Abstract: A rear projection display is provided which can clearly display a display screen and enable positive recognition of acceptance of operation of a power switch while preventing increases in manufacturing costs and size of the display. A liquid crystal light valve modulates light emitted from a light source lamp to light for displaying a displayed on a screen. An auxiliary lamp higher in a rate of increase in luminance at start of illumination than the source lamp is arranged such that light from the auxiliary lamp can reach a rear surface side of the screen without passing through the liquid crystal light valve. A main control section causes the light source lamp and the auxiliary lamp to both illuminate at power on, and the auxiliary lamp to extinguish before luminance of the source lamp becomes high enough to cause the display screen to be displayed by projection.

Abstract: Projection lenses for use with pixelized panels (PP) are provided. The projection lenses have a negative first unit (U1) separated from a positive second unit (U2) by a reflective surface (RS) which folds the lens' optical axis. The lenses are telecentric on the short conjugate side, have a large field of view in the direction of the long conjugate, and have low aberration levels, including, in particular, low levels of lateral color.

Abstract: A method and apparatus for producing an apparent increase in display brightness in an RPTV engine without an actual increase in total light output. Light is generated with an illumination source and optically processed to produce a light beam of rectangular format. The light beam is formed intentionally to have an intensity that is non-uniform, varying from a peak intensity at a center of the beam to a minimum intensity at a periphery of the beam. The optical processing step can include varying the intensity to selectively produce an illumination profile that decreases by at least about 30% to 70% from the peak intensity to the minimum intensity. The optical processing step can further include projecting the light beam through an integrator that is configured to produce an illumination profile that is at least partially controlled by a length of the integrator. The integrator can be configured so that a decrease in length will result in reduced uniformity.

Abstract: An image display system includes transmission means 10 provided with a light emitting body 11 for emitting light, a parabolic mirror 12 for reflecting the light emitted out of the light emitting body 11 and for emitting the light as substantially-parallel light, a converging lens 13 for converging the parallel light from the parabolic mirror 12, and a light valve 14 for providing image information to the light converged by the converging lens 13 and for emitting the light, projective optical means 20 provided with a refractive optical lens 21 for projecting the light from the transmission means 10 and a convex mirror 22 for reflecting the light from the refractive optical lens 21 by using a reflecting surface thereof having negative power and for enlarging and projecting the reflected light, and display means 30 for receiving the light from the projective optical means 20 by way of a receiving surface 30A thereof and for displaying an image based on the image information on an image display screen 30B thereof

Abstract: An image display device comprises an optical imaging arrangement for providing image information to illumination light and for transmitting the light as an optical image signal; a display for receiving the optical image signal and for displaying an image based on the image information; and a projecting optical arrangement including a reflecting part having a reflecting surface for reflecting the optical image signal, and a refracting optical part having a refracting surface for projecting the optical image signal onto the reflecting part. At least one of the reflecting surface and the refracting surface is aspherical.

Abstract: A light-source unit is disposed such that illumination light is horizontally emitted relative to an oblong screen. Three liquid-crystal display panels respectively have a liquid-crystal display surface of a rectangle. The display panels are disposed in a lengthwise posture and in a state that longer sides of the display surfaces are parallel with each other. At the same time, all the longer sides are perpendicular to a reference plane. A projection optical system is provided with a reflex mirror for perpendicularly bending an optical path. A rotation optical system for rotating projection light by 90 degrees is constituted of the reflex mirror and a plane mirror disposed behind the screen.

Abstract: A communication system for allowing a user (1) located in an observation zone to communicate with a person using a remote system at a remote location is provided. The communication system comprises a projector (6), a front projection screen (7), a two-way mirror (2), and a camera (3). The projector (6) is adapted to output a projected image along an image beam path. The front projection screen (7) has a downward-facing projection surface located in a plane above the projector (6). The image beam path impinges upon and illuminates the downward-facing projection surface of the screen (7) during use of the system. The two-way mirror (2) is located adjacent to and at an angle relative to the projection surface such that when the projected image is displayed on the projection surface, the projected image is reflected to the observation zone. The camera (3) is located behind the two-way mirror (2), such that the two-way mirror (2) is located between the camera (3) and the observation zone.

Abstract: A projection television set having an enclosure housing a screen, an optical unit and a mirror, wherein the optical unit and mirror are capable of projecting an image onto the screen. The enclosure is preferably constructed from hollow plastic extruded panels. In addition, the enclosure preferably includes a duct extending upwardly from a lower portion of the enclosure to exhaust heat radiating from components housed therein to the exterior of the enclosure toward the top of the enclosure.

Abstract: An adjusting apparatus comprises a base, and a supporting frame, a fixed plate, a sliding stand, and a carrier, which are sequential stacked on the base. An optical engine is fixed on the carrier. By rotating the adjusting device, the axis position of optical engine can be adjusted along sliding slots guided by bulges. By using arc surfaces of the sliding stand and the carrier, the adjusting apparatus clips and pushes the blocks of the carrier to adjust the left and right angle of inclination of optical engine. Therefore, the light beam provided by optical engine could project on a screen precisely and reach the optimum projection performance.

Abstract: A real image projection system includes at least one curved reflector, positioned in a tilted configuration, wherein an optical axis of the reflector is not coincident with a viewing axis, and a beampath between a target source and the curved reflector neither passes through nor reflects off of a beamsplitter.

Abstract: The present invention comprises a carrier, an optical engine disposed on the carrier, and a hood member coupled to the carrier at the front end of the optical engine. The hood member has an inlet coupled to the optical engine and an outlet sealed with a screen. At least one mirror is placed in an optical path between the optical engine and the screen for reflecting a beam from the optical engine, and is disposed with an adjusting bolt at its backside for adjusting. The hood member wraps the optical path from the optical engine to the screen for keeping the optical engine outside and preventing the external dust, moisture, and temperature.

Abstract: A refracting optical lens 15 is provided to project light from transmitting means onto a convex mirror 16 to correct for pincushion distortion of the convex mirror 16.

Abstract: A projection optical system having a plurality of reflecting surfaces is disclosed in which a sufficiently large angle is provided between an incident side reference axis and an emerging side reference axis while tilt angles of the respective reflecting surfaces can remain small. The projection optical system projects luminous flux from an image forming element which forms an original image onto a projection surface. The incident side reference axis and the emerging side reference axis of the projection optical system are oblique to each other. The projection optical system has a plurality of reflecting surfaces each having a curvature. The reflecting surfaces are arranged such that the reference axis has at least one intersection in the projection optical system.

Abstract: A rear-projection screen 3, including at least a lenticular lens sheet 32 and a Fresnel lens sheet 31, is configured so that the lenticular lens sheet 32 contains, in a base material thereof made of a resin, light diffusing microparticles made of a resin having a refractive index different from a refractive index of the base material, and the light diffusing microparticles satisfy 0.5 &mgr;m≦&Dgr;N1×d1≦0.9 &mgr;m, where &Dgr;N1 represents a difference between a refractive index of the light diffusing microparticles and a refractive index of the base material of the lenticular lens sheet, and d1 represents an average particle diameter of the light diffusing microparticles. With this, a rear-projection screen with small wavelength dependency of diffusion characteristics can be provided utilizing only resins with general properties.

Abstract: A refracting optical lens 15 is provided to project light from transmitting means onto a convex mirror 16 to correct for pincushion distortion of the convex mirror 16.

Abstract: An intake opening (132L) is formed on a left lateral side (132) of a lower cabinet (13) and an exhaust opening (132R) is formed on a right lateral side (132) in a rear projector (1), where a cooling air introduced from the intake opening (132L) by a plurality of fans provided in the lower cabinet (13) flows along a front side of a screen to cool the interior of the projector to be finally discharged from the exhaust opening (132R), so that the air after cooling the interior which is discharged by the exhaust opening (132R) is prevented from entering into the intake opening (132L), thereby always introducing fresh cooling air to cool the interior efficiently.

Abstract: A rear projector (1) has a closed space (530) including an inside of an upper cabinet (12) and an electric optical device (44), where the electric optical device (44), a sirocco fan (541) located below the electric optical device (44), a duct (542) covering the upper side of the electric optical device (44) and a heat sink (543) attached to the upper cabinet (12) are disposed and an upper cabinet cooling system (600) that cools the interior of the closed space (530) in a circulative manner is provided in the closed space (530), thereby preventing invasion of duct etc. and providing high-quality image.

Abstract: An optical engine (15) for an SLM-type display system, which may be either a front or rear projection system (10, 20). The optical engine (15) provides for a high contrast, telecentric illumination angle to the SLM (33) without compromising brightness by vignetting due to offset in the pupil. The resulting offset pupil is converted to a telecentric, on-axis image by a relay path (34) between the SLM (33) and the projection lens (37). The relay path (34) places the image at an intermediate image plane accessible by a the projection lens (37), which permits the projection lens (37) to be telecentric without an offset pupil.

Abstract: In a rear projector for projecting an image from behind a screen, its screen size is variable. In order to permit flexible adaptation to the variation in the screen size, the projector is constructed to permit easy adjustment of a detection device for detecting an image display position or a position indicated on the screen.

Abstract: An “extra-folded” projection display system includes a selectively reflective material (e.g., a linear reflecting polarizer) placed immediately behind the system's imaging screen. The display system includes an image projector that projects an image beam containing light of a predetermined linear polarization toward the imaging screen. The linear reflecting polarizer reflects the light in the image beam away from the screen. The reflected image beam then encounters a ¼-wavelength achromatic retarder which converts the linear polarization to circular polarization. The image beam next hits a mirror that reflects the light back through the ¼-wavelength achromatic retarder, which converts the circular polarization back to linear polarization, with the polarization director rotated 90° from the original polarization director. The linear reflecting polarizer then allows the light to pass through to the image screen.

Abstract: A screen is arranged substantially in parallel with a yz-plane. A first mirror is placed with its reflection plane substantially perpendicular to the yz-plane and also inclined approximately 45° to an xy-plane. At least an electro-optical device, color combining means, and projection lens are arranged along the xy-plane so that an image-light ray emitted from a color-combining optical system enters the first mirror with its optical-axis parallel to the xy plane and inclined &agr;° with respect to a y-axis. A second mirror is placed substantially perpendicularly to an XZ-plane and also with an inclination of smaller by &agr;/2° than 45° approximately with respect to the yz-plane, so that the image-light ray reflected from the first mirror is reflected by the second mirror again so as to enter the screen with the optical axis being incident on the substantial center of the screen and substantially perpendicular to the screen.

Abstract: A system for mounting an infrared (IR) remote control receiver in a rear projection television apparatus features a mirror having a coating wherein visible light is reflected to a viewing device, and light in the infrared regions is passed through the mirror and detected by an IR receiver mounted behind the mirror.

Abstract: A projection television set having an enclosure housing a screen, an optical unit and a mirror, wherein the optical unit and mirror are capable of projecting an image onto the screen. The enclosure is preferably constructed from hollow plastic extruded panels. In addition, the enclosure preferably includes a duct extending upwardly from a lower portion of the enclosure to exhaust heat radiating from components housed therein to the exterior of the enclosure toward the top of the enclosure.

Abstract: A rear projection display system is provided. The display system includes an image source for projecting an image, a rear reflector, and a screen configured to display the projected image. The screen includes a plurality of angularly discriminating reflective elements configured to reflect light incident on the screen from a first angle toward the rear reflector, and to allow light incident on the screen from a second angle to be transmitted through the screen for display.

Abstract: The present invention relates to a projection display device, and more particularly to a projection display device that is more compactly composed as compared with a conventional device by reducing the total width of a device, that is, the length between the rear of outer case and screen.

Abstract: A projection apparatus including an optical unit for magnifying and projecting an image by using light of a light source and a reflecting member for reflecting the projected image from the optical unit. This projected image is reflected by the reflecting member onto a rear surface of a screen. The projection apparatus further includes a housing containing the light source and which has a plurality of housing surfaces and an air exhausting member for discharging interior heat of the housing with the air exhausting member including an air passage. First and second aperture sections are provided on different housing surfaces from each other for exhausting air from the housing. These first and second aperture sections communicate with the same air passage but are respectively exhausting air from the same air passage in generally perpendicular air path directions.

Abstract: Optical apparatus includes a source light a reflector having a reflecting face on one side facing the source of light to receive light therefrom, a small interruption in the reflecting face, and a sampling device located on the opposite side of the reflector aligned with the small interruption for extracting a sample of the light received by the reflecting face.

Abstract: An overhead projector mounting system is provided that is configured to support a projector in a ceiling of a room. The system includes a housing having an opening through which an image generated by the projector is transmitted. Preferably, the system includes a mirror to reflect the image generated by the projector toward a viewing surface in the room.

Abstract: The invention relates to a device for the virtual production of an image, with a housing, an image projection device, which produces an image to be displayed. The housing has an observation opening in a wall of the housing with a fresnel lens arranged therein. Imaging optics arranged in the housing for depicting the object onto the fresnel lens. In order to ensure a large range of applications for this device, provision is made that the imaging optics have a concave mirror arranged in the path of light rays between the image projection device and the fresnel lens. The concave mirror lies opposite the fresnel lens and a ray divider is provided therebetween. To increase the illusion effect, a partially translucent mirror (spy mirror) is additionally arranged on the observation side of the fresnel lens.

Abstract: An “extra-folded” projection display system includes a selectively reflective material (e.g., a linear reflecting polarizer) placed immediately behind the system's imaging screen. The display system includes an image projector that projects an image beam containing light of a predetermined linear polarization toward the imaging screen. The linear reflecting polarizer reflects the light in the image beam away from the screen. The reflected image beam then encounters a ¼-wavelength achromatic retarder which converts the linear polarization to circular polarization. The image beam next hits a mirror that reflects the light back through the ¼-wavelength achromatic retarder, which converts the circular polarization back to linear polarization, with the polarization director rotated 90° from the original polarization director. The linear reflecting polarizer then allows the light to pass through to the image screen.

Abstract: A projection system includes a projector for emitting a light beam; a screen and a first medium for converting a linear polarized form of the light beam from the projector to a quasi-circular polarized form of the light beam polarized in a first circular sense. The projector also includes a mirror for reflecting and phase shifting a quasi-circular polarized form of the light beam to a circular polarized sense substantially opposite of that exhibited by the light beam before being reflected by the mirror, and a second medium optically disposed between the mirror and the screen and for selectively converting the light beam between linear polarization and quasi-circular polarization.

Abstract: Projection lenses and projection lens systems are telecentric between an illumination subsystem and a set of imagers. The lenses and systems can exhibit color fringing correction, uniform imager illumination, athermalization, and component articulation for improved imaging. The lenses and systems may be employed in display apparatuses, such as folded display apparatuses that have decreased footprint size, but long effective projection lengths.

Abstract: An LCD projection display (120) houses a projection module (10) in which light propagates through an LCD module (38) at a shallow angle (62) that improves the contrast ration of and intentionally Keystones the image bearing light. The Keystoned light is reflected by a fold mirror (64) that is mounted at a 52° upward angle, which introduces more intentional Keystoning. A projection lens (16) is mounted coaxial to a tilted optical axis (12), but the Keystoned image bearing light is refracted about 10° off the optical axis and follows a Keystoning axis (70) through the projection lens. The light propagating from the projection lens is reflected by a main fold mirror (122) that is mounted at a 57° angle from the vertical to project the image bearing light onto a 10° slanted projection screen (98).

Abstract: There is provided a reflecting mirror for use in a rear projection display and so on, comprising a glass substrate at least one surface of which is polished to have a predetermined surface waviness (0.05 &mgr;m or less on the measurement condition that the cut-off value is 0.8 mm to 8 mm), and a reflecting film which is formed on the polished surface of the glass substrate by film-forming in order of aluminum (Al), magnesium fluoride (MgF2) and titanium dioxide (TiO2). As a result, it is possible to obtain a reflecting mirror wherein any pattern of light and shade in an image projected on a screen which occurs due to the difference in light intensity resultant from irregularities in the mirror are prevented, and thereby the image quality can be improved.

Abstract: In a rear projector with a housing on whose front side is arranged a screen for displaying a video picture, with a brightness-modulated and color-modulated R-G-B light source for emitting a light bundle, with a deflecting device for scanning this light bundle, wherein the light bundle is deflected by the deflecting device over a total angle &agr; with respect to vertical scanning, and with a deflecting mirror which is located in the housing and arranged at an angle &dgr;, wherein the light bundle exiting from a real or virtual vertex of the total deflection angle &agr; is deflected onto the screen by the deflecting mirror, the virtual or real vertex located in front of the deflecting mirror lies at a location where the smallest angle &bgr; of the light bundle to the surface of the screen during deflection is less than 20° and the angle &dgr; is given by δ ≤ 45 ⁢ ° - α 4 + β

Abstract: Projection lenses and projection lens systems are telecentric between an illumination subsystem and a set of imagers. The lenses and systems can exhibit color fringing correction, uniform imager illumination, athermalization, and component articulation for improved imaging. The lenses and systems may be employed in display apparatuses, such as folded display apparatuses that have decreased footprint size, but long effective projection lengths.

Abstract: An “extra-folded” projection display system includes a selectively reflective material (e.g., a linear reflecting polarizer) placed immediately behind the system's imaging screen. The display system includes an image projector that projects an image beam containing light of a predetermined linear polarization toward the imaging screen. The linear reflecting polarizer reflects the light in the image beam away from the screen. The reflected image beam then encounters a ¼-wavelength achromatic retarder which converts the linear polarization to circular polarization. The image beam next hits a mirror that reflects the light back through the ¼-wavelength achromatic retarder, which converts the circular polarization back to linear polarization, with the polarization director rotated 90° from the original polarization director. The linear reflecting polarizer then allows the light to pass through to the image screen.

Abstract: A projection-type display device of the present invention includes a projection unit for projecting an image to be displayed on a screen and an angle-of-projection correcting mechanism supporting the projection unit. The angle-of-projection correcting mechanism is located at a side surface of the projection unit, instead of on a bottom surface thereof, to correct the projection angle of the image projected from the projection unit onto the screen, while reducing the size of the projection-type display device.

Abstract: A projection beam supplied by a projector is incident on a beam splitter in the form of a cholesteric filter. The cholesteric filter reflects circularly polarized radiation having a wavelength which corresponds to the pitch of the molecular helix and having a direction of rotation which corresponds to the direction of the molecular helix to a reflector. The circular direction of polarization reflected by the cholesteric filter is inverted on the reflector so that the beam is subsequently passed to the screen by the cholesteric filter.

Abstract: A back projection device comprises an image generator (GI), an onward reflection mirror (MR) and at least one optical component (OM) capable of reflecting certain types of light beams almost entirely and reflecting certain other types of light beams almost entirely, said component being located in the proximity of a screen (E). The selection of optical behavior of the component (OM) may be done as a function of the polarization of the light beam, or else also as a function of its orientation with respect to said component (OM). Application: displays.

Abstract: An imaging optical system transmits a primary image. The optical system does not form an intermediate image. The primary image is projected on a screen as a secondary image. The optical system has a projection optical system and a reflection optical system. An optical axis of the reflection optical system forms an angle other than 90.degree. with respect to a screen-side image surface.

Abstract: A rear projection monitor having a housing with reduced depth is disclosed. Images produced by liquid crystal active matrices are illuminated by a light source. The images are enlarged and projected by a projection lens having a large rear focus. A mirror reflects the projected images onto a viewing screen. The mirror is positioned between 36.degree. and 45.degree. in relation to the viewing screen. The back of the housing is adjacent to and slopes at the same angle as the mirror. The depth of the projection monitor is between 33% to 41% of the diameter of the viewing screen.

Abstract: A retro-focus type lens is provided from a large conjugate side with a first lens group having a negative refracting power, a second lens group having a positive refracting power which is spaced away from the first lens group at an air interval D1, and a third lens group having a positive refracting power. The following conditions are satisfied when focal lengths of the first lens group, the second lens group, the third lens group, and a total lens system are assumed respectively as f1, f2, f3, and f:1.8<D1/f<3.01.1<f2/f3<1.61.5<.vertline.f1.vertline./f<2.3.A projection lens constructed by inserting a mirror in a lens system of thus constructed retro-focus type lens is used in a projection-type display apparatus.

Abstract: A portable collapsible liquid crystal display apparatus which includes a base, and a relatively large viewing screen having a width corresponding substantially to the overall width of said base and which, together with a first planar member of the same size, are pivotally mounted on the base. When the apparatus is in its viewing mode, the screen is turned to an upright position on the base with the mirror in an inclined position extending downwardly behind the screen to reflect images over the entire rear surface of the screen. When the unit is in a collapsed mode, the screen is folded down over the base and the mirror is folded down on top of the screen with its reflective surface facing the screen and with its rear surface forming a protective cover for the screen. The linkage mechanism which couples the screen and mirror to the base includes relatively wide links which also serve to shield the rear surface of the screen from ambient light when the screen is in its upright viewing position.

Abstract: A transmission screen for a rear projection type image display apparatus having at least one image generation source for displaying images, at least one projection lens for enlarging and projecting images displayed on the at least one image generation source onto a rear portion of the transmission screen for display. The transmission screen of the image display apparatus enables display of the images projected onto the transmission screen with a contrast of at least 70. Further, the transmission screen enables display with a field angle within a range of at least 72.degree. to less than 100.degree.. The transmission screen also includes a glossy light absorbing layer and a substantially smooth mirror surface at a light exit surface thereof.

Abstract: A rear screen video display system includes a panel assembly having a front panel for supporting a screen, a base panel attachable to the front panel, and two side panels pivotally attached to the front panel, the system further includes a housing structure supported on the base panel for housing a projector, the base panel having elements cooperating with respective elements of housing structure for releasably retaining the structure, the housing structure receiving a stand for supporting the projector in the housing.

Abstract: A compact and efficient image projection system is described. The projection beam supplied by a projector is incident on a beam splitter in the form of a cholesteric filter. The cholesteric filter reflects circularly polarized radiation having a wavelength which corresponds to the pitch of the molecular helix and having a direction of rotation which corresponds to the direction of the molecular helix to a reflector. The circular direction of polarization reflected by the cholesteric filter is inverted on the reflector so that the beam is subsequently passed to the screen by the cholesteric filter.

Abstract: A rear projection display apparatus for displaying an image reduces parallax error. The display apparatus includes a housing, a transparent screen support having top and bottom surfaces, a translucent display screen removably adhereable to the top surface of the screen support, and a projector to project the image onto the display screen. Optionally, a series of mirrors may be provided to sequentially reflect the image from the projector onto the display screen. In a preferred embodiment, the housing is pivotally mounted on a base, and houses the display screen, screen support, mirrors and projector.

Abstract: In a projection screen for a rear projection type television set, three lens sheets are arranged in the order of a lenticular lens sheet, a linear Fresnel lens sheet, and a circular Fresnel lens sheet when seen from a viewer's side toward a projector tube. As compared with the arrangement in which the linear and circular Fresnel lens sheets are exchanged with each other, it is possible to obtain a higher brightness and a more uniform brightness, and color uniformity in the picture plane. Further, when the light incident surface of the linear Fresnel lens sheet is matted, it is possible to eliminate white bands (seen from the viewer's side) effectively.

Abstract: A projector comprising liquid crystal display panels and a projection lens for projecting the modulated light to a screen. A back surface reflection mirror including a transparent plastic sheet and a reflecting film is arranged between the projection lens and the screen. The mirror is thin and light and may have optical anisotropy. In order to eliminate an uneven pattern appearing in the screen caused by optical isotropy of the mirror and the difference between the light distribution characteristics in the screen for P- and S-polarized light, the projection lens and the back surface reflection mirror are arranged in such a relationship that a wave normal vector of an arbitrary component of the light projected by the projection lens and made incident to the back surface reflection mirror is not parallel to the optical axis of the plastic sheet.