WO2010060143A1 - Système optique d'imagerie critique compacte pour un projecteur d'affichage à cristaux liquides ou un projecteur d'affichage à cristaux liquides sur silicium - Google Patents

Système optique d'imagerie critique compacte pour un projecteur d'affichage à cristaux liquides ou un projecteur d'affichage à cristaux liquides sur silicium Download PDF

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Publication number
WO2010060143A1
WO2010060143A1 PCT/AU2009/001543 AU2009001543W WO2010060143A1 WO 2010060143 A1 WO2010060143 A1 WO 2010060143A1 AU 2009001543 W AU2009001543 W AU 2009001543W WO 2010060143 A1 WO2010060143 A1 WO 2010060143A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
lcos
beamsplitter
reflected
image
Prior art date
Application number
PCT/AU2009/001543
Other languages
English (en)
Inventor
Danny Jung
Original Assignee
Digislide Holdings Limited
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 AU2008906120A external-priority patent/AU2008906120A0/en
Application filed by Digislide Holdings Limited filed Critical Digislide Holdings Limited
Publication of WO2010060143A1 publication Critical patent/WO2010060143A1/fr

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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
    • 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

  • the present invention relates to an optical engine for a projection system and in particular a LCD or LCoS miniature projector with an optical system that uses critical imaging to provide illumination to an LCD or LCoS projector system.
  • a mirror or combination of lenses and mirrors is used together with a polarising beamsplitter to illuminate the LCoS/LCD in a compact configuration.
  • Optical engines for image projection utilising reflective LCoS panels are well known.
  • the engines comprise illumination systems to illuminate an LCoS panel and projection systems to project the image from the panel onto a screen.
  • the illumination system typically has one of three basic configurations.
  • a colour cluster LED emitting light through a concentrator and/or lenses and a polarising beamsplitter, which light is then reflected or transmitted onto a field sequential LCoS panel. Where a field sequential LCoS panel is used the colour LED's are switched in sequence with the image generating electronics system to ensure colour synchronisation.
  • the LCoS panel contains liquid crystals that rotate the polarisation of light, with the amount of rotation controlled by an electric field.
  • the liquid crystals are placed on top of a pixelated highly reflective mirror surface.
  • the mirror is the top layer of a silicon chip which produces the electric field for each pixel.
  • the polarised light is focused on the panel, with the brightness of each pixel controlled by varying the electric field at its location.
  • the light reflected from the LCoS panel is directed through a projection system comprising a projector lens with a focus mechanism, and viewed on an external screen or surface.
  • Telecentricity is a special property of certain multi-element lens designs in which the chief rays for all points across the object or image are collimated. For example, telecentricity occurs when the chief rays are parallel to the optical axis, in object and/or image space. Another way of describing telecentricity is to state that the entrance pupil and/or exit pupil of the system is located at infinity.
  • the present invention successfully addresses these problems by providing a mirror or combination of lenses and mirrors together with a polarising beamsplitter making it possible to use critical imaging to illuminate the LCoS/LCD in a compact configuration.
  • an optical engine apparatus for the production of an image using an LCoS said apparatus including: a light source to emit light, the light passing through a lenslet array and then a pre- polariser adapted to transmit polarised light that can pass through a beamsplitter, a quarter-wave retarder and to a concave mirror that reflects the light back through the retarder adapted to change the direction of polarisation of the light so that it is reflected from the beamsplitter and onto the LCoS where it is reflected so that the reflected light from the LCoS passes through the beamsplitter and then projection lenses to be displayed as an image on a surface.
  • the beamsplitter is a cube beamsplitter.
  • the image is produced using a LCD instead of an LCoS.
  • located before the projection lenses is a post polariser.
  • the pre-polariser transmits p polarised light.
  • a method of producing an image using a LCoS including passing light through a lenslet array and then through a pre-polariser adapted to transmit polarised light that can pass through a beamsplitter and then through a quarter-wave retarder and to a concave mirror that reflects the light back through the retarder adapted to change the direction of polarisation of the light so that it is then reflected from the beamsplitter and onto the LCoS where it is reflected and the direction of polarisation changed so that the reflected light from the LCoS passes through the beamsplitter and then through projection lenses.
  • Figure 1 is a schematic illustration of the optical system embodying the present invention having a LCoS
  • Figure 2 is an alternate embodiment of an optical system of the present invention having a LCoS and where the beamsplitter is a cube beamsplitter;
  • Figure 3 is an alternate embodiment of an optical system of the present invention having a LCoS and where the mirror is a coated surface;
  • Figure 4 is an alternate embodiment of an optical system of the present invention where there is a transmissive LCD panel instead of an LCoS.
  • a light source 10 such as a LED, that with appropriate optics illuminates a lenslet array 12.
  • a prepolariser 14 orientated to transmit polarised light.
  • This polarised light presents itself as p polarised light to the polarising beamsplitter 16 and therefore passes through the beamsplitter 16, a quarter-wave retarder 18 and onto a concave mirror 20.
  • the mirror 20 reflects this light through the retarder 18 a second time to change p polarised light to s polarised light, thereby allowing it to reflect of the beamsplitter 16 and onto the LCoS 22.
  • the LCoS changes s light to p light by the LCoS pixels in their on state and passes through the beamsplitter 16 and projection optics 24 onto the screen (not shown).
  • a post polariser 26 is necessary to block any residual s light directly reflected from the light source by the beamsplitter 16 into the projector lens 24.
  • the advantage of this arrangement is that the entire optical path necessary for the critical imaging method from the lenslet array 12 to the LCoS 22 is contained within the space required for the beamsplitter.
  • the polarising beamsplitter may be a cube beamsplitter 26 which could include lens surfaces on its entry/exit faces as part of its optical design.
  • the concave mirror and quarter- wave retarder 18 could be glued onto the cube beamsplitter.
  • the polarisers 26 may also be glued onto the cube beamsplitter.
  • the mirror 20 could be a coated surface on the retarder.
  • An additional lens 28 would be needed which may be part of the beamsplitter.

Landscapes

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

Abstract

L'invention porte sur un appareil à moteur optique destiné à produire une image à l'aide de cristaux liquides sur silicium. Une source de lumière émet de la lumière qui passe à travers un réseau de petites lentilles puis un prépolariseur qui polarise la lumière de telle sorte qu'elle peut passer à travers un séparateur de faisceau, la lumière passant ensuite à travers un retardateur quart d'onde et sur un miroir concave qui réfléchit la lumière vers le retardateur apte à modifier la direction de polarisation de la lumière de telle sorte que celle-ci est réfléchie par le séparateur de faisceau et sur le projecteur à cristaux liquides sur silicium où elle est réfléchie de telle sorte que la lumière réfléchie par cristaux liquides sur silicium passe à travers le séparateur de faisceau et ensuite les lentilles de projection pour être affichée en tant qu'image sur une surface.
PCT/AU2009/001543 2008-11-26 2009-11-26 Système optique d'imagerie critique compacte pour un projecteur d'affichage à cristaux liquides ou un projecteur d'affichage à cristaux liquides sur silicium WO2010060143A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2008906120 2008-11-26
AU2008906120A AU2008906120A0 (en) 2008-11-26 A compact critical imaging optical system for an LCD or LCOS projector

Publications (1)

Publication Number Publication Date
WO2010060143A1 true WO2010060143A1 (fr) 2010-06-03

Family

ID=42225129

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2009/001543 WO2010060143A1 (fr) 2008-11-26 2009-11-26 Système optique d'imagerie critique compacte pour un projecteur d'affichage à cristaux liquides ou un projecteur d'affichage à cristaux liquides sur silicium

Country Status (1)

Country Link
WO (1) WO2010060143A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113126299A (zh) * 2021-03-10 2021-07-16 北京至格科技有限公司 一种投影光机和头戴式智能设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0389240B1 (fr) * 1989-03-23 1995-08-09 Matsushita Electric Industrial Co., Ltd. Séparateur de faisceaux polarisant et système de projection d'images à valves de lumière
US6273567B1 (en) * 1998-09-14 2001-08-14 Arlie R. Conner Compact multi-path LCD projector
US20070133096A1 (en) * 2005-12-08 2007-06-14 3M Innovative Properties Company Birefringence-compensated liquid crystal display and projection system using same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0389240B1 (fr) * 1989-03-23 1995-08-09 Matsushita Electric Industrial Co., Ltd. Séparateur de faisceaux polarisant et système de projection d'images à valves de lumière
US6273567B1 (en) * 1998-09-14 2001-08-14 Arlie R. Conner Compact multi-path LCD projector
US20070133096A1 (en) * 2005-12-08 2007-06-14 3M Innovative Properties Company Birefringence-compensated liquid crystal display and projection system using same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113126299A (zh) * 2021-03-10 2021-07-16 北京至格科技有限公司 一种投影光机和头戴式智能设备
CN113126299B (zh) * 2021-03-10 2023-02-17 北京至格科技有限公司 一种投影光机和头戴式智能设备

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