US20040188875A1 - Methods of forming localized positive optical power units a substrate - Google Patents
Methods of forming localized positive optical power units a substrate Download PDFInfo
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- US20040188875A1 US20040188875A1 US10/824,672 US82467204A US2004188875A1 US 20040188875 A1 US20040188875 A1 US 20040188875A1 US 82467204 A US82467204 A US 82467204A US 2004188875 A1 US2004188875 A1 US 2004188875A1
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- substrate
- master
- optical power
- light
- power units
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1876—Diffractive Fresnel lenses; Zone plates; Kinoforms
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1876—Diffractive Fresnel lenses; Zone plates; Kinoforms
- G02B5/188—Plurality of such optical elements formed in or on a supporting substrate
- G02B5/1885—Arranged as a periodic array
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- 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
- G03B21/625—Lenticular translucent screens
Definitions
- the present invention relates to projection systems and projection screens and more particularly to an improved screen apparatus that includes a double layered screen construction.
- Projected light may be used to display images on large surfaces, such as large computer displays or television screens.
- a front projection system an image beam is projected from an image source onto the front side of a reflection-type, angle transforming screen, which then reflects the light toward a viewer positioned in front of the screen.
- a rear projection system the image beam is projected onto the rear side of a transmission-type, angle transforming screen and transmitted toward a viewer located in front of the screen.
- wide angle projection systems that include a screen apparatus 10 are known to optimally use a conventional Fresnel lens 11 in combination with some diffusing element, such as a substrate covered with glass beads (e.g., a type of diffuser or diffusive screen) 12 .
- the combination forms an imaging screen that produces an image.
- the Fresnel lens 11 and the diffuser assembly 12 are held in relatively rigid or semi-rigid spaced apart relation to assure proper operation of the combination.
- Such screens known generally in the art as “black matrix bead” or “BMB” screens, are commercially available from Minnesota Mining & Manufacturing Company and others.
- Fresnel lenses used in devices such as overhead projectors and projection television are commercially available from, for example, Fresnel Optics, Minnesota Mining & Manufacturing Company, and others.
- the Fresnel lens 11 element is constructed to provide the optical properties of a much thicker lens, however, with smaller thickness and weight. Concentric steps or discontinuities 11 A allow these optical and physical properties to be realized. Each of the steps has a curved profile, in cross-section, that exhibits optical power to redirect incident light 13 .
- the cut-out sections that define the steps reduce the overall size and weight.
- the Fresnel lens 11 receives the incoming light 13 from a projection image engine or image projector 14 (e.g., a liquid crystal display imager, a light source, and a projection lens that produce image light in response to input video or other signals).
- a projection image engine or image projector 14 e.g., a liquid crystal display imager, a light source, and a projection lens that produce image light in response to input video or other signals.
- the break in the light path of the light 13 shown in FIG. 1 is included to recognize that the. light 13 may be processed or filtered, for example, projected by the projection or other lens (not shown), and is generally indicated by numeral 13 A.
- the screen apparatus 10 and the image engine 14 are arranged such that a light beam exiting the Fresnel lens 11 is collimated, as shown by parallel rays of light 15 .
- the collimated rays 15 pass across an air gap 16 to a matrix of glass beads 17 - 21 in the diffuser assembly 12 .
- the glass beads 17 - 21 are mounted upon an adhesive black mask layer 22 that is on a first surface 23 of a substrate 24 of the diffuser assembly 12 .
- the substrate 24 is light transparent so that a viewer 27 can see an image from the light 25 that passes through a surface 26 (e.g., an acrylic, polystyrene, other polymer, or like surface) of the screen apparatus 10 .
- the exiting rays are now wide angle transformed for wide angle viewing.
- the screen apparatus 10 can be an “touch screen” television screen, having a large diagonal dimension, for example, substantially 60 inches, or a computer monitor screen.
- BMB-type screens that affect their manufacturing quality control. Uniformity of bead diameter has been problematic with the BMB screens of the type having beads placed directly upon a substrate. In these screens the beads are, for example, attached to the substrate by an adhesive. Some adhesives used in BMB screens define a black matrix that can have holes. These holes may allow light to pass through at improper locations. Another problem with bead placement upon a matrix is associated with packing density. Often it is difficult to insure that the beads are densely packed enough to avoid light transmission non-uniformity or image non-uniformity. The beads themselves may also suffer from diameter variations, transparency differences, and surface glare, and may include relatively large inactive portions and therefore non-useful parts.
- the present invention is directed to avoid or substantially avoid some or all of the problems set forth above, as well as other problems.
- An object of the invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
- embodiments of the invention feature a screen apparatus that includes a first layer for substantially collimating light, a second continuous layer positioned proximate the first layer for receiving the substantially collimated light from the first layer and for converging the received substantially collimated light, and a third layer adjacent the second layer, having a plurality of openings for receiving and altering the converging light as image light.
- the second layer includes an array of bead-like members.
- FIG. 1 is a side, cross-sectional view of a prior art BMB projection screen that uses a Fresnel lens in combination with a spaced apart bead covered diffuser;
- FIG. 2 is a side, cross-sectional view of a screen apparatus in accordance with an embodiment of the invention.
- FIG. 3 is a partial perspective view of a portion of the embodiment in FIG. 2;
- FIG. 4A is a cross-sectional view of a master tool for use in constructing a screen apparatus in accordance with an embodiment of the invention
- FIG. 4B is a perspective view of an apparatus that uses a master tool in a process for constructing a screen apparatus in accordance with an embodiment of the invention
- FIG. 4C is a perspective view of an apparatus used in making a master tool for use in constructing a screen apparatus in accordance with an embodiment of the invention
- FIG. 5 is a side, cross-sectional view of a screen apparatus in accordance with an embodiment of the invention.
- FIGS. 6 and 7 are side, cross-sectional views of display apparatuses in accordance with embodiments of the invention.
- the present invention provides an improved projection screen apparatus, such as for use in a rear projection television or computer monitor that eliminates or substantially reduces the problems and shortcomings of the prior art BMB-type projection screens.
- the present invention provides a screen apparatus that includes a micro-replicated bead-like surface on a layer of material that receives incoming light from a lens layer, such as a Fresnel lens.
- a screen apparatus 30 is shown in accordance with an embodiment of the invention.
- the screen apparatus 30 includes planar members, a first layer 31 and a second layer of material 75 , which can be parallel to each other, and are spaced apart by an air gap 74 .
- the first layer 31 forms a collimating optical element (i.e., a collimator) or lens layer.
- the first layer of material 31 can be in the form of a lens, such as a Fresnel lens.
- the layer 31 provides opposed surfaces 33 , 34 .
- Incoming light radiation 32 from the image engine 14 which may be diverging (or converging in other embodiments), strikes the first surface 33 of the first layer 31 and exits the second surface 34 as substantially or completely collimated beam radiation.
- the collimated light 35 includes rays that are substantially parallel so that the beam does not converge or diverge appreciably.
- the image light 32 is similar to the image light 13 in FIG. 1, with a break labeled 32 A in the light path being analogous to the break 13 A in FIG. 1.
- the light 32 may be processed or projected by a projection or other lens (not shown) to the first layer 31 , as generally indicated by the numeral 32 A.
- the second layer 75 (e.g., a diffuser 72 ) is a focusing (e.g., converging) layer.
- the first surface 76 includes projecting members 78 - 81 , which are like lenslets.
- the projecting members 78 - 81 are convex-shaped bead-like projecting members; however other shapes and configurations may also be appropriate.
- Each of the projecting members 78 - 81 has a spherical sector or a like-rounded projecting portion 82 and a periphery 83 , as shown in FIGS. 2 and 3.
- Each projecting member 78 - 81 can be hexagonal in shape at its periphery 83 , as shown in FIG.
- each projecting member 78 - 81 terminates at the periphery 83 , where one projecting member joins the next.
- the periphery 83 defines the projecting members 78 - 81 as being only partially spherical or partially rounded surfaces of other shapes.
- the projecting members 78 - 81 may form hemispheres.
- the spherical sector 82 is substantially equivalent to the active portion of the balls 17 - 21 in FIG. 1 (i.e., each of the spherical sectors 82 exhibits optical power). Only a portion of the balls 17 - 21 is active and the remainder is inactive, so the spherical sector 82 is analogous to just the active portion.
- the projecting members 78 - 81 are not separate beads adhered to a substrate with black adhesive, as with the prior art BMB screens. Instead, the projecting members 78 - 81 are integrally formed with a substrate 84 , beginning at the first surface 76 and terminating at the second surface 77 thereof. The substrate 84 is also integral or continuous with the projecting members 78 - 81 .
- a mask 86 can form a third or mask layer or coating (e.g., a thin coating) on the second surface 77 of the diffuser 72 , adjacent the substrate, as shown in FIG. 2.
- the mask 86 includes openings 87 - 91 .
- the openings 87 - 91 allow the image light 35 , focused as light 92 , to pass through the mask 86 at the focal point of each projecting member 78 - 81 .
- the light rays are shown in FIG. 2 passing through opening 87 , although the light 92 could have been drawn to pass through any one of the other openings 88 - 91 if the incident light 32 passed through any one of the projecting members 79 - 81 corresponding to the openings 88 - 90 .
- the light 92 can then be viewed by the viewer 27 after it is diffused by the diffuser 72 .
- the openings 87 - 91 can be laser ablated openings.
- the projecting members 78 - 81 are very small, preferably spaced between about 5 and 100 microns apart, this spacing being designated by numeral 93 in FIG. 2.
- the openings 87 - 91 have the same spacing as the projecting members 78 - 81 .
- the spacing of the openings 87 - 91 as well as the thickness of the mask 86 can be of appropriate or sufficient sizes, depending on the specific application, as determined by, but not limited to, the visual quality and contrast of images observed on the screen apparatus 30 by the viewer, how close or far the viewer needs to be from the screen apparatus 30 to resolve small image features, and the like.
- the ratio of the thickness of the mask 86 to the size of the openings 87 - 91 should be appropriate and sufficient to allow passage of image light through the openings 87 - 91 while absorbing or substantially absorbing light not desired for imaging in the regions of the mask 86 between the openings 87 - 91 , as will be appreciated by those skilled in the art having the benefit of the present disclosure.
- a method of constructing the screen apparatus 30 shown in FIG. 2 includes forming a matrix of the projecting members 78 - 81 on the first surface 76 of the substrate 84 and integral with the substrate 84 . Formation of the projecting members 78 - 81 will be discussed further below.
- the mask 86 is formed opposite the matrix of the projecting members 78 - 81 , preferably on the second surface 77 of the substrate 84 .
- the mask 86 may be a black layer of material that does not allow light to pass through because of absorption.
- carbon or another black or light absorbing material impregnated in glue or cement could be used for the mask 86 , deposited on the second surface 77 of the substrate 84 by co-extrusion, lamination, deposition, or other layering processes.
- the mask could also be a photosensitive material, and the like, such as photoresist impregnated with carbon or other black or light absorbing material.
- the mask 86 could be a photographic film that can be selectively exposed to light to form blackened light absorbing regions and light transmitting regions.
- the openings 87 - 91 are then formed through the mask 86 at selected positions, so that the light 92 can substantially only pass through the diffuser 72 at the openings 87 - 91 .
- the first and second layers 31 , 75 are positioned (e.g., rigidly or semirigidly) generally parallel to one another to receive the incoming image light 32 .
- the portions of the mask 86 exclusive of the openings 87 - 91 will substantially prevent the transmission of light through the diffuser 72 in all but the selected locations that correspond to the openings 87 - 91 .
- the openings 87 - 91 of the mask 86 are preferably formed with a laser, for example, by laser ablation using an excimer laser. This may be accomplished by directing the laser radiation along approximately the exact same path, relative to the screen apparatus 30 , that the output image light from engine 14 will pass during viewing by the viewer 27 , as will be appreciated by those skilled in the art having the benefit of the present disclosure.
- the laser radiation is directed through the first layer of material 31 and each projecting member 78 - 81 (e.g., the member 78 ) focuses the laser light at a focal point 55 on the mask 86 .
- each opening e.g., the opening 87
- the laser simply takes the place of the projection engine 14 in FIG. 2 until all the desired openings are burned or ablated through the mask 86 .
- the openings are effectively self-aligned because of the laser output being positioned where the image engine 14 will be later located for imaging through the screen apparatus 30 .
- Micro-replication can be performed after a master is constructed.
- the master is constructed by making a surface relief tool that looks similar to a complement of the screen apparatus embodiment shown in FIG. 3.
- the tool can be manufactured by a technique such as computer aided design (CAD) or an optical raytracing program and then the design could be precision milled and/or ground according to the program to render the tool in a material (e.g., a metal material) that forms a press or planar mold.
- CAD computer aided design
- a plastic material such as thermal plastic could be used to form the surface relief tool, which would be hardened to retain its shape.
- the material could be a photo-polymer that is polymerizable with ultraviolet light.
- An aluminum layer (or the like) could then be deposited on its surface and then nickel (or the like) electroplated on the aluminum to form the master.
- the master tool constructed with thermal plastic or photo-polymer, or the like is generally shown in cross-section in FIG. 4A to include a substrate portion 96 , an aluminum layer 96 B, and a nickel layer 96 C.
- Either of the tools described above could be made to wrap around a cylinder or roller.
- the device would emboss or mold the projecting surfaces on a transparent heated or heatable thermal plastic material or other material used for the substrate 84 .
- the roller would be turned or the mold pressed while embossing or molding the projecting members 78 - 81 into the thermal plastic material fed to the roller or presented to the press mold.
- FIG. 4B shows a roller 97 configured with the tool 96 wrapped around it, a feeder or hopper 98 for feeding the thermal plastic material 99 , which is dropped onto a conveyer belt 99 A.
- the material 99 could be heated in the hopper 98 and/or heated with an appropriate heating means on the belt 99 A, as will be appreciated by those skilled in the art having the benefit of the present disclosure.
- Complements 96 D of the projecting members 78 - 81 could emboss the material 99 to form the projecting members 78 - 81 as the rollar 97 turns, as generally shown in FIG. 4B.
- the thermal plastic that forms the projecting member 78 - 81 could then be hardened, for example, by photo-polymerization.
- the projecting members 78 - 81 would be integral or continuous with the substrate 84 .
- the master would not be wrapped around a roller. Instead, the planar mold would be heated and used to emboss or mold the projecting members 78 - 81 in the thermal plastic used for the substrate 84 . This compression mold would be brought to bear on the heated thermal plastic of the substrate 84 .
- the thickness of the embossed projecting members 78 - 81 and the substrate 84 would be determined by the gap or nip between the master and whatever surface is opposed to the roller or planar mold (e.g., the conveyer belt 99 A) with the material for the substrate 84 fed therebetween.
- an extrusion process could be used to form the projecting members 78 - 81 on the substrate 84 . All of these processes would allow for the projecting members 78 - 81 to be asymmetrical, if so desired, rather than symmetrical like the embodiment shown in FIG. 3.
- FIG. 4C Another method for constructing a master, generally shown in FIG. 4C, uses an inkjet nozzle 99 B of an inkjet apparatus 99 C to form microdroplets of a hot liquid 99 D (such as a solder, polymer, photoresist material, and the like) that land on a target substrate 99 E.
- a hot liquid 99 D such as a solder, polymer, photoresist material, and the like
- the droplets 99 D would be controllably formed with different meniscus profiles as the droplets 99 D are scanned across the target substrate 99 E.
- Spherical, approximately spherical, or other shaped surfaces could be produced as the material lands on the target substrate 99 E, which could be a metal, plastic, such as thermal plastic, and the like.
- Aluminum can be deposited on the droplets 99 D that have landed (e.g., if the drops 99 D are plastic or photoresist materials), followed by nickel electroplating to form a harder material layer, as described above.
- the resulting mold can be wrapped around a cylinder or a roller or can be used to form a planar mold that would be used to make a second “positive” master.
- the negative master would be used to construct the positive master in plastic, or thermal plastic, which would also be coated with aluminum and nickel as described above.
- the second master would be rolled or pressed against transparent photo-polymer or thermal plastic material fed to the roller or planar mold to emboss or mold the projecting members 78 - 81 .
- the projecting members 78 - 81 would then be hardened, for example, by UV photo-polymerization, as similarly described above.
- Another method for constructing a master uses a photo-polymer base or other substrate on which photosensitive material (e.g., photoresist) is deposited.
- a laser source is used to produce an interference pattern (i.e., the laser can write the interference pattern in the photosensitive material) using known techniques.
- the intensity profile of the interference pattern is controlled to correspond to or approximately correspond to the desired profile for forming the projecting members 78 - 81 .
- the profiles could be designed to be cylindrical instead of spherical in some embodiments.
- the interference pattern could be written in the photoresist to produce two dimensional (i.e., crossed) periodic cylindrical profiles with different periods between the peaks of adjacent profiles in the two orthogonal directions.
- a certain level of control of the profile could be maintained to produce the correct final cylindrical profiles in the photoresist, for example, through the use of spatial filters, laser light masking, or other filtering techniques.
- Positive or negative photosensitive material could be used, depending on the specific configuration, as will be appreciated by those skilled in the art having the benefit of the present disclosure.
- aluminum could be deposited to coat the remaining photosensitive material and regions where the photosensitive material has been removed. This could be followed by nickel electro-plating to form the master.
- a self-registering photomask would be used to produce a pattern for exposure of the photosensitive material or a laser would be used with a lens or other spatial filter to expose the photosensitive material in a desired exposure profile in a scanning registration pattern (similar to the inkjet approach above) instead of by interference of a-laser beam.
- cylindrical lenslets could be produced in the two orthogonal directions of a two dimensional plane upon embossing or molding of material for the projecting members 78 - 81 with the master.
- These lenslets could be designed to exhibit two different magnifications in the orthogonal directions of a screen constructed with them as viewed by a viewer. The light would be controlled asymmetrically with this screen such that the viewing angle in the vertical direction is much smaller than the viewing angle in the horizontal direction in front of the screen. Therefore, light that cannot be easily seen by the viewer would not be wasted in the vertical direction and could instead be used more efficiently at least in the horizontal direction or in other ways.
- the portions of the angular spread of light from the screen going towards the ceiling and floor, which are not easily seen by the viewer, would be more angularly limited than the portions of the angular spread of the light in the horizontal plane in front of the screen, which are more easily observed by the viewer.
- the screen apparatus 100 includes spaced apart components, a holographic optical element (HOE) 102 and a diffuser 72 ′ similar to the second layer 75 or the diffuser 72 (all primed elements in FIG. 5 are similar to or analogous to their unprimed counterparts in FIG. 3 and are constructed in similarity to the descriptions given above, including the descriptions of the processes for constructing the projecting members).
- the HOE 102 forms the collimating optical element (i.e., a collimator).
- the HOE 102 may be formed by processes described in the aforementioned U.S. patent application Ser. No. 09/060,906, including recording in an appropriate optical setup using reference and object beams.
- the incoming light radiation 32 from the image engine 14 which may be diverging (or converging in other embodiments), strikes a first surface 103 of the HOE 102 and exits the second surface 104 of the HOE 102 as the substantially collimated beam radiation 35 ′ (similar to the light 35 ).
- the substantially collimated beam 35 ′ includes rays that are substantially parallel so that the beam does not converge or diverge appreciably.
- the HOE 102 and the diffuser 72 ′ e.g., a focusing layer thereof are spaced apart by an air gap 74 ′. Minimizing the size of the air gap 74 ′ may help reduce the effects of chromatic dispersion, as will be appreciated by those skilled in the art having the benefit of the present disclosure.
- the screen apparatuses 30 and 100 described above may be advantageously employed in “folded” display apparatuses 200 and 250 shown in FIGS. 6 and 7, respectively, in accordance with embodiments of the invention.
- the display apparatuses 200 and 250 may form part of a computer monitor or television display and are similar to projection systems described in prior, co-owned U.S. patent application Ser. No. 08/581,108, filed Dec. 29, 1995, by Richard M. Knox, entitled “Projecting Images” and in European Pat. app. No. 96309443.8, EP0783133A1, filed Dec. 23, 1996, by Richard M. Knox et al., entitled “Projecting Images,” published Jul. 9, 1997, which are incorporated by reference herein in their entirety.
- the folded optical paths in the display apparatuses 200 and 250 enables the size of these image projection apparatuses to be reduced compared to other types of display apparatuses.
- the “footprint” dimensions “L” and “L”′ may be made smaller by folding, which reduces the apparent projection lengths in these apparatuses.
- the display apparatus 200 includes an image engine or projector 202 , which may be similar to the image engine 14 described above.
- the image engine 202 may also be similar to image engines described in U.S. patent application Ser. No. 08/730,818, filed Oct. 17, 1996, by Richard M. Knox, entitled “Image Projection System Engine Assembly,” now U.S. Pat. No. 6,390,626, which is incorporated by reference herein in its entirety.
- the image engine outputs image light 204 in response to input signals, for example, electronic, video, or other signals received from an antenna, cable, computer, or controller.
- the image light 204 reflects off a lower mirror or reflector 206 to a higher mirror or reflector 208 .
- the light 204 is then reflected by the upper mirror or reflector 208 and is directed to an optical element 210 .
- the optical element 210 may be similar to the first layer 31 (e.g., a Fresnel lens) or the HOE 102 , depending on the design of the display apparatus 200 .
- the air gap 74 , 74 ′ is not shown in FIG. 6.
- the image light exiting the optical element 210 could, therefore, be collimated, converging, or diverging, according to the particular design, as it enters a diffusive screen or diffuser 212 , held spaced apart from the optical element 210 .
- the diffuser 212 may be similar to the diffuser 72 or the diffusers described in the aforementioned U.S. patent application Ser. No. 09/060,906.
- the diffuser 212 scatters the image light as light 214 , which the viewer 27 can see as forming an image at the diffuser 212 of the display apparatus 200 .
- the display apparatus 250 which includes an image engine or projector 252 , a signal splitter 254 , an input cable 256 , a sound system 258 , a screen apparatus 260 , and a back mirror or reflector 262 .
- the image engine 252 may be similar to image engines described above and in the aforementioned U.S. patent application Ser. No. 08/730,818, now U.S. Pat. No. 6,390,626.
- the screen apparatus 260 includes a polarizing reflector 264 , an optical element 266 , and a diffusive screen or diffuser 268 . The optical element 266 and the diffuser 268 are held together in spaced apart relation (not shown in FIG. 7).
- the polarizing reflector 264 may be held in spaced apart relation from the optical element 266 or not in spaced apart relation (i.e., substantially with no air gaps, although not shown in FIG. 7).
- An example of a material that may be used for the polarizing reflector 264 is double brightness enhancement film (DBEF), also called multilayered optical film MOF), commercially available from Minnesota Mining & Manufacturing Company, or other wide-angle polarizing reflector materials.
- DBEF double brightness enhancement film
- MOF multilayered optical film
- the optical element 266 may be similar to the first layer 31 or the HOE 102 described above.
- the diffuser 268 may be any one of the diffusers described in the aforementioned U.S. patent application Ser. No. 09/060,906 or it may be the diffuser 72 .
- the back reflector 262 includes a mirror or reflector 270 and an achromatic retarder 272 that, depending on the design, may be layered, coated, bonded (e.g., with index matching adhesive), adjacent or otherwise applied together in the order shown in FIG. 7.
- the back mirror or reflector 270 and the achromatic retarder 272 may be held together in spaced apart relation or not in spaced apart relation (i.e., substantially with no air gaps).
- Suitable achromatic retarders may be designed to accommodate a spaced apart arrangement, as will be appreciated by those skilled in the art having the benefit of the present disclosure.
- the image engine 252 receives an electronic signal through the input cable 256 and provides the signal to the signal splitter 254 .
- the signal splitter 254 divides the signal into, for example, a video signal and an audio signal, and provides these signals to the image engine 252 and the sound system 258 , respectively.
- the image engine 252 converts the video signal into projected image light 274 .
- the electronic signal received by the cable 256 may be any type of signal containing video information, such as a television signal received by an antenna or over cable lines, or a computer video signal received through a computer video cable.
- the audio signal and the sound system are optional.
- the image light 274 may be polarized in the image engine 252 in a light source thereof (not shown) or by a polarizer (not shown) that may be employed external to the image engine 252 to polarize the image light in the first polarization discussed above.
- the image light 274 output from the image engine 252 and polarized in the first polarization direction is reflected by the polarizing reflector 264 toward the back reflector 262 .
- the reflected image light 274 passes through the achromatic retarder 272 a first time, is reflected by the back mirror or reflector 270 , and passes through the achromatic retarder 272 a second time directed again toward the screen apparatus 260 .
- the achromatic retarder 272 is designed to have an optical thickness (substantially one-quarter wave), such that the double pass of the image light 274 in the first polarization will undergo an effective half-wave polarization shift or rotation of substantially 90 degrees.
- the image light 274 now directed toward the screen apparatus will substantially be in the second polarization and will substantially pass through the polarizing reflector 264 to the optical element 266 .
- the optical element 266 collimates, converges, or diverges this light, according to the design (similar or analogous converging and diverging operations are described in the aforementioned U.S. patent application, Ser. No. 09/060,906), which is subsequently scattered by the diffuser 268 as image light 276 .
- the viewer 27 can then observe an image produced by the image light 276 at the diffuser 268 of the screen apparatus 260 , in similarity to the descriptions given above.
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Abstract
Screen apparatuses are provided which include a first lens or holographic optical element layer and a second mask layer. The first layer substantially collimates image light rays to impinge on the mask layer. The mask layer provides an array or matrix of projecting members. Each of the projecting members receives and focuses the substantially collimated light rays to corresponding focal points. The mask layer includes a mask that blocks light transmission except where openings are located. The openings allow the light focused through the focal joints to substantially pass through the mask to form an image. The screen apparatuses can be advantageously employed in display apparatuses.
Description
- This application is a divisional of U.S. Application Ser. No. 10/120,785, filed Apr. 12, 2002, which is a continuation-in-part of U.S. Application Ser. No. 09/521,236, filed Apr. 5, 2000, now U.S. Pat. No. 6,483,612, which is a continuation of U.S. application Ser. No. 09/060,906, filed Apr. 15, 1998, now abandoned. The entire disclosures of the prior applications are hereby incorporated by reference.
- The present invention relates to projection systems and projection screens and more particularly to an improved screen apparatus that includes a double layered screen construction.
- Projected light may be used to display images on large surfaces, such as large computer displays or television screens. In a front projection system, an image beam is projected from an image source onto the front side of a reflection-type, angle transforming screen, which then reflects the light toward a viewer positioned in front of the screen. In a rear projection system, the image beam is projected onto the rear side of a transmission-type, angle transforming screen and transmitted toward a viewer located in front of the screen.
- Referring to FIG. 1, wide angle projection systems that include a
screen apparatus 10 are known to optimally use a conventional Fresnel lens 11 in combination with some diffusing element, such as a substrate covered with glass beads (e.g., a type of diffuser or diffusive screen) 12. The combination forms an imaging screen that produces an image. The Fresnel lens 11 and thediffuser assembly 12 are held in relatively rigid or semi-rigid spaced apart relation to assure proper operation of the combination. Such screens, known generally in the art as “black matrix bead” or “BMB” screens, are commercially available from Minnesota Mining & Manufacturing Company and others. Fresnel lenses used in devices such as overhead projectors and projection television are commercially available from, for example, Fresnel Optics, Minnesota Mining & Manufacturing Company, and others. The Fresnel lens 11 element is constructed to provide the optical properties of a much thicker lens, however, with smaller thickness and weight. Concentric steps or discontinuities 11A allow these optical and physical properties to be realized. Each of the steps has a curved profile, in cross-section, that exhibits optical power to redirectincident light 13. The cut-out sections that define the steps reduce the overall size and weight. - In FIG. 1, the Fresnel lens11 receives the
incoming light 13 from a projection image engine or image projector 14 (e.g., a liquid crystal display imager, a light source, and a projection lens that produce image light in response to input video or other signals). The break in the light path of thelight 13 shown in FIG. 1 is included to recognize that the.light 13 may be processed or filtered, for example, projected by the projection or other lens (not shown), and is generally indicated by numeral 13A. Thescreen apparatus 10 and theimage engine 14 are arranged such that a light beam exiting the Fresnel lens 11 is collimated, as shown by parallel rays oflight 15. The collimatedrays 15 pass across anair gap 16 to a matrix of glass beads 17-21 in thediffuser assembly 12. The glass beads 17-21 are mounted upon an adhesive black mask layer 22 that is on afirst surface 23 of a substrate 24 of thediffuser assembly 12. As the collimatedlight rays 15 strike any of the glass beads 17-21, therays 15 are refracted and focused to a point as shown in FIG. 1. The substrate 24 is light transparent so that aviewer 27 can see an image from thelight 25 that passes through a surface 26 (e.g., an acrylic, polystyrene, other polymer, or like surface) of thescreen apparatus 10. The exiting rays are now wide angle transformed for wide angle viewing. Thescreen apparatus 10 can be an “touch screen” television screen, having a large diagonal dimension, for example, substantially 60 inches, or a computer monitor screen. - Problems have been associated with BMB-type screens that affect their manufacturing quality control. Uniformity of bead diameter has been problematic with the BMB screens of the type having beads placed directly upon a substrate. In these screens the beads are, for example, attached to the substrate by an adhesive. Some adhesives used in BMB screens define a black matrix that can have holes. These holes may allow light to pass through at improper locations. Another problem with bead placement upon a matrix is associated with packing density. Often it is difficult to insure that the beads are densely packed enough to avoid light transmission non-uniformity or image non-uniformity. The beads themselves may also suffer from diameter variations, transparency differences, and surface glare, and may include relatively large inactive portions and therefore non-useful parts.
- The present invention is directed to avoid or substantially avoid some or all of the problems set forth above, as well as other problems.
- The above references are incorporated by reference herein where appropriate for appropriate teachings of additional or alternative details, features and/or technical background.
- An object of the invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
- In general, in one aspect, embodiments of the invention feature a screen apparatus that includes a first layer for substantially collimating light, a second continuous layer positioned proximate the first layer for receiving the substantially collimated light from the first layer and for converging the received substantially collimated light, and a third layer adjacent the second layer, having a plurality of openings for receiving and altering the converging light as image light. The second layer includes an array of bead-like members.
- Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and advantages of the invention may be realized and attained as particularly pointed out in the appended claims.
- Other objects and advantages of the invention will become apparent upon reading the following detailed description and upon reference to the drawings in which:
- FIG. 1 is a side, cross-sectional view of a prior art BMB projection screen that uses a Fresnel lens in combination with a spaced apart bead covered diffuser;
- FIG. 2 is a side, cross-sectional view of a screen apparatus in accordance with an embodiment of the invention;
- FIG. 3 is a partial perspective view of a portion of the embodiment in FIG. 2;
- FIG. 4A is a cross-sectional view of a master tool for use in constructing a screen apparatus in accordance with an embodiment of the invention;
- FIG. 4B is a perspective view of an apparatus that uses a master tool in a process for constructing a screen apparatus in accordance with an embodiment of the invention;
- FIG. 4C is a perspective view of an apparatus used in making a master tool for use in constructing a screen apparatus in accordance with an embodiment of the invention;
- FIG. 5 is a side, cross-sectional view of a screen apparatus in accordance with an embodiment of the invention; and
- FIGS. 6 and 7 are side, cross-sectional views of display apparatuses in accordance with embodiments of the invention.
- While the invention is susceptible. to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and are herein described in detail. It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
- Illustrative embodiments of the invention are described below. In the interest of clarity, not all features of an actual implementation are described in this specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that even if such a development effort were complex and time-consuming, it would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.
- The present invention provides an improved projection screen apparatus, such as for use in a rear projection television or computer monitor that eliminates or substantially reduces the problems and shortcomings of the prior art BMB-type projection screens. The present invention provides a screen apparatus that includes a micro-replicated bead-like surface on a layer of material that receives incoming light from a lens layer, such as a Fresnel lens.
- In FIG. 2, a
screen apparatus 30 is shown in accordance with an embodiment of the invention. Thescreen apparatus 30 includes planar members, afirst layer 31 and a second layer ofmaterial 75, which can be parallel to each other, and are spaced apart by anair gap 74. Thefirst layer 31 forms a collimating optical element (i.e., a collimator) or lens layer. The first layer ofmaterial 31 can be in the form of a lens, such as a Fresnel lens. Thelayer 31 provides opposedsurfaces light radiation 32 from theimage engine 14, which may be diverging (or converging in other embodiments), strikes thefirst surface 33 of thefirst layer 31 and exits thesecond surface 34 as substantially or completely collimated beam radiation. The collimatedlight 35 includes rays that are substantially parallel so that the beam does not converge or diverge appreciably. Theimage light 32 is similar to theimage light 13 in FIG. 1, with a break labeled 32A in the light path being analogous to the break 13A in FIG. 1. For example, the light 32 may be processed or projected by a projection or other lens (not shown) to thefirst layer 31, as generally indicated by the numeral 32A. - The second layer75 (e.g., a diffuser 72) is a focusing (e.g., converging) layer. The
first surface 76 includes projecting members 78-81, which are like lenslets. In the example of FIG. 2, the projecting members 78-81 are convex-shaped bead-like projecting members; however other shapes and configurations may also be appropriate. Each of the projecting members 78-81 has a spherical sector or a like-rounded projectingportion 82 and aperiphery 83, as shown in FIGS. 2 and 3. Each projecting member 78-81 can be hexagonal in shape at itsperiphery 83, as shown in FIG. 3, although other shapes besides hexagonal could be used for theperiphery 83 as will be appreciated by those skilled in the art having the benefit of the present disclosure. Moreover, each projecting member 78-81 terminates at theperiphery 83, where one projecting member joins the next. Theperiphery 83 defines the projecting members 78-81 as being only partially spherical or partially rounded surfaces of other shapes. For example, the projecting members 78-81 may form hemispheres. Thespherical sector 82 is substantially equivalent to the active portion of the balls 17-21 in FIG. 1 (i.e., each of thespherical sectors 82 exhibits optical power). Only a portion of the balls 17-21 is active and the remainder is inactive, so thespherical sector 82 is analogous to just the active portion. - The projecting members78-81 are not separate beads adhered to a substrate with black adhesive, as with the prior art BMB screens. Instead, the projecting members 78-81 are integrally formed with a
substrate 84, beginning at thefirst surface 76 and terminating at the second surface 77 thereof. Thesubstrate 84 is also integral or continuous with the projecting members 78-81. Amask 86 can form a third or mask layer or coating (e.g., a thin coating) on the second surface 77 of thediffuser 72, adjacent the substrate, as shown in FIG. 2. Themask 86 includes openings 87-91. The openings 87-91 allow theimage light 35, focused aslight 92, to pass through themask 86 at the focal point of each projecting member 78-81. The light rays are shown in FIG. 2 passing throughopening 87, although the light 92 could have been drawn to pass through any one of the other openings 88-91 if the incident light 32 passed through any one of the projecting members 79-81 corresponding to the openings 88-90. The light 92 can then be viewed by theviewer 27 after it is diffused by thediffuser 72. The openings 87-91 can be laser ablated openings. - The projecting members78-81 are very small, preferably spaced between about 5 and 100 microns apart, this spacing being designated by numeral 93 in FIG. 2. In general, the openings 87-91 have the same spacing as the projecting members 78-81. The spacing of the openings 87-91 as well as the thickness of the
mask 86, designated by numeral 94 in FIG. 2, can be of appropriate or sufficient sizes, depending on the specific application, as determined by, but not limited to, the visual quality and contrast of images observed on thescreen apparatus 30 by the viewer, how close or far the viewer needs to be from thescreen apparatus 30 to resolve small image features, and the like. The ratio of the thickness of themask 86 to the size of the openings 87-91 should be appropriate and sufficient to allow passage of image light through the openings 87-91 while absorbing or substantially absorbing light not desired for imaging in the regions of themask 86 between the openings 87-91, as will be appreciated by those skilled in the art having the benefit of the present disclosure. - In accordance with an embodiment of the invention, a method of constructing the
screen apparatus 30 shown in FIG. 2 includes forming a matrix of the projecting members 78-81 on thefirst surface 76 of thesubstrate 84 and integral with thesubstrate 84. Formation of the projecting members 78-81 will be discussed further below. Themask 86 is formed opposite the matrix of the projecting members 78-81, preferably on the second surface 77 of thesubstrate 84. Themask 86 may be a black layer of material that does not allow light to pass through because of absorption. For example, carbon or another black or light absorbing material impregnated in glue or cement could be used for themask 86, deposited on the second surface 77 of thesubstrate 84 by co-extrusion, lamination, deposition, or other layering processes. The mask could also be a photosensitive material, and the like, such as photoresist impregnated with carbon or other black or light absorbing material. Themask 86 could be a photographic film that can be selectively exposed to light to form blackened light absorbing regions and light transmitting regions. - The openings87-91 are then formed through the
mask 86 at selected positions, so that the light 92 can substantially only pass through thediffuser 72 at the openings 87-91. The first andsecond layers incoming image light 32. The portions of themask 86 exclusive of the openings 87-91 will substantially prevent the transmission of light through thediffuser 72 in all but the selected locations that correspond to the openings 87-91. - The openings87-91 of the
mask 86 are preferably formed with a laser, for example, by laser ablation using an excimer laser. This may be accomplished by directing the laser radiation along approximately the exact same path, relative to thescreen apparatus 30, that the output image light fromengine 14 will pass during viewing by theviewer 27, as will be appreciated by those skilled in the art having the benefit of the present disclosure. The laser radiation is directed through the first layer ofmaterial 31 and each projecting member 78-81 (e.g., the member 78) focuses the laser light at afocal point 55 on themask 86. Laser ablation then forms each opening (e.g., the opening 87) in themask 86 at the focal point 95 of the projectingmember 78. In effect, the laser simply takes the place of theprojection engine 14 in FIG. 2 until all the desired openings are burned or ablated through themask 86. Thus, the openings are effectively self-aligned because of the laser output being positioned where theimage engine 14 will be later located for imaging through thescreen apparatus 30. - One process for forming the projecting members78-81 at the
first surface 76 of thesubstrate 84 is micro-replication. Micro-replication can be performed after a master is constructed. The master is constructed by making a surface relief tool that looks similar to a complement of the screen apparatus embodiment shown in FIG. 3. The tool can be manufactured by a technique such as computer aided design (CAD) or an optical raytracing program and then the design could be precision milled and/or ground according to the program to render the tool in a material (e.g., a metal material) that forms a press or planar mold. Alternatively, a plastic material such as thermal plastic could be used to form the surface relief tool, which would be hardened to retain its shape. The material could be a photo-polymer that is polymerizable with ultraviolet light. An aluminum layer (or the like) could then be deposited on its surface and then nickel (or the like) electroplated on the aluminum to form the master. - The master tool constructed with thermal plastic or photo-polymer, or the like, is generally shown in cross-section in FIG. 4A to include a substrate portion96, an
aluminum layer 96B, and anickel layer 96C. Either of the tools described above could be made to wrap around a cylinder or roller. Whether a roller device or a press or planar mold device is used, the device would emboss or mold the projecting surfaces on a transparent heated or heatable thermal plastic material or other material used for thesubstrate 84. The roller would be turned or the mold pressed while embossing or molding the projecting members 78-81 into the thermal plastic material fed to the roller or presented to the press mold. FIG. 4B shows aroller 97 configured with the tool 96 wrapped around it, a feeder orhopper 98 for feeding the thermalplastic material 99, which is dropped onto aconveyer belt 99A. Thematerial 99 could be heated in thehopper 98 and/or heated with an appropriate heating means on thebelt 99A, as will be appreciated by those skilled in the art having the benefit of the present disclosure.Complements 96D of the projecting members 78-81 could emboss the material 99 to form the projecting members 78-81 as therollar 97 turns, as generally shown in FIG. 4B. The thermal plastic that forms the projecting member 78-81 could then be hardened, for example, by photo-polymerization. The projecting members 78-81 would be integral or continuous with thesubstrate 84. - For a press or planar mold, the master would not be wrapped around a roller. Instead, the planar mold would be heated and used to emboss or mold the projecting members78-81 in the thermal plastic used for the
substrate 84. This compression mold would be brought to bear on the heated thermal plastic of thesubstrate 84. With either a roller or a planar mold method, the thickness of the embossed projecting members 78-81 and thesubstrate 84 would be determined by the gap or nip between the master and whatever surface is opposed to the roller or planar mold (e.g., theconveyer belt 99A) with the material for thesubstrate 84 fed therebetween. In other embodiments, an extrusion process could be used to form the projecting members 78-81 on thesubstrate 84. All of these processes would allow for the projecting members 78-81 to be asymmetrical, if so desired, rather than symmetrical like the embodiment shown in FIG. 3. - Another method for constructing a master, generally shown in FIG. 4C, uses an inkjet nozzle99B of an inkjet apparatus 99C to form microdroplets of a
hot liquid 99D (such as a solder, polymer, photoresist material, and the like) that land on a target substrate 99E. Depending on the type of material ejected through the inkjet nozzle 99B, thedroplets 99D would be controllably formed with different meniscus profiles as thedroplets 99D are scanned across the target substrate 99E. Spherical, approximately spherical, or other shaped surfaces could be produced as the material lands on the target substrate 99E, which could be a metal, plastic, such as thermal plastic, and the like. Thedroplets 99D that land form complements of the lenslets 78-81 shapes and are used for micro-replicating (i.e., thedroplets 99D that land form a “negative”). Aluminum can be deposited on thedroplets 99D that have landed (e.g., if the drops 99D are plastic or photoresist materials), followed by nickel electroplating to form a harder material layer, as described above. The resulting mold can be wrapped around a cylinder or a roller or can be used to form a planar mold that would be used to make a second “positive” master. The negative master would be used to construct the positive master in plastic, or thermal plastic, which would also be coated with aluminum and nickel as described above. The second master would be rolled or pressed against transparent photo-polymer or thermal plastic material fed to the roller or planar mold to emboss or mold the projecting members 78-81. The projecting members 78-81 would then be hardened, for example, by UV photo-polymerization, as similarly described above. - Another method for constructing a master uses a photo-polymer base or other substrate on which photosensitive material (e.g., photoresist) is deposited. A laser source is used to produce an interference pattern (i.e., the laser can write the interference pattern in the photosensitive material) using known techniques. The intensity profile of the interference pattern is controlled to correspond to or approximately correspond to the desired profile for forming the projecting members78-81. The profiles could be designed to be cylindrical instead of spherical in some embodiments. For example, the interference pattern could be written in the photoresist to produce two dimensional (i.e., crossed) periodic cylindrical profiles with different periods between the peaks of adjacent profiles in the two orthogonal directions. A certain level of control of the profile could be maintained to produce the correct final cylindrical profiles in the photoresist, for example, through the use of spatial filters, laser light masking, or other filtering techniques. Positive or negative photosensitive material could be used, depending on the specific configuration, as will be appreciated by those skilled in the art having the benefit of the present disclosure. After exposure and development of the photosensitive material, whether a spherical or cylindrical profile is desired, aluminum could be deposited to coat the remaining photosensitive material and regions where the photosensitive material has been removed. This could be followed by nickel electro-plating to form the master. In yet other methods for producing a master, a self-registering photomask would be used to produce a pattern for exposure of the photosensitive material or a laser would be used with a lens or other spatial filter to expose the photosensitive material in a desired exposure profile in a scanning registration pattern (similar to the inkjet approach above) instead of by interference of a-laser beam.
- It will be apparent to those skilled in the art that the masters described above could be constructed to form the projecting members78-81 with techniques that use one or more positive or negative (i.e., complement) copying or rendering steps, or combinations thereof. Such positive or negative or combination steps are included within the scope of the invention.
- Regardless of the technique of producing the master, as discussed, in certain embodiments, cylindrical lenslets could be produced in the two orthogonal directions of a two dimensional plane upon embossing or molding of material for the projecting members78-81 with the master. These lenslets could be designed to exhibit two different magnifications in the orthogonal directions of a screen constructed with them as viewed by a viewer. The light would be controlled asymmetrically with this screen such that the viewing angle in the vertical direction is much smaller than the viewing angle in the horizontal direction in front of the screen. Therefore, light that cannot be easily seen by the viewer would not be wasted in the vertical direction and could instead be used more efficiently at least in the horizontal direction or in other ways. For example, the portions of the angular spread of light from the screen going towards the ceiling and floor, which are not easily seen by the viewer, would be more angularly limited than the portions of the angular spread of the light in the horizontal plane in front of the screen, which are more easily observed by the viewer.
- Referring now to FIG. 5, a
screen apparatus 100 is shown in accordance with another embodiment of the invention. Thescreen apparatus 100 includes spaced apart components, a holographic optical element (HOE) 102 and adiffuser 72′ similar to thesecond layer 75 or the diffuser 72 (all primed elements in FIG. 5 are similar to or analogous to their unprimed counterparts in FIG. 3 and are constructed in similarity to the descriptions given above, including the descriptions of the processes for constructing the projecting members). TheHOE 102 forms the collimating optical element (i.e., a collimator). TheHOE 102 may be formed by processes described in the aforementioned U.S. patent application Ser. No. 09/060,906, including recording in an appropriate optical setup using reference and object beams. - The incoming
light radiation 32 from theimage engine 14, which may be diverging (or converging in other embodiments), strikes afirst surface 103 of theHOE 102 and exits thesecond surface 104 of theHOE 102 as the substantially collimatedbeam radiation 35′ (similar to the light 35). The substantially collimatedbeam 35′ includes rays that are substantially parallel so that the beam does not converge or diverge appreciably. TheHOE 102 and thediffuser 72′ (e.g., a focusing layer thereof are spaced apart by anair gap 74′. Minimizing the size of theair gap 74′ may help reduce the effects of chromatic dispersion, as will be appreciated by those skilled in the art having the benefit of the present disclosure. - The screen apparatuses30 and 100 described above may be advantageously employed in “folded”
display apparatuses display apparatuses - Referring to FIG. 6, the
display apparatus 200 includes an image engine orprojector 202, which may be similar to theimage engine 14 described above. Theimage engine 202 may also be similar to image engines described in U.S. patent application Ser. No. 08/730,818, filed Oct. 17, 1996, by Richard M. Knox, entitled “Image Projection System Engine Assembly,” now U.S. Pat. No. 6,390,626, which is incorporated by reference herein in its entirety. The image engine outputs image light 204 in response to input signals, for example, electronic, video, or other signals received from an antenna, cable, computer, or controller. Theimage light 204 reflects off a lower mirror orreflector 206 to a higher mirror orreflector 208. The light 204 is then reflected by the upper mirror orreflector 208 and is directed to anoptical element 210. Theoptical element 210 may be similar to the first layer 31 (e.g., a Fresnel lens) or theHOE 102, depending on the design of thedisplay apparatus 200. Theair gap optical element 210 could, therefore, be collimated, converging, or diverging, according to the particular design, as it enters a diffusive screen ordiffuser 212, held spaced apart from theoptical element 210. Thediffuser 212 may be similar to thediffuser 72 or the diffusers described in the aforementioned U.S. patent application Ser. No. 09/060,906. Thediffuser 212 scatters the image light aslight 214, which theviewer 27 can see as forming an image at thediffuser 212 of thedisplay apparatus 200. - Referring to FIG. 7, the
display apparatus 250 is shown, which includes an image engine orprojector 252, asignal splitter 254, aninput cable 256, asound system 258, ascreen apparatus 260, and a back mirror orreflector 262. Theimage engine 252 may be similar to image engines described above and in the aforementioned U.S. patent application Ser. No. 08/730,818, now U.S. Pat. No. 6,390,626. Thescreen apparatus 260 includes a polarizing reflector 264, anoptical element 266, and a diffusive screen ordiffuser 268. Theoptical element 266 and thediffuser 268 are held together in spaced apart relation (not shown in FIG. 7). The polarizing reflector 264 may be held in spaced apart relation from theoptical element 266 or not in spaced apart relation (i.e., substantially with no air gaps, although not shown in FIG. 7). An example of a material that may be used for the polarizing reflector 264 is double brightness enhancement film (DBEF), also called multilayered optical film MOF), commercially available from Minnesota Mining & Manufacturing Company, or other wide-angle polarizing reflector materials. The polarizing reflector 264 has a characteristic of preferentially reflecting light of a first linear polarization and preferentially transmitting light of a second linear polarization, orthogonal to the first polarization light. Depending on the design of thedisplay apparatus 250, theoptical element 266 may be similar to thefirst layer 31 or theHOE 102 described above. Likewise, depending on the design, thediffuser 268 may be any one of the diffusers described in the aforementioned U.S. patent application Ser. No. 09/060,906 or it may be thediffuser 72. - The
back reflector 262 includes a mirror or reflector 270 and anachromatic retarder 272 that, depending on the design, may be layered, coated, bonded (e.g., with index matching adhesive), adjacent or otherwise applied together in the order shown in FIG. 7. The back mirror or reflector 270 and theachromatic retarder 272 may be held together in spaced apart relation or not in spaced apart relation (i.e., substantially with no air gaps). Suitable achromatic retarders may be designed to accommodate a spaced apart arrangement, as will be appreciated by those skilled in the art having the benefit of the present disclosure. - In operating the
display apparatus 250, theimage engine 252 receives an electronic signal through theinput cable 256 and provides the signal to thesignal splitter 254. Thesignal splitter 254 divides the signal into, for example, a video signal and an audio signal, and provides these signals to theimage engine 252 and thesound system 258, respectively. Theimage engine 252 converts the video signal into projectedimage light 274. The electronic signal received by thecable 256 may be any type of signal containing video information, such as a television signal received by an antenna or over cable lines, or a computer video signal received through a computer video cable. The audio signal and the sound system are optional. - The
image light 274 may be polarized in theimage engine 252 in a light source thereof (not shown) or by a polarizer (not shown) that may be employed external to theimage engine 252 to polarize the image light in the first polarization discussed above. In a first instance, theimage light 274 output from theimage engine 252 and polarized in the first polarization direction is reflected by the polarizing reflector 264 toward theback reflector 262. The reflected image light 274 passes through the achromatic retarder 272 a first time, is reflected by the back mirror or reflector 270, and passes through the achromatic retarder 272 a second time directed again toward thescreen apparatus 260. Theachromatic retarder 272 is designed to have an optical thickness (substantially one-quarter wave), such that the double pass of theimage light 274 in the first polarization will undergo an effective half-wave polarization shift or rotation of substantially 90 degrees. Thus, theimage light 274 now directed toward the screen apparatus will substantially be in the second polarization and will substantially pass through the polarizing reflector 264 to theoptical element 266. Theoptical element 266 collimates, converges, or diverges this light, according to the design (similar or analogous converging and diverging operations are described in the aforementioned U.S. patent application, Ser. No. 09/060,906), which is subsequently scattered by thediffuser 268 asimage light 276. Theviewer 27 can then observe an image produced by theimage light 276 at thediffuser 268 of thescreen apparatus 260, in similarity to the descriptions given above. - The particular embodiments disclosed above are illustrative only, as the invention may be modified and practiced in different but equivalent manners apparent to those skilled in the art having the benefit of the teachings herein. Furthermore, no limitations are intended to the details of construction or design herein shown, other than as described in the claims below. It is therefore evident that the particular embodiments disclosed above may be altered or modified and all such variations are considered within the scope and spirit of the invention. Accordingly, the protection sought herein is as set forth in the claims below
Claims (12)
1. A method of forming localized positive optical power units in a substrate, comprising:
forming a master in the form of a complement to a desired arrangement of localized positive optical power units on a substrate; and
molding a plurality of localized positive optical power units onto a substrate using the master.
2. The method of claim 1 , wherein the master is designed using one of computer aided design or an optical ray tracing program.
3. The method of claim 2 , wherein the master is manufactured using precision milling or is ground to form a press or planar mold.
4. The method of claim 1 , wherein the master is formed of a thermal plastic material which is hardened to retain its shape.
5. The method of claim 4 , wherein the master is formed of photo-polymer that is polymerized with ultraviolet light.
6. The method of claim 1 , wherein the master comprises a substrate having a first layer comprising aluminum deposited thereon and a second layer comprising nickel deposited on the first layer.
7. The method of claim 1 , wherein the master is configured to wrap around a cylinder or roller, which is then used to mold a plurality of bead-like projecting members onto a substrate.
8. The method of claim 1 , wherein the step of molding a plurality of localized positive optical power units onto a substrate using the master comprises heating the master and then embossing a plurality of localized positive optical power units onto a substrate using the heated master.
9. The method of claim 1 , wherein the step of forming a master in the form of a complement to a desired arrangement of localized positive optical power units on a substrate comprises providing a base substrate; and projecting microdroplets of a hot liquid ink onto the base substrate, thereby forming a complement of a desired arrangement of localized positive optical power units on the base substrate.
10. The method of claim 9 , wherein the localized positive optical power units comprise projecting members.
11. The method of claim 10 , wherein the projecting members are spherical, or approximately spherical.
12. The method of claim 9 , wherein the substrate is metal, or plastic.
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US10/824,672 US20040188875A1 (en) | 1998-04-15 | 2004-04-14 | Methods of forming localized positive optical power units a substrate |
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US6090698A | 1998-04-15 | 1998-04-15 | |
US09/521,236 US6483612B2 (en) | 1998-04-15 | 2000-04-05 | Projection screen apparatus including holographic optical element |
US10/120,785 US6788460B2 (en) | 1998-04-15 | 2002-04-12 | Projection screen apparatus |
US10/824,672 US20040188875A1 (en) | 1998-04-15 | 2004-04-14 | Methods of forming localized positive optical power units a substrate |
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Cited By (5)
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US20070035154A1 (en) * | 2005-01-31 | 2007-02-15 | Edscha Cabrio-Dachsysteme Gmbh | Top for a convertible vehicle |
US20080211991A1 (en) * | 2007-02-09 | 2008-09-04 | Bright View Technologies, Inc. | High contrast liquid crystal displays |
WO2014165863A2 (en) * | 2013-04-05 | 2014-10-09 | Keane Sean Frederick | A system for capturing transmitting, and displaying volumetric data |
EP2417489B1 (en) | 2009-04-06 | 2017-03-08 | Reserve Bank of Australia | Method of manufacturing a security document or device with an optically variable image |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
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US6970289B1 (en) * | 2000-08-23 | 2005-11-29 | Corning Incorporated | Screen for rear projection display |
DE10160947A1 (en) * | 2001-12-12 | 2003-07-17 | Stn Atlas Elektronik Gmbh | Projection screen for image projection |
US6896375B2 (en) | 2002-08-16 | 2005-05-24 | Infocus Corporation | Rear projection display device having multiple mirrors that are substantially parallel to a screen |
US7175287B2 (en) * | 2002-08-16 | 2007-02-13 | Infocus Corporation | Wide angle projection lens |
US7102820B2 (en) | 2002-08-16 | 2006-09-05 | Infocus Corporation | Flat valley fresnel lens for a display device |
US7341353B2 (en) * | 2002-08-16 | 2008-03-11 | Infocus Corporation | Variable fresnel screen for use in projection device |
US7009765B2 (en) * | 2002-08-16 | 2006-03-07 | Infocus Corporation | Wide angle lens system having a distorted intermediate image |
US7150537B2 (en) * | 2002-08-16 | 2006-12-19 | Infocus Corporation | Projection television device and screen |
JP2004145252A (en) * | 2002-08-30 | 2004-05-20 | Seiko Epson Corp | Transmission type screen and rear type projector |
JP4386249B2 (en) * | 2003-07-01 | 2009-12-16 | 三菱電機株式会社 | Diffusion structure plate for rear projection screen and rear projection screen |
US7080910B2 (en) * | 2003-08-19 | 2006-07-25 | Infocus Corporation | Method and system for a thermal architecture and user adjustable keystone in a display device |
US7259912B2 (en) | 2004-01-06 | 2007-08-21 | Infocus Corporation | Fresnel lens having reduced distortions |
US20050151285A1 (en) * | 2004-01-12 | 2005-07-14 | Grot Annette C. | Method for manufacturing micromechanical structures |
US7808706B2 (en) | 2004-02-12 | 2010-10-05 | Tredegar Newco, Inc. | Light management films for displays |
US7262912B2 (en) * | 2004-02-12 | 2007-08-28 | Bright View Technologies, Inc. | Front-projection screens including reflecting layers and optically absorbing layers having apertures therein, and methods of fabricating the same |
GB2417790B (en) * | 2004-09-07 | 2006-11-08 | Set Europ Ltd | Lighting system |
US7667893B2 (en) * | 2005-04-06 | 2010-02-23 | Seiko Epson Corporation | Microlens front projection screen |
JP4225291B2 (en) * | 2005-05-10 | 2009-02-18 | セイコーエプソン株式会社 | Microlens, optical plate, diffuser plate, light guide plate, backlight, projection screen, projection system, electro-optical device and electronic apparatus, and microlens manufacturing method |
KR20060133484A (en) * | 2005-06-20 | 2006-12-26 | 히다치 막셀 가부시키가이샤 | Illuminating system, display, optical sheet and the production method therefor |
US7420742B2 (en) | 2005-12-07 | 2008-09-02 | Bright View Technologies, Inc. | Optically transparent electromagnetic interference (EMI) shields for direct-view displays |
US7502169B2 (en) * | 2005-12-07 | 2009-03-10 | Bright View Technologies, Inc. | Contrast enhancement films for direct-view displays and fabrication methods therefor |
US20070253058A1 (en) * | 2006-05-01 | 2007-11-01 | Bright View Technologies, Inc. | Brightness enhancement structures including optical microstructures to provide elliptical diffusion patterns and methods of fabricating and operating the same |
US7394594B2 (en) * | 2006-05-08 | 2008-07-01 | Bright View Technologies, Inc. | Methods for processing a pulsed laser beam to create apertures through microlens arrays |
US20080084611A1 (en) * | 2006-10-05 | 2008-04-10 | Bright View Technologies, Inc. | Methods and Apparatus for Creating Apertures Through Microlens Arrays Using Curved Cradles, and Products Produced Thereby |
US7570423B2 (en) * | 2007-01-25 | 2009-08-04 | Hewlett-Packard Development Company, L.P. | Projection screen |
KR20100075606A (en) * | 2007-10-12 | 2010-07-02 | 브라이트 뷰 테크놀로지즈, 아이엔씨. | Light management films, back light units, and related structures |
US8162512B2 (en) * | 2009-09-10 | 2012-04-24 | Entire Technology Co., Ltd. | Optical sheet, manufacturing method thereof, and backlight assembly using the same |
KR101816580B1 (en) * | 2011-04-29 | 2018-01-09 | 엘지전자 주식회사 | Display screen for image display system and method for manufacturing the same |
US8884815B2 (en) * | 2011-07-22 | 2014-11-11 | Ratheon Company | Antenna-coupled imager having pixels with integrated lenslets |
TWI597558B (en) * | 2015-09-18 | 2017-09-01 | 中強光電股份有限公司 | Projection screen |
FR3084207B1 (en) * | 2018-07-19 | 2021-02-19 | Isorg | OPTICAL SYSTEM AND ITS MANUFACTURING PROCESS |
JP2022141058A (en) * | 2021-03-15 | 2022-09-29 | オムロン株式会社 | Display switching device |
Citations (72)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1942841A (en) * | 1931-01-19 | 1934-01-09 | Shimizu Takeo | Daylight screen |
US3893748A (en) * | 1973-11-30 | 1975-07-08 | Eastman Kodak Co | Low scintillation, multi-component projection screen |
US4076384A (en) * | 1975-05-02 | 1978-02-28 | Agfa-Gevaert, A.G. | Rear-projection viewing screen |
US4083626A (en) * | 1975-04-04 | 1978-04-11 | Fuji Photo Film Co., Ltd. | Rear projection screens |
US4172219A (en) * | 1975-03-15 | 1979-10-23 | Agfa-Gevaert, A.G. | Daylight projection screen and method and apparatus for making the same |
US4268118A (en) * | 1979-09-05 | 1981-05-19 | Minnesota Mining And Manufacturing Company | Sheeting useful as a projection screen |
US4418986A (en) * | 1981-04-07 | 1983-12-06 | Mitsubishi Rayon Co., Ltd. | Rear projection screen |
US4490010A (en) * | 1982-06-10 | 1984-12-25 | Dai Nippon Insatsu Kabushiki Kaisha | Rear projection screen |
US4523849A (en) * | 1982-02-11 | 1985-06-18 | The United States Of America As Represented By The United States Department Of Energy | Front lighted optical tooling method and apparatus |
US4666248A (en) * | 1985-12-20 | 1987-05-19 | U. S. Philips Corporation | Rear-projection screen |
US4773731A (en) * | 1987-08-28 | 1988-09-27 | North American Philips Corp. | One-piece projection screen |
US4799137A (en) * | 1987-03-24 | 1989-01-17 | Minnesota Mining And Manufacturing Company | Reflective film |
US4874228A (en) * | 1987-03-24 | 1989-10-17 | Minnesota Mining And Manufacturing Company | Back-lit display |
US4961642A (en) * | 1988-07-18 | 1990-10-09 | Hitachi, Ltd. | Projection type display device for monitoring at short distance |
US4969732A (en) * | 1988-02-25 | 1990-11-13 | Thorn Emi Plc | Display device |
US4982214A (en) * | 1988-05-07 | 1991-01-01 | Canon Kabushiki Kaisha | Focusing screen |
US5054885A (en) * | 1988-10-11 | 1991-10-08 | Minnesota Mining And Manfuacturing Company | Light fixture including a partially collimated beam of light and reflective prisms having peaks lying on a curved surface |
US5122906A (en) * | 1989-06-20 | 1992-06-16 | The Dow Chemical Company | Thick/very thin multilayer reflective polymeric body |
US5166824A (en) * | 1990-10-30 | 1992-11-24 | Hitachi, Ltd. | Rear projection screen and manufacturing method therefor as well as molding die for shaping rear projection screen, overhead projector and projection television set |
US5190370A (en) * | 1991-08-21 | 1993-03-02 | Minnesota Mining And Manufacturing Company | High aspect ratio lighting element |
US5193015A (en) * | 1989-10-05 | 1993-03-09 | Thorn Emi Plc | Cholesteric liquid crystal screen which reflects substantially all of the projected light |
US5223869A (en) * | 1990-02-20 | 1993-06-29 | Canon Kabushiki Kaisha | Projector |
US5333072A (en) * | 1992-12-31 | 1994-07-26 | Minnesota Mining And Manufacturing Company | Reflective liquid crystal display overhead projection system using a reflective linear polarizer and a fresnel lens |
US5337106A (en) * | 1993-06-09 | 1994-08-09 | Kowa Company, Ltd. | Liquid-crystal image director for single-lens-reflex camera |
US5337179A (en) * | 1992-07-27 | 1994-08-09 | Hodges Marvin P | Flexible controllable optical surface and method of making the same |
US5381309A (en) * | 1993-09-30 | 1995-01-10 | Honeywell Inc. | Backlit display with enhanced viewing properties |
US5404076A (en) * | 1990-10-25 | 1995-04-04 | Fusion Systems Corporation | Lamp including sulfur |
US5442482A (en) * | 1990-05-21 | 1995-08-15 | Johnson; William N. H. | Microlens screens, photopolymerisable materials and artifacts utilising the same |
US5453859A (en) * | 1993-06-03 | 1995-09-26 | Matsushita Electric Industrial Co., Ltd. | Polarization beam splitter and projection display apparatus |
US5467154A (en) * | 1992-02-20 | 1995-11-14 | Kopin Corporation | Projection monitor |
US5486949A (en) * | 1989-06-20 | 1996-01-23 | The Dow Chemical Company | Birefringent interference polarizer |
US5496668A (en) * | 1992-12-22 | 1996-03-05 | Wisconsin Alumni Research Foundation | Formation of microstructures using a preformed photoresist sheet |
US5504391A (en) * | 1992-01-29 | 1996-04-02 | Fusion Systems Corporation | Excimer lamp with high pressure fill |
US5512219A (en) * | 1994-06-03 | 1996-04-30 | Reflexite Corporation | Method of casting a microstructure sheet having an array of prism elements using a reusable polycarbonate mold |
US5557343A (en) * | 1994-01-28 | 1996-09-17 | Matsushita Electric Industrial, Co., Ltd. | Optical system including a reflecting polarizer for a rear projection picture display apparatus |
US5563738A (en) * | 1993-09-03 | 1996-10-08 | Jenmar Visual Systems | Light transmitting and dispersing filter having low reflectance |
US5573324A (en) * | 1993-12-10 | 1996-11-12 | U.S. Philips Corporation | Image projection system |
US5615045A (en) * | 1992-12-25 | 1997-03-25 | Sony Corporation | Screen of projection display |
US5626800A (en) * | 1995-02-03 | 1997-05-06 | Minnesota Mining And Manufacturing Company | Prevention of groove tip deformation in brightness enhancement film |
US5642226A (en) * | 1995-01-18 | 1997-06-24 | Rosenthal; Bruce A. | Lenticular optical system |
US5644431A (en) * | 1990-05-18 | 1997-07-01 | University Of Arkansas, N.A. | Directional image transmission sheet and method of making same |
US5657408A (en) * | 1994-12-23 | 1997-08-12 | Alliedsignal Inc. | Optical device comprising a plurality of units having at least two geometrically-differentiated tapered optical waveguides therein |
US5661531A (en) * | 1996-01-29 | 1997-08-26 | Rainbow Displays Inc. | Tiled, flat-panel display having invisible seams |
US5670842A (en) * | 1990-10-25 | 1997-09-23 | Fusion Lighting Inc | Method and apparatus for igniting electroeless lamp discharge |
US5692820A (en) * | 1992-02-20 | 1997-12-02 | Kopin Corporation | Projection monitor |
US5694246A (en) * | 1994-01-03 | 1997-12-02 | Omron Corporation | Method of manufacturing lens array |
US5695895A (en) * | 1993-06-15 | 1997-12-09 | Nashua Corporation | Randomised mask for a diffusing screen |
US5796499A (en) * | 1997-02-28 | 1998-08-18 | Polaroid Corporation | Transmission holographic diffuser made and used to effect lateral color constancy in rear screen projection display systems |
US5801794A (en) * | 1994-07-08 | 1998-09-01 | Thomson-Csf | Color display device in which the area of a spherical lens equals the area of a set of RGB sub-pixels |
US5870224A (en) * | 1995-10-25 | 1999-02-09 | Toppan Printing Company Limited | Lenticular sheet, rear-projection screen or TV using the same, and fabrication method for said lenticular sheet |
US5877893A (en) * | 1996-03-30 | 1999-03-02 | Samsung Electronics Co., Ltd. | Holographic screen having light absorbers for absorbing ambient light |
US5877874A (en) * | 1995-08-24 | 1999-03-02 | Terrasun L.L.C. | Device for concentrating optical radiation |
US5933276A (en) * | 1994-04-13 | 1999-08-03 | Board Of Trustees, University Of Arkansas, N.A. | Aberration-free directional image window sheet |
US5932342A (en) * | 1996-11-14 | 1999-08-03 | Nashua Corporation | Optical diffusers obtained by fluid phase mixing of incompatible materials |
US6128054A (en) * | 1996-09-06 | 2000-10-03 | Central Research Laboratories Limited | Apparatus for displaying an image |
US6185038B1 (en) * | 1997-09-26 | 2001-02-06 | Matsushita Electric Industrial Co., Ltd. | Rear projection screen with light diffusion sheet and projector using same |
US6278546B1 (en) * | 1999-04-01 | 2001-08-21 | Honeywell International Inc. | Display screen and method of manufacture therefor |
US6301051B1 (en) * | 2000-04-05 | 2001-10-09 | Rockwell Technologies, Llc | High fill-factor microlens array and fabrication method |
US6317263B1 (en) * | 1999-06-18 | 2001-11-13 | 3M Innovative Properties Company | Projection screen using dispersing lens array for asymmetric viewing angle |
US6335828B1 (en) * | 1998-10-26 | 2002-01-01 | Kabushiki Kaisha Toshiba | Micro-lens array sheet |
US6353500B1 (en) * | 1996-11-07 | 2002-03-05 | Franck Guigan | Static screen for animated images |
US20020034710A1 (en) * | 2000-07-31 | 2002-03-21 | Rochester Photonics Corporation | Structured screens for controlled spreading of light |
US20020034014A1 (en) * | 2000-07-31 | 2002-03-21 | Gretton Geoffrey B. | Microlens arrays having high focusing efficiency |
US6410213B1 (en) * | 1998-06-09 | 2002-06-25 | Corning Incorporated | Method for making optical microstructures having profile heights exceeding fifteen microns |
US20020145797A1 (en) * | 2001-02-07 | 2002-10-10 | Sales Tasso R.M. | High-contrast screen with random microlens array |
US6469820B1 (en) * | 1996-02-28 | 2002-10-22 | Minolta Co., Ltd. | Scanning optical system |
US6503384B1 (en) * | 1999-04-01 | 2003-01-07 | Canon Kabushiki Kaisha | Microstructure array, and methods of fabricating a microstructure array, a mold for forming a microstructure array, and a microlens array |
US6552848B2 (en) * | 2000-09-14 | 2003-04-22 | Kuraray Co., Ltd. | Rear projection type screen and method of manufacturing same |
US6590605B1 (en) * | 1998-10-14 | 2003-07-08 | Dimension Technologies, Inc. | Autostereoscopic display |
US6594079B1 (en) * | 1999-08-04 | 2003-07-15 | Agilent Technologies, Inc. | Image screen and method of forming anti-reflective layer thereon |
US6597502B2 (en) * | 1998-02-23 | 2003-07-22 | Dai Nippon Printing Co., Ltd. | Rear projection screen with uniformity of luminance |
US20040004770A1 (en) * | 2001-06-01 | 2004-01-08 | Kazuyoshi Ebina | Micro-lens sheet and projection screen |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03243932A (en) | 1990-02-22 | 1991-10-30 | Canon Inc | Rear projection type image receiver |
JP2884458B2 (en) * | 1992-05-11 | 1999-04-19 | キヤノン株式会社 | Liquid crystal display panel manufacturing method |
WO1995034832A1 (en) | 1992-12-15 | 1995-12-21 | Thomson-Csf | Holographic projection screen and method for its production |
US6181386B1 (en) | 1995-12-29 | 2001-01-30 | Duke University | Projecting images |
US5866990A (en) | 1996-01-26 | 1999-02-02 | Fusion Lighting, Inc. | Microwave lamp with multi-purpose rotary motor |
US5688064A (en) | 1996-10-30 | 1997-11-18 | Fusion Lighting, Inc. | Method and apparatus for coupling bulb stem to rotatable motor shaft |
JPH1039769A (en) | 1996-07-19 | 1998-02-13 | Toray Ind Inc | Micro lens array sheet |
JPH10123623A (en) | 1996-10-16 | 1998-05-15 | Casio Comput Co Ltd | Transmission type projection screen |
JPH10239503A (en) | 1997-02-26 | 1998-09-11 | Sharp Corp | Micro lens array, and manufacture thereof |
JPH11101902A (en) | 1997-09-25 | 1999-04-13 | Goyo Paper Working Co Ltd | Manufacture of microlens sheet having light-shieldable matrix |
US6469830B1 (en) * | 1999-04-01 | 2002-10-22 | Honeywell Inc. | Display screen and method of manufacture therefor |
JP2001116917A (en) * | 1999-10-18 | 2001-04-27 | Hitachi Ltd | Member to improve image quality and image display device using the same |
AU2003220950A1 (en) | 2003-03-28 | 2004-10-25 | Fujitsu Limited | Imager and personal idenfification system |
CA2586553C (en) | 2004-11-24 | 2015-02-10 | Alcon, Inc. | Nasal sprayer containing a formulation with olopatadine |
-
2002
- 2002-04-12 US US10/120,785 patent/US6788460B2/en not_active Expired - Fee Related
-
2004
- 2004-04-14 US US10/824,672 patent/US20040188875A1/en not_active Abandoned
Patent Citations (78)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1942841A (en) * | 1931-01-19 | 1934-01-09 | Shimizu Takeo | Daylight screen |
US3893748A (en) * | 1973-11-30 | 1975-07-08 | Eastman Kodak Co | Low scintillation, multi-component projection screen |
US4172219A (en) * | 1975-03-15 | 1979-10-23 | Agfa-Gevaert, A.G. | Daylight projection screen and method and apparatus for making the same |
US4083626A (en) * | 1975-04-04 | 1978-04-11 | Fuji Photo Film Co., Ltd. | Rear projection screens |
US4076384A (en) * | 1975-05-02 | 1978-02-28 | Agfa-Gevaert, A.G. | Rear-projection viewing screen |
US4268118A (en) * | 1979-09-05 | 1981-05-19 | Minnesota Mining And Manufacturing Company | Sheeting useful as a projection screen |
US4418986A (en) * | 1981-04-07 | 1983-12-06 | Mitsubishi Rayon Co., Ltd. | Rear projection screen |
US4523849A (en) * | 1982-02-11 | 1985-06-18 | The United States Of America As Represented By The United States Department Of Energy | Front lighted optical tooling method and apparatus |
US4490010A (en) * | 1982-06-10 | 1984-12-25 | Dai Nippon Insatsu Kabushiki Kaisha | Rear projection screen |
US4666248A (en) * | 1985-12-20 | 1987-05-19 | U. S. Philips Corporation | Rear-projection screen |
US4799137A (en) * | 1987-03-24 | 1989-01-17 | Minnesota Mining And Manufacturing Company | Reflective film |
US4874228A (en) * | 1987-03-24 | 1989-10-17 | Minnesota Mining And Manufacturing Company | Back-lit display |
US4773731A (en) * | 1987-08-28 | 1988-09-27 | North American Philips Corp. | One-piece projection screen |
US4969732A (en) * | 1988-02-25 | 1990-11-13 | Thorn Emi Plc | Display device |
US4982214A (en) * | 1988-05-07 | 1991-01-01 | Canon Kabushiki Kaisha | Focusing screen |
US4961642A (en) * | 1988-07-18 | 1990-10-09 | Hitachi, Ltd. | Projection type display device for monitoring at short distance |
US5054885A (en) * | 1988-10-11 | 1991-10-08 | Minnesota Mining And Manfuacturing Company | Light fixture including a partially collimated beam of light and reflective prisms having peaks lying on a curved surface |
US5612820A (en) * | 1989-06-20 | 1997-03-18 | The Dow Chemical Company | Birefringent interference polarizer |
US5122906A (en) * | 1989-06-20 | 1992-06-16 | The Dow Chemical Company | Thick/very thin multilayer reflective polymeric body |
US5122905A (en) * | 1989-06-20 | 1992-06-16 | The Dow Chemical Company | Relective polymeric body |
US5486949A (en) * | 1989-06-20 | 1996-01-23 | The Dow Chemical Company | Birefringent interference polarizer |
US5193015A (en) * | 1989-10-05 | 1993-03-09 | Thorn Emi Plc | Cholesteric liquid crystal screen which reflects substantially all of the projected light |
US5223869A (en) * | 1990-02-20 | 1993-06-29 | Canon Kabushiki Kaisha | Projector |
US5644431A (en) * | 1990-05-18 | 1997-07-01 | University Of Arkansas, N.A. | Directional image transmission sheet and method of making same |
US5442482A (en) * | 1990-05-21 | 1995-08-15 | Johnson; William N. H. | Microlens screens, photopolymerisable materials and artifacts utilising the same |
US5682080A (en) * | 1990-10-25 | 1997-10-28 | Fusion Lighting, Inc. | Method and apparatus for igniting electrodeless lamp discharge |
US5606220A (en) * | 1990-10-25 | 1997-02-25 | Fusion Systems Corporation | Visible lamp including selenium or sulfur |
US5404076A (en) * | 1990-10-25 | 1995-04-04 | Fusion Systems Corporation | Lamp including sulfur |
US5670842A (en) * | 1990-10-25 | 1997-09-23 | Fusion Lighting Inc | Method and apparatus for igniting electroeless lamp discharge |
US5166824A (en) * | 1990-10-30 | 1992-11-24 | Hitachi, Ltd. | Rear projection screen and manufacturing method therefor as well as molding die for shaping rear projection screen, overhead projector and projection television set |
US5190370A (en) * | 1991-08-21 | 1993-03-02 | Minnesota Mining And Manufacturing Company | High aspect ratio lighting element |
US5504391A (en) * | 1992-01-29 | 1996-04-02 | Fusion Systems Corporation | Excimer lamp with high pressure fill |
US5686793A (en) * | 1992-01-29 | 1997-11-11 | Fusion Uv Systems, Inc. | Excimer lamp with high pressure fill |
US5692820A (en) * | 1992-02-20 | 1997-12-02 | Kopin Corporation | Projection monitor |
US5467154A (en) * | 1992-02-20 | 1995-11-14 | Kopin Corporation | Projection monitor |
US5337179A (en) * | 1992-07-27 | 1994-08-09 | Hodges Marvin P | Flexible controllable optical surface and method of making the same |
US5496668A (en) * | 1992-12-22 | 1996-03-05 | Wisconsin Alumni Research Foundation | Formation of microstructures using a preformed photoresist sheet |
US5615045A (en) * | 1992-12-25 | 1997-03-25 | Sony Corporation | Screen of projection display |
US5333072A (en) * | 1992-12-31 | 1994-07-26 | Minnesota Mining And Manufacturing Company | Reflective liquid crystal display overhead projection system using a reflective linear polarizer and a fresnel lens |
US5453859A (en) * | 1993-06-03 | 1995-09-26 | Matsushita Electric Industrial Co., Ltd. | Polarization beam splitter and projection display apparatus |
US5337106A (en) * | 1993-06-09 | 1994-08-09 | Kowa Company, Ltd. | Liquid-crystal image director for single-lens-reflex camera |
US5695895A (en) * | 1993-06-15 | 1997-12-09 | Nashua Corporation | Randomised mask for a diffusing screen |
US5563738A (en) * | 1993-09-03 | 1996-10-08 | Jenmar Visual Systems | Light transmitting and dispersing filter having low reflectance |
US5381309A (en) * | 1993-09-30 | 1995-01-10 | Honeywell Inc. | Backlit display with enhanced viewing properties |
US5573324A (en) * | 1993-12-10 | 1996-11-12 | U.S. Philips Corporation | Image projection system |
US5694246A (en) * | 1994-01-03 | 1997-12-02 | Omron Corporation | Method of manufacturing lens array |
US5557343A (en) * | 1994-01-28 | 1996-09-17 | Matsushita Electric Industrial, Co., Ltd. | Optical system including a reflecting polarizer for a rear projection picture display apparatus |
US5933276A (en) * | 1994-04-13 | 1999-08-03 | Board Of Trustees, University Of Arkansas, N.A. | Aberration-free directional image window sheet |
US5512219A (en) * | 1994-06-03 | 1996-04-30 | Reflexite Corporation | Method of casting a microstructure sheet having an array of prism elements using a reusable polycarbonate mold |
US5801794A (en) * | 1994-07-08 | 1998-09-01 | Thomson-Csf | Color display device in which the area of a spherical lens equals the area of a set of RGB sub-pixels |
US5657408A (en) * | 1994-12-23 | 1997-08-12 | Alliedsignal Inc. | Optical device comprising a plurality of units having at least two geometrically-differentiated tapered optical waveguides therein |
US5642226A (en) * | 1995-01-18 | 1997-06-24 | Rosenthal; Bruce A. | Lenticular optical system |
US5626800A (en) * | 1995-02-03 | 1997-05-06 | Minnesota Mining And Manufacturing Company | Prevention of groove tip deformation in brightness enhancement film |
US5877874A (en) * | 1995-08-24 | 1999-03-02 | Terrasun L.L.C. | Device for concentrating optical radiation |
US5870224A (en) * | 1995-10-25 | 1999-02-09 | Toppan Printing Company Limited | Lenticular sheet, rear-projection screen or TV using the same, and fabrication method for said lenticular sheet |
US5661531A (en) * | 1996-01-29 | 1997-08-26 | Rainbow Displays Inc. | Tiled, flat-panel display having invisible seams |
US6469820B1 (en) * | 1996-02-28 | 2002-10-22 | Minolta Co., Ltd. | Scanning optical system |
US5877893A (en) * | 1996-03-30 | 1999-03-02 | Samsung Electronics Co., Ltd. | Holographic screen having light absorbers for absorbing ambient light |
US6128054A (en) * | 1996-09-06 | 2000-10-03 | Central Research Laboratories Limited | Apparatus for displaying an image |
US6353500B1 (en) * | 1996-11-07 | 2002-03-05 | Franck Guigan | Static screen for animated images |
US5932342A (en) * | 1996-11-14 | 1999-08-03 | Nashua Corporation | Optical diffusers obtained by fluid phase mixing of incompatible materials |
US5796499A (en) * | 1997-02-28 | 1998-08-18 | Polaroid Corporation | Transmission holographic diffuser made and used to effect lateral color constancy in rear screen projection display systems |
US6185038B1 (en) * | 1997-09-26 | 2001-02-06 | Matsushita Electric Industrial Co., Ltd. | Rear projection screen with light diffusion sheet and projector using same |
US6597502B2 (en) * | 1998-02-23 | 2003-07-22 | Dai Nippon Printing Co., Ltd. | Rear projection screen with uniformity of luminance |
US6410213B1 (en) * | 1998-06-09 | 2002-06-25 | Corning Incorporated | Method for making optical microstructures having profile heights exceeding fifteen microns |
US6590605B1 (en) * | 1998-10-14 | 2003-07-08 | Dimension Technologies, Inc. | Autostereoscopic display |
US6335828B1 (en) * | 1998-10-26 | 2002-01-01 | Kabushiki Kaisha Toshiba | Micro-lens array sheet |
US6503384B1 (en) * | 1999-04-01 | 2003-01-07 | Canon Kabushiki Kaisha | Microstructure array, and methods of fabricating a microstructure array, a mold for forming a microstructure array, and a microlens array |
US6278546B1 (en) * | 1999-04-01 | 2001-08-21 | Honeywell International Inc. | Display screen and method of manufacture therefor |
US6317263B1 (en) * | 1999-06-18 | 2001-11-13 | 3M Innovative Properties Company | Projection screen using dispersing lens array for asymmetric viewing angle |
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