WO2009087396A1 - Système d'affichage par projection - Google Patents

Système d'affichage par projection Download PDF

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Publication number
WO2009087396A1
WO2009087396A1 PCT/GB2009/000065 GB2009000065W WO2009087396A1 WO 2009087396 A1 WO2009087396 A1 WO 2009087396A1 GB 2009000065 W GB2009000065 W GB 2009000065W WO 2009087396 A1 WO2009087396 A1 WO 2009087396A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
imager
optical components
disc
array
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/GB2009/000065
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English (en)
Inventor
Nigel Copner
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.)
UWS Ventures Ltd
Original Assignee
UWS Ventures Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UWS Ventures Ltd filed Critical UWS Ventures Ltd
Publication of WO2009087396A1 publication Critical patent/WO2009087396A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04N9/3161—Modulator illumination systems using laser light 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]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators

Definitions

  • This invention relates generally to a projection display system.
  • a projection display system is an image display system that is used to enlarge and project images onto a projection screen.
  • Projection display systems are used in, for example, home theatres, projection televisions, large panel displays, etc.
  • a projection display system has two main components, namely, an illumination system and an imaging system.
  • the illumination system has a light source and other optical components that alter the spatial distribution of the light emitted by the light source.
  • the imaging system includes an imager and a projection lens.
  • the imager spatially modulates the light emitted by the illumination system.
  • the spatial modulation by the imager incorporates the image information required for creating an image in the light emitted by the illumination system, by transmitting the light through, for example, a liquid crystal display (LCD) imager.
  • LCD liquid crystal display
  • the light, thus modulated, may pass through one or more intermediate components before being made incident on a projection lens.
  • the projection lens projects the image displayed on the imager to form an enlarged image on a projection screen.
  • Non-collimated light sources that have a large etendue, where etendue is a property of an optical system which characterises how "spread out" the light is in area and angle. This is because non-collimated light does not have a high concentration of optical energy and spreads to varying degrees while travelling through space, especially through the above-mentioned intermediate optical components.
  • Another shortcoming of existing projection systems is their relatively large size. Due to the use of non-collimated light propagation, the optical components are configured to . have a relatively large size. Furthermore, due to the large physical dimensions of the optical components placed between the imager and the projection lens, the projection lens requires a relatively large back focal length. This large back focal length, in turn, increases the size of the projection system, degrades the image quality and reduces the projection efficiency.
  • a projection display system comprising an illumination system and an imaging system, the illumination system being configured to illuminate said imaging system with a substantially collimated light source, the imaging system comprising an imager for modulating said collimated light so as to incorporate image data therein, said image data relating to a plurality of pixels, the imaging system further comprising an array of optical components for receiving modulated light from said imager and being moveable relative thereto, such that, in use and during movement of said array of optical components relative to said modulated light from said imager, each pixel of said modulated light is scanned by one or more of said optical components to generate a respective divergent of light for transmission toward a target projection plane.
  • the light source comprises a laser.
  • the array of optical components may comprise an array of micro lenses, possibly arranged in a set of spirals, from an outer to an inner location on a disc or similar structure.
  • the microlenses in each spiral are optionally diametrically substantially equidistant.
  • the disc may be rotatable relative to said modulated light from said imager, preferably about the axis defined by the light path thereof.
  • Figure 1 is a schematic representation of the principal components of a projection display system according to an exemplary embodiment of the present invention.
  • a laser 2 having an outlet 3 through which light passes.
  • the light then passes through a collimating lens 4 thereby substantially collimating the light.
  • the collimated light then passes through a spatial light modulator (SLM) 6 which is an object that imposes some form of spatially varying modulation on a beam of light.
  • SLM spatial light modulator
  • An example can be an overhead projector transparency or as previously described a liquid crystal display imager.
  • the light is then incident on a rotating body, beneficially a disc having a plurality of lenses thereon.
  • the axis of rotation 10 of the disc is positioned out of the light beam to remove interference of the components suitable for making the disc rotate when in use.
  • the disc is also shown in an end view showing the appearance of the disc onto which the light is incident.
  • a plurality of micro lenses are provided which in one embodiment may be fixed to a backing material or alternatively in the preferred embodiment are fixed in a side by side configuration with no backing material on the portion of the disc comprising the lenses. It will be appreciated that there is no requirement to provide lenses for the portion of the disc surrounding the axis of rotation 10 as no light will pass through this portion of the disc.
  • the schematic representation of Figure 1 only shows a limited number of micro lenses, however, it will be appreciated that this configuration of lenses extends around the entire disc.
  • Reference numeral 12 indicates the microlenses.
  • the disc is arranged to rotate in a direction indicated by arrow 14, although by rotating the disc in the other direction the same scanning effect may be achieved.
  • the substantially collimated light is transmitted through the SLM which has the effect that the contrast is enhanced and there is no etendue related loss of light. Furthermore, polarisation effects are minimised.
  • the laser light is therefore substantially collimated through most of the system and only becomes image quality after passing through the plurality of lenses on the disc.
  • each of the plurality of microlenses moves up and across each pixel of the SLM image such as to create a cone of emitted light from each pixel.
  • the effect that this produces is an arced scan of the SLM image, very similar to a traditional Nipkow disc used in the first television sets of Logie Baird.
  • the effects are achieved through the use of microlenses and the repeating set of lenses around the disc at varying radii from the axis of rotation ensure that the throughput of the disc is significantly improved compared to previous methods.
  • the disc is rotated extremely quickly (of the order of several thousand RPM) which is fast relative to a person's eye response speed.
  • the emitted cone from each pixel therefore looks very similar to the natural cone emitted from a real object, since the eye cannot distinguish the separate images and can be effectively imaged onto a projection screen 18 via a projection imaging lens 16.
  • the microlenses may be of approximate diameter corresponding to that of a pixel, for example the microlense may be of the order of 40 microns.
  • the microlenses may be uniformly located such that they do not employ a Nipkow disc, however two rotating microlenses would then be required to effectively scan a true cone of emittance, whereby one effectively rotates upwards and one effectively rotates across the pixel image.
  • the microlenses have been shown as being tra ⁇ smissive however could be of a reflective type such a curved reflector.
  • the speckle effect associated with lasers arises through the interference of the many waves within a light field having different phases, which add together to give a resultant wave whose amplitude varies randomly.
  • the material of the projection surface is carefully selected to ensure that it is sufficiently smooth such as to limit the creation of path length differences of incident light that give rise to a change in the phase of a wave in the light field.
  • An advantage of the present invention is that the laser light is collimated when it passes through the SLM. Further to this the throughput of light through the disc is high compared with previous scanning methods and this results in more photons forming the image on the screen. Both the non-dispersive properties of the light through the SLM and the increase of photons permitted through the disc significantly enhance the quality of the image that results on the projection screen.
  • the laser safety requirements of the projection display system can be reduced to that of a standard lamp since the laser light through each image pixel is effectively rotated through a cone of emittance in time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

L'invention porte sur un système d'affichage par projection comprenant un système d'éclairage et un système d'imagerie, le système d'éclairage étant configuré pour éclairer ledit système d'imagerie avec une source de lumière sensiblement collimatée, telle qu'un laser, le système d'imagerie comprenant un imageur pour moduler ladite lumière collimatée de façon à y incorporer des données d'image, lesdites données d'image étant relatives à une pluralité de pixels, le système d'imagerie comprenant en outre un réseau de composants optiques, tels qu'un disque comprenant un réseau de microlentilles, pour recevoir la lumière modulée provenant dudit imageur et pouvant tourner par rapport à celui-ci autour d'un axe défini par le trajet de lumière de celui-ci, de sorte que, lors de l'utilisation et durant un mouvement dudit réseau de composants optiques par rapport à ladite lumière modulée provenant dudit imageur, chaque pixel de ladite lumière modulée est balayé par un ou plusieurs desdits composants optiques afin de générer une divergence respective de lumière pour une transmission vers un plan de projection cible.
PCT/GB2009/000065 2008-01-09 2009-01-09 Système d'affichage par projection Ceased WO2009087396A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0800461.6 2008-01-09
GBGB0800461.6A GB0800461D0 (en) 2008-01-09 2008-01-09 Projection display system

Publications (1)

Publication Number Publication Date
WO2009087396A1 true WO2009087396A1 (fr) 2009-07-16

Family

ID=39144759

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2009/000065 Ceased WO2009087396A1 (fr) 2008-01-09 2009-01-09 Système d'affichage par projection

Country Status (2)

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GB (1) GB0800461D0 (fr)
WO (1) WO2009087396A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103941278A (zh) * 2014-05-13 2014-07-23 中国工程物理研究院流体物理研究所 一种电子束发射度测量装置及测量方法
WO2019187832A1 (fr) * 2018-03-28 2019-10-03 横河電機株式会社 Dispositif d'éclairage optique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996003676A1 (fr) * 1994-07-25 1996-02-08 Proxima Corporation Systeme de projection d'images et son procede d'utilisation
JPH1164789A (ja) * 1997-08-15 1999-03-05 Sony Corp レーザディスプレイ装置
US6081381A (en) * 1998-10-26 2000-06-27 Polametrics, Inc. Apparatus and method for reducing spatial coherence and for improving uniformity of a light beam emitted from a coherent light source
JP2005003694A (ja) * 2003-04-14 2005-01-06 Nano Photon Kk 複数の光透過ドットを備えるアレイ基板の設計方法、アレイ基板、レーザ光走査装置、レーザ顕微鏡
WO2006043237A1 (fr) * 2004-10-22 2006-04-27 Koninklijke Philips Electronics N.V. Systeme de projecteur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996003676A1 (fr) * 1994-07-25 1996-02-08 Proxima Corporation Systeme de projection d'images et son procede d'utilisation
JPH1164789A (ja) * 1997-08-15 1999-03-05 Sony Corp レーザディスプレイ装置
US6081381A (en) * 1998-10-26 2000-06-27 Polametrics, Inc. Apparatus and method for reducing spatial coherence and for improving uniformity of a light beam emitted from a coherent light source
JP2005003694A (ja) * 2003-04-14 2005-01-06 Nano Photon Kk 複数の光透過ドットを備えるアレイ基板の設計方法、アレイ基板、レーザ光走査装置、レーザ顕微鏡
WO2006043237A1 (fr) * 2004-10-22 2006-04-27 Koninklijke Philips Electronics N.V. Systeme de projecteur

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103941278A (zh) * 2014-05-13 2014-07-23 中国工程物理研究院流体物理研究所 一种电子束发射度测量装置及测量方法
CN103941278B (zh) * 2014-05-13 2016-08-24 中国工程物理研究院流体物理研究所 一种电子束发射度测量装置及测量方法
WO2019187832A1 (fr) * 2018-03-28 2019-10-03 横河電機株式会社 Dispositif d'éclairage optique
JP2019174586A (ja) * 2018-03-28 2019-10-10 横河電機株式会社 照射光学装置
EP3779556A4 (fr) * 2018-03-28 2021-12-22 Yokogawa Electric Corporation Dispositif d'éclairage optique
JP7056306B2 (ja) 2018-03-28 2022-04-19 横河電機株式会社 照射光学装置
US11506880B2 (en) 2018-03-28 2022-11-22 Yokogawa Electric Corporation Optical illumination device

Also Published As

Publication number Publication date
GB0800461D0 (en) 2008-02-20

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