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WO1998039917A1 - Afficheur a cristaux liquides pour projecteur de diapositives - Google Patents

Afficheur a cristaux liquides pour projecteur de diapositives Download PDF

Info

Publication number
WO1998039917A1
WO1998039917A1 PCT/AU1998/000138 AU9800138W WO9839917A1 WO 1998039917 A1 WO1998039917 A1 WO 1998039917A1 AU 9800138 W AU9800138 W AU 9800138W WO 9839917 A1 WO9839917 A1 WO 9839917A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
crystal display
display screen
slide
projector
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/AU1998/000138
Other languages
English (en)
Inventor
Kevin James Soper
Philip Brendan Banks
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.)
Digislide International Pty Ltd
Original Assignee
Digislide International Pty 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 Digislide International Pty Ltd filed Critical Digislide International Pty Ltd
Priority to AU60830/98A priority Critical patent/AU6083098A/en
Publication of WO1998039917A1 publication Critical patent/WO1998039917A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • G03B21/16—Cooling; Preventing overheating
    • 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
    • G03B21/54—Accessories
    • G03B21/64—Means for mounting individual pictures to be projected, e.g. frame for transparency
    • 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
    • G03B23/00—Devices for changing pictures in viewing apparatus or projectors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
    • H04N5/7441—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being an array of liquid crystal cells

Definitions

  • This invention is directed to a method and an apparatus to display large video or television images and specifically to a method and apparatus that adapts conventional slide projectors that are currently used to display slides.
  • an apparatus for use with a slide projector comprising a liquid crystal display screen, said liquid crystal display screen being of a shape and size to locate in an operative position in a slide projector to enable illumination through said liquid crystal display screen for projection onto another surface.
  • liquid crystal display screen is adapted to be inserted into the slide projector as a conventional slide.
  • the apparatus further comprises a transparent heat shield means attached to at least one side of the liquid crystal display.
  • liquid crystal display screen further includes a heat shield.
  • liquid crystal display screen is divided into a plurality of individual screens to thereby allow one image to display separate images.
  • the signals input into said liquid crystal display screen are provided by a transmitter adapted to transmit the signals, and a receiver adapted to receive the signals and output the signals them to said liquid crystal display screen.
  • the slide projector comprises an adjustable lens to thereby focus the image onto said surface area.
  • the liquid crystal display screen is adapted to be used with a slide projector which projects light through said liquid crystal display screen and onto a surface area.
  • an adaptor comprising a controlled transparency liquid crystal display panel, and a supporting perimeter frame which frame has a shape, width and perimeter dimensions such that the frame will locate in an operative position in a transparent slide illuminating projector and hold the panel for illuminating projection therethrough from such a projector.
  • an adaptor comprising a controlled transparency liquid crystal display panel, and a supporting perimeter frame which frame has a shape, width and perimeter dimensions such that the frame will locate in an operative position in a transparent slide illuminating projector and an illuminating projector having the panel so located therein.
  • FIG 1 is a perspective view of a first embodiment of the invention when used with a slide projector incorporating a liquid crystal display (liquid crystal display) screen adapted to be used with a slide projector;
  • a liquid crystal display liquid crystal display
  • FIG 2 is a perspective view of a second preferred embodiment of the apparatus
  • FIG 3 is a perspective view of the apparatus of Figure 1 used to display an image
  • FIG 4 is a perspective view of a third embodiment of the invention when used with a slide projector
  • FIG 5 is a perspective view of a fourth embodiment of the invention.
  • FIG 6 is a perspective underside view of the fourth embodiment of the invention.
  • FIG 7 is a perspective view of a slide projector incorporating a fifth embodiment of the invention.
  • FIG 8 is a partial cross-sectional view of a slide projector when projecting light through a liquid crystal display screen
  • FIG 9 (a) and (b) are partial cross-sectional views of an improved slide projector incorporating a heat shield for the liquid crystal display screen showing the liquid crystal display being outside of and inside of the slide projector respectively;
  • FIG 10 (a) and (b) are partial cross-sectional views of a liquid crystal display screen incorporating a heat shield outside of and inside the slide projector respectively.
  • FIG. 1 a slide projector 10 that is commonly used to show slides (not shown) by inserting a slide into aperture 12 whereupon an internal light (not shown in Figure 1) projects a light through a slide contained within aperture 12 and through lens 14 to be displayed on some surface such as a screen a wall or even a sheet hanging of furniture.
  • the lens 14 is further generally adjustable in focus so as to project a clear image onto the screen depending on the distance from the slide projector to the screen.
  • Slide projectors are usually constructed either to take individual slides, or are adapted to accommodate a slide holder that may take a number of slides. Slide holders may further be of a linear construction or a carousel. In both cases the slide holder is adapted to change slides automatically without the necessity to manually change the slides.
  • This invention makes use of the fact that a slide projector is adapted to project light through a slide.
  • a small display screen such as a liquid crystal display screen commonly found in hand-held television receivers although either screen may very well be used, whose size is constructed to be similar to that of a slide and which is adapted to be inserted into the slide projector aperture 12, one can then project whatever image is being displayed by the display screen in much the same way as one uses the slide projector to display slides.
  • the screen slide 18 can be used to display either television or video or any other image, with the slide projector simply projecting and thereby greatly enlarging whatever image is being shown by the screen, one obtains an image whose size may be greater than that available by conventional television receivers and whose resolution is dependant only on the total number of pixel's contained within the slide screen and the ultimate size of the image is fully controllable by the user.
  • the apparatus 16 that controls the liquid crystal display screen slide 18, hereinafter termed the digislide is simply placed on top of a standard slide projector, and aligned so that the liquid crystal display screen slide 18 which protrudes from the bottom of the digislide 16 is inserted into the aperture 12 of the slide projector 10. Obviously the depth that the liquid crystal display screen slide projects into the slide projector must be accurate so that the liquid crystal display screen is in the correct position.
  • the digislide 16 unit also may include a fan 20 which is designed to provide an airflow around the liquid crystal display screen slide and thus cooling which would normally exposed to the intense heat from the lamp of the slide projector.
  • the liquid crystal display screen slide may be used to display either moving pictures that may be provided from normal television signals or from a video, that image then simply enlarged and projected from the slide projector.
  • the liquid crystal display screen may equally well be used to show stationary pictures and in this way the digislide may be used to act as simply a series of slides, thereby removing the need to load different slides.
  • the image projected onto the liquid crystal display screen slide may be those from a computer as is commonly used in various lectures and seminars providing both moving and stationary images.
  • the digislide may input an image into the liquid crystal display screen slide via a cable 24 as is shown in Figure 2.
  • a cable 24 as is shown in Figure 2.
  • the digislide apparatus may also include an antenna connection 25 that may be used to feed a signal into the digislide.
  • the digislide may itself contain a video player to provide an image to the liquid crystal display screen slide.
  • Figure 3 therefore shows the digislide 16 in use whereupon the digislide is placed on top of the slide projector 10 and by providing an image to the liquid crystal display screen slide 18 contained within the slide projector, one may project an image 26 onto a screen 28.
  • the liquid crystal display screen slide may be adapted to receive remote signals. This is illustrated in Figure 4 wherein the liquid crystal display screen slide 18 obtains signals from a remote receiver 30 through cable 31.
  • the remote receiver 30 receives transmitted signals 32 from transmitting unit 34, which may be a video tape recorder/player or a television receiver. This embodiment removes the necessity for cabling and allows for the carousel 36 to rotate without any of the cabling being tangled up.
  • liquid crystal display screen slide 18 could be positioned in a particular slide holder within the carousel 36.
  • liquid crystal display screen slide 18 could also envisage include a plurality of liquid crystal display screens fed from the receiver if one wanted to show images in between slides.
  • the need for the carousel would be obviated.
  • the pictures are not able to be displayed through the liquid crystal display screen slide then one would need to use the carousel.
  • FIG. 5 A further embodiment of the digislide is shown in Figure 5 wherein the liquid crystal display screen slide is able to be retracted into the digislide.
  • the digislide could be adapted to fit over the top of the slide projector with the liquid crystal display screen to be inserted into the aperture 12 when required. This could be accomplished by the use of retractable arms 40 that simply retract and lower the liquid crystal display screen slide 18.
  • FIG. 6 This embodiment is further illustrated in Figure 6 wherein the liquid crystal display screen slide 18 shown in its retracted position within the digislide by the dashed lines. This embodiment enables the liquid crystal display screen slide to be safely stored when it is not in use and thereby minimise damage to the liquid crystal display screen slide and further make it easier for transportation and packaging.
  • FIG. 7 A yet further embodiment of the invention is illustrated in Figure 7 wherein there is a liquid crystal display screen slide 18 permanently installed within the slide projector 10 and adapted to be inserted into the correct position to be illuminated by the lamp within the slide projector.
  • a liquid crystal display screen slide 18 permanently installed within the slide projector 10 and adapted to be inserted into the correct position to be illuminated by the lamp within the slide projector.
  • the liquid crystal display screen slide is controlled by appropriate cabling or remote transmission.
  • a further embodiment, although not illustrated may include a single slide projector which incorporates a video player or television receiver.
  • the present invention provides for the ability to produce an image of a desirable size by the adaptation of a common slide projector.
  • the liquid crystal display screen slide 18 is simply placed in the appropriate position as would be a normal slide in a slide projector 10, with a lamp 42 providing light to illuminate and shine through the liquid crystal display screen slide 18, lens 14 and onto a surface area such as a screen.
  • the digislide slide may be used as a television receiver, to play video tapes and even projects an image from a computer system, such as which may occur when children and adults alike play computer games, the size of the image being dependent only on the lens and the distance to the screen.
  • a difficulty that may arise with using an liquid crystal display screen slide within the projector may be that the lamps from the slide projector are known to produce an intense amount of heat.
  • the liquid crystal display screen slide may further include a heat shield that protects the screen slide form that heat.
  • the heat shield may be constructed wither within the slide projector as shown in Figure 9 where the embodiment shows the heat shield 44 stationary within slide projector, and the liquid crystal display screen slide being outside of and inserted within the slide projector 10 in Figures 9 (a) and (b) respectively.
  • the liquid crystal display screen slide itself may contain a heat shield 44 as shown in Figure 10. This requires that the thickness of the liquid crystal display screen slide incorporating the heat shield be no larger than the aperture 12 of the slide projector to enable the liquid crystal display screen slide to be inserted into the aperture.
  • the above apparatus provides for the display of pictures that are enlarged by the use of slide projector.
  • audio that may be provided either by the digislide or by a separate apparatus which has the capability to reproduce sound accompanying the moving picture.
  • This has however not been illustrated in the accompanying drawings.
  • the above illustration referred to the use of a liquid crystal display screen slide, other types of screens may be used.
  • the resolution of the final displayed image will depend on a number of factors such as the number of pixel's within the liquid crystal display screen slide and the final size of the displayed image.
  • low resolution liquid crystal display screen slides may well be suitable with high resolution screen slides only necessary for high quality images.
  • the only requirements is that the liquid crystal display screen slide be adapted to be used with a normal slide projector, and thus the size of the liquid crystal display screen slide is limited to that of conventional slides

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant de projeter des images sur un écran ou une surface au moyen d'un projecteur de diapositives classique. Les projecteurs projettent des images contenues dans des diapositives. On insère donc un afficheur à cristaux liquides conçu pour être utilisé comme une diapositive normale dans un projecteur de diapositives et on l'utilise pour projeter des images ou des images en mouvement. Le projecteur projette simplement les images contenues à l'intérieur de l'afficheur et les affiche sur une surface appropriée. La taille et l'emplacement de l'image projetée peuvent être commandés par la distance entre le projecteur et la surface, l'image pouvant être mise au point par le dispositif optique convenable. La distance et le nombre de pixels à l'intérieur de l'afficheur déterminent la résolution de l'image. L'invention propose ainsi un procédé et un dispositif simples et peu coûteux, qui permettent de projeter de grandes images, ce qui n'était jusque-là possible qu'avec des récepteurs de télévision grands et chers.
PCT/AU1998/000138 1997-03-05 1998-03-05 Afficheur a cristaux liquides pour projecteur de diapositives Ceased WO1998039917A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU60830/98A AU6083098A (en) 1997-03-05 1998-03-05 Liquid crystal display screen adapted for a slide projector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPO5448A AUPO544897A0 (en) 1997-03-05 1997-03-05 Video projector
AUPO5448 1997-03-05

Publications (1)

Publication Number Publication Date
WO1998039917A1 true WO1998039917A1 (fr) 1998-09-11

Family

ID=3799751

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1998/000138 Ceased WO1998039917A1 (fr) 1997-03-05 1998-03-05 Afficheur a cristaux liquides pour projecteur de diapositives

Country Status (2)

Country Link
AU (1) AUPO544897A0 (fr)
WO (1) WO1998039917A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001048545A1 (fr) * 1999-12-24 2001-07-05 Digislide International Pty Ltd Dispositif d'affichage a cristaux liquides ameliore pourvu de filtres conçu pour projecteur de diapositives

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4963001A (en) * 1988-08-23 1990-10-16 Citizen Watch Co., Ltd. Liquid crystal display device
US5049866A (en) * 1988-07-26 1991-09-17 Citizen Watch Co., Ltd. Liquid crystal display device
DE4234561A1 (de) * 1992-10-14 1994-04-21 Braun Camera Werk Bildumsetzer
US5317436A (en) * 1990-12-31 1994-05-31 Kopin Corporation A slide assembly for projector with active matrix moveably mounted to housing
US5376979A (en) * 1990-12-31 1994-12-27 Kopin Corporation Slide projector mountable light valve display

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5049866A (en) * 1988-07-26 1991-09-17 Citizen Watch Co., Ltd. Liquid crystal display device
US4963001A (en) * 1988-08-23 1990-10-16 Citizen Watch Co., Ltd. Liquid crystal display device
US5317436A (en) * 1990-12-31 1994-05-31 Kopin Corporation A slide assembly for projector with active matrix moveably mounted to housing
US5376979A (en) * 1990-12-31 1994-12-27 Kopin Corporation Slide projector mountable light valve display
DE4234561A1 (de) * 1992-10-14 1994-04-21 Braun Camera Werk Bildumsetzer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001048545A1 (fr) * 1999-12-24 2001-07-05 Digislide International Pty Ltd Dispositif d'affichage a cristaux liquides ameliore pourvu de filtres conçu pour projecteur de diapositives

Also Published As

Publication number Publication date
AUPO544897A0 (en) 1997-03-27

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