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WO2002004994A2 - PROCEDE ET SYSTEME PERMETTANT D'OBTENIR UN ENSEMBLE DE CONSTITUANT DE PRISME - Google Patents

PROCEDE ET SYSTEME PERMETTANT D'OBTENIR UN ENSEMBLE DE CONSTITUANT DE PRISME Download PDF

Info

Publication number
WO2002004994A2
WO2002004994A2 PCT/US2001/022226 US0122226W WO0204994A2 WO 2002004994 A2 WO2002004994 A2 WO 2002004994A2 US 0122226 W US0122226 W US 0122226W WO 0204994 A2 WO0204994 A2 WO 0204994A2
Authority
WO
WIPO (PCT)
Prior art keywords
laminating
assembling
prism
stacks
image path
Prior art date
Application number
PCT/US2001/022226
Other languages
English (en)
Inventor
Inc. Digital Reflection
Edmund Sandberg
Mike Detro
Warn Burt
Arthur L. Berman
Chris Gatt
Vicki Mercer
Kenton Whitaker
Original Assignee
Digital Reflection Inc
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 Digital Reflection Inc filed Critical Digital Reflection Inc
Priority to AU80553/01A priority Critical patent/AU8055301A/en
Publication of WO2002004994A2 publication Critical patent/WO2002004994A2/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • 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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/1805—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for prisms

Definitions

  • the present invention relates to microdisplay based light train for video projection applications. More particularly, the present invention relates to method and system for providing a high volume prism assembly procedure for light management system in microdisplay based light train for video projection systems.
  • the operation of the light management system begins with a beam of white light channeled on to the input face such as the input surface of the prism assembly in the light management system.
  • the channeled white light is then separated into polarized red, green and blue components which are then directed to a respective one of three microdisplays in the light management system.
  • the component light beams are then modulated by the image information on the respective microdisplays, reflected and then recombined.
  • the modulated white light then exits through the output face such as the output surface of the prism assembly of the light management system to be projected as an image onto a screen.
  • the prism assembly may be constructed with numerous components requiring efficient and precise assembly.
  • the prism assembly needs to be assembled quickly, with the required dimensional accuracy, and without visual defects such as air bubbles especially in the optical path of the light beam, such that the various components of the prism assembly are firmly attached and assembled. That the individual prism components have their unique dimensional tolerances which need to be accommodated during the assembly process adds to the difficulty in the high volume, relatively defect free manufacturing of prism assembly for the light train configurations used in video projection systems.
  • the star prism assembly due to its optical design, various mechanical tolerances need to be considered. Indeed, the first tolerance applies to the outside dimensions of the prism assembly which is allowed to fall within a range that has a relatively "loose” tolerance. The next mechanical tolerance relates to the optical path lengths internal to the prism assembly, and in particular, to the distance from the prism assembly faces at the location of the three microdisplays to the output face of the prism assembly. These distances must fall within a "tight" tolerance. Indeed, during the assembly process, the various mechanical tolerances discussed above must be considered and addressed to achieve high volume, star prism assembly manufacturing.
  • a method for assembling a prism for use in a microdisplay based light train includes assembling a plurality of stacks, assembling a plurality of beamsplitting cubes, laminating the plurality of stacks to a corresponding one of the plurality of beamsplitting cubes, and assembling a prism configuration after the laminating step.
  • the step of assembling the plurality of stacks may further include laminating a green dichroic layer to a reflective polarizer layer, laminating a magenta dichroic layer to a blue/yellow waveplate, laminating a red/blue waveplate to a first spacer glass layer, and laminating a half waveplate to a second spacer glass layer.
  • the step of assembling the plurality of beamsplitting cubes may further include the step of laminating a plurality of first triangular units to a plurality of second triangular units.
  • each of the plurality of beamsplitting cubes may be polarized.
  • the prism configuration assembling step may include the steps of forming an image path subassembly, and laminating an input subassembly to the image path subassembly.
  • the image path subassembly may include an output surface of the prism assembly and an input surface of the prism assembly.
  • the method may further include the step of applying an anti-reflection coating on the input and output surfaces of the prism assembly, the step of matching optical path lengths of an image path, as well as the step of applying an adhesive to said plurality of stacks, where the applying step may include the step of varying a thickness of the adhesive such that the optical path lengths of an image path are substantially matched.
  • the adhesive may be a layer of glue, while the optical path lengths are matched to be substantially identical.
  • a method for assembling a prism for use in a microdisplay based light train in accordance with another embodiment of the present invention includes assembling a plurality of stacks, assembling a plurality of polarized beamsplitting cubes, the step of assembling the plurality of beamsplitting cubes including the step of laminating a plurality of first triangular units to a plurality of second triangular units, laminating the plurality of stacks to a corresponding one of the plurality of beamsplitting cubes, and assembling a prism configuration after the laminating step.
  • a method for assembling a prism for use in a microdisplay based light train in accordance with yet another embodiment of the present invention includes assembling a plurality of stacks, laminating a plurality of first triangular units to a plurality of second triangular units to form a plurality of polarized beamsplitting cubes, laminating the plurality of stacks to a corresponding one of the plurality of beamsplitting cubes, forming an image path subassembly, and laminating an input subassembly to the image path subassembly.
  • a system for assembling a prism for use in a microdisplay based light train in accordance with still another embodiment of the present invention includes means for assembling a plurality of stacks, means for assembling a plurality of beamsplitting cubes, means for laminating the plurality of stacks to a corresponding one of the plurality of beamsplitting cubes, means for assembling a prism configuration based on the laminating means.
  • the means for assembling the plurality of stacks may include means for laminating a green dichroic layer to a reflective polarizer layer, means for laminating a magenta dichroic layer to a blue/yellow waveplate, means for laminating a red/blue waveplate to a first spacer glass layer, and means for laminating a half waveplate to a second spacer glass layer.
  • the means for assembling the plurality of beamsplitting cubes may include means for laminating a plurality of first triangular units to a plurality of second triangular units.
  • each of the plurality of beamsplitting cubes may be polarized.
  • means for assembling the prism configuration assembling may include means for forming an image path subassembly, and means for laminating an input subassembly to the image path subassembly.
  • the image path subassembly may include an output surface of the prism assembly and an input surface of the prism assembly.
  • system may further include means for coating an anti-reflection layer on the input and output surfaces of the prism assembly, as well as means for matching optical path lengths of an image path.
  • an adhesive layer such as glue may be provided to the plurality of stacks, where the thickness of the adhesive may be varied such that the optical path lengths of an image path are substantially matched.
  • Figure 1 illustrates a star prism configuration for a microdisplay based light train in video projection application in accordance with one embodiment of the present invention.
  • Figure 2 illustrates the components of the star prism configuration of Figure 1 in the sequence of assembly in accordance with one embodiment of the present invention.
  • Figure 3 illustrates a flowchart for assembling the star prism configuration of Figure 1 in accordance with one embodiment of the present invention.
  • Figure 4 illustrates the star prism configuration of Figure 1 including the input and output optical path in accordance with one embodiment of the present invention.
  • FIG. 1 illustrates a star prism configuration for a microdisplay based light train in video projection application in accordance with one embodiment of the present invention.
  • a star prism configuration 100 for the microdisplay based light train in one embodiment includes four pairs of triangular unit each pair laminated to form polarized beamsplitting cubes 101, 102, 103, and 104.
  • the star prism configuration 100 further includes four stacks provided between the polarized beamsplitting cubes 101, 102, 103 and 104.
  • the stacks in one aspect of the present invention include a green dichroic layer 105 laminated to a reflective polarizer layer 106, a magenta dichroic layer 107 laminated onto a blue/yellow waveplate 108, a red/blue waveplate 110 laminated onto a spacer glass layer 109, and finally, a half waveplate 111 laminated onto another spacer glass layer 112.
  • each of the stacks comprising the green dichroic layer 105 laminated onto the reflective polarizer layer 106, the stack including the magenta dichroic layer 107 laminated onto the blue/yellow waveplate 108, the stack including the red/blue waveplate 110 laminated onto the spacer glass layer 109, and the stack including the half waveplate 111 laminated onto the spacer glass layer 112 may be laminated onto a corresponding polarized beamsplitting cubes 101, 102, 103 and 104 to respectively form four different types of stack/polarized beamsplitting cube subassemblies. Indeed, with the four different types of stack/polarized beamsplitting cube subassemblies laminated together, the image path subassembly for the light train may be formed.
  • the surface 101 A of the polarized beamsplitting cube 101 may be configured as the input surface of the star prism configuration 100, while the surface 103 A of the polarized beamsplitting cube 103 may be configured as the output surface of the star prism configuration 100.
  • an air gap 113 may be provided between the polarized beamsplitting cube 104 and the stack including the green dichroic layer 105 laminated onto the reflective polarizer layer 106 such that the air gap 113 is maintained between the reflective polarizer layer 113 and the adjacent surface of the polarized beamsplitting cube 104.
  • the input surface 101 A and the output surface 103A of the star prism configuration 100 may be provided with an anti-reflection coating.
  • the anti- reflection coating in one aspect may also be provided on the top right and lower left surfaces of the prism configuration.
  • Figure 2 illustrates the components of the star prism configuration of Figure 1 in the sequence of assembly in accordance with one embodiment of the present invention.
  • the prism assembly sequence includes initially assembling the stacks 21 by laminating the green dichroic layer 105 onto the reflective polarizer layer 106, laminating the magenta dichroic layer 107 onto the blue/yellow waveplate 108, laminating the red/blue waveplate 110 onto the spacer glass layer 109, and finally, laminating the half waveplate 111 onto another spacer glass layer 112.
  • two triangular units 201, 202 are laminated together to form the polarized beamsplitting cubes 22.
  • the respective stacks are then laminated onto the polarized beamsplitting cubes thus forming the four different types of stack polarized beamsplitting cube subassemblies 203, 204, 205, and 206.
  • the stack/polarized beamsplitting cube subassembly 203 includes the stack comprising the green dichroic layer 105 and the reflective polarizer layer 106, laminated onto the polarized beamsplitting cube 101.
  • the stack/polarized beamsplitting cube subassembly 203 may be considered as the input subassembly for the star prism configuration 100.
  • the stack/polarized beamsplitting cube subassembly 204 includes the stack comprising the magenta dichroic layer 107 and the blue/yellow waveplate 108, laminated onto the polarized beamsplitting cube 102
  • the stack/polarized beamsplitting cube subassembly 205 includes the stack comprising the half waveplate 111 and the spacer glass layer 112, laminated onto the polarized beamsplitting cube 104.
  • the stack/polarized beamsplitting cube subassembly 206 includes the stack comprising the spacer glass layer 109 and the red/blue waveplate 110, laminated onto the polarized beamsplitting cube 103.
  • the three stack/polarized beamsplitting cube subassemblies 204, 205, and 206 are then assembled in the manner as shown in Figure 2 thus forming the optical image path subassembly 24, and thereafter, the input stack/polarized beamsplitting cube subassembly 203 is laminated to the image path subassembly 24 resulting in the star prism configuration 25 for the microdisplay based light train.
  • the star prism configuration for use in the microdisplay based light train may be fabricated.
  • the components may be assembled in a different order so long as the functional integrity of the star prism configuration is maintained.
  • Figure 3 illustrates a flowchart for assembling the star prism configuration of Figure 1 in accordance with one embodiment of the present invention.
  • the stacks comprising the green dichroic layer 105 laminated onto the reflective polarizer layer 106, the magenta dichroic layer 107 laminated onto the blue/yellow waveplate 108, the red/blue waveplate 110 laminated onto the spacer glass layer 109, and the half waveplate 111 laminated onto the spacer glass layer 112 are assembled.
  • the pairs of triangular units are laminated to each other resulting in polarized beamsplitting cubes 101, 102, 103, and 104 ( Figures 1 and 2).
  • the assembled stacks are laminated onto a corresponding one of the polarized beamsplitting cubes 101, 102, 103, and 104, resulting in stack/polarized beamsplitting cube subassemblies 203, 204, 205, and 206 ( Figure 2).
  • the stack/polarized beamsplitting cube subassemblies 204, 205 and 206 are laminated resulting in the image path subassembly
  • the stack polarized beamsplitting cube subassembly 203 which is the input subassembly to the star prism configuration is laminated to the image path subassembly thereby forming the star prism configuration.
  • Figure 4 illustrates the star prism configuration of Figure 1 including the input and output optical path in accordance with one embodiment of the present invention. It should be first noted that the star prism configuration shown in Figure 4 includes components that are similar to the star prism configuration 100 of Figure 1, and thus, a discussion of the like parts labeled as such will be omitted herein.
  • a green microdisplay 401, a red microdisplay 402, and a blue microdisplay 403 substantially positioned as shown in Figure 4 in the optical path of the white input light 404 including the corresponding green, red and blue channels 406, 407, 408, respectively.
  • the white input light 404 is provided on the input surface 101 A of the polarized beamsplitting cube 101, and configured to exit as the white output light 405 from the star prism configuration 100 at the output surface 103A of the polarized beamsplitting cube 103.
  • the optical path lengths of the green, red and blue channels 406, 407, 408, respectively are equal such that optical path length matching of the image path is achieved.
  • an application of glue may be used to achieve variation in joint thickness for the optical path length matching.
  • the star prism assembly configuration of the present invention may include matched optical path lengths, for example, the green, red, and blue channels 406, 407, 408, respectively, such that these optical paths are configured to be substantially identical to each other.
  • the subassembly dimensions may also be used to achieve the path length matching, as well as the glue joint thickness variation as discussed above.
  • a method and system for high volume manufacturing of the prism assembly for use in microdisplay based light train for video projection applications with the necessary dimensional accuracy and without visual defects such as air bubbles in the prism assembly such that the introduction of defects during the assembly procedure is minimized and the mechanical tolerances of the prism assembly such as the outer dimensions of the prism assembly as well as the optical path lengths internal to the prism assembly are taken into consideration during the assembly process.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

L'invention concerne un procédé et un système permettant d'obtenir dans un volume élevé un ensemble prisme destiné à un train de lumière basé sur un micro-affichage pour des applications de projection vidéo, avec une précision dimensionnelle sans défaut visuel tel que des bulles d'air, et permettant de réduire au maximum l'introduction de défauts durant le processus d'assemblage.
PCT/US2001/022226 2000-07-12 2001-07-12 PROCEDE ET SYSTEME PERMETTANT D'OBTENIR UN ENSEMBLE DE CONSTITUANT DE PRISME WO2002004994A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU80553/01A AU8055301A (en) 2000-07-12 2001-07-12 Method and system for providing prism component assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US21775800P 2000-07-12 2000-07-12
US60/217,75820000712 2000-07-12

Publications (1)

Publication Number Publication Date
WO2002004994A2 true WO2002004994A2 (fr) 2002-01-17

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Application Number Title Priority Date Filing Date
PCT/US2001/022226 WO2002004994A2 (fr) 2000-07-12 2001-07-12 PROCEDE ET SYSTEME PERMETTANT D'OBTENIR UN ENSEMBLE DE CONSTITUANT DE PRISME

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Country Link
AU (1) AU8055301A (fr)
WO (1) WO2002004994A2 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002104040A1 (fr) * 2001-06-19 2002-12-27 Intel Corporation Moteur de projection
EP1211547A3 (fr) * 2000-12-02 2004-06-02 Lg Electronics Inc. Système optique pour projecteur à cristaux liquides
US6909556B2 (en) * 2002-01-14 2005-06-21 Lightmaster Systems, Inc. Design of prism assemblies and kernel configurations for use in projection systems
US6999237B2 (en) 2001-09-12 2006-02-14 Lightmaster Systems, Inc. Method and apparatus for configuration and assembly of a video projection light management system
US7006297B2 (en) 2002-01-14 2006-02-28 Lightmaster Systems, Inc. Pathlength matched beam splitter and method and apparatus for assembly
WO2006020359A3 (fr) * 2004-08-09 2006-07-27 3M Innovative Properties Co Systeme d'affichage de projection utilisant plusieurs sources lumineuses et un element de polarisation destine a etre utilise avec un tel systeme
US7280281B2 (en) * 2002-03-05 2007-10-09 Berg & Berg Enterprises, Inc. Method and apparatus for increasing microdisplay black state in light management systems and flexibility to utilize polarized or unpolarized input light
CN102749720A (zh) * 2012-07-24 2012-10-24 哈尔滨工业大学 一种基于棱镜和带通滤光片的消偏振分光系统

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1211547A3 (fr) * 2000-12-02 2004-06-02 Lg Electronics Inc. Système optique pour projecteur à cristaux liquides
WO2002104040A1 (fr) * 2001-06-19 2002-12-27 Intel Corporation Moteur de projection
US6672722B2 (en) 2001-06-19 2004-01-06 Intel Corporation Projection engine
US6999237B2 (en) 2001-09-12 2006-02-14 Lightmaster Systems, Inc. Method and apparatus for configuration and assembly of a video projection light management system
US6909556B2 (en) * 2002-01-14 2005-06-21 Lightmaster Systems, Inc. Design of prism assemblies and kernel configurations for use in projection systems
US7006297B2 (en) 2002-01-14 2006-02-28 Lightmaster Systems, Inc. Pathlength matched beam splitter and method and apparatus for assembly
US7280281B2 (en) * 2002-03-05 2007-10-09 Berg & Berg Enterprises, Inc. Method and apparatus for increasing microdisplay black state in light management systems and flexibility to utilize polarized or unpolarized input light
WO2006020359A3 (fr) * 2004-08-09 2006-07-27 3M Innovative Properties Co Systeme d'affichage de projection utilisant plusieurs sources lumineuses et un element de polarisation destine a etre utilise avec un tel systeme
US7364302B2 (en) 2004-08-09 2008-04-29 3M Innovative Properties Company Projection display system using multiple light sources and polarizing element for using with same
CN102749720A (zh) * 2012-07-24 2012-10-24 哈尔滨工业大学 一种基于棱镜和带通滤光片的消偏振分光系统

Also Published As

Publication number Publication date
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