WO2004099842A1 - Image display apparatus - Google Patents

Image display apparatus Download PDF

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Publication number
WO2004099842A1
WO2004099842A1 PCT/GB2004/001667 GB2004001667W WO2004099842A1 WO 2004099842 A1 WO2004099842 A1 WO 2004099842A1 GB 2004001667 W GB2004001667 W GB 2004001667W WO 2004099842 A1 WO2004099842 A1 WO 2004099842A1
Authority
WO
WIPO (PCT)
Prior art keywords
projection screen
rear projection
display apparatus
image display
light
Prior art date
Application number
PCT/GB2004/001667
Other languages
French (fr)
Inventor
Nicholas Richard Coates
Original Assignee
Seos Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seos Limited filed Critical Seos Limited
Priority to GB0520951A priority Critical patent/GB2415794B/en
Publication of WO2004099842A1 publication Critical patent/WO2004099842A1/en

Links

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
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G03B21/606—Projection screens characterised by the nature of the surface for relief projection
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/02—Catoptric systems, e.g. image erecting and reversing system
    • G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
    • 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
    • G03B21/10—Projectors with built-in or built-on screen
    • 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
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G03B21/62—Translucent screens
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B9/00—Simulators for teaching or training purposes
    • G09B9/02—Simulators for teaching or training purposes for teaching control of vehicles or other craft
    • G09B9/08—Simulators for teaching or training purposes for teaching control of vehicles or other craft for teaching control of aircraft, e.g. Link trainer
    • G09B9/30—Simulation of view from aircraft
    • G09B9/32—Simulation of view from aircraft by projected image

Definitions

  • This invention relates to image display apparatus and, more especially, this invention relates to collimated image display apparatus giving improved contrast.
  • collimated display apparatus can be produced using a rear projection screen and a curved collimating mirror.
  • the collimated display apparatus is typically used in flight simulators and in other simulators requiring collimated images.
  • the rear projection screen is usually spherical in shape, and it usually has a radius of approximately half that of the curved mirror.
  • a user views the image projected onto the rear projection screen via the curved collimating mirror.
  • the curved collimating mirror is tilted with respect to the rear projection screen.
  • Such off axis image display apparatus has traditionally provided low contrast displays, due to adverse effects caused by light being reflected off the rear surface of the rear projection screen and light being reflected from the curved collimating mirror back to the front surface of the rear projection screen.
  • Flat rear projection screens have been known for many years, for example from USA Patent No. 2378252.
  • fresnel lenses are used to redirect the incident light in a direction which is close to orthogonal to the flat rear projection screen.
  • the loss of contrast in known off axis collimating displays is caused by some of the light incident on the rear of the rear projection screen being reflected and dispersed backwards, with a proportion of this light falling on other areas of the rear projection screen, and hence being transmitted by these areas resulting in a loss of contrast.
  • image display apparatus comprising a curved rear projection screen, at least one projector, and a curved collimating mirror, the curved rear projection screen having a convex side, a concave side, a transparent substrate, a light absorbing layer which is on a concave side of the transparent substrate, and a plurality of refracting spherules which are located in the light absorbing layer and which are for providing apertures in the light absorbing layer for directing light incident on the concave side of the rear projection screen to the convex side of the rear projection screen, the image display apparatus being such that the projector projects an image at the concave side of the rear projection screen, and a user views the image produced on the convex side of the rear projection screen via the collimating mirror.
  • the image display apparatus of the present invention may provide collimated display with significantly improved contrast.
  • the image display apparatus of the present invention may be an off axis image display apparatus.
  • the image display apparatus of the present invention may be one in which the projector is positioned close to the centre of curvature of the rear projection screen.
  • the present invention also provides a flight simulator comprising the image display apparatus of the invention.
  • the present invention further provides a vehicle simulator comprising the image display apparatus of the invention.
  • the image display apparatus of the present invention may have at least one projector for projecting images onto the concave side of the rear projection screen.
  • the projector or projectors are preferably positioned closed to the centre of curvature of the rear projection screen, and therefore light from the projector or projectors is incident on the concave side of the rear projection screen, essentially orthogonal to the screen. Light will only pass through the refracting spherules if the light is incident on the rear of the projection screen at an angle that is orthogonal or close to orthogonal to the screen surface.
  • Positioning of the projectors at or near the centre of curvature of the rear projection screen eliminates the need for a fresnel lens.
  • the loss of contrast in known off axis collimating displays is caused by some of the light incident on the rear of the rear projection screen being reflected and dispersed backwards, with a proportion of this light falling on other areas of the screen and hence being transmitted by these areas, resulting in a loss of contrast. Since the rear projection screen of the present invention only transmits light that is incident at or near a direction orthogonal to the screen, any light that is reflected from other parts of the rear projection screen will not be transmitted as it is incident on the rear projection screen at an acute angle.
  • the rear projection screen preferably has a black appearance to the user if no image is projected onto the concave rear surface of the curved collimating mirror.
  • the screen absorbs ambient light incident upon the screen and in the present invention, the screen further absorbs light reflected back towards the screen by the curved mirror. Therefore loss of contrast from this reflected light is reduced.
  • Figure 1 is a vertical cross section through a known off axis collimated display apparatus, with one projector;
  • Figure 2 is a horizontal cross section through known off axis collimated display apparatus, with three projectors;
  • Figure 3 shows the layout of Figure 1 and the light reflected from a curved mirror employed in Figure 1 ;
  • Figure 4 shows a rear projection screen with two projectors and light reflected by the rear projection screen; and Figure 5 shows a cross section through the curved rear projection screen.
  • the display apparatus 2 usually has one or more projectors, and one of these projectors is shown.
  • the projector 4 projects an image onto the rear concave surface of the rear projection screen 6.
  • Light is transmitted by the rear projection screen 6 and it is reflected by a curved mirror 8 towards a viewer 10.
  • the collimation distance in the display apparatus 2 is determined by the relationship between the curved rear projection screen 6 and the curved mirror 8.
  • Figure 2 is a horizontal cross section through known off axis collimated display apparatus 12.
  • the display apparatus 12 utilises three projectors 14, 16 and 18 which project onto a rear concave surface of a rear projection screen 20. Increased horizontal fields of view are able to be accommodated by the use of more than one projector 14, 16, 18.
  • the projectors 14, 16, 18 illuminate adjacent portions of the rear projection screen 20. This is usually effected with images partly overlapping. Light is reflected to the observer by a curved collimating mirror 22.
  • Figure 2 also shows that the majority of the light incident on the rear, concave surface of the rear projection screen 20 is transmitted towards the mirror 22.
  • Figure 3 is a vertical cross section through off axis collimated display apparatus 38.
  • the display apparatus 38 has a projector 40 illuminating a rear projection screen 42.
  • the light transmitted by the rear projection screen 42 is reflected by a curved mirror 44 towards an observer 46.
  • the light is partially scattered on reflection, and some of the reflected light 48 is reflected back towards the convex surface of the rear projection screen 42. This causes loss of contrast in the display obtained from the off axis collimated display apparatus 38.
  • FIG. 4 shows image display apparatus 50 of the present invention.
  • the image display apparatus 50 contains a projector 52, and other projectors 60, only one of which is shown for ease of illustration.
  • the image display apparatus 50 has a rear projection screen 54.
  • the rear projection screen 54 has a centre of curvature 56. Since the projectors 52, 60 are positioned close to the centre of curvature 56 of the rear projection screen 54, light from the projectors is incident on a concave surface of the rear projection screen 54 at or close to an orthogonal angle and is transmitted by the rear projection screen 54. However, some light 58 is reflected backwards from the concave surface of the rear projection screen 54.
  • Figure 4 also shows light 62 that has been reflected back from a curved collimating mirror 66 towards the rear projection screen 54.
  • This light 62 which is incident on a convex surface of the rear projection screen 54, is not reflected by the rear projection screen 54 because it is absorbed by a black layer. Therefore there is no loss of contrast due to light reflected back onto the rear projection screen 54 from the curved collimating mirror.
  • FIG. 5 shows an enlarged cross section of the rear projection screen 54.
  • the rear projection screen 54 comprises a clear substrate 68 with a convex surface 70 and a concave surface 72.
  • the light absorbing layer 74 is on the concave surface 72 of the transparent substrate.
  • the refracting spherules 78 are shown in cross section. An adjacent row of refracting spherules 76 is also shown.
  • the refracting spherules extend into the light absorbing layer 74 such that they contact the transparent substrate at the points 80. These points 80 provide apertures in the light absorbing layer 74 for directing light from a concave side of the rear projection screen 54 to a convex side of the rear projection screen 54.
  • the curved rear projection screen 54 can be manufactured as a flat screen and then formed into the desired shape.
  • a substrate for the curved rear projection screen can be formed to the desired shape, and then a light absorbing layer and required spherules can be applied to the concave surface of the substrate.
  • the image display apparatus of the present invention has significant advantages over known off axis collimating displays.
  • the display apparatus of the present invention provides increased image contrast compared with the image contrast of known off axis collimated displays.

Abstract

Image display apparatus (50) comprising a curved rear projection screen (54), at least one projector (52), and a curved collimating mirror (66), the curved rear projection screen (54) having a convex side, a concave side, a transparent substrate (68), a light absorbing layer (74) which is on a concave side (72) of the transparent substrate (68), and a plurality of refracting spherules (78) which are located in the light absorbing layer (74) and which are for providing apertures in the light absorbing layer (74) for directing light incident on the concave side of the rear projection screen (54) to the convex side of the rear projection screen (54), the image display apparatus (50) being such that the projector (52) projects an image at the concave side of the rear projection screen (54), and a user views the image produced on the convex side of the rear projection screen (54) via the collimating mirror (66).

Description

IMAGE DISPLAY APPARATUS
This invention relates to image display apparatus and, more especially, this invention relates to collimated image display apparatus giving improved contrast.
It is known that collimated display apparatus can be produced using a rear projection screen and a curved collimating mirror. The collimated display apparatus is typically used in flight simulators and in other simulators requiring collimated images. The rear projection screen is usually spherical in shape, and it usually has a radius of approximately half that of the curved mirror. A user views the image projected onto the rear projection screen via the curved collimating mirror. The curved collimating mirror is tilted with respect to the rear projection screen. Such off axis image display apparatus has traditionally provided low contrast displays, due to adverse effects caused by light being reflected off the rear surface of the rear projection screen and light being reflected from the curved collimating mirror back to the front surface of the rear projection screen.
Flat rear projection screens have been known for many years, for example from USA Patent No. 2378252. When the known flat projection screens are used with projectors positioned close to the flat rear projection screens, fresnel lenses are used to redirect the incident light in a direction which is close to orthogonal to the flat rear projection screen. The loss of contrast in known off axis collimating displays is caused by some of the light incident on the rear of the rear projection screen being reflected and dispersed backwards, with a proportion of this light falling on other areas of the rear projection screen, and hence being transmitted by these areas resulting in a loss of contrast.
It is an aim of the present invention to obviate or reduce the above mentioned problems.
Accordingly, in one non-limiting embodiment of the present invention there is provided image display apparatus comprising a curved rear projection screen, at least one projector, and a curved collimating mirror, the curved rear projection screen having a convex side, a concave side, a transparent substrate, a light absorbing layer which is on a concave side of the transparent substrate, and a plurality of refracting spherules which are located in the light absorbing layer and which are for providing apertures in the light absorbing layer for directing light incident on the concave side of the rear projection screen to the convex side of the rear projection screen, the image display apparatus being such that the projector projects an image at the concave side of the rear projection screen, and a user views the image produced on the convex side of the rear projection screen via the collimating mirror.
The image display apparatus of the present invention may provide collimated display with significantly improved contrast. The image display apparatus of the present invention may be an off axis image display apparatus. The image display apparatus of the present invention may be one in which the projector is positioned close to the centre of curvature of the rear projection screen.
The present invention also provides a flight simulator comprising the image display apparatus of the invention. The present invention further provides a vehicle simulator comprising the image display apparatus of the invention.
The image display apparatus of the present invention may have at least one projector for projecting images onto the concave side of the rear projection screen. The projector or projectors are preferably positioned closed to the centre of curvature of the rear projection screen, and therefore light from the projector or projectors is incident on the concave side of the rear projection screen, essentially orthogonal to the screen. Light will only pass through the refracting spherules if the light is incident on the rear of the projection screen at an angle that is orthogonal or close to orthogonal to the screen surface.
Positioning of the projectors at or near the centre of curvature of the rear projection screen eliminates the need for a fresnel lens. As mentioned above, the loss of contrast in known off axis collimating displays is caused by some of the light incident on the rear of the rear projection screen being reflected and dispersed backwards, with a proportion of this light falling on other areas of the screen and hence being transmitted by these areas, resulting in a loss of contrast. Since the rear projection screen of the present invention only transmits light that is incident at or near a direction orthogonal to the screen, any light that is reflected from other parts of the rear projection screen will not be transmitted as it is incident on the rear projection screen at an acute angle. Also, some loss of contrast in known displays is caused by a proportion of the light reflected by the curved mirror being reflected back towards the convex surface of the rear projection screen. In the present invention, the rear projection screen preferably has a black appearance to the user if no image is projected onto the concave rear surface of the curved collimating mirror. The screen absorbs ambient light incident upon the screen and in the present invention, the screen further absorbs light reflected back towards the screen by the curved mirror. Therefore loss of contrast from this reflected light is reduced.
Use of a rear projection screen in an off axis collimator has significant advantages over known rear projection screens, and in particular, the display will have greatly improved contrast.
An embodiment of the invention will now be described solely by way of example and with reference to the accompanying drawings in which:
Figure 1 is a vertical cross section through a known off axis collimated display apparatus, with one projector;
Figure 2 is a horizontal cross section through known off axis collimated display apparatus, with three projectors;
Figure 3 shows the layout of Figure 1 and the light reflected from a curved mirror employed in Figure 1 ;
Figure 4 shows a rear projection screen with two projectors and light reflected by the rear projection screen; and Figure 5 shows a cross section through the curved rear projection screen.
Referring to Figure 1, there is shown known off axis collimated display apparatus 2. The display apparatus 2 usually has one or more projectors, and one of these projectors is shown. The projector 4, projects an image onto the rear concave surface of the rear projection screen 6. Light is transmitted by the rear projection screen 6 and it is reflected by a curved mirror 8 towards a viewer 10. The collimation distance in the display apparatus 2 is determined by the relationship between the curved rear projection screen 6 and the curved mirror 8.
Figure 2 is a horizontal cross section through known off axis collimated display apparatus 12. The display apparatus 12 utilises three projectors 14, 16 and 18 which project onto a rear concave surface of a rear projection screen 20. Increased horizontal fields of view are able to be accommodated by the use of more than one projector 14, 16, 18. The projectors 14, 16, 18 illuminate adjacent portions of the rear projection screen 20. This is usually effected with images partly overlapping. Light is reflected to the observer by a curved collimating mirror 22. Figure 2 also shows that the majority of the light incident on the rear, concave surface of the rear projection screen 20 is transmitted towards the mirror 22. Light from the projectors 14, 16, 18 incident on the rear concave surface of the rear projection screen 20 and also the majority of the light 26, 28, 30 is transmitted towards the mirror 22. However, a portion of the light 32, 34, 36 is reflected back towards the rear projection screen 20. Light that has been reflected backwards from the rear projection screen 20 spreads, and some of this light is incident on other parts of the rear projection screen 20, causing a reduction in contrast.
Figure 3 is a vertical cross section through off axis collimated display apparatus 38. The display apparatus 38 has a projector 40 illuminating a rear projection screen 42. The light transmitted by the rear projection screen 42 is reflected by a curved mirror 44 towards an observer 46. However, the light is partially scattered on reflection, and some of the reflected light 48 is reflected back towards the convex surface of the rear projection screen 42. This causes loss of contrast in the display obtained from the off axis collimated display apparatus 38.
Figure 4 shows image display apparatus 50 of the present invention. The image display apparatus 50 contains a projector 52, and other projectors 60, only one of which is shown for ease of illustration. The image display apparatus 50 has a rear projection screen 54. The rear projection screen 54 has a centre of curvature 56. Since the projectors 52, 60 are positioned close to the centre of curvature 56 of the rear projection screen 54, light from the projectors is incident on a concave surface of the rear projection screen 54 at or close to an orthogonal angle and is transmitted by the rear projection screen 54. However, some light 58 is reflected backwards from the concave surface of the rear projection screen 54. It can be seen that this reflected light 58 is incident upon other portions of the rear projection screen 54 at an acute angle and is consequently not transmitted by the rear projection screen 54. Therefore there is no reduction in contrast. Figure 4 also shows light 62 that has been reflected back from a curved collimating mirror 66 towards the rear projection screen 54. This light 62, which is incident on a convex surface of the rear projection screen 54, is not reflected by the rear projection screen 54 because it is absorbed by a black layer. Therefore there is no loss of contrast due to light reflected back onto the rear projection screen 54 from the curved collimating mirror.
Figure 5 shows an enlarged cross section of the rear projection screen 54. The rear projection screen 54 comprises a clear substrate 68 with a convex surface 70 and a concave surface 72. The light absorbing layer 74 is on the concave surface 72 of the transparent substrate. The refracting spherules 78 are shown in cross section. An adjacent row of refracting spherules 76 is also shown. The refracting spherules extend into the light absorbing layer 74 such that they contact the transparent substrate at the points 80. These points 80 provide apertures in the light absorbing layer 74 for directing light from a concave side of the rear projection screen 54 to a convex side of the rear projection screen 54.
The curved rear projection screen 54 can be manufactured as a flat screen and then formed into the desired shape. Alternatively, a substrate for the curved rear projection screen can be formed to the desired shape, and then a light absorbing layer and required spherules can be applied to the concave surface of the substrate.
It will be appreciated from the description of Figures 4 and 5 that the image display apparatus of the present invention has significant advantages over known off axis collimating displays. In particular, the display apparatus of the present invention provides increased image contrast compared with the image contrast of known off axis collimated displays.
It is to be appreciated that the embodiment of the invention described above with reference to Figures 4 and 5 has been given by way of example only and that modifications may be effected.

Claims

1. Image display apparatus comprising a curved rear projection screen, at least one projector, and a curved collimating mirror, the curved rear projection screen having a convex side, a concave side, a transparent substrate, a light absorbing layer which is on a concave side of the transparent substrate, and a plurality of refracting spherules which are located in the light absorbing layer and which are for providing apertures in the light absorbing layer for directing light incident on the concave side of the rear projection screen to the convex side of the rear projection screen, the image display apparatus being such that the projector projects an image at the concave side of the rear projection screen, and a user views the image produced on the convex side of the rear projection screen via the collimating mirror.
2. Image display apparatus according to claim 1 in which the projector is positioned close to the centre of curvature of the rear projection screen.
3. Image display apparatus substantially as herein described with reference to Figures 4 and 5 of the accompanying drawings.
4. A flight simulator comprising image display apparatus according to any one of the preceding claims.
5. A vehicle simulator comprising image display apparatus according to any one of claim 1-3.
PCT/GB2004/001667 2003-05-09 2004-04-16 Image display apparatus WO2004099842A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0520951A GB2415794B (en) 2003-05-09 2004-04-16 Image display apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0310702A GB0310702D0 (en) 2003-05-09 2003-05-09 Image display apparatus
GB0310702.6 2003-05-09

Publications (1)

Publication Number Publication Date
WO2004099842A1 true WO2004099842A1 (en) 2004-11-18

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WO (1) WO2004099842A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006025638A1 (en) * 2006-05-29 2007-12-20 Jenoptik Ldt Gmbh Image projection device for collimation arrangement, has laser projector positioned near center of curvature of rear projection screen
DE102008033756A1 (en) 2007-07-27 2009-03-05 Ldt Laser Display Technology Gmbh Method and apparatus for projecting an image onto a screen
CN105045028A (en) * 2015-08-12 2015-11-11 中国人民解放军95995部队 Paraxial virtual image display system with superwide vertical field angle
US9191659B2 (en) 2011-11-16 2015-11-17 Christie Digital Systems Usa, Inc. Collimated stereo display system
US9316837B2 (en) 2014-04-22 2016-04-19 Christie Digital Systems Usa, Inc. Display stand
CN112513709A (en) * 2018-07-24 2021-03-16 斯科蒂克私人有限公司 Collimated visual display system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909523A (en) * 1974-04-08 1975-09-30 Goodyear Aerospace Corp CRT projection lens
US6344263B1 (en) * 1998-03-30 2002-02-05 3M Innovative Properties Company Light dispersing film and method of manufacture
EP1265207A1 (en) * 1996-05-31 2002-12-11 Raytheon Company Backscreen edge contouring for off-axis large field of view displays

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2378252A (en) * 1942-06-30 1945-06-12 Eastman Kodak Co Projection screen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909523A (en) * 1974-04-08 1975-09-30 Goodyear Aerospace Corp CRT projection lens
EP1265207A1 (en) * 1996-05-31 2002-12-11 Raytheon Company Backscreen edge contouring for off-axis large field of view displays
US6344263B1 (en) * 1998-03-30 2002-02-05 3M Innovative Properties Company Light dispersing film and method of manufacture

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006025638A1 (en) * 2006-05-29 2007-12-20 Jenoptik Ldt Gmbh Image projection device for collimation arrangement, has laser projector positioned near center of curvature of rear projection screen
DE102008033756A1 (en) 2007-07-27 2009-03-05 Ldt Laser Display Technology Gmbh Method and apparatus for projecting an image onto a screen
US9191659B2 (en) 2011-11-16 2015-11-17 Christie Digital Systems Usa, Inc. Collimated stereo display system
US9316837B2 (en) 2014-04-22 2016-04-19 Christie Digital Systems Usa, Inc. Display stand
CN105045028A (en) * 2015-08-12 2015-11-11 中国人民解放军95995部队 Paraxial virtual image display system with superwide vertical field angle
CN112513709A (en) * 2018-07-24 2021-03-16 斯科蒂克私人有限公司 Collimated visual display system

Also Published As

Publication number Publication date
GB2415794A8 (en) 2006-02-10
GB2415794A (en) 2006-01-04
GB2415794B (en) 2006-07-26
GB0310702D0 (en) 2003-06-11
GB0520951D0 (en) 2005-11-23

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