US20050122484A1 - Projection display device with a projection module - Google Patents

Projection display device with a projection module Download PDF

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Publication number
US20050122484A1
US20050122484A1 US11/003,278 US327804A US2005122484A1 US 20050122484 A1 US20050122484 A1 US 20050122484A1 US 327804 A US327804 A US 327804A US 2005122484 A1 US2005122484 A1 US 2005122484A1
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United States
Prior art keywords
projection
lens group
projection module
lens
docking station
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Abandoned
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US11/003,278
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English (en)
Inventor
Ernesto Rodriguez
Patricia Hughes
William Haushalter
Kai Lu
Steven Saxe
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3M Innovative Properties Co
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3M Innovative Properties Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 3M Innovative Properties Co filed Critical 3M Innovative Properties Co
Priority to US11/003,278 priority Critical patent/US20050122484A1/en
Assigned to 3M INNOVATIVE PROPERTIES COMPANY reassignment 3M INNOVATIVE PROPERTIES COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAXE, STEVEN G., HAUSHALTER, WILLIAM E., HUGHES, PATRICIA M., RODRIGUEZ, ERNESTO M.
Assigned to 3M INNOVATIVE PROPERTIES COMPANY reassignment 3M INNOVATIVE PROPERTIES COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LU, KAI CHANG
Publication of US20050122484A1 publication Critical patent/US20050122484A1/en
Priority to US12/021,877 priority patent/US7850311B2/en
Abandoned legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/22—Telecentric objectives or lens systems
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/10—Projectors with built-in or built-on screen
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/30—Details adapted to collapse or fold, e.g. for portability
    • 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
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B5/04—Vertical adjustment of lens; Rising fronts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof

Definitions

  • the present invention relates to a front projection display device.
  • the front projection display device can be utilized in short throw distance applications.
  • the present invention relates to a front projection display device that can be docked into a station and that produces an image with substantially no distortion and that requires little to no keystone correction.
  • the front projection display device can include an extendable arm. Further, the front projection display device can be docked in a mobile media station.
  • Electronic or video display systems are devices capable of presenting video or electronic generated images. Whether used in home entertainment, advertising, videoconferences or group conferences, the demand exists for an appropriate display device.
  • Image quality is one of the factors consumers use to determine the appropriate display device. In general, image quality can be determined qualitatively by factors such as image resolution and image color. As the desire by some consumers is for display devices having larger picture size, image quality can suffer. Typically, a large picture size is one that exceeds about 40 inch screen size as measured along the diagonal of the screen.
  • the present invention pertains to a front projection display device comprising a projection module and a docking station.
  • the projection module comprises an optical engine.
  • the optical engine includes an illumination system, an imaging system, and a wide-angle projection lens.
  • the optical engine outputs an image at a half field angle of at least 45°.
  • the image has substantially no distortion and requires substantially no keystone correction.
  • the docking station can comprise a base and an extendable arm attached to the base.
  • a mobile media station can include a cart, a screen attachable to the cart, and a projection display device disposed on the cart to provide an image to the screen.
  • the projection display device includes a projection module having an optical engine, such as described above, and a docking station.
  • the front projection display device and projection module of the present invention can be used in a short throw distance, extreme off-axis application.
  • the term “throw distance” means the distance defined by the normal from the projection screen to the projection lens.
  • the phrase “short throw distance” means a distance of less than one meter.
  • the term “extreme off-axis” means the projected image subtends an angle of greater than 45 degrees.
  • FIG. 1 is a schematic view of an exemplary front projection display device of the present invention in a storage position
  • FIG. 2 is a schematic view of the device of FIG. 1 in a use position
  • FIG. 3 is a schematic view of the device of FIG. 1 in a projection mode
  • FIGS. 4, 4A , 4 B, and 4 C are schematic views of various portions of another exemplary embodiment of a docking station of the present invention.
  • FIG. 5 is a schematic representation the front projection display device used in an office setting
  • FIG. 6 is schematic view of the projection module equipped with an exemplary expansion module
  • FIG. 7A is a schematic representation of an exemplary wide-angle projection lens that can be used in the present invention.
  • FIG. 7B is a schematic representation of an exemplary wide-angle projection lens that can be used in the present invention.
  • FIG. 8 shows a schematic view of a mobile media station according to another embodiment of the invention.
  • FIG. 9 shows a user attaching an exemplary projection module to a docking station
  • FIG. 10 shows another view of the mobile media station of FIG. 8 ;
  • FIG. 11 shows an exemplary projection module and docking station according to another embodiment of the present invention.
  • FIG. 12 shows the exemplary projection module of FIG. 11 docked in a docking station
  • FIG. 13 shows an exemplary projection module being docked in a ceiling mounted docking station according to another embodiment of the present invention.
  • FIG. 1 shows an exemplary front projection display device 300 in a storage position.
  • FIG. 2 is a schematic view of device 300 in a use position.
  • the front projection display device has projection module 100 and a docking station 301 .
  • the projection module includes an optical engine to project an image to a viewing screen or surface. An exemplary optical engine is described in further detail below.
  • the docking station 301 includes base 310 and extendable telescopic arms 320 .
  • the base can be permanently attached to a surface, such as a wall.
  • the projection module has a handle and manual focusing mechanism. The handle is a desirable feature as it allows for portability of the projection module.
  • FIG. 3 is a schematic view of the front projection display device of FIG. 1 in use.
  • the projection device can create an image on a projection surface 400 , such as a projection screen or, in this particular case, on a wall.
  • a computer 500 can be interfaced with the display device for presentation purposes.
  • FIG. 3 shows display device 300 positioned generally beneath the image, one skilled in the art will recognize that the device can alternatively be positioned generally above the image.
  • FIGS. 4 and 4 A show schematic views of another embodiment of a docking station that can be used in the front projection display device of the present invention.
  • docking station 600 has a base 610 , arms 630 (first arm portion) and 640 (second arm portion) connected by hinged elbow 620 , and a dock 650 located distal to the base.
  • the arms can be flexible arms, allowing for movement so that the presenter can have more flexibility in positioning the display device.
  • FIG. 4A shows that the second arm portion can be lengthened or shortened, as necessary, and can accommodate lateral movements.
  • FIG. 4B shows projection module 100 ready to be installed into dock 650 .
  • FIG. 4C shows one exemplary method of installing the projection module to the dock, in this case, by twisting the projection module into the dock.
  • FIG. 5 shows the front projection display device, using the docking station type of FIG. 4 , mounted to temporary or movable wall 700 , such as a cubicle wall.
  • the device shown in FIG. 5 can be particularly useful in a trade show setting.
  • the base of the docking station can be attached to a board, such as a white board.
  • the arms swing out so that the projection module is generally in front of the white board, just beneath or just above the white board.
  • the arms swing in so that they lie generally parallel to the surface of the board.
  • the extendable arms can be equipped with various accessories to support operation of the projection module.
  • the docking station can contain a power supply to supply power to the module, communication wires or lines to provide communication between the projection module and a computer (not shown), and connections for making a wired or a wireless network connection.
  • the wired/wireless network connection can provide, among other things, central administrative control function to allow a central office the ability to monitor use of the projection device.
  • the network connection can also provide access to infrastructure network to allow a presenter access to and display of files residing on the network.
  • the network connection could allow the presenter, in an ad hoc mode, to receive information, such as presentation graphics, from a local computer.
  • the projection module has a port containing an interface for communication with the docking station.
  • FIG. 6 shows another exemplary embodiment of the invention where projection module 100 is equipped with expansion module 150 and optional memory stick 160 .
  • the expansion module can allow for such features as wireless connection to a computer (not shown), a media player capable of running presentation software, and/or a picture player.
  • the expansion module connects with the interface in the port of the projection module.
  • the projection module containing the expansion module can be used as a stand-alone unit or be used with the docking station.
  • FIG. 8 shows yet another embodiment, an exemplary mobile media station 800 having main body 850 , handle 810 , projection screen attachment device 820 , slidable trays 830 and 840 and optionally wheels 860 for easy transport to and from various locations.
  • FIG. 10 shows that mobile media station 800 , when not in use, can easily be stored in a storage space.
  • a cart and wheels there are alternative designs to the use of a cart and wheels to make the media station mobile.
  • a front projection display device comprising projection exemplary module 100 and a docking station can be mounted to slidable tray 830 .
  • Slidable tray 840 can accommodate computer 500 , if one is used.
  • Projection screen 400 can be attached to the cart using attachment device 820 . If desired, however, the screen can be detached from the cart and the mobile media station can be placed in front of a wall, which would serve as the projection area. In use, the projection module is positioned less than one meter away from the projection area.
  • FIG. 9 further illustrates that a user can readily attach projection module 100 to a docking station 200 by using handle 110 .
  • an exemplary docking station can be equipped with various accessories to support operation of the projection module, such as a power supply, communication wires or lines, and connections for making a wired or a wireless network connection.
  • the projection module includes a port containing an interface for communication with the docking station.
  • the docking station can be permanently attached to the cart.
  • any necessary hardware such as power cords, phone lines, control lines (e.g., modem lines), and network lines (e.g., Ethernet lines), can be pre-wired and hidden from view and can at least be away from the audience.
  • FIGS. 11 and 12 show a front projection display device 300 that includes projection module 100 and an exemplary docking station 200 .
  • the projection module can include a handle 110 .
  • the projection module can include a manual focusing mechanism 120 .
  • the handle is a desirable feature as it allows for portability of the projection module.
  • FIG. 11 shows a front projection display device where projection module 100 has not been installed in docking station 200 .
  • the projection module can include a port 140 containing an interface for communication with the docking station 200 .
  • the projection module and the docking station can be equipped with speakers 130 and/or 230 , respectively.
  • the docking station can be equipped with various accessories to support operation of the projection module.
  • a network connection can also be included to provide access to an infrastructure network to allow a presenter access to and display of files residing on the network.
  • the docking station 200 can be attached to a surface, such as a tabletop or a ceiling.
  • any necessary hardware such as power cords, phone lines, control lines (e.g., modem lines), and network lines (e.g., Ethernet lines), can be pre-wired and hidden from view and can at least be away from the audience.
  • FIG. 13 shows the projection module 100 in the process of being docked to ceiling mounted docking station 900 .
  • the projection module can be detached from the docking station and can be used separately.
  • the projection module can be equipped to provide power for the module to operate, such as with electrical power cords or batteries.
  • the projection module can include an optical engine that supplies an image to a viewing screen or surface.
  • FIG. 7A shows a schematic representation of exemplary optical engine 10 that can be used in the projection module.
  • the optical engine has one or more of the following components: illumination system 12 or 12 ′, imaging system 14 , focus mechanism 15 , and projection optics 16 . While two different illumination systems 12 and 12 ′ are shown, typically only one is used. When the illumination system lies in position depicted by reference number 12 , the imager used is a reflective imager. In contrast, when the illumination system lies in position depicted by reference number 12 ′, the imager used is a transmissive imager.
  • the optical engine generates an image on projection screen 18 . Because the viewer and the optical engine are on the same side of the projection screen, FIG. 7A depicts a front projection display system using optical engine 10 . Each element in the optical engine is discussed in detail below.
  • the illumination system includes a lamp unit, a filter (such as an infrared light and/or a ultraviolet light rejection filter), a color separation means, and an integrator.
  • the lamp unit includes a reflector and a lamp.
  • Suitable, commercially available lamps include (i) Philips UHP type lamp unit, which uses an elliptic reflector, from Philips Semiconductors, Eindhoven, The Netherlands and (ii) OSRAM P-VIP 250 lamp unit from OSRAM GmBH, Kunststoff, Germany.
  • Other suitable lamps and lamp unit arrangements can be used in the present invention. For example, metal halide lamps or tungsten halogen lamps or light emitting diodes (LED's) can be used.
  • the type of filter, color wheel, and integrator that can be used in the present invention are not critical.
  • the color separation means is a spinning red/green/blue (RGB) color sequential disc in the light source of the imager.
  • RGB red/green/blue
  • An illustrative commercially available color wheel is the UNAXIS RGBW color wheel, from UNAXIS Balzers, LTD, Balzers, Liechtenstein.
  • a liquid crystal RGB color sequential shutter can also be used in the present invention.
  • An illustrative commercially available integrator is a hollow tunnel type integrator from UNAXIS Balzers LTD.
  • the imaging system includes an imager and typically also includes conventional electronics.
  • a useful reflective imager that can be used in the present invention is a XGA digital micromirror device (DMD) having a diagonal of about 22 mm, available from Texas Instruments, Dallas, Tex.
  • DMD digital micromirror device
  • a transmissive or reflective liquid crystal display can be used as the imager.
  • the surface of the imager is positioned substantially parallel to the surface of the projection screen.
  • the focusing mechanism can be accomplished by mounting one or more of the lenses described below on a slidable or threaded mount, which can be adjusted manually by a user or through the use of an electronic actuation mechanism.
  • focusing can be accomplished by using a varifocal or a zoom lens.
  • no user focus is required for projection units having a predetermined fixed position established between the optical engine and the viewing screen.
  • the screen may comprise a multi-layer material, for example, a plurality of Fresnel elements configured as is described in U.S. Pat. No. 6,179,426.
  • the screen can alternately be a digital white board, as described in U.S. Pat. No. 6,179,426.
  • the screen can be designed to control light distribution spreading in the horizontal direction to accommodate viewers who are positioned horizontally in front of the screen.
  • Alternative embodiments of the screen may comprise 3M multi-layer film, 3M's Dual Brightness Enhancement Film (DBEF) film, or 3M's VIKUITITM film.
  • the generated image can be viewed on any surface, e.g., a wall or other structure, or standard viewing screen.
  • the wide-angle projection lens of the optical engine 10 can include three lens groups in the following sequential order from a screen side: first lens group (G 1 ), second lens group (G 2 ), and third lens group (G3).
  • first lens group G 1
  • second lens group G 2
  • third lens group G3
  • the term “screen side” means that side of the projection lens closest to a projection screen.
  • the three lens groups are discussed in detail below.
  • the first lens group is of negative refractive power and is formed of a plurality of lens elements.
  • a first lens element (L 1 ) lying closest to the screen has the largest diameter of all the lenses in the three lens groups.
  • the first lens element in the first lens group has a sufficiently large diameter to project an image at a large field, i.e., at a half field angle greater than 45°, preferably greater than 50° and most preferably about 55° in the direction of the screen with substantially no distortion.
  • substantially no distortion it is meant that the distortion is no greater than 2%.
  • the distortion is less than or equal to 1%, most preferably less than or equal to 0.5%.
  • the first lens element in the first lens group has a diameter greater than 60 mm and less than 75 mm. In yet another exemplary embodiment, the first lens element of the first lens group has a diameter of 70 mm.
  • the first lens element when implemented in a projection device, can provide a field of view of about 110° to about 120°.
  • the first lens group further includes a second lens element (L 2 ) having at least one aspheric surface.
  • the aspheric surface of the present embodiment can help reduce distortion effects, while still providing a large field of view.
  • the second lens element is fabricated from an optical polymer having a refractive index of 1.49 and an Abbe number of 57.2, such as polymethyl methacrylate (PMMA).
  • the second surface of the first element of the first lens group has a radius of curvature substantially equal to the radius of curvature of the first surface of the second lens element in the first lens group.
  • the first lens group includes two meniscus shaped, nested lens elements, a first meniscus shaped element made of glass and a second meniscus shaped element made of plastic, with controlled thickness on the plastic element.
  • a plastic such as PMMA can be used.
  • the two elements are spaced apart such that the ratio of the distance between the second surface of the first element and the first surface of the second element to the overall effective focal length of the projection lens is ⁇ fraction (1/175) ⁇ .
  • the second shaped element comprises an aspheric lens (e.g., a lens having at least one aspheric surface) having a substantially uniform thickness throughout.
  • an aspheric lens e.g., a lens having at least one aspheric surface
  • This dome-shaped design can reduce thermal problems and can provide for straightforward manufacturing.
  • the first lens group can comprise two shaped elements molded together to form one integral element.
  • the first shaped element can comprise a glass element and the second shaped element can comprise a plastic (e.g., PMMA) element molded onto the second surface of the first shaped element.
  • PMMA plastic
  • the first lens group can comprise a single element (e.g., a single glass element), with an aspheric surface formed on the first surface, second surface, or both surfaces of the single element.
  • a single element e.g., a single glass element
  • the second lens group is of substantially zero refractive power.
  • the second lens group is formed of a plurality of lens element.
  • the aperture stop of the projection lens lies within or near the second lens group. For example, in one embodiment, referring to FIG. 8 , the aperture stop is provided about L 5 .
  • all lens elements in the second lens group can have spherical surfaces.
  • the second lens group is formed of a cemented triplet to help control spherical aberration and coma.
  • the on-axis spacing between the lens elements in G 1 and the lens elements in G 2 can be varied, if desired.
  • the second lens group provides a longer effective focal length.
  • the elements that make up the second lens group are formed from glass.
  • a doublet can be used for the second lens group.
  • one or both of the doublet elements can include an aspheric surface.
  • the third lens group is of positive refractive power and all lens elements in this lens group have spherical surfaces.
  • the third lens group provides color aberration correction (i.e., primary and secondary dispersion compensation).
  • lenses L 7 , L 8 , L 10 , and L 11 can comprise the same glass material, e.g., MP 52. Alternatively, other glasses may also be utilized.
  • a prism e.g., a TIR prism, not shown
  • a field lens can be utilized.
  • FIG. 7B shows one exemplary embodiment of the wide-angle projection lens having 11 optical elements comprising the three lens groups, numbered from the screen side.
  • the first lens group (G 1 ) can include a first lens element (L 1 ) of negative refractive power and a second lens element (L 2 ) having an aspheric surface on its second surface.
  • G 1 is preferably of negative refractive power.
  • the ratio of F 1 /F in G 1 is such that ⁇ 3.5 ⁇ F 1 /F ⁇ 2.3.
  • the second lens group (G 2 ) is formed of three lens elements, (L 3 ) to (L 5 ) inclusive, cemented together using a conventional adhesive.
  • G 2 is substantially zero refractive power. In one embodiment, it can be slightly positive. In another embodiment, it can be slightly negative.
  • the ratio of F 2 /F in G2 is such that ⁇ 95 ⁇ F 2 /F ⁇ 86.
  • the aperture stop lies within or near the second lens group.
  • the third lens group (G 3 ) is formed of six lens elements (L 6 ) to (L 11 ) inclusive.
  • G3 is of positive refractive power.
  • the ratio of F 3 /F in G 3 is such that 2.5 ⁇ F 3 /F ⁇ 3.2.
  • a prism can lie to the right of L 11 , i.e., furthest away from the projection screen.
  • Table 1 lists the surface number, in order from the screen side (with surface 1 being the surface closest to the screen side of the first lens element Li), the curvature (c) near the optical axis of each surface (in 1/millimeters), the on axis spacing (D) between the surfaces (in millimeters), and the glass type is also indicated.
  • surface 0 is the object surface or the surface of the projection screen.
  • the wide-angle projection lens has an effective overall focal length of 8.8 mm, a half field angle of 55° in the direction of the screen side and operates at F/2.8.
  • the first lens group G 1 has an effective focal length of ⁇ 25.4 mm; the second lens group G 2 has an effective focal length of ⁇ 800 mm; and the third lens group G 3 has an effective focal length of 23.5 mm.
  • the projection lens has a total track of 130 mm in this exemplary embodiment.
  • the wide-angle projection lens of the embodiment of FIG. 7B has a total track distance of 130 mm.
  • it can be advantageous to have a short total track distance because it would result in a compact projection lens thus minimizing the space requirements of the overall optical engine.
  • the front projection display device can provide a large image size at a short throw distance.
  • the device can be placed at a relatively short distance (e.g., 27-33 inches) from the viewing screen or surface to produce a 60 inch image size (as measured diagonally).
  • the ratio of the distance from the viewing screen to the image size (diagonal, 4 ⁇ 3 format) can be 1 to 1.8-2.2.
  • a conventional projector has a ratio of the distance from the viewing screen to the image size (diagonal, 4 ⁇ 3 format) of 1 to 0.7-0.9.
  • the terms “4 ⁇ 3 format” and “16 ⁇ 9 format” refer to conventional image formats as measured by the image width by the image height.
  • the front projection display device is placed at a distance from the screen of about 18-22 inches.
  • the front projection display device is placed at a distance from the screen of about 27-33 inches.
  • the exemplary optical engine described herein can provide an image size of greater than 60 inches (diagonal, 4 ⁇ 3 format), if necessary, using a relatively short throw distance at an extreme off-axis position.
  • the optical engine is designed so that little or no keystone correction is necessary, while distortion is reduced.
  • the optical engine can provide an image having a 4 ⁇ 3 format.
  • the optical engine can be implemented with a suitable imager to provide a different screen format, such as a 16 ⁇ 9 format.
  • the optical engine can be implemented with correction circuitry (e.g., a conventional warp chip), which can result in sufficient image quality at even shorter throw distances.
  • correction circuitry e.g., a conventional warp chip
  • a front projection display device and projection module of exemplary embodiments can have a short throw distance, where the projection display device/projection module can be placed very close (i.e., at a distance of less than about 1 meter) to the projection screen or the projection surface, such as a wall, for a full size image (i.e., an image having a size of at least 40 inches, as measured along the diagonal). Because the front projection display device/projection module is at a close distance to the screen, the likelihood of light from the device shining into the presenter's eyes while making a presentation can be reduced.
  • any noise or heat that may be generated by the device is typically at a sufficiently far distance from the audience.
  • the presenter is not required to move objects on the tabletop or provide for special seating of the audience to ensure that members of the audience are not in the device's light path.
  • the projection device described herein can be used in a smaller space for presentations, such as a small office or a small cubicle.
  • the use of the exemplary docking station can provide the benefit of a reduction in cost.
  • the cost of the projection module will typically be higher than that of the docking station.
  • An organization can have more docking stations than projection modules in its facilities.
  • the use of an exemplary handle can provide straightforward transportation of the projection module to a desired location.
  • the docking station may or may not be permanently attached to a surface, such as a wall.
  • the projection module can be installed into the dock in a straightforward manner, minimizing the setup time that may be required to attach any desired hardware, such as power cords, phone lines, and the like.
  • the docking station is not permanently attached, it, along with the projection module, are both portable. Such a portable system is particularly beneficial in settings such as a trade show.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)
  • Lenses (AREA)
  • Transforming Electric Information Into Light Information (AREA)
US11/003,278 2003-12-05 2004-12-03 Projection display device with a projection module Abandoned US20050122484A1 (en)

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Application Number Priority Date Filing Date Title
US11/003,278 US20050122484A1 (en) 2003-12-05 2004-12-03 Projection display device with a projection module
US12/021,877 US7850311B2 (en) 2003-12-05 2008-01-29 Projection display device with a projection module

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US52742403P 2003-12-05 2003-12-05
US55661204P 2004-03-26 2004-03-26
US58469204P 2004-07-01 2004-07-01
US58469304P 2004-07-01 2004-07-01
US58469104P 2004-07-01 2004-07-01
US11/003,278 US20050122484A1 (en) 2003-12-05 2004-12-03 Projection display device with a projection module

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WO2005057267A2 (en) 2005-06-23
CN1890593B (zh) 2010-05-12
AU2004297974A1 (en) 2005-06-23
NO20063075L (no) 2006-09-05
US20080137040A1 (en) 2008-06-12
TW200528757A (en) 2005-09-01
JP2007513384A (ja) 2007-05-24
MXPA06006290A (es) 2006-08-25
EP1723459A2 (en) 2006-11-22
WO2005057267A3 (en) 2005-11-24
KR20060123762A (ko) 2006-12-04
KR101233911B1 (ko) 2013-02-15
CN1890593A (zh) 2007-01-03
CA2547443A1 (en) 2005-06-23
US7850311B2 (en) 2010-12-14
KR20120026134A (ko) 2012-03-16

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