EP1287706A2 - Systeme de projection a eclairage par fibres optiques - Google Patents

Systeme de projection a eclairage par fibres optiques

Info

Publication number
EP1287706A2
EP1287706A2 EP01941540A EP01941540A EP1287706A2 EP 1287706 A2 EP1287706 A2 EP 1287706A2 EP 01941540 A EP01941540 A EP 01941540A EP 01941540 A EP01941540 A EP 01941540A EP 1287706 A2 EP1287706 A2 EP 1287706A2
Authority
EP
European Patent Office
Prior art keywords
light
projection display
fiber optic
display system
separation unit
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.)
Withdrawn
Application number
EP01941540A
Other languages
German (de)
English (en)
Inventor
Robert J. Saccomanno
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.)
Honeywell International Inc
Original Assignee
Honeywell International Inc
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 Honeywell International Inc filed Critical Honeywell International Inc
Priority claimed from PCT/US2001/016423 external-priority patent/WO2001091471A2/fr
Publication of EP1287706A2 publication Critical patent/EP1287706A2/fr
Withdrawn legal-status Critical Current

Links

Definitions

  • the prior art teaches a camera connected to an image processing function that individually modifies each projected image such as described in Johnson et al, (U.S. Patent 6,219,099).
  • the Johnson image processing function sacrifices a number of gray shades available for the displayed image in order to compensate for the lack of brightness and color uniformity between the projected tiles.
  • FIG. 1 shows an example of a conventional projection type display apparatus as discussed in Kodama, et al. (U.S. Patent 6,212,013), which would be used for a single display or for each display tile of a tiled display.
  • white light emitted from a light source unit 1 having a reflector 2 travels through lenses 3 and 4, converter 5, and lens 6, impinging upon a dichroic mirror DM1 which transmits a red light component R but reflects a green light component and a blue light component. Then the red light component transmitted by the dichroic mirror DM1 is reflected by a total reflection mirror Ml through a field lens 7R and a trimming filter TR into a red image display element 8R, in which the red light component is optically modulated according to an input signal. The red light component light thus optically modulated is combined with a modulated blue light component and a modulated green light component within a dichroic prism 9 and transmitted into a projection lens 10.
  • the blue light component B transmitted by the dichroic mirror DM2 travels via a condenser lens 11, a total reflection mirror M2, a relay lens 12, a total reflection mirror M3, and a field lens 7B into a blue image display element 8B, in which the blue light component is optically modulated according to an input signal.
  • the blue light component thus optically modulated is combined with the modulated red light component and the modulated green light component within the dichroic prism 9 and transmitted into the projection lens 10.
  • trichromatic light combined by the combining dichroic prism 9 is projected by the projection lens 10 toward a target screen or display tile, not shown.
  • My invention produces high-intensity white light from a common light source, separates this high-intensity white light into high-intensity primary color light components, and couples these high-intensity primary color light components to multiple projectors using fiber optic cables.
  • my projection display system does not use a separate lamp for each display tile and thereby achieves uniform display brightness and color uniformity across the entire projected display area, for example 9 feet high by 16 feet wide.
  • One novel aspect of my invention allows multiple light sources to be combined to provide lamp redundancy and yet act as a single light source with regard to both color and brightness uniformity.
  • FIG. 2 shows a projection display image that is further broken down into twelve individual display tiles.
  • FIG. 3 shows one illustrative embodiment of my invention using transmissive polysilicon (Poly-Si) liquid crystal (LC) imaging devices operating in parallel. Three such devices are used, per display tile, with each device assigned to a primary color selected from the group of red, green, and blue.
  • Poly-Si polysilicon
  • LC liquid crystal
  • FIG. 4 shows another illustrative embodiment of my invention displaying color subframes in a sequential manner.
  • a tiled projected image 100 is composed of individual display tiles 101A ...101N.
  • a preferred embodiment of my invention has a three-row by four-column array of display tiles as shown in FIG. 2.
  • Further embodiments contemplated can have different tile configurations including non-rectangular display tiles, such as hexagons, and tile configurations where the composite projected display is non-rectangular, such as a triangle.
  • each display tile 101 A ... 101N displays a portion of a complete image as projected from an associated display projector 400 A ... 400N.
  • Each display projector 400 comprises a projection lens assembly 401 and an imaging device 410.
  • the imaging device 410 comprises three transmissive polysilicon (Poly-Si) liquid crystal (LC) devices, consisting of a Blue LC device 411, a Green LC device 412, and a Red LC device 413, as well as combining optics 414.
  • Light is generated by a single light source or light engine 200, remote from the display projectors 400, and is routed by a first set of fiber optic cables 501 to a light separation unit 300.
  • the light separation unit 300 receives the light, dims the light according to an external control, not shown, and separates the light into primary color components such as blue, green, and red.
  • the primary color components are routed from the light separation unit 300 by a second set of fiber optic cables 502 to the display projectors 400 A ... 400N, where the display image is formed and projected onto display tiles 101 A ... 100N.
  • a common light engine 200 is used to provide illumination for all display tiles 100A ... 100N.
  • Another embodiment of my invention provides redundant light engines 200, where the outputs of the light engines 200 are combined in a combining device, not shown, prior to entry into the light separation unit 300.
  • a high- intensity lamp 201 such as an arc lamp, produces light that is reflected from elliptical mirrors 202 and exits through apertures 203.
  • the light exiting apertures 203 is focused and concentrated in trapezoids 204 and concentrators 205.
  • the light exits the light engine 200 via the concentrators 205.
  • Support assembly structure 210 maintains the required alignment for the components within the light engine 200.
  • the light routed to the light separation unit 300 is received into round-to-square morphing collimators 305.
  • Suitable round-to-square morphing collimators are described in U.S. Patent Application Serial No. 09/346,253.
  • the round-to-square morphing collimators 305 provide sufficient collimation to allow high reflectance of both s-polarized light and p-polarized light by the primary color light separation units 301, 302, and 303, such as color sensitive optical shutters manufactured by Digilens Inc. It is also important to have adequate homogenization of the light entering the light separation unit 300 in order that the flux entering the second set of fiber optic cables 502 is equally distributed.
  • Such homogenization may be accomplished between collimators 305 and the entrance to the first primary color light separation unit 301. i addition, due to losses in fibers 502, the path lengths and equivalent bends in the fibers 502 should remain relatively constant within a given projector 400 and between projectors 400A through 400N. hi another embodiment, the light is pre-polarized before entering the color sensitive beam splitters 301, 302, and 303.
  • light exiting the round-to-square morphing collimator 305 is separated into the primary color components by a 'Blue' color sensitive beam splitter 301, a 'Green' color sensitive beam splitter 302, and a 'Red' color sensitive beam splitter 303 respectively.
  • the 'Blue' color sensitive beam splitter 301, the 'Green' color sensitive beam splitter 302, and the 'Red' color sensitive beam splitter 303 provide color correction and dimming for each respective primary color component. Excess light, a by-product of the dimming and color correction function, is routed into beam dump 304.
  • this inventive configuration allows for the elimination of the yellow/orange band of light prevalent in metal halide and high pressure mercury arc lamps that leads to red desaturation by configuring beam splitters 301, 302, and 303 to pass the band of light between 575 to 600 nanometers in wavelength and by causing beam dump 304 to absorb this light band.
  • Each primary color, blue, green, and red, light component is routed from the 'Blue' color sensitive beam splitter 301, the 'Green' color sensitive beam splitter 302, and the 'Red' color sensitive optical shutter unit 303 respectively into one of a plurality of square-to-round morphing concentrators 306.
  • the round-to-square morphing collimator described Application Serial No. 09/346,253 maybe also used as a square-to-round morphing concentrators when light is input at the square surface face and exits through the round surface face.
  • the square-to-round morphing concentrators 306 are preferably tapered to optimize the optical throughput in consideration of the numerical aperture (NA) of the projectors 400 driven by the second set of fiber optic cables 502.
  • NA numerical aperture
  • twelve display projectors 400A ... 400N and thirty-six second fiber optic cables 502 are used to produce the projection display image 100 that is made up of twelve display tiles 101, as shown in FIG. 2, according to my invention.
  • the inventive configuration of the light separation unit including a plurality of color sensitive beam splitters allows for the separation of the visible light spectrum into more than the traditional three primary colors - red, green, and blue, h one embodiment of my invention, more than three light color components can be used, such as three 30nm wide green light components, e.g., 505nm-535nm, 535nm-565nm, and 565-595nm.
  • each display projector 400 A ...
  • each imaging device 410 further comprises a plurality of primary color imaging devices, such as a 'Blue' imaging device 411, a 'Green' imaging device 412, and a 'Red' imaging device 413.
  • a set of individual primary color images are formed at each imaging device 410 by the plurality of primary color imaging devices and are combined into a full-color image in color combiner device 414. In this 'frame parallel' embodiment, all individual color images are present simultaneously in color combiner device 414.
  • Multiple full- color images are projected from the display projectors 400A ... 400N via projection lens assemblies 401 and combine to form a large tiled display 100 made up of individual display tiles 101 A ... 101N as described above.
  • the light separation unit 300 receives the light inputs from the first set of fiber optic cables 501 and separates the light spatially into the individual fiber optic cables 502 of the second set, by means of the optical shutter devices 301, 302, and 303, as described above.
  • a light separation unit 350 separates the light sequentially into the separate color components and includes optical color sensitive devices 311, 312, and 313, each of which is caused to sequence through the primary colors, such as blue, green, and red, in a predetermined pattern by controller 320.
  • each display projector 450 includes a single imaging device 415, which serves to image each of the sequential light colors transmitted to it over the fiber optic cable 512.
  • this embodiment of my invention eliminates the need to associate color separation and recombination optics with each display projector, maintains the color balance between display projectors, and simplifies the construction of each display projector.
  • twelve display projectors 450 are utilized, each with an individual fiber optic cable 512 for the twelve display tiles 101, as shown in FIG. 2.
  • Each of the sequential shutter devices 311, 312, and 313 is associated with four of the proj ectors 450.
  • the visible light spectrum may be spatially separated into more than three 'primary' color light components.
  • MEMS micro electromechanical system
  • RCOS reflective liquid crystal on silicon

Landscapes

  • Projection Apparatus (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

L'invention concerne un affichage de projection composé de plusieurs pavés (101) et éclairé par plusieurs projecteurs (400), un pour chaque pavé. La lumière d'une source de lumière commune (200) est transmise à une unité (300) de séparation de lumière sur un premier ensemble de câbles (501) à fibres optiques, l'unité de séparation séparant la lumière en couleurs primaires individuelles spatialement ou séquentiellement. Les couleurs primaires individuelles sont alors transmises sur un second ensemble de câbles (502) à fibres optiques aux projecteurs individuels.
EP01941540A 2000-05-23 2001-05-22 Systeme de projection a eclairage par fibres optiques Withdrawn EP1287706A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US20638600P 2000-05-23 2000-05-23
US206386P 2000-05-23
PCT/US2001/016423 WO2001091471A2 (fr) 2000-05-23 2001-05-22 Systeme de projection a eclairage par fibres optiques

Publications (1)

Publication Number Publication Date
EP1287706A2 true EP1287706A2 (fr) 2003-03-05

Family

ID=22766138

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01941540A Withdrawn EP1287706A2 (fr) 2000-05-23 2001-05-22 Systeme de projection a eclairage par fibres optiques

Country Status (1)

Country Link
EP (1) EP1287706A2 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5654775A (en) * 1995-12-27 1997-08-05 Philips Electronics North America Corporation Three lamp, three light valve projection system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5654775A (en) * 1995-12-27 1997-08-05 Philips Electronics North America Corporation Three lamp, three light valve projection system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO0191471A3 *

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