CA2227920A1 - Method and device for eliminating edges of two projection pictures - Google Patents
Method and device for eliminating edges of two projection pictures Download PDFInfo
- Publication number
- CA2227920A1 CA2227920A1 CA002227920A CA2227920A CA2227920A1 CA 2227920 A1 CA2227920 A1 CA 2227920A1 CA 002227920 A CA002227920 A CA 002227920A CA 2227920 A CA2227920 A CA 2227920A CA 2227920 A1 CA2227920 A1 CA 2227920A1
- Authority
- CA
- Canada
- Prior art keywords
- plates
- lens
- projection
- pictures
- projection pictures
- 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.)
- Abandoned
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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/005—Diaphragms
-
- 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
- G03B21/13—Projectors for producing special effects at the edges of picture, e.g. blurring
-
- 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
- G03B37/00—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe
- G03B37/04—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe with cameras or projectors providing touching or overlapping fields of view
-
- 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
- H04N9/3147—Multi-projection systems
Abstract
A device for eliminating overlapped edges of two adjacent projection pictures includes a plurality of plates movably disposed in front of a projection lens and each of which has a sharp end so as to be moved toward the lens from a periphery of the lens. A diffraction will be occurred around the sharp ends of the plates to adjust brightness of an overlapped area of the two adjacent projection pictures.
Description
.
1 . M~lnO~ AND DEVICE FOR ELIMINATING EDGES OF TWO PROJECTION PICTURES
1 . M~lnO~ AND DEVICE FOR ELIMINATING EDGES OF TWO PROJECTION PICTURES
2 R~C~GROUND OF THE lNV~r.llON
3 1. Field of the Invention 4 The present invention relates to a device and a method for eliminating overlappe~ edges of two adjacent projection 6 pictures and, more particularly, to an improved device and 7 method which includes a comb filter disposed in front of a 8 lens of a projector so as to produce a diffraction feature to 9 adjust light distribution on an area of overlapped edges between two projection pictures.
11 2. Brief Description of the Prior Art 12 Generally, when a large projection picture or a visual 13 scene is needed to be projected on a screen, for example, 20 14 meters times 20 meters, a plurality of projectors are required to be arranged at suitable positions so that all the 16 projection pictures from the projectors can assemble a 17 complete scene. These projection pictures are arranged to 18 show on a screen with a specific sequence, that is to say, 19 these projection pictures are arranged side-by-side.
Referring to Figures 1 and 2, three projectors 10, 11, 12, 21 for example, are used to project three respective projection 22 pictures 100, 110, 120 on a screen, wherein each one of the 23 three projectors 10, 11, 12 has three projection lenses 3.
24 There will be two overlapped areas lOa, lOb formed on the screen. The area lOa is composed of a first boundary portion 26 101 from the projector 10 and a second boundary portion 111 27 from the projector 11, the area lOb is composed of the second 28 boundary portion 111 and a third boundary portion 121.
CA 02227920 l998-0l-27 .
1Accordingly, the two areas lOa, lOb will be brighter than that 2on the three projection pictures 100, 110, 120. These areas 3lOa, lOb are shown as two edges defined between any two 4adjacent pictures, and this seriously reduces a quality of 5the whole picture on the screen. Furthermore, the edges could . 6mis-guide the viewer when used in an imitation machine for 7pilots. A conventional method to eliminate overlapped edges 8on the screen is to dispose at least one "edges reducing gprocessing device" and adjust circuits of the projectors to 10adjust a brightness of the projection pictures. However, the 11edge reducing processing device uses a complicated circuit 12and many expensive parts so that the device has a high price 13which cannot be afforded by ordinary companies. Besides, such 14a device has a good performance on a plan screen but a curved 15screen. When the picture comprises a bright area such as the 16sky, and a dark area such as the land, the overlapped areas, 17if in t:he sky area, will show a brighter area, and if in the 18land area, will show a darker area. This is conventionally 19adjusted by adjusting a "gamma value" of the device by 20computer. Generally, there have 147,456 choices of the "gamma 21value" to be chosen and this definitely takes very much time.
22The present invention intends to provide an improved 23device and method for eliminating overlapped edges of two 24adjacent projection pictures to mitigate and/or obviate the 25above-mentioned problems.
26SU~AR~ OF THE INVENTION
27In one aspect of the present invention, there is 28provided a device for eliminating overlapped edges of two 1 adjacent projection pictures, comprising a plurality of plates 2 being adapted to be movably disposed in front of a projection 3 lens, each of the plates having a sharp end which is adapted 4 to be movably disposed relative to a periphery of the lens.
It is an object of the present invention to provide a 6 device which movably disposes a plurality of plates in front 7 of a lens of a projector to produce diffractions around the 8 plates to eliminate overlapped edges of two projection 9 pictures.
It is another object of the present invention to 11 provide a method to eliminate overlapped edges of two 12 projection pictures.
13 Other objects, advantages, and novel features of the 14 invention will become more apparent from the following detailed description when taken in conjunction with the 16 accompanying drawings.
18 Fig. 1 shows an illustrative view of three 19 convent:ional projectors and a screen on which two overlapped areas are formed;
21 Fig. 2 shows an illustrative view of three 22 convent:ional projection pictures and the two overlapped areas 23 on the screen as shown in Fig. 1;
24 Fig. 3 is a perspective view of a projector which has three devices in accordance with the present invention 26 respectively disposed in front of three lenses of the 27 projector;
28 Fig. 4 is an exploded view of the device in accordance 1with the present invention and the lens;
2Fig. 5 is a fragmentary view to show the plates and 3the rails of the frame;
4Fig. 6 is a front end elevational view to show the 5device of the present invention;
6Fig. 7 is an illustrative view to show the plates are 7adjusted when the projector is operated;
8Fig. 8 shows a flow chart to describe a method of the 9present: invention;
10Fig. 9 shows an illustrative view of three projectors 11each having the device of the present invention and a screen 12on which two overlapped areas are formed, and 13Fig. 10 shows an illustrative view of three projection 14pictures and the two overlapped areas which are eliminated by 15the device of the present invention.
17Referring to the drawings and initially to Figs. 3 18through 6, a projector 20 generally has three projection 19lenses 30, 31, 32 which respectively control base colors, 20red, green and blue to be projected on a screen 60 as shown 21in Fig. 9. A device in accordance with the present invention 22generally includes a frame 500 which is rectangular and 23fixedly connected to a tube 300 by a connector 501 with 24screws 502. The tube 300 has a lens 301 received therein so 25that light will projected to the screen 60 via the lens 301.
26The frame 500 is disposed in front of the lens 301 and has 27two opposite sides. Each of the two sides has two columns 50 28with a slot 51 defined between the two columns 50, each of .
1 the two columns 50 having a plurality of rails 52 extending 2 from an inner side thereof. A plurality of plates 40 each 3 have a sharp end 42 and two ribs 41 respectively extend from 4 two opposite sides of each of the plates 40 so that the two ribs 41 are supported ar;d movably disposed between two - 6 opposite rails 52. Each of the sharp ends 42 of plates 40 7 extend into an area of the lens 301 and are movably disposed 8 relative to a periphery of the lens 301.
g Referring to Fig. 7, when operating the projector 20, light is emitted through the lens 301 and the light can be 11 supposed to have a central portion H and two boundary 12 portions Hl. Referring to Figs. 9 and 10, an embodiment is 13 taken to describe how the device works, three projectors 20, 14 21 and 22 each have three lenses 30, 31, 32 so that there will three projection pictures 200, 210 and 220 shown in the 16 screen 60. Two overlapped areas 211, 212 are respectively 17 formed between the three pictures 200, 210 and 220, and each 18 of the overlapped areas 211, 212 are formed by the overlapped 19 boundary portions Hl.
Referring to Figs. 7 and 8, the plates 40 are moved 21 toward the corresponding lens 301 so that a diffraction is 22 occurred around the plates 40. The diffraction reduces 23 brightness of the boundary portions Hl so that the brightness 24 of the overlapped areas 211, 212 can be adjusted thereby.
Therefore, an operator may adjust the plates 40 by pushing 26 them toward the lens 302 or pulling them away from the lens 27 302 till a desired brightness is reached in the overlapped 28 areas 211, 212.
1 It is experienced that the device in accordance with 2 the present invention does not need highly trained or skilled 3 persons to operate and the cost thereof is much lower than 4 the conventional one. Furthermore, the device is well performed on a curved scree~n.
6 Although the invention has been explained in relation 7 to its preferred embodiment, it is to be understood that many 8 other possible modifications and variations can be made 9 without departing from the spirit and scope of the invention as hereinafter claimed.
11 2. Brief Description of the Prior Art 12 Generally, when a large projection picture or a visual 13 scene is needed to be projected on a screen, for example, 20 14 meters times 20 meters, a plurality of projectors are required to be arranged at suitable positions so that all the 16 projection pictures from the projectors can assemble a 17 complete scene. These projection pictures are arranged to 18 show on a screen with a specific sequence, that is to say, 19 these projection pictures are arranged side-by-side.
Referring to Figures 1 and 2, three projectors 10, 11, 12, 21 for example, are used to project three respective projection 22 pictures 100, 110, 120 on a screen, wherein each one of the 23 three projectors 10, 11, 12 has three projection lenses 3.
24 There will be two overlapped areas lOa, lOb formed on the screen. The area lOa is composed of a first boundary portion 26 101 from the projector 10 and a second boundary portion 111 27 from the projector 11, the area lOb is composed of the second 28 boundary portion 111 and a third boundary portion 121.
CA 02227920 l998-0l-27 .
1Accordingly, the two areas lOa, lOb will be brighter than that 2on the three projection pictures 100, 110, 120. These areas 3lOa, lOb are shown as two edges defined between any two 4adjacent pictures, and this seriously reduces a quality of 5the whole picture on the screen. Furthermore, the edges could . 6mis-guide the viewer when used in an imitation machine for 7pilots. A conventional method to eliminate overlapped edges 8on the screen is to dispose at least one "edges reducing gprocessing device" and adjust circuits of the projectors to 10adjust a brightness of the projection pictures. However, the 11edge reducing processing device uses a complicated circuit 12and many expensive parts so that the device has a high price 13which cannot be afforded by ordinary companies. Besides, such 14a device has a good performance on a plan screen but a curved 15screen. When the picture comprises a bright area such as the 16sky, and a dark area such as the land, the overlapped areas, 17if in t:he sky area, will show a brighter area, and if in the 18land area, will show a darker area. This is conventionally 19adjusted by adjusting a "gamma value" of the device by 20computer. Generally, there have 147,456 choices of the "gamma 21value" to be chosen and this definitely takes very much time.
22The present invention intends to provide an improved 23device and method for eliminating overlapped edges of two 24adjacent projection pictures to mitigate and/or obviate the 25above-mentioned problems.
26SU~AR~ OF THE INVENTION
27In one aspect of the present invention, there is 28provided a device for eliminating overlapped edges of two 1 adjacent projection pictures, comprising a plurality of plates 2 being adapted to be movably disposed in front of a projection 3 lens, each of the plates having a sharp end which is adapted 4 to be movably disposed relative to a periphery of the lens.
It is an object of the present invention to provide a 6 device which movably disposes a plurality of plates in front 7 of a lens of a projector to produce diffractions around the 8 plates to eliminate overlapped edges of two projection 9 pictures.
It is another object of the present invention to 11 provide a method to eliminate overlapped edges of two 12 projection pictures.
13 Other objects, advantages, and novel features of the 14 invention will become more apparent from the following detailed description when taken in conjunction with the 16 accompanying drawings.
18 Fig. 1 shows an illustrative view of three 19 convent:ional projectors and a screen on which two overlapped areas are formed;
21 Fig. 2 shows an illustrative view of three 22 convent:ional projection pictures and the two overlapped areas 23 on the screen as shown in Fig. 1;
24 Fig. 3 is a perspective view of a projector which has three devices in accordance with the present invention 26 respectively disposed in front of three lenses of the 27 projector;
28 Fig. 4 is an exploded view of the device in accordance 1with the present invention and the lens;
2Fig. 5 is a fragmentary view to show the plates and 3the rails of the frame;
4Fig. 6 is a front end elevational view to show the 5device of the present invention;
6Fig. 7 is an illustrative view to show the plates are 7adjusted when the projector is operated;
8Fig. 8 shows a flow chart to describe a method of the 9present: invention;
10Fig. 9 shows an illustrative view of three projectors 11each having the device of the present invention and a screen 12on which two overlapped areas are formed, and 13Fig. 10 shows an illustrative view of three projection 14pictures and the two overlapped areas which are eliminated by 15the device of the present invention.
17Referring to the drawings and initially to Figs. 3 18through 6, a projector 20 generally has three projection 19lenses 30, 31, 32 which respectively control base colors, 20red, green and blue to be projected on a screen 60 as shown 21in Fig. 9. A device in accordance with the present invention 22generally includes a frame 500 which is rectangular and 23fixedly connected to a tube 300 by a connector 501 with 24screws 502. The tube 300 has a lens 301 received therein so 25that light will projected to the screen 60 via the lens 301.
26The frame 500 is disposed in front of the lens 301 and has 27two opposite sides. Each of the two sides has two columns 50 28with a slot 51 defined between the two columns 50, each of .
1 the two columns 50 having a plurality of rails 52 extending 2 from an inner side thereof. A plurality of plates 40 each 3 have a sharp end 42 and two ribs 41 respectively extend from 4 two opposite sides of each of the plates 40 so that the two ribs 41 are supported ar;d movably disposed between two - 6 opposite rails 52. Each of the sharp ends 42 of plates 40 7 extend into an area of the lens 301 and are movably disposed 8 relative to a periphery of the lens 301.
g Referring to Fig. 7, when operating the projector 20, light is emitted through the lens 301 and the light can be 11 supposed to have a central portion H and two boundary 12 portions Hl. Referring to Figs. 9 and 10, an embodiment is 13 taken to describe how the device works, three projectors 20, 14 21 and 22 each have three lenses 30, 31, 32 so that there will three projection pictures 200, 210 and 220 shown in the 16 screen 60. Two overlapped areas 211, 212 are respectively 17 formed between the three pictures 200, 210 and 220, and each 18 of the overlapped areas 211, 212 are formed by the overlapped 19 boundary portions Hl.
Referring to Figs. 7 and 8, the plates 40 are moved 21 toward the corresponding lens 301 so that a diffraction is 22 occurred around the plates 40. The diffraction reduces 23 brightness of the boundary portions Hl so that the brightness 24 of the overlapped areas 211, 212 can be adjusted thereby.
Therefore, an operator may adjust the plates 40 by pushing 26 them toward the lens 302 or pulling them away from the lens 27 302 till a desired brightness is reached in the overlapped 28 areas 211, 212.
1 It is experienced that the device in accordance with 2 the present invention does not need highly trained or skilled 3 persons to operate and the cost thereof is much lower than 4 the conventional one. Furthermore, the device is well performed on a curved scree~n.
6 Although the invention has been explained in relation 7 to its preferred embodiment, it is to be understood that many 8 other possible modifications and variations can be made 9 without departing from the spirit and scope of the invention as hereinafter claimed.
Claims (5)
1. A device for eliminating overlapped edges of two adjacent projection pictures, comprising:
a plurality of plates being adapted to be movably disposed in front of a projection lens, each of said plates having a sharp end which is adapted to be movably disposed relative to a periphery of said lens.
a plurality of plates being adapted to be movably disposed in front of a projection lens, each of said plates having a sharp end which is adapted to be movably disposed relative to a periphery of said lens.
2. The device as claimed in claim 1 wherein a frame is adapted to be disposed in front of said lens and has two opposite sides, each of said two sides having a plurality of rails formed thereto so that said plates are guided along said rails.
3. The device as claimed in claim 2 wherein each of said two sides of said frame includes two columns with a slot defined between said two columns, each of said columns having said rails extending from an inner side thereof.
4. A method for eliminating overlapped edges of two adjacent projection pictures, comprising:
step 1: a plurality of plates being adapted to be disposed in front of a lens and relative to a periphery of said lens;
step 2: said plates being adapted to be moved toward relative to said lens so that a diffraction is occurred around said plates, and step 3: adjusting said plates till a desired brightness is reached in said overlapped edges.
step 1: a plurality of plates being adapted to be disposed in front of a lens and relative to a periphery of said lens;
step 2: said plates being adapted to be moved toward relative to said lens so that a diffraction is occurred around said plates, and step 3: adjusting said plates till a desired brightness is reached in said overlapped edges.
5. The method as claimed in claim 1 wherein each of said plates has a sharp end.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002227920A CA2227920A1 (en) | 1998-01-27 | 1998-01-27 | Method and device for eliminating edges of two projection pictures |
| FR9801154A FR2774481A1 (en) | 1998-01-27 | 1998-02-02 | Filter for preventing edge misalignment in adjacent projected images |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002227920A CA2227920A1 (en) | 1998-01-27 | 1998-01-27 | Method and device for eliminating edges of two projection pictures |
| FR9801154A FR2774481A1 (en) | 1998-01-27 | 1998-02-02 | Filter for preventing edge misalignment in adjacent projected images |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2227920A1 true CA2227920A1 (en) | 1999-07-27 |
Family
ID=31947244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002227920A Abandoned CA2227920A1 (en) | 1998-01-27 | 1998-01-27 | Method and device for eliminating edges of two projection pictures |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2227920A1 (en) |
| FR (1) | FR2774481A1 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002148710A (en) * | 2000-11-07 | 2002-05-22 | Olympus Optical Co Ltd | Multi-display device |
| JP2004507772A (en) * | 2000-07-03 | 2004-03-11 | アイマックス コーポレイション | Invisible seam alignment equipment and techniques for multiple projection displays |
| US6919990B2 (en) | 2000-04-18 | 2005-07-19 | Imax Corporation | Methods and systems for low loss separation and combination of light |
| US7224335B2 (en) | 2000-03-15 | 2007-05-29 | Imax Corporation | DMD-based image display systems |
| US7224411B2 (en) | 2000-03-31 | 2007-05-29 | Imax Corporation | Digital projection equipment and techniques |
| CN100399063C (en) * | 2002-11-21 | 2008-07-02 | 卡尔蔡司Smt股份有限公司 | Projection lens for a microlithographic projection exposure apparatus |
| US7651226B2 (en) | 2003-12-22 | 2010-01-26 | Thomson Licensing | Light masking for a segmented display system |
| WO2012076706A1 (en) | 2010-12-10 | 2012-06-14 | Global Immersion Limited | Optical mask for blending overlapping tiled images |
| US8251512B2 (en) | 2004-07-08 | 2012-08-28 | Imax Corporation | Equipment and methods for the display of high resolution images using multiple projection displays |
| US9888219B1 (en) | 2015-10-09 | 2018-02-06 | Electric Picture Display Systems | Adjustable optical mask plate and system for reducing brightness artifact in tiled projection displays |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4309549B2 (en) * | 2000-03-17 | 2009-08-05 | オリンパス株式会社 | Multi-display device, multi-display system, and adjustment method for multi-display device |
| AU4668901A (en) * | 2000-04-05 | 2001-10-15 | Nortel Networks Limited | Variable optical attenuator |
| JP2005513574A (en) * | 2001-12-21 | 2005-05-12 | シーメンス アクチエンゲゼルシヤフト | Projection system |
| US7278746B2 (en) | 2005-04-08 | 2007-10-09 | Barco N.V. | Motorized blend alignment tool |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2544116A (en) * | 1948-01-08 | 1951-03-06 | Vitarama Corp | Masking of marginal edges of overlapping images of mosaic pictures |
| FR2504695A1 (en) * | 1981-04-27 | 1982-10-29 | Macresy Creations Simon Sarl | Method of colour blending transparencies - has two protectors on to one surface which is both partly reflective and progressively transparent |
| DE3744060A1 (en) * | 1987-12-22 | 1989-07-13 | Juergen Krebs | Optical arrangement for high-performance slide projectors |
| JPH0354540A (en) * | 1989-07-24 | 1991-03-08 | Seiko Epson Corp | Multivision |
| DE4031053A1 (en) * | 1990-10-01 | 1992-04-02 | Friedrich Josef Sacher | Projection device using slide or video projectors - uses overlapping images with screening strips for image edges |
| WO1995025292A1 (en) * | 1994-03-17 | 1995-09-21 | Thomson Training & Simulation Limited | Edge-blending of projected images |
| EP0786687A1 (en) * | 1996-01-29 | 1997-07-30 | Hughes-Jvc Technology Corporation | Projected image blending for multiple images |
-
1998
- 1998-01-27 CA CA002227920A patent/CA2227920A1/en not_active Abandoned
- 1998-02-02 FR FR9801154A patent/FR2774481A1/en not_active Withdrawn
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7224335B2 (en) | 2000-03-15 | 2007-05-29 | Imax Corporation | DMD-based image display systems |
| US7224411B2 (en) | 2000-03-31 | 2007-05-29 | Imax Corporation | Digital projection equipment and techniques |
| US6919990B2 (en) | 2000-04-18 | 2005-07-19 | Imax Corporation | Methods and systems for low loss separation and combination of light |
| JP2004507772A (en) * | 2000-07-03 | 2004-03-11 | アイマックス コーポレイション | Invisible seam alignment equipment and techniques for multiple projection displays |
| US7193654B2 (en) | 2000-07-03 | 2007-03-20 | Imax Corporation | Equipment and techniques for invisible seaming of multiple projection displays |
| JP2002148710A (en) * | 2000-11-07 | 2002-05-22 | Olympus Optical Co Ltd | Multi-display device |
| CN100399063C (en) * | 2002-11-21 | 2008-07-02 | 卡尔蔡司Smt股份有限公司 | Projection lens for a microlithographic projection exposure apparatus |
| US7651226B2 (en) | 2003-12-22 | 2010-01-26 | Thomson Licensing | Light masking for a segmented display system |
| US8251512B2 (en) | 2004-07-08 | 2012-08-28 | Imax Corporation | Equipment and methods for the display of high resolution images using multiple projection displays |
| WO2012076706A1 (en) | 2010-12-10 | 2012-06-14 | Global Immersion Limited | Optical mask for blending overlapping tiled images |
| US9182656B2 (en) | 2010-12-10 | 2015-11-10 | Electrosonic Limited | Optical mask for blending overlapping tiled images |
| US9888219B1 (en) | 2015-10-09 | 2018-02-06 | Electric Picture Display Systems | Adjustable optical mask plate and system for reducing brightness artifact in tiled projection displays |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2774481A1 (en) | 1999-08-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |