WO2005076070A1 - Projecteur couleur et procede associe - Google Patents

Projecteur couleur et procede associe Download PDF

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Publication number
WO2005076070A1
WO2005076070A1 PCT/US2004/000611 US2004000611W WO2005076070A1 WO 2005076070 A1 WO2005076070 A1 WO 2005076070A1 US 2004000611 W US2004000611 W US 2004000611W WO 2005076070 A1 WO2005076070 A1 WO 2005076070A1
Authority
WO
WIPO (PCT)
Prior art keywords
bars
schlieren
optical system
light
array
Prior art date
Application number
PCT/US2004/000611
Other languages
English (en)
Inventor
William E. Glenn
Original Assignee
Florida Atlantic University
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 Florida Atlantic University filed Critical Florida Atlantic University
Priority to PCT/US2004/000611 priority Critical patent/WO2005076070A1/fr
Publication of WO2005076070A1 publication Critical patent/WO2005076070A1/fr

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Classifications

    • 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
    • G03B21/14—Details
    • G03B21/28—Reflectors in projection beam
    • 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
    • G03B21/06—Projectors or projection-type viewers; Accessories therefor affording only episcopic projection

Definitions

  • This invention relates to projection of images and, more particularly, to an improved apparatus and method for projecting and displaying images, still or moving , using a solid state light modulator.
  • a form of the invention relates to a single modulator color projector that employs color selection by diffraction.
  • a light valve projector projects a bright light source through an electro-optical system that receives electronic image information and produces a projected optical image.
  • Light-valve projectors are rapidly converting to matrix driven arrays; examples being active matrix LCD projectors such as the projector disclosed in U .S. Patents 5,231 ,432 and 6,086,208, and the so-called "DLP" display of Texas Instruments Company which uses technology originating from the type of solid state light modulator disclosed in U .S. Patent 3,882,271 .
  • One prior approach describes a solid state light modulator which employs a reflective patterned alignment modulator in a projector having a schlieren optical system. There is a drawback to this system, however.
  • the schlieren lens In order to get a high contrast ratio, the schlieren lens needs to have an extremely good non-reflective coating. For transmissive schlieren optics this is not a serious problem, since it takes two reflections from lens surfaces to reduce contrast. With a reflective system, however, only one reflection reduces contrast. It is among the objects of the present invention to overcome disadvantages of prior art approaches, and to devise an improved method and apparatus for projection of images using solid state light modulation. It is among the further objects of the present invention to provide an improved single modulator color projector that employs color selection by diffraction.
  • a focusing reflector such as a parabolic reflector
  • an apparatus for displaying images represented by electronic image information that includes a light source and a reflective light modulator for optically modulating, with the image information, light from the light source to obtain a diffraction pattern that depends on the image information.
  • An optical system is provided for converting the diffraction pattern into an image, and projection optics are provided for projecting the image obtained with the optical system.
  • the optical system includes an array of schlieren bars and a focusing reflector.
  • the schlieren bars and focusing reflector are arranged such that the path of light from the light source comprises reflection from the schlieren bars to the focusing reflector and the reflective light modulator, and then again to the focusing reflector and then through the schlieren bars to the projection optics.
  • color imaging is achieved in an apparatus having an optical system that employs an array of shlieren bars which includes two portions having bars oriented in respectively different directions.
  • complementary dichroic mirror sections (such as green and magenta) are used in conjunction with the indicated array of shlieren bars to achieve improved projection and display of color image information.
  • Figure 1 is a schematic diagram of a solid state modulator image projector in accordance with an embodiment of the invention.
  • Figure 2, 3, and 4 show schematic diagrams of a single modulator color projector employing color projection by diffraction, in accordance with an embodiment of the invention.
  • Figure 2 is a top view
  • Figure 3 is side view
  • Figure 4 is a front view of portions of this embodiment.
  • light formed into parallel optical beams by a diachronic reflector is directed through an input light mask component of a schlieren optical system comprising an array of bars between which there are transparent areas or slits, whereby the light transmitted by each transparent area appears to originate from a different source of light.
  • a schlieren optical system comprising an array of bars between which there are transparent areas or slits, whereby the light transmitted by each transparent area appears to originate from a different source of light.
  • the parallel optical beams from the source are focused onto the slits by a lenticular lens plate registered with the array of bars.
  • the transmitted optical beams are split by a green-magenta dichroic mirror which splits the beams into a magenta beam (red and blue) and a green beam.
  • the magenta beam is passed through a schlieren lens to illuminate a liquid crystal (LC) panel, referred to as a "magenta" panel.
  • the green beam is passed through a second schlieren lens to illuminate a second LC panel, referred to as a "green" panel.
  • the red , blue and green components of the light from the source are selected by diffraction and their intensities modulated in accordance with processed video signals applied to the panels by associated electronic circuitry.
  • the modulated beams are recombined by another green- magenta dichroic mirror, and the combined beam is directed through an output light mask comprising an array of schlieren bars, and projected onto a screen by a projection lens.
  • the LC panels each function as a light modulating medium, the light modulating characteristics of which are controlled in accordance with color intelligence signals by applying the signals to the panels which include, in addition to the matrix electrodes, a structure of interdigital electrodes which form a color-selecting diffraction grating.
  • Figure 1 illustrates, in simplified form, a form of the invention which employs a reflective light modulator represented at 1 10, which receives input electronic image-representative signals on a line 1 1 1 and generates a diffraction-producing reflective surface as previously described .
  • an arc lamp light source 105 an array of reflective schlieren bars 120, a projection lens 130, and a screen 150.
  • the focusing in the schlieren optical system is implemented by a parabolic reflector 160, the focal point of which is shown at 161 , at the plane of the schlieren bars.
  • a parabolic reflector 160 the focal point of which is shown at 161 , at the plane of the schlieren bars.
  • light from the light source is reflected from the schlieren bars to the parabolic reflector and to the reflective light modulator 1 10, and then back the same path to and through the schlieren bars, for projection of the image on screen 150.
  • a further form of the invention shown in Figures 2, 3, and 4, employs an electrode modulation system. This is a modification of an approach previously summarized, which uses color selected by diffraction.
  • the electrodes can be the ones used to produce diffraction patterns in the commercial "Talaria" projector of General Electric Company, and can be practiced with either transmission or reflection. Reflection is preferred using the described optics, since it avoids the loss of contrast produced by the diffraction from the drive lines in a transmissive system.
  • some elements of Figure 1 have like reference numerals; namely arc lamp 105, reflective modulator 1 10, input signal line 1 1 1 , parabolic reflector 160, projection optics 130, and screen 150.
  • lenticular integrator 170 and transmissive schlieren bar array 180 which is seen to include one portion (181 ) having schlieren bars for the green information, and , oriented orthogonally therefrom, another portion (182) for the magenta information .
  • Dichoric mirror 190 includes green-reflecting dichroic portion 191 and magenta-reflecting dichroic portion 192.
  • the output schlieren bar array is labeled 185.
  • a pixel can be subdivided into an array of 3 sub-pixels or an array of 3 by 3 sub-pixels. In the horizontal direction, in a sequence of two pixels sub-pixels are driven in clusters to produce a horizontal pair of gratings.
  • Driving the sub-pixels in pairs produces the red diffraction grating and in triplets produces the green diffraction grating.
  • Green is a diffracted vertically. In a vertical sequence of two pixels either one line on and one off will produce the green grating for the three by one matrix.
  • Driving vertical sub-pixels in pairs will produce the green grating for the 3 by 3 matrix.
  • the 3 by 3 arrangement will produce slightly better vertical resolution than the one by three. This is because the diffraction from the schlieren bars is less.
  • the "Talaria" projector produced images similar to the one by three version. The total amount of silicon needed for a solid state projector that uses one, two, or three modulators to produce color is the same for a given amount of light output.
  • the modulator for a one chip version must be three times the area of each modulator in a three chip version. However, it does not have any registration problems.
  • the one chip version has another subtle advantage.
  • An integrator (as used in the "Talaria" projector) can be used to improve the optical efficiency and uniformity.
  • the optical arrangement in the embodiment of Figures 2-4 illustrates use of an integrator in the present system.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

L'invention concerne un appareil servant à afficher des images représentées par des informations d'image électronique. Cet appareil comprend une source de lumière (105) et un modulateur de lumière réfléchissante (110) qui permet de moduler optiquement, avec les informations d'image, la lumière émise par la source de lumière afin d'obtenir un diagramme de diffraction qui dépend des informations d'image. Un système optique permet de convertir le diagramme de diffraction en une image et une optique de projection permet de projeter l'image obtenue avec le système optique. Le système optique comprend un réseau de schlierens (120) et un réflecteur de focalisation (160).
PCT/US2004/000611 2004-01-09 2004-01-09 Projecteur couleur et procede associe WO2005076070A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2004/000611 WO2005076070A1 (fr) 2004-01-09 2004-01-09 Projecteur couleur et procede associe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2004/000611 WO2005076070A1 (fr) 2004-01-09 2004-01-09 Projecteur couleur et procede associe

Publications (1)

Publication Number Publication Date
WO2005076070A1 true WO2005076070A1 (fr) 2005-08-18

Family

ID=34839165

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/000611 WO2005076070A1 (fr) 2004-01-09 2004-01-09 Projecteur couleur et procede associe

Country Status (1)

Country Link
WO (1) WO2005076070A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013185351A1 (fr) * 2012-06-15 2013-12-19 神画科技（深圳）有限公司 Dispositif de projection et son dispositif de projection de téléphone mobile

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882271A (en) * 1973-11-13 1975-05-06 Columbia Broadcasting Syst Inc Display using array of charge storage devices
US4111538A (en) * 1976-02-25 1978-09-05 Xerox Corporation Projection system of high efficiency
US4615595A (en) * 1984-10-10 1986-10-07 Texas Instruments Incorporated Frame addressed spatial light modulator
US5231432A (en) * 1991-12-03 1993-07-27 Florida Atlantic University Projector utilizing liquid crystal light-valve and color selection by diffraction
US6086208A (en) * 1998-12-07 2000-07-11 Florida Atlantic University Light valve projector apparatus and technique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882271A (en) * 1973-11-13 1975-05-06 Columbia Broadcasting Syst Inc Display using array of charge storage devices
US4111538A (en) * 1976-02-25 1978-09-05 Xerox Corporation Projection system of high efficiency
US4615595A (en) * 1984-10-10 1986-10-07 Texas Instruments Incorporated Frame addressed spatial light modulator
US5231432A (en) * 1991-12-03 1993-07-27 Florida Atlantic University Projector utilizing liquid crystal light-valve and color selection by diffraction
US6086208A (en) * 1998-12-07 2000-07-11 Florida Atlantic University Light valve projector apparatus and technique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013185351A1 (fr) * 2012-06-15 2013-12-19 神画科技（深圳）有限公司 Dispositif de projection et son dispositif de projection de téléphone mobile

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