polarization surface of the polarizer and the other side forms the reflecting surface of the mirror.
- the illumination system comprises a first lens group comprising at least one focusing lens situated between the illumination sources and the polarizer, the phase-shifting means being situated in a plane placed between the two focusing planes of the sources of illumination. illumination by the first group, each of the two focusing planes corresponding to either the first polarization or the second polarization.
- the illumination system comprises a second group of lenses and the imager placed in a first plane of focus of the second group of lenses, the second plane of focusing of the second lens group being placed between the two focusing planes of the illumination sources by the first group.
- the phase-shift means comprise a substrate, one of the faces of which has half-wavelength phase-shift bands.
- the invention also relates to a projector comprising:
- FIG. 1 illustrates a backlighting device implementing an illumination system of an imager, according to a particular embodiment of the invention
- FIGS. 2 and 3 show the illumination system of FIG. 1;
- FIGS. 2 and 3 schematically describe illumination beams implemented in the system of Figures 2 and 3;
- FIG. 6 shows a polarization separation implemented in the system of FIGS. 2 and 3;
- FIG. 7 illustrates the distribution of the sources before the polarization separation presented with reference to FIG. 6;
- FIG. 8 illustrates the image of the sources after the polarization separation presented with reference to FIG. 6;
- FIG. 9 and 10 show alternative embodiments of the polarizer implemented in the system of Figures 2 and 3.
- FIG. 1 illustrates a retro-projector 1 implementing an illumination system 10 of an imager 16, according to a particular embodiment of the invention.
- the overhead projector 1 comprises:
- a projection lens 11 transmitting an imaging beam produced by the imager 16;
- the backlight can be more or less narrow. Nevertheless, because of the small size of the illumination system 10 and the illumination beam being folded, the invention is particularly well suited to thin-walled projectors (for example 6 or 9 inches thick). Of course, the invention also applies to wider backlights (with, for example, a single folding mirror) and front projectors.
- Figures 2 and 3 show the illumination system 1 respectively in a side view and in perspective illuminating an imager
- LCD type liquid crystal display, "Liquid Crystal”
- the imager 16 has a width // and a height hi which depends on the format of the image to be projected.
- the illumination system 1 comprises: a plurality of light sources of unpolarized light
- a second lens 22 (or a group of several lenses), of focal length F1;
- phase-shifting means of half a wavelength for example in the form of ⁇ / 2 bands placed on a transparent substrate 26 (for example made of glass), the strips
- the grid polarizer 23 is for example provided by the company
- MOXTEK ® a face corresponding to the polarization surface, the other face being, for example, treated to be reflective.
- the magnification of the lens 22 is equal to G1 (plane of the strips 25 with respect to the entry plane of the guide 21).
- the ⁇ / 2 bands are achromatic on the visible spectral zone: the delay varies with the wavelength so that the difference between the indices, ordinary and extraordinary, respectively, is equal to a half-wavelength divided by the thickness of the bands 25 on the visible spectral zone.
- the ⁇ / 2 bands have a constant or substantially constant delay on the visible spectral zone.
- the ⁇ / 2 bands phase out by half a wavelength a precise frequency of the visible spectral zone; preferably, this frequency is the middle frequency of the visible spectrum.
- the plurality of light sources is generated by means of a lamp-type main light source 20 and of a light guide (in English "light pipe") of height h, length L and depth p.
- the light sources are thus obtained by transmission through the light guide of a source illumination beam produced by the main light source.
- the light guide is, for example, a solid integrator bar or a hollow guide with reflective walls.
- the illumination system illuminates the imager 16 operating with a polarized illumination beam.
- the imager is of the LCOS type (Liquid Crystal on Silicon of the English "Liquid
- a polarizer is placed in the path of the polarized illumination beam before the imager in order to purify the polarization and improve the contrast.
- FIGS. 4 and 5 schematically describe illumination beams implemented in the system 10, respectively vertically and horizontally polarized.
- the lamp 20 illuminates the entrance of the light guide 21 located parallel to an axis z, its height and depth being parallel to an axis respectively x and y.
- several virtual sources are present forming a network with several lines and several columns.
- the first lens 22 images the input of the guide 21 in a plane close to the ⁇ / 2 bands 25 and the output of the guide 21 to infinity (the distance between the lens 22 and the output of the guide is equal to F1).
- several virtual sources corresponding to the sources present at the entrance of the guide 21 appear.
- three sources 40 to 42 have been represented at the entrance of the guide 21 in FIGS. 4 and 5.
- FIG. 7 which represent the virtual sources placed in input of the guide, the latter are separated by a distance h along the x axis and a distance p along the y axis. Each of these virtual sources emits unpolarized light.
- the number of sources depends on the opening angle of the lamp which defines the number of reflection of the beam in the guide 21.
- the virtual sources form a network of at least three lines and three columns.
- the grid polarizer 23 located behind the first lens 22 in the path of the illumination beam separates the vertical polarization and the horizontal polarization.
- the grid polarizer is inclined at an angle preferably equal to 45 ° with respect to the z axis of propagation of the illumination beam.
- the polarizer grid is oriented in the x direction, perpendicular to the plane of propagation defined by the y and z axes.
- the vertical polarization of the illumination beam is reflected along the y direction.
- the horizontal polarization passes through the polarization surface and the substrate of the polarizer 23.
- the vertical polarization then crosses the substrate 26 outside the blades 25 and the second lens 27 which images the output of the guide 21 on the imager 16.
- the horizontal polarization is reflected by the mirror 24 parallel to the polarization surface of the polarizer 23 and placed at a distance e from this surface. Then, the horizontal polarization of the illumination beam crosses again the polarizer 23 and hits the blades 25 which turns the polarization which becomes vertical.
- the illumination beam thus comprises only the vertical polarization obtained by direct transmission of the vertical polarization at the output of the guide 21 and by reversal of the horizontal polarization. This optimizes the use of the illumination beam.
- the grid of the polarizer is oriented perpendicularly to the direction x. It is then the horizontal polarization of the illumination beam which is reflected; according to this variant, the vertical polarization passes through the polarization surface.
- the illumination beam thus comprises only the horizontal polarization (if the blades or strips 25 are positioned in the same place).
- the substrate is the glass slide 26 which carries the half wave plates 25.
- each of the columns is separated by a distance G1.p / 2, an alternate column corresponding to the part of the illumination beam reflected by the polarizer 23 and the other columns corresponding to the part of the illumination beam reflected by the mirror 24.
- the dimension of the plane of the bands 25 (or substrate 26) is such that it collects at least six columns of sources, the number of lines depending on the number of lines. Even more preferably, the dimension of the substrate 26 is such that it collects at least eight columns of sources. The dimension of the substrate is larger than the opening of the objective through to the lens 27.
- Figure 6 illustrates in detail the path of a beam 60 of the illumination beam striking the polarizer 23.
- the incident ray 60 makes an angle ⁇ ext with the normal to the separation surface of the polarizer 23.
- the incident ray 60 is, in part, reflected by the polarization surface to form a vertical polarization ray 61 and partly refracted for forming a horizontal polarization beam 62.
- the ray 62 is reflected by the mirror 24 to form a ray 63 which itself is refracted by the polarization surface to form a ray 64.
- the polarization surface of the polarizer 23 and the mirror 24 are separated by a material of optical index n with a thickness e.
- the substrate 26 includes ⁇ / 2 phase shift strips 25 parallel to the x axis which change the polarization. Each of the strips is separated from a band close to the distance d and is itself of width d.
- the ray 61 passes through the substrate 26 without passing through the strips 25 and so that, on the other hand, the ray 64 passes through the strips 25 so that its polarization is modified then the second lens 27 which images the exit of the guide 21 on the imager 16.
- the strips 25 are placed in the path of the polarization which is reflected by the polarization surface of the polarizer 23, the polarization which passes through this surface does not illuminate the strips 25.
- the polarization of the illumination beam at the output of the substrate 26 is horizontal or vertical.
- Imager 16 must be oriented correctly according to the polarization of the illumination beam which illuminates it.
- the virtual sources placed at the entrance of the guide 21 focus through the first lens 22 on two planes 65 and 67 slightly offset as a function of the polarization of the rays striking the polarizer 23:
- the distances separating the lens 27 and the plane of the strips 25, on the one hand, and the imager 16, on the other hand, are equal to the focal length F2: More precisely, the imager 16 is located in a foreground focusing the lens 27; the second plane of focus of the lens 27 is located between the planes 65 and 67 of focusing of the lens 22, and preferably in the median plane of the planes 65 and 67. In this way, the illumination on the imager is optimized.
- angle Qext is preferably between 30 and
- the grid polarizer has the advantage of conferring a little sensitive contrast to the angles of incidence. Even more preferentially, the angle Qext equal to 45 °
- the geometry of the illumination system also makes it possible to bend the illumination beam, which limits its bulk (especially in the frame for use in a headlamp or in a narrow backlight).
- the value of Qext may therefore advantageously be chosen as a function of the constraints of space specific to the projection apparatus in question.
- the size of the substrate 26 is hs along the axis x and // along the y axis.
- the size of the substrate 26 is chosen as a function of the number of virtual sources illuminating it.
- the parameters of the illumination system may be as follows:
- the dimensions of the guide are generally fixed in part by the format of the imager (3/4 or 16/9 th for example), the size of the focus of the lamp to have a good collection and the dimensions of the imager for have a magnification of about 2 (other magnifications are possible).
- a guide of small section allows to work with constant extension with large angles (typically between 15 ° and 25 °).
- the lamp 20 can be relatively powerful. Indeed, unlike PBS polarizers, the grid polarizer 23 is resistant to high light fluxes.
- such a polarizer also has the advantage of providing a low sensitivity contrast wavelengths.
- FIG. 9 illustrates a polarizer 90 that can be used, according to the invention, to replace the polarizer 23 and the mirror 24.
- the polarizer 90 comprises a grid polarizer 91 similar to the polarizer 23 and a substrate 92, for example, glass covered with a reflecting surface 93 on one of its faces.
- FIG. 10 illustrates a polarizer 95 which can also be used, according to the invention, to replace the polarizer 23 and the mirror 24.
- the polarizer 95 comprises a grid polarizer 96 similar to the polarizer 23 and a substrate 98, for example, made of glass.
- the substrate 98 and the polarizer 96 are separated by a thin layer of air 97.
- the substrate 98 is covered with a reflecting surface 99 on one of its faces, which is preferably that common with the air layer 97.
- the invention is not limited to the embodiments described above.
- the invention in particular relates to different types of projectors using an illumination beam with polarized light, including backlights or headlamps.
- these projectors include or not one or more flat or curved folding mirrors.
- the illumination system is positioned or oriented in different ways with respect to the imager. According to a preferred variant, it can in particular be rotated or 180 ° along the axis of the imaging beam that illuminates the imager. In the context of a projection on a 4/3 or 16/9 screen, or more generally when one dimension is larger than the other, the duplication of the sources is preferentially done according to the largest dimension. According to other variants, the rotation is equal to +/- 90 °. It may also be more or less distant from the projection lens, the projection lens being adapted to the overall geometry of the projector structure; the objective makes it possible, in particular, to focus an image produced by the imager on the screen by limiting the distortions.
- the projection objective is preferably as close as possible to the illumination system.
- the plurality of light sources is obtained using a plurality of LEDs (light emitting diodes), each of the LEDs corresponding to a light source.
- each of the LEDs is associated with optical means for uniformly illuminating the imager: it may be a reflector or collimation means or appropriate collection.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/630,006 US20080024728A1 (en) | 2004-07-02 | 2005-06-28 | Imager Illumination System and Corresponding Projector |
JP2007518609A JP2008507717A (ja) | 2004-07-02 | 2005-06-28 | イメージャの照明系及び対応する投射器 |
EP05758665A EP1763696A1 (fr) | 2004-07-02 | 2005-06-28 | Systeme d'illumination pour imageur et projecteur correspondant |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR04/51427 | 2004-07-02 | ||
FR0451427A FR2872588A1 (fr) | 2004-07-02 | 2004-07-02 | Systeme d'illumination pour imageur et projecteur correspondant |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006003149A1 true WO2006003149A1 (fr) | 2006-01-12 |
Family
ID=34946039
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/053032 WO2006003149A1 (fr) | 2004-07-02 | 2005-06-28 | Systeme d’illumination pour imageur et projecteur correspondant |
Country Status (6)
Country | Link |
---|---|
US (1) | US20080024728A1 (fr) |
EP (1) | EP1763696A1 (fr) |
JP (1) | JP2008507717A (fr) |
CN (1) | CN1977208A (fr) |
FR (1) | FR2872588A1 (fr) |
WO (1) | WO2006003149A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102402017A (zh) * | 2010-09-08 | 2012-04-04 | 华新丽华股份有限公司 | 偏振光转换系统 |
CN103713451B (zh) | 2012-09-28 | 2016-06-22 | 扬明光学股份有限公司 | 多重投影系统以及使用该系统的显示系统 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5751480A (en) * | 1991-04-09 | 1998-05-12 | Canon Kabushiki Kaisha | Plate-like polarizing element, a polarizing conversion unit provided with the element, and a projector provided with the unit |
EP1003064A1 (fr) * | 1998-06-04 | 2000-05-24 | Seiko Epson Corporation | Dispositif d'eclairage, dispositif optique et affichage a cristaux liquides |
US6139157A (en) * | 1997-02-19 | 2000-10-31 | Canon Kabushiki Kaisha | Illuminating apparatus and projecting apparatus |
US6190013B1 (en) * | 1997-07-03 | 2001-02-20 | Minolta Co., Ltd. | Polarized beam splitter and an illumination optical system and a projector provided with a polarized beam splitter |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7387388B2 (en) * | 2004-04-15 | 2008-06-17 | Jds Uniphase Corporation | Illumination system using polarization conversion |
-
2004
- 2004-07-02 FR FR0451427A patent/FR2872588A1/fr active Pending
-
2005
- 2005-06-28 EP EP05758665A patent/EP1763696A1/fr not_active Withdrawn
- 2005-06-28 US US11/630,006 patent/US20080024728A1/en not_active Abandoned
- 2005-06-28 WO PCT/EP2005/053032 patent/WO2006003149A1/fr not_active Application Discontinuation
- 2005-06-28 JP JP2007518609A patent/JP2008507717A/ja not_active Withdrawn
- 2005-06-28 CN CNA2005800216607A patent/CN1977208A/zh active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5751480A (en) * | 1991-04-09 | 1998-05-12 | Canon Kabushiki Kaisha | Plate-like polarizing element, a polarizing conversion unit provided with the element, and a projector provided with the unit |
US6139157A (en) * | 1997-02-19 | 2000-10-31 | Canon Kabushiki Kaisha | Illuminating apparatus and projecting apparatus |
US6190013B1 (en) * | 1997-07-03 | 2001-02-20 | Minolta Co., Ltd. | Polarized beam splitter and an illumination optical system and a projector provided with a polarized beam splitter |
EP1003064A1 (fr) * | 1998-06-04 | 2000-05-24 | Seiko Epson Corporation | Dispositif d'eclairage, dispositif optique et affichage a cristaux liquides |
Non-Patent Citations (1)
Title |
---|
HANSEN D ET AL: "INVITED PAPER: THE DISPLAY APPLICATIONS AND PHYSICS OF THE PROFLUX WIRE GRID POLARIZER", 2002 SID INTERNATIONAL SYMPOSIUM DIGEST OF TECHNICAL PAPERS. BOSTON, MA, MAY 21 - 23, 2002, SID INTERNATIONAL SYMPOSIUM DIGEST OF TECHNICAL PAPERS, SAN JOSE, CA : SID, US, vol. VOL. 33 / 1, 21 May 2002 (2002-05-21), pages 730, XP009029129 * |
Also Published As
Publication number | Publication date |
---|---|
JP2008507717A (ja) | 2008-03-13 |
FR2872588A1 (fr) | 2006-01-06 |
CN1977208A (zh) | 2007-06-06 |
US20080024728A1 (en) | 2008-01-31 |
EP1763696A1 (fr) | 2007-03-21 |
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