WO2001037576A1 - Systeme d'imagerie sequentielle - Google Patents

Systeme d'imagerie sequentielle Download PDF

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Publication number
WO2001037576A1
WO2001037576A1 PCT/IL2000/000728 IL0000728W WO0137576A1 WO 2001037576 A1 WO2001037576 A1 WO 2001037576A1 IL 0000728 W IL0000728 W IL 0000728W WO 0137576 A1 WO0137576 A1 WO 0137576A1
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WO
WIPO (PCT)
Prior art keywords
color
color filter
image
spatial light
filter elements
Prior art date
Application number
PCT/IL2000/000728
Other languages
English (en)
Inventor
Boaz Arnon
Original Assignee
Unic View 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 Unic View Ltd. filed Critical Unic View Ltd.
Priority to AU11743/01A priority Critical patent/AU1174301A/en
Publication of WO2001037576A1 publication Critical patent/WO2001037576A1/fr

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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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
    • G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
    • 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
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • H04N9/3114—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing one colour at a time
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements

Definitions

  • the present invention relates generally to imaging systems, and more particularly to a method and apparatus for reduction or elimination of color separation in sequential color imaging.
  • Color projection systems are used in many applications, including conventional television (whether in NTSC, PAL, SECAM, or other formats), wide scene conventional television, high definition television, industrial projectors, home use projectors, and cinema projectors, among other applications.
  • Color projection systems strive to project color images on a screen with a high image quality, while at the same time maintaining low cost and low complexity.
  • One type of basic system employs a single LCD that integrally includes color filters as subpixels (generally red, green, blue - RGB). Advantages are very low cost and complexity.
  • a disadvantage is that since the LCD employs three subpixels (RGB) in order to achieve the color output of one pixel, it is difficult or costly to achieve high resolution. Another disadvantage is that 2/3 of the light impinging on the LCD is wasted. Another system, called a non-sequential color system, divides the color input into three basic color inputs (such as RGB) and transmits them to three individual monochromatic LCDs at high resolution. A projector lens projects the three monochromatic images from the LCDs onto a screen. An advantage of this system is that basically all of the light is utilized.
  • a disadvantage is that the system is complex, since three LCDs are required instead of one. Moreover, the three images must be aligned with a high degree of accuracy, which increases the cost of the projection system.
  • Sequential color systems transmit light which has been filtered in time into three basic color inputs (such as RGB) onto a single LCD at speeds much greater than the above described systems.
  • the result is a sequence of three differently colored, monochromatic images which are rapidly projected one after the other.
  • the human eye superimposes the three monochromatic images and perceives a full color image nearly like the original.
  • typical sequential color systems generate images by sequentially laying down red, green, and blue light in a single image frame, which typically lasts 1/60 of a second.
  • non-sequential color systems the red, green, and blue light are laid down simultaneously.
  • the nonsequential color systems therefore, employ about three times the hardware and complexity of sequential color systems.
  • Liquid crystal displays are just one example of a spatial light modulator (SLM) used in color projection systems.
  • SLM imaging system employs arrays of individual elements, such as digital mirror devices (DMDs), to reflect light onto or away from a projection screen.
  • DMDs digital mirror devices
  • three DMD arrays are used in parallel, one each for red, green, and blue light.
  • a sequential color system SLM device requires only one such array, with the red, green, and blue light sequentially reflected by the single DMD array. The need for three such arrays in the non- sequential color system triples the requirements for the DMD arrays and attendant hardware over the sequential color system.
  • sequential color systems have certain limitations.
  • One such limitation is that of color separation. Color separation occurs in sequential color systems when an imaged object moves across a projection screen with respect to the human eye. This means that color separation can occur when: a. the object moves across a screen and the viewer is stationary b. the viewer moves while the object is stationary
  • Color separation can be simply explained by the following example.
  • a color image of an airplane moves across a projection screen.
  • the airplane will be generated by first laying down the red, then the green, and then the blue. Therefore, as the airplane moves, the front extremity of its leading edge (nose) will appear red, the neighboring region (in the direction of the tail) will be a combination of red and green, and then finally the proper combination of red, green and blue will appear.
  • the rear extremity will appear blue
  • the neighboring region in the direction of the nose
  • the proper combination of red, green and blue will appear.
  • a processor which controls the light source, the color wheel, and the DMD array such that at least two color subframes of a first color, at least one color subframe of a second color, and at least one color subframe of a third color are generated during one image frame.
  • the system projects RGBG. This is particularly effective because of the fact that red, green, and blue light carry different perceptual weightings.
  • red, green, and blue light carry different perceptual weightings.
  • red, green, and blue light carry different perceptual weightings.
  • red, green, and blue light carry different perceptual weightings.
  • better color mixing is achieved by splitting the green light into two color subframes.
  • a color subframe of a first color, a color subframe of a second color, and a color subframe of a third color are generated in one image frame (e.g., RGB).
  • the order that the color subframes are generated is reversed (e.g., BGR).
  • This alternating sequence for each image frame results in the leading edge of the moving object flickering from red to blue and blue to red at a rate of half the image frame frequency, for example, a flicker of 30 Hz for an image frame frequency of 60 Hz.
  • the trailing edge of the moving object will have the same flicker.
  • This flicker may be perceived as a flicker or as a combination of red and blue, for example, magenta.
  • the result is a perception that the leading edge and trailing edge of the moving object are closer to the true color than in conventional systems.
  • the leading and trailing edges will not "switch" colors, as occurs with other prior art systems.
  • the present invention seeks to provide improved methods and apparatus for reduction or elimination of color separation in sequential color imaging.
  • each color filter element is preferably divided into two divisions of different colors, or alternatively, one of the divisions passing white light.
  • Each polarized beam passes through the color filter element to a spatial light modulator, preferably a reflecting SLM.
  • the polarized beam impinges on a pixel of the SLM which generates an image, the image being a subframe of a complete image frame.
  • the images are reflected back from the LCDs and combined for projection onto a screen.
  • the images are sequentially projected one after another to form the complete image frame.
  • One image (or more than one image) from one of the LCDs contains a first color and is projected substantially simultaneously with one image (or more than one image) from the other LCD containing a second color different from the first color.
  • an important advantage of the present invention is that two images containing two colors are constantly projected on a screen, or alternatively two images of white light and one color. This is in contrast to the prior art wherein only one image is projected at a time.
  • several subframes such as RGBG, are generated during one image frame.
  • only one image (subframe) is projected at a time.
  • the constant projection of two images simultaneously improves the reduction of color separation, because the trailing and leading edges of an image will not be made up of a single color but rather two colors. It is readily appreciated that one color separating from the rest of the image stands out more to the eye than a combination of two colors.
  • a sequential imaging system including a light source, a polarizing beam splitter operative to split the light impinging thereon from the light source into two polarized beams, two color filter elements through which the polarized beams pass, one of the color filter elements being divided into two divisions, each division including a different color filter, and the other color filter element comprising at least one color filter, and for each polarized beam, a spatial light modulator adapted to receive the polarized beam which passes through one of the color filter elements and operable to generate an image using the beam, each image being a subframe of an image frame, each of the images being reflected from the spatial light modulator back to the polarizing beam splitter which is operable to combine the images, and a controller operable to control the light source, the color filter elements, and the spatial light modulators such that the images are sequentially projected one after another to form the image frame, wherein at least one image from one of the spatial light modulators containing a first color
  • the polarizing beam splitter is operative to split the light impinging thereon from the light source into two differently polarized beams.
  • the first and second colors are part of a three primary additive color system.
  • one of the divisions of the color filter elements passes white light therethrough, and one of the first and second colors is the white light.
  • the controller is operative to cause a phase shift between movement of the color filter elements, such that one of the polarized beams passes through both divisions of one of the color filter elements, and the image associated with that polarized beam contains two colors, and that image containing two colors is projected substantially simultaneously with at least one image from the other spatial light modulator containing at least one color.
  • one of the two colors is different from the a ⁇ least one color.
  • both of the two colors are different from the at least one color.
  • the color filter element is generally circular.
  • the color filter element may include a polygonal color filter element.
  • an actuator moves the color filter elements.
  • the actuator may move the color filter element in a direction generally parallel to a plane of its corresponding spatial light modulator, for example.
  • the actuator may move the color filter element generally linearly, arcuately or in a swinging motion.
  • the divisions of the color filter elements have polygonal shapes.
  • the divisions of the color filter elements may have an irregular shape.
  • the divisions of the color filter elements are separated by a non-transmissive stripe.
  • the spatial light modulators include reflective LCDs.
  • a method for sequential imaging including splitting light into two polarized beams, passing the polarized beams through two color filter elements, each color filter element being divided into two divisions, each division including a different color filter, for each polarized beam, using a spatial light modulator to receive the polarized beam and to generate an image using the beam, each image being a subframe of an image frame, reflecting each of the images from the spatial light modulator and combining the images for projection onto a screen, and sequentially projecting the images one after another to form the image frame, wherein at least one image from one of the spatial light modulators containing a first color is projected substantially simultaneously with at least one image from the other spatial light modulator containing a second color different from the first color.
  • the light is split into two differently polarized beams.
  • the method includes transmitting an initial image to the spatial light modulator for an initial color, passing the polarized beam through one of the divisions of one of the color filter elements, the beam being projected on the spatial light modulator, moving the color filter element such that the polarized beam passes through a line of demarcation between the divisions of that color filter element, detecting that the line of demarcation between the divisions is projected onto the spatial light modulator, and sending a subsequent image to the spatial light modulator for a subsequent color, without removing the initial color, such that the subsequent color overrides the initial image.
  • Fig. 1 is a simplified pictorial illustration of a projection system constructed and operative in accordance with a preferred embodiment of the present invention
  • Fig. 2 is a simplified pictorial illustration of a projection system constructed and operative in accordance with another preferred embodiment of the present invention
  • Fig. 3 is a simplified pictorial illustration of a projection system constructed and operative in accordance with yet another preferred embodiment of the present invention
  • Figs. 4A-4F are simplified pictorial illustrations of color filter elements useful in the projection systems of Figs. 1-3, constructed and operative in accordance with a preferred embodiment of the present invention.
  • Fig. 1 illustrates a projection system 20 constructed and operative in accordance with a preferred embodiment of the present invention.
  • Projector system 20 preferably includes a light source 1, such as an arc lamp based illuminator, which directs a beam of light onto a polarizing beam splitter/combiner
  • Polarizing beam splitter/combiner 2 (also herein referred to as polarizing beam splitter 2) is preferably constructed as described in applicant assignee's US Patent 5,946, 139 and PCT published patent application WO 99/52269, the disclosures of which are incorporated herein by reference.
  • Polarizing beam splitter 2 preferably comprises first and second prisms 14 and 16 separated by a birefringent material 17.
  • polarizing beam splitter 2 may comprise Glen-Thompson or Wollaston prisms which are commercially available from Melles Griot or Spindler & Hoyer.
  • polarizing beam splitter 2 may be a conventional broad-band polarizing beam splitter comprising plural prisms which are separated by multilayer optical coatings.
  • Polarizing beam splitter 2 is operative to split the light impinging thereon from light source 1 into two polarized beams, 8 and 9.
  • Beams 8 and 9 typically, but not necessarily, have different polarizations, such as the p and s components of polarized light, respectively.
  • Beam 8 is reflected in the area of the interface of prisms 14 and 16 towards a first color filter element, herein referred to as color wheel 3.
  • Beam 9 passes unreflected to a second color filter element, herein referred to as color wheel 4.
  • beams 8 and 9 each impinge on a selectably actuable polarization-rotating light valve 5 operating in a reflective mode.
  • An example of a suitable light valve is a conventional reflective LCD without a polarizer.
  • Light valve 5 is herein referred to as LCD 5.
  • Beams 8 and 9 are reflected from LCDs 5 as reflected beams 10 and 1 1. If beams 8 and 9 each impinge upon a pixel in the corresponding LCD 5 which changes the polarity of the beam, then beams 10 and 11 have a different polarity than that of beams 8 and 9, such as s and p, respectively.
  • Reflected beam 10 passes through color wheel 3, and since it has p polarity, it passes unreflected through polarizing beam splitter 2 and is projected onto a screen 12 by means of a lens 6.
  • Reflected beam 1 1 passes through color wheel 4, and since it has s polarity, it is reflected in the area of the interface of prisms 14 and 16, and is also projected onto screen 12 by means of lens 6.
  • polarizing beam splitter 2 increases utilization of the light from light source 1 and increases the brightness of the image projected onto screen 12.
  • color wheels 3 and 4 are not part of the illumination system of light source 1, but rather are placed between polarizing beam splitter 2 and LCDs 5.
  • Screen 12 may be any projection surface, such as a projector screen, a television screen, a printer drum, a piece of photographic film, or any photosensitive media, for example.
  • color wheels 3 and 4 are each divided into two divisions 3 A, 3B and 4 A, 4B, respectively, each division including a different color filter.
  • the two colors may be part of a three primary additive color system, such as red, green and blue (RGB). In such a case, the two colors may be R and G or G and B or R and B.
  • one of the color filter elements may be divided into two divisions, and the other color filter element can include just one, or more than one, color filter.
  • one color wheel 3' may have one division 3C with a green color filter, and another division 3D may have no color filter, meaning that division 3D passes white light.
  • Another color wheel 4' may have one division 4C with a red color filter, and another division 4D with a blue filter.
  • Sampsell the disclosure of which is incorporated herein by reference.
  • Sampsell requires/cwr regions in the color wheel, three dedicated to light of one of three primary additive colors (RGB), and the other region being dedicated to white light.
  • RGB primary additive colors
  • An important advantage of the present invention is that two images containing two colors are constantly projected on screen 12 (as in Fig. 1), or alternatively two images of white light and one color (as in Fig. 2). This is in contrast to the prior art wherein only one image is projected at a time.
  • several subframes, such as RGBG are generated during one image frame.
  • Projection system 20 preferably includes control electronics, herein referred to as a controller 21, that feeds the images (subframes) to be projected to LCDs 5.
  • Controller 21 is in electrical communication with LCDs 5 and color wheels 3 and 4 (or 3' and 4').
  • Controller 21 preferably feeds separate images to each LCD 5 in synchronization with the colored light impinging on that LCD from its corresponding color wheel 3 or 4 (or 3' or 4').
  • the images can be projected by laying down one color at a time separately from each other, e g , by changing the electronic image signal fed to the LCD per each subframe Alternatively, two colors can be laid down simultaneously on the LCDs, as is now explained
  • Controller 21 typically synchronizes the rotation of the color wheels with each other
  • controller 21 may cause a phase shift of any desired magnitude between the rotations of the two color wheels 3 and 4 (as in Fig 1) or 3' and 4' (as in Fig 2)
  • This phase shift means that at some times during the color wheel rotation, while one color of one color wheel is laid down on screen 12, two colors of the other color wheel will also be laid down on screen 12, thereby further reducing the phenomenon of color separation
  • the color wheels may each include more than two colors and be rotated with a phase shift therebetween
  • Fig 3 illustrates a variation of the structure shown in Fig. 1.
  • the invention instead of generally circular color wheels, the invention preferably employs a polygonal color filter element 22, such as a generally rectangular color filter element that includes two or more color filters 12 and 13
  • the colors of filters 12 and 13 may be as described hereinabove with reference to the embodiments of Figs 1 and 2
  • Color filter element 22 is preferably moved by an actuator
  • Actuator 24 which may be a step motor operating in a closed loop control system, can move color filter element 22 closer to or further from, generally perpendicularly to, LCDs 5, or can move color filter element 22 generally parallel to a plane of LCDs 5
  • Actuator 24 can move color filter element 22 linearly, arcuately or in a swinging motion of a pendulum, for example
  • actuator 24 may also be used to rotate the color wheels illustrated in Figs 1 and 2
  • the color filter elements may have different kinds of configurations
  • a color filter element 26 includes two generally rectangular regions 28 and 30, each with a different color filter, such as R and
  • a color filter element 32 includes three generally rectangular regions 34,
  • a color filter element 40 includes three generally rectangular regions 42, 44 and 46, wherein regions 42 and 46 include the same color filter, such as R, and region 44 is colored differently, such as G.
  • a color filter element 47 may include trapezoidal regions 48 and 50, as shown in Fig. 4D. Indeed the color filter element may be of any arbitrary shape or size, such as an irregularly shaped color filter element 52 shown in Fig. 4E.
  • a non-transmissive stripe 60 which may be useful in synchronizing movement of color filter element 58, as described hereinbelow.
  • controller 21 can lay down one color at a time separately from each other. Alternatively, two colors can be laid down simultaneously on the LCDs. In both of these cases, the color wheels or color filter elements must be typically moved rapidly during one complete image frame, in order to avoid light losses when switching from one color to another. However, in accordance with another preferred embodiment of the present invention, the color wheels or color filter elements can be moved during one complete image frame, as is now explained.
  • a first color is projected onto the LCD 5 from the color wheel 3 or 4 (or 3' or 4') or color filter element (22, 26, 32, 40, 47, 52 or 58).
  • the color wheel or color filter element is moved from one color to another, the line of demarcation between the different color regions of the color wheels or color filter elements is also projected onto the LCD.
  • two colors are projected onto the LCD: a), the previous or "old” color, and b), the next or "new” color, plus the line of demarcation between these colors.
  • controller 21 feeds the image to the LCD solely in the "new” color, without removing or erasing the "old” color. In this manner, the image in the "new” color overrides the image in the "old” color.
  • non-transmissive stripe 60 as the line of demarcation between the colors, it is easier for the electronics of controller 21 to recognize the passing of one color to another.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Projection Apparatus (AREA)

Abstract

L'invention concerne un système d'imagerie séquentielle comprenant une source lumineuse, un séparateur de faisceau polarisant destiné à diviser une lumière incidente provenant de la source lumineuse en deux faisceaux polarisés, deux éléments à filtre coloré à travers lesquels passent lesdits faisceaux polarisés, l'un de ces éléments à filtre coloré étant divisé en deux parties, chaque partie comprenant un filtre coloré différent, l'autre élément de filtre coloré comprenant au moins un filtre coloré, pour chaque faisceau polarisé, un modulateur spatial de lumière conçu pour recevoir ledit faisceau polarisé traversant l'un desdits éléments à filtre coloré et destiné à produire une image au moyen dudit faisceau, chaque image constituant une sous-trame d'une trame d'image, chacune desdites images étant rétro-réfléchie à partir de ce modulateur spatial de lumière vers le séparateur de faisceau polarisant, celui-ci permettant de combiner lesdites images, ainsi qu'une unité de commande destinée à commander la source lumineuse, les éléments à filtre coloré et les modulateurs spatiaux de lumière, de façon que ces images soient projetées l'une après l'autre de manière séquentielle et qu'elles forment la trame d'image. Au moins une image provenant de l'un desdits modulateurs spatiaux de lumière contenant une première couleur est projetée de manière sensiblement simultanée avec au moins une image en provenance de l'autre modulateur spatial de lumière contenant une seconde couleur différente de la première couleur. L'invention concerne également un procédé d'imagerie séquentielle.
PCT/IL2000/000728 1999-11-19 2000-11-08 Systeme d'imagerie sequentielle WO2001037576A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU11743/01A AU1174301A (en) 1999-11-19 2000-11-08 Sequential imaging system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL13305199A IL133051A0 (en) 1999-11-19 1999-11-19 Sequential imaging systems
IL133051 1999-11-19

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WO2001037576A1 true WO2001037576A1 (fr) 2001-05-25

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1423753A1 (fr) * 2001-07-12 2004-06-02 Genoa Color Technologies Ltd. Afficheur sequentiel de projections en couleur a panneaux multiples d'imagerie
WO2005060267A1 (fr) * 2003-12-11 2005-06-30 Koninklijke Philips Electronics, N.V. Systeme d'affichage integrant un transducteur d'ondes electromecanique
EP1670261A1 (fr) 2004-12-13 2006-06-14 Sagem SA Moteur optique pour appareil de projection d'images muni d'un filtre à déplacement linéaire
EP1807822A1 (fr) * 2004-11-02 2007-07-18 Ricoh Company, Ltd. Dispositif d'affichage d'image et dispositif de projection d'image
EP1874062A1 (fr) * 2006-06-30 2008-01-02 Thomson Licensing Système optique pour projecteur et projecteur correspondant

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01149088A (ja) * 1987-12-07 1989-06-12 Canon Inc 投影表示方法および表示装置
US5357288A (en) * 1991-12-10 1994-10-18 Pioneer Electronic Corporation Liquid crystal projector and method of projecting image
US5784038A (en) * 1995-10-24 1998-07-21 Wah-Iii Technology, Inc. Color projection system employing dual monochrome liquid crystal displays with misalignment correction
US5921650A (en) * 1998-02-27 1999-07-13 International Business Machines Corporation High efficiency field-sequential color projector using two SLMs
WO1999052269A2 (fr) * 1998-04-06 1999-10-14 Unic View Ltd. Projecteur compact
JP2000147656A (ja) * 1998-11-13 2000-05-26 Ind Technol Res Inst ２板式液晶プロジェクタ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01149088A (ja) * 1987-12-07 1989-06-12 Canon Inc 投影表示方法および表示装置
US5357288A (en) * 1991-12-10 1994-10-18 Pioneer Electronic Corporation Liquid crystal projector and method of projecting image
US5784038A (en) * 1995-10-24 1998-07-21 Wah-Iii Technology, Inc. Color projection system employing dual monochrome liquid crystal displays with misalignment correction
US5921650A (en) * 1998-02-27 1999-07-13 International Business Machines Corporation High efficiency field-sequential color projector using two SLMs
WO1999052269A2 (fr) * 1998-04-06 1999-10-14 Unic View Ltd. Projecteur compact
JP2000147656A (ja) * 1998-11-13 2000-05-26 Ind Technol Res Inst ２板式液晶プロジェクタ

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 07 31 March 1998 (1998-03-31) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 08 6 October 2000 (2000-10-06) *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1423753A1 (fr) * 2001-07-12 2004-06-02 Genoa Color Technologies Ltd. Afficheur sequentiel de projections en couleur a panneaux multiples d'imagerie
EP1423753A4 (fr) * 2001-07-12 2005-08-03 Genoa Technologies Ltd Afficheur sequentiel de projections en couleur a panneaux multiples d'imagerie
WO2005060267A1 (fr) * 2003-12-11 2005-06-30 Koninklijke Philips Electronics, N.V. Systeme d'affichage integrant un transducteur d'ondes electromecanique
EP1807822A1 (fr) * 2004-11-02 2007-07-18 Ricoh Company, Ltd. Dispositif d'affichage d'image et dispositif de projection d'image
EP1807822A4 (fr) * 2004-11-02 2009-08-12 Ricoh Kk Dispositif d'affichage d'image et dispositif de projection d'image
EP1670261A1 (fr) 2004-12-13 2006-06-14 Sagem SA Moteur optique pour appareil de projection d'images muni d'un filtre à déplacement linéaire
FR2879310A1 (fr) * 2004-12-13 2006-06-16 Sagem Moteur optique pour appareil de projection d'images muni d'un filtre a deplacement lineaire
EP1874062A1 (fr) * 2006-06-30 2008-01-02 Thomson Licensing Système optique pour projecteur et projecteur correspondant
FR2903199A1 (fr) * 2006-06-30 2008-01-04 Thomson Licensing Sas Systeme optique pour projecteur et projecteur correspondant
JP2008015517A (ja) * 2006-06-30 2008-01-24 Thomson Licensing 投影器のための光学システム及び対応する投影器
US7862182B2 (en) 2006-06-30 2011-01-04 Thomson Licensing Optical system for a projector, and corresponding projector

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IL133051A0 (en) 2001-03-19
AU1174301A (en) 2001-05-30

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